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>
55 #define MEM_SIZE (16*1024*1024)
58 #if defined(CONFIG_FPE_NWFPE) || defined(CONFIG_FPE_FASTFPE)
61 static int __init fpe_setup(char *line)
63 memcpy(fpe_type, line, 8);
67 __setup("fpe=", fpe_setup);
70 extern void paging_init(struct machine_desc *desc);
71 extern void reboot_setup(char *str);
73 unsigned int processor_id;
74 EXPORT_SYMBOL(processor_id);
75 unsigned int __machine_arch_type;
76 EXPORT_SYMBOL(__machine_arch_type);
78 EXPORT_SYMBOL(cacheid);
80 unsigned int __atags_pointer __initdata;
82 unsigned int system_rev;
83 EXPORT_SYMBOL(system_rev);
85 unsigned int system_serial_low;
86 EXPORT_SYMBOL(system_serial_low);
88 unsigned int system_serial_high;
89 EXPORT_SYMBOL(system_serial_high);
91 unsigned int elf_hwcap;
92 EXPORT_SYMBOL(elf_hwcap);
96 struct processor processor;
99 struct cpu_tlb_fns cpu_tlb;
102 struct cpu_user_fns cpu_user;
105 struct cpu_cache_fns cpu_cache;
107 #ifdef CONFIG_OUTER_CACHE
108 struct outer_cache_fns outer_cache;
109 EXPORT_SYMBOL(outer_cache);
116 } ____cacheline_aligned;
118 static struct stack stacks[NR_CPUS];
120 char elf_platform[ELF_PLATFORM_SIZE];
121 EXPORT_SYMBOL(elf_platform);
123 static const char *cpu_name;
124 static const char *machine_name;
125 static char __initdata cmd_line[COMMAND_LINE_SIZE];
127 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
128 static union { char c[4]; unsigned long l; } endian_test __initdata = { { 'l', '?', '?', 'b' } };
129 #define ENDIANNESS ((char)endian_test.l)
131 DEFINE_PER_CPU(struct cpuinfo_arm, cpu_data);
134 * Standard memory resources
136 static struct resource mem_res[] = {
141 .flags = IORESOURCE_MEM
144 .name = "Kernel text",
147 .flags = IORESOURCE_MEM
150 .name = "Kernel data",
153 .flags = IORESOURCE_MEM
157 #define video_ram mem_res[0]
158 #define kernel_code mem_res[1]
159 #define kernel_data mem_res[2]
161 static struct resource io_res[] = {
166 .flags = IORESOURCE_IO | IORESOURCE_BUSY
172 .flags = IORESOURCE_IO | IORESOURCE_BUSY
178 .flags = IORESOURCE_IO | IORESOURCE_BUSY
182 #define lp0 io_res[0]
183 #define lp1 io_res[1]
184 #define lp2 io_res[2]
186 static const char *proc_arch[] = {
206 int cpu_architecture(void)
210 if ((read_cpuid_id() & 0x0008f000) == 0) {
211 cpu_arch = CPU_ARCH_UNKNOWN;
212 } else if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
213 cpu_arch = (read_cpuid_id() & (1 << 23)) ? CPU_ARCH_ARMv4T : CPU_ARCH_ARMv3;
214 } else if ((read_cpuid_id() & 0x00080000) == 0x00000000) {
215 cpu_arch = (read_cpuid_id() >> 16) & 7;
217 cpu_arch += CPU_ARCH_ARMv3;
218 } else if ((read_cpuid_id() & 0x000f0000) == 0x000f0000) {
221 /* Revised CPUID format. Read the Memory Model Feature
222 * Register 0 and check for VMSAv7 or PMSAv7 */
223 asm("mrc p15, 0, %0, c0, c1, 4"
225 if ((mmfr0 & 0x0000000f) == 0x00000003 ||
226 (mmfr0 & 0x000000f0) == 0x00000030)
227 cpu_arch = CPU_ARCH_ARMv7;
228 else if ((mmfr0 & 0x0000000f) == 0x00000002 ||
229 (mmfr0 & 0x000000f0) == 0x00000020)
230 cpu_arch = CPU_ARCH_ARMv6;
232 cpu_arch = CPU_ARCH_UNKNOWN;
234 cpu_arch = CPU_ARCH_UNKNOWN;
239 static void __init cacheid_init(void)
241 unsigned int cachetype = read_cpuid_cachetype();
242 unsigned int arch = cpu_architecture();
244 if (arch >= CPU_ARCH_ARMv6) {
245 if ((cachetype & (7 << 29)) == 4 << 29) {
246 /* ARMv7 register format */
247 cacheid = CACHEID_VIPT_NONALIASING;
248 if ((cachetype & (3 << 14)) == 1 << 14)
249 cacheid |= CACHEID_ASID_TAGGED;
250 } else if (cachetype & (1 << 23))
251 cacheid = CACHEID_VIPT_ALIASING;
253 cacheid = CACHEID_VIPT_NONALIASING;
255 cacheid = CACHEID_VIVT;
258 printk("CPU: %s data cache, %s instruction cache\n",
259 cache_is_vivt() ? "VIVT" :
260 cache_is_vipt_aliasing() ? "VIPT aliasing" :
261 cache_is_vipt_nonaliasing() ? "VIPT nonaliasing" : "unknown",
262 cache_is_vivt() ? "VIVT" :
263 icache_is_vivt_asid_tagged() ? "VIVT ASID tagged" :
264 cache_is_vipt_aliasing() ? "VIPT aliasing" :
265 cache_is_vipt_nonaliasing() ? "VIPT nonaliasing" : "unknown");
269 * These functions re-use the assembly code in head.S, which
270 * already provide the required functionality.
272 extern struct proc_info_list *lookup_processor_type(unsigned int);
273 extern struct machine_desc *lookup_machine_type(unsigned int);
275 static void __init feat_v6_fixup(void)
277 int id = read_cpuid_id();
279 if ((id & 0xff0f0000) != 0x41070000)
283 * HWCAP_TLS is available only on 1136 r1p0 and later,
284 * see also kuser_get_tls_init.
286 if ((((id >> 4) & 0xfff) == 0xb36) && (((id >> 20) & 3) == 0))
287 elf_hwcap &= ~HWCAP_TLS;
290 static void __init setup_processor(void)
292 struct proc_info_list *list;
295 * locate processor in the list of supported processor
296 * types. The linker builds this table for us from the
297 * entries in arch/arm/mm/proc-*.S
299 list = lookup_processor_type(read_cpuid_id());
301 printk("CPU configuration botched (ID %08x), unable "
302 "to continue.\n", read_cpuid_id());
306 cpu_name = list->cpu_name;
309 processor = *list->proc;
312 cpu_tlb = *list->tlb;
315 cpu_user = *list->user;
318 cpu_cache = *list->cache;
321 printk("CPU: %s [%08x] revision %d (ARMv%s), cr=%08lx\n",
322 cpu_name, read_cpuid_id(), read_cpuid_id() & 15,
323 proc_arch[cpu_architecture()], cr_alignment);
325 sprintf(init_utsname()->machine, "%s%c", list->arch_name, ENDIANNESS);
326 sprintf(elf_platform, "%s%c", list->elf_name, ENDIANNESS);
327 elf_hwcap = list->elf_hwcap;
328 #ifndef CONFIG_ARM_THUMB
329 elf_hwcap &= ~HWCAP_THUMB;
339 * cpu_init - initialise one CPU.
341 * cpu_init sets up the per-CPU stacks.
345 unsigned int cpu = smp_processor_id();
346 struct stack *stk = &stacks[cpu];
348 if (cpu >= NR_CPUS) {
349 printk(KERN_CRIT "CPU%u: bad primary CPU number\n", cpu);
354 * Define the placement constraint for the inline asm directive below.
355 * In Thumb-2, msr with an immediate value is not allowed.
357 #ifdef CONFIG_THUMB2_KERNEL
364 * setup stacks for re-entrant exception handlers
368 "add r14, %0, %2\n\t"
371 "add r14, %0, %4\n\t"
374 "add r14, %0, %6\n\t"
379 PLC (PSR_F_BIT | PSR_I_BIT | IRQ_MODE),
380 "I" (offsetof(struct stack, irq[0])),
381 PLC (PSR_F_BIT | PSR_I_BIT | ABT_MODE),
382 "I" (offsetof(struct stack, abt[0])),
383 PLC (PSR_F_BIT | PSR_I_BIT | UND_MODE),
384 "I" (offsetof(struct stack, und[0])),
385 PLC (PSR_F_BIT | PSR_I_BIT | SVC_MODE)
389 static struct machine_desc * __init setup_machine(unsigned int nr)
391 struct machine_desc *list;
394 * locate machine in the list of supported machines.
396 list = lookup_machine_type(nr);
398 printk("Machine configuration botched (nr %d), unable "
399 "to continue.\n", nr);
403 printk("Machine: %s\n", list->name);
408 static int __init arm_add_memory(unsigned long start, unsigned long size)
410 struct membank *bank = &meminfo.bank[meminfo.nr_banks];
412 if (meminfo.nr_banks >= NR_BANKS) {
413 printk(KERN_CRIT "NR_BANKS too low, "
414 "ignoring memory at %#lx\n", start);
419 * Ensure that start/size are aligned to a page boundary.
420 * Size is appropriately rounded down, start is rounded up.
422 size -= start & ~PAGE_MASK;
423 bank->start = PAGE_ALIGN(start);
424 bank->size = size & PAGE_MASK;
427 * Check whether this memory region has non-zero size or
428 * invalid node number.
438 * Pick out the memory size. We look for mem=size@start,
439 * where start and size are "size[KkMm]"
441 static int __init early_mem(char *p)
443 static int usermem __initdata = 0;
444 unsigned long size, start;
448 * If the user specifies memory size, we
449 * blow away any automatically generated
454 meminfo.nr_banks = 0;
458 size = memparse(p, &endp);
460 start = memparse(endp + 1, NULL);
462 arm_add_memory(start, size);
466 early_param("mem", early_mem);
469 setup_ramdisk(int doload, int prompt, int image_start, unsigned int rd_sz)
471 #ifdef CONFIG_BLK_DEV_RAM
472 extern int rd_size, rd_image_start, rd_prompt, rd_doload;
474 rd_image_start = image_start;
484 request_standard_resources(struct meminfo *mi, struct machine_desc *mdesc)
486 struct resource *res;
489 kernel_code.start = virt_to_phys(_text);
490 kernel_code.end = virt_to_phys(_etext - 1);
491 kernel_data.start = virt_to_phys(_data);
492 kernel_data.end = virt_to_phys(_end - 1);
494 for (i = 0; i < mi->nr_banks; i++) {
495 if (mi->bank[i].size == 0)
498 res = alloc_bootmem_low(sizeof(*res));
499 res->name = "System RAM";
500 res->start = mi->bank[i].start;
501 res->end = mi->bank[i].start + mi->bank[i].size - 1;
502 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
504 request_resource(&iomem_resource, res);
506 if (kernel_code.start >= res->start &&
507 kernel_code.end <= res->end)
508 request_resource(res, &kernel_code);
509 if (kernel_data.start >= res->start &&
510 kernel_data.end <= res->end)
511 request_resource(res, &kernel_data);
514 if (mdesc->video_start) {
515 video_ram.start = mdesc->video_start;
516 video_ram.end = mdesc->video_end;
517 request_resource(&iomem_resource, &video_ram);
521 * Some machines don't have the possibility of ever
522 * possessing lp0, lp1 or lp2
524 if (mdesc->reserve_lp0)
525 request_resource(&ioport_resource, &lp0);
526 if (mdesc->reserve_lp1)
527 request_resource(&ioport_resource, &lp1);
528 if (mdesc->reserve_lp2)
529 request_resource(&ioport_resource, &lp2);
535 * This is the new way of passing data to the kernel at boot time. Rather
536 * than passing a fixed inflexible structure to the kernel, we pass a list
537 * of variable-sized tags to the kernel. The first tag must be a ATAG_CORE
538 * tag for the list to be recognised (to distinguish the tagged list from
539 * a param_struct). The list is terminated with a zero-length tag (this tag
540 * is not parsed in any way).
542 static int __init parse_tag_core(const struct tag *tag)
544 if (tag->hdr.size > 2) {
545 if ((tag->u.core.flags & 1) == 0)
546 root_mountflags &= ~MS_RDONLY;
547 ROOT_DEV = old_decode_dev(tag->u.core.rootdev);
552 __tagtable(ATAG_CORE, parse_tag_core);
554 static int __init parse_tag_mem32(const struct tag *tag)
556 return arm_add_memory(tag->u.mem.start, tag->u.mem.size);
559 __tagtable(ATAG_MEM, parse_tag_mem32);
561 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
562 struct screen_info screen_info = {
563 .orig_video_lines = 30,
564 .orig_video_cols = 80,
565 .orig_video_mode = 0,
566 .orig_video_ega_bx = 0,
567 .orig_video_isVGA = 1,
568 .orig_video_points = 8
571 static int __init parse_tag_videotext(const struct tag *tag)
573 screen_info.orig_x = tag->u.videotext.x;
574 screen_info.orig_y = tag->u.videotext.y;
575 screen_info.orig_video_page = tag->u.videotext.video_page;
576 screen_info.orig_video_mode = tag->u.videotext.video_mode;
577 screen_info.orig_video_cols = tag->u.videotext.video_cols;
578 screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx;
579 screen_info.orig_video_lines = tag->u.videotext.video_lines;
580 screen_info.orig_video_isVGA = tag->u.videotext.video_isvga;
581 screen_info.orig_video_points = tag->u.videotext.video_points;
585 __tagtable(ATAG_VIDEOTEXT, parse_tag_videotext);
588 static int __init parse_tag_ramdisk(const struct tag *tag)
590 setup_ramdisk((tag->u.ramdisk.flags & 1) == 0,
591 (tag->u.ramdisk.flags & 2) == 0,
592 tag->u.ramdisk.start, tag->u.ramdisk.size);
596 __tagtable(ATAG_RAMDISK, parse_tag_ramdisk);
598 static int __init parse_tag_serialnr(const struct tag *tag)
600 system_serial_low = tag->u.serialnr.low;
601 system_serial_high = tag->u.serialnr.high;
605 __tagtable(ATAG_SERIAL, parse_tag_serialnr);
607 static int __init parse_tag_revision(const struct tag *tag)
609 system_rev = tag->u.revision.rev;
613 __tagtable(ATAG_REVISION, parse_tag_revision);
615 #ifndef CONFIG_CMDLINE_FORCE
616 static int __init parse_tag_cmdline(const struct tag *tag)
618 strlcpy(default_command_line, tag->u.cmdline.cmdline, COMMAND_LINE_SIZE);
622 __tagtable(ATAG_CMDLINE, parse_tag_cmdline);
623 #endif /* CONFIG_CMDLINE_FORCE */
626 * Scan the tag table for this tag, and call its parse function.
627 * The tag table is built by the linker from all the __tagtable
630 static int __init parse_tag(const struct tag *tag)
632 extern struct tagtable __tagtable_begin, __tagtable_end;
635 for (t = &__tagtable_begin; t < &__tagtable_end; t++)
636 if (tag->hdr.tag == t->tag) {
641 return t < &__tagtable_end;
645 * Parse all tags in the list, checking both the global and architecture
646 * specific tag tables.
648 static void __init parse_tags(const struct tag *t)
650 for (; t->hdr.size; t = tag_next(t))
653 "Ignoring unrecognised tag 0x%08x\n",
658 * This holds our defaults.
660 static struct init_tags {
661 struct tag_header hdr1;
662 struct tag_core core;
663 struct tag_header hdr2;
664 struct tag_mem32 mem;
665 struct tag_header hdr3;
666 } init_tags __initdata = {
667 { tag_size(tag_core), ATAG_CORE },
668 { 1, PAGE_SIZE, 0xff },
669 { tag_size(tag_mem32), ATAG_MEM },
670 { MEM_SIZE, PHYS_OFFSET },
674 static void (*init_machine)(void) __initdata;
676 static int __init customize_machine(void)
678 /* customizes platform devices, or adds new ones */
683 arch_initcall(customize_machine);
686 static inline unsigned long long get_total_mem(void)
690 total = max_low_pfn - min_low_pfn;
691 return total << PAGE_SHIFT;
695 * reserve_crashkernel() - reserves memory are for crash kernel
697 * This function reserves memory area given in "crashkernel=" kernel command
698 * line parameter. The memory reserved is used by a dump capture kernel when
699 * primary kernel is crashing.
701 static void __init reserve_crashkernel(void)
703 unsigned long long crash_size, crash_base;
704 unsigned long long total_mem;
707 total_mem = get_total_mem();
708 ret = parse_crashkernel(boot_command_line, total_mem,
709 &crash_size, &crash_base);
713 ret = reserve_bootmem(crash_base, crash_size, BOOTMEM_EXCLUSIVE);
715 printk(KERN_WARNING "crashkernel reservation failed - "
716 "memory is in use (0x%lx)\n", (unsigned long)crash_base);
720 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
721 "for crashkernel (System RAM: %ldMB)\n",
722 (unsigned long)(crash_size >> 20),
723 (unsigned long)(crash_base >> 20),
724 (unsigned long)(total_mem >> 20));
726 crashk_res.start = crash_base;
727 crashk_res.end = crash_base + crash_size - 1;
728 insert_resource(&iomem_resource, &crashk_res);
731 static inline void reserve_crashkernel(void) {}
732 #endif /* CONFIG_KEXEC */
735 * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
736 * is_kdump_kernel() to determine if we are booting after a panic. Hence
737 * ifdef it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
740 #ifdef CONFIG_CRASH_DUMP
742 * elfcorehdr= specifies the location of elf core header stored by the crashed
743 * kernel. This option will be passed by kexec loader to the capture kernel.
745 static int __init setup_elfcorehdr(char *arg)
752 elfcorehdr_addr = memparse(arg, &end);
753 return end > arg ? 0 : -EINVAL;
755 early_param("elfcorehdr", setup_elfcorehdr);
756 #endif /* CONFIG_CRASH_DUMP */
758 void __init setup_arch(char **cmdline_p)
760 struct tag *tags = (struct tag *)&init_tags;
761 struct machine_desc *mdesc;
762 char *from = default_command_line;
767 mdesc = setup_machine(machine_arch_type);
768 machine_name = mdesc->name;
770 if (mdesc->soft_reboot)
774 tags = phys_to_virt(__atags_pointer);
775 else if (mdesc->boot_params)
776 tags = phys_to_virt(mdesc->boot_params);
779 * If we have the old style parameters, convert them to
782 if (tags->hdr.tag != ATAG_CORE)
783 convert_to_tag_list(tags);
784 if (tags->hdr.tag != ATAG_CORE)
785 tags = (struct tag *)&init_tags;
788 mdesc->fixup(mdesc, tags, &from, &meminfo);
790 if (tags->hdr.tag == ATAG_CORE) {
791 if (meminfo.nr_banks != 0)
792 squash_mem_tags(tags);
797 init_mm.start_code = (unsigned long) _text;
798 init_mm.end_code = (unsigned long) _etext;
799 init_mm.end_data = (unsigned long) _edata;
800 init_mm.brk = (unsigned long) _end;
802 /* parse_early_param needs a boot_command_line */
803 strlcpy(boot_command_line, from, COMMAND_LINE_SIZE);
805 /* populate cmd_line too for later use, preserving boot_command_line */
806 strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);
807 *cmdline_p = cmd_line;
811 arm_memblock_init(&meminfo, mdesc);
814 request_standard_resources(&meminfo, mdesc);
819 reserve_crashkernel();
825 * Set up various architecture-specific pointers
827 arch_nr_irqs = mdesc->nr_irqs;
828 init_arch_irq = mdesc->init_irq;
829 system_timer = mdesc->timer;
830 init_machine = mdesc->init_machine;
833 #if defined(CONFIG_VGA_CONSOLE)
834 conswitchp = &vga_con;
835 #elif defined(CONFIG_DUMMY_CONSOLE)
836 conswitchp = &dummy_con;
843 static int __init topology_init(void)
847 for_each_possible_cpu(cpu) {
848 struct cpuinfo_arm *cpuinfo = &per_cpu(cpu_data, cpu);
849 cpuinfo->cpu.hotpluggable = 1;
850 register_cpu(&cpuinfo->cpu, cpu);
855 subsys_initcall(topology_init);
857 #ifdef CONFIG_HAVE_PROC_CPU
858 static int __init proc_cpu_init(void)
860 struct proc_dir_entry *res;
862 res = proc_mkdir("cpu", NULL);
867 fs_initcall(proc_cpu_init);
870 static const char *hwcap_str[] = {
889 static int c_show(struct seq_file *m, void *v)
893 seq_printf(m, "Processor\t: %s rev %d (%s)\n",
894 cpu_name, read_cpuid_id() & 15, elf_platform);
896 #if defined(CONFIG_SMP)
897 for_each_online_cpu(i) {
899 * glibc reads /proc/cpuinfo to determine the number of
900 * online processors, looking for lines beginning with
901 * "processor". Give glibc what it expects.
903 seq_printf(m, "processor\t: %d\n", i);
904 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n",
905 per_cpu(cpu_data, i).loops_per_jiffy / (500000UL/HZ),
906 (per_cpu(cpu_data, i).loops_per_jiffy / (5000UL/HZ)) % 100);
908 #else /* CONFIG_SMP */
909 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
910 loops_per_jiffy / (500000/HZ),
911 (loops_per_jiffy / (5000/HZ)) % 100);
914 /* dump out the processor features */
915 seq_puts(m, "Features\t: ");
917 for (i = 0; hwcap_str[i]; i++)
918 if (elf_hwcap & (1 << i))
919 seq_printf(m, "%s ", hwcap_str[i]);
921 seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24);
922 seq_printf(m, "CPU architecture: %s\n", proc_arch[cpu_architecture()]);
924 if ((read_cpuid_id() & 0x0008f000) == 0x00000000) {
926 seq_printf(m, "CPU part\t: %07x\n", read_cpuid_id() >> 4);
928 if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
930 seq_printf(m, "CPU variant\t: 0x%02x\n",
931 (read_cpuid_id() >> 16) & 127);
934 seq_printf(m, "CPU variant\t: 0x%x\n",
935 (read_cpuid_id() >> 20) & 15);
937 seq_printf(m, "CPU part\t: 0x%03x\n",
938 (read_cpuid_id() >> 4) & 0xfff);
940 seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15);
944 seq_printf(m, "Hardware\t: %s\n", machine_name);
945 seq_printf(m, "Revision\t: %04x\n", system_rev);
946 seq_printf(m, "Serial\t\t: %08x%08x\n",
947 system_serial_high, system_serial_low);
952 static void *c_start(struct seq_file *m, loff_t *pos)
954 return *pos < 1 ? (void *)1 : NULL;
957 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
963 static void c_stop(struct seq_file *m, void *v)
967 const struct seq_operations cpuinfo_op = {