v4.19.13 snapshot.
diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
new file mode 100644
index 0000000..8aaaa42
--- /dev/null
+++ b/arch/mips/kernel/setup.c
@@ -0,0 +1,1099 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1995 Linus Torvalds
+ * Copyright (C) 1995 Waldorf Electronics
+ * Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 01, 02, 03 Ralf Baechle
+ * Copyright (C) 1996 Stoned Elipot
+ * Copyright (C) 1999 Silicon Graphics, Inc.
+ * Copyright (C) 2000, 2001, 2002, 2007 Maciej W. Rozycki
+ */
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/export.h>
+#include <linux/screen_info.h>
+#include <linux/memblock.h>
+#include <linux/bootmem.h>
+#include <linux/initrd.h>
+#include <linux/root_dev.h>
+#include <linux/highmem.h>
+#include <linux/console.h>
+#include <linux/pfn.h>
+#include <linux/debugfs.h>
+#include <linux/kexec.h>
+#include <linux/sizes.h>
+#include <linux/device.h>
+#include <linux/dma-contiguous.h>
+#include <linux/decompress/generic.h>
+#include <linux/of_fdt.h>
+
+#include <asm/addrspace.h>
+#include <asm/bootinfo.h>
+#include <asm/bugs.h>
+#include <asm/cache.h>
+#include <asm/cdmm.h>
+#include <asm/cpu.h>
+#include <asm/debug.h>
+#include <asm/dma-coherence.h>
+#include <asm/sections.h>
+#include <asm/setup.h>
+#include <asm/smp-ops.h>
+#include <asm/prom.h>
+
+#ifdef CONFIG_MIPS_ELF_APPENDED_DTB
+const char __section(.appended_dtb) __appended_dtb[0x100000];
+#endif /* CONFIG_MIPS_ELF_APPENDED_DTB */
+
+struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
+
+EXPORT_SYMBOL(cpu_data);
+
+#ifdef CONFIG_VT
+struct screen_info screen_info;
+#endif
+
+/*
+ * Setup information
+ *
+ * These are initialized so they are in the .data section
+ */
+unsigned long mips_machtype __read_mostly = MACH_UNKNOWN;
+
+EXPORT_SYMBOL(mips_machtype);
+
+struct boot_mem_map boot_mem_map;
+
+static char __initdata command_line[COMMAND_LINE_SIZE];
+char __initdata arcs_cmdline[COMMAND_LINE_SIZE];
+
+#ifdef CONFIG_CMDLINE_BOOL
+static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
+#endif
+
+/*
+ * mips_io_port_base is the begin of the address space to which x86 style
+ * I/O ports are mapped.
+ */
+const unsigned long mips_io_port_base = -1;
+EXPORT_SYMBOL(mips_io_port_base);
+
+static struct resource code_resource = { .name = "Kernel code", };
+static struct resource data_resource = { .name = "Kernel data", };
+static struct resource bss_resource = { .name = "Kernel bss", };
+
+static void *detect_magic __initdata = detect_memory_region;
+
+#ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
+unsigned long ARCH_PFN_OFFSET;
+EXPORT_SYMBOL(ARCH_PFN_OFFSET);
+#endif
+
+void __init add_memory_region(phys_addr_t start, phys_addr_t size, long type)
+{
+ int x = boot_mem_map.nr_map;
+ int i;
+
+ /*
+ * If the region reaches the top of the physical address space, adjust
+ * the size slightly so that (start + size) doesn't overflow
+ */
+ if (start + size - 1 == PHYS_ADDR_MAX)
+ --size;
+
+ /* Sanity check */
+ if (start + size < start) {
+ pr_warn("Trying to add an invalid memory region, skipped\n");
+ return;
+ }
+
+ /*
+ * Try to merge with existing entry, if any.
+ */
+ for (i = 0; i < boot_mem_map.nr_map; i++) {
+ struct boot_mem_map_entry *entry = boot_mem_map.map + i;
+ unsigned long top;
+
+ if (entry->type != type)
+ continue;
+
+ if (start + size < entry->addr)
+ continue; /* no overlap */
+
+ if (entry->addr + entry->size < start)
+ continue; /* no overlap */
+
+ top = max(entry->addr + entry->size, start + size);
+ entry->addr = min(entry->addr, start);
+ entry->size = top - entry->addr;
+
+ return;
+ }
+
+ if (boot_mem_map.nr_map == BOOT_MEM_MAP_MAX) {
+ pr_err("Ooops! Too many entries in the memory map!\n");
+ return;
+ }
+
+ boot_mem_map.map[x].addr = start;
+ boot_mem_map.map[x].size = size;
+ boot_mem_map.map[x].type = type;
+ boot_mem_map.nr_map++;
+}
+
+void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max)
+{
+ void *dm = &detect_magic;
+ phys_addr_t size;
+
+ for (size = sz_min; size < sz_max; size <<= 1) {
+ if (!memcmp(dm, dm + size, sizeof(detect_magic)))
+ break;
+ }
+
+ pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n",
+ ((unsigned long long) size) / SZ_1M,
+ (unsigned long long) start,
+ ((unsigned long long) sz_min) / SZ_1M,
+ ((unsigned long long) sz_max) / SZ_1M);
+
+ add_memory_region(start, size, BOOT_MEM_RAM);
+}
+
+static bool __init __maybe_unused memory_region_available(phys_addr_t start,
+ phys_addr_t size)
+{
+ int i;
+ bool in_ram = false, free = true;
+
+ for (i = 0; i < boot_mem_map.nr_map; i++) {
+ phys_addr_t start_, end_;
+
+ start_ = boot_mem_map.map[i].addr;
+ end_ = boot_mem_map.map[i].addr + boot_mem_map.map[i].size;
+
+ switch (boot_mem_map.map[i].type) {
+ case BOOT_MEM_RAM:
+ if (start >= start_ && start + size <= end_)
+ in_ram = true;
+ break;
+ case BOOT_MEM_RESERVED:
+ if ((start >= start_ && start < end_) ||
+ (start < start_ && start + size >= start_))
+ free = false;
+ break;
+ default:
+ continue;
+ }
+ }
+
+ return in_ram && free;
+}
+
+static void __init print_memory_map(void)
+{
+ int i;
+ const int field = 2 * sizeof(unsigned long);
+
+ for (i = 0; i < boot_mem_map.nr_map; i++) {
+ printk(KERN_INFO " memory: %0*Lx @ %0*Lx ",
+ field, (unsigned long long) boot_mem_map.map[i].size,
+ field, (unsigned long long) boot_mem_map.map[i].addr);
+
+ switch (boot_mem_map.map[i].type) {
+ case BOOT_MEM_RAM:
+ printk(KERN_CONT "(usable)\n");
+ break;
+ case BOOT_MEM_INIT_RAM:
+ printk(KERN_CONT "(usable after init)\n");
+ break;
+ case BOOT_MEM_ROM_DATA:
+ printk(KERN_CONT "(ROM data)\n");
+ break;
+ case BOOT_MEM_RESERVED:
+ printk(KERN_CONT "(reserved)\n");
+ break;
+ default:
+ printk(KERN_CONT "type %lu\n", boot_mem_map.map[i].type);
+ break;
+ }
+ }
+}
+
+/*
+ * Manage initrd
+ */
+#ifdef CONFIG_BLK_DEV_INITRD
+
+static int __init rd_start_early(char *p)
+{
+ unsigned long start = memparse(p, &p);
+
+#ifdef CONFIG_64BIT
+ /* Guess if the sign extension was forgotten by bootloader */
+ if (start < XKPHYS)
+ start = (int)start;
+#endif
+ initrd_start = start;
+ initrd_end += start;
+ return 0;
+}
+early_param("rd_start", rd_start_early);
+
+static int __init rd_size_early(char *p)
+{
+ initrd_end += memparse(p, &p);
+ return 0;
+}
+early_param("rd_size", rd_size_early);
+
+/* it returns the next free pfn after initrd */
+static unsigned long __init init_initrd(void)
+{
+ unsigned long end;
+
+ /*
+ * Board specific code or command line parser should have
+ * already set up initrd_start and initrd_end. In these cases
+ * perfom sanity checks and use them if all looks good.
+ */
+ if (!initrd_start || initrd_end <= initrd_start)
+ goto disable;
+
+ if (initrd_start & ~PAGE_MASK) {
+ pr_err("initrd start must be page aligned\n");
+ goto disable;
+ }
+ if (initrd_start < PAGE_OFFSET) {
+ pr_err("initrd start < PAGE_OFFSET\n");
+ goto disable;
+ }
+
+ /*
+ * Sanitize initrd addresses. For example firmware
+ * can't guess if they need to pass them through
+ * 64-bits values if the kernel has been built in pure
+ * 32-bit. We need also to switch from KSEG0 to XKPHYS
+ * addresses now, so the code can now safely use __pa().
+ */
+ end = __pa(initrd_end);
+ initrd_end = (unsigned long)__va(end);
+ initrd_start = (unsigned long)__va(__pa(initrd_start));
+
+ ROOT_DEV = Root_RAM0;
+ return PFN_UP(end);
+disable:
+ initrd_start = 0;
+ initrd_end = 0;
+ return 0;
+}
+
+/* In some conditions (e.g. big endian bootloader with a little endian
+ kernel), the initrd might appear byte swapped. Try to detect this and
+ byte swap it if needed. */
+static void __init maybe_bswap_initrd(void)
+{
+#if defined(CONFIG_CPU_CAVIUM_OCTEON)
+ u64 buf;
+
+ /* Check for CPIO signature */
+ if (!memcmp((void *)initrd_start, "070701", 6))
+ return;
+
+ /* Check for compressed initrd */
+ if (decompress_method((unsigned char *)initrd_start, 8, NULL))
+ return;
+
+ /* Try again with a byte swapped header */
+ buf = swab64p((u64 *)initrd_start);
+ if (!memcmp(&buf, "070701", 6) ||
+ decompress_method((unsigned char *)(&buf), 8, NULL)) {
+ unsigned long i;
+
+ pr_info("Byteswapped initrd detected\n");
+ for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8)
+ swab64s((u64 *)i);
+ }
+#endif
+}
+
+static void __init finalize_initrd(void)
+{
+ unsigned long size = initrd_end - initrd_start;
+
+ if (size == 0) {
+ printk(KERN_INFO "Initrd not found or empty");
+ goto disable;
+ }
+ if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
+ printk(KERN_ERR "Initrd extends beyond end of memory");
+ goto disable;
+ }
+
+ maybe_bswap_initrd();
+
+ reserve_bootmem(__pa(initrd_start), size, BOOTMEM_DEFAULT);
+ initrd_below_start_ok = 1;
+
+ pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
+ initrd_start, size);
+ return;
+disable:
+ printk(KERN_CONT " - disabling initrd\n");
+ initrd_start = 0;
+ initrd_end = 0;
+}
+
+#else /* !CONFIG_BLK_DEV_INITRD */
+
+static unsigned long __init init_initrd(void)
+{
+ return 0;
+}
+
+#define finalize_initrd() do {} while (0)
+
+#endif
+
+/*
+ * Initialize the bootmem allocator. It also setup initrd related data
+ * if needed.
+ */
+#if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON3) && defined(CONFIG_NUMA))
+
+static void __init bootmem_init(void)
+{
+ init_initrd();
+ finalize_initrd();
+}
+
+#else /* !CONFIG_SGI_IP27 */
+
+static unsigned long __init bootmap_bytes(unsigned long pages)
+{
+ unsigned long bytes = DIV_ROUND_UP(pages, 8);
+
+ return ALIGN(bytes, sizeof(long));
+}
+
+static void __init bootmem_init(void)
+{
+ unsigned long reserved_end;
+ unsigned long mapstart = ~0UL;
+ unsigned long bootmap_size;
+ phys_addr_t ramstart = PHYS_ADDR_MAX;
+ bool bootmap_valid = false;
+ int i;
+
+ /*
+ * Sanity check any INITRD first. We don't take it into account
+ * for bootmem setup initially, rely on the end-of-kernel-code
+ * as our memory range starting point. Once bootmem is inited we
+ * will reserve the area used for the initrd.
+ */
+ init_initrd();
+ reserved_end = (unsigned long) PFN_UP(__pa_symbol(&_end));
+
+ /*
+ * max_low_pfn is not a number of pages. The number of pages
+ * of the system is given by 'max_low_pfn - min_low_pfn'.
+ */
+ min_low_pfn = ~0UL;
+ max_low_pfn = 0;
+
+ /*
+ * Find the highest page frame number we have available
+ * and the lowest used RAM address
+ */
+ for (i = 0; i < boot_mem_map.nr_map; i++) {
+ unsigned long start, end;
+
+ if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
+ continue;
+
+ start = PFN_UP(boot_mem_map.map[i].addr);
+ end = PFN_DOWN(boot_mem_map.map[i].addr
+ + boot_mem_map.map[i].size);
+
+ ramstart = min(ramstart, boot_mem_map.map[i].addr);
+
+#ifndef CONFIG_HIGHMEM
+ /*
+ * Skip highmem here so we get an accurate max_low_pfn if low
+ * memory stops short of high memory.
+ * If the region overlaps HIGHMEM_START, end is clipped so
+ * max_pfn excludes the highmem portion.
+ */
+ if (start >= PFN_DOWN(HIGHMEM_START))
+ continue;
+ if (end > PFN_DOWN(HIGHMEM_START))
+ end = PFN_DOWN(HIGHMEM_START);
+#endif
+
+ if (end > max_low_pfn)
+ max_low_pfn = end;
+ if (start < min_low_pfn)
+ min_low_pfn = start;
+ if (end <= reserved_end)
+ continue;
+#ifdef CONFIG_BLK_DEV_INITRD
+ /* Skip zones before initrd and initrd itself */
+ if (initrd_end && end <= (unsigned long)PFN_UP(__pa(initrd_end)))
+ continue;
+#endif
+ if (start >= mapstart)
+ continue;
+ mapstart = max(reserved_end, start);
+ }
+
+ if (min_low_pfn >= max_low_pfn)
+ panic("Incorrect memory mapping !!!");
+
+#ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
+ ARCH_PFN_OFFSET = PFN_UP(ramstart);
+#else
+ /*
+ * Reserve any memory between the start of RAM and PHYS_OFFSET
+ */
+ if (ramstart > PHYS_OFFSET)
+ add_memory_region(PHYS_OFFSET, ramstart - PHYS_OFFSET,
+ BOOT_MEM_RESERVED);
+
+ if (min_low_pfn > ARCH_PFN_OFFSET) {
+ pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
+ (min_low_pfn - ARCH_PFN_OFFSET) * sizeof(struct page),
+ min_low_pfn - ARCH_PFN_OFFSET);
+ } else if (ARCH_PFN_OFFSET - min_low_pfn > 0UL) {
+ pr_info("%lu free pages won't be used\n",
+ ARCH_PFN_OFFSET - min_low_pfn);
+ }
+ min_low_pfn = ARCH_PFN_OFFSET;
+#endif
+
+ /*
+ * Determine low and high memory ranges
+ */
+ max_pfn = max_low_pfn;
+ if (max_low_pfn > PFN_DOWN(HIGHMEM_START)) {
+#ifdef CONFIG_HIGHMEM
+ highstart_pfn = PFN_DOWN(HIGHMEM_START);
+ highend_pfn = max_low_pfn;
+#endif
+ max_low_pfn = PFN_DOWN(HIGHMEM_START);
+ }
+
+#ifdef CONFIG_BLK_DEV_INITRD
+ /*
+ * mapstart should be after initrd_end
+ */
+ if (initrd_end)
+ mapstart = max(mapstart, (unsigned long)PFN_UP(__pa(initrd_end)));
+#endif
+
+ /*
+ * check that mapstart doesn't overlap with any of
+ * memory regions that have been reserved through eg. DTB
+ */
+ bootmap_size = bootmap_bytes(max_low_pfn - min_low_pfn);
+
+ bootmap_valid = memory_region_available(PFN_PHYS(mapstart),
+ bootmap_size);
+ for (i = 0; i < boot_mem_map.nr_map && !bootmap_valid; i++) {
+ unsigned long mapstart_addr;
+
+ switch (boot_mem_map.map[i].type) {
+ case BOOT_MEM_RESERVED:
+ mapstart_addr = PFN_ALIGN(boot_mem_map.map[i].addr +
+ boot_mem_map.map[i].size);
+ if (PHYS_PFN(mapstart_addr) < mapstart)
+ break;
+
+ bootmap_valid = memory_region_available(mapstart_addr,
+ bootmap_size);
+ if (bootmap_valid)
+ mapstart = PHYS_PFN(mapstart_addr);
+ break;
+ default:
+ break;
+ }
+ }
+
+ if (!bootmap_valid)
+ panic("No memory area to place a bootmap bitmap");
+
+ /*
+ * Initialize the boot-time allocator with low memory only.
+ */
+ if (bootmap_size != init_bootmem_node(NODE_DATA(0), mapstart,
+ min_low_pfn, max_low_pfn))
+ panic("Unexpected memory size required for bootmap");
+
+ for (i = 0; i < boot_mem_map.nr_map; i++) {
+ unsigned long start, end;
+
+ start = PFN_UP(boot_mem_map.map[i].addr);
+ end = PFN_DOWN(boot_mem_map.map[i].addr
+ + boot_mem_map.map[i].size);
+
+ if (start <= min_low_pfn)
+ start = min_low_pfn;
+ if (start >= end)
+ continue;
+
+#ifndef CONFIG_HIGHMEM
+ if (end > max_low_pfn)
+ end = max_low_pfn;
+
+ /*
+ * ... finally, is the area going away?
+ */
+ if (end <= start)
+ continue;
+#endif
+
+ memblock_add_node(PFN_PHYS(start), PFN_PHYS(end - start), 0);
+ }
+
+ /*
+ * Register fully available low RAM pages with the bootmem allocator.
+ */
+ for (i = 0; i < boot_mem_map.nr_map; i++) {
+ unsigned long start, end, size;
+
+ start = PFN_UP(boot_mem_map.map[i].addr);
+ end = PFN_DOWN(boot_mem_map.map[i].addr
+ + boot_mem_map.map[i].size);
+
+ /*
+ * Reserve usable memory.
+ */
+ switch (boot_mem_map.map[i].type) {
+ case BOOT_MEM_RAM:
+ break;
+ case BOOT_MEM_INIT_RAM:
+ memory_present(0, start, end);
+ continue;
+ default:
+ /* Not usable memory */
+ if (start > min_low_pfn && end < max_low_pfn)
+ reserve_bootmem(boot_mem_map.map[i].addr,
+ boot_mem_map.map[i].size,
+ BOOTMEM_DEFAULT);
+ continue;
+ }
+
+ /*
+ * We are rounding up the start address of usable memory
+ * and at the end of the usable range downwards.
+ */
+ if (start >= max_low_pfn)
+ continue;
+ if (start < reserved_end)
+ start = reserved_end;
+ if (end > max_low_pfn)
+ end = max_low_pfn;
+
+ /*
+ * ... finally, is the area going away?
+ */
+ if (end <= start)
+ continue;
+ size = end - start;
+
+ /* Register lowmem ranges */
+ free_bootmem(PFN_PHYS(start), size << PAGE_SHIFT);
+ memory_present(0, start, end);
+ }
+
+ /*
+ * Reserve the bootmap memory.
+ */
+ reserve_bootmem(PFN_PHYS(mapstart), bootmap_size, BOOTMEM_DEFAULT);
+
+#ifdef CONFIG_RELOCATABLE
+ /*
+ * The kernel reserves all memory below its _end symbol as bootmem,
+ * but the kernel may now be at a much higher address. The memory
+ * between the original and new locations may be returned to the system.
+ */
+ if (__pa_symbol(_text) > __pa_symbol(VMLINUX_LOAD_ADDRESS)) {
+ unsigned long offset;
+ extern void show_kernel_relocation(const char *level);
+
+ offset = __pa_symbol(_text) - __pa_symbol(VMLINUX_LOAD_ADDRESS);
+ free_bootmem(__pa_symbol(VMLINUX_LOAD_ADDRESS), offset);
+
+#if defined(CONFIG_DEBUG_KERNEL) && defined(CONFIG_DEBUG_INFO)
+ /*
+ * This information is necessary when debugging the kernel
+ * But is a security vulnerability otherwise!
+ */
+ show_kernel_relocation(KERN_INFO);
+#endif
+ }
+#endif
+
+ /*
+ * Reserve initrd memory if needed.
+ */
+ finalize_initrd();
+}
+
+#endif /* CONFIG_SGI_IP27 */
+
+/*
+ * arch_mem_init - initialize memory management subsystem
+ *
+ * o plat_mem_setup() detects the memory configuration and will record detected
+ * memory areas using add_memory_region.
+ *
+ * At this stage the memory configuration of the system is known to the
+ * kernel but generic memory management system is still entirely uninitialized.
+ *
+ * o bootmem_init()
+ * o sparse_init()
+ * o paging_init()
+ * o dma_contiguous_reserve()
+ *
+ * At this stage the bootmem allocator is ready to use.
+ *
+ * NOTE: historically plat_mem_setup did the entire platform initialization.
+ * This was rather impractical because it meant plat_mem_setup had to
+ * get away without any kind of memory allocator. To keep old code from
+ * breaking plat_setup was just renamed to plat_mem_setup and a second platform
+ * initialization hook for anything else was introduced.
+ */
+
+static int usermem __initdata;
+
+static int __init early_parse_mem(char *p)
+{
+ phys_addr_t start, size;
+
+ /*
+ * If a user specifies memory size, we
+ * blow away any automatically generated
+ * size.
+ */
+ if (usermem == 0) {
+ boot_mem_map.nr_map = 0;
+ usermem = 1;
+ }
+ start = 0;
+ size = memparse(p, &p);
+ if (*p == '@')
+ start = memparse(p + 1, &p);
+
+ add_memory_region(start, size, BOOT_MEM_RAM);
+
+ return 0;
+}
+early_param("mem", early_parse_mem);
+
+static int __init early_parse_memmap(char *p)
+{
+ char *oldp;
+ u64 start_at, mem_size;
+
+ if (!p)
+ return -EINVAL;
+
+ if (!strncmp(p, "exactmap", 8)) {
+ pr_err("\"memmap=exactmap\" invalid on MIPS\n");
+ return 0;
+ }
+
+ oldp = p;
+ mem_size = memparse(p, &p);
+ if (p == oldp)
+ return -EINVAL;
+
+ if (*p == '@') {
+ start_at = memparse(p+1, &p);
+ add_memory_region(start_at, mem_size, BOOT_MEM_RAM);
+ } else if (*p == '#') {
+ pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on MIPS\n");
+ return -EINVAL;
+ } else if (*p == '$') {
+ start_at = memparse(p+1, &p);
+ add_memory_region(start_at, mem_size, BOOT_MEM_RESERVED);
+ } else {
+ pr_err("\"memmap\" invalid format!\n");
+ return -EINVAL;
+ }
+
+ if (*p == '\0') {
+ usermem = 1;
+ return 0;
+ } else
+ return -EINVAL;
+}
+early_param("memmap", early_parse_memmap);
+
+#ifdef CONFIG_PROC_VMCORE
+unsigned long setup_elfcorehdr, setup_elfcorehdr_size;
+static int __init early_parse_elfcorehdr(char *p)
+{
+ int i;
+
+ setup_elfcorehdr = memparse(p, &p);
+
+ for (i = 0; i < boot_mem_map.nr_map; i++) {
+ unsigned long start = boot_mem_map.map[i].addr;
+ unsigned long end = (boot_mem_map.map[i].addr +
+ boot_mem_map.map[i].size);
+ if (setup_elfcorehdr >= start && setup_elfcorehdr < end) {
+ /*
+ * Reserve from the elf core header to the end of
+ * the memory segment, that should all be kdump
+ * reserved memory.
+ */
+ setup_elfcorehdr_size = end - setup_elfcorehdr;
+ break;
+ }
+ }
+ /*
+ * If we don't find it in the memory map, then we shouldn't
+ * have to worry about it, as the new kernel won't use it.
+ */
+ return 0;
+}
+early_param("elfcorehdr", early_parse_elfcorehdr);
+#endif
+
+static void __init arch_mem_addpart(phys_addr_t mem, phys_addr_t end, int type)
+{
+ phys_addr_t size;
+ int i;
+
+ size = end - mem;
+ if (!size)
+ return;
+
+ /* Make sure it is in the boot_mem_map */
+ for (i = 0; i < boot_mem_map.nr_map; i++) {
+ if (mem >= boot_mem_map.map[i].addr &&
+ mem < (boot_mem_map.map[i].addr +
+ boot_mem_map.map[i].size))
+ return;
+ }
+ add_memory_region(mem, size, type);
+}
+
+#ifdef CONFIG_KEXEC
+static inline unsigned long long get_total_mem(void)
+{
+ unsigned long long total;
+
+ total = max_pfn - min_low_pfn;
+ return total << PAGE_SHIFT;
+}
+
+static void __init mips_parse_crashkernel(void)
+{
+ unsigned long long total_mem;
+ unsigned long long crash_size, crash_base;
+ int ret;
+
+ total_mem = get_total_mem();
+ ret = parse_crashkernel(boot_command_line, total_mem,
+ &crash_size, &crash_base);
+ if (ret != 0 || crash_size <= 0)
+ return;
+
+ if (!memory_region_available(crash_base, crash_size)) {
+ pr_warn("Invalid memory region reserved for crash kernel\n");
+ return;
+ }
+
+ crashk_res.start = crash_base;
+ crashk_res.end = crash_base + crash_size - 1;
+}
+
+static void __init request_crashkernel(struct resource *res)
+{
+ int ret;
+
+ if (crashk_res.start == crashk_res.end)
+ return;
+
+ ret = request_resource(res, &crashk_res);
+ if (!ret)
+ pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
+ (unsigned long)((crashk_res.end -
+ crashk_res.start + 1) >> 20),
+ (unsigned long)(crashk_res.start >> 20));
+}
+#else /* !defined(CONFIG_KEXEC) */
+static void __init mips_parse_crashkernel(void)
+{
+}
+
+static void __init request_crashkernel(struct resource *res)
+{
+}
+#endif /* !defined(CONFIG_KEXEC) */
+
+#define USE_PROM_CMDLINE IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_BOOTLOADER)
+#define USE_DTB_CMDLINE IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB)
+#define EXTEND_WITH_PROM IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND)
+#define BUILTIN_EXTEND_WITH_PROM \
+ IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND)
+
+static void __init arch_mem_init(char **cmdline_p)
+{
+ struct memblock_region *reg;
+ extern void plat_mem_setup(void);
+
+ /*
+ * Initialize boot_command_line to an innocuous but non-empty string in
+ * order to prevent early_init_dt_scan_chosen() from copying
+ * CONFIG_CMDLINE into it without our knowledge. We handle
+ * CONFIG_CMDLINE ourselves below & don't want to duplicate its
+ * content because repeating arguments can be problematic.
+ */
+ strlcpy(boot_command_line, " ", COMMAND_LINE_SIZE);
+
+ /* call board setup routine */
+ plat_mem_setup();
+
+ /*
+ * Make sure all kernel memory is in the maps. The "UP" and
+ * "DOWN" are opposite for initdata since if it crosses over
+ * into another memory section you don't want that to be
+ * freed when the initdata is freed.
+ */
+ arch_mem_addpart(PFN_DOWN(__pa_symbol(&_text)) << PAGE_SHIFT,
+ PFN_UP(__pa_symbol(&_edata)) << PAGE_SHIFT,
+ BOOT_MEM_RAM);
+ arch_mem_addpart(PFN_UP(__pa_symbol(&__init_begin)) << PAGE_SHIFT,
+ PFN_DOWN(__pa_symbol(&__init_end)) << PAGE_SHIFT,
+ BOOT_MEM_INIT_RAM);
+
+ pr_info("Determined physical RAM map:\n");
+ print_memory_map();
+
+#if defined(CONFIG_CMDLINE_BOOL) && defined(CONFIG_CMDLINE_OVERRIDE)
+ strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
+#else
+ if ((USE_PROM_CMDLINE && arcs_cmdline[0]) ||
+ (USE_DTB_CMDLINE && !boot_command_line[0]))
+ strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
+
+ if (EXTEND_WITH_PROM && arcs_cmdline[0]) {
+ if (boot_command_line[0])
+ strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
+ strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
+ }
+
+#if defined(CONFIG_CMDLINE_BOOL)
+ if (builtin_cmdline[0]) {
+ if (boot_command_line[0])
+ strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
+ strlcat(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
+ }
+
+ if (BUILTIN_EXTEND_WITH_PROM && arcs_cmdline[0]) {
+ if (boot_command_line[0])
+ strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
+ strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
+ }
+#endif
+#endif
+ strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
+
+ *cmdline_p = command_line;
+
+ parse_early_param();
+
+ if (usermem) {
+ pr_info("User-defined physical RAM map:\n");
+ print_memory_map();
+ }
+
+ early_init_fdt_reserve_self();
+ early_init_fdt_scan_reserved_mem();
+
+ bootmem_init();
+#ifdef CONFIG_PROC_VMCORE
+ if (setup_elfcorehdr && setup_elfcorehdr_size) {
+ printk(KERN_INFO "kdump reserved memory at %lx-%lx\n",
+ setup_elfcorehdr, setup_elfcorehdr_size);
+ reserve_bootmem(setup_elfcorehdr, setup_elfcorehdr_size,
+ BOOTMEM_DEFAULT);
+ }
+#endif
+
+ mips_parse_crashkernel();
+#ifdef CONFIG_KEXEC
+ if (crashk_res.start != crashk_res.end)
+ reserve_bootmem(crashk_res.start,
+ crashk_res.end - crashk_res.start + 1,
+ BOOTMEM_DEFAULT);
+#endif
+ device_tree_init();
+ sparse_init();
+ plat_swiotlb_setup();
+
+ dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
+ /* Tell bootmem about cma reserved memblock section */
+ for_each_memblock(reserved, reg)
+ if (reg->size != 0)
+ reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
+
+ reserve_bootmem_region(__pa_symbol(&__nosave_begin),
+ __pa_symbol(&__nosave_end)); /* Reserve for hibernation */
+}
+
+static void __init resource_init(void)
+{
+ int i;
+
+ if (UNCAC_BASE != IO_BASE)
+ return;
+
+ code_resource.start = __pa_symbol(&_text);
+ code_resource.end = __pa_symbol(&_etext) - 1;
+ data_resource.start = __pa_symbol(&_etext);
+ data_resource.end = __pa_symbol(&_edata) - 1;
+ bss_resource.start = __pa_symbol(&__bss_start);
+ bss_resource.end = __pa_symbol(&__bss_stop) - 1;
+
+ for (i = 0; i < boot_mem_map.nr_map; i++) {
+ struct resource *res;
+ unsigned long start, end;
+
+ start = boot_mem_map.map[i].addr;
+ end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
+ if (start >= HIGHMEM_START)
+ continue;
+ if (end >= HIGHMEM_START)
+ end = HIGHMEM_START - 1;
+
+ res = alloc_bootmem(sizeof(struct resource));
+
+ res->start = start;
+ res->end = end;
+ res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
+
+ switch (boot_mem_map.map[i].type) {
+ case BOOT_MEM_RAM:
+ case BOOT_MEM_INIT_RAM:
+ case BOOT_MEM_ROM_DATA:
+ res->name = "System RAM";
+ res->flags |= IORESOURCE_SYSRAM;
+ break;
+ case BOOT_MEM_RESERVED:
+ default:
+ res->name = "reserved";
+ }
+
+ request_resource(&iomem_resource, res);
+
+ /*
+ * We don't know which RAM region contains kernel data,
+ * so we try it repeatedly and let the resource manager
+ * test it.
+ */
+ request_resource(res, &code_resource);
+ request_resource(res, &data_resource);
+ request_resource(res, &bss_resource);
+ request_crashkernel(res);
+ }
+}
+
+#ifdef CONFIG_SMP
+static void __init prefill_possible_map(void)
+{
+ int i, possible = num_possible_cpus();
+
+ if (possible > nr_cpu_ids)
+ possible = nr_cpu_ids;
+
+ for (i = 0; i < possible; i++)
+ set_cpu_possible(i, true);
+ for (; i < NR_CPUS; i++)
+ set_cpu_possible(i, false);
+
+ nr_cpu_ids = possible;
+}
+#else
+static inline void prefill_possible_map(void) {}
+#endif
+
+void __init setup_arch(char **cmdline_p)
+{
+ cpu_probe();
+ mips_cm_probe();
+ prom_init();
+
+ setup_early_fdc_console();
+#ifdef CONFIG_EARLY_PRINTK
+ setup_early_printk();
+#endif
+ cpu_report();
+ check_bugs_early();
+
+#if defined(CONFIG_VT)
+#if defined(CONFIG_VGA_CONSOLE)
+ conswitchp = &vga_con;
+#elif defined(CONFIG_DUMMY_CONSOLE)
+ conswitchp = &dummy_con;
+#endif
+#endif
+
+ arch_mem_init(cmdline_p);
+
+ resource_init();
+ plat_smp_setup();
+ prefill_possible_map();
+
+ cpu_cache_init();
+ paging_init();
+}
+
+unsigned long kernelsp[NR_CPUS];
+unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
+
+#ifdef CONFIG_USE_OF
+unsigned long fw_passed_dtb;
+#endif
+
+#ifdef CONFIG_DEBUG_FS
+struct dentry *mips_debugfs_dir;
+static int __init debugfs_mips(void)
+{
+ struct dentry *d;
+
+ d = debugfs_create_dir("mips", NULL);
+ if (!d)
+ return -ENOMEM;
+ mips_debugfs_dir = d;
+ return 0;
+}
+arch_initcall(debugfs_mips);
+#endif
+
+#if defined(CONFIG_DMA_MAYBE_COHERENT) && !defined(CONFIG_DMA_PERDEV_COHERENT)
+/* User defined DMA coherency from command line. */
+enum coherent_io_user_state coherentio = IO_COHERENCE_DEFAULT;
+EXPORT_SYMBOL_GPL(coherentio);
+int hw_coherentio = 0; /* Actual hardware supported DMA coherency setting. */
+
+static int __init setcoherentio(char *str)
+{
+ coherentio = IO_COHERENCE_ENABLED;
+ pr_info("Hardware DMA cache coherency (command line)\n");
+ return 0;
+}
+early_param("coherentio", setcoherentio);
+
+static int __init setnocoherentio(char *str)
+{
+ coherentio = IO_COHERENCE_DISABLED;
+ pr_info("Software DMA cache coherency (command line)\n");
+ return 0;
+}
+early_param("nocoherentio", setnocoherentio);
+#endif