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/initrd.h>
19 #include <linux/root_dev.h>
20 #include <linux/highmem.h>
21 #include <linux/console.h>
22 #include <linux/pfn.h>
23 #include <linux/debugfs.h>
24 #include <linux/kexec.h>
25 #include <linux/sizes.h>
26 #include <linux/device.h>
27 #include <linux/dma-contiguous.h>
28 #include <linux/decompress/generic.h>
29 #include <linux/of_fdt.h>
30 #include <linux/of_reserved_mem.h>
32 #include <asm/addrspace.h>
33 #include <asm/bootinfo.h>
35 #include <asm/cache.h>
38 #include <asm/debug.h>
39 #include <asm/dma-coherence.h>
40 #include <asm/sections.h>
41 #include <asm/setup.h>
42 #include <asm/smp-ops.h>
45 #ifdef CONFIG_MIPS_ELF_APPENDED_DTB
46 const char __section(.appended_dtb) __appended_dtb[0x100000];
47 #endif /* CONFIG_MIPS_ELF_APPENDED_DTB */
49 struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
51 EXPORT_SYMBOL(cpu_data);
54 struct screen_info screen_info;
60 * These are initialized so they are in the .data section
62 unsigned long mips_machtype __read_mostly = MACH_UNKNOWN;
64 EXPORT_SYMBOL(mips_machtype);
66 struct boot_mem_map boot_mem_map;
68 static char __initdata command_line[COMMAND_LINE_SIZE];
69 char __initdata arcs_cmdline[COMMAND_LINE_SIZE];
71 #ifdef CONFIG_CMDLINE_BOOL
72 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
76 * mips_io_port_base is the begin of the address space to which x86 style
77 * I/O ports are mapped.
79 const unsigned long mips_io_port_base = -1;
80 EXPORT_SYMBOL(mips_io_port_base);
82 static struct resource code_resource = { .name = "Kernel code", };
83 static struct resource data_resource = { .name = "Kernel data", };
84 static struct resource bss_resource = { .name = "Kernel bss", };
86 static void *detect_magic __initdata = detect_memory_region;
88 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
89 unsigned long ARCH_PFN_OFFSET;
90 EXPORT_SYMBOL(ARCH_PFN_OFFSET);
93 void __init add_memory_region(phys_addr_t start, phys_addr_t size, long type)
95 int x = boot_mem_map.nr_map;
99 * If the region reaches the top of the physical address space, adjust
100 * the size slightly so that (start + size) doesn't overflow
102 if (start + size - 1 == PHYS_ADDR_MAX)
106 if (start + size < start) {
107 pr_warn("Trying to add an invalid memory region, skipped\n");
112 * Try to merge with existing entry, if any.
114 for (i = 0; i < boot_mem_map.nr_map; i++) {
115 struct boot_mem_map_entry *entry = boot_mem_map.map + i;
118 if (entry->type != type)
121 if (start + size < entry->addr)
122 continue; /* no overlap */
124 if (entry->addr + entry->size < start)
125 continue; /* no overlap */
127 top = max(entry->addr + entry->size, start + size);
128 entry->addr = min(entry->addr, start);
129 entry->size = top - entry->addr;
134 if (boot_mem_map.nr_map == BOOT_MEM_MAP_MAX) {
135 pr_err("Ooops! Too many entries in the memory map!\n");
139 boot_mem_map.map[x].addr = start;
140 boot_mem_map.map[x].size = size;
141 boot_mem_map.map[x].type = type;
142 boot_mem_map.nr_map++;
145 void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max)
147 void *dm = &detect_magic;
150 for (size = sz_min; size < sz_max; size <<= 1) {
151 if (!memcmp(dm, dm + size, sizeof(detect_magic)))
155 pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n",
156 ((unsigned long long) size) / SZ_1M,
157 (unsigned long long) start,
158 ((unsigned long long) sz_min) / SZ_1M,
159 ((unsigned long long) sz_max) / SZ_1M);
161 add_memory_region(start, size, BOOT_MEM_RAM);
164 static bool __init __maybe_unused memory_region_available(phys_addr_t start,
168 bool in_ram = false, free = true;
170 for (i = 0; i < boot_mem_map.nr_map; i++) {
171 phys_addr_t start_, end_;
173 start_ = boot_mem_map.map[i].addr;
174 end_ = boot_mem_map.map[i].addr + boot_mem_map.map[i].size;
176 switch (boot_mem_map.map[i].type) {
178 if (start >= start_ && start + size <= end_)
181 case BOOT_MEM_RESERVED:
183 if ((start >= start_ && start < end_) ||
184 (start < start_ && start + size >= start_))
192 return in_ram && free;
195 static void __init print_memory_map(void)
198 const int field = 2 * sizeof(unsigned long);
200 for (i = 0; i < boot_mem_map.nr_map; i++) {
201 printk(KERN_INFO " memory: %0*Lx @ %0*Lx ",
202 field, (unsigned long long) boot_mem_map.map[i].size,
203 field, (unsigned long long) boot_mem_map.map[i].addr);
205 switch (boot_mem_map.map[i].type) {
207 printk(KERN_CONT "(usable)\n");
209 case BOOT_MEM_INIT_RAM:
210 printk(KERN_CONT "(usable after init)\n");
212 case BOOT_MEM_ROM_DATA:
213 printk(KERN_CONT "(ROM data)\n");
215 case BOOT_MEM_RESERVED:
216 printk(KERN_CONT "(reserved)\n");
219 printk(KERN_CONT "(nomap)\n");
222 printk(KERN_CONT "type %lu\n", boot_mem_map.map[i].type);
231 #ifdef CONFIG_BLK_DEV_INITRD
233 static int __init rd_start_early(char *p)
235 unsigned long start = memparse(p, &p);
238 /* Guess if the sign extension was forgotten by bootloader */
242 initrd_start = start;
246 early_param("rd_start", rd_start_early);
248 static int __init rd_size_early(char *p)
250 initrd_end += memparse(p, &p);
253 early_param("rd_size", rd_size_early);
255 /* it returns the next free pfn after initrd */
256 static unsigned long __init init_initrd(void)
261 * Board specific code or command line parser should have
262 * already set up initrd_start and initrd_end. In these cases
263 * perfom sanity checks and use them if all looks good.
265 if (!initrd_start || initrd_end <= initrd_start)
268 if (initrd_start & ~PAGE_MASK) {
269 pr_err("initrd start must be page aligned\n");
272 if (initrd_start < PAGE_OFFSET) {
273 pr_err("initrd start < PAGE_OFFSET\n");
278 * Sanitize initrd addresses. For example firmware
279 * can't guess if they need to pass them through
280 * 64-bits values if the kernel has been built in pure
281 * 32-bit. We need also to switch from KSEG0 to XKPHYS
282 * addresses now, so the code can now safely use __pa().
284 end = __pa(initrd_end);
285 initrd_end = (unsigned long)__va(end);
286 initrd_start = (unsigned long)__va(__pa(initrd_start));
288 ROOT_DEV = Root_RAM0;
296 /* In some conditions (e.g. big endian bootloader with a little endian
297 kernel), the initrd might appear byte swapped. Try to detect this and
298 byte swap it if needed. */
299 static void __init maybe_bswap_initrd(void)
301 #if defined(CONFIG_CPU_CAVIUM_OCTEON)
304 /* Check for CPIO signature */
305 if (!memcmp((void *)initrd_start, "070701", 6))
308 /* Check for compressed initrd */
309 if (decompress_method((unsigned char *)initrd_start, 8, NULL))
312 /* Try again with a byte swapped header */
313 buf = swab64p((u64 *)initrd_start);
314 if (!memcmp(&buf, "070701", 6) ||
315 decompress_method((unsigned char *)(&buf), 8, NULL)) {
318 pr_info("Byteswapped initrd detected\n");
319 for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8)
325 static void __init finalize_initrd(void)
327 unsigned long size = initrd_end - initrd_start;
330 printk(KERN_INFO "Initrd not found or empty");
333 if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
334 printk(KERN_ERR "Initrd extends beyond end of memory");
338 maybe_bswap_initrd();
340 memblock_reserve(__pa(initrd_start), size);
341 initrd_below_start_ok = 1;
343 pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
347 printk(KERN_CONT " - disabling initrd\n");
352 #else /* !CONFIG_BLK_DEV_INITRD */
354 static unsigned long __init init_initrd(void)
359 #define finalize_initrd() do {} while (0)
364 * Initialize the bootmem allocator. It also setup initrd related data
367 #if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON3) && defined(CONFIG_NUMA))
369 static void __init bootmem_init(void)
375 #else /* !CONFIG_SGI_IP27 */
377 static void __init bootmem_init(void)
379 phys_addr_t ramstart = PHYS_ADDR_MAX;
383 * Sanity check any INITRD first. We don't take it into account
384 * for bootmem setup initially, rely on the end-of-kernel-code
385 * as our memory range starting point. Once bootmem is inited we
386 * will reserve the area used for the initrd.
390 /* Reserve memory occupied by kernel. */
391 memblock_reserve(__pa_symbol(&_text),
392 __pa_symbol(&_end) - __pa_symbol(&_text));
395 * max_low_pfn is not a number of pages. The number of pages
396 * of the system is given by 'max_low_pfn - min_low_pfn'.
401 /* Find the highest and lowest page frame numbers we have available. */
402 for (i = 0; i < boot_mem_map.nr_map; i++) {
403 unsigned long start, end;
405 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
408 start = PFN_UP(boot_mem_map.map[i].addr);
409 end = PFN_DOWN(boot_mem_map.map[i].addr
410 + boot_mem_map.map[i].size);
412 ramstart = min(ramstart, boot_mem_map.map[i].addr);
414 #ifndef CONFIG_HIGHMEM
416 * Skip highmem here so we get an accurate max_low_pfn if low
417 * memory stops short of high memory.
418 * If the region overlaps HIGHMEM_START, end is clipped so
419 * max_pfn excludes the highmem portion.
421 if (start >= PFN_DOWN(HIGHMEM_START))
423 if (end > PFN_DOWN(HIGHMEM_START))
424 end = PFN_DOWN(HIGHMEM_START);
427 if (end > max_low_pfn)
429 if (start < min_low_pfn)
433 if (min_low_pfn >= max_low_pfn)
434 panic("Incorrect memory mapping !!!");
436 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
437 ARCH_PFN_OFFSET = PFN_UP(ramstart);
440 * Reserve any memory between the start of RAM and PHYS_OFFSET
442 if (ramstart > PHYS_OFFSET) {
443 add_memory_region(PHYS_OFFSET, ramstart - PHYS_OFFSET,
445 memblock_reserve(PHYS_OFFSET, ramstart - PHYS_OFFSET);
448 if (min_low_pfn > ARCH_PFN_OFFSET) {
449 pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
450 (min_low_pfn - ARCH_PFN_OFFSET) * sizeof(struct page),
451 min_low_pfn - ARCH_PFN_OFFSET);
452 } else if (ARCH_PFN_OFFSET - min_low_pfn > 0UL) {
453 pr_info("%lu free pages won't be used\n",
454 ARCH_PFN_OFFSET - min_low_pfn);
456 min_low_pfn = ARCH_PFN_OFFSET;
460 * Determine low and high memory ranges
462 max_pfn = max_low_pfn;
463 if (max_low_pfn > PFN_DOWN(HIGHMEM_START)) {
464 #ifdef CONFIG_HIGHMEM
465 highstart_pfn = PFN_DOWN(HIGHMEM_START);
466 highend_pfn = max_low_pfn;
468 max_low_pfn = PFN_DOWN(HIGHMEM_START);
471 /* Install all valid RAM ranges to the memblock memory region */
472 for (i = 0; i < boot_mem_map.nr_map; i++) {
473 unsigned long start, end;
475 start = PFN_UP(boot_mem_map.map[i].addr);
476 end = PFN_DOWN(boot_mem_map.map[i].addr
477 + boot_mem_map.map[i].size);
479 if (start < min_low_pfn)
481 #ifndef CONFIG_HIGHMEM
482 /* Ignore highmem regions if highmem is unsupported */
483 if (end > max_low_pfn)
489 memblock_add_node(PFN_PHYS(start), PFN_PHYS(end - start), 0);
491 /* Reserve any memory except the ordinary RAM ranges. */
492 switch (boot_mem_map.map[i].type) {
495 case BOOT_MEM_NOMAP: /* Discard the range from the system. */
496 memblock_remove(PFN_PHYS(start), PFN_PHYS(end - start));
498 default: /* Reserve the rest of the memory types at boot time */
499 memblock_reserve(PFN_PHYS(start), PFN_PHYS(end - start));
504 * In any case the added to the memblock memory regions
505 * (highmem/lowmem, available/reserved, etc) are considered
506 * as present, so inform sparsemem about them.
508 memory_present(0, start, end);
512 * Reserve initrd memory if needed.
517 #endif /* CONFIG_SGI_IP27 */
519 static int usermem __initdata;
521 static int __init early_parse_mem(char *p)
523 phys_addr_t start, size;
526 * If a user specifies memory size, we
527 * blow away any automatically generated
531 boot_mem_map.nr_map = 0;
535 size = memparse(p, &p);
537 start = memparse(p + 1, &p);
539 add_memory_region(start, size, BOOT_MEM_RAM);
543 early_param("mem", early_parse_mem);
545 static int __init early_parse_memmap(char *p)
548 u64 start_at, mem_size;
553 if (!strncmp(p, "exactmap", 8)) {
554 pr_err("\"memmap=exactmap\" invalid on MIPS\n");
559 mem_size = memparse(p, &p);
564 start_at = memparse(p+1, &p);
565 add_memory_region(start_at, mem_size, BOOT_MEM_RAM);
566 } else if (*p == '#') {
567 pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on MIPS\n");
569 } else if (*p == '$') {
570 start_at = memparse(p+1, &p);
571 add_memory_region(start_at, mem_size, BOOT_MEM_RESERVED);
573 pr_err("\"memmap\" invalid format!\n");
583 early_param("memmap", early_parse_memmap);
585 #ifdef CONFIG_PROC_VMCORE
586 unsigned long setup_elfcorehdr, setup_elfcorehdr_size;
587 static int __init early_parse_elfcorehdr(char *p)
591 setup_elfcorehdr = memparse(p, &p);
593 for (i = 0; i < boot_mem_map.nr_map; i++) {
594 unsigned long start = boot_mem_map.map[i].addr;
595 unsigned long end = (boot_mem_map.map[i].addr +
596 boot_mem_map.map[i].size);
597 if (setup_elfcorehdr >= start && setup_elfcorehdr < end) {
599 * Reserve from the elf core header to the end of
600 * the memory segment, that should all be kdump
603 setup_elfcorehdr_size = end - setup_elfcorehdr;
608 * If we don't find it in the memory map, then we shouldn't
609 * have to worry about it, as the new kernel won't use it.
613 early_param("elfcorehdr", early_parse_elfcorehdr);
616 static void __init arch_mem_addpart(phys_addr_t mem, phys_addr_t end, int type)
625 /* Make sure it is in the boot_mem_map */
626 for (i = 0; i < boot_mem_map.nr_map; i++) {
627 if (mem >= boot_mem_map.map[i].addr &&
628 mem < (boot_mem_map.map[i].addr +
629 boot_mem_map.map[i].size))
632 add_memory_region(mem, size, type);
636 static inline unsigned long long get_total_mem(void)
638 unsigned long long total;
640 total = max_pfn - min_low_pfn;
641 return total << PAGE_SHIFT;
644 static void __init mips_parse_crashkernel(void)
646 unsigned long long total_mem;
647 unsigned long long crash_size, crash_base;
650 total_mem = get_total_mem();
651 ret = parse_crashkernel(boot_command_line, total_mem,
652 &crash_size, &crash_base);
653 if (ret != 0 || crash_size <= 0)
656 if (!memory_region_available(crash_base, crash_size)) {
657 pr_warn("Invalid memory region reserved for crash kernel\n");
661 crashk_res.start = crash_base;
662 crashk_res.end = crash_base + crash_size - 1;
665 static void __init request_crashkernel(struct resource *res)
669 if (crashk_res.start == crashk_res.end)
672 ret = request_resource(res, &crashk_res);
674 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
675 (unsigned long)((crashk_res.end -
676 crashk_res.start + 1) >> 20),
677 (unsigned long)(crashk_res.start >> 20));
679 #else /* !defined(CONFIG_KEXEC) */
680 static void __init mips_parse_crashkernel(void)
684 static void __init request_crashkernel(struct resource *res)
687 #endif /* !defined(CONFIG_KEXEC) */
689 #define USE_PROM_CMDLINE IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_BOOTLOADER)
690 #define USE_DTB_CMDLINE IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB)
691 #define EXTEND_WITH_PROM IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND)
692 #define BUILTIN_EXTEND_WITH_PROM \
693 IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND)
696 * arch_mem_init - initialize memory management subsystem
698 * o plat_mem_setup() detects the memory configuration and will record detected
699 * memory areas using add_memory_region.
701 * At this stage the memory configuration of the system is known to the
702 * kernel but generic memory management system is still entirely uninitialized.
707 * o dma_contiguous_reserve()
709 * At this stage the bootmem allocator is ready to use.
711 * NOTE: historically plat_mem_setup did the entire platform initialization.
712 * This was rather impractical because it meant plat_mem_setup had to
713 * get away without any kind of memory allocator. To keep old code from
714 * breaking plat_setup was just renamed to plat_mem_setup and a second platform
715 * initialization hook for anything else was introduced.
717 static void __init arch_mem_init(char **cmdline_p)
719 extern void plat_mem_setup(void);
722 * Initialize boot_command_line to an innocuous but non-empty string in
723 * order to prevent early_init_dt_scan_chosen() from copying
724 * CONFIG_CMDLINE into it without our knowledge. We handle
725 * CONFIG_CMDLINE ourselves below & don't want to duplicate its
726 * content because repeating arguments can be problematic.
728 strlcpy(boot_command_line, " ", COMMAND_LINE_SIZE);
730 /* call board setup routine */
732 memblock_set_bottom_up(true);
735 * Make sure all kernel memory is in the maps. The "UP" and
736 * "DOWN" are opposite for initdata since if it crosses over
737 * into another memory section you don't want that to be
738 * freed when the initdata is freed.
740 arch_mem_addpart(PFN_DOWN(__pa_symbol(&_text)) << PAGE_SHIFT,
741 PFN_UP(__pa_symbol(&_edata)) << PAGE_SHIFT,
743 arch_mem_addpart(PFN_UP(__pa_symbol(&__init_begin)) << PAGE_SHIFT,
744 PFN_DOWN(__pa_symbol(&__init_end)) << PAGE_SHIFT,
746 arch_mem_addpart(PFN_DOWN(__pa_symbol(&__bss_start)) << PAGE_SHIFT,
747 PFN_UP(__pa_symbol(&__bss_stop)) << PAGE_SHIFT,
750 pr_info("Determined physical RAM map:\n");
753 #if defined(CONFIG_CMDLINE_BOOL) && defined(CONFIG_CMDLINE_OVERRIDE)
754 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
756 if ((USE_PROM_CMDLINE && arcs_cmdline[0]) ||
757 (USE_DTB_CMDLINE && !boot_command_line[0]))
758 strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
760 if (EXTEND_WITH_PROM && arcs_cmdline[0]) {
761 if (boot_command_line[0])
762 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
763 strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
766 #if defined(CONFIG_CMDLINE_BOOL)
767 if (builtin_cmdline[0]) {
768 if (boot_command_line[0])
769 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
770 strlcat(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
773 if (BUILTIN_EXTEND_WITH_PROM && arcs_cmdline[0]) {
774 if (boot_command_line[0])
775 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
776 strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
780 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
782 *cmdline_p = command_line;
787 pr_info("User-defined physical RAM map:\n");
791 early_init_fdt_reserve_self();
792 early_init_fdt_scan_reserved_mem();
797 * Prevent memblock from allocating high memory.
798 * This cannot be done before max_low_pfn is detected, so up
799 * to this point is possible to only reserve physical memory
800 * with memblock_reserve; memblock_alloc* can be used
801 * only after this point
803 memblock_set_current_limit(PFN_PHYS(max_low_pfn));
805 #ifdef CONFIG_PROC_VMCORE
806 if (setup_elfcorehdr && setup_elfcorehdr_size) {
807 printk(KERN_INFO "kdump reserved memory at %lx-%lx\n",
808 setup_elfcorehdr, setup_elfcorehdr_size);
809 memblock_reserve(setup_elfcorehdr, setup_elfcorehdr_size);
813 mips_parse_crashkernel();
815 if (crashk_res.start != crashk_res.end)
816 memblock_reserve(crashk_res.start,
817 crashk_res.end - crashk_res.start + 1);
821 plat_swiotlb_setup();
823 dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
825 /* Reserve for hibernation. */
826 memblock_reserve(__pa_symbol(&__nosave_begin),
827 __pa_symbol(&__nosave_end) - __pa_symbol(&__nosave_begin));
829 fdt_init_reserved_mem();
833 early_memtest(PFN_PHYS(min_low_pfn), PFN_PHYS(max_low_pfn));
836 static void __init resource_init(void)
840 if (UNCAC_BASE != IO_BASE)
843 code_resource.start = __pa_symbol(&_text);
844 code_resource.end = __pa_symbol(&_etext) - 1;
845 data_resource.start = __pa_symbol(&_etext);
846 data_resource.end = __pa_symbol(&_edata) - 1;
847 bss_resource.start = __pa_symbol(&__bss_start);
848 bss_resource.end = __pa_symbol(&__bss_stop) - 1;
850 for (i = 0; i < boot_mem_map.nr_map; i++) {
851 struct resource *res;
852 unsigned long start, end;
854 start = boot_mem_map.map[i].addr;
855 end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
856 if (start >= HIGHMEM_START)
858 if (end >= HIGHMEM_START)
859 end = HIGHMEM_START - 1;
861 res = memblock_alloc(sizeof(struct resource), SMP_CACHE_BYTES);
863 panic("%s: Failed to allocate %zu bytes\n", __func__,
864 sizeof(struct resource));
868 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
870 switch (boot_mem_map.map[i].type) {
872 case BOOT_MEM_INIT_RAM:
873 case BOOT_MEM_ROM_DATA:
874 res->name = "System RAM";
875 res->flags |= IORESOURCE_SYSRAM;
877 case BOOT_MEM_RESERVED:
880 res->name = "reserved";
883 request_resource(&iomem_resource, res);
886 * We don't know which RAM region contains kernel data,
887 * so we try it repeatedly and let the resource manager
890 request_resource(res, &code_resource);
891 request_resource(res, &data_resource);
892 request_resource(res, &bss_resource);
893 request_crashkernel(res);
898 static void __init prefill_possible_map(void)
900 int i, possible = num_possible_cpus();
902 if (possible > nr_cpu_ids)
903 possible = nr_cpu_ids;
905 for (i = 0; i < possible; i++)
906 set_cpu_possible(i, true);
907 for (; i < NR_CPUS; i++)
908 set_cpu_possible(i, false);
910 nr_cpu_ids = possible;
913 static inline void prefill_possible_map(void) {}
916 void __init setup_arch(char **cmdline_p)
922 setup_early_fdc_console();
923 #ifdef CONFIG_EARLY_PRINTK
924 setup_early_printk();
929 #if defined(CONFIG_VT)
930 #if defined(CONFIG_VGA_CONSOLE)
931 conswitchp = &vga_con;
932 #elif defined(CONFIG_DUMMY_CONSOLE)
933 conswitchp = &dummy_con;
937 arch_mem_init(cmdline_p);
941 prefill_possible_map();
947 unsigned long kernelsp[NR_CPUS];
948 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
951 unsigned long fw_passed_dtb;
954 #ifdef CONFIG_DEBUG_FS
955 struct dentry *mips_debugfs_dir;
956 static int __init debugfs_mips(void)
958 mips_debugfs_dir = debugfs_create_dir("mips", NULL);
961 arch_initcall(debugfs_mips);
964 #ifdef CONFIG_DMA_MAYBE_COHERENT
965 /* User defined DMA coherency from command line. */
966 enum coherent_io_user_state coherentio = IO_COHERENCE_DEFAULT;
967 EXPORT_SYMBOL_GPL(coherentio);
968 int hw_coherentio = 0; /* Actual hardware supported DMA coherency setting. */
970 static int __init setcoherentio(char *str)
972 coherentio = IO_COHERENCE_ENABLED;
973 pr_info("Hardware DMA cache coherency (command line)\n");
976 early_param("coherentio", setcoherentio);
978 static int __init setnocoherentio(char *str)
980 coherentio = IO_COHERENCE_DISABLED;
981 pr_info("Software DMA cache coherency (command line)\n");
984 early_param("nocoherentio", setnocoherentio);