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
 113 /*
 114  * end_pfn only includes RAM, while max_pfn_mapped includes all e820 entries.
 115  * The direct mapping extends to max_pfn_mapped, so that we can directly access
 116  * apertures, ACPI and other tables without having to play with fixmaps.
 117  */
 118 unsigned long max_low_pfn_mapped;
 119 unsigned long max_pfn_mapped;
 120
 121 RESERVE_BRK(dmi_alloc, 65536);
 122
 123 unsigned int boot_cpu_id __read_mostly;
 124
 125 static __initdata unsigned long _brk_start = (unsigned long)__brk_base;
 126 unsigned long _brk_end = (unsigned long)__brk_base;
 127
 128 #ifdef CONFIG_X86_64
 129 int default_cpu_present_to_apicid(int mps_cpu)
 130 {
 131         return __default_cpu_present_to_apicid(mps_cpu);
 132 }
 133
 134 int default_check_phys_apicid_present(int phys_apicid)
 135 {
 136         return __default_check_phys_apicid_present(phys_apicid);
 137 }
 138 #endif
 139
 140 #ifndef CONFIG_DEBUG_BOOT_PARAMS
 141 struct boot_params __initdata boot_params;
 142 #else
 143 struct boot_params boot_params;
 144 #endif
 145
 146 /*
 147  * Machine setup..
 148  */
 149 static struct resource data_resource = {
 150         .name   = "Kernel data",
 151         .start  = 0,
 152         .end    = 0,
 153         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 154 };
 155
 156 static struct resource code_resource = {
 157         .name   = "Kernel code",
 158         .start  = 0,
 159         .end    = 0,
 160         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 161 };
 162
 163 static struct resource bss_resource = {
 164         .name   = "Kernel bss",
 165         .start  = 0,
 166         .end    = 0,
 167         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 168 };
 169
 170
 171 #ifdef CONFIG_X86_32
 172 /* cpu data as detected by the assembly code in head.S */
 173 struct cpuinfo_x86 new_cpu_data __cpuinitdata = {0, 0, 0, 0, -1, 1, 0, 0, -1};
 174 /* common cpu data for all cpus */
 175 struct cpuinfo_x86 boot_cpu_data __read_mostly = {0, 0, 0, 0, -1, 1, 0, 0, -1};
 176 EXPORT_SYMBOL(boot_cpu_data);
 177 static void set_mca_bus(int x)
 178 {
 179 #ifdef CONFIG_MCA
 180         MCA_bus = x;
 181 #endif
 182 }
 183
 184 unsigned int def_to_bigsmp;
 185
 186 /* for MCA, but anyone else can use it if they want */
 187 unsigned int machine_id;
 188 unsigned int machine_submodel_id;
 189 unsigned int BIOS_revision;
 190
 191 struct apm_info apm_info;
 192 EXPORT_SYMBOL(apm_info);
 193
 194 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
 195         defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
 196 struct ist_info ist_info;
 197 EXPORT_SYMBOL(ist_info);
 198 #else
 199 struct ist_info ist_info;
 200 #endif
 201
 202 #else
 203 struct cpuinfo_x86 boot_cpu_data __read_mostly = {
 204         .x86_phys_bits = MAX_PHYSMEM_BITS,
 205 };
 206 EXPORT_SYMBOL(boot_cpu_data);
 207 #endif
 208
 209
 210 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
 211 unsigned long mmu_cr4_features;
 212 #else
 213 unsigned long mmu_cr4_features = X86_CR4_PAE;
 214 #endif
 215
 216 /* Boot loader ID and version as integers, for the benefit of proc_dointvec */
 217 int bootloader_type, bootloader_version;
 218
 219 /*
 220  * Setup options
 221  */
 222 struct screen_info screen_info;
 223 EXPORT_SYMBOL(screen_info);
 224 struct edid_info edid_info;
 225 EXPORT_SYMBOL_GPL(edid_info);
 226
 227 extern int root_mountflags;
 228
 229 unsigned long saved_video_mode;
 230
 231 #define RAMDISK_IMAGE_START_MASK        0x07FF
 232 #define RAMDISK_PROMPT_FLAG             0x8000
 233 #define RAMDISK_LOAD_FLAG               0x4000
 234
 235 static char __initdata command_line[COMMAND_LINE_SIZE];
 236 #ifdef CONFIG_CMDLINE_BOOL
 237 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
 238 #endif
 239
 240 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
 241 struct edd edd;
 242 #ifdef CONFIG_EDD_MODULE
 243 EXPORT_SYMBOL(edd);
 244 #endif
 245 /**
 246  * copy_edd() - Copy the BIOS EDD information
 247  *              from boot_params into a safe place.
 248  *
 249  */
 250 static inline void copy_edd(void)
 251 {
 252      memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
 253             sizeof(edd.mbr_signature));
 254      memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
 255      edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
 256      edd.edd_info_nr = boot_params.eddbuf_entries;
 257 }
 258 #else
 259 static inline void copy_edd(void)
 260 {
 261 }
 262 #endif
 263
 264 void * __init extend_brk(size_t size, size_t align)
 265 {
 266         size_t mask = align - 1;
 267         void *ret;
 268
 269         BUG_ON(_brk_start == 0);
 270         BUG_ON(align & mask);
 271
 272         _brk_end = (_brk_end + mask) & ~mask;
 273         BUG_ON((char *)(_brk_end + size) > __brk_limit);
 274
 275         ret = (void *)_brk_end;
 276         _brk_end += size;
 277
 278         memset(ret, 0, size);
 279
 280         return ret;
 281 }
 282
 283 #ifdef CONFIG_X86_64
 284 static void __init init_gbpages(void)
 285 {
 286         if (direct_gbpages && cpu_has_gbpages)
 287                 printk(KERN_INFO "Using GB pages for direct mapping\n");
 288         else
 289                 direct_gbpages = 0;
 290 }
 291 #else
 292 static inline void init_gbpages(void)
 293 {
 294 }
 295 #endif
 296
 297 static void __init reserve_brk(void)
 298 {
 299         if (_brk_end > _brk_start)
 300                 reserve_early(__pa(_brk_start), __pa(_brk_end), "BRK");
 301
 302         /* Mark brk area as locked down and no longer taking any
 303            new allocations */
 304         _brk_start = 0;
 305 }
 306
 307 #ifdef CONFIG_BLK_DEV_INITRD
 308
 309 #define MAX_MAP_CHUNK   (NR_FIX_BTMAPS << PAGE_SHIFT)
 310 static void __init relocate_initrd(void)
 311 {
 312
 313         u64 ramdisk_image = boot_params.hdr.ramdisk_image;
 314         u64 ramdisk_size  = boot_params.hdr.ramdisk_size;
 315         u64 end_of_lowmem = max_low_pfn_mapped << PAGE_SHIFT;
 316         u64 ramdisk_here;
 317         unsigned long slop, clen, mapaddr;
 318         char *p, *q;
 319
 320         /* We need to move the initrd down into lowmem */
 321         ramdisk_here = find_e820_area(0, end_of_lowmem, ramdisk_size,
 322                                          PAGE_SIZE);
 323
 324         if (ramdisk_here == -1ULL)
 325                 panic("Cannot find place for new RAMDISK of size %lld\n",
 326                          ramdisk_size);
 327
 328         /* Note: this includes all the lowmem currently occupied by
 329            the initrd, we rely on that fact to keep the data intact. */
 330         reserve_early(ramdisk_here, ramdisk_here + ramdisk_size,
 331                          "NEW RAMDISK");
 332         initrd_start = ramdisk_here + PAGE_OFFSET;
 333         initrd_end   = initrd_start + ramdisk_size;
 334         printk(KERN_INFO "Allocated new RAMDISK: %08llx - %08llx\n",
 335                          ramdisk_here, ramdisk_here + ramdisk_size);
 336
 337         q = (char *)initrd_start;
 338
 339         /* Copy any lowmem portion of the initrd */
 340         if (ramdisk_image < end_of_lowmem) {
 341                 clen = end_of_lowmem - ramdisk_image;
 342                 p = (char *)__va(ramdisk_image);
 343                 memcpy(q, p, clen);
 344                 q += clen;
 345                 ramdisk_image += clen;
 346                 ramdisk_size  -= clen;
 347         }
 348
 349         /* Copy the highmem portion of the initrd */
 350         while (ramdisk_size) {
 351                 slop = ramdisk_image & ~PAGE_MASK;
 352                 clen = ramdisk_size;
 353                 if (clen > MAX_MAP_CHUNK-slop)
 354                         clen = MAX_MAP_CHUNK-slop;
 355                 mapaddr = ramdisk_image & PAGE_MASK;
 356                 p = early_memremap(mapaddr, clen+slop);
 357                 memcpy(q, p+slop, clen);
 358                 early_iounmap(p, clen+slop);
 359                 q += clen;
 360                 ramdisk_image += clen;
 361                 ramdisk_size  -= clen;
 362         }
 363         /* high pages is not converted by early_res_to_bootmem */
 364         ramdisk_image = boot_params.hdr.ramdisk_image;
 365         ramdisk_size  = boot_params.hdr.ramdisk_size;
 366         printk(KERN_INFO "Move RAMDISK from %016llx - %016llx to"
 367                 " %08llx - %08llx\n",
 368                 ramdisk_image, ramdisk_image + ramdisk_size - 1,
 369                 ramdisk_here, ramdisk_here + ramdisk_size - 1);
 370 }
 371
 372 static void __init reserve_initrd(void)
 373 {
 374         u64 ramdisk_image = boot_params.hdr.ramdisk_image;
 375         u64 ramdisk_size  = boot_params.hdr.ramdisk_size;
 376         u64 ramdisk_end   = ramdisk_image + ramdisk_size;
 377         u64 end_of_lowmem = max_low_pfn_mapped << PAGE_SHIFT;
 378
 379         if (!boot_params.hdr.type_of_loader ||
 380             !ramdisk_image || !ramdisk_size)
 381                 return;         /* No initrd provided by bootloader */
 382
 383         initrd_start = 0;
 384
 385         if (ramdisk_size >= (end_of_lowmem>>1)) {
 386                 free_early(ramdisk_image, ramdisk_end);
 387                 printk(KERN_ERR "initrd too large to handle, "
 388                        "disabling initrd\n");
 389                 return;
 390         }
 391
 392         printk(KERN_INFO "RAMDISK: %08llx - %08llx\n", ramdisk_image,
 393                         ramdisk_end);
 394
 395
 396         if (ramdisk_end <= end_of_lowmem) {
 397                 /* All in lowmem, easy case */
 398                 /*
 399                  * don't need to reserve again, already reserved early
 400                  * in i386_start_kernel
 401                  */
 402                 initrd_start = ramdisk_image + PAGE_OFFSET;
 403                 initrd_end = initrd_start + ramdisk_size;
 404                 return;
 405         }
 406
 407         relocate_initrd();
 408
 409         free_early(ramdisk_image, ramdisk_end);
 410 }
 411 #else
 412 static void __init reserve_initrd(void)
 413 {
 414 }
 415 #endif /* CONFIG_BLK_DEV_INITRD */
 416
 417 static void __init parse_setup_data(void)
 418 {
 419         struct setup_data *data;
 420         u64 pa_data;
 421
 422         if (boot_params.hdr.version < 0x0209)
 423                 return;
 424         pa_data = boot_params.hdr.setup_data;
 425         while (pa_data) {
 426                 data = early_memremap(pa_data, PAGE_SIZE);
 427                 switch (data->type) {
 428                 case SETUP_E820_EXT:
 429                         parse_e820_ext(data, pa_data);
 430                         break;
 431                 default:
 432                         break;
 433                 }
 434                 pa_data = data->next;
 435                 early_iounmap(data, PAGE_SIZE);
 436         }
 437 }
 438
 439 static void __init e820_reserve_setup_data(void)
 440 {
 441         struct setup_data *data;
 442         u64 pa_data;
 443         int found = 0;
 444
 445         if (boot_params.hdr.version < 0x0209)
 446                 return;
 447         pa_data = boot_params.hdr.setup_data;
 448         while (pa_data) {
 449                 data = early_memremap(pa_data, sizeof(*data));
 450                 e820_update_range(pa_data, sizeof(*data)+data->len,
 451                          E820_RAM, E820_RESERVED_KERN);
 452                 found = 1;
 453                 pa_data = data->next;
 454                 early_iounmap(data, sizeof(*data));
 455         }
 456         if (!found)
 457                 return;
 458
 459         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 460         memcpy(&e820_saved, &e820, sizeof(struct e820map));
 461         printk(KERN_INFO "extended physical RAM map:\n");
 462         e820_print_map("reserve setup_data");
 463 }
 464
 465 static void __init reserve_early_setup_data(void)
 466 {
 467         struct setup_data *data;
 468         u64 pa_data;
 469         char buf[32];
 470
 471         if (boot_params.hdr.version < 0x0209)
 472                 return;
 473         pa_data = boot_params.hdr.setup_data;
 474         while (pa_data) {
 475                 data = early_memremap(pa_data, sizeof(*data));
 476                 sprintf(buf, "setup data %x", data->type);
 477                 reserve_early(pa_data, pa_data+sizeof(*data)+data->len, buf);
 478                 pa_data = data->next;
 479                 early_iounmap(data, sizeof(*data));
 480         }
 481 }
 482
 483 /*
 484  * --------- Crashkernel reservation ------------------------------
 485  */
 486
 487 #ifdef CONFIG_KEXEC
 488
 489 /**
 490  * Reserve @size bytes of crashkernel memory at any suitable offset.
 491  *
 492  * @size: Size of the crashkernel memory to reserve.
 493  * Returns the base address on success, and -1ULL on failure.
 494  */
 495 static
 496 unsigned long long __init find_and_reserve_crashkernel(unsigned long long size)
 497 {
 498         const unsigned long long alignment = 16<<20;    /* 16M */
 499         unsigned long long start = 0LL;
 500
 501         while (1) {
 502                 int ret;
 503
 504                 start = find_e820_area(start, ULONG_MAX, size, alignment);
 505                 if (start == -1ULL)
 506                         return start;
 507
 508                 /* try to reserve it */
 509                 ret = reserve_bootmem_generic(start, size, BOOTMEM_EXCLUSIVE);
 510                 if (ret >= 0)
 511                         return start;
 512
 513                 start += alignment;
 514         }
 515 }
 516
 517 static inline unsigned long long get_total_mem(void)
 518 {
 519         unsigned long long total;
 520
 521         total = max_low_pfn - min_low_pfn;
 522 #ifdef CONFIG_HIGHMEM
 523         total += highend_pfn - highstart_pfn;
 524 #endif
 525
 526         return total << PAGE_SHIFT;
 527 }
 528
 529 static void __init reserve_crashkernel(void)
 530 {
 531         unsigned long long total_mem;
 532         unsigned long long crash_size, crash_base;
 533         int ret;
 534
 535         total_mem = get_total_mem();
 536
 537         ret = parse_crashkernel(boot_command_line, total_mem,
 538                         &crash_size, &crash_base);
 539         if (ret != 0 || crash_size <= 0)
 540                 return;
 541
 542         /* 0 means: find the address automatically */
 543         if (crash_base <= 0) {
 544                 crash_base = find_and_reserve_crashkernel(crash_size);
 545                 if (crash_base == -1ULL) {
 546                         pr_info("crashkernel reservation failed. "
 547                                 "No suitable area found.\n");
 548                         return;
 549                 }
 550         } else {
 551                 ret = reserve_bootmem_generic(crash_base, crash_size,
 552                                         BOOTMEM_EXCLUSIVE);
 553                 if (ret < 0) {
 554                         pr_info("crashkernel reservation failed - "
 555                                 "memory is in use\n");
 556                         return;
 557                 }
 558         }
 559
 560         printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
 561                         "for crashkernel (System RAM: %ldMB)\n",
 562                         (unsigned long)(crash_size >> 20),
 563                         (unsigned long)(crash_base >> 20),
 564                         (unsigned long)(total_mem >> 20));
 565
 566         crashk_res.start = crash_base;
 567         crashk_res.end   = crash_base + crash_size - 1;
 568         insert_resource(&iomem_resource, &crashk_res);
 569 }
 570 #else
 571 static void __init reserve_crashkernel(void)
 572 {
 573 }
 574 #endif
 575
 576 static struct resource standard_io_resources[] = {
 577         { .name = "dma1", .start = 0x00, .end = 0x1f,
 578                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 579         { .name = "pic1", .start = 0x20, .end = 0x21,
 580                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 581         { .name = "timer0", .start = 0x40, .end = 0x43,
 582                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 583         { .name = "timer1", .start = 0x50, .end = 0x53,
 584                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 585         { .name = "keyboard", .start = 0x60, .end = 0x60,
 586                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 587         { .name = "keyboard", .start = 0x64, .end = 0x64,
 588                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 589         { .name = "dma page reg", .start = 0x80, .end = 0x8f,
 590                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 591         { .name = "pic2", .start = 0xa0, .end = 0xa1,
 592                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 593         { .name = "dma2", .start = 0xc0, .end = 0xdf,
 594                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 595         { .name = "fpu", .start = 0xf0, .end = 0xff,
 596                 .flags = IORESOURCE_BUSY | IORESOURCE_IO }
 597 };
 598
 599 void __init reserve_standard_io_resources(void)
 600 {
 601         int i;
 602
 603         /* request I/O space for devices used on all i[345]86 PCs */
 604         for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
 605                 request_resource(&ioport_resource, &standard_io_resources[i]);
 606
 607 }
 608
 609 /*
 610  * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
 611  * is_kdump_kernel() to determine if we are booting after a panic. Hence
 612  * ifdef it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
 613  */
 614
 615 #ifdef CONFIG_CRASH_DUMP
 616 /* elfcorehdr= specifies the location of elf core header
 617  * stored by the crashed kernel. This option will be passed
 618  * by kexec loader to the capture kernel.
 619  */
 620 static int __init setup_elfcorehdr(char *arg)
 621 {
 622         char *end;
 623         if (!arg)
 624                 return -EINVAL;
 625         elfcorehdr_addr = memparse(arg, &end);
 626         return end > arg ? 0 : -EINVAL;
 627 }
 628 early_param("elfcorehdr", setup_elfcorehdr);
 629 #endif
 630
 631 #ifdef CONFIG_X86_RESERVE_LOW_64K
 632 static int __init dmi_low_memory_corruption(const struct dmi_system_id *d)
 633 {
 634         printk(KERN_NOTICE
 635                 "%s detected: BIOS may corrupt low RAM, working around it.\n",
 636                 d->ident);
 637
 638         e820_update_range(0, 0x10000, E820_RAM, E820_RESERVED);
 639         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 640
 641         return 0;
 642 }
 643 #endif
 644
 645 /* List of systems that have known low memory corruption BIOS problems */
 646 static struct dmi_system_id __initdata bad_bios_dmi_table[] = {
 647 #ifdef CONFIG_X86_RESERVE_LOW_64K
 648         {
 649                 .callback = dmi_low_memory_corruption,
 650                 .ident = "AMI BIOS",
 651                 .matches = {
 652                         DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
 653                 },
 654         },
 655         {
 656                 .callback = dmi_low_memory_corruption,
 657                 .ident = "Phoenix BIOS",
 658                 .matches = {
 659                         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies"),
 660                 },
 661         },
 662         {
 663         /*
 664          * AMI BIOS with low memory corruption was found on Intel DG45ID board.
 665          * It hase different DMI_BIOS_VENDOR = "Intel Corp.", for now we will
 666          * match only DMI_BOARD_NAME and see if there is more bad products
 667          * with this vendor.
 668          */
 669                 .callback = dmi_low_memory_corruption,
 670                 .ident = "AMI BIOS",
 671                 .matches = {
 672                         DMI_MATCH(DMI_BOARD_NAME, "DG45ID"),
 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         x86_init.oem.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 #ifdef CONFIG_X86_64
 787         /*
 788          * Must call this twice: Once just to detect whether hardware doesn't
 789          * support NX (so that the early EHCI debug console setup can safely
 790          * call set_fixmap(), and then again after parsing early parameters to
 791          * honor the respective command line option.
 792          */
 793         check_efer();
 794 #endif
 795
 796         parse_early_param();
 797
 798 #ifdef CONFIG_X86_64
 799         check_efer();
 800 #endif
 801
 802         /* Must be before kernel pagetables are setup */
 803         vmi_activate();
 804
 805         /* after early param, so could get panic from serial */
 806         reserve_early_setup_data();
 807
 808         if (acpi_mps_check()) {
 809 #ifdef CONFIG_X86_LOCAL_APIC
 810                 disable_apic = 1;
 811 #endif
 812                 setup_clear_cpu_cap(X86_FEATURE_APIC);
 813         }
 814
 815 #ifdef CONFIG_PCI
 816         if (pci_early_dump_regs)
 817                 early_dump_pci_devices();
 818 #endif
 819
 820         finish_e820_parsing();
 821
 822         if (efi_enabled)
 823                 efi_init();
 824
 825         dmi_scan_machine();
 826
 827         dmi_check_system(bad_bios_dmi_table);
 828
 829         /*
 830          * VMware detection requires dmi to be available, so this
 831          * needs to be done after dmi_scan_machine, for the BP.
 832          */
 833         init_hypervisor_platform();
 834
 835         x86_init.resources.probe_roms();
 836
 837         /* after parse_early_param, so could debug it */
 838         insert_resource(&iomem_resource, &code_resource);
 839         insert_resource(&iomem_resource, &data_resource);
 840         insert_resource(&iomem_resource, &bss_resource);
 841
 842
 843 #ifdef CONFIG_X86_32
 844         if (ppro_with_ram_bug()) {
 845                 e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM,
 846                                   E820_RESERVED);
 847                 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 848                 printk(KERN_INFO "fixed physical RAM map:\n");
 849                 e820_print_map("bad_ppro");
 850         }
 851 #else
 852         early_gart_iommu_check();
 853 #endif
 854
 855         /*
 856          * partially used pages are not usable - thus
 857          * we are rounding upwards:
 858          */
 859         max_pfn = e820_end_of_ram_pfn();
 860
 861         /* preallocate 4k for mptable mpc */
 862         early_reserve_e820_mpc_new();
 863         /* update e820 for memory not covered by WB MTRRs */
 864         mtrr_bp_init();
 865         if (mtrr_trim_uncached_memory(max_pfn))
 866                 max_pfn = e820_end_of_ram_pfn();
 867
 868 #ifdef CONFIG_X86_32
 869         /* max_low_pfn get updated here */
 870         find_low_pfn_range();
 871 #else
 872         num_physpages = max_pfn;
 873
 874         check_x2apic();
 875
 876         /* How many end-of-memory variables you have, grandma! */
 877         /* need this before calling reserve_initrd */
 878         if (max_pfn > (1UL<<(32 - PAGE_SHIFT)))
 879                 max_low_pfn = e820_end_of_low_ram_pfn();
 880         else
 881                 max_low_pfn = max_pfn;
 882
 883         high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
 884         max_pfn_mapped = KERNEL_IMAGE_SIZE >> PAGE_SHIFT;
 885 #endif
 886
 887 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
 888         setup_bios_corruption_check();
 889 #endif
 890
 891         printk(KERN_DEBUG "initial memory mapped : 0 - %08lx\n",
 892                         max_pfn_mapped<<PAGE_SHIFT);
 893
 894         reserve_brk();
 895
 896         init_gbpages();
 897
 898         /* max_pfn_mapped is updated here */
 899         max_low_pfn_mapped = init_memory_mapping(0, max_low_pfn<<PAGE_SHIFT);
 900         max_pfn_mapped = max_low_pfn_mapped;
 901
 902 #ifdef CONFIG_X86_64
 903         if (max_pfn > max_low_pfn) {
 904                 max_pfn_mapped = init_memory_mapping(1UL<<32,
 905                                                      max_pfn<<PAGE_SHIFT);
 906                 /* can we preseve max_low_pfn ?*/
 907                 max_low_pfn = max_pfn;
 908         }
 909 #endif
 910
 911         /*
 912          * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
 913          */
 914
 915 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
 916         if (init_ohci1394_dma_early)
 917                 init_ohci1394_dma_on_all_controllers();
 918 #endif
 919
 920         reserve_initrd();
 921
 922         vsmp_init();
 923
 924         io_delay_init();
 925
 926         /*
 927          * Parse the ACPI tables for possible boot-time SMP configuration.
 928          */
 929         acpi_boot_table_init();
 930
 931         early_acpi_boot_init();
 932
 933 #ifdef CONFIG_ACPI_NUMA
 934         /*
 935          * Parse SRAT to discover nodes.
 936          */
 937         acpi_numa_init();
 938 #endif
 939
 940         initmem_init(0, max_pfn);
 941
 942 #ifdef CONFIG_ACPI_SLEEP
 943         /*
 944          * Reserve low memory region for sleep support.
 945          */
 946         acpi_reserve_bootmem();
 947 #endif
 948         /*
 949          * Find and reserve possible boot-time SMP configuration:
 950          */
 951         find_smp_config();
 952
 953         reserve_crashkernel();
 954
 955 #ifdef CONFIG_X86_64
 956         /*
 957          * dma32_reserve_bootmem() allocates bootmem which may conflict
 958          * with the crashkernel command line, so do that after
 959          * reserve_crashkernel()
 960          */
 961         dma32_reserve_bootmem();
 962 #endif
 963
 964         reserve_ibft_region();
 965
 966 #ifdef CONFIG_KVM_CLOCK
 967         kvmclock_init();
 968 #endif
 969
 970         x86_init.paging.pagetable_setup_start(swapper_pg_dir);
 971         paging_init();
 972         x86_init.paging.pagetable_setup_done(swapper_pg_dir);
 973
 974         tboot_probe();
 975
 976 #ifdef CONFIG_X86_64
 977         map_vsyscall();
 978 #endif
 979
 980         generic_apic_probe();
 981
 982         early_quirks();
 983
 984         /*
 985          * Read APIC and some other early information from ACPI tables.
 986          */
 987         acpi_boot_init();
 988
 989         sfi_init();
 990
 991         /*
 992          * get boot-time SMP configuration:
 993          */
 994         if (smp_found_config)
 995                 get_smp_config();
 996
 997         prefill_possible_map();
 998
 999 #ifdef CONFIG_X86_64
1000         init_cpu_to_node();
1001 #endif
1002
1003         init_apic_mappings();
1004         ioapic_init_mappings();
1005
1006         /* need to wait for io_apic is mapped */
1007         probe_nr_irqs_gsi();
1008
1009         kvm_guest_init();
1010
1011         e820_reserve_resources();
1012         e820_mark_nosave_regions(max_low_pfn);
1013
1014         x86_init.resources.reserve_resources();
1015
1016         e820_setup_gap();
1017
1018 #ifdef CONFIG_VT
1019 #if defined(CONFIG_VGA_CONSOLE)
1020         if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
1021                 conswitchp = &vga_con;
1022 #elif defined(CONFIG_DUMMY_CONSOLE)
1023         conswitchp = &dummy_con;
1024 #endif
1025 #endif
1026         x86_init.oem.banner();
1027 }
1028
1029 #ifdef CONFIG_X86_32
1030
1031 static struct resource video_ram_resource = {
1032         .name   = "Video RAM area",
1033         .start  = 0xa0000,
1034         .end    = 0xbffff,
1035         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
1036 };
1037
1038 void __init i386_reserve_resources(void)
1039 {
1040         request_resource(&iomem_resource, &video_ram_resource);
1041         reserve_standard_io_resources();
1042 }
1043
1044 #endif /* CONFIG_X86_32 */