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/crash_dump.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>
32 #include <asm/unified.h>
34 #include <asm/cputype.h>
36 #include <asm/procinfo.h>
37 #include <asm/sections.h>
38 #include <asm/setup.h>
39 #include <asm/mach-types.h>
40 #include <asm/cacheflush.h>
41 #include <asm/cachetype.h>
42 #include <asm/tlbflush.h>
44 #include <asm/mach/arch.h>
45 #include <asm/mach/irq.h>
46 #include <asm/mach/time.h>
47 #include <asm/traps.h>
48 #include <asm/unwind.h>
50 #if defined(CONFIG_DEPRECATED_PARAM_STRUCT)
57 #define MEM_SIZE (16*1024*1024)
60 #if defined(CONFIG_FPE_NWFPE) || defined(CONFIG_FPE_FASTFPE)
63 static int __init fpe_setup(char *line)
65 memcpy(fpe_type, line, 8);
69 __setup("fpe=", fpe_setup);
72 extern void paging_init(struct machine_desc *desc);
73 extern void reboot_setup(char *str);
75 unsigned int processor_id;
76 EXPORT_SYMBOL(processor_id);
77 unsigned int __machine_arch_type;
78 EXPORT_SYMBOL(__machine_arch_type);
80 EXPORT_SYMBOL(cacheid);
82 unsigned int __atags_pointer __initdata;
84 unsigned int system_rev;
85 EXPORT_SYMBOL(system_rev);
87 unsigned int system_serial_low;
88 EXPORT_SYMBOL(system_serial_low);
90 unsigned int system_serial_high;
91 EXPORT_SYMBOL(system_serial_high);
93 unsigned int elf_hwcap;
94 EXPORT_SYMBOL(elf_hwcap);
98 struct processor processor;
101 struct cpu_tlb_fns cpu_tlb;
104 struct cpu_user_fns cpu_user;
107 struct cpu_cache_fns cpu_cache;
109 #ifdef CONFIG_OUTER_CACHE
110 struct outer_cache_fns outer_cache;
111 EXPORT_SYMBOL(outer_cache);
118 } ____cacheline_aligned;
120 static struct stack stacks[NR_CPUS];
122 char elf_platform[ELF_PLATFORM_SIZE];
123 EXPORT_SYMBOL(elf_platform);
125 static const char *cpu_name;
126 static const char *machine_name;
127 static char __initdata cmd_line[COMMAND_LINE_SIZE];
129 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
130 static union { char c[4]; unsigned long l; } endian_test __initdata = { { 'l', '?', '?', 'b' } };
131 #define ENDIANNESS ((char)endian_test.l)
133 DEFINE_PER_CPU(struct cpuinfo_arm, cpu_data);
136 * Standard memory resources
138 static struct resource mem_res[] = {
143 .flags = IORESOURCE_MEM
146 .name = "Kernel text",
149 .flags = IORESOURCE_MEM
152 .name = "Kernel data",
155 .flags = IORESOURCE_MEM
159 #define video_ram mem_res[0]
160 #define kernel_code mem_res[1]
161 #define kernel_data mem_res[2]
163 static struct resource io_res[] = {
168 .flags = IORESOURCE_IO | IORESOURCE_BUSY
174 .flags = IORESOURCE_IO | IORESOURCE_BUSY
180 .flags = IORESOURCE_IO | IORESOURCE_BUSY
184 #define lp0 io_res[0]
185 #define lp1 io_res[1]
186 #define lp2 io_res[2]
188 static const char *proc_arch[] = {
208 int cpu_architecture(void)
212 if ((read_cpuid_id() & 0x0008f000) == 0) {
213 cpu_arch = CPU_ARCH_UNKNOWN;
214 } else if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
215 cpu_arch = (read_cpuid_id() & (1 << 23)) ? CPU_ARCH_ARMv4T : CPU_ARCH_ARMv3;
216 } else if ((read_cpuid_id() & 0x00080000) == 0x00000000) {
217 cpu_arch = (read_cpuid_id() >> 16) & 7;
219 cpu_arch += CPU_ARCH_ARMv3;
220 } else if ((read_cpuid_id() & 0x000f0000) == 0x000f0000) {
223 /* Revised CPUID format. Read the Memory Model Feature
224 * Register 0 and check for VMSAv7 or PMSAv7 */
225 asm("mrc p15, 0, %0, c0, c1, 4"
227 if ((mmfr0 & 0x0000000f) == 0x00000003 ||
228 (mmfr0 & 0x000000f0) == 0x00000030)
229 cpu_arch = CPU_ARCH_ARMv7;
230 else if ((mmfr0 & 0x0000000f) == 0x00000002 ||
231 (mmfr0 & 0x000000f0) == 0x00000020)
232 cpu_arch = CPU_ARCH_ARMv6;
234 cpu_arch = CPU_ARCH_UNKNOWN;
236 cpu_arch = CPU_ARCH_UNKNOWN;
241 static void __init cacheid_init(void)
243 unsigned int cachetype = read_cpuid_cachetype();
244 unsigned int arch = cpu_architecture();
246 if (arch >= CPU_ARCH_ARMv6) {
247 if ((cachetype & (7 << 29)) == 4 << 29) {
248 /* ARMv7 register format */
249 cacheid = CACHEID_VIPT_NONALIASING;
250 if ((cachetype & (3 << 14)) == 1 << 14)
251 cacheid |= CACHEID_ASID_TAGGED;
252 } else if (cachetype & (1 << 23))
253 cacheid = CACHEID_VIPT_ALIASING;
255 cacheid = CACHEID_VIPT_NONALIASING;
257 cacheid = CACHEID_VIVT;
260 printk("CPU: %s data cache, %s instruction cache\n",
261 cache_is_vivt() ? "VIVT" :
262 cache_is_vipt_aliasing() ? "VIPT aliasing" :
263 cache_is_vipt_nonaliasing() ? "VIPT nonaliasing" : "unknown",
264 cache_is_vivt() ? "VIVT" :
265 icache_is_vivt_asid_tagged() ? "VIVT ASID tagged" :
266 cache_is_vipt_aliasing() ? "VIPT aliasing" :
267 cache_is_vipt_nonaliasing() ? "VIPT nonaliasing" : "unknown");
271 * These functions re-use the assembly code in head.S, which
272 * already provide the required functionality.
274 extern struct proc_info_list *lookup_processor_type(unsigned int);
275 extern struct machine_desc *lookup_machine_type(unsigned int);
277 static void __init feat_v6_fixup(void)
279 int id = read_cpuid_id();
281 if ((id & 0xff0f0000) != 0x41070000)
285 * HWCAP_TLS is available only on 1136 r1p0 and later,
286 * see also kuser_get_tls_init.
288 if ((((id >> 4) & 0xfff) == 0xb36) && (((id >> 20) & 3) == 0))
289 elf_hwcap &= ~HWCAP_TLS;
292 static void __init setup_processor(void)
294 struct proc_info_list *list;
297 * locate processor in the list of supported processor
298 * types. The linker builds this table for us from the
299 * entries in arch/arm/mm/proc-*.S
301 list = lookup_processor_type(read_cpuid_id());
303 printk("CPU configuration botched (ID %08x), unable "
304 "to continue.\n", read_cpuid_id());
308 cpu_name = list->cpu_name;
311 processor = *list->proc;
314 cpu_tlb = *list->tlb;
317 cpu_user = *list->user;
320 cpu_cache = *list->cache;
323 printk("CPU: %s [%08x] revision %d (ARMv%s), cr=%08lx\n",
324 cpu_name, read_cpuid_id(), read_cpuid_id() & 15,
325 proc_arch[cpu_architecture()], cr_alignment);
327 sprintf(init_utsname()->machine, "%s%c", list->arch_name, ENDIANNESS);
328 sprintf(elf_platform, "%s%c", list->elf_name, ENDIANNESS);
329 elf_hwcap = list->elf_hwcap;
330 #ifndef CONFIG_ARM_THUMB
331 elf_hwcap &= ~HWCAP_THUMB;
341 * cpu_init - initialise one CPU.
343 * cpu_init sets up the per-CPU stacks.
347 unsigned int cpu = smp_processor_id();
348 struct stack *stk = &stacks[cpu];
350 if (cpu >= NR_CPUS) {
351 printk(KERN_CRIT "CPU%u: bad primary CPU number\n", cpu);
356 * Define the placement constraint for the inline asm directive below.
357 * In Thumb-2, msr with an immediate value is not allowed.
359 #ifdef CONFIG_THUMB2_KERNEL
366 * setup stacks for re-entrant exception handlers
370 "add r14, %0, %2\n\t"
373 "add r14, %0, %4\n\t"
376 "add r14, %0, %6\n\t"
381 PLC (PSR_F_BIT | PSR_I_BIT | IRQ_MODE),
382 "I" (offsetof(struct stack, irq[0])),
383 PLC (PSR_F_BIT | PSR_I_BIT | ABT_MODE),
384 "I" (offsetof(struct stack, abt[0])),
385 PLC (PSR_F_BIT | PSR_I_BIT | UND_MODE),
386 "I" (offsetof(struct stack, und[0])),
387 PLC (PSR_F_BIT | PSR_I_BIT | SVC_MODE)
391 static struct machine_desc * __init setup_machine(unsigned int nr)
393 struct machine_desc *list;
396 * locate machine in the list of supported machines.
398 list = lookup_machine_type(nr);
400 printk("Machine configuration botched (nr %d), unable "
401 "to continue.\n", nr);
405 printk("Machine: %s\n", list->name);
410 static int __init arm_add_memory(unsigned long start, unsigned long size)
412 struct membank *bank = &meminfo.bank[meminfo.nr_banks];
414 if (meminfo.nr_banks >= NR_BANKS) {
415 printk(KERN_CRIT "NR_BANKS too low, "
416 "ignoring memory at %#lx\n", start);
421 * Ensure that start/size are aligned to a page boundary.
422 * Size is appropriately rounded down, start is rounded up.
424 size -= start & ~PAGE_MASK;
425 bank->start = PAGE_ALIGN(start);
426 bank->size = size & PAGE_MASK;
429 * Check whether this memory region has non-zero size or
430 * invalid node number.
440 * Pick out the memory size. We look for mem=size@start,
441 * where start and size are "size[KkMm]"
443 static int __init early_mem(char *p)
445 static int usermem __initdata = 0;
446 unsigned long size, start;
450 * If the user specifies memory size, we
451 * blow away any automatically generated
456 meminfo.nr_banks = 0;
460 size = memparse(p, &endp);
462 start = memparse(endp + 1, NULL);
464 arm_add_memory(start, size);
468 early_param("mem", early_mem);
471 setup_ramdisk(int doload, int prompt, int image_start, unsigned int rd_sz)
473 #ifdef CONFIG_BLK_DEV_RAM
474 extern int rd_size, rd_image_start, rd_prompt, rd_doload;
476 rd_image_start = image_start;
486 request_standard_resources(struct meminfo *mi, struct machine_desc *mdesc)
488 struct resource *res;
491 kernel_code.start = virt_to_phys(_text);
492 kernel_code.end = virt_to_phys(_etext - 1);
493 kernel_data.start = virt_to_phys(_data);
494 kernel_data.end = virt_to_phys(_end - 1);
496 for (i = 0; i < mi->nr_banks; i++) {
497 if (mi->bank[i].size == 0)
500 res = alloc_bootmem_low(sizeof(*res));
501 res->name = "System RAM";
502 res->start = mi->bank[i].start;
503 res->end = mi->bank[i].start + mi->bank[i].size - 1;
504 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
506 request_resource(&iomem_resource, res);
508 if (kernel_code.start >= res->start &&
509 kernel_code.end <= res->end)
510 request_resource(res, &kernel_code);
511 if (kernel_data.start >= res->start &&
512 kernel_data.end <= res->end)
513 request_resource(res, &kernel_data);
516 if (mdesc->video_start) {
517 video_ram.start = mdesc->video_start;
518 video_ram.end = mdesc->video_end;
519 request_resource(&iomem_resource, &video_ram);
523 * Some machines don't have the possibility of ever
524 * possessing lp0, lp1 or lp2
526 if (mdesc->reserve_lp0)
527 request_resource(&ioport_resource, &lp0);
528 if (mdesc->reserve_lp1)
529 request_resource(&ioport_resource, &lp1);
530 if (mdesc->reserve_lp2)
531 request_resource(&ioport_resource, &lp2);
537 * This is the new way of passing data to the kernel at boot time. Rather
538 * than passing a fixed inflexible structure to the kernel, we pass a list
539 * of variable-sized tags to the kernel. The first tag must be a ATAG_CORE
540 * tag for the list to be recognised (to distinguish the tagged list from
541 * a param_struct). The list is terminated with a zero-length tag (this tag
542 * is not parsed in any way).
544 static int __init parse_tag_core(const struct tag *tag)
546 if (tag->hdr.size > 2) {
547 if ((tag->u.core.flags & 1) == 0)
548 root_mountflags &= ~MS_RDONLY;
549 ROOT_DEV = old_decode_dev(tag->u.core.rootdev);
554 __tagtable(ATAG_CORE, parse_tag_core);
556 static int __init parse_tag_mem32(const struct tag *tag)
558 return arm_add_memory(tag->u.mem.start, tag->u.mem.size);
561 __tagtable(ATAG_MEM, parse_tag_mem32);
563 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
564 struct screen_info screen_info = {
565 .orig_video_lines = 30,
566 .orig_video_cols = 80,
567 .orig_video_mode = 0,
568 .orig_video_ega_bx = 0,
569 .orig_video_isVGA = 1,
570 .orig_video_points = 8
573 static int __init parse_tag_videotext(const struct tag *tag)
575 screen_info.orig_x = tag->u.videotext.x;
576 screen_info.orig_y = tag->u.videotext.y;
577 screen_info.orig_video_page = tag->u.videotext.video_page;
578 screen_info.orig_video_mode = tag->u.videotext.video_mode;
579 screen_info.orig_video_cols = tag->u.videotext.video_cols;
580 screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx;
581 screen_info.orig_video_lines = tag->u.videotext.video_lines;
582 screen_info.orig_video_isVGA = tag->u.videotext.video_isvga;
583 screen_info.orig_video_points = tag->u.videotext.video_points;
587 __tagtable(ATAG_VIDEOTEXT, parse_tag_videotext);
590 static int __init parse_tag_ramdisk(const struct tag *tag)
592 setup_ramdisk((tag->u.ramdisk.flags & 1) == 0,
593 (tag->u.ramdisk.flags & 2) == 0,
594 tag->u.ramdisk.start, tag->u.ramdisk.size);
598 __tagtable(ATAG_RAMDISK, parse_tag_ramdisk);
600 static int __init parse_tag_serialnr(const struct tag *tag)
602 system_serial_low = tag->u.serialnr.low;
603 system_serial_high = tag->u.serialnr.high;
607 __tagtable(ATAG_SERIAL, parse_tag_serialnr);
609 static int __init parse_tag_revision(const struct tag *tag)
611 system_rev = tag->u.revision.rev;
615 __tagtable(ATAG_REVISION, parse_tag_revision);
617 #ifndef CONFIG_CMDLINE_FORCE
618 static int __init parse_tag_cmdline(const struct tag *tag)
620 strlcpy(default_command_line, tag->u.cmdline.cmdline, COMMAND_LINE_SIZE);
624 __tagtable(ATAG_CMDLINE, parse_tag_cmdline);
625 #endif /* CONFIG_CMDLINE_FORCE */
628 * Scan the tag table for this tag, and call its parse function.
629 * The tag table is built by the linker from all the __tagtable
632 static int __init parse_tag(const struct tag *tag)
634 extern struct tagtable __tagtable_begin, __tagtable_end;
637 for (t = &__tagtable_begin; t < &__tagtable_end; t++)
638 if (tag->hdr.tag == t->tag) {
643 return t < &__tagtable_end;
647 * Parse all tags in the list, checking both the global and architecture
648 * specific tag tables.
650 static void __init parse_tags(const struct tag *t)
652 for (; t->hdr.size; t = tag_next(t))
655 "Ignoring unrecognised tag 0x%08x\n",
660 * This holds our defaults.
662 static struct init_tags {
663 struct tag_header hdr1;
664 struct tag_core core;
665 struct tag_header hdr2;
666 struct tag_mem32 mem;
667 struct tag_header hdr3;
668 } init_tags __initdata = {
669 { tag_size(tag_core), ATAG_CORE },
670 { 1, PAGE_SIZE, 0xff },
671 { tag_size(tag_mem32), ATAG_MEM },
672 { MEM_SIZE, PHYS_OFFSET },
676 static void (*init_machine)(void) __initdata;
678 static int __init customize_machine(void)
680 /* customizes platform devices, or adds new ones */
685 arch_initcall(customize_machine);
688 static inline unsigned long long get_total_mem(void)
692 total = max_low_pfn - min_low_pfn;
693 return total << PAGE_SHIFT;
697 * reserve_crashkernel() - reserves memory are for crash kernel
699 * This function reserves memory area given in "crashkernel=" kernel command
700 * line parameter. The memory reserved is used by a dump capture kernel when
701 * primary kernel is crashing.
703 static void __init reserve_crashkernel(void)
705 unsigned long long crash_size, crash_base;
706 unsigned long long total_mem;
709 total_mem = get_total_mem();
710 ret = parse_crashkernel(boot_command_line, total_mem,
711 &crash_size, &crash_base);
715 ret = reserve_bootmem(crash_base, crash_size, BOOTMEM_EXCLUSIVE);
717 printk(KERN_WARNING "crashkernel reservation failed - "
718 "memory is in use (0x%lx)\n", (unsigned long)crash_base);
722 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
723 "for crashkernel (System RAM: %ldMB)\n",
724 (unsigned long)(crash_size >> 20),
725 (unsigned long)(crash_base >> 20),
726 (unsigned long)(total_mem >> 20));
728 crashk_res.start = crash_base;
729 crashk_res.end = crash_base + crash_size - 1;
730 insert_resource(&iomem_resource, &crashk_res);
733 static inline void reserve_crashkernel(void) {}
734 #endif /* CONFIG_KEXEC */
737 * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
738 * is_kdump_kernel() to determine if we are booting after a panic. Hence
739 * ifdef it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
742 #ifdef CONFIG_CRASH_DUMP
744 * elfcorehdr= specifies the location of elf core header stored by the crashed
745 * kernel. This option will be passed by kexec loader to the capture kernel.
747 static int __init setup_elfcorehdr(char *arg)
754 elfcorehdr_addr = memparse(arg, &end);
755 return end > arg ? 0 : -EINVAL;
757 early_param("elfcorehdr", setup_elfcorehdr);
758 #endif /* CONFIG_CRASH_DUMP */
760 static void __init squash_mem_tags(struct tag *tag)
762 for (; tag->hdr.size; tag = tag_next(tag))
763 if (tag->hdr.tag == ATAG_MEM)
764 tag->hdr.tag = ATAG_NONE;
767 void __init setup_arch(char **cmdline_p)
769 struct tag *tags = (struct tag *)&init_tags;
770 struct machine_desc *mdesc;
771 char *from = default_command_line;
776 mdesc = setup_machine(machine_arch_type);
777 machine_name = mdesc->name;
779 if (mdesc->soft_reboot)
783 tags = phys_to_virt(__atags_pointer);
784 else if (mdesc->boot_params)
785 tags = phys_to_virt(mdesc->boot_params);
787 #if defined(CONFIG_DEPRECATED_PARAM_STRUCT)
789 * If we have the old style parameters, convert them to
792 if (tags->hdr.tag != ATAG_CORE)
793 convert_to_tag_list(tags);
795 if (tags->hdr.tag != ATAG_CORE)
796 tags = (struct tag *)&init_tags;
799 mdesc->fixup(mdesc, tags, &from, &meminfo);
801 if (tags->hdr.tag == ATAG_CORE) {
802 if (meminfo.nr_banks != 0)
803 squash_mem_tags(tags);
808 init_mm.start_code = (unsigned long) _text;
809 init_mm.end_code = (unsigned long) _etext;
810 init_mm.end_data = (unsigned long) _edata;
811 init_mm.brk = (unsigned long) _end;
813 /* parse_early_param needs a boot_command_line */
814 strlcpy(boot_command_line, from, COMMAND_LINE_SIZE);
816 /* populate cmd_line too for later use, preserving boot_command_line */
817 strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);
818 *cmdline_p = cmd_line;
822 arm_memblock_init(&meminfo, mdesc);
825 request_standard_resources(&meminfo, mdesc);
830 reserve_crashkernel();
836 * Set up various architecture-specific pointers
838 arch_nr_irqs = mdesc->nr_irqs;
839 init_arch_irq = mdesc->init_irq;
840 system_timer = mdesc->timer;
841 init_machine = mdesc->init_machine;
844 #if defined(CONFIG_VGA_CONSOLE)
845 conswitchp = &vga_con;
846 #elif defined(CONFIG_DUMMY_CONSOLE)
847 conswitchp = &dummy_con;
854 static int __init topology_init(void)
858 for_each_possible_cpu(cpu) {
859 struct cpuinfo_arm *cpuinfo = &per_cpu(cpu_data, cpu);
860 cpuinfo->cpu.hotpluggable = 1;
861 register_cpu(&cpuinfo->cpu, cpu);
866 subsys_initcall(topology_init);
868 #ifdef CONFIG_HAVE_PROC_CPU
869 static int __init proc_cpu_init(void)
871 struct proc_dir_entry *res;
873 res = proc_mkdir("cpu", NULL);
878 fs_initcall(proc_cpu_init);
881 static const char *hwcap_str[] = {
900 static int c_show(struct seq_file *m, void *v)
904 seq_printf(m, "Processor\t: %s rev %d (%s)\n",
905 cpu_name, read_cpuid_id() & 15, elf_platform);
907 #if defined(CONFIG_SMP)
908 for_each_online_cpu(i) {
910 * glibc reads /proc/cpuinfo to determine the number of
911 * online processors, looking for lines beginning with
912 * "processor". Give glibc what it expects.
914 seq_printf(m, "processor\t: %d\n", i);
915 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n",
916 per_cpu(cpu_data, i).loops_per_jiffy / (500000UL/HZ),
917 (per_cpu(cpu_data, i).loops_per_jiffy / (5000UL/HZ)) % 100);
919 #else /* CONFIG_SMP */
920 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
921 loops_per_jiffy / (500000/HZ),
922 (loops_per_jiffy / (5000/HZ)) % 100);
925 /* dump out the processor features */
926 seq_puts(m, "Features\t: ");
928 for (i = 0; hwcap_str[i]; i++)
929 if (elf_hwcap & (1 << i))
930 seq_printf(m, "%s ", hwcap_str[i]);
932 seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24);
933 seq_printf(m, "CPU architecture: %s\n", proc_arch[cpu_architecture()]);
935 if ((read_cpuid_id() & 0x0008f000) == 0x00000000) {
937 seq_printf(m, "CPU part\t: %07x\n", read_cpuid_id() >> 4);
939 if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
941 seq_printf(m, "CPU variant\t: 0x%02x\n",
942 (read_cpuid_id() >> 16) & 127);
945 seq_printf(m, "CPU variant\t: 0x%x\n",
946 (read_cpuid_id() >> 20) & 15);
948 seq_printf(m, "CPU part\t: 0x%03x\n",
949 (read_cpuid_id() >> 4) & 0xfff);
951 seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15);
955 seq_printf(m, "Hardware\t: %s\n", machine_name);
956 seq_printf(m, "Revision\t: %04x\n", system_rev);
957 seq_printf(m, "Serial\t\t: %08x%08x\n",
958 system_serial_high, system_serial_low);
963 static void *c_start(struct seq_file *m, loff_t *pos)
965 return *pos < 1 ? (void *)1 : NULL;
968 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
974 static void c_stop(struct seq_file *m, void *v)
978 const struct seq_operations cpuinfo_op = {