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>
33 #include <asm/unified.h>
35 #include <asm/cputype.h>
37 #include <asm/procinfo.h>
38 #include <asm/sections.h>
39 #include <asm/setup.h>
40 #include <asm/smp_plat.h>
41 #include <asm/mach-types.h>
42 #include <asm/cacheflush.h>
43 #include <asm/cachetype.h>
44 #include <asm/tlbflush.h>
47 #include <asm/mach/arch.h>
48 #include <asm/mach/irq.h>
49 #include <asm/mach/time.h>
50 #include <asm/traps.h>
51 #include <asm/unwind.h>
53 #if defined(CONFIG_DEPRECATED_PARAM_STRUCT)
60 #define MEM_SIZE (16*1024*1024)
63 #if defined(CONFIG_FPE_NWFPE) || defined(CONFIG_FPE_FASTFPE)
66 static int __init fpe_setup(char *line)
68 memcpy(fpe_type, line, 8);
72 __setup("fpe=", fpe_setup);
75 extern void paging_init(struct machine_desc *desc);
76 extern void sanity_check_meminfo(void);
77 extern void reboot_setup(char *str);
79 unsigned int processor_id;
80 EXPORT_SYMBOL(processor_id);
81 unsigned int __machine_arch_type __read_mostly;
82 EXPORT_SYMBOL(__machine_arch_type);
83 unsigned int cacheid __read_mostly;
84 EXPORT_SYMBOL(cacheid);
86 unsigned int __atags_pointer __initdata;
88 unsigned int system_rev;
89 EXPORT_SYMBOL(system_rev);
91 unsigned int system_serial_low;
92 EXPORT_SYMBOL(system_serial_low);
94 unsigned int system_serial_high;
95 EXPORT_SYMBOL(system_serial_high);
97 unsigned int elf_hwcap __read_mostly;
98 EXPORT_SYMBOL(elf_hwcap);
102 struct processor processor __read_mostly;
105 struct cpu_tlb_fns cpu_tlb __read_mostly;
108 struct cpu_user_fns cpu_user __read_mostly;
111 struct cpu_cache_fns cpu_cache __read_mostly;
113 #ifdef CONFIG_OUTER_CACHE
114 struct outer_cache_fns outer_cache __read_mostly;
115 EXPORT_SYMBOL(outer_cache);
122 } ____cacheline_aligned;
124 static struct stack stacks[NR_CPUS];
126 char elf_platform[ELF_PLATFORM_SIZE];
127 EXPORT_SYMBOL(elf_platform);
129 static const char *cpu_name;
130 static const char *machine_name;
131 static char __initdata cmd_line[COMMAND_LINE_SIZE];
132 struct machine_desc *machine_desc __initdata;
134 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
135 static union { char c[4]; unsigned long l; } endian_test __initdata = { { 'l', '?', '?', 'b' } };
136 #define ENDIANNESS ((char)endian_test.l)
138 DEFINE_PER_CPU(struct cpuinfo_arm, cpu_data);
141 * Standard memory resources
143 static struct resource mem_res[] = {
148 .flags = IORESOURCE_MEM
151 .name = "Kernel text",
154 .flags = IORESOURCE_MEM
157 .name = "Kernel data",
160 .flags = IORESOURCE_MEM
164 #define video_ram mem_res[0]
165 #define kernel_code mem_res[1]
166 #define kernel_data mem_res[2]
168 static struct resource io_res[] = {
173 .flags = IORESOURCE_IO | IORESOURCE_BUSY
179 .flags = IORESOURCE_IO | IORESOURCE_BUSY
185 .flags = IORESOURCE_IO | IORESOURCE_BUSY
189 #define lp0 io_res[0]
190 #define lp1 io_res[1]
191 #define lp2 io_res[2]
193 static const char *proc_arch[] = {
213 int cpu_architecture(void)
217 if ((read_cpuid_id() & 0x0008f000) == 0) {
218 cpu_arch = CPU_ARCH_UNKNOWN;
219 } else if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
220 cpu_arch = (read_cpuid_id() & (1 << 23)) ? CPU_ARCH_ARMv4T : CPU_ARCH_ARMv3;
221 } else if ((read_cpuid_id() & 0x00080000) == 0x00000000) {
222 cpu_arch = (read_cpuid_id() >> 16) & 7;
224 cpu_arch += CPU_ARCH_ARMv3;
225 } else if ((read_cpuid_id() & 0x000f0000) == 0x000f0000) {
228 /* Revised CPUID format. Read the Memory Model Feature
229 * Register 0 and check for VMSAv7 or PMSAv7 */
230 asm("mrc p15, 0, %0, c0, c1, 4"
232 if ((mmfr0 & 0x0000000f) >= 0x00000003 ||
233 (mmfr0 & 0x000000f0) >= 0x00000030)
234 cpu_arch = CPU_ARCH_ARMv7;
235 else if ((mmfr0 & 0x0000000f) == 0x00000002 ||
236 (mmfr0 & 0x000000f0) == 0x00000020)
237 cpu_arch = CPU_ARCH_ARMv6;
239 cpu_arch = CPU_ARCH_UNKNOWN;
241 cpu_arch = CPU_ARCH_UNKNOWN;
246 static int cpu_has_aliasing_icache(unsigned int arch)
249 unsigned int id_reg, num_sets, line_size;
251 /* arch specifies the register format */
254 asm("mcr p15, 2, %0, c0, c0, 0 @ set CSSELR"
255 : /* No output operands */
258 asm("mrc p15, 1, %0, c0, c0, 0 @ read CCSIDR"
260 line_size = 4 << ((id_reg & 0x7) + 2);
261 num_sets = ((id_reg >> 13) & 0x7fff) + 1;
262 aliasing_icache = (line_size * num_sets) > PAGE_SIZE;
265 aliasing_icache = read_cpuid_cachetype() & (1 << 11);
268 /* I-cache aliases will be handled by D-cache aliasing code */
272 return aliasing_icache;
275 static void __init cacheid_init(void)
277 unsigned int cachetype = read_cpuid_cachetype();
278 unsigned int arch = cpu_architecture();
280 if (arch >= CPU_ARCH_ARMv6) {
281 if ((cachetype & (7 << 29)) == 4 << 29) {
282 /* ARMv7 register format */
283 cacheid = CACHEID_VIPT_NONALIASING;
284 if ((cachetype & (3 << 14)) == 1 << 14)
285 cacheid |= CACHEID_ASID_TAGGED;
286 else if (cpu_has_aliasing_icache(CPU_ARCH_ARMv7))
287 cacheid |= CACHEID_VIPT_I_ALIASING;
288 } else if (cachetype & (1 << 23)) {
289 cacheid = CACHEID_VIPT_ALIASING;
291 cacheid = CACHEID_VIPT_NONALIASING;
292 if (cpu_has_aliasing_icache(CPU_ARCH_ARMv6))
293 cacheid |= CACHEID_VIPT_I_ALIASING;
296 cacheid = CACHEID_VIVT;
299 printk("CPU: %s data cache, %s instruction cache\n",
300 cache_is_vivt() ? "VIVT" :
301 cache_is_vipt_aliasing() ? "VIPT aliasing" :
302 cache_is_vipt_nonaliasing() ? "VIPT nonaliasing" : "unknown",
303 cache_is_vivt() ? "VIVT" :
304 icache_is_vivt_asid_tagged() ? "VIVT ASID tagged" :
305 icache_is_vipt_aliasing() ? "VIPT aliasing" :
306 cache_is_vipt_nonaliasing() ? "VIPT nonaliasing" : "unknown");
310 * These functions re-use the assembly code in head.S, which
311 * already provide the required functionality.
313 extern struct proc_info_list *lookup_processor_type(unsigned int);
315 void __init early_print(const char *str, ...)
317 extern void printascii(const char *);
322 vsnprintf(buf, sizeof(buf), str, ap);
325 #ifdef CONFIG_DEBUG_LL
331 static void __init feat_v6_fixup(void)
333 int id = read_cpuid_id();
335 if ((id & 0xff0f0000) != 0x41070000)
339 * HWCAP_TLS is available only on 1136 r1p0 and later,
340 * see also kuser_get_tls_init.
342 if ((((id >> 4) & 0xfff) == 0xb36) && (((id >> 20) & 3) == 0))
343 elf_hwcap &= ~HWCAP_TLS;
347 * cpu_init - initialise one CPU.
349 * cpu_init sets up the per-CPU stacks.
353 unsigned int cpu = smp_processor_id();
354 struct stack *stk = &stacks[cpu];
356 if (cpu >= NR_CPUS) {
357 printk(KERN_CRIT "CPU%u: bad primary CPU number\n", cpu);
364 * Define the placement constraint for the inline asm directive below.
365 * In Thumb-2, msr with an immediate value is not allowed.
367 #ifdef CONFIG_THUMB2_KERNEL
374 * setup stacks for re-entrant exception handlers
378 "add r14, %0, %2\n\t"
381 "add r14, %0, %4\n\t"
384 "add r14, %0, %6\n\t"
389 PLC (PSR_F_BIT | PSR_I_BIT | IRQ_MODE),
390 "I" (offsetof(struct stack, irq[0])),
391 PLC (PSR_F_BIT | PSR_I_BIT | ABT_MODE),
392 "I" (offsetof(struct stack, abt[0])),
393 PLC (PSR_F_BIT | PSR_I_BIT | UND_MODE),
394 "I" (offsetof(struct stack, und[0])),
395 PLC (PSR_F_BIT | PSR_I_BIT | SVC_MODE)
399 static void __init setup_processor(void)
401 struct proc_info_list *list;
404 * locate processor in the list of supported processor
405 * types. The linker builds this table for us from the
406 * entries in arch/arm/mm/proc-*.S
408 list = lookup_processor_type(read_cpuid_id());
410 printk("CPU configuration botched (ID %08x), unable "
411 "to continue.\n", read_cpuid_id());
415 cpu_name = list->cpu_name;
418 processor = *list->proc;
421 cpu_tlb = *list->tlb;
424 cpu_user = *list->user;
427 cpu_cache = *list->cache;
430 printk("CPU: %s [%08x] revision %d (ARMv%s), cr=%08lx\n",
431 cpu_name, read_cpuid_id(), read_cpuid_id() & 15,
432 proc_arch[cpu_architecture()], cr_alignment);
434 sprintf(init_utsname()->machine, "%s%c", list->arch_name, ENDIANNESS);
435 sprintf(elf_platform, "%s%c", list->elf_name, ENDIANNESS);
436 elf_hwcap = list->elf_hwcap;
437 #ifndef CONFIG_ARM_THUMB
438 elf_hwcap &= ~HWCAP_THUMB;
447 void __init dump_machine_table(void)
449 struct machine_desc *p;
451 early_print("Available machine support:\n\nID (hex)\tNAME\n");
452 for_each_machine_desc(p)
453 early_print("%08x\t%s\n", p->nr, p->name);
455 early_print("\nPlease check your kernel config and/or bootloader.\n");
458 /* can't use cpu_relax() here as it may require MMU setup */;
461 int __init arm_add_memory(phys_addr_t start, unsigned long size)
463 struct membank *bank = &meminfo.bank[meminfo.nr_banks];
465 if (meminfo.nr_banks >= NR_BANKS) {
466 printk(KERN_CRIT "NR_BANKS too low, "
467 "ignoring memory at 0x%08llx\n", (long long)start);
472 * Ensure that start/size are aligned to a page boundary.
473 * Size is appropriately rounded down, start is rounded up.
475 size -= start & ~PAGE_MASK;
476 bank->start = PAGE_ALIGN(start);
477 bank->size = size & PAGE_MASK;
480 * Check whether this memory region has non-zero size or
481 * invalid node number.
491 * Pick out the memory size. We look for mem=size@start,
492 * where start and size are "size[KkMm]"
494 static int __init early_mem(char *p)
496 static int usermem __initdata = 0;
502 * If the user specifies memory size, we
503 * blow away any automatically generated
508 meminfo.nr_banks = 0;
512 size = memparse(p, &endp);
514 start = memparse(endp + 1, NULL);
516 arm_add_memory(start, size);
520 early_param("mem", early_mem);
523 setup_ramdisk(int doload, int prompt, int image_start, unsigned int rd_sz)
525 #ifdef CONFIG_BLK_DEV_RAM
526 extern int rd_size, rd_image_start, rd_prompt, rd_doload;
528 rd_image_start = image_start;
537 static void __init request_standard_resources(struct machine_desc *mdesc)
539 struct memblock_region *region;
540 struct resource *res;
542 kernel_code.start = virt_to_phys(_text);
543 kernel_code.end = virt_to_phys(_etext - 1);
544 kernel_data.start = virt_to_phys(_sdata);
545 kernel_data.end = virt_to_phys(_end - 1);
547 for_each_memblock(memory, region) {
548 res = alloc_bootmem_low(sizeof(*res));
549 res->name = "System RAM";
550 res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
551 res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
552 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
554 request_resource(&iomem_resource, res);
556 if (kernel_code.start >= res->start &&
557 kernel_code.end <= res->end)
558 request_resource(res, &kernel_code);
559 if (kernel_data.start >= res->start &&
560 kernel_data.end <= res->end)
561 request_resource(res, &kernel_data);
564 if (mdesc->video_start) {
565 video_ram.start = mdesc->video_start;
566 video_ram.end = mdesc->video_end;
567 request_resource(&iomem_resource, &video_ram);
571 * Some machines don't have the possibility of ever
572 * possessing lp0, lp1 or lp2
574 if (mdesc->reserve_lp0)
575 request_resource(&ioport_resource, &lp0);
576 if (mdesc->reserve_lp1)
577 request_resource(&ioport_resource, &lp1);
578 if (mdesc->reserve_lp2)
579 request_resource(&ioport_resource, &lp2);
585 * This is the new way of passing data to the kernel at boot time. Rather
586 * than passing a fixed inflexible structure to the kernel, we pass a list
587 * of variable-sized tags to the kernel. The first tag must be a ATAG_CORE
588 * tag for the list to be recognised (to distinguish the tagged list from
589 * a param_struct). The list is terminated with a zero-length tag (this tag
590 * is not parsed in any way).
592 static int __init parse_tag_core(const struct tag *tag)
594 if (tag->hdr.size > 2) {
595 if ((tag->u.core.flags & 1) == 0)
596 root_mountflags &= ~MS_RDONLY;
597 ROOT_DEV = old_decode_dev(tag->u.core.rootdev);
602 __tagtable(ATAG_CORE, parse_tag_core);
604 static int __init parse_tag_mem32(const struct tag *tag)
606 return arm_add_memory(tag->u.mem.start, tag->u.mem.size);
609 __tagtable(ATAG_MEM, parse_tag_mem32);
611 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
612 struct screen_info screen_info = {
613 .orig_video_lines = 30,
614 .orig_video_cols = 80,
615 .orig_video_mode = 0,
616 .orig_video_ega_bx = 0,
617 .orig_video_isVGA = 1,
618 .orig_video_points = 8
621 static int __init parse_tag_videotext(const struct tag *tag)
623 screen_info.orig_x = tag->u.videotext.x;
624 screen_info.orig_y = tag->u.videotext.y;
625 screen_info.orig_video_page = tag->u.videotext.video_page;
626 screen_info.orig_video_mode = tag->u.videotext.video_mode;
627 screen_info.orig_video_cols = tag->u.videotext.video_cols;
628 screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx;
629 screen_info.orig_video_lines = tag->u.videotext.video_lines;
630 screen_info.orig_video_isVGA = tag->u.videotext.video_isvga;
631 screen_info.orig_video_points = tag->u.videotext.video_points;
635 __tagtable(ATAG_VIDEOTEXT, parse_tag_videotext);
638 static int __init parse_tag_ramdisk(const struct tag *tag)
640 setup_ramdisk((tag->u.ramdisk.flags & 1) == 0,
641 (tag->u.ramdisk.flags & 2) == 0,
642 tag->u.ramdisk.start, tag->u.ramdisk.size);
646 __tagtable(ATAG_RAMDISK, parse_tag_ramdisk);
648 static int __init parse_tag_serialnr(const struct tag *tag)
650 system_serial_low = tag->u.serialnr.low;
651 system_serial_high = tag->u.serialnr.high;
655 __tagtable(ATAG_SERIAL, parse_tag_serialnr);
657 static int __init parse_tag_revision(const struct tag *tag)
659 system_rev = tag->u.revision.rev;
663 __tagtable(ATAG_REVISION, parse_tag_revision);
665 static int __init parse_tag_cmdline(const struct tag *tag)
667 #if defined(CONFIG_CMDLINE_EXTEND)
668 strlcat(default_command_line, " ", COMMAND_LINE_SIZE);
669 strlcat(default_command_line, tag->u.cmdline.cmdline,
671 #elif defined(CONFIG_CMDLINE_FORCE)
672 pr_warning("Ignoring tag cmdline (using the default kernel command line)\n");
674 strlcpy(default_command_line, tag->u.cmdline.cmdline,
680 __tagtable(ATAG_CMDLINE, parse_tag_cmdline);
683 * Scan the tag table for this tag, and call its parse function.
684 * The tag table is built by the linker from all the __tagtable
687 static int __init parse_tag(const struct tag *tag)
689 extern struct tagtable __tagtable_begin, __tagtable_end;
692 for (t = &__tagtable_begin; t < &__tagtable_end; t++)
693 if (tag->hdr.tag == t->tag) {
698 return t < &__tagtable_end;
702 * Parse all tags in the list, checking both the global and architecture
703 * specific tag tables.
705 static void __init parse_tags(const struct tag *t)
707 for (; t->hdr.size; t = tag_next(t))
710 "Ignoring unrecognised tag 0x%08x\n",
715 * This holds our defaults.
717 static struct init_tags {
718 struct tag_header hdr1;
719 struct tag_core core;
720 struct tag_header hdr2;
721 struct tag_mem32 mem;
722 struct tag_header hdr3;
723 } init_tags __initdata = {
724 { tag_size(tag_core), ATAG_CORE },
725 { 1, PAGE_SIZE, 0xff },
726 { tag_size(tag_mem32), ATAG_MEM },
731 static int __init customize_machine(void)
733 /* customizes platform devices, or adds new ones */
734 if (machine_desc->init_machine)
735 machine_desc->init_machine();
738 arch_initcall(customize_machine);
741 static inline unsigned long long get_total_mem(void)
745 total = max_low_pfn - min_low_pfn;
746 return total << PAGE_SHIFT;
750 * reserve_crashkernel() - reserves memory are for crash kernel
752 * This function reserves memory area given in "crashkernel=" kernel command
753 * line parameter. The memory reserved is used by a dump capture kernel when
754 * primary kernel is crashing.
756 static void __init reserve_crashkernel(void)
758 unsigned long long crash_size, crash_base;
759 unsigned long long total_mem;
762 total_mem = get_total_mem();
763 ret = parse_crashkernel(boot_command_line, total_mem,
764 &crash_size, &crash_base);
768 ret = reserve_bootmem(crash_base, crash_size, BOOTMEM_EXCLUSIVE);
770 printk(KERN_WARNING "crashkernel reservation failed - "
771 "memory is in use (0x%lx)\n", (unsigned long)crash_base);
775 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
776 "for crashkernel (System RAM: %ldMB)\n",
777 (unsigned long)(crash_size >> 20),
778 (unsigned long)(crash_base >> 20),
779 (unsigned long)(total_mem >> 20));
781 crashk_res.start = crash_base;
782 crashk_res.end = crash_base + crash_size - 1;
783 insert_resource(&iomem_resource, &crashk_res);
786 static inline void reserve_crashkernel(void) {}
787 #endif /* CONFIG_KEXEC */
789 static void __init squash_mem_tags(struct tag *tag)
791 for (; tag->hdr.size; tag = tag_next(tag))
792 if (tag->hdr.tag == ATAG_MEM)
793 tag->hdr.tag = ATAG_NONE;
796 static struct machine_desc * __init setup_machine_tags(unsigned int nr)
798 struct tag *tags = (struct tag *)&init_tags;
799 struct machine_desc *mdesc = NULL, *p;
800 char *from = default_command_line;
802 init_tags.mem.start = PHYS_OFFSET;
805 * locate machine in the list of supported machines.
807 for_each_machine_desc(p)
809 printk("Machine: %s\n", p->name);
815 early_print("\nError: unrecognized/unsupported machine ID"
816 " (r1 = 0x%08x).\n\n", nr);
817 dump_machine_table(); /* does not return */
821 tags = phys_to_virt(__atags_pointer);
822 else if (mdesc->boot_params) {
825 * We still are executing with a minimal MMU mapping created
826 * with the presumption that the machine default for this
827 * is located in the first MB of RAM. Anything else will
828 * fault and silently hang the kernel at this point.
830 if (mdesc->boot_params < PHYS_OFFSET ||
831 mdesc->boot_params >= PHYS_OFFSET + SZ_1M) {
833 "Default boot params at physical 0x%08lx out of reach\n",
838 tags = phys_to_virt(mdesc->boot_params);
842 #if defined(CONFIG_DEPRECATED_PARAM_STRUCT)
844 * If we have the old style parameters, convert them to
847 if (tags->hdr.tag != ATAG_CORE)
848 convert_to_tag_list(tags);
851 if (tags->hdr.tag != ATAG_CORE) {
852 #if defined(CONFIG_OF)
854 * If CONFIG_OF is set, then assume this is a reasonably
855 * modern system that should pass boot parameters
857 early_print("Warning: Neither atags nor dtb found\n");
859 tags = (struct tag *)&init_tags;
863 mdesc->fixup(mdesc, tags, &from, &meminfo);
865 if (tags->hdr.tag == ATAG_CORE) {
866 if (meminfo.nr_banks != 0)
867 squash_mem_tags(tags);
872 /* parse_early_param needs a boot_command_line */
873 strlcpy(boot_command_line, from, COMMAND_LINE_SIZE);
879 void __init setup_arch(char **cmdline_p)
881 struct machine_desc *mdesc;
886 mdesc = setup_machine_fdt(__atags_pointer);
888 mdesc = setup_machine_tags(machine_arch_type);
889 machine_desc = mdesc;
890 machine_name = mdesc->name;
892 if (mdesc->soft_reboot)
895 init_mm.start_code = (unsigned long) _text;
896 init_mm.end_code = (unsigned long) _etext;
897 init_mm.end_data = (unsigned long) _edata;
898 init_mm.brk = (unsigned long) _end;
900 /* populate cmd_line too for later use, preserving boot_command_line */
901 strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);
902 *cmdline_p = cmd_line;
906 sanity_check_meminfo();
907 arm_memblock_init(&meminfo, mdesc);
910 request_standard_resources(mdesc);
912 unflatten_device_tree();
918 reserve_crashkernel();
922 #ifdef CONFIG_ZONE_DMA
923 if (mdesc->dma_zone_size) {
924 extern unsigned long arm_dma_zone_size;
925 arm_dma_zone_size = mdesc->dma_zone_size;
928 #ifdef CONFIG_MULTI_IRQ_HANDLER
929 handle_arch_irq = mdesc->handle_irq;
933 #if defined(CONFIG_VGA_CONSOLE)
934 conswitchp = &vga_con;
935 #elif defined(CONFIG_DUMMY_CONSOLE)
936 conswitchp = &dummy_con;
941 if (mdesc->init_early)
946 static int __init topology_init(void)
950 for_each_possible_cpu(cpu) {
951 struct cpuinfo_arm *cpuinfo = &per_cpu(cpu_data, cpu);
952 cpuinfo->cpu.hotpluggable = 1;
953 register_cpu(&cpuinfo->cpu, cpu);
958 subsys_initcall(topology_init);
960 #ifdef CONFIG_HAVE_PROC_CPU
961 static int __init proc_cpu_init(void)
963 struct proc_dir_entry *res;
965 res = proc_mkdir("cpu", NULL);
970 fs_initcall(proc_cpu_init);
973 static const char *hwcap_str[] = {
996 static int c_show(struct seq_file *m, void *v)
1000 seq_printf(m, "Processor\t: %s rev %d (%s)\n",
1001 cpu_name, read_cpuid_id() & 15, elf_platform);
1003 #if defined(CONFIG_SMP)
1004 for_each_online_cpu(i) {
1006 * glibc reads /proc/cpuinfo to determine the number of
1007 * online processors, looking for lines beginning with
1008 * "processor". Give glibc what it expects.
1010 seq_printf(m, "processor\t: %d\n", i);
1011 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n",
1012 per_cpu(cpu_data, i).loops_per_jiffy / (500000UL/HZ),
1013 (per_cpu(cpu_data, i).loops_per_jiffy / (5000UL/HZ)) % 100);
1015 #else /* CONFIG_SMP */
1016 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
1017 loops_per_jiffy / (500000/HZ),
1018 (loops_per_jiffy / (5000/HZ)) % 100);
1021 /* dump out the processor features */
1022 seq_puts(m, "Features\t: ");
1024 for (i = 0; hwcap_str[i]; i++)
1025 if (elf_hwcap & (1 << i))
1026 seq_printf(m, "%s ", hwcap_str[i]);
1028 seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24);
1029 seq_printf(m, "CPU architecture: %s\n", proc_arch[cpu_architecture()]);
1031 if ((read_cpuid_id() & 0x0008f000) == 0x00000000) {
1033 seq_printf(m, "CPU part\t: %07x\n", read_cpuid_id() >> 4);
1035 if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
1037 seq_printf(m, "CPU variant\t: 0x%02x\n",
1038 (read_cpuid_id() >> 16) & 127);
1041 seq_printf(m, "CPU variant\t: 0x%x\n",
1042 (read_cpuid_id() >> 20) & 15);
1044 seq_printf(m, "CPU part\t: 0x%03x\n",
1045 (read_cpuid_id() >> 4) & 0xfff);
1047 seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15);
1051 seq_printf(m, "Hardware\t: %s\n", machine_name);
1052 seq_printf(m, "Revision\t: %04x\n", system_rev);
1053 seq_printf(m, "Serial\t\t: %08x%08x\n",
1054 system_serial_high, system_serial_low);
1059 static void *c_start(struct seq_file *m, loff_t *pos)
1061 return *pos < 1 ? (void *)1 : NULL;
1064 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
1070 static void c_stop(struct seq_file *m, void *v)
1074 const struct seq_operations cpuinfo_op = {