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 <linux/efi.h>
33 #include <linux/acpi.h>
34 #include <linux/kallsyms.h>
35 #include <linux/edd.h>
36 #include <linux/mmzone.h>
37 #include <linux/kexec.h>
38 #include <linux/cpufreq.h>
39 #include <linux/dmi.h>
40 #include <linux/dma-mapping.h>
41 #include <linux/ctype.h>
42 #include <linux/uaccess.h>
43 #include <linux/init_ohci1394_dma.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>
62 #include <asm/sections.h>
64 #include <asm/cacheflush.h>
67 #include <asm/topology.h>
69 #include <mach_apic.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 __u32 cleared_cpu_caps[NCAPINTS] __cpuinitdata;
85 unsigned long mmu_cr4_features;
87 /* Boot loader ID as an integer, for the benefit of proc_dointvec */
90 unsigned long saved_video_mode;
92 int force_mwait __cpuinitdata;
98 char dmi_alloc_data[DMI_MAX_DATA];
103 struct screen_info screen_info;
104 EXPORT_SYMBOL(screen_info);
105 struct sys_desc_table_struct {
106 unsigned short length;
107 unsigned char table[0];
110 struct edid_info edid_info;
111 EXPORT_SYMBOL_GPL(edid_info);
113 extern int root_mountflags;
115 char __initdata command_line[COMMAND_LINE_SIZE];
117 struct resource standard_io_resources[] = {
118 { .name = "dma1", .start = 0x00, .end = 0x1f,
119 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
120 { .name = "pic1", .start = 0x20, .end = 0x21,
121 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
122 { .name = "timer0", .start = 0x40, .end = 0x43,
123 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
124 { .name = "timer1", .start = 0x50, .end = 0x53,
125 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
126 { .name = "keyboard", .start = 0x60, .end = 0x6f,
127 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
128 { .name = "dma page reg", .start = 0x80, .end = 0x8f,
129 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
130 { .name = "pic2", .start = 0xa0, .end = 0xa1,
131 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
132 { .name = "dma2", .start = 0xc0, .end = 0xdf,
133 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
134 { .name = "fpu", .start = 0xf0, .end = 0xff,
135 .flags = IORESOURCE_BUSY | IORESOURCE_IO }
138 #define IORESOURCE_RAM (IORESOURCE_BUSY | IORESOURCE_MEM)
140 static struct resource data_resource = {
141 .name = "Kernel data",
144 .flags = IORESOURCE_RAM,
146 static struct resource code_resource = {
147 .name = "Kernel code",
150 .flags = IORESOURCE_RAM,
152 static struct resource bss_resource = {
153 .name = "Kernel bss",
156 .flags = IORESOURCE_RAM,
159 static void __cpuinit early_identify_cpu(struct cpuinfo_x86 *c);
161 #ifdef CONFIG_PROC_VMCORE
162 /* elfcorehdr= specifies the location of elf core header
163 * stored by the crashed kernel. This option will be passed
164 * by kexec loader to the capture kernel.
166 static int __init setup_elfcorehdr(char *arg)
171 elfcorehdr_addr = memparse(arg, &end);
172 return end > arg ? 0 : -EINVAL;
174 early_param("elfcorehdr", setup_elfcorehdr);
179 contig_initmem_init(unsigned long start_pfn, unsigned long end_pfn)
181 unsigned long bootmap_size, bootmap;
183 bootmap_size = bootmem_bootmap_pages(end_pfn)<<PAGE_SHIFT;
184 bootmap = find_e820_area(0, end_pfn<<PAGE_SHIFT, bootmap_size,
187 panic("Cannot find bootmem map of size %ld\n", bootmap_size);
188 bootmap_size = init_bootmem(bootmap >> PAGE_SHIFT, end_pfn);
189 e820_register_active_regions(0, start_pfn, end_pfn);
190 free_bootmem_with_active_regions(0, end_pfn);
191 reserve_bootmem(bootmap, bootmap_size, BOOTMEM_DEFAULT);
195 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
197 #ifdef CONFIG_EDD_MODULE
201 * copy_edd() - Copy the BIOS EDD information
202 * from boot_params into a safe place.
205 static inline void copy_edd(void)
207 memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
208 sizeof(edd.mbr_signature));
209 memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
210 edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
211 edd.edd_info_nr = boot_params.eddbuf_entries;
214 static inline void copy_edd(void)
220 static void __init reserve_crashkernel(void)
222 unsigned long long total_mem;
223 unsigned long long crash_size, crash_base;
226 total_mem = ((unsigned long long)max_low_pfn - min_low_pfn) << PAGE_SHIFT;
228 ret = parse_crashkernel(boot_command_line, total_mem,
229 &crash_size, &crash_base);
230 if (ret == 0 && crash_size) {
231 if (crash_base <= 0) {
232 printk(KERN_INFO "crashkernel reservation failed - "
233 "you have to specify a base address\n");
237 if (reserve_bootmem(crash_base, crash_size,
238 BOOTMEM_EXCLUSIVE) < 0) {
239 printk(KERN_INFO "crashkernel reservation failed - "
240 "memory is in use\n");
244 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
245 "for crashkernel (System RAM: %ldMB)\n",
246 (unsigned long)(crash_size >> 20),
247 (unsigned long)(crash_base >> 20),
248 (unsigned long)(total_mem >> 20));
249 crashk_res.start = crash_base;
250 crashk_res.end = crash_base + crash_size - 1;
251 insert_resource(&iomem_resource, &crashk_res);
255 static inline void __init reserve_crashkernel(void)
259 /* Overridden in paravirt.c if CONFIG_PARAVIRT */
260 void __attribute__((weak)) __init memory_setup(void)
262 machine_specific_memory_setup();
266 * setup_arch - architecture-specific boot-time initializations
268 * Note: On x86_64, fixmaps are ready for use even before this is called.
270 void __init setup_arch(char **cmdline_p)
274 printk(KERN_INFO "Command line: %s\n", boot_command_line);
276 ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
277 screen_info = boot_params.screen_info;
278 edid_info = boot_params.edid_info;
279 saved_video_mode = boot_params.hdr.vid_mode;
280 bootloader_type = boot_params.hdr.type_of_loader;
282 #ifdef CONFIG_BLK_DEV_RAM
283 rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
284 rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
285 rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
288 if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
298 if (!boot_params.hdr.root_flags)
299 root_mountflags &= ~MS_RDONLY;
300 init_mm.start_code = (unsigned long) &_text;
301 init_mm.end_code = (unsigned long) &_etext;
302 init_mm.end_data = (unsigned long) &_edata;
303 init_mm.brk = (unsigned long) &_end;
305 code_resource.start = virt_to_phys(&_text);
306 code_resource.end = virt_to_phys(&_etext)-1;
307 data_resource.start = virt_to_phys(&_etext);
308 data_resource.end = virt_to_phys(&_edata)-1;
309 bss_resource.start = virt_to_phys(&__bss_start);
310 bss_resource.end = virt_to_phys(&__bss_stop)-1;
312 early_identify_cpu(&boot_cpu_data);
314 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
315 *cmdline_p = command_line;
319 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
320 if (init_ohci1394_dma_early)
321 init_ohci1394_dma_on_all_controllers();
324 finish_e820_parsing();
326 /* after parse_early_param, so could debug it */
327 insert_resource(&iomem_resource, &code_resource);
328 insert_resource(&iomem_resource, &data_resource);
329 insert_resource(&iomem_resource, &bss_resource);
331 early_gart_iommu_check();
333 e820_register_active_regions(0, 0, -1UL);
335 * partially used pages are not usable - thus
336 * we are rounding upwards:
338 end_pfn = e820_end_of_ram();
339 /* update e820 for memory not covered by WB MTRRs */
341 if (mtrr_trim_uncached_memory(end_pfn)) {
342 e820_register_active_regions(0, 0, -1UL);
343 end_pfn = e820_end_of_ram();
346 num_physpages = end_pfn;
350 max_pfn_mapped = init_memory_mapping(0, (max_pfn_mapped << PAGE_SHIFT));
361 /* setup to use the early static init tables during kernel startup */
362 x86_cpu_to_apicid_early_ptr = (void *)x86_cpu_to_apicid_init;
363 x86_bios_cpu_apicid_early_ptr = (void *)x86_bios_cpu_apicid_init;
365 x86_cpu_to_node_map_early_ptr = (void *)x86_cpu_to_node_map_init;
371 * Initialize the ACPI boot-time table parser (gets the RSDP and SDT).
372 * Call this early for SRAT node setup.
374 acpi_boot_table_init();
377 /* How many end-of-memory variables you have, grandma! */
378 max_low_pfn = end_pfn;
380 high_memory = (void *)__va(end_pfn * PAGE_SIZE - 1) + 1;
382 /* Remove active ranges so rediscovery with NUMA-awareness happens */
383 remove_all_active_ranges();
385 #ifdef CONFIG_ACPI_NUMA
387 * Parse SRAT to discover nodes.
393 numa_initmem_init(0, end_pfn);
395 contig_initmem_init(0, end_pfn);
398 early_res_to_bootmem();
400 #ifdef CONFIG_ACPI_SLEEP
402 * Reserve low memory region for sleep support.
404 acpi_reserve_bootmem();
408 efi_reserve_bootmem();
411 * Find and reserve possible boot-time SMP configuration:
414 #ifdef CONFIG_BLK_DEV_INITRD
415 if (boot_params.hdr.type_of_loader && boot_params.hdr.ramdisk_image) {
416 unsigned long ramdisk_image = boot_params.hdr.ramdisk_image;
417 unsigned long ramdisk_size = boot_params.hdr.ramdisk_size;
418 unsigned long ramdisk_end = ramdisk_image + ramdisk_size;
419 unsigned long end_of_mem = end_pfn << PAGE_SHIFT;
421 if (ramdisk_end <= end_of_mem) {
422 reserve_bootmem_generic(ramdisk_image, ramdisk_size);
423 initrd_start = ramdisk_image + PAGE_OFFSET;
424 initrd_end = initrd_start+ramdisk_size;
426 /* Assumes everything on node 0 */
427 free_bootmem(ramdisk_image, ramdisk_size);
428 printk(KERN_ERR "initrd extends beyond end of memory "
429 "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
430 ramdisk_end, end_of_mem);
435 reserve_crashkernel();
443 * Read APIC and some other early information from ACPI tables.
451 * get boot-time SMP configuration:
453 if (smp_found_config)
455 init_apic_mappings();
456 ioapic_init_mappings();
459 * We trust e820 completely. No explicit ROM probing in memory.
461 e820_reserve_resources();
462 e820_mark_nosave_regions();
464 /* request I/O space for devices used on all i[345]86 PCs */
465 for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
466 request_resource(&ioport_resource, &standard_io_resources[i]);
471 #if defined(CONFIG_VGA_CONSOLE)
472 if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
473 conswitchp = &vga_con;
474 #elif defined(CONFIG_DUMMY_CONSOLE)
475 conswitchp = &dummy_con;
480 static int __cpuinit get_model_name(struct cpuinfo_x86 *c)
484 if (c->extended_cpuid_level < 0x80000004)
487 v = (unsigned int *) c->x86_model_id;
488 cpuid(0x80000002, &v[0], &v[1], &v[2], &v[3]);
489 cpuid(0x80000003, &v[4], &v[5], &v[6], &v[7]);
490 cpuid(0x80000004, &v[8], &v[9], &v[10], &v[11]);
491 c->x86_model_id[48] = 0;
496 static void __cpuinit display_cacheinfo(struct cpuinfo_x86 *c)
498 unsigned int n, dummy, eax, ebx, ecx, edx;
500 n = c->extended_cpuid_level;
502 if (n >= 0x80000005) {
503 cpuid(0x80000005, &dummy, &ebx, &ecx, &edx);
504 printk(KERN_INFO "CPU: L1 I Cache: %dK (%d bytes/line), "
505 "D cache %dK (%d bytes/line)\n",
506 edx>>24, edx&0xFF, ecx>>24, ecx&0xFF);
507 c->x86_cache_size = (ecx>>24) + (edx>>24);
508 /* On K8 L1 TLB is inclusive, so don't count it */
512 if (n >= 0x80000006) {
513 cpuid(0x80000006, &dummy, &ebx, &ecx, &edx);
514 ecx = cpuid_ecx(0x80000006);
515 c->x86_cache_size = ecx >> 16;
516 c->x86_tlbsize += ((ebx >> 16) & 0xfff) + (ebx & 0xfff);
518 printk(KERN_INFO "CPU: L2 Cache: %dK (%d bytes/line)\n",
519 c->x86_cache_size, ecx & 0xFF);
521 if (n >= 0x80000008) {
522 cpuid(0x80000008, &eax, &dummy, &dummy, &dummy);
523 c->x86_virt_bits = (eax >> 8) & 0xff;
524 c->x86_phys_bits = eax & 0xff;
529 static int __cpuinit nearby_node(int apicid)
533 for (i = apicid - 1; i >= 0; i--) {
534 node = apicid_to_node[i];
535 if (node != NUMA_NO_NODE && node_online(node))
538 for (i = apicid + 1; i < MAX_LOCAL_APIC; i++) {
539 node = apicid_to_node[i];
540 if (node != NUMA_NO_NODE && node_online(node))
543 return first_node(node_online_map); /* Shouldn't happen */
548 * On a AMD dual core setup the lower bits of the APIC id distingush the cores.
549 * Assumes number of cores is a power of two.
551 static void __cpuinit amd_detect_cmp(struct cpuinfo_x86 *c)
556 int cpu = smp_processor_id();
558 unsigned apicid = hard_smp_processor_id();
560 bits = c->x86_coreid_bits;
562 /* Low order bits define the core id (index of core in socket) */
563 c->cpu_core_id = c->initial_apicid & ((1 << bits)-1);
564 /* Convert the initial APIC ID into the socket ID */
565 c->phys_proc_id = c->initial_apicid >> bits;
568 node = c->phys_proc_id;
569 if (apicid_to_node[apicid] != NUMA_NO_NODE)
570 node = apicid_to_node[apicid];
571 if (!node_online(node)) {
572 /* Two possibilities here:
573 - The CPU is missing memory and no node was created.
574 In that case try picking one from a nearby CPU
575 - The APIC IDs differ from the HyperTransport node IDs
576 which the K8 northbridge parsing fills in.
577 Assume they are all increased by a constant offset,
578 but in the same order as the HT nodeids.
579 If that doesn't result in a usable node fall back to the
580 path for the previous case. */
582 int ht_nodeid = c->initial_apicid;
584 if (ht_nodeid >= 0 &&
585 apicid_to_node[ht_nodeid] != NUMA_NO_NODE)
586 node = apicid_to_node[ht_nodeid];
587 /* Pick a nearby node */
588 if (!node_online(node))
589 node = nearby_node(apicid);
591 numa_set_node(cpu, node);
593 printk(KERN_INFO "CPU %d/%x -> Node %d\n", cpu, apicid, node);
598 static void __cpuinit early_init_amd_mc(struct cpuinfo_x86 *c)
603 /* Multi core CPU? */
604 if (c->extended_cpuid_level < 0x80000008)
607 ecx = cpuid_ecx(0x80000008);
609 c->x86_max_cores = (ecx & 0xff) + 1;
611 /* CPU telling us the core id bits shift? */
612 bits = (ecx >> 12) & 0xF;
614 /* Otherwise recompute */
616 while ((1 << bits) < c->x86_max_cores)
620 c->x86_coreid_bits = bits;
625 #define ENABLE_C1E_MASK 0x18000000
626 #define CPUID_PROCESSOR_SIGNATURE 1
627 #define CPUID_XFAM 0x0ff00000
628 #define CPUID_XFAM_K8 0x00000000
629 #define CPUID_XFAM_10H 0x00100000
630 #define CPUID_XFAM_11H 0x00200000
631 #define CPUID_XMOD 0x000f0000
632 #define CPUID_XMOD_REV_F 0x00040000
634 /* AMD systems with C1E don't have a working lAPIC timer. Check for that. */
635 static __cpuinit int amd_apic_timer_broken(void)
637 u32 lo, hi, eax = cpuid_eax(CPUID_PROCESSOR_SIGNATURE);
639 switch (eax & CPUID_XFAM) {
641 if ((eax & CPUID_XMOD) < CPUID_XMOD_REV_F)
645 rdmsr(MSR_K8_ENABLE_C1E, lo, hi);
646 if (lo & ENABLE_C1E_MASK)
650 /* err on the side of caution */
656 static void __cpuinit early_init_amd(struct cpuinfo_x86 *c)
658 early_init_amd_mc(c);
660 /* c->x86_power is 8000_0007 edx. Bit 8 is constant TSC */
661 if (c->x86_power & (1<<8))
662 set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
665 static void __cpuinit init_amd(struct cpuinfo_x86 *c)
673 * Disable TLB flush filter by setting HWCR.FFDIS on K8
674 * bit 6 of msr C001_0015
676 * Errata 63 for SH-B3 steppings
677 * Errata 122 for all steppings (F+ have it disabled by default)
680 rdmsrl(MSR_K8_HWCR, value);
682 wrmsrl(MSR_K8_HWCR, value);
686 /* Bit 31 in normal CPUID used for nonstandard 3DNow ID;
687 3DNow is IDd by bit 31 in extended CPUID (1*32+31) anyway */
688 clear_cpu_cap(c, 0*32+31);
690 /* On C+ stepping K8 rep microcode works well for copy/memset */
691 level = cpuid_eax(1);
692 if (c->x86 == 15 && ((level >= 0x0f48 && level < 0x0f50) ||
694 set_cpu_cap(c, X86_FEATURE_REP_GOOD);
695 if (c->x86 == 0x10 || c->x86 == 0x11)
696 set_cpu_cap(c, X86_FEATURE_REP_GOOD);
698 /* Enable workaround for FXSAVE leak */
700 set_cpu_cap(c, X86_FEATURE_FXSAVE_LEAK);
702 level = get_model_name(c);
706 /* Should distinguish Models here, but this is only
707 a fallback anyways. */
708 strcpy(c->x86_model_id, "Hammer");
712 display_cacheinfo(c);
714 /* Multi core CPU? */
715 if (c->extended_cpuid_level >= 0x80000008)
718 if (c->extended_cpuid_level >= 0x80000006 &&
719 (cpuid_edx(0x80000006) & 0xf000))
720 num_cache_leaves = 4;
722 num_cache_leaves = 3;
724 if (c->x86 == 0xf || c->x86 == 0x10 || c->x86 == 0x11)
725 set_cpu_cap(c, X86_FEATURE_K8);
727 /* MFENCE stops RDTSC speculation */
728 set_cpu_cap(c, X86_FEATURE_MFENCE_RDTSC);
730 if (amd_apic_timer_broken())
731 disable_apic_timer = 1;
733 if (c == &boot_cpu_data && c->x86 >= 0xf && c->x86 <= 0x11) {
734 unsigned long long tseg;
737 * Split up direct mapping around the TSEG SMM area.
738 * Don't do it for gbpages because there seems very little
739 * benefit in doing so.
741 if (!rdmsrl_safe(MSR_K8_TSEG_ADDR, &tseg) &&
742 (tseg >> PMD_SHIFT) < (max_pfn_mapped >> (PMD_SHIFT-PAGE_SHIFT)))
743 set_memory_4k((unsigned long)__va(tseg), 1);
747 void __cpuinit detect_ht(struct cpuinfo_x86 *c)
750 u32 eax, ebx, ecx, edx;
751 int index_msb, core_bits;
753 cpuid(1, &eax, &ebx, &ecx, &edx);
756 if (!cpu_has(c, X86_FEATURE_HT))
758 if (cpu_has(c, X86_FEATURE_CMP_LEGACY))
761 smp_num_siblings = (ebx & 0xff0000) >> 16;
763 if (smp_num_siblings == 1) {
764 printk(KERN_INFO "CPU: Hyper-Threading is disabled\n");
765 } else if (smp_num_siblings > 1) {
767 if (smp_num_siblings > NR_CPUS) {
768 printk(KERN_WARNING "CPU: Unsupported number of "
769 "siblings %d", smp_num_siblings);
770 smp_num_siblings = 1;
774 index_msb = get_count_order(smp_num_siblings);
775 c->phys_proc_id = phys_pkg_id(index_msb);
777 smp_num_siblings = smp_num_siblings / c->x86_max_cores;
779 index_msb = get_count_order(smp_num_siblings);
781 core_bits = get_count_order(c->x86_max_cores);
783 c->cpu_core_id = phys_pkg_id(index_msb) &
784 ((1 << core_bits) - 1);
787 if ((c->x86_max_cores * smp_num_siblings) > 1) {
788 printk(KERN_INFO "CPU: Physical Processor ID: %d\n",
790 printk(KERN_INFO "CPU: Processor Core ID: %d\n",
798 * find out the number of processor cores on the die
800 static int __cpuinit intel_num_cpu_cores(struct cpuinfo_x86 *c)
804 if (c->cpuid_level < 4)
807 cpuid_count(4, 0, &eax, &t, &t, &t);
810 return ((eax >> 26) + 1);
815 static void __cpuinit srat_detect_node(void)
819 int cpu = smp_processor_id();
820 int apicid = hard_smp_processor_id();
822 /* Don't do the funky fallback heuristics the AMD version employs
824 node = apicid_to_node[apicid];
825 if (node == NUMA_NO_NODE || !node_online(node))
826 node = first_node(node_online_map);
827 numa_set_node(cpu, node);
829 printk(KERN_INFO "CPU %d/%x -> Node %d\n", cpu, apicid, node);
833 static void __cpuinit early_init_intel(struct cpuinfo_x86 *c)
835 if ((c->x86 == 0xf && c->x86_model >= 0x03) ||
836 (c->x86 == 0x6 && c->x86_model >= 0x0e))
837 set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
840 static void __cpuinit init_intel(struct cpuinfo_x86 *c)
845 init_intel_cacheinfo(c);
846 if (c->cpuid_level > 9) {
847 unsigned eax = cpuid_eax(10);
848 /* Check for version and the number of counters */
849 if ((eax & 0xff) && (((eax>>8) & 0xff) > 1))
850 set_cpu_cap(c, X86_FEATURE_ARCH_PERFMON);
855 rdmsr(MSR_IA32_MISC_ENABLE, l1, l2);
857 set_cpu_cap(c, X86_FEATURE_BTS);
859 set_cpu_cap(c, X86_FEATURE_PEBS);
866 n = c->extended_cpuid_level;
867 if (n >= 0x80000008) {
868 unsigned eax = cpuid_eax(0x80000008);
869 c->x86_virt_bits = (eax >> 8) & 0xff;
870 c->x86_phys_bits = eax & 0xff;
871 /* CPUID workaround for Intel 0F34 CPU */
872 if (c->x86_vendor == X86_VENDOR_INTEL &&
873 c->x86 == 0xF && c->x86_model == 0x3 &&
875 c->x86_phys_bits = 36;
879 c->x86_cache_alignment = c->x86_clflush_size * 2;
881 set_cpu_cap(c, X86_FEATURE_REP_GOOD);
882 set_cpu_cap(c, X86_FEATURE_LFENCE_RDTSC);
883 c->x86_max_cores = intel_num_cpu_cores(c);
888 static void __cpuinit early_init_centaur(struct cpuinfo_x86 *c)
890 if (c->x86 == 0x6 && c->x86_model >= 0xf)
891 set_bit(X86_FEATURE_CONSTANT_TSC, &c->x86_capability);
894 static void __cpuinit init_centaur(struct cpuinfo_x86 *c)
899 n = c->extended_cpuid_level;
900 if (n >= 0x80000008) {
901 unsigned eax = cpuid_eax(0x80000008);
902 c->x86_virt_bits = (eax >> 8) & 0xff;
903 c->x86_phys_bits = eax & 0xff;
906 if (c->x86 == 0x6 && c->x86_model >= 0xf) {
907 c->x86_cache_alignment = c->x86_clflush_size * 2;
908 set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
909 set_cpu_cap(c, X86_FEATURE_REP_GOOD);
911 set_cpu_cap(c, X86_FEATURE_LFENCE_RDTSC);
914 static void __cpuinit get_cpu_vendor(struct cpuinfo_x86 *c)
916 char *v = c->x86_vendor_id;
918 if (!strcmp(v, "AuthenticAMD"))
919 c->x86_vendor = X86_VENDOR_AMD;
920 else if (!strcmp(v, "GenuineIntel"))
921 c->x86_vendor = X86_VENDOR_INTEL;
922 else if (!strcmp(v, "CentaurHauls"))
923 c->x86_vendor = X86_VENDOR_CENTAUR;
925 c->x86_vendor = X86_VENDOR_UNKNOWN;
928 /* Do some early cpuid on the boot CPU to get some parameter that are
929 needed before check_bugs. Everything advanced is in identify_cpu
931 static void __cpuinit early_identify_cpu(struct cpuinfo_x86 *c)
935 c->loops_per_jiffy = loops_per_jiffy;
936 c->x86_cache_size = -1;
937 c->x86_vendor = X86_VENDOR_UNKNOWN;
938 c->x86_model = c->x86_mask = 0; /* So far unknown... */
939 c->x86_vendor_id[0] = '\0'; /* Unset */
940 c->x86_model_id[0] = '\0'; /* Unset */
941 c->x86_clflush_size = 64;
942 c->x86_cache_alignment = c->x86_clflush_size;
943 c->x86_max_cores = 1;
944 c->x86_coreid_bits = 0;
945 c->extended_cpuid_level = 0;
946 memset(&c->x86_capability, 0, sizeof c->x86_capability);
948 /* Get vendor name */
949 cpuid(0x00000000, (unsigned int *)&c->cpuid_level,
950 (unsigned int *)&c->x86_vendor_id[0],
951 (unsigned int *)&c->x86_vendor_id[8],
952 (unsigned int *)&c->x86_vendor_id[4]);
956 /* Initialize the standard set of capabilities */
957 /* Note that the vendor-specific code below might override */
959 /* Intel-defined flags: level 0x00000001 */
960 if (c->cpuid_level >= 0x00000001) {
962 cpuid(0x00000001, &tfms, &misc, &c->x86_capability[4],
963 &c->x86_capability[0]);
964 c->x86 = (tfms >> 8) & 0xf;
965 c->x86_model = (tfms >> 4) & 0xf;
966 c->x86_mask = tfms & 0xf;
968 c->x86 += (tfms >> 20) & 0xff;
970 c->x86_model += ((tfms >> 16) & 0xF) << 4;
971 if (test_cpu_cap(c, X86_FEATURE_CLFLSH))
972 c->x86_clflush_size = ((misc >> 8) & 0xff) * 8;
974 /* Have CPUID level 0 only - unheard of */
978 c->initial_apicid = (cpuid_ebx(1) >> 24) & 0xff;
980 c->phys_proc_id = c->initial_apicid;
982 /* AMD-defined flags: level 0x80000001 */
983 xlvl = cpuid_eax(0x80000000);
984 c->extended_cpuid_level = xlvl;
985 if ((xlvl & 0xffff0000) == 0x80000000) {
986 if (xlvl >= 0x80000001) {
987 c->x86_capability[1] = cpuid_edx(0x80000001);
988 c->x86_capability[6] = cpuid_ecx(0x80000001);
990 if (xlvl >= 0x80000004)
991 get_model_name(c); /* Default name */
994 /* Transmeta-defined flags: level 0x80860001 */
995 xlvl = cpuid_eax(0x80860000);
996 if ((xlvl & 0xffff0000) == 0x80860000) {
997 /* Don't set x86_cpuid_level here for now to not confuse. */
998 if (xlvl >= 0x80860001)
999 c->x86_capability[2] = cpuid_edx(0x80860001);
1002 c->extended_cpuid_level = cpuid_eax(0x80000000);
1003 if (c->extended_cpuid_level >= 0x80000007)
1004 c->x86_power = cpuid_edx(0x80000007);
1007 clear_cpu_cap(c, X86_FEATURE_PAT);
1009 switch (c->x86_vendor) {
1010 case X86_VENDOR_AMD:
1012 if (c->x86 >= 0xf && c->x86 <= 0x11)
1013 set_cpu_cap(c, X86_FEATURE_PAT);
1015 case X86_VENDOR_INTEL:
1016 early_init_intel(c);
1017 if (c->x86 == 0xF || (c->x86 == 6 && c->x86_model >= 15))
1018 set_cpu_cap(c, X86_FEATURE_PAT);
1020 case X86_VENDOR_CENTAUR:
1021 early_init_centaur(c);
1028 * This does the hard work of actually picking apart the CPU stuff...
1030 void __cpuinit identify_cpu(struct cpuinfo_x86 *c)
1034 early_identify_cpu(c);
1036 init_scattered_cpuid_features(c);
1038 c->apicid = phys_pkg_id(0);
1041 * Vendor-specific initialization. In this section we
1042 * canonicalize the feature flags, meaning if there are
1043 * features a certain CPU supports which CPUID doesn't
1044 * tell us, CPUID claiming incorrect flags, or other bugs,
1045 * we handle them here.
1047 * At the end of this section, c->x86_capability better
1048 * indicate the features this CPU genuinely supports!
1050 switch (c->x86_vendor) {
1051 case X86_VENDOR_AMD:
1055 case X86_VENDOR_INTEL:
1059 case X86_VENDOR_CENTAUR:
1063 case X86_VENDOR_UNKNOWN:
1065 display_cacheinfo(c);
1072 * On SMP, boot_cpu_data holds the common feature set between
1073 * all CPUs; so make sure that we indicate which features are
1074 * common between the CPUs. The first time this routine gets
1075 * executed, c == &boot_cpu_data.
1077 if (c != &boot_cpu_data) {
1078 /* AND the already accumulated flags with these */
1079 for (i = 0; i < NCAPINTS; i++)
1080 boot_cpu_data.x86_capability[i] &= c->x86_capability[i];
1083 /* Clear all flags overriden by options */
1084 for (i = 0; i < NCAPINTS; i++)
1085 c->x86_capability[i] &= ~cleared_cpu_caps[i];
1087 #ifdef CONFIG_X86_MCE
1090 select_idle_routine(c);
1093 numa_add_cpu(smp_processor_id());
1098 void __cpuinit identify_boot_cpu(void)
1100 identify_cpu(&boot_cpu_data);
1103 void __cpuinit identify_secondary_cpu(struct cpuinfo_x86 *c)
1105 BUG_ON(c == &boot_cpu_data);
1110 static __init int setup_noclflush(char *arg)
1112 setup_clear_cpu_cap(X86_FEATURE_CLFLSH);
1115 __setup("noclflush", setup_noclflush);
1117 void __cpuinit print_cpu_info(struct cpuinfo_x86 *c)
1119 if (c->x86_model_id[0])
1120 printk(KERN_CONT "%s", c->x86_model_id);
1122 if (c->x86_mask || c->cpuid_level >= 0)
1123 printk(KERN_CONT " stepping %02x\n", c->x86_mask);
1125 printk(KERN_CONT "\n");
1128 static __init int setup_disablecpuid(char *arg)
1131 if (get_option(&arg, &bit) && bit < NCAPINTS*32)
1132 setup_clear_cpu_cap(bit);
1137 __setup("clearcpuid=", setup_disablecpuid);