arch/x86/kernel/setup.c

   1 /*
   2  *  Copyright (C) 1995  Linus Torvalds
   3  *
   4  *  Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999
   5  *
   6  *  Memory region support
   7  *      David Parsons <orc@pell.chi.il.us>, July-August 1999
   8  *
   9  *  Added E820 sanitization routine (removes overlapping memory regions);
  10  *  Brian Moyle <bmoyle@mvista.com>, February 2001
  11  *
  12  * Moved CPU detection code to cpu/${cpu}.c
  13  *    Patrick Mochel <mochel@osdl.org>, March 2002
  14  *
  15  *  Provisions for empty E820 memory regions (reported by certain BIOSes).
  16  *  Alex Achenbach <xela@slit.de>, December 2002.
  17  *
  18  */
  19
  20 /*
  21  * This file handles the architecture-dependent parts of initialization
  22  */
  23
  24 #include <linux/sched.h>
  25 #include <linux/mm.h>
  26 #include <linux/mmzone.h>
  27 #include <linux/screen_info.h>
  28 #include <linux/ioport.h>
  29 #include <linux/acpi.h>
  30 #include <linux/apm_bios.h>
  31 #include <linux/initrd.h>
  32 #include <linux/bootmem.h>
  33 #include <linux/seq_file.h>
  34 #include <linux/console.h>
  35 #include <linux/mca.h>
  36 #include <linux/root_dev.h>
  37 #include <linux/highmem.h>
  38 #include <linux/module.h>
  39 #include <linux/efi.h>
  40 #include <linux/init.h>
  41 #include <linux/edd.h>
  42 #include <linux/iscsi_ibft.h>
  43 #include <linux/nodemask.h>
  44 #include <linux/kexec.h>
  45 #include <linux/dmi.h>
  46 #include <linux/pfn.h>
  47 #include <linux/pci.h>
  48 #include <asm/pci-direct.h>
  49 #include <linux/init_ohci1394_dma.h>
  50 #include <linux/kvm_para.h>
  51
  52 #include <linux/errno.h>
  53 #include <linux/kernel.h>
  54 #include <linux/stddef.h>
  55 #include <linux/unistd.h>
  56 #include <linux/ptrace.h>
  57 #include <linux/slab.h>
  58 #include <linux/user.h>
  59 #include <linux/delay.h>
  60
  61 #include <linux/kallsyms.h>
  62 #include <linux/cpufreq.h>
  63 #include <linux/dma-mapping.h>
  64 #include <linux/ctype.h>
  65 #include <linux/uaccess.h>
  66
  67 #include <linux/percpu.h>
  68 #include <linux/crash_dump.h>
  69
  70 #include <video/edid.h>
  71
  72 #include <asm/mtrr.h>
  73 #include <asm/apic.h>
  74 #include <asm/e820.h>
  75 #include <asm/mpspec.h>
  76 #include <asm/setup.h>
  77 #include <asm/arch_hooks.h>
  78 #include <asm/efi.h>
  79 #include <asm/sections.h>
  80 #include <asm/dmi.h>
  81 #include <asm/io_apic.h>
  82 #include <asm/ist.h>
  83 #include <asm/vmi.h>
  84 #include <setup_arch.h>
  85 #include <asm/bios_ebda.h>
  86 #include <asm/cacheflush.h>
  87 #include <asm/processor.h>
  88 #include <asm/bugs.h>
  89
  90 #include <asm/system.h>
  91 #include <asm/vsyscall.h>
  92 #include <asm/smp.h>
  93 #include <asm/desc.h>
  94 #include <asm/dma.h>
  95 #include <asm/iommu.h>
  96 #include <asm/mmu_context.h>
  97 #include <asm/proto.h>
  98
  99 #include <mach_apic.h>
 100 #include <asm/paravirt.h>
 101 #include <asm/hypervisor.h>
 102
 103 #include <asm/percpu.h>
 104 #include <asm/topology.h>
 105 #include <asm/apicdef.h>
 106 #ifdef CONFIG_X86_64
 107 #include <asm/numa_64.h>
 108 #endif
 109
 110 #ifndef ARCH_SETUP
 111 #define ARCH_SETUP
 112 #endif
 113
 114 #ifndef CONFIG_DEBUG_BOOT_PARAMS
 115 struct boot_params __initdata boot_params;
 116 #else
 117 struct boot_params boot_params;
 118 #endif
 119
 120 /*
 121  * Machine setup..
 122  */
 123 static struct resource data_resource = {
 124         .name   = "Kernel data",
 125         .start  = 0,
 126         .end    = 0,
 127         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 128 };
 129
 130 static struct resource code_resource = {
 131         .name   = "Kernel code",
 132         .start  = 0,
 133         .end    = 0,
 134         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 135 };
 136
 137 static struct resource bss_resource = {
 138         .name   = "Kernel bss",
 139         .start  = 0,
 140         .end    = 0,
 141         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 142 };
 143
 144
 145 #ifdef CONFIG_X86_32
 146 /* This value is set up by the early boot code to point to the value
 147    immediately after the boot time page tables.  It contains a *physical*
 148    address, and must not be in the .bss segment! */
 149 unsigned long init_pg_tables_start __initdata = ~0UL;
 150 unsigned long init_pg_tables_end __initdata = ~0UL;
 151
 152 static struct resource video_ram_resource = {
 153         .name   = "Video RAM area",
 154         .start  = 0xa0000,
 155         .end    = 0xbffff,
 156         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 157 };
 158
 159 /* cpu data as detected by the assembly code in head.S */
 160 struct cpuinfo_x86 new_cpu_data __cpuinitdata = {0, 0, 0, 0, -1, 1, 0, 0, -1};
 161 /* common cpu data for all cpus */
 162 struct cpuinfo_x86 boot_cpu_data __read_mostly = {0, 0, 0, 0, -1, 1, 0, 0, -1};
 163 EXPORT_SYMBOL(boot_cpu_data);
 164 static void set_mca_bus(int x)
 165 {
 166 #ifdef CONFIG_MCA
 167         MCA_bus = x;
 168 #endif
 169 }
 170
 171 unsigned int def_to_bigsmp;
 172
 173 /* for MCA, but anyone else can use it if they want */
 174 unsigned int machine_id;
 175 unsigned int machine_submodel_id;
 176 unsigned int BIOS_revision;
 177
 178 struct apm_info apm_info;
 179 EXPORT_SYMBOL(apm_info);
 180
 181 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
 182         defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
 183 struct ist_info ist_info;
 184 EXPORT_SYMBOL(ist_info);
 185 #else
 186 struct ist_info ist_info;
 187 #endif
 188
 189 #else
 190 struct cpuinfo_x86 boot_cpu_data __read_mostly;
 191 EXPORT_SYMBOL(boot_cpu_data);
 192 #endif
 193
 194
 195 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
 196 unsigned long mmu_cr4_features;
 197 #else
 198 unsigned long mmu_cr4_features = X86_CR4_PAE;
 199 #endif
 200
 201 /* Boot loader ID as an integer, for the benefit of proc_dointvec */
 202 int bootloader_type;
 203
 204 /*
 205  * Early DMI memory
 206  */
 207 int dmi_alloc_index;
 208 char dmi_alloc_data[DMI_MAX_DATA];
 209
 210 /*
 211  * Setup options
 212  */
 213 struct screen_info screen_info;
 214 EXPORT_SYMBOL(screen_info);
 215 struct edid_info edid_info;
 216 EXPORT_SYMBOL_GPL(edid_info);
 217
 218 extern int root_mountflags;
 219
 220 unsigned long saved_video_mode;
 221
 222 #define RAMDISK_IMAGE_START_MASK        0x07FF
 223 #define RAMDISK_PROMPT_FLAG             0x8000
 224 #define RAMDISK_LOAD_FLAG               0x4000
 225
 226 static char __initdata command_line[COMMAND_LINE_SIZE];
 227 #ifdef CONFIG_CMDLINE_BOOL
 228 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
 229 #endif
 230
 231 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
 232 struct edd edd;
 233 #ifdef CONFIG_EDD_MODULE
 234 EXPORT_SYMBOL(edd);
 235 #endif
 236 /**
 237  * copy_edd() - Copy the BIOS EDD information
 238  *              from boot_params into a safe place.
 239  *
 240  */
 241 static inline void copy_edd(void)
 242 {
 243      memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
 244             sizeof(edd.mbr_signature));
 245      memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
 246      edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
 247      edd.edd_info_nr = boot_params.eddbuf_entries;
 248 }
 249 #else
 250 static inline void copy_edd(void)
 251 {
 252 }
 253 #endif
 254
 255 #ifdef CONFIG_BLK_DEV_INITRD
 256
 257 #ifdef CONFIG_X86_32
 258
 259 #define MAX_MAP_CHUNK   (NR_FIX_BTMAPS << PAGE_SHIFT)
 260 static void __init relocate_initrd(void)
 261 {
 262
 263         u64 ramdisk_image = boot_params.hdr.ramdisk_image;
 264         u64 ramdisk_size  = boot_params.hdr.ramdisk_size;
 265         u64 end_of_lowmem = max_low_pfn << PAGE_SHIFT;
 266         u64 ramdisk_here;
 267         unsigned long slop, clen, mapaddr;
 268         char *p, *q;
 269
 270         /* We need to move the initrd down into lowmem */
 271         ramdisk_here = find_e820_area(0, end_of_lowmem, ramdisk_size,
 272                                          PAGE_SIZE);
 273
 274         if (ramdisk_here == -1ULL)
 275                 panic("Cannot find place for new RAMDISK of size %lld\n",
 276                          ramdisk_size);
 277
 278         /* Note: this includes all the lowmem currently occupied by
 279            the initrd, we rely on that fact to keep the data intact. */
 280         reserve_early(ramdisk_here, ramdisk_here + ramdisk_size,
 281                          "NEW RAMDISK");
 282         initrd_start = ramdisk_here + PAGE_OFFSET;
 283         initrd_end   = initrd_start + ramdisk_size;
 284         printk(KERN_INFO "Allocated new RAMDISK: %08llx - %08llx\n",
 285                          ramdisk_here, ramdisk_here + ramdisk_size);
 286
 287         q = (char *)initrd_start;
 288
 289         /* Copy any lowmem portion of the initrd */
 290         if (ramdisk_image < end_of_lowmem) {
 291                 clen = end_of_lowmem - ramdisk_image;
 292                 p = (char *)__va(ramdisk_image);
 293                 memcpy(q, p, clen);
 294                 q += clen;
 295                 ramdisk_image += clen;
 296                 ramdisk_size  -= clen;
 297         }
 298
 299         /* Copy the highmem portion of the initrd */
 300         while (ramdisk_size) {
 301                 slop = ramdisk_image & ~PAGE_MASK;
 302                 clen = ramdisk_size;
 303                 if (clen > MAX_MAP_CHUNK-slop)
 304                         clen = MAX_MAP_CHUNK-slop;
 305                 mapaddr = ramdisk_image & PAGE_MASK;
 306                 p = early_memremap(mapaddr, clen+slop);
 307                 memcpy(q, p+slop, clen);
 308                 early_iounmap(p, clen+slop);
 309                 q += clen;
 310                 ramdisk_image += clen;
 311                 ramdisk_size  -= clen;
 312         }
 313         /* high pages is not converted by early_res_to_bootmem */
 314         ramdisk_image = boot_params.hdr.ramdisk_image;
 315         ramdisk_size  = boot_params.hdr.ramdisk_size;
 316         printk(KERN_INFO "Move RAMDISK from %016llx - %016llx to"
 317                 " %08llx - %08llx\n",
 318                 ramdisk_image, ramdisk_image + ramdisk_size - 1,
 319                 ramdisk_here, ramdisk_here + ramdisk_size - 1);
 320 }
 321 #endif
 322
 323 static void __init reserve_initrd(void)
 324 {
 325         u64 ramdisk_image = boot_params.hdr.ramdisk_image;
 326         u64 ramdisk_size  = boot_params.hdr.ramdisk_size;
 327         u64 ramdisk_end   = ramdisk_image + ramdisk_size;
 328         u64 end_of_lowmem = max_low_pfn << PAGE_SHIFT;
 329
 330         if (!boot_params.hdr.type_of_loader ||
 331             !ramdisk_image || !ramdisk_size)
 332                 return;         /* No initrd provided by bootloader */
 333
 334         initrd_start = 0;
 335
 336         if (ramdisk_size >= (end_of_lowmem>>1)) {
 337                 free_early(ramdisk_image, ramdisk_end);
 338                 printk(KERN_ERR "initrd too large to handle, "
 339                        "disabling initrd\n");
 340                 return;
 341         }
 342
 343         printk(KERN_INFO "RAMDISK: %08llx - %08llx\n", ramdisk_image,
 344                         ramdisk_end);
 345
 346
 347         if (ramdisk_end <= end_of_lowmem) {
 348                 /* All in lowmem, easy case */
 349                 /*
 350                  * don't need to reserve again, already reserved early
 351                  * in i386_start_kernel
 352                  */
 353                 initrd_start = ramdisk_image + PAGE_OFFSET;
 354                 initrd_end = initrd_start + ramdisk_size;
 355                 return;
 356         }
 357
 358 #ifdef CONFIG_X86_32
 359         relocate_initrd();
 360 #else
 361         printk(KERN_ERR "initrd extends beyond end of memory "
 362                "(0x%08llx > 0x%08llx)\ndisabling initrd\n",
 363                ramdisk_end, end_of_lowmem);
 364         initrd_start = 0;
 365 #endif
 366         free_early(ramdisk_image, ramdisk_end);
 367 }
 368 #else
 369 static void __init reserve_initrd(void)
 370 {
 371 }
 372 #endif /* CONFIG_BLK_DEV_INITRD */
 373
 374 static void __init parse_setup_data(void)
 375 {
 376         struct setup_data *data;
 377         u64 pa_data;
 378
 379         if (boot_params.hdr.version < 0x0209)
 380                 return;
 381         pa_data = boot_params.hdr.setup_data;
 382         while (pa_data) {
 383                 data = early_memremap(pa_data, PAGE_SIZE);
 384                 switch (data->type) {
 385                 case SETUP_E820_EXT:
 386                         parse_e820_ext(data, pa_data);
 387                         break;
 388                 default:
 389                         break;
 390                 }
 391                 pa_data = data->next;
 392                 early_iounmap(data, PAGE_SIZE);
 393         }
 394 }
 395
 396 static void __init e820_reserve_setup_data(void)
 397 {
 398         struct setup_data *data;
 399         u64 pa_data;
 400         int found = 0;
 401
 402         if (boot_params.hdr.version < 0x0209)
 403                 return;
 404         pa_data = boot_params.hdr.setup_data;
 405         while (pa_data) {
 406                 data = early_memremap(pa_data, sizeof(*data));
 407                 e820_update_range(pa_data, sizeof(*data)+data->len,
 408                          E820_RAM, E820_RESERVED_KERN);
 409                 found = 1;
 410                 pa_data = data->next;
 411                 early_iounmap(data, sizeof(*data));
 412         }
 413         if (!found)
 414                 return;
 415
 416         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 417         memcpy(&e820_saved, &e820, sizeof(struct e820map));
 418         printk(KERN_INFO "extended physical RAM map:\n");
 419         e820_print_map("reserve setup_data");
 420 }
 421
 422 static void __init reserve_early_setup_data(void)
 423 {
 424         struct setup_data *data;
 425         u64 pa_data;
 426         char buf[32];
 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, sizeof(*data));
 433                 sprintf(buf, "setup data %x", data->type);
 434                 reserve_early(pa_data, pa_data+sizeof(*data)+data->len, buf);
 435                 pa_data = data->next;
 436                 early_iounmap(data, sizeof(*data));
 437         }
 438 }
 439
 440 /*
 441  * --------- Crashkernel reservation ------------------------------
 442  */
 443
 444 #ifdef CONFIG_KEXEC
 445
 446 /**
 447  * Reserve @size bytes of crashkernel memory at any suitable offset.
 448  *
 449  * @size: Size of the crashkernel memory to reserve.
 450  * Returns the base address on success, and -1ULL on failure.
 451  */
 452 unsigned long long __init find_and_reserve_crashkernel(unsigned long long size)
 453 {
 454         const unsigned long long alignment = 16<<20;    /* 16M */
 455         unsigned long long start = 0LL;
 456
 457         while (1) {
 458                 int ret;
 459
 460                 start = find_e820_area(start, ULONG_MAX, size, alignment);
 461                 if (start == -1ULL)
 462                         return start;
 463
 464                 /* try to reserve it */
 465                 ret = reserve_bootmem_generic(start, size, BOOTMEM_EXCLUSIVE);
 466                 if (ret >= 0)
 467                         return start;
 468
 469                 start += alignment;
 470         }
 471 }
 472
 473 static inline unsigned long long get_total_mem(void)
 474 {
 475         unsigned long long total;
 476
 477         total = max_low_pfn - min_low_pfn;
 478 #ifdef CONFIG_HIGHMEM
 479         total += highend_pfn - highstart_pfn;
 480 #endif
 481
 482         return total << PAGE_SHIFT;
 483 }
 484
 485 static void __init reserve_crashkernel(void)
 486 {
 487         unsigned long long total_mem;
 488         unsigned long long crash_size, crash_base;
 489         int ret;
 490
 491         total_mem = get_total_mem();
 492
 493         ret = parse_crashkernel(boot_command_line, total_mem,
 494                         &crash_size, &crash_base);
 495         if (ret != 0 || crash_size <= 0)
 496                 return;
 497
 498         /* 0 means: find the address automatically */
 499         if (crash_base <= 0) {
 500                 crash_base = find_and_reserve_crashkernel(crash_size);
 501                 if (crash_base == -1ULL) {
 502                         pr_info("crashkernel reservation failed. "
 503                                 "No suitable area found.\n");
 504                         return;
 505                 }
 506         } else {
 507                 ret = reserve_bootmem_generic(crash_base, crash_size,
 508                                         BOOTMEM_EXCLUSIVE);
 509                 if (ret < 0) {
 510                         pr_info("crashkernel reservation failed - "
 511                                 "memory is in use\n");
 512                         return;
 513                 }
 514         }
 515
 516         printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
 517                         "for crashkernel (System RAM: %ldMB)\n",
 518                         (unsigned long)(crash_size >> 20),
 519                         (unsigned long)(crash_base >> 20),
 520                         (unsigned long)(total_mem >> 20));
 521
 522         crashk_res.start = crash_base;
 523         crashk_res.end   = crash_base + crash_size - 1;
 524         insert_resource(&iomem_resource, &crashk_res);
 525 }
 526 #else
 527 static void __init reserve_crashkernel(void)
 528 {
 529 }
 530 #endif
 531
 532 static struct resource standard_io_resources[] = {
 533         { .name = "dma1", .start = 0x00, .end = 0x1f,
 534                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 535         { .name = "pic1", .start = 0x20, .end = 0x21,
 536                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 537         { .name = "timer0", .start = 0x40, .end = 0x43,
 538                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 539         { .name = "timer1", .start = 0x50, .end = 0x53,
 540                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 541         { .name = "keyboard", .start = 0x60, .end = 0x60,
 542                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 543         { .name = "keyboard", .start = 0x64, .end = 0x64,
 544                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 545         { .name = "dma page reg", .start = 0x80, .end = 0x8f,
 546                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 547         { .name = "pic2", .start = 0xa0, .end = 0xa1,
 548                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 549         { .name = "dma2", .start = 0xc0, .end = 0xdf,
 550                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 551         { .name = "fpu", .start = 0xf0, .end = 0xff,
 552                 .flags = IORESOURCE_BUSY | IORESOURCE_IO }
 553 };
 554
 555 static void __init reserve_standard_io_resources(void)
 556 {
 557         int i;
 558
 559         /* request I/O space for devices used on all i[345]86 PCs */
 560         for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
 561                 request_resource(&ioport_resource, &standard_io_resources[i]);
 562
 563 }
 564
 565 /*
 566  * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
 567  * is_kdump_kernel() to determine if we are booting after a panic. Hence
 568  * ifdef it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
 569  */
 570
 571 #ifdef CONFIG_CRASH_DUMP
 572 /* elfcorehdr= specifies the location of elf core header
 573  * stored by the crashed kernel. This option will be passed
 574  * by kexec loader to the capture kernel.
 575  */
 576 static int __init setup_elfcorehdr(char *arg)
 577 {
 578         char *end;
 579         if (!arg)
 580                 return -EINVAL;
 581         elfcorehdr_addr = memparse(arg, &end);
 582         return end > arg ? 0 : -EINVAL;
 583 }
 584 early_param("elfcorehdr", setup_elfcorehdr);
 585 #endif
 586
 587 static struct x86_quirks default_x86_quirks __initdata;
 588
 589 struct x86_quirks *x86_quirks __initdata = &default_x86_quirks;
 590
 591 /*
 592  * Some BIOSes seem to corrupt the low 64k of memory during events
 593  * like suspend/resume and unplugging an HDMI cable.  Reserve all
 594  * remaining free memory in that area and fill it with a distinct
 595  * pattern.
 596  */
 597 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
 598 #define MAX_SCAN_AREAS  8
 599
 600 static int __read_mostly memory_corruption_check = -1;
 601
 602 static unsigned __read_mostly corruption_check_size = 64*1024;
 603 static unsigned __read_mostly corruption_check_period = 60; /* seconds */
 604
 605 static struct e820entry scan_areas[MAX_SCAN_AREAS];
 606 static int num_scan_areas;
 607
 608
 609 static int set_corruption_check(char *arg)
 610 {
 611         char *end;
 612
 613         memory_corruption_check = simple_strtol(arg, &end, 10);
 614
 615         return (*end == 0) ? 0 : -EINVAL;
 616 }
 617 early_param("memory_corruption_check", set_corruption_check);
 618
 619 static int set_corruption_check_period(char *arg)
 620 {
 621         char *end;
 622
 623         corruption_check_period = simple_strtoul(arg, &end, 10);
 624
 625         return (*end == 0) ? 0 : -EINVAL;
 626 }
 627 early_param("memory_corruption_check_period", set_corruption_check_period);
 628
 629 static int set_corruption_check_size(char *arg)
 630 {
 631         char *end;
 632         unsigned size;
 633
 634         size = memparse(arg, &end);
 635
 636         if (*end == '\0')
 637                 corruption_check_size = size;
 638
 639         return (size == corruption_check_size) ? 0 : -EINVAL;
 640 }
 641 early_param("memory_corruption_check_size", set_corruption_check_size);
 642
 643
 644 static void __init setup_bios_corruption_check(void)
 645 {
 646         u64 addr = PAGE_SIZE;   /* assume first page is reserved anyway */
 647
 648         if (memory_corruption_check == -1) {
 649                 memory_corruption_check =
 650 #ifdef CONFIG_X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK
 651                         1
 652 #else
 653                         0
 654 #endif
 655                         ;
 656         }
 657
 658         if (corruption_check_size == 0)
 659                 memory_corruption_check = 0;
 660
 661         if (!memory_corruption_check)
 662                 return;
 663
 664         corruption_check_size = round_up(corruption_check_size, PAGE_SIZE);
 665
 666         while(addr < corruption_check_size && num_scan_areas < MAX_SCAN_AREAS) {
 667                 u64 size;
 668                 addr = find_e820_area_size(addr, &size, PAGE_SIZE);
 669
 670                 if (addr == 0)
 671                         break;
 672
 673                 if ((addr + size) > corruption_check_size)
 674                         size = corruption_check_size - addr;
 675
 676                 if (size == 0)
 677                         break;
 678
 679                 e820_update_range(addr, size, E820_RAM, E820_RESERVED);
 680                 scan_areas[num_scan_areas].addr = addr;
 681                 scan_areas[num_scan_areas].size = size;
 682                 num_scan_areas++;
 683
 684                 /* Assume we've already mapped this early memory */
 685                 memset(__va(addr), 0, size);
 686
 687                 addr += size;
 688         }
 689
 690         printk(KERN_INFO "Scanning %d areas for low memory corruption\n",
 691                num_scan_areas);
 692         update_e820();
 693 }
 694
 695 static struct timer_list periodic_check_timer;
 696
 697 void check_for_bios_corruption(void)
 698 {
 699         int i;
 700         int corruption = 0;
 701
 702         if (!memory_corruption_check)
 703                 return;
 704
 705         for(i = 0; i < num_scan_areas; i++) {
 706                 unsigned long *addr = __va(scan_areas[i].addr);
 707                 unsigned long size = scan_areas[i].size;
 708
 709                 for(; size; addr++, size -= sizeof(unsigned long)) {
 710                         if (!*addr)
 711                                 continue;
 712                         printk(KERN_ERR "Corrupted low memory at %p (%lx phys) = %08lx\n",
 713                                addr, __pa(addr), *addr);
 714                         corruption = 1;
 715                         *addr = 0;
 716                 }
 717         }
 718
 719         WARN(corruption, KERN_ERR "Memory corruption detected in low memory\n");
 720 }
 721
 722 static void periodic_check_for_corruption(unsigned long data)
 723 {
 724         check_for_bios_corruption();
 725         mod_timer(&periodic_check_timer, round_jiffies(jiffies + corruption_check_period*HZ));
 726 }
 727
 728 void start_periodic_check_for_corruption(void)
 729 {
 730         if (!memory_corruption_check || corruption_check_period == 0)
 731                 return;
 732
 733         printk(KERN_INFO "Scanning for low memory corruption every %d seconds\n",
 734                corruption_check_period);
 735
 736         init_timer(&periodic_check_timer);
 737         periodic_check_timer.function = &periodic_check_for_corruption;
 738         periodic_check_for_corruption(0);
 739 }
 740 #endif
 741
 742 static int __init dmi_low_memory_corruption(const struct dmi_system_id *d)
 743 {
 744         printk(KERN_NOTICE
 745                 "%s detected: BIOS may corrupt low RAM, working it around.\n",
 746                 d->ident);
 747
 748         e820_update_range(0, 0x10000, E820_RAM, E820_RESERVED);
 749         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 750
 751         return 0;
 752 }
 753
 754 /* List of systems that have known low memory corruption BIOS problems */
 755 static struct dmi_system_id __initdata bad_bios_dmi_table[] = {
 756 #ifdef CONFIG_X86_RESERVE_LOW_64K
 757         {
 758                 .callback = dmi_low_memory_corruption,
 759                 .ident = "AMI BIOS",
 760                 .matches = {
 761                         DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
 762                 },
 763         },
 764         {
 765                 .callback = dmi_low_memory_corruption,
 766                 .ident = "Phoenix BIOS",
 767                 .matches = {
 768                         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies, LTD"),
 769                 },
 770         },
 771 #endif
 772         {}
 773 };
 774
 775 /*
 776  * Determine if we were loaded by an EFI loader.  If so, then we have also been
 777  * passed the efi memmap, systab, etc., so we should use these data structures
 778  * for initialization.  Note, the efi init code path is determined by the
 779  * global efi_enabled. This allows the same kernel image to be used on existing
 780  * systems (with a traditional BIOS) as well as on EFI systems.
 781  */
 782 /*
 783  * setup_arch - architecture-specific boot-time initializations
 784  *
 785  * Note: On x86_64, fixmaps are ready for use even before this is called.
 786  */
 787
 788 void __init setup_arch(char **cmdline_p)
 789 {
 790 #ifdef CONFIG_X86_32
 791         memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
 792         visws_early_detect();
 793         pre_setup_arch_hook();
 794 #else
 795         printk(KERN_INFO "Command line: %s\n", boot_command_line);
 796 #endif
 797
 798         early_cpu_init();
 799         early_ioremap_init();
 800
 801         ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
 802         screen_info = boot_params.screen_info;
 803         edid_info = boot_params.edid_info;
 804 #ifdef CONFIG_X86_32
 805         apm_info.bios = boot_params.apm_bios_info;
 806         ist_info = boot_params.ist_info;
 807         if (boot_params.sys_desc_table.length != 0) {
 808                 set_mca_bus(boot_params.sys_desc_table.table[3] & 0x2);
 809                 machine_id = boot_params.sys_desc_table.table[0];
 810                 machine_submodel_id = boot_params.sys_desc_table.table[1];
 811                 BIOS_revision = boot_params.sys_desc_table.table[2];
 812         }
 813 #endif
 814         saved_video_mode = boot_params.hdr.vid_mode;
 815         bootloader_type = boot_params.hdr.type_of_loader;
 816
 817 #ifdef CONFIG_BLK_DEV_RAM
 818         rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
 819         rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
 820         rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
 821 #endif
 822 #ifdef CONFIG_EFI
 823         if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
 824 #ifdef CONFIG_X86_32
 825                      "EL32",
 826 #else
 827                      "EL64",
 828 #endif
 829          4)) {
 830                 efi_enabled = 1;
 831                 efi_reserve_early();
 832         }
 833 #endif
 834
 835         ARCH_SETUP
 836
 837         setup_memory_map();
 838         parse_setup_data();
 839         /* update the e820_saved too */
 840         e820_reserve_setup_data();
 841
 842         copy_edd();
 843
 844         if (!boot_params.hdr.root_flags)
 845                 root_mountflags &= ~MS_RDONLY;
 846         init_mm.start_code = (unsigned long) _text;
 847         init_mm.end_code = (unsigned long) _etext;
 848         init_mm.end_data = (unsigned long) _edata;
 849 #ifdef CONFIG_X86_32
 850         init_mm.brk = init_pg_tables_end + PAGE_OFFSET;
 851 #else
 852         init_mm.brk = (unsigned long) &_end;
 853 #endif
 854
 855         code_resource.start = virt_to_phys(_text);
 856         code_resource.end = virt_to_phys(_etext)-1;
 857         data_resource.start = virt_to_phys(_etext);
 858         data_resource.end = virt_to_phys(_edata)-1;
 859         bss_resource.start = virt_to_phys(&__bss_start);
 860         bss_resource.end = virt_to_phys(&__bss_stop)-1;
 861
 862 #ifdef CONFIG_CMDLINE_BOOL
 863 #ifdef CONFIG_CMDLINE_OVERRIDE
 864         strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 865 #else
 866         if (builtin_cmdline[0]) {
 867                 /* append boot loader cmdline to builtin */
 868                 strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE);
 869                 strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE);
 870                 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 871         }
 872 #endif
 873 #endif
 874
 875         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 876         *cmdline_p = command_line;
 877
 878         parse_early_param();
 879
 880 #ifdef CONFIG_X86_64
 881         check_efer();
 882 #endif
 883
 884 #if defined(CONFIG_VMI) && defined(CONFIG_X86_32)
 885         /*
 886          * Must be before kernel pagetables are setup
 887          * or fixmap area is touched.
 888          */
 889         vmi_init();
 890 #endif
 891
 892         /* after early param, so could get panic from serial */
 893         reserve_early_setup_data();
 894
 895         if (acpi_mps_check()) {
 896 #ifdef CONFIG_X86_LOCAL_APIC
 897                 disable_apic = 1;
 898 #endif
 899                 setup_clear_cpu_cap(X86_FEATURE_APIC);
 900         }
 901
 902 #ifdef CONFIG_PCI
 903         if (pci_early_dump_regs)
 904                 early_dump_pci_devices();
 905 #endif
 906
 907         finish_e820_parsing();
 908
 909         dmi_scan_machine();
 910
 911         dmi_check_system(bad_bios_dmi_table);
 912
 913         /*
 914          * VMware detection requires dmi to be available, so this
 915          * needs to be done after dmi_scan_machine, for the BP.
 916          */
 917         init_hypervisor(&boot_cpu_data);
 918
 919 #ifdef CONFIG_X86_32
 920         probe_roms();
 921 #endif
 922
 923         /* after parse_early_param, so could debug it */
 924         insert_resource(&iomem_resource, &code_resource);
 925         insert_resource(&iomem_resource, &data_resource);
 926         insert_resource(&iomem_resource, &bss_resource);
 927
 928         if (efi_enabled)
 929                 efi_init();
 930
 931 #ifdef CONFIG_X86_32
 932         if (ppro_with_ram_bug()) {
 933                 e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM,
 934                                   E820_RESERVED);
 935                 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 936                 printk(KERN_INFO "fixed physical RAM map:\n");
 937                 e820_print_map("bad_ppro");
 938         }
 939 #else
 940         early_gart_iommu_check();
 941 #endif
 942
 943         /*
 944          * partially used pages are not usable - thus
 945          * we are rounding upwards:
 946          */
 947         max_pfn = e820_end_of_ram_pfn();
 948
 949         /* preallocate 4k for mptable mpc */
 950         early_reserve_e820_mpc_new();
 951         /* update e820 for memory not covered by WB MTRRs */
 952         mtrr_bp_init();
 953         if (mtrr_trim_uncached_memory(max_pfn))
 954                 max_pfn = e820_end_of_ram_pfn();
 955
 956 #ifdef CONFIG_X86_32
 957         /* max_low_pfn get updated here */
 958         find_low_pfn_range();
 959 #else
 960         num_physpages = max_pfn;
 961
 962         if (cpu_has_x2apic)
 963                 check_x2apic();
 964
 965         /* How many end-of-memory variables you have, grandma! */
 966         /* need this before calling reserve_initrd */
 967         if (max_pfn > (1UL<<(32 - PAGE_SHIFT)))
 968                 max_low_pfn = e820_end_of_low_ram_pfn();
 969         else
 970                 max_low_pfn = max_pfn;
 971
 972         high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
 973 #endif
 974
 975 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
 976         setup_bios_corruption_check();
 977 #endif
 978
 979         /* max_pfn_mapped is updated here */
 980         max_low_pfn_mapped = init_memory_mapping(0, max_low_pfn<<PAGE_SHIFT);
 981         max_pfn_mapped = max_low_pfn_mapped;
 982
 983 #ifdef CONFIG_X86_64
 984         if (max_pfn > max_low_pfn) {
 985                 max_pfn_mapped = init_memory_mapping(1UL<<32,
 986                                                      max_pfn<<PAGE_SHIFT);
 987                 /* can we preseve max_low_pfn ?*/
 988                 max_low_pfn = max_pfn;
 989         }
 990 #endif
 991
 992         /*
 993          * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
 994          */
 995
 996 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
 997         if (init_ohci1394_dma_early)
 998                 init_ohci1394_dma_on_all_controllers();
 999 #endif
1000
1001         reserve_initrd();
1002
1003 #ifdef CONFIG_X86_64
1004         vsmp_init();
1005 #endif
1006
1007         io_delay_init();
1008
1009         /*
1010          * Parse the ACPI tables for possible boot-time SMP configuration.
1011          */
1012         acpi_boot_table_init();
1013
1014         early_acpi_boot_init();
1015
1016 #ifdef CONFIG_ACPI_NUMA
1017         /*
1018          * Parse SRAT to discover nodes.
1019          */
1020         acpi_numa_init();
1021 #endif
1022
1023         initmem_init(0, max_pfn);
1024
1025 #ifdef CONFIG_ACPI_SLEEP
1026         /*
1027          * Reserve low memory region for sleep support.
1028          */
1029         acpi_reserve_bootmem();
1030 #endif
1031 #ifdef CONFIG_X86_FIND_SMP_CONFIG
1032         /*
1033          * Find and reserve possible boot-time SMP configuration:
1034          */
1035         find_smp_config();
1036 #endif
1037         reserve_crashkernel();
1038
1039 #ifdef CONFIG_X86_64
1040         /*
1041          * dma32_reserve_bootmem() allocates bootmem which may conflict
1042          * with the crashkernel command line, so do that after
1043          * reserve_crashkernel()
1044          */
1045         dma32_reserve_bootmem();
1046 #endif
1047
1048         reserve_ibft_region();
1049
1050 #ifdef CONFIG_KVM_CLOCK
1051         kvmclock_init();
1052 #endif
1053
1054         paravirt_pagetable_setup_start(swapper_pg_dir);
1055         paging_init();
1056         paravirt_pagetable_setup_done(swapper_pg_dir);
1057         paravirt_post_allocator_init();
1058
1059 #ifdef CONFIG_X86_64
1060         map_vsyscall();
1061 #endif
1062
1063 #ifdef CONFIG_X86_GENERICARCH
1064         generic_apic_probe();
1065 #endif
1066
1067         early_quirks();
1068
1069         /*
1070          * Read APIC and some other early information from ACPI tables.
1071          */
1072         acpi_boot_init();
1073
1074 #if defined(CONFIG_X86_MPPARSE) || defined(CONFIG_X86_VISWS)
1075         /*
1076          * get boot-time SMP configuration:
1077          */
1078         if (smp_found_config)
1079                 get_smp_config();
1080 #endif
1081
1082         prefill_possible_map();
1083
1084 #ifdef CONFIG_X86_64
1085         init_cpu_to_node();
1086 #endif
1087
1088         init_apic_mappings();
1089         ioapic_init_mappings();
1090
1091         /* need to wait for io_apic is mapped */
1092         nr_irqs = probe_nr_irqs();
1093
1094         kvm_guest_init();
1095
1096         e820_reserve_resources();
1097         e820_mark_nosave_regions(max_low_pfn);
1098
1099 #ifdef CONFIG_X86_32
1100         request_resource(&iomem_resource, &video_ram_resource);
1101 #endif
1102         reserve_standard_io_resources();
1103
1104         e820_setup_gap();
1105
1106 #ifdef CONFIG_VT
1107 #if defined(CONFIG_VGA_CONSOLE)
1108         if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
1109                 conswitchp = &vga_con;
1110 #elif defined(CONFIG_DUMMY_CONSOLE)
1111         conswitchp = &dummy_con;
1112 #endif
1113 #endif
1114 }
1115
1116