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
 102 #include <asm/percpu.h>
 103 #include <asm/topology.h>
 104 #include <asm/apicdef.h>
 105 #ifdef CONFIG_X86_64
 106 #include <asm/numa_64.h>
 107 #endif
 108
 109 #ifndef ARCH_SETUP
 110 #define ARCH_SETUP
 111 #endif
 112
 113 #ifndef CONFIG_DEBUG_BOOT_PARAMS
 114 struct boot_params __initdata boot_params;
 115 #else
 116 struct boot_params boot_params;
 117 #endif
 118
 119 /*
 120  * Machine setup..
 121  */
 122 static struct resource data_resource = {
 123         .name   = "Kernel data",
 124         .start  = 0,
 125         .end    = 0,
 126         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 127 };
 128
 129 static struct resource code_resource = {
 130         .name   = "Kernel code",
 131         .start  = 0,
 132         .end    = 0,
 133         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 134 };
 135
 136 static struct resource bss_resource = {
 137         .name   = "Kernel bss",
 138         .start  = 0,
 139         .end    = 0,
 140         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 141 };
 142
 143
 144 #ifdef CONFIG_X86_32
 145 /* This value is set up by the early boot code to point to the value
 146    immediately after the boot time page tables.  It contains a *physical*
 147    address, and must not be in the .bss segment! */
 148 unsigned long init_pg_tables_start __initdata = ~0UL;
 149 unsigned long init_pg_tables_end __initdata = ~0UL;
 150
 151 static struct resource video_ram_resource = {
 152         .name   = "Video RAM area",
 153         .start  = 0xa0000,
 154         .end    = 0xbffff,
 155         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 156 };
 157
 158 /* cpu data as detected by the assembly code in head.S */
 159 struct cpuinfo_x86 new_cpu_data __cpuinitdata = {0, 0, 0, 0, -1, 1, 0, 0, -1};
 160 /* common cpu data for all cpus */
 161 struct cpuinfo_x86 boot_cpu_data __read_mostly = {0, 0, 0, 0, -1, 1, 0, 0, -1};
 162 EXPORT_SYMBOL(boot_cpu_data);
 163 static void set_mca_bus(int x)
 164 {
 165 #ifdef CONFIG_MCA
 166         MCA_bus = x;
 167 #endif
 168 }
 169
 170 unsigned int def_to_bigsmp;
 171
 172 /* for MCA, but anyone else can use it if they want */
 173 unsigned int machine_id;
 174 unsigned int machine_submodel_id;
 175 unsigned int BIOS_revision;
 176
 177 struct apm_info apm_info;
 178 EXPORT_SYMBOL(apm_info);
 179
 180 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
 181         defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
 182 struct ist_info ist_info;
 183 EXPORT_SYMBOL(ist_info);
 184 #else
 185 struct ist_info ist_info;
 186 #endif
 187
 188 #else
 189 struct cpuinfo_x86 boot_cpu_data __read_mostly;
 190 EXPORT_SYMBOL(boot_cpu_data);
 191 #endif
 192
 193
 194 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
 195 unsigned long mmu_cr4_features;
 196 #else
 197 unsigned long mmu_cr4_features = X86_CR4_PAE;
 198 #endif
 199
 200 /* Boot loader ID as an integer, for the benefit of proc_dointvec */
 201 int bootloader_type;
 202
 203 /*
 204  * Early DMI memory
 205  */
 206 int dmi_alloc_index;
 207 char dmi_alloc_data[DMI_MAX_DATA];
 208
 209 /*
 210  * Setup options
 211  */
 212 struct screen_info screen_info;
 213 EXPORT_SYMBOL(screen_info);
 214 struct edid_info edid_info;
 215 EXPORT_SYMBOL_GPL(edid_info);
 216
 217 extern int root_mountflags;
 218
 219 unsigned long saved_video_mode;
 220
 221 #define RAMDISK_IMAGE_START_MASK        0x07FF
 222 #define RAMDISK_PROMPT_FLAG             0x8000
 223 #define RAMDISK_LOAD_FLAG               0x4000
 224
 225 static char __initdata command_line[COMMAND_LINE_SIZE];
 226
 227 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
 228 struct edd edd;
 229 #ifdef CONFIG_EDD_MODULE
 230 EXPORT_SYMBOL(edd);
 231 #endif
 232 /**
 233  * copy_edd() - Copy the BIOS EDD information
 234  *              from boot_params into a safe place.
 235  *
 236  */
 237 static inline void copy_edd(void)
 238 {
 239      memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
 240             sizeof(edd.mbr_signature));
 241      memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
 242      edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
 243      edd.edd_info_nr = boot_params.eddbuf_entries;
 244 }
 245 #else
 246 static inline void copy_edd(void)
 247 {
 248 }
 249 #endif
 250
 251 #ifdef CONFIG_BLK_DEV_INITRD
 252
 253 #ifdef CONFIG_X86_32
 254
 255 #define MAX_MAP_CHUNK   (NR_FIX_BTMAPS << PAGE_SHIFT)
 256 static void __init relocate_initrd(void)
 257 {
 258
 259         u64 ramdisk_image = boot_params.hdr.ramdisk_image;
 260         u64 ramdisk_size  = boot_params.hdr.ramdisk_size;
 261         u64 end_of_lowmem = max_low_pfn << PAGE_SHIFT;
 262         u64 ramdisk_here;
 263         unsigned long slop, clen, mapaddr;
 264         char *p, *q;
 265
 266         /* We need to move the initrd down into lowmem */
 267         ramdisk_here = find_e820_area(0, end_of_lowmem, ramdisk_size,
 268                                          PAGE_SIZE);
 269
 270         if (ramdisk_here == -1ULL)
 271                 panic("Cannot find place for new RAMDISK of size %lld\n",
 272                          ramdisk_size);
 273
 274         /* Note: this includes all the lowmem currently occupied by
 275            the initrd, we rely on that fact to keep the data intact. */
 276         reserve_early(ramdisk_here, ramdisk_here + ramdisk_size,
 277                          "NEW RAMDISK");
 278         initrd_start = ramdisk_here + PAGE_OFFSET;
 279         initrd_end   = initrd_start + ramdisk_size;
 280         printk(KERN_INFO "Allocated new RAMDISK: %08llx - %08llx\n",
 281                          ramdisk_here, ramdisk_here + ramdisk_size);
 282
 283         q = (char *)initrd_start;
 284
 285         /* Copy any lowmem portion of the initrd */
 286         if (ramdisk_image < end_of_lowmem) {
 287                 clen = end_of_lowmem - ramdisk_image;
 288                 p = (char *)__va(ramdisk_image);
 289                 memcpy(q, p, clen);
 290                 q += clen;
 291                 ramdisk_image += clen;
 292                 ramdisk_size  -= clen;
 293         }
 294
 295         /* Copy the highmem portion of the initrd */
 296         while (ramdisk_size) {
 297                 slop = ramdisk_image & ~PAGE_MASK;
 298                 clen = ramdisk_size;
 299                 if (clen > MAX_MAP_CHUNK-slop)
 300                         clen = MAX_MAP_CHUNK-slop;
 301                 mapaddr = ramdisk_image & PAGE_MASK;
 302                 p = early_ioremap(mapaddr, clen+slop);
 303                 memcpy(q, p+slop, clen);
 304                 early_iounmap(p, clen+slop);
 305                 q += clen;
 306                 ramdisk_image += clen;
 307                 ramdisk_size  -= clen;
 308         }
 309         /* high pages is not converted by early_res_to_bootmem */
 310         ramdisk_image = boot_params.hdr.ramdisk_image;
 311         ramdisk_size  = boot_params.hdr.ramdisk_size;
 312         printk(KERN_INFO "Move RAMDISK from %016llx - %016llx to"
 313                 " %08llx - %08llx\n",
 314                 ramdisk_image, ramdisk_image + ramdisk_size - 1,
 315                 ramdisk_here, ramdisk_here + ramdisk_size - 1);
 316 }
 317 #endif
 318
 319 static void __init reserve_initrd(void)
 320 {
 321         u64 ramdisk_image = boot_params.hdr.ramdisk_image;
 322         u64 ramdisk_size  = boot_params.hdr.ramdisk_size;
 323         u64 ramdisk_end   = ramdisk_image + ramdisk_size;
 324         u64 end_of_lowmem = max_low_pfn << PAGE_SHIFT;
 325
 326         if (!boot_params.hdr.type_of_loader ||
 327             !ramdisk_image || !ramdisk_size)
 328                 return;         /* No initrd provided by bootloader */
 329
 330         initrd_start = 0;
 331
 332         if (ramdisk_size >= (end_of_lowmem>>1)) {
 333                 free_early(ramdisk_image, ramdisk_end);
 334                 printk(KERN_ERR "initrd too large to handle, "
 335                        "disabling initrd\n");
 336                 return;
 337         }
 338
 339         printk(KERN_INFO "RAMDISK: %08llx - %08llx\n", ramdisk_image,
 340                         ramdisk_end);
 341
 342
 343         if (ramdisk_end <= end_of_lowmem) {
 344                 /* All in lowmem, easy case */
 345                 /*
 346                  * don't need to reserve again, already reserved early
 347                  * in i386_start_kernel
 348                  */
 349                 initrd_start = ramdisk_image + PAGE_OFFSET;
 350                 initrd_end = initrd_start + ramdisk_size;
 351                 return;
 352         }
 353
 354 #ifdef CONFIG_X86_32
 355         relocate_initrd();
 356 #else
 357         printk(KERN_ERR "initrd extends beyond end of memory "
 358                "(0x%08llx > 0x%08llx)\ndisabling initrd\n",
 359                ramdisk_end, end_of_lowmem);
 360         initrd_start = 0;
 361 #endif
 362         free_early(ramdisk_image, ramdisk_end);
 363 }
 364 #else
 365 static void __init reserve_initrd(void)
 366 {
 367 }
 368 #endif /* CONFIG_BLK_DEV_INITRD */
 369
 370 static void __init parse_setup_data(void)
 371 {
 372         struct setup_data *data;
 373         u64 pa_data;
 374
 375         if (boot_params.hdr.version < 0x0209)
 376                 return;
 377         pa_data = boot_params.hdr.setup_data;
 378         while (pa_data) {
 379                 data = early_ioremap(pa_data, PAGE_SIZE);
 380                 switch (data->type) {
 381                 case SETUP_E820_EXT:
 382                         parse_e820_ext(data, pa_data);
 383                         break;
 384                 default:
 385                         break;
 386                 }
 387                 pa_data = data->next;
 388                 early_iounmap(data, PAGE_SIZE);
 389         }
 390 }
 391
 392 static void __init e820_reserve_setup_data(void)
 393 {
 394         struct setup_data *data;
 395         u64 pa_data;
 396         int found = 0;
 397
 398         if (boot_params.hdr.version < 0x0209)
 399                 return;
 400         pa_data = boot_params.hdr.setup_data;
 401         while (pa_data) {
 402                 data = early_ioremap(pa_data, sizeof(*data));
 403                 e820_update_range(pa_data, sizeof(*data)+data->len,
 404                          E820_RAM, E820_RESERVED_KERN);
 405                 found = 1;
 406                 pa_data = data->next;
 407                 early_iounmap(data, sizeof(*data));
 408         }
 409         if (!found)
 410                 return;
 411
 412         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 413         memcpy(&e820_saved, &e820, sizeof(struct e820map));
 414         printk(KERN_INFO "extended physical RAM map:\n");
 415         e820_print_map("reserve setup_data");
 416 }
 417
 418 static void __init reserve_early_setup_data(void)
 419 {
 420         struct setup_data *data;
 421         u64 pa_data;
 422         char buf[32];
 423
 424         if (boot_params.hdr.version < 0x0209)
 425                 return;
 426         pa_data = boot_params.hdr.setup_data;
 427         while (pa_data) {
 428                 data = early_ioremap(pa_data, sizeof(*data));
 429                 sprintf(buf, "setup data %x", data->type);
 430                 reserve_early(pa_data, pa_data+sizeof(*data)+data->len, buf);
 431                 pa_data = data->next;
 432                 early_iounmap(data, sizeof(*data));
 433         }
 434 }
 435
 436 /*
 437  * --------- Crashkernel reservation ------------------------------
 438  */
 439
 440 #ifdef CONFIG_KEXEC
 441
 442 /**
 443  * Reserve @size bytes of crashkernel memory at any suitable offset.
 444  *
 445  * @size: Size of the crashkernel memory to reserve.
 446  * Returns the base address on success, and -1ULL on failure.
 447  */
 448 unsigned long long __init find_and_reserve_crashkernel(unsigned long long size)
 449 {
 450         const unsigned long long alignment = 16<<20;    /* 16M */
 451         unsigned long long start = 0LL;
 452
 453         while (1) {
 454                 int ret;
 455
 456                 start = find_e820_area(start, ULONG_MAX, size, alignment);
 457                 if (start == -1ULL)
 458                         return start;
 459
 460                 /* try to reserve it */
 461                 ret = reserve_bootmem_generic(start, size, BOOTMEM_EXCLUSIVE);
 462                 if (ret >= 0)
 463                         return start;
 464
 465                 start += alignment;
 466         }
 467 }
 468
 469 static inline unsigned long long get_total_mem(void)
 470 {
 471         unsigned long long total;
 472
 473         total = max_low_pfn - min_low_pfn;
 474 #ifdef CONFIG_HIGHMEM
 475         total += highend_pfn - highstart_pfn;
 476 #endif
 477
 478         return total << PAGE_SHIFT;
 479 }
 480
 481 static void __init reserve_crashkernel(void)
 482 {
 483         unsigned long long total_mem;
 484         unsigned long long crash_size, crash_base;
 485         int ret;
 486
 487         total_mem = get_total_mem();
 488
 489         ret = parse_crashkernel(boot_command_line, total_mem,
 490                         &crash_size, &crash_base);
 491         if (ret != 0 || crash_size <= 0)
 492                 return;
 493
 494         /* 0 means: find the address automatically */
 495         if (crash_base <= 0) {
 496                 crash_base = find_and_reserve_crashkernel(crash_size);
 497                 if (crash_base == -1ULL) {
 498                         pr_info("crashkernel reservation failed. "
 499                                 "No suitable area found.\n");
 500                         return;
 501                 }
 502         } else {
 503                 ret = reserve_bootmem_generic(crash_base, crash_size,
 504                                         BOOTMEM_EXCLUSIVE);
 505                 if (ret < 0) {
 506                         pr_info("crashkernel reservation failed - "
 507                                 "memory is in use\n");
 508                         return;
 509                 }
 510         }
 511
 512         printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
 513                         "for crashkernel (System RAM: %ldMB)\n",
 514                         (unsigned long)(crash_size >> 20),
 515                         (unsigned long)(crash_base >> 20),
 516                         (unsigned long)(total_mem >> 20));
 517
 518         crashk_res.start = crash_base;
 519         crashk_res.end   = crash_base + crash_size - 1;
 520         insert_resource(&iomem_resource, &crashk_res);
 521 }
 522 #else
 523 static void __init reserve_crashkernel(void)
 524 {
 525 }
 526 #endif
 527
 528 static struct resource standard_io_resources[] = {
 529         { .name = "dma1", .start = 0x00, .end = 0x1f,
 530                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 531         { .name = "pic1", .start = 0x20, .end = 0x21,
 532                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 533         { .name = "timer0", .start = 0x40, .end = 0x43,
 534                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 535         { .name = "timer1", .start = 0x50, .end = 0x53,
 536                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 537         { .name = "keyboard", .start = 0x60, .end = 0x60,
 538                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 539         { .name = "keyboard", .start = 0x64, .end = 0x64,
 540                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 541         { .name = "dma page reg", .start = 0x80, .end = 0x8f,
 542                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 543         { .name = "pic2", .start = 0xa0, .end = 0xa1,
 544                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 545         { .name = "dma2", .start = 0xc0, .end = 0xdf,
 546                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 547         { .name = "fpu", .start = 0xf0, .end = 0xff,
 548                 .flags = IORESOURCE_BUSY | IORESOURCE_IO }
 549 };
 550
 551 static void __init reserve_standard_io_resources(void)
 552 {
 553         int i;
 554
 555         /* request I/O space for devices used on all i[345]86 PCs */
 556         for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
 557                 request_resource(&ioport_resource, &standard_io_resources[i]);
 558
 559 }
 560
 561 #ifdef CONFIG_PROC_VMCORE
 562 /* elfcorehdr= specifies the location of elf core header
 563  * stored by the crashed kernel. This option will be passed
 564  * by kexec loader to the capture kernel.
 565  */
 566 static int __init setup_elfcorehdr(char *arg)
 567 {
 568         char *end;
 569         if (!arg)
 570                 return -EINVAL;
 571         elfcorehdr_addr = memparse(arg, &end);
 572         return end > arg ? 0 : -EINVAL;
 573 }
 574 early_param("elfcorehdr", setup_elfcorehdr);
 575 #endif
 576
 577 static struct x86_quirks default_x86_quirks __initdata;
 578
 579 struct x86_quirks *x86_quirks __initdata = &default_x86_quirks;
 580
 581 /*
 582  * Some BIOSes seem to corrupt the low 64k of memory during events
 583  * like suspend/resume and unplugging an HDMI cable.  Reserve all
 584  * remaining free memory in that area and fill it with a distinct
 585  * pattern.
 586  */
 587 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
 588 #define MAX_SCAN_AREAS  8
 589 static struct e820entry scan_areas[MAX_SCAN_AREAS];
 590 static int num_scan_areas;
 591
 592 static void __init setup_bios_corruption_check(void)
 593 {
 594         u64 addr = PAGE_SIZE;   /* assume first page is reserved anyway */
 595
 596         while(addr < 0x10000 && num_scan_areas < MAX_SCAN_AREAS) {
 597                 u64 size;
 598                 addr = find_e820_area_size(addr, &size, PAGE_SIZE);
 599
 600                 if (addr == 0)
 601                         break;
 602
 603                 if ((addr + size) > 0x10000)
 604                         size = 0x10000 - addr;
 605
 606                 if (size == 0)
 607                         break;
 608
 609                 e820_update_range(addr, size, E820_RAM, E820_RESERVED);
 610                 scan_areas[num_scan_areas].addr = addr;
 611                 scan_areas[num_scan_areas].size = size;
 612                 num_scan_areas++;
 613
 614                 /* Assume we've already mapped this early memory */
 615                 memset(__va(addr), 0, size);
 616
 617                 addr += size;
 618         }
 619
 620         printk(KERN_INFO "scanning %d areas for BIOS corruption\n",
 621                num_scan_areas);
 622         update_e820();
 623 }
 624
 625 static int __read_mostly bios_corruption_check = 1;
 626
 627 void check_for_bios_corruption(void)
 628 {
 629         int i;
 630         int corruption = 0;
 631
 632         if (!bios_corruption_check)
 633                 return;
 634
 635         for(i = 0; i < num_scan_areas; i++) {
 636                 unsigned long *addr = __va(scan_areas[i].addr);
 637                 unsigned long size = scan_areas[i].size;
 638
 639                 for(; size; addr++, size -= sizeof(unsigned long)) {
 640                         if (!*addr)
 641                                 continue;
 642                         printk(KERN_ERR "Corrupted low memory at %p (%lx phys) = %08lx\n",
 643                                addr, __pa(addr), *addr);
 644                         corruption = 1;
 645                         *addr = 0;
 646                 }
 647         }
 648
 649         if (corruption)
 650                 dump_stack();
 651 }
 652
 653 static int set_bios_corruption_check(char *arg)
 654 {
 655         char *end;
 656
 657         bios_corruption_check = simple_strtol(arg, &end, 10);
 658
 659         return (*end == 0) ? 0 : -EINVAL;
 660 }
 661 early_param("bios_corruption_check", set_bios_corruption_check);
 662 #endif
 663
 664 /*
 665  * Determine if we were loaded by an EFI loader.  If so, then we have also been
 666  * passed the efi memmap, systab, etc., so we should use these data structures
 667  * for initialization.  Note, the efi init code path is determined by the
 668  * global efi_enabled. This allows the same kernel image to be used on existing
 669  * systems (with a traditional BIOS) as well as on EFI systems.
 670  */
 671 /*
 672  * setup_arch - architecture-specific boot-time initializations
 673  *
 674  * Note: On x86_64, fixmaps are ready for use even before this is called.
 675  */
 676
 677 void __init setup_arch(char **cmdline_p)
 678 {
 679 #ifdef CONFIG_X86_32
 680         memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
 681         visws_early_detect();
 682         pre_setup_arch_hook();
 683 #else
 684         printk(KERN_INFO "Command line: %s\n", boot_command_line);
 685 #endif
 686
 687         early_cpu_init();
 688         early_ioremap_init();
 689
 690         ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
 691         screen_info = boot_params.screen_info;
 692         edid_info = boot_params.edid_info;
 693 #ifdef CONFIG_X86_32
 694         apm_info.bios = boot_params.apm_bios_info;
 695         ist_info = boot_params.ist_info;
 696         if (boot_params.sys_desc_table.length != 0) {
 697                 set_mca_bus(boot_params.sys_desc_table.table[3] & 0x2);
 698                 machine_id = boot_params.sys_desc_table.table[0];
 699                 machine_submodel_id = boot_params.sys_desc_table.table[1];
 700                 BIOS_revision = boot_params.sys_desc_table.table[2];
 701         }
 702 #endif
 703         saved_video_mode = boot_params.hdr.vid_mode;
 704         bootloader_type = boot_params.hdr.type_of_loader;
 705
 706 #ifdef CONFIG_BLK_DEV_RAM
 707         rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
 708         rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
 709         rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
 710 #endif
 711 #ifdef CONFIG_EFI
 712         if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
 713 #ifdef CONFIG_X86_32
 714                      "EL32",
 715 #else
 716                      "EL64",
 717 #endif
 718          4)) {
 719                 efi_enabled = 1;
 720                 efi_reserve_early();
 721         }
 722 #endif
 723
 724         ARCH_SETUP
 725
 726         setup_memory_map();
 727         parse_setup_data();
 728         /* update the e820_saved too */
 729         e820_reserve_setup_data();
 730
 731         copy_edd();
 732
 733         if (!boot_params.hdr.root_flags)
 734                 root_mountflags &= ~MS_RDONLY;
 735         init_mm.start_code = (unsigned long) _text;
 736         init_mm.end_code = (unsigned long) _etext;
 737         init_mm.end_data = (unsigned long) _edata;
 738 #ifdef CONFIG_X86_32
 739         init_mm.brk = init_pg_tables_end + PAGE_OFFSET;
 740 #else
 741         init_mm.brk = (unsigned long) &_end;
 742 #endif
 743
 744         code_resource.start = virt_to_phys(_text);
 745         code_resource.end = virt_to_phys(_etext)-1;
 746         data_resource.start = virt_to_phys(_etext);
 747         data_resource.end = virt_to_phys(_edata)-1;
 748         bss_resource.start = virt_to_phys(&__bss_start);
 749         bss_resource.end = virt_to_phys(&__bss_stop)-1;
 750
 751         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 752         *cmdline_p = command_line;
 753
 754         parse_early_param();
 755
 756 #if defined(CONFIG_VMI) && defined(CONFIG_X86_32)
 757         /*
 758          * Must be before kernel pagetables are setup
 759          * or fixmap area is touched.
 760          */
 761         vmi_init();
 762 #endif
 763
 764         /* after early param, so could get panic from serial */
 765         reserve_early_setup_data();
 766
 767         if (acpi_mps_check()) {
 768 #ifdef CONFIG_X86_LOCAL_APIC
 769                 disable_apic = 1;
 770 #endif
 771                 setup_clear_cpu_cap(X86_FEATURE_APIC);
 772         }
 773
 774 #ifdef CONFIG_PCI
 775         if (pci_early_dump_regs)
 776                 early_dump_pci_devices();
 777 #endif
 778
 779         finish_e820_parsing();
 780
 781 #ifdef CONFIG_X86_32
 782         probe_roms();
 783 #endif
 784
 785         /* after parse_early_param, so could debug it */
 786         insert_resource(&iomem_resource, &code_resource);
 787         insert_resource(&iomem_resource, &data_resource);
 788         insert_resource(&iomem_resource, &bss_resource);
 789
 790         if (efi_enabled)
 791                 efi_init();
 792
 793 #ifdef CONFIG_X86_32
 794         if (ppro_with_ram_bug()) {
 795                 e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM,
 796                                   E820_RESERVED);
 797                 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 798                 printk(KERN_INFO "fixed physical RAM map:\n");
 799                 e820_print_map("bad_ppro");
 800         }
 801 #else
 802         early_gart_iommu_check();
 803 #endif
 804
 805         /*
 806          * partially used pages are not usable - thus
 807          * we are rounding upwards:
 808          */
 809         max_pfn = e820_end_of_ram_pfn();
 810
 811         /* preallocate 4k for mptable mpc */
 812         early_reserve_e820_mpc_new();
 813         /* update e820 for memory not covered by WB MTRRs */
 814         mtrr_bp_init();
 815         if (mtrr_trim_uncached_memory(max_pfn))
 816                 max_pfn = e820_end_of_ram_pfn();
 817
 818 #ifdef CONFIG_X86_32
 819         /* max_low_pfn get updated here */
 820         find_low_pfn_range();
 821 #else
 822         num_physpages = max_pfn;
 823
 824         check_efer();
 825
 826         /* How many end-of-memory variables you have, grandma! */
 827         /* need this before calling reserve_initrd */
 828         if (max_pfn > (1UL<<(32 - PAGE_SHIFT)))
 829                 max_low_pfn = e820_end_of_low_ram_pfn();
 830         else
 831                 max_low_pfn = max_pfn;
 832
 833         high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
 834 #endif
 835
 836 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
 837         setup_bios_corruption_check();
 838 #endif
 839
 840         /* max_pfn_mapped is updated here */
 841         max_low_pfn_mapped = init_memory_mapping(0, max_low_pfn<<PAGE_SHIFT);
 842         max_pfn_mapped = max_low_pfn_mapped;
 843
 844 #ifdef CONFIG_X86_64
 845         if (max_pfn > max_low_pfn) {
 846                 max_pfn_mapped = init_memory_mapping(1UL<<32,
 847                                                      max_pfn<<PAGE_SHIFT);
 848                 /* can we preseve max_low_pfn ?*/
 849                 max_low_pfn = max_pfn;
 850         }
 851 #endif
 852
 853         /*
 854          * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
 855          */
 856
 857 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
 858         if (init_ohci1394_dma_early)
 859                 init_ohci1394_dma_on_all_controllers();
 860 #endif
 861
 862         reserve_initrd();
 863
 864 #ifdef CONFIG_X86_64
 865         vsmp_init();
 866 #endif
 867
 868         dmi_scan_machine();
 869
 870         io_delay_init();
 871
 872         /*
 873          * Parse the ACPI tables for possible boot-time SMP configuration.
 874          */
 875         acpi_boot_table_init();
 876
 877 #ifdef CONFIG_ACPI_NUMA
 878         /*
 879          * Parse SRAT to discover nodes.
 880          */
 881         acpi_numa_init();
 882 #endif
 883
 884         initmem_init(0, max_pfn);
 885
 886 #ifdef CONFIG_ACPI_SLEEP
 887         /*
 888          * Reserve low memory region for sleep support.
 889          */
 890         acpi_reserve_bootmem();
 891 #endif
 892 #ifdef CONFIG_X86_FIND_SMP_CONFIG
 893         /*
 894          * Find and reserve possible boot-time SMP configuration:
 895          */
 896         find_smp_config();
 897 #endif
 898         reserve_crashkernel();
 899
 900 #ifdef CONFIG_X86_64
 901         /*
 902          * dma32_reserve_bootmem() allocates bootmem which may conflict
 903          * with the crashkernel command line, so do that after
 904          * reserve_crashkernel()
 905          */
 906         dma32_reserve_bootmem();
 907 #endif
 908
 909         reserve_ibft_region();
 910
 911 #ifdef CONFIG_KVM_CLOCK
 912         kvmclock_init();
 913 #endif
 914
 915         paravirt_pagetable_setup_start(swapper_pg_dir);
 916         paging_init();
 917         paravirt_pagetable_setup_done(swapper_pg_dir);
 918         paravirt_post_allocator_init();
 919
 920 #ifdef CONFIG_X86_64
 921         map_vsyscall();
 922 #endif
 923
 924 #ifdef CONFIG_X86_GENERICARCH
 925         generic_apic_probe();
 926 #endif
 927
 928         early_quirks();
 929
 930         /*
 931          * Read APIC and some other early information from ACPI tables.
 932          */
 933         acpi_boot_init();
 934
 935 #if defined(CONFIG_X86_MPPARSE) || defined(CONFIG_X86_VISWS)
 936         /*
 937          * get boot-time SMP configuration:
 938          */
 939         if (smp_found_config)
 940                 get_smp_config();
 941 #endif
 942
 943         prefill_possible_map();
 944 #ifdef CONFIG_X86_64
 945         init_cpu_to_node();
 946 #endif
 947
 948         init_apic_mappings();
 949         ioapic_init_mappings();
 950
 951         kvm_guest_init();
 952
 953         e820_reserve_resources();
 954         e820_mark_nosave_regions(max_low_pfn);
 955
 956 #ifdef CONFIG_X86_32
 957         request_resource(&iomem_resource, &video_ram_resource);
 958 #endif
 959         reserve_standard_io_resources();
 960
 961         e820_setup_gap();
 962
 963 #ifdef CONFIG_VT
 964 #if defined(CONFIG_VGA_CONSOLE)
 965         if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
 966                 conswitchp = &vga_con;
 967 #elif defined(CONFIG_DUMMY_CONSOLE)
 968         conswitchp = &dummy_con;
 969 #endif
 970 #endif
 971 }