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