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/sfi.h>
  31 #include <linux/apm_bios.h>
  32 #include <linux/initrd.h>
  33 #include <linux/bootmem.h>
  34 #include <linux/seq_file.h>
  35 #include <linux/console.h>
  36 #include <linux/mca.h>
  37 #include <linux/root_dev.h>
  38 #include <linux/highmem.h>
  39 #include <linux/module.h>
  40 #include <linux/efi.h>
  41 #include <linux/init.h>
  42 #include <linux/edd.h>
  43 #include <linux/iscsi_ibft.h>
  44 #include <linux/nodemask.h>
  45 #include <linux/kexec.h>
  46 #include <linux/dmi.h>
  47 #include <linux/pfn.h>
  48 #include <linux/pci.h>
  49 #include <asm/pci-direct.h>
  50 #include <linux/init_ohci1394_dma.h>
  51 #include <linux/kvm_para.h>
  52
  53 #include <linux/errno.h>
  54 #include <linux/kernel.h>
  55 #include <linux/stddef.h>
  56 #include <linux/unistd.h>
  57 #include <linux/ptrace.h>
  58 #include <linux/slab.h>
  59 #include <linux/user.h>
  60 #include <linux/delay.h>
  61
  62 #include <linux/kallsyms.h>
  63 #include <linux/cpufreq.h>
  64 #include <linux/dma-mapping.h>
  65 #include <linux/ctype.h>
  66 #include <linux/uaccess.h>
  67
  68 #include <linux/percpu.h>
  69 #include <linux/crash_dump.h>
  70 #include <linux/tboot.h>
  71
  72 #include <video/edid.h>
  73
  74 #include <asm/mtrr.h>
  75 #include <asm/apic.h>
  76 #include <asm/trampoline.h>
  77 #include <asm/e820.h>
  78 #include <asm/mpspec.h>
  79 #include <asm/setup.h>
  80 #include <asm/efi.h>
  81 #include <asm/timer.h>
  82 #include <asm/i8259.h>
  83 #include <asm/sections.h>
  84 #include <asm/dmi.h>
  85 #include <asm/io_apic.h>
  86 #include <asm/ist.h>
  87 #include <asm/vmi.h>
  88 #include <asm/setup_arch.h>
  89 #include <asm/bios_ebda.h>
  90 #include <asm/cacheflush.h>
  91 #include <asm/processor.h>
  92 #include <asm/bugs.h>
  93
  94 #include <asm/system.h>
  95 #include <asm/vsyscall.h>
  96 #include <asm/cpu.h>
  97 #include <asm/desc.h>
  98 #include <asm/dma.h>
  99 #include <asm/iommu.h>
 100 #include <asm/gart.h>
 101 #include <asm/mmu_context.h>
 102 #include <asm/proto.h>
 103
 104 #include <asm/paravirt.h>
 105 #include <asm/hypervisor.h>
 106
 107 #include <asm/percpu.h>
 108 #include <asm/topology.h>
 109 #include <asm/apicdef.h>
 110 #include <asm/k8.h>
 111 #ifdef CONFIG_X86_64
 112 #include <asm/numa_64.h>
 113 #endif
 114 #include <asm/mce.h>
 115
 116 /*
 117  * end_pfn only includes RAM, while max_pfn_mapped includes all e820 entries.
 118  * The direct mapping extends to max_pfn_mapped, so that we can directly access
 119  * apertures, ACPI and other tables without having to play with fixmaps.
 120  */
 121 unsigned long max_low_pfn_mapped;
 122 unsigned long max_pfn_mapped;
 123
 124 RESERVE_BRK(dmi_alloc, 65536);
 125
 126 unsigned int boot_cpu_id __read_mostly;
 127
 128 static __initdata unsigned long _brk_start = (unsigned long)__brk_base;
 129 unsigned long _brk_end = (unsigned long)__brk_base;
 130
 131 #ifdef CONFIG_X86_64
 132 int default_cpu_present_to_apicid(int mps_cpu)
 133 {
 134         return __default_cpu_present_to_apicid(mps_cpu);
 135 }
 136
 137 int default_check_phys_apicid_present(int phys_apicid)
 138 {
 139         return __default_check_phys_apicid_present(phys_apicid);
 140 }
 141 #endif
 142
 143 #ifndef CONFIG_DEBUG_BOOT_PARAMS
 144 struct boot_params __initdata boot_params;
 145 #else
 146 struct boot_params boot_params;
 147 #endif
 148
 149 /*
 150  * Machine setup..
 151  */
 152 static struct resource data_resource = {
 153         .name   = "Kernel data",
 154         .start  = 0,
 155         .end    = 0,
 156         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 157 };
 158
 159 static struct resource code_resource = {
 160         .name   = "Kernel code",
 161         .start  = 0,
 162         .end    = 0,
 163         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 164 };
 165
 166 static struct resource bss_resource = {
 167         .name   = "Kernel bss",
 168         .start  = 0,
 169         .end    = 0,
 170         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 171 };
 172
 173
 174 #ifdef CONFIG_X86_32
 175 /* cpu data as detected by the assembly code in head.S */
 176 struct cpuinfo_x86 new_cpu_data __cpuinitdata = {0, 0, 0, 0, -1, 1, 0, 0, -1};
 177 /* common cpu data for all cpus */
 178 struct cpuinfo_x86 boot_cpu_data __read_mostly = {0, 0, 0, 0, -1, 1, 0, 0, -1};
 179 EXPORT_SYMBOL(boot_cpu_data);
 180 static void set_mca_bus(int x)
 181 {
 182 #ifdef CONFIG_MCA
 183         MCA_bus = x;
 184 #endif
 185 }
 186
 187 unsigned int def_to_bigsmp;
 188
 189 /* for MCA, but anyone else can use it if they want */
 190 unsigned int machine_id;
 191 unsigned int machine_submodel_id;
 192 unsigned int BIOS_revision;
 193
 194 struct apm_info apm_info;
 195 EXPORT_SYMBOL(apm_info);
 196
 197 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
 198         defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
 199 struct ist_info ist_info;
 200 EXPORT_SYMBOL(ist_info);
 201 #else
 202 struct ist_info ist_info;
 203 #endif
 204
 205 #else
 206 struct cpuinfo_x86 boot_cpu_data __read_mostly = {
 207         .x86_phys_bits = MAX_PHYSMEM_BITS,
 208 };
 209 EXPORT_SYMBOL(boot_cpu_data);
 210 #endif
 211
 212
 213 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
 214 unsigned long mmu_cr4_features;
 215 #else
 216 unsigned long mmu_cr4_features = X86_CR4_PAE;
 217 #endif
 218
 219 /* Boot loader ID and version as integers, for the benefit of proc_dointvec */
 220 int bootloader_type, bootloader_version;
 221
 222 /*
 223  * Setup options
 224  */
 225 struct screen_info screen_info;
 226 EXPORT_SYMBOL(screen_info);
 227 struct edid_info edid_info;
 228 EXPORT_SYMBOL_GPL(edid_info);
 229
 230 extern int root_mountflags;
 231
 232 unsigned long saved_video_mode;
 233
 234 #define RAMDISK_IMAGE_START_MASK        0x07FF
 235 #define RAMDISK_PROMPT_FLAG             0x8000
 236 #define RAMDISK_LOAD_FLAG               0x4000
 237
 238 static char __initdata command_line[COMMAND_LINE_SIZE];
 239 #ifdef CONFIG_CMDLINE_BOOL
 240 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
 241 #endif
 242
 243 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
 244 struct edd edd;
 245 #ifdef CONFIG_EDD_MODULE
 246 EXPORT_SYMBOL(edd);
 247 #endif
 248 /**
 249  * copy_edd() - Copy the BIOS EDD information
 250  *              from boot_params into a safe place.
 251  *
 252  */
 253 static inline void __init copy_edd(void)
 254 {
 255      memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
 256             sizeof(edd.mbr_signature));
 257      memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
 258      edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
 259      edd.edd_info_nr = boot_params.eddbuf_entries;
 260 }
 261 #else
 262 static inline void __init copy_edd(void)
 263 {
 264 }
 265 #endif
 266
 267 void * __init extend_brk(size_t size, size_t align)
 268 {
 269         size_t mask = align - 1;
 270         void *ret;
 271
 272         BUG_ON(_brk_start == 0);
 273         BUG_ON(align & mask);
 274
 275         _brk_end = (_brk_end + mask) & ~mask;
 276         BUG_ON((char *)(_brk_end + size) > __brk_limit);
 277
 278         ret = (void *)_brk_end;
 279         _brk_end += size;
 280
 281         memset(ret, 0, size);
 282
 283         return ret;
 284 }
 285
 286 #ifdef CONFIG_X86_64
 287 static void __init init_gbpages(void)
 288 {
 289         if (direct_gbpages && cpu_has_gbpages)
 290                 printk(KERN_INFO "Using GB pages for direct mapping\n");
 291         else
 292                 direct_gbpages = 0;
 293 }
 294 #else
 295 static inline void init_gbpages(void)
 296 {
 297 }
 298 #endif
 299
 300 static void __init reserve_brk(void)
 301 {
 302         if (_brk_end > _brk_start)
 303                 reserve_early(__pa(_brk_start), __pa(_brk_end), "BRK");
 304
 305         /* Mark brk area as locked down and no longer taking any
 306            new allocations */
 307         _brk_start = 0;
 308 }
 309
 310 #ifdef CONFIG_BLK_DEV_INITRD
 311
 312 #define MAX_MAP_CHUNK   (NR_FIX_BTMAPS << PAGE_SHIFT)
 313 static void __init relocate_initrd(void)
 314 {
 315
 316         u64 ramdisk_image = boot_params.hdr.ramdisk_image;
 317         u64 ramdisk_size  = boot_params.hdr.ramdisk_size;
 318         u64 end_of_lowmem = max_low_pfn_mapped << PAGE_SHIFT;
 319         u64 ramdisk_here;
 320         unsigned long slop, clen, mapaddr;
 321         char *p, *q;
 322
 323         /* We need to move the initrd down into lowmem */
 324         ramdisk_here = find_e820_area(0, end_of_lowmem, ramdisk_size,
 325                                          PAGE_SIZE);
 326
 327         if (ramdisk_here == -1ULL)
 328                 panic("Cannot find place for new RAMDISK of size %lld\n",
 329                          ramdisk_size);
 330
 331         /* Note: this includes all the lowmem currently occupied by
 332            the initrd, we rely on that fact to keep the data intact. */
 333         reserve_early(ramdisk_here, ramdisk_here + ramdisk_size,
 334                          "NEW RAMDISK");
 335         initrd_start = ramdisk_here + PAGE_OFFSET;
 336         initrd_end   = initrd_start + ramdisk_size;
 337         printk(KERN_INFO "Allocated new RAMDISK: %08llx - %08llx\n",
 338                          ramdisk_here, ramdisk_here + ramdisk_size);
 339
 340         q = (char *)initrd_start;
 341
 342         /* Copy any lowmem portion of the initrd */
 343         if (ramdisk_image < end_of_lowmem) {
 344                 clen = end_of_lowmem - ramdisk_image;
 345                 p = (char *)__va(ramdisk_image);
 346                 memcpy(q, p, clen);
 347                 q += clen;
 348                 ramdisk_image += clen;
 349                 ramdisk_size  -= clen;
 350         }
 351
 352         /* Copy the highmem portion of the initrd */
 353         while (ramdisk_size) {
 354                 slop = ramdisk_image & ~PAGE_MASK;
 355                 clen = ramdisk_size;
 356                 if (clen > MAX_MAP_CHUNK-slop)
 357                         clen = MAX_MAP_CHUNK-slop;
 358                 mapaddr = ramdisk_image & PAGE_MASK;
 359                 p = early_memremap(mapaddr, clen+slop);
 360                 memcpy(q, p+slop, clen);
 361                 early_iounmap(p, clen+slop);
 362                 q += clen;
 363                 ramdisk_image += clen;
 364                 ramdisk_size  -= clen;
 365         }
 366         /* high pages is not converted by early_res_to_bootmem */
 367         ramdisk_image = boot_params.hdr.ramdisk_image;
 368         ramdisk_size  = boot_params.hdr.ramdisk_size;
 369         printk(KERN_INFO "Move RAMDISK from %016llx - %016llx to"
 370                 " %08llx - %08llx\n",
 371                 ramdisk_image, ramdisk_image + ramdisk_size - 1,
 372                 ramdisk_here, ramdisk_here + ramdisk_size - 1);
 373 }
 374
 375 static void __init reserve_initrd(void)
 376 {
 377         u64 ramdisk_image = boot_params.hdr.ramdisk_image;
 378         u64 ramdisk_size  = boot_params.hdr.ramdisk_size;
 379         u64 ramdisk_end   = ramdisk_image + ramdisk_size;
 380         u64 end_of_lowmem = max_low_pfn_mapped << PAGE_SHIFT;
 381
 382         if (!boot_params.hdr.type_of_loader ||
 383             !ramdisk_image || !ramdisk_size)
 384                 return;         /* No initrd provided by bootloader */
 385
 386         initrd_start = 0;
 387
 388         if (ramdisk_size >= (end_of_lowmem>>1)) {
 389                 free_early(ramdisk_image, ramdisk_end);
 390                 printk(KERN_ERR "initrd too large to handle, "
 391                        "disabling initrd\n");
 392                 return;
 393         }
 394
 395         printk(KERN_INFO "RAMDISK: %08llx - %08llx\n", ramdisk_image,
 396                         ramdisk_end);
 397
 398
 399         if (ramdisk_end <= end_of_lowmem) {
 400                 /* All in lowmem, easy case */
 401                 /*
 402                  * don't need to reserve again, already reserved early
 403                  * in i386_start_kernel
 404                  */
 405                 initrd_start = ramdisk_image + PAGE_OFFSET;
 406                 initrd_end = initrd_start + ramdisk_size;
 407                 return;
 408         }
 409
 410         relocate_initrd();
 411
 412         free_early(ramdisk_image, ramdisk_end);
 413 }
 414 #else
 415 static void __init reserve_initrd(void)
 416 {
 417 }
 418 #endif /* CONFIG_BLK_DEV_INITRD */
 419
 420 static void __init parse_setup_data(void)
 421 {
 422         struct setup_data *data;
 423         u64 pa_data;
 424
 425         if (boot_params.hdr.version < 0x0209)
 426                 return;
 427         pa_data = boot_params.hdr.setup_data;
 428         while (pa_data) {
 429                 data = early_memremap(pa_data, PAGE_SIZE);
 430                 switch (data->type) {
 431                 case SETUP_E820_EXT:
 432                         parse_e820_ext(data, pa_data);
 433                         break;
 434                 default:
 435                         break;
 436                 }
 437                 pa_data = data->next;
 438                 early_iounmap(data, PAGE_SIZE);
 439         }
 440 }
 441
 442 static void __init e820_reserve_setup_data(void)
 443 {
 444         struct setup_data *data;
 445         u64 pa_data;
 446         int found = 0;
 447
 448         if (boot_params.hdr.version < 0x0209)
 449                 return;
 450         pa_data = boot_params.hdr.setup_data;
 451         while (pa_data) {
 452                 data = early_memremap(pa_data, sizeof(*data));
 453                 e820_update_range(pa_data, sizeof(*data)+data->len,
 454                          E820_RAM, E820_RESERVED_KERN);
 455                 found = 1;
 456                 pa_data = data->next;
 457                 early_iounmap(data, sizeof(*data));
 458         }
 459         if (!found)
 460                 return;
 461
 462         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 463         memcpy(&e820_saved, &e820, sizeof(struct e820map));
 464         printk(KERN_INFO "extended physical RAM map:\n");
 465         e820_print_map("reserve setup_data");
 466 }
 467
 468 static void __init reserve_early_setup_data(void)
 469 {
 470         struct setup_data *data;
 471         u64 pa_data;
 472         char buf[32];
 473
 474         if (boot_params.hdr.version < 0x0209)
 475                 return;
 476         pa_data = boot_params.hdr.setup_data;
 477         while (pa_data) {
 478                 data = early_memremap(pa_data, sizeof(*data));
 479                 sprintf(buf, "setup data %x", data->type);
 480                 reserve_early(pa_data, pa_data+sizeof(*data)+data->len, buf);
 481                 pa_data = data->next;
 482                 early_iounmap(data, sizeof(*data));
 483         }
 484 }
 485
 486 /*
 487  * --------- Crashkernel reservation ------------------------------
 488  */
 489
 490 #ifdef CONFIG_KEXEC
 491
 492 static inline unsigned long long get_total_mem(void)
 493 {
 494         unsigned long long total;
 495
 496         total = max_pfn - min_low_pfn;
 497
 498         return total << PAGE_SHIFT;
 499 }
 500
 501 static void __init reserve_crashkernel(void)
 502 {
 503         unsigned long long total_mem;
 504         unsigned long long crash_size, crash_base;
 505         int ret;
 506
 507         total_mem = get_total_mem();
 508
 509         ret = parse_crashkernel(boot_command_line, total_mem,
 510                         &crash_size, &crash_base);
 511         if (ret != 0 || crash_size <= 0)
 512                 return;
 513
 514         /* 0 means: find the address automatically */
 515         if (crash_base <= 0) {
 516                 const unsigned long long alignment = 16<<20;    /* 16M */
 517
 518                 crash_base = find_e820_area(alignment, ULONG_MAX, crash_size,
 519                                  alignment);
 520                 if (crash_base == -1ULL) {
 521                         pr_info("crashkernel reservation failed - No suitable area found.\n");
 522                         return;
 523                 }
 524         } else {
 525                 unsigned long long start;
 526
 527                 start = find_e820_area(crash_base, ULONG_MAX, crash_size,
 528                                  1<<20);
 529                 if (start != crash_base) {
 530                         pr_info("crashkernel reservation failed - memory is in use.\n");
 531                         return;
 532                 }
 533         }
 534         reserve_early(crash_base, crash_base + crash_size, "CRASH KERNEL");
 535
 536         printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
 537                         "for crashkernel (System RAM: %ldMB)\n",
 538                         (unsigned long)(crash_size >> 20),
 539                         (unsigned long)(crash_base >> 20),
 540                         (unsigned long)(total_mem >> 20));
 541
 542         crashk_res.start = crash_base;
 543         crashk_res.end   = crash_base + crash_size - 1;
 544         insert_resource(&iomem_resource, &crashk_res);
 545 }
 546 #else
 547 static void __init reserve_crashkernel(void)
 548 {
 549 }
 550 #endif
 551
 552 static struct resource standard_io_resources[] = {
 553         { .name = "dma1", .start = 0x00, .end = 0x1f,
 554                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 555         { .name = "pic1", .start = 0x20, .end = 0x21,
 556                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 557         { .name = "timer0", .start = 0x40, .end = 0x43,
 558                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 559         { .name = "timer1", .start = 0x50, .end = 0x53,
 560                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 561         { .name = "keyboard", .start = 0x60, .end = 0x60,
 562                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 563         { .name = "keyboard", .start = 0x64, .end = 0x64,
 564                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 565         { .name = "dma page reg", .start = 0x80, .end = 0x8f,
 566                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 567         { .name = "pic2", .start = 0xa0, .end = 0xa1,
 568                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 569         { .name = "dma2", .start = 0xc0, .end = 0xdf,
 570                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 571         { .name = "fpu", .start = 0xf0, .end = 0xff,
 572                 .flags = IORESOURCE_BUSY | IORESOURCE_IO }
 573 };
 574
 575 void __init reserve_standard_io_resources(void)
 576 {
 577         int i;
 578
 579         /* request I/O space for devices used on all i[345]86 PCs */
 580         for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
 581                 request_resource(&ioport_resource, &standard_io_resources[i]);
 582
 583 }
 584
 585 /*
 586  * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
 587  * is_kdump_kernel() to determine if we are booting after a panic. Hence
 588  * ifdef it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
 589  */
 590
 591 #ifdef CONFIG_CRASH_DUMP
 592 /* elfcorehdr= specifies the location of elf core header
 593  * stored by the crashed kernel. This option will be passed
 594  * by kexec loader to the capture kernel.
 595  */
 596 static int __init setup_elfcorehdr(char *arg)
 597 {
 598         char *end;
 599         if (!arg)
 600                 return -EINVAL;
 601         elfcorehdr_addr = memparse(arg, &end);
 602         return end > arg ? 0 : -EINVAL;
 603 }
 604 early_param("elfcorehdr", setup_elfcorehdr);
 605 #endif
 606
 607 #ifdef CONFIG_X86_RESERVE_LOW_64K
 608 static int __init dmi_low_memory_corruption(const struct dmi_system_id *d)
 609 {
 610         printk(KERN_NOTICE
 611                 "%s detected: BIOS may corrupt low RAM, working around it.\n",
 612                 d->ident);
 613
 614         e820_update_range(0, 0x10000, E820_RAM, E820_RESERVED);
 615         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 616
 617         return 0;
 618 }
 619 #endif
 620
 621 /* List of systems that have known low memory corruption BIOS problems */
 622 static struct dmi_system_id __initdata bad_bios_dmi_table[] = {
 623 #ifdef CONFIG_X86_RESERVE_LOW_64K
 624         {
 625                 .callback = dmi_low_memory_corruption,
 626                 .ident = "AMI BIOS",
 627                 .matches = {
 628                         DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
 629                 },
 630         },
 631         {
 632                 .callback = dmi_low_memory_corruption,
 633                 .ident = "Phoenix BIOS",
 634                 .matches = {
 635                         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies"),
 636                 },
 637         },
 638         {
 639                 .callback = dmi_low_memory_corruption,
 640                 .ident = "Phoenix/MSC BIOS",
 641                 .matches = {
 642                         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix/MSC"),
 643                 },
 644         },
 645         {
 646         /*
 647          * AMI BIOS with low memory corruption was found on Intel DG45ID board.
 648          * It hase different DMI_BIOS_VENDOR = "Intel Corp.", for now we will
 649          * match only DMI_BOARD_NAME and see if there is more bad products
 650          * with this vendor.
 651          */
 652                 .callback = dmi_low_memory_corruption,
 653                 .ident = "AMI BIOS",
 654                 .matches = {
 655                         DMI_MATCH(DMI_BOARD_NAME, "DG45ID"),
 656                 },
 657         },
 658 #endif
 659         {}
 660 };
 661
 662 /*
 663  * Determine if we were loaded by an EFI loader.  If so, then we have also been
 664  * passed the efi memmap, systab, etc., so we should use these data structures
 665  * for initialization.  Note, the efi init code path is determined by the
 666  * global efi_enabled. This allows the same kernel image to be used on existing
 667  * systems (with a traditional BIOS) as well as on EFI systems.
 668  */
 669 /*
 670  * setup_arch - architecture-specific boot-time initializations
 671  *
 672  * Note: On x86_64, fixmaps are ready for use even before this is called.
 673  */
 674
 675 void __init setup_arch(char **cmdline_p)
 676 {
 677         int acpi = 0;
 678         int k8 = 0;
 679
 680 #ifdef CONFIG_X86_32
 681         memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
 682         visws_early_detect();
 683 #else
 684         printk(KERN_INFO "Command line: %s\n", boot_command_line);
 685 #endif
 686
 687         /* VMI may relocate the fixmap; do this before touching ioremap area */
 688         vmi_init();
 689
 690         early_cpu_init();
 691         early_ioremap_init();
 692
 693         ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
 694         screen_info = boot_params.screen_info;
 695         edid_info = boot_params.edid_info;
 696 #ifdef CONFIG_X86_32
 697         apm_info.bios = boot_params.apm_bios_info;
 698         ist_info = boot_params.ist_info;
 699         if (boot_params.sys_desc_table.length != 0) {
 700                 set_mca_bus(boot_params.sys_desc_table.table[3] & 0x2);
 701                 machine_id = boot_params.sys_desc_table.table[0];
 702                 machine_submodel_id = boot_params.sys_desc_table.table[1];
 703                 BIOS_revision = boot_params.sys_desc_table.table[2];
 704         }
 705 #endif
 706         saved_video_mode = boot_params.hdr.vid_mode;
 707         bootloader_type = boot_params.hdr.type_of_loader;
 708         if ((bootloader_type >> 4) == 0xe) {
 709                 bootloader_type &= 0xf;
 710                 bootloader_type |= (boot_params.hdr.ext_loader_type+0x10) << 4;
 711         }
 712         bootloader_version  = bootloader_type & 0xf;
 713         bootloader_version |= boot_params.hdr.ext_loader_ver << 4;
 714
 715 #ifdef CONFIG_BLK_DEV_RAM
 716         rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
 717         rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
 718         rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
 719 #endif
 720 #ifdef CONFIG_EFI
 721         if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
 722 #ifdef CONFIG_X86_32
 723                      "EL32",
 724 #else
 725                      "EL64",
 726 #endif
 727          4)) {
 728                 efi_enabled = 1;
 729                 efi_reserve_early();
 730         }
 731 #endif
 732
 733         x86_init.oem.arch_setup();
 734
 735         setup_memory_map();
 736         parse_setup_data();
 737         /* update the e820_saved too */
 738         e820_reserve_setup_data();
 739
 740         copy_edd();
 741
 742         if (!boot_params.hdr.root_flags)
 743                 root_mountflags &= ~MS_RDONLY;
 744         init_mm.start_code = (unsigned long) _text;
 745         init_mm.end_code = (unsigned long) _etext;
 746         init_mm.end_data = (unsigned long) _edata;
 747         init_mm.brk = _brk_end;
 748
 749         code_resource.start = virt_to_phys(_text);
 750         code_resource.end = virt_to_phys(_etext)-1;
 751         data_resource.start = virt_to_phys(_etext);
 752         data_resource.end = virt_to_phys(_edata)-1;
 753         bss_resource.start = virt_to_phys(&__bss_start);
 754         bss_resource.end = virt_to_phys(&__bss_stop)-1;
 755
 756 #ifdef CONFIG_CMDLINE_BOOL
 757 #ifdef CONFIG_CMDLINE_OVERRIDE
 758         strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 759 #else
 760         if (builtin_cmdline[0]) {
 761                 /* append boot loader cmdline to builtin */
 762                 strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE);
 763                 strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE);
 764                 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 765         }
 766 #endif
 767 #endif
 768
 769         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 770         *cmdline_p = command_line;
 771
 772         /*
 773          * x86_configure_nx() is called before parse_early_param() to detect
 774          * whether hardware doesn't support NX (so that the early EHCI debug
 775          * console setup can safely call set_fixmap()). It may then be called
 776          * again from within noexec_setup() during parsing early parameters
 777          * to honor the respective command line option.
 778          */
 779         x86_configure_nx();
 780
 781         parse_early_param();
 782
 783         x86_report_nx();
 784
 785         /* Must be before kernel pagetables are setup */
 786         vmi_activate();
 787
 788         /* after early param, so could get panic from serial */
 789         reserve_early_setup_data();
 790
 791         if (acpi_mps_check()) {
 792 #ifdef CONFIG_X86_LOCAL_APIC
 793                 disable_apic = 1;
 794 #endif
 795                 setup_clear_cpu_cap(X86_FEATURE_APIC);
 796         }
 797
 798 #ifdef CONFIG_PCI
 799         if (pci_early_dump_regs)
 800                 early_dump_pci_devices();
 801 #endif
 802
 803         finish_e820_parsing();
 804
 805         if (efi_enabled)
 806                 efi_init();
 807
 808         dmi_scan_machine();
 809
 810         dmi_check_system(bad_bios_dmi_table);
 811
 812         /*
 813          * VMware detection requires dmi to be available, so this
 814          * needs to be done after dmi_scan_machine, for the BP.
 815          */
 816         init_hypervisor_platform();
 817
 818         x86_init.resources.probe_roms();
 819
 820         /* after parse_early_param, so could debug it */
 821         insert_resource(&iomem_resource, &code_resource);
 822         insert_resource(&iomem_resource, &data_resource);
 823         insert_resource(&iomem_resource, &bss_resource);
 824
 825
 826 #ifdef CONFIG_X86_32
 827         if (ppro_with_ram_bug()) {
 828                 e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM,
 829                                   E820_RESERVED);
 830                 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 831                 printk(KERN_INFO "fixed physical RAM map:\n");
 832                 e820_print_map("bad_ppro");
 833         }
 834 #else
 835         early_gart_iommu_check();
 836 #endif
 837
 838         /*
 839          * partially used pages are not usable - thus
 840          * we are rounding upwards:
 841          */
 842         max_pfn = e820_end_of_ram_pfn();
 843
 844         /* preallocate 4k for mptable mpc */
 845         early_reserve_e820_mpc_new();
 846         /* update e820 for memory not covered by WB MTRRs */
 847         mtrr_bp_init();
 848         if (mtrr_trim_uncached_memory(max_pfn))
 849                 max_pfn = e820_end_of_ram_pfn();
 850
 851 #ifdef CONFIG_X86_32
 852         /* max_low_pfn get updated here */
 853         find_low_pfn_range();
 854 #else
 855         num_physpages = max_pfn;
 856
 857         check_x2apic();
 858
 859         /* How many end-of-memory variables you have, grandma! */
 860         /* need this before calling reserve_initrd */
 861         if (max_pfn > (1UL<<(32 - PAGE_SHIFT)))
 862                 max_low_pfn = e820_end_of_low_ram_pfn();
 863         else
 864                 max_low_pfn = max_pfn;
 865
 866         high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
 867         max_pfn_mapped = KERNEL_IMAGE_SIZE >> PAGE_SHIFT;
 868 #endif
 869
 870 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
 871         setup_bios_corruption_check();
 872 #endif
 873
 874         printk(KERN_DEBUG "initial memory mapped : 0 - %08lx\n",
 875                         max_pfn_mapped<<PAGE_SHIFT);
 876
 877         reserve_brk();
 878
 879         /*
 880          * Find and reserve possible boot-time SMP configuration:
 881          */
 882         find_smp_config();
 883
 884         reserve_trampoline_memory();
 885
 886 #ifdef CONFIG_ACPI_SLEEP
 887         /*
 888          * Reserve low memory region for sleep support.
 889          * even before init_memory_mapping
 890          */
 891         acpi_reserve_wakeup_memory();
 892 #endif
 893         init_gbpages();
 894
 895         /* max_pfn_mapped is updated here */
 896         max_low_pfn_mapped = init_memory_mapping(0, max_low_pfn<<PAGE_SHIFT);
 897         max_pfn_mapped = max_low_pfn_mapped;
 898
 899 #ifdef CONFIG_X86_64
 900         if (max_pfn > max_low_pfn) {
 901                 max_pfn_mapped = init_memory_mapping(1UL<<32,
 902                                                      max_pfn<<PAGE_SHIFT);
 903                 /* can we preseve max_low_pfn ?*/
 904                 max_low_pfn = max_pfn;
 905         }
 906 #endif
 907
 908         /*
 909          * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
 910          */
 911
 912 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
 913         if (init_ohci1394_dma_early)
 914                 init_ohci1394_dma_on_all_controllers();
 915 #endif
 916
 917         reserve_initrd();
 918
 919         reserve_crashkernel();
 920
 921         vsmp_init();
 922
 923         io_delay_init();
 924
 925         /*
 926          * Parse the ACPI tables for possible boot-time SMP configuration.
 927          */
 928         acpi_boot_table_init();
 929
 930         early_acpi_boot_init();
 931
 932 #ifdef CONFIG_ACPI_NUMA
 933         /*
 934          * Parse SRAT to discover nodes.
 935          */
 936         acpi = acpi_numa_init();
 937 #endif
 938
 939 #ifdef CONFIG_K8_NUMA
 940         if (!acpi)
 941                 k8 = !k8_numa_init(0, max_pfn);
 942 #endif
 943
 944         initmem_init(0, max_pfn, acpi, k8);
 945
 946 #ifdef CONFIG_X86_64
 947         /*
 948          * dma32_reserve_bootmem() allocates bootmem which may conflict
 949          * with the crashkernel command line, so do that after
 950          * reserve_crashkernel()
 951          */
 952         dma32_reserve_bootmem();
 953 #endif
 954
 955         reserve_ibft_region();
 956
 957 #ifdef CONFIG_KVM_CLOCK
 958         kvmclock_init();
 959 #endif
 960
 961         x86_init.paging.pagetable_setup_start(swapper_pg_dir);
 962         paging_init();
 963         x86_init.paging.pagetable_setup_done(swapper_pg_dir);
 964
 965         tboot_probe();
 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         sfi_init();
 981
 982         /*
 983          * get boot-time SMP configuration:
 984          */
 985         if (smp_found_config)
 986                 get_smp_config();
 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         x86_init.resources.reserve_resources();
1006
1007         e820_setup_gap();
1008
1009 #ifdef CONFIG_VT
1010 #if defined(CONFIG_VGA_CONSOLE)
1011         if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
1012                 conswitchp = &vga_con;
1013 #elif defined(CONFIG_DUMMY_CONSOLE)
1014         conswitchp = &dummy_con;
1015 #endif
1016 #endif
1017         x86_init.oem.banner();
1018
1019         mcheck_init();
1020 }
1021
1022 #ifdef CONFIG_X86_32
1023
1024 static struct resource video_ram_resource = {
1025         .name   = "Video RAM area",
1026         .start  = 0xa0000,
1027         .end    = 0xbffff,
1028         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
1029 };
1030
1031 void __init i386_reserve_resources(void)
1032 {
1033         request_resource(&iomem_resource, &video_ram_resource);
1034         reserve_standard_io_resources();
1035 }
1036
1037 #endif /* CONFIG_X86_32 */