v4.19.13 snapshot.
diff --git a/drivers/firmware/efi/libstub/fdt.c b/drivers/firmware/efi/libstub/fdt.c
new file mode 100644
index 0000000..0c0d231
--- /dev/null
+++ b/drivers/firmware/efi/libstub/fdt.c
@@ -0,0 +1,391 @@
+/*
+ * FDT related Helper functions used by the EFI stub on multiple
+ * architectures. This should be #included by the EFI stub
+ * implementation files.
+ *
+ * Copyright 2013 Linaro Limited; author Roy Franz
+ *
+ * This file is part of the Linux kernel, and is made available
+ * under the terms of the GNU General Public License version 2.
+ *
+ */
+
+#include <linux/efi.h>
+#include <linux/libfdt.h>
+#include <asm/efi.h>
+
+#include "efistub.h"
+
+#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)
+{
+ int offset;
+
+ offset = fdt_path_offset(fdt, "/");
+ /* Set the #address-cells and #size-cells values for an empty tree */
+
+ fdt_setprop_u32(fdt, offset, "#address-cells",
+ EFI_DT_ADDR_CELLS_DEFAULT);
+
+ 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,
+ void *fdt, int new_fdt_size, char *cmdline_ptr,
+ u64 initrd_addr, u64 initrd_size)
+{
+ int node, num_rsv;
+ int status;
+ u32 fdt_val32;
+ u64 fdt_val64;
+
+ /* 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");
+ return EFI_LOAD_ERROR;
+ }
+ /*
+ * We don't get the size of the FDT if we get if from a
+ * configuration table.
+ */
+ if (orig_fdt_size && fdt_totalsize(orig_fdt) > orig_fdt_size) {
+ pr_efi_err(sys_table, "Truncated device tree! foo!\n");
+ return EFI_LOAD_ERROR;
+ }
+ }
+
+ if (orig_fdt) {
+ status = fdt_open_into(orig_fdt, fdt, new_fdt_size);
+ } else {
+ status = fdt_create_empty_tree(fdt, new_fdt_size);
+ if (status == 0) {
+ /*
+ * Any failure from the following function is non
+ * critical
+ */
+ fdt_update_cell_size(sys_table, fdt);
+ }
+ }
+
+ if (status != 0)
+ goto fdt_set_fail;
+
+ /*
+ * Delete all memory reserve map entries. When booting via UEFI,
+ * kernel will use the UEFI memory map to find reserved regions.
+ */
+ num_rsv = fdt_num_mem_rsv(fdt);
+ while (num_rsv-- > 0)
+ fdt_del_mem_rsv(fdt, num_rsv);
+
+ node = fdt_subnode_offset(fdt, 0, "chosen");
+ if (node < 0) {
+ node = fdt_add_subnode(fdt, 0, "chosen");
+ if (node < 0) {
+ status = node; /* node is error code when negative */
+ goto fdt_set_fail;
+ }
+ }
+
+ if ((cmdline_ptr != NULL) && (strlen(cmdline_ptr) > 0)) {
+ status = fdt_setprop(fdt, node, "bootargs", cmdline_ptr,
+ strlen(cmdline_ptr) + 1);
+ if (status)
+ goto fdt_set_fail;
+ }
+
+ /* Set initrd address/end in device tree, if present */
+ if (initrd_size != 0) {
+ u64 initrd_image_end;
+ u64 initrd_image_start = cpu_to_fdt64(initrd_addr);
+
+ status = fdt_setprop(fdt, node, "linux,initrd-start",
+ &initrd_image_start, sizeof(u64));
+ if (status)
+ goto fdt_set_fail;
+ initrd_image_end = cpu_to_fdt64(initrd_addr + initrd_size);
+ status = fdt_setprop(fdt, node, "linux,initrd-end",
+ &initrd_image_end, sizeof(u64));
+ if (status)
+ goto fdt_set_fail;
+ }
+
+ /* 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);
+ status = fdt_setprop(fdt, node, "linux,uefi-system-table",
+ &fdt_val64, sizeof(fdt_val64));
+ if (status)
+ goto fdt_set_fail;
+
+ fdt_val64 = U64_MAX; /* placeholder */
+ status = fdt_setprop(fdt, node, "linux,uefi-mmap-start",
+ &fdt_val64, sizeof(fdt_val64));
+ if (status)
+ goto fdt_set_fail;
+
+ fdt_val32 = U32_MAX; /* placeholder */
+ status = fdt_setprop(fdt, node, "linux,uefi-mmap-size",
+ &fdt_val32, sizeof(fdt_val32));
+ if (status)
+ goto fdt_set_fail;
+
+ status = fdt_setprop(fdt, node, "linux,uefi-mmap-desc-size",
+ &fdt_val32, sizeof(fdt_val32));
+ if (status)
+ goto fdt_set_fail;
+
+ status = fdt_setprop(fdt, node, "linux,uefi-mmap-desc-ver",
+ &fdt_val32, sizeof(fdt_val32));
+ if (status)
+ goto fdt_set_fail;
+
+ if (IS_ENABLED(CONFIG_RANDOMIZE_BASE)) {
+ efi_status_t efi_status;
+
+ efi_status = efi_get_random_bytes(sys_table, sizeof(fdt_val64),
+ (u8 *)&fdt_val64);
+ if (efi_status == EFI_SUCCESS) {
+ status = fdt_setprop(fdt, node, "kaslr-seed",
+ &fdt_val64, sizeof(fdt_val64));
+ if (status)
+ goto fdt_set_fail;
+ } else if (efi_status != EFI_NOT_FOUND) {
+ return efi_status;
+ }
+ }
+
+ /* shrink the FDT back to its minimum size */
+ fdt_pack(fdt);
+
+ return EFI_SUCCESS;
+
+fdt_set_fail:
+ if (status == -FDT_ERR_NOSPACE)
+ return EFI_BUFFER_TOO_SMALL;
+
+ return EFI_LOAD_ERROR;
+}
+
+static efi_status_t update_fdt_memmap(void *fdt, struct efi_boot_memmap *map)
+{
+ int node = fdt_path_offset(fdt, "/chosen");
+ u64 fdt_val64;
+ u32 fdt_val32;
+ int err;
+
+ if (node < 0)
+ return EFI_LOAD_ERROR;
+
+ fdt_val64 = cpu_to_fdt64((unsigned long)*map->map);
+ err = fdt_setprop_inplace(fdt, node, "linux,uefi-mmap-start",
+ &fdt_val64, sizeof(fdt_val64));
+ if (err)
+ return EFI_LOAD_ERROR;
+
+ fdt_val32 = cpu_to_fdt32(*map->map_size);
+ err = fdt_setprop_inplace(fdt, node, "linux,uefi-mmap-size",
+ &fdt_val32, sizeof(fdt_val32));
+ if (err)
+ return EFI_LOAD_ERROR;
+
+ fdt_val32 = cpu_to_fdt32(*map->desc_size);
+ err = fdt_setprop_inplace(fdt, node, "linux,uefi-mmap-desc-size",
+ &fdt_val32, sizeof(fdt_val32));
+ if (err)
+ return EFI_LOAD_ERROR;
+
+ fdt_val32 = cpu_to_fdt32(*map->desc_ver);
+ err = fdt_setprop_inplace(fdt, node, "linux,uefi-mmap-desc-ver",
+ &fdt_val32, sizeof(fdt_val32));
+ if (err)
+ return EFI_LOAD_ERROR;
+
+ 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,
+ void *priv)
+{
+ struct exit_boot_struct *p = priv;
+ /*
+ * Update the memory map with virtual addresses. The function will also
+ * populate @runtime_map with copies of just the EFI_MEMORY_RUNTIME
+ * entries so that we can pass it straight to SetVirtualAddressMap()
+ */
+ efi_get_virtmap(*map->map, *map->map_size, *map->desc_size,
+ p->runtime_map, p->runtime_entry_count);
+
+ return update_fdt_memmap(p->new_fdt_addr, map);
+}
+
+#ifndef MAX_FDT_SIZE
+#define MAX_FDT_SIZE SZ_2M
+#endif
+
+/*
+ * Allocate memory for a new FDT, then add EFI, commandline, and
+ * initrd related fields to the FDT. This routine increases the
+ * FDT allocation size until the allocated memory is large
+ * enough. EFI allocations are in EFI_PAGE_SIZE granules,
+ * which are fixed at 4K bytes, so in most cases the first
+ * allocation should succeed.
+ * EFI boot services are exited at the end of this function.
+ * There must be no allocations between the get_memory_map()
+ * call and the exit_boot_services() call, so the exiting of
+ * boot services is very tightly tied to the creation of the FDT
+ * with the final memory map in it.
+ */
+
+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)
+{
+ unsigned long map_size, desc_size, buff_size;
+ u32 desc_ver;
+ unsigned long mmap_key;
+ efi_memory_desc_t *memory_map, *runtime_map;
+ efi_status_t status;
+ int runtime_entry_count = 0;
+ struct efi_boot_memmap map;
+ struct exit_boot_struct priv;
+
+ map.map = &runtime_map;
+ map.map_size = &map_size;
+ map.desc_size = &desc_size;
+ map.desc_ver = &desc_ver;
+ map.key_ptr = &mmap_key;
+ map.buff_size = &buff_size;
+
+ /*
+ * Get a copy of the current memory map that we will use to prepare
+ * the input for SetVirtualAddressMap(). We don't have to worry about
+ * subsequent allocations adding entries, since they could not affect
+ * the number of EFI_MEMORY_RUNTIME regions.
+ */
+ status = efi_get_memory_map(sys_table, &map);
+ if (status != EFI_SUCCESS) {
+ pr_efi_err(sys_table, "Unable to retrieve UEFI memory map.\n");
+ return status;
+ }
+
+ pr_efi(sys_table,
+ "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);
+ if (status != EFI_SUCCESS) {
+ pr_efi_err(sys_table,
+ "Unable to allocate memory for new device tree.\n");
+ goto fail;
+ }
+
+ /*
+ * 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);
+ if (status != EFI_SUCCESS)
+ goto fail_free_new_fdt;
+
+ status = update_fdt(sys_table, (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");
+ goto fail_free_new_fdt;
+ }
+
+ priv.runtime_map = runtime_map;
+ 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);
+
+ if (status == EFI_SUCCESS) {
+ efi_set_virtual_address_map_t *svam;
+
+ /* Install the new virtual address map */
+ svam = sys_table->runtime->set_virtual_address_map;
+ status = svam(runtime_entry_count * desc_size, desc_size,
+ desc_ver, runtime_map);
+
+ /*
+ * We are beyond the point of no return here, so if the call to
+ * SetVirtualAddressMap() failed, we need to signal that to the
+ * incoming kernel but proceed normally otherwise.
+ */
+ if (status != EFI_SUCCESS) {
+ int l;
+
+ /*
+ * Set the virtual address field of all
+ * EFI_MEMORY_RUNTIME entries to 0. This will signal
+ * the incoming kernel that no virtual translation has
+ * been installed.
+ */
+ for (l = 0; l < map_size; l += desc_size) {
+ efi_memory_desc_t *p = (void *)memory_map + l;
+
+ if (p->attribute & EFI_MEMORY_RUNTIME)
+ p->virt_addr = 0;
+ }
+ }
+ return EFI_SUCCESS;
+ }
+
+ pr_efi_err(sys_table, "Exit boot services failed.\n");
+
+fail_free_new_fdt:
+ efi_free(sys_table, MAX_FDT_SIZE, *new_fdt_addr);
+
+fail:
+ sys_table->boottime->free_pool(runtime_map);
+ return EFI_LOAD_ERROR;
+}
+
+void *get_fdt(efi_system_table_t *sys_table, unsigned long *fdt_size)
+{
+ efi_guid_t fdt_guid = DEVICE_TREE_GUID;
+ efi_config_table_t *tables;
+ void *fdt;
+ int i;
+
+ tables = (efi_config_table_t *) sys_table->tables;
+ fdt = NULL;
+
+ for (i = 0; i < sys_table->nr_tables; i++)
+ if (efi_guidcmp(tables[i].guid, fdt_guid) == 0) {
+ fdt = (void *) tables[i].table;
+ if (fdt_check_header(fdt) != 0) {
+ pr_efi_err(sys_table, "Invalid header detected on UEFI supplied FDT, ignoring ...\n");
+ return NULL;
+ }
+ *fdt_size = fdt_totalsize(fdt);
+ break;
+ }
+
+ return fdt;
+}