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>
44 #include <linux/init_ohci1394_dma.h>
47 #include <asm/uaccess.h>
48 #include <asm/system.h>
49 #include <asm/vsyscall.h>
54 #include <video/edid.h>
58 #include <asm/mpspec.h>
59 #include <asm/mmu_context.h>
60 #include <asm/proto.h>
61 #include <asm/setup.h>
62 #include <asm/mach_apic.h>
64 #include <asm/sections.h>
66 #include <asm/cacheflush.h>
69 #include <asm/topology.h>
71 #ifdef CONFIG_PARAVIRT
72 #include <asm/paravirt.h>
81 struct cpuinfo_x86 boot_cpu_data __read_mostly;
82 EXPORT_SYMBOL(boot_cpu_data);
84 __u32 cleared_cpu_caps[NCAPINTS] __cpuinitdata;
86 unsigned long mmu_cr4_features;
88 /* Boot loader ID as an integer, for the benefit of proc_dointvec */
91 unsigned long saved_video_mode;
93 int force_mwait __cpuinitdata;
99 char dmi_alloc_data[DMI_MAX_DATA];
104 struct screen_info screen_info;
105 EXPORT_SYMBOL(screen_info);
106 struct sys_desc_table_struct {
107 unsigned short length;
108 unsigned char table[0];
111 struct edid_info edid_info;
112 EXPORT_SYMBOL_GPL(edid_info);
114 extern int root_mountflags;
116 char __initdata command_line[COMMAND_LINE_SIZE];
118 struct resource standard_io_resources[] = {
119 { .name = "dma1", .start = 0x00, .end = 0x1f,
120 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
121 { .name = "pic1", .start = 0x20, .end = 0x21,
122 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
123 { .name = "timer0", .start = 0x40, .end = 0x43,
124 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
125 { .name = "timer1", .start = 0x50, .end = 0x53,
126 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
127 { .name = "keyboard", .start = 0x60, .end = 0x6f,
128 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
129 { .name = "dma page reg", .start = 0x80, .end = 0x8f,
130 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
131 { .name = "pic2", .start = 0xa0, .end = 0xa1,
132 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
133 { .name = "dma2", .start = 0xc0, .end = 0xdf,
134 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
135 { .name = "fpu", .start = 0xf0, .end = 0xff,
136 .flags = IORESOURCE_BUSY | IORESOURCE_IO }
139 #define IORESOURCE_RAM (IORESOURCE_BUSY | IORESOURCE_MEM)
141 static struct resource data_resource = {
142 .name = "Kernel data",
145 .flags = IORESOURCE_RAM,
147 static struct resource code_resource = {
148 .name = "Kernel code",
151 .flags = IORESOURCE_RAM,
153 static struct resource bss_resource = {
154 .name = "Kernel bss",
157 .flags = IORESOURCE_RAM,
160 static void __cpuinit early_identify_cpu(struct cpuinfo_x86 *c);
162 #ifdef CONFIG_PROC_VMCORE
163 /* elfcorehdr= specifies the location of elf core header
164 * stored by the crashed kernel. This option will be passed
165 * by kexec loader to the capture kernel.
167 static int __init setup_elfcorehdr(char *arg)
172 elfcorehdr_addr = memparse(arg, &end);
173 return end > arg ? 0 : -EINVAL;
175 early_param("elfcorehdr", setup_elfcorehdr);
180 contig_initmem_init(unsigned long start_pfn, unsigned long end_pfn)
182 unsigned long bootmap_size, bootmap;
184 bootmap_size = bootmem_bootmap_pages(end_pfn)<<PAGE_SHIFT;
185 bootmap = find_e820_area(0, end_pfn<<PAGE_SHIFT, bootmap_size,
188 panic("Cannot find bootmem map of size %ld\n", bootmap_size);
189 bootmap_size = init_bootmem(bootmap >> PAGE_SHIFT, end_pfn);
190 e820_register_active_regions(0, start_pfn, end_pfn);
191 free_bootmem_with_active_regions(0, end_pfn);
192 reserve_bootmem(bootmap, bootmap_size);
196 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
198 #ifdef CONFIG_EDD_MODULE
202 * copy_edd() - Copy the BIOS EDD information
203 * from boot_params into a safe place.
206 static inline void copy_edd(void)
208 memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
209 sizeof(edd.mbr_signature));
210 memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
211 edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
212 edd.edd_info_nr = boot_params.eddbuf_entries;
215 static inline void copy_edd(void)
221 static void __init reserve_crashkernel(void)
223 unsigned long long free_mem;
224 unsigned long long crash_size, crash_base;
228 ((unsigned long long)max_low_pfn - min_low_pfn) << PAGE_SHIFT;
230 ret = parse_crashkernel(boot_command_line, free_mem,
231 &crash_size, &crash_base);
232 if (ret == 0 && crash_size) {
233 if (crash_base > 0) {
234 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
235 "for crashkernel (System RAM: %ldMB)\n",
236 (unsigned long)(crash_size >> 20),
237 (unsigned long)(crash_base >> 20),
238 (unsigned long)(free_mem >> 20));
239 crashk_res.start = crash_base;
240 crashk_res.end = crash_base + crash_size - 1;
241 reserve_bootmem(crash_base, crash_size);
243 printk(KERN_INFO "crashkernel reservation failed - "
244 "you have to specify a base address\n");
248 static inline void __init reserve_crashkernel(void)
252 /* Overridden in paravirt.c if CONFIG_PARAVIRT */
253 void __attribute__((weak)) __init memory_setup(void)
255 machine_specific_memory_setup();
259 * setup_arch - architecture-specific boot-time initializations
261 * Note: On x86_64, fixmaps are ready for use even before this is called.
263 void __init setup_arch(char **cmdline_p)
267 printk(KERN_INFO "Command line: %s\n", boot_command_line);
269 ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
270 screen_info = boot_params.screen_info;
271 edid_info = boot_params.edid_info;
272 saved_video_mode = boot_params.hdr.vid_mode;
273 bootloader_type = boot_params.hdr.type_of_loader;
275 #ifdef CONFIG_BLK_DEV_RAM
276 rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
277 rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
278 rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
281 if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
291 if (!boot_params.hdr.root_flags)
292 root_mountflags &= ~MS_RDONLY;
293 init_mm.start_code = (unsigned long) &_text;
294 init_mm.end_code = (unsigned long) &_etext;
295 init_mm.end_data = (unsigned long) &_edata;
296 init_mm.brk = (unsigned long) &_end;
298 code_resource.start = virt_to_phys(&_text);
299 code_resource.end = virt_to_phys(&_etext)-1;
300 data_resource.start = virt_to_phys(&_etext);
301 data_resource.end = virt_to_phys(&_edata)-1;
302 bss_resource.start = virt_to_phys(&__bss_start);
303 bss_resource.end = virt_to_phys(&__bss_stop)-1;
305 early_identify_cpu(&boot_cpu_data);
307 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
308 *cmdline_p = command_line;
312 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
313 if (init_ohci1394_dma_early)
314 init_ohci1394_dma_on_all_controllers();
317 finish_e820_parsing();
319 early_gart_iommu_check();
321 e820_register_active_regions(0, 0, -1UL);
323 * partially used pages are not usable - thus
324 * we are rounding upwards:
326 end_pfn = e820_end_of_ram();
327 /* update e820 for memory not covered by WB MTRRs */
329 if (mtrr_trim_uncached_memory(end_pfn)) {
330 e820_register_active_regions(0, 0, -1UL);
331 end_pfn = e820_end_of_ram();
334 num_physpages = end_pfn;
338 init_memory_mapping(0, (end_pfn_map << PAGE_SHIFT));
347 /* setup to use the early static init tables during kernel startup */
348 x86_cpu_to_apicid_early_ptr = (void *)x86_cpu_to_apicid_init;
349 x86_bios_cpu_apicid_early_ptr = (void *)x86_bios_cpu_apicid_init;
351 x86_cpu_to_node_map_early_ptr = (void *)x86_cpu_to_node_map_init;
357 * Initialize the ACPI boot-time table parser (gets the RSDP and SDT).
358 * Call this early for SRAT node setup.
360 acpi_boot_table_init();
363 /* How many end-of-memory variables you have, grandma! */
364 max_low_pfn = end_pfn;
366 high_memory = (void *)__va(end_pfn * PAGE_SIZE - 1) + 1;
368 /* Remove active ranges so rediscovery with NUMA-awareness happens */
369 remove_all_active_ranges();
371 #ifdef CONFIG_ACPI_NUMA
373 * Parse SRAT to discover nodes.
379 numa_initmem_init(0, end_pfn);
381 contig_initmem_init(0, end_pfn);
384 early_res_to_bootmem();
386 #ifdef CONFIG_ACPI_SLEEP
388 * Reserve low memory region for sleep support.
390 acpi_reserve_bootmem();
394 efi_reserve_bootmem();
397 * Find and reserve possible boot-time SMP configuration:
400 #ifdef CONFIG_BLK_DEV_INITRD
401 if (boot_params.hdr.type_of_loader && boot_params.hdr.ramdisk_image) {
402 unsigned long ramdisk_image = boot_params.hdr.ramdisk_image;
403 unsigned long ramdisk_size = boot_params.hdr.ramdisk_size;
404 unsigned long ramdisk_end = ramdisk_image + ramdisk_size;
405 unsigned long end_of_mem = end_pfn << PAGE_SHIFT;
407 if (ramdisk_end <= end_of_mem) {
408 reserve_bootmem_generic(ramdisk_image, ramdisk_size);
409 initrd_start = ramdisk_image + PAGE_OFFSET;
410 initrd_end = initrd_start+ramdisk_size;
412 /* Assumes everything on node 0 */
413 free_bootmem(ramdisk_image, ramdisk_size);
414 printk(KERN_ERR "initrd extends beyond end of memory "
415 "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
416 ramdisk_end, end_of_mem);
421 reserve_crashkernel();
429 * Read APIC and some other early information from ACPI tables.
437 * get boot-time SMP configuration:
439 if (smp_found_config)
441 init_apic_mappings();
442 ioapic_init_mappings();
445 * We trust e820 completely. No explicit ROM probing in memory.
447 e820_reserve_resources(&code_resource, &data_resource, &bss_resource);
448 e820_mark_nosave_regions();
450 /* request I/O space for devices used on all i[345]86 PCs */
451 for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
452 request_resource(&ioport_resource, &standard_io_resources[i]);
457 #if defined(CONFIG_VGA_CONSOLE)
458 if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
459 conswitchp = &vga_con;
460 #elif defined(CONFIG_DUMMY_CONSOLE)
461 conswitchp = &dummy_con;
466 static int __cpuinit get_model_name(struct cpuinfo_x86 *c)
470 if (c->extended_cpuid_level < 0x80000004)
473 v = (unsigned int *) c->x86_model_id;
474 cpuid(0x80000002, &v[0], &v[1], &v[2], &v[3]);
475 cpuid(0x80000003, &v[4], &v[5], &v[6], &v[7]);
476 cpuid(0x80000004, &v[8], &v[9], &v[10], &v[11]);
477 c->x86_model_id[48] = 0;
482 static void __cpuinit display_cacheinfo(struct cpuinfo_x86 *c)
484 unsigned int n, dummy, eax, ebx, ecx, edx;
486 n = c->extended_cpuid_level;
488 if (n >= 0x80000005) {
489 cpuid(0x80000005, &dummy, &ebx, &ecx, &edx);
490 printk(KERN_INFO "CPU: L1 I Cache: %dK (%d bytes/line), "
491 "D cache %dK (%d bytes/line)\n",
492 edx>>24, edx&0xFF, ecx>>24, ecx&0xFF);
493 c->x86_cache_size = (ecx>>24) + (edx>>24);
494 /* On K8 L1 TLB is inclusive, so don't count it */
498 if (n >= 0x80000006) {
499 cpuid(0x80000006, &dummy, &ebx, &ecx, &edx);
500 ecx = cpuid_ecx(0x80000006);
501 c->x86_cache_size = ecx >> 16;
502 c->x86_tlbsize += ((ebx >> 16) & 0xfff) + (ebx & 0xfff);
504 printk(KERN_INFO "CPU: L2 Cache: %dK (%d bytes/line)\n",
505 c->x86_cache_size, ecx & 0xFF);
507 if (n >= 0x80000008) {
508 cpuid(0x80000008, &eax, &dummy, &dummy, &dummy);
509 c->x86_virt_bits = (eax >> 8) & 0xff;
510 c->x86_phys_bits = eax & 0xff;
515 static int nearby_node(int apicid)
519 for (i = apicid - 1; i >= 0; i--) {
520 node = apicid_to_node[i];
521 if (node != NUMA_NO_NODE && node_online(node))
524 for (i = apicid + 1; i < MAX_LOCAL_APIC; i++) {
525 node = apicid_to_node[i];
526 if (node != NUMA_NO_NODE && node_online(node))
529 return first_node(node_online_map); /* Shouldn't happen */
534 * On a AMD dual core setup the lower bits of the APIC id distingush the cores.
535 * Assumes number of cores is a power of two.
537 static void __cpuinit amd_detect_cmp(struct cpuinfo_x86 *c)
542 int cpu = smp_processor_id();
544 unsigned apicid = hard_smp_processor_id();
546 bits = c->x86_coreid_bits;
548 /* Low order bits define the core id (index of core in socket) */
549 c->cpu_core_id = c->phys_proc_id & ((1 << bits)-1);
550 /* Convert the APIC ID into the socket ID */
551 c->phys_proc_id = phys_pkg_id(bits);
554 node = c->phys_proc_id;
555 if (apicid_to_node[apicid] != NUMA_NO_NODE)
556 node = apicid_to_node[apicid];
557 if (!node_online(node)) {
558 /* Two possibilities here:
559 - The CPU is missing memory and no node was created.
560 In that case try picking one from a nearby CPU
561 - The APIC IDs differ from the HyperTransport node IDs
562 which the K8 northbridge parsing fills in.
563 Assume they are all increased by a constant offset,
564 but in the same order as the HT nodeids.
565 If that doesn't result in a usable node fall back to the
566 path for the previous case. */
568 int ht_nodeid = apicid - (cpu_data(0).phys_proc_id << bits);
570 if (ht_nodeid >= 0 &&
571 apicid_to_node[ht_nodeid] != NUMA_NO_NODE)
572 node = apicid_to_node[ht_nodeid];
573 /* Pick a nearby node */
574 if (!node_online(node))
575 node = nearby_node(apicid);
577 numa_set_node(cpu, node);
579 printk(KERN_INFO "CPU %d/%x -> Node %d\n", cpu, apicid, node);
584 static void __cpuinit early_init_amd_mc(struct cpuinfo_x86 *c)
589 /* Multi core CPU? */
590 if (c->extended_cpuid_level < 0x80000008)
593 ecx = cpuid_ecx(0x80000008);
595 c->x86_max_cores = (ecx & 0xff) + 1;
597 /* CPU telling us the core id bits shift? */
598 bits = (ecx >> 12) & 0xF;
600 /* Otherwise recompute */
602 while ((1 << bits) < c->x86_max_cores)
606 c->x86_coreid_bits = bits;
611 #define ENABLE_C1E_MASK 0x18000000
612 #define CPUID_PROCESSOR_SIGNATURE 1
613 #define CPUID_XFAM 0x0ff00000
614 #define CPUID_XFAM_K8 0x00000000
615 #define CPUID_XFAM_10H 0x00100000
616 #define CPUID_XFAM_11H 0x00200000
617 #define CPUID_XMOD 0x000f0000
618 #define CPUID_XMOD_REV_F 0x00040000
620 /* AMD systems with C1E don't have a working lAPIC timer. Check for that. */
621 static __cpuinit int amd_apic_timer_broken(void)
623 u32 lo, hi, eax = cpuid_eax(CPUID_PROCESSOR_SIGNATURE);
625 switch (eax & CPUID_XFAM) {
627 if ((eax & CPUID_XMOD) < CPUID_XMOD_REV_F)
631 rdmsr(MSR_K8_ENABLE_C1E, lo, hi);
632 if (lo & ENABLE_C1E_MASK)
636 /* err on the side of caution */
642 static void __cpuinit early_init_amd(struct cpuinfo_x86 *c)
644 early_init_amd_mc(c);
646 /* c->x86_power is 8000_0007 edx. Bit 8 is constant TSC */
647 if (c->x86_power & (1<<8))
648 set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
651 static void __cpuinit init_amd(struct cpuinfo_x86 *c)
659 * Disable TLB flush filter by setting HWCR.FFDIS on K8
660 * bit 6 of msr C001_0015
662 * Errata 63 for SH-B3 steppings
663 * Errata 122 for all steppings (F+ have it disabled by default)
666 rdmsrl(MSR_K8_HWCR, value);
668 wrmsrl(MSR_K8_HWCR, value);
672 /* Bit 31 in normal CPUID used for nonstandard 3DNow ID;
673 3DNow is IDd by bit 31 in extended CPUID (1*32+31) anyway */
674 clear_bit(0*32+31, (unsigned long *)&c->x86_capability);
676 /* On C+ stepping K8 rep microcode works well for copy/memset */
677 level = cpuid_eax(1);
678 if (c->x86 == 15 && ((level >= 0x0f48 && level < 0x0f50) ||
680 set_cpu_cap(c, X86_FEATURE_REP_GOOD);
681 if (c->x86 == 0x10 || c->x86 == 0x11)
682 set_cpu_cap(c, X86_FEATURE_REP_GOOD);
684 /* Enable workaround for FXSAVE leak */
686 set_cpu_cap(c, X86_FEATURE_FXSAVE_LEAK);
688 level = get_model_name(c);
692 /* Should distinguish Models here, but this is only
693 a fallback anyways. */
694 strcpy(c->x86_model_id, "Hammer");
698 display_cacheinfo(c);
700 /* Multi core CPU? */
701 if (c->extended_cpuid_level >= 0x80000008)
704 if (c->extended_cpuid_level >= 0x80000006 &&
705 (cpuid_edx(0x80000006) & 0xf000))
706 num_cache_leaves = 4;
708 num_cache_leaves = 3;
710 if (c->x86 == 0xf || c->x86 == 0x10 || c->x86 == 0x11)
711 set_cpu_cap(c, X86_FEATURE_K8);
713 /* MFENCE stops RDTSC speculation */
714 set_cpu_cap(c, X86_FEATURE_MFENCE_RDTSC);
716 if (amd_apic_timer_broken())
717 disable_apic_timer = 1;
720 void __cpuinit detect_ht(struct cpuinfo_x86 *c)
723 u32 eax, ebx, ecx, edx;
724 int index_msb, core_bits;
726 cpuid(1, &eax, &ebx, &ecx, &edx);
729 if (!cpu_has(c, X86_FEATURE_HT))
731 if (cpu_has(c, X86_FEATURE_CMP_LEGACY))
734 smp_num_siblings = (ebx & 0xff0000) >> 16;
736 if (smp_num_siblings == 1) {
737 printk(KERN_INFO "CPU: Hyper-Threading is disabled\n");
738 } else if (smp_num_siblings > 1) {
740 if (smp_num_siblings > NR_CPUS) {
741 printk(KERN_WARNING "CPU: Unsupported number of "
742 "siblings %d", smp_num_siblings);
743 smp_num_siblings = 1;
747 index_msb = get_count_order(smp_num_siblings);
748 c->phys_proc_id = phys_pkg_id(index_msb);
750 smp_num_siblings = smp_num_siblings / c->x86_max_cores;
752 index_msb = get_count_order(smp_num_siblings);
754 core_bits = get_count_order(c->x86_max_cores);
756 c->cpu_core_id = phys_pkg_id(index_msb) &
757 ((1 << core_bits) - 1);
760 if ((c->x86_max_cores * smp_num_siblings) > 1) {
761 printk(KERN_INFO "CPU: Physical Processor ID: %d\n",
763 printk(KERN_INFO "CPU: Processor Core ID: %d\n",
771 * find out the number of processor cores on the die
773 static int __cpuinit intel_num_cpu_cores(struct cpuinfo_x86 *c)
777 if (c->cpuid_level < 4)
780 cpuid_count(4, 0, &eax, &t, &t, &t);
783 return ((eax >> 26) + 1);
788 static void srat_detect_node(void)
792 int cpu = smp_processor_id();
793 int apicid = hard_smp_processor_id();
795 /* Don't do the funky fallback heuristics the AMD version employs
797 node = apicid_to_node[apicid];
798 if (node == NUMA_NO_NODE)
799 node = first_node(node_online_map);
800 numa_set_node(cpu, node);
802 printk(KERN_INFO "CPU %d/%x -> Node %d\n", cpu, apicid, node);
806 static void __cpuinit early_init_intel(struct cpuinfo_x86 *c)
808 if ((c->x86 == 0xf && c->x86_model >= 0x03) ||
809 (c->x86 == 0x6 && c->x86_model >= 0x0e))
810 set_bit(X86_FEATURE_CONSTANT_TSC, &c->x86_capability);
813 static void __cpuinit init_intel(struct cpuinfo_x86 *c)
818 init_intel_cacheinfo(c);
819 if (c->cpuid_level > 9) {
820 unsigned eax = cpuid_eax(10);
821 /* Check for version and the number of counters */
822 if ((eax & 0xff) && (((eax>>8) & 0xff) > 1))
823 set_cpu_cap(c, X86_FEATURE_ARCH_PERFMON);
828 rdmsr(MSR_IA32_MISC_ENABLE, l1, l2);
830 set_cpu_cap(c, X86_FEATURE_BTS);
832 set_cpu_cap(c, X86_FEATURE_PEBS);
839 n = c->extended_cpuid_level;
840 if (n >= 0x80000008) {
841 unsigned eax = cpuid_eax(0x80000008);
842 c->x86_virt_bits = (eax >> 8) & 0xff;
843 c->x86_phys_bits = eax & 0xff;
844 /* CPUID workaround for Intel 0F34 CPU */
845 if (c->x86_vendor == X86_VENDOR_INTEL &&
846 c->x86 == 0xF && c->x86_model == 0x3 &&
848 c->x86_phys_bits = 36;
852 c->x86_cache_alignment = c->x86_clflush_size * 2;
853 if ((c->x86 == 0xf && c->x86_model >= 0x03) ||
854 (c->x86 == 0x6 && c->x86_model >= 0x0e))
855 set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
857 set_cpu_cap(c, X86_FEATURE_REP_GOOD);
858 set_cpu_cap(c, X86_FEATURE_LFENCE_RDTSC);
859 c->x86_max_cores = intel_num_cpu_cores(c);
864 static void __cpuinit get_cpu_vendor(struct cpuinfo_x86 *c)
866 char *v = c->x86_vendor_id;
868 if (!strcmp(v, "AuthenticAMD"))
869 c->x86_vendor = X86_VENDOR_AMD;
870 else if (!strcmp(v, "GenuineIntel"))
871 c->x86_vendor = X86_VENDOR_INTEL;
873 c->x86_vendor = X86_VENDOR_UNKNOWN;
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 /* Clear all flags overriden by options */
1017 for (i = 0; i < NCAPINTS; i++)
1018 c->x86_capability[i] ^= cleared_cpu_caps[i];
1020 #ifdef CONFIG_X86_MCE
1023 select_idle_routine(c);
1025 if (c != &boot_cpu_data)
1028 numa_add_cpu(smp_processor_id());
1033 static __init int setup_noclflush(char *arg)
1035 setup_clear_cpu_cap(X86_FEATURE_CLFLSH);
1038 __setup("noclflush", setup_noclflush);
1040 void __cpuinit print_cpu_info(struct cpuinfo_x86 *c)
1042 if (c->x86_model_id[0])
1043 printk(KERN_INFO "%s", c->x86_model_id);
1045 if (c->x86_mask || c->cpuid_level >= 0)
1046 printk(KERN_CONT " stepping %02x\n", c->x86_mask);
1048 printk(KERN_CONT "\n");
1051 static __init int setup_disablecpuid(char *arg)
1054 if (get_option(&arg, &bit) && bit < NCAPINTS*32)
1055 setup_clear_cpu_cap(bit);
1060 __setup("clearcpuid=", setup_disablecpuid);
1063 * Get CPU information for use by the procfs.
1066 static int show_cpuinfo(struct seq_file *m, void *v)
1068 struct cpuinfo_x86 *c = v;
1075 seq_printf(m, "processor\t: %u\n"
1077 "cpu family\t: %d\n"
1079 "model name\t: %s\n",
1081 c->x86_vendor_id[0] ? c->x86_vendor_id : "unknown",
1084 c->x86_model_id[0] ? c->x86_model_id : "unknown");
1086 if (c->x86_mask || c->cpuid_level >= 0)
1087 seq_printf(m, "stepping\t: %d\n", c->x86_mask);
1089 seq_printf(m, "stepping\t: unknown\n");
1091 if (cpu_has(c, X86_FEATURE_TSC)) {
1092 unsigned int freq = cpufreq_quick_get((unsigned)cpu);
1096 seq_printf(m, "cpu MHz\t\t: %u.%03u\n",
1097 freq / 1000, (freq % 1000));
1101 if (c->x86_cache_size >= 0)
1102 seq_printf(m, "cache size\t: %d KB\n", c->x86_cache_size);
1105 if (smp_num_siblings * c->x86_max_cores > 1) {
1106 seq_printf(m, "physical id\t: %d\n", c->phys_proc_id);
1107 seq_printf(m, "siblings\t: %d\n",
1108 cpus_weight(per_cpu(cpu_core_map, cpu)));
1109 seq_printf(m, "core id\t\t: %d\n", c->cpu_core_id);
1110 seq_printf(m, "cpu cores\t: %d\n", c->booted_cores);
1116 "fpu_exception\t: yes\n"
1117 "cpuid level\t: %d\n"
1122 for (i = 0; i < 32*NCAPINTS; i++)
1123 if (cpu_has(c, i) && x86_cap_flags[i] != NULL)
1124 seq_printf(m, " %s", x86_cap_flags[i]);
1126 seq_printf(m, "\nbogomips\t: %lu.%02lu\n",
1127 c->loops_per_jiffy/(500000/HZ),
1128 (c->loops_per_jiffy/(5000/HZ)) % 100);
1130 if (c->x86_tlbsize > 0)
1131 seq_printf(m, "TLB size\t: %d 4K pages\n", c->x86_tlbsize);
1132 seq_printf(m, "clflush size\t: %d\n", c->x86_clflush_size);
1133 seq_printf(m, "cache_alignment\t: %d\n", c->x86_cache_alignment);
1135 seq_printf(m, "address sizes\t: %u bits physical, %u bits virtual\n",
1136 c->x86_phys_bits, c->x86_virt_bits);
1138 seq_printf(m, "power management:");
1139 for (i = 0; i < 32; i++) {
1140 if (c->x86_power & (1 << i)) {
1141 if (i < ARRAY_SIZE(x86_power_flags) &&
1143 seq_printf(m, "%s%s",
1144 x86_power_flags[i][0]?" ":"",
1145 x86_power_flags[i]);
1147 seq_printf(m, " [%d]", i);
1151 seq_printf(m, "\n\n");
1156 static void *c_start(struct seq_file *m, loff_t *pos)
1158 if (*pos == 0) /* just in case, cpu 0 is not the first */
1159 *pos = first_cpu(cpu_online_map);
1160 if ((*pos) < NR_CPUS && cpu_online(*pos))
1161 return &cpu_data(*pos);
1165 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
1167 *pos = next_cpu(*pos, cpu_online_map);
1168 return c_start(m, pos);
1171 static void c_stop(struct seq_file *m, void *v)
1175 const struct seq_operations cpuinfo_op = {
1179 .show = show_cpuinfo,