2 * linux/arch/arm/kernel/setup.c
4 * Copyright (C) 1995-2001 Russell King
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
10 #include <linux/export.h>
11 #include <linux/kernel.h>
12 #include <linux/stddef.h>
13 #include <linux/ioport.h>
14 #include <linux/delay.h>
15 #include <linux/utsname.h>
16 #include <linux/initrd.h>
17 #include <linux/console.h>
18 #include <linux/bootmem.h>
19 #include <linux/seq_file.h>
20 #include <linux/screen_info.h>
21 #include <linux/init.h>
22 #include <linux/kexec.h>
23 #include <linux/of_fdt.h>
24 #include <linux/root_dev.h>
25 #include <linux/cpu.h>
26 #include <linux/interrupt.h>
27 #include <linux/smp.h>
29 #include <linux/proc_fs.h>
30 #include <linux/memblock.h>
31 #include <linux/bug.h>
32 #include <linux/compiler.h>
33 #include <linux/sort.h>
35 #include <asm/unified.h>
38 #include <asm/cputype.h>
40 #include <asm/procinfo.h>
41 #include <asm/sections.h>
42 #include <asm/setup.h>
43 #include <asm/smp_plat.h>
44 #include <asm/mach-types.h>
45 #include <asm/cacheflush.h>
46 #include <asm/cachetype.h>
47 #include <asm/tlbflush.h>
50 #include <asm/mach/arch.h>
51 #include <asm/mach/irq.h>
52 #include <asm/mach/time.h>
53 #include <asm/system_info.h>
54 #include <asm/system_misc.h>
55 #include <asm/traps.h>
56 #include <asm/unwind.h>
57 #include <asm/memblock.h>
59 #if defined(CONFIG_DEPRECATED_PARAM_STRUCT)
66 #define MEM_SIZE (16*1024*1024)
69 #if defined(CONFIG_FPE_NWFPE) || defined(CONFIG_FPE_FASTFPE)
72 static int __init fpe_setup(char *line)
74 memcpy(fpe_type, line, 8);
78 __setup("fpe=", fpe_setup);
81 extern void paging_init(struct machine_desc *desc);
82 extern void sanity_check_meminfo(void);
83 extern void reboot_setup(char *str);
85 unsigned int processor_id;
86 EXPORT_SYMBOL(processor_id);
87 unsigned int __machine_arch_type __read_mostly;
88 EXPORT_SYMBOL(__machine_arch_type);
89 unsigned int cacheid __read_mostly;
90 EXPORT_SYMBOL(cacheid);
92 unsigned int __atags_pointer __initdata;
94 unsigned int system_rev;
95 EXPORT_SYMBOL(system_rev);
97 unsigned int system_serial_low;
98 EXPORT_SYMBOL(system_serial_low);
100 unsigned int system_serial_high;
101 EXPORT_SYMBOL(system_serial_high);
103 unsigned int elf_hwcap __read_mostly;
104 EXPORT_SYMBOL(elf_hwcap);
108 struct processor processor __read_mostly;
111 struct cpu_tlb_fns cpu_tlb __read_mostly;
114 struct cpu_user_fns cpu_user __read_mostly;
117 struct cpu_cache_fns cpu_cache __read_mostly;
119 #ifdef CONFIG_OUTER_CACHE
120 struct outer_cache_fns outer_cache __read_mostly;
121 EXPORT_SYMBOL(outer_cache);
125 * Cached cpu_architecture() result for use by assembler code.
126 * C code should use the cpu_architecture() function instead of accessing this
129 int __cpu_architecture __read_mostly = CPU_ARCH_UNKNOWN;
135 } ____cacheline_aligned;
137 static struct stack stacks[NR_CPUS];
139 char elf_platform[ELF_PLATFORM_SIZE];
140 EXPORT_SYMBOL(elf_platform);
142 static const char *cpu_name;
143 static const char *machine_name;
144 static char __initdata cmd_line[COMMAND_LINE_SIZE];
145 struct machine_desc *machine_desc __initdata;
147 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
148 static union { char c[4]; unsigned long l; } endian_test __initdata = { { 'l', '?', '?', 'b' } };
149 #define ENDIANNESS ((char)endian_test.l)
151 DEFINE_PER_CPU(struct cpuinfo_arm, cpu_data);
154 * Standard memory resources
156 static struct resource mem_res[] = {
161 .flags = IORESOURCE_MEM
164 .name = "Kernel code",
167 .flags = IORESOURCE_MEM
170 .name = "Kernel data",
173 .flags = IORESOURCE_MEM
177 #define video_ram mem_res[0]
178 #define kernel_code mem_res[1]
179 #define kernel_data mem_res[2]
181 static struct resource io_res[] = {
186 .flags = IORESOURCE_IO | IORESOURCE_BUSY
192 .flags = IORESOURCE_IO | IORESOURCE_BUSY
198 .flags = IORESOURCE_IO | IORESOURCE_BUSY
202 #define lp0 io_res[0]
203 #define lp1 io_res[1]
204 #define lp2 io_res[2]
206 static const char *proc_arch[] = {
226 static int __get_cpu_architecture(void)
230 if ((read_cpuid_id() & 0x0008f000) == 0) {
231 cpu_arch = CPU_ARCH_UNKNOWN;
232 } else if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
233 cpu_arch = (read_cpuid_id() & (1 << 23)) ? CPU_ARCH_ARMv4T : CPU_ARCH_ARMv3;
234 } else if ((read_cpuid_id() & 0x00080000) == 0x00000000) {
235 cpu_arch = (read_cpuid_id() >> 16) & 7;
237 cpu_arch += CPU_ARCH_ARMv3;
238 } else if ((read_cpuid_id() & 0x000f0000) == 0x000f0000) {
241 /* Revised CPUID format. Read the Memory Model Feature
242 * Register 0 and check for VMSAv7 or PMSAv7 */
243 asm("mrc p15, 0, %0, c0, c1, 4"
245 if ((mmfr0 & 0x0000000f) >= 0x00000003 ||
246 (mmfr0 & 0x000000f0) >= 0x00000030)
247 cpu_arch = CPU_ARCH_ARMv7;
248 else if ((mmfr0 & 0x0000000f) == 0x00000002 ||
249 (mmfr0 & 0x000000f0) == 0x00000020)
250 cpu_arch = CPU_ARCH_ARMv6;
252 cpu_arch = CPU_ARCH_UNKNOWN;
254 cpu_arch = CPU_ARCH_UNKNOWN;
259 int __pure cpu_architecture(void)
261 BUG_ON(__cpu_architecture == CPU_ARCH_UNKNOWN);
263 return __cpu_architecture;
266 static int cpu_has_aliasing_icache(unsigned int arch)
269 unsigned int id_reg, num_sets, line_size;
271 /* PIPT caches never alias. */
272 if (icache_is_pipt())
275 /* arch specifies the register format */
278 asm("mcr p15, 2, %0, c0, c0, 0 @ set CSSELR"
279 : /* No output operands */
282 asm("mrc p15, 1, %0, c0, c0, 0 @ read CCSIDR"
284 line_size = 4 << ((id_reg & 0x7) + 2);
285 num_sets = ((id_reg >> 13) & 0x7fff) + 1;
286 aliasing_icache = (line_size * num_sets) > PAGE_SIZE;
289 aliasing_icache = read_cpuid_cachetype() & (1 << 11);
292 /* I-cache aliases will be handled by D-cache aliasing code */
296 return aliasing_icache;
299 static void __init cacheid_init(void)
301 unsigned int cachetype = read_cpuid_cachetype();
302 unsigned int arch = cpu_architecture();
304 if (arch >= CPU_ARCH_ARMv6) {
305 if ((cachetype & (7 << 29)) == 4 << 29) {
306 /* ARMv7 register format */
307 arch = CPU_ARCH_ARMv7;
308 cacheid = CACHEID_VIPT_NONALIASING;
309 switch (cachetype & (3 << 14)) {
311 cacheid |= CACHEID_ASID_TAGGED;
314 cacheid |= CACHEID_PIPT;
318 arch = CPU_ARCH_ARMv6;
319 if (cachetype & (1 << 23))
320 cacheid = CACHEID_VIPT_ALIASING;
322 cacheid = CACHEID_VIPT_NONALIASING;
324 if (cpu_has_aliasing_icache(arch))
325 cacheid |= CACHEID_VIPT_I_ALIASING;
327 cacheid = CACHEID_VIVT;
330 printk("CPU: %s data cache, %s instruction cache\n",
331 cache_is_vivt() ? "VIVT" :
332 cache_is_vipt_aliasing() ? "VIPT aliasing" :
333 cache_is_vipt_nonaliasing() ? "PIPT / VIPT nonaliasing" : "unknown",
334 cache_is_vivt() ? "VIVT" :
335 icache_is_vivt_asid_tagged() ? "VIVT ASID tagged" :
336 icache_is_vipt_aliasing() ? "VIPT aliasing" :
337 icache_is_pipt() ? "PIPT" :
338 cache_is_vipt_nonaliasing() ? "VIPT nonaliasing" : "unknown");
342 * These functions re-use the assembly code in head.S, which
343 * already provide the required functionality.
345 extern struct proc_info_list *lookup_processor_type(unsigned int);
347 void __init early_print(const char *str, ...)
349 extern void printascii(const char *);
354 vsnprintf(buf, sizeof(buf), str, ap);
357 #ifdef CONFIG_DEBUG_LL
363 static void __init feat_v6_fixup(void)
365 int id = read_cpuid_id();
367 if ((id & 0xff0f0000) != 0x41070000)
371 * HWCAP_TLS is available only on 1136 r1p0 and later,
372 * see also kuser_get_tls_init.
374 if ((((id >> 4) & 0xfff) == 0xb36) && (((id >> 20) & 3) == 0))
375 elf_hwcap &= ~HWCAP_TLS;
379 * cpu_init - initialise one CPU.
381 * cpu_init sets up the per-CPU stacks.
385 unsigned int cpu = smp_processor_id();
386 struct stack *stk = &stacks[cpu];
388 if (cpu >= NR_CPUS) {
389 printk(KERN_CRIT "CPU%u: bad primary CPU number\n", cpu);
396 * Define the placement constraint for the inline asm directive below.
397 * In Thumb-2, msr with an immediate value is not allowed.
399 #ifdef CONFIG_THUMB2_KERNEL
406 * setup stacks for re-entrant exception handlers
410 "add r14, %0, %2\n\t"
413 "add r14, %0, %4\n\t"
416 "add r14, %0, %6\n\t"
421 PLC (PSR_F_BIT | PSR_I_BIT | IRQ_MODE),
422 "I" (offsetof(struct stack, irq[0])),
423 PLC (PSR_F_BIT | PSR_I_BIT | ABT_MODE),
424 "I" (offsetof(struct stack, abt[0])),
425 PLC (PSR_F_BIT | PSR_I_BIT | UND_MODE),
426 "I" (offsetof(struct stack, und[0])),
427 PLC (PSR_F_BIT | PSR_I_BIT | SVC_MODE)
431 int __cpu_logical_map[NR_CPUS];
433 void __init smp_setup_processor_id(void)
436 u32 cpu = is_smp() ? read_cpuid_mpidr() & 0xff : 0;
438 cpu_logical_map(0) = cpu;
439 for (i = 1; i < NR_CPUS; ++i)
440 cpu_logical_map(i) = i == cpu ? 0 : i;
442 printk(KERN_INFO "Booting Linux on physical CPU %d\n", cpu);
445 static void __init setup_processor(void)
447 struct proc_info_list *list;
450 * locate processor in the list of supported processor
451 * types. The linker builds this table for us from the
452 * entries in arch/arm/mm/proc-*.S
454 list = lookup_processor_type(read_cpuid_id());
456 printk("CPU configuration botched (ID %08x), unable "
457 "to continue.\n", read_cpuid_id());
461 cpu_name = list->cpu_name;
462 __cpu_architecture = __get_cpu_architecture();
465 processor = *list->proc;
468 cpu_tlb = *list->tlb;
471 cpu_user = *list->user;
474 cpu_cache = *list->cache;
477 printk("CPU: %s [%08x] revision %d (ARMv%s), cr=%08lx\n",
478 cpu_name, read_cpuid_id(), read_cpuid_id() & 15,
479 proc_arch[cpu_architecture()], cr_alignment);
481 snprintf(init_utsname()->machine, __NEW_UTS_LEN + 1, "%s%c",
482 list->arch_name, ENDIANNESS);
483 snprintf(elf_platform, ELF_PLATFORM_SIZE, "%s%c",
484 list->elf_name, ENDIANNESS);
485 elf_hwcap = list->elf_hwcap;
486 #ifndef CONFIG_ARM_THUMB
487 elf_hwcap &= ~HWCAP_THUMB;
496 void __init dump_machine_table(void)
498 struct machine_desc *p;
500 early_print("Available machine support:\n\nID (hex)\tNAME\n");
501 for_each_machine_desc(p)
502 early_print("%08x\t%s\n", p->nr, p->name);
504 early_print("\nPlease check your kernel config and/or bootloader.\n");
507 /* can't use cpu_relax() here as it may require MMU setup */;
510 int __init arm_add_memory(phys_addr_t start, unsigned long size)
512 struct membank *bank = &meminfo.bank[meminfo.nr_banks];
514 if (meminfo.nr_banks >= NR_BANKS) {
515 printk(KERN_CRIT "NR_BANKS too low, "
516 "ignoring memory at 0x%08llx\n", (long long)start);
521 * Ensure that start/size are aligned to a page boundary.
522 * Size is appropriately rounded down, start is rounded up.
524 size -= start & ~PAGE_MASK;
525 bank->start = PAGE_ALIGN(start);
526 bank->size = size & PAGE_MASK;
529 * Check whether this memory region has non-zero size or
530 * invalid node number.
540 * Pick out the memory size. We look for mem=size@start,
541 * where start and size are "size[KkMm]"
543 static int __init early_mem(char *p)
545 static int usermem __initdata = 0;
551 * If the user specifies memory size, we
552 * blow away any automatically generated
557 meminfo.nr_banks = 0;
561 size = memparse(p, &endp);
563 start = memparse(endp + 1, NULL);
565 arm_add_memory(start, size);
569 early_param("mem", early_mem);
572 setup_ramdisk(int doload, int prompt, int image_start, unsigned int rd_sz)
574 #ifdef CONFIG_BLK_DEV_RAM
575 extern int rd_size, rd_image_start, rd_prompt, rd_doload;
577 rd_image_start = image_start;
586 static void __init request_standard_resources(struct machine_desc *mdesc)
588 struct memblock_region *region;
589 struct resource *res;
591 kernel_code.start = virt_to_phys(_text);
592 kernel_code.end = virt_to_phys(_etext - 1);
593 kernel_data.start = virt_to_phys(_sdata);
594 kernel_data.end = virt_to_phys(_end - 1);
596 for_each_memblock(memory, region) {
597 res = alloc_bootmem_low(sizeof(*res));
598 res->name = "System RAM";
599 res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
600 res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
601 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
603 request_resource(&iomem_resource, res);
605 if (kernel_code.start >= res->start &&
606 kernel_code.end <= res->end)
607 request_resource(res, &kernel_code);
608 if (kernel_data.start >= res->start &&
609 kernel_data.end <= res->end)
610 request_resource(res, &kernel_data);
613 if (mdesc->video_start) {
614 video_ram.start = mdesc->video_start;
615 video_ram.end = mdesc->video_end;
616 request_resource(&iomem_resource, &video_ram);
620 * Some machines don't have the possibility of ever
621 * possessing lp0, lp1 or lp2
623 if (mdesc->reserve_lp0)
624 request_resource(&ioport_resource, &lp0);
625 if (mdesc->reserve_lp1)
626 request_resource(&ioport_resource, &lp1);
627 if (mdesc->reserve_lp2)
628 request_resource(&ioport_resource, &lp2);
634 * This is the new way of passing data to the kernel at boot time. Rather
635 * than passing a fixed inflexible structure to the kernel, we pass a list
636 * of variable-sized tags to the kernel. The first tag must be a ATAG_CORE
637 * tag for the list to be recognised (to distinguish the tagged list from
638 * a param_struct). The list is terminated with a zero-length tag (this tag
639 * is not parsed in any way).
641 static int __init parse_tag_core(const struct tag *tag)
643 if (tag->hdr.size > 2) {
644 if ((tag->u.core.flags & 1) == 0)
645 root_mountflags &= ~MS_RDONLY;
646 ROOT_DEV = old_decode_dev(tag->u.core.rootdev);
651 __tagtable(ATAG_CORE, parse_tag_core);
653 static int __init parse_tag_mem32(const struct tag *tag)
655 return arm_add_memory(tag->u.mem.start, tag->u.mem.size);
658 __tagtable(ATAG_MEM, parse_tag_mem32);
660 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
661 struct screen_info screen_info = {
662 .orig_video_lines = 30,
663 .orig_video_cols = 80,
664 .orig_video_mode = 0,
665 .orig_video_ega_bx = 0,
666 .orig_video_isVGA = 1,
667 .orig_video_points = 8
670 static int __init parse_tag_videotext(const struct tag *tag)
672 screen_info.orig_x = tag->u.videotext.x;
673 screen_info.orig_y = tag->u.videotext.y;
674 screen_info.orig_video_page = tag->u.videotext.video_page;
675 screen_info.orig_video_mode = tag->u.videotext.video_mode;
676 screen_info.orig_video_cols = tag->u.videotext.video_cols;
677 screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx;
678 screen_info.orig_video_lines = tag->u.videotext.video_lines;
679 screen_info.orig_video_isVGA = tag->u.videotext.video_isvga;
680 screen_info.orig_video_points = tag->u.videotext.video_points;
684 __tagtable(ATAG_VIDEOTEXT, parse_tag_videotext);
687 static int __init parse_tag_ramdisk(const struct tag *tag)
689 setup_ramdisk((tag->u.ramdisk.flags & 1) == 0,
690 (tag->u.ramdisk.flags & 2) == 0,
691 tag->u.ramdisk.start, tag->u.ramdisk.size);
695 __tagtable(ATAG_RAMDISK, parse_tag_ramdisk);
697 static int __init parse_tag_serialnr(const struct tag *tag)
699 system_serial_low = tag->u.serialnr.low;
700 system_serial_high = tag->u.serialnr.high;
704 __tagtable(ATAG_SERIAL, parse_tag_serialnr);
706 static int __init parse_tag_revision(const struct tag *tag)
708 system_rev = tag->u.revision.rev;
712 __tagtable(ATAG_REVISION, parse_tag_revision);
714 static int __init parse_tag_cmdline(const struct tag *tag)
716 #if defined(CONFIG_CMDLINE_EXTEND)
717 strlcat(default_command_line, " ", COMMAND_LINE_SIZE);
718 strlcat(default_command_line, tag->u.cmdline.cmdline,
720 #elif defined(CONFIG_CMDLINE_FORCE)
721 pr_warning("Ignoring tag cmdline (using the default kernel command line)\n");
723 strlcpy(default_command_line, tag->u.cmdline.cmdline,
729 __tagtable(ATAG_CMDLINE, parse_tag_cmdline);
732 * Scan the tag table for this tag, and call its parse function.
733 * The tag table is built by the linker from all the __tagtable
736 static int __init parse_tag(const struct tag *tag)
738 extern struct tagtable __tagtable_begin, __tagtable_end;
741 for (t = &__tagtable_begin; t < &__tagtable_end; t++)
742 if (tag->hdr.tag == t->tag) {
747 return t < &__tagtable_end;
751 * Parse all tags in the list, checking both the global and architecture
752 * specific tag tables.
754 static void __init parse_tags(const struct tag *t)
756 for (; t->hdr.size; t = tag_next(t))
759 "Ignoring unrecognised tag 0x%08x\n",
764 * This holds our defaults.
766 static struct init_tags {
767 struct tag_header hdr1;
768 struct tag_core core;
769 struct tag_header hdr2;
770 struct tag_mem32 mem;
771 struct tag_header hdr3;
772 } init_tags __initdata = {
773 { tag_size(tag_core), ATAG_CORE },
774 { 1, PAGE_SIZE, 0xff },
775 { tag_size(tag_mem32), ATAG_MEM },
780 static int __init customize_machine(void)
782 /* customizes platform devices, or adds new ones */
783 if (machine_desc->init_machine)
784 machine_desc->init_machine();
787 arch_initcall(customize_machine);
790 static inline unsigned long long get_total_mem(void)
794 total = max_low_pfn - min_low_pfn;
795 return total << PAGE_SHIFT;
799 * reserve_crashkernel() - reserves memory are for crash kernel
801 * This function reserves memory area given in "crashkernel=" kernel command
802 * line parameter. The memory reserved is used by a dump capture kernel when
803 * primary kernel is crashing.
805 static void __init reserve_crashkernel(void)
807 unsigned long long crash_size, crash_base;
808 unsigned long long total_mem;
811 total_mem = get_total_mem();
812 ret = parse_crashkernel(boot_command_line, total_mem,
813 &crash_size, &crash_base);
817 ret = reserve_bootmem(crash_base, crash_size, BOOTMEM_EXCLUSIVE);
819 printk(KERN_WARNING "crashkernel reservation failed - "
820 "memory is in use (0x%lx)\n", (unsigned long)crash_base);
824 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
825 "for crashkernel (System RAM: %ldMB)\n",
826 (unsigned long)(crash_size >> 20),
827 (unsigned long)(crash_base >> 20),
828 (unsigned long)(total_mem >> 20));
830 crashk_res.start = crash_base;
831 crashk_res.end = crash_base + crash_size - 1;
832 insert_resource(&iomem_resource, &crashk_res);
835 static inline void reserve_crashkernel(void) {}
836 #endif /* CONFIG_KEXEC */
838 static void __init squash_mem_tags(struct tag *tag)
840 for (; tag->hdr.size; tag = tag_next(tag))
841 if (tag->hdr.tag == ATAG_MEM)
842 tag->hdr.tag = ATAG_NONE;
845 static struct machine_desc * __init setup_machine_tags(unsigned int nr)
847 struct tag *tags = (struct tag *)&init_tags;
848 struct machine_desc *mdesc = NULL, *p;
849 char *from = default_command_line;
851 init_tags.mem.start = PHYS_OFFSET;
854 * locate machine in the list of supported machines.
856 for_each_machine_desc(p)
858 printk("Machine: %s\n", p->name);
864 early_print("\nError: unrecognized/unsupported machine ID"
865 " (r1 = 0x%08x).\n\n", nr);
866 dump_machine_table(); /* does not return */
870 tags = phys_to_virt(__atags_pointer);
871 else if (mdesc->atag_offset)
872 tags = (void *)(PAGE_OFFSET + mdesc->atag_offset);
874 #if defined(CONFIG_DEPRECATED_PARAM_STRUCT)
876 * If we have the old style parameters, convert them to
879 if (tags->hdr.tag != ATAG_CORE)
880 convert_to_tag_list(tags);
883 if (tags->hdr.tag != ATAG_CORE) {
884 #if defined(CONFIG_OF)
886 * If CONFIG_OF is set, then assume this is a reasonably
887 * modern system that should pass boot parameters
889 early_print("Warning: Neither atags nor dtb found\n");
891 tags = (struct tag *)&init_tags;
895 mdesc->fixup(tags, &from, &meminfo);
897 if (tags->hdr.tag == ATAG_CORE) {
898 if (meminfo.nr_banks != 0)
899 squash_mem_tags(tags);
904 /* parse_early_param needs a boot_command_line */
905 strlcpy(boot_command_line, from, COMMAND_LINE_SIZE);
910 static int __init meminfo_cmp(const void *_a, const void *_b)
912 const struct membank *a = _a, *b = _b;
913 long cmp = bank_pfn_start(a) - bank_pfn_start(b);
914 return cmp < 0 ? -1 : cmp > 0 ? 1 : 0;
917 void __init setup_arch(char **cmdline_p)
919 struct machine_desc *mdesc;
922 mdesc = setup_machine_fdt(__atags_pointer);
924 mdesc = setup_machine_tags(machine_arch_type);
925 machine_desc = mdesc;
926 machine_name = mdesc->name;
928 #ifdef CONFIG_ZONE_DMA
929 if (mdesc->dma_zone_size) {
930 extern unsigned long arm_dma_zone_size;
931 arm_dma_zone_size = mdesc->dma_zone_size;
934 if (mdesc->restart_mode)
935 reboot_setup(&mdesc->restart_mode);
937 init_mm.start_code = (unsigned long) _text;
938 init_mm.end_code = (unsigned long) _etext;
939 init_mm.end_data = (unsigned long) _edata;
940 init_mm.brk = (unsigned long) _end;
942 /* populate cmd_line too for later use, preserving boot_command_line */
943 strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);
944 *cmdline_p = cmd_line;
948 sort(&meminfo.bank, meminfo.nr_banks, sizeof(meminfo.bank[0]), meminfo_cmp, NULL);
949 sanity_check_meminfo();
950 arm_memblock_init(&meminfo, mdesc);
953 request_standard_resources(mdesc);
956 arm_pm_restart = mdesc->restart;
958 unflatten_device_tree();
964 reserve_crashkernel();
968 #ifdef CONFIG_MULTI_IRQ_HANDLER
969 handle_arch_irq = mdesc->handle_irq;
973 #if defined(CONFIG_VGA_CONSOLE)
974 conswitchp = &vga_con;
975 #elif defined(CONFIG_DUMMY_CONSOLE)
976 conswitchp = &dummy_con;
980 if (mdesc->init_early)
985 static int __init topology_init(void)
989 for_each_possible_cpu(cpu) {
990 struct cpuinfo_arm *cpuinfo = &per_cpu(cpu_data, cpu);
991 cpuinfo->cpu.hotpluggable = 1;
992 register_cpu(&cpuinfo->cpu, cpu);
997 subsys_initcall(topology_init);
999 #ifdef CONFIG_HAVE_PROC_CPU
1000 static int __init proc_cpu_init(void)
1002 struct proc_dir_entry *res;
1004 res = proc_mkdir("cpu", NULL);
1009 fs_initcall(proc_cpu_init);
1012 static const char *hwcap_str[] = {
1035 static int c_show(struct seq_file *m, void *v)
1039 seq_printf(m, "Processor\t: %s rev %d (%s)\n",
1040 cpu_name, read_cpuid_id() & 15, elf_platform);
1042 #if defined(CONFIG_SMP)
1043 for_each_online_cpu(i) {
1045 * glibc reads /proc/cpuinfo to determine the number of
1046 * online processors, looking for lines beginning with
1047 * "processor". Give glibc what it expects.
1049 seq_printf(m, "processor\t: %d\n", i);
1050 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n",
1051 per_cpu(cpu_data, i).loops_per_jiffy / (500000UL/HZ),
1052 (per_cpu(cpu_data, i).loops_per_jiffy / (5000UL/HZ)) % 100);
1054 #else /* CONFIG_SMP */
1055 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
1056 loops_per_jiffy / (500000/HZ),
1057 (loops_per_jiffy / (5000/HZ)) % 100);
1060 /* dump out the processor features */
1061 seq_puts(m, "Features\t: ");
1063 for (i = 0; hwcap_str[i]; i++)
1064 if (elf_hwcap & (1 << i))
1065 seq_printf(m, "%s ", hwcap_str[i]);
1067 seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24);
1068 seq_printf(m, "CPU architecture: %s\n", proc_arch[cpu_architecture()]);
1070 if ((read_cpuid_id() & 0x0008f000) == 0x00000000) {
1072 seq_printf(m, "CPU part\t: %07x\n", read_cpuid_id() >> 4);
1074 if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
1076 seq_printf(m, "CPU variant\t: 0x%02x\n",
1077 (read_cpuid_id() >> 16) & 127);
1080 seq_printf(m, "CPU variant\t: 0x%x\n",
1081 (read_cpuid_id() >> 20) & 15);
1083 seq_printf(m, "CPU part\t: 0x%03x\n",
1084 (read_cpuid_id() >> 4) & 0xfff);
1086 seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15);
1090 seq_printf(m, "Hardware\t: %s\n", machine_name);
1091 seq_printf(m, "Revision\t: %04x\n", system_rev);
1092 seq_printf(m, "Serial\t\t: %08x%08x\n",
1093 system_serial_high, system_serial_low);
1098 static void *c_start(struct seq_file *m, loff_t *pos)
1100 return *pos < 1 ? (void *)1 : NULL;
1103 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
1109 static void c_stop(struct seq_file *m, void *v)
1113 const struct seq_operations cpuinfo_op = {