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/e820.h>
  77 #include <asm/mpspec.h>
  78 #include <asm/setup.h>
  79 #include <asm/efi.h>
  80 #include <asm/timer.h>
  81 #include <asm/i8259.h>
  82 #include <asm/sections.h>
  83 #include <asm/dmi.h>
  84 #include <asm/io_apic.h>
  85 #include <asm/ist.h>
  86 #include <asm/vmi.h>
  87 #include <asm/setup_arch.h>
  88 #include <asm/bios_ebda.h>
  89 #include <asm/cacheflush.h>
  90 #include <asm/processor.h>
  91 #include <asm/bugs.h>
  92
  93 #include <asm/system.h>
  94 #include <asm/vsyscall.h>
  95 #include <asm/cpu.h>
  96 #include <asm/desc.h>
  97 #include <asm/dma.h>
  98 #include <asm/iommu.h>
  99 #include <asm/gart.h>
 100 #include <asm/mmu_context.h>
 101 #include <asm/proto.h>
 102
 103 #include <asm/paravirt.h>
 104 #include <asm/hypervisor.h>
 105
 106 #include <asm/percpu.h>
 107 #include <asm/topology.h>
 108 #include <asm/apicdef.h>
 109 #ifdef CONFIG_X86_64
 110 #include <asm/numa_64.h>
 111 #endif
 112 #include <asm/mce.h>
 113 #include <asm/trampoline.h>
 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 phys_apicid)
 137 {
 138         return __default_check_phys_apicid_present(phys_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 /* cpu data as detected by the assembly code in head.S */
 175 struct cpuinfo_x86 new_cpu_data __cpuinitdata = {0, 0, 0, 0, -1, 1, 0, 0, -1};
 176 /* common cpu data for all cpus */
 177 struct cpuinfo_x86 boot_cpu_data __read_mostly = {0, 0, 0, 0, -1, 1, 0, 0, -1};
 178 EXPORT_SYMBOL(boot_cpu_data);
 179 static void set_mca_bus(int x)
 180 {
 181 #ifdef CONFIG_MCA
 182         MCA_bus = x;
 183 #endif
 184 }
 185
 186 unsigned int def_to_bigsmp;
 187
 188 /* for MCA, but anyone else can use it if they want */
 189 unsigned int machine_id;
 190 unsigned int machine_submodel_id;
 191 unsigned int BIOS_revision;
 192
 193 struct apm_info apm_info;
 194 EXPORT_SYMBOL(apm_info);
 195
 196 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
 197         defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
 198 struct ist_info ist_info;
 199 EXPORT_SYMBOL(ist_info);
 200 #else
 201 struct ist_info ist_info;
 202 #endif
 203
 204 #else
 205 struct cpuinfo_x86 boot_cpu_data __read_mostly = {
 206         .x86_phys_bits = MAX_PHYSMEM_BITS,
 207 };
 208 EXPORT_SYMBOL(boot_cpu_data);
 209 #endif
 210
 211
 212 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
 213 unsigned long mmu_cr4_features;
 214 #else
 215 unsigned long mmu_cr4_features = X86_CR4_PAE;
 216 #endif
 217
 218 /* Boot loader ID and version as integers, for the benefit of proc_dointvec */
 219 int bootloader_type, bootloader_version;
 220
 221 /*
 222  * Setup options
 223  */
 224 struct screen_info screen_info;
 225 EXPORT_SYMBOL(screen_info);
 226 struct edid_info edid_info;
 227 EXPORT_SYMBOL_GPL(edid_info);
 228
 229 extern int root_mountflags;
 230
 231 unsigned long saved_video_mode;
 232
 233 #define RAMDISK_IMAGE_START_MASK        0x07FF
 234 #define RAMDISK_PROMPT_FLAG             0x8000
 235 #define RAMDISK_LOAD_FLAG               0x4000
 236
 237 static char __initdata command_line[COMMAND_LINE_SIZE];
 238 #ifdef CONFIG_CMDLINE_BOOL
 239 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
 240 #endif
 241
 242 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
 243 struct edd edd;
 244 #ifdef CONFIG_EDD_MODULE
 245 EXPORT_SYMBOL(edd);
 246 #endif
 247 /**
 248  * copy_edd() - Copy the BIOS EDD information
 249  *              from boot_params into a safe place.
 250  *
 251  */
 252 static inline void copy_edd(void)
 253 {
 254      memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
 255             sizeof(edd.mbr_signature));
 256      memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
 257      edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
 258      edd.edd_info_nr = boot_params.eddbuf_entries;
 259 }
 260 #else
 261 static inline void copy_edd(void)
 262 {
 263 }
 264 #endif
 265
 266 void * __init extend_brk(size_t size, size_t align)
 267 {
 268         size_t mask = align - 1;
 269         void *ret;
 270
 271         BUG_ON(_brk_start == 0);
 272         BUG_ON(align & mask);
 273
 274         _brk_end = (_brk_end + mask) & ~mask;
 275         BUG_ON((char *)(_brk_end + size) > __brk_limit);
 276
 277         ret = (void *)_brk_end;
 278         _brk_end += size;
 279
 280         memset(ret, 0, size);
 281
 282         return ret;
 283 }
 284
 285 #ifdef CONFIG_X86_64
 286 static void __init init_gbpages(void)
 287 {
 288         if (direct_gbpages && cpu_has_gbpages)
 289                 printk(KERN_INFO "Using GB pages for direct mapping\n");
 290         else
 291                 direct_gbpages = 0;
 292 }
 293 #else
 294 static inline void init_gbpages(void)
 295 {
 296 }
 297 static void __init cleanup_highmap(void)
 298 {
 299 }
 300 #endif
 301
 302 static void __init reserve_brk(void)
 303 {
 304         if (_brk_end > _brk_start)
 305                 reserve_early(__pa(_brk_start), __pa(_brk_end), "BRK");
 306
 307         /* Mark brk area as locked down and no longer taking any
 308            new allocations */
 309         _brk_start = 0;
 310 }
 311
 312 #ifdef CONFIG_BLK_DEV_INITRD
 313
 314 #define MAX_MAP_CHUNK   (NR_FIX_BTMAPS << PAGE_SHIFT)
 315 static void __init relocate_initrd(void)
 316 {
 317
 318         u64 ramdisk_image = boot_params.hdr.ramdisk_image;
 319         u64 ramdisk_size  = boot_params.hdr.ramdisk_size;
 320         u64 end_of_lowmem = max_low_pfn_mapped << PAGE_SHIFT;
 321         u64 ramdisk_here;
 322         unsigned long slop, clen, mapaddr;
 323         char *p, *q;
 324
 325         /* We need to move the initrd down into lowmem */
 326         ramdisk_here = find_e820_area(0, end_of_lowmem, ramdisk_size,
 327                                          PAGE_SIZE);
 328
 329         if (ramdisk_here == -1ULL)
 330                 panic("Cannot find place for new RAMDISK of size %lld\n",
 331                          ramdisk_size);
 332
 333         /* Note: this includes all the lowmem currently occupied by
 334            the initrd, we rely on that fact to keep the data intact. */
 335         reserve_early(ramdisk_here, ramdisk_here + ramdisk_size,
 336                          "NEW RAMDISK");
 337         initrd_start = ramdisk_here + PAGE_OFFSET;
 338         initrd_end   = initrd_start + ramdisk_size;
 339         printk(KERN_INFO "Allocated new RAMDISK: %08llx - %08llx\n",
 340                          ramdisk_here, ramdisk_here + ramdisk_size);
 341
 342         q = (char *)initrd_start;
 343
 344         /* Copy any lowmem portion of the initrd */
 345         if (ramdisk_image < end_of_lowmem) {
 346                 clen = end_of_lowmem - ramdisk_image;
 347                 p = (char *)__va(ramdisk_image);
 348                 memcpy(q, p, clen);
 349                 q += clen;
 350                 ramdisk_image += clen;
 351                 ramdisk_size  -= clen;
 352         }
 353
 354         /* Copy the highmem portion of the initrd */
 355         while (ramdisk_size) {
 356                 slop = ramdisk_image & ~PAGE_MASK;
 357                 clen = ramdisk_size;
 358                 if (clen > MAX_MAP_CHUNK-slop)
 359                         clen = MAX_MAP_CHUNK-slop;
 360                 mapaddr = ramdisk_image & PAGE_MASK;
 361                 p = early_memremap(mapaddr, clen+slop);
 362                 memcpy(q, p+slop, clen);
 363                 early_iounmap(p, clen+slop);
 364                 q += clen;
 365                 ramdisk_image += clen;
 366                 ramdisk_size  -= clen;
 367         }
 368         /* high pages is not converted by early_res_to_bootmem */
 369         ramdisk_image = boot_params.hdr.ramdisk_image;
 370         ramdisk_size  = boot_params.hdr.ramdisk_size;
 371         printk(KERN_INFO "Move RAMDISK from %016llx - %016llx to"
 372                 " %08llx - %08llx\n",
 373                 ramdisk_image, ramdisk_image + ramdisk_size - 1,
 374                 ramdisk_here, ramdisk_here + ramdisk_size - 1);
 375 }
 376
 377 static void __init reserve_initrd(void)
 378 {
 379         u64 ramdisk_image = boot_params.hdr.ramdisk_image;
 380         u64 ramdisk_size  = boot_params.hdr.ramdisk_size;
 381         u64 ramdisk_end   = ramdisk_image + ramdisk_size;
 382         u64 end_of_lowmem = max_low_pfn_mapped << PAGE_SHIFT;
 383
 384         if (!boot_params.hdr.type_of_loader ||
 385             !ramdisk_image || !ramdisk_size)
 386                 return;         /* No initrd provided by bootloader */
 387
 388         initrd_start = 0;
 389
 390         if (ramdisk_size >= (end_of_lowmem>>1)) {
 391                 free_early(ramdisk_image, ramdisk_end);
 392                 printk(KERN_ERR "initrd too large to handle, "
 393                        "disabling initrd\n");
 394                 return;
 395         }
 396
 397         printk(KERN_INFO "RAMDISK: %08llx - %08llx\n", ramdisk_image,
 398                         ramdisk_end);
 399
 400
 401         if (ramdisk_end <= end_of_lowmem) {
 402                 /* All in lowmem, easy case */
 403                 /*
 404                  * don't need to reserve again, already reserved early
 405                  * in i386_start_kernel
 406                  */
 407                 initrd_start = ramdisk_image + PAGE_OFFSET;
 408                 initrd_end = initrd_start + ramdisk_size;
 409                 return;
 410         }
 411
 412         relocate_initrd();
 413
 414         free_early(ramdisk_image, ramdisk_end);
 415 }
 416 #else
 417 static void __init reserve_initrd(void)
 418 {
 419 }
 420 #endif /* CONFIG_BLK_DEV_INITRD */
 421
 422 static void __init parse_setup_data(void)
 423 {
 424         struct setup_data *data;
 425         u64 pa_data;
 426
 427         if (boot_params.hdr.version < 0x0209)
 428                 return;
 429         pa_data = boot_params.hdr.setup_data;
 430         while (pa_data) {
 431                 data = early_memremap(pa_data, PAGE_SIZE);
 432                 switch (data->type) {
 433                 case SETUP_E820_EXT:
 434                         parse_e820_ext(data, pa_data);
 435                         break;
 436                 default:
 437                         break;
 438                 }
 439                 pa_data = data->next;
 440                 early_iounmap(data, PAGE_SIZE);
 441         }
 442 }
 443
 444 static void __init e820_reserve_setup_data(void)
 445 {
 446         struct setup_data *data;
 447         u64 pa_data;
 448         int found = 0;
 449
 450         if (boot_params.hdr.version < 0x0209)
 451                 return;
 452         pa_data = boot_params.hdr.setup_data;
 453         while (pa_data) {
 454                 data = early_memremap(pa_data, sizeof(*data));
 455                 e820_update_range(pa_data, sizeof(*data)+data->len,
 456                          E820_RAM, E820_RESERVED_KERN);
 457                 found = 1;
 458                 pa_data = data->next;
 459                 early_iounmap(data, sizeof(*data));
 460         }
 461         if (!found)
 462                 return;
 463
 464         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 465         memcpy(&e820_saved, &e820, sizeof(struct e820map));
 466         printk(KERN_INFO "extended physical RAM map:\n");
 467         e820_print_map("reserve setup_data");
 468 }
 469
 470 static void __init reserve_early_setup_data(void)
 471 {
 472         struct setup_data *data;
 473         u64 pa_data;
 474         char buf[32];
 475
 476         if (boot_params.hdr.version < 0x0209)
 477                 return;
 478         pa_data = boot_params.hdr.setup_data;
 479         while (pa_data) {
 480                 data = early_memremap(pa_data, sizeof(*data));
 481                 sprintf(buf, "setup data %x", data->type);
 482                 reserve_early(pa_data, pa_data+sizeof(*data)+data->len, buf);
 483                 pa_data = data->next;
 484                 early_iounmap(data, sizeof(*data));
 485         }
 486 }
 487
 488 /*
 489  * --------- Crashkernel reservation ------------------------------
 490  */
 491
 492 #ifdef CONFIG_KEXEC
 493
 494 /**
 495  * Reserve @size bytes of crashkernel memory at any suitable offset.
 496  *
 497  * @size: Size of the crashkernel memory to reserve.
 498  * Returns the base address on success, and -1ULL on failure.
 499  */
 500 static
 501 unsigned long long __init find_and_reserve_crashkernel(unsigned long long size)
 502 {
 503         const unsigned long long alignment = 16<<20;    /* 16M */
 504         unsigned long long start = 0LL;
 505
 506         while (1) {
 507                 int ret;
 508
 509                 start = find_e820_area(start, ULONG_MAX, size, alignment);
 510                 if (start == -1ULL)
 511                         return start;
 512
 513                 /* try to reserve it */
 514                 ret = reserve_bootmem_generic(start, size, BOOTMEM_EXCLUSIVE);
 515                 if (ret >= 0)
 516                         return start;
 517
 518                 start += alignment;
 519         }
 520 }
 521
 522 static inline unsigned long long get_total_mem(void)
 523 {
 524         unsigned long long total;
 525
 526         total = max_low_pfn - min_low_pfn;
 527 #ifdef CONFIG_HIGHMEM
 528         total += highend_pfn - highstart_pfn;
 529 #endif
 530
 531         return total << PAGE_SHIFT;
 532 }
 533
 534 static void __init reserve_crashkernel(void)
 535 {
 536         unsigned long long total_mem;
 537         unsigned long long crash_size, crash_base;
 538         int ret;
 539
 540         total_mem = get_total_mem();
 541
 542         ret = parse_crashkernel(boot_command_line, total_mem,
 543                         &crash_size, &crash_base);
 544         if (ret != 0 || crash_size <= 0)
 545                 return;
 546
 547         /* 0 means: find the address automatically */
 548         if (crash_base <= 0) {
 549                 crash_base = find_and_reserve_crashkernel(crash_size);
 550                 if (crash_base == -1ULL) {
 551                         pr_info("crashkernel reservation failed. "
 552                                 "No suitable area found.\n");
 553                         return;
 554                 }
 555         } else {
 556                 ret = reserve_bootmem_generic(crash_base, crash_size,
 557                                         BOOTMEM_EXCLUSIVE);
 558                 if (ret < 0) {
 559                         pr_info("crashkernel reservation failed - "
 560                                 "memory is in use\n");
 561                         return;
 562                 }
 563         }
 564
 565         printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
 566                         "for crashkernel (System RAM: %ldMB)\n",
 567                         (unsigned long)(crash_size >> 20),
 568                         (unsigned long)(crash_base >> 20),
 569                         (unsigned long)(total_mem >> 20));
 570
 571         crashk_res.start = crash_base;
 572         crashk_res.end   = crash_base + crash_size - 1;
 573         insert_resource(&iomem_resource, &crashk_res);
 574 }
 575 #else
 576 static void __init reserve_crashkernel(void)
 577 {
 578 }
 579 #endif
 580
 581 static struct resource standard_io_resources[] = {
 582         { .name = "dma1", .start = 0x00, .end = 0x1f,
 583                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 584         { .name = "pic1", .start = 0x20, .end = 0x21,
 585                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 586         { .name = "timer0", .start = 0x40, .end = 0x43,
 587                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 588         { .name = "timer1", .start = 0x50, .end = 0x53,
 589                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 590         { .name = "keyboard", .start = 0x60, .end = 0x60,
 591                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 592         { .name = "keyboard", .start = 0x64, .end = 0x64,
 593                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 594         { .name = "dma page reg", .start = 0x80, .end = 0x8f,
 595                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 596         { .name = "pic2", .start = 0xa0, .end = 0xa1,
 597                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 598         { .name = "dma2", .start = 0xc0, .end = 0xdf,
 599                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 600         { .name = "fpu", .start = 0xf0, .end = 0xff,
 601                 .flags = IORESOURCE_BUSY | IORESOURCE_IO }
 602 };
 603
 604 void __init reserve_standard_io_resources(void)
 605 {
 606         int i;
 607
 608         /* request I/O space for devices used on all i[345]86 PCs */
 609         for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
 610                 request_resource(&ioport_resource, &standard_io_resources[i]);
 611
 612 }
 613
 614 /*
 615  * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
 616  * is_kdump_kernel() to determine if we are booting after a panic. Hence
 617  * ifdef it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
 618  */
 619
 620 #ifdef CONFIG_CRASH_DUMP
 621 /* elfcorehdr= specifies the location of elf core header
 622  * stored by the crashed kernel. This option will be passed
 623  * by kexec loader to the capture kernel.
 624  */
 625 static int __init setup_elfcorehdr(char *arg)
 626 {
 627         char *end;
 628         if (!arg)
 629                 return -EINVAL;
 630         elfcorehdr_addr = memparse(arg, &end);
 631         return end > arg ? 0 : -EINVAL;
 632 }
 633 early_param("elfcorehdr", setup_elfcorehdr);
 634 #endif
 635
 636 #ifdef CONFIG_X86_RESERVE_LOW_64K
 637 static int __init dmi_low_memory_corruption(const struct dmi_system_id *d)
 638 {
 639         printk(KERN_NOTICE
 640                 "%s detected: BIOS may corrupt low RAM, working around it.\n",
 641                 d->ident);
 642
 643         e820_update_range(0, 0x10000, E820_RAM, E820_RESERVED);
 644         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 645
 646         return 0;
 647 }
 648 #endif
 649
 650 /* List of systems that have known low memory corruption BIOS problems */
 651 static struct dmi_system_id __initdata bad_bios_dmi_table[] = {
 652 #ifdef CONFIG_X86_RESERVE_LOW_64K
 653         {
 654                 .callback = dmi_low_memory_corruption,
 655                 .ident = "AMI BIOS",
 656                 .matches = {
 657                         DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
 658                 },
 659         },
 660         {
 661                 .callback = dmi_low_memory_corruption,
 662                 .ident = "Phoenix BIOS",
 663                 .matches = {
 664                         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies"),
 665                 },
 666         },
 667         {
 668                 .callback = dmi_low_memory_corruption,
 669                 .ident = "Phoenix/MSC BIOS",
 670                 .matches = {
 671                         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix/MSC"),
 672                 },
 673         },
 674         /*
 675          * AMI BIOS with low memory corruption was found on Intel DG45ID and
 676          * DG45FC boards.
 677          * It has a different DMI_BIOS_VENDOR = "Intel Corp.", for now we will
 678          * match only DMI_BOARD_NAME and see if there is more bad products
 679          * with this vendor.
 680          */
 681         {
 682                 .callback = dmi_low_memory_corruption,
 683                 .ident = "AMI BIOS",
 684                 .matches = {
 685                         DMI_MATCH(DMI_BOARD_NAME, "DG45ID"),
 686                 },
 687         },
 688         {
 689                 .callback = dmi_low_memory_corruption,
 690                 .ident = "AMI BIOS",
 691                 .matches = {
 692                         DMI_MATCH(DMI_BOARD_NAME, "DG45FC"),
 693                 },
 694         },
 695         /*
 696          * The Dell Inspiron Mini 1012 has DMI_BIOS_VENDOR = "Dell Inc.", so
 697          * match on the product name.
 698          */
 699         {
 700                 .callback = dmi_low_memory_corruption,
 701                 .ident = "Phoenix BIOS",
 702                 .matches = {
 703                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1012"),
 704                 },
 705         },
 706 #endif
 707         {}
 708 };
 709
 710 /*
 711  * Determine if we were loaded by an EFI loader.  If so, then we have also been
 712  * passed the efi memmap, systab, etc., so we should use these data structures
 713  * for initialization.  Note, the efi init code path is determined by the
 714  * global efi_enabled. This allows the same kernel image to be used on existing
 715  * systems (with a traditional BIOS) as well as on EFI systems.
 716  */
 717 /*
 718  * setup_arch - architecture-specific boot-time initializations
 719  *
 720  * Note: On x86_64, fixmaps are ready for use even before this is called.
 721  */
 722
 723 void __init setup_arch(char **cmdline_p)
 724 {
 725 #ifdef CONFIG_X86_32
 726         memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
 727         visws_early_detect();
 728 #else
 729         printk(KERN_INFO "Command line: %s\n", boot_command_line);
 730 #endif
 731
 732         /* VMI may relocate the fixmap; do this before touching ioremap area */
 733         vmi_init();
 734
 735         early_cpu_init();
 736         early_ioremap_init();
 737
 738         ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
 739         screen_info = boot_params.screen_info;
 740         edid_info = boot_params.edid_info;
 741 #ifdef CONFIG_X86_32
 742         apm_info.bios = boot_params.apm_bios_info;
 743         ist_info = boot_params.ist_info;
 744         if (boot_params.sys_desc_table.length != 0) {
 745                 set_mca_bus(boot_params.sys_desc_table.table[3] & 0x2);
 746                 machine_id = boot_params.sys_desc_table.table[0];
 747                 machine_submodel_id = boot_params.sys_desc_table.table[1];
 748                 BIOS_revision = boot_params.sys_desc_table.table[2];
 749         }
 750 #endif
 751         saved_video_mode = boot_params.hdr.vid_mode;
 752         bootloader_type = boot_params.hdr.type_of_loader;
 753         if ((bootloader_type >> 4) == 0xe) {
 754                 bootloader_type &= 0xf;
 755                 bootloader_type |= (boot_params.hdr.ext_loader_type+0x10) << 4;
 756         }
 757         bootloader_version  = bootloader_type & 0xf;
 758         bootloader_version |= boot_params.hdr.ext_loader_ver << 4;
 759
 760 #ifdef CONFIG_BLK_DEV_RAM
 761         rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
 762         rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
 763         rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
 764 #endif
 765 #ifdef CONFIG_EFI
 766         if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
 767 #ifdef CONFIG_X86_32
 768                      "EL32",
 769 #else
 770                      "EL64",
 771 #endif
 772          4)) {
 773                 efi_enabled = 1;
 774                 efi_reserve_early();
 775         }
 776 #endif
 777
 778         x86_init.oem.arch_setup();
 779
 780         setup_memory_map();
 781         parse_setup_data();
 782         /* update the e820_saved too */
 783         e820_reserve_setup_data();
 784
 785         copy_edd();
 786
 787         if (!boot_params.hdr.root_flags)
 788                 root_mountflags &= ~MS_RDONLY;
 789         init_mm.start_code = (unsigned long) _text;
 790         init_mm.end_code = (unsigned long) _etext;
 791         init_mm.end_data = (unsigned long) _edata;
 792         init_mm.brk = _brk_end;
 793
 794         code_resource.start = virt_to_phys(_text);
 795         code_resource.end = virt_to_phys(_etext)-1;
 796         data_resource.start = virt_to_phys(_etext);
 797         data_resource.end = virt_to_phys(_edata)-1;
 798         bss_resource.start = virt_to_phys(&__bss_start);
 799         bss_resource.end = virt_to_phys(&__bss_stop)-1;
 800
 801 #ifdef CONFIG_CMDLINE_BOOL
 802 #ifdef CONFIG_CMDLINE_OVERRIDE
 803         strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 804 #else
 805         if (builtin_cmdline[0]) {
 806                 /* append boot loader cmdline to builtin */
 807                 strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE);
 808                 strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE);
 809                 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 810         }
 811 #endif
 812 #endif
 813
 814         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 815         *cmdline_p = command_line;
 816
 817 #ifdef CONFIG_X86_64
 818         /*
 819          * Must call this twice: Once just to detect whether hardware doesn't
 820          * support NX (so that the early EHCI debug console setup can safely
 821          * call set_fixmap(), and then again after parsing early parameters to
 822          * honor the respective command line option.
 823          */
 824         check_efer();
 825 #endif
 826
 827         parse_early_param();
 828
 829 #ifdef CONFIG_X86_64
 830         check_efer();
 831 #endif
 832
 833         /* Must be before kernel pagetables are setup */
 834         vmi_activate();
 835
 836         /* after early param, so could get panic from serial */
 837         reserve_early_setup_data();
 838
 839         if (acpi_mps_check()) {
 840 #ifdef CONFIG_X86_LOCAL_APIC
 841                 disable_apic = 1;
 842 #endif
 843                 setup_clear_cpu_cap(X86_FEATURE_APIC);
 844         }
 845
 846 #ifdef CONFIG_PCI
 847         if (pci_early_dump_regs)
 848                 early_dump_pci_devices();
 849 #endif
 850
 851         finish_e820_parsing();
 852
 853         if (efi_enabled)
 854                 efi_init();
 855
 856         dmi_scan_machine();
 857
 858         dmi_check_system(bad_bios_dmi_table);
 859
 860         /*
 861          * VMware detection requires dmi to be available, so this
 862          * needs to be done after dmi_scan_machine, for the BP.
 863          */
 864         init_hypervisor_platform();
 865
 866         x86_init.resources.probe_roms();
 867
 868         /* after parse_early_param, so could debug it */
 869         insert_resource(&iomem_resource, &code_resource);
 870         insert_resource(&iomem_resource, &data_resource);
 871         insert_resource(&iomem_resource, &bss_resource);
 872
 873
 874 #ifdef CONFIG_X86_32
 875         if (ppro_with_ram_bug()) {
 876                 e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM,
 877                                   E820_RESERVED);
 878                 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 879                 printk(KERN_INFO "fixed physical RAM map:\n");
 880                 e820_print_map("bad_ppro");
 881         }
 882 #else
 883         early_gart_iommu_check();
 884 #endif
 885
 886         /*
 887          * partially used pages are not usable - thus
 888          * we are rounding upwards:
 889          */
 890         max_pfn = e820_end_of_ram_pfn();
 891
 892         /* preallocate 4k for mptable mpc */
 893         early_reserve_e820_mpc_new();
 894         /* update e820 for memory not covered by WB MTRRs */
 895         mtrr_bp_init();
 896         if (mtrr_trim_uncached_memory(max_pfn))
 897                 max_pfn = e820_end_of_ram_pfn();
 898
 899 #ifdef CONFIG_X86_32
 900         /* max_low_pfn get updated here */
 901         find_low_pfn_range();
 902 #else
 903         num_physpages = max_pfn;
 904
 905         check_x2apic();
 906
 907         /* How many end-of-memory variables you have, grandma! */
 908         /* need this before calling reserve_initrd */
 909         if (max_pfn > (1UL<<(32 - PAGE_SHIFT)))
 910                 max_low_pfn = e820_end_of_low_ram_pfn();
 911         else
 912                 max_low_pfn = max_pfn;
 913
 914         high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
 915         max_pfn_mapped = KERNEL_IMAGE_SIZE >> PAGE_SHIFT;
 916 #endif
 917
 918 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
 919         setup_bios_corruption_check();
 920 #endif
 921
 922         printk(KERN_DEBUG "initial memory mapped : 0 - %08lx\n",
 923                         max_pfn_mapped<<PAGE_SHIFT);
 924
 925         reserve_brk();
 926
 927         cleanup_highmap();
 928
 929         init_gbpages();
 930
 931         /* max_pfn_mapped is updated here */
 932         max_low_pfn_mapped = init_memory_mapping(0, max_low_pfn<<PAGE_SHIFT);
 933         max_pfn_mapped = max_low_pfn_mapped;
 934
 935 #ifdef CONFIG_X86_64
 936         if (max_pfn > max_low_pfn) {
 937                 max_pfn_mapped = init_memory_mapping(1UL<<32,
 938                                                      max_pfn<<PAGE_SHIFT);
 939                 /* can we preseve max_low_pfn ?*/
 940                 max_low_pfn = max_pfn;
 941         }
 942 #endif
 943
 944         /*
 945          * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
 946          */
 947
 948 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
 949         if (init_ohci1394_dma_early)
 950                 init_ohci1394_dma_on_all_controllers();
 951 #endif
 952
 953         reserve_initrd();
 954
 955         vsmp_init();
 956
 957         io_delay_init();
 958
 959         /*
 960          * Parse the ACPI tables for possible boot-time SMP configuration.
 961          */
 962         acpi_boot_table_init();
 963
 964         early_acpi_boot_init();
 965
 966 #ifdef CONFIG_ACPI_NUMA
 967         /*
 968          * Parse SRAT to discover nodes.
 969          */
 970         acpi_numa_init();
 971 #endif
 972
 973         initmem_init(0, max_pfn);
 974
 975 #ifdef CONFIG_ACPI_SLEEP
 976         /*
 977          * Reserve low memory region for sleep support.
 978          */
 979         acpi_reserve_bootmem();
 980 #endif
 981         /*
 982          * Find and reserve possible boot-time SMP configuration:
 983          */
 984         find_smp_config();
 985
 986         reserve_crashkernel();
 987
 988 #ifdef CONFIG_X86_64
 989         /*
 990          * dma32_reserve_bootmem() allocates bootmem which may conflict
 991          * with the crashkernel command line, so do that after
 992          * reserve_crashkernel()
 993          */
 994         dma32_reserve_bootmem();
 995 #endif
 996
 997         reserve_ibft_region();
 998
 999 #ifdef CONFIG_KVM_CLOCK
1000         kvmclock_init();
1001 #endif
1002
1003         x86_init.paging.pagetable_setup_start(swapper_pg_dir);
1004         paging_init();
1005         x86_init.paging.pagetable_setup_done(swapper_pg_dir);
1006
1007         setup_trampoline_page_table();
1008
1009         tboot_probe();
1010
1011 #ifdef CONFIG_X86_64
1012         map_vsyscall();
1013 #endif
1014
1015         generic_apic_probe();
1016
1017         early_quirks();
1018
1019         /*
1020          * Read APIC and some other early information from ACPI tables.
1021          */
1022         acpi_boot_init();
1023
1024         sfi_init();
1025
1026         /*
1027          * get boot-time SMP configuration:
1028          */
1029         if (smp_found_config)
1030                 get_smp_config();
1031
1032         prefill_possible_map();
1033
1034 #ifdef CONFIG_X86_64
1035         init_cpu_to_node();
1036 #endif
1037
1038         init_apic_mappings();
1039         ioapic_init_mappings();
1040
1041         /* need to wait for io_apic is mapped */
1042         probe_nr_irqs_gsi();
1043
1044         kvm_guest_init();
1045
1046         e820_reserve_resources();
1047         e820_mark_nosave_regions(max_low_pfn);
1048
1049         x86_init.resources.reserve_resources();
1050
1051         e820_setup_gap();
1052
1053 #ifdef CONFIG_VT
1054 #if defined(CONFIG_VGA_CONSOLE)
1055         if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
1056                 conswitchp = &vga_con;
1057 #elif defined(CONFIG_DUMMY_CONSOLE)
1058         conswitchp = &dummy_con;
1059 #endif
1060 #endif
1061         x86_init.oem.banner();
1062
1063         mcheck_intel_therm_init();
1064 }
1065
1066 #ifdef CONFIG_X86_32
1067
1068 static struct resource video_ram_resource = {
1069         .name   = "Video RAM area",
1070         .start  = 0xa0000,
1071         .end    = 0xbffff,
1072         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
1073 };
1074
1075 void __init i386_reserve_resources(void)
1076 {
1077         request_resource(&iomem_resource, &video_ram_resource);
1078         reserve_standard_io_resources();
1079 }
1080
1081 #endif /* CONFIG_X86_32 */