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/module.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>
35 #include <asm/unified.h>
37 #include <asm/cputype.h>
39 #include <asm/procinfo.h>
40 #include <asm/sections.h>
41 #include <asm/setup.h>
42 #include <asm/smp_plat.h>
43 #include <asm/mach-types.h>
44 #include <asm/cacheflush.h>
45 #include <asm/cachetype.h>
46 #include <asm/tlbflush.h>
47 #include <asm/system.h>
50 #include <asm/mach/arch.h>
51 #include <asm/mach/irq.h>
52 #include <asm/mach/time.h>
53 #include <asm/traps.h>
54 #include <asm/unwind.h>
56 #if defined(CONFIG_DEPRECATED_PARAM_STRUCT)
63 #define MEM_SIZE (16*1024*1024)
66 #if defined(CONFIG_FPE_NWFPE) || defined(CONFIG_FPE_FASTFPE)
69 static int __init fpe_setup(char *line)
71 memcpy(fpe_type, line, 8);
75 __setup("fpe=", fpe_setup);
78 extern void paging_init(struct machine_desc *desc);
79 extern void sanity_check_meminfo(void);
80 extern void reboot_setup(char *str);
82 unsigned int processor_id;
83 EXPORT_SYMBOL(processor_id);
84 unsigned int __machine_arch_type __read_mostly;
85 EXPORT_SYMBOL(__machine_arch_type);
86 unsigned int cacheid __read_mostly;
87 EXPORT_SYMBOL(cacheid);
89 unsigned int __atags_pointer __initdata;
91 unsigned int system_rev;
92 EXPORT_SYMBOL(system_rev);
94 unsigned int system_serial_low;
95 EXPORT_SYMBOL(system_serial_low);
97 unsigned int system_serial_high;
98 EXPORT_SYMBOL(system_serial_high);
100 unsigned int elf_hwcap __read_mostly;
101 EXPORT_SYMBOL(elf_hwcap);
105 struct processor processor __read_mostly;
108 struct cpu_tlb_fns cpu_tlb __read_mostly;
111 struct cpu_user_fns cpu_user __read_mostly;
114 struct cpu_cache_fns cpu_cache __read_mostly;
116 #ifdef CONFIG_OUTER_CACHE
117 struct outer_cache_fns outer_cache __read_mostly;
118 EXPORT_SYMBOL(outer_cache);
122 * Cached cpu_architecture() result for use by assembler code.
123 * C code should use the cpu_architecture() function instead of accessing this
126 int __cpu_architecture __read_mostly = CPU_ARCH_UNKNOWN;
132 } ____cacheline_aligned;
134 static struct stack stacks[NR_CPUS];
136 char elf_platform[ELF_PLATFORM_SIZE];
137 EXPORT_SYMBOL(elf_platform);
139 static const char *cpu_name;
140 static const char *machine_name;
141 static char __initdata cmd_line[COMMAND_LINE_SIZE];
142 struct machine_desc *machine_desc __initdata;
144 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
145 static union { char c[4]; unsigned long l; } endian_test __initdata = { { 'l', '?', '?', 'b' } };
146 #define ENDIANNESS ((char)endian_test.l)
148 DEFINE_PER_CPU(struct cpuinfo_arm, cpu_data);
151 * Standard memory resources
153 static struct resource mem_res[] = {
158 .flags = IORESOURCE_MEM
161 .name = "Kernel text",
164 .flags = IORESOURCE_MEM
167 .name = "Kernel data",
170 .flags = IORESOURCE_MEM
174 #define video_ram mem_res[0]
175 #define kernel_code mem_res[1]
176 #define kernel_data mem_res[2]
178 static struct resource io_res[] = {
183 .flags = IORESOURCE_IO | IORESOURCE_BUSY
189 .flags = IORESOURCE_IO | IORESOURCE_BUSY
195 .flags = IORESOURCE_IO | IORESOURCE_BUSY
199 #define lp0 io_res[0]
200 #define lp1 io_res[1]
201 #define lp2 io_res[2]
203 static const char *proc_arch[] = {
223 static int __get_cpu_architecture(void)
227 if ((read_cpuid_id() & 0x0008f000) == 0) {
228 cpu_arch = CPU_ARCH_UNKNOWN;
229 } else if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
230 cpu_arch = (read_cpuid_id() & (1 << 23)) ? CPU_ARCH_ARMv4T : CPU_ARCH_ARMv3;
231 } else if ((read_cpuid_id() & 0x00080000) == 0x00000000) {
232 cpu_arch = (read_cpuid_id() >> 16) & 7;
234 cpu_arch += CPU_ARCH_ARMv3;
235 } else if ((read_cpuid_id() & 0x000f0000) == 0x000f0000) {
238 /* Revised CPUID format. Read the Memory Model Feature
239 * Register 0 and check for VMSAv7 or PMSAv7 */
240 asm("mrc p15, 0, %0, c0, c1, 4"
242 if ((mmfr0 & 0x0000000f) >= 0x00000003 ||
243 (mmfr0 & 0x000000f0) >= 0x00000030)
244 cpu_arch = CPU_ARCH_ARMv7;
245 else if ((mmfr0 & 0x0000000f) == 0x00000002 ||
246 (mmfr0 & 0x000000f0) == 0x00000020)
247 cpu_arch = CPU_ARCH_ARMv6;
249 cpu_arch = CPU_ARCH_UNKNOWN;
251 cpu_arch = CPU_ARCH_UNKNOWN;
256 int __pure cpu_architecture(void)
258 BUG_ON(__cpu_architecture == CPU_ARCH_UNKNOWN);
260 return __cpu_architecture;
263 static int cpu_has_aliasing_icache(unsigned int arch)
266 unsigned int id_reg, num_sets, line_size;
268 /* arch specifies the register format */
271 asm("mcr p15, 2, %0, c0, c0, 0 @ set CSSELR"
272 : /* No output operands */
275 asm("mrc p15, 1, %0, c0, c0, 0 @ read CCSIDR"
277 line_size = 4 << ((id_reg & 0x7) + 2);
278 num_sets = ((id_reg >> 13) & 0x7fff) + 1;
279 aliasing_icache = (line_size * num_sets) > PAGE_SIZE;
282 aliasing_icache = read_cpuid_cachetype() & (1 << 11);
285 /* I-cache aliases will be handled by D-cache aliasing code */
289 return aliasing_icache;
292 static void __init cacheid_init(void)
294 unsigned int cachetype = read_cpuid_cachetype();
295 unsigned int arch = cpu_architecture();
297 if (arch >= CPU_ARCH_ARMv6) {
298 if ((cachetype & (7 << 29)) == 4 << 29) {
299 /* ARMv7 register format */
300 arch = CPU_ARCH_ARMv7;
301 cacheid = CACHEID_VIPT_NONALIASING;
302 if ((cachetype & (3 << 14)) == 1 << 14)
303 cacheid |= CACHEID_ASID_TAGGED;
305 arch = CPU_ARCH_ARMv6;
306 if (cachetype & (1 << 23))
307 cacheid = CACHEID_VIPT_ALIASING;
309 cacheid = CACHEID_VIPT_NONALIASING;
311 if (cpu_has_aliasing_icache(arch))
312 cacheid |= CACHEID_VIPT_I_ALIASING;
314 cacheid = CACHEID_VIVT;
317 printk("CPU: %s data cache, %s instruction cache\n",
318 cache_is_vivt() ? "VIVT" :
319 cache_is_vipt_aliasing() ? "VIPT aliasing" :
320 cache_is_vipt_nonaliasing() ? "VIPT nonaliasing" : "unknown",
321 cache_is_vivt() ? "VIVT" :
322 icache_is_vivt_asid_tagged() ? "VIVT ASID tagged" :
323 icache_is_vipt_aliasing() ? "VIPT aliasing" :
324 cache_is_vipt_nonaliasing() ? "VIPT nonaliasing" : "unknown");
328 * These functions re-use the assembly code in head.S, which
329 * already provide the required functionality.
331 extern struct proc_info_list *lookup_processor_type(unsigned int);
333 void __init early_print(const char *str, ...)
335 extern void printascii(const char *);
340 vsnprintf(buf, sizeof(buf), str, ap);
343 #ifdef CONFIG_DEBUG_LL
349 static void __init feat_v6_fixup(void)
351 int id = read_cpuid_id();
353 if ((id & 0xff0f0000) != 0x41070000)
357 * HWCAP_TLS is available only on 1136 r1p0 and later,
358 * see also kuser_get_tls_init.
360 if ((((id >> 4) & 0xfff) == 0xb36) && (((id >> 20) & 3) == 0))
361 elf_hwcap &= ~HWCAP_TLS;
365 * cpu_init - initialise one CPU.
367 * cpu_init sets up the per-CPU stacks.
371 unsigned int cpu = smp_processor_id();
372 struct stack *stk = &stacks[cpu];
374 if (cpu >= NR_CPUS) {
375 printk(KERN_CRIT "CPU%u: bad primary CPU number\n", cpu);
382 * Define the placement constraint for the inline asm directive below.
383 * In Thumb-2, msr with an immediate value is not allowed.
385 #ifdef CONFIG_THUMB2_KERNEL
392 * setup stacks for re-entrant exception handlers
396 "add r14, %0, %2\n\t"
399 "add r14, %0, %4\n\t"
402 "add r14, %0, %6\n\t"
407 PLC (PSR_F_BIT | PSR_I_BIT | IRQ_MODE),
408 "I" (offsetof(struct stack, irq[0])),
409 PLC (PSR_F_BIT | PSR_I_BIT | ABT_MODE),
410 "I" (offsetof(struct stack, abt[0])),
411 PLC (PSR_F_BIT | PSR_I_BIT | UND_MODE),
412 "I" (offsetof(struct stack, und[0])),
413 PLC (PSR_F_BIT | PSR_I_BIT | SVC_MODE)
417 static void __init setup_processor(void)
419 struct proc_info_list *list;
422 * locate processor in the list of supported processor
423 * types. The linker builds this table for us from the
424 * entries in arch/arm/mm/proc-*.S
426 list = lookup_processor_type(read_cpuid_id());
428 printk("CPU configuration botched (ID %08x), unable "
429 "to continue.\n", read_cpuid_id());
433 cpu_name = list->cpu_name;
434 __cpu_architecture = __get_cpu_architecture();
437 processor = *list->proc;
440 cpu_tlb = *list->tlb;
443 cpu_user = *list->user;
446 cpu_cache = *list->cache;
449 printk("CPU: %s [%08x] revision %d (ARMv%s), cr=%08lx\n",
450 cpu_name, read_cpuid_id(), read_cpuid_id() & 15,
451 proc_arch[cpu_architecture()], cr_alignment);
453 sprintf(init_utsname()->machine, "%s%c", list->arch_name, ENDIANNESS);
454 sprintf(elf_platform, "%s%c", list->elf_name, ENDIANNESS);
455 elf_hwcap = list->elf_hwcap;
456 #ifndef CONFIG_ARM_THUMB
457 elf_hwcap &= ~HWCAP_THUMB;
466 void __init dump_machine_table(void)
468 struct machine_desc *p;
470 early_print("Available machine support:\n\nID (hex)\tNAME\n");
471 for_each_machine_desc(p)
472 early_print("%08x\t%s\n", p->nr, p->name);
474 early_print("\nPlease check your kernel config and/or bootloader.\n");
477 /* can't use cpu_relax() here as it may require MMU setup */;
480 int __init arm_add_memory(phys_addr_t start, unsigned long size)
482 struct membank *bank = &meminfo.bank[meminfo.nr_banks];
484 if (meminfo.nr_banks >= NR_BANKS) {
485 printk(KERN_CRIT "NR_BANKS too low, "
486 "ignoring memory at 0x%08llx\n", (long long)start);
491 * Ensure that start/size are aligned to a page boundary.
492 * Size is appropriately rounded down, start is rounded up.
494 size -= start & ~PAGE_MASK;
495 bank->start = PAGE_ALIGN(start);
496 bank->size = size & PAGE_MASK;
499 * Check whether this memory region has non-zero size or
500 * invalid node number.
510 * Pick out the memory size. We look for mem=size@start,
511 * where start and size are "size[KkMm]"
513 static int __init early_mem(char *p)
515 static int usermem __initdata = 0;
521 * If the user specifies memory size, we
522 * blow away any automatically generated
527 meminfo.nr_banks = 0;
531 size = memparse(p, &endp);
533 start = memparse(endp + 1, NULL);
535 arm_add_memory(start, size);
539 early_param("mem", early_mem);
542 setup_ramdisk(int doload, int prompt, int image_start, unsigned int rd_sz)
544 #ifdef CONFIG_BLK_DEV_RAM
545 extern int rd_size, rd_image_start, rd_prompt, rd_doload;
547 rd_image_start = image_start;
556 static void __init request_standard_resources(struct machine_desc *mdesc)
558 struct memblock_region *region;
559 struct resource *res;
561 kernel_code.start = virt_to_phys(_text);
562 kernel_code.end = virt_to_phys(_etext - 1);
563 kernel_data.start = virt_to_phys(_sdata);
564 kernel_data.end = virt_to_phys(_end - 1);
566 for_each_memblock(memory, region) {
567 res = alloc_bootmem_low(sizeof(*res));
568 res->name = "System RAM";
569 res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
570 res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
571 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
573 request_resource(&iomem_resource, res);
575 if (kernel_code.start >= res->start &&
576 kernel_code.end <= res->end)
577 request_resource(res, &kernel_code);
578 if (kernel_data.start >= res->start &&
579 kernel_data.end <= res->end)
580 request_resource(res, &kernel_data);
583 if (mdesc->video_start) {
584 video_ram.start = mdesc->video_start;
585 video_ram.end = mdesc->video_end;
586 request_resource(&iomem_resource, &video_ram);
590 * Some machines don't have the possibility of ever
591 * possessing lp0, lp1 or lp2
593 if (mdesc->reserve_lp0)
594 request_resource(&ioport_resource, &lp0);
595 if (mdesc->reserve_lp1)
596 request_resource(&ioport_resource, &lp1);
597 if (mdesc->reserve_lp2)
598 request_resource(&ioport_resource, &lp2);
604 * This is the new way of passing data to the kernel at boot time. Rather
605 * than passing a fixed inflexible structure to the kernel, we pass a list
606 * of variable-sized tags to the kernel. The first tag must be a ATAG_CORE
607 * tag for the list to be recognised (to distinguish the tagged list from
608 * a param_struct). The list is terminated with a zero-length tag (this tag
609 * is not parsed in any way).
611 static int __init parse_tag_core(const struct tag *tag)
613 if (tag->hdr.size > 2) {
614 if ((tag->u.core.flags & 1) == 0)
615 root_mountflags &= ~MS_RDONLY;
616 ROOT_DEV = old_decode_dev(tag->u.core.rootdev);
621 __tagtable(ATAG_CORE, parse_tag_core);
623 static int __init parse_tag_mem32(const struct tag *tag)
625 return arm_add_memory(tag->u.mem.start, tag->u.mem.size);
628 __tagtable(ATAG_MEM, parse_tag_mem32);
630 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
631 struct screen_info screen_info = {
632 .orig_video_lines = 30,
633 .orig_video_cols = 80,
634 .orig_video_mode = 0,
635 .orig_video_ega_bx = 0,
636 .orig_video_isVGA = 1,
637 .orig_video_points = 8
640 static int __init parse_tag_videotext(const struct tag *tag)
642 screen_info.orig_x = tag->u.videotext.x;
643 screen_info.orig_y = tag->u.videotext.y;
644 screen_info.orig_video_page = tag->u.videotext.video_page;
645 screen_info.orig_video_mode = tag->u.videotext.video_mode;
646 screen_info.orig_video_cols = tag->u.videotext.video_cols;
647 screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx;
648 screen_info.orig_video_lines = tag->u.videotext.video_lines;
649 screen_info.orig_video_isVGA = tag->u.videotext.video_isvga;
650 screen_info.orig_video_points = tag->u.videotext.video_points;
654 __tagtable(ATAG_VIDEOTEXT, parse_tag_videotext);
657 static int __init parse_tag_ramdisk(const struct tag *tag)
659 setup_ramdisk((tag->u.ramdisk.flags & 1) == 0,
660 (tag->u.ramdisk.flags & 2) == 0,
661 tag->u.ramdisk.start, tag->u.ramdisk.size);
665 __tagtable(ATAG_RAMDISK, parse_tag_ramdisk);
667 static int __init parse_tag_serialnr(const struct tag *tag)
669 system_serial_low = tag->u.serialnr.low;
670 system_serial_high = tag->u.serialnr.high;
674 __tagtable(ATAG_SERIAL, parse_tag_serialnr);
676 static int __init parse_tag_revision(const struct tag *tag)
678 system_rev = tag->u.revision.rev;
682 __tagtable(ATAG_REVISION, parse_tag_revision);
684 static int __init parse_tag_cmdline(const struct tag *tag)
686 #if defined(CONFIG_CMDLINE_EXTEND)
687 strlcat(default_command_line, " ", COMMAND_LINE_SIZE);
688 strlcat(default_command_line, tag->u.cmdline.cmdline,
690 #elif defined(CONFIG_CMDLINE_FORCE)
691 pr_warning("Ignoring tag cmdline (using the default kernel command line)\n");
693 strlcpy(default_command_line, tag->u.cmdline.cmdline,
699 __tagtable(ATAG_CMDLINE, parse_tag_cmdline);
702 * Scan the tag table for this tag, and call its parse function.
703 * The tag table is built by the linker from all the __tagtable
706 static int __init parse_tag(const struct tag *tag)
708 extern struct tagtable __tagtable_begin, __tagtable_end;
711 for (t = &__tagtable_begin; t < &__tagtable_end; t++)
712 if (tag->hdr.tag == t->tag) {
717 return t < &__tagtable_end;
721 * Parse all tags in the list, checking both the global and architecture
722 * specific tag tables.
724 static void __init parse_tags(const struct tag *t)
726 for (; t->hdr.size; t = tag_next(t))
729 "Ignoring unrecognised tag 0x%08x\n",
734 * This holds our defaults.
736 static struct init_tags {
737 struct tag_header hdr1;
738 struct tag_core core;
739 struct tag_header hdr2;
740 struct tag_mem32 mem;
741 struct tag_header hdr3;
742 } init_tags __initdata = {
743 { tag_size(tag_core), ATAG_CORE },
744 { 1, PAGE_SIZE, 0xff },
745 { tag_size(tag_mem32), ATAG_MEM },
750 static int __init customize_machine(void)
752 /* customizes platform devices, or adds new ones */
753 if (machine_desc->init_machine)
754 machine_desc->init_machine();
757 arch_initcall(customize_machine);
760 static inline unsigned long long get_total_mem(void)
764 total = max_low_pfn - min_low_pfn;
765 return total << PAGE_SHIFT;
769 * reserve_crashkernel() - reserves memory are for crash kernel
771 * This function reserves memory area given in "crashkernel=" kernel command
772 * line parameter. The memory reserved is used by a dump capture kernel when
773 * primary kernel is crashing.
775 static void __init reserve_crashkernel(void)
777 unsigned long long crash_size, crash_base;
778 unsigned long long total_mem;
781 total_mem = get_total_mem();
782 ret = parse_crashkernel(boot_command_line, total_mem,
783 &crash_size, &crash_base);
787 ret = reserve_bootmem(crash_base, crash_size, BOOTMEM_EXCLUSIVE);
789 printk(KERN_WARNING "crashkernel reservation failed - "
790 "memory is in use (0x%lx)\n", (unsigned long)crash_base);
794 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
795 "for crashkernel (System RAM: %ldMB)\n",
796 (unsigned long)(crash_size >> 20),
797 (unsigned long)(crash_base >> 20),
798 (unsigned long)(total_mem >> 20));
800 crashk_res.start = crash_base;
801 crashk_res.end = crash_base + crash_size - 1;
802 insert_resource(&iomem_resource, &crashk_res);
805 static inline void reserve_crashkernel(void) {}
806 #endif /* CONFIG_KEXEC */
808 static void __init squash_mem_tags(struct tag *tag)
810 for (; tag->hdr.size; tag = tag_next(tag))
811 if (tag->hdr.tag == ATAG_MEM)
812 tag->hdr.tag = ATAG_NONE;
815 static struct machine_desc * __init setup_machine_tags(unsigned int nr)
817 struct tag *tags = (struct tag *)&init_tags;
818 struct machine_desc *mdesc = NULL, *p;
819 char *from = default_command_line;
821 init_tags.mem.start = PHYS_OFFSET;
824 * locate machine in the list of supported machines.
826 for_each_machine_desc(p)
828 printk("Machine: %s\n", p->name);
834 early_print("\nError: unrecognized/unsupported machine ID"
835 " (r1 = 0x%08x).\n\n", nr);
836 dump_machine_table(); /* does not return */
840 tags = phys_to_virt(__atags_pointer);
841 else if (mdesc->atag_offset)
842 tags = (void *)(PAGE_OFFSET + mdesc->atag_offset);
844 #if defined(CONFIG_DEPRECATED_PARAM_STRUCT)
846 * If we have the old style parameters, convert them to
849 if (tags->hdr.tag != ATAG_CORE)
850 convert_to_tag_list(tags);
853 if (tags->hdr.tag != ATAG_CORE) {
854 #if defined(CONFIG_OF)
856 * If CONFIG_OF is set, then assume this is a reasonably
857 * modern system that should pass boot parameters
859 early_print("Warning: Neither atags nor dtb found\n");
861 tags = (struct tag *)&init_tags;
865 mdesc->fixup(mdesc, tags, &from, &meminfo);
867 if (tags->hdr.tag == ATAG_CORE) {
868 if (meminfo.nr_banks != 0)
869 squash_mem_tags(tags);
874 /* parse_early_param needs a boot_command_line */
875 strlcpy(boot_command_line, from, COMMAND_LINE_SIZE);
881 void __init setup_arch(char **cmdline_p)
883 struct machine_desc *mdesc;
888 mdesc = setup_machine_fdt(__atags_pointer);
890 mdesc = setup_machine_tags(machine_arch_type);
891 machine_desc = mdesc;
892 machine_name = mdesc->name;
894 if (mdesc->soft_reboot)
897 init_mm.start_code = (unsigned long) _text;
898 init_mm.end_code = (unsigned long) _etext;
899 init_mm.end_data = (unsigned long) _edata;
900 init_mm.brk = (unsigned long) _end;
902 /* populate cmd_line too for later use, preserving boot_command_line */
903 strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);
904 *cmdline_p = cmd_line;
908 sanity_check_meminfo();
909 arm_memblock_init(&meminfo, mdesc);
912 request_standard_resources(mdesc);
914 unflatten_device_tree();
920 reserve_crashkernel();
924 #ifdef CONFIG_ZONE_DMA
925 if (mdesc->dma_zone_size) {
926 extern unsigned long arm_dma_zone_size;
927 arm_dma_zone_size = mdesc->dma_zone_size;
930 #ifdef CONFIG_MULTI_IRQ_HANDLER
931 handle_arch_irq = mdesc->handle_irq;
935 #if defined(CONFIG_VGA_CONSOLE)
936 conswitchp = &vga_con;
937 #elif defined(CONFIG_DUMMY_CONSOLE)
938 conswitchp = &dummy_con;
943 if (mdesc->init_early)
948 static int __init topology_init(void)
952 for_each_possible_cpu(cpu) {
953 struct cpuinfo_arm *cpuinfo = &per_cpu(cpu_data, cpu);
954 cpuinfo->cpu.hotpluggable = 1;
955 register_cpu(&cpuinfo->cpu, cpu);
960 subsys_initcall(topology_init);
962 #ifdef CONFIG_HAVE_PROC_CPU
963 static int __init proc_cpu_init(void)
965 struct proc_dir_entry *res;
967 res = proc_mkdir("cpu", NULL);
972 fs_initcall(proc_cpu_init);
975 static const char *hwcap_str[] = {
998 static int c_show(struct seq_file *m, void *v)
1002 seq_printf(m, "Processor\t: %s rev %d (%s)\n",
1003 cpu_name, read_cpuid_id() & 15, elf_platform);
1005 #if defined(CONFIG_SMP)
1006 for_each_online_cpu(i) {
1008 * glibc reads /proc/cpuinfo to determine the number of
1009 * online processors, looking for lines beginning with
1010 * "processor". Give glibc what it expects.
1012 seq_printf(m, "processor\t: %d\n", i);
1013 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n",
1014 per_cpu(cpu_data, i).loops_per_jiffy / (500000UL/HZ),
1015 (per_cpu(cpu_data, i).loops_per_jiffy / (5000UL/HZ)) % 100);
1017 #else /* CONFIG_SMP */
1018 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
1019 loops_per_jiffy / (500000/HZ),
1020 (loops_per_jiffy / (5000/HZ)) % 100);
1023 /* dump out the processor features */
1024 seq_puts(m, "Features\t: ");
1026 for (i = 0; hwcap_str[i]; i++)
1027 if (elf_hwcap & (1 << i))
1028 seq_printf(m, "%s ", hwcap_str[i]);
1030 seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24);
1031 seq_printf(m, "CPU architecture: %s\n", proc_arch[cpu_architecture()]);
1033 if ((read_cpuid_id() & 0x0008f000) == 0x00000000) {
1035 seq_printf(m, "CPU part\t: %07x\n", read_cpuid_id() >> 4);
1037 if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
1039 seq_printf(m, "CPU variant\t: 0x%02x\n",
1040 (read_cpuid_id() >> 16) & 127);
1043 seq_printf(m, "CPU variant\t: 0x%x\n",
1044 (read_cpuid_id() >> 20) & 15);
1046 seq_printf(m, "CPU part\t: 0x%03x\n",
1047 (read_cpuid_id() >> 4) & 0xfff);
1049 seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15);
1053 seq_printf(m, "Hardware\t: %s\n", machine_name);
1054 seq_printf(m, "Revision\t: %04x\n", system_rev);
1055 seq_printf(m, "Serial\t\t: %08x%08x\n",
1056 system_serial_high, system_serial_low);
1061 static void *c_start(struct seq_file *m, loff_t *pos)
1063 return *pos < 1 ? (void *)1 : NULL;
1066 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
1072 static void c_stop(struct seq_file *m, void *v)
1076 const struct seq_operations cpuinfo_op = {