2 * linux/arch/x86-64/kernel/setup.c
4 * Copyright (C) 1995 Linus Torvalds
6 * Nov 2001 Dave Jones <davej@suse.de>
7 * Forked from i386 setup code.
13 * This file handles the architecture-dependent parts of initialization
16 #include <linux/errno.h>
17 #include <linux/sched.h>
18 #include <linux/kernel.h>
20 #include <linux/stddef.h>
21 #include <linux/unistd.h>
22 #include <linux/ptrace.h>
23 #include <linux/slab.h>
24 #include <linux/user.h>
25 #include <linux/a.out.h>
26 #include <linux/tty.h>
27 #include <linux/ioport.h>
28 #include <linux/delay.h>
29 #include <linux/config.h>
30 #include <linux/init.h>
31 #include <linux/initrd.h>
32 #include <linux/highmem.h>
33 #include <linux/bootmem.h>
34 #include <linux/module.h>
35 #include <asm/processor.h>
36 #include <linux/console.h>
37 #include <linux/seq_file.h>
38 #include <linux/root_dev.h>
39 #include <linux/pci.h>
40 #include <linux/acpi.h>
41 #include <linux/kallsyms.h>
42 #include <linux/edd.h>
44 #include <asm/uaccess.h>
45 #include <asm/system.h>
50 #include <video/edid.h>
53 #include <asm/mpspec.h>
54 #include <asm/mmu_context.h>
55 #include <asm/bootsetup.h>
56 #include <asm/proto.h>
57 #include <asm/setup.h>
58 #include <asm/mach_apic.h>
65 struct cpuinfo_x86 boot_cpu_data;
67 unsigned long mmu_cr4_features;
70 EXPORT_SYMBOL(acpi_disabled);
71 #ifdef CONFIG_ACPI_BOOT
72 extern int __initdata acpi_ht;
73 extern acpi_interrupt_flags acpi_sci_flags;
74 int __initdata acpi_force = 0;
77 int acpi_numa __initdata;
79 /* Boot loader ID as an integer, for the benefit of proc_dointvec */
82 unsigned long saved_video_mode;
86 EXPORT_SYMBOL(swiotlb);
92 struct drive_info_struct { char dummy[32]; } drive_info;
93 struct screen_info screen_info;
94 struct sys_desc_table_struct {
95 unsigned short length;
96 unsigned char table[0];
99 struct edid_info edid_info;
102 extern int root_mountflags;
103 extern char _text, _etext, _edata, _end;
105 char command_line[COMMAND_LINE_SIZE];
107 struct resource standard_io_resources[] = {
108 { .name = "dma1", .start = 0x00, .end = 0x1f,
109 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
110 { .name = "pic1", .start = 0x20, .end = 0x21,
111 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
112 { .name = "timer0", .start = 0x40, .end = 0x43,
113 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
114 { .name = "timer1", .start = 0x50, .end = 0x53,
115 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
116 { .name = "keyboard", .start = 0x60, .end = 0x6f,
117 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
118 { .name = "dma page reg", .start = 0x80, .end = 0x8f,
119 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
120 { .name = "pic2", .start = 0xa0, .end = 0xa1,
121 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
122 { .name = "dma2", .start = 0xc0, .end = 0xdf,
123 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
124 { .name = "fpu", .start = 0xf0, .end = 0xff,
125 .flags = IORESOURCE_BUSY | IORESOURCE_IO }
128 #define STANDARD_IO_RESOURCES \
129 (sizeof standard_io_resources / sizeof standard_io_resources[0])
131 #define IORESOURCE_RAM (IORESOURCE_BUSY | IORESOURCE_MEM)
133 struct resource data_resource = {
134 .name = "Kernel data",
137 .flags = IORESOURCE_RAM,
139 struct resource code_resource = {
140 .name = "Kernel code",
143 .flags = IORESOURCE_RAM,
146 #define IORESOURCE_ROM (IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM)
148 static struct resource system_rom_resource = {
149 .name = "System ROM",
152 .flags = IORESOURCE_ROM,
155 static struct resource extension_rom_resource = {
156 .name = "Extension ROM",
159 .flags = IORESOURCE_ROM,
162 static struct resource adapter_rom_resources[] = {
163 { .name = "Adapter ROM", .start = 0xc8000, .end = 0,
164 .flags = IORESOURCE_ROM },
165 { .name = "Adapter ROM", .start = 0, .end = 0,
166 .flags = IORESOURCE_ROM },
167 { .name = "Adapter ROM", .start = 0, .end = 0,
168 .flags = IORESOURCE_ROM },
169 { .name = "Adapter ROM", .start = 0, .end = 0,
170 .flags = IORESOURCE_ROM },
171 { .name = "Adapter ROM", .start = 0, .end = 0,
172 .flags = IORESOURCE_ROM },
173 { .name = "Adapter ROM", .start = 0, .end = 0,
174 .flags = IORESOURCE_ROM }
177 #define ADAPTER_ROM_RESOURCES \
178 (sizeof adapter_rom_resources / sizeof adapter_rom_resources[0])
180 static struct resource video_rom_resource = {
184 .flags = IORESOURCE_ROM,
187 static struct resource video_ram_resource = {
188 .name = "Video RAM area",
191 .flags = IORESOURCE_RAM,
194 #define romsignature(x) (*(unsigned short *)(x) == 0xaa55)
196 static int __init romchecksum(unsigned char *rom, unsigned long length)
198 unsigned char *p, sum = 0;
200 for (p = rom; p < rom + length; p++)
205 static void __init probe_roms(void)
207 unsigned long start, length, upper;
212 upper = adapter_rom_resources[0].start;
213 for (start = video_rom_resource.start; start < upper; start += 2048) {
214 rom = isa_bus_to_virt(start);
215 if (!romsignature(rom))
218 video_rom_resource.start = start;
220 /* 0 < length <= 0x7f * 512, historically */
221 length = rom[2] * 512;
223 /* if checksum okay, trust length byte */
224 if (length && romchecksum(rom, length))
225 video_rom_resource.end = start + length - 1;
227 request_resource(&iomem_resource, &video_rom_resource);
231 start = (video_rom_resource.end + 1 + 2047) & ~2047UL;
236 request_resource(&iomem_resource, &system_rom_resource);
237 upper = system_rom_resource.start;
239 /* check for extension rom (ignore length byte!) */
240 rom = isa_bus_to_virt(extension_rom_resource.start);
241 if (romsignature(rom)) {
242 length = extension_rom_resource.end - extension_rom_resource.start + 1;
243 if (romchecksum(rom, length)) {
244 request_resource(&iomem_resource, &extension_rom_resource);
245 upper = extension_rom_resource.start;
249 /* check for adapter roms on 2k boundaries */
250 for (i = 0; i < ADAPTER_ROM_RESOURCES && start < upper; start += 2048) {
251 rom = isa_bus_to_virt(start);
252 if (!romsignature(rom))
255 /* 0 < length <= 0x7f * 512, historically */
256 length = rom[2] * 512;
258 /* but accept any length that fits if checksum okay */
259 if (!length || start + length > upper || !romchecksum(rom, length))
262 adapter_rom_resources[i].start = start;
263 adapter_rom_resources[i].end = start + length - 1;
264 request_resource(&iomem_resource, &adapter_rom_resources[i]);
266 start = adapter_rom_resources[i++].end & ~2047UL;
270 static __init void parse_cmdline_early (char ** cmdline_p)
272 char c = ' ', *to = command_line, *from = COMMAND_LINE;
275 /* Save unparsed command line copy for /proc/cmdline */
276 memcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
277 saved_command_line[COMMAND_LINE_SIZE-1] = '\0';
285 * If the BIOS enumerates physical processors before logical,
286 * maxcpus=N at enumeration-time can be used to disable HT.
288 else if (!memcmp(from, "maxcpus=", 8)) {
289 extern unsigned int maxcpus;
291 maxcpus = simple_strtoul(from + 8, NULL, 0);
294 #ifdef CONFIG_ACPI_BOOT
295 /* "acpi=off" disables both ACPI table parsing and interpreter init */
296 if (!memcmp(from, "acpi=off", 8))
299 if (!memcmp(from, "acpi=force", 10)) {
300 /* add later when we do DMI horrors: */
305 /* acpi=ht just means: do ACPI MADT parsing
306 at bootup, but don't enable the full ACPI interpreter */
307 if (!memcmp(from, "acpi=ht", 7)) {
312 else if (!memcmp(from, "pci=noacpi", 10))
314 else if (!memcmp(from, "acpi=noirq", 10))
317 else if (!memcmp(from, "acpi_sci=edge", 13))
318 acpi_sci_flags.trigger = 1;
319 else if (!memcmp(from, "acpi_sci=level", 14))
320 acpi_sci_flags.trigger = 3;
321 else if (!memcmp(from, "acpi_sci=high", 13))
322 acpi_sci_flags.polarity = 1;
323 else if (!memcmp(from, "acpi_sci=low", 12))
324 acpi_sci_flags.polarity = 3;
326 /* acpi=strict disables out-of-spec workarounds */
327 else if (!memcmp(from, "acpi=strict", 11)) {
330 #ifdef CONFIG_X86_IO_APIC
331 else if (!memcmp(from, "acpi_skip_timer_override", 24))
332 acpi_skip_timer_override = 1;
336 if (!memcmp(from, "nolapic", 7) ||
337 !memcmp(from, "disableapic", 11))
340 if (!memcmp(from, "noapic", 6))
341 skip_ioapic_setup = 1;
343 if (!memcmp(from, "apic", 4)) {
344 skip_ioapic_setup = 0;
348 if (!memcmp(from, "mem=", 4))
349 parse_memopt(from+4, &from);
351 #ifdef CONFIG_DISCONTIGMEM
352 if (!memcmp(from, "numa=", 5))
356 #ifdef CONFIG_GART_IOMMU
357 if (!memcmp(from,"iommu=",6)) {
362 if (!memcmp(from,"oops=panic", 10))
365 if (!memcmp(from, "noexec=", 7))
366 nonx_setup(from + 7);
372 if (COMMAND_LINE_SIZE <= ++len)
377 *cmdline_p = command_line;
380 #ifndef CONFIG_DISCONTIGMEM
381 static void __init contig_initmem_init(void)
383 unsigned long bootmap_size, bootmap;
384 bootmap_size = bootmem_bootmap_pages(end_pfn)<<PAGE_SHIFT;
385 bootmap = find_e820_area(0, end_pfn<<PAGE_SHIFT, bootmap_size);
387 panic("Cannot find bootmem map of size %ld\n",bootmap_size);
388 bootmap_size = init_bootmem(bootmap >> PAGE_SHIFT, end_pfn);
389 e820_bootmem_free(&contig_page_data, 0, end_pfn << PAGE_SHIFT);
390 reserve_bootmem(bootmap, bootmap_size);
394 /* Use inline assembly to define this because the nops are defined
395 as inline assembly strings in the include files and we cannot
396 get them easily into strings. */
397 asm("\t.data\nk8nops: "
398 K8_NOP1 K8_NOP2 K8_NOP3 K8_NOP4 K8_NOP5 K8_NOP6
401 extern unsigned char k8nops[];
402 static unsigned char *k8_nops[ASM_NOP_MAX+1] = {
408 k8nops + 1 + 2 + 3 + 4,
409 k8nops + 1 + 2 + 3 + 4 + 5,
410 k8nops + 1 + 2 + 3 + 4 + 5 + 6,
411 k8nops + 1 + 2 + 3 + 4 + 5 + 6 + 7,
414 /* Replace instructions with better alternatives for this CPU type.
416 This runs before SMP is initialized to avoid SMP problems with
417 self modifying code. This implies that assymetric systems where
418 APs have less capabilities than the boot processor are not handled.
419 In this case boot with "noreplacement". */
420 void apply_alternatives(void *start, void *end)
424 for (a = start; (void *)a < end; a++) {
425 if (!boot_cpu_has(a->cpuid))
428 BUG_ON(a->replacementlen > a->instrlen);
429 __inline_memcpy(a->instr, a->replacement, a->replacementlen);
430 diff = a->instrlen - a->replacementlen;
432 /* Pad the rest with nops */
433 for (i = a->replacementlen; diff > 0; diff -= k, i += k) {
437 __inline_memcpy(a->instr + i, k8_nops[k], k);
442 static int no_replacement __initdata = 0;
444 void __init alternative_instructions(void)
446 extern struct alt_instr __alt_instructions[], __alt_instructions_end[];
449 apply_alternatives(__alt_instructions, __alt_instructions_end);
452 static int __init noreplacement_setup(char *s)
458 __setup("noreplacement", noreplacement_setup);
460 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
462 #ifdef CONFIG_EDD_MODULE
466 * copy_edd() - Copy the BIOS EDD information
467 * from boot_params into a safe place.
470 static inline void copy_edd(void)
472 memcpy(edd.mbr_signature, EDD_MBR_SIGNATURE, sizeof(edd.mbr_signature));
473 memcpy(edd.edd_info, EDD_BUF, sizeof(edd.edd_info));
474 edd.mbr_signature_nr = EDD_MBR_SIG_NR;
475 edd.edd_info_nr = EDD_NR;
478 static inline void copy_edd(void)
483 #define EBDA_ADDR_POINTER 0x40E
484 static void __init reserve_ebda_region(void)
488 * there is a real-mode segmented pointer pointing to the
489 * 4K EBDA area at 0x40E
491 addr = *(unsigned short *)phys_to_virt(EBDA_ADDR_POINTER);
494 reserve_bootmem_generic(addr, PAGE_SIZE);
497 void __init setup_arch(char **cmdline_p)
499 unsigned long kernel_end;
501 ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
502 drive_info = DRIVE_INFO;
503 screen_info = SCREEN_INFO;
504 edid_info = EDID_INFO;
505 saved_video_mode = SAVED_VIDEO_MODE;
506 bootloader_type = LOADER_TYPE;
508 #ifdef CONFIG_BLK_DEV_RAM
509 rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
510 rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
511 rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
513 setup_memory_region();
516 if (!MOUNT_ROOT_RDONLY)
517 root_mountflags &= ~MS_RDONLY;
518 init_mm.start_code = (unsigned long) &_text;
519 init_mm.end_code = (unsigned long) &_etext;
520 init_mm.end_data = (unsigned long) &_edata;
521 init_mm.brk = (unsigned long) &_end;
523 code_resource.start = virt_to_phys(&_text);
524 code_resource.end = virt_to_phys(&_etext)-1;
525 data_resource.start = virt_to_phys(&_etext);
526 data_resource.end = virt_to_phys(&_edata)-1;
528 parse_cmdline_early(cmdline_p);
530 early_identify_cpu(&boot_cpu_data);
533 * partially used pages are not usable - thus
534 * we are rounding upwards:
536 end_pfn = e820_end_of_ram();
540 init_memory_mapping(0, (end_pfn_map << PAGE_SHIFT));
542 #ifdef CONFIG_ACPI_BOOT
544 * Initialize the ACPI boot-time table parser (gets the RSDP and SDT).
545 * Call this early for SRAT node setup.
547 acpi_boot_table_init();
550 #ifdef CONFIG_ACPI_NUMA
552 * Parse SRAT to discover nodes.
557 #ifdef CONFIG_DISCONTIGMEM
558 numa_initmem_init(0, end_pfn);
560 contig_initmem_init();
563 /* Reserve direct mapping */
564 reserve_bootmem_generic(table_start << PAGE_SHIFT,
565 (table_end - table_start) << PAGE_SHIFT);
568 kernel_end = round_up(__pa_symbol(&_end),PAGE_SIZE);
569 reserve_bootmem_generic(HIGH_MEMORY, kernel_end - HIGH_MEMORY);
572 * reserve physical page 0 - it's a special BIOS page on many boxes,
573 * enabling clean reboots, SMP operation, laptop functions.
575 reserve_bootmem_generic(0, PAGE_SIZE);
577 /* reserve ebda region */
578 reserve_ebda_region();
582 * But first pinch a few for the stack/trampoline stuff
583 * FIXME: Don't need the extra page at 4K, but need to fix
584 * trampoline before removing it. (see the GDT stuff)
586 reserve_bootmem_generic(PAGE_SIZE, PAGE_SIZE);
588 /* Reserve SMP trampoline */
589 reserve_bootmem_generic(SMP_TRAMPOLINE_BASE, PAGE_SIZE);
592 #ifdef CONFIG_ACPI_SLEEP
594 * Reserve low memory region for sleep support.
596 acpi_reserve_bootmem();
598 #ifdef CONFIG_X86_LOCAL_APIC
600 * Find and reserve possible boot-time SMP configuration:
604 #ifdef CONFIG_BLK_DEV_INITRD
605 if (LOADER_TYPE && INITRD_START) {
606 if (INITRD_START + INITRD_SIZE <= (end_pfn << PAGE_SHIFT)) {
607 reserve_bootmem_generic(INITRD_START, INITRD_SIZE);
609 INITRD_START ? INITRD_START + PAGE_OFFSET : 0;
610 initrd_end = initrd_start+INITRD_SIZE;
613 printk(KERN_ERR "initrd extends beyond end of memory "
614 "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
615 (unsigned long)(INITRD_START + INITRD_SIZE),
616 (unsigned long)(end_pfn << PAGE_SHIFT));
625 #ifdef CONFIG_ACPI_BOOT
627 * Read APIC and some other early information from ACPI tables.
632 #ifdef CONFIG_X86_LOCAL_APIC
634 * get boot-time SMP configuration:
636 if (smp_found_config)
638 init_apic_mappings();
642 * Request address space for all standard RAM and ROM resources
643 * and also for regions reported as reserved by the e820.
646 e820_reserve_resources();
648 request_resource(&iomem_resource, &video_ram_resource);
652 /* request I/O space for devices used on all i[345]86 PCs */
653 for (i = 0; i < STANDARD_IO_RESOURCES; i++)
654 request_resource(&ioport_resource, &standard_io_resources[i]);
659 #ifdef CONFIG_GART_IOMMU
664 #if defined(CONFIG_VGA_CONSOLE)
665 conswitchp = &vga_con;
666 #elif defined(CONFIG_DUMMY_CONSOLE)
667 conswitchp = &dummy_con;
672 static int __init get_model_name(struct cpuinfo_x86 *c)
676 if (c->extended_cpuid_level < 0x80000004)
679 v = (unsigned int *) c->x86_model_id;
680 cpuid(0x80000002, &v[0], &v[1], &v[2], &v[3]);
681 cpuid(0x80000003, &v[4], &v[5], &v[6], &v[7]);
682 cpuid(0x80000004, &v[8], &v[9], &v[10], &v[11]);
683 c->x86_model_id[48] = 0;
688 static void __init display_cacheinfo(struct cpuinfo_x86 *c)
690 unsigned int n, dummy, eax, ebx, ecx, edx;
692 n = c->extended_cpuid_level;
694 if (n >= 0x80000005) {
695 cpuid(0x80000005, &dummy, &ebx, &ecx, &edx);
696 printk(KERN_INFO "CPU: L1 I Cache: %dK (%d bytes/line), D cache %dK (%d bytes/line)\n",
697 edx>>24, edx&0xFF, ecx>>24, ecx&0xFF);
698 c->x86_cache_size=(ecx>>24)+(edx>>24);
699 /* On K8 L1 TLB is inclusive, so don't count it */
703 if (n >= 0x80000006) {
704 cpuid(0x80000006, &dummy, &ebx, &ecx, &edx);
705 ecx = cpuid_ecx(0x80000006);
706 c->x86_cache_size = ecx >> 16;
707 c->x86_tlbsize += ((ebx >> 16) & 0xfff) + (ebx & 0xfff);
709 printk(KERN_INFO "CPU: L2 Cache: %dK (%d bytes/line)\n",
710 c->x86_cache_size, ecx & 0xFF);
714 cpuid(0x80000007, &dummy, &dummy, &dummy, &c->x86_power);
715 if (n >= 0x80000008) {
716 cpuid(0x80000008, &eax, &dummy, &dummy, &dummy);
717 c->x86_virt_bits = (eax >> 8) & 0xff;
718 c->x86_phys_bits = eax & 0xff;
724 * On a AMD dual core setup the lower bits of the APIC id distingush the cores.
725 * Assumes number of cores is a power of two.
727 static void __init amd_detect_cmp(struct cpuinfo_x86 *c)
730 int cpu = c->x86_apicid;
732 if (c->x86_num_cores == 1)
734 cpu_core_id[cpu] = cpu >> hweight32(c->x86_num_cores - 1);
737 /* When an ACPI SRAT table is available use the mappings from SRAT
739 if (acpi_numa <= 0) {
740 node = cpu_core_id[cpu];
741 if (!node_online(node))
742 node = first_node(node_online_map);
743 cpu_to_node[cpu] = node;
745 node = cpu_to_node[cpu];
748 printk(KERN_INFO "CPU %d(%d) -> Node %d -> Core %d\n",
749 cpu, c->x86_num_cores, node, cpu_core_id[cpu]);
753 static void __init amd_detect_cmp(struct cpuinfo_x86 *c)
758 static int __init init_amd(struct cpuinfo_x86 *c)
763 /* Bit 31 in normal CPUID used for nonstandard 3DNow ID;
764 3DNow is IDd by bit 31 in extended CPUID (1*32+31) anyway */
765 clear_bit(0*32+31, &c->x86_capability);
768 level = cpuid_eax(1);
769 if ((level >= 0x0f48 && level < 0x0f50) || level >= 0x0f58)
770 set_bit(X86_FEATURE_K8_C, &c->x86_capability);
772 r = get_model_name(c);
776 /* Should distinguish Models here, but this is only
777 a fallback anyways. */
778 strcpy(c->x86_model_id, "Hammer");
782 display_cacheinfo(c);
784 if (c->extended_cpuid_level >= 0x80000008) {
785 c->x86_num_cores = (cpuid_ecx(0x80000008) & 0xff) + 1;
786 if (c->x86_num_cores & (c->x86_num_cores - 1))
787 c->x86_num_cores = 1;
795 static void __init detect_ht(struct cpuinfo_x86 *c)
798 u32 eax, ebx, ecx, edx;
800 int cpu = smp_processor_id();
802 if (!cpu_has(c, X86_FEATURE_HT) || cpu_has(c, X86_FEATURE_CMP_LEGACY))
805 cpuid(1, &eax, &ebx, &ecx, &edx);
806 smp_num_siblings = (ebx & 0xff0000) >> 16;
808 if (smp_num_siblings == 1) {
809 printk(KERN_INFO "CPU: Hyper-Threading is disabled\n");
810 } else if (smp_num_siblings > 1) {
813 * At this point we only support two siblings per
816 if (smp_num_siblings > NR_CPUS) {
817 printk(KERN_WARNING "CPU: Unsupported number of the siblings %d", smp_num_siblings);
818 smp_num_siblings = 1;
821 tmp = smp_num_siblings;
822 while ((tmp & 0x80000000 ) == 0) {
826 if (smp_num_siblings & (smp_num_siblings - 1))
828 phys_proc_id[cpu] = phys_pkg_id(index_msb);
830 printk(KERN_INFO "CPU: Physical Processor ID: %d\n",
833 smp_num_siblings = smp_num_siblings / c->x86_num_cores;
835 tmp = smp_num_siblings;
837 while ((tmp & 0x80000000) == 0) {
841 if (smp_num_siblings & (smp_num_siblings - 1))
844 cpu_core_id[cpu] = phys_pkg_id(index_msb);
846 if (c->x86_num_cores > 1)
847 printk(KERN_INFO "CPU: Processor Core ID: %d\n",
854 * find out the number of processor cores on the die
856 static int __init intel_num_cpu_cores(struct cpuinfo_x86 *c)
860 if (c->cpuid_level < 4)
869 return ((eax >> 26) + 1);
874 static void __init init_intel(struct cpuinfo_x86 *c)
879 init_intel_cacheinfo(c);
880 n = c->extended_cpuid_level;
881 if (n >= 0x80000008) {
882 unsigned eax = cpuid_eax(0x80000008);
883 c->x86_virt_bits = (eax >> 8) & 0xff;
884 c->x86_phys_bits = eax & 0xff;
888 c->x86_cache_alignment = c->x86_clflush_size * 2;
890 set_bit(X86_FEATURE_CONSTANT_TSC, &c->x86_capability);
891 c->x86_num_cores = intel_num_cpu_cores(c);
894 void __init get_cpu_vendor(struct cpuinfo_x86 *c)
896 char *v = c->x86_vendor_id;
898 if (!strcmp(v, "AuthenticAMD"))
899 c->x86_vendor = X86_VENDOR_AMD;
900 else if (!strcmp(v, "GenuineIntel"))
901 c->x86_vendor = X86_VENDOR_INTEL;
903 c->x86_vendor = X86_VENDOR_UNKNOWN;
906 struct cpu_model_info {
909 char *model_names[16];
912 /* Do some early cpuid on the boot CPU to get some parameter that are
913 needed before check_bugs. Everything advanced is in identify_cpu
915 void __init early_identify_cpu(struct cpuinfo_x86 *c)
919 c->loops_per_jiffy = loops_per_jiffy;
920 c->x86_cache_size = -1;
921 c->x86_vendor = X86_VENDOR_UNKNOWN;
922 c->x86_model = c->x86_mask = 0; /* So far unknown... */
923 c->x86_vendor_id[0] = '\0'; /* Unset */
924 c->x86_model_id[0] = '\0'; /* Unset */
925 c->x86_clflush_size = 64;
926 c->x86_cache_alignment = c->x86_clflush_size;
927 c->x86_num_cores = 1;
928 c->x86_apicid = c == &boot_cpu_data ? 0 : c - cpu_data;
929 c->extended_cpuid_level = 0;
930 memset(&c->x86_capability, 0, sizeof c->x86_capability);
932 /* Get vendor name */
933 cpuid(0x00000000, (unsigned int *)&c->cpuid_level,
934 (unsigned int *)&c->x86_vendor_id[0],
935 (unsigned int *)&c->x86_vendor_id[8],
936 (unsigned int *)&c->x86_vendor_id[4]);
940 /* Initialize the standard set of capabilities */
941 /* Note that the vendor-specific code below might override */
943 /* Intel-defined flags: level 0x00000001 */
944 if (c->cpuid_level >= 0x00000001) {
946 cpuid(0x00000001, &tfms, &misc, &c->x86_capability[4],
947 &c->x86_capability[0]);
948 c->x86 = (tfms >> 8) & 0xf;
949 c->x86_model = (tfms >> 4) & 0xf;
950 c->x86_mask = tfms & 0xf;
952 c->x86 += (tfms >> 20) & 0xff;
953 c->x86_model += ((tfms >> 16) & 0xF) << 4;
955 if (c->x86_capability[0] & (1<<19))
956 c->x86_clflush_size = ((misc >> 8) & 0xff) * 8;
957 c->x86_apicid = misc >> 24;
959 /* Have CPUID level 0 only - unheard of */
965 * This does the hard work of actually picking apart the CPU stuff...
967 void __init identify_cpu(struct cpuinfo_x86 *c)
972 early_identify_cpu(c);
974 /* AMD-defined flags: level 0x80000001 */
975 xlvl = cpuid_eax(0x80000000);
976 c->extended_cpuid_level = xlvl;
977 if ((xlvl & 0xffff0000) == 0x80000000) {
978 if (xlvl >= 0x80000001) {
979 c->x86_capability[1] = cpuid_edx(0x80000001);
980 c->x86_capability[5] = cpuid_ecx(0x80000001);
982 if (xlvl >= 0x80000004)
983 get_model_name(c); /* Default name */
986 /* Transmeta-defined flags: level 0x80860001 */
987 xlvl = cpuid_eax(0x80860000);
988 if ((xlvl & 0xffff0000) == 0x80860000) {
989 /* Don't set x86_cpuid_level here for now to not confuse. */
990 if (xlvl >= 0x80860001)
991 c->x86_capability[2] = cpuid_edx(0x80860001);
995 * Vendor-specific initialization. In this section we
996 * canonicalize the feature flags, meaning if there are
997 * features a certain CPU supports which CPUID doesn't
998 * tell us, CPUID claiming incorrect flags, or other bugs,
999 * we handle them here.
1001 * At the end of this section, c->x86_capability better
1002 * indicate the features this CPU genuinely supports!
1004 switch (c->x86_vendor) {
1005 case X86_VENDOR_AMD:
1009 case X86_VENDOR_INTEL:
1013 case X86_VENDOR_UNKNOWN:
1015 display_cacheinfo(c);
1019 select_idle_routine(c);
1023 * On SMP, boot_cpu_data holds the common feature set between
1024 * all CPUs; so make sure that we indicate which features are
1025 * common between the CPUs. The first time this routine gets
1026 * executed, c == &boot_cpu_data.
1028 if (c != &boot_cpu_data) {
1029 /* AND the already accumulated flags with these */
1030 for (i = 0 ; i < NCAPINTS ; i++)
1031 boot_cpu_data.x86_capability[i] &= c->x86_capability[i];
1034 #ifdef CONFIG_X86_MCE
1038 if (c != &boot_cpu_data)
1039 numa_add_cpu(c - cpu_data);
1044 void __init print_cpu_info(struct cpuinfo_x86 *c)
1046 if (c->x86_model_id[0])
1047 printk("%s", c->x86_model_id);
1049 if (c->x86_mask || c->cpuid_level >= 0)
1050 printk(" stepping %02x\n", c->x86_mask);
1056 * Get CPU information for use by the procfs.
1059 static int show_cpuinfo(struct seq_file *m, void *v)
1061 struct cpuinfo_x86 *c = v;
1064 * These flag bits must match the definitions in <asm/cpufeature.h>.
1065 * NULL means this bit is undefined or reserved; either way it doesn't
1066 * have meaning as far as Linux is concerned. Note that it's important
1067 * to realize there is a difference between this table and CPUID -- if
1068 * applications want to get the raw CPUID data, they should access
1069 * /dev/cpu/<cpu_nr>/cpuid instead.
1071 static char *x86_cap_flags[] = {
1073 "fpu", "vme", "de", "pse", "tsc", "msr", "pae", "mce",
1074 "cx8", "apic", NULL, "sep", "mtrr", "pge", "mca", "cmov",
1075 "pat", "pse36", "pn", "clflush", NULL, "dts", "acpi", "mmx",
1076 "fxsr", "sse", "sse2", "ss", "ht", "tm", "ia64", NULL,
1079 "pni", NULL, NULL, NULL, NULL, NULL, NULL, NULL,
1080 NULL, NULL, NULL, "syscall", NULL, NULL, NULL, NULL,
1081 NULL, NULL, NULL, NULL, "nx", NULL, "mmxext", NULL,
1082 NULL, "fxsr_opt", NULL, NULL, NULL, "lm", "3dnowext", "3dnow",
1084 /* Transmeta-defined */
1085 "recovery", "longrun", NULL, "lrti", NULL, NULL, NULL, NULL,
1086 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
1087 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
1088 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
1090 /* Other (Linux-defined) */
1091 "cxmmx", NULL, "cyrix_arr", "centaur_mcr", "k8c+",
1092 "constant_tsc", NULL, NULL,
1093 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
1094 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
1095 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
1097 /* Intel-defined (#2) */
1098 "pni", NULL, NULL, "monitor", "ds_cpl", NULL, NULL, "est",
1099 "tm2", NULL, "cid", NULL, NULL, "cx16", "xtpr", NULL,
1100 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
1101 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
1103 /* AMD-defined (#2) */
1104 "lahf_lm", "cmp_legacy", NULL, NULL, NULL, NULL, NULL, NULL,
1105 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
1106 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
1107 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
1109 static char *x86_power_flags[] = {
1110 "ts", /* temperature sensor */
1111 "fid", /* frequency id control */
1112 "vid", /* voltage id control */
1113 "ttp", /* thermal trip */
1120 if (!cpu_online(c-cpu_data))
1124 seq_printf(m,"processor\t: %u\n"
1126 "cpu family\t: %d\n"
1128 "model name\t: %s\n",
1129 (unsigned)(c-cpu_data),
1130 c->x86_vendor_id[0] ? c->x86_vendor_id : "unknown",
1133 c->x86_model_id[0] ? c->x86_model_id : "unknown");
1135 if (c->x86_mask || c->cpuid_level >= 0)
1136 seq_printf(m, "stepping\t: %d\n", c->x86_mask);
1138 seq_printf(m, "stepping\t: unknown\n");
1140 if (cpu_has(c,X86_FEATURE_TSC)) {
1141 seq_printf(m, "cpu MHz\t\t: %u.%03u\n",
1142 cpu_khz / 1000, (cpu_khz % 1000));
1146 if (c->x86_cache_size >= 0)
1147 seq_printf(m, "cache size\t: %d KB\n", c->x86_cache_size);
1150 if (smp_num_siblings * c->x86_num_cores > 1) {
1151 int cpu = c - cpu_data;
1152 seq_printf(m, "physical id\t: %d\n", phys_proc_id[cpu]);
1153 seq_printf(m, "siblings\t: %d\n",
1154 c->x86_num_cores * smp_num_siblings);
1155 seq_printf(m, "core id\t\t: %d\n", cpu_core_id[cpu]);
1156 seq_printf(m, "cpu cores\t: %d\n", c->x86_num_cores);
1162 "fpu_exception\t: yes\n"
1163 "cpuid level\t: %d\n"
1170 for ( i = 0 ; i < 32*NCAPINTS ; i++ )
1171 if ( test_bit(i, &c->x86_capability) &&
1172 x86_cap_flags[i] != NULL )
1173 seq_printf(m, " %s", x86_cap_flags[i]);
1176 seq_printf(m, "\nbogomips\t: %lu.%02lu\n",
1177 c->loops_per_jiffy/(500000/HZ),
1178 (c->loops_per_jiffy/(5000/HZ)) % 100);
1180 if (c->x86_tlbsize > 0)
1181 seq_printf(m, "TLB size\t: %d 4K pages\n", c->x86_tlbsize);
1182 seq_printf(m, "clflush size\t: %d\n", c->x86_clflush_size);
1183 seq_printf(m, "cache_alignment\t: %d\n", c->x86_cache_alignment);
1185 seq_printf(m, "address sizes\t: %u bits physical, %u bits virtual\n",
1186 c->x86_phys_bits, c->x86_virt_bits);
1188 seq_printf(m, "power management:");
1191 for (i = 0; i < 32; i++)
1192 if (c->x86_power & (1 << i)) {
1193 if (i < ARRAY_SIZE(x86_power_flags))
1194 seq_printf(m, " %s", x86_power_flags[i]);
1196 seq_printf(m, " [%d]", i);
1200 seq_printf(m, "\n\n");
1205 static void *c_start(struct seq_file *m, loff_t *pos)
1207 return *pos < NR_CPUS ? cpu_data + *pos : NULL;
1210 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
1213 return c_start(m, pos);
1216 static void c_stop(struct seq_file *m, void *v)
1220 struct seq_operations cpuinfo_op = {
1224 .show = show_cpuinfo,