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/crash_dump.h>
25 #include <linux/root_dev.h>
26 #include <linux/cpu.h>
27 #include <linux/interrupt.h>
28 #include <linux/smp.h>
30 #include <linux/proc_fs.h>
31 #include <linux/memblock.h>
32 #include <linux/bug.h>
33 #include <linux/compiler.h>
34 #include <linux/sort.h>
36 #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>
48 #include <asm/system.h>
51 #include <asm/mach/arch.h>
52 #include <asm/mach/irq.h>
53 #include <asm/mach/time.h>
54 #include <asm/traps.h>
55 #include <asm/unwind.h>
56 #include <asm/memblock.h>
58 #if defined(CONFIG_DEPRECATED_PARAM_STRUCT)
65 #define MEM_SIZE (16*1024*1024)
68 #if defined(CONFIG_FPE_NWFPE) || defined(CONFIG_FPE_FASTFPE)
71 static int __init fpe_setup(char *line)
73 memcpy(fpe_type, line, 8);
77 __setup("fpe=", fpe_setup);
80 extern void paging_init(struct machine_desc *desc);
81 extern void sanity_check_meminfo(void);
82 extern void reboot_setup(char *str);
84 unsigned int processor_id;
85 EXPORT_SYMBOL(processor_id);
86 unsigned int __machine_arch_type __read_mostly;
87 EXPORT_SYMBOL(__machine_arch_type);
88 unsigned int cacheid __read_mostly;
89 EXPORT_SYMBOL(cacheid);
91 unsigned int __atags_pointer __initdata;
93 unsigned int system_rev;
94 EXPORT_SYMBOL(system_rev);
96 unsigned int system_serial_low;
97 EXPORT_SYMBOL(system_serial_low);
99 unsigned int system_serial_high;
100 EXPORT_SYMBOL(system_serial_high);
102 unsigned int elf_hwcap __read_mostly;
103 EXPORT_SYMBOL(elf_hwcap);
107 struct processor processor __read_mostly;
110 struct cpu_tlb_fns cpu_tlb __read_mostly;
113 struct cpu_user_fns cpu_user __read_mostly;
116 struct cpu_cache_fns cpu_cache __read_mostly;
118 #ifdef CONFIG_OUTER_CACHE
119 struct outer_cache_fns outer_cache __read_mostly;
120 EXPORT_SYMBOL(outer_cache);
124 * Cached cpu_architecture() result for use by assembler code.
125 * C code should use the cpu_architecture() function instead of accessing this
128 int __cpu_architecture __read_mostly = CPU_ARCH_UNKNOWN;
134 } ____cacheline_aligned;
136 static struct stack stacks[NR_CPUS];
138 char elf_platform[ELF_PLATFORM_SIZE];
139 EXPORT_SYMBOL(elf_platform);
141 static const char *cpu_name;
142 static const char *machine_name;
143 static char __initdata cmd_line[COMMAND_LINE_SIZE];
144 struct machine_desc *machine_desc __initdata;
146 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
147 static union { char c[4]; unsigned long l; } endian_test __initdata = { { 'l', '?', '?', 'b' } };
148 #define ENDIANNESS ((char)endian_test.l)
150 DEFINE_PER_CPU(struct cpuinfo_arm, cpu_data);
153 * Standard memory resources
155 static struct resource mem_res[] = {
160 .flags = IORESOURCE_MEM
163 .name = "Kernel text",
166 .flags = IORESOURCE_MEM
169 .name = "Kernel data",
172 .flags = IORESOURCE_MEM
176 #define video_ram mem_res[0]
177 #define kernel_code mem_res[1]
178 #define kernel_data mem_res[2]
180 static struct resource io_res[] = {
185 .flags = IORESOURCE_IO | IORESOURCE_BUSY
191 .flags = IORESOURCE_IO | IORESOURCE_BUSY
197 .flags = IORESOURCE_IO | IORESOURCE_BUSY
201 #define lp0 io_res[0]
202 #define lp1 io_res[1]
203 #define lp2 io_res[2]
205 static const char *proc_arch[] = {
225 static int __get_cpu_architecture(void)
229 if ((read_cpuid_id() & 0x0008f000) == 0) {
230 cpu_arch = CPU_ARCH_UNKNOWN;
231 } else if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
232 cpu_arch = (read_cpuid_id() & (1 << 23)) ? CPU_ARCH_ARMv4T : CPU_ARCH_ARMv3;
233 } else if ((read_cpuid_id() & 0x00080000) == 0x00000000) {
234 cpu_arch = (read_cpuid_id() >> 16) & 7;
236 cpu_arch += CPU_ARCH_ARMv3;
237 } else if ((read_cpuid_id() & 0x000f0000) == 0x000f0000) {
240 /* Revised CPUID format. Read the Memory Model Feature
241 * Register 0 and check for VMSAv7 or PMSAv7 */
242 asm("mrc p15, 0, %0, c0, c1, 4"
244 if ((mmfr0 & 0x0000000f) >= 0x00000003 ||
245 (mmfr0 & 0x000000f0) >= 0x00000030)
246 cpu_arch = CPU_ARCH_ARMv7;
247 else if ((mmfr0 & 0x0000000f) == 0x00000002 ||
248 (mmfr0 & 0x000000f0) == 0x00000020)
249 cpu_arch = CPU_ARCH_ARMv6;
251 cpu_arch = CPU_ARCH_UNKNOWN;
253 cpu_arch = CPU_ARCH_UNKNOWN;
258 int __pure cpu_architecture(void)
260 BUG_ON(__cpu_architecture == CPU_ARCH_UNKNOWN);
262 return __cpu_architecture;
265 static int cpu_has_aliasing_icache(unsigned int arch)
268 unsigned int id_reg, num_sets, line_size;
270 /* PIPT caches never alias. */
271 if (icache_is_pipt())
274 /* arch specifies the register format */
277 asm("mcr p15, 2, %0, c0, c0, 0 @ set CSSELR"
278 : /* No output operands */
281 asm("mrc p15, 1, %0, c0, c0, 0 @ read CCSIDR"
283 line_size = 4 << ((id_reg & 0x7) + 2);
284 num_sets = ((id_reg >> 13) & 0x7fff) + 1;
285 aliasing_icache = (line_size * num_sets) > PAGE_SIZE;
288 aliasing_icache = read_cpuid_cachetype() & (1 << 11);
291 /* I-cache aliases will be handled by D-cache aliasing code */
295 return aliasing_icache;
298 static void __init cacheid_init(void)
300 unsigned int cachetype = read_cpuid_cachetype();
301 unsigned int arch = cpu_architecture();
303 if (arch >= CPU_ARCH_ARMv6) {
304 if ((cachetype & (7 << 29)) == 4 << 29) {
305 /* ARMv7 register format */
306 arch = CPU_ARCH_ARMv7;
307 cacheid = CACHEID_VIPT_NONALIASING;
308 switch (cachetype & (3 << 14)) {
310 cacheid |= CACHEID_ASID_TAGGED;
313 cacheid |= CACHEID_PIPT;
317 arch = CPU_ARCH_ARMv6;
318 if (cachetype & (1 << 23))
319 cacheid = CACHEID_VIPT_ALIASING;
321 cacheid = CACHEID_VIPT_NONALIASING;
323 if (cpu_has_aliasing_icache(arch))
324 cacheid |= CACHEID_VIPT_I_ALIASING;
326 cacheid = CACHEID_VIVT;
329 printk("CPU: %s data cache, %s instruction cache\n",
330 cache_is_vivt() ? "VIVT" :
331 cache_is_vipt_aliasing() ? "VIPT aliasing" :
332 cache_is_vipt_nonaliasing() ? "PIPT / VIPT nonaliasing" : "unknown",
333 cache_is_vivt() ? "VIVT" :
334 icache_is_vivt_asid_tagged() ? "VIVT ASID tagged" :
335 icache_is_vipt_aliasing() ? "VIPT aliasing" :
336 icache_is_pipt() ? "PIPT" :
337 cache_is_vipt_nonaliasing() ? "VIPT nonaliasing" : "unknown");
341 * These functions re-use the assembly code in head.S, which
342 * already provide the required functionality.
344 extern struct proc_info_list *lookup_processor_type(unsigned int);
346 void __init early_print(const char *str, ...)
348 extern void printascii(const char *);
353 vsnprintf(buf, sizeof(buf), str, ap);
356 #ifdef CONFIG_DEBUG_LL
362 static void __init feat_v6_fixup(void)
364 int id = read_cpuid_id();
366 if ((id & 0xff0f0000) != 0x41070000)
370 * HWCAP_TLS is available only on 1136 r1p0 and later,
371 * see also kuser_get_tls_init.
373 if ((((id >> 4) & 0xfff) == 0xb36) && (((id >> 20) & 3) == 0))
374 elf_hwcap &= ~HWCAP_TLS;
378 * cpu_init - initialise one CPU.
380 * cpu_init sets up the per-CPU stacks.
384 unsigned int cpu = smp_processor_id();
385 struct stack *stk = &stacks[cpu];
387 if (cpu >= NR_CPUS) {
388 printk(KERN_CRIT "CPU%u: bad primary CPU number\n", cpu);
395 * Define the placement constraint for the inline asm directive below.
396 * In Thumb-2, msr with an immediate value is not allowed.
398 #ifdef CONFIG_THUMB2_KERNEL
405 * setup stacks for re-entrant exception handlers
409 "add r14, %0, %2\n\t"
412 "add r14, %0, %4\n\t"
415 "add r14, %0, %6\n\t"
420 PLC (PSR_F_BIT | PSR_I_BIT | IRQ_MODE),
421 "I" (offsetof(struct stack, irq[0])),
422 PLC (PSR_F_BIT | PSR_I_BIT | ABT_MODE),
423 "I" (offsetof(struct stack, abt[0])),
424 PLC (PSR_F_BIT | PSR_I_BIT | UND_MODE),
425 "I" (offsetof(struct stack, und[0])),
426 PLC (PSR_F_BIT | PSR_I_BIT | SVC_MODE)
430 static void __init setup_processor(void)
432 struct proc_info_list *list;
435 * locate processor in the list of supported processor
436 * types. The linker builds this table for us from the
437 * entries in arch/arm/mm/proc-*.S
439 list = lookup_processor_type(read_cpuid_id());
441 printk("CPU configuration botched (ID %08x), unable "
442 "to continue.\n", read_cpuid_id());
446 cpu_name = list->cpu_name;
447 __cpu_architecture = __get_cpu_architecture();
450 processor = *list->proc;
453 cpu_tlb = *list->tlb;
456 cpu_user = *list->user;
459 cpu_cache = *list->cache;
462 printk("CPU: %s [%08x] revision %d (ARMv%s), cr=%08lx\n",
463 cpu_name, read_cpuid_id(), read_cpuid_id() & 15,
464 proc_arch[cpu_architecture()], cr_alignment);
466 snprintf(init_utsname()->machine, __NEW_UTS_LEN + 1, "%s%c",
467 list->arch_name, ENDIANNESS);
468 snprintf(elf_platform, ELF_PLATFORM_SIZE, "%s%c",
469 list->elf_name, ENDIANNESS);
470 elf_hwcap = list->elf_hwcap;
471 #ifndef CONFIG_ARM_THUMB
472 elf_hwcap &= ~HWCAP_THUMB;
481 void __init dump_machine_table(void)
483 struct machine_desc *p;
485 early_print("Available machine support:\n\nID (hex)\tNAME\n");
486 for_each_machine_desc(p)
487 early_print("%08x\t%s\n", p->nr, p->name);
489 early_print("\nPlease check your kernel config and/or bootloader.\n");
492 /* can't use cpu_relax() here as it may require MMU setup */;
495 int __init arm_add_memory(phys_addr_t start, unsigned long size)
497 struct membank *bank = &meminfo.bank[meminfo.nr_banks];
499 if (meminfo.nr_banks >= NR_BANKS) {
500 printk(KERN_CRIT "NR_BANKS too low, "
501 "ignoring memory at 0x%08llx\n", (long long)start);
506 * Ensure that start/size are aligned to a page boundary.
507 * Size is appropriately rounded down, start is rounded up.
509 size -= start & ~PAGE_MASK;
510 bank->start = PAGE_ALIGN(start);
511 bank->size = size & PAGE_MASK;
514 * Check whether this memory region has non-zero size or
515 * invalid node number.
525 * Pick out the memory size. We look for mem=size@start,
526 * where start and size are "size[KkMm]"
528 static int __init early_mem(char *p)
530 static int usermem __initdata = 0;
536 * If the user specifies memory size, we
537 * blow away any automatically generated
542 meminfo.nr_banks = 0;
546 size = memparse(p, &endp);
548 start = memparse(endp + 1, NULL);
550 arm_add_memory(start, size);
554 early_param("mem", early_mem);
557 setup_ramdisk(int doload, int prompt, int image_start, unsigned int rd_sz)
559 #ifdef CONFIG_BLK_DEV_RAM
560 extern int rd_size, rd_image_start, rd_prompt, rd_doload;
562 rd_image_start = image_start;
571 static void __init request_standard_resources(struct machine_desc *mdesc)
573 struct memblock_region *region;
574 struct resource *res;
576 kernel_code.start = virt_to_phys(_text);
577 kernel_code.end = virt_to_phys(_etext - 1);
578 kernel_data.start = virt_to_phys(_sdata);
579 kernel_data.end = virt_to_phys(_end - 1);
581 for_each_memblock(memory, region) {
582 res = alloc_bootmem_low(sizeof(*res));
583 res->name = "System RAM";
584 res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
585 res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
586 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
588 request_resource(&iomem_resource, res);
590 if (kernel_code.start >= res->start &&
591 kernel_code.end <= res->end)
592 request_resource(res, &kernel_code);
593 if (kernel_data.start >= res->start &&
594 kernel_data.end <= res->end)
595 request_resource(res, &kernel_data);
598 if (mdesc->video_start) {
599 video_ram.start = mdesc->video_start;
600 video_ram.end = mdesc->video_end;
601 request_resource(&iomem_resource, &video_ram);
605 * Some machines don't have the possibility of ever
606 * possessing lp0, lp1 or lp2
608 if (mdesc->reserve_lp0)
609 request_resource(&ioport_resource, &lp0);
610 if (mdesc->reserve_lp1)
611 request_resource(&ioport_resource, &lp1);
612 if (mdesc->reserve_lp2)
613 request_resource(&ioport_resource, &lp2);
619 * This is the new way of passing data to the kernel at boot time. Rather
620 * than passing a fixed inflexible structure to the kernel, we pass a list
621 * of variable-sized tags to the kernel. The first tag must be a ATAG_CORE
622 * tag for the list to be recognised (to distinguish the tagged list from
623 * a param_struct). The list is terminated with a zero-length tag (this tag
624 * is not parsed in any way).
626 static int __init parse_tag_core(const struct tag *tag)
628 if (tag->hdr.size > 2) {
629 if ((tag->u.core.flags & 1) == 0)
630 root_mountflags &= ~MS_RDONLY;
631 ROOT_DEV = old_decode_dev(tag->u.core.rootdev);
636 __tagtable(ATAG_CORE, parse_tag_core);
638 static int __init parse_tag_mem32(const struct tag *tag)
640 return arm_add_memory(tag->u.mem.start, tag->u.mem.size);
643 __tagtable(ATAG_MEM, parse_tag_mem32);
645 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
646 struct screen_info screen_info = {
647 .orig_video_lines = 30,
648 .orig_video_cols = 80,
649 .orig_video_mode = 0,
650 .orig_video_ega_bx = 0,
651 .orig_video_isVGA = 1,
652 .orig_video_points = 8
655 static int __init parse_tag_videotext(const struct tag *tag)
657 screen_info.orig_x = tag->u.videotext.x;
658 screen_info.orig_y = tag->u.videotext.y;
659 screen_info.orig_video_page = tag->u.videotext.video_page;
660 screen_info.orig_video_mode = tag->u.videotext.video_mode;
661 screen_info.orig_video_cols = tag->u.videotext.video_cols;
662 screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx;
663 screen_info.orig_video_lines = tag->u.videotext.video_lines;
664 screen_info.orig_video_isVGA = tag->u.videotext.video_isvga;
665 screen_info.orig_video_points = tag->u.videotext.video_points;
669 __tagtable(ATAG_VIDEOTEXT, parse_tag_videotext);
672 static int __init parse_tag_ramdisk(const struct tag *tag)
674 setup_ramdisk((tag->u.ramdisk.flags & 1) == 0,
675 (tag->u.ramdisk.flags & 2) == 0,
676 tag->u.ramdisk.start, tag->u.ramdisk.size);
680 __tagtable(ATAG_RAMDISK, parse_tag_ramdisk);
682 static int __init parse_tag_serialnr(const struct tag *tag)
684 system_serial_low = tag->u.serialnr.low;
685 system_serial_high = tag->u.serialnr.high;
689 __tagtable(ATAG_SERIAL, parse_tag_serialnr);
691 static int __init parse_tag_revision(const struct tag *tag)
693 system_rev = tag->u.revision.rev;
697 __tagtable(ATAG_REVISION, parse_tag_revision);
699 static int __init parse_tag_cmdline(const struct tag *tag)
701 #if defined(CONFIG_CMDLINE_EXTEND)
702 strlcat(default_command_line, " ", COMMAND_LINE_SIZE);
703 strlcat(default_command_line, tag->u.cmdline.cmdline,
705 #elif defined(CONFIG_CMDLINE_FORCE)
706 pr_warning("Ignoring tag cmdline (using the default kernel command line)\n");
708 strlcpy(default_command_line, tag->u.cmdline.cmdline,
714 __tagtable(ATAG_CMDLINE, parse_tag_cmdline);
717 * Scan the tag table for this tag, and call its parse function.
718 * The tag table is built by the linker from all the __tagtable
721 static int __init parse_tag(const struct tag *tag)
723 extern struct tagtable __tagtable_begin, __tagtable_end;
726 for (t = &__tagtable_begin; t < &__tagtable_end; t++)
727 if (tag->hdr.tag == t->tag) {
732 return t < &__tagtable_end;
736 * Parse all tags in the list, checking both the global and architecture
737 * specific tag tables.
739 static void __init parse_tags(const struct tag *t)
741 for (; t->hdr.size; t = tag_next(t))
744 "Ignoring unrecognised tag 0x%08x\n",
749 * This holds our defaults.
751 static struct init_tags {
752 struct tag_header hdr1;
753 struct tag_core core;
754 struct tag_header hdr2;
755 struct tag_mem32 mem;
756 struct tag_header hdr3;
757 } init_tags __initdata = {
758 { tag_size(tag_core), ATAG_CORE },
759 { 1, PAGE_SIZE, 0xff },
760 { tag_size(tag_mem32), ATAG_MEM },
765 static int __init customize_machine(void)
767 /* customizes platform devices, or adds new ones */
768 if (machine_desc->init_machine)
769 machine_desc->init_machine();
772 arch_initcall(customize_machine);
775 static inline unsigned long long get_total_mem(void)
779 total = max_low_pfn - min_low_pfn;
780 return total << PAGE_SHIFT;
784 * reserve_crashkernel() - reserves memory are for crash kernel
786 * This function reserves memory area given in "crashkernel=" kernel command
787 * line parameter. The memory reserved is used by a dump capture kernel when
788 * primary kernel is crashing.
790 static void __init reserve_crashkernel(void)
792 unsigned long long crash_size, crash_base;
793 unsigned long long total_mem;
796 total_mem = get_total_mem();
797 ret = parse_crashkernel(boot_command_line, total_mem,
798 &crash_size, &crash_base);
802 ret = reserve_bootmem(crash_base, crash_size, BOOTMEM_EXCLUSIVE);
804 printk(KERN_WARNING "crashkernel reservation failed - "
805 "memory is in use (0x%lx)\n", (unsigned long)crash_base);
809 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
810 "for crashkernel (System RAM: %ldMB)\n",
811 (unsigned long)(crash_size >> 20),
812 (unsigned long)(crash_base >> 20),
813 (unsigned long)(total_mem >> 20));
815 crashk_res.start = crash_base;
816 crashk_res.end = crash_base + crash_size - 1;
817 insert_resource(&iomem_resource, &crashk_res);
820 static inline void reserve_crashkernel(void) {}
821 #endif /* CONFIG_KEXEC */
823 static void __init squash_mem_tags(struct tag *tag)
825 for (; tag->hdr.size; tag = tag_next(tag))
826 if (tag->hdr.tag == ATAG_MEM)
827 tag->hdr.tag = ATAG_NONE;
830 static struct machine_desc * __init setup_machine_tags(unsigned int nr)
832 struct tag *tags = (struct tag *)&init_tags;
833 struct machine_desc *mdesc = NULL, *p;
834 char *from = default_command_line;
836 init_tags.mem.start = PHYS_OFFSET;
839 * locate machine in the list of supported machines.
841 for_each_machine_desc(p)
843 printk("Machine: %s\n", p->name);
849 early_print("\nError: unrecognized/unsupported machine ID"
850 " (r1 = 0x%08x).\n\n", nr);
851 dump_machine_table(); /* does not return */
855 tags = phys_to_virt(__atags_pointer);
856 else if (mdesc->atag_offset)
857 tags = (void *)(PAGE_OFFSET + mdesc->atag_offset);
859 #if defined(CONFIG_DEPRECATED_PARAM_STRUCT)
861 * If we have the old style parameters, convert them to
864 if (tags->hdr.tag != ATAG_CORE)
865 convert_to_tag_list(tags);
868 if (tags->hdr.tag != ATAG_CORE) {
869 #if defined(CONFIG_OF)
871 * If CONFIG_OF is set, then assume this is a reasonably
872 * modern system that should pass boot parameters
874 early_print("Warning: Neither atags nor dtb found\n");
876 tags = (struct tag *)&init_tags;
880 mdesc->fixup(tags, &from, &meminfo);
882 if (tags->hdr.tag == ATAG_CORE) {
883 if (meminfo.nr_banks != 0)
884 squash_mem_tags(tags);
889 /* parse_early_param needs a boot_command_line */
890 strlcpy(boot_command_line, from, COMMAND_LINE_SIZE);
895 static int __init meminfo_cmp(const void *_a, const void *_b)
897 const struct membank *a = _a, *b = _b;
898 long cmp = bank_pfn_start(a) - bank_pfn_start(b);
899 return cmp < 0 ? -1 : cmp > 0 ? 1 : 0;
902 void __init setup_arch(char **cmdline_p)
904 struct machine_desc *mdesc;
907 mdesc = setup_machine_fdt(__atags_pointer);
909 mdesc = setup_machine_tags(machine_arch_type);
910 machine_desc = mdesc;
911 machine_name = mdesc->name;
913 #ifdef CONFIG_ZONE_DMA
914 if (mdesc->dma_zone_size) {
915 extern unsigned long arm_dma_zone_size;
916 arm_dma_zone_size = mdesc->dma_zone_size;
919 if (mdesc->restart_mode)
920 reboot_setup(&mdesc->restart_mode);
922 init_mm.start_code = (unsigned long) _text;
923 init_mm.end_code = (unsigned long) _etext;
924 init_mm.end_data = (unsigned long) _edata;
925 init_mm.brk = (unsigned long) _end;
927 /* populate cmd_line too for later use, preserving boot_command_line */
928 strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);
929 *cmdline_p = cmd_line;
933 sort(&meminfo.bank, meminfo.nr_banks, sizeof(meminfo.bank[0]), meminfo_cmp, NULL);
934 sanity_check_meminfo();
935 arm_memblock_init(&meminfo, mdesc);
938 request_standard_resources(mdesc);
941 arm_pm_restart = mdesc->restart;
943 unflatten_device_tree();
949 reserve_crashkernel();
953 #ifdef CONFIG_MULTI_IRQ_HANDLER
954 handle_arch_irq = mdesc->handle_irq;
958 #if defined(CONFIG_VGA_CONSOLE)
959 conswitchp = &vga_con;
960 #elif defined(CONFIG_DUMMY_CONSOLE)
961 conswitchp = &dummy_con;
966 if (mdesc->init_early)
971 static int __init topology_init(void)
975 for_each_possible_cpu(cpu) {
976 struct cpuinfo_arm *cpuinfo = &per_cpu(cpu_data, cpu);
977 cpuinfo->cpu.hotpluggable = 1;
978 register_cpu(&cpuinfo->cpu, cpu);
983 subsys_initcall(topology_init);
985 #ifdef CONFIG_HAVE_PROC_CPU
986 static int __init proc_cpu_init(void)
988 struct proc_dir_entry *res;
990 res = proc_mkdir("cpu", NULL);
995 fs_initcall(proc_cpu_init);
998 static const char *hwcap_str[] = {
1021 static int c_show(struct seq_file *m, void *v)
1025 seq_printf(m, "Processor\t: %s rev %d (%s)\n",
1026 cpu_name, read_cpuid_id() & 15, elf_platform);
1028 #if defined(CONFIG_SMP)
1029 for_each_online_cpu(i) {
1031 * glibc reads /proc/cpuinfo to determine the number of
1032 * online processors, looking for lines beginning with
1033 * "processor". Give glibc what it expects.
1035 seq_printf(m, "processor\t: %d\n", i);
1036 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n",
1037 per_cpu(cpu_data, i).loops_per_jiffy / (500000UL/HZ),
1038 (per_cpu(cpu_data, i).loops_per_jiffy / (5000UL/HZ)) % 100);
1040 #else /* CONFIG_SMP */
1041 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
1042 loops_per_jiffy / (500000/HZ),
1043 (loops_per_jiffy / (5000/HZ)) % 100);
1046 /* dump out the processor features */
1047 seq_puts(m, "Features\t: ");
1049 for (i = 0; hwcap_str[i]; i++)
1050 if (elf_hwcap & (1 << i))
1051 seq_printf(m, "%s ", hwcap_str[i]);
1053 seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24);
1054 seq_printf(m, "CPU architecture: %s\n", proc_arch[cpu_architecture()]);
1056 if ((read_cpuid_id() & 0x0008f000) == 0x00000000) {
1058 seq_printf(m, "CPU part\t: %07x\n", read_cpuid_id() >> 4);
1060 if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
1062 seq_printf(m, "CPU variant\t: 0x%02x\n",
1063 (read_cpuid_id() >> 16) & 127);
1066 seq_printf(m, "CPU variant\t: 0x%x\n",
1067 (read_cpuid_id() >> 20) & 15);
1069 seq_printf(m, "CPU part\t: 0x%03x\n",
1070 (read_cpuid_id() >> 4) & 0xfff);
1072 seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15);
1076 seq_printf(m, "Hardware\t: %s\n", machine_name);
1077 seq_printf(m, "Revision\t: %04x\n", system_rev);
1078 seq_printf(m, "Serial\t\t: %08x%08x\n",
1079 system_serial_high, system_serial_low);
1084 static void *c_start(struct seq_file *m, loff_t *pos)
1086 return *pos < 1 ? (void *)1 : NULL;
1089 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
1095 static void c_stop(struct seq_file *m, void *v)
1099 const struct seq_operations cpuinfo_op = {