2 * Copyright (C) 1995 Linus Torvalds
6 * This file handles the architecture-dependent parts of initialization
9 #include <linux/errno.h>
10 #include <linux/sched.h>
11 #include <linux/kernel.h>
13 #include <linux/stddef.h>
14 #include <linux/unistd.h>
15 #include <linux/ptrace.h>
16 #include <linux/slab.h>
17 #include <linux/user.h>
18 #include <linux/a.out.h>
19 #include <linux/screen_info.h>
20 #include <linux/ioport.h>
21 #include <linux/delay.h>
22 #include <linux/init.h>
23 #include <linux/initrd.h>
24 #include <linux/highmem.h>
25 #include <linux/bootmem.h>
26 #include <linux/module.h>
27 #include <asm/processor.h>
28 #include <linux/console.h>
29 #include <linux/seq_file.h>
30 #include <linux/crash_dump.h>
31 #include <linux/root_dev.h>
32 #include <linux/pci.h>
33 #include <linux/efi.h>
34 #include <linux/acpi.h>
35 #include <linux/kallsyms.h>
36 #include <linux/edd.h>
37 #include <linux/mmzone.h>
38 #include <linux/kexec.h>
39 #include <linux/cpufreq.h>
40 #include <linux/dmi.h>
41 #include <linux/dma-mapping.h>
42 #include <linux/ctype.h>
43 #include <linux/uaccess.h>
46 #include <asm/uaccess.h>
47 #include <asm/system.h>
48 #include <asm/vsyscall.h>
53 #include <video/edid.h>
57 #include <asm/mpspec.h>
58 #include <asm/mmu_context.h>
59 #include <asm/proto.h>
60 #include <asm/setup.h>
61 #include <asm/mach_apic.h>
63 #include <asm/sections.h>
65 #include <asm/cacheflush.h>
68 #include <asm/topology.h>
70 #ifdef CONFIG_PARAVIRT
71 #include <asm/paravirt.h>
80 struct cpuinfo_x86 boot_cpu_data __read_mostly;
81 EXPORT_SYMBOL(boot_cpu_data);
83 unsigned long mmu_cr4_features;
85 /* Boot loader ID as an integer, for the benefit of proc_dointvec */
88 unsigned long saved_video_mode;
90 int force_mwait __cpuinitdata;
96 char dmi_alloc_data[DMI_MAX_DATA];
101 struct screen_info screen_info;
102 EXPORT_SYMBOL(screen_info);
103 struct sys_desc_table_struct {
104 unsigned short length;
105 unsigned char table[0];
108 struct edid_info edid_info;
109 EXPORT_SYMBOL_GPL(edid_info);
111 extern int root_mountflags;
113 char __initdata command_line[COMMAND_LINE_SIZE];
115 struct resource standard_io_resources[] = {
116 { .name = "dma1", .start = 0x00, .end = 0x1f,
117 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
118 { .name = "pic1", .start = 0x20, .end = 0x21,
119 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
120 { .name = "timer0", .start = 0x40, .end = 0x43,
121 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
122 { .name = "timer1", .start = 0x50, .end = 0x53,
123 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
124 { .name = "keyboard", .start = 0x60, .end = 0x6f,
125 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
126 { .name = "dma page reg", .start = 0x80, .end = 0x8f,
127 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
128 { .name = "pic2", .start = 0xa0, .end = 0xa1,
129 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
130 { .name = "dma2", .start = 0xc0, .end = 0xdf,
131 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
132 { .name = "fpu", .start = 0xf0, .end = 0xff,
133 .flags = IORESOURCE_BUSY | IORESOURCE_IO }
136 #define IORESOURCE_RAM (IORESOURCE_BUSY | IORESOURCE_MEM)
138 static struct resource data_resource = {
139 .name = "Kernel data",
142 .flags = IORESOURCE_RAM,
144 static struct resource code_resource = {
145 .name = "Kernel code",
148 .flags = IORESOURCE_RAM,
150 static struct resource bss_resource = {
151 .name = "Kernel bss",
154 .flags = IORESOURCE_RAM,
157 static void __cpuinit early_identify_cpu(struct cpuinfo_x86 *c);
159 #ifdef CONFIG_PROC_VMCORE
160 /* elfcorehdr= specifies the location of elf core header
161 * stored by the crashed kernel. This option will be passed
162 * by kexec loader to the capture kernel.
164 static int __init setup_elfcorehdr(char *arg)
169 elfcorehdr_addr = memparse(arg, &end);
170 return end > arg ? 0 : -EINVAL;
172 early_param("elfcorehdr", setup_elfcorehdr);
177 contig_initmem_init(unsigned long start_pfn, unsigned long end_pfn)
179 unsigned long bootmap_size, bootmap;
181 bootmap_size = bootmem_bootmap_pages(end_pfn)<<PAGE_SHIFT;
182 bootmap = find_e820_area(0, end_pfn<<PAGE_SHIFT, bootmap_size);
184 panic("Cannot find bootmem map of size %ld\n", bootmap_size);
185 bootmap_size = init_bootmem(bootmap >> PAGE_SHIFT, end_pfn);
186 e820_register_active_regions(0, start_pfn, end_pfn);
187 free_bootmem_with_active_regions(0, end_pfn);
188 reserve_bootmem(bootmap, bootmap_size);
192 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
194 #ifdef CONFIG_EDD_MODULE
198 * copy_edd() - Copy the BIOS EDD information
199 * from boot_params into a safe place.
202 static inline void copy_edd(void)
204 memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
205 sizeof(edd.mbr_signature));
206 memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
207 edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
208 edd.edd_info_nr = boot_params.eddbuf_entries;
211 static inline void copy_edd(void)
217 static void __init reserve_crashkernel(void)
219 unsigned long long free_mem;
220 unsigned long long crash_size, crash_base;
224 ((unsigned long long)max_low_pfn - min_low_pfn) << PAGE_SHIFT;
226 ret = parse_crashkernel(boot_command_line, free_mem,
227 &crash_size, &crash_base);
228 if (ret == 0 && crash_size) {
229 if (crash_base > 0) {
230 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
231 "for crashkernel (System RAM: %ldMB)\n",
232 (unsigned long)(crash_size >> 20),
233 (unsigned long)(crash_base >> 20),
234 (unsigned long)(free_mem >> 20));
235 crashk_res.start = crash_base;
236 crashk_res.end = crash_base + crash_size - 1;
237 reserve_bootmem(crash_base, crash_size);
239 printk(KERN_INFO "crashkernel reservation failed - "
240 "you have to specify a base address\n");
244 static inline void __init reserve_crashkernel(void)
248 /* Overridden in paravirt.c if CONFIG_PARAVIRT */
249 void __attribute__((weak)) __init memory_setup(void)
251 machine_specific_memory_setup();
254 void __init setup_arch(char **cmdline_p)
258 printk(KERN_INFO "Command line: %s\n", boot_command_line);
260 ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
261 screen_info = boot_params.screen_info;
262 edid_info = boot_params.edid_info;
263 saved_video_mode = boot_params.hdr.vid_mode;
264 bootloader_type = boot_params.hdr.type_of_loader;
266 #ifdef CONFIG_BLK_DEV_RAM
267 rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
268 rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
269 rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
272 if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
282 if (!boot_params.hdr.root_flags)
283 root_mountflags &= ~MS_RDONLY;
284 init_mm.start_code = (unsigned long) &_text;
285 init_mm.end_code = (unsigned long) &_etext;
286 init_mm.end_data = (unsigned long) &_edata;
287 init_mm.brk = (unsigned long) &_end;
289 code_resource.start = virt_to_phys(&_text);
290 code_resource.end = virt_to_phys(&_etext)-1;
291 data_resource.start = virt_to_phys(&_etext);
292 data_resource.end = virt_to_phys(&_edata)-1;
293 bss_resource.start = virt_to_phys(&__bss_start);
294 bss_resource.end = virt_to_phys(&__bss_stop)-1;
296 early_identify_cpu(&boot_cpu_data);
298 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
299 *cmdline_p = command_line;
303 finish_e820_parsing();
305 early_gart_iommu_check();
307 e820_register_active_regions(0, 0, -1UL);
309 * partially used pages are not usable - thus
310 * we are rounding upwards:
312 end_pfn = e820_end_of_ram();
313 /* update e820 for memory not covered by WB MTRRs */
315 if (mtrr_trim_uncached_memory(end_pfn)) {
316 e820_register_active_regions(0, 0, -1UL);
317 end_pfn = e820_end_of_ram();
320 num_physpages = end_pfn;
324 init_memory_mapping(0, (end_pfn_map << PAGE_SHIFT));
333 /* setup to use the early static init tables during kernel startup */
334 x86_cpu_to_apicid_early_ptr = (void *)&x86_cpu_to_apicid_init;
336 x86_cpu_to_node_map_early_ptr = (void *)&x86_cpu_to_node_map_init;
338 x86_bios_cpu_apicid_early_ptr = (void *)&x86_bios_cpu_apicid_init;
343 * Initialize the ACPI boot-time table parser (gets the RSDP and SDT).
344 * Call this early for SRAT node setup.
346 acpi_boot_table_init();
349 /* How many end-of-memory variables you have, grandma! */
350 max_low_pfn = end_pfn;
352 high_memory = (void *)__va(end_pfn * PAGE_SIZE - 1) + 1;
354 /* Remove active ranges so rediscovery with NUMA-awareness happens */
355 remove_all_active_ranges();
357 #ifdef CONFIG_ACPI_NUMA
359 * Parse SRAT to discover nodes.
365 numa_initmem_init(0, end_pfn);
367 contig_initmem_init(0, end_pfn);
370 early_res_to_bootmem();
372 #ifdef CONFIG_ACPI_SLEEP
374 * Reserve low memory region for sleep support.
376 acpi_reserve_bootmem();
381 efi_reserve_bootmem();
385 * Find and reserve possible boot-time SMP configuration:
388 #ifdef CONFIG_BLK_DEV_INITRD
389 if (boot_params.hdr.type_of_loader && boot_params.hdr.ramdisk_image) {
390 unsigned long ramdisk_image = boot_params.hdr.ramdisk_image;
391 unsigned long ramdisk_size = boot_params.hdr.ramdisk_size;
392 unsigned long ramdisk_end = ramdisk_image + ramdisk_size;
393 unsigned long end_of_mem = end_pfn << PAGE_SHIFT;
395 if (ramdisk_end <= end_of_mem) {
396 reserve_bootmem_generic(ramdisk_image, ramdisk_size);
397 initrd_start = ramdisk_image + PAGE_OFFSET;
398 initrd_end = initrd_start+ramdisk_size;
400 /* Assumes everything on node 0 */
401 free_bootmem(ramdisk_image, ramdisk_size);
402 printk(KERN_ERR "initrd extends beyond end of memory "
403 "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
404 ramdisk_end, end_of_mem);
409 reserve_crashkernel();
416 * set this early, so we dont allocate cpu0
417 * if MADT list doesnt list BSP first
418 * mpparse.c/MP_processor_info() allocates logical cpu numbers.
420 cpu_set(0, cpu_present_map);
423 * Read APIC and some other early information from ACPI tables.
431 * get boot-time SMP configuration:
433 if (smp_found_config)
435 init_apic_mappings();
436 ioapic_init_mappings();
439 * We trust e820 completely. No explicit ROM probing in memory.
441 e820_reserve_resources(&code_resource, &data_resource, &bss_resource);
442 e820_mark_nosave_regions();
444 /* request I/O space for devices used on all i[345]86 PCs */
445 for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
446 request_resource(&ioport_resource, &standard_io_resources[i]);
451 #if defined(CONFIG_VGA_CONSOLE)
452 if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
453 conswitchp = &vga_con;
454 #elif defined(CONFIG_DUMMY_CONSOLE)
455 conswitchp = &dummy_con;
460 static int __cpuinit get_model_name(struct cpuinfo_x86 *c)
464 if (c->extended_cpuid_level < 0x80000004)
467 v = (unsigned int *) c->x86_model_id;
468 cpuid(0x80000002, &v[0], &v[1], &v[2], &v[3]);
469 cpuid(0x80000003, &v[4], &v[5], &v[6], &v[7]);
470 cpuid(0x80000004, &v[8], &v[9], &v[10], &v[11]);
471 c->x86_model_id[48] = 0;
476 static void __cpuinit display_cacheinfo(struct cpuinfo_x86 *c)
478 unsigned int n, dummy, eax, ebx, ecx, edx;
480 n = c->extended_cpuid_level;
482 if (n >= 0x80000005) {
483 cpuid(0x80000005, &dummy, &ebx, &ecx, &edx);
484 printk(KERN_INFO "CPU: L1 I Cache: %dK (%d bytes/line), "
485 "D cache %dK (%d bytes/line)\n",
486 edx>>24, edx&0xFF, ecx>>24, ecx&0xFF);
487 c->x86_cache_size = (ecx>>24) + (edx>>24);
488 /* On K8 L1 TLB is inclusive, so don't count it */
492 if (n >= 0x80000006) {
493 cpuid(0x80000006, &dummy, &ebx, &ecx, &edx);
494 ecx = cpuid_ecx(0x80000006);
495 c->x86_cache_size = ecx >> 16;
496 c->x86_tlbsize += ((ebx >> 16) & 0xfff) + (ebx & 0xfff);
498 printk(KERN_INFO "CPU: L2 Cache: %dK (%d bytes/line)\n",
499 c->x86_cache_size, ecx & 0xFF);
501 if (n >= 0x80000008) {
502 cpuid(0x80000008, &eax, &dummy, &dummy, &dummy);
503 c->x86_virt_bits = (eax >> 8) & 0xff;
504 c->x86_phys_bits = eax & 0xff;
509 static int nearby_node(int apicid)
513 for (i = apicid - 1; i >= 0; i--) {
514 node = apicid_to_node[i];
515 if (node != NUMA_NO_NODE && node_online(node))
518 for (i = apicid + 1; i < MAX_LOCAL_APIC; i++) {
519 node = apicid_to_node[i];
520 if (node != NUMA_NO_NODE && node_online(node))
523 return first_node(node_online_map); /* Shouldn't happen */
528 * On a AMD dual core setup the lower bits of the APIC id distingush the cores.
529 * Assumes number of cores is a power of two.
531 static void __init amd_detect_cmp(struct cpuinfo_x86 *c)
536 int cpu = smp_processor_id();
538 unsigned apicid = hard_smp_processor_id();
540 bits = c->x86_coreid_bits;
542 /* Low order bits define the core id (index of core in socket) */
543 c->cpu_core_id = c->phys_proc_id & ((1 << bits)-1);
544 /* Convert the APIC ID into the socket ID */
545 c->phys_proc_id = phys_pkg_id(bits);
548 node = c->phys_proc_id;
549 if (apicid_to_node[apicid] != NUMA_NO_NODE)
550 node = apicid_to_node[apicid];
551 if (!node_online(node)) {
552 /* Two possibilities here:
553 - The CPU is missing memory and no node was created.
554 In that case try picking one from a nearby CPU
555 - The APIC IDs differ from the HyperTransport node IDs
556 which the K8 northbridge parsing fills in.
557 Assume they are all increased by a constant offset,
558 but in the same order as the HT nodeids.
559 If that doesn't result in a usable node fall back to the
560 path for the previous case. */
562 int ht_nodeid = apicid - (cpu_data(0).phys_proc_id << bits);
564 if (ht_nodeid >= 0 &&
565 apicid_to_node[ht_nodeid] != NUMA_NO_NODE)
566 node = apicid_to_node[ht_nodeid];
567 /* Pick a nearby node */
568 if (!node_online(node))
569 node = nearby_node(apicid);
571 numa_set_node(cpu, node);
573 printk(KERN_INFO "CPU %d/%x -> Node %d\n", cpu, apicid, node);
578 static void __cpuinit early_init_amd_mc(struct cpuinfo_x86 *c)
583 /* Multi core CPU? */
584 if (c->extended_cpuid_level < 0x80000008)
587 ecx = cpuid_ecx(0x80000008);
589 c->x86_max_cores = (ecx & 0xff) + 1;
591 /* CPU telling us the core id bits shift? */
592 bits = (ecx >> 12) & 0xF;
594 /* Otherwise recompute */
596 while ((1 << bits) < c->x86_max_cores)
600 c->x86_coreid_bits = bits;
605 #define ENABLE_C1E_MASK 0x18000000
606 #define CPUID_PROCESSOR_SIGNATURE 1
607 #define CPUID_XFAM 0x0ff00000
608 #define CPUID_XFAM_K8 0x00000000
609 #define CPUID_XFAM_10H 0x00100000
610 #define CPUID_XFAM_11H 0x00200000
611 #define CPUID_XMOD 0x000f0000
612 #define CPUID_XMOD_REV_F 0x00040000
614 /* AMD systems with C1E don't have a working lAPIC timer. Check for that. */
615 static __cpuinit int amd_apic_timer_broken(void)
617 u32 lo, hi, eax = cpuid_eax(CPUID_PROCESSOR_SIGNATURE);
619 switch (eax & CPUID_XFAM) {
621 if ((eax & CPUID_XMOD) < CPUID_XMOD_REV_F)
625 rdmsr(MSR_K8_ENABLE_C1E, lo, hi);
626 if (lo & ENABLE_C1E_MASK)
630 /* err on the side of caution */
636 static void __cpuinit early_init_amd(struct cpuinfo_x86 *c)
638 early_init_amd_mc(c);
640 /* c->x86_power is 8000_0007 edx. Bit 8 is constant TSC */
641 if (c->x86_power & (1<<8))
642 set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
645 static void __cpuinit init_amd(struct cpuinfo_x86 *c)
653 * Disable TLB flush filter by setting HWCR.FFDIS on K8
654 * bit 6 of msr C001_0015
656 * Errata 63 for SH-B3 steppings
657 * Errata 122 for all steppings (F+ have it disabled by default)
660 rdmsrl(MSR_K8_HWCR, value);
662 wrmsrl(MSR_K8_HWCR, value);
666 /* Bit 31 in normal CPUID used for nonstandard 3DNow ID;
667 3DNow is IDd by bit 31 in extended CPUID (1*32+31) anyway */
668 clear_bit(0*32+31, (unsigned long *)&c->x86_capability);
670 /* On C+ stepping K8 rep microcode works well for copy/memset */
671 level = cpuid_eax(1);
672 if (c->x86 == 15 && ((level >= 0x0f48 && level < 0x0f50) ||
674 set_cpu_cap(c, X86_FEATURE_REP_GOOD);
675 if (c->x86 == 0x10 || c->x86 == 0x11)
676 set_cpu_cap(c, X86_FEATURE_REP_GOOD);
678 /* Enable workaround for FXSAVE leak */
680 set_cpu_cap(c, X86_FEATURE_FXSAVE_LEAK);
682 level = get_model_name(c);
686 /* Should distinguish Models here, but this is only
687 a fallback anyways. */
688 strcpy(c->x86_model_id, "Hammer");
692 display_cacheinfo(c);
694 /* Multi core CPU? */
695 if (c->extended_cpuid_level >= 0x80000008)
698 if (c->extended_cpuid_level >= 0x80000006 &&
699 (cpuid_edx(0x80000006) & 0xf000))
700 num_cache_leaves = 4;
702 num_cache_leaves = 3;
704 if (c->x86 == 0xf || c->x86 == 0x10 || c->x86 == 0x11)
705 set_cpu_cap(c, X86_FEATURE_K8);
707 /* MFENCE stops RDTSC speculation */
708 set_cpu_cap(c, X86_FEATURE_MFENCE_RDTSC);
710 if (amd_apic_timer_broken())
711 disable_apic_timer = 1;
714 void __cpuinit detect_ht(struct cpuinfo_x86 *c)
717 u32 eax, ebx, ecx, edx;
718 int index_msb, core_bits;
720 cpuid(1, &eax, &ebx, &ecx, &edx);
723 if (!cpu_has(c, X86_FEATURE_HT))
725 if (cpu_has(c, X86_FEATURE_CMP_LEGACY))
728 smp_num_siblings = (ebx & 0xff0000) >> 16;
730 if (smp_num_siblings == 1) {
731 printk(KERN_INFO "CPU: Hyper-Threading is disabled\n");
732 } else if (smp_num_siblings > 1) {
734 if (smp_num_siblings > NR_CPUS) {
735 printk(KERN_WARNING "CPU: Unsupported number of "
736 "siblings %d", smp_num_siblings);
737 smp_num_siblings = 1;
741 index_msb = get_count_order(smp_num_siblings);
742 c->phys_proc_id = phys_pkg_id(index_msb);
744 smp_num_siblings = smp_num_siblings / c->x86_max_cores;
746 index_msb = get_count_order(smp_num_siblings);
748 core_bits = get_count_order(c->x86_max_cores);
750 c->cpu_core_id = phys_pkg_id(index_msb) &
751 ((1 << core_bits) - 1);
754 if ((c->x86_max_cores * smp_num_siblings) > 1) {
755 printk(KERN_INFO "CPU: Physical Processor ID: %d\n",
757 printk(KERN_INFO "CPU: Processor Core ID: %d\n",
765 * find out the number of processor cores on the die
767 static int __cpuinit intel_num_cpu_cores(struct cpuinfo_x86 *c)
771 if (c->cpuid_level < 4)
774 cpuid_count(4, 0, &eax, &t, &t, &t);
777 return ((eax >> 26) + 1);
782 static void srat_detect_node(void)
786 int cpu = smp_processor_id();
787 int apicid = hard_smp_processor_id();
789 /* Don't do the funky fallback heuristics the AMD version employs
791 node = apicid_to_node[apicid];
792 if (node == NUMA_NO_NODE)
793 node = first_node(node_online_map);
794 numa_set_node(cpu, node);
796 printk(KERN_INFO "CPU %d/%x -> Node %d\n", cpu, apicid, node);
800 static void __cpuinit early_init_intel(struct cpuinfo_x86 *c)
802 if ((c->x86 == 0xf && c->x86_model >= 0x03) ||
803 (c->x86 == 0x6 && c->x86_model >= 0x0e))
804 set_bit(X86_FEATURE_CONSTANT_TSC, &c->x86_capability);
807 static void __cpuinit init_intel(struct cpuinfo_x86 *c)
812 init_intel_cacheinfo(c);
813 if (c->cpuid_level > 9) {
814 unsigned eax = cpuid_eax(10);
815 /* Check for version and the number of counters */
816 if ((eax & 0xff) && (((eax>>8) & 0xff) > 1))
817 set_cpu_cap(c, X86_FEATURE_ARCH_PERFMON);
822 rdmsr(MSR_IA32_MISC_ENABLE, l1, l2);
824 set_cpu_cap(c, X86_FEATURE_BTS);
826 set_cpu_cap(c, X86_FEATURE_PEBS);
833 n = c->extended_cpuid_level;
834 if (n >= 0x80000008) {
835 unsigned eax = cpuid_eax(0x80000008);
836 c->x86_virt_bits = (eax >> 8) & 0xff;
837 c->x86_phys_bits = eax & 0xff;
838 /* CPUID workaround for Intel 0F34 CPU */
839 if (c->x86_vendor == X86_VENDOR_INTEL &&
840 c->x86 == 0xF && c->x86_model == 0x3 &&
842 c->x86_phys_bits = 36;
846 c->x86_cache_alignment = c->x86_clflush_size * 2;
847 if ((c->x86 == 0xf && c->x86_model >= 0x03) ||
848 (c->x86 == 0x6 && c->x86_model >= 0x0e))
849 set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
851 set_cpu_cap(c, X86_FEATURE_REP_GOOD);
852 set_cpu_cap(c, X86_FEATURE_LFENCE_RDTSC);
853 c->x86_max_cores = intel_num_cpu_cores(c);
858 static void __cpuinit get_cpu_vendor(struct cpuinfo_x86 *c)
860 char *v = c->x86_vendor_id;
862 if (!strcmp(v, "AuthenticAMD"))
863 c->x86_vendor = X86_VENDOR_AMD;
864 else if (!strcmp(v, "GenuineIntel"))
865 c->x86_vendor = X86_VENDOR_INTEL;
867 c->x86_vendor = X86_VENDOR_UNKNOWN;
870 struct cpu_model_info {
873 char *model_names[16];
876 /* Do some early cpuid on the boot CPU to get some parameter that are
877 needed before check_bugs. Everything advanced is in identify_cpu
879 static void __cpuinit early_identify_cpu(struct cpuinfo_x86 *c)
883 c->loops_per_jiffy = loops_per_jiffy;
884 c->x86_cache_size = -1;
885 c->x86_vendor = X86_VENDOR_UNKNOWN;
886 c->x86_model = c->x86_mask = 0; /* So far unknown... */
887 c->x86_vendor_id[0] = '\0'; /* Unset */
888 c->x86_model_id[0] = '\0'; /* Unset */
889 c->x86_clflush_size = 64;
890 c->x86_cache_alignment = c->x86_clflush_size;
891 c->x86_max_cores = 1;
892 c->x86_coreid_bits = 0;
893 c->extended_cpuid_level = 0;
894 memset(&c->x86_capability, 0, sizeof c->x86_capability);
896 /* Get vendor name */
897 cpuid(0x00000000, (unsigned int *)&c->cpuid_level,
898 (unsigned int *)&c->x86_vendor_id[0],
899 (unsigned int *)&c->x86_vendor_id[8],
900 (unsigned int *)&c->x86_vendor_id[4]);
904 /* Initialize the standard set of capabilities */
905 /* Note that the vendor-specific code below might override */
907 /* Intel-defined flags: level 0x00000001 */
908 if (c->cpuid_level >= 0x00000001) {
910 cpuid(0x00000001, &tfms, &misc, &c->x86_capability[4],
911 &c->x86_capability[0]);
912 c->x86 = (tfms >> 8) & 0xf;
913 c->x86_model = (tfms >> 4) & 0xf;
914 c->x86_mask = tfms & 0xf;
916 c->x86 += (tfms >> 20) & 0xff;
918 c->x86_model += ((tfms >> 16) & 0xF) << 4;
919 if (c->x86_capability[0] & (1<<19))
920 c->x86_clflush_size = ((misc >> 8) & 0xff) * 8;
922 /* Have CPUID level 0 only - unheard of */
927 c->phys_proc_id = (cpuid_ebx(1) >> 24) & 0xff;
929 /* AMD-defined flags: level 0x80000001 */
930 xlvl = cpuid_eax(0x80000000);
931 c->extended_cpuid_level = xlvl;
932 if ((xlvl & 0xffff0000) == 0x80000000) {
933 if (xlvl >= 0x80000001) {
934 c->x86_capability[1] = cpuid_edx(0x80000001);
935 c->x86_capability[6] = cpuid_ecx(0x80000001);
937 if (xlvl >= 0x80000004)
938 get_model_name(c); /* Default name */
941 /* Transmeta-defined flags: level 0x80860001 */
942 xlvl = cpuid_eax(0x80860000);
943 if ((xlvl & 0xffff0000) == 0x80860000) {
944 /* Don't set x86_cpuid_level here for now to not confuse. */
945 if (xlvl >= 0x80860001)
946 c->x86_capability[2] = cpuid_edx(0x80860001);
949 c->extended_cpuid_level = cpuid_eax(0x80000000);
950 if (c->extended_cpuid_level >= 0x80000007)
951 c->x86_power = cpuid_edx(0x80000007);
953 switch (c->x86_vendor) {
957 case X86_VENDOR_INTEL:
965 * This does the hard work of actually picking apart the CPU stuff...
967 void __cpuinit identify_cpu(struct cpuinfo_x86 *c)
971 early_identify_cpu(c);
973 init_scattered_cpuid_features(c);
975 c->apicid = phys_pkg_id(0);
978 * Vendor-specific initialization. In this section we
979 * canonicalize the feature flags, meaning if there are
980 * features a certain CPU supports which CPUID doesn't
981 * tell us, CPUID claiming incorrect flags, or other bugs,
982 * we handle them here.
984 * At the end of this section, c->x86_capability better
985 * indicate the features this CPU genuinely supports!
987 switch (c->x86_vendor) {
992 case X86_VENDOR_INTEL:
996 case X86_VENDOR_UNKNOWN:
998 display_cacheinfo(c);
1005 * On SMP, boot_cpu_data holds the common feature set between
1006 * all CPUs; so make sure that we indicate which features are
1007 * common between the CPUs. The first time this routine gets
1008 * executed, c == &boot_cpu_data.
1010 if (c != &boot_cpu_data) {
1011 /* AND the already accumulated flags with these */
1012 for (i = 0; i < NCAPINTS; i++)
1013 boot_cpu_data.x86_capability[i] &= c->x86_capability[i];
1016 #ifdef CONFIG_X86_MCE
1019 select_idle_routine(c);
1021 if (c != &boot_cpu_data)
1024 numa_add_cpu(smp_processor_id());
1029 void __cpuinit print_cpu_info(struct cpuinfo_x86 *c)
1031 if (c->x86_model_id[0])
1032 printk(KERN_INFO "%s", c->x86_model_id);
1034 if (c->x86_mask || c->cpuid_level >= 0)
1035 printk(KERN_CONT " stepping %02x\n", c->x86_mask);
1037 printk(KERN_CONT "\n");
1041 * Get CPU information for use by the procfs.
1044 static int show_cpuinfo(struct seq_file *m, void *v)
1046 struct cpuinfo_x86 *c = v;
1050 * These flag bits must match the definitions in <asm/cpufeature.h>.
1051 * NULL means this bit is undefined or reserved; either way it doesn't
1052 * have meaning as far as Linux is concerned. Note that it's important
1053 * to realize there is a difference between this table and CPUID -- if
1054 * applications want to get the raw CPUID data, they should access
1055 * /dev/cpu/<cpu_nr>/cpuid instead.
1057 static const char *const x86_cap_flags[] = {
1059 "fpu", "vme", "de", "pse", "tsc", "msr", "pae", "mce",
1060 "cx8", "apic", NULL, "sep", "mtrr", "pge", "mca", "cmov",
1061 "pat", "pse36", "pn", "clflush", NULL, "dts", "acpi", "mmx",
1062 "fxsr", "sse", "sse2", "ss", "ht", "tm", "ia64", "pbe",
1065 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
1066 NULL, NULL, NULL, "syscall", NULL, NULL, NULL, NULL,
1067 NULL, NULL, NULL, NULL, "nx", NULL, "mmxext", NULL,
1068 NULL, "fxsr_opt", "pdpe1gb", "rdtscp", NULL, "lm",
1069 "3dnowext", "3dnow",
1071 /* Transmeta-defined */
1072 "recovery", "longrun", NULL, "lrti", NULL, NULL, NULL, NULL,
1073 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
1074 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
1075 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
1077 /* Other (Linux-defined) */
1078 "cxmmx", "k6_mtrr", "cyrix_arr", "centaur_mcr",
1079 NULL, NULL, NULL, NULL,
1080 "constant_tsc", "up", NULL, "arch_perfmon",
1081 "pebs", "bts", NULL, "sync_rdtsc",
1082 "rep_good", NULL, NULL, NULL, NULL, NULL, NULL, NULL,
1083 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
1085 /* Intel-defined (#2) */
1086 "pni", NULL, NULL, "monitor", "ds_cpl", "vmx", "smx", "est",
1087 "tm2", "ssse3", "cid", NULL, NULL, "cx16", "xtpr", NULL,
1088 NULL, NULL, "dca", "sse4_1", "sse4_2", NULL, NULL, "popcnt",
1089 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
1091 /* VIA/Cyrix/Centaur-defined */
1092 NULL, NULL, "rng", "rng_en", NULL, NULL, "ace", "ace_en",
1093 "ace2", "ace2_en", "phe", "phe_en", "pmm", "pmm_en", NULL, NULL,
1094 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
1095 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
1097 /* AMD-defined (#2) */
1098 "lahf_lm", "cmp_legacy", "svm", "extapic",
1099 "cr8_legacy", "abm", "sse4a", "misalignsse",
1100 "3dnowprefetch", "osvw", "ibs", "sse5",
1101 "skinit", "wdt", NULL, NULL,
1102 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
1103 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
1105 /* Auxiliary (Linux-defined) */
1106 "ida", NULL, NULL, NULL, NULL, NULL, NULL, NULL,
1107 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
1108 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
1109 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
1111 static const char *const x86_power_flags[] = {
1112 "ts", /* temperature sensor */
1113 "fid", /* frequency id control */
1114 "vid", /* voltage id control */
1115 "ttp", /* thermal trip */
1120 "", /* tsc invariant mapped to constant_tsc */
1129 seq_printf(m, "processor\t: %u\n"
1131 "cpu family\t: %d\n"
1133 "model name\t: %s\n",
1135 c->x86_vendor_id[0] ? c->x86_vendor_id : "unknown",
1138 c->x86_model_id[0] ? c->x86_model_id : "unknown");
1140 if (c->x86_mask || c->cpuid_level >= 0)
1141 seq_printf(m, "stepping\t: %d\n", c->x86_mask);
1143 seq_printf(m, "stepping\t: unknown\n");
1145 if (cpu_has(c, X86_FEATURE_TSC)) {
1146 unsigned int freq = cpufreq_quick_get((unsigned)cpu);
1150 seq_printf(m, "cpu MHz\t\t: %u.%03u\n",
1151 freq / 1000, (freq % 1000));
1155 if (c->x86_cache_size >= 0)
1156 seq_printf(m, "cache size\t: %d KB\n", c->x86_cache_size);
1159 if (smp_num_siblings * c->x86_max_cores > 1) {
1160 seq_printf(m, "physical id\t: %d\n", c->phys_proc_id);
1161 seq_printf(m, "siblings\t: %d\n",
1162 cpus_weight(per_cpu(cpu_core_map, cpu)));
1163 seq_printf(m, "core id\t\t: %d\n", c->cpu_core_id);
1164 seq_printf(m, "cpu cores\t: %d\n", c->booted_cores);
1170 "fpu_exception\t: yes\n"
1171 "cpuid level\t: %d\n"
1176 for (i = 0; i < 32*NCAPINTS; i++)
1177 if (cpu_has(c, i) && x86_cap_flags[i] != NULL)
1178 seq_printf(m, " %s", x86_cap_flags[i]);
1180 seq_printf(m, "\nbogomips\t: %lu.%02lu\n",
1181 c->loops_per_jiffy/(500000/HZ),
1182 (c->loops_per_jiffy/(5000/HZ)) % 100);
1184 if (c->x86_tlbsize > 0)
1185 seq_printf(m, "TLB size\t: %d 4K pages\n", c->x86_tlbsize);
1186 seq_printf(m, "clflush size\t: %d\n", c->x86_clflush_size);
1187 seq_printf(m, "cache_alignment\t: %d\n", c->x86_cache_alignment);
1189 seq_printf(m, "address sizes\t: %u bits physical, %u bits virtual\n",
1190 c->x86_phys_bits, c->x86_virt_bits);
1192 seq_printf(m, "power management:");
1193 for (i = 0; i < 32; i++) {
1194 if (c->x86_power & (1 << i)) {
1195 if (i < ARRAY_SIZE(x86_power_flags) &&
1197 seq_printf(m, "%s%s",
1198 x86_power_flags[i][0]?" ":"",
1199 x86_power_flags[i]);
1201 seq_printf(m, " [%d]", i);
1205 seq_printf(m, "\n\n");
1210 static void *c_start(struct seq_file *m, loff_t *pos)
1212 if (*pos == 0) /* just in case, cpu 0 is not the first */
1213 *pos = first_cpu(cpu_online_map);
1214 if ((*pos) < NR_CPUS && cpu_online(*pos))
1215 return &cpu_data(*pos);
1219 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
1221 *pos = next_cpu(*pos, cpu_online_map);
1222 return c_start(m, pos);
1225 static void c_stop(struct seq_file *m, void *v)
1229 struct seq_operations cpuinfo_op = {
1233 .show = show_cpuinfo,