git.oblomov.eu Git - linux-2.6/blob - arch/i386/kernel/setup.c

   1 /*
   2  *  linux/arch/i386/kernel/setup.c
   3  *
   4  *  Copyright (C) 1995  Linus Torvalds
   5  *
   6  *  Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999
   7  *
   8  *  Memory region support
   9  *      David Parsons <orc@pell.chi.il.us>, July-August 1999
  10  *
  11  *  Added E820 sanitization routine (removes overlapping memory regions);
  12  *  Brian Moyle <bmoyle@mvista.com>, February 2001
  13  *
  14  * Moved CPU detection code to cpu/${cpu}.c
  15  *    Patrick Mochel <mochel@osdl.org>, March 2002
  16  *
  17  *  Provisions for empty E820 memory regions (reported by certain BIOSes).
  18  *  Alex Achenbach <xela@slit.de>, December 2002.
  19  *
  20  */
  21
  22 /*
  23  * This file handles the architecture-dependent parts of initialization
  24  */
  25
  26 #include <linux/config.h>
  27 #include <linux/sched.h>
  28 #include <linux/mm.h>
  29 #include <linux/mmzone.h>
  30 #include <linux/tty.h>
  31 #include <linux/ioport.h>
  32 #include <linux/acpi.h>
  33 #include <linux/apm_bios.h>
  34 #include <linux/initrd.h>
  35 #include <linux/bootmem.h>
  36 #include <linux/seq_file.h>
  37 #include <linux/console.h>
  38 #include <linux/mca.h>
  39 #include <linux/root_dev.h>
  40 #include <linux/highmem.h>
  41 #include <linux/module.h>
  42 #include <linux/efi.h>
  43 #include <linux/init.h>
  44 #include <linux/edd.h>
  45 #include <linux/nodemask.h>
  46 #include <linux/kexec.h>
  47 #include <linux/crash_dump.h>
  48 #include <linux/dmi.h>
  49
  50 #include <video/edid.h>
  51
  52 #include <asm/apic.h>
  53 #include <asm/e820.h>
  54 #include <asm/mpspec.h>
  55 #include <asm/setup.h>
  56 #include <asm/arch_hooks.h>
  57 #include <asm/sections.h>
  58 #include <asm/io_apic.h>
  59 #include <asm/ist.h>
  60 #include <asm/io.h>
  61 #include "setup_arch_pre.h"
  62 #include <bios_ebda.h>
  63
  64 /* Forward Declaration. */
  65 void __init find_max_pfn(void);
  66
  67 /* This value is set up by the early boot code to point to the value
  68    immediately after the boot time page tables.  It contains a *physical*
  69    address, and must not be in the .bss segment! */
  70 unsigned long init_pg_tables_end __initdata = ~0UL;
  71
  72 int disable_pse __devinitdata = 0;
  73
  74 /*
  75  * Machine setup..
  76  */
  77
  78 #ifdef CONFIG_EFI
  79 int efi_enabled = 0;
  80 EXPORT_SYMBOL(efi_enabled);
  81 #endif
  82
  83 /* cpu data as detected by the assembly code in head.S */
  84 struct cpuinfo_x86 new_cpu_data __initdata = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
  85 /* common cpu data for all cpus */
  86 struct cpuinfo_x86 boot_cpu_data __read_mostly = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
  87 EXPORT_SYMBOL(boot_cpu_data);
  88
  89 unsigned long mmu_cr4_features;
  90
  91 #ifdef  CONFIG_ACPI
  92         int acpi_disabled = 0;
  93 #else
  94         int acpi_disabled = 1;
  95 #endif
  96 EXPORT_SYMBOL(acpi_disabled);
  97
  98 #ifdef  CONFIG_ACPI
  99 int __initdata acpi_force = 0;
 100 extern acpi_interrupt_flags     acpi_sci_flags;
 101 #endif
 102
 103 /* for MCA, but anyone else can use it if they want */
 104 unsigned int machine_id;
 105 #ifdef CONFIG_MCA
 106 EXPORT_SYMBOL(machine_id);
 107 #endif
 108 unsigned int machine_submodel_id;
 109 unsigned int BIOS_revision;
 110 unsigned int mca_pentium_flag;
 111
 112 /* For PCI or other memory-mapped resources */
 113 unsigned long pci_mem_start = 0x10000000;
 114 #ifdef CONFIG_PCI
 115 EXPORT_SYMBOL(pci_mem_start);
 116 #endif
 117
 118 /* Boot loader ID as an integer, for the benefit of proc_dointvec */
 119 int bootloader_type;
 120
 121 /* user-defined highmem size */
 122 static unsigned int highmem_pages = -1;
 123
 124 /*
 125  * Setup options
 126  */
 127 struct drive_info_struct { char dummy[32]; } drive_info;
 128 #if defined(CONFIG_BLK_DEV_IDE) || defined(CONFIG_BLK_DEV_HD) || \
 129     defined(CONFIG_BLK_DEV_IDE_MODULE) || defined(CONFIG_BLK_DEV_HD_MODULE)
 130 EXPORT_SYMBOL(drive_info);
 131 #endif
 132 struct screen_info screen_info;
 133 EXPORT_SYMBOL(screen_info);
 134 struct apm_info apm_info;
 135 EXPORT_SYMBOL(apm_info);
 136 struct sys_desc_table_struct {
 137         unsigned short length;
 138         unsigned char table[0];
 139 };
 140 struct edid_info edid_info;
 141 EXPORT_SYMBOL_GPL(edid_info);
 142 struct ist_info ist_info;
 143 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
 144         defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
 145 EXPORT_SYMBOL(ist_info);
 146 #endif
 147 struct e820map e820;
 148
 149 extern void early_cpu_init(void);
 150 extern void generic_apic_probe(char *);
 151 extern int root_mountflags;
 152
 153 unsigned long saved_videomode;
 154
 155 #define RAMDISK_IMAGE_START_MASK        0x07FF
 156 #define RAMDISK_PROMPT_FLAG             0x8000
 157 #define RAMDISK_LOAD_FLAG               0x4000
 158
 159 static char command_line[COMMAND_LINE_SIZE];
 160
 161 unsigned char __initdata boot_params[PARAM_SIZE];
 162
 163 static struct resource data_resource = {
 164         .name   = "Kernel data",
 165         .start  = 0,
 166         .end    = 0,
 167         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 168 };
 169
 170 static struct resource code_resource = {
 171         .name   = "Kernel code",
 172         .start  = 0,
 173         .end    = 0,
 174         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 175 };
 176
 177 static struct resource system_rom_resource = {
 178         .name   = "System ROM",
 179         .start  = 0xf0000,
 180         .end    = 0xfffff,
 181         .flags  = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
 182 };
 183
 184 static struct resource extension_rom_resource = {
 185         .name   = "Extension ROM",
 186         .start  = 0xe0000,
 187         .end    = 0xeffff,
 188         .flags  = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
 189 };
 190
 191 static struct resource adapter_rom_resources[] = { {
 192         .name   = "Adapter ROM",
 193         .start  = 0xc8000,
 194         .end    = 0,
 195         .flags  = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
 196 }, {
 197         .name   = "Adapter ROM",
 198         .start  = 0,
 199         .end    = 0,
 200         .flags  = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
 201 }, {
 202         .name   = "Adapter ROM",
 203         .start  = 0,
 204         .end    = 0,
 205         .flags  = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
 206 }, {
 207         .name   = "Adapter ROM",
 208         .start  = 0,
 209         .end    = 0,
 210         .flags  = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
 211 }, {
 212         .name   = "Adapter ROM",
 213         .start  = 0,
 214         .end    = 0,
 215         .flags  = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
 216 }, {
 217         .name   = "Adapter ROM",
 218         .start  = 0,
 219         .end    = 0,
 220         .flags  = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
 221 } };
 222
 223 #define ADAPTER_ROM_RESOURCES \
 224         (sizeof adapter_rom_resources / sizeof adapter_rom_resources[0])
 225
 226 static struct resource video_rom_resource = {
 227         .name   = "Video ROM",
 228         .start  = 0xc0000,
 229         .end    = 0xc7fff,
 230         .flags  = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
 231 };
 232
 233 static struct resource video_ram_resource = {
 234         .name   = "Video RAM area",
 235         .start  = 0xa0000,
 236         .end    = 0xbffff,
 237         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 238 };
 239
 240 static struct resource standard_io_resources[] = { {
 241         .name   = "dma1",
 242         .start  = 0x0000,
 243         .end    = 0x001f,
 244         .flags  = IORESOURCE_BUSY | IORESOURCE_IO
 245 }, {
 246         .name   = "pic1",
 247         .start  = 0x0020,
 248         .end    = 0x0021,
 249         .flags  = IORESOURCE_BUSY | IORESOURCE_IO
 250 }, {
 251         .name   = "timer0",
 252         .start  = 0x0040,
 253         .end    = 0x0043,
 254         .flags  = IORESOURCE_BUSY | IORESOURCE_IO
 255 }, {
 256         .name   = "timer1",
 257         .start  = 0x0050,
 258         .end    = 0x0053,
 259         .flags  = IORESOURCE_BUSY | IORESOURCE_IO
 260 }, {
 261         .name   = "keyboard",
 262         .start  = 0x0060,
 263         .end    = 0x006f,
 264         .flags  = IORESOURCE_BUSY | IORESOURCE_IO
 265 }, {
 266         .name   = "dma page reg",
 267         .start  = 0x0080,
 268         .end    = 0x008f,
 269         .flags  = IORESOURCE_BUSY | IORESOURCE_IO
 270 }, {
 271         .name   = "pic2",
 272         .start  = 0x00a0,
 273         .end    = 0x00a1,
 274         .flags  = IORESOURCE_BUSY | IORESOURCE_IO
 275 }, {
 276         .name   = "dma2",
 277         .start  = 0x00c0,
 278         .end    = 0x00df,
 279         .flags  = IORESOURCE_BUSY | IORESOURCE_IO
 280 }, {
 281         .name   = "fpu",
 282         .start  = 0x00f0,
 283         .end    = 0x00ff,
 284         .flags  = IORESOURCE_BUSY | IORESOURCE_IO
 285 } };
 286
 287 #define STANDARD_IO_RESOURCES \
 288         (sizeof standard_io_resources / sizeof standard_io_resources[0])
 289
 290 #define romsignature(x) (*(unsigned short *)(x) == 0xaa55)
 291
 292 static int __init romchecksum(unsigned char *rom, unsigned long length)
 293 {
 294         unsigned char *p, sum = 0;
 295
 296         for (p = rom; p < rom + length; p++)
 297                 sum += *p;
 298         return sum == 0;
 299 }
 300
 301 static void __init probe_roms(void)
 302 {
 303         unsigned long start, length, upper;
 304         unsigned char *rom;
 305         int           i;
 306
 307         /* video rom */
 308         upper = adapter_rom_resources[0].start;
 309         for (start = video_rom_resource.start; start < upper; start += 2048) {
 310                 rom = isa_bus_to_virt(start);
 311                 if (!romsignature(rom))
 312                         continue;
 313
 314                 video_rom_resource.start = start;
 315
 316                 /* 0 < length <= 0x7f * 512, historically */
 317                 length = rom[2] * 512;
 318
 319                 /* if checksum okay, trust length byte */
 320                 if (length && romchecksum(rom, length))
 321                         video_rom_resource.end = start + length - 1;
 322
 323                 request_resource(&iomem_resource, &video_rom_resource);
 324                 break;
 325         }
 326
 327         start = (video_rom_resource.end + 1 + 2047) & ~2047UL;
 328         if (start < upper)
 329                 start = upper;
 330
 331         /* system rom */
 332         request_resource(&iomem_resource, &system_rom_resource);
 333         upper = system_rom_resource.start;
 334
 335         /* check for extension rom (ignore length byte!) */
 336         rom = isa_bus_to_virt(extension_rom_resource.start);
 337         if (romsignature(rom)) {
 338                 length = extension_rom_resource.end - extension_rom_resource.start + 1;
 339                 if (romchecksum(rom, length)) {
 340                         request_resource(&iomem_resource, &extension_rom_resource);
 341                         upper = extension_rom_resource.start;
 342                 }
 343         }
 344
 345         /* check for adapter roms on 2k boundaries */
 346         for (i = 0; i < ADAPTER_ROM_RESOURCES && start < upper; start += 2048) {
 347                 rom = isa_bus_to_virt(start);
 348                 if (!romsignature(rom))
 349                         continue;
 350
 351                 /* 0 < length <= 0x7f * 512, historically */
 352                 length = rom[2] * 512;
 353
 354                 /* but accept any length that fits if checksum okay */
 355                 if (!length || start + length > upper || !romchecksum(rom, length))
 356                         continue;
 357
 358                 adapter_rom_resources[i].start = start;
 359                 adapter_rom_resources[i].end = start + length - 1;
 360                 request_resource(&iomem_resource, &adapter_rom_resources[i]);
 361
 362                 start = adapter_rom_resources[i++].end & ~2047UL;
 363         }
 364 }
 365
 366 static void __init limit_regions(unsigned long long size)
 367 {
 368         unsigned long long current_addr = 0;
 369         int i;
 370
 371         if (efi_enabled) {
 372                 efi_memory_desc_t *md;
 373                 void *p;
 374
 375                 for (p = memmap.map, i = 0; p < memmap.map_end;
 376                         p += memmap.desc_size, i++) {
 377                         md = p;
 378                         current_addr = md->phys_addr + (md->num_pages << 12);
 379                         if (md->type == EFI_CONVENTIONAL_MEMORY) {
 380                                 if (current_addr >= size) {
 381                                         md->num_pages -=
 382                                                 (((current_addr-size) + PAGE_SIZE-1) >> PAGE_SHIFT);
 383                                         memmap.nr_map = i + 1;
 384                                         return;
 385                                 }
 386                         }
 387                 }
 388         }
 389         for (i = 0; i < e820.nr_map; i++) {
 390                 current_addr = e820.map[i].addr + e820.map[i].size;
 391                 if (current_addr < size)
 392                         continue;
 393
 394                 if (e820.map[i].type != E820_RAM)
 395                         continue;
 396
 397                 if (e820.map[i].addr >= size) {
 398                         /*
 399                          * This region starts past the end of the
 400                          * requested size, skip it completely.
 401                          */
 402                         e820.nr_map = i;
 403                 } else {
 404                         e820.nr_map = i + 1;
 405                         e820.map[i].size -= current_addr - size;
 406                 }
 407                 return;
 408         }
 409 }
 410
 411 static void __init add_memory_region(unsigned long long start,
 412                                   unsigned long long size, int type)
 413 {
 414         int x;
 415
 416         if (!efi_enabled) {
 417                 x = e820.nr_map;
 418
 419                 if (x == E820MAX) {
 420                     printk(KERN_ERR "Ooops! Too many entries in the memory map!\n");
 421                     return;
 422                 }
 423
 424                 e820.map[x].addr = start;
 425                 e820.map[x].size = size;
 426                 e820.map[x].type = type;
 427                 e820.nr_map++;
 428         }
 429 } /* add_memory_region */
 430
 431 #define E820_DEBUG      1
 432
 433 static void __init print_memory_map(char *who)
 434 {
 435         int i;
 436
 437         for (i = 0; i < e820.nr_map; i++) {
 438                 printk(" %s: %016Lx - %016Lx ", who,
 439                         e820.map[i].addr,
 440                         e820.map[i].addr + e820.map[i].size);
 441                 switch (e820.map[i].type) {
 442                 case E820_RAM:  printk("(usable)\n");
 443                                 break;
 444                 case E820_RESERVED:
 445                                 printk("(reserved)\n");
 446                                 break;
 447                 case E820_ACPI:
 448                                 printk("(ACPI data)\n");
 449                                 break;
 450                 case E820_NVS:
 451                                 printk("(ACPI NVS)\n");
 452                                 break;
 453                 default:        printk("type %lu\n", e820.map[i].type);
 454                                 break;
 455                 }
 456         }
 457 }
 458
 459 /*
 460  * Sanitize the BIOS e820 map.
 461  *
 462  * Some e820 responses include overlapping entries.  The following
 463  * replaces the original e820 map with a new one, removing overlaps.
 464  *
 465  */
 466 struct change_member {
 467         struct e820entry *pbios; /* pointer to original bios entry */
 468         unsigned long long addr; /* address for this change point */
 469 };
 470 static struct change_member change_point_list[2*E820MAX] __initdata;
 471 static struct change_member *change_point[2*E820MAX] __initdata;
 472 static struct e820entry *overlap_list[E820MAX] __initdata;
 473 static struct e820entry new_bios[E820MAX] __initdata;
 474
 475 static int __init sanitize_e820_map(struct e820entry * biosmap, char * pnr_map)
 476 {
 477         struct change_member *change_tmp;
 478         unsigned long current_type, last_type;
 479         unsigned long long last_addr;
 480         int chgidx, still_changing;
 481         int overlap_entries;
 482         int new_bios_entry;
 483         int old_nr, new_nr, chg_nr;
 484         int i;
 485
 486         /*
 487                 Visually we're performing the following (1,2,3,4 = memory types)...
 488
 489                 Sample memory map (w/overlaps):
 490                    ____22__________________
 491                    ______________________4_
 492                    ____1111________________
 493                    _44_____________________
 494                    11111111________________
 495                    ____________________33__
 496                    ___________44___________
 497                    __________33333_________
 498                    ______________22________
 499                    ___________________2222_
 500                    _________111111111______
 501                    _____________________11_
 502                    _________________4______
 503
 504                 Sanitized equivalent (no overlap):
 505                    1_______________________
 506                    _44_____________________
 507                    ___1____________________
 508                    ____22__________________
 509                    ______11________________
 510                    _________1______________
 511                    __________3_____________
 512                    ___________44___________
 513                    _____________33_________
 514                    _______________2________
 515                    ________________1_______
 516                    _________________4______
 517                    ___________________2____
 518                    ____________________33__
 519                    ______________________4_
 520         */
 521
 522         /* if there's only one memory region, don't bother */
 523         if (*pnr_map < 2)
 524                 return -1;
 525
 526         old_nr = *pnr_map;
 527
 528         /* bail out if we find any unreasonable addresses in bios map */
 529         for (i=0; i<old_nr; i++)
 530                 if (biosmap[i].addr + biosmap[i].size < biosmap[i].addr)
 531                         return -1;
 532
 533         /* create pointers for initial change-point information (for sorting) */
 534         for (i=0; i < 2*old_nr; i++)
 535                 change_point[i] = &change_point_list[i];
 536
 537         /* record all known change-points (starting and ending addresses),
 538            omitting those that are for empty memory regions */
 539         chgidx = 0;
 540         for (i=0; i < old_nr; i++)      {
 541                 if (biosmap[i].size != 0) {
 542                         change_point[chgidx]->addr = biosmap[i].addr;
 543                         change_point[chgidx++]->pbios = &biosmap[i];
 544                         change_point[chgidx]->addr = biosmap[i].addr + biosmap[i].size;
 545                         change_point[chgidx++]->pbios = &biosmap[i];
 546                 }
 547         }
 548         chg_nr = chgidx;        /* true number of change-points */
 549
 550         /* sort change-point list by memory addresses (low -> high) */
 551         still_changing = 1;
 552         while (still_changing)  {
 553                 still_changing = 0;
 554                 for (i=1; i < chg_nr; i++)  {
 555                         /* if <current_addr> > <last_addr>, swap */
 556                         /* or, if current=<start_addr> & last=<end_addr>, swap */
 557                         if ((change_point[i]->addr < change_point[i-1]->addr) ||
 558                                 ((change_point[i]->addr == change_point[i-1]->addr) &&
 559                                  (change_point[i]->addr == change_point[i]->pbios->addr) &&
 560                                  (change_point[i-1]->addr != change_point[i-1]->pbios->addr))
 561                            )
 562                         {
 563                                 change_tmp = change_point[i];
 564                                 change_point[i] = change_point[i-1];
 565                                 change_point[i-1] = change_tmp;
 566                                 still_changing=1;
 567                         }
 568                 }
 569         }
 570
 571         /* create a new bios memory map, removing overlaps */
 572         overlap_entries=0;       /* number of entries in the overlap table */
 573         new_bios_entry=0;        /* index for creating new bios map entries */
 574         last_type = 0;           /* start with undefined memory type */
 575         last_addr = 0;           /* start with 0 as last starting address */
 576         /* loop through change-points, determining affect on the new bios map */
 577         for (chgidx=0; chgidx < chg_nr; chgidx++)
 578         {
 579                 /* keep track of all overlapping bios entries */
 580                 if (change_point[chgidx]->addr == change_point[chgidx]->pbios->addr)
 581                 {
 582                         /* add map entry to overlap list (> 1 entry implies an overlap) */
 583                         overlap_list[overlap_entries++]=change_point[chgidx]->pbios;
 584                 }
 585                 else
 586                 {
 587                         /* remove entry from list (order independent, so swap with last) */
 588                         for (i=0; i<overlap_entries; i++)
 589                         {
 590                                 if (overlap_list[i] == change_point[chgidx]->pbios)
 591                                         overlap_list[i] = overlap_list[overlap_entries-1];
 592                         }
 593                         overlap_entries--;
 594                 }
 595                 /* if there are overlapping entries, decide which "type" to use */
 596                 /* (larger value takes precedence -- 1=usable, 2,3,4,4+=unusable) */
 597                 current_type = 0;
 598                 for (i=0; i<overlap_entries; i++)
 599                         if (overlap_list[i]->type > current_type)
 600                                 current_type = overlap_list[i]->type;
 601                 /* continue building up new bios map based on this information */
 602                 if (current_type != last_type)  {
 603                         if (last_type != 0)      {
 604                                 new_bios[new_bios_entry].size =
 605                                         change_point[chgidx]->addr - last_addr;
 606                                 /* move forward only if the new size was non-zero */
 607                                 if (new_bios[new_bios_entry].size != 0)
 608                                         if (++new_bios_entry >= E820MAX)
 609                                                 break;  /* no more space left for new bios entries */
 610                         }
 611                         if (current_type != 0)  {
 612                                 new_bios[new_bios_entry].addr = change_point[chgidx]->addr;
 613                                 new_bios[new_bios_entry].type = current_type;
 614                                 last_addr=change_point[chgidx]->addr;
 615                         }
 616                         last_type = current_type;
 617                 }
 618         }
 619         new_nr = new_bios_entry;   /* retain count for new bios entries */
 620
 621         /* copy new bios mapping into original location */
 622         memcpy(biosmap, new_bios, new_nr*sizeof(struct e820entry));
 623         *pnr_map = new_nr;
 624
 625         return 0;
 626 }
 627
 628 /*
 629  * Copy the BIOS e820 map into a safe place.
 630  *
 631  * Sanity-check it while we're at it..
 632  *
 633  * If we're lucky and live on a modern system, the setup code
 634  * will have given us a memory map that we can use to properly
 635  * set up memory.  If we aren't, we'll fake a memory map.
 636  *
 637  * We check to see that the memory map contains at least 2 elements
 638  * before we'll use it, because the detection code in setup.S may
 639  * not be perfect and most every PC known to man has two memory
 640  * regions: one from 0 to 640k, and one from 1mb up.  (The IBM
 641  * thinkpad 560x, for example, does not cooperate with the memory
 642  * detection code.)
 643  */
 644 static int __init copy_e820_map(struct e820entry * biosmap, int nr_map)
 645 {
 646         /* Only one memory region (or negative)? Ignore it */
 647         if (nr_map < 2)
 648                 return -1;
 649
 650         do {
 651                 unsigned long long start = biosmap->addr;
 652                 unsigned long long size = biosmap->size;
 653                 unsigned long long end = start + size;
 654                 unsigned long type = biosmap->type;
 655
 656                 /* Overflow in 64 bits? Ignore the memory map. */
 657                 if (start > end)
 658                         return -1;
 659
 660                 /*
 661                  * Some BIOSes claim RAM in the 640k - 1M region.
 662                  * Not right. Fix it up.
 663                  */
 664                 if (type == E820_RAM) {
 665                         if (start < 0x100000ULL && end > 0xA0000ULL) {
 666                                 if (start < 0xA0000ULL)
 667                                         add_memory_region(start, 0xA0000ULL-start, type);
 668                                 if (end <= 0x100000ULL)
 669                                         continue;
 670                                 start = 0x100000ULL;
 671                                 size = end - start;
 672                         }
 673                 }
 674                 add_memory_region(start, size, type);
 675         } while (biosmap++,--nr_map);
 676         return 0;
 677 }
 678
 679 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
 680 struct edd edd;
 681 #ifdef CONFIG_EDD_MODULE
 682 EXPORT_SYMBOL(edd);
 683 #endif
 684 /**
 685  * copy_edd() - Copy the BIOS EDD information
 686  *              from boot_params into a safe place.
 687  *
 688  */
 689 static inline void copy_edd(void)
 690 {
 691      memcpy(edd.mbr_signature, EDD_MBR_SIGNATURE, sizeof(edd.mbr_signature));
 692      memcpy(edd.edd_info, EDD_BUF, sizeof(edd.edd_info));
 693      edd.mbr_signature_nr = EDD_MBR_SIG_NR;
 694      edd.edd_info_nr = EDD_NR;
 695 }
 696 #else
 697 static inline void copy_edd(void)
 698 {
 699 }
 700 #endif
 701
 702 /*
 703  * Do NOT EVER look at the BIOS memory size location.
 704  * It does not work on many machines.
 705  */
 706 #define LOWMEMSIZE()    (0x9f000)
 707
 708 static void __init parse_cmdline_early (char ** cmdline_p)
 709 {
 710         char c = ' ', *to = command_line, *from = saved_command_line;
 711         int len = 0;
 712         int userdef = 0;
 713
 714         /* Save unparsed command line copy for /proc/cmdline */
 715         saved_command_line[COMMAND_LINE_SIZE-1] = '\0';
 716
 717         for (;;) {
 718                 if (c != ' ')
 719                         goto next_char;
 720                 /*
 721                  * "mem=nopentium" disables the 4MB page tables.
 722                  * "mem=XXX[kKmM]" defines a memory region from HIGH_MEM
 723                  * to <mem>, overriding the bios size.
 724                  * "memmap=XXX[KkmM]@XXX[KkmM]" defines a memory region from
 725                  * <start> to <start>+<mem>, overriding the bios size.
 726                  *
 727                  * HPA tells me bootloaders need to parse mem=, so no new
 728                  * option should be mem=  [also see Documentation/i386/boot.txt]
 729                  */
 730                 if (!memcmp(from, "mem=", 4)) {
 731                         if (to != command_line)
 732                                 to--;
 733                         if (!memcmp(from+4, "nopentium", 9)) {
 734                                 from += 9+4;
 735                                 clear_bit(X86_FEATURE_PSE, boot_cpu_data.x86_capability);
 736                                 disable_pse = 1;
 737                         } else {
 738                                 /* If the user specifies memory size, we
 739                                  * limit the BIOS-provided memory map to
 740                                  * that size. exactmap can be used to specify
 741                                  * the exact map. mem=number can be used to
 742                                  * trim the existing memory map.
 743                                  */
 744                                 unsigned long long mem_size;
 745
 746                                 mem_size = memparse(from+4, &from);
 747                                 limit_regions(mem_size);
 748                                 userdef=1;
 749                         }
 750                 }
 751
 752                 else if (!memcmp(from, "memmap=", 7)) {
 753                         if (to != command_line)
 754                                 to--;
 755                         if (!memcmp(from+7, "exactmap", 8)) {
 756 #ifdef CONFIG_CRASH_DUMP
 757                                 /* If we are doing a crash dump, we
 758                                  * still need to know the real mem
 759                                  * size before original memory map is
 760                                  * reset.
 761                                  */
 762                                 find_max_pfn();
 763                                 saved_max_pfn = max_pfn;
 764 #endif
 765                                 from += 8+7;
 766                                 e820.nr_map = 0;
 767                                 userdef = 1;
 768                         } else {
 769                                 /* If the user specifies memory size, we
 770                                  * limit the BIOS-provided memory map to
 771                                  * that size. exactmap can be used to specify
 772                                  * the exact map. mem=number can be used to
 773                                  * trim the existing memory map.
 774                                  */
 775                                 unsigned long long start_at, mem_size;
 776
 777                                 mem_size = memparse(from+7, &from);
 778                                 if (*from == '@') {
 779                                         start_at = memparse(from+1, &from);
 780                                         add_memory_region(start_at, mem_size, E820_RAM);
 781                                 } else if (*from == '#') {
 782                                         start_at = memparse(from+1, &from);
 783                                         add_memory_region(start_at, mem_size, E820_ACPI);
 784                                 } else if (*from == '$') {
 785                                         start_at = memparse(from+1, &from);
 786                                         add_memory_region(start_at, mem_size, E820_RESERVED);
 787                                 } else {
 788                                         limit_regions(mem_size);
 789                                         userdef=1;
 790                                 }
 791                         }
 792                 }
 793
 794                 else if (!memcmp(from, "noexec=", 7))
 795                         noexec_setup(from + 7);
 796
 797
 798 #ifdef  CONFIG_X86_SMP
 799                 /*
 800                  * If the BIOS enumerates physical processors before logical,
 801                  * maxcpus=N at enumeration-time can be used to disable HT.
 802                  */
 803                 else if (!memcmp(from, "maxcpus=", 8)) {
 804                         extern unsigned int maxcpus;
 805
 806                         maxcpus = simple_strtoul(from + 8, NULL, 0);
 807                 }
 808 #endif
 809
 810 #ifdef CONFIG_ACPI
 811                 /* "acpi=off" disables both ACPI table parsing and interpreter */
 812                 else if (!memcmp(from, "acpi=off", 8)) {
 813                         disable_acpi();
 814                 }
 815
 816                 /* acpi=force to over-ride black-list */
 817                 else if (!memcmp(from, "acpi=force", 10)) {
 818                         acpi_force = 1;
 819                         acpi_ht = 1;
 820                         acpi_disabled = 0;
 821                 }
 822
 823                 /* acpi=strict disables out-of-spec workarounds */
 824                 else if (!memcmp(from, "acpi=strict", 11)) {
 825                         acpi_strict = 1;
 826                 }
 827
 828                 /* Limit ACPI just to boot-time to enable HT */
 829                 else if (!memcmp(from, "acpi=ht", 7)) {
 830                         if (!acpi_force)
 831                                 disable_acpi();
 832                         acpi_ht = 1;
 833                 }
 834
 835                 /* "pci=noacpi" disable ACPI IRQ routing and PCI scan */
 836                 else if (!memcmp(from, "pci=noacpi", 10)) {
 837                         acpi_disable_pci();
 838                 }
 839                 /* "acpi=noirq" disables ACPI interrupt routing */
 840                 else if (!memcmp(from, "acpi=noirq", 10)) {
 841                         acpi_noirq_set();
 842                 }
 843
 844                 else if (!memcmp(from, "acpi_sci=edge", 13))
 845                         acpi_sci_flags.trigger =  1;
 846
 847                 else if (!memcmp(from, "acpi_sci=level", 14))
 848                         acpi_sci_flags.trigger = 3;
 849
 850                 else if (!memcmp(from, "acpi_sci=high", 13))
 851                         acpi_sci_flags.polarity = 1;
 852
 853                 else if (!memcmp(from, "acpi_sci=low", 12))
 854                         acpi_sci_flags.polarity = 3;
 855
 856 #ifdef CONFIG_X86_IO_APIC
 857                 else if (!memcmp(from, "acpi_skip_timer_override", 24))
 858                         acpi_skip_timer_override = 1;
 859
 860                 if (!memcmp(from, "disable_timer_pin_1", 19))
 861                         disable_timer_pin_1 = 1;
 862                 if (!memcmp(from, "enable_timer_pin_1", 18))
 863                         disable_timer_pin_1 = -1;
 864
 865                 /* disable IO-APIC */
 866                 else if (!memcmp(from, "noapic", 6))
 867                         disable_ioapic_setup();
 868 #endif /* CONFIG_X86_IO_APIC */
 869 #endif /* CONFIG_ACPI */
 870
 871 #ifdef CONFIG_X86_LOCAL_APIC
 872                 /* enable local APIC */
 873                 else if (!memcmp(from, "lapic", 5))
 874                         lapic_enable();
 875
 876                 /* disable local APIC */
 877                 else if (!memcmp(from, "nolapic", 6))
 878                         lapic_disable();
 879 #endif /* CONFIG_X86_LOCAL_APIC */
 880
 881 #ifdef CONFIG_KEXEC
 882                 /* crashkernel=size@addr specifies the location to reserve for
 883                  * a crash kernel.  By reserving this memory we guarantee
 884                  * that linux never set's it up as a DMA target.
 885                  * Useful for holding code to do something appropriate
 886                  * after a kernel panic.
 887                  */
 888                 else if (!memcmp(from, "crashkernel=", 12)) {
 889                         unsigned long size, base;
 890                         size = memparse(from+12, &from);
 891                         if (*from == '@') {
 892                                 base = memparse(from+1, &from);
 893                                 /* FIXME: Do I want a sanity check
 894                                  * to validate the memory range?
 895                                  */
 896                                 crashk_res.start = base;
 897                                 crashk_res.end   = base + size - 1;
 898                         }
 899                 }
 900 #endif
 901 #ifdef CONFIG_PROC_VMCORE
 902                 /* elfcorehdr= specifies the location of elf core header
 903                  * stored by the crashed kernel.
 904                  */
 905                 else if (!memcmp(from, "elfcorehdr=", 11))
 906                         elfcorehdr_addr = memparse(from+11, &from);
 907 #endif
 908
 909                 /*
 910                  * highmem=size forces highmem to be exactly 'size' bytes.
 911                  * This works even on boxes that have no highmem otherwise.
 912                  * This also works to reduce highmem size on bigger boxes.
 913                  */
 914                 else if (!memcmp(from, "highmem=", 8))
 915                         highmem_pages = memparse(from+8, &from) >> PAGE_SHIFT;
 916
 917                 /*
 918                  * vmalloc=size forces the vmalloc area to be exactly 'size'
 919                  * bytes. This can be used to increase (or decrease) the
 920                  * vmalloc area - the default is 128m.
 921                  */
 922                 else if (!memcmp(from, "vmalloc=", 8))
 923                         __VMALLOC_RESERVE = memparse(from+8, &from);
 924
 925         next_char:
 926                 c = *(from++);
 927                 if (!c)
 928                         break;
 929                 if (COMMAND_LINE_SIZE <= ++len)
 930                         break;
 931                 *(to++) = c;
 932         }
 933         *to = '\0';
 934         *cmdline_p = command_line;
 935         if (userdef) {
 936                 printk(KERN_INFO "user-defined physical RAM map:\n");
 937                 print_memory_map("user");
 938         }
 939 }
 940
 941 /*
 942  * Callback for efi_memory_walk.
 943  */
 944 static int __init
 945 efi_find_max_pfn(unsigned long start, unsigned long end, void *arg)
 946 {
 947         unsigned long *max_pfn = arg, pfn;
 948
 949         if (start < end) {
 950                 pfn = PFN_UP(end -1);
 951                 if (pfn > *max_pfn)
 952                         *max_pfn = pfn;
 953         }
 954         return 0;
 955 }
 956
 957 static int __init
 958 efi_memory_present_wrapper(unsigned long start, unsigned long end, void *arg)
 959 {
 960         memory_present(0, start, end);
 961         return 0;
 962 }
 963
 964 /*
 965  * Find the highest page frame number we have available
 966  */
 967 void __init find_max_pfn(void)
 968 {
 969         int i;
 970
 971         max_pfn = 0;
 972         if (efi_enabled) {
 973                 efi_memmap_walk(efi_find_max_pfn, &max_pfn);
 974                 efi_memmap_walk(efi_memory_present_wrapper, NULL);
 975                 return;
 976         }
 977
 978         for (i = 0; i < e820.nr_map; i++) {
 979                 unsigned long start, end;
 980                 /* RAM? */
 981                 if (e820.map[i].type != E820_RAM)
 982                         continue;
 983                 start = PFN_UP(e820.map[i].addr);
 984                 end = PFN_DOWN(e820.map[i].addr + e820.map[i].size);
 985                 if (start >= end)
 986                         continue;
 987                 if (end > max_pfn)
 988                         max_pfn = end;
 989                 memory_present(0, start, end);
 990         }
 991 }
 992
 993 /*
 994  * Determine low and high memory ranges:
 995  */
 996 unsigned long __init find_max_low_pfn(void)
 997 {
 998         unsigned long max_low_pfn;
 999
1000         max_low_pfn = max_pfn;
1001         if (max_low_pfn > MAXMEM_PFN) {
1002                 if (highmem_pages == -1)
1003                         highmem_pages = max_pfn - MAXMEM_PFN;
1004                 if (highmem_pages + MAXMEM_PFN < max_pfn)
1005                         max_pfn = MAXMEM_PFN + highmem_pages;
1006                 if (highmem_pages + MAXMEM_PFN > max_pfn) {
1007                         printk("only %luMB highmem pages available, ignoring highmem size of %uMB.\n", pages_to_mb(max_pfn - MAXMEM_PFN), pages_to_mb(highmem_pages));
1008                         highmem_pages = 0;
1009                 }
1010                 max_low_pfn = MAXMEM_PFN;
1011 #ifndef CONFIG_HIGHMEM
1012                 /* Maximum memory usable is what is directly addressable */
1013                 printk(KERN_WARNING "Warning only %ldMB will be used.\n",
1014                                         MAXMEM>>20);
1015                 if (max_pfn > MAX_NONPAE_PFN)
1016                         printk(KERN_WARNING "Use a PAE enabled kernel.\n");
1017                 else
1018                         printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
1019                 max_pfn = MAXMEM_PFN;
1020 #else /* !CONFIG_HIGHMEM */
1021 #ifndef CONFIG_X86_PAE
1022                 if (max_pfn > MAX_NONPAE_PFN) {
1023                         max_pfn = MAX_NONPAE_PFN;
1024                         printk(KERN_WARNING "Warning only 4GB will be used.\n");
1025                         printk(KERN_WARNING "Use a PAE enabled kernel.\n");
1026                 }
1027 #endif /* !CONFIG_X86_PAE */
1028 #endif /* !CONFIG_HIGHMEM */
1029         } else {
1030                 if (highmem_pages == -1)
1031                         highmem_pages = 0;
1032 #ifdef CONFIG_HIGHMEM
1033                 if (highmem_pages >= max_pfn) {
1034                         printk(KERN_ERR "highmem size specified (%uMB) is bigger than pages available (%luMB)!.\n", pages_to_mb(highmem_pages), pages_to_mb(max_pfn));
1035                         highmem_pages = 0;
1036                 }
1037                 if (highmem_pages) {
1038                         if (max_low_pfn-highmem_pages < 64*1024*1024/PAGE_SIZE){
1039                                 printk(KERN_ERR "highmem size %uMB results in smaller than 64MB lowmem, ignoring it.\n", pages_to_mb(highmem_pages));
1040                                 highmem_pages = 0;
1041                         }
1042                         max_low_pfn -= highmem_pages;
1043                 }
1044 #else
1045                 if (highmem_pages)
1046                         printk(KERN_ERR "ignoring highmem size on non-highmem kernel!\n");
1047 #endif
1048         }
1049         return max_low_pfn;
1050 }
1051
1052 /*
1053  * Free all available memory for boot time allocation.  Used
1054  * as a callback function by efi_memory_walk()
1055  */
1056
1057 static int __init
1058 free_available_memory(unsigned long start, unsigned long end, void *arg)
1059 {
1060         /* check max_low_pfn */
1061         if (start >= ((max_low_pfn + 1) << PAGE_SHIFT))
1062                 return 0;
1063         if (end >= ((max_low_pfn + 1) << PAGE_SHIFT))
1064                 end = (max_low_pfn + 1) << PAGE_SHIFT;
1065         if (start < end)
1066                 free_bootmem(start, end - start);
1067
1068         return 0;
1069 }
1070 /*
1071  * Register fully available low RAM pages with the bootmem allocator.
1072  */
1073 static void __init register_bootmem_low_pages(unsigned long max_low_pfn)
1074 {
1075         int i;
1076
1077         if (efi_enabled) {
1078                 efi_memmap_walk(free_available_memory, NULL);
1079                 return;
1080         }
1081         for (i = 0; i < e820.nr_map; i++) {
1082                 unsigned long curr_pfn, last_pfn, size;
1083                 /*
1084                  * Reserve usable low memory
1085                  */
1086                 if (e820.map[i].type != E820_RAM)
1087                         continue;
1088                 /*
1089                  * We are rounding up the start address of usable memory:
1090                  */
1091                 curr_pfn = PFN_UP(e820.map[i].addr);
1092                 if (curr_pfn >= max_low_pfn)
1093                         continue;
1094                 /*
1095                  * ... and at the end of the usable range downwards:
1096                  */
1097                 last_pfn = PFN_DOWN(e820.map[i].addr + e820.map[i].size);
1098
1099                 if (last_pfn > max_low_pfn)
1100                         last_pfn = max_low_pfn;
1101
1102                 /*
1103                  * .. finally, did all the rounding and playing
1104                  * around just make the area go away?
1105                  */
1106                 if (last_pfn <= curr_pfn)
1107                         continue;
1108
1109                 size = last_pfn - curr_pfn;
1110                 free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(size));
1111         }
1112 }
1113
1114 /*
1115  * workaround for Dell systems that neglect to reserve EBDA
1116  */
1117 static void __init reserve_ebda_region(void)
1118 {
1119         unsigned int addr;
1120         addr = get_bios_ebda();
1121         if (addr)
1122                 reserve_bootmem(addr, PAGE_SIZE);
1123 }
1124
1125 #ifndef CONFIG_NEED_MULTIPLE_NODES
1126 void __init setup_bootmem_allocator(void);
1127 static unsigned long __init setup_memory(void)
1128 {
1129         /*
1130          * partially used pages are not usable - thus
1131          * we are rounding upwards:
1132          */
1133         min_low_pfn = PFN_UP(init_pg_tables_end);
1134
1135         find_max_pfn();
1136
1137         max_low_pfn = find_max_low_pfn();
1138
1139 #ifdef CONFIG_HIGHMEM
1140         highstart_pfn = highend_pfn = max_pfn;
1141         if (max_pfn > max_low_pfn) {
1142                 highstart_pfn = max_low_pfn;
1143         }
1144         printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
1145                 pages_to_mb(highend_pfn - highstart_pfn));
1146 #endif
1147         printk(KERN_NOTICE "%ldMB LOWMEM available.\n",
1148                         pages_to_mb(max_low_pfn));
1149
1150         setup_bootmem_allocator();
1151
1152         return max_low_pfn;
1153 }
1154
1155 void __init zone_sizes_init(void)
1156 {
1157         unsigned long zones_size[MAX_NR_ZONES] = {0, 0, 0};
1158         unsigned int max_dma, low;
1159
1160         max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
1161         low = max_low_pfn;
1162
1163         if (low < max_dma)
1164                 zones_size[ZONE_DMA] = low;
1165         else {
1166                 zones_size[ZONE_DMA] = max_dma;
1167                 zones_size[ZONE_NORMAL] = low - max_dma;
1168 #ifdef CONFIG_HIGHMEM
1169                 zones_size[ZONE_HIGHMEM] = highend_pfn - low;
1170 #endif
1171         }
1172         free_area_init(zones_size);
1173 }
1174 #else
1175 extern unsigned long __init setup_memory(void);
1176 extern void zone_sizes_init(void);
1177 #endif /* !CONFIG_NEED_MULTIPLE_NODES */
1178
1179 void __init setup_bootmem_allocator(void)
1180 {
1181         unsigned long bootmap_size;
1182         /*
1183          * Initialize the boot-time allocator (with low memory only):
1184          */
1185         bootmap_size = init_bootmem(min_low_pfn, max_low_pfn);
1186
1187         register_bootmem_low_pages(max_low_pfn);
1188
1189         /*
1190          * Reserve the bootmem bitmap itself as well. We do this in two
1191          * steps (first step was init_bootmem()) because this catches
1192          * the (very unlikely) case of us accidentally initializing the
1193          * bootmem allocator with an invalid RAM area.
1194          */
1195         reserve_bootmem(__PHYSICAL_START, (PFN_PHYS(min_low_pfn) +
1196                          bootmap_size + PAGE_SIZE-1) - (__PHYSICAL_START));
1197
1198         /*
1199          * reserve physical page 0 - it's a special BIOS page on many boxes,
1200          * enabling clean reboots, SMP operation, laptop functions.
1201          */
1202         reserve_bootmem(0, PAGE_SIZE);
1203
1204         /* reserve EBDA region, it's a 4K region */
1205         reserve_ebda_region();
1206
1207     /* could be an AMD 768MPX chipset. Reserve a page  before VGA to prevent
1208        PCI prefetch into it (errata #56). Usually the page is reserved anyways,
1209        unless you have no PS/2 mouse plugged in. */
1210         if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
1211             boot_cpu_data.x86 == 6)
1212              reserve_bootmem(0xa0000 - 4096, 4096);
1213
1214 #ifdef CONFIG_SMP
1215         /*
1216          * But first pinch a few for the stack/trampoline stuff
1217          * FIXME: Don't need the extra page at 4K, but need to fix
1218          * trampoline before removing it. (see the GDT stuff)
1219          */
1220         reserve_bootmem(PAGE_SIZE, PAGE_SIZE);
1221 #endif
1222 #ifdef CONFIG_ACPI_SLEEP
1223         /*
1224          * Reserve low memory region for sleep support.
1225          */
1226         acpi_reserve_bootmem();
1227 #endif
1228 #ifdef CONFIG_X86_FIND_SMP_CONFIG
1229         /*
1230          * Find and reserve possible boot-time SMP configuration:
1231          */
1232         find_smp_config();
1233 #endif
1234
1235 #ifdef CONFIG_BLK_DEV_INITRD
1236         if (LOADER_TYPE && INITRD_START) {
1237                 if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
1238                         reserve_bootmem(INITRD_START, INITRD_SIZE);
1239                         initrd_start =
1240                                 INITRD_START ? INITRD_START + PAGE_OFFSET : 0;
1241                         initrd_end = initrd_start+INITRD_SIZE;
1242                 }
1243                 else {
1244                         printk(KERN_ERR "initrd extends beyond end of memory "
1245                             "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
1246                             INITRD_START + INITRD_SIZE,
1247                             max_low_pfn << PAGE_SHIFT);
1248                         initrd_start = 0;
1249                 }
1250         }
1251 #endif
1252 #ifdef CONFIG_KEXEC
1253         if (crashk_res.start != crashk_res.end)
1254                 reserve_bootmem(crashk_res.start,
1255                         crashk_res.end - crashk_res.start + 1);
1256 #endif
1257 }
1258
1259 /*
1260  * The node 0 pgdat is initialized before all of these because
1261  * it's needed for bootmem.  node>0 pgdats have their virtual
1262  * space allocated before the pagetables are in place to access
1263  * them, so they can't be cleared then.
1264  *
1265  * This should all compile down to nothing when NUMA is off.
1266  */
1267 void __init remapped_pgdat_init(void)
1268 {
1269         int nid;
1270
1271         for_each_online_node(nid) {
1272                 if (nid != 0)
1273                         memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
1274         }
1275 }
1276
1277 /*
1278  * Request address space for all standard RAM and ROM resources
1279  * and also for regions reported as reserved by the e820.
1280  */
1281 static void __init
1282 legacy_init_iomem_resources(struct resource *code_resource, struct resource *data_resource)
1283 {
1284         int i;
1285
1286         probe_roms();
1287         for (i = 0; i < e820.nr_map; i++) {
1288                 struct resource *res;
1289                 if (e820.map[i].addr + e820.map[i].size > 0x100000000ULL)
1290                         continue;
1291                 res = alloc_bootmem_low(sizeof(struct resource));
1292                 switch (e820.map[i].type) {
1293                 case E820_RAM:  res->name = "System RAM"; break;
1294                 case E820_ACPI: res->name = "ACPI Tables"; break;
1295                 case E820_NVS:  res->name = "ACPI Non-volatile Storage"; break;
1296                 default:        res->name = "reserved";
1297                 }
1298                 res->start = e820.map[i].addr;
1299                 res->end = res->start + e820.map[i].size - 1;
1300                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
1301                 request_resource(&iomem_resource, res);
1302                 if (e820.map[i].type == E820_RAM) {
1303                         /*
1304                          *  We don't know which RAM region contains kernel data,
1305                          *  so we try it repeatedly and let the resource manager
1306                          *  test it.
1307                          */
1308                         request_resource(res, code_resource);
1309                         request_resource(res, data_resource);
1310 #ifdef CONFIG_KEXEC
1311                         request_resource(res, &crashk_res);
1312 #endif
1313                 }
1314         }
1315 }
1316
1317 /*
1318  * Request address space for all standard resources
1319  */
1320 static void __init register_memory(void)
1321 {
1322         unsigned long gapstart, gapsize, round;
1323         unsigned long long last;
1324         int           i;
1325
1326         if (efi_enabled)
1327                 efi_initialize_iomem_resources(&code_resource, &data_resource);
1328         else
1329                 legacy_init_iomem_resources(&code_resource, &data_resource);
1330
1331         /* EFI systems may still have VGA */
1332         request_resource(&iomem_resource, &video_ram_resource);
1333
1334         /* request I/O space for devices used on all i[345]86 PCs */
1335         for (i = 0; i < STANDARD_IO_RESOURCES; i++)
1336                 request_resource(&ioport_resource, &standard_io_resources[i]);
1337
1338         /*
1339          * Search for the bigest gap in the low 32 bits of the e820
1340          * memory space.
1341          */
1342         last = 0x100000000ull;
1343         gapstart = 0x10000000;
1344         gapsize = 0x400000;
1345         i = e820.nr_map;
1346         while (--i >= 0) {
1347                 unsigned long long start = e820.map[i].addr;
1348                 unsigned long long end = start + e820.map[i].size;
1349
1350                 /*
1351                  * Since "last" is at most 4GB, we know we'll
1352                  * fit in 32 bits if this condition is true
1353                  */
1354                 if (last > end) {
1355                         unsigned long gap = last - end;
1356
1357                         if (gap > gapsize) {
1358                                 gapsize = gap;
1359                                 gapstart = end;
1360                         }
1361                 }
1362                 if (start < last)
1363                         last = start;
1364         }
1365
1366         /*
1367          * See how much we want to round up: start off with
1368          * rounding to the next 1MB area.
1369          */
1370         round = 0x100000;
1371         while ((gapsize >> 4) > round)
1372                 round += round;
1373         /* Fun with two's complement */
1374         pci_mem_start = (gapstart + round) & -round;
1375
1376         printk("Allocating PCI resources starting at %08lx (gap: %08lx:%08lx)\n",
1377                 pci_mem_start, gapstart, gapsize);
1378 }
1379
1380 static char * __init machine_specific_memory_setup(void);
1381
1382 #ifdef CONFIG_MCA
1383 static void set_mca_bus(int x)
1384 {
1385         MCA_bus = x;
1386 }
1387 #else
1388 static void set_mca_bus(int x) { }
1389 #endif
1390
1391 /*
1392  * Determine if we were loaded by an EFI loader.  If so, then we have also been
1393  * passed the efi memmap, systab, etc., so we should use these data structures
1394  * for initialization.  Note, the efi init code path is determined by the
1395  * global efi_enabled. This allows the same kernel image to be used on existing
1396  * systems (with a traditional BIOS) as well as on EFI systems.
1397  */
1398 void __init setup_arch(char **cmdline_p)
1399 {
1400         unsigned long max_low_pfn;
1401
1402         memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
1403         pre_setup_arch_hook();
1404         early_cpu_init();
1405
1406         /*
1407          * FIXME: This isn't an official loader_type right
1408          * now but does currently work with elilo.
1409          * If we were configured as an EFI kernel, check to make
1410          * sure that we were loaded correctly from elilo and that
1411          * the system table is valid.  If not, then initialize normally.
1412          */
1413 #ifdef CONFIG_EFI
1414         if ((LOADER_TYPE == 0x50) && EFI_SYSTAB)
1415                 efi_enabled = 1;
1416 #endif
1417
1418         ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
1419         drive_info = DRIVE_INFO;
1420         screen_info = SCREEN_INFO;
1421         edid_info = EDID_INFO;
1422         apm_info.bios = APM_BIOS_INFO;
1423         ist_info = IST_INFO;
1424         saved_videomode = VIDEO_MODE;
1425         if( SYS_DESC_TABLE.length != 0 ) {
1426                 set_mca_bus(SYS_DESC_TABLE.table[3] & 0x2);
1427                 machine_id = SYS_DESC_TABLE.table[0];
1428                 machine_submodel_id = SYS_DESC_TABLE.table[1];
1429                 BIOS_revision = SYS_DESC_TABLE.table[2];
1430         }
1431         bootloader_type = LOADER_TYPE;
1432
1433 #ifdef CONFIG_BLK_DEV_RAM
1434         rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
1435         rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
1436         rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
1437 #endif
1438         ARCH_SETUP
1439         if (efi_enabled)
1440                 efi_init();
1441         else {
1442                 printk(KERN_INFO "BIOS-provided physical RAM map:\n");
1443                 print_memory_map(machine_specific_memory_setup());
1444         }
1445
1446         copy_edd();
1447
1448         if (!MOUNT_ROOT_RDONLY)
1449                 root_mountflags &= ~MS_RDONLY;
1450         init_mm.start_code = (unsigned long) _text;
1451         init_mm.end_code = (unsigned long) _etext;
1452         init_mm.end_data = (unsigned long) _edata;
1453         init_mm.brk = init_pg_tables_end + PAGE_OFFSET;
1454
1455         code_resource.start = virt_to_phys(_text);
1456         code_resource.end = virt_to_phys(_etext)-1;
1457         data_resource.start = virt_to_phys(_etext);
1458         data_resource.end = virt_to_phys(_edata)-1;
1459
1460         parse_cmdline_early(cmdline_p);
1461
1462         max_low_pfn = setup_memory();
1463
1464         /*
1465          * NOTE: before this point _nobody_ is allowed to allocate
1466          * any memory using the bootmem allocator.  Although the
1467          * alloctor is now initialised only the first 8Mb of the kernel
1468          * virtual address space has been mapped.  All allocations before
1469          * paging_init() has completed must use the alloc_bootmem_low_pages()
1470          * variant (which allocates DMA'able memory) and care must be taken
1471          * not to exceed the 8Mb limit.
1472          */
1473
1474 #ifdef CONFIG_SMP
1475         smp_alloc_memory(); /* AP processor realmode stacks in low memory*/
1476 #endif
1477         paging_init();
1478         remapped_pgdat_init();
1479         sparse_init();
1480         zone_sizes_init();
1481
1482         /*
1483          * NOTE: at this point the bootmem allocator is fully available.
1484          */
1485
1486 #ifdef CONFIG_EARLY_PRINTK
1487         {
1488                 char *s = strstr(*cmdline_p, "earlyprintk=");
1489                 if (s) {
1490                         extern void setup_early_printk(char *);
1491
1492                         setup_early_printk(strchr(s, '=') + 1);
1493                         printk("early console enabled\n");
1494                 }
1495         }
1496 #endif
1497
1498
1499         dmi_scan_machine();
1500
1501 #ifdef CONFIG_X86_GENERICARCH
1502         generic_apic_probe(*cmdline_p);
1503 #endif
1504         if (efi_enabled)
1505                 efi_map_memmap();
1506
1507 #ifdef CONFIG_X86_IO_APIC
1508         check_acpi_pci();       /* Checks more than just ACPI actually */
1509 #endif
1510
1511 #ifdef CONFIG_ACPI
1512         /*
1513          * Parse the ACPI tables for possible boot-time SMP configuration.
1514          */
1515         acpi_boot_table_init();
1516         acpi_boot_init();
1517
1518 #if defined(CONFIG_SMP) && defined(CONFIG_X86_PC)
1519         if (def_to_bigsmp)
1520                 printk(KERN_WARNING "More than 8 CPUs detected and "
1521                         "CONFIG_X86_PC cannot handle it.\nUse "
1522                         "CONFIG_X86_GENERICARCH or CONFIG_X86_BIGSMP.\n");
1523 #endif
1524 #endif
1525 #ifdef CONFIG_X86_LOCAL_APIC
1526         if (smp_found_config)
1527                 get_smp_config();
1528 #endif
1529
1530         register_memory();
1531
1532 #ifdef CONFIG_VT
1533 #if defined(CONFIG_VGA_CONSOLE)
1534         if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
1535                 conswitchp = &vga_con;
1536 #elif defined(CONFIG_DUMMY_CONSOLE)
1537         conswitchp = &dummy_con;
1538 #endif
1539 #endif
1540 }
1541
1542 #include "setup_arch_post.h"
1543 /*
1544  * Local Variables:
1545  * mode:c
1546  * c-file-style:"k&r"
1547  * c-basic-offset:8
1548  * End:
1549  */