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
  49 #include <video/edid.h>
  50
  51 #include <asm/apic.h>
  52 #include <asm/e820.h>
  53 #include <asm/mpspec.h>
  54 #include <asm/setup.h>
  55 #include <asm/arch_hooks.h>
  56 #include <asm/sections.h>
  57 #include <asm/io_apic.h>
  58 #include <asm/ist.h>
  59 #include <asm/io.h>
  60 #include "setup_arch_pre.h"
  61 #include <bios_ebda.h>
  62
  63 /* Forward Declaration. */
  64 void __init find_max_pfn(void);
  65
  66 /* This value is set up by the early boot code to point to the value
  67    immediately after the boot time page tables.  It contains a *physical*
  68    address, and must not be in the .bss segment! */
  69 unsigned long init_pg_tables_end __initdata = ~0UL;
  70
  71 int disable_pse __devinitdata = 0;
  72
  73 /*
  74  * Machine setup..
  75  */
  76
  77 #ifdef CONFIG_EFI
  78 int efi_enabled = 0;
  79 EXPORT_SYMBOL(efi_enabled);
  80 #endif
  81
  82 /* cpu data as detected by the assembly code in head.S */
  83 struct cpuinfo_x86 new_cpu_data __initdata = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
  84 /* common cpu data for all cpus */
  85 struct cpuinfo_x86 boot_cpu_data __read_mostly = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
  86 EXPORT_SYMBOL(boot_cpu_data);
  87
  88 unsigned long mmu_cr4_features;
  89
  90 #ifdef  CONFIG_ACPI
  91         int acpi_disabled = 0;
  92 #else
  93         int acpi_disabled = 1;
  94 #endif
  95 EXPORT_SYMBOL(acpi_disabled);
  96
  97 #ifdef  CONFIG_ACPI
  98 int __initdata acpi_force = 0;
  99 extern acpi_interrupt_flags     acpi_sci_flags;
 100 #endif
 101
 102 /* for MCA, but anyone else can use it if they want */
 103 unsigned int machine_id;
 104 #ifdef CONFIG_MCA
 105 EXPORT_SYMBOL(machine_id);
 106 #endif
 107 unsigned int machine_submodel_id;
 108 unsigned int BIOS_revision;
 109 unsigned int mca_pentium_flag;
 110
 111 /* For PCI or other memory-mapped resources */
 112 unsigned long pci_mem_start = 0x10000000;
 113 #ifdef CONFIG_PCI
 114 EXPORT_SYMBOL(pci_mem_start);
 115 #endif
 116
 117 /* Boot loader ID as an integer, for the benefit of proc_dointvec */
 118 int bootloader_type;
 119
 120 /* user-defined highmem size */
 121 static unsigned int highmem_pages = -1;
 122
 123 /*
 124  * Setup options
 125  */
 126 struct drive_info_struct { char dummy[32]; } drive_info;
 127 #if defined(CONFIG_BLK_DEV_IDE) || defined(CONFIG_BLK_DEV_HD) || \
 128     defined(CONFIG_BLK_DEV_IDE_MODULE) || defined(CONFIG_BLK_DEV_HD_MODULE)
 129 EXPORT_SYMBOL(drive_info);
 130 #endif
 131 struct screen_info screen_info;
 132 #ifdef CONFIG_VT
 133 EXPORT_SYMBOL(screen_info);
 134 #endif
 135 struct apm_info apm_info;
 136 EXPORT_SYMBOL(apm_info);
 137 struct sys_desc_table_struct {
 138         unsigned short length;
 139         unsigned char table[0];
 140 };
 141 struct edid_info edid_info;
 142 EXPORT_SYMBOL_GPL(edid_info);
 143 struct ist_info ist_info;
 144 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
 145         defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
 146 EXPORT_SYMBOL(ist_info);
 147 #endif
 148 struct e820map e820;
 149
 150 extern void early_cpu_init(void);
 151 extern void dmi_scan_machine(void);
 152 extern void generic_apic_probe(char *);
 153 extern int root_mountflags;
 154
 155 unsigned long saved_videomode;
 156
 157 #define RAMDISK_IMAGE_START_MASK        0x07FF
 158 #define RAMDISK_PROMPT_FLAG             0x8000
 159 #define RAMDISK_LOAD_FLAG               0x4000
 160
 161 static char command_line[COMMAND_LINE_SIZE];
 162
 163 unsigned char __initdata boot_params[PARAM_SIZE];
 164
 165 static struct resource data_resource = {
 166         .name   = "Kernel data",
 167         .start  = 0,
 168         .end    = 0,
 169         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 170 };
 171
 172 static struct resource code_resource = {
 173         .name   = "Kernel code",
 174         .start  = 0,
 175         .end    = 0,
 176         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 177 };
 178
 179 static struct resource system_rom_resource = {
 180         .name   = "System ROM",
 181         .start  = 0xf0000,
 182         .end    = 0xfffff,
 183         .flags  = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
 184 };
 185
 186 static struct resource extension_rom_resource = {
 187         .name   = "Extension ROM",
 188         .start  = 0xe0000,
 189         .end    = 0xeffff,
 190         .flags  = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
 191 };
 192
 193 static struct resource adapter_rom_resources[] = { {
 194         .name   = "Adapter ROM",
 195         .start  = 0xc8000,
 196         .end    = 0,
 197         .flags  = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
 198 }, {
 199         .name   = "Adapter ROM",
 200         .start  = 0,
 201         .end    = 0,
 202         .flags  = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
 203 }, {
 204         .name   = "Adapter ROM",
 205         .start  = 0,
 206         .end    = 0,
 207         .flags  = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
 208 }, {
 209         .name   = "Adapter ROM",
 210         .start  = 0,
 211         .end    = 0,
 212         .flags  = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
 213 }, {
 214         .name   = "Adapter ROM",
 215         .start  = 0,
 216         .end    = 0,
 217         .flags  = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
 218 }, {
 219         .name   = "Adapter ROM",
 220         .start  = 0,
 221         .end    = 0,
 222         .flags  = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
 223 } };
 224
 225 #define ADAPTER_ROM_RESOURCES \
 226         (sizeof adapter_rom_resources / sizeof adapter_rom_resources[0])
 227
 228 static struct resource video_rom_resource = {
 229         .name   = "Video ROM",
 230         .start  = 0xc0000,
 231         .end    = 0xc7fff,
 232         .flags  = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
 233 };
 234
 235 static struct resource video_ram_resource = {
 236         .name   = "Video RAM area",
 237         .start  = 0xa0000,
 238         .end    = 0xbffff,
 239         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 240 };
 241
 242 static struct resource standard_io_resources[] = { {
 243         .name   = "dma1",
 244         .start  = 0x0000,
 245         .end    = 0x001f,
 246         .flags  = IORESOURCE_BUSY | IORESOURCE_IO
 247 }, {
 248         .name   = "pic1",
 249         .start  = 0x0020,
 250         .end    = 0x0021,
 251         .flags  = IORESOURCE_BUSY | IORESOURCE_IO
 252 }, {
 253         .name   = "timer0",
 254         .start  = 0x0040,
 255         .end    = 0x0043,
 256         .flags  = IORESOURCE_BUSY | IORESOURCE_IO
 257 }, {
 258         .name   = "timer1",
 259         .start  = 0x0050,
 260         .end    = 0x0053,
 261         .flags  = IORESOURCE_BUSY | IORESOURCE_IO
 262 }, {
 263         .name   = "keyboard",
 264         .start  = 0x0060,
 265         .end    = 0x006f,
 266         .flags  = IORESOURCE_BUSY | IORESOURCE_IO
 267 }, {
 268         .name   = "dma page reg",
 269         .start  = 0x0080,
 270         .end    = 0x008f,
 271         .flags  = IORESOURCE_BUSY | IORESOURCE_IO
 272 }, {
 273         .name   = "pic2",
 274         .start  = 0x00a0,
 275         .end    = 0x00a1,
 276         .flags  = IORESOURCE_BUSY | IORESOURCE_IO
 277 }, {
 278         .name   = "dma2",
 279         .start  = 0x00c0,
 280         .end    = 0x00df,
 281         .flags  = IORESOURCE_BUSY | IORESOURCE_IO
 282 }, {
 283         .name   = "fpu",
 284         .start  = 0x00f0,
 285         .end    = 0x00ff,
 286         .flags  = IORESOURCE_BUSY | IORESOURCE_IO
 287 } };
 288
 289 #define STANDARD_IO_RESOURCES \
 290         (sizeof standard_io_resources / sizeof standard_io_resources[0])
 291
 292 #define romsignature(x) (*(unsigned short *)(x) == 0xaa55)
 293
 294 static int __init romchecksum(unsigned char *rom, unsigned long length)
 295 {
 296         unsigned char *p, sum = 0;
 297
 298         for (p = rom; p < rom + length; p++)
 299                 sum += *p;
 300         return sum == 0;
 301 }
 302
 303 static void __init probe_roms(void)
 304 {
 305         unsigned long start, length, upper;
 306         unsigned char *rom;
 307         int           i;
 308
 309         /* video rom */
 310         upper = adapter_rom_resources[0].start;
 311         for (start = video_rom_resource.start; start < upper; start += 2048) {
 312                 rom = isa_bus_to_virt(start);
 313                 if (!romsignature(rom))
 314                         continue;
 315
 316                 video_rom_resource.start = start;
 317
 318                 /* 0 < length <= 0x7f * 512, historically */
 319                 length = rom[2] * 512;
 320
 321                 /* if checksum okay, trust length byte */
 322                 if (length && romchecksum(rom, length))
 323                         video_rom_resource.end = start + length - 1;
 324
 325                 request_resource(&iomem_resource, &video_rom_resource);
 326                 break;
 327         }
 328
 329         start = (video_rom_resource.end + 1 + 2047) & ~2047UL;
 330         if (start < upper)
 331                 start = upper;
 332
 333         /* system rom */
 334         request_resource(&iomem_resource, &system_rom_resource);
 335         upper = system_rom_resource.start;
 336
 337         /* check for extension rom (ignore length byte!) */
 338         rom = isa_bus_to_virt(extension_rom_resource.start);
 339         if (romsignature(rom)) {
 340                 length = extension_rom_resource.end - extension_rom_resource.start + 1;
 341                 if (romchecksum(rom, length)) {
 342                         request_resource(&iomem_resource, &extension_rom_resource);
 343                         upper = extension_rom_resource.start;
 344                 }
 345         }
 346
 347         /* check for adapter roms on 2k boundaries */
 348         for (i = 0; i < ADAPTER_ROM_RESOURCES && start < upper; start += 2048) {
 349                 rom = isa_bus_to_virt(start);
 350                 if (!romsignature(rom))
 351                         continue;
 352
 353                 /* 0 < length <= 0x7f * 512, historically */
 354                 length = rom[2] * 512;
 355
 356                 /* but accept any length that fits if checksum okay */
 357                 if (!length || start + length > upper || !romchecksum(rom, length))
 358                         continue;
 359
 360                 adapter_rom_resources[i].start = start;
 361                 adapter_rom_resources[i].end = start + length - 1;
 362                 request_resource(&iomem_resource, &adapter_rom_resources[i]);
 363
 364                 start = adapter_rom_resources[i++].end & ~2047UL;
 365         }
 366 }
 367
 368 static void __init limit_regions(unsigned long long size)
 369 {
 370         unsigned long long current_addr = 0;
 371         int i;
 372
 373         if (efi_enabled) {
 374                 efi_memory_desc_t *md;
 375                 void *p;
 376
 377                 for (p = memmap.map, i = 0; p < memmap.map_end;
 378                         p += memmap.desc_size, i++) {
 379                         md = p;
 380                         current_addr = md->phys_addr + (md->num_pages << 12);
 381                         if (md->type == EFI_CONVENTIONAL_MEMORY) {
 382                                 if (current_addr >= size) {
 383                                         md->num_pages -=
 384                                                 (((current_addr-size) + PAGE_SIZE-1) >> PAGE_SHIFT);
 385                                         memmap.nr_map = i + 1;
 386                                         return;
 387                                 }
 388                         }
 389                 }
 390         }
 391         for (i = 0; i < e820.nr_map; i++) {
 392                 if (e820.map[i].type == E820_RAM) {
 393                         current_addr = e820.map[i].addr + e820.map[i].size;
 394                         if (current_addr >= size) {
 395                                 e820.map[i].size -= current_addr-size;
 396                                 e820.nr_map = i + 1;
 397                                 return;
 398                         }
 399                 }
 400         }
 401 }
 402
 403 static void __init add_memory_region(unsigned long long start,
 404                                   unsigned long long size, int type)
 405 {
 406         int x;
 407
 408         if (!efi_enabled) {
 409                 x = e820.nr_map;
 410
 411                 if (x == E820MAX) {
 412                     printk(KERN_ERR "Ooops! Too many entries in the memory map!\n");
 413                     return;
 414                 }
 415
 416                 e820.map[x].addr = start;
 417                 e820.map[x].size = size;
 418                 e820.map[x].type = type;
 419                 e820.nr_map++;
 420         }
 421 } /* add_memory_region */
 422
 423 #define E820_DEBUG      1
 424
 425 static void __init print_memory_map(char *who)
 426 {
 427         int i;
 428
 429         for (i = 0; i < e820.nr_map; i++) {
 430                 printk(" %s: %016Lx - %016Lx ", who,
 431                         e820.map[i].addr,
 432                         e820.map[i].addr + e820.map[i].size);
 433                 switch (e820.map[i].type) {
 434                 case E820_RAM:  printk("(usable)\n");
 435                                 break;
 436                 case E820_RESERVED:
 437                                 printk("(reserved)\n");
 438                                 break;
 439                 case E820_ACPI:
 440                                 printk("(ACPI data)\n");
 441                                 break;
 442                 case E820_NVS:
 443                                 printk("(ACPI NVS)\n");
 444                                 break;
 445                 default:        printk("type %lu\n", e820.map[i].type);
 446                                 break;
 447                 }
 448         }
 449 }
 450
 451 /*
 452  * Sanitize the BIOS e820 map.
 453  *
 454  * Some e820 responses include overlapping entries.  The following
 455  * replaces the original e820 map with a new one, removing overlaps.
 456  *
 457  */
 458 struct change_member {
 459         struct e820entry *pbios; /* pointer to original bios entry */
 460         unsigned long long addr; /* address for this change point */
 461 };
 462 static struct change_member change_point_list[2*E820MAX] __initdata;
 463 static struct change_member *change_point[2*E820MAX] __initdata;
 464 static struct e820entry *overlap_list[E820MAX] __initdata;
 465 static struct e820entry new_bios[E820MAX] __initdata;
 466
 467 static int __init sanitize_e820_map(struct e820entry * biosmap, char * pnr_map)
 468 {
 469         struct change_member *change_tmp;
 470         unsigned long current_type, last_type;
 471         unsigned long long last_addr;
 472         int chgidx, still_changing;
 473         int overlap_entries;
 474         int new_bios_entry;
 475         int old_nr, new_nr, chg_nr;
 476         int i;
 477
 478         /*
 479                 Visually we're performing the following (1,2,3,4 = memory types)...
 480
 481                 Sample memory map (w/overlaps):
 482                    ____22__________________
 483                    ______________________4_
 484                    ____1111________________
 485                    _44_____________________
 486                    11111111________________
 487                    ____________________33__
 488                    ___________44___________
 489                    __________33333_________
 490                    ______________22________
 491                    ___________________2222_
 492                    _________111111111______
 493                    _____________________11_
 494                    _________________4______
 495
 496                 Sanitized equivalent (no overlap):
 497                    1_______________________
 498                    _44_____________________
 499                    ___1____________________
 500                    ____22__________________
 501                    ______11________________
 502                    _________1______________
 503                    __________3_____________
 504                    ___________44___________
 505                    _____________33_________
 506                    _______________2________
 507                    ________________1_______
 508                    _________________4______
 509                    ___________________2____
 510                    ____________________33__
 511                    ______________________4_
 512         */
 513
 514         /* if there's only one memory region, don't bother */
 515         if (*pnr_map < 2)
 516                 return -1;
 517
 518         old_nr = *pnr_map;
 519
 520         /* bail out if we find any unreasonable addresses in bios map */
 521         for (i=0; i<old_nr; i++)
 522                 if (biosmap[i].addr + biosmap[i].size < biosmap[i].addr)
 523                         return -1;
 524
 525         /* create pointers for initial change-point information (for sorting) */
 526         for (i=0; i < 2*old_nr; i++)
 527                 change_point[i] = &change_point_list[i];
 528
 529         /* record all known change-points (starting and ending addresses),
 530            omitting those that are for empty memory regions */
 531         chgidx = 0;
 532         for (i=0; i < old_nr; i++)      {
 533                 if (biosmap[i].size != 0) {
 534                         change_point[chgidx]->addr = biosmap[i].addr;
 535                         change_point[chgidx++]->pbios = &biosmap[i];
 536                         change_point[chgidx]->addr = biosmap[i].addr + biosmap[i].size;
 537                         change_point[chgidx++]->pbios = &biosmap[i];
 538                 }
 539         }
 540         chg_nr = chgidx;        /* true number of change-points */
 541
 542         /* sort change-point list by memory addresses (low -> high) */
 543         still_changing = 1;
 544         while (still_changing)  {
 545                 still_changing = 0;
 546                 for (i=1; i < chg_nr; i++)  {
 547                         /* if <current_addr> > <last_addr>, swap */
 548                         /* or, if current=<start_addr> & last=<end_addr>, swap */
 549                         if ((change_point[i]->addr < change_point[i-1]->addr) ||
 550                                 ((change_point[i]->addr == change_point[i-1]->addr) &&
 551                                  (change_point[i]->addr == change_point[i]->pbios->addr) &&
 552                                  (change_point[i-1]->addr != change_point[i-1]->pbios->addr))
 553                            )
 554                         {
 555                                 change_tmp = change_point[i];
 556                                 change_point[i] = change_point[i-1];
 557                                 change_point[i-1] = change_tmp;
 558                                 still_changing=1;
 559                         }
 560                 }
 561         }
 562
 563         /* create a new bios memory map, removing overlaps */
 564         overlap_entries=0;       /* number of entries in the overlap table */
 565         new_bios_entry=0;        /* index for creating new bios map entries */
 566         last_type = 0;           /* start with undefined memory type */
 567         last_addr = 0;           /* start with 0 as last starting address */
 568         /* loop through change-points, determining affect on the new bios map */
 569         for (chgidx=0; chgidx < chg_nr; chgidx++)
 570         {
 571                 /* keep track of all overlapping bios entries */
 572                 if (change_point[chgidx]->addr == change_point[chgidx]->pbios->addr)
 573                 {
 574                         /* add map entry to overlap list (> 1 entry implies an overlap) */
 575                         overlap_list[overlap_entries++]=change_point[chgidx]->pbios;
 576                 }
 577                 else
 578                 {
 579                         /* remove entry from list (order independent, so swap with last) */
 580                         for (i=0; i<overlap_entries; i++)
 581                         {
 582                                 if (overlap_list[i] == change_point[chgidx]->pbios)
 583                                         overlap_list[i] = overlap_list[overlap_entries-1];
 584                         }
 585                         overlap_entries--;
 586                 }
 587                 /* if there are overlapping entries, decide which "type" to use */
 588                 /* (larger value takes precedence -- 1=usable, 2,3,4,4+=unusable) */
 589                 current_type = 0;
 590                 for (i=0; i<overlap_entries; i++)
 591                         if (overlap_list[i]->type > current_type)
 592                                 current_type = overlap_list[i]->type;
 593                 /* continue building up new bios map based on this information */
 594                 if (current_type != last_type)  {
 595                         if (last_type != 0)      {
 596                                 new_bios[new_bios_entry].size =
 597                                         change_point[chgidx]->addr - last_addr;
 598                                 /* move forward only if the new size was non-zero */
 599                                 if (new_bios[new_bios_entry].size != 0)
 600                                         if (++new_bios_entry >= E820MAX)
 601                                                 break;  /* no more space left for new bios entries */
 602                         }
 603                         if (current_type != 0)  {
 604                                 new_bios[new_bios_entry].addr = change_point[chgidx]->addr;
 605                                 new_bios[new_bios_entry].type = current_type;
 606                                 last_addr=change_point[chgidx]->addr;
 607                         }
 608                         last_type = current_type;
 609                 }
 610         }
 611         new_nr = new_bios_entry;   /* retain count for new bios entries */
 612
 613         /* copy new bios mapping into original location */
 614         memcpy(biosmap, new_bios, new_nr*sizeof(struct e820entry));
 615         *pnr_map = new_nr;
 616
 617         return 0;
 618 }
 619
 620 /*
 621  * Copy the BIOS e820 map into a safe place.
 622  *
 623  * Sanity-check it while we're at it..
 624  *
 625  * If we're lucky and live on a modern system, the setup code
 626  * will have given us a memory map that we can use to properly
 627  * set up memory.  If we aren't, we'll fake a memory map.
 628  *
 629  * We check to see that the memory map contains at least 2 elements
 630  * before we'll use it, because the detection code in setup.S may
 631  * not be perfect and most every PC known to man has two memory
 632  * regions: one from 0 to 640k, and one from 1mb up.  (The IBM
 633  * thinkpad 560x, for example, does not cooperate with the memory
 634  * detection code.)
 635  */
 636 static int __init copy_e820_map(struct e820entry * biosmap, int nr_map)
 637 {
 638         /* Only one memory region (or negative)? Ignore it */
 639         if (nr_map < 2)
 640                 return -1;
 641
 642         do {
 643                 unsigned long long start = biosmap->addr;
 644                 unsigned long long size = biosmap->size;
 645                 unsigned long long end = start + size;
 646                 unsigned long type = biosmap->type;
 647
 648                 /* Overflow in 64 bits? Ignore the memory map. */
 649                 if (start > end)
 650                         return -1;
 651
 652                 /*
 653                  * Some BIOSes claim RAM in the 640k - 1M region.
 654                  * Not right. Fix it up.
 655                  */
 656                 if (type == E820_RAM) {
 657                         if (start < 0x100000ULL && end > 0xA0000ULL) {
 658                                 if (start < 0xA0000ULL)
 659                                         add_memory_region(start, 0xA0000ULL-start, type);
 660                                 if (end <= 0x100000ULL)
 661                                         continue;
 662                                 start = 0x100000ULL;
 663                                 size = end - start;
 664                         }
 665                 }
 666                 add_memory_region(start, size, type);
 667         } while (biosmap++,--nr_map);
 668         return 0;
 669 }
 670
 671 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
 672 struct edd edd;
 673 #ifdef CONFIG_EDD_MODULE
 674 EXPORT_SYMBOL(edd);
 675 #endif
 676 /**
 677  * copy_edd() - Copy the BIOS EDD information
 678  *              from boot_params into a safe place.
 679  *
 680  */
 681 static inline void copy_edd(void)
 682 {
 683      memcpy(edd.mbr_signature, EDD_MBR_SIGNATURE, sizeof(edd.mbr_signature));
 684      memcpy(edd.edd_info, EDD_BUF, sizeof(edd.edd_info));
 685      edd.mbr_signature_nr = EDD_MBR_SIG_NR;
 686      edd.edd_info_nr = EDD_NR;
 687 }
 688 #else
 689 static inline void copy_edd(void)
 690 {
 691 }
 692 #endif
 693
 694 /*
 695  * Do NOT EVER look at the BIOS memory size location.
 696  * It does not work on many machines.
 697  */
 698 #define LOWMEMSIZE()    (0x9f000)
 699
 700 static void __init parse_cmdline_early (char ** cmdline_p)
 701 {
 702         char c = ' ', *to = command_line, *from = saved_command_line;
 703         int len = 0;
 704         int userdef = 0;
 705
 706         /* Save unparsed command line copy for /proc/cmdline */
 707         saved_command_line[COMMAND_LINE_SIZE-1] = '\0';
 708
 709         for (;;) {
 710                 if (c != ' ')
 711                         goto next_char;
 712                 /*
 713                  * "mem=nopentium" disables the 4MB page tables.
 714                  * "mem=XXX[kKmM]" defines a memory region from HIGH_MEM
 715                  * to <mem>, overriding the bios size.
 716                  * "memmap=XXX[KkmM]@XXX[KkmM]" defines a memory region from
 717                  * <start> to <start>+<mem>, overriding the bios size.
 718                  *
 719                  * HPA tells me bootloaders need to parse mem=, so no new
 720                  * option should be mem=  [also see Documentation/i386/boot.txt]
 721                  */
 722                 if (!memcmp(from, "mem=", 4)) {
 723                         if (to != command_line)
 724                                 to--;
 725                         if (!memcmp(from+4, "nopentium", 9)) {
 726                                 from += 9+4;
 727                                 clear_bit(X86_FEATURE_PSE, boot_cpu_data.x86_capability);
 728                                 disable_pse = 1;
 729                         } else {
 730                                 /* If the user specifies memory size, we
 731                                  * limit the BIOS-provided memory map to
 732                                  * that size. exactmap can be used to specify
 733                                  * the exact map. mem=number can be used to
 734                                  * trim the existing memory map.
 735                                  */
 736                                 unsigned long long mem_size;
 737
 738                                 mem_size = memparse(from+4, &from);
 739                                 limit_regions(mem_size);
 740                                 userdef=1;
 741                         }
 742                 }
 743
 744                 else if (!memcmp(from, "memmap=", 7)) {
 745                         if (to != command_line)
 746                                 to--;
 747                         if (!memcmp(from+7, "exactmap", 8)) {
 748 #ifdef CONFIG_CRASH_DUMP
 749                                 /* If we are doing a crash dump, we
 750                                  * still need to know the real mem
 751                                  * size before original memory map is
 752                                  * reset.
 753                                  */
 754                                 find_max_pfn();
 755                                 saved_max_pfn = max_pfn;
 756 #endif
 757                                 from += 8+7;
 758                                 e820.nr_map = 0;
 759                                 userdef = 1;
 760                         } else {
 761                                 /* If the user specifies memory size, we
 762                                  * limit the BIOS-provided memory map to
 763                                  * that size. exactmap can be used to specify
 764                                  * the exact map. mem=number can be used to
 765                                  * trim the existing memory map.
 766                                  */
 767                                 unsigned long long start_at, mem_size;
 768
 769                                 mem_size = memparse(from+7, &from);
 770                                 if (*from == '@') {
 771                                         start_at = memparse(from+1, &from);
 772                                         add_memory_region(start_at, mem_size, E820_RAM);
 773                                 } else if (*from == '#') {
 774                                         start_at = memparse(from+1, &from);
 775                                         add_memory_region(start_at, mem_size, E820_ACPI);
 776                                 } else if (*from == '$') {
 777                                         start_at = memparse(from+1, &from);
 778                                         add_memory_region(start_at, mem_size, E820_RESERVED);
 779                                 } else {
 780                                         limit_regions(mem_size);
 781                                         userdef=1;
 782                                 }
 783                         }
 784                 }
 785
 786                 else if (!memcmp(from, "noexec=", 7))
 787                         noexec_setup(from + 7);
 788
 789
 790 #ifdef  CONFIG_X86_SMP
 791                 /*
 792                  * If the BIOS enumerates physical processors before logical,
 793                  * maxcpus=N at enumeration-time can be used to disable HT.
 794                  */
 795                 else if (!memcmp(from, "maxcpus=", 8)) {
 796                         extern unsigned int maxcpus;
 797
 798                         maxcpus = simple_strtoul(from + 8, NULL, 0);
 799                 }
 800 #endif
 801
 802 #ifdef CONFIG_ACPI
 803                 /* "acpi=off" disables both ACPI table parsing and interpreter */
 804                 else if (!memcmp(from, "acpi=off", 8)) {
 805                         disable_acpi();
 806                 }
 807
 808                 /* acpi=force to over-ride black-list */
 809                 else if (!memcmp(from, "acpi=force", 10)) {
 810                         acpi_force = 1;
 811                         acpi_ht = 1;
 812                         acpi_disabled = 0;
 813                 }
 814
 815                 /* acpi=strict disables out-of-spec workarounds */
 816                 else if (!memcmp(from, "acpi=strict", 11)) {
 817                         acpi_strict = 1;
 818                 }
 819
 820                 /* Limit ACPI just to boot-time to enable HT */
 821                 else if (!memcmp(from, "acpi=ht", 7)) {
 822                         if (!acpi_force)
 823                                 disable_acpi();
 824                         acpi_ht = 1;
 825                 }
 826
 827                 /* "pci=noacpi" disable ACPI IRQ routing and PCI scan */
 828                 else if (!memcmp(from, "pci=noacpi", 10)) {
 829                         acpi_disable_pci();
 830                 }
 831                 /* "acpi=noirq" disables ACPI interrupt routing */
 832                 else if (!memcmp(from, "acpi=noirq", 10)) {
 833                         acpi_noirq_set();
 834                 }
 835
 836                 else if (!memcmp(from, "acpi_sci=edge", 13))
 837                         acpi_sci_flags.trigger =  1;
 838
 839                 else if (!memcmp(from, "acpi_sci=level", 14))
 840                         acpi_sci_flags.trigger = 3;
 841
 842                 else if (!memcmp(from, "acpi_sci=high", 13))
 843                         acpi_sci_flags.polarity = 1;
 844
 845                 else if (!memcmp(from, "acpi_sci=low", 12))
 846                         acpi_sci_flags.polarity = 3;
 847
 848 #ifdef CONFIG_X86_IO_APIC
 849                 else if (!memcmp(from, "acpi_skip_timer_override", 24))
 850                         acpi_skip_timer_override = 1;
 851
 852                 if (!memcmp(from, "disable_timer_pin_1", 19))
 853                         disable_timer_pin_1 = 1;
 854                 if (!memcmp(from, "enable_timer_pin_1", 18))
 855                         disable_timer_pin_1 = -1;
 856
 857                 /* disable IO-APIC */
 858                 else if (!memcmp(from, "noapic", 6))
 859                         disable_ioapic_setup();
 860 #endif /* CONFIG_X86_IO_APIC */
 861 #endif /* CONFIG_ACPI */
 862
 863 #ifdef CONFIG_X86_LOCAL_APIC
 864                 /* enable local APIC */
 865                 else if (!memcmp(from, "lapic", 5))
 866                         lapic_enable();
 867
 868                 /* disable local APIC */
 869                 else if (!memcmp(from, "nolapic", 6))
 870                         lapic_disable();
 871 #endif /* CONFIG_X86_LOCAL_APIC */
 872
 873 #ifdef CONFIG_KEXEC
 874                 /* crashkernel=size@addr specifies the location to reserve for
 875                  * a crash kernel.  By reserving this memory we guarantee
 876                  * that linux never set's it up as a DMA target.
 877                  * Useful for holding code to do something appropriate
 878                  * after a kernel panic.
 879                  */
 880                 else if (!memcmp(from, "crashkernel=", 12)) {
 881                         unsigned long size, base;
 882                         size = memparse(from+12, &from);
 883                         if (*from == '@') {
 884                                 base = memparse(from+1, &from);
 885                                 /* FIXME: Do I want a sanity check
 886                                  * to validate the memory range?
 887                                  */
 888                                 crashk_res.start = base;
 889                                 crashk_res.end   = base + size - 1;
 890                         }
 891                 }
 892 #endif
 893 #ifdef CONFIG_CRASH_DUMP
 894                 /* elfcorehdr= specifies the location of elf core header
 895                  * stored by the crashed kernel.
 896                  */
 897                 else if (!memcmp(from, "elfcorehdr=", 11))
 898                         elfcorehdr_addr = memparse(from+11, &from);
 899 #endif
 900
 901                 /*
 902                  * highmem=size forces highmem to be exactly 'size' bytes.
 903                  * This works even on boxes that have no highmem otherwise.
 904                  * This also works to reduce highmem size on bigger boxes.
 905                  */
 906                 else if (!memcmp(from, "highmem=", 8))
 907                         highmem_pages = memparse(from+8, &from) >> PAGE_SHIFT;
 908
 909                 /*
 910                  * vmalloc=size forces the vmalloc area to be exactly 'size'
 911                  * bytes. This can be used to increase (or decrease) the
 912                  * vmalloc area - the default is 128m.
 913                  */
 914                 else if (!memcmp(from, "vmalloc=", 8))
 915                         __VMALLOC_RESERVE = memparse(from+8, &from);
 916
 917         next_char:
 918                 c = *(from++);
 919                 if (!c)
 920                         break;
 921                 if (COMMAND_LINE_SIZE <= ++len)
 922                         break;
 923                 *(to++) = c;
 924         }
 925         *to = '\0';
 926         *cmdline_p = command_line;
 927         if (userdef) {
 928                 printk(KERN_INFO "user-defined physical RAM map:\n");
 929                 print_memory_map("user");
 930         }
 931 }
 932
 933 /*
 934  * Callback for efi_memory_walk.
 935  */
 936 static int __init
 937 efi_find_max_pfn(unsigned long start, unsigned long end, void *arg)
 938 {
 939         unsigned long *max_pfn = arg, pfn;
 940
 941         if (start < end) {
 942                 pfn = PFN_UP(end -1);
 943                 if (pfn > *max_pfn)
 944                         *max_pfn = pfn;
 945         }
 946         return 0;
 947 }
 948
 949
 950 /*
 951  * Find the highest page frame number we have available
 952  */
 953 void __init find_max_pfn(void)
 954 {
 955         int i;
 956
 957         max_pfn = 0;
 958         if (efi_enabled) {
 959                 efi_memmap_walk(efi_find_max_pfn, &max_pfn);
 960                 return;
 961         }
 962
 963         for (i = 0; i < e820.nr_map; i++) {
 964                 unsigned long start, end;
 965                 /* RAM? */
 966                 if (e820.map[i].type != E820_RAM)
 967                         continue;
 968                 start = PFN_UP(e820.map[i].addr);
 969                 end = PFN_DOWN(e820.map[i].addr + e820.map[i].size);
 970                 if (start >= end)
 971                         continue;
 972                 if (end > max_pfn)
 973                         max_pfn = end;
 974         }
 975 }
 976
 977 /*
 978  * Determine low and high memory ranges:
 979  */
 980 unsigned long __init find_max_low_pfn(void)
 981 {
 982         unsigned long max_low_pfn;
 983
 984         max_low_pfn = max_pfn;
 985         if (max_low_pfn > MAXMEM_PFN) {
 986                 if (highmem_pages == -1)
 987                         highmem_pages = max_pfn - MAXMEM_PFN;
 988                 if (highmem_pages + MAXMEM_PFN < max_pfn)
 989                         max_pfn = MAXMEM_PFN + highmem_pages;
 990                 if (highmem_pages + MAXMEM_PFN > max_pfn) {
 991                         printk("only %luMB highmem pages available, ignoring highmem size of %uMB.\n", pages_to_mb(max_pfn - MAXMEM_PFN), pages_to_mb(highmem_pages));
 992                         highmem_pages = 0;
 993                 }
 994                 max_low_pfn = MAXMEM_PFN;
 995 #ifndef CONFIG_HIGHMEM
 996                 /* Maximum memory usable is what is directly addressable */
 997                 printk(KERN_WARNING "Warning only %ldMB will be used.\n",
 998                                         MAXMEM>>20);
 999                 if (max_pfn > MAX_NONPAE_PFN)
1000                         printk(KERN_WARNING "Use a PAE enabled kernel.\n");
1001                 else
1002                         printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
1003                 max_pfn = MAXMEM_PFN;
1004 #else /* !CONFIG_HIGHMEM */
1005 #ifndef CONFIG_X86_PAE
1006                 if (max_pfn > MAX_NONPAE_PFN) {
1007                         max_pfn = MAX_NONPAE_PFN;
1008                         printk(KERN_WARNING "Warning only 4GB will be used.\n");
1009                         printk(KERN_WARNING "Use a PAE enabled kernel.\n");
1010                 }
1011 #endif /* !CONFIG_X86_PAE */
1012 #endif /* !CONFIG_HIGHMEM */
1013         } else {
1014                 if (highmem_pages == -1)
1015                         highmem_pages = 0;
1016 #ifdef CONFIG_HIGHMEM
1017                 if (highmem_pages >= max_pfn) {
1018                         printk(KERN_ERR "highmem size specified (%uMB) is bigger than pages available (%luMB)!.\n", pages_to_mb(highmem_pages), pages_to_mb(max_pfn));
1019                         highmem_pages = 0;
1020                 }
1021                 if (highmem_pages) {
1022                         if (max_low_pfn-highmem_pages < 64*1024*1024/PAGE_SIZE){
1023                                 printk(KERN_ERR "highmem size %uMB results in smaller than 64MB lowmem, ignoring it.\n", pages_to_mb(highmem_pages));
1024                                 highmem_pages = 0;
1025                         }
1026                         max_low_pfn -= highmem_pages;
1027                 }
1028 #else
1029                 if (highmem_pages)
1030                         printk(KERN_ERR "ignoring highmem size on non-highmem kernel!\n");
1031 #endif
1032         }
1033         return max_low_pfn;
1034 }
1035
1036 /*
1037  * Free all available memory for boot time allocation.  Used
1038  * as a callback function by efi_memory_walk()
1039  */
1040
1041 static int __init
1042 free_available_memory(unsigned long start, unsigned long end, void *arg)
1043 {
1044         /* check max_low_pfn */
1045         if (start >= ((max_low_pfn + 1) << PAGE_SHIFT))
1046                 return 0;
1047         if (end >= ((max_low_pfn + 1) << PAGE_SHIFT))
1048                 end = (max_low_pfn + 1) << PAGE_SHIFT;
1049         if (start < end)
1050                 free_bootmem(start, end - start);
1051
1052         return 0;
1053 }
1054 /*
1055  * Register fully available low RAM pages with the bootmem allocator.
1056  */
1057 static void __init register_bootmem_low_pages(unsigned long max_low_pfn)
1058 {
1059         int i;
1060
1061         if (efi_enabled) {
1062                 efi_memmap_walk(free_available_memory, NULL);
1063                 return;
1064         }
1065         for (i = 0; i < e820.nr_map; i++) {
1066                 unsigned long curr_pfn, last_pfn, size;
1067                 /*
1068                  * Reserve usable low memory
1069                  */
1070                 if (e820.map[i].type != E820_RAM)
1071                         continue;
1072                 /*
1073                  * We are rounding up the start address of usable memory:
1074                  */
1075                 curr_pfn = PFN_UP(e820.map[i].addr);
1076                 if (curr_pfn >= max_low_pfn)
1077                         continue;
1078                 /*
1079                  * ... and at the end of the usable range downwards:
1080                  */
1081                 last_pfn = PFN_DOWN(e820.map[i].addr + e820.map[i].size);
1082
1083                 if (last_pfn > max_low_pfn)
1084                         last_pfn = max_low_pfn;
1085
1086                 /*
1087                  * .. finally, did all the rounding and playing
1088                  * around just make the area go away?
1089                  */
1090                 if (last_pfn <= curr_pfn)
1091                         continue;
1092
1093                 size = last_pfn - curr_pfn;
1094                 free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(size));
1095         }
1096 }
1097
1098 /*
1099  * workaround for Dell systems that neglect to reserve EBDA
1100  */
1101 static void __init reserve_ebda_region(void)
1102 {
1103         unsigned int addr;
1104         addr = get_bios_ebda();
1105         if (addr)
1106                 reserve_bootmem(addr, PAGE_SIZE);
1107 }
1108
1109 #ifndef CONFIG_NEED_MULTIPLE_NODES
1110 void __init setup_bootmem_allocator(void);
1111 static unsigned long __init setup_memory(void)
1112 {
1113         /*
1114          * partially used pages are not usable - thus
1115          * we are rounding upwards:
1116          */
1117         min_low_pfn = PFN_UP(init_pg_tables_end);
1118
1119         find_max_pfn();
1120
1121         max_low_pfn = find_max_low_pfn();
1122
1123 #ifdef CONFIG_HIGHMEM
1124         highstart_pfn = highend_pfn = max_pfn;
1125         if (max_pfn > max_low_pfn) {
1126                 highstart_pfn = max_low_pfn;
1127         }
1128         printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
1129                 pages_to_mb(highend_pfn - highstart_pfn));
1130 #endif
1131         printk(KERN_NOTICE "%ldMB LOWMEM available.\n",
1132                         pages_to_mb(max_low_pfn));
1133
1134         setup_bootmem_allocator();
1135
1136         return max_low_pfn;
1137 }
1138
1139 void __init zone_sizes_init(void)
1140 {
1141         unsigned long zones_size[MAX_NR_ZONES] = {0, 0, 0};
1142         unsigned int max_dma, low;
1143
1144         max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
1145         low = max_low_pfn;
1146
1147         if (low < max_dma)
1148                 zones_size[ZONE_DMA] = low;
1149         else {
1150                 zones_size[ZONE_DMA] = max_dma;
1151                 zones_size[ZONE_NORMAL] = low - max_dma;
1152 #ifdef CONFIG_HIGHMEM
1153                 zones_size[ZONE_HIGHMEM] = highend_pfn - low;
1154 #endif
1155         }
1156         free_area_init(zones_size);
1157 }
1158 #else
1159 extern unsigned long __init setup_memory(void);
1160 extern void zone_sizes_init(void);
1161 #endif /* !CONFIG_NEED_MULTIPLE_NODES */
1162
1163 void __init setup_bootmem_allocator(void)
1164 {
1165         unsigned long bootmap_size;
1166         /*
1167          * Initialize the boot-time allocator (with low memory only):
1168          */
1169         bootmap_size = init_bootmem(min_low_pfn, max_low_pfn);
1170
1171         register_bootmem_low_pages(max_low_pfn);
1172
1173         /*
1174          * Reserve the bootmem bitmap itself as well. We do this in two
1175          * steps (first step was init_bootmem()) because this catches
1176          * the (very unlikely) case of us accidentally initializing the
1177          * bootmem allocator with an invalid RAM area.
1178          */
1179         reserve_bootmem(__PHYSICAL_START, (PFN_PHYS(min_low_pfn) +
1180                          bootmap_size + PAGE_SIZE-1) - (__PHYSICAL_START));
1181
1182         /*
1183          * reserve physical page 0 - it's a special BIOS page on many boxes,
1184          * enabling clean reboots, SMP operation, laptop functions.
1185          */
1186         reserve_bootmem(0, PAGE_SIZE);
1187
1188         /* reserve EBDA region, it's a 4K region */
1189         reserve_ebda_region();
1190
1191     /* could be an AMD 768MPX chipset. Reserve a page  before VGA to prevent
1192        PCI prefetch into it (errata #56). Usually the page is reserved anyways,
1193        unless you have no PS/2 mouse plugged in. */
1194         if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
1195             boot_cpu_data.x86 == 6)
1196              reserve_bootmem(0xa0000 - 4096, 4096);
1197
1198 #ifdef CONFIG_SMP
1199         /*
1200          * But first pinch a few for the stack/trampoline stuff
1201          * FIXME: Don't need the extra page at 4K, but need to fix
1202          * trampoline before removing it. (see the GDT stuff)
1203          */
1204         reserve_bootmem(PAGE_SIZE, PAGE_SIZE);
1205 #endif
1206 #ifdef CONFIG_ACPI_SLEEP
1207         /*
1208          * Reserve low memory region for sleep support.
1209          */
1210         acpi_reserve_bootmem();
1211 #endif
1212 #ifdef CONFIG_X86_FIND_SMP_CONFIG
1213         /*
1214          * Find and reserve possible boot-time SMP configuration:
1215          */
1216         find_smp_config();
1217 #endif
1218
1219 #ifdef CONFIG_BLK_DEV_INITRD
1220         if (LOADER_TYPE && INITRD_START) {
1221                 if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
1222                         reserve_bootmem(INITRD_START, INITRD_SIZE);
1223                         initrd_start =
1224                                 INITRD_START ? INITRD_START + PAGE_OFFSET : 0;
1225                         initrd_end = initrd_start+INITRD_SIZE;
1226                 }
1227                 else {
1228                         printk(KERN_ERR "initrd extends beyond end of memory "
1229                             "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
1230                             INITRD_START + INITRD_SIZE,
1231                             max_low_pfn << PAGE_SHIFT);
1232                         initrd_start = 0;
1233                 }
1234         }
1235 #endif
1236 #ifdef CONFIG_KEXEC
1237         if (crashk_res.start != crashk_res.end)
1238                 reserve_bootmem(crashk_res.start,
1239                         crashk_res.end - crashk_res.start + 1);
1240 #endif
1241 }
1242
1243 /*
1244  * The node 0 pgdat is initialized before all of these because
1245  * it's needed for bootmem.  node>0 pgdats have their virtual
1246  * space allocated before the pagetables are in place to access
1247  * them, so they can't be cleared then.
1248  *
1249  * This should all compile down to nothing when NUMA is off.
1250  */
1251 void __init remapped_pgdat_init(void)
1252 {
1253         int nid;
1254
1255         for_each_online_node(nid) {
1256                 if (nid != 0)
1257                         memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
1258         }
1259 }
1260
1261 /*
1262  * Request address space for all standard RAM and ROM resources
1263  * and also for regions reported as reserved by the e820.
1264  */
1265 static void __init
1266 legacy_init_iomem_resources(struct resource *code_resource, struct resource *data_resource)
1267 {
1268         int i;
1269
1270         probe_roms();
1271         for (i = 0; i < e820.nr_map; i++) {
1272                 struct resource *res;
1273                 if (e820.map[i].addr + e820.map[i].size > 0x100000000ULL)
1274                         continue;
1275                 res = alloc_bootmem_low(sizeof(struct resource));
1276                 switch (e820.map[i].type) {
1277                 case E820_RAM:  res->name = "System RAM"; break;
1278                 case E820_ACPI: res->name = "ACPI Tables"; break;
1279                 case E820_NVS:  res->name = "ACPI Non-volatile Storage"; break;
1280                 default:        res->name = "reserved";
1281                 }
1282                 res->start = e820.map[i].addr;
1283                 res->end = res->start + e820.map[i].size - 1;
1284                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
1285                 request_resource(&iomem_resource, res);
1286                 if (e820.map[i].type == E820_RAM) {
1287                         /*
1288                          *  We don't know which RAM region contains kernel data,
1289                          *  so we try it repeatedly and let the resource manager
1290                          *  test it.
1291                          */
1292                         request_resource(res, code_resource);
1293                         request_resource(res, data_resource);
1294 #ifdef CONFIG_KEXEC
1295                         request_resource(res, &crashk_res);
1296 #endif
1297                 }
1298         }
1299 }
1300
1301 /*
1302  * Request address space for all standard resources
1303  */
1304 static void __init register_memory(void)
1305 {
1306         unsigned long gapstart, gapsize, round;
1307         unsigned long long last;
1308         int           i;
1309
1310         if (efi_enabled)
1311                 efi_initialize_iomem_resources(&code_resource, &data_resource);
1312         else
1313                 legacy_init_iomem_resources(&code_resource, &data_resource);
1314
1315         /* EFI systems may still have VGA */
1316         request_resource(&iomem_resource, &video_ram_resource);
1317
1318         /* request I/O space for devices used on all i[345]86 PCs */
1319         for (i = 0; i < STANDARD_IO_RESOURCES; i++)
1320                 request_resource(&ioport_resource, &standard_io_resources[i]);
1321
1322         /*
1323          * Search for the bigest gap in the low 32 bits of the e820
1324          * memory space.
1325          */
1326         last = 0x100000000ull;
1327         gapstart = 0x10000000;
1328         gapsize = 0x400000;
1329         i = e820.nr_map;
1330         while (--i >= 0) {
1331                 unsigned long long start = e820.map[i].addr;
1332                 unsigned long long end = start + e820.map[i].size;
1333
1334                 /*
1335                  * Since "last" is at most 4GB, we know we'll
1336                  * fit in 32 bits if this condition is true
1337                  */
1338                 if (last > end) {
1339                         unsigned long gap = last - end;
1340
1341                         if (gap > gapsize) {
1342                                 gapsize = gap;
1343                                 gapstart = end;
1344                         }
1345                 }
1346                 if (start < last)
1347                         last = start;
1348         }
1349
1350         /*
1351          * See how much we want to round up: start off with
1352          * rounding to the next 1MB area.
1353          */
1354         round = 0x100000;
1355         while ((gapsize >> 4) > round)
1356                 round += round;
1357         /* Fun with two's complement */
1358         pci_mem_start = (gapstart + round) & -round;
1359
1360         printk("Allocating PCI resources starting at %08lx (gap: %08lx:%08lx)\n",
1361                 pci_mem_start, gapstart, gapsize);
1362 }
1363
1364 /* Use inline assembly to define this because the nops are defined
1365    as inline assembly strings in the include files and we cannot
1366    get them easily into strings. */
1367 asm("\t.data\nintelnops: "
1368     GENERIC_NOP1 GENERIC_NOP2 GENERIC_NOP3 GENERIC_NOP4 GENERIC_NOP5 GENERIC_NOP6
1369     GENERIC_NOP7 GENERIC_NOP8);
1370 asm("\t.data\nk8nops: "
1371     K8_NOP1 K8_NOP2 K8_NOP3 K8_NOP4 K8_NOP5 K8_NOP6
1372     K8_NOP7 K8_NOP8);
1373 asm("\t.data\nk7nops: "
1374     K7_NOP1 K7_NOP2 K7_NOP3 K7_NOP4 K7_NOP5 K7_NOP6
1375     K7_NOP7 K7_NOP8);
1376
1377 extern unsigned char intelnops[], k8nops[], k7nops[];
1378 static unsigned char *intel_nops[ASM_NOP_MAX+1] = {
1379      NULL,
1380      intelnops,
1381      intelnops + 1,
1382      intelnops + 1 + 2,
1383      intelnops + 1 + 2 + 3,
1384      intelnops + 1 + 2 + 3 + 4,
1385      intelnops + 1 + 2 + 3 + 4 + 5,
1386      intelnops + 1 + 2 + 3 + 4 + 5 + 6,
1387      intelnops + 1 + 2 + 3 + 4 + 5 + 6 + 7,
1388 };
1389 static unsigned char *k8_nops[ASM_NOP_MAX+1] = {
1390      NULL,
1391      k8nops,
1392      k8nops + 1,
1393      k8nops + 1 + 2,
1394      k8nops + 1 + 2 + 3,
1395      k8nops + 1 + 2 + 3 + 4,
1396      k8nops + 1 + 2 + 3 + 4 + 5,
1397      k8nops + 1 + 2 + 3 + 4 + 5 + 6,
1398      k8nops + 1 + 2 + 3 + 4 + 5 + 6 + 7,
1399 };
1400 static unsigned char *k7_nops[ASM_NOP_MAX+1] = {
1401      NULL,
1402      k7nops,
1403      k7nops + 1,
1404      k7nops + 1 + 2,
1405      k7nops + 1 + 2 + 3,
1406      k7nops + 1 + 2 + 3 + 4,
1407      k7nops + 1 + 2 + 3 + 4 + 5,
1408      k7nops + 1 + 2 + 3 + 4 + 5 + 6,
1409      k7nops + 1 + 2 + 3 + 4 + 5 + 6 + 7,
1410 };
1411 static struct nop {
1412      int cpuid;
1413      unsigned char **noptable;
1414 } noptypes[] = {
1415      { X86_FEATURE_K8, k8_nops },
1416      { X86_FEATURE_K7, k7_nops },
1417      { -1, NULL }
1418 };
1419
1420 /* Replace instructions with better alternatives for this CPU type.
1421
1422    This runs before SMP is initialized to avoid SMP problems with
1423    self modifying code. This implies that assymetric systems where
1424    APs have less capabilities than the boot processor are not handled.
1425    Tough. Make sure you disable such features by hand. */
1426 void apply_alternatives(void *start, void *end)
1427 {
1428         struct alt_instr *a;
1429         int diff, i, k;
1430         unsigned char **noptable = intel_nops;
1431         for (i = 0; noptypes[i].cpuid >= 0; i++) {
1432                 if (boot_cpu_has(noptypes[i].cpuid)) {
1433                         noptable = noptypes[i].noptable;
1434                         break;
1435                 }
1436         }
1437         for (a = start; (void *)a < end; a++) {
1438                 if (!boot_cpu_has(a->cpuid))
1439                         continue;
1440                 BUG_ON(a->replacementlen > a->instrlen);
1441                 memcpy(a->instr, a->replacement, a->replacementlen);
1442                 diff = a->instrlen - a->replacementlen;
1443                 /* Pad the rest with nops */
1444                 for (i = a->replacementlen; diff > 0; diff -= k, i += k) {
1445                         k = diff;
1446                         if (k > ASM_NOP_MAX)
1447                                 k = ASM_NOP_MAX;
1448                         memcpy(a->instr + i, noptable[k], k);
1449                 }
1450         }
1451 }
1452
1453 void __init alternative_instructions(void)
1454 {
1455         extern struct alt_instr __alt_instructions[], __alt_instructions_end[];
1456         apply_alternatives(__alt_instructions, __alt_instructions_end);
1457 }
1458
1459 static char * __init machine_specific_memory_setup(void);
1460
1461 #ifdef CONFIG_MCA
1462 static void set_mca_bus(int x)
1463 {
1464         MCA_bus = x;
1465 }
1466 #else
1467 static void set_mca_bus(int x) { }
1468 #endif
1469
1470 /*
1471  * Determine if we were loaded by an EFI loader.  If so, then we have also been
1472  * passed the efi memmap, systab, etc., so we should use these data structures
1473  * for initialization.  Note, the efi init code path is determined by the
1474  * global efi_enabled. This allows the same kernel image to be used on existing
1475  * systems (with a traditional BIOS) as well as on EFI systems.
1476  */
1477 void __init setup_arch(char **cmdline_p)
1478 {
1479         unsigned long max_low_pfn;
1480
1481         memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
1482         pre_setup_arch_hook();
1483         early_cpu_init();
1484
1485         /*
1486          * FIXME: This isn't an official loader_type right
1487          * now but does currently work with elilo.
1488          * If we were configured as an EFI kernel, check to make
1489          * sure that we were loaded correctly from elilo and that
1490          * the system table is valid.  If not, then initialize normally.
1491          */
1492 #ifdef CONFIG_EFI
1493         if ((LOADER_TYPE == 0x50) && EFI_SYSTAB)
1494                 efi_enabled = 1;
1495 #endif
1496
1497         ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
1498         drive_info = DRIVE_INFO;
1499         screen_info = SCREEN_INFO;
1500         edid_info = EDID_INFO;
1501         apm_info.bios = APM_BIOS_INFO;
1502         ist_info = IST_INFO;
1503         saved_videomode = VIDEO_MODE;
1504         if( SYS_DESC_TABLE.length != 0 ) {
1505                 set_mca_bus(SYS_DESC_TABLE.table[3] & 0x2);
1506                 machine_id = SYS_DESC_TABLE.table[0];
1507                 machine_submodel_id = SYS_DESC_TABLE.table[1];
1508                 BIOS_revision = SYS_DESC_TABLE.table[2];
1509         }
1510         bootloader_type = LOADER_TYPE;
1511
1512 #ifdef CONFIG_BLK_DEV_RAM
1513         rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
1514         rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
1515         rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
1516 #endif
1517         ARCH_SETUP
1518         if (efi_enabled)
1519                 efi_init();
1520         else {
1521                 printk(KERN_INFO "BIOS-provided physical RAM map:\n");
1522                 print_memory_map(machine_specific_memory_setup());
1523         }
1524
1525         copy_edd();
1526
1527         if (!MOUNT_ROOT_RDONLY)
1528                 root_mountflags &= ~MS_RDONLY;
1529         init_mm.start_code = (unsigned long) _text;
1530         init_mm.end_code = (unsigned long) _etext;
1531         init_mm.end_data = (unsigned long) _edata;
1532         init_mm.brk = init_pg_tables_end + PAGE_OFFSET;
1533
1534         code_resource.start = virt_to_phys(_text);
1535         code_resource.end = virt_to_phys(_etext)-1;
1536         data_resource.start = virt_to_phys(_etext);
1537         data_resource.end = virt_to_phys(_edata)-1;
1538
1539         parse_cmdline_early(cmdline_p);
1540
1541         max_low_pfn = setup_memory();
1542
1543         /*
1544          * NOTE: before this point _nobody_ is allowed to allocate
1545          * any memory using the bootmem allocator.  Although the
1546          * alloctor is now initialised only the first 8Mb of the kernel
1547          * virtual address space has been mapped.  All allocations before
1548          * paging_init() has completed must use the alloc_bootmem_low_pages()
1549          * variant (which allocates DMA'able memory) and care must be taken
1550          * not to exceed the 8Mb limit.
1551          */
1552
1553 #ifdef CONFIG_SMP
1554         smp_alloc_memory(); /* AP processor realmode stacks in low memory*/
1555 #endif
1556         paging_init();
1557         remapped_pgdat_init();
1558         sparse_init();
1559         zone_sizes_init();
1560
1561         /*
1562          * NOTE: at this point the bootmem allocator is fully available.
1563          */
1564
1565 #ifdef CONFIG_EARLY_PRINTK
1566         {
1567                 char *s = strstr(*cmdline_p, "earlyprintk=");
1568                 if (s) {
1569                         extern void setup_early_printk(char *);
1570
1571                         setup_early_printk(s);
1572                         printk("early console enabled\n");
1573                 }
1574         }
1575 #endif
1576
1577
1578         dmi_scan_machine();
1579
1580 #ifdef CONFIG_X86_GENERICARCH
1581         generic_apic_probe(*cmdline_p);
1582 #endif
1583         if (efi_enabled)
1584                 efi_map_memmap();
1585
1586 #ifdef CONFIG_ACPI
1587         /*
1588          * Parse the ACPI tables for possible boot-time SMP configuration.
1589          */
1590         acpi_boot_table_init();
1591         acpi_boot_init();
1592
1593 #if defined(CONFIG_SMP) && defined(CONFIG_X86_PC)
1594         if (def_to_bigsmp)
1595                 printk(KERN_WARNING "More than 8 CPUs detected and "
1596                         "CONFIG_X86_PC cannot handle it.\nUse "
1597                         "CONFIG_X86_GENERICARCH or CONFIG_X86_BIGSMP.\n");
1598 #endif
1599 #endif
1600 #ifdef CONFIG_X86_LOCAL_APIC
1601         if (smp_found_config)
1602                 get_smp_config();
1603 #endif
1604
1605         register_memory();
1606
1607 #ifdef CONFIG_VT
1608 #if defined(CONFIG_VGA_CONSOLE)
1609         if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
1610                 conswitchp = &vga_con;
1611 #elif defined(CONFIG_DUMMY_CONSOLE)
1612         conswitchp = &dummy_con;
1613 #endif
1614 #endif
1615 }
1616
1617 #include "setup_arch_post.h"
1618 /*
1619  * Local Variables:
1620  * mode:c
1621  * c-file-style:"k&r"
1622  * c-basic-offset:8
1623  * End:
1624  */