Update Linux to v5.10.109
Sourced from [1]
[1] https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.10.109.tar.xz
Change-Id: I19bca9fc6762d4e63bcf3e4cba88bbe560d9c76c
Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
diff --git a/drivers/firmware/efi/libstub/Makefile b/drivers/firmware/efi/libstub/Makefile
index 8c5b552..a2ae9c3 100644
--- a/drivers/firmware/efi/libstub/Makefile
+++ b/drivers/firmware/efi/libstub/Makefile
@@ -7,54 +7,93 @@
#
cflags-$(CONFIG_X86_32) := -march=i386
cflags-$(CONFIG_X86_64) := -mcmodel=small
-cflags-$(CONFIG_X86) += -m$(BITS) -D__KERNEL__ -O2 \
+cflags-$(CONFIG_X86) += -m$(BITS) -D__KERNEL__ \
-fPIC -fno-strict-aliasing -mno-red-zone \
-mno-mmx -mno-sse -fshort-wchar \
-Wno-pointer-sign \
$(call cc-disable-warning, address-of-packed-member) \
- $(call cc-disable-warning, gnu)
+ $(call cc-disable-warning, gnu) \
+ -fno-asynchronous-unwind-tables \
+ $(CLANG_FLAGS)
# arm64 uses the full KBUILD_CFLAGS so it's necessary to explicitly
# disable the stackleak plugin
cflags-$(CONFIG_ARM64) := $(subst $(CC_FLAGS_FTRACE),,$(KBUILD_CFLAGS)) \
- -fpie $(DISABLE_STACKLEAK_PLUGIN)
+ -fpie $(DISABLE_STACKLEAK_PLUGIN) \
+ $(call cc-option,-mbranch-protection=none)
cflags-$(CONFIG_ARM) := $(subst $(CC_FLAGS_FTRACE),,$(KBUILD_CFLAGS)) \
-fno-builtin -fpic \
$(call cc-option,-mno-single-pic-base)
+cflags-$(CONFIG_RISCV) := $(subst $(CC_FLAGS_FTRACE),,$(KBUILD_CFLAGS)) \
+ -fpic
-cflags-$(CONFIG_EFI_ARMSTUB) += -I$(srctree)/scripts/dtc/libfdt
+cflags-$(CONFIG_EFI_GENERIC_STUB) += -I$(srctree)/scripts/dtc/libfdt
-KBUILD_CFLAGS := $(cflags-y) -DDISABLE_BRANCH_PROFILING \
+KBUILD_CFLAGS := $(cflags-y) -Os -DDISABLE_BRANCH_PROFILING \
+ -include $(srctree)/include/linux/hidden.h \
-D__NO_FORTIFY \
- $(call cc-option,-ffreestanding) \
- $(call cc-option,-fno-stack-protector) \
+ -ffreestanding \
+ -fno-stack-protector \
$(call cc-option,-fno-addrsig) \
-D__DISABLE_EXPORTS
+# remove SCS flags from all objects in this directory
+KBUILD_CFLAGS := $(filter-out $(CC_FLAGS_SCS), $(KBUILD_CFLAGS))
+
GCOV_PROFILE := n
+# Sanitizer runtimes are unavailable and cannot be linked here.
KASAN_SANITIZE := n
+KCSAN_SANITIZE := n
UBSAN_SANITIZE := n
OBJECT_FILES_NON_STANDARD := y
# Prevents link failures: __sanitizer_cov_trace_pc() is not linked in.
KCOV_INSTRUMENT := n
-lib-y := efi-stub-helper.o gop.o secureboot.o tpm.o
+lib-y := efi-stub-helper.o gop.o secureboot.o tpm.o \
+ file.o mem.o random.o randomalloc.o pci.o \
+ skip_spaces.o lib-cmdline.o lib-ctype.o \
+ alignedmem.o relocate.o vsprintf.o
# include the stub's generic dependencies from lib/ when building for ARM/arm64
-arm-deps-y := fdt_rw.c fdt_ro.c fdt_wip.c fdt.c fdt_empty_tree.c fdt_sw.c
-arm-deps-$(CONFIG_ARM64) += sort.c
+efi-deps-y := fdt_rw.c fdt_ro.c fdt_wip.c fdt.c fdt_empty_tree.c fdt_sw.c
$(obj)/lib-%.o: $(srctree)/lib/%.c FORCE
$(call if_changed_rule,cc_o_c)
-lib-$(CONFIG_EFI_ARMSTUB) += arm-stub.o fdt.o string.o random.o \
- $(patsubst %.c,lib-%.o,$(arm-deps-y))
+lib-$(CONFIG_EFI_GENERIC_STUB) += efi-stub.o fdt.o string.o \
+ $(patsubst %.c,lib-%.o,$(efi-deps-y))
lib-$(CONFIG_ARM) += arm32-stub.o
lib-$(CONFIG_ARM64) += arm64-stub.o
+lib-$(CONFIG_X86) += x86-stub.o
+lib-$(CONFIG_RISCV) += riscv-stub.o
CFLAGS_arm32-stub.o := -DTEXT_OFFSET=$(TEXT_OFFSET)
-CFLAGS_arm64-stub.o := -DTEXT_OFFSET=$(TEXT_OFFSET)
+
+# Even when -mbranch-protection=none is set, Clang will generate a
+# .note.gnu.property for code-less object files (like lib/ctype.c),
+# so work around this by explicitly removing the unwanted section.
+# https://bugs.llvm.org/show_bug.cgi?id=46480
+STUBCOPY_FLAGS-y += --remove-section=.note.gnu.property
+
+#
+# For x86, bootloaders like systemd-boot or grub-efi do not zero-initialize the
+# .bss section, so the .bss section of the EFI stub needs to be included in the
+# .data section of the compressed kernel to ensure initialization. Rename the
+# .bss section here so it's easy to pick out in the linker script.
+#
+STUBCOPY_FLAGS-$(CONFIG_X86) += --rename-section .bss=.bss.efistub,load,alloc
+STUBCOPY_RELOC-$(CONFIG_X86_32) := R_386_32
+STUBCOPY_RELOC-$(CONFIG_X86_64) := R_X86_64_64
+
+#
+# ARM discards the .data section because it disallows r/w data in the
+# decompressor. So move our .data to .data.efistub and .bss to .bss.efistub,
+# which are preserved explicitly by the decompressor linker script.
+#
+STUBCOPY_FLAGS-$(CONFIG_ARM) += --rename-section .data=.data.efistub \
+ --rename-section .bss=.bss.efistub,load,alloc
+STUBCOPY_RELOC-$(CONFIG_ARM) := R_ARM_ABS
#
# arm64 puts the stub in the kernel proper, which will unnecessarily retain all
@@ -70,13 +109,20 @@
# a verification pass to see if any absolute relocations exist in any of the
# object files.
#
-extra-$(CONFIG_EFI_ARMSTUB) := $(lib-y)
-lib-$(CONFIG_EFI_ARMSTUB) := $(patsubst %.o,%.stub.o,$(lib-y))
+extra-y := $(lib-y)
+lib-y := $(patsubst %.o,%.stub.o,$(lib-y))
STUBCOPY_FLAGS-$(CONFIG_ARM64) += --prefix-alloc-sections=.init \
--prefix-symbols=__efistub_
STUBCOPY_RELOC-$(CONFIG_ARM64) := R_AARCH64_ABS
+# For RISC-V, we don't need anything special other than arm64. Keep all the
+# symbols in .init section and make sure that no absolute symbols references
+# doesn't exist.
+STUBCOPY_FLAGS-$(CONFIG_RISCV) += --prefix-alloc-sections=.init \
+ --prefix-symbols=__efistub_
+STUBCOPY_RELOC-$(CONFIG_RISCV) := R_RISCV_HI20
+
$(obj)/%.stub.o: $(obj)/%.o FORCE
$(call if_changed,stubcopy)
@@ -94,11 +140,3 @@
/bin/false; \
fi; \
$(OBJCOPY) $(STUBCOPY_FLAGS-y) $< $@
-
-#
-# ARM discards the .data section because it disallows r/w data in the
-# decompressor. So move our .data to .data.efistub, which is preserved
-# explicitly by the decompressor linker script.
-#
-STUBCOPY_FLAGS-$(CONFIG_ARM) += --rename-section .data=.data.efistub
-STUBCOPY_RELOC-$(CONFIG_ARM) := R_ARM_ABS
diff --git a/drivers/firmware/efi/libstub/alignedmem.c b/drivers/firmware/efi/libstub/alignedmem.c
new file mode 100644
index 0000000..1de9878
--- /dev/null
+++ b/drivers/firmware/efi/libstub/alignedmem.c
@@ -0,0 +1,57 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/efi.h>
+#include <asm/efi.h>
+
+#include "efistub.h"
+
+/**
+ * efi_allocate_pages_aligned() - Allocate memory pages
+ * @size: minimum number of bytes to allocate
+ * @addr: On return the address of the first allocated page. The first
+ * allocated page has alignment EFI_ALLOC_ALIGN which is an
+ * architecture dependent multiple of the page size.
+ * @max: the address that the last allocated memory page shall not
+ * exceed
+ * @align: minimum alignment of the base of the allocation
+ *
+ * Allocate pages as EFI_LOADER_DATA. The allocated pages are aligned according
+ * to @align, which should be >= EFI_ALLOC_ALIGN. The last allocated page will
+ * not exceed the address given by @max.
+ *
+ * Return: status code
+ */
+efi_status_t efi_allocate_pages_aligned(unsigned long size, unsigned long *addr,
+ unsigned long max, unsigned long align)
+{
+ efi_physical_addr_t alloc_addr;
+ efi_status_t status;
+ int slack;
+
+ if (align < EFI_ALLOC_ALIGN)
+ align = EFI_ALLOC_ALIGN;
+
+ alloc_addr = ALIGN_DOWN(max + 1, align) - 1;
+ size = round_up(size, EFI_ALLOC_ALIGN);
+ slack = align / EFI_PAGE_SIZE - 1;
+
+ status = efi_bs_call(allocate_pages, EFI_ALLOCATE_MAX_ADDRESS,
+ EFI_LOADER_DATA, size / EFI_PAGE_SIZE + slack,
+ &alloc_addr);
+ if (status != EFI_SUCCESS)
+ return status;
+
+ *addr = ALIGN((unsigned long)alloc_addr, align);
+
+ if (slack > 0) {
+ int l = (alloc_addr & (align - 1)) / EFI_PAGE_SIZE;
+
+ if (l) {
+ efi_bs_call(free_pages, alloc_addr, slack - l + 1);
+ slack = l - 1;
+ }
+ if (slack)
+ efi_bs_call(free_pages, *addr + size, slack);
+ }
+ return EFI_SUCCESS;
+}
diff --git a/drivers/firmware/efi/libstub/arm-stub.c b/drivers/firmware/efi/libstub/arm-stub.c
deleted file mode 100644
index c382a48..0000000
--- a/drivers/firmware/efi/libstub/arm-stub.c
+++ /dev/null
@@ -1,403 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * EFI stub implementation that is shared by arm and arm64 architectures.
- * This should be #included by the EFI stub implementation files.
- *
- * Copyright (C) 2013,2014 Linaro Limited
- * Roy Franz <roy.franz@linaro.org
- * Copyright (C) 2013 Red Hat, Inc.
- * Mark Salter <msalter@redhat.com>
- */
-
-#include <linux/efi.h>
-#include <linux/sort.h>
-#include <asm/efi.h>
-
-#include "efistub.h"
-
-/*
- * This is the base address at which to start allocating virtual memory ranges
- * for UEFI Runtime Services. This is in the low TTBR0 range so that we can use
- * any allocation we choose, and eliminate the risk of a conflict after kexec.
- * The value chosen is the largest non-zero power of 2 suitable for this purpose
- * both on 32-bit and 64-bit ARM CPUs, to maximize the likelihood that it can
- * be mapped efficiently.
- * Since 32-bit ARM could potentially execute with a 1G/3G user/kernel split,
- * map everything below 1 GB. (512 MB is a reasonable upper bound for the
- * entire footprint of the UEFI runtime services memory regions)
- */
-#define EFI_RT_VIRTUAL_BASE SZ_512M
-#define EFI_RT_VIRTUAL_SIZE SZ_512M
-
-#ifdef CONFIG_ARM64
-# define EFI_RT_VIRTUAL_LIMIT DEFAULT_MAP_WINDOW_64
-#else
-# define EFI_RT_VIRTUAL_LIMIT TASK_SIZE
-#endif
-
-static u64 virtmap_base = EFI_RT_VIRTUAL_BASE;
-
-void efi_char16_printk(efi_system_table_t *sys_table_arg,
- efi_char16_t *str)
-{
- struct efi_simple_text_output_protocol *out;
-
- out = (struct efi_simple_text_output_protocol *)sys_table_arg->con_out;
- out->output_string(out, str);
-}
-
-static struct screen_info *setup_graphics(efi_system_table_t *sys_table_arg)
-{
- efi_guid_t gop_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
- efi_status_t status;
- unsigned long size;
- void **gop_handle = NULL;
- struct screen_info *si = NULL;
-
- size = 0;
- status = efi_call_early(locate_handle, EFI_LOCATE_BY_PROTOCOL,
- &gop_proto, NULL, &size, gop_handle);
- if (status == EFI_BUFFER_TOO_SMALL) {
- si = alloc_screen_info(sys_table_arg);
- if (!si)
- return NULL;
- efi_setup_gop(sys_table_arg, si, &gop_proto, size);
- }
- return si;
-}
-
-void install_memreserve_table(efi_system_table_t *sys_table_arg)
-{
- struct linux_efi_memreserve *rsv;
- efi_guid_t memreserve_table_guid = LINUX_EFI_MEMRESERVE_TABLE_GUID;
- efi_status_t status;
-
- status = efi_call_early(allocate_pool, EFI_LOADER_DATA, sizeof(*rsv),
- (void **)&rsv);
- if (status != EFI_SUCCESS) {
- pr_efi_err(sys_table_arg, "Failed to allocate memreserve entry!\n");
- return;
- }
-
- rsv->next = 0;
- rsv->size = 0;
- atomic_set(&rsv->count, 0);
-
- status = efi_call_early(install_configuration_table,
- &memreserve_table_guid,
- rsv);
- if (status != EFI_SUCCESS)
- pr_efi_err(sys_table_arg, "Failed to install memreserve config table!\n");
-}
-
-
-/*
- * This function handles the architcture specific differences between arm and
- * arm64 regarding where the kernel image must be loaded and any memory that
- * must be reserved. On failure it is required to free all
- * all allocations it has made.
- */
-efi_status_t handle_kernel_image(efi_system_table_t *sys_table,
- unsigned long *image_addr,
- unsigned long *image_size,
- unsigned long *reserve_addr,
- unsigned long *reserve_size,
- unsigned long dram_base,
- efi_loaded_image_t *image);
-/*
- * EFI entry point for the arm/arm64 EFI stubs. This is the entrypoint
- * that is described in the PE/COFF header. Most of the code is the same
- * for both archictectures, with the arch-specific code provided in the
- * handle_kernel_image() function.
- */
-unsigned long efi_entry(void *handle, efi_system_table_t *sys_table,
- unsigned long *image_addr)
-{
- efi_loaded_image_t *image;
- efi_status_t status;
- unsigned long image_size = 0;
- unsigned long dram_base;
- /* addr/point and size pairs for memory management*/
- unsigned long initrd_addr;
- u64 initrd_size = 0;
- unsigned long fdt_addr = 0; /* Original DTB */
- unsigned long fdt_size = 0;
- char *cmdline_ptr = NULL;
- int cmdline_size = 0;
- unsigned long new_fdt_addr;
- efi_guid_t loaded_image_proto = LOADED_IMAGE_PROTOCOL_GUID;
- unsigned long reserve_addr = 0;
- unsigned long reserve_size = 0;
- enum efi_secureboot_mode secure_boot;
- struct screen_info *si;
-
- /* Check if we were booted by the EFI firmware */
- if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
- goto fail;
-
- status = check_platform_features(sys_table);
- if (status != EFI_SUCCESS)
- goto fail;
-
- /*
- * Get a handle to the loaded image protocol. This is used to get
- * information about the running image, such as size and the command
- * line.
- */
- status = sys_table->boottime->handle_protocol(handle,
- &loaded_image_proto, (void *)&image);
- if (status != EFI_SUCCESS) {
- pr_efi_err(sys_table, "Failed to get loaded image protocol\n");
- goto fail;
- }
-
- dram_base = get_dram_base(sys_table);
- if (dram_base == EFI_ERROR) {
- pr_efi_err(sys_table, "Failed to find DRAM base\n");
- goto fail;
- }
-
- /*
- * Get the command line from EFI, using the LOADED_IMAGE
- * protocol. We are going to copy the command line into the
- * device tree, so this can be allocated anywhere.
- */
- cmdline_ptr = efi_convert_cmdline(sys_table, image, &cmdline_size);
- if (!cmdline_ptr) {
- pr_efi_err(sys_table, "getting command line via LOADED_IMAGE_PROTOCOL\n");
- goto fail;
- }
-
- if (IS_ENABLED(CONFIG_CMDLINE_EXTEND) ||
- IS_ENABLED(CONFIG_CMDLINE_FORCE) ||
- cmdline_size == 0)
- efi_parse_options(CONFIG_CMDLINE);
-
- if (!IS_ENABLED(CONFIG_CMDLINE_FORCE) && cmdline_size > 0)
- efi_parse_options(cmdline_ptr);
-
- pr_efi(sys_table, "Booting Linux Kernel...\n");
-
- si = setup_graphics(sys_table);
-
- status = handle_kernel_image(sys_table, image_addr, &image_size,
- &reserve_addr,
- &reserve_size,
- dram_base, image);
- if (status != EFI_SUCCESS) {
- pr_efi_err(sys_table, "Failed to relocate kernel\n");
- goto fail_free_cmdline;
- }
-
- /* Ask the firmware to clear memory on unclean shutdown */
- efi_enable_reset_attack_mitigation(sys_table);
-
- secure_boot = efi_get_secureboot(sys_table);
-
- /*
- * Unauthenticated device tree data is a security hazard, so ignore
- * 'dtb=' unless UEFI Secure Boot is disabled. We assume that secure
- * boot is enabled if we can't determine its state.
- */
- if (!IS_ENABLED(CONFIG_EFI_ARMSTUB_DTB_LOADER) ||
- secure_boot != efi_secureboot_mode_disabled) {
- if (strstr(cmdline_ptr, "dtb="))
- pr_efi(sys_table, "Ignoring DTB from command line.\n");
- } else {
- status = handle_cmdline_files(sys_table, image, cmdline_ptr,
- "dtb=",
- ~0UL, &fdt_addr, &fdt_size);
-
- if (status != EFI_SUCCESS) {
- pr_efi_err(sys_table, "Failed to load device tree!\n");
- goto fail_free_image;
- }
- }
-
- if (fdt_addr) {
- pr_efi(sys_table, "Using DTB from command line\n");
- } else {
- /* Look for a device tree configuration table entry. */
- fdt_addr = (uintptr_t)get_fdt(sys_table, &fdt_size);
- if (fdt_addr)
- pr_efi(sys_table, "Using DTB from configuration table\n");
- }
-
- if (!fdt_addr)
- pr_efi(sys_table, "Generating empty DTB\n");
-
- status = handle_cmdline_files(sys_table, image, cmdline_ptr, "initrd=",
- efi_get_max_initrd_addr(dram_base,
- *image_addr),
- (unsigned long *)&initrd_addr,
- (unsigned long *)&initrd_size);
- if (status != EFI_SUCCESS)
- pr_efi_err(sys_table, "Failed initrd from command line!\n");
-
- efi_random_get_seed(sys_table);
-
- /* hibernation expects the runtime regions to stay in the same place */
- if (!IS_ENABLED(CONFIG_HIBERNATION) && !nokaslr()) {
- /*
- * Randomize the base of the UEFI runtime services region.
- * Preserve the 2 MB alignment of the region by taking a
- * shift of 21 bit positions into account when scaling
- * the headroom value using a 32-bit random value.
- */
- static const u64 headroom = EFI_RT_VIRTUAL_LIMIT -
- EFI_RT_VIRTUAL_BASE -
- EFI_RT_VIRTUAL_SIZE;
- u32 rnd;
-
- status = efi_get_random_bytes(sys_table, sizeof(rnd),
- (u8 *)&rnd);
- if (status == EFI_SUCCESS) {
- virtmap_base = EFI_RT_VIRTUAL_BASE +
- (((headroom >> 21) * rnd) >> (32 - 21));
- }
- }
-
- install_memreserve_table(sys_table);
-
- new_fdt_addr = fdt_addr;
- status = allocate_new_fdt_and_exit_boot(sys_table, handle,
- &new_fdt_addr, efi_get_max_fdt_addr(dram_base),
- initrd_addr, initrd_size, cmdline_ptr,
- fdt_addr, fdt_size);
-
- /*
- * If all went well, we need to return the FDT address to the
- * calling function so it can be passed to kernel as part of
- * the kernel boot protocol.
- */
- if (status == EFI_SUCCESS)
- return new_fdt_addr;
-
- pr_efi_err(sys_table, "Failed to update FDT and exit boot services\n");
-
- efi_free(sys_table, initrd_size, initrd_addr);
- efi_free(sys_table, fdt_size, fdt_addr);
-
-fail_free_image:
- efi_free(sys_table, image_size, *image_addr);
- efi_free(sys_table, reserve_size, reserve_addr);
-fail_free_cmdline:
- free_screen_info(sys_table, si);
- efi_free(sys_table, cmdline_size, (unsigned long)cmdline_ptr);
-fail:
- return EFI_ERROR;
-}
-
-static int cmp_mem_desc(const void *l, const void *r)
-{
- const efi_memory_desc_t *left = l, *right = r;
-
- return (left->phys_addr > right->phys_addr) ? 1 : -1;
-}
-
-/*
- * Returns whether region @left ends exactly where region @right starts,
- * or false if either argument is NULL.
- */
-static bool regions_are_adjacent(efi_memory_desc_t *left,
- efi_memory_desc_t *right)
-{
- u64 left_end;
-
- if (left == NULL || right == NULL)
- return false;
-
- left_end = left->phys_addr + left->num_pages * EFI_PAGE_SIZE;
-
- return left_end == right->phys_addr;
-}
-
-/*
- * Returns whether region @left and region @right have compatible memory type
- * mapping attributes, and are both EFI_MEMORY_RUNTIME regions.
- */
-static bool regions_have_compatible_memory_type_attrs(efi_memory_desc_t *left,
- efi_memory_desc_t *right)
-{
- static const u64 mem_type_mask = EFI_MEMORY_WB | EFI_MEMORY_WT |
- EFI_MEMORY_WC | EFI_MEMORY_UC |
- EFI_MEMORY_RUNTIME;
-
- return ((left->attribute ^ right->attribute) & mem_type_mask) == 0;
-}
-
-/*
- * efi_get_virtmap() - create a virtual mapping for the EFI memory map
- *
- * This function populates the virt_addr fields of all memory region descriptors
- * in @memory_map whose EFI_MEMORY_RUNTIME attribute is set. Those descriptors
- * are also copied to @runtime_map, and their total count is returned in @count.
- */
-void efi_get_virtmap(efi_memory_desc_t *memory_map, unsigned long map_size,
- unsigned long desc_size, efi_memory_desc_t *runtime_map,
- int *count)
-{
- u64 efi_virt_base = virtmap_base;
- efi_memory_desc_t *in, *prev = NULL, *out = runtime_map;
- int l;
-
- /*
- * To work around potential issues with the Properties Table feature
- * introduced in UEFI 2.5, which may split PE/COFF executable images
- * in memory into several RuntimeServicesCode and RuntimeServicesData
- * regions, we need to preserve the relative offsets between adjacent
- * EFI_MEMORY_RUNTIME regions with the same memory type attributes.
- * The easiest way to find adjacent regions is to sort the memory map
- * before traversing it.
- */
- if (IS_ENABLED(CONFIG_ARM64))
- sort(memory_map, map_size / desc_size, desc_size, cmp_mem_desc,
- NULL);
-
- for (l = 0; l < map_size; l += desc_size, prev = in) {
- u64 paddr, size;
-
- in = (void *)memory_map + l;
- if (!(in->attribute & EFI_MEMORY_RUNTIME))
- continue;
-
- paddr = in->phys_addr;
- size = in->num_pages * EFI_PAGE_SIZE;
-
- if (novamap()) {
- in->virt_addr = in->phys_addr;
- continue;
- }
-
- /*
- * Make the mapping compatible with 64k pages: this allows
- * a 4k page size kernel to kexec a 64k page size kernel and
- * vice versa.
- */
- if ((IS_ENABLED(CONFIG_ARM64) &&
- !regions_are_adjacent(prev, in)) ||
- !regions_have_compatible_memory_type_attrs(prev, in)) {
-
- paddr = round_down(in->phys_addr, SZ_64K);
- size += in->phys_addr - paddr;
-
- /*
- * Avoid wasting memory on PTEs by choosing a virtual
- * base that is compatible with section mappings if this
- * region has the appropriate size and physical
- * alignment. (Sections are 2 MB on 4k granule kernels)
- */
- if (IS_ALIGNED(in->phys_addr, SZ_2M) && size >= SZ_2M)
- efi_virt_base = round_up(efi_virt_base, SZ_2M);
- else
- efi_virt_base = round_up(efi_virt_base, SZ_64K);
- }
-
- in->virt_addr = efi_virt_base + in->phys_addr - paddr;
- efi_virt_base += size;
-
- memcpy(out, in, desc_size);
- out = (void *)out + desc_size;
- ++*count;
- }
-}
diff --git a/drivers/firmware/efi/libstub/arm32-stub.c b/drivers/firmware/efi/libstub/arm32-stub.c
index 41213bf..4b5b240 100644
--- a/drivers/firmware/efi/libstub/arm32-stub.c
+++ b/drivers/firmware/efi/libstub/arm32-stub.c
@@ -7,10 +7,49 @@
#include "efistub.h"
-efi_status_t check_platform_features(efi_system_table_t *sys_table_arg)
+static efi_guid_t cpu_state_guid = LINUX_EFI_ARM_CPU_STATE_TABLE_GUID;
+
+struct efi_arm_entry_state *efi_entry_state;
+
+static void get_cpu_state(u32 *cpsr, u32 *sctlr)
{
+ asm("mrs %0, cpsr" : "=r"(*cpsr));
+ if ((*cpsr & MODE_MASK) == HYP_MODE)
+ asm("mrc p15, 4, %0, c1, c0, 0" : "=r"(*sctlr));
+ else
+ asm("mrc p15, 0, %0, c1, c0, 0" : "=r"(*sctlr));
+}
+
+efi_status_t check_platform_features(void)
+{
+ efi_status_t status;
+ u32 cpsr, sctlr;
int block;
+ get_cpu_state(&cpsr, &sctlr);
+
+ efi_info("Entering in %s mode with MMU %sabled\n",
+ ((cpsr & MODE_MASK) == HYP_MODE) ? "HYP" : "SVC",
+ (sctlr & 1) ? "en" : "dis");
+
+ status = efi_bs_call(allocate_pool, EFI_LOADER_DATA,
+ sizeof(*efi_entry_state),
+ (void **)&efi_entry_state);
+ if (status != EFI_SUCCESS) {
+ efi_err("allocate_pool() failed\n");
+ return status;
+ }
+
+ efi_entry_state->cpsr_before_ebs = cpsr;
+ efi_entry_state->sctlr_before_ebs = sctlr;
+
+ status = efi_bs_call(install_configuration_table, &cpu_state_guid,
+ efi_entry_state);
+ if (status != EFI_SUCCESS) {
+ efi_err("install_configuration_table() failed\n");
+ goto free_state;
+ }
+
/* non-LPAE kernels can run anywhere */
if (!IS_ENABLED(CONFIG_ARM_LPAE))
return EFI_SUCCESS;
@@ -18,15 +57,28 @@
/* LPAE kernels need compatible hardware */
block = cpuid_feature_extract(CPUID_EXT_MMFR0, 0);
if (block < 5) {
- pr_efi_err(sys_table_arg, "This LPAE kernel is not supported by your CPU\n");
- return EFI_UNSUPPORTED;
+ efi_err("This LPAE kernel is not supported by your CPU\n");
+ status = EFI_UNSUPPORTED;
+ goto drop_table;
}
return EFI_SUCCESS;
+
+drop_table:
+ efi_bs_call(install_configuration_table, &cpu_state_guid, NULL);
+free_state:
+ efi_bs_call(free_pool, efi_entry_state);
+ return status;
+}
+
+void efi_handle_post_ebs_state(void)
+{
+ get_cpu_state(&efi_entry_state->cpsr_after_ebs,
+ &efi_entry_state->sctlr_after_ebs);
}
static efi_guid_t screen_info_guid = LINUX_EFI_ARM_SCREEN_INFO_TABLE_GUID;
-struct screen_info *alloc_screen_info(efi_system_table_t *sys_table_arg)
+struct screen_info *alloc_screen_info(void)
{
struct screen_info *si;
efi_status_t status;
@@ -37,219 +89,82 @@
* its contents while we hand over to the kernel proper from the
* decompressor.
*/
- status = efi_call_early(allocate_pool, EFI_RUNTIME_SERVICES_DATA,
- sizeof(*si), (void **)&si);
+ status = efi_bs_call(allocate_pool, EFI_RUNTIME_SERVICES_DATA,
+ sizeof(*si), (void **)&si);
if (status != EFI_SUCCESS)
return NULL;
- status = efi_call_early(install_configuration_table,
- &screen_info_guid, si);
+ status = efi_bs_call(install_configuration_table,
+ &screen_info_guid, si);
if (status == EFI_SUCCESS)
return si;
- efi_call_early(free_pool, si);
+ efi_bs_call(free_pool, si);
return NULL;
}
-void free_screen_info(efi_system_table_t *sys_table_arg, struct screen_info *si)
+void free_screen_info(struct screen_info *si)
{
if (!si)
return;
- efi_call_early(install_configuration_table, &screen_info_guid, NULL);
- efi_call_early(free_pool, si);
+ efi_bs_call(install_configuration_table, &screen_info_guid, NULL);
+ efi_bs_call(free_pool, si);
}
-static efi_status_t reserve_kernel_base(efi_system_table_t *sys_table_arg,
- unsigned long dram_base,
- unsigned long *reserve_addr,
- unsigned long *reserve_size)
-{
- efi_physical_addr_t alloc_addr;
- efi_memory_desc_t *memory_map;
- unsigned long nr_pages, map_size, desc_size, buff_size;
- efi_status_t status;
- unsigned long l;
-
- struct efi_boot_memmap map = {
- .map = &memory_map,
- .map_size = &map_size,
- .desc_size = &desc_size,
- .desc_ver = NULL,
- .key_ptr = NULL,
- .buff_size = &buff_size,
- };
-
- /*
- * Reserve memory for the uncompressed kernel image. This is
- * all that prevents any future allocations from conflicting
- * with the kernel. Since we can't tell from the compressed
- * image how much DRAM the kernel actually uses (due to BSS
- * size uncertainty) we allocate the maximum possible size.
- * Do this very early, as prints can cause memory allocations
- * that may conflict with this.
- */
- alloc_addr = dram_base + MAX_UNCOMP_KERNEL_SIZE;
- nr_pages = MAX_UNCOMP_KERNEL_SIZE / EFI_PAGE_SIZE;
- status = efi_call_early(allocate_pages, EFI_ALLOCATE_MAX_ADDRESS,
- EFI_BOOT_SERVICES_DATA, nr_pages, &alloc_addr);
- if (status == EFI_SUCCESS) {
- if (alloc_addr == dram_base) {
- *reserve_addr = alloc_addr;
- *reserve_size = MAX_UNCOMP_KERNEL_SIZE;
- return EFI_SUCCESS;
- }
- /*
- * If we end up here, the allocation succeeded but starts below
- * dram_base. This can only occur if the real base of DRAM is
- * not a multiple of 128 MB, in which case dram_base will have
- * been rounded up. Since this implies that a part of the region
- * was already occupied, we need to fall through to the code
- * below to ensure that the existing allocations don't conflict.
- * For this reason, we use EFI_BOOT_SERVICES_DATA above and not
- * EFI_LOADER_DATA, which we wouldn't able to distinguish from
- * allocations that we want to disallow.
- */
- }
-
- /*
- * If the allocation above failed, we may still be able to proceed:
- * if the only allocations in the region are of types that will be
- * released to the OS after ExitBootServices(), the decompressor can
- * safely overwrite them.
- */
- status = efi_get_memory_map(sys_table_arg, &map);
- if (status != EFI_SUCCESS) {
- pr_efi_err(sys_table_arg,
- "reserve_kernel_base(): Unable to retrieve memory map.\n");
- return status;
- }
-
- for (l = 0; l < map_size; l += desc_size) {
- efi_memory_desc_t *desc;
- u64 start, end;
-
- desc = (void *)memory_map + l;
- start = desc->phys_addr;
- end = start + desc->num_pages * EFI_PAGE_SIZE;
-
- /* Skip if entry does not intersect with region */
- if (start >= dram_base + MAX_UNCOMP_KERNEL_SIZE ||
- end <= dram_base)
- continue;
-
- switch (desc->type) {
- case EFI_BOOT_SERVICES_CODE:
- case EFI_BOOT_SERVICES_DATA:
- /* Ignore types that are released to the OS anyway */
- continue;
-
- case EFI_CONVENTIONAL_MEMORY:
- /*
- * Reserve the intersection between this entry and the
- * region.
- */
- start = max(start, (u64)dram_base);
- end = min(end, (u64)dram_base + MAX_UNCOMP_KERNEL_SIZE);
-
- status = efi_call_early(allocate_pages,
- EFI_ALLOCATE_ADDRESS,
- EFI_LOADER_DATA,
- (end - start) / EFI_PAGE_SIZE,
- &start);
- if (status != EFI_SUCCESS) {
- pr_efi_err(sys_table_arg,
- "reserve_kernel_base(): alloc failed.\n");
- goto out;
- }
- break;
-
- case EFI_LOADER_CODE:
- case EFI_LOADER_DATA:
- /*
- * These regions may be released and reallocated for
- * another purpose (including EFI_RUNTIME_SERVICE_DATA)
- * at any time during the execution of the OS loader,
- * so we cannot consider them as safe.
- */
- default:
- /*
- * Treat any other allocation in the region as unsafe */
- status = EFI_OUT_OF_RESOURCES;
- goto out;
- }
- }
-
- status = EFI_SUCCESS;
-out:
- efi_call_early(free_pool, memory_map);
- return status;
-}
-
-efi_status_t handle_kernel_image(efi_system_table_t *sys_table,
- unsigned long *image_addr,
+efi_status_t handle_kernel_image(unsigned long *image_addr,
unsigned long *image_size,
unsigned long *reserve_addr,
unsigned long *reserve_size,
- unsigned long dram_base,
efi_loaded_image_t *image)
{
- unsigned long kernel_base;
+ const int slack = TEXT_OFFSET - 5 * PAGE_SIZE;
+ int alloc_size = MAX_UNCOMP_KERNEL_SIZE + EFI_PHYS_ALIGN;
+ unsigned long alloc_base, kernel_base;
efi_status_t status;
/*
- * Verify that the DRAM base address is compatible with the ARM
- * boot protocol, which determines the base of DRAM by masking
- * off the low 27 bits of the address at which the zImage is
- * loaded. These assumptions are made by the decompressor,
- * before any memory map is available.
+ * Allocate space for the decompressed kernel as low as possible.
+ * The region should be 16 MiB aligned, but the first 'slack' bytes
+ * are not used by Linux, so we allow those to be occupied by the
+ * firmware.
*/
- kernel_base = round_up(dram_base, SZ_128M);
-
- /*
- * Note that some platforms (notably, the Raspberry Pi 2) put
- * spin-tables and other pieces of firmware at the base of RAM,
- * abusing the fact that the window of TEXT_OFFSET bytes at the
- * base of the kernel image is only partially used at the moment.
- * (Up to 5 pages are used for the swapper page tables)
- */
- kernel_base += TEXT_OFFSET - 5 * PAGE_SIZE;
-
- status = reserve_kernel_base(sys_table, kernel_base, reserve_addr,
- reserve_size);
+ status = efi_low_alloc_above(alloc_size, EFI_PAGE_SIZE, &alloc_base, 0x0);
if (status != EFI_SUCCESS) {
- pr_efi_err(sys_table, "Unable to allocate memory for uncompressed kernel.\n");
+ efi_err("Unable to allocate memory for uncompressed kernel.\n");
return status;
}
- /*
- * Relocate the zImage, so that it appears in the lowest 128 MB
- * memory window.
- */
- *image_size = image->image_size;
- status = efi_relocate_kernel(sys_table, image_addr, *image_size,
- *image_size,
- kernel_base + MAX_UNCOMP_KERNEL_SIZE, 0, 0);
- if (status != EFI_SUCCESS) {
- pr_efi_err(sys_table, "Failed to relocate kernel.\n");
- efi_free(sys_table, *reserve_size, *reserve_addr);
- *reserve_size = 0;
- return status;
+ if ((alloc_base % EFI_PHYS_ALIGN) > slack) {
+ /*
+ * More than 'slack' bytes are already occupied at the base of
+ * the allocation, so we need to advance to the next 16 MiB block.
+ */
+ kernel_base = round_up(alloc_base, EFI_PHYS_ALIGN);
+ efi_info("Free memory starts at 0x%lx, setting kernel_base to 0x%lx\n",
+ alloc_base, kernel_base);
+ } else {
+ kernel_base = round_down(alloc_base, EFI_PHYS_ALIGN);
}
- /*
- * Check to see if we were able to allocate memory low enough
- * in memory. The kernel determines the base of DRAM from the
- * address at which the zImage is loaded.
- */
- if (*image_addr + *image_size > dram_base + ZIMAGE_OFFSET_LIMIT) {
- pr_efi_err(sys_table, "Failed to relocate kernel, no low memory available.\n");
- efi_free(sys_table, *reserve_size, *reserve_addr);
- *reserve_size = 0;
- efi_free(sys_table, *image_size, *image_addr);
- *image_size = 0;
- return EFI_LOAD_ERROR;
+ *reserve_addr = kernel_base + slack;
+ *reserve_size = MAX_UNCOMP_KERNEL_SIZE;
+
+ /* now free the parts that we will not use */
+ if (*reserve_addr > alloc_base) {
+ efi_bs_call(free_pages, alloc_base,
+ (*reserve_addr - alloc_base) / EFI_PAGE_SIZE);
+ alloc_size -= *reserve_addr - alloc_base;
}
+ efi_bs_call(free_pages, *reserve_addr + MAX_UNCOMP_KERNEL_SIZE,
+ (alloc_size - MAX_UNCOMP_KERNEL_SIZE) / EFI_PAGE_SIZE);
+
+ *image_addr = kernel_base + TEXT_OFFSET;
+ *image_size = 0;
+
+ efi_debug("image addr == 0x%lx, reserve_addr == 0x%lx\n",
+ *image_addr, *reserve_addr);
+
return EFI_SUCCESS;
}
diff --git a/drivers/firmware/efi/libstub/arm64-stub.c b/drivers/firmware/efi/libstub/arm64-stub.c
index 1550d24..415a971 100644
--- a/drivers/firmware/efi/libstub/arm64-stub.c
+++ b/drivers/firmware/efi/libstub/arm64-stub.c
@@ -6,22 +6,16 @@
* Adapted from ARM version by Mark Salter <msalter@redhat.com>
*/
-/*
- * To prevent the compiler from emitting GOT-indirected (and thus absolute)
- * references to the section markers, override their visibility as 'hidden'
- */
-#pragma GCC visibility push(hidden)
-#include <asm/sections.h>
-#pragma GCC visibility pop
#include <linux/efi.h>
#include <asm/efi.h>
#include <asm/memory.h>
+#include <asm/sections.h>
#include <asm/sysreg.h>
#include "efistub.h"
-efi_status_t check_platform_features(efi_system_table_t *sys_table_arg)
+efi_status_t check_platform_features(void)
{
u64 tg;
@@ -32,124 +26,143 @@
tg = (read_cpuid(ID_AA64MMFR0_EL1) >> ID_AA64MMFR0_TGRAN_SHIFT) & 0xf;
if (tg != ID_AA64MMFR0_TGRAN_SUPPORTED) {
if (IS_ENABLED(CONFIG_ARM64_64K_PAGES))
- pr_efi_err(sys_table_arg, "This 64 KB granular kernel is not supported by your CPU\n");
+ efi_err("This 64 KB granular kernel is not supported by your CPU\n");
else
- pr_efi_err(sys_table_arg, "This 16 KB granular kernel is not supported by your CPU\n");
+ efi_err("This 16 KB granular kernel is not supported by your CPU\n");
return EFI_UNSUPPORTED;
}
return EFI_SUCCESS;
}
-efi_status_t handle_kernel_image(efi_system_table_t *sys_table_arg,
- unsigned long *image_addr,
+/*
+ * Distro versions of GRUB may ignore the BSS allocation entirely (i.e., fail
+ * to provide space, and fail to zero it). Check for this condition by double
+ * checking that the first and the last byte of the image are covered by the
+ * same EFI memory map entry.
+ */
+static bool check_image_region(u64 base, u64 size)
+{
+ unsigned long map_size, desc_size, buff_size;
+ efi_memory_desc_t *memory_map;
+ struct efi_boot_memmap map;
+ efi_status_t status;
+ bool ret = false;
+ int map_offset;
+
+ map.map = &memory_map;
+ map.map_size = &map_size;
+ map.desc_size = &desc_size;
+ map.desc_ver = NULL;
+ map.key_ptr = NULL;
+ map.buff_size = &buff_size;
+
+ status = efi_get_memory_map(&map);
+ if (status != EFI_SUCCESS)
+ return false;
+
+ for (map_offset = 0; map_offset < map_size; map_offset += desc_size) {
+ efi_memory_desc_t *md = (void *)memory_map + map_offset;
+ u64 end = md->phys_addr + md->num_pages * EFI_PAGE_SIZE;
+
+ /*
+ * Find the region that covers base, and return whether
+ * it covers base+size bytes.
+ */
+ if (base >= md->phys_addr && base < end) {
+ ret = (base + size) <= end;
+ break;
+ }
+ }
+
+ efi_bs_call(free_pool, memory_map);
+
+ return ret;
+}
+
+efi_status_t handle_kernel_image(unsigned long *image_addr,
unsigned long *image_size,
unsigned long *reserve_addr,
unsigned long *reserve_size,
- unsigned long dram_base,
efi_loaded_image_t *image)
{
efi_status_t status;
unsigned long kernel_size, kernel_memsize = 0;
- void *old_image_addr = (void *)*image_addr;
- unsigned long preferred_offset;
- u64 phys_seed = 0;
+ u32 phys_seed = 0;
+
+ /*
+ * Although relocatable kernels can fix up the misalignment with
+ * respect to MIN_KIMG_ALIGN, the resulting virtual text addresses are
+ * subtly out of sync with those recorded in the vmlinux when kaslr is
+ * disabled but the image required relocation anyway. Therefore retain
+ * 2M alignment if KASLR was explicitly disabled, even if it was not
+ * going to be activated to begin with.
+ */
+ u64 min_kimg_align = efi_nokaslr ? MIN_KIMG_ALIGN : EFI_KIMG_ALIGN;
if (IS_ENABLED(CONFIG_RANDOMIZE_BASE)) {
- if (!nokaslr()) {
- status = efi_get_random_bytes(sys_table_arg,
- sizeof(phys_seed),
+ if (!efi_nokaslr) {
+ status = efi_get_random_bytes(sizeof(phys_seed),
(u8 *)&phys_seed);
if (status == EFI_NOT_FOUND) {
- pr_efi(sys_table_arg, "EFI_RNG_PROTOCOL unavailable, no randomness supplied\n");
+ efi_info("EFI_RNG_PROTOCOL unavailable, KASLR will be disabled\n");
+ efi_nokaslr = true;
} else if (status != EFI_SUCCESS) {
- pr_efi_err(sys_table_arg, "efi_get_random_bytes() failed\n");
- return status;
+ efi_err("efi_get_random_bytes() failed (0x%lx), KASLR will be disabled\n",
+ status);
+ efi_nokaslr = true;
}
} else {
- pr_efi(sys_table_arg, "KASLR disabled on kernel command line\n");
+ efi_info("KASLR disabled on kernel command line\n");
}
}
- /*
- * The preferred offset of the kernel Image is TEXT_OFFSET bytes beyond
- * a 2 MB aligned base, which itself may be lower than dram_base, as
- * long as the resulting offset equals or exceeds it.
- */
- preferred_offset = round_down(dram_base, MIN_KIMG_ALIGN) + TEXT_OFFSET;
- if (preferred_offset < dram_base)
- preferred_offset += MIN_KIMG_ALIGN;
+ if (image->image_base != _text)
+ efi_err("FIRMWARE BUG: efi_loaded_image_t::image_base has bogus value\n");
+
+ if (!IS_ALIGNED((u64)_text, SEGMENT_ALIGN))
+ efi_err("FIRMWARE BUG: kernel image not aligned on %dk boundary\n",
+ SEGMENT_ALIGN >> 10);
kernel_size = _edata - _text;
kernel_memsize = kernel_size + (_end - _edata);
+ *reserve_size = kernel_memsize;
if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && phys_seed != 0) {
/*
- * If CONFIG_DEBUG_ALIGN_RODATA is not set, produce a
- * displacement in the interval [0, MIN_KIMG_ALIGN) that
- * doesn't violate this kernel's de-facto alignment
- * constraints.
- */
- u32 mask = (MIN_KIMG_ALIGN - 1) & ~(EFI_KIMG_ALIGN - 1);
- u32 offset = !IS_ENABLED(CONFIG_DEBUG_ALIGN_RODATA) ?
- (phys_seed >> 32) & mask : TEXT_OFFSET;
-
- /*
- * With CONFIG_RANDOMIZE_TEXT_OFFSET=y, TEXT_OFFSET may not
- * be a multiple of EFI_KIMG_ALIGN, and we must ensure that
- * we preserve the misalignment of 'offset' relative to
- * EFI_KIMG_ALIGN so that statically allocated objects whose
- * alignment exceeds PAGE_SIZE appear correctly aligned in
- * memory.
- */
- offset |= TEXT_OFFSET % EFI_KIMG_ALIGN;
-
- /*
* If KASLR is enabled, and we have some randomness available,
* locate the kernel at a randomized offset in physical memory.
*/
- *reserve_size = kernel_memsize + offset;
- status = efi_random_alloc(sys_table_arg, *reserve_size,
- MIN_KIMG_ALIGN, reserve_addr,
- (u32)phys_seed);
-
- *image_addr = *reserve_addr + offset;
+ status = efi_random_alloc(*reserve_size, min_kimg_align,
+ reserve_addr, phys_seed);
} else {
- /*
- * Else, try a straight allocation at the preferred offset.
- * This will work around the issue where, if dram_base == 0x0,
- * efi_low_alloc() refuses to allocate at 0x0 (to prevent the
- * address of the allocation to be mistaken for a FAIL return
- * value or a NULL pointer). It will also ensure that, on
- * platforms where the [dram_base, dram_base + TEXT_OFFSET)
- * interval is partially occupied by the firmware (like on APM
- * Mustang), we can still place the kernel at the address
- * 'dram_base + TEXT_OFFSET'.
- */
- if (*image_addr == preferred_offset)
- return EFI_SUCCESS;
-
- *image_addr = *reserve_addr = preferred_offset;
- *reserve_size = round_up(kernel_memsize, EFI_ALLOC_ALIGN);
-
- status = efi_call_early(allocate_pages, EFI_ALLOCATE_ADDRESS,
- EFI_LOADER_DATA,
- *reserve_size / EFI_PAGE_SIZE,
- (efi_physical_addr_t *)reserve_addr);
+ status = EFI_OUT_OF_RESOURCES;
}
if (status != EFI_SUCCESS) {
- *reserve_size = kernel_memsize + TEXT_OFFSET;
- status = efi_low_alloc(sys_table_arg, *reserve_size,
- MIN_KIMG_ALIGN, reserve_addr);
+ if (!check_image_region((u64)_text, kernel_memsize)) {
+ efi_err("FIRMWARE BUG: Image BSS overlaps adjacent EFI memory region\n");
+ } else if (IS_ALIGNED((u64)_text, min_kimg_align)) {
+ /*
+ * Just execute from wherever we were loaded by the
+ * UEFI PE/COFF loader if the alignment is suitable.
+ */
+ *image_addr = (u64)_text;
+ *reserve_size = 0;
+ return EFI_SUCCESS;
+ }
+
+ status = efi_allocate_pages_aligned(*reserve_size, reserve_addr,
+ ULONG_MAX, min_kimg_align);
if (status != EFI_SUCCESS) {
- pr_efi_err(sys_table_arg, "Failed to relocate kernel\n");
+ efi_err("Failed to relocate kernel\n");
*reserve_size = 0;
return status;
}
- *image_addr = *reserve_addr + TEXT_OFFSET;
}
- memcpy((void *)*image_addr, old_image_addr, kernel_size);
+
+ *image_addr = *reserve_addr;
+ memcpy((void *)*image_addr, _text, kernel_size);
return EFI_SUCCESS;
}
diff --git a/drivers/firmware/efi/libstub/efi-stub-helper.c b/drivers/firmware/efi/libstub/efi-stub-helper.c
index 35dbc27..aa8da0a 100644
--- a/drivers/firmware/efi/libstub/efi-stub-helper.c
+++ b/drivers/firmware/efi/libstub/efi-stub-helper.c
@@ -7,875 +7,451 @@
* Copyright 2011 Intel Corporation; author Matt Fleming
*/
+#include <stdarg.h>
+
+#include <linux/ctype.h>
#include <linux/efi.h>
+#include <linux/kernel.h>
+#include <linux/printk.h> /* For CONSOLE_LOGLEVEL_* */
#include <asm/efi.h>
+#include <asm/setup.h>
#include "efistub.h"
-/*
- * Some firmware implementations have problems reading files in one go.
- * A read chunk size of 1MB seems to work for most platforms.
- *
- * Unfortunately, reading files in chunks triggers *other* bugs on some
- * platforms, so we provide a way to disable this workaround, which can
- * be done by passing "efi=nochunk" on the EFI boot stub command line.
- *
- * If you experience issues with initrd images being corrupt it's worth
- * trying efi=nochunk, but chunking is enabled by default because there
- * are far more machines that require the workaround than those that
- * break with it enabled.
+bool efi_nochunk;
+bool efi_nokaslr = !IS_ENABLED(CONFIG_RANDOMIZE_BASE);
+bool efi_noinitrd;
+int efi_loglevel = CONSOLE_LOGLEVEL_DEFAULT;
+bool efi_novamap;
+
+static bool efi_nosoftreserve;
+static bool efi_disable_pci_dma = IS_ENABLED(CONFIG_EFI_DISABLE_PCI_DMA);
+
+bool __pure __efi_soft_reserve_enabled(void)
+{
+ return !efi_nosoftreserve;
+}
+
+/**
+ * efi_char16_puts() - Write a UCS-2 encoded string to the console
+ * @str: UCS-2 encoded string
*/
-#define EFI_READ_CHUNK_SIZE (1024 * 1024)
-
-static unsigned long __chunk_size = EFI_READ_CHUNK_SIZE;
-
-static int __section(.data) __nokaslr;
-static int __section(.data) __quiet;
-static int __section(.data) __novamap;
-
-int __pure nokaslr(void)
+void efi_char16_puts(efi_char16_t *str)
{
- return __nokaslr;
-}
-int __pure is_quiet(void)
-{
- return __quiet;
-}
-int __pure novamap(void)
-{
- return __novamap;
+ efi_call_proto(efi_table_attr(efi_system_table, con_out),
+ output_string, str);
}
-#define EFI_MMAP_NR_SLACK_SLOTS 8
-
-struct file_info {
- efi_file_handle_t *handle;
- u64 size;
-};
-
-void efi_printk(efi_system_table_t *sys_table_arg, char *str)
+static
+u32 utf8_to_utf32(const u8 **s8)
{
- char *s8;
+ u32 c32;
+ u8 c0, cx;
+ size_t clen, i;
- for (s8 = str; *s8; s8++) {
- efi_char16_t ch[2] = { 0 };
-
- ch[0] = *s8;
- if (*s8 == '\n') {
- efi_char16_t nl[2] = { '\r', 0 };
- efi_char16_printk(sys_table_arg, nl);
- }
-
- efi_char16_printk(sys_table_arg, ch);
- }
-}
-
-static inline bool mmap_has_headroom(unsigned long buff_size,
- unsigned long map_size,
- unsigned long desc_size)
-{
- unsigned long slack = buff_size - map_size;
-
- return slack / desc_size >= EFI_MMAP_NR_SLACK_SLOTS;
-}
-
-efi_status_t efi_get_memory_map(efi_system_table_t *sys_table_arg,
- struct efi_boot_memmap *map)
-{
- efi_memory_desc_t *m = NULL;
- efi_status_t status;
- unsigned long key;
- u32 desc_version;
-
- *map->desc_size = sizeof(*m);
- *map->map_size = *map->desc_size * 32;
- *map->buff_size = *map->map_size;
-again:
- status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
- *map->map_size, (void **)&m);
- if (status != EFI_SUCCESS)
- goto fail;
-
- *map->desc_size = 0;
- key = 0;
- status = efi_call_early(get_memory_map, map->map_size, m,
- &key, map->desc_size, &desc_version);
- if (status == EFI_BUFFER_TOO_SMALL ||
- !mmap_has_headroom(*map->buff_size, *map->map_size,
- *map->desc_size)) {
- efi_call_early(free_pool, m);
- /*
- * Make sure there is some entries of headroom so that the
- * buffer can be reused for a new map after allocations are
- * no longer permitted. Its unlikely that the map will grow to
- * exceed this headroom once we are ready to trigger
- * ExitBootServices()
- */
- *map->map_size += *map->desc_size * EFI_MMAP_NR_SLACK_SLOTS;
- *map->buff_size = *map->map_size;
- goto again;
- }
-
- if (status != EFI_SUCCESS)
- efi_call_early(free_pool, m);
-
- if (map->key_ptr && status == EFI_SUCCESS)
- *map->key_ptr = key;
- if (map->desc_ver && status == EFI_SUCCESS)
- *map->desc_ver = desc_version;
-
-fail:
- *map->map = m;
- return status;
-}
-
-
-unsigned long get_dram_base(efi_system_table_t *sys_table_arg)
-{
- efi_status_t status;
- unsigned long map_size, buff_size;
- unsigned long membase = EFI_ERROR;
- struct efi_memory_map map;
- efi_memory_desc_t *md;
- struct efi_boot_memmap boot_map;
-
- boot_map.map = (efi_memory_desc_t **)&map.map;
- boot_map.map_size = &map_size;
- boot_map.desc_size = &map.desc_size;
- boot_map.desc_ver = NULL;
- boot_map.key_ptr = NULL;
- boot_map.buff_size = &buff_size;
-
- status = efi_get_memory_map(sys_table_arg, &boot_map);
- if (status != EFI_SUCCESS)
- return membase;
-
- map.map_end = map.map + map_size;
-
- for_each_efi_memory_desc_in_map(&map, md) {
- if (md->attribute & EFI_MEMORY_WB) {
- if (membase > md->phys_addr)
- membase = md->phys_addr;
- }
- }
-
- efi_call_early(free_pool, map.map);
-
- return membase;
-}
-
-/*
- * Allocate at the highest possible address that is not above 'max'.
- */
-efi_status_t efi_high_alloc(efi_system_table_t *sys_table_arg,
- unsigned long size, unsigned long align,
- unsigned long *addr, unsigned long max)
-{
- unsigned long map_size, desc_size, buff_size;
- efi_memory_desc_t *map;
- efi_status_t status;
- unsigned long nr_pages;
- u64 max_addr = 0;
- int i;
- struct efi_boot_memmap boot_map;
-
- boot_map.map = ↦
- boot_map.map_size = &map_size;
- boot_map.desc_size = &desc_size;
- boot_map.desc_ver = NULL;
- boot_map.key_ptr = NULL;
- boot_map.buff_size = &buff_size;
-
- status = efi_get_memory_map(sys_table_arg, &boot_map);
- if (status != EFI_SUCCESS)
- goto fail;
-
+ c0 = cx = *(*s8)++;
/*
- * Enforce minimum alignment that EFI or Linux requires when
- * requesting a specific address. We are doing page-based (or
- * larger) allocations, and both the address and size must meet
- * alignment constraints.
+ * The position of the most-significant 0 bit gives us the length of
+ * a multi-octet encoding.
*/
- if (align < EFI_ALLOC_ALIGN)
- align = EFI_ALLOC_ALIGN;
-
- size = round_up(size, EFI_ALLOC_ALIGN);
- nr_pages = size / EFI_PAGE_SIZE;
-again:
- for (i = 0; i < map_size / desc_size; i++) {
- efi_memory_desc_t *desc;
- unsigned long m = (unsigned long)map;
- u64 start, end;
-
- desc = efi_early_memdesc_ptr(m, desc_size, i);
- if (desc->type != EFI_CONVENTIONAL_MEMORY)
- continue;
-
- if (desc->num_pages < nr_pages)
- continue;
-
- start = desc->phys_addr;
- end = start + desc->num_pages * EFI_PAGE_SIZE;
-
- if (end > max)
- end = max;
-
- if ((start + size) > end)
- continue;
-
- if (round_down(end - size, align) < start)
- continue;
-
- start = round_down(end - size, align);
-
- /*
- * Don't allocate at 0x0. It will confuse code that
- * checks pointers against NULL.
- */
- if (start == 0x0)
- continue;
-
- if (start > max_addr)
- max_addr = start;
- }
-
- if (!max_addr)
- status = EFI_NOT_FOUND;
- else {
- status = efi_call_early(allocate_pages,
- EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA,
- nr_pages, &max_addr);
- if (status != EFI_SUCCESS) {
- max = max_addr;
- max_addr = 0;
- goto again;
- }
-
- *addr = max_addr;
- }
-
- efi_call_early(free_pool, map);
-fail:
- return status;
-}
-
-/*
- * Allocate at the lowest possible address that is not below 'min'.
- */
-efi_status_t efi_low_alloc_above(efi_system_table_t *sys_table_arg,
- unsigned long size, unsigned long align,
- unsigned long *addr, unsigned long min)
-{
- unsigned long map_size, desc_size, buff_size;
- efi_memory_desc_t *map;
- efi_status_t status;
- unsigned long nr_pages;
- int i;
- struct efi_boot_memmap boot_map;
-
- boot_map.map = ↦
- boot_map.map_size = &map_size;
- boot_map.desc_size = &desc_size;
- boot_map.desc_ver = NULL;
- boot_map.key_ptr = NULL;
- boot_map.buff_size = &buff_size;
-
- status = efi_get_memory_map(sys_table_arg, &boot_map);
- if (status != EFI_SUCCESS)
- goto fail;
-
+ for (clen = 0; cx & 0x80; ++clen)
+ cx <<= 1;
/*
- * Enforce minimum alignment that EFI or Linux requires when
- * requesting a specific address. We are doing page-based (or
- * larger) allocations, and both the address and size must meet
- * alignment constraints.
+ * If the 0 bit is in position 8, this is a valid single-octet
+ * encoding. If the 0 bit is in position 7 or positions 1-3, the
+ * encoding is invalid.
+ * In either case, we just return the first octet.
*/
- if (align < EFI_ALLOC_ALIGN)
- align = EFI_ALLOC_ALIGN;
+ if (clen < 2 || clen > 4)
+ return c0;
+ /* Get the bits from the first octet. */
+ c32 = cx >> clen--;
+ for (i = 0; i < clen; ++i) {
+ /* Trailing octets must have 10 in most significant bits. */
+ cx = (*s8)[i] ^ 0x80;
+ if (cx & 0xc0)
+ return c0;
+ c32 = (c32 << 6) | cx;
+ }
+ /*
+ * Check for validity:
+ * - The character must be in the Unicode range.
+ * - It must not be a surrogate.
+ * - It must be encoded using the correct number of octets.
+ */
+ if (c32 > 0x10ffff ||
+ (c32 & 0xf800) == 0xd800 ||
+ clen != (c32 >= 0x80) + (c32 >= 0x800) + (c32 >= 0x10000))
+ return c0;
+ *s8 += clen;
+ return c32;
+}
- size = round_up(size, EFI_ALLOC_ALIGN);
- nr_pages = size / EFI_PAGE_SIZE;
- for (i = 0; i < map_size / desc_size; i++) {
- efi_memory_desc_t *desc;
- unsigned long m = (unsigned long)map;
- u64 start, end;
+/**
+ * efi_puts() - Write a UTF-8 encoded string to the console
+ * @str: UTF-8 encoded string
+ */
+void efi_puts(const char *str)
+{
+ efi_char16_t buf[128];
+ size_t pos = 0, lim = ARRAY_SIZE(buf);
+ const u8 *s8 = (const u8 *)str;
+ u32 c32;
- desc = efi_early_memdesc_ptr(m, desc_size, i);
-
- if (desc->type != EFI_CONVENTIONAL_MEMORY)
- continue;
-
- if (desc->num_pages < nr_pages)
- continue;
-
- start = desc->phys_addr;
- end = start + desc->num_pages * EFI_PAGE_SIZE;
-
- if (start < min)
- start = min;
-
- start = round_up(start, align);
- if ((start + size) > end)
- continue;
-
- status = efi_call_early(allocate_pages,
- EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA,
- nr_pages, &start);
- if (status == EFI_SUCCESS) {
- *addr = start;
- break;
+ while (*s8) {
+ if (*s8 == '\n')
+ buf[pos++] = L'\r';
+ c32 = utf8_to_utf32(&s8);
+ if (c32 < 0x10000) {
+ /* Characters in plane 0 use a single word. */
+ buf[pos++] = c32;
+ } else {
+ /*
+ * Characters in other planes encode into a surrogate
+ * pair.
+ */
+ buf[pos++] = (0xd800 - (0x10000 >> 10)) + (c32 >> 10);
+ buf[pos++] = 0xdc00 + (c32 & 0x3ff);
+ }
+ if (*s8 == '\0' || pos >= lim - 2) {
+ buf[pos] = L'\0';
+ efi_char16_puts(buf);
+ pos = 0;
}
}
-
- if (i == map_size / desc_size)
- status = EFI_NOT_FOUND;
-
- efi_call_early(free_pool, map);
-fail:
- return status;
}
-void efi_free(efi_system_table_t *sys_table_arg, unsigned long size,
- unsigned long addr)
+/**
+ * efi_printk() - Print a kernel message
+ * @fmt: format string
+ *
+ * The first letter of the format string is used to determine the logging level
+ * of the message. If the level is less then the current EFI logging level, the
+ * message is suppressed. The message will be truncated to 255 bytes.
+ *
+ * Return: number of printed characters
+ */
+int efi_printk(const char *fmt, ...)
{
- unsigned long nr_pages;
+ char printf_buf[256];
+ va_list args;
+ int printed;
+ int loglevel = printk_get_level(fmt);
- if (!size)
- return;
-
- nr_pages = round_up(size, EFI_ALLOC_ALIGN) / EFI_PAGE_SIZE;
- efi_call_early(free_pages, addr, nr_pages);
-}
-
-static efi_status_t efi_file_size(efi_system_table_t *sys_table_arg, void *__fh,
- efi_char16_t *filename_16, void **handle,
- u64 *file_sz)
-{
- efi_file_handle_t *h, *fh = __fh;
- efi_file_info_t *info;
- efi_status_t status;
- efi_guid_t info_guid = EFI_FILE_INFO_ID;
- unsigned long info_sz;
-
- status = efi_call_proto(efi_file_handle, open, fh, &h, filename_16,
- EFI_FILE_MODE_READ, (u64)0);
- if (status != EFI_SUCCESS) {
- efi_printk(sys_table_arg, "Failed to open file: ");
- efi_char16_printk(sys_table_arg, filename_16);
- efi_printk(sys_table_arg, "\n");
- return status;
+ switch (loglevel) {
+ case '0' ... '9':
+ loglevel -= '0';
+ break;
+ default:
+ /*
+ * Use loglevel -1 for cases where we just want to print to
+ * the screen.
+ */
+ loglevel = -1;
+ break;
}
- *handle = h;
+ if (loglevel >= efi_loglevel)
+ return 0;
- info_sz = 0;
- status = efi_call_proto(efi_file_handle, get_info, h, &info_guid,
- &info_sz, NULL);
- if (status != EFI_BUFFER_TOO_SMALL) {
- efi_printk(sys_table_arg, "Failed to get file info size\n");
- return status;
+ if (loglevel >= 0)
+ efi_puts("EFI stub: ");
+
+ fmt = printk_skip_level(fmt);
+
+ va_start(args, fmt);
+ printed = vsnprintf(printf_buf, sizeof(printf_buf), fmt, args);
+ va_end(args);
+
+ efi_puts(printf_buf);
+ if (printed >= sizeof(printf_buf)) {
+ efi_puts("[Message truncated]\n");
+ return -1;
}
-grow:
- status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
- info_sz, (void **)&info);
- if (status != EFI_SUCCESS) {
- efi_printk(sys_table_arg, "Failed to alloc mem for file info\n");
- return status;
- }
-
- status = efi_call_proto(efi_file_handle, get_info, h, &info_guid,
- &info_sz, info);
- if (status == EFI_BUFFER_TOO_SMALL) {
- efi_call_early(free_pool, info);
- goto grow;
- }
-
- *file_sz = info->file_size;
- efi_call_early(free_pool, info);
-
- if (status != EFI_SUCCESS)
- efi_printk(sys_table_arg, "Failed to get initrd info\n");
-
- return status;
+ return printed;
}
-static efi_status_t efi_file_read(void *handle, unsigned long *size, void *addr)
-{
- return efi_call_proto(efi_file_handle, read, handle, size, addr);
-}
-
-static efi_status_t efi_file_close(void *handle)
-{
- return efi_call_proto(efi_file_handle, close, handle);
-}
-
-static efi_status_t efi_open_volume(efi_system_table_t *sys_table_arg,
- efi_loaded_image_t *image,
- efi_file_handle_t **__fh)
-{
- efi_file_io_interface_t *io;
- efi_file_handle_t *fh;
- efi_guid_t fs_proto = EFI_FILE_SYSTEM_GUID;
- efi_status_t status;
- void *handle = (void *)(unsigned long)efi_table_attr(efi_loaded_image,
- device_handle,
- image);
-
- status = efi_call_early(handle_protocol, handle,
- &fs_proto, (void **)&io);
- if (status != EFI_SUCCESS) {
- efi_printk(sys_table_arg, "Failed to handle fs_proto\n");
- return status;
- }
-
- status = efi_call_proto(efi_file_io_interface, open_volume, io, &fh);
- if (status != EFI_SUCCESS)
- efi_printk(sys_table_arg, "Failed to open volume\n");
- else
- *__fh = fh;
-
- return status;
-}
-
-/*
- * Parse the ASCII string 'cmdline' for EFI options, denoted by the efi=
+/**
+ * efi_parse_options() - Parse EFI command line options
+ * @cmdline: kernel command line
+ *
+ * Parse the ASCII string @cmdline for EFI options, denoted by the efi=
* option, e.g. efi=nochunk.
*
* It should be noted that efi= is parsed in two very different
* environments, first in the early boot environment of the EFI boot
* stub, and subsequently during the kernel boot.
+ *
+ * Return: status code
*/
efi_status_t efi_parse_options(char const *cmdline)
{
- char *str;
+ size_t len;
+ efi_status_t status;
+ char *str, *buf;
- str = strstr(cmdline, "nokaslr");
- if (str == cmdline || (str && str > cmdline && *(str - 1) == ' '))
- __nokaslr = 1;
-
- str = strstr(cmdline, "quiet");
- if (str == cmdline || (str && str > cmdline && *(str - 1) == ' '))
- __quiet = 1;
-
- /*
- * If no EFI parameters were specified on the cmdline we've got
- * nothing to do.
- */
- str = strstr(cmdline, "efi=");
- if (!str)
+ if (!cmdline)
return EFI_SUCCESS;
- /* Skip ahead to first argument */
- str += strlen("efi=");
+ len = strnlen(cmdline, COMMAND_LINE_SIZE - 1) + 1;
+ status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, len, (void **)&buf);
+ if (status != EFI_SUCCESS)
+ return status;
- /*
- * Remember, because efi= is also used by the kernel we need to
- * skip over arguments we don't understand.
- */
- while (*str && *str != ' ') {
- if (!strncmp(str, "nochunk", 7)) {
- str += strlen("nochunk");
- __chunk_size = -1UL;
+ memcpy(buf, cmdline, len - 1);
+ buf[len - 1] = '\0';
+ str = skip_spaces(buf);
+
+ while (*str) {
+ char *param, *val;
+
+ str = next_arg(str, ¶m, &val);
+ if (!val && !strcmp(param, "--"))
+ break;
+
+ if (!strcmp(param, "nokaslr")) {
+ efi_nokaslr = true;
+ } else if (!strcmp(param, "quiet")) {
+ efi_loglevel = CONSOLE_LOGLEVEL_QUIET;
+ } else if (!strcmp(param, "noinitrd")) {
+ efi_noinitrd = true;
+ } else if (!strcmp(param, "efi") && val) {
+ efi_nochunk = parse_option_str(val, "nochunk");
+ efi_novamap = parse_option_str(val, "novamap");
+
+ efi_nosoftreserve = IS_ENABLED(CONFIG_EFI_SOFT_RESERVE) &&
+ parse_option_str(val, "nosoftreserve");
+
+ if (parse_option_str(val, "disable_early_pci_dma"))
+ efi_disable_pci_dma = true;
+ if (parse_option_str(val, "no_disable_early_pci_dma"))
+ efi_disable_pci_dma = false;
+ if (parse_option_str(val, "debug"))
+ efi_loglevel = CONSOLE_LOGLEVEL_DEBUG;
+ } else if (!strcmp(param, "video") &&
+ val && strstarts(val, "efifb:")) {
+ efi_parse_option_graphics(val + strlen("efifb:"));
}
-
- if (!strncmp(str, "novamap", 7)) {
- str += strlen("novamap");
- __novamap = 1;
- }
-
- /* Group words together, delimited by "," */
- while (*str && *str != ' ' && *str != ',')
- str++;
-
- if (*str == ',')
- str++;
}
-
+ efi_bs_call(free_pool, buf);
return EFI_SUCCESS;
}
/*
- * Check the cmdline for a LILO-style file= arguments.
+ * The EFI_LOAD_OPTION descriptor has the following layout:
+ * u32 Attributes;
+ * u16 FilePathListLength;
+ * u16 Description[];
+ * efi_device_path_protocol_t FilePathList[];
+ * u8 OptionalData[];
*
- * We only support loading a file from the same filesystem as
- * the kernel image.
+ * This function validates and unpacks the variable-size data fields.
*/
-efi_status_t handle_cmdline_files(efi_system_table_t *sys_table_arg,
- efi_loaded_image_t *image,
- char *cmd_line, char *option_string,
- unsigned long max_addr,
- unsigned long *load_addr,
- unsigned long *load_size)
+static
+bool efi_load_option_unpack(efi_load_option_unpacked_t *dest,
+ const efi_load_option_t *src, size_t size)
{
- struct file_info *files;
- unsigned long file_addr;
- u64 file_size_total;
- efi_file_handle_t *fh = NULL;
- efi_status_t status;
- int nr_files;
- char *str;
- int i, j, k;
+ const void *pos;
+ u16 c;
+ efi_device_path_protocol_t header;
+ const efi_char16_t *description;
+ const efi_device_path_protocol_t *file_path_list;
- file_addr = 0;
- file_size_total = 0;
+ if (size < offsetof(efi_load_option_t, variable_data))
+ return false;
+ pos = src->variable_data;
+ size -= offsetof(efi_load_option_t, variable_data);
- str = cmd_line;
+ if ((src->attributes & ~EFI_LOAD_OPTION_MASK) != 0)
+ return false;
- j = 0; /* See close_handles */
+ /* Scan description. */
+ description = pos;
+ do {
+ if (size < sizeof(c))
+ return false;
+ c = *(const u16 *)pos;
+ pos += sizeof(c);
+ size -= sizeof(c);
+ } while (c != L'\0');
- if (!load_addr || !load_size)
- return EFI_INVALID_PARAMETER;
+ /* Scan file_path_list. */
+ file_path_list = pos;
+ do {
+ if (size < sizeof(header))
+ return false;
+ header = *(const efi_device_path_protocol_t *)pos;
+ if (header.length < sizeof(header))
+ return false;
+ if (size < header.length)
+ return false;
+ pos += header.length;
+ size -= header.length;
+ } while ((header.type != EFI_DEV_END_PATH && header.type != EFI_DEV_END_PATH2) ||
+ (header.sub_type != EFI_DEV_END_ENTIRE));
+ if (pos != (const void *)file_path_list + src->file_path_list_length)
+ return false;
- *load_addr = 0;
- *load_size = 0;
+ dest->attributes = src->attributes;
+ dest->file_path_list_length = src->file_path_list_length;
+ dest->description = description;
+ dest->file_path_list = file_path_list;
+ dest->optional_data_size = size;
+ dest->optional_data = size ? pos : NULL;
- if (!str || !*str)
- return EFI_SUCCESS;
-
- for (nr_files = 0; *str; nr_files++) {
- str = strstr(str, option_string);
- if (!str)
- break;
-
- str += strlen(option_string);
-
- /* Skip any leading slashes */
- while (*str == '/' || *str == '\\')
- str++;
-
- while (*str && *str != ' ' && *str != '\n')
- str++;
- }
-
- if (!nr_files)
- return EFI_SUCCESS;
-
- status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
- nr_files * sizeof(*files), (void **)&files);
- if (status != EFI_SUCCESS) {
- pr_efi_err(sys_table_arg, "Failed to alloc mem for file handle list\n");
- goto fail;
- }
-
- str = cmd_line;
- for (i = 0; i < nr_files; i++) {
- struct file_info *file;
- efi_char16_t filename_16[256];
- efi_char16_t *p;
-
- str = strstr(str, option_string);
- if (!str)
- break;
-
- str += strlen(option_string);
-
- file = &files[i];
- p = filename_16;
-
- /* Skip any leading slashes */
- while (*str == '/' || *str == '\\')
- str++;
-
- while (*str && *str != ' ' && *str != '\n') {
- if ((u8 *)p >= (u8 *)filename_16 + sizeof(filename_16))
- break;
-
- if (*str == '/') {
- *p++ = '\\';
- str++;
- } else {
- *p++ = *str++;
- }
- }
-
- *p = '\0';
-
- /* Only open the volume once. */
- if (!i) {
- status = efi_open_volume(sys_table_arg, image, &fh);
- if (status != EFI_SUCCESS)
- goto free_files;
- }
-
- status = efi_file_size(sys_table_arg, fh, filename_16,
- (void **)&file->handle, &file->size);
- if (status != EFI_SUCCESS)
- goto close_handles;
-
- file_size_total += file->size;
- }
-
- if (file_size_total) {
- unsigned long addr;
-
- /*
- * Multiple files need to be at consecutive addresses in memory,
- * so allocate enough memory for all the files. This is used
- * for loading multiple files.
- */
- status = efi_high_alloc(sys_table_arg, file_size_total, 0x1000,
- &file_addr, max_addr);
- if (status != EFI_SUCCESS) {
- pr_efi_err(sys_table_arg, "Failed to alloc highmem for files\n");
- goto close_handles;
- }
-
- /* We've run out of free low memory. */
- if (file_addr > max_addr) {
- pr_efi_err(sys_table_arg, "We've run out of free low memory\n");
- status = EFI_INVALID_PARAMETER;
- goto free_file_total;
- }
-
- addr = file_addr;
- for (j = 0; j < nr_files; j++) {
- unsigned long size;
-
- size = files[j].size;
- while (size) {
- unsigned long chunksize;
-
- if (IS_ENABLED(CONFIG_X86) && size > __chunk_size)
- chunksize = __chunk_size;
- else
- chunksize = size;
-
- status = efi_file_read(files[j].handle,
- &chunksize,
- (void *)addr);
- if (status != EFI_SUCCESS) {
- pr_efi_err(sys_table_arg, "Failed to read file\n");
- goto free_file_total;
- }
- addr += chunksize;
- size -= chunksize;
- }
-
- efi_file_close(files[j].handle);
- }
-
- }
-
- efi_call_early(free_pool, files);
-
- *load_addr = file_addr;
- *load_size = file_size_total;
-
- return status;
-
-free_file_total:
- efi_free(sys_table_arg, file_size_total, file_addr);
-
-close_handles:
- for (k = j; k < i; k++)
- efi_file_close(files[k].handle);
-free_files:
- efi_call_early(free_pool, files);
-fail:
- *load_addr = 0;
- *load_size = 0;
-
- return status;
-}
-/*
- * Relocate a kernel image, either compressed or uncompressed.
- * In the ARM64 case, all kernel images are currently
- * uncompressed, and as such when we relocate it we need to
- * allocate additional space for the BSS segment. Any low
- * memory that this function should avoid needs to be
- * unavailable in the EFI memory map, as if the preferred
- * address is not available the lowest available address will
- * be used.
- */
-efi_status_t efi_relocate_kernel(efi_system_table_t *sys_table_arg,
- unsigned long *image_addr,
- unsigned long image_size,
- unsigned long alloc_size,
- unsigned long preferred_addr,
- unsigned long alignment,
- unsigned long min_addr)
-{
- unsigned long cur_image_addr;
- unsigned long new_addr = 0;
- efi_status_t status;
- unsigned long nr_pages;
- efi_physical_addr_t efi_addr = preferred_addr;
-
- if (!image_addr || !image_size || !alloc_size)
- return EFI_INVALID_PARAMETER;
- if (alloc_size < image_size)
- return EFI_INVALID_PARAMETER;
-
- cur_image_addr = *image_addr;
-
- /*
- * The EFI firmware loader could have placed the kernel image
- * anywhere in memory, but the kernel has restrictions on the
- * max physical address it can run at. Some architectures
- * also have a prefered address, so first try to relocate
- * to the preferred address. If that fails, allocate as low
- * as possible while respecting the required alignment.
- */
- nr_pages = round_up(alloc_size, EFI_ALLOC_ALIGN) / EFI_PAGE_SIZE;
- status = efi_call_early(allocate_pages,
- EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA,
- nr_pages, &efi_addr);
- new_addr = efi_addr;
- /*
- * If preferred address allocation failed allocate as low as
- * possible.
- */
- if (status != EFI_SUCCESS) {
- status = efi_low_alloc_above(sys_table_arg, alloc_size,
- alignment, &new_addr, min_addr);
- }
- if (status != EFI_SUCCESS) {
- pr_efi_err(sys_table_arg, "Failed to allocate usable memory for kernel.\n");
- return status;
- }
-
- /*
- * We know source/dest won't overlap since both memory ranges
- * have been allocated by UEFI, so we can safely use memcpy.
- */
- memcpy((void *)new_addr, (void *)cur_image_addr, image_size);
-
- /* Return the new address of the relocated image. */
- *image_addr = new_addr;
-
- return status;
+ return true;
}
/*
- * Get the number of UTF-8 bytes corresponding to an UTF-16 character.
- * This overestimates for surrogates, but that is okay.
+ * At least some versions of Dell firmware pass the entire contents of the
+ * Boot#### variable, i.e. the EFI_LOAD_OPTION descriptor, rather than just the
+ * OptionalData field.
+ *
+ * Detect this case and extract OptionalData.
*/
-static int efi_utf8_bytes(u16 c)
+void efi_apply_loadoptions_quirk(const void **load_options, int *load_options_size)
{
- return 1 + (c >= 0x80) + (c >= 0x800);
+ const efi_load_option_t *load_option = *load_options;
+ efi_load_option_unpacked_t load_option_unpacked;
+
+ if (!IS_ENABLED(CONFIG_X86))
+ return;
+ if (!load_option)
+ return;
+ if (*load_options_size < sizeof(*load_option))
+ return;
+ if ((load_option->attributes & ~EFI_LOAD_OPTION_BOOT_MASK) != 0)
+ return;
+
+ if (!efi_load_option_unpack(&load_option_unpacked, load_option, *load_options_size))
+ return;
+
+ efi_warn_once(FW_BUG "LoadOptions is an EFI_LOAD_OPTION descriptor\n");
+ efi_warn_once(FW_BUG "Using OptionalData as a workaround\n");
+
+ *load_options = load_option_unpacked.optional_data;
+ *load_options_size = load_option_unpacked.optional_data_size;
}
/*
- * Convert an UTF-16 string, not necessarily null terminated, to UTF-8.
- */
-static u8 *efi_utf16_to_utf8(u8 *dst, const u16 *src, int n)
-{
- unsigned int c;
-
- while (n--) {
- c = *src++;
- if (n && c >= 0xd800 && c <= 0xdbff &&
- *src >= 0xdc00 && *src <= 0xdfff) {
- c = 0x10000 + ((c & 0x3ff) << 10) + (*src & 0x3ff);
- src++;
- n--;
- }
- if (c >= 0xd800 && c <= 0xdfff)
- c = 0xfffd; /* Unmatched surrogate */
- if (c < 0x80) {
- *dst++ = c;
- continue;
- }
- if (c < 0x800) {
- *dst++ = 0xc0 + (c >> 6);
- goto t1;
- }
- if (c < 0x10000) {
- *dst++ = 0xe0 + (c >> 12);
- goto t2;
- }
- *dst++ = 0xf0 + (c >> 18);
- *dst++ = 0x80 + ((c >> 12) & 0x3f);
- t2:
- *dst++ = 0x80 + ((c >> 6) & 0x3f);
- t1:
- *dst++ = 0x80 + (c & 0x3f);
- }
-
- return dst;
-}
-
-#ifndef MAX_CMDLINE_ADDRESS
-#define MAX_CMDLINE_ADDRESS ULONG_MAX
-#endif
-
-/*
* Convert the unicode UEFI command line to ASCII to pass to kernel.
* Size of memory allocated return in *cmd_line_len.
* Returns NULL on error.
*/
-char *efi_convert_cmdline(efi_system_table_t *sys_table_arg,
- efi_loaded_image_t *image,
- int *cmd_line_len)
+char *efi_convert_cmdline(efi_loaded_image_t *image, int *cmd_line_len)
{
const u16 *s2;
- u8 *s1 = NULL;
unsigned long cmdline_addr = 0;
- int load_options_chars = image->load_options_size / 2; /* UTF-16 */
- const u16 *options = image->load_options;
- int options_bytes = 0; /* UTF-8 bytes */
- int options_chars = 0; /* UTF-16 chars */
+ int options_chars = efi_table_attr(image, load_options_size);
+ const u16 *options = efi_table_attr(image, load_options);
+ int options_bytes = 0, safe_options_bytes = 0; /* UTF-8 bytes */
+ bool in_quote = false;
efi_status_t status;
- u16 zero = 0;
+
+ efi_apply_loadoptions_quirk((const void **)&options, &options_chars);
+ options_chars /= sizeof(*options);
if (options) {
s2 = options;
- while (*s2 && *s2 != '\n'
- && options_chars < load_options_chars) {
- options_bytes += efi_utf8_bytes(*s2++);
- options_chars++;
- }
- }
+ while (options_bytes < COMMAND_LINE_SIZE && options_chars--) {
+ u16 c = *s2++;
- if (!options_chars) {
- /* No command line options, so return empty string*/
- options = &zero;
+ if (c < 0x80) {
+ if (c == L'\0' || c == L'\n')
+ break;
+ if (c == L'"')
+ in_quote = !in_quote;
+ else if (!in_quote && isspace((char)c))
+ safe_options_bytes = options_bytes;
+
+ options_bytes++;
+ continue;
+ }
+
+ /*
+ * Get the number of UTF-8 bytes corresponding to a
+ * UTF-16 character.
+ * The first part handles everything in the BMP.
+ */
+ options_bytes += 2 + (c >= 0x800);
+ /*
+ * Add one more byte for valid surrogate pairs. Invalid
+ * surrogates will be replaced with 0xfffd and take up
+ * only 3 bytes.
+ */
+ if ((c & 0xfc00) == 0xd800) {
+ /*
+ * If the very last word is a high surrogate,
+ * we must ignore it since we can't access the
+ * low surrogate.
+ */
+ if (!options_chars) {
+ options_bytes -= 3;
+ } else if ((*s2 & 0xfc00) == 0xdc00) {
+ options_bytes++;
+ options_chars--;
+ s2++;
+ }
+ }
+ }
+ if (options_bytes >= COMMAND_LINE_SIZE) {
+ options_bytes = safe_options_bytes;
+ efi_err("Command line is too long: truncated to %d bytes\n",
+ options_bytes);
+ }
}
options_bytes++; /* NUL termination */
- status = efi_high_alloc(sys_table_arg, options_bytes, 0,
- &cmdline_addr, MAX_CMDLINE_ADDRESS);
+ status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, options_bytes,
+ (void **)&cmdline_addr);
if (status != EFI_SUCCESS)
return NULL;
- s1 = (u8 *)cmdline_addr;
- s2 = (const u16 *)options;
-
- s1 = efi_utf16_to_utf8(s1, s2, options_chars);
- *s1 = '\0';
+ snprintf((char *)cmdline_addr, options_bytes, "%.*ls",
+ options_bytes - 1, options);
*cmd_line_len = options_bytes;
return (char *)cmdline_addr;
}
-/*
+/**
+ * efi_exit_boot_services() - Exit boot services
+ * @handle: handle of the exiting image
+ * @map: pointer to receive the memory map
+ * @priv: argument to be passed to @priv_func
+ * @priv_func: function to process the memory map before exiting boot services
+ *
* Handle calling ExitBootServices according to the requirements set out by the
* spec. Obtains the current memory map, and returns that info after calling
* ExitBootServices. The client must specify a function to perform any
* processing of the memory map data prior to ExitBootServices. A client
* specific structure may be passed to the function via priv. The client
* function may be called multiple times.
+ *
+ * Return: status code
*/
-efi_status_t efi_exit_boot_services(efi_system_table_t *sys_table_arg,
- void *handle,
+efi_status_t efi_exit_boot_services(void *handle,
struct efi_boot_memmap *map,
void *priv,
efi_exit_boot_map_processing priv_func)
{
efi_status_t status;
- status = efi_get_memory_map(sys_table_arg, map);
+ status = efi_get_memory_map(map);
if (status != EFI_SUCCESS)
goto fail;
- status = priv_func(sys_table_arg, map, priv);
+ status = priv_func(map, priv);
if (status != EFI_SUCCESS)
goto free_map;
- status = efi_call_early(exit_boot_services, handle, *map->key_ptr);
+ if (efi_disable_pci_dma)
+ efi_pci_disable_bridge_busmaster();
+
+ status = efi_bs_call(exit_boot_services, handle, *map->key_ptr);
if (status == EFI_INVALID_PARAMETER) {
/*
@@ -892,23 +468,23 @@
* to get_memory_map() is expected to succeed here.
*/
*map->map_size = *map->buff_size;
- status = efi_call_early(get_memory_map,
- map->map_size,
- *map->map,
- map->key_ptr,
- map->desc_size,
- map->desc_ver);
+ status = efi_bs_call(get_memory_map,
+ map->map_size,
+ *map->map,
+ map->key_ptr,
+ map->desc_size,
+ map->desc_ver);
/* exit_boot_services() was called, thus cannot free */
if (status != EFI_SUCCESS)
goto fail;
- status = priv_func(sys_table_arg, map, priv);
+ status = priv_func(map, priv);
/* exit_boot_services() was called, thus cannot free */
if (status != EFI_SUCCESS)
goto fail;
- status = efi_call_early(exit_boot_services, handle, *map->key_ptr);
+ status = efi_bs_call(exit_boot_services, handle, *map->key_ptr);
}
/* exit_boot_services() was called, thus cannot free */
@@ -918,38 +494,211 @@
return EFI_SUCCESS;
free_map:
- efi_call_early(free_pool, *map->map);
+ efi_bs_call(free_pool, *map->map);
fail:
return status;
}
-#define GET_EFI_CONFIG_TABLE(bits) \
-static void *get_efi_config_table##bits(efi_system_table_t *_sys_table, \
- efi_guid_t guid) \
-{ \
- efi_system_table_##bits##_t *sys_table; \
- efi_config_table_##bits##_t *tables; \
- int i; \
- \
- sys_table = (typeof(sys_table))_sys_table; \
- tables = (typeof(tables))(unsigned long)sys_table->tables; \
- \
- for (i = 0; i < sys_table->nr_tables; i++) { \
- if (efi_guidcmp(tables[i].guid, guid) != 0) \
- continue; \
- \
- return (void *)(unsigned long)tables[i].table; \
- } \
- \
- return NULL; \
-}
-GET_EFI_CONFIG_TABLE(32)
-GET_EFI_CONFIG_TABLE(64)
-
-void *get_efi_config_table(efi_system_table_t *sys_table, efi_guid_t guid)
+/**
+ * get_efi_config_table() - retrieve UEFI configuration table
+ * @guid: GUID of the configuration table to be retrieved
+ * Return: pointer to the configuration table or NULL
+ */
+void *get_efi_config_table(efi_guid_t guid)
{
- if (efi_is_64bit())
- return get_efi_config_table64(sys_table, guid);
- else
- return get_efi_config_table32(sys_table, guid);
+ unsigned long tables = efi_table_attr(efi_system_table, tables);
+ int nr_tables = efi_table_attr(efi_system_table, nr_tables);
+ int i;
+
+ for (i = 0; i < nr_tables; i++) {
+ efi_config_table_t *t = (void *)tables;
+
+ if (efi_guidcmp(t->guid, guid) == 0)
+ return efi_table_attr(t, table);
+
+ tables += efi_is_native() ? sizeof(efi_config_table_t)
+ : sizeof(efi_config_table_32_t);
+ }
+ return NULL;
+}
+
+/*
+ * The LINUX_EFI_INITRD_MEDIA_GUID vendor media device path below provides a way
+ * for the firmware or bootloader to expose the initrd data directly to the stub
+ * via the trivial LoadFile2 protocol, which is defined in the UEFI spec, and is
+ * very easy to implement. It is a simple Linux initrd specific conduit between
+ * kernel and firmware, allowing us to put the EFI stub (being part of the
+ * kernel) in charge of where and when to load the initrd, while leaving it up
+ * to the firmware to decide whether it needs to expose its filesystem hierarchy
+ * via EFI protocols.
+ */
+static const struct {
+ struct efi_vendor_dev_path vendor;
+ struct efi_generic_dev_path end;
+} __packed initrd_dev_path = {
+ {
+ {
+ EFI_DEV_MEDIA,
+ EFI_DEV_MEDIA_VENDOR,
+ sizeof(struct efi_vendor_dev_path),
+ },
+ LINUX_EFI_INITRD_MEDIA_GUID
+ }, {
+ EFI_DEV_END_PATH,
+ EFI_DEV_END_ENTIRE,
+ sizeof(struct efi_generic_dev_path)
+ }
+};
+
+/**
+ * efi_load_initrd_dev_path() - load the initrd from the Linux initrd device path
+ * @load_addr: pointer to store the address where the initrd was loaded
+ * @load_size: pointer to store the size of the loaded initrd
+ * @max: upper limit for the initrd memory allocation
+ *
+ * Return:
+ * * %EFI_SUCCESS if the initrd was loaded successfully, in which
+ * case @load_addr and @load_size are assigned accordingly
+ * * %EFI_NOT_FOUND if no LoadFile2 protocol exists on the initrd device path
+ * * %EFI_INVALID_PARAMETER if load_addr == NULL or load_size == NULL
+ * * %EFI_OUT_OF_RESOURCES if memory allocation failed
+ * * %EFI_LOAD_ERROR in all other cases
+ */
+static
+efi_status_t efi_load_initrd_dev_path(unsigned long *load_addr,
+ unsigned long *load_size,
+ unsigned long max)
+{
+ efi_guid_t lf2_proto_guid = EFI_LOAD_FILE2_PROTOCOL_GUID;
+ efi_device_path_protocol_t *dp;
+ efi_load_file2_protocol_t *lf2;
+ unsigned long initrd_addr;
+ unsigned long initrd_size;
+ efi_handle_t handle;
+ efi_status_t status;
+
+ dp = (efi_device_path_protocol_t *)&initrd_dev_path;
+ status = efi_bs_call(locate_device_path, &lf2_proto_guid, &dp, &handle);
+ if (status != EFI_SUCCESS)
+ return status;
+
+ status = efi_bs_call(handle_protocol, handle, &lf2_proto_guid,
+ (void **)&lf2);
+ if (status != EFI_SUCCESS)
+ return status;
+
+ status = efi_call_proto(lf2, load_file, dp, false, &initrd_size, NULL);
+ if (status != EFI_BUFFER_TOO_SMALL)
+ return EFI_LOAD_ERROR;
+
+ status = efi_allocate_pages(initrd_size, &initrd_addr, max);
+ if (status != EFI_SUCCESS)
+ return status;
+
+ status = efi_call_proto(lf2, load_file, dp, false, &initrd_size,
+ (void *)initrd_addr);
+ if (status != EFI_SUCCESS) {
+ efi_free(initrd_size, initrd_addr);
+ return EFI_LOAD_ERROR;
+ }
+
+ *load_addr = initrd_addr;
+ *load_size = initrd_size;
+ return EFI_SUCCESS;
+}
+
+static
+efi_status_t efi_load_initrd_cmdline(efi_loaded_image_t *image,
+ unsigned long *load_addr,
+ unsigned long *load_size,
+ unsigned long soft_limit,
+ unsigned long hard_limit)
+{
+ if (!IS_ENABLED(CONFIG_EFI_GENERIC_STUB_INITRD_CMDLINE_LOADER) ||
+ (IS_ENABLED(CONFIG_X86) && (!efi_is_native() || image == NULL))) {
+ *load_addr = *load_size = 0;
+ return EFI_SUCCESS;
+ }
+
+ return handle_cmdline_files(image, L"initrd=", sizeof(L"initrd=") - 2,
+ soft_limit, hard_limit,
+ load_addr, load_size);
+}
+
+/**
+ * efi_load_initrd() - Load initial RAM disk
+ * @image: EFI loaded image protocol
+ * @load_addr: pointer to loaded initrd
+ * @load_size: size of loaded initrd
+ * @soft_limit: preferred size of allocated memory for loading the initrd
+ * @hard_limit: minimum size of allocated memory
+ *
+ * Return: status code
+ */
+efi_status_t efi_load_initrd(efi_loaded_image_t *image,
+ unsigned long *load_addr,
+ unsigned long *load_size,
+ unsigned long soft_limit,
+ unsigned long hard_limit)
+{
+ efi_status_t status;
+
+ if (!load_addr || !load_size)
+ return EFI_INVALID_PARAMETER;
+
+ status = efi_load_initrd_dev_path(load_addr, load_size, hard_limit);
+ if (status == EFI_SUCCESS) {
+ efi_info("Loaded initrd from LINUX_EFI_INITRD_MEDIA_GUID device path\n");
+ } else if (status == EFI_NOT_FOUND) {
+ status = efi_load_initrd_cmdline(image, load_addr, load_size,
+ soft_limit, hard_limit);
+ if (status == EFI_SUCCESS && *load_size > 0)
+ efi_info("Loaded initrd from command line option\n");
+ }
+
+ return status;
+}
+
+/**
+ * efi_wait_for_key() - Wait for key stroke
+ * @usec: number of microseconds to wait for key stroke
+ * @key: key entered
+ *
+ * Wait for up to @usec microseconds for a key stroke.
+ *
+ * Return: status code, EFI_SUCCESS if key received
+ */
+efi_status_t efi_wait_for_key(unsigned long usec, efi_input_key_t *key)
+{
+ efi_event_t events[2], timer;
+ unsigned long index;
+ efi_simple_text_input_protocol_t *con_in;
+ efi_status_t status;
+
+ con_in = efi_table_attr(efi_system_table, con_in);
+ if (!con_in)
+ return EFI_UNSUPPORTED;
+ efi_set_event_at(events, 0, efi_table_attr(con_in, wait_for_key));
+
+ status = efi_bs_call(create_event, EFI_EVT_TIMER, 0, NULL, NULL, &timer);
+ if (status != EFI_SUCCESS)
+ return status;
+
+ status = efi_bs_call(set_timer, timer, EfiTimerRelative,
+ EFI_100NSEC_PER_USEC * usec);
+ if (status != EFI_SUCCESS)
+ return status;
+ efi_set_event_at(events, 1, timer);
+
+ status = efi_bs_call(wait_for_event, 2, events, &index);
+ if (status == EFI_SUCCESS) {
+ if (index == 0)
+ status = efi_call_proto(con_in, read_keystroke, key);
+ else
+ status = EFI_TIMEOUT;
+ }
+
+ efi_bs_call(close_event, timer);
+
+ return status;
}
diff --git a/drivers/firmware/efi/libstub/efi-stub.c b/drivers/firmware/efi/libstub/efi-stub.c
new file mode 100644
index 0000000..0ab439c
--- /dev/null
+++ b/drivers/firmware/efi/libstub/efi-stub.c
@@ -0,0 +1,380 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * EFI stub implementation that is shared by arm and arm64 architectures.
+ * This should be #included by the EFI stub implementation files.
+ *
+ * Copyright (C) 2013,2014 Linaro Limited
+ * Roy Franz <roy.franz@linaro.org
+ * Copyright (C) 2013 Red Hat, Inc.
+ * Mark Salter <msalter@redhat.com>
+ */
+
+#include <linux/efi.h>
+#include <linux/libfdt.h>
+#include <asm/efi.h>
+
+#include "efistub.h"
+
+/*
+ * This is the base address at which to start allocating virtual memory ranges
+ * for UEFI Runtime Services.
+ *
+ * For ARM/ARM64:
+ * This is in the low TTBR0 range so that we can use
+ * any allocation we choose, and eliminate the risk of a conflict after kexec.
+ * The value chosen is the largest non-zero power of 2 suitable for this purpose
+ * both on 32-bit and 64-bit ARM CPUs, to maximize the likelihood that it can
+ * be mapped efficiently.
+ * Since 32-bit ARM could potentially execute with a 1G/3G user/kernel split,
+ * map everything below 1 GB. (512 MB is a reasonable upper bound for the
+ * entire footprint of the UEFI runtime services memory regions)
+ *
+ * For RISC-V:
+ * There is no specific reason for which, this address (512MB) can't be used
+ * EFI runtime virtual address for RISC-V. It also helps to use EFI runtime
+ * services on both RV32/RV64. Keep the same runtime virtual address for RISC-V
+ * as well to minimize the code churn.
+ */
+#define EFI_RT_VIRTUAL_BASE SZ_512M
+#define EFI_RT_VIRTUAL_SIZE SZ_512M
+
+#ifdef CONFIG_ARM64
+# define EFI_RT_VIRTUAL_LIMIT DEFAULT_MAP_WINDOW_64
+#else
+# define EFI_RT_VIRTUAL_LIMIT TASK_SIZE
+#endif
+
+static u64 virtmap_base = EFI_RT_VIRTUAL_BASE;
+static bool flat_va_mapping;
+
+const efi_system_table_t *efi_system_table;
+
+static struct screen_info *setup_graphics(void)
+{
+ efi_guid_t gop_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
+ efi_status_t status;
+ unsigned long size;
+ void **gop_handle = NULL;
+ struct screen_info *si = NULL;
+
+ size = 0;
+ status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL,
+ &gop_proto, NULL, &size, gop_handle);
+ if (status == EFI_BUFFER_TOO_SMALL) {
+ si = alloc_screen_info();
+ if (!si)
+ return NULL;
+ status = efi_setup_gop(si, &gop_proto, size);
+ if (status != EFI_SUCCESS) {
+ free_screen_info(si);
+ return NULL;
+ }
+ }
+ return si;
+}
+
+static void install_memreserve_table(void)
+{
+ struct linux_efi_memreserve *rsv;
+ efi_guid_t memreserve_table_guid = LINUX_EFI_MEMRESERVE_TABLE_GUID;
+ efi_status_t status;
+
+ status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, sizeof(*rsv),
+ (void **)&rsv);
+ if (status != EFI_SUCCESS) {
+ efi_err("Failed to allocate memreserve entry!\n");
+ return;
+ }
+
+ rsv->next = 0;
+ rsv->size = 0;
+ atomic_set(&rsv->count, 0);
+
+ status = efi_bs_call(install_configuration_table,
+ &memreserve_table_guid, rsv);
+ if (status != EFI_SUCCESS)
+ efi_err("Failed to install memreserve config table!\n");
+}
+
+static u32 get_supported_rt_services(void)
+{
+ const efi_rt_properties_table_t *rt_prop_table;
+ u32 supported = EFI_RT_SUPPORTED_ALL;
+
+ rt_prop_table = get_efi_config_table(EFI_RT_PROPERTIES_TABLE_GUID);
+ if (rt_prop_table)
+ supported &= rt_prop_table->runtime_services_supported;
+
+ return supported;
+}
+
+/*
+ * EFI entry point for the arm/arm64 EFI stubs. This is the entrypoint
+ * that is described in the PE/COFF header. Most of the code is the same
+ * for both archictectures, with the arch-specific code provided in the
+ * handle_kernel_image() function.
+ */
+efi_status_t __efiapi efi_pe_entry(efi_handle_t handle,
+ efi_system_table_t *sys_table_arg)
+{
+ efi_loaded_image_t *image;
+ efi_status_t status;
+ unsigned long image_addr;
+ unsigned long image_size = 0;
+ /* addr/point and size pairs for memory management*/
+ unsigned long initrd_addr = 0;
+ unsigned long initrd_size = 0;
+ unsigned long fdt_addr = 0; /* Original DTB */
+ unsigned long fdt_size = 0;
+ char *cmdline_ptr = NULL;
+ int cmdline_size = 0;
+ efi_guid_t loaded_image_proto = LOADED_IMAGE_PROTOCOL_GUID;
+ unsigned long reserve_addr = 0;
+ unsigned long reserve_size = 0;
+ enum efi_secureboot_mode secure_boot;
+ struct screen_info *si;
+ efi_properties_table_t *prop_tbl;
+ unsigned long max_addr;
+
+ efi_system_table = sys_table_arg;
+
+ /* Check if we were booted by the EFI firmware */
+ if (efi_system_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) {
+ status = EFI_INVALID_PARAMETER;
+ goto fail;
+ }
+
+ status = check_platform_features();
+ if (status != EFI_SUCCESS)
+ goto fail;
+
+ /*
+ * Get a handle to the loaded image protocol. This is used to get
+ * information about the running image, such as size and the command
+ * line.
+ */
+ status = efi_system_table->boottime->handle_protocol(handle,
+ &loaded_image_proto, (void *)&image);
+ if (status != EFI_SUCCESS) {
+ efi_err("Failed to get loaded image protocol\n");
+ goto fail;
+ }
+
+ /*
+ * Get the command line from EFI, using the LOADED_IMAGE
+ * protocol. We are going to copy the command line into the
+ * device tree, so this can be allocated anywhere.
+ */
+ cmdline_ptr = efi_convert_cmdline(image, &cmdline_size);
+ if (!cmdline_ptr) {
+ efi_err("getting command line via LOADED_IMAGE_PROTOCOL\n");
+ status = EFI_OUT_OF_RESOURCES;
+ goto fail;
+ }
+
+ if (IS_ENABLED(CONFIG_CMDLINE_EXTEND) ||
+ IS_ENABLED(CONFIG_CMDLINE_FORCE) ||
+ cmdline_size == 0) {
+ status = efi_parse_options(CONFIG_CMDLINE);
+ if (status != EFI_SUCCESS) {
+ efi_err("Failed to parse options\n");
+ goto fail_free_cmdline;
+ }
+ }
+
+ if (!IS_ENABLED(CONFIG_CMDLINE_FORCE) && cmdline_size > 0) {
+ status = efi_parse_options(cmdline_ptr);
+ if (status != EFI_SUCCESS) {
+ efi_err("Failed to parse options\n");
+ goto fail_free_cmdline;
+ }
+ }
+
+ efi_info("Booting Linux Kernel...\n");
+
+ si = setup_graphics();
+
+ status = handle_kernel_image(&image_addr, &image_size,
+ &reserve_addr,
+ &reserve_size,
+ image);
+ if (status != EFI_SUCCESS) {
+ efi_err("Failed to relocate kernel\n");
+ goto fail_free_screeninfo;
+ }
+
+ efi_retrieve_tpm2_eventlog();
+
+ /* Ask the firmware to clear memory on unclean shutdown */
+ efi_enable_reset_attack_mitigation();
+
+ secure_boot = efi_get_secureboot();
+
+ /*
+ * Unauthenticated device tree data is a security hazard, so ignore
+ * 'dtb=' unless UEFI Secure Boot is disabled. We assume that secure
+ * boot is enabled if we can't determine its state.
+ */
+ if (!IS_ENABLED(CONFIG_EFI_ARMSTUB_DTB_LOADER) ||
+ secure_boot != efi_secureboot_mode_disabled) {
+ if (strstr(cmdline_ptr, "dtb="))
+ efi_err("Ignoring DTB from command line.\n");
+ } else {
+ status = efi_load_dtb(image, &fdt_addr, &fdt_size);
+
+ if (status != EFI_SUCCESS) {
+ efi_err("Failed to load device tree!\n");
+ goto fail_free_image;
+ }
+ }
+
+ if (fdt_addr) {
+ efi_info("Using DTB from command line\n");
+ } else {
+ /* Look for a device tree configuration table entry. */
+ fdt_addr = (uintptr_t)get_fdt(&fdt_size);
+ if (fdt_addr)
+ efi_info("Using DTB from configuration table\n");
+ }
+
+ if (!fdt_addr)
+ efi_info("Generating empty DTB\n");
+
+ if (!efi_noinitrd) {
+ max_addr = efi_get_max_initrd_addr(image_addr);
+ status = efi_load_initrd(image, &initrd_addr, &initrd_size,
+ ULONG_MAX, max_addr);
+ if (status != EFI_SUCCESS)
+ efi_err("Failed to load initrd!\n");
+ }
+
+ efi_random_get_seed();
+
+ /*
+ * If the NX PE data feature is enabled in the properties table, we
+ * should take care not to create a virtual mapping that changes the
+ * relative placement of runtime services code and data regions, as
+ * they may belong to the same PE/COFF executable image in memory.
+ * The easiest way to achieve that is to simply use a 1:1 mapping.
+ */
+ prop_tbl = get_efi_config_table(EFI_PROPERTIES_TABLE_GUID);
+ flat_va_mapping = prop_tbl &&
+ (prop_tbl->memory_protection_attribute &
+ EFI_PROPERTIES_RUNTIME_MEMORY_PROTECTION_NON_EXECUTABLE_PE_DATA);
+
+ /* force efi_novamap if SetVirtualAddressMap() is unsupported */
+ efi_novamap |= !(get_supported_rt_services() &
+ EFI_RT_SUPPORTED_SET_VIRTUAL_ADDRESS_MAP);
+
+ /* hibernation expects the runtime regions to stay in the same place */
+ if (!IS_ENABLED(CONFIG_HIBERNATION) && !efi_nokaslr && !flat_va_mapping) {
+ /*
+ * Randomize the base of the UEFI runtime services region.
+ * Preserve the 2 MB alignment of the region by taking a
+ * shift of 21 bit positions into account when scaling
+ * the headroom value using a 32-bit random value.
+ */
+ static const u64 headroom = EFI_RT_VIRTUAL_LIMIT -
+ EFI_RT_VIRTUAL_BASE -
+ EFI_RT_VIRTUAL_SIZE;
+ u32 rnd;
+
+ status = efi_get_random_bytes(sizeof(rnd), (u8 *)&rnd);
+ if (status == EFI_SUCCESS) {
+ virtmap_base = EFI_RT_VIRTUAL_BASE +
+ (((headroom >> 21) * rnd) >> (32 - 21));
+ }
+ }
+
+ install_memreserve_table();
+
+ status = allocate_new_fdt_and_exit_boot(handle, &fdt_addr,
+ efi_get_max_fdt_addr(image_addr),
+ initrd_addr, initrd_size,
+ cmdline_ptr, fdt_addr, fdt_size);
+ if (status != EFI_SUCCESS)
+ goto fail_free_initrd;
+
+ if (IS_ENABLED(CONFIG_ARM))
+ efi_handle_post_ebs_state();
+
+ efi_enter_kernel(image_addr, fdt_addr, fdt_totalsize((void *)fdt_addr));
+ /* not reached */
+
+fail_free_initrd:
+ efi_err("Failed to update FDT and exit boot services\n");
+
+ efi_free(initrd_size, initrd_addr);
+ efi_free(fdt_size, fdt_addr);
+
+fail_free_image:
+ efi_free(image_size, image_addr);
+ efi_free(reserve_size, reserve_addr);
+fail_free_screeninfo:
+ free_screen_info(si);
+fail_free_cmdline:
+ efi_bs_call(free_pool, cmdline_ptr);
+fail:
+ return status;
+}
+
+/*
+ * efi_get_virtmap() - create a virtual mapping for the EFI memory map
+ *
+ * This function populates the virt_addr fields of all memory region descriptors
+ * in @memory_map whose EFI_MEMORY_RUNTIME attribute is set. Those descriptors
+ * are also copied to @runtime_map, and their total count is returned in @count.
+ */
+void efi_get_virtmap(efi_memory_desc_t *memory_map, unsigned long map_size,
+ unsigned long desc_size, efi_memory_desc_t *runtime_map,
+ int *count)
+{
+ u64 efi_virt_base = virtmap_base;
+ efi_memory_desc_t *in, *out = runtime_map;
+ int l;
+
+ for (l = 0; l < map_size; l += desc_size) {
+ u64 paddr, size;
+
+ in = (void *)memory_map + l;
+ if (!(in->attribute & EFI_MEMORY_RUNTIME))
+ continue;
+
+ paddr = in->phys_addr;
+ size = in->num_pages * EFI_PAGE_SIZE;
+
+ in->virt_addr = in->phys_addr;
+ if (efi_novamap) {
+ continue;
+ }
+
+ /*
+ * Make the mapping compatible with 64k pages: this allows
+ * a 4k page size kernel to kexec a 64k page size kernel and
+ * vice versa.
+ */
+ if (!flat_va_mapping) {
+
+ paddr = round_down(in->phys_addr, SZ_64K);
+ size += in->phys_addr - paddr;
+
+ /*
+ * Avoid wasting memory on PTEs by choosing a virtual
+ * base that is compatible with section mappings if this
+ * region has the appropriate size and physical
+ * alignment. (Sections are 2 MB on 4k granule kernels)
+ */
+ if (IS_ALIGNED(in->phys_addr, SZ_2M) && size >= SZ_2M)
+ efi_virt_base = round_up(efi_virt_base, SZ_2M);
+ else
+ efi_virt_base = round_up(efi_virt_base, SZ_64K);
+
+ in->virt_addr += efi_virt_base - paddr;
+ efi_virt_base += size;
+ }
+
+ memcpy(out, in, desc_size);
+ out = (void *)out + desc_size;
+ ++*count;
+ }
+}
diff --git a/drivers/firmware/efi/libstub/efistub.h b/drivers/firmware/efi/libstub/efistub.h
index 7f1556f..2d7abcd 100644
--- a/drivers/firmware/efi/libstub/efistub.h
+++ b/drivers/firmware/efi/libstub/efistub.h
@@ -3,8 +3,12 @@
#ifndef _DRIVERS_FIRMWARE_EFI_EFISTUB_H
#define _DRIVERS_FIRMWARE_EFI_EFISTUB_H
-/* error code which can't be mistaken for valid address */
-#define EFI_ERROR (~0UL)
+#include <linux/compiler.h>
+#include <linux/efi.h>
+#include <linux/kernel.h>
+#include <linux/kern_levels.h>
+#include <linux/types.h>
+#include <asm/efi.h>
/*
* __init annotations should not be used in the EFI stub, since the code is
@@ -25,47 +29,56 @@
#define EFI_ALLOC_ALIGN EFI_PAGE_SIZE
#endif
-extern int __pure nokaslr(void);
-extern int __pure is_quiet(void);
-extern int __pure novamap(void);
+extern bool efi_nochunk;
+extern bool efi_nokaslr;
+extern bool efi_noinitrd;
+extern int efi_loglevel;
+extern bool efi_novamap;
-#define pr_efi(sys_table, msg) do { \
- if (!is_quiet()) efi_printk(sys_table, "EFI stub: "msg); \
-} while (0)
+extern const efi_system_table_t *efi_system_table;
-#define pr_efi_err(sys_table, msg) efi_printk(sys_table, "EFI stub: ERROR: "msg)
+efi_status_t __efiapi efi_pe_entry(efi_handle_t handle,
+ efi_system_table_t *sys_table_arg);
-void efi_char16_printk(efi_system_table_t *, efi_char16_t *);
+#ifndef ARCH_HAS_EFISTUB_WRAPPERS
-unsigned long get_dram_base(efi_system_table_t *sys_table_arg);
+#define efi_is_native() (true)
+#define efi_bs_call(func, ...) efi_system_table->boottime->func(__VA_ARGS__)
+#define efi_rt_call(func, ...) efi_system_table->runtime->func(__VA_ARGS__)
+#define efi_table_attr(inst, attr) (inst->attr)
+#define efi_call_proto(inst, func, ...) inst->func(inst, ##__VA_ARGS__)
-efi_status_t allocate_new_fdt_and_exit_boot(efi_system_table_t *sys_table,
- void *handle,
- unsigned long *new_fdt_addr,
- unsigned long max_addr,
- u64 initrd_addr, u64 initrd_size,
- char *cmdline_ptr,
- unsigned long fdt_addr,
- unsigned long fdt_size);
+#endif
-void *get_fdt(efi_system_table_t *sys_table, unsigned long *fdt_size);
+#define efi_info(fmt, ...) \
+ efi_printk(KERN_INFO fmt, ##__VA_ARGS__)
+#define efi_warn(fmt, ...) \
+ efi_printk(KERN_WARNING "WARNING: " fmt, ##__VA_ARGS__)
+#define efi_err(fmt, ...) \
+ efi_printk(KERN_ERR "ERROR: " fmt, ##__VA_ARGS__)
+#define efi_debug(fmt, ...) \
+ efi_printk(KERN_DEBUG "DEBUG: " fmt, ##__VA_ARGS__)
-void efi_get_virtmap(efi_memory_desc_t *memory_map, unsigned long map_size,
- unsigned long desc_size, efi_memory_desc_t *runtime_map,
- int *count);
+#define efi_printk_once(fmt, ...) \
+({ \
+ static bool __print_once; \
+ bool __ret_print_once = !__print_once; \
+ \
+ if (!__print_once) { \
+ __print_once = true; \
+ efi_printk(fmt, ##__VA_ARGS__); \
+ } \
+ __ret_print_once; \
+})
-efi_status_t efi_get_random_bytes(efi_system_table_t *sys_table,
- unsigned long size, u8 *out);
-
-efi_status_t efi_random_alloc(efi_system_table_t *sys_table_arg,
- unsigned long size, unsigned long align,
- unsigned long *addr, unsigned long random_seed);
-
-efi_status_t check_platform_features(efi_system_table_t *sys_table_arg);
-
-efi_status_t efi_random_get_seed(efi_system_table_t *sys_table_arg);
-
-void *get_efi_config_table(efi_system_table_t *sys_table, efi_guid_t guid);
+#define efi_info_once(fmt, ...) \
+ efi_printk_once(KERN_INFO fmt, ##__VA_ARGS__)
+#define efi_warn_once(fmt, ...) \
+ efi_printk_once(KERN_WARNING "WARNING: " fmt, ##__VA_ARGS__)
+#define efi_err_once(fmt, ...) \
+ efi_printk_once(KERN_ERR "ERROR: " fmt, ##__VA_ARGS__)
+#define efi_debug_once(fmt, ...) \
+ efi_printk_once(KERN_DEBUG "DEBUG: " fmt, ##__VA_ARGS__)
/* Helper macros for the usual case of using simple C variables: */
#ifndef fdt_setprop_inplace_var
@@ -78,4 +91,761 @@
fdt_setprop((fdt), (node_offset), (name), &(var), sizeof(var))
#endif
+#define get_efi_var(name, vendor, ...) \
+ efi_rt_call(get_variable, (efi_char16_t *)(name), \
+ (efi_guid_t *)(vendor), __VA_ARGS__)
+
+#define set_efi_var(name, vendor, ...) \
+ efi_rt_call(set_variable, (efi_char16_t *)(name), \
+ (efi_guid_t *)(vendor), __VA_ARGS__)
+
+#define efi_get_handle_at(array, idx) \
+ (efi_is_native() ? (array)[idx] \
+ : (efi_handle_t)(unsigned long)((u32 *)(array))[idx])
+
+#define efi_get_handle_num(size) \
+ ((size) / (efi_is_native() ? sizeof(efi_handle_t) : sizeof(u32)))
+
+#define for_each_efi_handle(handle, array, size, i) \
+ for (i = 0; \
+ i < efi_get_handle_num(size) && \
+ ((handle = efi_get_handle_at((array), i)) || true); \
+ i++)
+
+static inline
+void efi_set_u64_split(u64 data, u32 *lo, u32 *hi)
+{
+ *lo = lower_32_bits(data);
+ *hi = upper_32_bits(data);
+}
+
+/*
+ * Allocation types for calls to boottime->allocate_pages.
+ */
+#define EFI_ALLOCATE_ANY_PAGES 0
+#define EFI_ALLOCATE_MAX_ADDRESS 1
+#define EFI_ALLOCATE_ADDRESS 2
+#define EFI_MAX_ALLOCATE_TYPE 3
+
+/*
+ * The type of search to perform when calling boottime->locate_handle
+ */
+#define EFI_LOCATE_ALL_HANDLES 0
+#define EFI_LOCATE_BY_REGISTER_NOTIFY 1
+#define EFI_LOCATE_BY_PROTOCOL 2
+
+/*
+ * boottime->stall takes the time period in microseconds
+ */
+#define EFI_USEC_PER_SEC 1000000
+
+/*
+ * boottime->set_timer takes the time in 100ns units
+ */
+#define EFI_100NSEC_PER_USEC ((u64)10)
+
+/*
+ * An efi_boot_memmap is used by efi_get_memory_map() to return the
+ * EFI memory map in a dynamically allocated buffer.
+ *
+ * The buffer allocated for the EFI memory map includes extra room for
+ * a minimum of EFI_MMAP_NR_SLACK_SLOTS additional EFI memory descriptors.
+ * This facilitates the reuse of the EFI memory map buffer when a second
+ * call to ExitBootServices() is needed because of intervening changes to
+ * the EFI memory map. Other related structures, e.g. x86 e820ext, need
+ * to factor in this headroom requirement as well.
+ */
+#define EFI_MMAP_NR_SLACK_SLOTS 8
+
+struct efi_boot_memmap {
+ efi_memory_desc_t **map;
+ unsigned long *map_size;
+ unsigned long *desc_size;
+ u32 *desc_ver;
+ unsigned long *key_ptr;
+ unsigned long *buff_size;
+};
+
+typedef struct efi_generic_dev_path efi_device_path_protocol_t;
+
+typedef void *efi_event_t;
+/* Note that notifications won't work in mixed mode */
+typedef void (__efiapi *efi_event_notify_t)(efi_event_t, void *);
+
+#define EFI_EVT_TIMER 0x80000000U
+#define EFI_EVT_RUNTIME 0x40000000U
+#define EFI_EVT_NOTIFY_WAIT 0x00000100U
+#define EFI_EVT_NOTIFY_SIGNAL 0x00000200U
+
+/**
+ * efi_set_event_at() - add event to events array
+ *
+ * @events: array of UEFI events
+ * @ids: index where to put the event in the array
+ * @event: event to add to the aray
+ *
+ * boottime->wait_for_event() takes an array of events as input.
+ * Provide a helper to set it up correctly for mixed mode.
+ */
+static inline
+void efi_set_event_at(efi_event_t *events, size_t idx, efi_event_t event)
+{
+ if (efi_is_native())
+ events[idx] = event;
+ else
+ ((u32 *)events)[idx] = (u32)(unsigned long)event;
+}
+
+#define EFI_TPL_APPLICATION 4
+#define EFI_TPL_CALLBACK 8
+#define EFI_TPL_NOTIFY 16
+#define EFI_TPL_HIGH_LEVEL 31
+
+typedef enum {
+ EfiTimerCancel,
+ EfiTimerPeriodic,
+ EfiTimerRelative
+} EFI_TIMER_DELAY;
+
+/*
+ * EFI Boot Services table
+ */
+union efi_boot_services {
+ struct {
+ efi_table_hdr_t hdr;
+ void *raise_tpl;
+ void *restore_tpl;
+ efi_status_t (__efiapi *allocate_pages)(int, int, unsigned long,
+ efi_physical_addr_t *);
+ efi_status_t (__efiapi *free_pages)(efi_physical_addr_t,
+ unsigned long);
+ efi_status_t (__efiapi *get_memory_map)(unsigned long *, void *,
+ unsigned long *,
+ unsigned long *, u32 *);
+ efi_status_t (__efiapi *allocate_pool)(int, unsigned long,
+ void **);
+ efi_status_t (__efiapi *free_pool)(void *);
+ efi_status_t (__efiapi *create_event)(u32, unsigned long,
+ efi_event_notify_t, void *,
+ efi_event_t *);
+ efi_status_t (__efiapi *set_timer)(efi_event_t,
+ EFI_TIMER_DELAY, u64);
+ efi_status_t (__efiapi *wait_for_event)(unsigned long,
+ efi_event_t *,
+ unsigned long *);
+ void *signal_event;
+ efi_status_t (__efiapi *close_event)(efi_event_t);
+ void *check_event;
+ void *install_protocol_interface;
+ void *reinstall_protocol_interface;
+ void *uninstall_protocol_interface;
+ efi_status_t (__efiapi *handle_protocol)(efi_handle_t,
+ efi_guid_t *, void **);
+ void *__reserved;
+ void *register_protocol_notify;
+ efi_status_t (__efiapi *locate_handle)(int, efi_guid_t *,
+ void *, unsigned long *,
+ efi_handle_t *);
+ efi_status_t (__efiapi *locate_device_path)(efi_guid_t *,
+ efi_device_path_protocol_t **,
+ efi_handle_t *);
+ efi_status_t (__efiapi *install_configuration_table)(efi_guid_t *,
+ void *);
+ void *load_image;
+ void *start_image;
+ efi_status_t __noreturn (__efiapi *exit)(efi_handle_t,
+ efi_status_t,
+ unsigned long,
+ efi_char16_t *);
+ void *unload_image;
+ efi_status_t (__efiapi *exit_boot_services)(efi_handle_t,
+ unsigned long);
+ void *get_next_monotonic_count;
+ efi_status_t (__efiapi *stall)(unsigned long);
+ void *set_watchdog_timer;
+ void *connect_controller;
+ efi_status_t (__efiapi *disconnect_controller)(efi_handle_t,
+ efi_handle_t,
+ efi_handle_t);
+ void *open_protocol;
+ void *close_protocol;
+ void *open_protocol_information;
+ void *protocols_per_handle;
+ void *locate_handle_buffer;
+ efi_status_t (__efiapi *locate_protocol)(efi_guid_t *, void *,
+ void **);
+ void *install_multiple_protocol_interfaces;
+ void *uninstall_multiple_protocol_interfaces;
+ void *calculate_crc32;
+ void *copy_mem;
+ void *set_mem;
+ void *create_event_ex;
+ };
+ struct {
+ efi_table_hdr_t hdr;
+ u32 raise_tpl;
+ u32 restore_tpl;
+ u32 allocate_pages;
+ u32 free_pages;
+ u32 get_memory_map;
+ u32 allocate_pool;
+ u32 free_pool;
+ u32 create_event;
+ u32 set_timer;
+ u32 wait_for_event;
+ u32 signal_event;
+ u32 close_event;
+ u32 check_event;
+ u32 install_protocol_interface;
+ u32 reinstall_protocol_interface;
+ u32 uninstall_protocol_interface;
+ u32 handle_protocol;
+ u32 __reserved;
+ u32 register_protocol_notify;
+ u32 locate_handle;
+ u32 locate_device_path;
+ u32 install_configuration_table;
+ u32 load_image;
+ u32 start_image;
+ u32 exit;
+ u32 unload_image;
+ u32 exit_boot_services;
+ u32 get_next_monotonic_count;
+ u32 stall;
+ u32 set_watchdog_timer;
+ u32 connect_controller;
+ u32 disconnect_controller;
+ u32 open_protocol;
+ u32 close_protocol;
+ u32 open_protocol_information;
+ u32 protocols_per_handle;
+ u32 locate_handle_buffer;
+ u32 locate_protocol;
+ u32 install_multiple_protocol_interfaces;
+ u32 uninstall_multiple_protocol_interfaces;
+ u32 calculate_crc32;
+ u32 copy_mem;
+ u32 set_mem;
+ u32 create_event_ex;
+ } mixed_mode;
+};
+
+typedef union efi_uga_draw_protocol efi_uga_draw_protocol_t;
+
+union efi_uga_draw_protocol {
+ struct {
+ efi_status_t (__efiapi *get_mode)(efi_uga_draw_protocol_t *,
+ u32*, u32*, u32*, u32*);
+ void *set_mode;
+ void *blt;
+ };
+ struct {
+ u32 get_mode;
+ u32 set_mode;
+ u32 blt;
+ } mixed_mode;
+};
+
+typedef struct {
+ u16 scan_code;
+ efi_char16_t unicode_char;
+} efi_input_key_t;
+
+union efi_simple_text_input_protocol {
+ struct {
+ void *reset;
+ efi_status_t (__efiapi *read_keystroke)(efi_simple_text_input_protocol_t *,
+ efi_input_key_t *);
+ efi_event_t wait_for_key;
+ };
+ struct {
+ u32 reset;
+ u32 read_keystroke;
+ u32 wait_for_key;
+ } mixed_mode;
+};
+
+efi_status_t efi_wait_for_key(unsigned long usec, efi_input_key_t *key);
+
+union efi_simple_text_output_protocol {
+ struct {
+ void *reset;
+ efi_status_t (__efiapi *output_string)(efi_simple_text_output_protocol_t *,
+ efi_char16_t *);
+ void *test_string;
+ };
+ struct {
+ u32 reset;
+ u32 output_string;
+ u32 test_string;
+ } mixed_mode;
+};
+
+#define PIXEL_RGB_RESERVED_8BIT_PER_COLOR 0
+#define PIXEL_BGR_RESERVED_8BIT_PER_COLOR 1
+#define PIXEL_BIT_MASK 2
+#define PIXEL_BLT_ONLY 3
+#define PIXEL_FORMAT_MAX 4
+
+typedef struct {
+ u32 red_mask;
+ u32 green_mask;
+ u32 blue_mask;
+ u32 reserved_mask;
+} efi_pixel_bitmask_t;
+
+typedef struct {
+ u32 version;
+ u32 horizontal_resolution;
+ u32 vertical_resolution;
+ int pixel_format;
+ efi_pixel_bitmask_t pixel_information;
+ u32 pixels_per_scan_line;
+} efi_graphics_output_mode_info_t;
+
+typedef union efi_graphics_output_protocol_mode efi_graphics_output_protocol_mode_t;
+
+union efi_graphics_output_protocol_mode {
+ struct {
+ u32 max_mode;
+ u32 mode;
+ efi_graphics_output_mode_info_t *info;
+ unsigned long size_of_info;
+ efi_physical_addr_t frame_buffer_base;
+ unsigned long frame_buffer_size;
+ };
+ struct {
+ u32 max_mode;
+ u32 mode;
+ u32 info;
+ u32 size_of_info;
+ u64 frame_buffer_base;
+ u32 frame_buffer_size;
+ } mixed_mode;
+};
+
+typedef union efi_graphics_output_protocol efi_graphics_output_protocol_t;
+
+union efi_graphics_output_protocol {
+ struct {
+ efi_status_t (__efiapi *query_mode)(efi_graphics_output_protocol_t *,
+ u32, unsigned long *,
+ efi_graphics_output_mode_info_t **);
+ efi_status_t (__efiapi *set_mode) (efi_graphics_output_protocol_t *, u32);
+ void *blt;
+ efi_graphics_output_protocol_mode_t *mode;
+ };
+ struct {
+ u32 query_mode;
+ u32 set_mode;
+ u32 blt;
+ u32 mode;
+ } mixed_mode;
+};
+
+typedef union {
+ struct {
+ u32 revision;
+ efi_handle_t parent_handle;
+ efi_system_table_t *system_table;
+ efi_handle_t device_handle;
+ void *file_path;
+ void *reserved;
+ u32 load_options_size;
+ void *load_options;
+ void *image_base;
+ __aligned_u64 image_size;
+ unsigned int image_code_type;
+ unsigned int image_data_type;
+ efi_status_t (__efiapi *unload)(efi_handle_t image_handle);
+ };
+ struct {
+ u32 revision;
+ u32 parent_handle;
+ u32 system_table;
+ u32 device_handle;
+ u32 file_path;
+ u32 reserved;
+ u32 load_options_size;
+ u32 load_options;
+ u32 image_base;
+ __aligned_u64 image_size;
+ u32 image_code_type;
+ u32 image_data_type;
+ u32 unload;
+ } mixed_mode;
+} efi_loaded_image_t;
+
+typedef struct {
+ u64 size;
+ u64 file_size;
+ u64 phys_size;
+ efi_time_t create_time;
+ efi_time_t last_access_time;
+ efi_time_t modification_time;
+ __aligned_u64 attribute;
+ efi_char16_t filename[];
+} efi_file_info_t;
+
+typedef struct efi_file_protocol efi_file_protocol_t;
+
+struct efi_file_protocol {
+ u64 revision;
+ efi_status_t (__efiapi *open) (efi_file_protocol_t *,
+ efi_file_protocol_t **,
+ efi_char16_t *, u64, u64);
+ efi_status_t (__efiapi *close) (efi_file_protocol_t *);
+ efi_status_t (__efiapi *delete) (efi_file_protocol_t *);
+ efi_status_t (__efiapi *read) (efi_file_protocol_t *,
+ unsigned long *, void *);
+ efi_status_t (__efiapi *write) (efi_file_protocol_t *,
+ unsigned long, void *);
+ efi_status_t (__efiapi *get_position)(efi_file_protocol_t *, u64 *);
+ efi_status_t (__efiapi *set_position)(efi_file_protocol_t *, u64);
+ efi_status_t (__efiapi *get_info) (efi_file_protocol_t *,
+ efi_guid_t *, unsigned long *,
+ void *);
+ efi_status_t (__efiapi *set_info) (efi_file_protocol_t *,
+ efi_guid_t *, unsigned long,
+ void *);
+ efi_status_t (__efiapi *flush) (efi_file_protocol_t *);
+};
+
+typedef struct efi_simple_file_system_protocol efi_simple_file_system_protocol_t;
+
+struct efi_simple_file_system_protocol {
+ u64 revision;
+ int (__efiapi *open_volume)(efi_simple_file_system_protocol_t *,
+ efi_file_protocol_t **);
+};
+
+#define EFI_FILE_MODE_READ 0x0000000000000001
+#define EFI_FILE_MODE_WRITE 0x0000000000000002
+#define EFI_FILE_MODE_CREATE 0x8000000000000000
+
+typedef enum {
+ EfiPciIoWidthUint8,
+ EfiPciIoWidthUint16,
+ EfiPciIoWidthUint32,
+ EfiPciIoWidthUint64,
+ EfiPciIoWidthFifoUint8,
+ EfiPciIoWidthFifoUint16,
+ EfiPciIoWidthFifoUint32,
+ EfiPciIoWidthFifoUint64,
+ EfiPciIoWidthFillUint8,
+ EfiPciIoWidthFillUint16,
+ EfiPciIoWidthFillUint32,
+ EfiPciIoWidthFillUint64,
+ EfiPciIoWidthMaximum
+} EFI_PCI_IO_PROTOCOL_WIDTH;
+
+typedef enum {
+ EfiPciIoAttributeOperationGet,
+ EfiPciIoAttributeOperationSet,
+ EfiPciIoAttributeOperationEnable,
+ EfiPciIoAttributeOperationDisable,
+ EfiPciIoAttributeOperationSupported,
+ EfiPciIoAttributeOperationMaximum
+} EFI_PCI_IO_PROTOCOL_ATTRIBUTE_OPERATION;
+
+typedef struct {
+ u32 read;
+ u32 write;
+} efi_pci_io_protocol_access_32_t;
+
+typedef union efi_pci_io_protocol efi_pci_io_protocol_t;
+
+typedef
+efi_status_t (__efiapi *efi_pci_io_protocol_cfg_t)(efi_pci_io_protocol_t *,
+ EFI_PCI_IO_PROTOCOL_WIDTH,
+ u32 offset,
+ unsigned long count,
+ void *buffer);
+
+typedef struct {
+ void *read;
+ void *write;
+} efi_pci_io_protocol_access_t;
+
+typedef struct {
+ efi_pci_io_protocol_cfg_t read;
+ efi_pci_io_protocol_cfg_t write;
+} efi_pci_io_protocol_config_access_t;
+
+union efi_pci_io_protocol {
+ struct {
+ void *poll_mem;
+ void *poll_io;
+ efi_pci_io_protocol_access_t mem;
+ efi_pci_io_protocol_access_t io;
+ efi_pci_io_protocol_config_access_t pci;
+ void *copy_mem;
+ void *map;
+ void *unmap;
+ void *allocate_buffer;
+ void *free_buffer;
+ void *flush;
+ efi_status_t (__efiapi *get_location)(efi_pci_io_protocol_t *,
+ unsigned long *segment_nr,
+ unsigned long *bus_nr,
+ unsigned long *device_nr,
+ unsigned long *func_nr);
+ void *attributes;
+ void *get_bar_attributes;
+ void *set_bar_attributes;
+ uint64_t romsize;
+ void *romimage;
+ };
+ struct {
+ u32 poll_mem;
+ u32 poll_io;
+ efi_pci_io_protocol_access_32_t mem;
+ efi_pci_io_protocol_access_32_t io;
+ efi_pci_io_protocol_access_32_t pci;
+ u32 copy_mem;
+ u32 map;
+ u32 unmap;
+ u32 allocate_buffer;
+ u32 free_buffer;
+ u32 flush;
+ u32 get_location;
+ u32 attributes;
+ u32 get_bar_attributes;
+ u32 set_bar_attributes;
+ u64 romsize;
+ u32 romimage;
+ } mixed_mode;
+};
+
+#define EFI_PCI_IO_ATTRIBUTE_ISA_MOTHERBOARD_IO 0x0001
+#define EFI_PCI_IO_ATTRIBUTE_ISA_IO 0x0002
+#define EFI_PCI_IO_ATTRIBUTE_VGA_PALETTE_IO 0x0004
+#define EFI_PCI_IO_ATTRIBUTE_VGA_MEMORY 0x0008
+#define EFI_PCI_IO_ATTRIBUTE_VGA_IO 0x0010
+#define EFI_PCI_IO_ATTRIBUTE_IDE_PRIMARY_IO 0x0020
+#define EFI_PCI_IO_ATTRIBUTE_IDE_SECONDARY_IO 0x0040
+#define EFI_PCI_IO_ATTRIBUTE_MEMORY_WRITE_COMBINE 0x0080
+#define EFI_PCI_IO_ATTRIBUTE_IO 0x0100
+#define EFI_PCI_IO_ATTRIBUTE_MEMORY 0x0200
+#define EFI_PCI_IO_ATTRIBUTE_BUS_MASTER 0x0400
+#define EFI_PCI_IO_ATTRIBUTE_MEMORY_CACHED 0x0800
+#define EFI_PCI_IO_ATTRIBUTE_MEMORY_DISABLE 0x1000
+#define EFI_PCI_IO_ATTRIBUTE_EMBEDDED_DEVICE 0x2000
+#define EFI_PCI_IO_ATTRIBUTE_EMBEDDED_ROM 0x4000
+#define EFI_PCI_IO_ATTRIBUTE_DUAL_ADDRESS_CYCLE 0x8000
+#define EFI_PCI_IO_ATTRIBUTE_ISA_IO_16 0x10000
+#define EFI_PCI_IO_ATTRIBUTE_VGA_PALETTE_IO_16 0x20000
+#define EFI_PCI_IO_ATTRIBUTE_VGA_IO_16 0x40000
+
+struct efi_dev_path;
+
+typedef union apple_properties_protocol apple_properties_protocol_t;
+
+union apple_properties_protocol {
+ struct {
+ unsigned long version;
+ efi_status_t (__efiapi *get)(apple_properties_protocol_t *,
+ struct efi_dev_path *,
+ efi_char16_t *, void *, u32 *);
+ efi_status_t (__efiapi *set)(apple_properties_protocol_t *,
+ struct efi_dev_path *,
+ efi_char16_t *, void *, u32);
+ efi_status_t (__efiapi *del)(apple_properties_protocol_t *,
+ struct efi_dev_path *,
+ efi_char16_t *);
+ efi_status_t (__efiapi *get_all)(apple_properties_protocol_t *,
+ void *buffer, u32 *);
+ };
+ struct {
+ u32 version;
+ u32 get;
+ u32 set;
+ u32 del;
+ u32 get_all;
+ } mixed_mode;
+};
+
+typedef u32 efi_tcg2_event_log_format;
+
+typedef union efi_tcg2_protocol efi_tcg2_protocol_t;
+
+union efi_tcg2_protocol {
+ struct {
+ void *get_capability;
+ efi_status_t (__efiapi *get_event_log)(efi_handle_t,
+ efi_tcg2_event_log_format,
+ efi_physical_addr_t *,
+ efi_physical_addr_t *,
+ efi_bool_t *);
+ void *hash_log_extend_event;
+ void *submit_command;
+ void *get_active_pcr_banks;
+ void *set_active_pcr_banks;
+ void *get_result_of_set_active_pcr_banks;
+ };
+ struct {
+ u32 get_capability;
+ u32 get_event_log;
+ u32 hash_log_extend_event;
+ u32 submit_command;
+ u32 get_active_pcr_banks;
+ u32 set_active_pcr_banks;
+ u32 get_result_of_set_active_pcr_banks;
+ } mixed_mode;
+};
+
+typedef union efi_load_file_protocol efi_load_file_protocol_t;
+typedef union efi_load_file_protocol efi_load_file2_protocol_t;
+
+union efi_load_file_protocol {
+ struct {
+ efi_status_t (__efiapi *load_file)(efi_load_file_protocol_t *,
+ efi_device_path_protocol_t *,
+ bool, unsigned long *, void *);
+ };
+ struct {
+ u32 load_file;
+ } mixed_mode;
+};
+
+typedef struct {
+ u32 attributes;
+ u16 file_path_list_length;
+ u8 variable_data[];
+ // efi_char16_t description[];
+ // efi_device_path_protocol_t file_path_list[];
+ // u8 optional_data[];
+} __packed efi_load_option_t;
+
+#define EFI_LOAD_OPTION_ACTIVE 0x0001U
+#define EFI_LOAD_OPTION_FORCE_RECONNECT 0x0002U
+#define EFI_LOAD_OPTION_HIDDEN 0x0008U
+#define EFI_LOAD_OPTION_CATEGORY 0x1f00U
+#define EFI_LOAD_OPTION_CATEGORY_BOOT 0x0000U
+#define EFI_LOAD_OPTION_CATEGORY_APP 0x0100U
+
+#define EFI_LOAD_OPTION_BOOT_MASK \
+ (EFI_LOAD_OPTION_ACTIVE|EFI_LOAD_OPTION_HIDDEN|EFI_LOAD_OPTION_CATEGORY)
+#define EFI_LOAD_OPTION_MASK (EFI_LOAD_OPTION_FORCE_RECONNECT|EFI_LOAD_OPTION_BOOT_MASK)
+
+typedef struct {
+ u32 attributes;
+ u16 file_path_list_length;
+ const efi_char16_t *description;
+ const efi_device_path_protocol_t *file_path_list;
+ size_t optional_data_size;
+ const void *optional_data;
+} efi_load_option_unpacked_t;
+
+void efi_pci_disable_bridge_busmaster(void);
+
+typedef efi_status_t (*efi_exit_boot_map_processing)(
+ struct efi_boot_memmap *map,
+ void *priv);
+
+efi_status_t efi_exit_boot_services(void *handle,
+ struct efi_boot_memmap *map,
+ void *priv,
+ efi_exit_boot_map_processing priv_func);
+
+efi_status_t allocate_new_fdt_and_exit_boot(void *handle,
+ unsigned long *new_fdt_addr,
+ unsigned long max_addr,
+ u64 initrd_addr, u64 initrd_size,
+ char *cmdline_ptr,
+ unsigned long fdt_addr,
+ unsigned long fdt_size);
+
+void *get_fdt(unsigned long *fdt_size);
+
+void efi_get_virtmap(efi_memory_desc_t *memory_map, unsigned long map_size,
+ unsigned long desc_size, efi_memory_desc_t *runtime_map,
+ int *count);
+
+efi_status_t efi_get_random_bytes(unsigned long size, u8 *out);
+
+efi_status_t efi_random_alloc(unsigned long size, unsigned long align,
+ unsigned long *addr, unsigned long random_seed);
+
+efi_status_t check_platform_features(void);
+
+void *get_efi_config_table(efi_guid_t guid);
+
+/* NOTE: These functions do not print a trailing newline after the string */
+void efi_char16_puts(efi_char16_t *);
+void efi_puts(const char *str);
+
+__printf(1, 2) int efi_printk(char const *fmt, ...);
+
+void efi_free(unsigned long size, unsigned long addr);
+
+void efi_apply_loadoptions_quirk(const void **load_options, int *load_options_size);
+
+char *efi_convert_cmdline(efi_loaded_image_t *image, int *cmd_line_len);
+
+efi_status_t efi_get_memory_map(struct efi_boot_memmap *map);
+
+efi_status_t efi_allocate_pages(unsigned long size, unsigned long *addr,
+ unsigned long max);
+
+efi_status_t efi_allocate_pages_aligned(unsigned long size, unsigned long *addr,
+ unsigned long max, unsigned long align);
+
+efi_status_t efi_low_alloc_above(unsigned long size, unsigned long align,
+ unsigned long *addr, unsigned long min);
+
+efi_status_t efi_relocate_kernel(unsigned long *image_addr,
+ unsigned long image_size,
+ unsigned long alloc_size,
+ unsigned long preferred_addr,
+ unsigned long alignment,
+ unsigned long min_addr);
+
+efi_status_t efi_parse_options(char const *cmdline);
+
+void efi_parse_option_graphics(char *option);
+
+efi_status_t efi_setup_gop(struct screen_info *si, efi_guid_t *proto,
+ unsigned long size);
+
+efi_status_t handle_cmdline_files(efi_loaded_image_t *image,
+ const efi_char16_t *optstr,
+ int optstr_size,
+ unsigned long soft_limit,
+ unsigned long hard_limit,
+ unsigned long *load_addr,
+ unsigned long *load_size);
+
+
+static inline efi_status_t efi_load_dtb(efi_loaded_image_t *image,
+ unsigned long *load_addr,
+ unsigned long *load_size)
+{
+ return handle_cmdline_files(image, L"dtb=", sizeof(L"dtb=") - 2,
+ ULONG_MAX, ULONG_MAX, load_addr, load_size);
+}
+
+efi_status_t efi_load_initrd(efi_loaded_image_t *image,
+ unsigned long *load_addr,
+ unsigned long *load_size,
+ unsigned long soft_limit,
+ unsigned long hard_limit);
+/*
+ * This function handles the architcture specific differences between arm and
+ * arm64 regarding where the kernel image must be loaded and any memory that
+ * must be reserved. On failure it is required to free all
+ * all allocations it has made.
+ */
+efi_status_t handle_kernel_image(unsigned long *image_addr,
+ unsigned long *image_size,
+ unsigned long *reserve_addr,
+ unsigned long *reserve_size,
+ efi_loaded_image_t *image);
+
+asmlinkage void __noreturn efi_enter_kernel(unsigned long entrypoint,
+ unsigned long fdt_addr,
+ unsigned long fdt_size);
+
+void efi_handle_post_ebs_state(void);
+
#endif
diff --git a/drivers/firmware/efi/libstub/fdt.c b/drivers/firmware/efi/libstub/fdt.c
index 0bf0190..368cd60 100644
--- a/drivers/firmware/efi/libstub/fdt.c
+++ b/drivers/firmware/efi/libstub/fdt.c
@@ -16,7 +16,7 @@
#define EFI_DT_ADDR_CELLS_DEFAULT 2
#define EFI_DT_SIZE_CELLS_DEFAULT 2
-static void fdt_update_cell_size(efi_system_table_t *sys_table, void *fdt)
+static void fdt_update_cell_size(void *fdt)
{
int offset;
@@ -27,8 +27,7 @@
fdt_setprop_u32(fdt, offset, "#size-cells", EFI_DT_SIZE_CELLS_DEFAULT);
}
-static efi_status_t update_fdt(efi_system_table_t *sys_table, void *orig_fdt,
- unsigned long orig_fdt_size,
+static efi_status_t update_fdt(void *orig_fdt, unsigned long orig_fdt_size,
void *fdt, int new_fdt_size, char *cmdline_ptr,
u64 initrd_addr, u64 initrd_size)
{
@@ -40,7 +39,7 @@
/* Do some checks on provided FDT, if it exists: */
if (orig_fdt) {
if (fdt_check_header(orig_fdt)) {
- pr_efi_err(sys_table, "Device Tree header not valid!\n");
+ efi_err("Device Tree header not valid!\n");
return EFI_LOAD_ERROR;
}
/*
@@ -48,7 +47,7 @@
* configuration table:
*/
if (orig_fdt_size && fdt_totalsize(orig_fdt) > orig_fdt_size) {
- pr_efi_err(sys_table, "Truncated device tree! foo!\n");
+ efi_err("Truncated device tree! foo!\n");
return EFI_LOAD_ERROR;
}
}
@@ -62,7 +61,7 @@
* Any failure from the following function is
* non-critical:
*/
- fdt_update_cell_size(sys_table, fdt);
+ fdt_update_cell_size(fdt);
}
}
@@ -111,7 +110,7 @@
/* Add FDT entries for EFI runtime services in chosen node. */
node = fdt_subnode_offset(fdt, 0, "chosen");
- fdt_val64 = cpu_to_fdt64((u64)(unsigned long)sys_table);
+ fdt_val64 = cpu_to_fdt64((u64)(unsigned long)efi_system_table);
status = fdt_setprop_var(fdt, node, "linux,uefi-system-table", fdt_val64);
if (status)
@@ -137,17 +136,15 @@
if (status)
goto fdt_set_fail;
- if (IS_ENABLED(CONFIG_RANDOMIZE_BASE)) {
+ if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && !efi_nokaslr) {
efi_status_t efi_status;
- efi_status = efi_get_random_bytes(sys_table, sizeof(fdt_val64),
+ efi_status = efi_get_random_bytes(sizeof(fdt_val64),
(u8 *)&fdt_val64);
if (efi_status == EFI_SUCCESS) {
status = fdt_setprop_var(fdt, node, "kaslr-seed", fdt_val64);
if (status)
goto fdt_set_fail;
- } else if (efi_status != EFI_NOT_FOUND) {
- return efi_status;
}
}
@@ -200,18 +197,13 @@
return EFI_SUCCESS;
}
-#ifndef EFI_FDT_ALIGN
-# define EFI_FDT_ALIGN EFI_PAGE_SIZE
-#endif
-
struct exit_boot_struct {
efi_memory_desc_t *runtime_map;
int *runtime_entry_count;
void *new_fdt_addr;
};
-static efi_status_t exit_boot_func(efi_system_table_t *sys_table_arg,
- struct efi_boot_memmap *map,
+static efi_status_t exit_boot_func(struct efi_boot_memmap *map,
void *priv)
{
struct exit_boot_struct *p = priv;
@@ -244,8 +236,7 @@
* with the final memory map in it.
*/
-efi_status_t allocate_new_fdt_and_exit_boot(efi_system_table_t *sys_table,
- void *handle,
+efi_status_t allocate_new_fdt_and_exit_boot(void *handle,
unsigned long *new_fdt_addr,
unsigned long max_addr,
u64 initrd_addr, u64 initrd_size,
@@ -275,19 +266,18 @@
* subsequent allocations adding entries, since they could not affect
* the number of EFI_MEMORY_RUNTIME regions.
*/
- status = efi_get_memory_map(sys_table, &map);
+ status = efi_get_memory_map(&map);
if (status != EFI_SUCCESS) {
- pr_efi_err(sys_table, "Unable to retrieve UEFI memory map.\n");
+ efi_err("Unable to retrieve UEFI memory map.\n");
return status;
}
- pr_efi(sys_table, "Exiting boot services and installing virtual address map...\n");
+ efi_info("Exiting boot services and installing virtual address map...\n");
map.map = &memory_map;
- status = efi_high_alloc(sys_table, MAX_FDT_SIZE, EFI_FDT_ALIGN,
- new_fdt_addr, max_addr);
+ status = efi_allocate_pages(MAX_FDT_SIZE, new_fdt_addr, max_addr);
if (status != EFI_SUCCESS) {
- pr_efi_err(sys_table, "Unable to allocate memory for new device tree.\n");
+ efi_err("Unable to allocate memory for new device tree.\n");
goto fail;
}
@@ -295,16 +285,16 @@
* Now that we have done our final memory allocation (and free)
* we can get the memory map key needed for exit_boot_services().
*/
- status = efi_get_memory_map(sys_table, &map);
+ status = efi_get_memory_map(&map);
if (status != EFI_SUCCESS)
goto fail_free_new_fdt;
- status = update_fdt(sys_table, (void *)fdt_addr, fdt_size,
+ status = update_fdt((void *)fdt_addr, fdt_size,
(void *)*new_fdt_addr, MAX_FDT_SIZE, cmdline_ptr,
initrd_addr, initrd_size);
if (status != EFI_SUCCESS) {
- pr_efi_err(sys_table, "Unable to construct new device tree.\n");
+ efi_err("Unable to construct new device tree.\n");
goto fail_free_new_fdt;
}
@@ -313,16 +303,16 @@
priv.runtime_entry_count = &runtime_entry_count;
priv.new_fdt_addr = (void *)*new_fdt_addr;
- status = efi_exit_boot_services(sys_table, handle, &map, &priv, exit_boot_func);
+ status = efi_exit_boot_services(handle, &map, &priv, exit_boot_func);
if (status == EFI_SUCCESS) {
efi_set_virtual_address_map_t *svam;
- if (novamap())
+ if (efi_novamap)
return EFI_SUCCESS;
/* Install the new virtual address map */
- svam = sys_table->runtime->set_virtual_address_map;
+ svam = efi_system_table->runtime->set_virtual_address_map;
status = svam(runtime_entry_count * desc_size, desc_size,
desc_ver, runtime_map);
@@ -350,28 +340,28 @@
return EFI_SUCCESS;
}
- pr_efi_err(sys_table, "Exit boot services failed.\n");
+ efi_err("Exit boot services failed.\n");
fail_free_new_fdt:
- efi_free(sys_table, MAX_FDT_SIZE, *new_fdt_addr);
+ efi_free(MAX_FDT_SIZE, *new_fdt_addr);
fail:
- sys_table->boottime->free_pool(runtime_map);
+ efi_system_table->boottime->free_pool(runtime_map);
return EFI_LOAD_ERROR;
}
-void *get_fdt(efi_system_table_t *sys_table, unsigned long *fdt_size)
+void *get_fdt(unsigned long *fdt_size)
{
void *fdt;
- fdt = get_efi_config_table(sys_table, DEVICE_TREE_GUID);
+ fdt = get_efi_config_table(DEVICE_TREE_GUID);
if (!fdt)
return NULL;
if (fdt_check_header(fdt) != 0) {
- pr_efi_err(sys_table, "Invalid header detected on UEFI supplied FDT, ignoring ...\n");
+ efi_err("Invalid header detected on UEFI supplied FDT, ignoring ...\n");
return NULL;
}
*fdt_size = fdt_totalsize(fdt);
diff --git a/drivers/firmware/efi/libstub/file.c b/drivers/firmware/efi/libstub/file.c
new file mode 100644
index 0000000..dd95f33
--- /dev/null
+++ b/drivers/firmware/efi/libstub/file.c
@@ -0,0 +1,250 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Helper functions used by the EFI stub on multiple
+ * architectures. This should be #included by the EFI stub
+ * implementation files.
+ *
+ * Copyright 2011 Intel Corporation; author Matt Fleming
+ */
+
+#include <linux/efi.h>
+#include <asm/efi.h>
+
+#include "efistub.h"
+
+#define MAX_FILENAME_SIZE 256
+
+/*
+ * Some firmware implementations have problems reading files in one go.
+ * A read chunk size of 1MB seems to work for most platforms.
+ *
+ * Unfortunately, reading files in chunks triggers *other* bugs on some
+ * platforms, so we provide a way to disable this workaround, which can
+ * be done by passing "efi=nochunk" on the EFI boot stub command line.
+ *
+ * If you experience issues with initrd images being corrupt it's worth
+ * trying efi=nochunk, but chunking is enabled by default on x86 because
+ * there are far more machines that require the workaround than those that
+ * break with it enabled.
+ */
+#define EFI_READ_CHUNK_SIZE SZ_1M
+
+struct finfo {
+ efi_file_info_t info;
+ efi_char16_t filename[MAX_FILENAME_SIZE];
+};
+
+static efi_status_t efi_open_file(efi_file_protocol_t *volume,
+ struct finfo *fi,
+ efi_file_protocol_t **handle,
+ unsigned long *file_size)
+{
+ efi_guid_t info_guid = EFI_FILE_INFO_ID;
+ efi_file_protocol_t *fh;
+ unsigned long info_sz;
+ efi_status_t status;
+
+ status = volume->open(volume, &fh, fi->filename, EFI_FILE_MODE_READ, 0);
+ if (status != EFI_SUCCESS) {
+ efi_err("Failed to open file: %ls\n", fi->filename);
+ return status;
+ }
+
+ info_sz = sizeof(struct finfo);
+ status = fh->get_info(fh, &info_guid, &info_sz, fi);
+ if (status != EFI_SUCCESS) {
+ efi_err("Failed to get file info\n");
+ fh->close(fh);
+ return status;
+ }
+
+ *handle = fh;
+ *file_size = fi->info.file_size;
+ return EFI_SUCCESS;
+}
+
+static efi_status_t efi_open_volume(efi_loaded_image_t *image,
+ efi_file_protocol_t **fh)
+{
+ efi_guid_t fs_proto = EFI_FILE_SYSTEM_GUID;
+ efi_simple_file_system_protocol_t *io;
+ efi_status_t status;
+
+ status = efi_bs_call(handle_protocol, image->device_handle, &fs_proto,
+ (void **)&io);
+ if (status != EFI_SUCCESS) {
+ efi_err("Failed to handle fs_proto\n");
+ return status;
+ }
+
+ status = io->open_volume(io, fh);
+ if (status != EFI_SUCCESS)
+ efi_err("Failed to open volume\n");
+
+ return status;
+}
+
+static int find_file_option(const efi_char16_t *cmdline, int cmdline_len,
+ const efi_char16_t *prefix, int prefix_size,
+ efi_char16_t *result, int result_len)
+{
+ int prefix_len = prefix_size / 2;
+ bool found = false;
+ int i;
+
+ for (i = prefix_len; i < cmdline_len; i++) {
+ if (!memcmp(&cmdline[i - prefix_len], prefix, prefix_size)) {
+ found = true;
+ break;
+ }
+ }
+
+ if (!found)
+ return 0;
+
+ /* Skip any leading slashes */
+ while (i < cmdline_len && (cmdline[i] == L'/' || cmdline[i] == L'\\'))
+ i++;
+
+ while (--result_len > 0 && i < cmdline_len) {
+ efi_char16_t c = cmdline[i++];
+
+ if (c == L'\0' || c == L'\n' || c == L' ')
+ break;
+ else if (c == L'/')
+ /* Replace UNIX dir separators with EFI standard ones */
+ *result++ = L'\\';
+ else
+ *result++ = c;
+ }
+ *result = L'\0';
+ return i;
+}
+
+/*
+ * Check the cmdline for a LILO-style file= arguments.
+ *
+ * We only support loading a file from the same filesystem as
+ * the kernel image.
+ */
+efi_status_t handle_cmdline_files(efi_loaded_image_t *image,
+ const efi_char16_t *optstr,
+ int optstr_size,
+ unsigned long soft_limit,
+ unsigned long hard_limit,
+ unsigned long *load_addr,
+ unsigned long *load_size)
+{
+ const efi_char16_t *cmdline = image->load_options;
+ int cmdline_len = image->load_options_size;
+ unsigned long efi_chunk_size = ULONG_MAX;
+ efi_file_protocol_t *volume = NULL;
+ efi_file_protocol_t *file;
+ unsigned long alloc_addr;
+ unsigned long alloc_size;
+ efi_status_t status;
+ int offset;
+
+ if (!load_addr || !load_size)
+ return EFI_INVALID_PARAMETER;
+
+ efi_apply_loadoptions_quirk((const void **)&cmdline, &cmdline_len);
+ cmdline_len /= sizeof(*cmdline);
+
+ if (IS_ENABLED(CONFIG_X86) && !efi_nochunk)
+ efi_chunk_size = EFI_READ_CHUNK_SIZE;
+
+ alloc_addr = alloc_size = 0;
+ do {
+ struct finfo fi;
+ unsigned long size;
+ void *addr;
+
+ offset = find_file_option(cmdline, cmdline_len,
+ optstr, optstr_size,
+ fi.filename, ARRAY_SIZE(fi.filename));
+
+ if (!offset)
+ break;
+
+ cmdline += offset;
+ cmdline_len -= offset;
+
+ if (!volume) {
+ status = efi_open_volume(image, &volume);
+ if (status != EFI_SUCCESS)
+ return status;
+ }
+
+ status = efi_open_file(volume, &fi, &file, &size);
+ if (status != EFI_SUCCESS)
+ goto err_close_volume;
+
+ /*
+ * Check whether the existing allocation can contain the next
+ * file. This condition will also trigger naturally during the
+ * first (and typically only) iteration of the loop, given that
+ * alloc_size == 0 in that case.
+ */
+ if (round_up(alloc_size + size, EFI_ALLOC_ALIGN) >
+ round_up(alloc_size, EFI_ALLOC_ALIGN)) {
+ unsigned long old_addr = alloc_addr;
+
+ status = EFI_OUT_OF_RESOURCES;
+ if (soft_limit < hard_limit)
+ status = efi_allocate_pages(alloc_size + size,
+ &alloc_addr,
+ soft_limit);
+ if (status == EFI_OUT_OF_RESOURCES)
+ status = efi_allocate_pages(alloc_size + size,
+ &alloc_addr,
+ hard_limit);
+ if (status != EFI_SUCCESS) {
+ efi_err("Failed to allocate memory for files\n");
+ goto err_close_file;
+ }
+
+ if (old_addr != 0) {
+ /*
+ * This is not the first time we've gone
+ * around this loop, and so we are loading
+ * multiple files that need to be concatenated
+ * and returned in a single buffer.
+ */
+ memcpy((void *)alloc_addr, (void *)old_addr, alloc_size);
+ efi_free(alloc_size, old_addr);
+ }
+ }
+
+ addr = (void *)alloc_addr + alloc_size;
+ alloc_size += size;
+
+ while (size) {
+ unsigned long chunksize = min(size, efi_chunk_size);
+
+ status = file->read(file, &chunksize, addr);
+ if (status != EFI_SUCCESS) {
+ efi_err("Failed to read file\n");
+ goto err_close_file;
+ }
+ addr += chunksize;
+ size -= chunksize;
+ }
+ file->close(file);
+ } while (offset > 0);
+
+ *load_addr = alloc_addr;
+ *load_size = alloc_size;
+
+ if (volume)
+ volume->close(volume);
+ return EFI_SUCCESS;
+
+err_close_file:
+ file->close(file);
+
+err_close_volume:
+ volume->close(volume);
+ efi_free(alloc_size, alloc_addr);
+ return status;
+}
diff --git a/drivers/firmware/efi/libstub/gop.c b/drivers/firmware/efi/libstub/gop.c
index b7bf1e9..ea5da30 100644
--- a/drivers/firmware/efi/libstub/gop.c
+++ b/drivers/firmware/efi/libstub/gop.c
@@ -5,270 +5,546 @@
*
* ----------------------------------------------------------------------- */
+#include <linux/bitops.h>
+#include <linux/ctype.h>
#include <linux/efi.h>
#include <linux/screen_info.h>
+#include <linux/string.h>
#include <asm/efi.h>
#include <asm/setup.h>
-static void find_bits(unsigned long mask, u8 *pos, u8 *size)
+#include "efistub.h"
+
+enum efi_cmdline_option {
+ EFI_CMDLINE_NONE,
+ EFI_CMDLINE_MODE_NUM,
+ EFI_CMDLINE_RES,
+ EFI_CMDLINE_AUTO,
+ EFI_CMDLINE_LIST
+};
+
+static struct {
+ enum efi_cmdline_option option;
+ union {
+ u32 mode;
+ struct {
+ u32 width, height;
+ int format;
+ u8 depth;
+ } res;
+ };
+} cmdline = { .option = EFI_CMDLINE_NONE };
+
+static bool parse_modenum(char *option, char **next)
{
- u8 first, len;
+ u32 m;
- first = 0;
- len = 0;
+ if (!strstarts(option, "mode="))
+ return false;
+ option += strlen("mode=");
+ m = simple_strtoull(option, &option, 0);
+ if (*option && *option++ != ',')
+ return false;
+ cmdline.option = EFI_CMDLINE_MODE_NUM;
+ cmdline.mode = m;
- if (mask) {
- while (!(mask & 0x1)) {
- mask = mask >> 1;
- first++;
- }
+ *next = option;
+ return true;
+}
- while (mask & 0x1) {
- mask = mask >> 1;
- len++;
+static bool parse_res(char *option, char **next)
+{
+ u32 w, h, d = 0;
+ int pf = -1;
+
+ if (!isdigit(*option))
+ return false;
+ w = simple_strtoull(option, &option, 10);
+ if (*option++ != 'x' || !isdigit(*option))
+ return false;
+ h = simple_strtoull(option, &option, 10);
+ if (*option == '-') {
+ option++;
+ if (strstarts(option, "rgb")) {
+ option += strlen("rgb");
+ pf = PIXEL_RGB_RESERVED_8BIT_PER_COLOR;
+ } else if (strstarts(option, "bgr")) {
+ option += strlen("bgr");
+ pf = PIXEL_BGR_RESERVED_8BIT_PER_COLOR;
+ } else if (isdigit(*option))
+ d = simple_strtoull(option, &option, 10);
+ else
+ return false;
+ }
+ if (*option && *option++ != ',')
+ return false;
+ cmdline.option = EFI_CMDLINE_RES;
+ cmdline.res.width = w;
+ cmdline.res.height = h;
+ cmdline.res.format = pf;
+ cmdline.res.depth = d;
+
+ *next = option;
+ return true;
+}
+
+static bool parse_auto(char *option, char **next)
+{
+ if (!strstarts(option, "auto"))
+ return false;
+ option += strlen("auto");
+ if (*option && *option++ != ',')
+ return false;
+ cmdline.option = EFI_CMDLINE_AUTO;
+
+ *next = option;
+ return true;
+}
+
+static bool parse_list(char *option, char **next)
+{
+ if (!strstarts(option, "list"))
+ return false;
+ option += strlen("list");
+ if (*option && *option++ != ',')
+ return false;
+ cmdline.option = EFI_CMDLINE_LIST;
+
+ *next = option;
+ return true;
+}
+
+void efi_parse_option_graphics(char *option)
+{
+ while (*option) {
+ if (parse_modenum(option, &option))
+ continue;
+ if (parse_res(option, &option))
+ continue;
+ if (parse_auto(option, &option))
+ continue;
+ if (parse_list(option, &option))
+ continue;
+
+ while (*option && *option++ != ',')
+ ;
+ }
+}
+
+static u32 choose_mode_modenum(efi_graphics_output_protocol_t *gop)
+{
+ efi_status_t status;
+
+ efi_graphics_output_protocol_mode_t *mode;
+ efi_graphics_output_mode_info_t *info;
+ unsigned long info_size;
+
+ u32 max_mode, cur_mode;
+ int pf;
+
+ mode = efi_table_attr(gop, mode);
+
+ cur_mode = efi_table_attr(mode, mode);
+ if (cmdline.mode == cur_mode)
+ return cur_mode;
+
+ max_mode = efi_table_attr(mode, max_mode);
+ if (cmdline.mode >= max_mode) {
+ efi_err("Requested mode is invalid\n");
+ return cur_mode;
+ }
+
+ status = efi_call_proto(gop, query_mode, cmdline.mode,
+ &info_size, &info);
+ if (status != EFI_SUCCESS) {
+ efi_err("Couldn't get mode information\n");
+ return cur_mode;
+ }
+
+ pf = info->pixel_format;
+
+ efi_bs_call(free_pool, info);
+
+ if (pf == PIXEL_BLT_ONLY || pf >= PIXEL_FORMAT_MAX) {
+ efi_err("Invalid PixelFormat\n");
+ return cur_mode;
+ }
+
+ return cmdline.mode;
+}
+
+static u8 pixel_bpp(int pixel_format, efi_pixel_bitmask_t pixel_info)
+{
+ if (pixel_format == PIXEL_BIT_MASK) {
+ u32 mask = pixel_info.red_mask | pixel_info.green_mask |
+ pixel_info.blue_mask | pixel_info.reserved_mask;
+ if (!mask)
+ return 0;
+ return __fls(mask) - __ffs(mask) + 1;
+ } else
+ return 32;
+}
+
+static u32 choose_mode_res(efi_graphics_output_protocol_t *gop)
+{
+ efi_status_t status;
+
+ efi_graphics_output_protocol_mode_t *mode;
+ efi_graphics_output_mode_info_t *info;
+ unsigned long info_size;
+
+ u32 max_mode, cur_mode;
+ int pf;
+ efi_pixel_bitmask_t pi;
+ u32 m, w, h;
+
+ mode = efi_table_attr(gop, mode);
+
+ cur_mode = efi_table_attr(mode, mode);
+ info = efi_table_attr(mode, info);
+ pf = info->pixel_format;
+ pi = info->pixel_information;
+ w = info->horizontal_resolution;
+ h = info->vertical_resolution;
+
+ if (w == cmdline.res.width && h == cmdline.res.height &&
+ (cmdline.res.format < 0 || cmdline.res.format == pf) &&
+ (!cmdline.res.depth || cmdline.res.depth == pixel_bpp(pf, pi)))
+ return cur_mode;
+
+ max_mode = efi_table_attr(mode, max_mode);
+
+ for (m = 0; m < max_mode; m++) {
+ if (m == cur_mode)
+ continue;
+
+ status = efi_call_proto(gop, query_mode, m,
+ &info_size, &info);
+ if (status != EFI_SUCCESS)
+ continue;
+
+ pf = info->pixel_format;
+ pi = info->pixel_information;
+ w = info->horizontal_resolution;
+ h = info->vertical_resolution;
+
+ efi_bs_call(free_pool, info);
+
+ if (pf == PIXEL_BLT_ONLY || pf >= PIXEL_FORMAT_MAX)
+ continue;
+ if (w == cmdline.res.width && h == cmdline.res.height &&
+ (cmdline.res.format < 0 || cmdline.res.format == pf) &&
+ (!cmdline.res.depth || cmdline.res.depth == pixel_bpp(pf, pi)))
+ return m;
+ }
+
+ efi_err("Couldn't find requested mode\n");
+
+ return cur_mode;
+}
+
+static u32 choose_mode_auto(efi_graphics_output_protocol_t *gop)
+{
+ efi_status_t status;
+
+ efi_graphics_output_protocol_mode_t *mode;
+ efi_graphics_output_mode_info_t *info;
+ unsigned long info_size;
+
+ u32 max_mode, cur_mode, best_mode, area;
+ u8 depth;
+ int pf;
+ efi_pixel_bitmask_t pi;
+ u32 m, w, h, a;
+ u8 d;
+
+ mode = efi_table_attr(gop, mode);
+
+ cur_mode = efi_table_attr(mode, mode);
+ max_mode = efi_table_attr(mode, max_mode);
+
+ info = efi_table_attr(mode, info);
+
+ pf = info->pixel_format;
+ pi = info->pixel_information;
+ w = info->horizontal_resolution;
+ h = info->vertical_resolution;
+
+ best_mode = cur_mode;
+ area = w * h;
+ depth = pixel_bpp(pf, pi);
+
+ for (m = 0; m < max_mode; m++) {
+ if (m == cur_mode)
+ continue;
+
+ status = efi_call_proto(gop, query_mode, m,
+ &info_size, &info);
+ if (status != EFI_SUCCESS)
+ continue;
+
+ pf = info->pixel_format;
+ pi = info->pixel_information;
+ w = info->horizontal_resolution;
+ h = info->vertical_resolution;
+
+ efi_bs_call(free_pool, info);
+
+ if (pf == PIXEL_BLT_ONLY || pf >= PIXEL_FORMAT_MAX)
+ continue;
+ a = w * h;
+ if (a < area)
+ continue;
+ d = pixel_bpp(pf, pi);
+ if (a > area || d > depth) {
+ best_mode = m;
+ area = a;
+ depth = d;
}
}
- *pos = first;
- *size = len;
+ return best_mode;
+}
+
+static u32 choose_mode_list(efi_graphics_output_protocol_t *gop)
+{
+ efi_status_t status;
+
+ efi_graphics_output_protocol_mode_t *mode;
+ efi_graphics_output_mode_info_t *info;
+ unsigned long info_size;
+
+ u32 max_mode, cur_mode;
+ int pf;
+ efi_pixel_bitmask_t pi;
+ u32 m, w, h;
+ u8 d;
+ const char *dstr;
+ bool valid;
+ efi_input_key_t key;
+
+ mode = efi_table_attr(gop, mode);
+
+ cur_mode = efi_table_attr(mode, mode);
+ max_mode = efi_table_attr(mode, max_mode);
+
+ efi_printk("Available graphics modes are 0-%u\n", max_mode-1);
+ efi_puts(" * = current mode\n"
+ " - = unusable mode\n");
+ for (m = 0; m < max_mode; m++) {
+ status = efi_call_proto(gop, query_mode, m,
+ &info_size, &info);
+ if (status != EFI_SUCCESS)
+ continue;
+
+ pf = info->pixel_format;
+ pi = info->pixel_information;
+ w = info->horizontal_resolution;
+ h = info->vertical_resolution;
+
+ efi_bs_call(free_pool, info);
+
+ valid = !(pf == PIXEL_BLT_ONLY || pf >= PIXEL_FORMAT_MAX);
+ d = 0;
+ switch (pf) {
+ case PIXEL_RGB_RESERVED_8BIT_PER_COLOR:
+ dstr = "rgb";
+ break;
+ case PIXEL_BGR_RESERVED_8BIT_PER_COLOR:
+ dstr = "bgr";
+ break;
+ case PIXEL_BIT_MASK:
+ dstr = "";
+ d = pixel_bpp(pf, pi);
+ break;
+ case PIXEL_BLT_ONLY:
+ dstr = "blt";
+ break;
+ default:
+ dstr = "xxx";
+ break;
+ }
+
+ efi_printk("Mode %3u %c%c: Resolution %ux%u-%s%.0hhu\n",
+ m,
+ m == cur_mode ? '*' : ' ',
+ !valid ? '-' : ' ',
+ w, h, dstr, d);
+ }
+
+ efi_puts("\nPress any key to continue (or wait 10 seconds)\n");
+ status = efi_wait_for_key(10 * EFI_USEC_PER_SEC, &key);
+ if (status != EFI_SUCCESS && status != EFI_TIMEOUT) {
+ efi_err("Unable to read key, continuing in 10 seconds\n");
+ efi_bs_call(stall, 10 * EFI_USEC_PER_SEC);
+ }
+
+ return cur_mode;
+}
+
+static void set_mode(efi_graphics_output_protocol_t *gop)
+{
+ efi_graphics_output_protocol_mode_t *mode;
+ u32 cur_mode, new_mode;
+
+ switch (cmdline.option) {
+ case EFI_CMDLINE_MODE_NUM:
+ new_mode = choose_mode_modenum(gop);
+ break;
+ case EFI_CMDLINE_RES:
+ new_mode = choose_mode_res(gop);
+ break;
+ case EFI_CMDLINE_AUTO:
+ new_mode = choose_mode_auto(gop);
+ break;
+ case EFI_CMDLINE_LIST:
+ new_mode = choose_mode_list(gop);
+ break;
+ default:
+ return;
+ }
+
+ mode = efi_table_attr(gop, mode);
+ cur_mode = efi_table_attr(mode, mode);
+
+ if (new_mode == cur_mode)
+ return;
+
+ if (efi_call_proto(gop, set_mode, new_mode) != EFI_SUCCESS)
+ efi_err("Failed to set requested mode\n");
+}
+
+static void find_bits(u32 mask, u8 *pos, u8 *size)
+{
+ if (!mask) {
+ *pos = *size = 0;
+ return;
+ }
+
+ /* UEFI spec guarantees that the set bits are contiguous */
+ *pos = __ffs(mask);
+ *size = __fls(mask) - *pos + 1;
}
static void
setup_pixel_info(struct screen_info *si, u32 pixels_per_scan_line,
- struct efi_pixel_bitmask pixel_info, int pixel_format)
+ efi_pixel_bitmask_t pixel_info, int pixel_format)
{
- if (pixel_format == PIXEL_RGB_RESERVED_8BIT_PER_COLOR) {
- si->lfb_depth = 32;
- si->lfb_linelength = pixels_per_scan_line * 4;
- si->red_size = 8;
- si->red_pos = 0;
- si->green_size = 8;
- si->green_pos = 8;
- si->blue_size = 8;
- si->blue_pos = 16;
- si->rsvd_size = 8;
- si->rsvd_pos = 24;
- } else if (pixel_format == PIXEL_BGR_RESERVED_8BIT_PER_COLOR) {
- si->lfb_depth = 32;
- si->lfb_linelength = pixels_per_scan_line * 4;
- si->red_size = 8;
- si->red_pos = 16;
- si->green_size = 8;
- si->green_pos = 8;
- si->blue_size = 8;
- si->blue_pos = 0;
- si->rsvd_size = 8;
- si->rsvd_pos = 24;
- } else if (pixel_format == PIXEL_BIT_MASK) {
- find_bits(pixel_info.red_mask, &si->red_pos, &si->red_size);
- find_bits(pixel_info.green_mask, &si->green_pos,
- &si->green_size);
- find_bits(pixel_info.blue_mask, &si->blue_pos, &si->blue_size);
- find_bits(pixel_info.reserved_mask, &si->rsvd_pos,
- &si->rsvd_size);
+ if (pixel_format == PIXEL_BIT_MASK) {
+ find_bits(pixel_info.red_mask,
+ &si->red_pos, &si->red_size);
+ find_bits(pixel_info.green_mask,
+ &si->green_pos, &si->green_size);
+ find_bits(pixel_info.blue_mask,
+ &si->blue_pos, &si->blue_size);
+ find_bits(pixel_info.reserved_mask,
+ &si->rsvd_pos, &si->rsvd_size);
si->lfb_depth = si->red_size + si->green_size +
si->blue_size + si->rsvd_size;
si->lfb_linelength = (pixels_per_scan_line * si->lfb_depth) / 8;
} else {
- si->lfb_depth = 4;
- si->lfb_linelength = si->lfb_width / 2;
- si->red_size = 0;
- si->red_pos = 0;
- si->green_size = 0;
- si->green_pos = 0;
- si->blue_size = 0;
- si->blue_pos = 0;
- si->rsvd_size = 0;
- si->rsvd_pos = 0;
+ if (pixel_format == PIXEL_RGB_RESERVED_8BIT_PER_COLOR) {
+ si->red_pos = 0;
+ si->blue_pos = 16;
+ } else /* PIXEL_BGR_RESERVED_8BIT_PER_COLOR */ {
+ si->blue_pos = 0;
+ si->red_pos = 16;
+ }
+
+ si->green_pos = 8;
+ si->rsvd_pos = 24;
+ si->red_size = si->green_size =
+ si->blue_size = si->rsvd_size = 8;
+
+ si->lfb_depth = 32;
+ si->lfb_linelength = pixels_per_scan_line * 4;
}
}
-static efi_status_t
-setup_gop32(efi_system_table_t *sys_table_arg, struct screen_info *si,
- efi_guid_t *proto, unsigned long size, void **gop_handle)
+static efi_graphics_output_protocol_t *
+find_gop(efi_guid_t *proto, unsigned long size, void **handles)
{
- struct efi_graphics_output_protocol_32 *gop32, *first_gop;
- unsigned long nr_gops;
- u16 width, height;
- u32 pixels_per_scan_line;
- u32 ext_lfb_base;
- u64 fb_base;
- struct efi_pixel_bitmask pixel_info;
- int pixel_format;
- efi_status_t status;
- u32 *handles = (u32 *)(unsigned long)gop_handle;
+ efi_graphics_output_protocol_t *first_gop;
+ efi_handle_t h;
int i;
first_gop = NULL;
- gop32 = NULL;
- nr_gops = size / sizeof(u32);
- for (i = 0; i < nr_gops; i++) {
- struct efi_graphics_output_protocol_mode_32 *mode;
- struct efi_graphics_output_mode_info *info = NULL;
+ for_each_efi_handle(h, handles, size, i) {
+ efi_status_t status;
+
+ efi_graphics_output_protocol_t *gop;
+ efi_graphics_output_protocol_mode_t *mode;
+ efi_graphics_output_mode_info_t *info;
+
efi_guid_t conout_proto = EFI_CONSOLE_OUT_DEVICE_GUID;
- bool conout_found = false;
void *dummy = NULL;
- efi_handle_t h = (efi_handle_t)(unsigned long)handles[i];
- u64 current_fb_base;
- status = efi_call_early(handle_protocol, h,
- proto, (void **)&gop32);
+ status = efi_bs_call(handle_protocol, h, proto, (void **)&gop);
if (status != EFI_SUCCESS)
continue;
- status = efi_call_early(handle_protocol, h,
- &conout_proto, &dummy);
+ mode = efi_table_attr(gop, mode);
+ info = efi_table_attr(mode, info);
+ if (info->pixel_format == PIXEL_BLT_ONLY ||
+ info->pixel_format >= PIXEL_FORMAT_MAX)
+ continue;
+
+ /*
+ * Systems that use the UEFI Console Splitter may
+ * provide multiple GOP devices, not all of which are
+ * backed by real hardware. The workaround is to search
+ * for a GOP implementing the ConOut protocol, and if
+ * one isn't found, to just fall back to the first GOP.
+ *
+ * Once we've found a GOP supporting ConOut,
+ * don't bother looking any further.
+ */
+ status = efi_bs_call(handle_protocol, h, &conout_proto, &dummy);
if (status == EFI_SUCCESS)
- conout_found = true;
+ return gop;
- mode = (void *)(unsigned long)gop32->mode;
- info = (void *)(unsigned long)mode->info;
- current_fb_base = mode->frame_buffer_base;
-
- if ((!first_gop || conout_found) &&
- info->pixel_format != PIXEL_BLT_ONLY) {
- /*
- * Systems that use the UEFI Console Splitter may
- * provide multiple GOP devices, not all of which are
- * backed by real hardware. The workaround is to search
- * for a GOP implementing the ConOut protocol, and if
- * one isn't found, to just fall back to the first GOP.
- */
- width = info->horizontal_resolution;
- height = info->vertical_resolution;
- pixel_format = info->pixel_format;
- pixel_info = info->pixel_information;
- pixels_per_scan_line = info->pixels_per_scan_line;
- fb_base = current_fb_base;
-
- /*
- * Once we've found a GOP supporting ConOut,
- * don't bother looking any further.
- */
- first_gop = gop32;
- if (conout_found)
- break;
- }
+ if (!first_gop)
+ first_gop = gop;
}
- /* Did we find any GOPs? */
- if (!first_gop)
- return EFI_NOT_FOUND;
-
- /* EFI framebuffer */
- si->orig_video_isVGA = VIDEO_TYPE_EFI;
-
- si->lfb_width = width;
- si->lfb_height = height;
- si->lfb_base = fb_base;
-
- ext_lfb_base = (u64)(unsigned long)fb_base >> 32;
- if (ext_lfb_base) {
- si->capabilities |= VIDEO_CAPABILITY_64BIT_BASE;
- si->ext_lfb_base = ext_lfb_base;
- }
-
- si->pages = 1;
-
- setup_pixel_info(si, pixels_per_scan_line, pixel_info, pixel_format);
-
- si->lfb_size = si->lfb_linelength * si->lfb_height;
-
- si->capabilities |= VIDEO_CAPABILITY_SKIP_QUIRKS;
-
- return EFI_SUCCESS;
+ return first_gop;
}
-static efi_status_t
-setup_gop64(efi_system_table_t *sys_table_arg, struct screen_info *si,
- efi_guid_t *proto, unsigned long size, void **gop_handle)
+static efi_status_t setup_gop(struct screen_info *si, efi_guid_t *proto,
+ unsigned long size, void **handles)
{
- struct efi_graphics_output_protocol_64 *gop64, *first_gop;
- unsigned long nr_gops;
- u16 width, height;
- u32 pixels_per_scan_line;
- u32 ext_lfb_base;
- u64 fb_base;
- struct efi_pixel_bitmask pixel_info;
- int pixel_format;
- efi_status_t status;
- u64 *handles = (u64 *)(unsigned long)gop_handle;
- int i;
+ efi_graphics_output_protocol_t *gop;
+ efi_graphics_output_protocol_mode_t *mode;
+ efi_graphics_output_mode_info_t *info;
- first_gop = NULL;
- gop64 = NULL;
-
- nr_gops = size / sizeof(u64);
- for (i = 0; i < nr_gops; i++) {
- struct efi_graphics_output_protocol_mode_64 *mode;
- struct efi_graphics_output_mode_info *info = NULL;
- efi_guid_t conout_proto = EFI_CONSOLE_OUT_DEVICE_GUID;
- bool conout_found = false;
- void *dummy = NULL;
- efi_handle_t h = (efi_handle_t)(unsigned long)handles[i];
- u64 current_fb_base;
-
- status = efi_call_early(handle_protocol, h,
- proto, (void **)&gop64);
- if (status != EFI_SUCCESS)
- continue;
-
- status = efi_call_early(handle_protocol, h,
- &conout_proto, &dummy);
- if (status == EFI_SUCCESS)
- conout_found = true;
-
- mode = (void *)(unsigned long)gop64->mode;
- info = (void *)(unsigned long)mode->info;
- current_fb_base = mode->frame_buffer_base;
-
- if ((!first_gop || conout_found) &&
- info->pixel_format != PIXEL_BLT_ONLY) {
- /*
- * Systems that use the UEFI Console Splitter may
- * provide multiple GOP devices, not all of which are
- * backed by real hardware. The workaround is to search
- * for a GOP implementing the ConOut protocol, and if
- * one isn't found, to just fall back to the first GOP.
- */
- width = info->horizontal_resolution;
- height = info->vertical_resolution;
- pixel_format = info->pixel_format;
- pixel_info = info->pixel_information;
- pixels_per_scan_line = info->pixels_per_scan_line;
- fb_base = current_fb_base;
-
- /*
- * Once we've found a GOP supporting ConOut,
- * don't bother looking any further.
- */
- first_gop = gop64;
- if (conout_found)
- break;
- }
- }
+ gop = find_gop(proto, size, handles);
/* Did we find any GOPs? */
- if (!first_gop)
+ if (!gop)
return EFI_NOT_FOUND;
+ /* Change mode if requested */
+ set_mode(gop);
+
/* EFI framebuffer */
+ mode = efi_table_attr(gop, mode);
+ info = efi_table_attr(mode, info);
+
si->orig_video_isVGA = VIDEO_TYPE_EFI;
- si->lfb_width = width;
- si->lfb_height = height;
- si->lfb_base = fb_base;
+ si->lfb_width = info->horizontal_resolution;
+ si->lfb_height = info->vertical_resolution;
- ext_lfb_base = (u64)(unsigned long)fb_base >> 32;
- if (ext_lfb_base) {
+ efi_set_u64_split(efi_table_attr(mode, frame_buffer_base),
+ &si->lfb_base, &si->ext_lfb_base);
+ if (si->ext_lfb_base)
si->capabilities |= VIDEO_CAPABILITY_64BIT_BASE;
- si->ext_lfb_base = ext_lfb_base;
- }
si->pages = 1;
- setup_pixel_info(si, pixels_per_scan_line, pixel_info, pixel_format);
+ setup_pixel_info(si, info->pixels_per_scan_line,
+ info->pixel_information, info->pixel_format);
si->lfb_size = si->lfb_linelength * si->lfb_height;
@@ -280,33 +556,25 @@
/*
* See if we have Graphics Output Protocol
*/
-efi_status_t efi_setup_gop(efi_system_table_t *sys_table_arg,
- struct screen_info *si, efi_guid_t *proto,
+efi_status_t efi_setup_gop(struct screen_info *si, efi_guid_t *proto,
unsigned long size)
{
efi_status_t status;
void **gop_handle = NULL;
- status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
- size, (void **)&gop_handle);
+ status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size,
+ (void **)&gop_handle);
if (status != EFI_SUCCESS)
return status;
- status = efi_call_early(locate_handle,
- EFI_LOCATE_BY_PROTOCOL,
- proto, NULL, &size, gop_handle);
+ status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, proto, NULL,
+ &size, gop_handle);
if (status != EFI_SUCCESS)
goto free_handle;
- if (efi_is_64bit()) {
- status = setup_gop64(sys_table_arg, si, proto, size,
- gop_handle);
- } else {
- status = setup_gop32(sys_table_arg, si, proto, size,
- gop_handle);
- }
+ status = setup_gop(si, proto, size, gop_handle);
free_handle:
- efi_call_early(free_pool, gop_handle);
+ efi_bs_call(free_pool, gop_handle);
return status;
}
diff --git a/drivers/firmware/efi/libstub/mem.c b/drivers/firmware/efi/libstub/mem.c
new file mode 100644
index 0000000..feef8d4
--- /dev/null
+++ b/drivers/firmware/efi/libstub/mem.c
@@ -0,0 +1,132 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/efi.h>
+#include <asm/efi.h>
+
+#include "efistub.h"
+
+static inline bool mmap_has_headroom(unsigned long buff_size,
+ unsigned long map_size,
+ unsigned long desc_size)
+{
+ unsigned long slack = buff_size - map_size;
+
+ return slack / desc_size >= EFI_MMAP_NR_SLACK_SLOTS;
+}
+
+/**
+ * efi_get_memory_map() - get memory map
+ * @map: on return pointer to memory map
+ *
+ * Retrieve the UEFI memory map. The allocated memory leaves room for
+ * up to EFI_MMAP_NR_SLACK_SLOTS additional memory map entries.
+ *
+ * Return: status code
+ */
+efi_status_t efi_get_memory_map(struct efi_boot_memmap *map)
+{
+ efi_memory_desc_t *m = NULL;
+ efi_status_t status;
+ unsigned long key;
+ u32 desc_version;
+
+ *map->desc_size = sizeof(*m);
+ *map->map_size = *map->desc_size * 32;
+ *map->buff_size = *map->map_size;
+again:
+ status = efi_bs_call(allocate_pool, EFI_LOADER_DATA,
+ *map->map_size, (void **)&m);
+ if (status != EFI_SUCCESS)
+ goto fail;
+
+ *map->desc_size = 0;
+ key = 0;
+ status = efi_bs_call(get_memory_map, map->map_size, m,
+ &key, map->desc_size, &desc_version);
+ if (status == EFI_BUFFER_TOO_SMALL ||
+ !mmap_has_headroom(*map->buff_size, *map->map_size,
+ *map->desc_size)) {
+ efi_bs_call(free_pool, m);
+ /*
+ * Make sure there is some entries of headroom so that the
+ * buffer can be reused for a new map after allocations are
+ * no longer permitted. Its unlikely that the map will grow to
+ * exceed this headroom once we are ready to trigger
+ * ExitBootServices()
+ */
+ *map->map_size += *map->desc_size * EFI_MMAP_NR_SLACK_SLOTS;
+ *map->buff_size = *map->map_size;
+ goto again;
+ }
+
+ if (status == EFI_SUCCESS) {
+ if (map->key_ptr)
+ *map->key_ptr = key;
+ if (map->desc_ver)
+ *map->desc_ver = desc_version;
+ } else {
+ efi_bs_call(free_pool, m);
+ }
+
+fail:
+ *map->map = m;
+ return status;
+}
+
+/**
+ * efi_allocate_pages() - Allocate memory pages
+ * @size: minimum number of bytes to allocate
+ * @addr: On return the address of the first allocated page. The first
+ * allocated page has alignment EFI_ALLOC_ALIGN which is an
+ * architecture dependent multiple of the page size.
+ * @max: the address that the last allocated memory page shall not
+ * exceed
+ *
+ * Allocate pages as EFI_LOADER_DATA. The allocated pages are aligned according
+ * to EFI_ALLOC_ALIGN. The last allocated page will not exceed the address
+ * given by @max.
+ *
+ * Return: status code
+ */
+efi_status_t efi_allocate_pages(unsigned long size, unsigned long *addr,
+ unsigned long max)
+{
+ efi_physical_addr_t alloc_addr;
+ efi_status_t status;
+
+ if (EFI_ALLOC_ALIGN > EFI_PAGE_SIZE)
+ return efi_allocate_pages_aligned(size, addr, max,
+ EFI_ALLOC_ALIGN);
+
+ alloc_addr = ALIGN_DOWN(max + 1, EFI_ALLOC_ALIGN) - 1;
+ status = efi_bs_call(allocate_pages, EFI_ALLOCATE_MAX_ADDRESS,
+ EFI_LOADER_DATA, DIV_ROUND_UP(size, EFI_PAGE_SIZE),
+ &alloc_addr);
+ if (status != EFI_SUCCESS)
+ return status;
+
+ *addr = alloc_addr;
+ return EFI_SUCCESS;
+}
+
+/**
+ * efi_free() - free memory pages
+ * @size: size of the memory area to free in bytes
+ * @addr: start of the memory area to free (must be EFI_PAGE_SIZE
+ * aligned)
+ *
+ * @size is rounded up to a multiple of EFI_ALLOC_ALIGN which is an
+ * architecture specific multiple of EFI_PAGE_SIZE. So this function should
+ * only be used to return pages allocated with efi_allocate_pages() or
+ * efi_low_alloc_above().
+ */
+void efi_free(unsigned long size, unsigned long addr)
+{
+ unsigned long nr_pages;
+
+ if (!size)
+ return;
+
+ nr_pages = round_up(size, EFI_ALLOC_ALIGN) / EFI_PAGE_SIZE;
+ efi_bs_call(free_pages, addr, nr_pages);
+}
diff --git a/drivers/firmware/efi/libstub/pci.c b/drivers/firmware/efi/libstub/pci.c
new file mode 100644
index 0000000..99fb25d
--- /dev/null
+++ b/drivers/firmware/efi/libstub/pci.c
@@ -0,0 +1,114 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * PCI-related functions used by the EFI stub on multiple
+ * architectures.
+ *
+ * Copyright 2019 Google, LLC
+ */
+
+#include <linux/efi.h>
+#include <linux/pci.h>
+
+#include <asm/efi.h>
+
+#include "efistub.h"
+
+void efi_pci_disable_bridge_busmaster(void)
+{
+ efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID;
+ unsigned long pci_handle_size = 0;
+ efi_handle_t *pci_handle = NULL;
+ efi_handle_t handle;
+ efi_status_t status;
+ u16 class, command;
+ int i;
+
+ status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, &pci_proto,
+ NULL, &pci_handle_size, NULL);
+
+ if (status != EFI_BUFFER_TOO_SMALL) {
+ if (status != EFI_SUCCESS && status != EFI_NOT_FOUND)
+ efi_err("Failed to locate PCI I/O handles'\n");
+ return;
+ }
+
+ status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, pci_handle_size,
+ (void **)&pci_handle);
+ if (status != EFI_SUCCESS) {
+ efi_err("Failed to allocate memory for 'pci_handle'\n");
+ return;
+ }
+
+ status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, &pci_proto,
+ NULL, &pci_handle_size, pci_handle);
+ if (status != EFI_SUCCESS) {
+ efi_err("Failed to locate PCI I/O handles'\n");
+ goto free_handle;
+ }
+
+ for_each_efi_handle(handle, pci_handle, pci_handle_size, i) {
+ efi_pci_io_protocol_t *pci;
+ unsigned long segment_nr, bus_nr, device_nr, func_nr;
+
+ status = efi_bs_call(handle_protocol, handle, &pci_proto,
+ (void **)&pci);
+ if (status != EFI_SUCCESS)
+ continue;
+
+ /*
+ * Disregard devices living on bus 0 - these are not behind a
+ * bridge so no point in disconnecting them from their drivers.
+ */
+ status = efi_call_proto(pci, get_location, &segment_nr, &bus_nr,
+ &device_nr, &func_nr);
+ if (status != EFI_SUCCESS || bus_nr == 0)
+ continue;
+
+ /*
+ * Don't disconnect VGA controllers so we don't risk losing
+ * access to the framebuffer. Drivers for true PCIe graphics
+ * controllers that are behind a PCIe root port do not use
+ * DMA to implement the GOP framebuffer anyway [although they
+ * may use it in their implementation of Gop->Blt()], and so
+ * disabling DMA in the PCI bridge should not interfere with
+ * normal operation of the device.
+ */
+ status = efi_call_proto(pci, pci.read, EfiPciIoWidthUint16,
+ PCI_CLASS_DEVICE, 1, &class);
+ if (status != EFI_SUCCESS || class == PCI_CLASS_DISPLAY_VGA)
+ continue;
+
+ /* Disconnect this handle from all its drivers */
+ efi_bs_call(disconnect_controller, handle, NULL, NULL);
+ }
+
+ for_each_efi_handle(handle, pci_handle, pci_handle_size, i) {
+ efi_pci_io_protocol_t *pci;
+
+ status = efi_bs_call(handle_protocol, handle, &pci_proto,
+ (void **)&pci);
+ if (status != EFI_SUCCESS || !pci)
+ continue;
+
+ status = efi_call_proto(pci, pci.read, EfiPciIoWidthUint16,
+ PCI_CLASS_DEVICE, 1, &class);
+
+ if (status != EFI_SUCCESS || class != PCI_CLASS_BRIDGE_PCI)
+ continue;
+
+ /* Disable busmastering */
+ status = efi_call_proto(pci, pci.read, EfiPciIoWidthUint16,
+ PCI_COMMAND, 1, &command);
+ if (status != EFI_SUCCESS || !(command & PCI_COMMAND_MASTER))
+ continue;
+
+ command &= ~PCI_COMMAND_MASTER;
+ status = efi_call_proto(pci, pci.write, EfiPciIoWidthUint16,
+ PCI_COMMAND, 1, &command);
+ if (status != EFI_SUCCESS)
+ efi_err("Failed to disable PCI busmastering\n");
+ }
+
+free_handle:
+ efi_bs_call(free_pool, pci_handle);
+}
diff --git a/drivers/firmware/efi/libstub/random.c b/drivers/firmware/efi/libstub/random.c
index b4b1d1d..24aa375 100644
--- a/drivers/firmware/efi/libstub/random.c
+++ b/drivers/firmware/efi/libstub/random.c
@@ -4,185 +4,105 @@
*/
#include <linux/efi.h>
-#include <linux/log2.h>
#include <asm/efi.h>
#include "efistub.h"
-struct efi_rng_protocol {
- efi_status_t (*get_info)(struct efi_rng_protocol *,
- unsigned long *, efi_guid_t *);
- efi_status_t (*get_rng)(struct efi_rng_protocol *,
- efi_guid_t *, unsigned long, u8 *out);
+typedef union efi_rng_protocol efi_rng_protocol_t;
+
+union efi_rng_protocol {
+ struct {
+ efi_status_t (__efiapi *get_info)(efi_rng_protocol_t *,
+ unsigned long *,
+ efi_guid_t *);
+ efi_status_t (__efiapi *get_rng)(efi_rng_protocol_t *,
+ efi_guid_t *, unsigned long,
+ u8 *out);
+ };
+ struct {
+ u32 get_info;
+ u32 get_rng;
+ } mixed_mode;
};
-efi_status_t efi_get_random_bytes(efi_system_table_t *sys_table_arg,
- unsigned long size, u8 *out)
+/**
+ * efi_get_random_bytes() - fill a buffer with random bytes
+ * @size: size of the buffer
+ * @out: caller allocated buffer to receive the random bytes
+ *
+ * The call will fail if either the firmware does not implement the
+ * EFI_RNG_PROTOCOL or there are not enough random bytes available to fill
+ * the buffer.
+ *
+ * Return: status code
+ */
+efi_status_t efi_get_random_bytes(unsigned long size, u8 *out)
{
efi_guid_t rng_proto = EFI_RNG_PROTOCOL_GUID;
efi_status_t status;
- struct efi_rng_protocol *rng;
+ efi_rng_protocol_t *rng = NULL;
- status = efi_call_early(locate_protocol, &rng_proto, NULL,
- (void **)&rng);
+ status = efi_bs_call(locate_protocol, &rng_proto, NULL, (void **)&rng);
if (status != EFI_SUCCESS)
return status;
- return rng->get_rng(rng, NULL, size, out);
+ return efi_call_proto(rng, get_rng, NULL, size, out);
}
-/*
- * Return the number of slots covered by this entry, i.e., the number of
- * addresses it covers that are suitably aligned and supply enough room
- * for the allocation.
+/**
+ * efi_random_get_seed() - provide random seed as configuration table
+ *
+ * The EFI_RNG_PROTOCOL is used to read random bytes. These random bytes are
+ * saved as a configuration table which can be used as entropy by the kernel
+ * for the initialization of its pseudo random number generator.
+ *
+ * If the EFI_RNG_PROTOCOL is not available or there are not enough random bytes
+ * available, the configuration table will not be installed and an error code
+ * will be returned.
+ *
+ * Return: status code
*/
-static unsigned long get_entry_num_slots(efi_memory_desc_t *md,
- unsigned long size,
- unsigned long align_shift)
-{
- unsigned long align = 1UL << align_shift;
- u64 first_slot, last_slot, region_end;
-
- if (md->type != EFI_CONVENTIONAL_MEMORY)
- return 0;
-
- region_end = min((u64)ULONG_MAX, md->phys_addr + md->num_pages*EFI_PAGE_SIZE - 1);
-
- first_slot = round_up(md->phys_addr, align);
- last_slot = round_down(region_end - size + 1, align);
-
- if (first_slot > last_slot)
- return 0;
-
- return ((unsigned long)(last_slot - first_slot) >> align_shift) + 1;
-}
-
-/*
- * The UEFI memory descriptors have a virtual address field that is only used
- * when installing the virtual mapping using SetVirtualAddressMap(). Since it
- * is unused here, we can reuse it to keep track of each descriptor's slot
- * count.
- */
-#define MD_NUM_SLOTS(md) ((md)->virt_addr)
-
-efi_status_t efi_random_alloc(efi_system_table_t *sys_table_arg,
- unsigned long size,
- unsigned long align,
- unsigned long *addr,
- unsigned long random_seed)
-{
- unsigned long map_size, desc_size, total_slots = 0, target_slot;
- unsigned long buff_size;
- efi_status_t status;
- efi_memory_desc_t *memory_map;
- int map_offset;
- struct efi_boot_memmap map;
-
- map.map = &memory_map;
- map.map_size = &map_size;
- map.desc_size = &desc_size;
- map.desc_ver = NULL;
- map.key_ptr = NULL;
- map.buff_size = &buff_size;
-
- status = efi_get_memory_map(sys_table_arg, &map);
- if (status != EFI_SUCCESS)
- return status;
-
- if (align < EFI_ALLOC_ALIGN)
- align = EFI_ALLOC_ALIGN;
-
- /* count the suitable slots in each memory map entry */
- for (map_offset = 0; map_offset < map_size; map_offset += desc_size) {
- efi_memory_desc_t *md = (void *)memory_map + map_offset;
- unsigned long slots;
-
- slots = get_entry_num_slots(md, size, ilog2(align));
- MD_NUM_SLOTS(md) = slots;
- total_slots += slots;
- }
-
- /* find a random number between 0 and total_slots */
- target_slot = (total_slots * (u16)random_seed) >> 16;
-
- /*
- * target_slot is now a value in the range [0, total_slots), and so
- * it corresponds with exactly one of the suitable slots we recorded
- * when iterating over the memory map the first time around.
- *
- * So iterate over the memory map again, subtracting the number of
- * slots of each entry at each iteration, until we have found the entry
- * that covers our chosen slot. Use the residual value of target_slot
- * to calculate the randomly chosen address, and allocate it directly
- * using EFI_ALLOCATE_ADDRESS.
- */
- for (map_offset = 0; map_offset < map_size; map_offset += desc_size) {
- efi_memory_desc_t *md = (void *)memory_map + map_offset;
- efi_physical_addr_t target;
- unsigned long pages;
-
- if (target_slot >= MD_NUM_SLOTS(md)) {
- target_slot -= MD_NUM_SLOTS(md);
- continue;
- }
-
- target = round_up(md->phys_addr, align) + target_slot * align;
- pages = round_up(size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
-
- status = efi_call_early(allocate_pages, EFI_ALLOCATE_ADDRESS,
- EFI_LOADER_DATA, pages, &target);
- if (status == EFI_SUCCESS)
- *addr = target;
- break;
- }
-
- efi_call_early(free_pool, memory_map);
-
- return status;
-}
-
-efi_status_t efi_random_get_seed(efi_system_table_t *sys_table_arg)
+efi_status_t efi_random_get_seed(void)
{
efi_guid_t rng_proto = EFI_RNG_PROTOCOL_GUID;
efi_guid_t rng_algo_raw = EFI_RNG_ALGORITHM_RAW;
efi_guid_t rng_table_guid = LINUX_EFI_RANDOM_SEED_TABLE_GUID;
- struct efi_rng_protocol *rng;
- struct linux_efi_random_seed *seed;
+ efi_rng_protocol_t *rng = NULL;
+ struct linux_efi_random_seed *seed = NULL;
efi_status_t status;
- status = efi_call_early(locate_protocol, &rng_proto, NULL,
- (void **)&rng);
+ status = efi_bs_call(locate_protocol, &rng_proto, NULL, (void **)&rng);
if (status != EFI_SUCCESS)
return status;
- status = efi_call_early(allocate_pool, EFI_RUNTIME_SERVICES_DATA,
- sizeof(*seed) + EFI_RANDOM_SEED_SIZE,
- (void **)&seed);
+ status = efi_bs_call(allocate_pool, EFI_RUNTIME_SERVICES_DATA,
+ sizeof(*seed) + EFI_RANDOM_SEED_SIZE,
+ (void **)&seed);
if (status != EFI_SUCCESS)
return status;
- status = rng->get_rng(rng, &rng_algo_raw, EFI_RANDOM_SEED_SIZE,
- seed->bits);
+ status = efi_call_proto(rng, get_rng, &rng_algo_raw,
+ EFI_RANDOM_SEED_SIZE, seed->bits);
+
if (status == EFI_UNSUPPORTED)
/*
* Use whatever algorithm we have available if the raw algorithm
* is not implemented.
*/
- status = rng->get_rng(rng, NULL, EFI_RANDOM_SEED_SIZE,
- seed->bits);
+ status = efi_call_proto(rng, get_rng, NULL,
+ EFI_RANDOM_SEED_SIZE, seed->bits);
if (status != EFI_SUCCESS)
goto err_freepool;
seed->size = EFI_RANDOM_SEED_SIZE;
- status = efi_call_early(install_configuration_table, &rng_table_guid,
- seed);
+ status = efi_bs_call(install_configuration_table, &rng_table_guid, seed);
if (status != EFI_SUCCESS)
goto err_freepool;
return EFI_SUCCESS;
err_freepool:
- efi_call_early(free_pool, seed);
+ efi_bs_call(free_pool, seed);
return status;
}
diff --git a/drivers/firmware/efi/libstub/randomalloc.c b/drivers/firmware/efi/libstub/randomalloc.c
new file mode 100644
index 0000000..724155b
--- /dev/null
+++ b/drivers/firmware/efi/libstub/randomalloc.c
@@ -0,0 +1,128 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2016 Linaro Ltd; <ard.biesheuvel@linaro.org>
+ */
+
+#include <linux/efi.h>
+#include <linux/log2.h>
+#include <asm/efi.h>
+
+#include "efistub.h"
+
+/*
+ * Return the number of slots covered by this entry, i.e., the number of
+ * addresses it covers that are suitably aligned and supply enough room
+ * for the allocation.
+ */
+static unsigned long get_entry_num_slots(efi_memory_desc_t *md,
+ unsigned long size,
+ unsigned long align_shift)
+{
+ unsigned long align = 1UL << align_shift;
+ u64 first_slot, last_slot, region_end;
+
+ if (md->type != EFI_CONVENTIONAL_MEMORY)
+ return 0;
+
+ if (efi_soft_reserve_enabled() &&
+ (md->attribute & EFI_MEMORY_SP))
+ return 0;
+
+ region_end = min(md->phys_addr + md->num_pages * EFI_PAGE_SIZE - 1,
+ (u64)ULONG_MAX);
+ if (region_end < size)
+ return 0;
+
+ first_slot = round_up(md->phys_addr, align);
+ last_slot = round_down(region_end - size + 1, align);
+
+ if (first_slot > last_slot)
+ return 0;
+
+ return ((unsigned long)(last_slot - first_slot) >> align_shift) + 1;
+}
+
+/*
+ * The UEFI memory descriptors have a virtual address field that is only used
+ * when installing the virtual mapping using SetVirtualAddressMap(). Since it
+ * is unused here, we can reuse it to keep track of each descriptor's slot
+ * count.
+ */
+#define MD_NUM_SLOTS(md) ((md)->virt_addr)
+
+efi_status_t efi_random_alloc(unsigned long size,
+ unsigned long align,
+ unsigned long *addr,
+ unsigned long random_seed)
+{
+ unsigned long map_size, desc_size, total_slots = 0, target_slot;
+ unsigned long buff_size;
+ efi_status_t status;
+ efi_memory_desc_t *memory_map;
+ int map_offset;
+ struct efi_boot_memmap map;
+
+ map.map = &memory_map;
+ map.map_size = &map_size;
+ map.desc_size = &desc_size;
+ map.desc_ver = NULL;
+ map.key_ptr = NULL;
+ map.buff_size = &buff_size;
+
+ status = efi_get_memory_map(&map);
+ if (status != EFI_SUCCESS)
+ return status;
+
+ if (align < EFI_ALLOC_ALIGN)
+ align = EFI_ALLOC_ALIGN;
+
+ size = round_up(size, EFI_ALLOC_ALIGN);
+
+ /* count the suitable slots in each memory map entry */
+ for (map_offset = 0; map_offset < map_size; map_offset += desc_size) {
+ efi_memory_desc_t *md = (void *)memory_map + map_offset;
+ unsigned long slots;
+
+ slots = get_entry_num_slots(md, size, ilog2(align));
+ MD_NUM_SLOTS(md) = slots;
+ total_slots += slots;
+ }
+
+ /* find a random number between 0 and total_slots */
+ target_slot = (total_slots * (u64)(random_seed & U32_MAX)) >> 32;
+
+ /*
+ * target_slot is now a value in the range [0, total_slots), and so
+ * it corresponds with exactly one of the suitable slots we recorded
+ * when iterating over the memory map the first time around.
+ *
+ * So iterate over the memory map again, subtracting the number of
+ * slots of each entry at each iteration, until we have found the entry
+ * that covers our chosen slot. Use the residual value of target_slot
+ * to calculate the randomly chosen address, and allocate it directly
+ * using EFI_ALLOCATE_ADDRESS.
+ */
+ for (map_offset = 0; map_offset < map_size; map_offset += desc_size) {
+ efi_memory_desc_t *md = (void *)memory_map + map_offset;
+ efi_physical_addr_t target;
+ unsigned long pages;
+
+ if (target_slot >= MD_NUM_SLOTS(md)) {
+ target_slot -= MD_NUM_SLOTS(md);
+ continue;
+ }
+
+ target = round_up(md->phys_addr, align) + target_slot * align;
+ pages = size / EFI_PAGE_SIZE;
+
+ status = efi_bs_call(allocate_pages, EFI_ALLOCATE_ADDRESS,
+ EFI_LOADER_DATA, pages, &target);
+ if (status == EFI_SUCCESS)
+ *addr = target;
+ break;
+ }
+
+ efi_bs_call(free_pool, memory_map);
+
+ return status;
+}
diff --git a/drivers/firmware/efi/libstub/relocate.c b/drivers/firmware/efi/libstub/relocate.c
new file mode 100644
index 0000000..8ee9eb2
--- /dev/null
+++ b/drivers/firmware/efi/libstub/relocate.c
@@ -0,0 +1,174 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/efi.h>
+#include <asm/efi.h>
+
+#include "efistub.h"
+
+/**
+ * efi_low_alloc_above() - allocate pages at or above given address
+ * @size: size of the memory area to allocate
+ * @align: minimum alignment of the allocated memory area. It should
+ * a power of two.
+ * @addr: on exit the address of the allocated memory
+ * @min: minimum address to used for the memory allocation
+ *
+ * Allocate at the lowest possible address that is not below @min as
+ * EFI_LOADER_DATA. The allocated pages are aligned according to @align but at
+ * least EFI_ALLOC_ALIGN. The first allocated page will not below the address
+ * given by @min.
+ *
+ * Return: status code
+ */
+efi_status_t efi_low_alloc_above(unsigned long size, unsigned long align,
+ unsigned long *addr, unsigned long min)
+{
+ unsigned long map_size, desc_size, buff_size;
+ efi_memory_desc_t *map;
+ efi_status_t status;
+ unsigned long nr_pages;
+ int i;
+ struct efi_boot_memmap boot_map;
+
+ boot_map.map = ↦
+ boot_map.map_size = &map_size;
+ boot_map.desc_size = &desc_size;
+ boot_map.desc_ver = NULL;
+ boot_map.key_ptr = NULL;
+ boot_map.buff_size = &buff_size;
+
+ status = efi_get_memory_map(&boot_map);
+ if (status != EFI_SUCCESS)
+ goto fail;
+
+ /*
+ * Enforce minimum alignment that EFI or Linux requires when
+ * requesting a specific address. We are doing page-based (or
+ * larger) allocations, and both the address and size must meet
+ * alignment constraints.
+ */
+ if (align < EFI_ALLOC_ALIGN)
+ align = EFI_ALLOC_ALIGN;
+
+ size = round_up(size, EFI_ALLOC_ALIGN);
+ nr_pages = size / EFI_PAGE_SIZE;
+ for (i = 0; i < map_size / desc_size; i++) {
+ efi_memory_desc_t *desc;
+ unsigned long m = (unsigned long)map;
+ u64 start, end;
+
+ desc = efi_early_memdesc_ptr(m, desc_size, i);
+
+ if (desc->type != EFI_CONVENTIONAL_MEMORY)
+ continue;
+
+ if (efi_soft_reserve_enabled() &&
+ (desc->attribute & EFI_MEMORY_SP))
+ continue;
+
+ if (desc->num_pages < nr_pages)
+ continue;
+
+ start = desc->phys_addr;
+ end = start + desc->num_pages * EFI_PAGE_SIZE;
+
+ if (start < min)
+ start = min;
+
+ start = round_up(start, align);
+ if ((start + size) > end)
+ continue;
+
+ status = efi_bs_call(allocate_pages, EFI_ALLOCATE_ADDRESS,
+ EFI_LOADER_DATA, nr_pages, &start);
+ if (status == EFI_SUCCESS) {
+ *addr = start;
+ break;
+ }
+ }
+
+ if (i == map_size / desc_size)
+ status = EFI_NOT_FOUND;
+
+ efi_bs_call(free_pool, map);
+fail:
+ return status;
+}
+
+/**
+ * efi_relocate_kernel() - copy memory area
+ * @image_addr: pointer to address of memory area to copy
+ * @image_size: size of memory area to copy
+ * @alloc_size: minimum size of memory to allocate, must be greater or
+ * equal to image_size
+ * @preferred_addr: preferred target address
+ * @alignment: minimum alignment of the allocated memory area. It
+ * should be a power of two.
+ * @min_addr: minimum target address
+ *
+ * Copy a memory area to a newly allocated memory area aligned according
+ * to @alignment but at least EFI_ALLOC_ALIGN. If the preferred address
+ * is not available, the allocated address will not be below @min_addr.
+ * On exit, @image_addr is updated to the target copy address that was used.
+ *
+ * This function is used to copy the Linux kernel verbatim. It does not apply
+ * any relocation changes.
+ *
+ * Return: status code
+ */
+efi_status_t efi_relocate_kernel(unsigned long *image_addr,
+ unsigned long image_size,
+ unsigned long alloc_size,
+ unsigned long preferred_addr,
+ unsigned long alignment,
+ unsigned long min_addr)
+{
+ unsigned long cur_image_addr;
+ unsigned long new_addr = 0;
+ efi_status_t status;
+ unsigned long nr_pages;
+ efi_physical_addr_t efi_addr = preferred_addr;
+
+ if (!image_addr || !image_size || !alloc_size)
+ return EFI_INVALID_PARAMETER;
+ if (alloc_size < image_size)
+ return EFI_INVALID_PARAMETER;
+
+ cur_image_addr = *image_addr;
+
+ /*
+ * The EFI firmware loader could have placed the kernel image
+ * anywhere in memory, but the kernel has restrictions on the
+ * max physical address it can run at. Some architectures
+ * also have a preferred address, so first try to relocate
+ * to the preferred address. If that fails, allocate as low
+ * as possible while respecting the required alignment.
+ */
+ nr_pages = round_up(alloc_size, EFI_ALLOC_ALIGN) / EFI_PAGE_SIZE;
+ status = efi_bs_call(allocate_pages, EFI_ALLOCATE_ADDRESS,
+ EFI_LOADER_DATA, nr_pages, &efi_addr);
+ new_addr = efi_addr;
+ /*
+ * If preferred address allocation failed allocate as low as
+ * possible.
+ */
+ if (status != EFI_SUCCESS) {
+ status = efi_low_alloc_above(alloc_size, alignment, &new_addr,
+ min_addr);
+ }
+ if (status != EFI_SUCCESS) {
+ efi_err("Failed to allocate usable memory for kernel.\n");
+ return status;
+ }
+
+ /*
+ * We know source/dest won't overlap since both memory ranges
+ * have been allocated by UEFI, so we can safely use memcpy.
+ */
+ memcpy((void *)new_addr, (void *)cur_image_addr, image_size);
+
+ /* Return the new address of the relocated image. */
+ *image_addr = new_addr;
+
+ return status;
+}
diff --git a/drivers/firmware/efi/libstub/riscv-stub.c b/drivers/firmware/efi/libstub/riscv-stub.c
new file mode 100644
index 0000000..9c46084
--- /dev/null
+++ b/drivers/firmware/efi/libstub/riscv-stub.c
@@ -0,0 +1,112 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2020 Western Digital Corporation or its affiliates.
+ */
+
+#include <linux/efi.h>
+#include <linux/libfdt.h>
+
+#include <asm/efi.h>
+#include <asm/sections.h>
+
+#include "efistub.h"
+
+/*
+ * RISC-V requires the kernel image to placed 2 MB aligned base for 64 bit and
+ * 4MB for 32 bit.
+ */
+#ifdef CONFIG_64BIT
+#define MIN_KIMG_ALIGN SZ_2M
+#else
+#define MIN_KIMG_ALIGN SZ_4M
+#endif
+
+typedef void __noreturn (*jump_kernel_func)(unsigned int, unsigned long);
+
+static u32 hartid;
+
+static int get_boot_hartid_from_fdt(void)
+{
+ const void *fdt;
+ int chosen_node, len;
+ const fdt32_t *prop;
+
+ fdt = get_efi_config_table(DEVICE_TREE_GUID);
+ if (!fdt)
+ return -EINVAL;
+
+ chosen_node = fdt_path_offset(fdt, "/chosen");
+ if (chosen_node < 0)
+ return -EINVAL;
+
+ prop = fdt_getprop((void *)fdt, chosen_node, "boot-hartid", &len);
+ if (!prop || len != sizeof(u32))
+ return -EINVAL;
+
+ hartid = fdt32_to_cpu(*prop);
+ return 0;
+}
+
+efi_status_t check_platform_features(void)
+{
+ int ret;
+
+ ret = get_boot_hartid_from_fdt();
+ if (ret) {
+ efi_err("/chosen/boot-hartid missing or invalid!\n");
+ return EFI_UNSUPPORTED;
+ }
+ return EFI_SUCCESS;
+}
+
+void __noreturn efi_enter_kernel(unsigned long entrypoint, unsigned long fdt,
+ unsigned long fdt_size)
+{
+ unsigned long stext_offset = _start_kernel - _start;
+ unsigned long kernel_entry = entrypoint + stext_offset;
+ jump_kernel_func jump_kernel = (jump_kernel_func)kernel_entry;
+
+ /*
+ * Jump to real kernel here with following constraints.
+ * 1. MMU should be disabled.
+ * 2. a0 should contain hartid
+ * 3. a1 should DT address
+ */
+ csr_write(CSR_SATP, 0);
+ jump_kernel(hartid, fdt);
+}
+
+efi_status_t handle_kernel_image(unsigned long *image_addr,
+ unsigned long *image_size,
+ unsigned long *reserve_addr,
+ unsigned long *reserve_size,
+ efi_loaded_image_t *image)
+{
+ unsigned long kernel_size = 0;
+ unsigned long preferred_addr;
+ efi_status_t status;
+
+ kernel_size = _edata - _start;
+ *image_addr = (unsigned long)_start;
+ *image_size = kernel_size + (_end - _edata);
+
+ /*
+ * RISC-V kernel maps PAGE_OFFSET virtual address to the same physical
+ * address where kernel is booted. That's why kernel should boot from
+ * as low as possible to avoid wastage of memory. Currently, dram_base
+ * is occupied by the firmware. So the preferred address for kernel to
+ * boot is next aligned address. If preferred address is not available,
+ * relocate_kernel will fall back to efi_low_alloc_above to allocate
+ * lowest possible memory region as long as the address and size meets
+ * the alignment constraints.
+ */
+ preferred_addr = MIN_KIMG_ALIGN;
+ status = efi_relocate_kernel(image_addr, kernel_size, *image_size,
+ preferred_addr, MIN_KIMG_ALIGN, 0x0);
+
+ if (status != EFI_SUCCESS) {
+ efi_err("Failed to relocate kernel\n");
+ *image_size = 0;
+ }
+ return status;
+}
diff --git a/drivers/firmware/efi/libstub/secureboot.c b/drivers/firmware/efi/libstub/secureboot.c
index edba5e7..5efc524 100644
--- a/drivers/firmware/efi/libstub/secureboot.c
+++ b/drivers/firmware/efi/libstub/secureboot.c
@@ -21,18 +21,13 @@
static const efi_guid_t shim_guid = EFI_SHIM_LOCK_GUID;
static const efi_char16_t shim_MokSBState_name[] = L"MokSBState";
-#define get_efi_var(name, vendor, ...) \
- efi_call_runtime(get_variable, \
- (efi_char16_t *)(name), (efi_guid_t *)(vendor), \
- __VA_ARGS__);
-
/*
* Determine whether we're in secure boot mode.
*
* Please keep the logic in sync with
* arch/x86/xen/efi.c:xen_efi_get_secureboot().
*/
-enum efi_secureboot_mode efi_get_secureboot(efi_system_table_t *sys_table_arg)
+enum efi_secureboot_mode efi_get_secureboot(void)
{
u32 attr;
u8 secboot, setupmode, moksbstate;
@@ -72,10 +67,10 @@
return efi_secureboot_mode_disabled;
secure_boot_enabled:
- pr_efi(sys_table_arg, "UEFI Secure Boot is enabled.\n");
+ efi_info("UEFI Secure Boot is enabled.\n");
return efi_secureboot_mode_enabled;
out_efi_err:
- pr_efi_err(sys_table_arg, "Could not determine UEFI Secure Boot status.\n");
+ efi_err("Could not determine UEFI Secure Boot status.\n");
return efi_secureboot_mode_unknown;
}
diff --git a/drivers/firmware/efi/libstub/skip_spaces.c b/drivers/firmware/efi/libstub/skip_spaces.c
new file mode 100644
index 0000000..159fb4e
--- /dev/null
+++ b/drivers/firmware/efi/libstub/skip_spaces.c
@@ -0,0 +1,12 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/ctype.h>
+#include <linux/string.h>
+#include <linux/types.h>
+
+char *skip_spaces(const char *str)
+{
+ while (isspace(*str))
+ ++str;
+ return (char *)str;
+}
diff --git a/drivers/firmware/efi/libstub/string.c b/drivers/firmware/efi/libstub/string.c
index ed10e3f..5d13e43 100644
--- a/drivers/firmware/efi/libstub/string.c
+++ b/drivers/firmware/efi/libstub/string.c
@@ -6,6 +6,8 @@
* Copyright (C) 1991, 1992 Linus Torvalds
*/
+#include <linux/ctype.h>
+#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/string.h>
@@ -56,3 +58,58 @@
return 0;
}
#endif
+
+/* Works only for digits and letters, but small and fast */
+#define TOLOWER(x) ((x) | 0x20)
+
+static unsigned int simple_guess_base(const char *cp)
+{
+ if (cp[0] == '0') {
+ if (TOLOWER(cp[1]) == 'x' && isxdigit(cp[2]))
+ return 16;
+ else
+ return 8;
+ } else {
+ return 10;
+ }
+}
+
+/**
+ * simple_strtoull - convert a string to an unsigned long long
+ * @cp: The start of the string
+ * @endp: A pointer to the end of the parsed string will be placed here
+ * @base: The number base to use
+ */
+
+unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base)
+{
+ unsigned long long result = 0;
+
+ if (!base)
+ base = simple_guess_base(cp);
+
+ if (base == 16 && cp[0] == '0' && TOLOWER(cp[1]) == 'x')
+ cp += 2;
+
+ while (isxdigit(*cp)) {
+ unsigned int value;
+
+ value = isdigit(*cp) ? *cp - '0' : TOLOWER(*cp) - 'a' + 10;
+ if (value >= base)
+ break;
+ result = result * base + value;
+ cp++;
+ }
+ if (endp)
+ *endp = (char *)cp;
+
+ return result;
+}
+
+long simple_strtol(const char *cp, char **endp, unsigned int base)
+{
+ if (*cp == '-')
+ return -simple_strtoull(cp + 1, endp, base);
+
+ return simple_strtoull(cp, endp, base);
+}
diff --git a/drivers/firmware/efi/libstub/tpm.c b/drivers/firmware/efi/libstub/tpm.c
index aeeb1b2..7acbac1 100644
--- a/drivers/firmware/efi/libstub/tpm.c
+++ b/drivers/firmware/efi/libstub/tpm.c
@@ -20,23 +20,13 @@
#define MEMORY_ONLY_RESET_CONTROL_GUID \
EFI_GUID(0xe20939be, 0x32d4, 0x41be, 0xa1, 0x50, 0x89, 0x7f, 0x85, 0xd4, 0x98, 0x29)
-#define get_efi_var(name, vendor, ...) \
- efi_call_runtime(get_variable, \
- (efi_char16_t *)(name), (efi_guid_t *)(vendor), \
- __VA_ARGS__)
-
-#define set_efi_var(name, vendor, ...) \
- efi_call_runtime(set_variable, \
- (efi_char16_t *)(name), (efi_guid_t *)(vendor), \
- __VA_ARGS__)
-
/*
* Enable reboot attack mitigation. This requests that the firmware clear the
* RAM on next reboot before proceeding with boot, ensuring that any secrets
* are cleared. If userland has ensured that all secrets have been removed
* from RAM before reboot it can simply reset this variable.
*/
-void efi_enable_reset_attack_mitigation(efi_system_table_t *sys_table_arg)
+void efi_enable_reset_attack_mitigation(void)
{
u8 val = 1;
efi_guid_t var_guid = MEMORY_ONLY_RESET_CONTROL_GUID;
@@ -57,7 +47,7 @@
#endif
-void efi_retrieve_tpm2_eventlog(efi_system_table_t *sys_table_arg)
+void efi_retrieve_tpm2_eventlog(void)
{
efi_guid_t tcg2_guid = EFI_TCG2_PROTOCOL_GUID;
efi_guid_t linux_eventlog_guid = LINUX_EFI_TPM_EVENT_LOG_GUID;
@@ -69,23 +59,22 @@
size_t log_size, last_entry_size;
efi_bool_t truncated;
int version = EFI_TCG2_EVENT_LOG_FORMAT_TCG_2;
- void *tcg2_protocol = NULL;
+ efi_tcg2_protocol_t *tcg2_protocol = NULL;
int final_events_size = 0;
- status = efi_call_early(locate_protocol, &tcg2_guid, NULL,
- &tcg2_protocol);
+ status = efi_bs_call(locate_protocol, &tcg2_guid, NULL,
+ (void **)&tcg2_protocol);
if (status != EFI_SUCCESS)
return;
- status = efi_call_proto(efi_tcg2_protocol, get_event_log,
- tcg2_protocol, version, &log_location,
- &log_last_entry, &truncated);
+ status = efi_call_proto(tcg2_protocol, get_event_log, version,
+ &log_location, &log_last_entry, &truncated);
if (status != EFI_SUCCESS || !log_location) {
version = EFI_TCG2_EVENT_LOG_FORMAT_TCG_1_2;
- status = efi_call_proto(efi_tcg2_protocol, get_event_log,
- tcg2_protocol, version, &log_location,
- &log_last_entry, &truncated);
+ status = efi_call_proto(tcg2_protocol, get_event_log, version,
+ &log_location, &log_last_entry,
+ &truncated);
if (status != EFI_SUCCESS || !log_location)
return;
@@ -126,13 +115,11 @@
}
/* Allocate space for the logs and copy them. */
- status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
- sizeof(*log_tbl) + log_size,
- (void **) &log_tbl);
+ status = efi_bs_call(allocate_pool, EFI_LOADER_DATA,
+ sizeof(*log_tbl) + log_size, (void **)&log_tbl);
if (status != EFI_SUCCESS) {
- efi_printk(sys_table_arg,
- "Unable to allocate memory for event log\n");
+ efi_err("Unable to allocate memory for event log\n");
return;
}
@@ -141,8 +128,7 @@
* final events structure, and if so how much space they take up
*/
if (version == EFI_TCG2_EVENT_LOG_FORMAT_TCG_2)
- final_events_table = get_efi_config_table(sys_table_arg,
- LINUX_EFI_TPM_FINAL_LOG_GUID);
+ final_events_table = get_efi_config_table(LINUX_EFI_TPM_FINAL_LOG_GUID);
if (final_events_table && final_events_table->nr_events) {
struct tcg_pcr_event2_head *header;
int offset;
@@ -170,12 +156,12 @@
log_tbl->version = version;
memcpy(log_tbl->log, (void *) first_entry_addr, log_size);
- status = efi_call_early(install_configuration_table,
- &linux_eventlog_guid, log_tbl);
+ status = efi_bs_call(install_configuration_table,
+ &linux_eventlog_guid, log_tbl);
if (status != EFI_SUCCESS)
goto err_free;
return;
err_free:
- efi_call_early(free_pool, log_tbl);
+ efi_bs_call(free_pool, log_tbl);
}
diff --git a/drivers/firmware/efi/libstub/vsprintf.c b/drivers/firmware/efi/libstub/vsprintf.c
new file mode 100644
index 0000000..1088e28
--- /dev/null
+++ b/drivers/firmware/efi/libstub/vsprintf.c
@@ -0,0 +1,564 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* -*- linux-c -*- ------------------------------------------------------- *
+ *
+ * Copyright (C) 1991, 1992 Linus Torvalds
+ * Copyright 2007 rPath, Inc. - All Rights Reserved
+ *
+ * ----------------------------------------------------------------------- */
+
+/*
+ * Oh, it's a waste of space, but oh-so-yummy for debugging.
+ */
+
+#include <stdarg.h>
+
+#include <linux/compiler.h>
+#include <linux/ctype.h>
+#include <linux/kernel.h>
+#include <linux/limits.h>
+#include <linux/string.h>
+#include <linux/types.h>
+
+static
+int skip_atoi(const char **s)
+{
+ int i = 0;
+
+ while (isdigit(**s))
+ i = i * 10 + *((*s)++) - '0';
+ return i;
+}
+
+/*
+ * put_dec_full4 handles numbers in the range 0 <= r < 10000.
+ * The multiplier 0xccd is round(2^15/10), and the approximation
+ * r/10 == (r * 0xccd) >> 15 is exact for all r < 16389.
+ */
+static
+void put_dec_full4(char *end, unsigned int r)
+{
+ int i;
+
+ for (i = 0; i < 3; i++) {
+ unsigned int q = (r * 0xccd) >> 15;
+ *--end = '0' + (r - q * 10);
+ r = q;
+ }
+ *--end = '0' + r;
+}
+
+/* put_dec is copied from lib/vsprintf.c with small modifications */
+
+/*
+ * Call put_dec_full4 on x % 10000, return x / 10000.
+ * The approximation x/10000 == (x * 0x346DC5D7) >> 43
+ * holds for all x < 1,128,869,999. The largest value this
+ * helper will ever be asked to convert is 1,125,520,955.
+ * (second call in the put_dec code, assuming n is all-ones).
+ */
+static
+unsigned int put_dec_helper4(char *end, unsigned int x)
+{
+ unsigned int q = (x * 0x346DC5D7ULL) >> 43;
+
+ put_dec_full4(end, x - q * 10000);
+ return q;
+}
+
+/* Based on code by Douglas W. Jones found at
+ * <http://www.cs.uiowa.edu/~jones/bcd/decimal.html#sixtyfour>
+ * (with permission from the author).
+ * Performs no 64-bit division and hence should be fast on 32-bit machines.
+ */
+static
+char *put_dec(char *end, unsigned long long n)
+{
+ unsigned int d3, d2, d1, q, h;
+ char *p = end;
+
+ d1 = ((unsigned int)n >> 16); /* implicit "& 0xffff" */
+ h = (n >> 32);
+ d2 = (h ) & 0xffff;
+ d3 = (h >> 16); /* implicit "& 0xffff" */
+
+ /* n = 2^48 d3 + 2^32 d2 + 2^16 d1 + d0
+ = 281_4749_7671_0656 d3 + 42_9496_7296 d2 + 6_5536 d1 + d0 */
+ q = 656 * d3 + 7296 * d2 + 5536 * d1 + ((unsigned int)n & 0xffff);
+ q = put_dec_helper4(p, q);
+ p -= 4;
+
+ q += 7671 * d3 + 9496 * d2 + 6 * d1;
+ q = put_dec_helper4(p, q);
+ p -= 4;
+
+ q += 4749 * d3 + 42 * d2;
+ q = put_dec_helper4(p, q);
+ p -= 4;
+
+ q += 281 * d3;
+ q = put_dec_helper4(p, q);
+ p -= 4;
+
+ put_dec_full4(p, q);
+ p -= 4;
+
+ /* strip off the extra 0's we printed */
+ while (p < end && *p == '0')
+ ++p;
+
+ return p;
+}
+
+static
+char *number(char *end, unsigned long long num, int base, char locase)
+{
+ /*
+ * locase = 0 or 0x20. ORing digits or letters with 'locase'
+ * produces same digits or (maybe lowercased) letters
+ */
+
+ /* we are called with base 8, 10 or 16, only, thus don't need "G..." */
+ static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */
+
+ switch (base) {
+ case 10:
+ if (num != 0)
+ end = put_dec(end, num);
+ break;
+ case 8:
+ for (; num != 0; num >>= 3)
+ *--end = '0' + (num & 07);
+ break;
+ case 16:
+ for (; num != 0; num >>= 4)
+ *--end = digits[num & 0xf] | locase;
+ break;
+ default:
+ unreachable();
+ }
+
+ return end;
+}
+
+#define ZEROPAD 1 /* pad with zero */
+#define SIGN 2 /* unsigned/signed long */
+#define PLUS 4 /* show plus */
+#define SPACE 8 /* space if plus */
+#define LEFT 16 /* left justified */
+#define SMALL 32 /* Must be 32 == 0x20 */
+#define SPECIAL 64 /* 0x */
+#define WIDE 128 /* UTF-16 string */
+
+static
+int get_flags(const char **fmt)
+{
+ int flags = 0;
+
+ do {
+ switch (**fmt) {
+ case '-':
+ flags |= LEFT;
+ break;
+ case '+':
+ flags |= PLUS;
+ break;
+ case ' ':
+ flags |= SPACE;
+ break;
+ case '#':
+ flags |= SPECIAL;
+ break;
+ case '0':
+ flags |= ZEROPAD;
+ break;
+ default:
+ return flags;
+ }
+ ++(*fmt);
+ } while (1);
+}
+
+static
+int get_int(const char **fmt, va_list *ap)
+{
+ if (isdigit(**fmt))
+ return skip_atoi(fmt);
+ if (**fmt == '*') {
+ ++(*fmt);
+ /* it's the next argument */
+ return va_arg(*ap, int);
+ }
+ return 0;
+}
+
+static
+unsigned long long get_number(int sign, int qualifier, va_list *ap)
+{
+ if (sign) {
+ switch (qualifier) {
+ case 'L':
+ return va_arg(*ap, long long);
+ case 'l':
+ return va_arg(*ap, long);
+ case 'h':
+ return (short)va_arg(*ap, int);
+ case 'H':
+ return (signed char)va_arg(*ap, int);
+ default:
+ return va_arg(*ap, int);
+ };
+ } else {
+ switch (qualifier) {
+ case 'L':
+ return va_arg(*ap, unsigned long long);
+ case 'l':
+ return va_arg(*ap, unsigned long);
+ case 'h':
+ return (unsigned short)va_arg(*ap, int);
+ case 'H':
+ return (unsigned char)va_arg(*ap, int);
+ default:
+ return va_arg(*ap, unsigned int);
+ }
+ }
+}
+
+static
+char get_sign(long long *num, int flags)
+{
+ if (!(flags & SIGN))
+ return 0;
+ if (*num < 0) {
+ *num = -(*num);
+ return '-';
+ }
+ if (flags & PLUS)
+ return '+';
+ if (flags & SPACE)
+ return ' ';
+ return 0;
+}
+
+static
+size_t utf16s_utf8nlen(const u16 *s16, size_t maxlen)
+{
+ size_t len, clen;
+
+ for (len = 0; len < maxlen && *s16; len += clen) {
+ u16 c0 = *s16++;
+
+ /* First, get the length for a BMP character */
+ clen = 1 + (c0 >= 0x80) + (c0 >= 0x800);
+ if (len + clen > maxlen)
+ break;
+ /*
+ * If this is a high surrogate, and we're already at maxlen, we
+ * can't include the character if it's a valid surrogate pair.
+ * Avoid accessing one extra word just to check if it's valid
+ * or not.
+ */
+ if ((c0 & 0xfc00) == 0xd800) {
+ if (len + clen == maxlen)
+ break;
+ if ((*s16 & 0xfc00) == 0xdc00) {
+ ++s16;
+ ++clen;
+ }
+ }
+ }
+
+ return len;
+}
+
+static
+u32 utf16_to_utf32(const u16 **s16)
+{
+ u16 c0, c1;
+
+ c0 = *(*s16)++;
+ /* not a surrogate */
+ if ((c0 & 0xf800) != 0xd800)
+ return c0;
+ /* invalid: low surrogate instead of high */
+ if (c0 & 0x0400)
+ return 0xfffd;
+ c1 = **s16;
+ /* invalid: missing low surrogate */
+ if ((c1 & 0xfc00) != 0xdc00)
+ return 0xfffd;
+ /* valid surrogate pair */
+ ++(*s16);
+ return (0x10000 - (0xd800 << 10) - 0xdc00) + (c0 << 10) + c1;
+}
+
+#define PUTC(c) \
+do { \
+ if (pos < size) \
+ buf[pos] = (c); \
+ ++pos; \
+} while (0);
+
+int vsnprintf(char *buf, size_t size, const char *fmt, va_list ap)
+{
+ /* The maximum space required is to print a 64-bit number in octal */
+ char tmp[(sizeof(unsigned long long) * 8 + 2) / 3];
+ char *tmp_end = &tmp[ARRAY_SIZE(tmp)];
+ long long num;
+ int base;
+ const char *s;
+ size_t len, pos;
+ char sign;
+
+ int flags; /* flags to number() */
+
+ int field_width; /* width of output field */
+ int precision; /* min. # of digits for integers; max
+ number of chars for from string */
+ int qualifier; /* 'h', 'hh', 'l' or 'll' for integer fields */
+
+ va_list args;
+
+ /*
+ * We want to pass our input va_list to helper functions by reference,
+ * but there's an annoying edge case. If va_list was originally passed
+ * to us by value, we could just pass &ap down to the helpers. This is
+ * the case on, for example, X86_32.
+ * However, on X86_64 (and possibly others), va_list is actually a
+ * size-1 array containing a structure. Our function parameter ap has
+ * decayed from T[1] to T*, and &ap has type T** rather than T(*)[1],
+ * which is what will be expected by a function taking a va_list *
+ * parameter.
+ * One standard way to solve this mess is by creating a copy in a local
+ * variable of type va_list and then passing a pointer to that local
+ * copy instead, which is what we do here.
+ */
+ va_copy(args, ap);
+
+ for (pos = 0; *fmt; ++fmt) {
+ if (*fmt != '%' || *++fmt == '%') {
+ PUTC(*fmt);
+ continue;
+ }
+
+ /* process flags */
+ flags = get_flags(&fmt);
+
+ /* get field width */
+ field_width = get_int(&fmt, &args);
+ if (field_width < 0) {
+ field_width = -field_width;
+ flags |= LEFT;
+ }
+
+ if (flags & LEFT)
+ flags &= ~ZEROPAD;
+
+ /* get the precision */
+ precision = -1;
+ if (*fmt == '.') {
+ ++fmt;
+ precision = get_int(&fmt, &args);
+ if (precision >= 0)
+ flags &= ~ZEROPAD;
+ }
+
+ /* get the conversion qualifier */
+ qualifier = -1;
+ if (*fmt == 'h' || *fmt == 'l') {
+ qualifier = *fmt;
+ ++fmt;
+ if (qualifier == *fmt) {
+ qualifier -= 'a'-'A';
+ ++fmt;
+ }
+ }
+
+ sign = 0;
+
+ switch (*fmt) {
+ case 'c':
+ flags &= LEFT;
+ s = tmp;
+ if (qualifier == 'l') {
+ ((u16 *)tmp)[0] = (u16)va_arg(args, unsigned int);
+ ((u16 *)tmp)[1] = L'\0';
+ precision = INT_MAX;
+ goto wstring;
+ } else {
+ tmp[0] = (unsigned char)va_arg(args, int);
+ precision = len = 1;
+ }
+ goto output;
+
+ case 's':
+ flags &= LEFT;
+ if (precision < 0)
+ precision = INT_MAX;
+ s = va_arg(args, void *);
+ if (!s)
+ s = precision < 6 ? "" : "(null)";
+ else if (qualifier == 'l') {
+ wstring:
+ flags |= WIDE;
+ precision = len = utf16s_utf8nlen((const u16 *)s, precision);
+ goto output;
+ }
+ precision = len = strnlen(s, precision);
+ goto output;
+
+ /* integer number formats - set up the flags and "break" */
+ case 'o':
+ base = 8;
+ break;
+
+ case 'p':
+ if (precision < 0)
+ precision = 2 * sizeof(void *);
+ fallthrough;
+ case 'x':
+ flags |= SMALL;
+ fallthrough;
+ case 'X':
+ base = 16;
+ break;
+
+ case 'd':
+ case 'i':
+ flags |= SIGN;
+ fallthrough;
+ case 'u':
+ flags &= ~SPECIAL;
+ base = 10;
+ break;
+
+ default:
+ /*
+ * Bail out if the conversion specifier is invalid.
+ * There's probably a typo in the format string and the
+ * remaining specifiers are unlikely to match up with
+ * the arguments.
+ */
+ goto fail;
+ }
+ if (*fmt == 'p') {
+ num = (unsigned long)va_arg(args, void *);
+ } else {
+ num = get_number(flags & SIGN, qualifier, &args);
+ }
+
+ sign = get_sign(&num, flags);
+ if (sign)
+ --field_width;
+
+ s = number(tmp_end, num, base, flags & SMALL);
+ len = tmp_end - s;
+ /* default precision is 1 */
+ if (precision < 0)
+ precision = 1;
+ /* precision is minimum number of digits to print */
+ if (precision < len)
+ precision = len;
+ if (flags & SPECIAL) {
+ /*
+ * For octal, a leading 0 is printed only if necessary,
+ * i.e. if it's not already there because of the
+ * precision.
+ */
+ if (base == 8 && precision == len)
+ ++precision;
+ /*
+ * For hexadecimal, the leading 0x is skipped if the
+ * output is empty, i.e. both the number and the
+ * precision are 0.
+ */
+ if (base == 16 && precision > 0)
+ field_width -= 2;
+ else
+ flags &= ~SPECIAL;
+ }
+ /*
+ * For zero padding, increase the precision to fill the field
+ * width.
+ */
+ if ((flags & ZEROPAD) && field_width > precision)
+ precision = field_width;
+
+output:
+ /* Calculate the padding necessary */
+ field_width -= precision;
+ /* Leading padding with ' ' */
+ if (!(flags & LEFT))
+ while (field_width-- > 0)
+ PUTC(' ');
+ /* sign */
+ if (sign)
+ PUTC(sign);
+ /* 0x/0X for hexadecimal */
+ if (flags & SPECIAL) {
+ PUTC('0');
+ PUTC( 'X' | (flags & SMALL));
+ }
+ /* Zero padding and excess precision */
+ while (precision-- > len)
+ PUTC('0');
+ /* Actual output */
+ if (flags & WIDE) {
+ const u16 *ws = (const u16 *)s;
+
+ while (len-- > 0) {
+ u32 c32 = utf16_to_utf32(&ws);
+ u8 *s8;
+ size_t clen;
+
+ if (c32 < 0x80) {
+ PUTC(c32);
+ continue;
+ }
+
+ /* Number of trailing octets */
+ clen = 1 + (c32 >= 0x800) + (c32 >= 0x10000);
+
+ len -= clen;
+ s8 = (u8 *)&buf[pos];
+
+ /* Avoid writing partial character */
+ PUTC('\0');
+ pos += clen;
+ if (pos >= size)
+ continue;
+
+ /* Set high bits of leading octet */
+ *s8 = (0xf00 >> 1) >> clen;
+ /* Write trailing octets in reverse order */
+ for (s8 += clen; clen; --clen, c32 >>= 6)
+ *s8-- = 0x80 | (c32 & 0x3f);
+ /* Set low bits of leading octet */
+ *s8 |= c32;
+ }
+ } else {
+ while (len-- > 0)
+ PUTC(*s++);
+ }
+ /* Trailing padding with ' ' */
+ while (field_width-- > 0)
+ PUTC(' ');
+ }
+fail:
+ va_end(args);
+
+ if (size)
+ buf[min(pos, size-1)] = '\0';
+
+ return pos;
+}
+
+int snprintf(char *buf, size_t size, const char *fmt, ...)
+{
+ va_list args;
+ int i;
+
+ va_start(args, fmt);
+ i = vsnprintf(buf, size, fmt, args);
+ va_end(args);
+ return i;
+}
diff --git a/drivers/firmware/efi/libstub/x86-stub.c b/drivers/firmware/efi/libstub/x86-stub.c
new file mode 100644
index 0000000..3672539
--- /dev/null
+++ b/drivers/firmware/efi/libstub/x86-stub.c
@@ -0,0 +1,810 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+/* -----------------------------------------------------------------------
+ *
+ * Copyright 2011 Intel Corporation; author Matt Fleming
+ *
+ * ----------------------------------------------------------------------- */
+
+#include <linux/efi.h>
+#include <linux/pci.h>
+#include <linux/stddef.h>
+
+#include <asm/efi.h>
+#include <asm/e820/types.h>
+#include <asm/setup.h>
+#include <asm/desc.h>
+#include <asm/boot.h>
+
+#include "efistub.h"
+
+/* Maximum physical address for 64-bit kernel with 4-level paging */
+#define MAXMEM_X86_64_4LEVEL (1ull << 46)
+
+const efi_system_table_t *efi_system_table;
+extern u32 image_offset;
+static efi_loaded_image_t *image = NULL;
+
+static efi_status_t
+preserve_pci_rom_image(efi_pci_io_protocol_t *pci, struct pci_setup_rom **__rom)
+{
+ struct pci_setup_rom *rom = NULL;
+ efi_status_t status;
+ unsigned long size;
+ uint64_t romsize;
+ void *romimage;
+
+ /*
+ * Some firmware images contain EFI function pointers at the place where
+ * the romimage and romsize fields are supposed to be. Typically the EFI
+ * code is mapped at high addresses, translating to an unrealistically
+ * large romsize. The UEFI spec limits the size of option ROMs to 16
+ * MiB so we reject any ROMs over 16 MiB in size to catch this.
+ */
+ romimage = efi_table_attr(pci, romimage);
+ romsize = efi_table_attr(pci, romsize);
+ if (!romimage || !romsize || romsize > SZ_16M)
+ return EFI_INVALID_PARAMETER;
+
+ size = romsize + sizeof(*rom);
+
+ status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size,
+ (void **)&rom);
+ if (status != EFI_SUCCESS) {
+ efi_err("Failed to allocate memory for 'rom'\n");
+ return status;
+ }
+
+ memset(rom, 0, sizeof(*rom));
+
+ rom->data.type = SETUP_PCI;
+ rom->data.len = size - sizeof(struct setup_data);
+ rom->data.next = 0;
+ rom->pcilen = pci->romsize;
+ *__rom = rom;
+
+ status = efi_call_proto(pci, pci.read, EfiPciIoWidthUint16,
+ PCI_VENDOR_ID, 1, &rom->vendor);
+
+ if (status != EFI_SUCCESS) {
+ efi_err("Failed to read rom->vendor\n");
+ goto free_struct;
+ }
+
+ status = efi_call_proto(pci, pci.read, EfiPciIoWidthUint16,
+ PCI_DEVICE_ID, 1, &rom->devid);
+
+ if (status != EFI_SUCCESS) {
+ efi_err("Failed to read rom->devid\n");
+ goto free_struct;
+ }
+
+ status = efi_call_proto(pci, get_location, &rom->segment, &rom->bus,
+ &rom->device, &rom->function);
+
+ if (status != EFI_SUCCESS)
+ goto free_struct;
+
+ memcpy(rom->romdata, romimage, romsize);
+ return status;
+
+free_struct:
+ efi_bs_call(free_pool, rom);
+ return status;
+}
+
+/*
+ * There's no way to return an informative status from this function,
+ * because any analysis (and printing of error messages) needs to be
+ * done directly at the EFI function call-site.
+ *
+ * For example, EFI_INVALID_PARAMETER could indicate a bug or maybe we
+ * just didn't find any PCI devices, but there's no way to tell outside
+ * the context of the call.
+ */
+static void setup_efi_pci(struct boot_params *params)
+{
+ efi_status_t status;
+ void **pci_handle = NULL;
+ efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID;
+ unsigned long size = 0;
+ struct setup_data *data;
+ efi_handle_t h;
+ int i;
+
+ status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL,
+ &pci_proto, NULL, &size, pci_handle);
+
+ if (status == EFI_BUFFER_TOO_SMALL) {
+ status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size,
+ (void **)&pci_handle);
+
+ if (status != EFI_SUCCESS) {
+ efi_err("Failed to allocate memory for 'pci_handle'\n");
+ return;
+ }
+
+ status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL,
+ &pci_proto, NULL, &size, pci_handle);
+ }
+
+ if (status != EFI_SUCCESS)
+ goto free_handle;
+
+ data = (struct setup_data *)(unsigned long)params->hdr.setup_data;
+
+ while (data && data->next)
+ data = (struct setup_data *)(unsigned long)data->next;
+
+ for_each_efi_handle(h, pci_handle, size, i) {
+ efi_pci_io_protocol_t *pci = NULL;
+ struct pci_setup_rom *rom;
+
+ status = efi_bs_call(handle_protocol, h, &pci_proto,
+ (void **)&pci);
+ if (status != EFI_SUCCESS || !pci)
+ continue;
+
+ status = preserve_pci_rom_image(pci, &rom);
+ if (status != EFI_SUCCESS)
+ continue;
+
+ if (data)
+ data->next = (unsigned long)rom;
+ else
+ params->hdr.setup_data = (unsigned long)rom;
+
+ data = (struct setup_data *)rom;
+ }
+
+free_handle:
+ efi_bs_call(free_pool, pci_handle);
+}
+
+static void retrieve_apple_device_properties(struct boot_params *boot_params)
+{
+ efi_guid_t guid = APPLE_PROPERTIES_PROTOCOL_GUID;
+ struct setup_data *data, *new;
+ efi_status_t status;
+ u32 size = 0;
+ apple_properties_protocol_t *p;
+
+ status = efi_bs_call(locate_protocol, &guid, NULL, (void **)&p);
+ if (status != EFI_SUCCESS)
+ return;
+
+ if (efi_table_attr(p, version) != 0x10000) {
+ efi_err("Unsupported properties proto version\n");
+ return;
+ }
+
+ efi_call_proto(p, get_all, NULL, &size);
+ if (!size)
+ return;
+
+ do {
+ status = efi_bs_call(allocate_pool, EFI_LOADER_DATA,
+ size + sizeof(struct setup_data),
+ (void **)&new);
+ if (status != EFI_SUCCESS) {
+ efi_err("Failed to allocate memory for 'properties'\n");
+ return;
+ }
+
+ status = efi_call_proto(p, get_all, new->data, &size);
+
+ if (status == EFI_BUFFER_TOO_SMALL)
+ efi_bs_call(free_pool, new);
+ } while (status == EFI_BUFFER_TOO_SMALL);
+
+ new->type = SETUP_APPLE_PROPERTIES;
+ new->len = size;
+ new->next = 0;
+
+ data = (struct setup_data *)(unsigned long)boot_params->hdr.setup_data;
+ if (!data) {
+ boot_params->hdr.setup_data = (unsigned long)new;
+ } else {
+ while (data->next)
+ data = (struct setup_data *)(unsigned long)data->next;
+ data->next = (unsigned long)new;
+ }
+}
+
+static const efi_char16_t apple[] = L"Apple";
+
+static void setup_quirks(struct boot_params *boot_params)
+{
+ efi_char16_t *fw_vendor = (efi_char16_t *)(unsigned long)
+ efi_table_attr(efi_system_table, fw_vendor);
+
+ if (!memcmp(fw_vendor, apple, sizeof(apple))) {
+ if (IS_ENABLED(CONFIG_APPLE_PROPERTIES))
+ retrieve_apple_device_properties(boot_params);
+ }
+}
+
+/*
+ * See if we have Universal Graphics Adapter (UGA) protocol
+ */
+static efi_status_t
+setup_uga(struct screen_info *si, efi_guid_t *uga_proto, unsigned long size)
+{
+ efi_status_t status;
+ u32 width, height;
+ void **uga_handle = NULL;
+ efi_uga_draw_protocol_t *uga = NULL, *first_uga;
+ efi_handle_t handle;
+ int i;
+
+ status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size,
+ (void **)&uga_handle);
+ if (status != EFI_SUCCESS)
+ return status;
+
+ status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL,
+ uga_proto, NULL, &size, uga_handle);
+ if (status != EFI_SUCCESS)
+ goto free_handle;
+
+ height = 0;
+ width = 0;
+
+ first_uga = NULL;
+ for_each_efi_handle(handle, uga_handle, size, i) {
+ efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID;
+ u32 w, h, depth, refresh;
+ void *pciio;
+
+ status = efi_bs_call(handle_protocol, handle, uga_proto,
+ (void **)&uga);
+ if (status != EFI_SUCCESS)
+ continue;
+
+ pciio = NULL;
+ efi_bs_call(handle_protocol, handle, &pciio_proto, &pciio);
+
+ status = efi_call_proto(uga, get_mode, &w, &h, &depth, &refresh);
+ if (status == EFI_SUCCESS && (!first_uga || pciio)) {
+ width = w;
+ height = h;
+
+ /*
+ * Once we've found a UGA supporting PCIIO,
+ * don't bother looking any further.
+ */
+ if (pciio)
+ break;
+
+ first_uga = uga;
+ }
+ }
+
+ if (!width && !height)
+ goto free_handle;
+
+ /* EFI framebuffer */
+ si->orig_video_isVGA = VIDEO_TYPE_EFI;
+
+ si->lfb_depth = 32;
+ si->lfb_width = width;
+ si->lfb_height = height;
+
+ si->red_size = 8;
+ si->red_pos = 16;
+ si->green_size = 8;
+ si->green_pos = 8;
+ si->blue_size = 8;
+ si->blue_pos = 0;
+ si->rsvd_size = 8;
+ si->rsvd_pos = 24;
+
+free_handle:
+ efi_bs_call(free_pool, uga_handle);
+
+ return status;
+}
+
+static void setup_graphics(struct boot_params *boot_params)
+{
+ efi_guid_t graphics_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
+ struct screen_info *si;
+ efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID;
+ efi_status_t status;
+ unsigned long size;
+ void **gop_handle = NULL;
+ void **uga_handle = NULL;
+
+ si = &boot_params->screen_info;
+ memset(si, 0, sizeof(*si));
+
+ size = 0;
+ status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL,
+ &graphics_proto, NULL, &size, gop_handle);
+ if (status == EFI_BUFFER_TOO_SMALL)
+ status = efi_setup_gop(si, &graphics_proto, size);
+
+ if (status != EFI_SUCCESS) {
+ size = 0;
+ status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL,
+ &uga_proto, NULL, &size, uga_handle);
+ if (status == EFI_BUFFER_TOO_SMALL)
+ setup_uga(si, &uga_proto, size);
+ }
+}
+
+
+static void __noreturn efi_exit(efi_handle_t handle, efi_status_t status)
+{
+ efi_bs_call(exit, handle, status, 0, NULL);
+ for(;;)
+ asm("hlt");
+}
+
+void startup_32(struct boot_params *boot_params);
+
+void __noreturn efi_stub_entry(efi_handle_t handle,
+ efi_system_table_t *sys_table_arg,
+ struct boot_params *boot_params);
+
+/*
+ * Because the x86 boot code expects to be passed a boot_params we
+ * need to create one ourselves (usually the bootloader would create
+ * one for us).
+ */
+efi_status_t __efiapi efi_pe_entry(efi_handle_t handle,
+ efi_system_table_t *sys_table_arg)
+{
+ struct boot_params *boot_params;
+ struct setup_header *hdr;
+ void *image_base;
+ efi_guid_t proto = LOADED_IMAGE_PROTOCOL_GUID;
+ int options_size = 0;
+ efi_status_t status;
+ char *cmdline_ptr;
+
+ efi_system_table = sys_table_arg;
+
+ /* Check if we were booted by the EFI firmware */
+ if (efi_system_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
+ efi_exit(handle, EFI_INVALID_PARAMETER);
+
+ status = efi_bs_call(handle_protocol, handle, &proto, (void **)&image);
+ if (status != EFI_SUCCESS) {
+ efi_err("Failed to get handle for LOADED_IMAGE_PROTOCOL\n");
+ efi_exit(handle, status);
+ }
+
+ image_base = efi_table_attr(image, image_base);
+ image_offset = (void *)startup_32 - image_base;
+
+ status = efi_allocate_pages(sizeof(struct boot_params),
+ (unsigned long *)&boot_params, ULONG_MAX);
+ if (status != EFI_SUCCESS) {
+ efi_err("Failed to allocate lowmem for boot params\n");
+ efi_exit(handle, status);
+ }
+
+ memset(boot_params, 0x0, sizeof(struct boot_params));
+
+ hdr = &boot_params->hdr;
+
+ /* Copy the setup header from the second sector to boot_params */
+ memcpy(&hdr->jump, image_base + 512,
+ sizeof(struct setup_header) - offsetof(struct setup_header, jump));
+
+ /*
+ * Fill out some of the header fields ourselves because the
+ * EFI firmware loader doesn't load the first sector.
+ */
+ hdr->root_flags = 1;
+ hdr->vid_mode = 0xffff;
+ hdr->boot_flag = 0xAA55;
+
+ hdr->type_of_loader = 0x21;
+
+ /* Convert unicode cmdline to ascii */
+ cmdline_ptr = efi_convert_cmdline(image, &options_size);
+ if (!cmdline_ptr)
+ goto fail;
+
+ efi_set_u64_split((unsigned long)cmdline_ptr,
+ &hdr->cmd_line_ptr, &boot_params->ext_cmd_line_ptr);
+
+ hdr->ramdisk_image = 0;
+ hdr->ramdisk_size = 0;
+
+ efi_stub_entry(handle, sys_table_arg, boot_params);
+ /* not reached */
+
+fail:
+ efi_free(sizeof(struct boot_params), (unsigned long)boot_params);
+
+ efi_exit(handle, status);
+}
+
+static void add_e820ext(struct boot_params *params,
+ struct setup_data *e820ext, u32 nr_entries)
+{
+ struct setup_data *data;
+
+ e820ext->type = SETUP_E820_EXT;
+ e820ext->len = nr_entries * sizeof(struct boot_e820_entry);
+ e820ext->next = 0;
+
+ data = (struct setup_data *)(unsigned long)params->hdr.setup_data;
+
+ while (data && data->next)
+ data = (struct setup_data *)(unsigned long)data->next;
+
+ if (data)
+ data->next = (unsigned long)e820ext;
+ else
+ params->hdr.setup_data = (unsigned long)e820ext;
+}
+
+static efi_status_t
+setup_e820(struct boot_params *params, struct setup_data *e820ext, u32 e820ext_size)
+{
+ struct boot_e820_entry *entry = params->e820_table;
+ struct efi_info *efi = ¶ms->efi_info;
+ struct boot_e820_entry *prev = NULL;
+ u32 nr_entries;
+ u32 nr_desc;
+ int i;
+
+ nr_entries = 0;
+ nr_desc = efi->efi_memmap_size / efi->efi_memdesc_size;
+
+ for (i = 0; i < nr_desc; i++) {
+ efi_memory_desc_t *d;
+ unsigned int e820_type = 0;
+ unsigned long m = efi->efi_memmap;
+
+#ifdef CONFIG_X86_64
+ m |= (u64)efi->efi_memmap_hi << 32;
+#endif
+
+ d = efi_early_memdesc_ptr(m, efi->efi_memdesc_size, i);
+ switch (d->type) {
+ case EFI_RESERVED_TYPE:
+ case EFI_RUNTIME_SERVICES_CODE:
+ case EFI_RUNTIME_SERVICES_DATA:
+ case EFI_MEMORY_MAPPED_IO:
+ case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
+ case EFI_PAL_CODE:
+ e820_type = E820_TYPE_RESERVED;
+ break;
+
+ case EFI_UNUSABLE_MEMORY:
+ e820_type = E820_TYPE_UNUSABLE;
+ break;
+
+ case EFI_ACPI_RECLAIM_MEMORY:
+ e820_type = E820_TYPE_ACPI;
+ break;
+
+ case EFI_LOADER_CODE:
+ case EFI_LOADER_DATA:
+ case EFI_BOOT_SERVICES_CODE:
+ case EFI_BOOT_SERVICES_DATA:
+ case EFI_CONVENTIONAL_MEMORY:
+ if (efi_soft_reserve_enabled() &&
+ (d->attribute & EFI_MEMORY_SP))
+ e820_type = E820_TYPE_SOFT_RESERVED;
+ else
+ e820_type = E820_TYPE_RAM;
+ break;
+
+ case EFI_ACPI_MEMORY_NVS:
+ e820_type = E820_TYPE_NVS;
+ break;
+
+ case EFI_PERSISTENT_MEMORY:
+ e820_type = E820_TYPE_PMEM;
+ break;
+
+ default:
+ continue;
+ }
+
+ /* Merge adjacent mappings */
+ if (prev && prev->type == e820_type &&
+ (prev->addr + prev->size) == d->phys_addr) {
+ prev->size += d->num_pages << 12;
+ continue;
+ }
+
+ if (nr_entries == ARRAY_SIZE(params->e820_table)) {
+ u32 need = (nr_desc - i) * sizeof(struct e820_entry) +
+ sizeof(struct setup_data);
+
+ if (!e820ext || e820ext_size < need)
+ return EFI_BUFFER_TOO_SMALL;
+
+ /* boot_params map full, switch to e820 extended */
+ entry = (struct boot_e820_entry *)e820ext->data;
+ }
+
+ entry->addr = d->phys_addr;
+ entry->size = d->num_pages << PAGE_SHIFT;
+ entry->type = e820_type;
+ prev = entry++;
+ nr_entries++;
+ }
+
+ if (nr_entries > ARRAY_SIZE(params->e820_table)) {
+ u32 nr_e820ext = nr_entries - ARRAY_SIZE(params->e820_table);
+
+ add_e820ext(params, e820ext, nr_e820ext);
+ nr_entries -= nr_e820ext;
+ }
+
+ params->e820_entries = (u8)nr_entries;
+
+ return EFI_SUCCESS;
+}
+
+static efi_status_t alloc_e820ext(u32 nr_desc, struct setup_data **e820ext,
+ u32 *e820ext_size)
+{
+ efi_status_t status;
+ unsigned long size;
+
+ size = sizeof(struct setup_data) +
+ sizeof(struct e820_entry) * nr_desc;
+
+ if (*e820ext) {
+ efi_bs_call(free_pool, *e820ext);
+ *e820ext = NULL;
+ *e820ext_size = 0;
+ }
+
+ status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size,
+ (void **)e820ext);
+ if (status == EFI_SUCCESS)
+ *e820ext_size = size;
+
+ return status;
+}
+
+static efi_status_t allocate_e820(struct boot_params *params,
+ struct setup_data **e820ext,
+ u32 *e820ext_size)
+{
+ unsigned long map_size, desc_size, map_key;
+ efi_status_t status;
+ __u32 nr_desc, desc_version;
+
+ /* Only need the size of the mem map and size of each mem descriptor */
+ map_size = 0;
+ status = efi_bs_call(get_memory_map, &map_size, NULL, &map_key,
+ &desc_size, &desc_version);
+ if (status != EFI_BUFFER_TOO_SMALL)
+ return (status != EFI_SUCCESS) ? status : EFI_UNSUPPORTED;
+
+ nr_desc = map_size / desc_size + EFI_MMAP_NR_SLACK_SLOTS;
+
+ if (nr_desc > ARRAY_SIZE(params->e820_table)) {
+ u32 nr_e820ext = nr_desc - ARRAY_SIZE(params->e820_table);
+
+ status = alloc_e820ext(nr_e820ext, e820ext, e820ext_size);
+ if (status != EFI_SUCCESS)
+ return status;
+ }
+
+ return EFI_SUCCESS;
+}
+
+struct exit_boot_struct {
+ struct boot_params *boot_params;
+ struct efi_info *efi;
+};
+
+static efi_status_t exit_boot_func(struct efi_boot_memmap *map,
+ void *priv)
+{
+ const char *signature;
+ struct exit_boot_struct *p = priv;
+
+ signature = efi_is_64bit() ? EFI64_LOADER_SIGNATURE
+ : EFI32_LOADER_SIGNATURE;
+ memcpy(&p->efi->efi_loader_signature, signature, sizeof(__u32));
+
+ efi_set_u64_split((unsigned long)efi_system_table,
+ &p->efi->efi_systab, &p->efi->efi_systab_hi);
+ p->efi->efi_memdesc_size = *map->desc_size;
+ p->efi->efi_memdesc_version = *map->desc_ver;
+ efi_set_u64_split((unsigned long)*map->map,
+ &p->efi->efi_memmap, &p->efi->efi_memmap_hi);
+ p->efi->efi_memmap_size = *map->map_size;
+
+ return EFI_SUCCESS;
+}
+
+static efi_status_t exit_boot(struct boot_params *boot_params, void *handle)
+{
+ unsigned long map_sz, key, desc_size, buff_size;
+ efi_memory_desc_t *mem_map;
+ struct setup_data *e820ext = NULL;
+ __u32 e820ext_size = 0;
+ efi_status_t status;
+ __u32 desc_version;
+ struct efi_boot_memmap map;
+ struct exit_boot_struct priv;
+
+ map.map = &mem_map;
+ map.map_size = &map_sz;
+ map.desc_size = &desc_size;
+ map.desc_ver = &desc_version;
+ map.key_ptr = &key;
+ map.buff_size = &buff_size;
+ priv.boot_params = boot_params;
+ priv.efi = &boot_params->efi_info;
+
+ status = allocate_e820(boot_params, &e820ext, &e820ext_size);
+ if (status != EFI_SUCCESS)
+ return status;
+
+ /* Might as well exit boot services now */
+ status = efi_exit_boot_services(handle, &map, &priv, exit_boot_func);
+ if (status != EFI_SUCCESS)
+ return status;
+
+ /* Historic? */
+ boot_params->alt_mem_k = 32 * 1024;
+
+ status = setup_e820(boot_params, e820ext, e820ext_size);
+ if (status != EFI_SUCCESS)
+ return status;
+
+ return EFI_SUCCESS;
+}
+
+/*
+ * On success, we return the address of startup_32, which has potentially been
+ * relocated by efi_relocate_kernel.
+ * On failure, we exit to the firmware via efi_exit instead of returning.
+ */
+unsigned long efi_main(efi_handle_t handle,
+ efi_system_table_t *sys_table_arg,
+ struct boot_params *boot_params)
+{
+ unsigned long bzimage_addr = (unsigned long)startup_32;
+ unsigned long buffer_start, buffer_end;
+ struct setup_header *hdr = &boot_params->hdr;
+ efi_status_t status;
+
+ efi_system_table = sys_table_arg;
+
+ /* Check if we were booted by the EFI firmware */
+ if (efi_system_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
+ efi_exit(handle, EFI_INVALID_PARAMETER);
+
+ /*
+ * If the kernel isn't already loaded at a suitable address,
+ * relocate it.
+ *
+ * It must be loaded above LOAD_PHYSICAL_ADDR.
+ *
+ * The maximum address for 64-bit is 1 << 46 for 4-level paging. This
+ * is defined as the macro MAXMEM, but unfortunately that is not a
+ * compile-time constant if 5-level paging is configured, so we instead
+ * define our own macro for use here.
+ *
+ * For 32-bit, the maximum address is complicated to figure out, for
+ * now use KERNEL_IMAGE_SIZE, which will be 512MiB, the same as what
+ * KASLR uses.
+ *
+ * Also relocate it if image_offset is zero, i.e. the kernel wasn't
+ * loaded by LoadImage, but rather by a bootloader that called the
+ * handover entry. The reason we must always relocate in this case is
+ * to handle the case of systemd-boot booting a unified kernel image,
+ * which is a PE executable that contains the bzImage and an initrd as
+ * COFF sections. The initrd section is placed after the bzImage
+ * without ensuring that there are at least init_size bytes available
+ * for the bzImage, and thus the compressed kernel's startup code may
+ * overwrite the initrd unless it is moved out of the way.
+ */
+
+ buffer_start = ALIGN(bzimage_addr - image_offset,
+ hdr->kernel_alignment);
+ buffer_end = buffer_start + hdr->init_size;
+
+ if ((buffer_start < LOAD_PHYSICAL_ADDR) ||
+ (IS_ENABLED(CONFIG_X86_32) && buffer_end > KERNEL_IMAGE_SIZE) ||
+ (IS_ENABLED(CONFIG_X86_64) && buffer_end > MAXMEM_X86_64_4LEVEL) ||
+ (image_offset == 0)) {
+ status = efi_relocate_kernel(&bzimage_addr,
+ hdr->init_size, hdr->init_size,
+ hdr->pref_address,
+ hdr->kernel_alignment,
+ LOAD_PHYSICAL_ADDR);
+ if (status != EFI_SUCCESS) {
+ efi_err("efi_relocate_kernel() failed!\n");
+ goto fail;
+ }
+ /*
+ * Now that we've copied the kernel elsewhere, we no longer
+ * have a set up block before startup_32(), so reset image_offset
+ * to zero in case it was set earlier.
+ */
+ image_offset = 0;
+ }
+
+#ifdef CONFIG_CMDLINE_BOOL
+ status = efi_parse_options(CONFIG_CMDLINE);
+ if (status != EFI_SUCCESS) {
+ efi_err("Failed to parse options\n");
+ goto fail;
+ }
+#endif
+ if (!IS_ENABLED(CONFIG_CMDLINE_OVERRIDE)) {
+ unsigned long cmdline_paddr = ((u64)hdr->cmd_line_ptr |
+ ((u64)boot_params->ext_cmd_line_ptr << 32));
+ status = efi_parse_options((char *)cmdline_paddr);
+ if (status != EFI_SUCCESS) {
+ efi_err("Failed to parse options\n");
+ goto fail;
+ }
+ }
+
+ /*
+ * At this point, an initrd may already have been loaded by the
+ * bootloader and passed via bootparams. We permit an initrd loaded
+ * from the LINUX_EFI_INITRD_MEDIA_GUID device path to supersede it.
+ *
+ * If the device path is not present, any command-line initrd=
+ * arguments will be processed only if image is not NULL, which will be
+ * the case only if we were loaded via the PE entry point.
+ */
+ if (!efi_noinitrd) {
+ unsigned long addr, size;
+
+ status = efi_load_initrd(image, &addr, &size,
+ hdr->initrd_addr_max, ULONG_MAX);
+
+ if (status != EFI_SUCCESS) {
+ efi_err("Failed to load initrd!\n");
+ goto fail;
+ }
+ if (size > 0) {
+ efi_set_u64_split(addr, &hdr->ramdisk_image,
+ &boot_params->ext_ramdisk_image);
+ efi_set_u64_split(size, &hdr->ramdisk_size,
+ &boot_params->ext_ramdisk_size);
+ }
+ }
+
+ /*
+ * If the boot loader gave us a value for secure_boot then we use that,
+ * otherwise we ask the BIOS.
+ */
+ if (boot_params->secure_boot == efi_secureboot_mode_unset)
+ boot_params->secure_boot = efi_get_secureboot();
+
+ /* Ask the firmware to clear memory on unclean shutdown */
+ efi_enable_reset_attack_mitigation();
+
+ efi_random_get_seed();
+
+ efi_retrieve_tpm2_eventlog();
+
+ setup_graphics(boot_params);
+
+ setup_efi_pci(boot_params);
+
+ setup_quirks(boot_params);
+
+ status = exit_boot(boot_params, handle);
+ if (status != EFI_SUCCESS) {
+ efi_err("exit_boot() failed!\n");
+ goto fail;
+ }
+
+ return bzimage_addr;
+fail:
+ efi_err("efi_main() failed!\n");
+
+ efi_exit(handle, status);
+}