arch/x86/kernel/setup.c

   1 /*
   2  *  Copyright (C) 1995  Linus Torvalds
   3  *
   4  *  Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999
   5  *
   6  *  Memory region support
   7  *      David Parsons <orc@pell.chi.il.us>, July-August 1999
   8  *
   9  *  Added E820 sanitization routine (removes overlapping memory regions);
  10  *  Brian Moyle <bmoyle@mvista.com>, February 2001
  11  *
  12  * Moved CPU detection code to cpu/${cpu}.c
  13  *    Patrick Mochel <mochel@osdl.org>, March 2002
  14  *
  15  *  Provisions for empty E820 memory regions (reported by certain BIOSes).
  16  *  Alex Achenbach <xela@slit.de>, December 2002.
  17  *
  18  */
  19
  20 /*
  21  * This file handles the architecture-dependent parts of initialization
  22  */
  23
  24 #include <linux/sched.h>
  25 #include <linux/mm.h>
  26 #include <linux/mmzone.h>
  27 #include <linux/screen_info.h>
  28 #include <linux/ioport.h>
  29 #include <linux/acpi.h>
  30 #include <linux/apm_bios.h>
  31 #include <linux/initrd.h>
  32 #include <linux/bootmem.h>
  33 #include <linux/seq_file.h>
  34 #include <linux/console.h>
  35 #include <linux/mca.h>
  36 #include <linux/root_dev.h>
  37 #include <linux/highmem.h>
  38 #include <linux/module.h>
  39 #include <linux/efi.h>
  40 #include <linux/init.h>
  41 #include <linux/edd.h>
  42 #include <linux/iscsi_ibft.h>
  43 #include <linux/nodemask.h>
  44 #include <linux/kexec.h>
  45 #include <linux/dmi.h>
  46 #include <linux/pfn.h>
  47 #include <linux/pci.h>
  48 #include <asm/pci-direct.h>
  49 #include <linux/init_ohci1394_dma.h>
  50 #include <linux/kvm_para.h>
  51
  52 #include <linux/errno.h>
  53 #include <linux/kernel.h>
  54 #include <linux/stddef.h>
  55 #include <linux/unistd.h>
  56 #include <linux/ptrace.h>
  57 #include <linux/slab.h>
  58 #include <linux/user.h>
  59 #include <linux/delay.h>
  60
  61 #include <linux/kallsyms.h>
  62 #include <linux/cpufreq.h>
  63 #include <linux/dma-mapping.h>
  64 #include <linux/ctype.h>
  65 #include <linux/uaccess.h>
  66
  67 #include <linux/percpu.h>
  68 #include <linux/crash_dump.h>
  69
  70 #include <video/edid.h>
  71
  72 #include <asm/mtrr.h>
  73 #include <asm/apic.h>
  74 #include <asm/e820.h>
  75 #include <asm/mpspec.h>
  76 #include <asm/setup.h>
  77 #include <asm/efi.h>
  78 #include <asm/timer.h>
  79 #include <asm/i8259.h>
  80 #include <asm/sections.h>
  81 #include <asm/dmi.h>
  82 #include <asm/io_apic.h>
  83 #include <asm/ist.h>
  84 #include <asm/vmi.h>
  85 #include <asm/setup_arch.h>
  86 #include <asm/bios_ebda.h>
  87 #include <asm/cacheflush.h>
  88 #include <asm/processor.h>
  89 #include <asm/bugs.h>
  90
  91 #include <asm/system.h>
  92 #include <asm/vsyscall.h>
  93 #include <asm/cpu.h>
  94 #include <asm/desc.h>
  95 #include <asm/dma.h>
  96 #include <asm/iommu.h>
  97 #include <asm/gart.h>
  98 #include <asm/mmu_context.h>
  99 #include <asm/proto.h>
 100
 101 #include <asm/paravirt.h>
 102 #include <asm/hypervisor.h>
 103
 104 #include <asm/percpu.h>
 105 #include <asm/topology.h>
 106 #include <asm/apicdef.h>
 107 #ifdef CONFIG_X86_64
 108 #include <asm/numa_64.h>
 109 #endif
 110
 111 #ifndef ARCH_SETUP
 112 #define ARCH_SETUP
 113 #endif
 114
 115 /*
 116  * end_pfn only includes RAM, while max_pfn_mapped includes all e820 entries.
 117  * The direct mapping extends to max_pfn_mapped, so that we can directly access
 118  * apertures, ACPI and other tables without having to play with fixmaps.
 119  */
 120 unsigned long max_low_pfn_mapped;
 121 unsigned long max_pfn_mapped;
 122
 123 RESERVE_BRK(dmi_alloc, 65536);
 124
 125 unsigned int boot_cpu_id __read_mostly;
 126
 127 static __initdata unsigned long _brk_start = (unsigned long)__brk_base;
 128 unsigned long _brk_end = (unsigned long)__brk_base;
 129
 130 #ifdef CONFIG_X86_64
 131 int default_cpu_present_to_apicid(int mps_cpu)
 132 {
 133         return __default_cpu_present_to_apicid(mps_cpu);
 134 }
 135
 136 int default_check_phys_apicid_present(int boot_cpu_physical_apicid)
 137 {
 138         return __default_check_phys_apicid_present(boot_cpu_physical_apicid);
 139 }
 140 #endif
 141
 142 #ifndef CONFIG_DEBUG_BOOT_PARAMS
 143 struct boot_params __initdata boot_params;
 144 #else
 145 struct boot_params boot_params;
 146 #endif
 147
 148 /*
 149  * Machine setup..
 150  */
 151 static struct resource data_resource = {
 152         .name   = "Kernel data",
 153         .start  = 0,
 154         .end    = 0,
 155         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 156 };
 157
 158 static struct resource code_resource = {
 159         .name   = "Kernel code",
 160         .start  = 0,
 161         .end    = 0,
 162         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 163 };
 164
 165 static struct resource bss_resource = {
 166         .name   = "Kernel bss",
 167         .start  = 0,
 168         .end    = 0,
 169         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 170 };
 171
 172
 173 #ifdef CONFIG_X86_32
 174 static struct resource video_ram_resource = {
 175         .name   = "Video RAM area",
 176         .start  = 0xa0000,
 177         .end    = 0xbffff,
 178         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 179 };
 180
 181 /* cpu data as detected by the assembly code in head.S */
 182 struct cpuinfo_x86 new_cpu_data __cpuinitdata = {0, 0, 0, 0, -1, 1, 0, 0, -1};
 183 /* common cpu data for all cpus */
 184 struct cpuinfo_x86 boot_cpu_data __read_mostly = {0, 0, 0, 0, -1, 1, 0, 0, -1};
 185 EXPORT_SYMBOL(boot_cpu_data);
 186 static void set_mca_bus(int x)
 187 {
 188 #ifdef CONFIG_MCA
 189         MCA_bus = x;
 190 #endif
 191 }
 192
 193 unsigned int def_to_bigsmp;
 194
 195 /* for MCA, but anyone else can use it if they want */
 196 unsigned int machine_id;
 197 unsigned int machine_submodel_id;
 198 unsigned int BIOS_revision;
 199
 200 struct apm_info apm_info;
 201 EXPORT_SYMBOL(apm_info);
 202
 203 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
 204         defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
 205 struct ist_info ist_info;
 206 EXPORT_SYMBOL(ist_info);
 207 #else
 208 struct ist_info ist_info;
 209 #endif
 210
 211 #else
 212 struct cpuinfo_x86 boot_cpu_data __read_mostly = {
 213         .x86_phys_bits = MAX_PHYSMEM_BITS,
 214 };
 215 EXPORT_SYMBOL(boot_cpu_data);
 216 #endif
 217
 218
 219 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
 220 unsigned long mmu_cr4_features;
 221 #else
 222 unsigned long mmu_cr4_features = X86_CR4_PAE;
 223 #endif
 224
 225 /* Boot loader ID and version as integers, for the benefit of proc_dointvec */
 226 int bootloader_type, bootloader_version;
 227
 228 /*
 229  * Setup options
 230  */
 231 struct screen_info screen_info;
 232 EXPORT_SYMBOL(screen_info);
 233 struct edid_info edid_info;
 234 EXPORT_SYMBOL_GPL(edid_info);
 235
 236 extern int root_mountflags;
 237
 238 unsigned long saved_video_mode;
 239
 240 #define RAMDISK_IMAGE_START_MASK        0x07FF
 241 #define RAMDISK_PROMPT_FLAG             0x8000
 242 #define RAMDISK_LOAD_FLAG               0x4000
 243
 244 static char __initdata command_line[COMMAND_LINE_SIZE];
 245 #ifdef CONFIG_CMDLINE_BOOL
 246 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
 247 #endif
 248
 249 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
 250 struct edd edd;
 251 #ifdef CONFIG_EDD_MODULE
 252 EXPORT_SYMBOL(edd);
 253 #endif
 254 /**
 255  * copy_edd() - Copy the BIOS EDD information
 256  *              from boot_params into a safe place.
 257  *
 258  */
 259 static inline void copy_edd(void)
 260 {
 261      memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
 262             sizeof(edd.mbr_signature));
 263      memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
 264      edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
 265      edd.edd_info_nr = boot_params.eddbuf_entries;
 266 }
 267 #else
 268 static inline void copy_edd(void)
 269 {
 270 }
 271 #endif
 272
 273 void * __init extend_brk(size_t size, size_t align)
 274 {
 275         size_t mask = align - 1;
 276         void *ret;
 277
 278         BUG_ON(_brk_start == 0);
 279         BUG_ON(align & mask);
 280
 281         _brk_end = (_brk_end + mask) & ~mask;
 282         BUG_ON((char *)(_brk_end + size) > __brk_limit);
 283
 284         ret = (void *)_brk_end;
 285         _brk_end += size;
 286
 287         memset(ret, 0, size);
 288
 289         return ret;
 290 }
 291
 292 #ifdef CONFIG_X86_64
 293 static void __init init_gbpages(void)
 294 {
 295         if (direct_gbpages && cpu_has_gbpages)
 296                 printk(KERN_INFO "Using GB pages for direct mapping\n");
 297         else
 298                 direct_gbpages = 0;
 299 }
 300 #else
 301 static inline void init_gbpages(void)
 302 {
 303 }
 304 #endif
 305
 306 static void __init reserve_brk(void)
 307 {
 308         if (_brk_end > _brk_start)
 309                 reserve_early(__pa(_brk_start), __pa(_brk_end), "BRK");
 310
 311         /* Mark brk area as locked down and no longer taking any
 312            new allocations */
 313         _brk_start = 0;
 314 }
 315
 316 #ifdef CONFIG_BLK_DEV_INITRD
 317
 318 #define MAX_MAP_CHUNK   (NR_FIX_BTMAPS << PAGE_SHIFT)
 319 static void __init relocate_initrd(void)
 320 {
 321
 322         u64 ramdisk_image = boot_params.hdr.ramdisk_image;
 323         u64 ramdisk_size  = boot_params.hdr.ramdisk_size;
 324         u64 end_of_lowmem = max_low_pfn_mapped << PAGE_SHIFT;
 325         u64 ramdisk_here;
 326         unsigned long slop, clen, mapaddr;
 327         char *p, *q;
 328
 329         /* We need to move the initrd down into lowmem */
 330         ramdisk_here = find_e820_area(0, end_of_lowmem, ramdisk_size,
 331                                          PAGE_SIZE);
 332
 333         if (ramdisk_here == -1ULL)
 334                 panic("Cannot find place for new RAMDISK of size %lld\n",
 335                          ramdisk_size);
 336
 337         /* Note: this includes all the lowmem currently occupied by
 338            the initrd, we rely on that fact to keep the data intact. */
 339         reserve_early(ramdisk_here, ramdisk_here + ramdisk_size,
 340                          "NEW RAMDISK");
 341         initrd_start = ramdisk_here + PAGE_OFFSET;
 342         initrd_end   = initrd_start + ramdisk_size;
 343         printk(KERN_INFO "Allocated new RAMDISK: %08llx - %08llx\n",
 344                          ramdisk_here, ramdisk_here + ramdisk_size);
 345
 346         q = (char *)initrd_start;
 347
 348         /* Copy any lowmem portion of the initrd */
 349         if (ramdisk_image < end_of_lowmem) {
 350                 clen = end_of_lowmem - ramdisk_image;
 351                 p = (char *)__va(ramdisk_image);
 352                 memcpy(q, p, clen);
 353                 q += clen;
 354                 ramdisk_image += clen;
 355                 ramdisk_size  -= clen;
 356         }
 357
 358         /* Copy the highmem portion of the initrd */
 359         while (ramdisk_size) {
 360                 slop = ramdisk_image & ~PAGE_MASK;
 361                 clen = ramdisk_size;
 362                 if (clen > MAX_MAP_CHUNK-slop)
 363                         clen = MAX_MAP_CHUNK-slop;
 364                 mapaddr = ramdisk_image & PAGE_MASK;
 365                 p = early_memremap(mapaddr, clen+slop);
 366                 memcpy(q, p+slop, clen);
 367                 early_iounmap(p, clen+slop);
 368                 q += clen;
 369                 ramdisk_image += clen;
 370                 ramdisk_size  -= clen;
 371         }
 372         /* high pages is not converted by early_res_to_bootmem */
 373         ramdisk_image = boot_params.hdr.ramdisk_image;
 374         ramdisk_size  = boot_params.hdr.ramdisk_size;
 375         printk(KERN_INFO "Move RAMDISK from %016llx - %016llx to"
 376                 " %08llx - %08llx\n",
 377                 ramdisk_image, ramdisk_image + ramdisk_size - 1,
 378                 ramdisk_here, ramdisk_here + ramdisk_size - 1);
 379 }
 380
 381 static void __init reserve_initrd(void)
 382 {
 383         u64 ramdisk_image = boot_params.hdr.ramdisk_image;
 384         u64 ramdisk_size  = boot_params.hdr.ramdisk_size;
 385         u64 ramdisk_end   = ramdisk_image + ramdisk_size;
 386         u64 end_of_lowmem = max_low_pfn_mapped << PAGE_SHIFT;
 387
 388         if (!boot_params.hdr.type_of_loader ||
 389             !ramdisk_image || !ramdisk_size)
 390                 return;         /* No initrd provided by bootloader */
 391
 392         initrd_start = 0;
 393
 394         if (ramdisk_size >= (end_of_lowmem>>1)) {
 395                 free_early(ramdisk_image, ramdisk_end);
 396                 printk(KERN_ERR "initrd too large to handle, "
 397                        "disabling initrd\n");
 398                 return;
 399         }
 400
 401         printk(KERN_INFO "RAMDISK: %08llx - %08llx\n", ramdisk_image,
 402                         ramdisk_end);
 403
 404
 405         if (ramdisk_end <= end_of_lowmem) {
 406                 /* All in lowmem, easy case */
 407                 /*
 408                  * don't need to reserve again, already reserved early
 409                  * in i386_start_kernel
 410                  */
 411                 initrd_start = ramdisk_image + PAGE_OFFSET;
 412                 initrd_end = initrd_start + ramdisk_size;
 413                 return;
 414         }
 415
 416         relocate_initrd();
 417
 418         free_early(ramdisk_image, ramdisk_end);
 419 }
 420 #else
 421 static void __init reserve_initrd(void)
 422 {
 423 }
 424 #endif /* CONFIG_BLK_DEV_INITRD */
 425
 426 static void __init parse_setup_data(void)
 427 {
 428         struct setup_data *data;
 429         u64 pa_data;
 430
 431         if (boot_params.hdr.version < 0x0209)
 432                 return;
 433         pa_data = boot_params.hdr.setup_data;
 434         while (pa_data) {
 435                 data = early_memremap(pa_data, PAGE_SIZE);
 436                 switch (data->type) {
 437                 case SETUP_E820_EXT:
 438                         parse_e820_ext(data, pa_data);
 439                         break;
 440                 default:
 441                         break;
 442                 }
 443                 pa_data = data->next;
 444                 early_iounmap(data, PAGE_SIZE);
 445         }
 446 }
 447
 448 static void __init e820_reserve_setup_data(void)
 449 {
 450         struct setup_data *data;
 451         u64 pa_data;
 452         int found = 0;
 453
 454         if (boot_params.hdr.version < 0x0209)
 455                 return;
 456         pa_data = boot_params.hdr.setup_data;
 457         while (pa_data) {
 458                 data = early_memremap(pa_data, sizeof(*data));
 459                 e820_update_range(pa_data, sizeof(*data)+data->len,
 460                          E820_RAM, E820_RESERVED_KERN);
 461                 found = 1;
 462                 pa_data = data->next;
 463                 early_iounmap(data, sizeof(*data));
 464         }
 465         if (!found)
 466                 return;
 467
 468         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 469         memcpy(&e820_saved, &e820, sizeof(struct e820map));
 470         printk(KERN_INFO "extended physical RAM map:\n");
 471         e820_print_map("reserve setup_data");
 472 }
 473
 474 static void __init reserve_early_setup_data(void)
 475 {
 476         struct setup_data *data;
 477         u64 pa_data;
 478         char buf[32];
 479
 480         if (boot_params.hdr.version < 0x0209)
 481                 return;
 482         pa_data = boot_params.hdr.setup_data;
 483         while (pa_data) {
 484                 data = early_memremap(pa_data, sizeof(*data));
 485                 sprintf(buf, "setup data %x", data->type);
 486                 reserve_early(pa_data, pa_data+sizeof(*data)+data->len, buf);
 487                 pa_data = data->next;
 488                 early_iounmap(data, sizeof(*data));
 489         }
 490 }
 491
 492 /*
 493  * --------- Crashkernel reservation ------------------------------
 494  */
 495
 496 #ifdef CONFIG_KEXEC
 497
 498 /**
 499  * Reserve @size bytes of crashkernel memory at any suitable offset.
 500  *
 501  * @size: Size of the crashkernel memory to reserve.
 502  * Returns the base address on success, and -1ULL on failure.
 503  */
 504 static
 505 unsigned long long __init find_and_reserve_crashkernel(unsigned long long size)
 506 {
 507         const unsigned long long alignment = 16<<20;    /* 16M */
 508         unsigned long long start = 0LL;
 509
 510         while (1) {
 511                 int ret;
 512
 513                 start = find_e820_area(start, ULONG_MAX, size, alignment);
 514                 if (start == -1ULL)
 515                         return start;
 516
 517                 /* try to reserve it */
 518                 ret = reserve_bootmem_generic(start, size, BOOTMEM_EXCLUSIVE);
 519                 if (ret >= 0)
 520                         return start;
 521
 522                 start += alignment;
 523         }
 524 }
 525
 526 static inline unsigned long long get_total_mem(void)
 527 {
 528         unsigned long long total;
 529
 530         total = max_low_pfn - min_low_pfn;
 531 #ifdef CONFIG_HIGHMEM
 532         total += highend_pfn - highstart_pfn;
 533 #endif
 534
 535         return total << PAGE_SHIFT;
 536 }
 537
 538 static void __init reserve_crashkernel(void)
 539 {
 540         unsigned long long total_mem;
 541         unsigned long long crash_size, crash_base;
 542         int ret;
 543
 544         total_mem = get_total_mem();
 545
 546         ret = parse_crashkernel(boot_command_line, total_mem,
 547                         &crash_size, &crash_base);
 548         if (ret != 0 || crash_size <= 0)
 549                 return;
 550
 551         /* 0 means: find the address automatically */
 552         if (crash_base <= 0) {
 553                 crash_base = find_and_reserve_crashkernel(crash_size);
 554                 if (crash_base == -1ULL) {
 555                         pr_info("crashkernel reservation failed. "
 556                                 "No suitable area found.\n");
 557                         return;
 558                 }
 559         } else {
 560                 ret = reserve_bootmem_generic(crash_base, crash_size,
 561                                         BOOTMEM_EXCLUSIVE);
 562                 if (ret < 0) {
 563                         pr_info("crashkernel reservation failed - "
 564                                 "memory is in use\n");
 565                         return;
 566                 }
 567         }
 568
 569         printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
 570                         "for crashkernel (System RAM: %ldMB)\n",
 571                         (unsigned long)(crash_size >> 20),
 572                         (unsigned long)(crash_base >> 20),
 573                         (unsigned long)(total_mem >> 20));
 574
 575         crashk_res.start = crash_base;
 576         crashk_res.end   = crash_base + crash_size - 1;
 577         insert_resource(&iomem_resource, &crashk_res);
 578 }
 579 #else
 580 static void __init reserve_crashkernel(void)
 581 {
 582 }
 583 #endif
 584
 585 static struct resource standard_io_resources[] = {
 586         { .name = "dma1", .start = 0x00, .end = 0x1f,
 587                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 588         { .name = "pic1", .start = 0x20, .end = 0x21,
 589                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 590         { .name = "timer0", .start = 0x40, .end = 0x43,
 591                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 592         { .name = "timer1", .start = 0x50, .end = 0x53,
 593                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 594         { .name = "keyboard", .start = 0x60, .end = 0x60,
 595                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 596         { .name = "keyboard", .start = 0x64, .end = 0x64,
 597                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 598         { .name = "dma page reg", .start = 0x80, .end = 0x8f,
 599                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 600         { .name = "pic2", .start = 0xa0, .end = 0xa1,
 601                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 602         { .name = "dma2", .start = 0xc0, .end = 0xdf,
 603                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 604         { .name = "fpu", .start = 0xf0, .end = 0xff,
 605                 .flags = IORESOURCE_BUSY | IORESOURCE_IO }
 606 };
 607
 608 static void __init reserve_standard_io_resources(void)
 609 {
 610         int i;
 611
 612         /* request I/O space for devices used on all i[345]86 PCs */
 613         for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
 614                 request_resource(&ioport_resource, &standard_io_resources[i]);
 615
 616 }
 617
 618 /*
 619  * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
 620  * is_kdump_kernel() to determine if we are booting after a panic. Hence
 621  * ifdef it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
 622  */
 623
 624 #ifdef CONFIG_CRASH_DUMP
 625 /* elfcorehdr= specifies the location of elf core header
 626  * stored by the crashed kernel. This option will be passed
 627  * by kexec loader to the capture kernel.
 628  */
 629 static int __init setup_elfcorehdr(char *arg)
 630 {
 631         char *end;
 632         if (!arg)
 633                 return -EINVAL;
 634         elfcorehdr_addr = memparse(arg, &end);
 635         return end > arg ? 0 : -EINVAL;
 636 }
 637 early_param("elfcorehdr", setup_elfcorehdr);
 638 #endif
 639
 640 static struct x86_quirks default_x86_quirks __initdata;
 641
 642 struct x86_quirks *x86_quirks __initdata = &default_x86_quirks;
 643
 644 #ifdef CONFIG_X86_RESERVE_LOW_64K
 645 static int __init dmi_low_memory_corruption(const struct dmi_system_id *d)
 646 {
 647         printk(KERN_NOTICE
 648                 "%s detected: BIOS may corrupt low RAM, working around it.\n",
 649                 d->ident);
 650
 651         e820_update_range(0, 0x10000, E820_RAM, E820_RESERVED);
 652         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 653
 654         return 0;
 655 }
 656 #endif
 657
 658 /* List of systems that have known low memory corruption BIOS problems */
 659 static struct dmi_system_id __initdata bad_bios_dmi_table[] = {
 660 #ifdef CONFIG_X86_RESERVE_LOW_64K
 661         {
 662                 .callback = dmi_low_memory_corruption,
 663                 .ident = "AMI BIOS",
 664                 .matches = {
 665                         DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
 666                 },
 667         },
 668         {
 669                 .callback = dmi_low_memory_corruption,
 670                 .ident = "Phoenix BIOS",
 671                 .matches = {
 672                         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies"),
 673                 },
 674         },
 675 #endif
 676         {}
 677 };
 678
 679 /*
 680  * Determine if we were loaded by an EFI loader.  If so, then we have also been
 681  * passed the efi memmap, systab, etc., so we should use these data structures
 682  * for initialization.  Note, the efi init code path is determined by the
 683  * global efi_enabled. This allows the same kernel image to be used on existing
 684  * systems (with a traditional BIOS) as well as on EFI systems.
 685  */
 686 /*
 687  * setup_arch - architecture-specific boot-time initializations
 688  *
 689  * Note: On x86_64, fixmaps are ready for use even before this is called.
 690  */
 691
 692 void __init setup_arch(char **cmdline_p)
 693 {
 694 #ifdef CONFIG_X86_32
 695         memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
 696         visws_early_detect();
 697 #else
 698         printk(KERN_INFO "Command line: %s\n", boot_command_line);
 699 #endif
 700
 701         /* VMI may relocate the fixmap; do this before touching ioremap area */
 702         vmi_init();
 703
 704         early_cpu_init();
 705         early_ioremap_init();
 706
 707         ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
 708         screen_info = boot_params.screen_info;
 709         edid_info = boot_params.edid_info;
 710 #ifdef CONFIG_X86_32
 711         apm_info.bios = boot_params.apm_bios_info;
 712         ist_info = boot_params.ist_info;
 713         if (boot_params.sys_desc_table.length != 0) {
 714                 set_mca_bus(boot_params.sys_desc_table.table[3] & 0x2);
 715                 machine_id = boot_params.sys_desc_table.table[0];
 716                 machine_submodel_id = boot_params.sys_desc_table.table[1];
 717                 BIOS_revision = boot_params.sys_desc_table.table[2];
 718         }
 719 #endif
 720         saved_video_mode = boot_params.hdr.vid_mode;
 721         bootloader_type = boot_params.hdr.type_of_loader;
 722         if ((bootloader_type >> 4) == 0xe) {
 723                 bootloader_type &= 0xf;
 724                 bootloader_type |= (boot_params.hdr.ext_loader_type+0x10) << 4;
 725         }
 726         bootloader_version  = bootloader_type & 0xf;
 727         bootloader_version |= boot_params.hdr.ext_loader_ver << 4;
 728
 729 #ifdef CONFIG_BLK_DEV_RAM
 730         rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
 731         rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
 732         rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
 733 #endif
 734 #ifdef CONFIG_EFI
 735         if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
 736 #ifdef CONFIG_X86_32
 737                      "EL32",
 738 #else
 739                      "EL64",
 740 #endif
 741          4)) {
 742                 efi_enabled = 1;
 743                 efi_reserve_early();
 744         }
 745 #endif
 746
 747         ARCH_SETUP
 748
 749         setup_memory_map();
 750         parse_setup_data();
 751         /* update the e820_saved too */
 752         e820_reserve_setup_data();
 753
 754         copy_edd();
 755
 756         if (!boot_params.hdr.root_flags)
 757                 root_mountflags &= ~MS_RDONLY;
 758         init_mm.start_code = (unsigned long) _text;
 759         init_mm.end_code = (unsigned long) _etext;
 760         init_mm.end_data = (unsigned long) _edata;
 761         init_mm.brk = _brk_end;
 762
 763         code_resource.start = virt_to_phys(_text);
 764         code_resource.end = virt_to_phys(_etext)-1;
 765         data_resource.start = virt_to_phys(_etext);
 766         data_resource.end = virt_to_phys(_edata)-1;
 767         bss_resource.start = virt_to_phys(&__bss_start);
 768         bss_resource.end = virt_to_phys(&__bss_stop)-1;
 769
 770 #ifdef CONFIG_CMDLINE_BOOL
 771 #ifdef CONFIG_CMDLINE_OVERRIDE
 772         strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 773 #else
 774         if (builtin_cmdline[0]) {
 775                 /* append boot loader cmdline to builtin */
 776                 strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE);
 777                 strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE);
 778                 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 779         }
 780 #endif
 781 #endif
 782
 783         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 784         *cmdline_p = command_line;
 785
 786         parse_early_param();
 787
 788 #ifdef CONFIG_X86_64
 789         check_efer();
 790 #endif
 791
 792         /* Must be before kernel pagetables are setup */
 793         vmi_activate();
 794
 795         /* after early param, so could get panic from serial */
 796         reserve_early_setup_data();
 797
 798         if (acpi_mps_check()) {
 799 #ifdef CONFIG_X86_LOCAL_APIC
 800                 disable_apic = 1;
 801 #endif
 802                 setup_clear_cpu_cap(X86_FEATURE_APIC);
 803         }
 804
 805 #ifdef CONFIG_PCI
 806         if (pci_early_dump_regs)
 807                 early_dump_pci_devices();
 808 #endif
 809
 810         finish_e820_parsing();
 811
 812         if (efi_enabled)
 813                 efi_init();
 814
 815         dmi_scan_machine();
 816
 817         dmi_check_system(bad_bios_dmi_table);
 818
 819         /*
 820          * VMware detection requires dmi to be available, so this
 821          * needs to be done after dmi_scan_machine, for the BP.
 822          */
 823         init_hypervisor(&boot_cpu_data);
 824
 825 #ifdef CONFIG_X86_32
 826         probe_roms();
 827 #endif
 828
 829         /* after parse_early_param, so could debug it */
 830         insert_resource(&iomem_resource, &code_resource);
 831         insert_resource(&iomem_resource, &data_resource);
 832         insert_resource(&iomem_resource, &bss_resource);
 833
 834
 835 #ifdef CONFIG_X86_32
 836         if (ppro_with_ram_bug()) {
 837                 e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM,
 838                                   E820_RESERVED);
 839                 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 840                 printk(KERN_INFO "fixed physical RAM map:\n");
 841                 e820_print_map("bad_ppro");
 842         }
 843 #else
 844         early_gart_iommu_check();
 845 #endif
 846
 847         /*
 848          * partially used pages are not usable - thus
 849          * we are rounding upwards:
 850          */
 851         max_pfn = e820_end_of_ram_pfn();
 852
 853         /* preallocate 4k for mptable mpc */
 854         early_reserve_e820_mpc_new();
 855         /* update e820 for memory not covered by WB MTRRs */
 856         mtrr_bp_init();
 857         if (mtrr_trim_uncached_memory(max_pfn))
 858                 max_pfn = e820_end_of_ram_pfn();
 859
 860 #ifdef CONFIG_X86_32
 861         /* max_low_pfn get updated here */
 862         find_low_pfn_range();
 863 #else
 864         num_physpages = max_pfn;
 865
 866         check_x2apic();
 867
 868         /* How many end-of-memory variables you have, grandma! */
 869         /* need this before calling reserve_initrd */
 870         if (max_pfn > (1UL<<(32 - PAGE_SHIFT)))
 871                 max_low_pfn = e820_end_of_low_ram_pfn();
 872         else
 873                 max_low_pfn = max_pfn;
 874
 875         high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
 876         max_pfn_mapped = KERNEL_IMAGE_SIZE >> PAGE_SHIFT;
 877 #endif
 878
 879 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
 880         setup_bios_corruption_check();
 881 #endif
 882
 883         printk(KERN_DEBUG "initial memory mapped : 0 - %08lx\n",
 884                         max_pfn_mapped<<PAGE_SHIFT);
 885
 886         reserve_brk();
 887
 888         init_gbpages();
 889
 890         /* max_pfn_mapped is updated here */
 891         max_low_pfn_mapped = init_memory_mapping(0, max_low_pfn<<PAGE_SHIFT);
 892         max_pfn_mapped = max_low_pfn_mapped;
 893
 894 #ifdef CONFIG_X86_64
 895         if (max_pfn > max_low_pfn) {
 896                 max_pfn_mapped = init_memory_mapping(1UL<<32,
 897                                                      max_pfn<<PAGE_SHIFT);
 898                 /* can we preseve max_low_pfn ?*/
 899                 max_low_pfn = max_pfn;
 900         }
 901 #endif
 902
 903         /*
 904          * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
 905          */
 906
 907 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
 908         if (init_ohci1394_dma_early)
 909                 init_ohci1394_dma_on_all_controllers();
 910 #endif
 911
 912         reserve_initrd();
 913
 914         vsmp_init();
 915
 916         io_delay_init();
 917
 918         /*
 919          * Parse the ACPI tables for possible boot-time SMP configuration.
 920          */
 921         acpi_boot_table_init();
 922
 923         early_acpi_boot_init();
 924
 925 #ifdef CONFIG_ACPI_NUMA
 926         /*
 927          * Parse SRAT to discover nodes.
 928          */
 929         acpi_numa_init();
 930 #endif
 931
 932         initmem_init(0, max_pfn);
 933
 934 #ifdef CONFIG_ACPI_SLEEP
 935         /*
 936          * Reserve low memory region for sleep support.
 937          */
 938         acpi_reserve_bootmem();
 939 #endif
 940         /*
 941          * Find and reserve possible boot-time SMP configuration:
 942          */
 943         find_smp_config();
 944
 945         reserve_crashkernel();
 946
 947 #ifdef CONFIG_X86_64
 948         /*
 949          * dma32_reserve_bootmem() allocates bootmem which may conflict
 950          * with the crashkernel command line, so do that after
 951          * reserve_crashkernel()
 952          */
 953         dma32_reserve_bootmem();
 954 #endif
 955
 956         reserve_ibft_region();
 957
 958 #ifdef CONFIG_KVM_CLOCK
 959         kvmclock_init();
 960 #endif
 961
 962         paravirt_pagetable_setup_start(swapper_pg_dir);
 963         paging_init();
 964         paravirt_pagetable_setup_done(swapper_pg_dir);
 965         paravirt_post_allocator_init();
 966
 967 #ifdef CONFIG_X86_64
 968         map_vsyscall();
 969 #endif
 970
 971         generic_apic_probe();
 972
 973         early_quirks();
 974
 975         /*
 976          * Read APIC and some other early information from ACPI tables.
 977          */
 978         acpi_boot_init();
 979
 980 #if defined(CONFIG_X86_MPPARSE) || defined(CONFIG_X86_VISWS)
 981         /*
 982          * get boot-time SMP configuration:
 983          */
 984         if (smp_found_config)
 985                 get_smp_config();
 986 #endif
 987
 988         prefill_possible_map();
 989
 990 #ifdef CONFIG_X86_64
 991         init_cpu_to_node();
 992 #endif
 993
 994         init_apic_mappings();
 995         ioapic_init_mappings();
 996
 997         /* need to wait for io_apic is mapped */
 998         probe_nr_irqs_gsi();
 999
1000         kvm_guest_init();
1001
1002         e820_reserve_resources();
1003         e820_mark_nosave_regions(max_low_pfn);
1004
1005 #ifdef CONFIG_X86_32
1006         request_resource(&iomem_resource, &video_ram_resource);
1007 #endif
1008         reserve_standard_io_resources();
1009
1010         e820_setup_gap();
1011
1012 #ifdef CONFIG_VT
1013 #if defined(CONFIG_VGA_CONSOLE)
1014         if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
1015                 conswitchp = &vga_con;
1016 #elif defined(CONFIG_DUMMY_CONSOLE)
1017         conswitchp = &dummy_con;
1018 #endif
1019 #endif
1020 }
1021
1022 #ifdef CONFIG_X86_32
1023
1024 /**
1025  * x86_quirk_intr_init - post gate setup interrupt initialisation
1026  *
1027  * Description:
1028  *      Fill in any interrupts that may have been left out by the general
1029  *      init_IRQ() routine.  interrupts having to do with the machine rather
1030  *      than the devices on the I/O bus (like APIC interrupts in intel MP
1031  *      systems) are started here.
1032  **/
1033 void __init x86_quirk_intr_init(void)
1034 {
1035         if (x86_quirks->arch_intr_init) {
1036                 if (x86_quirks->arch_intr_init())
1037                         return;
1038         }
1039 }
1040
1041 /**
1042  * x86_quirk_trap_init - initialise system specific traps
1043  *
1044  * Description:
1045  *      Called as the final act of trap_init().  Used in VISWS to initialise
1046  *      the various board specific APIC traps.
1047  **/
1048 void __init x86_quirk_trap_init(void)
1049 {
1050         if (x86_quirks->arch_trap_init) {
1051                 if (x86_quirks->arch_trap_init())
1052                         return;
1053         }
1054 }
1055
1056 static struct irqaction irq0  = {
1057         .handler = timer_interrupt,
1058         .flags = IRQF_DISABLED | IRQF_NOBALANCING | IRQF_IRQPOLL | IRQF_TIMER,
1059         .name = "timer"
1060 };
1061
1062 /**
1063  * x86_quirk_pre_time_init - do any specific initialisations before.
1064  *
1065  **/
1066 void __init x86_quirk_pre_time_init(void)
1067 {
1068         if (x86_quirks->arch_pre_time_init)
1069                 x86_quirks->arch_pre_time_init();
1070 }
1071
1072 /**
1073  * x86_quirk_time_init - do any specific initialisations for the system timer.
1074  *
1075  * Description:
1076  *      Must plug the system timer interrupt source at HZ into the IRQ listed
1077  *      in irq_vectors.h:TIMER_IRQ
1078  **/
1079 void __init x86_quirk_time_init(void)
1080 {
1081         if (x86_quirks->arch_time_init) {
1082                 /*
1083                  * A nonzero return code does not mean failure, it means
1084                  * that the architecture quirk does not want any
1085                  * generic (timer) setup to be performed after this:
1086                  */
1087                 if (x86_quirks->arch_time_init())
1088                         return;
1089         }
1090
1091         irq0.mask = cpumask_of_cpu(0);
1092         setup_irq(0, &irq0);
1093 }
1094 #endif /* CONFIG_X86_32 */