arch/x86/kernel/setup_64.c

   1 /*
   2  *  Copyright (C) 1995  Linus Torvalds
   3  */
   4
   5 /*
   6  * This file handles the architecture-dependent parts of initialization
   7  */
   8
   9 #include <linux/errno.h>
  10 #include <linux/sched.h>
  11 #include <linux/kernel.h>
  12 #include <linux/mm.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>
  48
  49 #include <asm/mtrr.h>
  50 #include <asm/uaccess.h>
  51 #include <asm/system.h>
  52 #include <asm/vsyscall.h>
  53 #include <asm/io.h>
  54 #include <asm/smp.h>
  55 #include <asm/msr.h>
  56 #include <asm/desc.h>
  57 #include <video/edid.h>
  58 #include <asm/e820.h>
  59 #include <asm/dma.h>
  60 #include <asm/gart.h>
  61 #include <asm/mpspec.h>
  62 #include <asm/mmu_context.h>
  63 #include <asm/proto.h>
  64 #include <asm/setup.h>
  65 #include <asm/numa.h>
  66 #include <asm/sections.h>
  67 #include <asm/dmi.h>
  68 #include <asm/cacheflush.h>
  69 #include <asm/mce.h>
  70 #include <asm/ds.h>
  71 #include <asm/topology.h>
  72 #include <asm/trampoline.h>
  73 #include <asm/pat.h>
  74 #include <asm/mmconfig.h>
  75
  76 #include <mach_apic.h>
  77 #ifdef CONFIG_PARAVIRT
  78 #include <asm/paravirt.h>
  79 #else
  80 #define ARCH_SETUP
  81 #endif
  82
  83 #include "cpu/cpu.h"
  84
  85 /*
  86  * Machine setup..
  87  */
  88
  89 struct cpuinfo_x86 boot_cpu_data __read_mostly;
  90 EXPORT_SYMBOL(boot_cpu_data);
  91
  92 __u32 cleared_cpu_caps[NCAPINTS] __cpuinitdata;
  93
  94 unsigned long mmu_cr4_features;
  95
  96 /* Boot loader ID as an integer, for the benefit of proc_dointvec */
  97 int bootloader_type;
  98
  99 unsigned long saved_video_mode;
 100
 101 /*
 102  * Early DMI memory
 103  */
 104 int dmi_alloc_index;
 105 char dmi_alloc_data[DMI_MAX_DATA];
 106
 107 /*
 108  * Setup options
 109  */
 110 struct screen_info screen_info;
 111 EXPORT_SYMBOL(screen_info);
 112 struct sys_desc_table_struct {
 113         unsigned short length;
 114         unsigned char table[0];
 115 };
 116
 117 struct edid_info edid_info;
 118 EXPORT_SYMBOL_GPL(edid_info);
 119
 120 extern int root_mountflags;
 121
 122 static char __initdata command_line[COMMAND_LINE_SIZE];
 123
 124 static struct resource standard_io_resources[] = {
 125         { .name = "dma1", .start = 0x00, .end = 0x1f,
 126                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 127         { .name = "pic1", .start = 0x20, .end = 0x21,
 128                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 129         { .name = "timer0", .start = 0x40, .end = 0x43,
 130                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 131         { .name = "timer1", .start = 0x50, .end = 0x53,
 132                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 133         { .name = "keyboard", .start = 0x60, .end = 0x60,
 134                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 135         { .name = "keyboard", .start = 0x64, .end = 0x64,
 136                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 137         { .name = "dma page reg", .start = 0x80, .end = 0x8f,
 138                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 139         { .name = "pic2", .start = 0xa0, .end = 0xa1,
 140                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 141         { .name = "dma2", .start = 0xc0, .end = 0xdf,
 142                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 143         { .name = "fpu", .start = 0xf0, .end = 0xff,
 144                 .flags = IORESOURCE_BUSY | IORESOURCE_IO }
 145 };
 146
 147 #define IORESOURCE_RAM (IORESOURCE_BUSY | IORESOURCE_MEM)
 148
 149 static struct resource data_resource = {
 150         .name = "Kernel data",
 151         .start = 0,
 152         .end = 0,
 153         .flags = IORESOURCE_RAM,
 154 };
 155 static struct resource code_resource = {
 156         .name = "Kernel code",
 157         .start = 0,
 158         .end = 0,
 159         .flags = IORESOURCE_RAM,
 160 };
 161 static struct resource bss_resource = {
 162         .name = "Kernel bss",
 163         .start = 0,
 164         .end = 0,
 165         .flags = IORESOURCE_RAM,
 166 };
 167
 168 static void __init early_cpu_init(void);
 169 static void __cpuinit early_identify_cpu(struct cpuinfo_x86 *c);
 170
 171 #ifdef CONFIG_PROC_VMCORE
 172 /* elfcorehdr= specifies the location of elf core header
 173  * stored by the crashed kernel. This option will be passed
 174  * by kexec loader to the capture kernel.
 175  */
 176 static int __init setup_elfcorehdr(char *arg)
 177 {
 178         char *end;
 179         if (!arg)
 180                 return -EINVAL;
 181         elfcorehdr_addr = memparse(arg, &end);
 182         return end > arg ? 0 : -EINVAL;
 183 }
 184 early_param("elfcorehdr", setup_elfcorehdr);
 185 #endif
 186
 187 #ifndef CONFIG_NUMA
 188 static void __init
 189 contig_initmem_init(unsigned long start_pfn, unsigned long end_pfn)
 190 {
 191         unsigned long bootmap_size, bootmap;
 192
 193         bootmap_size = bootmem_bootmap_pages(end_pfn)<<PAGE_SHIFT;
 194         bootmap = find_e820_area(0, end_pfn<<PAGE_SHIFT, bootmap_size,
 195                                  PAGE_SIZE);
 196         if (bootmap == -1L)
 197                 panic("Cannot find bootmem map of size %ld\n", bootmap_size);
 198         bootmap_size = init_bootmem(bootmap >> PAGE_SHIFT, end_pfn);
 199         e820_register_active_regions(0, start_pfn, end_pfn);
 200         free_bootmem_with_active_regions(0, end_pfn);
 201         early_res_to_bootmem(0, end_pfn<<PAGE_SHIFT);
 202         reserve_bootmem(bootmap, bootmap_size, BOOTMEM_DEFAULT);
 203 }
 204 #endif
 205
 206 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
 207 struct edd edd;
 208 #ifdef CONFIG_EDD_MODULE
 209 EXPORT_SYMBOL(edd);
 210 #endif
 211 /**
 212  * copy_edd() - Copy the BIOS EDD information
 213  *              from boot_params into a safe place.
 214  *
 215  */
 216 static inline void copy_edd(void)
 217 {
 218      memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
 219             sizeof(edd.mbr_signature));
 220      memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
 221      edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
 222      edd.edd_info_nr = boot_params.eddbuf_entries;
 223 }
 224 #else
 225 static inline void copy_edd(void)
 226 {
 227 }
 228 #endif
 229
 230 #ifdef CONFIG_KEXEC
 231 static void __init reserve_crashkernel(void)
 232 {
 233         unsigned long long total_mem;
 234         unsigned long long crash_size, crash_base;
 235         int ret;
 236
 237         total_mem = ((unsigned long long)max_low_pfn - min_low_pfn) << PAGE_SHIFT;
 238
 239         ret = parse_crashkernel(boot_command_line, total_mem,
 240                         &crash_size, &crash_base);
 241         if (ret == 0 && crash_size) {
 242                 if (crash_base <= 0) {
 243                         printk(KERN_INFO "crashkernel reservation failed - "
 244                                         "you have to specify a base address\n");
 245                         return;
 246                 }
 247
 248                 if (reserve_bootmem(crash_base, crash_size,
 249                                         BOOTMEM_EXCLUSIVE) < 0) {
 250                         printk(KERN_INFO "crashkernel reservation failed - "
 251                                         "memory is in use\n");
 252                         return;
 253                 }
 254
 255                 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
 256                                 "for crashkernel (System RAM: %ldMB)\n",
 257                                 (unsigned long)(crash_size >> 20),
 258                                 (unsigned long)(crash_base >> 20),
 259                                 (unsigned long)(total_mem >> 20));
 260                 crashk_res.start = crash_base;
 261                 crashk_res.end   = crash_base + crash_size - 1;
 262                 insert_resource(&iomem_resource, &crashk_res);
 263         }
 264 }
 265 #else
 266 static inline void __init reserve_crashkernel(void)
 267 {}
 268 #endif
 269
 270 /* Overridden in paravirt.c if CONFIG_PARAVIRT */
 271 void __attribute__((weak)) __init memory_setup(void)
 272 {
 273        machine_specific_memory_setup();
 274 }
 275
 276 static void __init parse_setup_data(void)
 277 {
 278         struct setup_data *data;
 279         unsigned long pa_data;
 280
 281         if (boot_params.hdr.version < 0x0209)
 282                 return;
 283         pa_data = boot_params.hdr.setup_data;
 284         while (pa_data) {
 285                 data = early_ioremap(pa_data, PAGE_SIZE);
 286                 switch (data->type) {
 287                 default:
 288                         break;
 289                 }
 290 #ifndef CONFIG_DEBUG_BOOT_PARAMS
 291                 free_early(pa_data, pa_data+sizeof(*data)+data->len);
 292 #endif
 293                 pa_data = data->next;
 294                 early_iounmap(data, PAGE_SIZE);
 295         }
 296 }
 297
 298 /*
 299  * setup_arch - architecture-specific boot-time initializations
 300  *
 301  * Note: On x86_64, fixmaps are ready for use even before this is called.
 302  */
 303 void __init setup_arch(char **cmdline_p)
 304 {
 305         unsigned i;
 306
 307         printk(KERN_INFO "Command line: %s\n", boot_command_line);
 308
 309         ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
 310         screen_info = boot_params.screen_info;
 311         edid_info = boot_params.edid_info;
 312         saved_video_mode = boot_params.hdr.vid_mode;
 313         bootloader_type = boot_params.hdr.type_of_loader;
 314
 315 #ifdef CONFIG_BLK_DEV_RAM
 316         rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
 317         rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
 318         rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
 319 #endif
 320 #ifdef CONFIG_EFI
 321         if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
 322                      "EL64", 4))
 323                 efi_enabled = 1;
 324 #endif
 325
 326         ARCH_SETUP
 327
 328         memory_setup();
 329         copy_edd();
 330
 331         if (!boot_params.hdr.root_flags)
 332                 root_mountflags &= ~MS_RDONLY;
 333         init_mm.start_code = (unsigned long) &_text;
 334         init_mm.end_code = (unsigned long) &_etext;
 335         init_mm.end_data = (unsigned long) &_edata;
 336         init_mm.brk = (unsigned long) &_end;
 337
 338         code_resource.start = virt_to_phys(&_text);
 339         code_resource.end = virt_to_phys(&_etext)-1;
 340         data_resource.start = virt_to_phys(&_etext);
 341         data_resource.end = virt_to_phys(&_edata)-1;
 342         bss_resource.start = virt_to_phys(&__bss_start);
 343         bss_resource.end = virt_to_phys(&__bss_stop)-1;
 344
 345         early_cpu_init();
 346         early_identify_cpu(&boot_cpu_data);
 347
 348         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 349         *cmdline_p = command_line;
 350
 351         parse_setup_data();
 352
 353         parse_early_param();
 354
 355 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
 356         if (init_ohci1394_dma_early)
 357                 init_ohci1394_dma_on_all_controllers();
 358 #endif
 359
 360         finish_e820_parsing();
 361
 362         /* after parse_early_param, so could debug it */
 363         insert_resource(&iomem_resource, &code_resource);
 364         insert_resource(&iomem_resource, &data_resource);
 365         insert_resource(&iomem_resource, &bss_resource);
 366
 367         early_gart_iommu_check();
 368
 369         e820_register_active_regions(0, 0, -1UL);
 370         /*
 371          * partially used pages are not usable - thus
 372          * we are rounding upwards:
 373          */
 374         end_pfn = e820_end_of_ram();
 375         /* update e820 for memory not covered by WB MTRRs */
 376         mtrr_bp_init();
 377         if (mtrr_trim_uncached_memory(end_pfn)) {
 378                 e820_register_active_regions(0, 0, -1UL);
 379                 end_pfn = e820_end_of_ram();
 380         }
 381
 382         num_physpages = end_pfn;
 383
 384         check_efer();
 385
 386         max_pfn_mapped = init_memory_mapping(0, (max_pfn_mapped << PAGE_SHIFT));
 387         if (efi_enabled)
 388                 efi_init();
 389
 390         vsmp_init();
 391
 392         dmi_scan_machine();
 393
 394         io_delay_init();
 395
 396 #ifdef CONFIG_KVM_CLOCK
 397         kvmclock_init();
 398 #endif
 399
 400 #ifdef CONFIG_SMP
 401         /* setup to use the early static init tables during kernel startup */
 402         x86_cpu_to_apicid_early_ptr = (void *)x86_cpu_to_apicid_init;
 403         x86_bios_cpu_apicid_early_ptr = (void *)x86_bios_cpu_apicid_init;
 404 #ifdef CONFIG_NUMA
 405         x86_cpu_to_node_map_early_ptr = (void *)x86_cpu_to_node_map_init;
 406 #endif
 407 #endif
 408
 409 #ifdef CONFIG_ACPI
 410         /*
 411          * Initialize the ACPI boot-time table parser (gets the RSDP and SDT).
 412          * Call this early for SRAT node setup.
 413          */
 414         acpi_boot_table_init();
 415 #endif
 416
 417         /* How many end-of-memory variables you have, grandma! */
 418         max_low_pfn = end_pfn;
 419         max_pfn = end_pfn;
 420         high_memory = (void *)__va(end_pfn * PAGE_SIZE - 1) + 1;
 421
 422         /* Remove active ranges so rediscovery with NUMA-awareness happens */
 423         remove_all_active_ranges();
 424
 425 #ifdef CONFIG_ACPI_NUMA
 426         /*
 427          * Parse SRAT to discover nodes.
 428          */
 429         acpi_numa_init();
 430 #endif
 431
 432 #ifdef CONFIG_NUMA
 433         numa_initmem_init(0, end_pfn);
 434 #else
 435         contig_initmem_init(0, end_pfn);
 436 #endif
 437
 438         dma32_reserve_bootmem();
 439
 440 #ifdef CONFIG_ACPI_SLEEP
 441         /*
 442          * Reserve low memory region for sleep support.
 443          */
 444        acpi_reserve_bootmem();
 445 #endif
 446
 447         if (efi_enabled)
 448                 efi_reserve_bootmem();
 449
 450        /*
 451         * Find and reserve possible boot-time SMP configuration:
 452         */
 453         find_smp_config();
 454 #ifdef CONFIG_BLK_DEV_INITRD
 455         if (boot_params.hdr.type_of_loader && boot_params.hdr.ramdisk_image) {
 456                 unsigned long ramdisk_image = boot_params.hdr.ramdisk_image;
 457                 unsigned long ramdisk_size  = boot_params.hdr.ramdisk_size;
 458                 unsigned long ramdisk_end   = ramdisk_image + ramdisk_size;
 459                 unsigned long end_of_mem    = end_pfn << PAGE_SHIFT;
 460
 461                 if (ramdisk_end <= end_of_mem) {
 462                         /*
 463                          * don't need to reserve again, already reserved early
 464                          * in x86_64_start_kernel, and early_res_to_bootmem
 465                          * convert that to reserved in bootmem
 466                          */
 467                         initrd_start = ramdisk_image + PAGE_OFFSET;
 468                         initrd_end = initrd_start+ramdisk_size;
 469                 } else {
 470                         free_bootmem(ramdisk_image, ramdisk_size);
 471                         printk(KERN_ERR "initrd extends beyond end of memory "
 472                                "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 473                                ramdisk_end, end_of_mem);
 474                         initrd_start = 0;
 475                 }
 476         }
 477 #endif
 478         reserve_crashkernel();
 479
 480         reserve_ibft_region();
 481
 482         paging_init();
 483         map_vsyscall();
 484
 485         early_quirks();
 486
 487 #ifdef CONFIG_ACPI
 488         /*
 489          * Read APIC and some other early information from ACPI tables.
 490          */
 491         acpi_boot_init();
 492 #endif
 493
 494         init_cpu_to_node();
 495
 496         /*
 497          * get boot-time SMP configuration:
 498          */
 499         if (smp_found_config)
 500                 get_smp_config();
 501         init_apic_mappings();
 502         ioapic_init_mappings();
 503
 504         kvm_guest_init();
 505
 506         /*
 507          * We trust e820 completely. No explicit ROM probing in memory.
 508          */
 509         e820_reserve_resources();
 510         e820_mark_nosave_regions();
 511
 512         /* request I/O space for devices used on all i[345]86 PCs */
 513         for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
 514                 request_resource(&ioport_resource, &standard_io_resources[i]);
 515
 516         e820_setup_gap();
 517
 518 #ifdef CONFIG_VT
 519 #if defined(CONFIG_VGA_CONSOLE)
 520         if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
 521                 conswitchp = &vga_con;
 522 #elif defined(CONFIG_DUMMY_CONSOLE)
 523         conswitchp = &dummy_con;
 524 #endif
 525 #endif
 526
 527         /* do this before identify_cpu for boot cpu */
 528         check_enable_amd_mmconf_dmi();
 529 }
 530
 531 struct cpu_dev *cpu_devs[X86_VENDOR_NUM] = {};
 532
 533 static void __cpuinit default_init(struct cpuinfo_x86 *c)
 534 {
 535         display_cacheinfo(c);
 536 }
 537
 538 static struct cpu_dev __cpuinitdata default_cpu = {
 539         .c_init = default_init,
 540         .c_vendor = "Unknown",
 541 };
 542 static struct cpu_dev *this_cpu __cpuinitdata = &default_cpu;
 543
 544 int __cpuinit get_model_name(struct cpuinfo_x86 *c)
 545 {
 546         unsigned int *v;
 547
 548         if (c->extended_cpuid_level < 0x80000004)
 549                 return 0;
 550
 551         v = (unsigned int *) c->x86_model_id;
 552         cpuid(0x80000002, &v[0], &v[1], &v[2], &v[3]);
 553         cpuid(0x80000003, &v[4], &v[5], &v[6], &v[7]);
 554         cpuid(0x80000004, &v[8], &v[9], &v[10], &v[11]);
 555         c->x86_model_id[48] = 0;
 556         return 1;
 557 }
 558
 559
 560 void __cpuinit display_cacheinfo(struct cpuinfo_x86 *c)
 561 {
 562         unsigned int n, dummy, eax, ebx, ecx, edx;
 563
 564         n = c->extended_cpuid_level;
 565
 566         if (n >= 0x80000005) {
 567                 cpuid(0x80000005, &dummy, &ebx, &ecx, &edx);
 568                 printk(KERN_INFO "CPU: L1 I Cache: %dK (%d bytes/line), "
 569                        "D cache %dK (%d bytes/line)\n",
 570                        edx>>24, edx&0xFF, ecx>>24, ecx&0xFF);
 571                 c->x86_cache_size = (ecx>>24) + (edx>>24);
 572                 /* On K8 L1 TLB is inclusive, so don't count it */
 573                 c->x86_tlbsize = 0;
 574         }
 575
 576         if (n >= 0x80000006) {
 577                 cpuid(0x80000006, &dummy, &ebx, &ecx, &edx);
 578                 ecx = cpuid_ecx(0x80000006);
 579                 c->x86_cache_size = ecx >> 16;
 580                 c->x86_tlbsize += ((ebx >> 16) & 0xfff) + (ebx & 0xfff);
 581
 582                 printk(KERN_INFO "CPU: L2 Cache: %dK (%d bytes/line)\n",
 583                 c->x86_cache_size, ecx & 0xFF);
 584         }
 585         if (n >= 0x80000008) {
 586                 cpuid(0x80000008, &eax, &dummy, &dummy, &dummy);
 587                 c->x86_virt_bits = (eax >> 8) & 0xff;
 588                 c->x86_phys_bits = eax & 0xff;
 589         }
 590 }
 591
 592 void __cpuinit detect_ht(struct cpuinfo_x86 *c)
 593 {
 594 #ifdef CONFIG_SMP
 595         u32 eax, ebx, ecx, edx;
 596         int index_msb, core_bits;
 597
 598         cpuid(1, &eax, &ebx, &ecx, &edx);
 599
 600
 601         if (!cpu_has(c, X86_FEATURE_HT))
 602                 return;
 603         if (cpu_has(c, X86_FEATURE_CMP_LEGACY))
 604                 goto out;
 605
 606         smp_num_siblings = (ebx & 0xff0000) >> 16;
 607
 608         if (smp_num_siblings == 1) {
 609                 printk(KERN_INFO  "CPU: Hyper-Threading is disabled\n");
 610         } else if (smp_num_siblings > 1) {
 611
 612                 if (smp_num_siblings > NR_CPUS) {
 613                         printk(KERN_WARNING "CPU: Unsupported number of "
 614                                "siblings %d", smp_num_siblings);
 615                         smp_num_siblings = 1;
 616                         return;
 617                 }
 618
 619                 index_msb = get_count_order(smp_num_siblings);
 620                 c->phys_proc_id = phys_pkg_id(index_msb);
 621
 622                 smp_num_siblings = smp_num_siblings / c->x86_max_cores;
 623
 624                 index_msb = get_count_order(smp_num_siblings);
 625
 626                 core_bits = get_count_order(c->x86_max_cores);
 627
 628                 c->cpu_core_id = phys_pkg_id(index_msb) &
 629                                                ((1 << core_bits) - 1);
 630         }
 631 out:
 632         if ((c->x86_max_cores * smp_num_siblings) > 1) {
 633                 printk(KERN_INFO  "CPU: Physical Processor ID: %d\n",
 634                        c->phys_proc_id);
 635                 printk(KERN_INFO  "CPU: Processor Core ID: %d\n",
 636                        c->cpu_core_id);
 637         }
 638
 639 #endif
 640 }
 641
 642 static void __cpuinit get_cpu_vendor(struct cpuinfo_x86 *c)
 643 {
 644         char *v = c->x86_vendor_id;
 645         int i;
 646         static int printed;
 647
 648         for (i = 0; i < X86_VENDOR_NUM; i++) {
 649                 if (cpu_devs[i]) {
 650                         if (!strcmp(v, cpu_devs[i]->c_ident[0]) ||
 651                             (cpu_devs[i]->c_ident[1] &&
 652                             !strcmp(v, cpu_devs[i]->c_ident[1]))) {
 653                                 c->x86_vendor = i;
 654                                 this_cpu = cpu_devs[i];
 655                                 return;
 656                         }
 657                 }
 658         }
 659         if (!printed) {
 660                 printed++;
 661                 printk(KERN_ERR "CPU: Vendor unknown, using generic init.\n");
 662                 printk(KERN_ERR "CPU: Your system may be unstable.\n");
 663         }
 664         c->x86_vendor = X86_VENDOR_UNKNOWN;
 665 }
 666
 667 static void __init early_cpu_support_print(void)
 668 {
 669         int i,j;
 670         struct cpu_dev *cpu_devx;
 671
 672         printk("KERNEL supported cpus:\n");
 673         for (i = 0; i < X86_VENDOR_NUM; i++) {
 674                 cpu_devx = cpu_devs[i];
 675                 if (!cpu_devx)
 676                         continue;
 677                 for (j = 0; j < 2; j++) {
 678                         if (!cpu_devx->c_ident[j])
 679                                 continue;
 680                         printk("  %s %s\n", cpu_devx->c_vendor,
 681                                 cpu_devx->c_ident[j]);
 682                 }
 683         }
 684 }
 685
 686 static void __init early_cpu_init(void)
 687 {
 688         struct cpu_vendor_dev *cvdev;
 689
 690         for (cvdev = __x86cpuvendor_start ;
 691              cvdev < __x86cpuvendor_end   ;
 692              cvdev++)
 693                 cpu_devs[cvdev->vendor] = cvdev->cpu_dev;
 694         early_cpu_support_print();
 695 }
 696
 697 /* Do some early cpuid on the boot CPU to get some parameter that are
 698    needed before check_bugs. Everything advanced is in identify_cpu
 699    below. */
 700 static void __cpuinit early_identify_cpu(struct cpuinfo_x86 *c)
 701 {
 702         u32 tfms, xlvl;
 703
 704         c->loops_per_jiffy = loops_per_jiffy;
 705         c->x86_cache_size = -1;
 706         c->x86_vendor = X86_VENDOR_UNKNOWN;
 707         c->x86_model = c->x86_mask = 0; /* So far unknown... */
 708         c->x86_vendor_id[0] = '\0'; /* Unset */
 709         c->x86_model_id[0] = '\0';  /* Unset */
 710         c->x86_clflush_size = 64;
 711         c->x86_cache_alignment = c->x86_clflush_size;
 712         c->x86_max_cores = 1;
 713         c->x86_coreid_bits = 0;
 714         c->extended_cpuid_level = 0;
 715         memset(&c->x86_capability, 0, sizeof c->x86_capability);
 716
 717         /* Get vendor name */
 718         cpuid(0x00000000, (unsigned int *)&c->cpuid_level,
 719               (unsigned int *)&c->x86_vendor_id[0],
 720               (unsigned int *)&c->x86_vendor_id[8],
 721               (unsigned int *)&c->x86_vendor_id[4]);
 722
 723         get_cpu_vendor(c);
 724
 725         /* Initialize the standard set of capabilities */
 726         /* Note that the vendor-specific code below might override */
 727
 728         /* Intel-defined flags: level 0x00000001 */
 729         if (c->cpuid_level >= 0x00000001) {
 730                 __u32 misc;
 731                 cpuid(0x00000001, &tfms, &misc, &c->x86_capability[4],
 732                       &c->x86_capability[0]);
 733                 c->x86 = (tfms >> 8) & 0xf;
 734                 c->x86_model = (tfms >> 4) & 0xf;
 735                 c->x86_mask = tfms & 0xf;
 736                 if (c->x86 == 0xf)
 737                         c->x86 += (tfms >> 20) & 0xff;
 738                 if (c->x86 >= 0x6)
 739                         c->x86_model += ((tfms >> 16) & 0xF) << 4;
 740                 if (test_cpu_cap(c, X86_FEATURE_CLFLSH))
 741                         c->x86_clflush_size = ((misc >> 8) & 0xff) * 8;
 742         } else {
 743                 /* Have CPUID level 0 only - unheard of */
 744                 c->x86 = 4;
 745         }
 746
 747         c->initial_apicid = (cpuid_ebx(1) >> 24) & 0xff;
 748 #ifdef CONFIG_SMP
 749         c->phys_proc_id = c->initial_apicid;
 750 #endif
 751         /* AMD-defined flags: level 0x80000001 */
 752         xlvl = cpuid_eax(0x80000000);
 753         c->extended_cpuid_level = xlvl;
 754         if ((xlvl & 0xffff0000) == 0x80000000) {
 755                 if (xlvl >= 0x80000001) {
 756                         c->x86_capability[1] = cpuid_edx(0x80000001);
 757                         c->x86_capability[6] = cpuid_ecx(0x80000001);
 758                 }
 759                 if (xlvl >= 0x80000004)
 760                         get_model_name(c); /* Default name */
 761         }
 762
 763         /* Transmeta-defined flags: level 0x80860001 */
 764         xlvl = cpuid_eax(0x80860000);
 765         if ((xlvl & 0xffff0000) == 0x80860000) {
 766                 /* Don't set x86_cpuid_level here for now to not confuse. */
 767                 if (xlvl >= 0x80860001)
 768                         c->x86_capability[2] = cpuid_edx(0x80860001);
 769         }
 770
 771         c->extended_cpuid_level = cpuid_eax(0x80000000);
 772         if (c->extended_cpuid_level >= 0x80000007)
 773                 c->x86_power = cpuid_edx(0x80000007);
 774
 775         if (c->x86_vendor != X86_VENDOR_UNKNOWN &&
 776             cpu_devs[c->x86_vendor]->c_early_init)
 777                 cpu_devs[c->x86_vendor]->c_early_init(c);
 778
 779         validate_pat_support(c);
 780 }
 781
 782 /*
 783  * This does the hard work of actually picking apart the CPU stuff...
 784  */
 785 void __cpuinit identify_cpu(struct cpuinfo_x86 *c)
 786 {
 787         int i;
 788
 789         early_identify_cpu(c);
 790
 791         init_scattered_cpuid_features(c);
 792
 793         c->apicid = phys_pkg_id(0);
 794
 795         /*
 796          * Vendor-specific initialization.  In this section we
 797          * canonicalize the feature flags, meaning if there are
 798          * features a certain CPU supports which CPUID doesn't
 799          * tell us, CPUID claiming incorrect flags, or other bugs,
 800          * we handle them here.
 801          *
 802          * At the end of this section, c->x86_capability better
 803          * indicate the features this CPU genuinely supports!
 804          */
 805         if (this_cpu->c_init)
 806                 this_cpu->c_init(c);
 807
 808         detect_ht(c);
 809
 810         /*
 811          * On SMP, boot_cpu_data holds the common feature set between
 812          * all CPUs; so make sure that we indicate which features are
 813          * common between the CPUs.  The first time this routine gets
 814          * executed, c == &boot_cpu_data.
 815          */
 816         if (c != &boot_cpu_data) {
 817                 /* AND the already accumulated flags with these */
 818                 for (i = 0; i < NCAPINTS; i++)
 819                         boot_cpu_data.x86_capability[i] &= c->x86_capability[i];
 820         }
 821
 822         /* Clear all flags overriden by options */
 823         for (i = 0; i < NCAPINTS; i++)
 824                 c->x86_capability[i] &= ~cleared_cpu_caps[i];
 825
 826 #ifdef CONFIG_X86_MCE
 827         mcheck_init(c);
 828 #endif
 829         select_idle_routine(c);
 830
 831 #ifdef CONFIG_NUMA
 832         numa_add_cpu(smp_processor_id());
 833 #endif
 834
 835 }
 836
 837 void __cpuinit identify_boot_cpu(void)
 838 {
 839         identify_cpu(&boot_cpu_data);
 840 }
 841
 842 void __cpuinit identify_secondary_cpu(struct cpuinfo_x86 *c)
 843 {
 844         BUG_ON(c == &boot_cpu_data);
 845         identify_cpu(c);
 846         mtrr_ap_init();
 847 }
 848
 849 static __init int setup_noclflush(char *arg)
 850 {
 851         setup_clear_cpu_cap(X86_FEATURE_CLFLSH);
 852         return 1;
 853 }
 854 __setup("noclflush", setup_noclflush);
 855
 856 void __cpuinit print_cpu_info(struct cpuinfo_x86 *c)
 857 {
 858         if (c->x86_model_id[0])
 859                 printk(KERN_CONT "%s", c->x86_model_id);
 860
 861         if (c->x86_mask || c->cpuid_level >= 0)
 862                 printk(KERN_CONT " stepping %02x\n", c->x86_mask);
 863         else
 864                 printk(KERN_CONT "\n");
 865 }
 866
 867 static __init int setup_disablecpuid(char *arg)
 868 {
 869         int bit;
 870         if (get_option(&arg, &bit) && bit < NCAPINTS*32)
 871                 setup_clear_cpu_cap(bit);
 872         else
 873                 return 0;
 874         return 1;
 875 }
 876 __setup("clearcpuid=", setup_disablecpuid);