arch/x86_64/kernel/setup.c

   1 /*
   2  *  linux/arch/x86-64/kernel/setup.c
   3  *
   4  *  Copyright (C) 1995  Linus Torvalds
   5  *
   6  *  Nov 2001 Dave Jones <davej@suse.de>
   7  *  Forked from i386 setup code.
   8  *
   9  *  $Id$
  10  */
  11
  12 /*
  13  * This file handles the architecture-dependent parts of initialization
  14  */
  15
  16 #include <linux/errno.h>
  17 #include <linux/sched.h>
  18 #include <linux/kernel.h>
  19 #include <linux/mm.h>
  20 #include <linux/stddef.h>
  21 #include <linux/unistd.h>
  22 #include <linux/ptrace.h>
  23 #include <linux/slab.h>
  24 #include <linux/user.h>
  25 #include <linux/a.out.h>
  26 #include <linux/tty.h>
  27 #include <linux/ioport.h>
  28 #include <linux/delay.h>
  29 #include <linux/config.h>
  30 #include <linux/init.h>
  31 #include <linux/initrd.h>
  32 #include <linux/highmem.h>
  33 #include <linux/bootmem.h>
  34 #include <linux/module.h>
  35 #include <asm/processor.h>
  36 #include <linux/console.h>
  37 #include <linux/seq_file.h>
  38 #include <linux/root_dev.h>
  39 #include <linux/pci.h>
  40 #include <linux/acpi.h>
  41 #include <linux/kallsyms.h>
  42 #include <linux/edd.h>
  43 #include <asm/mtrr.h>
  44 #include <asm/uaccess.h>
  45 #include <asm/system.h>
  46 #include <asm/io.h>
  47 #include <asm/smp.h>
  48 #include <asm/msr.h>
  49 #include <asm/desc.h>
  50 #include <video/edid.h>
  51 #include <asm/e820.h>
  52 #include <asm/dma.h>
  53 #include <asm/mpspec.h>
  54 #include <asm/mmu_context.h>
  55 #include <asm/bootsetup.h>
  56 #include <asm/proto.h>
  57 #include <asm/setup.h>
  58 #include <asm/mach_apic.h>
  59 #include <asm/numa.h>
  60
  61 /*
  62  * Machine setup..
  63  */
  64
  65 struct cpuinfo_x86 boot_cpu_data;
  66
  67 unsigned long mmu_cr4_features;
  68
  69 int acpi_disabled;
  70 EXPORT_SYMBOL(acpi_disabled);
  71 #ifdef  CONFIG_ACPI_BOOT
  72 extern int __initdata acpi_ht;
  73 extern acpi_interrupt_flags     acpi_sci_flags;
  74 int __initdata acpi_force = 0;
  75 #endif
  76
  77 int acpi_numa __initdata;
  78
  79 /* Boot loader ID as an integer, for the benefit of proc_dointvec */
  80 int bootloader_type;
  81
  82 unsigned long saved_video_mode;
  83
  84 #ifdef CONFIG_SWIOTLB
  85 int swiotlb;
  86 EXPORT_SYMBOL(swiotlb);
  87 #endif
  88
  89 /*
  90  * Setup options
  91  */
  92 struct drive_info_struct { char dummy[32]; } drive_info;
  93 struct screen_info screen_info;
  94 struct sys_desc_table_struct {
  95         unsigned short length;
  96         unsigned char table[0];
  97 };
  98
  99 struct edid_info edid_info;
 100 struct e820map e820;
 101
 102 extern int root_mountflags;
 103 extern char _text, _etext, _edata, _end;
 104
 105 char command_line[COMMAND_LINE_SIZE];
 106
 107 struct resource standard_io_resources[] = {
 108         { .name = "dma1", .start = 0x00, .end = 0x1f,
 109                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 110         { .name = "pic1", .start = 0x20, .end = 0x21,
 111                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 112         { .name = "timer0", .start = 0x40, .end = 0x43,
 113                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 114         { .name = "timer1", .start = 0x50, .end = 0x53,
 115                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 116         { .name = "keyboard", .start = 0x60, .end = 0x6f,
 117                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 118         { .name = "dma page reg", .start = 0x80, .end = 0x8f,
 119                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 120         { .name = "pic2", .start = 0xa0, .end = 0xa1,
 121                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 122         { .name = "dma2", .start = 0xc0, .end = 0xdf,
 123                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 124         { .name = "fpu", .start = 0xf0, .end = 0xff,
 125                 .flags = IORESOURCE_BUSY | IORESOURCE_IO }
 126 };
 127
 128 #define STANDARD_IO_RESOURCES \
 129         (sizeof standard_io_resources / sizeof standard_io_resources[0])
 130
 131 #define IORESOURCE_RAM (IORESOURCE_BUSY | IORESOURCE_MEM)
 132
 133 struct resource data_resource = {
 134         .name = "Kernel data",
 135         .start = 0,
 136         .end = 0,
 137         .flags = IORESOURCE_RAM,
 138 };
 139 struct resource code_resource = {
 140         .name = "Kernel code",
 141         .start = 0,
 142         .end = 0,
 143         .flags = IORESOURCE_RAM,
 144 };
 145
 146 #define IORESOURCE_ROM (IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM)
 147
 148 static struct resource system_rom_resource = {
 149         .name = "System ROM",
 150         .start = 0xf0000,
 151         .end = 0xfffff,
 152         .flags = IORESOURCE_ROM,
 153 };
 154
 155 static struct resource extension_rom_resource = {
 156         .name = "Extension ROM",
 157         .start = 0xe0000,
 158         .end = 0xeffff,
 159         .flags = IORESOURCE_ROM,
 160 };
 161
 162 static struct resource adapter_rom_resources[] = {
 163         { .name = "Adapter ROM", .start = 0xc8000, .end = 0,
 164                 .flags = IORESOURCE_ROM },
 165         { .name = "Adapter ROM", .start = 0, .end = 0,
 166                 .flags = IORESOURCE_ROM },
 167         { .name = "Adapter ROM", .start = 0, .end = 0,
 168                 .flags = IORESOURCE_ROM },
 169         { .name = "Adapter ROM", .start = 0, .end = 0,
 170                 .flags = IORESOURCE_ROM },
 171         { .name = "Adapter ROM", .start = 0, .end = 0,
 172                 .flags = IORESOURCE_ROM },
 173         { .name = "Adapter ROM", .start = 0, .end = 0,
 174                 .flags = IORESOURCE_ROM }
 175 };
 176
 177 #define ADAPTER_ROM_RESOURCES \
 178         (sizeof adapter_rom_resources / sizeof adapter_rom_resources[0])
 179
 180 static struct resource video_rom_resource = {
 181         .name = "Video ROM",
 182         .start = 0xc0000,
 183         .end = 0xc7fff,
 184         .flags = IORESOURCE_ROM,
 185 };
 186
 187 static struct resource video_ram_resource = {
 188         .name = "Video RAM area",
 189         .start = 0xa0000,
 190         .end = 0xbffff,
 191         .flags = IORESOURCE_RAM,
 192 };
 193
 194 #define romsignature(x) (*(unsigned short *)(x) == 0xaa55)
 195
 196 static int __init romchecksum(unsigned char *rom, unsigned long length)
 197 {
 198         unsigned char *p, sum = 0;
 199
 200         for (p = rom; p < rom + length; p++)
 201                 sum += *p;
 202         return sum == 0;
 203 }
 204
 205 static void __init probe_roms(void)
 206 {
 207         unsigned long start, length, upper;
 208         unsigned char *rom;
 209         int           i;
 210
 211         /* video rom */
 212         upper = adapter_rom_resources[0].start;
 213         for (start = video_rom_resource.start; start < upper; start += 2048) {
 214                 rom = isa_bus_to_virt(start);
 215                 if (!romsignature(rom))
 216                         continue;
 217
 218                 video_rom_resource.start = start;
 219
 220                 /* 0 < length <= 0x7f * 512, historically */
 221                 length = rom[2] * 512;
 222
 223                 /* if checksum okay, trust length byte */
 224                 if (length && romchecksum(rom, length))
 225                         video_rom_resource.end = start + length - 1;
 226
 227                 request_resource(&iomem_resource, &video_rom_resource);
 228                 break;
 229                         }
 230
 231         start = (video_rom_resource.end + 1 + 2047) & ~2047UL;
 232         if (start < upper)
 233                 start = upper;
 234
 235         /* system rom */
 236         request_resource(&iomem_resource, &system_rom_resource);
 237         upper = system_rom_resource.start;
 238
 239         /* check for extension rom (ignore length byte!) */
 240         rom = isa_bus_to_virt(extension_rom_resource.start);
 241         if (romsignature(rom)) {
 242                 length = extension_rom_resource.end - extension_rom_resource.start + 1;
 243                 if (romchecksum(rom, length)) {
 244                         request_resource(&iomem_resource, &extension_rom_resource);
 245                         upper = extension_rom_resource.start;
 246                 }
 247         }
 248
 249         /* check for adapter roms on 2k boundaries */
 250         for (i = 0; i < ADAPTER_ROM_RESOURCES && start < upper; start += 2048) {
 251                 rom = isa_bus_to_virt(start);
 252                 if (!romsignature(rom))
 253                         continue;
 254
 255                 /* 0 < length <= 0x7f * 512, historically */
 256                 length = rom[2] * 512;
 257
 258                 /* but accept any length that fits if checksum okay */
 259                 if (!length || start + length > upper || !romchecksum(rom, length))
 260                         continue;
 261
 262                 adapter_rom_resources[i].start = start;
 263                 adapter_rom_resources[i].end = start + length - 1;
 264                 request_resource(&iomem_resource, &adapter_rom_resources[i]);
 265
 266                 start = adapter_rom_resources[i++].end & ~2047UL;
 267         }
 268 }
 269
 270 static __init void parse_cmdline_early (char ** cmdline_p)
 271 {
 272         char c = ' ', *to = command_line, *from = COMMAND_LINE;
 273         int len = 0;
 274
 275         /* Save unparsed command line copy for /proc/cmdline */
 276         memcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
 277         saved_command_line[COMMAND_LINE_SIZE-1] = '\0';
 278
 279         for (;;) {
 280                 if (c != ' ')
 281                         goto next_char;
 282
 283 #ifdef  CONFIG_SMP
 284                 /*
 285                  * If the BIOS enumerates physical processors before logical,
 286                  * maxcpus=N at enumeration-time can be used to disable HT.
 287                  */
 288                 else if (!memcmp(from, "maxcpus=", 8)) {
 289                         extern unsigned int maxcpus;
 290
 291                         maxcpus = simple_strtoul(from + 8, NULL, 0);
 292                 }
 293 #endif
 294 #ifdef CONFIG_ACPI_BOOT
 295                 /* "acpi=off" disables both ACPI table parsing and interpreter init */
 296                 if (!memcmp(from, "acpi=off", 8))
 297                         disable_acpi();
 298
 299                 if (!memcmp(from, "acpi=force", 10)) {
 300                         /* add later when we do DMI horrors: */
 301                         acpi_force = 1;
 302                         acpi_disabled = 0;
 303                 }
 304
 305                 /* acpi=ht just means: do ACPI MADT parsing
 306                    at bootup, but don't enable the full ACPI interpreter */
 307                 if (!memcmp(from, "acpi=ht", 7)) {
 308                         if (!acpi_force)
 309                                 disable_acpi();
 310                         acpi_ht = 1;
 311                 }
 312                 else if (!memcmp(from, "pci=noacpi", 10))
 313                         acpi_disable_pci();
 314                 else if (!memcmp(from, "acpi=noirq", 10))
 315                         acpi_noirq_set();
 316
 317                 else if (!memcmp(from, "acpi_sci=edge", 13))
 318                         acpi_sci_flags.trigger =  1;
 319                 else if (!memcmp(from, "acpi_sci=level", 14))
 320                         acpi_sci_flags.trigger = 3;
 321                 else if (!memcmp(from, "acpi_sci=high", 13))
 322                         acpi_sci_flags.polarity = 1;
 323                 else if (!memcmp(from, "acpi_sci=low", 12))
 324                         acpi_sci_flags.polarity = 3;
 325
 326                 /* acpi=strict disables out-of-spec workarounds */
 327                 else if (!memcmp(from, "acpi=strict", 11)) {
 328                         acpi_strict = 1;
 329                 }
 330 #ifdef CONFIG_X86_IO_APIC
 331                 else if (!memcmp(from, "acpi_skip_timer_override", 24))
 332                         acpi_skip_timer_override = 1;
 333 #endif
 334 #endif
 335
 336                 if (!memcmp(from, "nolapic", 7) ||
 337                     !memcmp(from, "disableapic", 11))
 338                         disable_apic = 1;
 339
 340                 if (!memcmp(from, "noapic", 6))
 341                         skip_ioapic_setup = 1;
 342
 343                 if (!memcmp(from, "apic", 4)) {
 344                         skip_ioapic_setup = 0;
 345                         ioapic_force = 1;
 346                 }
 347
 348                 if (!memcmp(from, "mem=", 4))
 349                         parse_memopt(from+4, &from);
 350
 351 #ifdef CONFIG_DISCONTIGMEM
 352                 if (!memcmp(from, "numa=", 5))
 353                         numa_setup(from+5);
 354 #endif
 355
 356 #ifdef CONFIG_GART_IOMMU
 357                 if (!memcmp(from,"iommu=",6)) {
 358                         iommu_setup(from+6);
 359                 }
 360 #endif
 361
 362                 if (!memcmp(from,"oops=panic", 10))
 363                         panic_on_oops = 1;
 364
 365                 if (!memcmp(from, "noexec=", 7))
 366                         nonx_setup(from + 7);
 367
 368         next_char:
 369                 c = *(from++);
 370                 if (!c)
 371                         break;
 372                 if (COMMAND_LINE_SIZE <= ++len)
 373                         break;
 374                 *(to++) = c;
 375         }
 376         *to = '\0';
 377         *cmdline_p = command_line;
 378 }
 379
 380 #ifndef CONFIG_DISCONTIGMEM
 381 static void __init contig_initmem_init(void)
 382 {
 383         unsigned long bootmap_size, bootmap;
 384         bootmap_size = bootmem_bootmap_pages(end_pfn)<<PAGE_SHIFT;
 385         bootmap = find_e820_area(0, end_pfn<<PAGE_SHIFT, bootmap_size);
 386         if (bootmap == -1L)
 387                 panic("Cannot find bootmem map of size %ld\n",bootmap_size);
 388         bootmap_size = init_bootmem(bootmap >> PAGE_SHIFT, end_pfn);
 389         e820_bootmem_free(&contig_page_data, 0, end_pfn << PAGE_SHIFT);
 390         reserve_bootmem(bootmap, bootmap_size);
 391 }
 392 #endif
 393
 394 /* Use inline assembly to define this because the nops are defined
 395    as inline assembly strings in the include files and we cannot
 396    get them easily into strings. */
 397 asm("\t.data\nk8nops: "
 398     K8_NOP1 K8_NOP2 K8_NOP3 K8_NOP4 K8_NOP5 K8_NOP6
 399     K8_NOP7 K8_NOP8);
 400
 401 extern unsigned char k8nops[];
 402 static unsigned char *k8_nops[ASM_NOP_MAX+1] = {
 403      NULL,
 404      k8nops,
 405      k8nops + 1,
 406      k8nops + 1 + 2,
 407      k8nops + 1 + 2 + 3,
 408      k8nops + 1 + 2 + 3 + 4,
 409      k8nops + 1 + 2 + 3 + 4 + 5,
 410      k8nops + 1 + 2 + 3 + 4 + 5 + 6,
 411      k8nops + 1 + 2 + 3 + 4 + 5 + 6 + 7,
 412 };
 413
 414 /* Replace instructions with better alternatives for this CPU type.
 415
 416    This runs before SMP is initialized to avoid SMP problems with
 417    self modifying code. This implies that assymetric systems where
 418    APs have less capabilities than the boot processor are not handled.
 419    In this case boot with "noreplacement". */
 420 void apply_alternatives(void *start, void *end)
 421 {
 422         struct alt_instr *a;
 423         int diff, i, k;
 424         for (a = start; (void *)a < end; a++) {
 425                 if (!boot_cpu_has(a->cpuid))
 426                         continue;
 427
 428                 BUG_ON(a->replacementlen > a->instrlen);
 429                 __inline_memcpy(a->instr, a->replacement, a->replacementlen);
 430                 diff = a->instrlen - a->replacementlen;
 431
 432                 /* Pad the rest with nops */
 433                 for (i = a->replacementlen; diff > 0; diff -= k, i += k) {
 434                         k = diff;
 435                         if (k > ASM_NOP_MAX)
 436                                 k = ASM_NOP_MAX;
 437                         __inline_memcpy(a->instr + i, k8_nops[k], k);
 438                 }
 439         }
 440 }
 441
 442 static int no_replacement __initdata = 0;
 443
 444 void __init alternative_instructions(void)
 445 {
 446         extern struct alt_instr __alt_instructions[], __alt_instructions_end[];
 447         if (no_replacement)
 448                 return;
 449         apply_alternatives(__alt_instructions, __alt_instructions_end);
 450 }
 451
 452 static int __init noreplacement_setup(char *s)
 453 {
 454      no_replacement = 1;
 455      return 0;
 456 }
 457
 458 __setup("noreplacement", noreplacement_setup);
 459
 460 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
 461 struct edd edd;
 462 #ifdef CONFIG_EDD_MODULE
 463 EXPORT_SYMBOL(edd);
 464 #endif
 465 /**
 466  * copy_edd() - Copy the BIOS EDD information
 467  *              from boot_params into a safe place.
 468  *
 469  */
 470 static inline void copy_edd(void)
 471 {
 472      memcpy(edd.mbr_signature, EDD_MBR_SIGNATURE, sizeof(edd.mbr_signature));
 473      memcpy(edd.edd_info, EDD_BUF, sizeof(edd.edd_info));
 474      edd.mbr_signature_nr = EDD_MBR_SIG_NR;
 475      edd.edd_info_nr = EDD_NR;
 476 }
 477 #else
 478 static inline void copy_edd(void)
 479 {
 480 }
 481 #endif
 482
 483 #define EBDA_ADDR_POINTER 0x40E
 484 static void __init reserve_ebda_region(void)
 485 {
 486         unsigned int addr;
 487         /**
 488          * there is a real-mode segmented pointer pointing to the
 489          * 4K EBDA area at 0x40E
 490          */
 491         addr = *(unsigned short *)phys_to_virt(EBDA_ADDR_POINTER);
 492         addr <<= 4;
 493         if (addr)
 494                 reserve_bootmem_generic(addr, PAGE_SIZE);
 495 }
 496
 497 void __init setup_arch(char **cmdline_p)
 498 {
 499         unsigned long kernel_end;
 500
 501         ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
 502         drive_info = DRIVE_INFO;
 503         screen_info = SCREEN_INFO;
 504         edid_info = EDID_INFO;
 505         saved_video_mode = SAVED_VIDEO_MODE;
 506         bootloader_type = LOADER_TYPE;
 507
 508 #ifdef CONFIG_BLK_DEV_RAM
 509         rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
 510         rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
 511         rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
 512 #endif
 513         setup_memory_region();
 514         copy_edd();
 515
 516         if (!MOUNT_ROOT_RDONLY)
 517                 root_mountflags &= ~MS_RDONLY;
 518         init_mm.start_code = (unsigned long) &_text;
 519         init_mm.end_code = (unsigned long) &_etext;
 520         init_mm.end_data = (unsigned long) &_edata;
 521         init_mm.brk = (unsigned long) &_end;
 522
 523         code_resource.start = virt_to_phys(&_text);
 524         code_resource.end = virt_to_phys(&_etext)-1;
 525         data_resource.start = virt_to_phys(&_etext);
 526         data_resource.end = virt_to_phys(&_edata)-1;
 527
 528         parse_cmdline_early(cmdline_p);
 529
 530         early_identify_cpu(&boot_cpu_data);
 531
 532         /*
 533          * partially used pages are not usable - thus
 534          * we are rounding upwards:
 535          */
 536         end_pfn = e820_end_of_ram();
 537
 538         check_efer();
 539
 540         init_memory_mapping(0, (end_pfn_map << PAGE_SHIFT));
 541
 542 #ifdef CONFIG_ACPI_BOOT
 543         /*
 544          * Initialize the ACPI boot-time table parser (gets the RSDP and SDT).
 545          * Call this early for SRAT node setup.
 546          */
 547         acpi_boot_table_init();
 548 #endif
 549
 550 #ifdef CONFIG_ACPI_NUMA
 551         /*
 552          * Parse SRAT to discover nodes.
 553          */
 554         acpi_numa_init();
 555 #endif
 556
 557 #ifdef CONFIG_DISCONTIGMEM
 558         numa_initmem_init(0, end_pfn);
 559 #else
 560         contig_initmem_init();
 561 #endif
 562
 563         /* Reserve direct mapping */
 564         reserve_bootmem_generic(table_start << PAGE_SHIFT,
 565                                 (table_end - table_start) << PAGE_SHIFT);
 566
 567         /* reserve kernel */
 568         kernel_end = round_up(__pa_symbol(&_end),PAGE_SIZE);
 569         reserve_bootmem_generic(HIGH_MEMORY, kernel_end - HIGH_MEMORY);
 570
 571         /*
 572          * reserve physical page 0 - it's a special BIOS page on many boxes,
 573          * enabling clean reboots, SMP operation, laptop functions.
 574          */
 575         reserve_bootmem_generic(0, PAGE_SIZE);
 576
 577         /* reserve ebda region */
 578         reserve_ebda_region();
 579
 580 #ifdef CONFIG_SMP
 581         /*
 582          * But first pinch a few for the stack/trampoline stuff
 583          * FIXME: Don't need the extra page at 4K, but need to fix
 584          * trampoline before removing it. (see the GDT stuff)
 585          */
 586         reserve_bootmem_generic(PAGE_SIZE, PAGE_SIZE);
 587
 588         /* Reserve SMP trampoline */
 589         reserve_bootmem_generic(SMP_TRAMPOLINE_BASE, PAGE_SIZE);
 590 #endif
 591
 592 #ifdef CONFIG_ACPI_SLEEP
 593        /*
 594         * Reserve low memory region for sleep support.
 595         */
 596        acpi_reserve_bootmem();
 597 #endif
 598 #ifdef CONFIG_X86_LOCAL_APIC
 599         /*
 600          * Find and reserve possible boot-time SMP configuration:
 601          */
 602         find_smp_config();
 603 #endif
 604 #ifdef CONFIG_BLK_DEV_INITRD
 605         if (LOADER_TYPE && INITRD_START) {
 606                 if (INITRD_START + INITRD_SIZE <= (end_pfn << PAGE_SHIFT)) {
 607                         reserve_bootmem_generic(INITRD_START, INITRD_SIZE);
 608                         initrd_start =
 609                                 INITRD_START ? INITRD_START + PAGE_OFFSET : 0;
 610                         initrd_end = initrd_start+INITRD_SIZE;
 611                 }
 612                 else {
 613                         printk(KERN_ERR "initrd extends beyond end of memory "
 614                             "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 615                             (unsigned long)(INITRD_START + INITRD_SIZE),
 616                             (unsigned long)(end_pfn << PAGE_SHIFT));
 617                         initrd_start = 0;
 618                 }
 619         }
 620 #endif
 621         paging_init();
 622
 623         check_ioapic();
 624
 625 #ifdef CONFIG_ACPI_BOOT
 626         /*
 627          * Read APIC and some other early information from ACPI tables.
 628          */
 629         acpi_boot_init();
 630 #endif
 631
 632 #ifdef CONFIG_X86_LOCAL_APIC
 633         /*
 634          * get boot-time SMP configuration:
 635          */
 636         if (smp_found_config)
 637                 get_smp_config();
 638         init_apic_mappings();
 639 #endif
 640
 641         /*
 642          * Request address space for all standard RAM and ROM resources
 643          * and also for regions reported as reserved by the e820.
 644          */
 645         probe_roms();
 646         e820_reserve_resources();
 647
 648         request_resource(&iomem_resource, &video_ram_resource);
 649
 650         {
 651         unsigned i;
 652         /* request I/O space for devices used on all i[345]86 PCs */
 653         for (i = 0; i < STANDARD_IO_RESOURCES; i++)
 654                 request_resource(&ioport_resource, &standard_io_resources[i]);
 655         }
 656
 657         e820_setup_gap();
 658
 659 #ifdef CONFIG_GART_IOMMU
 660        iommu_hole_init();
 661 #endif
 662
 663 #ifdef CONFIG_VT
 664 #if defined(CONFIG_VGA_CONSOLE)
 665         conswitchp = &vga_con;
 666 #elif defined(CONFIG_DUMMY_CONSOLE)
 667         conswitchp = &dummy_con;
 668 #endif
 669 #endif
 670 }
 671
 672 static int __init get_model_name(struct cpuinfo_x86 *c)
 673 {
 674         unsigned int *v;
 675
 676         if (c->extended_cpuid_level < 0x80000004)
 677                 return 0;
 678
 679         v = (unsigned int *) c->x86_model_id;
 680         cpuid(0x80000002, &v[0], &v[1], &v[2], &v[3]);
 681         cpuid(0x80000003, &v[4], &v[5], &v[6], &v[7]);
 682         cpuid(0x80000004, &v[8], &v[9], &v[10], &v[11]);
 683         c->x86_model_id[48] = 0;
 684         return 1;
 685 }
 686
 687
 688 static void __init display_cacheinfo(struct cpuinfo_x86 *c)
 689 {
 690         unsigned int n, dummy, eax, ebx, ecx, edx;
 691
 692         n = c->extended_cpuid_level;
 693
 694         if (n >= 0x80000005) {
 695                 cpuid(0x80000005, &dummy, &ebx, &ecx, &edx);
 696                 printk(KERN_INFO "CPU: L1 I Cache: %dK (%d bytes/line), D cache %dK (%d bytes/line)\n",
 697                         edx>>24, edx&0xFF, ecx>>24, ecx&0xFF);
 698                 c->x86_cache_size=(ecx>>24)+(edx>>24);
 699                 /* On K8 L1 TLB is inclusive, so don't count it */
 700                 c->x86_tlbsize = 0;
 701         }
 702
 703         if (n >= 0x80000006) {
 704                 cpuid(0x80000006, &dummy, &ebx, &ecx, &edx);
 705                 ecx = cpuid_ecx(0x80000006);
 706                 c->x86_cache_size = ecx >> 16;
 707                 c->x86_tlbsize += ((ebx >> 16) & 0xfff) + (ebx & 0xfff);
 708
 709                 printk(KERN_INFO "CPU: L2 Cache: %dK (%d bytes/line)\n",
 710                 c->x86_cache_size, ecx & 0xFF);
 711         }
 712
 713         if (n >= 0x80000007)
 714                 cpuid(0x80000007, &dummy, &dummy, &dummy, &c->x86_power);
 715         if (n >= 0x80000008) {
 716                 cpuid(0x80000008, &eax, &dummy, &dummy, &dummy);
 717                 c->x86_virt_bits = (eax >> 8) & 0xff;
 718                 c->x86_phys_bits = eax & 0xff;
 719         }
 720 }
 721
 722 #ifdef CONFIG_SMP
 723 /*
 724  * On a AMD dual core setup the lower bits of the APIC id distingush the cores.
 725  * Assumes number of cores is a power of two.
 726  */
 727 static void __init amd_detect_cmp(struct cpuinfo_x86 *c)
 728 {
 729 #ifdef CONFIG_SMP
 730         int cpu = c->x86_apicid;
 731         int node = 0;
 732         if (c->x86_num_cores == 1)
 733                 return;
 734         /* Fix up the APIC ID following the AMD specification. */
 735         cpu_core_id[cpu] >>= hweight32(c->x86_num_cores - 1);
 736
 737 #ifdef CONFIG_NUMA
 738         /* When an ACPI SRAT table is available use the mappings from SRAT
 739            instead. */
 740         if (acpi_numa <= 0) {
 741                 node = cpu_core_id[cpu];
 742                 if (!node_online(node))
 743                         node = first_node(node_online_map);
 744                 cpu_to_node[cpu] = node;
 745         } else {
 746                 node = cpu_to_node[cpu];
 747         }
 748 #endif
 749         /* For now: - better than BAD_APIC_ID at least*/
 750         phys_proc_id[cpu] = cpu_core_id[cpu];
 751
 752         printk(KERN_INFO "CPU %d(%d) -> Node %d -> Core %d\n",
 753                         cpu, c->x86_num_cores, node, cpu_core_id[cpu]);
 754 #endif
 755 }
 756 #else
 757 static void __init amd_detect_cmp(struct cpuinfo_x86 *c)
 758 {
 759 }
 760 #endif
 761
 762 static int __init init_amd(struct cpuinfo_x86 *c)
 763 {
 764         int r;
 765         int level;
 766
 767         /* Bit 31 in normal CPUID used for nonstandard 3DNow ID;
 768            3DNow is IDd by bit 31 in extended CPUID (1*32+31) anyway */
 769         clear_bit(0*32+31, &c->x86_capability);
 770
 771         /* C-stepping K8? */
 772         level = cpuid_eax(1);
 773         if ((level >= 0x0f48 && level < 0x0f50) || level >= 0x0f58)
 774                 set_bit(X86_FEATURE_K8_C, &c->x86_capability);
 775
 776         r = get_model_name(c);
 777         if (!r) {
 778                 switch (c->x86) {
 779                 case 15:
 780                         /* Should distinguish Models here, but this is only
 781                            a fallback anyways. */
 782                         strcpy(c->x86_model_id, "Hammer");
 783                         break;
 784                 }
 785         }
 786         display_cacheinfo(c);
 787
 788         if (c->extended_cpuid_level >= 0x80000008) {
 789                 c->x86_num_cores = (cpuid_ecx(0x80000008) & 0xff) + 1;
 790                 if (c->x86_num_cores & (c->x86_num_cores - 1))
 791                         c->x86_num_cores = 1;
 792
 793                 amd_detect_cmp(c);
 794         }
 795
 796         return r;
 797 }
 798
 799 static void __init detect_ht(struct cpuinfo_x86 *c)
 800 {
 801 #ifdef CONFIG_SMP
 802         u32     eax, ebx, ecx, edx;
 803         int     index_msb, tmp;
 804         int     cpu = smp_processor_id();
 805
 806         if (!cpu_has(c, X86_FEATURE_HT) || cpu_has(c, X86_FEATURE_CMP_LEGACY))
 807                 return;
 808
 809         cpuid(1, &eax, &ebx, &ecx, &edx);
 810         smp_num_siblings = (ebx & 0xff0000) >> 16;
 811
 812         if (smp_num_siblings == 1) {
 813                 printk(KERN_INFO  "CPU: Hyper-Threading is disabled\n");
 814         } else if (smp_num_siblings > 1) {
 815                 index_msb = 31;
 816                 /*
 817                  * At this point we only support two siblings per
 818                  * processor package.
 819                  */
 820                 if (smp_num_siblings > NR_CPUS) {
 821                         printk(KERN_WARNING "CPU: Unsupported number of the siblings %d", smp_num_siblings);
 822                         smp_num_siblings = 1;
 823                         return;
 824                 }
 825                 tmp = smp_num_siblings;
 826                 while ((tmp & 0x80000000 ) == 0) {
 827                         tmp <<=1 ;
 828                         index_msb--;
 829                 }
 830                 if (smp_num_siblings & (smp_num_siblings - 1))
 831                         index_msb++;
 832                 phys_proc_id[cpu] = phys_pkg_id(index_msb);
 833
 834                 printk(KERN_INFO  "CPU: Physical Processor ID: %d\n",
 835                        phys_proc_id[cpu]);
 836
 837                 smp_num_siblings = smp_num_siblings / c->x86_num_cores;
 838
 839                 tmp = smp_num_siblings;
 840                 index_msb = 31;
 841                 while ((tmp & 0x80000000) == 0) {
 842                         tmp <<=1 ;
 843                         index_msb--;
 844                 }
 845                 if (smp_num_siblings & (smp_num_siblings - 1))
 846                         index_msb++;
 847
 848                 cpu_core_id[cpu] = phys_pkg_id(index_msb);
 849
 850                 if (c->x86_num_cores > 1)
 851                         printk(KERN_INFO  "CPU: Processor Core ID: %d\n",
 852                                cpu_core_id[cpu]);
 853         }
 854 #endif
 855 }
 856
 857 /*
 858  * find out the number of processor cores on the die
 859  */
 860 static int __init intel_num_cpu_cores(struct cpuinfo_x86 *c)
 861 {
 862         unsigned int eax;
 863
 864         if (c->cpuid_level < 4)
 865                 return 1;
 866
 867         __asm__("cpuid"
 868                 : "=a" (eax)
 869                 : "0" (4), "c" (0)
 870                 : "bx", "dx");
 871
 872         if (eax & 0x1f)
 873                 return ((eax >> 26) + 1);
 874         else
 875                 return 1;
 876 }
 877
 878 static void __init init_intel(struct cpuinfo_x86 *c)
 879 {
 880         /* Cache sizes */
 881         unsigned n;
 882
 883         init_intel_cacheinfo(c);
 884         n = c->extended_cpuid_level;
 885         if (n >= 0x80000008) {
 886                 unsigned eax = cpuid_eax(0x80000008);
 887                 c->x86_virt_bits = (eax >> 8) & 0xff;
 888                 c->x86_phys_bits = eax & 0xff;
 889         }
 890
 891         if (c->x86 == 15)
 892                 c->x86_cache_alignment = c->x86_clflush_size * 2;
 893         if (c->x86 >= 15)
 894                 set_bit(X86_FEATURE_CONSTANT_TSC, &c->x86_capability);
 895         c->x86_num_cores = intel_num_cpu_cores(c);
 896 }
 897
 898 void __init get_cpu_vendor(struct cpuinfo_x86 *c)
 899 {
 900         char *v = c->x86_vendor_id;
 901
 902         if (!strcmp(v, "AuthenticAMD"))
 903                 c->x86_vendor = X86_VENDOR_AMD;
 904         else if (!strcmp(v, "GenuineIntel"))
 905                 c->x86_vendor = X86_VENDOR_INTEL;
 906         else
 907                 c->x86_vendor = X86_VENDOR_UNKNOWN;
 908 }
 909
 910 struct cpu_model_info {
 911         int vendor;
 912         int family;
 913         char *model_names[16];
 914 };
 915
 916 /* Do some early cpuid on the boot CPU to get some parameter that are
 917    needed before check_bugs. Everything advanced is in identify_cpu
 918    below. */
 919 void __init early_identify_cpu(struct cpuinfo_x86 *c)
 920 {
 921         u32 tfms;
 922
 923         c->loops_per_jiffy = loops_per_jiffy;
 924         c->x86_cache_size = -1;
 925         c->x86_vendor = X86_VENDOR_UNKNOWN;
 926         c->x86_model = c->x86_mask = 0; /* So far unknown... */
 927         c->x86_vendor_id[0] = '\0'; /* Unset */
 928         c->x86_model_id[0] = '\0';  /* Unset */
 929         c->x86_clflush_size = 64;
 930         c->x86_cache_alignment = c->x86_clflush_size;
 931         c->x86_num_cores = 1;
 932         c->x86_apicid = c == &boot_cpu_data ? 0 : c - cpu_data;
 933         c->extended_cpuid_level = 0;
 934         memset(&c->x86_capability, 0, sizeof c->x86_capability);
 935
 936         /* Get vendor name */
 937         cpuid(0x00000000, (unsigned int *)&c->cpuid_level,
 938               (unsigned int *)&c->x86_vendor_id[0],
 939               (unsigned int *)&c->x86_vendor_id[8],
 940               (unsigned int *)&c->x86_vendor_id[4]);
 941
 942         get_cpu_vendor(c);
 943
 944         /* Initialize the standard set of capabilities */
 945         /* Note that the vendor-specific code below might override */
 946
 947         /* Intel-defined flags: level 0x00000001 */
 948         if (c->cpuid_level >= 0x00000001) {
 949                 __u32 misc;
 950                 cpuid(0x00000001, &tfms, &misc, &c->x86_capability[4],
 951                       &c->x86_capability[0]);
 952                 c->x86 = (tfms >> 8) & 0xf;
 953                 c->x86_model = (tfms >> 4) & 0xf;
 954                 c->x86_mask = tfms & 0xf;
 955                 if (c->x86 == 0xf) {
 956                         c->x86 += (tfms >> 20) & 0xff;
 957                         c->x86_model += ((tfms >> 16) & 0xF) << 4;
 958                 }
 959                 if (c->x86_capability[0] & (1<<19))
 960                         c->x86_clflush_size = ((misc >> 8) & 0xff) * 8;
 961                 c->x86_apicid = misc >> 24;
 962         } else {
 963                 /* Have CPUID level 0 only - unheard of */
 964                 c->x86 = 4;
 965         }
 966
 967 #ifdef CONFIG_SMP
 968         phys_proc_id[smp_processor_id()] =
 969         cpu_core_id[smp_processor_id()] = (cpuid_ebx(1) >> 24) & 0xff;
 970 #endif
 971 }
 972
 973 /*
 974  * This does the hard work of actually picking apart the CPU stuff...
 975  */
 976 void __init identify_cpu(struct cpuinfo_x86 *c)
 977 {
 978         int i;
 979         u32 xlvl;
 980
 981         early_identify_cpu(c);
 982
 983         /* AMD-defined flags: level 0x80000001 */
 984         xlvl = cpuid_eax(0x80000000);
 985         c->extended_cpuid_level = xlvl;
 986         if ((xlvl & 0xffff0000) == 0x80000000) {
 987                 if (xlvl >= 0x80000001) {
 988                         c->x86_capability[1] = cpuid_edx(0x80000001);
 989                         c->x86_capability[6] = cpuid_ecx(0x80000001);
 990                 }
 991                 if (xlvl >= 0x80000004)
 992                         get_model_name(c); /* Default name */
 993         }
 994
 995         /* Transmeta-defined flags: level 0x80860001 */
 996         xlvl = cpuid_eax(0x80860000);
 997         if ((xlvl & 0xffff0000) == 0x80860000) {
 998                 /* Don't set x86_cpuid_level here for now to not confuse. */
 999                 if (xlvl >= 0x80860001)
1000                         c->x86_capability[2] = cpuid_edx(0x80860001);
1001         }
1002
1003         /*
1004          * Vendor-specific initialization.  In this section we
1005          * canonicalize the feature flags, meaning if there are
1006          * features a certain CPU supports which CPUID doesn't
1007          * tell us, CPUID claiming incorrect flags, or other bugs,
1008          * we handle them here.
1009          *
1010          * At the end of this section, c->x86_capability better
1011          * indicate the features this CPU genuinely supports!
1012          */
1013         switch (c->x86_vendor) {
1014         case X86_VENDOR_AMD:
1015                 init_amd(c);
1016                 break;
1017
1018         case X86_VENDOR_INTEL:
1019                 init_intel(c);
1020                 break;
1021
1022         case X86_VENDOR_UNKNOWN:
1023         default:
1024                 display_cacheinfo(c);
1025                 break;
1026         }
1027
1028         select_idle_routine(c);
1029         detect_ht(c);
1030
1031         /*
1032          * On SMP, boot_cpu_data holds the common feature set between
1033          * all CPUs; so make sure that we indicate which features are
1034          * common between the CPUs.  The first time this routine gets
1035          * executed, c == &boot_cpu_data.
1036          */
1037         if (c != &boot_cpu_data) {
1038                 /* AND the already accumulated flags with these */
1039                 for (i = 0 ; i < NCAPINTS ; i++)
1040                         boot_cpu_data.x86_capability[i] &= c->x86_capability[i];
1041         }
1042
1043 #ifdef CONFIG_X86_MCE
1044         mcheck_init(c);
1045 #endif
1046 #ifdef CONFIG_NUMA
1047         if (c != &boot_cpu_data)
1048                 numa_add_cpu(c - cpu_data);
1049 #endif
1050 }
1051
1052
1053 void __init print_cpu_info(struct cpuinfo_x86 *c)
1054 {
1055         if (c->x86_model_id[0])
1056                 printk("%s", c->x86_model_id);
1057
1058         if (c->x86_mask || c->cpuid_level >= 0)
1059                 printk(" stepping %02x\n", c->x86_mask);
1060         else
1061                 printk("\n");
1062 }
1063
1064 /*
1065  *      Get CPU information for use by the procfs.
1066  */
1067
1068 static int show_cpuinfo(struct seq_file *m, void *v)
1069 {
1070         struct cpuinfo_x86 *c = v;
1071
1072         /*
1073          * These flag bits must match the definitions in <asm/cpufeature.h>.
1074          * NULL means this bit is undefined or reserved; either way it doesn't
1075          * have meaning as far as Linux is concerned.  Note that it's important
1076          * to realize there is a difference between this table and CPUID -- if
1077          * applications want to get the raw CPUID data, they should access
1078          * /dev/cpu/<cpu_nr>/cpuid instead.
1079          */
1080         static char *x86_cap_flags[] = {
1081                 /* Intel-defined */
1082                 "fpu", "vme", "de", "pse", "tsc", "msr", "pae", "mce",
1083                 "cx8", "apic", NULL, "sep", "mtrr", "pge", "mca", "cmov",
1084                 "pat", "pse36", "pn", "clflush", NULL, "dts", "acpi", "mmx",
1085                 "fxsr", "sse", "sse2", "ss", "ht", "tm", "ia64", NULL,
1086
1087                 /* AMD-defined */
1088                 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
1089                 NULL, NULL, NULL, "syscall", NULL, NULL, NULL, NULL,
1090                 NULL, NULL, NULL, NULL, "nx", NULL, "mmxext", NULL,
1091                 NULL, "fxsr_opt", NULL, NULL, NULL, "lm", "3dnowext", "3dnow",
1092
1093                 /* Transmeta-defined */
1094                 "recovery", "longrun", NULL, "lrti", NULL, NULL, NULL, NULL,
1095                 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
1096                 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
1097                 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
1098
1099                 /* Other (Linux-defined) */
1100                 "cxmmx", NULL, "cyrix_arr", "centaur_mcr", "k8c+",
1101                 "constant_tsc", NULL, NULL,
1102                 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
1103                 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
1104                 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
1105
1106                 /* Intel-defined (#2) */
1107                 "pni", NULL, NULL, "monitor", "ds_cpl", NULL, NULL, "est",
1108                 "tm2", NULL, "cid", NULL, NULL, "cx16", "xtpr", NULL,
1109                 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
1110                 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
1111
1112                 /* VIA/Cyrix/Centaur-defined */
1113                 NULL, NULL, "rng", "rng_en", NULL, NULL, "ace", "ace_en",
1114                 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
1115                 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
1116                 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
1117
1118                 /* AMD-defined (#2) */
1119                 "lahf_lm", "cmp_legacy", NULL, NULL, NULL, NULL, NULL, NULL,
1120                 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
1121                 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
1122                 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
1123         };
1124         static char *x86_power_flags[] = {
1125                 "ts",   /* temperature sensor */
1126                 "fid",  /* frequency id control */
1127                 "vid",  /* voltage id control */
1128                 "ttp",  /* thermal trip */
1129                 "tm",
1130                 "stc"
1131         };
1132
1133
1134 #ifdef CONFIG_SMP
1135         if (!cpu_online(c-cpu_data))
1136                 return 0;
1137 #endif
1138
1139         seq_printf(m,"processor\t: %u\n"
1140                      "vendor_id\t: %s\n"
1141                      "cpu family\t: %d\n"
1142                      "model\t\t: %d\n"
1143                      "model name\t: %s\n",
1144                      (unsigned)(c-cpu_data),
1145                      c->x86_vendor_id[0] ? c->x86_vendor_id : "unknown",
1146                      c->x86,
1147                      (int)c->x86_model,
1148                      c->x86_model_id[0] ? c->x86_model_id : "unknown");
1149
1150         if (c->x86_mask || c->cpuid_level >= 0)
1151                 seq_printf(m, "stepping\t: %d\n", c->x86_mask);
1152         else
1153                 seq_printf(m, "stepping\t: unknown\n");
1154
1155         if (cpu_has(c,X86_FEATURE_TSC)) {
1156                 seq_printf(m, "cpu MHz\t\t: %u.%03u\n",
1157                              cpu_khz / 1000, (cpu_khz % 1000));
1158         }
1159
1160         /* Cache size */
1161         if (c->x86_cache_size >= 0)
1162                 seq_printf(m, "cache size\t: %d KB\n", c->x86_cache_size);
1163
1164 #ifdef CONFIG_SMP
1165         if (smp_num_siblings * c->x86_num_cores > 1) {
1166                 int cpu = c - cpu_data;
1167                 seq_printf(m, "physical id\t: %d\n", phys_proc_id[cpu]);
1168                 seq_printf(m, "siblings\t: %d\n",
1169                                 c->x86_num_cores * smp_num_siblings);
1170                 seq_printf(m, "core id\t\t: %d\n", cpu_core_id[cpu]);
1171                 seq_printf(m, "cpu cores\t: %d\n", c->x86_num_cores);
1172         }
1173 #endif
1174
1175         seq_printf(m,
1176                 "fpu\t\t: yes\n"
1177                 "fpu_exception\t: yes\n"
1178                 "cpuid level\t: %d\n"
1179                 "wp\t\t: yes\n"
1180                 "flags\t\t:",
1181                    c->cpuid_level);
1182
1183         {
1184                 int i;
1185                 for ( i = 0 ; i < 32*NCAPINTS ; i++ )
1186                         if ( test_bit(i, &c->x86_capability) &&
1187                              x86_cap_flags[i] != NULL )
1188                                 seq_printf(m, " %s", x86_cap_flags[i]);
1189         }
1190
1191         seq_printf(m, "\nbogomips\t: %lu.%02lu\n",
1192                    c->loops_per_jiffy/(500000/HZ),
1193                    (c->loops_per_jiffy/(5000/HZ)) % 100);
1194
1195         if (c->x86_tlbsize > 0)
1196                 seq_printf(m, "TLB size\t: %d 4K pages\n", c->x86_tlbsize);
1197         seq_printf(m, "clflush size\t: %d\n", c->x86_clflush_size);
1198         seq_printf(m, "cache_alignment\t: %d\n", c->x86_cache_alignment);
1199
1200         seq_printf(m, "address sizes\t: %u bits physical, %u bits virtual\n",
1201                    c->x86_phys_bits, c->x86_virt_bits);
1202
1203         seq_printf(m, "power management:");
1204         {
1205                 unsigned i;
1206                 for (i = 0; i < 32; i++)
1207                         if (c->x86_power & (1 << i)) {
1208                                 if (i < ARRAY_SIZE(x86_power_flags))
1209                                         seq_printf(m, " %s", x86_power_flags[i]);
1210                                 else
1211                                         seq_printf(m, " [%d]", i);
1212                         }
1213         }
1214
1215         seq_printf(m, "\n\n");
1216
1217         return 0;
1218 }
1219
1220 static void *c_start(struct seq_file *m, loff_t *pos)
1221 {
1222         return *pos < NR_CPUS ? cpu_data + *pos : NULL;
1223 }
1224
1225 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
1226 {
1227         ++*pos;
1228         return c_start(m, pos);
1229 }
1230
1231 static void c_stop(struct seq_file *m, void *v)
1232 {
1233 }
1234
1235 struct seq_operations cpuinfo_op = {
1236         .start =c_start,
1237         .next = c_next,
1238         .stop = c_stop,
1239         .show = show_cpuinfo,
1240 };