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/screen_info.h>
19 #include <linux/ioport.h>
20 #include <linux/delay.h>
21 #include <linux/init.h>
22 #include <linux/initrd.h>
23 #include <linux/highmem.h>
24 #include <linux/bootmem.h>
25 #include <linux/module.h>
26 #include <asm/processor.h>
27 #include <linux/console.h>
28 #include <linux/seq_file.h>
29 #include <linux/crash_dump.h>
30 #include <linux/root_dev.h>
31 #include <linux/pci.h>
32 #include <asm/pci-direct.h>
33 #include <linux/efi.h>
34 #include <linux/acpi.h>
35 #include <linux/kallsyms.h>
36 #include <linux/edd.h>
37 #include <linux/iscsi_ibft.h>
38 #include <linux/mmzone.h>
39 #include <linux/kexec.h>
40 #include <linux/cpufreq.h>
41 #include <linux/dmi.h>
42 #include <linux/dma-mapping.h>
43 #include <linux/ctype.h>
44 #include <linux/sort.h>
45 #include <linux/uaccess.h>
46 #include <linux/init_ohci1394_dma.h>
47 #include <linux/kvm_para.h>
50 #include <asm/uaccess.h>
51 #include <asm/system.h>
52 #include <asm/vsyscall.h>
57 #include <video/edid.h>
61 #include <asm/mpspec.h>
62 #include <asm/mmu_context.h>
63 #include <asm/proto.h>
64 #include <asm/setup.h>
66 #include <asm/sections.h>
68 #include <asm/cacheflush.h>
71 #include <asm/topology.h>
72 #include <asm/trampoline.h>
74 #include <asm/mmconfig.h>
76 #include <mach_apic.h>
77 #ifdef CONFIG_PARAVIRT
78 #include <asm/paravirt.h>
87 struct cpuinfo_x86 boot_cpu_data __read_mostly;
88 EXPORT_SYMBOL(boot_cpu_data);
90 __u32 cleared_cpu_caps[NCAPINTS] __cpuinitdata;
92 unsigned long mmu_cr4_features;
94 /* Boot loader ID as an integer, for the benefit of proc_dointvec */
97 unsigned long saved_video_mode;
103 char dmi_alloc_data[DMI_MAX_DATA];
108 struct screen_info screen_info;
109 EXPORT_SYMBOL(screen_info);
110 struct sys_desc_table_struct {
111 unsigned short length;
112 unsigned char table[0];
115 struct edid_info edid_info;
116 EXPORT_SYMBOL_GPL(edid_info);
118 extern int root_mountflags;
120 char __initdata command_line[COMMAND_LINE_SIZE];
122 static struct resource standard_io_resources[] = {
123 { .name = "dma1", .start = 0x00, .end = 0x1f,
124 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
125 { .name = "pic1", .start = 0x20, .end = 0x21,
126 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
127 { .name = "timer0", .start = 0x40, .end = 0x43,
128 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
129 { .name = "timer1", .start = 0x50, .end = 0x53,
130 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
131 { .name = "keyboard", .start = 0x60, .end = 0x60,
132 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
133 { .name = "keyboard", .start = 0x64, .end = 0x64,
134 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
135 { .name = "dma page reg", .start = 0x80, .end = 0x8f,
136 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
137 { .name = "pic2", .start = 0xa0, .end = 0xa1,
138 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
139 { .name = "dma2", .start = 0xc0, .end = 0xdf,
140 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
141 { .name = "fpu", .start = 0xf0, .end = 0xff,
142 .flags = IORESOURCE_BUSY | IORESOURCE_IO }
145 #define IORESOURCE_RAM (IORESOURCE_BUSY | IORESOURCE_MEM)
147 static struct resource data_resource = {
148 .name = "Kernel data",
151 .flags = IORESOURCE_RAM,
153 static struct resource code_resource = {
154 .name = "Kernel code",
157 .flags = IORESOURCE_RAM,
159 static struct resource bss_resource = {
160 .name = "Kernel bss",
163 .flags = IORESOURCE_RAM,
166 static void __cpuinit early_identify_cpu(struct cpuinfo_x86 *c);
168 #ifdef CONFIG_PROC_VMCORE
169 /* elfcorehdr= specifies the location of elf core header
170 * stored by the crashed kernel. This option will be passed
171 * by kexec loader to the capture kernel.
173 static int __init setup_elfcorehdr(char *arg)
178 elfcorehdr_addr = memparse(arg, &end);
179 return end > arg ? 0 : -EINVAL;
181 early_param("elfcorehdr", setup_elfcorehdr);
186 contig_initmem_init(unsigned long start_pfn, unsigned long end_pfn)
188 unsigned long bootmap_size, bootmap;
190 bootmap_size = bootmem_bootmap_pages(end_pfn)<<PAGE_SHIFT;
191 bootmap = find_e820_area(0, end_pfn<<PAGE_SHIFT, bootmap_size,
194 panic("Cannot find bootmem map of size %ld\n", bootmap_size);
195 bootmap_size = init_bootmem(bootmap >> PAGE_SHIFT, end_pfn);
196 e820_register_active_regions(0, start_pfn, end_pfn);
197 free_bootmem_with_active_regions(0, end_pfn);
198 early_res_to_bootmem(0, end_pfn<<PAGE_SHIFT);
199 reserve_bootmem(bootmap, bootmap_size, BOOTMEM_DEFAULT);
203 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
205 #ifdef CONFIG_EDD_MODULE
209 * copy_edd() - Copy the BIOS EDD information
210 * from boot_params into a safe place.
213 static inline void copy_edd(void)
215 memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
216 sizeof(edd.mbr_signature));
217 memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
218 edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
219 edd.edd_info_nr = boot_params.eddbuf_entries;
222 static inline void copy_edd(void)
228 static void __init reserve_crashkernel(void)
230 unsigned long long total_mem;
231 unsigned long long crash_size, crash_base;
234 total_mem = ((unsigned long long)max_low_pfn - min_low_pfn) << PAGE_SHIFT;
236 ret = parse_crashkernel(boot_command_line, total_mem,
237 &crash_size, &crash_base);
238 if (ret == 0 && crash_size) {
239 if (crash_base <= 0) {
240 printk(KERN_INFO "crashkernel reservation failed - "
241 "you have to specify a base address\n");
245 if (reserve_bootmem(crash_base, crash_size,
246 BOOTMEM_EXCLUSIVE) < 0) {
247 printk(KERN_INFO "crashkernel reservation failed - "
248 "memory is in use\n");
252 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
253 "for crashkernel (System RAM: %ldMB)\n",
254 (unsigned long)(crash_size >> 20),
255 (unsigned long)(crash_base >> 20),
256 (unsigned long)(total_mem >> 20));
257 crashk_res.start = crash_base;
258 crashk_res.end = crash_base + crash_size - 1;
259 insert_resource(&iomem_resource, &crashk_res);
263 static inline void __init reserve_crashkernel(void)
267 /* Overridden in paravirt.c if CONFIG_PARAVIRT */
268 void __attribute__((weak)) __init memory_setup(void)
270 machine_specific_memory_setup();
273 static void __init parse_setup_data(void)
275 struct setup_data *data;
276 unsigned long pa_data;
278 if (boot_params.hdr.version < 0x0209)
280 pa_data = boot_params.hdr.setup_data;
282 data = early_ioremap(pa_data, PAGE_SIZE);
283 switch (data->type) {
287 #ifndef CONFIG_DEBUG_BOOT_PARAMS
288 free_early(pa_data, pa_data+sizeof(*data)+data->len);
290 pa_data = data->next;
291 early_iounmap(data, PAGE_SIZE);
296 * setup_arch - architecture-specific boot-time initializations
298 * Note: On x86_64, fixmaps are ready for use even before this is called.
300 void __init setup_arch(char **cmdline_p)
304 printk(KERN_INFO "Command line: %s\n", boot_command_line);
306 ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
307 screen_info = boot_params.screen_info;
308 edid_info = boot_params.edid_info;
309 saved_video_mode = boot_params.hdr.vid_mode;
310 bootloader_type = boot_params.hdr.type_of_loader;
312 #ifdef CONFIG_BLK_DEV_RAM
313 rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
314 rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
315 rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
318 if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
328 if (!boot_params.hdr.root_flags)
329 root_mountflags &= ~MS_RDONLY;
330 init_mm.start_code = (unsigned long) &_text;
331 init_mm.end_code = (unsigned long) &_etext;
332 init_mm.end_data = (unsigned long) &_edata;
333 init_mm.brk = (unsigned long) &_end;
335 code_resource.start = virt_to_phys(&_text);
336 code_resource.end = virt_to_phys(&_etext)-1;
337 data_resource.start = virt_to_phys(&_etext);
338 data_resource.end = virt_to_phys(&_edata)-1;
339 bss_resource.start = virt_to_phys(&__bss_start);
340 bss_resource.end = virt_to_phys(&__bss_stop)-1;
342 early_identify_cpu(&boot_cpu_data);
344 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
345 *cmdline_p = command_line;
351 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
352 if (init_ohci1394_dma_early)
353 init_ohci1394_dma_on_all_controllers();
356 finish_e820_parsing();
358 /* after parse_early_param, so could debug it */
359 insert_resource(&iomem_resource, &code_resource);
360 insert_resource(&iomem_resource, &data_resource);
361 insert_resource(&iomem_resource, &bss_resource);
363 early_gart_iommu_check();
365 e820_register_active_regions(0, 0, -1UL);
367 * partially used pages are not usable - thus
368 * we are rounding upwards:
370 end_pfn = e820_end_of_ram();
371 /* update e820 for memory not covered by WB MTRRs */
373 if (mtrr_trim_uncached_memory(end_pfn)) {
374 e820_register_active_regions(0, 0, -1UL);
375 end_pfn = e820_end_of_ram();
378 num_physpages = end_pfn;
382 max_pfn_mapped = init_memory_mapping(0, (max_pfn_mapped << PAGE_SHIFT));
392 #ifdef CONFIG_KVM_CLOCK
397 /* setup to use the early static init tables during kernel startup */
398 x86_cpu_to_apicid_early_ptr = (void *)x86_cpu_to_apicid_init;
399 x86_bios_cpu_apicid_early_ptr = (void *)x86_bios_cpu_apicid_init;
401 x86_cpu_to_node_map_early_ptr = (void *)x86_cpu_to_node_map_init;
407 * Initialize the ACPI boot-time table parser (gets the RSDP and SDT).
408 * Call this early for SRAT node setup.
410 acpi_boot_table_init();
413 /* How many end-of-memory variables you have, grandma! */
414 max_low_pfn = end_pfn;
416 high_memory = (void *)__va(end_pfn * PAGE_SIZE - 1) + 1;
418 /* Remove active ranges so rediscovery with NUMA-awareness happens */
419 remove_all_active_ranges();
421 #ifdef CONFIG_ACPI_NUMA
423 * Parse SRAT to discover nodes.
429 numa_initmem_init(0, end_pfn);
431 contig_initmem_init(0, end_pfn);
434 dma32_reserve_bootmem();
436 #ifdef CONFIG_ACPI_SLEEP
438 * Reserve low memory region for sleep support.
440 acpi_reserve_bootmem();
444 efi_reserve_bootmem();
447 * Find and reserve possible boot-time SMP configuration:
450 #ifdef CONFIG_BLK_DEV_INITRD
451 if (boot_params.hdr.type_of_loader && boot_params.hdr.ramdisk_image) {
452 unsigned long ramdisk_image = boot_params.hdr.ramdisk_image;
453 unsigned long ramdisk_size = boot_params.hdr.ramdisk_size;
454 unsigned long ramdisk_end = ramdisk_image + ramdisk_size;
455 unsigned long end_of_mem = end_pfn << PAGE_SHIFT;
457 if (ramdisk_end <= end_of_mem) {
459 * don't need to reserve again, already reserved early
460 * in x86_64_start_kernel, and early_res_to_bootmem
461 * convert that to reserved in bootmem
463 initrd_start = ramdisk_image + PAGE_OFFSET;
464 initrd_end = initrd_start+ramdisk_size;
466 free_bootmem(ramdisk_image, ramdisk_size);
467 printk(KERN_ERR "initrd extends beyond end of memory "
468 "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
469 ramdisk_end, end_of_mem);
474 reserve_crashkernel();
476 reserve_ibft_region();
485 * Read APIC and some other early information from ACPI tables.
493 * get boot-time SMP configuration:
495 if (smp_found_config)
497 init_apic_mappings();
498 ioapic_init_mappings();
503 * We trust e820 completely. No explicit ROM probing in memory.
505 e820_reserve_resources();
506 e820_mark_nosave_regions();
508 /* request I/O space for devices used on all i[345]86 PCs */
509 for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
510 request_resource(&ioport_resource, &standard_io_resources[i]);
515 #if defined(CONFIG_VGA_CONSOLE)
516 if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
517 conswitchp = &vga_con;
518 #elif defined(CONFIG_DUMMY_CONSOLE)
519 conswitchp = &dummy_con;
523 /* do this before identify_cpu for boot cpu */
524 check_enable_amd_mmconf_dmi();
527 int __cpuinit get_model_name(struct cpuinfo_x86 *c)
531 if (c->extended_cpuid_level < 0x80000004)
534 v = (unsigned int *) c->x86_model_id;
535 cpuid(0x80000002, &v[0], &v[1], &v[2], &v[3]);
536 cpuid(0x80000003, &v[4], &v[5], &v[6], &v[7]);
537 cpuid(0x80000004, &v[8], &v[9], &v[10], &v[11]);
538 c->x86_model_id[48] = 0;
543 void __cpuinit display_cacheinfo(struct cpuinfo_x86 *c)
545 unsigned int n, dummy, eax, ebx, ecx, edx;
547 n = c->extended_cpuid_level;
549 if (n >= 0x80000005) {
550 cpuid(0x80000005, &dummy, &ebx, &ecx, &edx);
551 printk(KERN_INFO "CPU: L1 I Cache: %dK (%d bytes/line), "
552 "D cache %dK (%d bytes/line)\n",
553 edx>>24, edx&0xFF, ecx>>24, ecx&0xFF);
554 c->x86_cache_size = (ecx>>24) + (edx>>24);
555 /* On K8 L1 TLB is inclusive, so don't count it */
559 if (n >= 0x80000006) {
560 cpuid(0x80000006, &dummy, &ebx, &ecx, &edx);
561 ecx = cpuid_ecx(0x80000006);
562 c->x86_cache_size = ecx >> 16;
563 c->x86_tlbsize += ((ebx >> 16) & 0xfff) + (ebx & 0xfff);
565 printk(KERN_INFO "CPU: L2 Cache: %dK (%d bytes/line)\n",
566 c->x86_cache_size, ecx & 0xFF);
568 if (n >= 0x80000008) {
569 cpuid(0x80000008, &eax, &dummy, &dummy, &dummy);
570 c->x86_virt_bits = (eax >> 8) & 0xff;
571 c->x86_phys_bits = eax & 0xff;
575 void __cpuinit detect_ht(struct cpuinfo_x86 *c)
578 u32 eax, ebx, ecx, edx;
579 int index_msb, core_bits;
581 cpuid(1, &eax, &ebx, &ecx, &edx);
584 if (!cpu_has(c, X86_FEATURE_HT))
586 if (cpu_has(c, X86_FEATURE_CMP_LEGACY))
589 smp_num_siblings = (ebx & 0xff0000) >> 16;
591 if (smp_num_siblings == 1) {
592 printk(KERN_INFO "CPU: Hyper-Threading is disabled\n");
593 } else if (smp_num_siblings > 1) {
595 if (smp_num_siblings > NR_CPUS) {
596 printk(KERN_WARNING "CPU: Unsupported number of "
597 "siblings %d", smp_num_siblings);
598 smp_num_siblings = 1;
602 index_msb = get_count_order(smp_num_siblings);
603 c->phys_proc_id = phys_pkg_id(index_msb);
605 smp_num_siblings = smp_num_siblings / c->x86_max_cores;
607 index_msb = get_count_order(smp_num_siblings);
609 core_bits = get_count_order(c->x86_max_cores);
611 c->cpu_core_id = phys_pkg_id(index_msb) &
612 ((1 << core_bits) - 1);
615 if ((c->x86_max_cores * smp_num_siblings) > 1) {
616 printk(KERN_INFO "CPU: Physical Processor ID: %d\n",
618 printk(KERN_INFO "CPU: Processor Core ID: %d\n",
625 static void __cpuinit get_cpu_vendor(struct cpuinfo_x86 *c)
627 char *v = c->x86_vendor_id;
629 if (!strcmp(v, "AuthenticAMD"))
630 c->x86_vendor = X86_VENDOR_AMD;
631 else if (!strcmp(v, "GenuineIntel"))
632 c->x86_vendor = X86_VENDOR_INTEL;
633 else if (!strcmp(v, "CentaurHauls"))
634 c->x86_vendor = X86_VENDOR_CENTAUR;
636 c->x86_vendor = X86_VENDOR_UNKNOWN;
639 // FIXME: Needs to use cpu_vendor_dev_register
640 extern void __cpuinit early_init_amd(struct cpuinfo_x86 *c);
641 extern void __cpuinit init_amd(struct cpuinfo_x86 *c);
642 extern void __cpuinit early_init_intel(struct cpuinfo_x86 *c);
643 extern void __cpuinit init_intel(struct cpuinfo_x86 *c);
644 extern void __cpuinit early_init_centaur(struct cpuinfo_x86 *c);
645 extern void __cpuinit init_centaur(struct cpuinfo_x86 *c);
647 /* Do some early cpuid on the boot CPU to get some parameter that are
648 needed before check_bugs. Everything advanced is in identify_cpu
650 static void __cpuinit early_identify_cpu(struct cpuinfo_x86 *c)
654 c->loops_per_jiffy = loops_per_jiffy;
655 c->x86_cache_size = -1;
656 c->x86_vendor = X86_VENDOR_UNKNOWN;
657 c->x86_model = c->x86_mask = 0; /* So far unknown... */
658 c->x86_vendor_id[0] = '\0'; /* Unset */
659 c->x86_model_id[0] = '\0'; /* Unset */
660 c->x86_clflush_size = 64;
661 c->x86_cache_alignment = c->x86_clflush_size;
662 c->x86_max_cores = 1;
663 c->x86_coreid_bits = 0;
664 c->extended_cpuid_level = 0;
665 memset(&c->x86_capability, 0, sizeof c->x86_capability);
667 /* Get vendor name */
668 cpuid(0x00000000, (unsigned int *)&c->cpuid_level,
669 (unsigned int *)&c->x86_vendor_id[0],
670 (unsigned int *)&c->x86_vendor_id[8],
671 (unsigned int *)&c->x86_vendor_id[4]);
675 /* Initialize the standard set of capabilities */
676 /* Note that the vendor-specific code below might override */
678 /* Intel-defined flags: level 0x00000001 */
679 if (c->cpuid_level >= 0x00000001) {
681 cpuid(0x00000001, &tfms, &misc, &c->x86_capability[4],
682 &c->x86_capability[0]);
683 c->x86 = (tfms >> 8) & 0xf;
684 c->x86_model = (tfms >> 4) & 0xf;
685 c->x86_mask = tfms & 0xf;
687 c->x86 += (tfms >> 20) & 0xff;
689 c->x86_model += ((tfms >> 16) & 0xF) << 4;
690 if (test_cpu_cap(c, X86_FEATURE_CLFLSH))
691 c->x86_clflush_size = ((misc >> 8) & 0xff) * 8;
693 /* Have CPUID level 0 only - unheard of */
697 c->initial_apicid = (cpuid_ebx(1) >> 24) & 0xff;
699 c->phys_proc_id = c->initial_apicid;
701 /* AMD-defined flags: level 0x80000001 */
702 xlvl = cpuid_eax(0x80000000);
703 c->extended_cpuid_level = xlvl;
704 if ((xlvl & 0xffff0000) == 0x80000000) {
705 if (xlvl >= 0x80000001) {
706 c->x86_capability[1] = cpuid_edx(0x80000001);
707 c->x86_capability[6] = cpuid_ecx(0x80000001);
709 if (xlvl >= 0x80000004)
710 get_model_name(c); /* Default name */
713 /* Transmeta-defined flags: level 0x80860001 */
714 xlvl = cpuid_eax(0x80860000);
715 if ((xlvl & 0xffff0000) == 0x80860000) {
716 /* Don't set x86_cpuid_level here for now to not confuse. */
717 if (xlvl >= 0x80860001)
718 c->x86_capability[2] = cpuid_edx(0x80860001);
721 c->extended_cpuid_level = cpuid_eax(0x80000000);
722 if (c->extended_cpuid_level >= 0x80000007)
723 c->x86_power = cpuid_edx(0x80000007);
725 switch (c->x86_vendor) {
729 case X86_VENDOR_INTEL:
732 case X86_VENDOR_CENTAUR:
733 early_init_centaur(c);
737 validate_pat_support(c);
741 * This does the hard work of actually picking apart the CPU stuff...
743 void __cpuinit identify_cpu(struct cpuinfo_x86 *c)
747 early_identify_cpu(c);
749 init_scattered_cpuid_features(c);
751 c->apicid = phys_pkg_id(0);
754 * Vendor-specific initialization. In this section we
755 * canonicalize the feature flags, meaning if there are
756 * features a certain CPU supports which CPUID doesn't
757 * tell us, CPUID claiming incorrect flags, or other bugs,
758 * we handle them here.
760 * At the end of this section, c->x86_capability better
761 * indicate the features this CPU genuinely supports!
763 switch (c->x86_vendor) {
768 case X86_VENDOR_INTEL:
772 case X86_VENDOR_CENTAUR:
776 case X86_VENDOR_UNKNOWN:
778 display_cacheinfo(c);
785 * On SMP, boot_cpu_data holds the common feature set between
786 * all CPUs; so make sure that we indicate which features are
787 * common between the CPUs. The first time this routine gets
788 * executed, c == &boot_cpu_data.
790 if (c != &boot_cpu_data) {
791 /* AND the already accumulated flags with these */
792 for (i = 0; i < NCAPINTS; i++)
793 boot_cpu_data.x86_capability[i] &= c->x86_capability[i];
796 /* Clear all flags overriden by options */
797 for (i = 0; i < NCAPINTS; i++)
798 c->x86_capability[i] &= ~cleared_cpu_caps[i];
800 #ifdef CONFIG_X86_MCE
803 select_idle_routine(c);
806 numa_add_cpu(smp_processor_id());
811 void __cpuinit identify_boot_cpu(void)
813 identify_cpu(&boot_cpu_data);
816 void __cpuinit identify_secondary_cpu(struct cpuinfo_x86 *c)
818 BUG_ON(c == &boot_cpu_data);
823 static __init int setup_noclflush(char *arg)
825 setup_clear_cpu_cap(X86_FEATURE_CLFLSH);
828 __setup("noclflush", setup_noclflush);
830 void __cpuinit print_cpu_info(struct cpuinfo_x86 *c)
832 if (c->x86_model_id[0])
833 printk(KERN_CONT "%s", c->x86_model_id);
835 if (c->x86_mask || c->cpuid_level >= 0)
836 printk(KERN_CONT " stepping %02x\n", c->x86_mask);
838 printk(KERN_CONT "\n");
841 static __init int setup_disablecpuid(char *arg)
844 if (get_option(&arg, &bit) && bit < NCAPINTS*32)
845 setup_clear_cpu_cap(bit);
850 __setup("clearcpuid=", setup_disablecpuid);