err.no Git - linux-2.6/blob - 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/mpspec.h>
  60 #include <asm/dma.h>
  61 #include <asm/gart.h>
  62 #include <asm/mpspec.h>
  63 #include <asm/mmu_context.h>
  64 #include <asm/proto.h>
  65 #include <asm/setup.h>
  66 #include <asm/numa.h>
  67 #include <asm/sections.h>
  68 #include <asm/dmi.h>
  69 #include <asm/cacheflush.h>
  70 #include <asm/mce.h>
  71 #include <asm/ds.h>
  72 #include <asm/topology.h>
  73 #include <asm/trampoline.h>
  74 #include <asm/pat.h>
  75 #include <asm/mmconfig.h>
  76
  77 #include <mach_apic.h>
  78 #ifdef CONFIG_PARAVIRT
  79 #include <asm/paravirt.h>
  80 #else
  81 #define ARCH_SETUP
  82 #endif
  83
  84 /*
  85  * Machine setup..
  86  */
  87
  88 struct cpuinfo_x86 boot_cpu_data __read_mostly;
  89 EXPORT_SYMBOL(boot_cpu_data);
  90
  91 __u32 cleared_cpu_caps[NCAPINTS] __cpuinitdata;
  92
  93 unsigned long mmu_cr4_features;
  94
  95 /* Boot loader ID as an integer, for the benefit of proc_dointvec */
  96 int bootloader_type;
  97
  98 unsigned long saved_video_mode;
  99
 100 /*
 101  * Early DMI memory
 102  */
 103 int dmi_alloc_index;
 104 char dmi_alloc_data[DMI_MAX_DATA];
 105
 106 /*
 107  * Setup options
 108  */
 109 struct screen_info screen_info;
 110 EXPORT_SYMBOL(screen_info);
 111 struct sys_desc_table_struct {
 112         unsigned short length;
 113         unsigned char table[0];
 114 };
 115
 116 struct edid_info edid_info;
 117 EXPORT_SYMBOL_GPL(edid_info);
 118
 119 extern int root_mountflags;
 120
 121 static char __initdata command_line[COMMAND_LINE_SIZE];
 122
 123 static struct resource standard_io_resources[] = {
 124         { .name = "dma1", .start = 0x00, .end = 0x1f,
 125                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 126         { .name = "pic1", .start = 0x20, .end = 0x21,
 127                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 128         { .name = "timer0", .start = 0x40, .end = 0x43,
 129                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 130         { .name = "timer1", .start = 0x50, .end = 0x53,
 131                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 132         { .name = "keyboard", .start = 0x60, .end = 0x60,
 133                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 134         { .name = "keyboard", .start = 0x64, .end = 0x64,
 135                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 136         { .name = "dma page reg", .start = 0x80, .end = 0x8f,
 137                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 138         { .name = "pic2", .start = 0xa0, .end = 0xa1,
 139                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 140         { .name = "dma2", .start = 0xc0, .end = 0xdf,
 141                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 142         { .name = "fpu", .start = 0xf0, .end = 0xff,
 143                 .flags = IORESOURCE_BUSY | IORESOURCE_IO }
 144 };
 145
 146 #define IORESOURCE_RAM (IORESOURCE_BUSY | IORESOURCE_MEM)
 147
 148 static struct resource data_resource = {
 149         .name = "Kernel data",
 150         .start = 0,
 151         .end = 0,
 152         .flags = IORESOURCE_RAM,
 153 };
 154 static struct resource code_resource = {
 155         .name = "Kernel code",
 156         .start = 0,
 157         .end = 0,
 158         .flags = IORESOURCE_RAM,
 159 };
 160 static struct resource bss_resource = {
 161         .name = "Kernel bss",
 162         .start = 0,
 163         .end = 0,
 164         .flags = IORESOURCE_RAM,
 165 };
 166
 167 static void __init early_cpu_init(void);
 168 static void __cpuinit early_identify_cpu(struct cpuinfo_x86 *c);
 169
 170 #ifdef CONFIG_PROC_VMCORE
 171 /* elfcorehdr= specifies the location of elf core header
 172  * stored by the crashed kernel. This option will be passed
 173  * by kexec loader to the capture kernel.
 174  */
 175 static int __init setup_elfcorehdr(char *arg)
 176 {
 177         char *end;
 178         if (!arg)
 179                 return -EINVAL;
 180         elfcorehdr_addr = memparse(arg, &end);
 181         return end > arg ? 0 : -EINVAL;
 182 }
 183 early_param("elfcorehdr", setup_elfcorehdr);
 184 #endif
 185
 186 #ifndef CONFIG_NUMA
 187 static void __init
 188 contig_initmem_init(unsigned long start_pfn, unsigned long end_pfn)
 189 {
 190         unsigned long bootmap_size, bootmap;
 191
 192         bootmap_size = bootmem_bootmap_pages(end_pfn)<<PAGE_SHIFT;
 193         bootmap = find_e820_area(0, end_pfn<<PAGE_SHIFT, bootmap_size,
 194                                  PAGE_SIZE);
 195         if (bootmap == -1L)
 196                 panic("Cannot find bootmem map of size %ld\n", bootmap_size);
 197         bootmap_size = init_bootmem(bootmap >> PAGE_SHIFT, end_pfn);
 198         e820_register_active_regions(0, start_pfn, end_pfn);
 199         free_bootmem_with_active_regions(0, end_pfn);
 200         early_res_to_bootmem(0, end_pfn<<PAGE_SHIFT);
 201         reserve_bootmem(bootmap, bootmap_size, BOOTMEM_DEFAULT);
 202 }
 203 #endif
 204
 205 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
 206 struct edd edd;
 207 #ifdef CONFIG_EDD_MODULE
 208 EXPORT_SYMBOL(edd);
 209 #endif
 210 /**
 211  * copy_edd() - Copy the BIOS EDD information
 212  *              from boot_params into a safe place.
 213  *
 214  */
 215 static inline void copy_edd(void)
 216 {
 217      memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
 218             sizeof(edd.mbr_signature));
 219      memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
 220      edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
 221      edd.edd_info_nr = boot_params.eddbuf_entries;
 222 }
 223 #else
 224 static inline void copy_edd(void)
 225 {
 226 }
 227 #endif
 228
 229 /* Overridden in paravirt.c if CONFIG_PARAVIRT */
 230 void __attribute__((weak)) __init memory_setup(void)
 231 {
 232        machine_specific_memory_setup();
 233 }
 234
 235 /* Current gdt points %fs at the "master" per-cpu area: after this,
 236  * it's on the real one. */
 237 void switch_to_new_gdt(void)
 238 {
 239         struct desc_ptr gdt_descr;
 240
 241         gdt_descr.address = (long)get_cpu_gdt_table(smp_processor_id());
 242         gdt_descr.size = GDT_SIZE - 1;
 243         load_gdt(&gdt_descr);
 244 }
 245
 246 /*
 247  * setup_arch - architecture-specific boot-time initializations
 248  *
 249  * Note: On x86_64, fixmaps are ready for use even before this is called.
 250  */
 251 void __init setup_arch(char **cmdline_p)
 252 {
 253         unsigned i;
 254
 255         printk(KERN_INFO "Command line: %s\n", boot_command_line);
 256
 257         ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
 258         screen_info = boot_params.screen_info;
 259         edid_info = boot_params.edid_info;
 260         saved_video_mode = boot_params.hdr.vid_mode;
 261         bootloader_type = boot_params.hdr.type_of_loader;
 262
 263 #ifdef CONFIG_BLK_DEV_RAM
 264         rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
 265         rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
 266         rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
 267 #endif
 268 #ifdef CONFIG_EFI
 269         if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
 270                      "EL64", 4)) {
 271                 efi_enabled = 1;
 272                 efi_reserve_early();
 273         }
 274 #endif
 275
 276         ARCH_SETUP
 277
 278         setup_memory_map();
 279         copy_edd();
 280
 281         if (!boot_params.hdr.root_flags)
 282                 root_mountflags &= ~MS_RDONLY;
 283         init_mm.start_code = (unsigned long) &_text;
 284         init_mm.end_code = (unsigned long) &_etext;
 285         init_mm.end_data = (unsigned long) &_edata;
 286         init_mm.brk = (unsigned long) &_end;
 287
 288         code_resource.start = virt_to_phys(&_text);
 289         code_resource.end = virt_to_phys(&_etext)-1;
 290         data_resource.start = virt_to_phys(&_etext);
 291         data_resource.end = virt_to_phys(&_edata)-1;
 292         bss_resource.start = virt_to_phys(&__bss_start);
 293         bss_resource.end = virt_to_phys(&__bss_stop)-1;
 294
 295         early_cpu_init();
 296         early_identify_cpu(&boot_cpu_data);
 297
 298         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 299         *cmdline_p = command_line;
 300
 301         parse_setup_data();
 302
 303         parse_early_param();
 304
 305         if (acpi_mps_check()) {
 306                 disable_apic = 1;
 307                 clear_cpu_cap(&boot_cpu_data, X86_FEATURE_APIC);
 308         }
 309
 310 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
 311         if (init_ohci1394_dma_early)
 312                 init_ohci1394_dma_on_all_controllers();
 313 #endif
 314
 315         finish_e820_parsing();
 316
 317         /* after parse_early_param, so could debug it */
 318         insert_resource(&iomem_resource, &code_resource);
 319         insert_resource(&iomem_resource, &data_resource);
 320         insert_resource(&iomem_resource, &bss_resource);
 321
 322         early_gart_iommu_check();
 323
 324         e820_register_active_regions(0, 0, -1UL);
 325         /*
 326          * partially used pages are not usable - thus
 327          * we are rounding upwards:
 328          */
 329         end_pfn = e820_end_of_ram();
 330
 331         /* pre allocte 4k for mptable mpc */
 332         early_reserve_e820_mpc_new();
 333         /* update e820 for memory not covered by WB MTRRs */
 334         mtrr_bp_init();
 335         if (mtrr_trim_uncached_memory(end_pfn)) {
 336                 remove_all_active_ranges();
 337                 e820_register_active_regions(0, 0, -1UL);
 338                 end_pfn = e820_end_of_ram();
 339         }
 340
 341         num_physpages = end_pfn;
 342
 343         check_efer();
 344
 345         max_pfn_mapped = init_memory_mapping(0, (end_pfn << PAGE_SHIFT));
 346         if (efi_enabled)
 347                 efi_init();
 348
 349         vsmp_init();
 350
 351         dmi_scan_machine();
 352
 353         io_delay_init();
 354
 355 #ifdef CONFIG_KVM_CLOCK
 356         kvmclock_init();
 357 #endif
 358
 359 #ifdef CONFIG_ACPI
 360         /*
 361          * Initialize the ACPI boot-time table parser (gets the RSDP and SDT).
 362          * Call this early for SRAT node setup.
 363          */
 364         acpi_boot_table_init();
 365 #endif
 366
 367         /* How many end-of-memory variables you have, grandma! */
 368         max_low_pfn = end_pfn;
 369         max_pfn = end_pfn;
 370         high_memory = (void *)__va(end_pfn * PAGE_SIZE - 1) + 1;
 371
 372         /* Remove active ranges so rediscovery with NUMA-awareness happens */
 373         remove_all_active_ranges();
 374
 375 #ifdef CONFIG_ACPI_NUMA
 376         /*
 377          * Parse SRAT to discover nodes.
 378          */
 379         acpi_numa_init();
 380 #endif
 381
 382 #ifdef CONFIG_NUMA
 383         numa_initmem_init(0, end_pfn);
 384 #else
 385         contig_initmem_init(0, end_pfn);
 386 #endif
 387
 388         dma32_reserve_bootmem();
 389
 390 #ifdef CONFIG_ACPI_SLEEP
 391         /*
 392          * Reserve low memory region for sleep support.
 393          */
 394        acpi_reserve_bootmem();
 395 #endif
 396
 397 #ifdef CONFIG_X86_MPPARSE
 398        /*
 399         * Find and reserve possible boot-time SMP configuration:
 400         */
 401         find_smp_config();
 402 #endif
 403 #ifdef CONFIG_BLK_DEV_INITRD
 404         if (boot_params.hdr.type_of_loader && boot_params.hdr.ramdisk_image) {
 405                 unsigned long ramdisk_image = boot_params.hdr.ramdisk_image;
 406                 unsigned long ramdisk_size  = boot_params.hdr.ramdisk_size;
 407                 unsigned long ramdisk_end   = ramdisk_image + ramdisk_size;
 408                 unsigned long end_of_mem    = end_pfn << PAGE_SHIFT;
 409
 410                 if (ramdisk_end <= end_of_mem) {
 411                         /*
 412                          * don't need to reserve again, already reserved early
 413                          * in x86_64_start_kernel, and early_res_to_bootmem
 414                          * convert that to reserved in bootmem
 415                          */
 416                         initrd_start = ramdisk_image + PAGE_OFFSET;
 417                         initrd_end = initrd_start+ramdisk_size;
 418                 } else {
 419                         free_bootmem(ramdisk_image, ramdisk_size);
 420                         printk(KERN_ERR "initrd extends beyond end of memory "
 421                                "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 422                                ramdisk_end, end_of_mem);
 423                         initrd_start = 0;
 424                 }
 425         }
 426 #endif
 427         reserve_crashkernel();
 428
 429         reserve_ibft_region();
 430
 431         paging_init();
 432         map_vsyscall();
 433
 434         early_quirks();
 435
 436 #ifdef CONFIG_ACPI
 437         /*
 438          * Read APIC and some other early information from ACPI tables.
 439          */
 440         acpi_boot_init();
 441 #endif
 442
 443         init_cpu_to_node();
 444
 445 #ifdef CONFIG_X86_MPPARSE
 446         /*
 447          * get boot-time SMP configuration:
 448          */
 449         if (smp_found_config)
 450                 get_smp_config();
 451 #endif
 452         init_apic_mappings();
 453         ioapic_init_mappings();
 454
 455         kvm_guest_init();
 456
 457         /*
 458          * We trust e820 completely. No explicit ROM probing in memory.
 459          */
 460         e820_reserve_resources();
 461         e820_mark_nosave_regions(end_pfn);
 462
 463         /* request I/O space for devices used on all i[345]86 PCs */
 464         for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
 465                 request_resource(&ioport_resource, &standard_io_resources[i]);
 466
 467         e820_setup_gap();
 468
 469 #ifdef CONFIG_VT
 470 #if defined(CONFIG_VGA_CONSOLE)
 471         if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
 472                 conswitchp = &vga_con;
 473 #elif defined(CONFIG_DUMMY_CONSOLE)
 474         conswitchp = &dummy_con;
 475 #endif
 476 #endif
 477
 478         /* do this before identify_cpu for boot cpu */
 479         check_enable_amd_mmconf_dmi();
 480 }
 481
 482 struct cpu_dev *cpu_devs[X86_VENDOR_NUM] = {};
 483
 484 static void __cpuinit default_init(struct cpuinfo_x86 *c)
 485 {
 486         display_cacheinfo(c);
 487 }
 488
 489 static struct cpu_dev __cpuinitdata default_cpu = {
 490         .c_init = default_init,
 491         .c_vendor = "Unknown",
 492 };
 493 static struct cpu_dev *this_cpu __cpuinitdata = &default_cpu;
 494
 495 int __cpuinit get_model_name(struct cpuinfo_x86 *c)
 496 {
 497         unsigned int *v;
 498
 499         if (c->extended_cpuid_level < 0x80000004)
 500                 return 0;
 501
 502         v = (unsigned int *) c->x86_model_id;
 503         cpuid(0x80000002, &v[0], &v[1], &v[2], &v[3]);
 504         cpuid(0x80000003, &v[4], &v[5], &v[6], &v[7]);
 505         cpuid(0x80000004, &v[8], &v[9], &v[10], &v[11]);
 506         c->x86_model_id[48] = 0;
 507         return 1;
 508 }
 509
 510
 511 void __cpuinit display_cacheinfo(struct cpuinfo_x86 *c)
 512 {
 513         unsigned int n, dummy, eax, ebx, ecx, edx;
 514
 515         n = c->extended_cpuid_level;
 516
 517         if (n >= 0x80000005) {
 518                 cpuid(0x80000005, &dummy, &ebx, &ecx, &edx);
 519                 printk(KERN_INFO "CPU: L1 I Cache: %dK (%d bytes/line), "
 520                        "D cache %dK (%d bytes/line)\n",
 521                        edx>>24, edx&0xFF, ecx>>24, ecx&0xFF);
 522                 c->x86_cache_size = (ecx>>24) + (edx>>24);
 523                 /* On K8 L1 TLB is inclusive, so don't count it */
 524                 c->x86_tlbsize = 0;
 525         }
 526
 527         if (n >= 0x80000006) {
 528                 cpuid(0x80000006, &dummy, &ebx, &ecx, &edx);
 529                 ecx = cpuid_ecx(0x80000006);
 530                 c->x86_cache_size = ecx >> 16;
 531                 c->x86_tlbsize += ((ebx >> 16) & 0xfff) + (ebx & 0xfff);
 532
 533                 printk(KERN_INFO "CPU: L2 Cache: %dK (%d bytes/line)\n",
 534                 c->x86_cache_size, ecx & 0xFF);
 535         }
 536         if (n >= 0x80000008) {
 537                 cpuid(0x80000008, &eax, &dummy, &dummy, &dummy);
 538                 c->x86_virt_bits = (eax >> 8) & 0xff;
 539                 c->x86_phys_bits = eax & 0xff;
 540         }
 541 }
 542
 543 void __cpuinit detect_ht(struct cpuinfo_x86 *c)
 544 {
 545 #ifdef CONFIG_SMP
 546         u32 eax, ebx, ecx, edx;
 547         int index_msb, core_bits;
 548
 549         cpuid(1, &eax, &ebx, &ecx, &edx);
 550
 551
 552         if (!cpu_has(c, X86_FEATURE_HT))
 553                 return;
 554         if (cpu_has(c, X86_FEATURE_CMP_LEGACY))
 555                 goto out;
 556
 557         smp_num_siblings = (ebx & 0xff0000) >> 16;
 558
 559         if (smp_num_siblings == 1) {
 560                 printk(KERN_INFO  "CPU: Hyper-Threading is disabled\n");
 561         } else if (smp_num_siblings > 1) {
 562
 563                 if (smp_num_siblings > NR_CPUS) {
 564                         printk(KERN_WARNING "CPU: Unsupported number of "
 565                                "siblings %d", smp_num_siblings);
 566                         smp_num_siblings = 1;
 567                         return;
 568                 }
 569
 570                 index_msb = get_count_order(smp_num_siblings);
 571                 c->phys_proc_id = phys_pkg_id(index_msb);
 572
 573                 smp_num_siblings = smp_num_siblings / c->x86_max_cores;
 574
 575                 index_msb = get_count_order(smp_num_siblings);
 576
 577                 core_bits = get_count_order(c->x86_max_cores);
 578
 579                 c->cpu_core_id = phys_pkg_id(index_msb) &
 580                                                ((1 << core_bits) - 1);
 581         }
 582 out:
 583         if ((c->x86_max_cores * smp_num_siblings) > 1) {
 584                 printk(KERN_INFO  "CPU: Physical Processor ID: %d\n",
 585                        c->phys_proc_id);
 586                 printk(KERN_INFO  "CPU: Processor Core ID: %d\n",
 587                        c->cpu_core_id);
 588         }
 589
 590 #endif
 591 }
 592
 593 static void __cpuinit get_cpu_vendor(struct cpuinfo_x86 *c)
 594 {
 595         char *v = c->x86_vendor_id;
 596         int i;
 597         static int printed;
 598
 599         for (i = 0; i < X86_VENDOR_NUM; i++) {
 600                 if (cpu_devs[i]) {
 601                         if (!strcmp(v, cpu_devs[i]->c_ident[0]) ||
 602                             (cpu_devs[i]->c_ident[1] &&
 603                             !strcmp(v, cpu_devs[i]->c_ident[1]))) {
 604                                 c->x86_vendor = i;
 605                                 this_cpu = cpu_devs[i];
 606                                 return;
 607                         }
 608                 }
 609         }
 610         if (!printed) {
 611                 printed++;
 612                 printk(KERN_ERR "CPU: Vendor unknown, using generic init.\n");
 613                 printk(KERN_ERR "CPU: Your system may be unstable.\n");
 614         }
 615         c->x86_vendor = X86_VENDOR_UNKNOWN;
 616 }
 617
 618 static void __init early_cpu_support_print(void)
 619 {
 620         int i,j;
 621         struct cpu_dev *cpu_devx;
 622
 623         printk("KERNEL supported cpus:\n");
 624         for (i = 0; i < X86_VENDOR_NUM; i++) {
 625                 cpu_devx = cpu_devs[i];
 626                 if (!cpu_devx)
 627                         continue;
 628                 for (j = 0; j < 2; j++) {
 629                         if (!cpu_devx->c_ident[j])
 630                                 continue;
 631                         printk("  %s %s\n", cpu_devx->c_vendor,
 632                                 cpu_devx->c_ident[j]);
 633                 }
 634         }
 635 }
 636
 637 static void __init early_cpu_init(void)
 638 {
 639         struct cpu_vendor_dev *cvdev;
 640
 641         for (cvdev = __x86cpuvendor_start ;
 642              cvdev < __x86cpuvendor_end   ;
 643              cvdev++)
 644                 cpu_devs[cvdev->vendor] = cvdev->cpu_dev;
 645         early_cpu_support_print();
 646 }
 647
 648 /* Do some early cpuid on the boot CPU to get some parameter that are
 649    needed before check_bugs. Everything advanced is in identify_cpu
 650    below. */
 651 static void __cpuinit early_identify_cpu(struct cpuinfo_x86 *c)
 652 {
 653         u32 tfms, xlvl;
 654
 655         c->loops_per_jiffy = loops_per_jiffy;
 656         c->x86_cache_size = -1;
 657         c->x86_vendor = X86_VENDOR_UNKNOWN;
 658         c->x86_model = c->x86_mask = 0; /* So far unknown... */
 659         c->x86_vendor_id[0] = '\0'; /* Unset */
 660         c->x86_model_id[0] = '\0';  /* Unset */
 661         c->x86_clflush_size = 64;
 662         c->x86_cache_alignment = c->x86_clflush_size;
 663         c->x86_max_cores = 1;
 664         c->x86_coreid_bits = 0;
 665         c->extended_cpuid_level = 0;
 666         memset(&c->x86_capability, 0, sizeof c->x86_capability);
 667
 668         /* Get vendor name */
 669         cpuid(0x00000000, (unsigned int *)&c->cpuid_level,
 670               (unsigned int *)&c->x86_vendor_id[0],
 671               (unsigned int *)&c->x86_vendor_id[8],
 672               (unsigned int *)&c->x86_vendor_id[4]);
 673
 674         get_cpu_vendor(c);
 675
 676         /* Initialize the standard set of capabilities */
 677         /* Note that the vendor-specific code below might override */
 678
 679         /* Intel-defined flags: level 0x00000001 */
 680         if (c->cpuid_level >= 0x00000001) {
 681                 __u32 misc;
 682                 cpuid(0x00000001, &tfms, &misc, &c->x86_capability[4],
 683                       &c->x86_capability[0]);
 684                 c->x86 = (tfms >> 8) & 0xf;
 685                 c->x86_model = (tfms >> 4) & 0xf;
 686                 c->x86_mask = tfms & 0xf;
 687                 if (c->x86 == 0xf)
 688                         c->x86 += (tfms >> 20) & 0xff;
 689                 if (c->x86 >= 0x6)
 690                         c->x86_model += ((tfms >> 16) & 0xF) << 4;
 691                 if (test_cpu_cap(c, X86_FEATURE_CLFLSH))
 692                         c->x86_clflush_size = ((misc >> 8) & 0xff) * 8;
 693         } else {
 694                 /* Have CPUID level 0 only - unheard of */
 695                 c->x86 = 4;
 696         }
 697
 698         c->initial_apicid = (cpuid_ebx(1) >> 24) & 0xff;
 699 #ifdef CONFIG_SMP
 700         c->phys_proc_id = c->initial_apicid;
 701 #endif
 702         /* AMD-defined flags: level 0x80000001 */
 703         xlvl = cpuid_eax(0x80000000);
 704         c->extended_cpuid_level = xlvl;
 705         if ((xlvl & 0xffff0000) == 0x80000000) {
 706                 if (xlvl >= 0x80000001) {
 707                         c->x86_capability[1] = cpuid_edx(0x80000001);
 708                         c->x86_capability[6] = cpuid_ecx(0x80000001);
 709                 }
 710                 if (xlvl >= 0x80000004)
 711                         get_model_name(c); /* Default name */
 712         }
 713
 714         /* Transmeta-defined flags: level 0x80860001 */
 715         xlvl = cpuid_eax(0x80860000);
 716         if ((xlvl & 0xffff0000) == 0x80860000) {
 717                 /* Don't set x86_cpuid_level here for now to not confuse. */
 718                 if (xlvl >= 0x80860001)
 719                         c->x86_capability[2] = cpuid_edx(0x80860001);
 720         }
 721
 722         c->extended_cpuid_level = cpuid_eax(0x80000000);
 723         if (c->extended_cpuid_level >= 0x80000007)
 724                 c->x86_power = cpuid_edx(0x80000007);
 725
 726         if (c->x86_vendor != X86_VENDOR_UNKNOWN &&
 727             cpu_devs[c->x86_vendor]->c_early_init)
 728                 cpu_devs[c->x86_vendor]->c_early_init(c);
 729
 730         validate_pat_support(c);
 731
 732         /* early_param could clear that, but recall get it set again */
 733         if (disable_apic)
 734                 clear_cpu_cap(c, X86_FEATURE_APIC);
 735 }
 736
 737 /*
 738  * This does the hard work of actually picking apart the CPU stuff...
 739  */
 740 void __cpuinit identify_cpu(struct cpuinfo_x86 *c)
 741 {
 742         int i;
 743
 744         early_identify_cpu(c);
 745
 746         init_scattered_cpuid_features(c);
 747
 748         c->apicid = phys_pkg_id(0);
 749
 750         /*
 751          * Vendor-specific initialization.  In this section we
 752          * canonicalize the feature flags, meaning if there are
 753          * features a certain CPU supports which CPUID doesn't
 754          * tell us, CPUID claiming incorrect flags, or other bugs,
 755          * we handle them here.
 756          *
 757          * At the end of this section, c->x86_capability better
 758          * indicate the features this CPU genuinely supports!
 759          */
 760         if (this_cpu->c_init)
 761                 this_cpu->c_init(c);
 762
 763         detect_ht(c);
 764
 765         /*
 766          * On SMP, boot_cpu_data holds the common feature set between
 767          * all CPUs; so make sure that we indicate which features are
 768          * common between the CPUs.  The first time this routine gets
 769          * executed, c == &boot_cpu_data.
 770          */
 771         if (c != &boot_cpu_data) {
 772                 /* AND the already accumulated flags with these */
 773                 for (i = 0; i < NCAPINTS; i++)
 774                         boot_cpu_data.x86_capability[i] &= c->x86_capability[i];
 775         }
 776
 777         /* Clear all flags overriden by options */
 778         for (i = 0; i < NCAPINTS; i++)
 779                 c->x86_capability[i] &= ~cleared_cpu_caps[i];
 780
 781 #ifdef CONFIG_X86_MCE
 782         mcheck_init(c);
 783 #endif
 784         select_idle_routine(c);
 785
 786 #ifdef CONFIG_NUMA
 787         numa_add_cpu(smp_processor_id());
 788 #endif
 789
 790 }
 791
 792 void __cpuinit identify_boot_cpu(void)
 793 {
 794         identify_cpu(&boot_cpu_data);
 795 }
 796
 797 void __cpuinit identify_secondary_cpu(struct cpuinfo_x86 *c)
 798 {
 799         BUG_ON(c == &boot_cpu_data);
 800         identify_cpu(c);
 801         mtrr_ap_init();
 802 }
 803
 804 static __init int setup_noclflush(char *arg)
 805 {
 806         setup_clear_cpu_cap(X86_FEATURE_CLFLSH);
 807         return 1;
 808 }
 809 __setup("noclflush", setup_noclflush);
 810
 811 void __cpuinit print_cpu_info(struct cpuinfo_x86 *c)
 812 {
 813         if (c->x86_model_id[0])
 814                 printk(KERN_CONT "%s", c->x86_model_id);
 815
 816         if (c->x86_mask || c->cpuid_level >= 0)
 817                 printk(KERN_CONT " stepping %02x\n", c->x86_mask);
 818         else
 819                 printk(KERN_CONT "\n");
 820 }
 821
 822 static __init int setup_disablecpuid(char *arg)
 823 {
 824         int bit;
 825         if (get_option(&arg, &bit) && bit < NCAPINTS*32)
 826                 setup_clear_cpu_cap(bit);
 827         else
 828                 return 0;
 829         return 1;
 830 }
 831 __setup("clearcpuid=", setup_disablecpuid);