arch/x86/kernel/setup.c

   1 /*
   2  *  Copyright (C) 1995  Linus Torvalds
   3  *
   4  *  Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999
   5  *
   6  *  Memory region support
   7  *      David Parsons <orc@pell.chi.il.us>, July-August 1999
   8  *
   9  *  Added E820 sanitization routine (removes overlapping memory regions);
  10  *  Brian Moyle <bmoyle@mvista.com>, February 2001
  11  *
  12  * Moved CPU detection code to cpu/${cpu}.c
  13  *    Patrick Mochel <mochel@osdl.org>, March 2002
  14  *
  15  *  Provisions for empty E820 memory regions (reported by certain BIOSes).
  16  *  Alex Achenbach <xela@slit.de>, December 2002.
  17  *
  18  */
  19
  20 /*
  21  * This file handles the architecture-dependent parts of initialization
  22  */
  23
  24 #include <linux/sched.h>
  25 #include <linux/mm.h>
  26 #include <linux/mmzone.h>
  27 #include <linux/screen_info.h>
  28 #include <linux/ioport.h>
  29 #include <linux/acpi.h>
  30 #include <linux/sfi.h>
  31 #include <linux/apm_bios.h>
  32 #include <linux/initrd.h>
  33 #include <linux/bootmem.h>
  34 #include <linux/seq_file.h>
  35 #include <linux/console.h>
  36 #include <linux/mca.h>
  37 #include <linux/root_dev.h>
  38 #include <linux/highmem.h>
  39 #include <linux/module.h>
  40 #include <linux/efi.h>
  41 #include <linux/init.h>
  42 #include <linux/edd.h>
  43 #include <linux/iscsi_ibft.h>
  44 #include <linux/nodemask.h>
  45 #include <linux/kexec.h>
  46 #include <linux/dmi.h>
  47 #include <linux/pfn.h>
  48 #include <linux/pci.h>
  49 #include <asm/pci-direct.h>
  50 #include <linux/init_ohci1394_dma.h>
  51 #include <linux/kvm_para.h>
  52
  53 #include <linux/errno.h>
  54 #include <linux/kernel.h>
  55 #include <linux/stddef.h>
  56 #include <linux/unistd.h>
  57 #include <linux/ptrace.h>
  58 #include <linux/slab.h>
  59 #include <linux/user.h>
  60 #include <linux/delay.h>
  61
  62 #include <linux/kallsyms.h>
  63 #include <linux/cpufreq.h>
  64 #include <linux/dma-mapping.h>
  65 #include <linux/ctype.h>
  66 #include <linux/uaccess.h>
  67
  68 #include <linux/percpu.h>
  69 #include <linux/crash_dump.h>
  70 #include <linux/tboot.h>
  71
  72 #include <video/edid.h>
  73
  74 #include <asm/mtrr.h>
  75 #include <asm/apic.h>
  76 #include <asm/e820.h>
  77 #include <asm/mpspec.h>
  78 #include <asm/setup.h>
  79 #include <asm/efi.h>
  80 #include <asm/timer.h>
  81 #include <asm/i8259.h>
  82 #include <asm/sections.h>
  83 #include <asm/dmi.h>
  84 #include <asm/io_apic.h>
  85 #include <asm/ist.h>
  86 #include <asm/vmi.h>
  87 #include <asm/setup_arch.h>
  88 #include <asm/bios_ebda.h>
  89 #include <asm/cacheflush.h>
  90 #include <asm/processor.h>
  91 #include <asm/bugs.h>
  92
  93 #include <asm/system.h>
  94 #include <asm/vsyscall.h>
  95 #include <asm/cpu.h>
  96 #include <asm/desc.h>
  97 #include <asm/dma.h>
  98 #include <asm/iommu.h>
  99 #include <asm/gart.h>
 100 #include <asm/mmu_context.h>
 101 #include <asm/proto.h>
 102
 103 #include <asm/paravirt.h>
 104 #include <asm/hypervisor.h>
 105
 106 #include <asm/percpu.h>
 107 #include <asm/topology.h>
 108 #include <asm/apicdef.h>
 109 #ifdef CONFIG_X86_64
 110 #include <asm/numa_64.h>
 111 #endif
 112 #include <asm/mce.h>
 113
 114 /*
 115  * end_pfn only includes RAM, while max_pfn_mapped includes all e820 entries.
 116  * The direct mapping extends to max_pfn_mapped, so that we can directly access
 117  * apertures, ACPI and other tables without having to play with fixmaps.
 118  */
 119 unsigned long max_low_pfn_mapped;
 120 unsigned long max_pfn_mapped;
 121
 122 RESERVE_BRK(dmi_alloc, 65536);
 123
 124 unsigned int boot_cpu_id __read_mostly;
 125
 126 static __initdata unsigned long _brk_start = (unsigned long)__brk_base;
 127 unsigned long _brk_end = (unsigned long)__brk_base;
 128
 129 #ifdef CONFIG_X86_64
 130 int default_cpu_present_to_apicid(int mps_cpu)
 131 {
 132         return __default_cpu_present_to_apicid(mps_cpu);
 133 }
 134
 135 int default_check_phys_apicid_present(int phys_apicid)
 136 {
 137         return __default_check_phys_apicid_present(phys_apicid);
 138 }
 139 #endif
 140
 141 #ifndef CONFIG_DEBUG_BOOT_PARAMS
 142 struct boot_params __initdata boot_params;
 143 #else
 144 struct boot_params boot_params;
 145 #endif
 146
 147 /*
 148  * Machine setup..
 149  */
 150 static struct resource data_resource = {
 151         .name   = "Kernel data",
 152         .start  = 0,
 153         .end    = 0,
 154         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 155 };
 156
 157 static struct resource code_resource = {
 158         .name   = "Kernel code",
 159         .start  = 0,
 160         .end    = 0,
 161         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 162 };
 163
 164 static struct resource bss_resource = {
 165         .name   = "Kernel bss",
 166         .start  = 0,
 167         .end    = 0,
 168         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 169 };
 170
 171
 172 #ifdef CONFIG_X86_32
 173 /* cpu data as detected by the assembly code in head.S */
 174 struct cpuinfo_x86 new_cpu_data __cpuinitdata = {0, 0, 0, 0, -1, 1, 0, 0, -1};
 175 /* common cpu data for all cpus */
 176 struct cpuinfo_x86 boot_cpu_data __read_mostly = {0, 0, 0, 0, -1, 1, 0, 0, -1};
 177 EXPORT_SYMBOL(boot_cpu_data);
 178 static void set_mca_bus(int x)
 179 {
 180 #ifdef CONFIG_MCA
 181         MCA_bus = x;
 182 #endif
 183 }
 184
 185 unsigned int def_to_bigsmp;
 186
 187 /* for MCA, but anyone else can use it if they want */
 188 unsigned int machine_id;
 189 unsigned int machine_submodel_id;
 190 unsigned int BIOS_revision;
 191
 192 struct apm_info apm_info;
 193 EXPORT_SYMBOL(apm_info);
 194
 195 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
 196         defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
 197 struct ist_info ist_info;
 198 EXPORT_SYMBOL(ist_info);
 199 #else
 200 struct ist_info ist_info;
 201 #endif
 202
 203 #else
 204 struct cpuinfo_x86 boot_cpu_data __read_mostly = {
 205         .x86_phys_bits = MAX_PHYSMEM_BITS,
 206 };
 207 EXPORT_SYMBOL(boot_cpu_data);
 208 #endif
 209
 210
 211 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
 212 unsigned long mmu_cr4_features;
 213 #else
 214 unsigned long mmu_cr4_features = X86_CR4_PAE;
 215 #endif
 216
 217 /* Boot loader ID and version as integers, for the benefit of proc_dointvec */
 218 int bootloader_type, bootloader_version;
 219
 220 /*
 221  * Setup options
 222  */
 223 struct screen_info screen_info;
 224 EXPORT_SYMBOL(screen_info);
 225 struct edid_info edid_info;
 226 EXPORT_SYMBOL_GPL(edid_info);
 227
 228 extern int root_mountflags;
 229
 230 unsigned long saved_video_mode;
 231
 232 #define RAMDISK_IMAGE_START_MASK        0x07FF
 233 #define RAMDISK_PROMPT_FLAG             0x8000
 234 #define RAMDISK_LOAD_FLAG               0x4000
 235
 236 static char __initdata command_line[COMMAND_LINE_SIZE];
 237 #ifdef CONFIG_CMDLINE_BOOL
 238 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
 239 #endif
 240
 241 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
 242 struct edd edd;
 243 #ifdef CONFIG_EDD_MODULE
 244 EXPORT_SYMBOL(edd);
 245 #endif
 246 /**
 247  * copy_edd() - Copy the BIOS EDD information
 248  *              from boot_params into a safe place.
 249  *
 250  */
 251 static inline void copy_edd(void)
 252 {
 253      memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
 254             sizeof(edd.mbr_signature));
 255      memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
 256      edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
 257      edd.edd_info_nr = boot_params.eddbuf_entries;
 258 }
 259 #else
 260 static inline void copy_edd(void)
 261 {
 262 }
 263 #endif
 264
 265 void * __init extend_brk(size_t size, size_t align)
 266 {
 267         size_t mask = align - 1;
 268         void *ret;
 269
 270         BUG_ON(_brk_start == 0);
 271         BUG_ON(align & mask);
 272
 273         _brk_end = (_brk_end + mask) & ~mask;
 274         BUG_ON((char *)(_brk_end + size) > __brk_limit);
 275
 276         ret = (void *)_brk_end;
 277         _brk_end += size;
 278
 279         memset(ret, 0, size);
 280
 281         return ret;
 282 }
 283
 284 #ifdef CONFIG_X86_64
 285 static void __init init_gbpages(void)
 286 {
 287         if (direct_gbpages && cpu_has_gbpages)
 288                 printk(KERN_INFO "Using GB pages for direct mapping\n");
 289         else
 290                 direct_gbpages = 0;
 291 }
 292 #else
 293 static inline void init_gbpages(void)
 294 {
 295 }
 296 #endif
 297
 298 static void __init reserve_brk(void)
 299 {
 300         if (_brk_end > _brk_start)
 301                 reserve_early(__pa(_brk_start), __pa(_brk_end), "BRK");
 302
 303         /* Mark brk area as locked down and no longer taking any
 304            new allocations */
 305         _brk_start = 0;
 306 }
 307
 308 #ifdef CONFIG_BLK_DEV_INITRD
 309
 310 #define MAX_MAP_CHUNK   (NR_FIX_BTMAPS << PAGE_SHIFT)
 311 static void __init relocate_initrd(void)
 312 {
 313
 314         u64 ramdisk_image = boot_params.hdr.ramdisk_image;
 315         u64 ramdisk_size  = boot_params.hdr.ramdisk_size;
 316         u64 end_of_lowmem = max_low_pfn_mapped << PAGE_SHIFT;
 317         u64 ramdisk_here;
 318         unsigned long slop, clen, mapaddr;
 319         char *p, *q;
 320
 321         /* We need to move the initrd down into lowmem */
 322         ramdisk_here = find_e820_area(0, end_of_lowmem, ramdisk_size,
 323                                          PAGE_SIZE);
 324
 325         if (ramdisk_here == -1ULL)
 326                 panic("Cannot find place for new RAMDISK of size %lld\n",
 327                          ramdisk_size);
 328
 329         /* Note: this includes all the lowmem currently occupied by
 330            the initrd, we rely on that fact to keep the data intact. */
 331         reserve_early(ramdisk_here, ramdisk_here + ramdisk_size,
 332                          "NEW RAMDISK");
 333         initrd_start = ramdisk_here + PAGE_OFFSET;
 334         initrd_end   = initrd_start + ramdisk_size;
 335         printk(KERN_INFO "Allocated new RAMDISK: %08llx - %08llx\n",
 336                          ramdisk_here, ramdisk_here + ramdisk_size);
 337
 338         q = (char *)initrd_start;
 339
 340         /* Copy any lowmem portion of the initrd */
 341         if (ramdisk_image < end_of_lowmem) {
 342                 clen = end_of_lowmem - ramdisk_image;
 343                 p = (char *)__va(ramdisk_image);
 344                 memcpy(q, p, clen);
 345                 q += clen;
 346                 ramdisk_image += clen;
 347                 ramdisk_size  -= clen;
 348         }
 349
 350         /* Copy the highmem portion of the initrd */
 351         while (ramdisk_size) {
 352                 slop = ramdisk_image & ~PAGE_MASK;
 353                 clen = ramdisk_size;
 354                 if (clen > MAX_MAP_CHUNK-slop)
 355                         clen = MAX_MAP_CHUNK-slop;
 356                 mapaddr = ramdisk_image & PAGE_MASK;
 357                 p = early_memremap(mapaddr, clen+slop);
 358                 memcpy(q, p+slop, clen);
 359                 early_iounmap(p, clen+slop);
 360                 q += clen;
 361                 ramdisk_image += clen;
 362                 ramdisk_size  -= clen;
 363         }
 364         /* high pages is not converted by early_res_to_bootmem */
 365         ramdisk_image = boot_params.hdr.ramdisk_image;
 366         ramdisk_size  = boot_params.hdr.ramdisk_size;
 367         printk(KERN_INFO "Move RAMDISK from %016llx - %016llx to"
 368                 " %08llx - %08llx\n",
 369                 ramdisk_image, ramdisk_image + ramdisk_size - 1,
 370                 ramdisk_here, ramdisk_here + ramdisk_size - 1);
 371 }
 372
 373 static void __init reserve_initrd(void)
 374 {
 375         u64 ramdisk_image = boot_params.hdr.ramdisk_image;
 376         u64 ramdisk_size  = boot_params.hdr.ramdisk_size;
 377         u64 ramdisk_end   = ramdisk_image + ramdisk_size;
 378         u64 end_of_lowmem = max_low_pfn_mapped << PAGE_SHIFT;
 379
 380         if (!boot_params.hdr.type_of_loader ||
 381             !ramdisk_image || !ramdisk_size)
 382                 return;         /* No initrd provided by bootloader */
 383
 384         initrd_start = 0;
 385
 386         if (ramdisk_size >= (end_of_lowmem>>1)) {
 387                 free_early(ramdisk_image, ramdisk_end);
 388                 printk(KERN_ERR "initrd too large to handle, "
 389                        "disabling initrd\n");
 390                 return;
 391         }
 392
 393         printk(KERN_INFO "RAMDISK: %08llx - %08llx\n", ramdisk_image,
 394                         ramdisk_end);
 395
 396
 397         if (ramdisk_end <= end_of_lowmem) {
 398                 /* All in lowmem, easy case */
 399                 /*
 400                  * don't need to reserve again, already reserved early
 401                  * in i386_start_kernel
 402                  */
 403                 initrd_start = ramdisk_image + PAGE_OFFSET;
 404                 initrd_end = initrd_start + ramdisk_size;
 405                 return;
 406         }
 407
 408         relocate_initrd();
 409
 410         free_early(ramdisk_image, ramdisk_end);
 411 }
 412 #else
 413 static void __init reserve_initrd(void)
 414 {
 415 }
 416 #endif /* CONFIG_BLK_DEV_INITRD */
 417
 418 static void __init parse_setup_data(void)
 419 {
 420         struct setup_data *data;
 421         u64 pa_data;
 422
 423         if (boot_params.hdr.version < 0x0209)
 424                 return;
 425         pa_data = boot_params.hdr.setup_data;
 426         while (pa_data) {
 427                 data = early_memremap(pa_data, PAGE_SIZE);
 428                 switch (data->type) {
 429                 case SETUP_E820_EXT:
 430                         parse_e820_ext(data, pa_data);
 431                         break;
 432                 default:
 433                         break;
 434                 }
 435                 pa_data = data->next;
 436                 early_iounmap(data, PAGE_SIZE);
 437         }
 438 }
 439
 440 static void __init e820_reserve_setup_data(void)
 441 {
 442         struct setup_data *data;
 443         u64 pa_data;
 444         int found = 0;
 445
 446         if (boot_params.hdr.version < 0x0209)
 447                 return;
 448         pa_data = boot_params.hdr.setup_data;
 449         while (pa_data) {
 450                 data = early_memremap(pa_data, sizeof(*data));
 451                 e820_update_range(pa_data, sizeof(*data)+data->len,
 452                          E820_RAM, E820_RESERVED_KERN);
 453                 found = 1;
 454                 pa_data = data->next;
 455                 early_iounmap(data, sizeof(*data));
 456         }
 457         if (!found)
 458                 return;
 459
 460         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 461         memcpy(&e820_saved, &e820, sizeof(struct e820map));
 462         printk(KERN_INFO "extended physical RAM map:\n");
 463         e820_print_map("reserve setup_data");
 464 }
 465
 466 static void __init reserve_early_setup_data(void)
 467 {
 468         struct setup_data *data;
 469         u64 pa_data;
 470         char buf[32];
 471
 472         if (boot_params.hdr.version < 0x0209)
 473                 return;
 474         pa_data = boot_params.hdr.setup_data;
 475         while (pa_data) {
 476                 data = early_memremap(pa_data, sizeof(*data));
 477                 sprintf(buf, "setup data %x", data->type);
 478                 reserve_early(pa_data, pa_data+sizeof(*data)+data->len, buf);
 479                 pa_data = data->next;
 480                 early_iounmap(data, sizeof(*data));
 481         }
 482 }
 483
 484 /*
 485  * --------- Crashkernel reservation ------------------------------
 486  */
 487
 488 #ifdef CONFIG_KEXEC
 489
 490 /**
 491  * Reserve @size bytes of crashkernel memory at any suitable offset.
 492  *
 493  * @size: Size of the crashkernel memory to reserve.
 494  * Returns the base address on success, and -1ULL on failure.
 495  */
 496 static
 497 unsigned long long __init find_and_reserve_crashkernel(unsigned long long size)
 498 {
 499         const unsigned long long alignment = 16<<20;    /* 16M */
 500         unsigned long long start = 0LL;
 501
 502         while (1) {
 503                 int ret;
 504
 505                 start = find_e820_area(start, ULONG_MAX, size, alignment);
 506                 if (start == -1ULL)
 507                         return start;
 508
 509                 /* try to reserve it */
 510                 ret = reserve_bootmem_generic(start, size, BOOTMEM_EXCLUSIVE);
 511                 if (ret >= 0)
 512                         return start;
 513
 514                 start += alignment;
 515         }
 516 }
 517
 518 static inline unsigned long long get_total_mem(void)
 519 {
 520         unsigned long long total;
 521
 522         total = max_low_pfn - min_low_pfn;
 523 #ifdef CONFIG_HIGHMEM
 524         total += highend_pfn - highstart_pfn;
 525 #endif
 526
 527         return total << PAGE_SHIFT;
 528 }
 529
 530 static void __init reserve_crashkernel(void)
 531 {
 532         unsigned long long total_mem;
 533         unsigned long long crash_size, crash_base;
 534         int ret;
 535
 536         total_mem = get_total_mem();
 537
 538         ret = parse_crashkernel(boot_command_line, total_mem,
 539                         &crash_size, &crash_base);
 540         if (ret != 0 || crash_size <= 0)
 541                 return;
 542
 543         /* 0 means: find the address automatically */
 544         if (crash_base <= 0) {
 545                 crash_base = find_and_reserve_crashkernel(crash_size);
 546                 if (crash_base == -1ULL) {
 547                         pr_info("crashkernel reservation failed. "
 548                                 "No suitable area found.\n");
 549                         return;
 550                 }
 551         } else {
 552                 ret = reserve_bootmem_generic(crash_base, crash_size,
 553                                         BOOTMEM_EXCLUSIVE);
 554                 if (ret < 0) {
 555                         pr_info("crashkernel reservation failed - "
 556                                 "memory is in use\n");
 557                         return;
 558                 }
 559         }
 560
 561         printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
 562                         "for crashkernel (System RAM: %ldMB)\n",
 563                         (unsigned long)(crash_size >> 20),
 564                         (unsigned long)(crash_base >> 20),
 565                         (unsigned long)(total_mem >> 20));
 566
 567         crashk_res.start = crash_base;
 568         crashk_res.end   = crash_base + crash_size - 1;
 569         insert_resource(&iomem_resource, &crashk_res);
 570 }
 571 #else
 572 static void __init reserve_crashkernel(void)
 573 {
 574 }
 575 #endif
 576
 577 static struct resource standard_io_resources[] = {
 578         { .name = "dma1", .start = 0x00, .end = 0x1f,
 579                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 580         { .name = "pic1", .start = 0x20, .end = 0x21,
 581                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 582         { .name = "timer0", .start = 0x40, .end = 0x43,
 583                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 584         { .name = "timer1", .start = 0x50, .end = 0x53,
 585                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 586         { .name = "keyboard", .start = 0x60, .end = 0x60,
 587                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 588         { .name = "keyboard", .start = 0x64, .end = 0x64,
 589                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 590         { .name = "dma page reg", .start = 0x80, .end = 0x8f,
 591                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 592         { .name = "pic2", .start = 0xa0, .end = 0xa1,
 593                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 594         { .name = "dma2", .start = 0xc0, .end = 0xdf,
 595                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 596         { .name = "fpu", .start = 0xf0, .end = 0xff,
 597                 .flags = IORESOURCE_BUSY | IORESOURCE_IO }
 598 };
 599
 600 void __init reserve_standard_io_resources(void)
 601 {
 602         int i;
 603
 604         /* request I/O space for devices used on all i[345]86 PCs */
 605         for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
 606                 request_resource(&ioport_resource, &standard_io_resources[i]);
 607
 608 }
 609
 610 /*
 611  * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
 612  * is_kdump_kernel() to determine if we are booting after a panic. Hence
 613  * ifdef it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
 614  */
 615
 616 #ifdef CONFIG_CRASH_DUMP
 617 /* elfcorehdr= specifies the location of elf core header
 618  * stored by the crashed kernel. This option will be passed
 619  * by kexec loader to the capture kernel.
 620  */
 621 static int __init setup_elfcorehdr(char *arg)
 622 {
 623         char *end;
 624         if (!arg)
 625                 return -EINVAL;
 626         elfcorehdr_addr = memparse(arg, &end);
 627         return end > arg ? 0 : -EINVAL;
 628 }
 629 early_param("elfcorehdr", setup_elfcorehdr);
 630 #endif
 631
 632 #ifdef CONFIG_X86_RESERVE_LOW_64K
 633 static int __init dmi_low_memory_corruption(const struct dmi_system_id *d)
 634 {
 635         printk(KERN_NOTICE
 636                 "%s detected: BIOS may corrupt low RAM, working around it.\n",
 637                 d->ident);
 638
 639         e820_update_range(0, 0x10000, E820_RAM, E820_RESERVED);
 640         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 641
 642         return 0;
 643 }
 644 #endif
 645
 646 /* List of systems that have known low memory corruption BIOS problems */
 647 static struct dmi_system_id __initdata bad_bios_dmi_table[] = {
 648 #ifdef CONFIG_X86_RESERVE_LOW_64K
 649         {
 650                 .callback = dmi_low_memory_corruption,
 651                 .ident = "AMI BIOS",
 652                 .matches = {
 653                         DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
 654                 },
 655         },
 656         {
 657                 .callback = dmi_low_memory_corruption,
 658                 .ident = "Phoenix BIOS",
 659                 .matches = {
 660                         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies"),
 661                 },
 662         },
 663         {
 664         /*
 665          * AMI BIOS with low memory corruption was found on Intel DG45ID board.
 666          * It hase different DMI_BIOS_VENDOR = "Intel Corp.", for now we will
 667          * match only DMI_BOARD_NAME and see if there is more bad products
 668          * with this vendor.
 669          */
 670                 .callback = dmi_low_memory_corruption,
 671                 .ident = "AMI BIOS",
 672                 .matches = {
 673                         DMI_MATCH(DMI_BOARD_NAME, "DG45ID"),
 674                 },
 675         },
 676 #endif
 677         {}
 678 };
 679
 680 /*
 681  * Determine if we were loaded by an EFI loader.  If so, then we have also been
 682  * passed the efi memmap, systab, etc., so we should use these data structures
 683  * for initialization.  Note, the efi init code path is determined by the
 684  * global efi_enabled. This allows the same kernel image to be used on existing
 685  * systems (with a traditional BIOS) as well as on EFI systems.
 686  */
 687 /*
 688  * setup_arch - architecture-specific boot-time initializations
 689  *
 690  * Note: On x86_64, fixmaps are ready for use even before this is called.
 691  */
 692
 693 void __init setup_arch(char **cmdline_p)
 694 {
 695 #ifdef CONFIG_X86_32
 696         memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
 697         visws_early_detect();
 698 #else
 699         printk(KERN_INFO "Command line: %s\n", boot_command_line);
 700 #endif
 701
 702         /* VMI may relocate the fixmap; do this before touching ioremap area */
 703         vmi_init();
 704
 705         early_cpu_init();
 706         early_ioremap_init();
 707
 708         ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
 709         screen_info = boot_params.screen_info;
 710         edid_info = boot_params.edid_info;
 711 #ifdef CONFIG_X86_32
 712         apm_info.bios = boot_params.apm_bios_info;
 713         ist_info = boot_params.ist_info;
 714         if (boot_params.sys_desc_table.length != 0) {
 715                 set_mca_bus(boot_params.sys_desc_table.table[3] & 0x2);
 716                 machine_id = boot_params.sys_desc_table.table[0];
 717                 machine_submodel_id = boot_params.sys_desc_table.table[1];
 718                 BIOS_revision = boot_params.sys_desc_table.table[2];
 719         }
 720 #endif
 721         saved_video_mode = boot_params.hdr.vid_mode;
 722         bootloader_type = boot_params.hdr.type_of_loader;
 723         if ((bootloader_type >> 4) == 0xe) {
 724                 bootloader_type &= 0xf;
 725                 bootloader_type |= (boot_params.hdr.ext_loader_type+0x10) << 4;
 726         }
 727         bootloader_version  = bootloader_type & 0xf;
 728         bootloader_version |= boot_params.hdr.ext_loader_ver << 4;
 729
 730 #ifdef CONFIG_BLK_DEV_RAM
 731         rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
 732         rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
 733         rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
 734 #endif
 735 #ifdef CONFIG_EFI
 736         if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
 737 #ifdef CONFIG_X86_32
 738                      "EL32",
 739 #else
 740                      "EL64",
 741 #endif
 742          4)) {
 743                 efi_enabled = 1;
 744                 efi_reserve_early();
 745         }
 746 #endif
 747
 748         x86_init.oem.arch_setup();
 749
 750         setup_memory_map();
 751         parse_setup_data();
 752         /* update the e820_saved too */
 753         e820_reserve_setup_data();
 754
 755         copy_edd();
 756
 757         if (!boot_params.hdr.root_flags)
 758                 root_mountflags &= ~MS_RDONLY;
 759         init_mm.start_code = (unsigned long) _text;
 760         init_mm.end_code = (unsigned long) _etext;
 761         init_mm.end_data = (unsigned long) _edata;
 762         init_mm.brk = _brk_end;
 763
 764         code_resource.start = virt_to_phys(_text);
 765         code_resource.end = virt_to_phys(_etext)-1;
 766         data_resource.start = virt_to_phys(_etext);
 767         data_resource.end = virt_to_phys(_edata)-1;
 768         bss_resource.start = virt_to_phys(&__bss_start);
 769         bss_resource.end = virt_to_phys(&__bss_stop)-1;
 770
 771 #ifdef CONFIG_CMDLINE_BOOL
 772 #ifdef CONFIG_CMDLINE_OVERRIDE
 773         strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 774 #else
 775         if (builtin_cmdline[0]) {
 776                 /* append boot loader cmdline to builtin */
 777                 strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE);
 778                 strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE);
 779                 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 780         }
 781 #endif
 782 #endif
 783
 784         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 785         *cmdline_p = command_line;
 786
 787 #ifdef CONFIG_X86_64
 788         /*
 789          * Must call this twice: Once just to detect whether hardware doesn't
 790          * support NX (so that the early EHCI debug console setup can safely
 791          * call set_fixmap(), and then again after parsing early parameters to
 792          * honor the respective command line option.
 793          */
 794         check_efer();
 795 #endif
 796
 797         parse_early_param();
 798
 799 #ifdef CONFIG_X86_64
 800         check_efer();
 801 #endif
 802
 803         /* Must be before kernel pagetables are setup */
 804         vmi_activate();
 805
 806         /* after early param, so could get panic from serial */
 807         reserve_early_setup_data();
 808
 809         if (acpi_mps_check()) {
 810 #ifdef CONFIG_X86_LOCAL_APIC
 811                 disable_apic = 1;
 812 #endif
 813                 setup_clear_cpu_cap(X86_FEATURE_APIC);
 814         }
 815
 816 #ifdef CONFIG_PCI
 817         if (pci_early_dump_regs)
 818                 early_dump_pci_devices();
 819 #endif
 820
 821         finish_e820_parsing();
 822
 823         if (efi_enabled)
 824                 efi_init();
 825
 826         dmi_scan_machine();
 827
 828         dmi_check_system(bad_bios_dmi_table);
 829
 830         /*
 831          * VMware detection requires dmi to be available, so this
 832          * needs to be done after dmi_scan_machine, for the BP.
 833          */
 834         init_hypervisor_platform();
 835
 836         x86_init.resources.probe_roms();
 837
 838         /* after parse_early_param, so could debug it */
 839         insert_resource(&iomem_resource, &code_resource);
 840         insert_resource(&iomem_resource, &data_resource);
 841         insert_resource(&iomem_resource, &bss_resource);
 842
 843
 844 #ifdef CONFIG_X86_32
 845         if (ppro_with_ram_bug()) {
 846                 e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM,
 847                                   E820_RESERVED);
 848                 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 849                 printk(KERN_INFO "fixed physical RAM map:\n");
 850                 e820_print_map("bad_ppro");
 851         }
 852 #else
 853         early_gart_iommu_check();
 854 #endif
 855
 856         /*
 857          * partially used pages are not usable - thus
 858          * we are rounding upwards:
 859          */
 860         max_pfn = e820_end_of_ram_pfn();
 861
 862         /* preallocate 4k for mptable mpc */
 863         early_reserve_e820_mpc_new();
 864         /* update e820 for memory not covered by WB MTRRs */
 865         mtrr_bp_init();
 866         if (mtrr_trim_uncached_memory(max_pfn))
 867                 max_pfn = e820_end_of_ram_pfn();
 868
 869 #ifdef CONFIG_X86_32
 870         /* max_low_pfn get updated here */
 871         find_low_pfn_range();
 872 #else
 873         num_physpages = max_pfn;
 874
 875         check_x2apic();
 876
 877         /* How many end-of-memory variables you have, grandma! */
 878         /* need this before calling reserve_initrd */
 879         if (max_pfn > (1UL<<(32 - PAGE_SHIFT)))
 880                 max_low_pfn = e820_end_of_low_ram_pfn();
 881         else
 882                 max_low_pfn = max_pfn;
 883
 884         high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
 885         max_pfn_mapped = KERNEL_IMAGE_SIZE >> PAGE_SHIFT;
 886 #endif
 887
 888 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
 889         setup_bios_corruption_check();
 890 #endif
 891
 892         printk(KERN_DEBUG "initial memory mapped : 0 - %08lx\n",
 893                         max_pfn_mapped<<PAGE_SHIFT);
 894
 895         reserve_brk();
 896
 897         init_gbpages();
 898
 899         /* max_pfn_mapped is updated here */
 900         max_low_pfn_mapped = init_memory_mapping(0, max_low_pfn<<PAGE_SHIFT);
 901         max_pfn_mapped = max_low_pfn_mapped;
 902
 903 #ifdef CONFIG_X86_64
 904         if (max_pfn > max_low_pfn) {
 905                 max_pfn_mapped = init_memory_mapping(1UL<<32,
 906                                                      max_pfn<<PAGE_SHIFT);
 907                 /* can we preseve max_low_pfn ?*/
 908                 max_low_pfn = max_pfn;
 909         }
 910 #endif
 911
 912         /*
 913          * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
 914          */
 915
 916 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
 917         if (init_ohci1394_dma_early)
 918                 init_ohci1394_dma_on_all_controllers();
 919 #endif
 920
 921         reserve_initrd();
 922
 923         vsmp_init();
 924
 925         io_delay_init();
 926
 927         /*
 928          * Parse the ACPI tables for possible boot-time SMP configuration.
 929          */
 930         acpi_boot_table_init();
 931
 932         early_acpi_boot_init();
 933
 934 #ifdef CONFIG_ACPI_NUMA
 935         /*
 936          * Parse SRAT to discover nodes.
 937          */
 938         acpi_numa_init();
 939 #endif
 940
 941         initmem_init(0, max_pfn);
 942
 943 #ifdef CONFIG_ACPI_SLEEP
 944         /*
 945          * Reserve low memory region for sleep support.
 946          */
 947         acpi_reserve_bootmem();
 948 #endif
 949         /*
 950          * Find and reserve possible boot-time SMP configuration:
 951          */
 952         find_smp_config();
 953
 954         reserve_crashkernel();
 955
 956 #ifdef CONFIG_X86_64
 957         /*
 958          * dma32_reserve_bootmem() allocates bootmem which may conflict
 959          * with the crashkernel command line, so do that after
 960          * reserve_crashkernel()
 961          */
 962         dma32_reserve_bootmem();
 963 #endif
 964
 965         reserve_ibft_region();
 966
 967 #ifdef CONFIG_KVM_CLOCK
 968         kvmclock_init();
 969 #endif
 970
 971         x86_init.paging.pagetable_setup_start(swapper_pg_dir);
 972         paging_init();
 973         x86_init.paging.pagetable_setup_done(swapper_pg_dir);
 974
 975         tboot_probe();
 976
 977 #ifdef CONFIG_X86_64
 978         map_vsyscall();
 979 #endif
 980
 981         generic_apic_probe();
 982
 983         early_quirks();
 984
 985         /*
 986          * Read APIC and some other early information from ACPI tables.
 987          */
 988         acpi_boot_init();
 989
 990         sfi_init();
 991
 992         /*
 993          * get boot-time SMP configuration:
 994          */
 995         if (smp_found_config)
 996                 get_smp_config();
 997
 998         prefill_possible_map();
 999
1000 #ifdef CONFIG_X86_64
1001         init_cpu_to_node();
1002 #endif
1003
1004         init_apic_mappings();
1005         ioapic_init_mappings();
1006
1007         /* need to wait for io_apic is mapped */
1008         probe_nr_irqs_gsi();
1009
1010         kvm_guest_init();
1011
1012         e820_reserve_resources();
1013         e820_mark_nosave_regions(max_low_pfn);
1014
1015         x86_init.resources.reserve_resources();
1016
1017         e820_setup_gap();
1018
1019 #ifdef CONFIG_VT
1020 #if defined(CONFIG_VGA_CONSOLE)
1021         if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
1022                 conswitchp = &vga_con;
1023 #elif defined(CONFIG_DUMMY_CONSOLE)
1024         conswitchp = &dummy_con;
1025 #endif
1026 #endif
1027         x86_init.oem.banner();
1028
1029         mcheck_init();
1030 }
1031
1032 #ifdef CONFIG_X86_32
1033
1034 static struct resource video_ram_resource = {
1035         .name   = "Video RAM area",
1036         .start  = 0xa0000,
1037         .end    = 0xbffff,
1038         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
1039 };
1040
1041 void __init i386_reserve_resources(void)
1042 {
1043         request_resource(&iomem_resource, &video_ram_resource);
1044         reserve_standard_io_resources();
1045 }
1046
1047 #endif /* CONFIG_X86_32 */