2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
6 * Copyright (C) 1995 Linus Torvalds
7 * Copyright (C) 1995 Waldorf Electronics
8 * Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 01, 02, 03 Ralf Baechle
9 * Copyright (C) 1996 Stoned Elipot
10 * Copyright (C) 1999 Silicon Graphics, Inc.
11 * Copyright (C) 2000, 2001, 2002, 2007 Maciej W. Rozycki
13 #include <linux/init.h>
14 #include <linux/ioport.h>
15 #include <linux/export.h>
16 #include <linux/screen_info.h>
17 #include <linux/memblock.h>
18 #include <linux/bootmem.h>
19 #include <linux/initrd.h>
20 #include <linux/root_dev.h>
21 #include <linux/highmem.h>
22 #include <linux/console.h>
23 #include <linux/pfn.h>
24 #include <linux/debugfs.h>
25 #include <linux/kexec.h>
26 #include <linux/sizes.h>
27 #include <linux/device.h>
28 #include <linux/dma-contiguous.h>
29 #include <linux/decompress/generic.h>
30 #include <linux/of_fdt.h>
32 #include <asm/addrspace.h>
33 #include <asm/bootinfo.h>
35 #include <asm/cache.h>
38 #include <asm/debug.h>
39 #include <asm/sections.h>
40 #include <asm/setup.h>
41 #include <asm/smp-ops.h>
44 #ifdef CONFIG_MIPS_ELF_APPENDED_DTB
45 const char __section(.appended_dtb) __appended_dtb[0x100000];
46 #endif /* CONFIG_MIPS_ELF_APPENDED_DTB */
48 struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
50 EXPORT_SYMBOL(cpu_data);
53 struct screen_info screen_info;
59 * These are initialized so they are in the .data section
61 unsigned long mips_machtype __read_mostly = MACH_UNKNOWN;
63 EXPORT_SYMBOL(mips_machtype);
65 struct boot_mem_map boot_mem_map;
67 static char __initdata command_line[COMMAND_LINE_SIZE];
68 char __initdata arcs_cmdline[COMMAND_LINE_SIZE];
70 #ifdef CONFIG_CMDLINE_BOOL
71 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
75 * mips_io_port_base is the begin of the address space to which x86 style
76 * I/O ports are mapped.
78 unsigned long mips_io_port_base = -1;
79 EXPORT_SYMBOL(mips_io_port_base);
81 static struct resource code_resource = { .name = "Kernel code", };
82 static struct resource data_resource = { .name = "Kernel data", };
84 static void *detect_magic __initdata = detect_memory_region;
86 void __init add_memory_region(phys_addr_t start, phys_addr_t size, long type)
88 int x = boot_mem_map.nr_map;
92 * If the region reaches the top of the physical address space, adjust
93 * the size slightly so that (start + size) doesn't overflow
95 if (start + size - 1 == (phys_addr_t)ULLONG_MAX)
99 if (start + size < start) {
100 pr_warn("Trying to add an invalid memory region, skipped\n");
105 * Try to merge with existing entry, if any.
107 for (i = 0; i < boot_mem_map.nr_map; i++) {
108 struct boot_mem_map_entry *entry = boot_mem_map.map + i;
111 if (entry->type != type)
114 if (start + size < entry->addr)
115 continue; /* no overlap */
117 if (entry->addr + entry->size < start)
118 continue; /* no overlap */
120 top = max(entry->addr + entry->size, start + size);
121 entry->addr = min(entry->addr, start);
122 entry->size = top - entry->addr;
127 if (boot_mem_map.nr_map == BOOT_MEM_MAP_MAX) {
128 pr_err("Ooops! Too many entries in the memory map!\n");
132 boot_mem_map.map[x].addr = start;
133 boot_mem_map.map[x].size = size;
134 boot_mem_map.map[x].type = type;
135 boot_mem_map.nr_map++;
138 void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max)
140 void *dm = &detect_magic;
143 for (size = sz_min; size < sz_max; size <<= 1) {
144 if (!memcmp(dm, dm + size, sizeof(detect_magic)))
148 pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n",
149 ((unsigned long long) size) / SZ_1M,
150 (unsigned long long) start,
151 ((unsigned long long) sz_min) / SZ_1M,
152 ((unsigned long long) sz_max) / SZ_1M);
154 add_memory_region(start, size, BOOT_MEM_RAM);
157 bool __init memory_region_available(phys_addr_t start, phys_addr_t size)
160 bool in_ram = false, free = true;
162 for (i = 0; i < boot_mem_map.nr_map; i++) {
163 phys_addr_t start_, end_;
165 start_ = boot_mem_map.map[i].addr;
166 end_ = boot_mem_map.map[i].addr + boot_mem_map.map[i].size;
168 switch (boot_mem_map.map[i].type) {
170 if (start >= start_ && start + size <= end_)
173 case BOOT_MEM_RESERVED:
174 if ((start >= start_ && start < end_) ||
175 (start < start_ && start + size >= start_))
183 return in_ram && free;
186 static void __init print_memory_map(void)
189 const int field = 2 * sizeof(unsigned long);
191 for (i = 0; i < boot_mem_map.nr_map; i++) {
192 printk(KERN_INFO " memory: %0*Lx @ %0*Lx ",
193 field, (unsigned long long) boot_mem_map.map[i].size,
194 field, (unsigned long long) boot_mem_map.map[i].addr);
196 switch (boot_mem_map.map[i].type) {
198 printk(KERN_CONT "(usable)\n");
200 case BOOT_MEM_INIT_RAM:
201 printk(KERN_CONT "(usable after init)\n");
203 case BOOT_MEM_ROM_DATA:
204 printk(KERN_CONT "(ROM data)\n");
206 case BOOT_MEM_RESERVED:
207 printk(KERN_CONT "(reserved)\n");
210 printk(KERN_CONT "type %lu\n", boot_mem_map.map[i].type);
219 #ifdef CONFIG_BLK_DEV_INITRD
221 static int __init rd_start_early(char *p)
223 unsigned long start = memparse(p, &p);
226 /* Guess if the sign extension was forgotten by bootloader */
230 initrd_start = start;
234 early_param("rd_start", rd_start_early);
236 static int __init rd_size_early(char *p)
238 initrd_end += memparse(p, &p);
241 early_param("rd_size", rd_size_early);
243 /* it returns the next free pfn after initrd */
244 static unsigned long __init init_initrd(void)
249 * Board specific code or command line parser should have
250 * already set up initrd_start and initrd_end. In these cases
251 * perfom sanity checks and use them if all looks good.
253 if (!initrd_start || initrd_end <= initrd_start)
256 if (initrd_start & ~PAGE_MASK) {
257 pr_err("initrd start must be page aligned\n");
260 if (initrd_start < PAGE_OFFSET) {
261 pr_err("initrd start < PAGE_OFFSET\n");
266 * Sanitize initrd addresses. For example firmware
267 * can't guess if they need to pass them through
268 * 64-bits values if the kernel has been built in pure
269 * 32-bit. We need also to switch from KSEG0 to XKPHYS
270 * addresses now, so the code can now safely use __pa().
272 end = __pa(initrd_end);
273 initrd_end = (unsigned long)__va(end);
274 initrd_start = (unsigned long)__va(__pa(initrd_start));
276 ROOT_DEV = Root_RAM0;
284 /* In some conditions (e.g. big endian bootloader with a little endian
285 kernel), the initrd might appear byte swapped. Try to detect this and
286 byte swap it if needed. */
287 static void __init maybe_bswap_initrd(void)
289 #if defined(CONFIG_CPU_CAVIUM_OCTEON)
292 /* Check for CPIO signature */
293 if (!memcmp((void *)initrd_start, "070701", 6))
296 /* Check for compressed initrd */
297 if (decompress_method((unsigned char *)initrd_start, 8, NULL))
300 /* Try again with a byte swapped header */
301 buf = swab64p((u64 *)initrd_start);
302 if (!memcmp(&buf, "070701", 6) ||
303 decompress_method((unsigned char *)(&buf), 8, NULL)) {
306 pr_info("Byteswapped initrd detected\n");
307 for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8)
313 static void __init finalize_initrd(void)
315 unsigned long size = initrd_end - initrd_start;
318 printk(KERN_INFO "Initrd not found or empty");
321 if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
322 printk(KERN_ERR "Initrd extends beyond end of memory");
326 maybe_bswap_initrd();
328 reserve_bootmem(__pa(initrd_start), size, BOOTMEM_DEFAULT);
329 initrd_below_start_ok = 1;
331 pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
335 printk(KERN_CONT " - disabling initrd\n");
340 #else /* !CONFIG_BLK_DEV_INITRD */
342 static unsigned long __init init_initrd(void)
347 #define finalize_initrd() do {} while (0)
352 * Initialize the bootmem allocator. It also setup initrd related data
355 #if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON3) && defined(CONFIG_NUMA))
357 static void __init bootmem_init(void)
363 #else /* !CONFIG_SGI_IP27 */
365 static unsigned long __init bootmap_bytes(unsigned long pages)
367 unsigned long bytes = DIV_ROUND_UP(pages, 8);
369 return ALIGN(bytes, sizeof(long));
372 static void __init bootmem_init(void)
374 unsigned long reserved_end;
375 unsigned long mapstart = ~0UL;
376 unsigned long bootmap_size;
377 phys_addr_t ramstart = (phys_addr_t)ULLONG_MAX;
378 bool bootmap_valid = false;
382 * Sanity check any INITRD first. We don't take it into account
383 * for bootmem setup initially, rely on the end-of-kernel-code
384 * as our memory range starting point. Once bootmem is inited we
385 * will reserve the area used for the initrd.
388 reserved_end = (unsigned long) PFN_UP(__pa_symbol(&_end));
391 * max_low_pfn is not a number of pages. The number of pages
392 * of the system is given by 'max_low_pfn - min_low_pfn'.
398 * Find the highest page frame number we have available
399 * and the lowest used RAM address
401 for (i = 0; i < boot_mem_map.nr_map; i++) {
402 unsigned long start, end;
404 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
407 start = PFN_UP(boot_mem_map.map[i].addr);
408 end = PFN_DOWN(boot_mem_map.map[i].addr
409 + boot_mem_map.map[i].size);
411 ramstart = min(ramstart, boot_mem_map.map[i].addr);
413 #ifndef CONFIG_HIGHMEM
415 * Skip highmem here so we get an accurate max_low_pfn if low
416 * memory stops short of high memory.
417 * If the region overlaps HIGHMEM_START, end is clipped so
418 * max_pfn excludes the highmem portion.
420 if (start >= PFN_DOWN(HIGHMEM_START))
422 if (end > PFN_DOWN(HIGHMEM_START))
423 end = PFN_DOWN(HIGHMEM_START);
426 if (end > max_low_pfn)
428 if (start < min_low_pfn)
430 if (end <= reserved_end)
432 #ifdef CONFIG_BLK_DEV_INITRD
433 /* Skip zones before initrd and initrd itself */
434 if (initrd_end && end <= (unsigned long)PFN_UP(__pa(initrd_end)))
437 if (start >= mapstart)
439 mapstart = max(reserved_end, start);
443 * Reserve any memory between the start of RAM and PHYS_OFFSET
445 if (ramstart > PHYS_OFFSET)
446 add_memory_region(PHYS_OFFSET, ramstart - PHYS_OFFSET,
449 if (min_low_pfn >= max_low_pfn)
450 panic("Incorrect memory mapping !!!");
451 if (min_low_pfn > ARCH_PFN_OFFSET) {
452 pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
453 (min_low_pfn - ARCH_PFN_OFFSET) * sizeof(struct page),
454 min_low_pfn - ARCH_PFN_OFFSET);
455 } else if (min_low_pfn < ARCH_PFN_OFFSET) {
456 pr_info("%lu free pages won't be used\n",
457 ARCH_PFN_OFFSET - min_low_pfn);
459 min_low_pfn = ARCH_PFN_OFFSET;
462 * Determine low and high memory ranges
464 max_pfn = max_low_pfn;
465 if (max_low_pfn > PFN_DOWN(HIGHMEM_START)) {
466 #ifdef CONFIG_HIGHMEM
467 highstart_pfn = PFN_DOWN(HIGHMEM_START);
468 highend_pfn = max_low_pfn;
470 max_low_pfn = PFN_DOWN(HIGHMEM_START);
473 #ifdef CONFIG_BLK_DEV_INITRD
475 * mapstart should be after initrd_end
478 mapstart = max(mapstart, (unsigned long)PFN_UP(__pa(initrd_end)));
482 * check that mapstart doesn't overlap with any of
483 * memory regions that have been reserved through eg. DTB
485 bootmap_size = bootmap_bytes(max_low_pfn - min_low_pfn);
487 bootmap_valid = memory_region_available(PFN_PHYS(mapstart),
489 for (i = 0; i < boot_mem_map.nr_map && !bootmap_valid; i++) {
490 unsigned long mapstart_addr;
492 switch (boot_mem_map.map[i].type) {
493 case BOOT_MEM_RESERVED:
494 mapstart_addr = PFN_ALIGN(boot_mem_map.map[i].addr +
495 boot_mem_map.map[i].size);
496 if (PHYS_PFN(mapstart_addr) < mapstart)
499 bootmap_valid = memory_region_available(mapstart_addr,
502 mapstart = PHYS_PFN(mapstart_addr);
510 panic("No memory area to place a bootmap bitmap");
513 * Initialize the boot-time allocator with low memory only.
515 if (bootmap_size != init_bootmem_node(NODE_DATA(0), mapstart,
516 min_low_pfn, max_low_pfn))
517 panic("Unexpected memory size required for bootmap");
519 for (i = 0; i < boot_mem_map.nr_map; i++) {
520 unsigned long start, end;
522 start = PFN_UP(boot_mem_map.map[i].addr);
523 end = PFN_DOWN(boot_mem_map.map[i].addr
524 + boot_mem_map.map[i].size);
526 if (start <= min_low_pfn)
531 #ifndef CONFIG_HIGHMEM
532 if (end > max_low_pfn)
536 * ... finally, is the area going away?
542 memblock_add_node(PFN_PHYS(start), PFN_PHYS(end - start), 0);
546 * Register fully available low RAM pages with the bootmem allocator.
548 for (i = 0; i < boot_mem_map.nr_map; i++) {
549 unsigned long start, end, size;
551 start = PFN_UP(boot_mem_map.map[i].addr);
552 end = PFN_DOWN(boot_mem_map.map[i].addr
553 + boot_mem_map.map[i].size);
556 * Reserve usable memory.
558 switch (boot_mem_map.map[i].type) {
561 case BOOT_MEM_INIT_RAM:
562 memory_present(0, start, end);
565 /* Not usable memory */
566 if (start > min_low_pfn && end < max_low_pfn)
567 reserve_bootmem(boot_mem_map.map[i].addr,
568 boot_mem_map.map[i].size,
574 * We are rounding up the start address of usable memory
575 * and at the end of the usable range downwards.
577 if (start >= max_low_pfn)
579 if (start < reserved_end)
580 start = reserved_end;
581 if (end > max_low_pfn)
585 * ... finally, is the area going away?
591 /* Register lowmem ranges */
592 free_bootmem(PFN_PHYS(start), size << PAGE_SHIFT);
593 memory_present(0, start, end);
597 * Reserve the bootmap memory.
599 reserve_bootmem(PFN_PHYS(mapstart), bootmap_size, BOOTMEM_DEFAULT);
601 #ifdef CONFIG_RELOCATABLE
603 * The kernel reserves all memory below its _end symbol as bootmem,
604 * but the kernel may now be at a much higher address. The memory
605 * between the original and new locations may be returned to the system.
607 if (__pa_symbol(_text) > __pa_symbol(VMLINUX_LOAD_ADDRESS)) {
608 unsigned long offset;
609 extern void show_kernel_relocation(const char *level);
611 offset = __pa_symbol(_text) - __pa_symbol(VMLINUX_LOAD_ADDRESS);
612 free_bootmem(__pa_symbol(VMLINUX_LOAD_ADDRESS), offset);
614 #if defined(CONFIG_DEBUG_KERNEL) && defined(CONFIG_DEBUG_INFO)
616 * This information is necessary when debugging the kernel
617 * But is a security vulnerability otherwise!
619 show_kernel_relocation(KERN_INFO);
625 * Reserve initrd memory if needed.
630 #endif /* CONFIG_SGI_IP27 */
633 * arch_mem_init - initialize memory management subsystem
635 * o plat_mem_setup() detects the memory configuration and will record detected
636 * memory areas using add_memory_region.
638 * At this stage the memory configuration of the system is known to the
639 * kernel but generic memory management system is still entirely uninitialized.
644 * o dma_contiguous_reserve()
646 * At this stage the bootmem allocator is ready to use.
648 * NOTE: historically plat_mem_setup did the entire platform initialization.
649 * This was rather impractical because it meant plat_mem_setup had to
650 * get away without any kind of memory allocator. To keep old code from
651 * breaking plat_setup was just renamed to plat_mem_setup and a second platform
652 * initialization hook for anything else was introduced.
655 static int usermem __initdata;
657 static int __init early_parse_mem(char *p)
659 phys_addr_t start, size;
662 * If a user specifies memory size, we
663 * blow away any automatically generated
667 boot_mem_map.nr_map = 0;
671 size = memparse(p, &p);
673 start = memparse(p + 1, &p);
675 add_memory_region(start, size, BOOT_MEM_RAM);
679 early_param("mem", early_parse_mem);
681 static int __init early_parse_memmap(char *p)
684 u64 start_at, mem_size;
689 if (!strncmp(p, "exactmap", 8)) {
690 pr_err("\"memmap=exactmap\" invalid on MIPS\n");
695 mem_size = memparse(p, &p);
700 start_at = memparse(p+1, &p);
701 add_memory_region(start_at, mem_size, BOOT_MEM_RAM);
702 } else if (*p == '#') {
703 pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on MIPS\n");
705 } else if (*p == '$') {
706 start_at = memparse(p+1, &p);
707 add_memory_region(start_at, mem_size, BOOT_MEM_RESERVED);
709 pr_err("\"memmap\" invalid format!\n");
719 early_param("memmap", early_parse_memmap);
721 #ifdef CONFIG_PROC_VMCORE
722 unsigned long setup_elfcorehdr, setup_elfcorehdr_size;
723 static int __init early_parse_elfcorehdr(char *p)
727 setup_elfcorehdr = memparse(p, &p);
729 for (i = 0; i < boot_mem_map.nr_map; i++) {
730 unsigned long start = boot_mem_map.map[i].addr;
731 unsigned long end = (boot_mem_map.map[i].addr +
732 boot_mem_map.map[i].size);
733 if (setup_elfcorehdr >= start && setup_elfcorehdr < end) {
735 * Reserve from the elf core header to the end of
736 * the memory segment, that should all be kdump
739 setup_elfcorehdr_size = end - setup_elfcorehdr;
744 * If we don't find it in the memory map, then we shouldn't
745 * have to worry about it, as the new kernel won't use it.
749 early_param("elfcorehdr", early_parse_elfcorehdr);
752 static void __init arch_mem_addpart(phys_addr_t mem, phys_addr_t end, int type)
761 /* Make sure it is in the boot_mem_map */
762 for (i = 0; i < boot_mem_map.nr_map; i++) {
763 if (mem >= boot_mem_map.map[i].addr &&
764 mem < (boot_mem_map.map[i].addr +
765 boot_mem_map.map[i].size))
768 add_memory_region(mem, size, type);
772 static inline unsigned long long get_total_mem(void)
774 unsigned long long total;
776 total = max_pfn - min_low_pfn;
777 return total << PAGE_SHIFT;
780 static void __init mips_parse_crashkernel(void)
782 unsigned long long total_mem;
783 unsigned long long crash_size, crash_base;
786 total_mem = get_total_mem();
787 ret = parse_crashkernel(boot_command_line, total_mem,
788 &crash_size, &crash_base);
789 if (ret != 0 || crash_size <= 0)
792 if (!memory_region_available(crash_base, crash_size)) {
793 pr_warn("Invalid memory region reserved for crash kernel\n");
797 crashk_res.start = crash_base;
798 crashk_res.end = crash_base + crash_size - 1;
801 static void __init request_crashkernel(struct resource *res)
805 if (crashk_res.start == crashk_res.end)
808 ret = request_resource(res, &crashk_res);
810 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
811 (unsigned long)((crashk_res.end -
812 crashk_res.start + 1) >> 20),
813 (unsigned long)(crashk_res.start >> 20));
815 #else /* !defined(CONFIG_KEXEC) */
816 static void __init mips_parse_crashkernel(void)
820 static void __init request_crashkernel(struct resource *res)
823 #endif /* !defined(CONFIG_KEXEC) */
825 #define USE_PROM_CMDLINE IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_BOOTLOADER)
826 #define USE_DTB_CMDLINE IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB)
827 #define EXTEND_WITH_PROM IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND)
828 #define BUILTIN_EXTEND_WITH_PROM \
829 IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND)
831 static void __init arch_mem_init(char **cmdline_p)
833 struct memblock_region *reg;
834 extern void plat_mem_setup(void);
836 /* call board setup routine */
840 * Make sure all kernel memory is in the maps. The "UP" and
841 * "DOWN" are opposite for initdata since if it crosses over
842 * into another memory section you don't want that to be
843 * freed when the initdata is freed.
845 arch_mem_addpart(PFN_DOWN(__pa_symbol(&_text)) << PAGE_SHIFT,
846 PFN_UP(__pa_symbol(&_edata)) << PAGE_SHIFT,
848 arch_mem_addpart(PFN_UP(__pa_symbol(&__init_begin)) << PAGE_SHIFT,
849 PFN_DOWN(__pa_symbol(&__init_end)) << PAGE_SHIFT,
852 pr_info("Determined physical RAM map:\n");
855 #if defined(CONFIG_CMDLINE_BOOL) && defined(CONFIG_CMDLINE_OVERRIDE)
856 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
858 if ((USE_PROM_CMDLINE && arcs_cmdline[0]) ||
859 (USE_DTB_CMDLINE && !boot_command_line[0]))
860 strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
862 if (EXTEND_WITH_PROM && arcs_cmdline[0]) {
863 if (boot_command_line[0])
864 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
865 strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
868 #if defined(CONFIG_CMDLINE_BOOL)
869 if (builtin_cmdline[0]) {
870 if (boot_command_line[0])
871 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
872 strlcat(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
875 if (BUILTIN_EXTEND_WITH_PROM && arcs_cmdline[0]) {
876 if (boot_command_line[0])
877 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
878 strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
882 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
884 *cmdline_p = command_line;
889 pr_info("User-defined physical RAM map:\n");
893 early_init_fdt_reserve_self();
894 early_init_fdt_scan_reserved_mem();
897 #ifdef CONFIG_PROC_VMCORE
898 if (setup_elfcorehdr && setup_elfcorehdr_size) {
899 printk(KERN_INFO "kdump reserved memory at %lx-%lx\n",
900 setup_elfcorehdr, setup_elfcorehdr_size);
901 reserve_bootmem(setup_elfcorehdr, setup_elfcorehdr_size,
906 mips_parse_crashkernel();
908 if (crashk_res.start != crashk_res.end)
909 reserve_bootmem(crashk_res.start,
910 crashk_res.end - crashk_res.start + 1,
916 * In order to reduce the possibility of kernel panic when failed to
917 * get IO TLB memory under CONFIG_SWIOTLB, it is better to allocate
918 * low memory as small as possible before plat_swiotlb_setup(), so
919 * make sparse_init() using top-down allocation.
921 memblock_set_bottom_up(false);
923 memblock_set_bottom_up(true);
925 plat_swiotlb_setup();
927 dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
928 /* Tell bootmem about cma reserved memblock section */
929 for_each_memblock(reserved, reg)
931 reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
933 reserve_bootmem_region(__pa_symbol(&__nosave_begin),
934 __pa_symbol(&__nosave_end)); /* Reserve for hibernation */
937 static void __init resource_init(void)
941 if (UNCAC_BASE != IO_BASE)
944 code_resource.start = __pa_symbol(&_text);
945 code_resource.end = __pa_symbol(&_etext) - 1;
946 data_resource.start = __pa_symbol(&_etext);
947 data_resource.end = __pa_symbol(&_edata) - 1;
949 for (i = 0; i < boot_mem_map.nr_map; i++) {
950 struct resource *res;
951 unsigned long start, end;
953 start = boot_mem_map.map[i].addr;
954 end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
955 if (start >= HIGHMEM_START)
957 if (end >= HIGHMEM_START)
958 end = HIGHMEM_START - 1;
960 res = alloc_bootmem(sizeof(struct resource));
964 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
966 switch (boot_mem_map.map[i].type) {
968 case BOOT_MEM_INIT_RAM:
969 case BOOT_MEM_ROM_DATA:
970 res->name = "System RAM";
971 res->flags |= IORESOURCE_SYSRAM;
973 case BOOT_MEM_RESERVED:
975 res->name = "reserved";
978 request_resource(&iomem_resource, res);
981 * We don't know which RAM region contains kernel data,
982 * so we try it repeatedly and let the resource manager
985 request_resource(res, &code_resource);
986 request_resource(res, &data_resource);
987 request_crashkernel(res);
992 static void __init prefill_possible_map(void)
994 int i, possible = num_possible_cpus();
996 if (possible > nr_cpu_ids)
997 possible = nr_cpu_ids;
999 for (i = 0; i < possible; i++)
1000 set_cpu_possible(i, true);
1001 for (; i < NR_CPUS; i++)
1002 set_cpu_possible(i, false);
1004 nr_cpu_ids = possible;
1007 static inline void prefill_possible_map(void) {}
1010 void __init setup_arch(char **cmdline_p)
1016 setup_early_fdc_console();
1017 #ifdef CONFIG_EARLY_PRINTK
1018 setup_early_printk();
1023 #if defined(CONFIG_VT)
1024 #if defined(CONFIG_VGA_CONSOLE)
1025 conswitchp = &vga_con;
1026 #elif defined(CONFIG_DUMMY_CONSOLE)
1027 conswitchp = &dummy_con;
1031 arch_mem_init(cmdline_p);
1035 prefill_possible_map();
1041 unsigned long kernelsp[NR_CPUS];
1042 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
1044 #ifdef CONFIG_USE_OF
1045 unsigned long fw_passed_dtb;
1048 #ifdef CONFIG_DEBUG_FS
1049 struct dentry *mips_debugfs_dir;
1050 static int __init debugfs_mips(void)
1054 d = debugfs_create_dir("mips", NULL);
1057 mips_debugfs_dir = d;
1060 arch_initcall(debugfs_mips);