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/user.h>
  59 #include <linux/delay.h>
  60
  61 #include <linux/kallsyms.h>
  62 #include <linux/cpufreq.h>
  63 #include <linux/dma-mapping.h>
  64 #include <linux/ctype.h>
  65 #include <linux/uaccess.h>
  66
  67 #include <linux/percpu.h>
  68 #include <linux/crash_dump.h>
  69 #include <linux/tboot.h>
  70
  71 #include <video/edid.h>
  72
  73 #include <asm/mtrr.h>
  74 #include <asm/apic.h>
  75 #include <asm/trampoline.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 #include <asm/k8.h>
 110 #ifdef CONFIG_X86_64
 111 #include <asm/numa_64.h>
 112 #endif
 113 #include <asm/mce.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 #ifdef CONFIG_DMI
 124 RESERVE_BRK(dmi_alloc, 65536);
 125 #endif
 126
 127 unsigned int boot_cpu_id __read_mostly;
 128
 129 static __initdata unsigned long _brk_start = (unsigned long)__brk_base;
 130 unsigned long _brk_end = (unsigned long)__brk_base;
 131
 132 #ifdef CONFIG_X86_64
 133 int default_cpu_present_to_apicid(int mps_cpu)
 134 {
 135         return __default_cpu_present_to_apicid(mps_cpu);
 136 }
 137
 138 int default_check_phys_apicid_present(int phys_apicid)
 139 {
 140         return __default_check_phys_apicid_present(phys_apicid);
 141 }
 142 #endif
 143
 144 #ifndef CONFIG_DEBUG_BOOT_PARAMS
 145 struct boot_params __initdata boot_params;
 146 #else
 147 struct boot_params boot_params;
 148 #endif
 149
 150 /*
 151  * Machine setup..
 152  */
 153 static struct resource data_resource = {
 154         .name   = "Kernel data",
 155         .start  = 0,
 156         .end    = 0,
 157         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 158 };
 159
 160 static struct resource code_resource = {
 161         .name   = "Kernel code",
 162         .start  = 0,
 163         .end    = 0,
 164         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 165 };
 166
 167 static struct resource bss_resource = {
 168         .name   = "Kernel bss",
 169         .start  = 0,
 170         .end    = 0,
 171         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 172 };
 173
 174
 175 #ifdef CONFIG_X86_32
 176 /* cpu data as detected by the assembly code in head.S */
 177 struct cpuinfo_x86 new_cpu_data __cpuinitdata = {0, 0, 0, 0, -1, 1, 0, 0, -1};
 178 /* common cpu data for all cpus */
 179 struct cpuinfo_x86 boot_cpu_data __read_mostly = {0, 0, 0, 0, -1, 1, 0, 0, -1};
 180 EXPORT_SYMBOL(boot_cpu_data);
 181 static void set_mca_bus(int x)
 182 {
 183 #ifdef CONFIG_MCA
 184         MCA_bus = x;
 185 #endif
 186 }
 187
 188 unsigned int def_to_bigsmp;
 189
 190 /* for MCA, but anyone else can use it if they want */
 191 unsigned int machine_id;
 192 unsigned int machine_submodel_id;
 193 unsigned int BIOS_revision;
 194
 195 struct apm_info apm_info;
 196 EXPORT_SYMBOL(apm_info);
 197
 198 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
 199         defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
 200 struct ist_info ist_info;
 201 EXPORT_SYMBOL(ist_info);
 202 #else
 203 struct ist_info ist_info;
 204 #endif
 205
 206 #else
 207 struct cpuinfo_x86 boot_cpu_data __read_mostly = {
 208         .x86_phys_bits = MAX_PHYSMEM_BITS,
 209 };
 210 EXPORT_SYMBOL(boot_cpu_data);
 211 #endif
 212
 213
 214 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
 215 unsigned long mmu_cr4_features;
 216 #else
 217 unsigned long mmu_cr4_features = X86_CR4_PAE;
 218 #endif
 219
 220 /* Boot loader ID and version as integers, for the benefit of proc_dointvec */
 221 int bootloader_type, bootloader_version;
 222
 223 /*
 224  * Setup options
 225  */
 226 struct screen_info screen_info;
 227 EXPORT_SYMBOL(screen_info);
 228 struct edid_info edid_info;
 229 EXPORT_SYMBOL_GPL(edid_info);
 230
 231 extern int root_mountflags;
 232
 233 unsigned long saved_video_mode;
 234
 235 #define RAMDISK_IMAGE_START_MASK        0x07FF
 236 #define RAMDISK_PROMPT_FLAG             0x8000
 237 #define RAMDISK_LOAD_FLAG               0x4000
 238
 239 static char __initdata command_line[COMMAND_LINE_SIZE];
 240 #ifdef CONFIG_CMDLINE_BOOL
 241 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
 242 #endif
 243
 244 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
 245 struct edd edd;
 246 #ifdef CONFIG_EDD_MODULE
 247 EXPORT_SYMBOL(edd);
 248 #endif
 249 /**
 250  * copy_edd() - Copy the BIOS EDD information
 251  *              from boot_params into a safe place.
 252  *
 253  */
 254 static inline void __init copy_edd(void)
 255 {
 256      memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
 257             sizeof(edd.mbr_signature));
 258      memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
 259      edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
 260      edd.edd_info_nr = boot_params.eddbuf_entries;
 261 }
 262 #else
 263 static inline void __init copy_edd(void)
 264 {
 265 }
 266 #endif
 267
 268 void * __init extend_brk(size_t size, size_t align)
 269 {
 270         size_t mask = align - 1;
 271         void *ret;
 272
 273         BUG_ON(_brk_start == 0);
 274         BUG_ON(align & mask);
 275
 276         _brk_end = (_brk_end + mask) & ~mask;
 277         BUG_ON((char *)(_brk_end + size) > __brk_limit);
 278
 279         ret = (void *)_brk_end;
 280         _brk_end += size;
 281
 282         memset(ret, 0, size);
 283
 284         return ret;
 285 }
 286
 287 #ifdef CONFIG_X86_64
 288 static void __init init_gbpages(void)
 289 {
 290         if (direct_gbpages && cpu_has_gbpages)
 291                 printk(KERN_INFO "Using GB pages for direct mapping\n");
 292         else
 293                 direct_gbpages = 0;
 294 }
 295 #else
 296 static inline void init_gbpages(void)
 297 {
 298 }
 299 #endif
 300
 301 static void __init reserve_brk(void)
 302 {
 303         if (_brk_end > _brk_start)
 304                 reserve_early(__pa(_brk_start), __pa(_brk_end), "BRK");
 305
 306         /* Mark brk area as locked down and no longer taking any
 307            new allocations */
 308         _brk_start = 0;
 309 }
 310
 311 #ifdef CONFIG_BLK_DEV_INITRD
 312
 313 #define MAX_MAP_CHUNK   (NR_FIX_BTMAPS << PAGE_SHIFT)
 314 static void __init relocate_initrd(void)
 315 {
 316         /* Assume only end is not page aligned */
 317         u64 ramdisk_image = boot_params.hdr.ramdisk_image;
 318         u64 ramdisk_size  = boot_params.hdr.ramdisk_size;
 319         u64 area_size     = PAGE_ALIGN(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, area_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 + area_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         /* Assume only end is not page aligned */
 380         u64 ramdisk_image = boot_params.hdr.ramdisk_image;
 381         u64 ramdisk_size  = boot_params.hdr.ramdisk_size;
 382         u64 ramdisk_end   = PAGE_ALIGN(ramdisk_image + ramdisk_size);
 383         u64 end_of_lowmem = max_low_pfn_mapped << PAGE_SHIFT;
 384
 385         if (!boot_params.hdr.type_of_loader ||
 386             !ramdisk_image || !ramdisk_size)
 387                 return;         /* No initrd provided by bootloader */
 388
 389         initrd_start = 0;
 390
 391         if (ramdisk_size >= (end_of_lowmem>>1)) {
 392                 free_early(ramdisk_image, ramdisk_end);
 393                 printk(KERN_ERR "initrd too large to handle, "
 394                        "disabling initrd\n");
 395                 return;
 396         }
 397
 398         printk(KERN_INFO "RAMDISK: %08llx - %08llx\n", ramdisk_image,
 399                         ramdisk_end);
 400
 401
 402         if (ramdisk_end <= end_of_lowmem) {
 403                 /* All in lowmem, easy case */
 404                 /*
 405                  * don't need to reserve again, already reserved early
 406                  * in i386_start_kernel
 407                  */
 408                 initrd_start = ramdisk_image + PAGE_OFFSET;
 409                 initrd_end = initrd_start + ramdisk_size;
 410                 return;
 411         }
 412
 413         relocate_initrd();
 414
 415         free_early(ramdisk_image, ramdisk_end);
 416 }
 417 #else
 418 static void __init reserve_initrd(void)
 419 {
 420 }
 421 #endif /* CONFIG_BLK_DEV_INITRD */
 422
 423 static void __init parse_setup_data(void)
 424 {
 425         struct setup_data *data;
 426         u64 pa_data;
 427
 428         if (boot_params.hdr.version < 0x0209)
 429                 return;
 430         pa_data = boot_params.hdr.setup_data;
 431         while (pa_data) {
 432                 data = early_memremap(pa_data, PAGE_SIZE);
 433                 switch (data->type) {
 434                 case SETUP_E820_EXT:
 435                         parse_e820_ext(data, pa_data);
 436                         break;
 437                 default:
 438                         break;
 439                 }
 440                 pa_data = data->next;
 441                 early_iounmap(data, PAGE_SIZE);
 442         }
 443 }
 444
 445 static void __init e820_reserve_setup_data(void)
 446 {
 447         struct setup_data *data;
 448         u64 pa_data;
 449         int found = 0;
 450
 451         if (boot_params.hdr.version < 0x0209)
 452                 return;
 453         pa_data = boot_params.hdr.setup_data;
 454         while (pa_data) {
 455                 data = early_memremap(pa_data, sizeof(*data));
 456                 e820_update_range(pa_data, sizeof(*data)+data->len,
 457                          E820_RAM, E820_RESERVED_KERN);
 458                 found = 1;
 459                 pa_data = data->next;
 460                 early_iounmap(data, sizeof(*data));
 461         }
 462         if (!found)
 463                 return;
 464
 465         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 466         memcpy(&e820_saved, &e820, sizeof(struct e820map));
 467         printk(KERN_INFO "extended physical RAM map:\n");
 468         e820_print_map("reserve setup_data");
 469 }
 470
 471 static void __init reserve_early_setup_data(void)
 472 {
 473         struct setup_data *data;
 474         u64 pa_data;
 475         char buf[32];
 476
 477         if (boot_params.hdr.version < 0x0209)
 478                 return;
 479         pa_data = boot_params.hdr.setup_data;
 480         while (pa_data) {
 481                 data = early_memremap(pa_data, sizeof(*data));
 482                 sprintf(buf, "setup data %x", data->type);
 483                 reserve_early(pa_data, pa_data+sizeof(*data)+data->len, buf);
 484                 pa_data = data->next;
 485                 early_iounmap(data, sizeof(*data));
 486         }
 487 }
 488
 489 /*
 490  * --------- Crashkernel reservation ------------------------------
 491  */
 492
 493 #ifdef CONFIG_KEXEC
 494
 495 static inline unsigned long long get_total_mem(void)
 496 {
 497         unsigned long long total;
 498
 499         total = max_pfn - min_low_pfn;
 500
 501         return total << PAGE_SHIFT;
 502 }
 503
 504 static void __init reserve_crashkernel(void)
 505 {
 506         unsigned long long total_mem;
 507         unsigned long long crash_size, crash_base;
 508         int ret;
 509
 510         total_mem = get_total_mem();
 511
 512         ret = parse_crashkernel(boot_command_line, total_mem,
 513                         &crash_size, &crash_base);
 514         if (ret != 0 || crash_size <= 0)
 515                 return;
 516
 517         /* 0 means: find the address automatically */
 518         if (crash_base <= 0) {
 519                 const unsigned long long alignment = 16<<20;    /* 16M */
 520
 521                 crash_base = find_e820_area(alignment, ULONG_MAX, crash_size,
 522                                  alignment);
 523                 if (crash_base == -1ULL) {
 524                         pr_info("crashkernel reservation failed - No suitable area found.\n");
 525                         return;
 526                 }
 527         } else {
 528                 unsigned long long start;
 529
 530                 start = find_e820_area(crash_base, ULONG_MAX, crash_size,
 531                                  1<<20);
 532                 if (start != crash_base) {
 533                         pr_info("crashkernel reservation failed - memory is in use.\n");
 534                         return;
 535                 }
 536         }
 537         reserve_early(crash_base, crash_base + crash_size, "CRASH KERNEL");
 538
 539         printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
 540                         "for crashkernel (System RAM: %ldMB)\n",
 541                         (unsigned long)(crash_size >> 20),
 542                         (unsigned long)(crash_base >> 20),
 543                         (unsigned long)(total_mem >> 20));
 544
 545         crashk_res.start = crash_base;
 546         crashk_res.end   = crash_base + crash_size - 1;
 547         insert_resource(&iomem_resource, &crashk_res);
 548 }
 549 #else
 550 static void __init reserve_crashkernel(void)
 551 {
 552 }
 553 #endif
 554
 555 static struct resource standard_io_resources[] = {
 556         { .name = "dma1", .start = 0x00, .end = 0x1f,
 557                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 558         { .name = "pic1", .start = 0x20, .end = 0x21,
 559                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 560         { .name = "timer0", .start = 0x40, .end = 0x43,
 561                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 562         { .name = "timer1", .start = 0x50, .end = 0x53,
 563                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 564         { .name = "keyboard", .start = 0x60, .end = 0x60,
 565                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 566         { .name = "keyboard", .start = 0x64, .end = 0x64,
 567                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 568         { .name = "dma page reg", .start = 0x80, .end = 0x8f,
 569                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 570         { .name = "pic2", .start = 0xa0, .end = 0xa1,
 571                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 572         { .name = "dma2", .start = 0xc0, .end = 0xdf,
 573                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 574         { .name = "fpu", .start = 0xf0, .end = 0xff,
 575                 .flags = IORESOURCE_BUSY | IORESOURCE_IO }
 576 };
 577
 578 void __init reserve_standard_io_resources(void)
 579 {
 580         int i;
 581
 582         /* request I/O space for devices used on all i[345]86 PCs */
 583         for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
 584                 request_resource(&ioport_resource, &standard_io_resources[i]);
 585
 586 }
 587
 588 /*
 589  * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
 590  * is_kdump_kernel() to determine if we are booting after a panic. Hence
 591  * ifdef it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
 592  */
 593
 594 #ifdef CONFIG_CRASH_DUMP
 595 /* elfcorehdr= specifies the location of elf core header
 596  * stored by the crashed kernel. This option will be passed
 597  * by kexec loader to the capture kernel.
 598  */
 599 static int __init setup_elfcorehdr(char *arg)
 600 {
 601         char *end;
 602         if (!arg)
 603                 return -EINVAL;
 604         elfcorehdr_addr = memparse(arg, &end);
 605         return end > arg ? 0 : -EINVAL;
 606 }
 607 early_param("elfcorehdr", setup_elfcorehdr);
 608 #endif
 609
 610 static __init void reserve_ibft_region(void)
 611 {
 612         unsigned long addr, size = 0;
 613
 614         addr = find_ibft_region(&size);
 615
 616         if (size)
 617                 reserve_early_overlap_ok(addr, addr + size, "ibft");
 618 }
 619
 620 #ifdef CONFIG_X86_RESERVE_LOW_64K
 621 static int __init dmi_low_memory_corruption(const struct dmi_system_id *d)
 622 {
 623         printk(KERN_NOTICE
 624                 "%s detected: BIOS may corrupt low RAM, working around it.\n",
 625                 d->ident);
 626
 627         e820_update_range(0, 0x10000, E820_RAM, E820_RESERVED);
 628         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 629
 630         return 0;
 631 }
 632 #endif
 633
 634 /* List of systems that have known low memory corruption BIOS problems */
 635 static struct dmi_system_id __initdata bad_bios_dmi_table[] = {
 636 #ifdef CONFIG_X86_RESERVE_LOW_64K
 637         {
 638                 .callback = dmi_low_memory_corruption,
 639                 .ident = "AMI BIOS",
 640                 .matches = {
 641                         DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
 642                 },
 643         },
 644         {
 645                 .callback = dmi_low_memory_corruption,
 646                 .ident = "Phoenix BIOS",
 647                 .matches = {
 648                         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies"),
 649                 },
 650         },
 651         {
 652                 .callback = dmi_low_memory_corruption,
 653                 .ident = "Phoenix/MSC BIOS",
 654                 .matches = {
 655                         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix/MSC"),
 656                 },
 657         },
 658         /*
 659          * AMI BIOS with low memory corruption was found on Intel DG45ID and
 660          * DG45FC boards.
 661          * It has a different DMI_BIOS_VENDOR = "Intel Corp.", for now we will
 662          * match only DMI_BOARD_NAME and see if there is more bad products
 663          * with this vendor.
 664          */
 665         {
 666                 .callback = dmi_low_memory_corruption,
 667                 .ident = "AMI BIOS",
 668                 .matches = {
 669                         DMI_MATCH(DMI_BOARD_NAME, "DG45ID"),
 670                 },
 671         },
 672         {
 673                 .callback = dmi_low_memory_corruption,
 674                 .ident = "AMI BIOS",
 675                 .matches = {
 676                         DMI_MATCH(DMI_BOARD_NAME, "DG45FC"),
 677                 },
 678         },
 679 #endif
 680         {}
 681 };
 682
 683 static void __init trim_bios_range(void)
 684 {
 685         /*
 686          * A special case is the first 4Kb of memory;
 687          * This is a BIOS owned area, not kernel ram, but generally
 688          * not listed as such in the E820 table.
 689          */
 690         e820_update_range(0, PAGE_SIZE, E820_RAM, E820_RESERVED);
 691         /*
 692          * special case: Some BIOSen report the PC BIOS
 693          * area (640->1Mb) as ram even though it is not.
 694          * take them out.
 695          */
 696         e820_remove_range(BIOS_BEGIN, BIOS_END - BIOS_BEGIN, E820_RAM, 1);
 697         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 698 }
 699
 700 /*
 701  * Determine if we were loaded by an EFI loader.  If so, then we have also been
 702  * passed the efi memmap, systab, etc., so we should use these data structures
 703  * for initialization.  Note, the efi init code path is determined by the
 704  * global efi_enabled. This allows the same kernel image to be used on existing
 705  * systems (with a traditional BIOS) as well as on EFI systems.
 706  */
 707 /*
 708  * setup_arch - architecture-specific boot-time initializations
 709  *
 710  * Note: On x86_64, fixmaps are ready for use even before this is called.
 711  */
 712
 713 void __init setup_arch(char **cmdline_p)
 714 {
 715         int acpi = 0;
 716         int k8 = 0;
 717
 718 #ifdef CONFIG_X86_32
 719         memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
 720         visws_early_detect();
 721 #else
 722         printk(KERN_INFO "Command line: %s\n", boot_command_line);
 723 #endif
 724
 725         /* VMI may relocate the fixmap; do this before touching ioremap area */
 726         vmi_init();
 727
 728         early_cpu_init();
 729         early_ioremap_init();
 730
 731         ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
 732         screen_info = boot_params.screen_info;
 733         edid_info = boot_params.edid_info;
 734 #ifdef CONFIG_X86_32
 735         apm_info.bios = boot_params.apm_bios_info;
 736         ist_info = boot_params.ist_info;
 737         if (boot_params.sys_desc_table.length != 0) {
 738                 set_mca_bus(boot_params.sys_desc_table.table[3] & 0x2);
 739                 machine_id = boot_params.sys_desc_table.table[0];
 740                 machine_submodel_id = boot_params.sys_desc_table.table[1];
 741                 BIOS_revision = boot_params.sys_desc_table.table[2];
 742         }
 743 #endif
 744         saved_video_mode = boot_params.hdr.vid_mode;
 745         bootloader_type = boot_params.hdr.type_of_loader;
 746         if ((bootloader_type >> 4) == 0xe) {
 747                 bootloader_type &= 0xf;
 748                 bootloader_type |= (boot_params.hdr.ext_loader_type+0x10) << 4;
 749         }
 750         bootloader_version  = bootloader_type & 0xf;
 751         bootloader_version |= boot_params.hdr.ext_loader_ver << 4;
 752
 753 #ifdef CONFIG_BLK_DEV_RAM
 754         rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
 755         rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
 756         rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
 757 #endif
 758 #ifdef CONFIG_EFI
 759         if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
 760 #ifdef CONFIG_X86_32
 761                      "EL32",
 762 #else
 763                      "EL64",
 764 #endif
 765          4)) {
 766                 efi_enabled = 1;
 767                 efi_reserve_early();
 768         }
 769 #endif
 770
 771         x86_init.oem.arch_setup();
 772
 773         setup_memory_map();
 774         parse_setup_data();
 775         /* update the e820_saved too */
 776         e820_reserve_setup_data();
 777
 778         copy_edd();
 779
 780         if (!boot_params.hdr.root_flags)
 781                 root_mountflags &= ~MS_RDONLY;
 782         init_mm.start_code = (unsigned long) _text;
 783         init_mm.end_code = (unsigned long) _etext;
 784         init_mm.end_data = (unsigned long) _edata;
 785         init_mm.brk = _brk_end;
 786
 787         code_resource.start = virt_to_phys(_text);
 788         code_resource.end = virt_to_phys(_etext)-1;
 789         data_resource.start = virt_to_phys(_etext);
 790         data_resource.end = virt_to_phys(_edata)-1;
 791         bss_resource.start = virt_to_phys(&__bss_start);
 792         bss_resource.end = virt_to_phys(&__bss_stop)-1;
 793
 794 #ifdef CONFIG_CMDLINE_BOOL
 795 #ifdef CONFIG_CMDLINE_OVERRIDE
 796         strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 797 #else
 798         if (builtin_cmdline[0]) {
 799                 /* append boot loader cmdline to builtin */
 800                 strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE);
 801                 strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE);
 802                 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 803         }
 804 #endif
 805 #endif
 806
 807         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 808         *cmdline_p = command_line;
 809
 810         /*
 811          * x86_configure_nx() is called before parse_early_param() to detect
 812          * whether hardware doesn't support NX (so that the early EHCI debug
 813          * console setup can safely call set_fixmap()). It may then be called
 814          * again from within noexec_setup() during parsing early parameters
 815          * to honor the respective command line option.
 816          */
 817         x86_configure_nx();
 818
 819         parse_early_param();
 820
 821         x86_report_nx();
 822
 823         /* Must be before kernel pagetables are setup */
 824         vmi_activate();
 825
 826         /* after early param, so could get panic from serial */
 827         reserve_early_setup_data();
 828
 829         if (acpi_mps_check()) {
 830 #ifdef CONFIG_X86_LOCAL_APIC
 831                 disable_apic = 1;
 832 #endif
 833                 setup_clear_cpu_cap(X86_FEATURE_APIC);
 834         }
 835
 836 #ifdef CONFIG_PCI
 837         if (pci_early_dump_regs)
 838                 early_dump_pci_devices();
 839 #endif
 840
 841         finish_e820_parsing();
 842
 843         if (efi_enabled)
 844                 efi_init();
 845
 846         dmi_scan_machine();
 847
 848         dmi_check_system(bad_bios_dmi_table);
 849
 850         /*
 851          * VMware detection requires dmi to be available, so this
 852          * needs to be done after dmi_scan_machine, for the BP.
 853          */
 854         init_hypervisor_platform();
 855
 856         x86_init.resources.probe_roms();
 857
 858         /* after parse_early_param, so could debug it */
 859         insert_resource(&iomem_resource, &code_resource);
 860         insert_resource(&iomem_resource, &data_resource);
 861         insert_resource(&iomem_resource, &bss_resource);
 862
 863         trim_bios_range();
 864 #ifdef CONFIG_X86_32
 865         if (ppro_with_ram_bug()) {
 866                 e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM,
 867                                   E820_RESERVED);
 868                 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 869                 printk(KERN_INFO "fixed physical RAM map:\n");
 870                 e820_print_map("bad_ppro");
 871         }
 872 #else
 873         early_gart_iommu_check();
 874 #endif
 875
 876         /*
 877          * partially used pages are not usable - thus
 878          * we are rounding upwards:
 879          */
 880         max_pfn = e820_end_of_ram_pfn();
 881
 882         /* preallocate 4k for mptable mpc */
 883         early_reserve_e820_mpc_new();
 884         /* update e820 for memory not covered by WB MTRRs */
 885         mtrr_bp_init();
 886         if (mtrr_trim_uncached_memory(max_pfn))
 887                 max_pfn = e820_end_of_ram_pfn();
 888
 889 #ifdef CONFIG_X86_32
 890         /* max_low_pfn get updated here */
 891         find_low_pfn_range();
 892 #else
 893         num_physpages = max_pfn;
 894
 895         check_x2apic();
 896
 897         /* How many end-of-memory variables you have, grandma! */
 898         /* need this before calling reserve_initrd */
 899         if (max_pfn > (1UL<<(32 - PAGE_SHIFT)))
 900                 max_low_pfn = e820_end_of_low_ram_pfn();
 901         else
 902                 max_low_pfn = max_pfn;
 903
 904         high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
 905         max_pfn_mapped = KERNEL_IMAGE_SIZE >> PAGE_SHIFT;
 906 #endif
 907
 908 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
 909         setup_bios_corruption_check();
 910 #endif
 911
 912         printk(KERN_DEBUG "initial memory mapped : 0 - %08lx\n",
 913                         max_pfn_mapped<<PAGE_SHIFT);
 914
 915         reserve_brk();
 916
 917         /*
 918          * Find and reserve possible boot-time SMP configuration:
 919          */
 920         find_smp_config();
 921
 922         reserve_ibft_region();
 923
 924         reserve_trampoline_memory();
 925
 926 #ifdef CONFIG_ACPI_SLEEP
 927         /*
 928          * Reserve low memory region for sleep support.
 929          * even before init_memory_mapping
 930          */
 931         acpi_reserve_wakeup_memory();
 932 #endif
 933         init_gbpages();
 934
 935         /* max_pfn_mapped is updated here */
 936         max_low_pfn_mapped = init_memory_mapping(0, max_low_pfn<<PAGE_SHIFT);
 937         max_pfn_mapped = max_low_pfn_mapped;
 938
 939 #ifdef CONFIG_X86_64
 940         if (max_pfn > max_low_pfn) {
 941                 max_pfn_mapped = init_memory_mapping(1UL<<32,
 942                                                      max_pfn<<PAGE_SHIFT);
 943                 /* can we preseve max_low_pfn ?*/
 944                 max_low_pfn = max_pfn;
 945         }
 946 #endif
 947
 948         /*
 949          * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
 950          */
 951
 952 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
 953         if (init_ohci1394_dma_early)
 954                 init_ohci1394_dma_on_all_controllers();
 955 #endif
 956
 957         reserve_initrd();
 958
 959         reserve_crashkernel();
 960
 961         vsmp_init();
 962
 963         io_delay_init();
 964
 965         /*
 966          * Parse the ACPI tables for possible boot-time SMP configuration.
 967          */
 968         acpi_boot_table_init();
 969
 970         early_acpi_boot_init();
 971
 972 #ifdef CONFIG_ACPI_NUMA
 973         /*
 974          * Parse SRAT to discover nodes.
 975          */
 976         acpi = acpi_numa_init();
 977 #endif
 978
 979 #ifdef CONFIG_K8_NUMA
 980         if (!acpi)
 981                 k8 = !k8_numa_init(0, max_pfn);
 982 #endif
 983
 984         initmem_init(0, max_pfn, acpi, k8);
 985 #ifndef CONFIG_NO_BOOTMEM
 986         early_res_to_bootmem(0, max_low_pfn<<PAGE_SHIFT);
 987 #endif
 988
 989         dma32_reserve_bootmem();
 990
 991 #ifdef CONFIG_KVM_CLOCK
 992         kvmclock_init();
 993 #endif
 994
 995         x86_init.paging.pagetable_setup_start(swapper_pg_dir);
 996         paging_init();
 997         x86_init.paging.pagetable_setup_done(swapper_pg_dir);
 998
 999         tboot_probe();
1000
1001 #ifdef CONFIG_X86_64
1002         map_vsyscall();
1003 #endif
1004
1005         generic_apic_probe();
1006
1007         early_quirks();
1008
1009         /*
1010          * Read APIC and some other early information from ACPI tables.
1011          */
1012         acpi_boot_init();
1013
1014         sfi_init();
1015
1016         /*
1017          * get boot-time SMP configuration:
1018          */
1019         if (smp_found_config)
1020                 get_smp_config();
1021
1022         prefill_possible_map();
1023
1024 #ifdef CONFIG_X86_64
1025         init_cpu_to_node();
1026 #endif
1027
1028         init_apic_mappings();
1029         ioapic_init_mappings();
1030
1031         /* need to wait for io_apic is mapped */
1032         probe_nr_irqs_gsi();
1033
1034         kvm_guest_init();
1035
1036         e820_reserve_resources();
1037         e820_mark_nosave_regions(max_low_pfn);
1038
1039         x86_init.resources.reserve_resources();
1040
1041         e820_setup_gap();
1042
1043 #ifdef CONFIG_VT
1044 #if defined(CONFIG_VGA_CONSOLE)
1045         if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
1046                 conswitchp = &vga_con;
1047 #elif defined(CONFIG_DUMMY_CONSOLE)
1048         conswitchp = &dummy_con;
1049 #endif
1050 #endif
1051         x86_init.oem.banner();
1052
1053         mcheck_init();
1054 }
1055
1056 #ifdef CONFIG_X86_32
1057
1058 static struct resource video_ram_resource = {
1059         .name   = "Video RAM area",
1060         .start  = 0xa0000,
1061         .end    = 0xbffff,
1062         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
1063 };
1064
1065 void __init i386_reserve_resources(void)
1066 {
1067         request_resource(&iomem_resource, &video_ram_resource);
1068         reserve_standard_io_resources();
1069 }
1070
1071 #endif /* CONFIG_X86_32 */