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/platform_device.h>
  38 #include <linux/console.h>
  39 #include <linux/mca.h>
  40 #include <linux/root_dev.h>
  41 #include <linux/highmem.h>
  42 #include <linux/module.h>
  43 #include <linux/efi.h>
  44 #include <linux/init.h>
  45 #include <linux/edd.h>
  46 #include <linux/nodemask.h>
  47 #include <linux/kexec.h>
  48 #include <linux/crash_dump.h>
  49 #include <linux/dmi.h>
  50 #include <linux/pfn.h>
  51
  52 #include <video/edid.h>
  53
  54 #include <asm/apic.h>
  55 #include <asm/e820.h>
  56 #include <asm/mpspec.h>
  57 #include <asm/setup.h>
  58 #include <asm/arch_hooks.h>
  59 #include <asm/sections.h>
  60 #include <asm/io_apic.h>
  61 #include <asm/ist.h>
  62 #include <asm/io.h>
  63 #include "setup_arch_pre.h"
  64 #include <bios_ebda.h>
  65
  66 /* Forward Declaration. */
  67 void __init find_max_pfn(void);
  68
  69 /* This value is set up by the early boot code to point to the value
  70    immediately after the boot time page tables.  It contains a *physical*
  71    address, and must not be in the .bss segment! */
  72 unsigned long init_pg_tables_end __initdata = ~0UL;
  73
  74 int disable_pse __devinitdata = 0;
  75
  76 /*
  77  * Machine setup..
  78  */
  79
  80 #ifdef CONFIG_EFI
  81 int efi_enabled = 0;
  82 EXPORT_SYMBOL(efi_enabled);
  83 #endif
  84
  85 /* cpu data as detected by the assembly code in head.S */
  86 struct cpuinfo_x86 new_cpu_data __initdata = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
  87 /* common cpu data for all cpus */
  88 struct cpuinfo_x86 boot_cpu_data __read_mostly = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
  89 EXPORT_SYMBOL(boot_cpu_data);
  90
  91 unsigned long mmu_cr4_features;
  92
  93 #ifdef  CONFIG_ACPI
  94         int acpi_disabled = 0;
  95 #else
  96         int acpi_disabled = 1;
  97 #endif
  98 EXPORT_SYMBOL(acpi_disabled);
  99
 100 #ifdef  CONFIG_ACPI
 101 int __initdata acpi_force = 0;
 102 extern acpi_interrupt_flags     acpi_sci_flags;
 103 #endif
 104
 105 /* for MCA, but anyone else can use it if they want */
 106 unsigned int machine_id;
 107 #ifdef CONFIG_MCA
 108 EXPORT_SYMBOL(machine_id);
 109 #endif
 110 unsigned int machine_submodel_id;
 111 unsigned int BIOS_revision;
 112 unsigned int mca_pentium_flag;
 113
 114 /* For PCI or other memory-mapped resources */
 115 unsigned long pci_mem_start = 0x10000000;
 116 #ifdef CONFIG_PCI
 117 EXPORT_SYMBOL(pci_mem_start);
 118 #endif
 119
 120 /* Boot loader ID as an integer, for the benefit of proc_dointvec */
 121 int bootloader_type;
 122
 123 /* user-defined highmem size */
 124 static unsigned int highmem_pages = -1;
 125
 126 /*
 127  * Setup options
 128  */
 129 struct drive_info_struct { char dummy[32]; } drive_info;
 130 #if defined(CONFIG_BLK_DEV_IDE) || defined(CONFIG_BLK_DEV_HD) || \
 131     defined(CONFIG_BLK_DEV_IDE_MODULE) || defined(CONFIG_BLK_DEV_HD_MODULE)
 132 EXPORT_SYMBOL(drive_info);
 133 #endif
 134 struct screen_info screen_info;
 135 EXPORT_SYMBOL(screen_info);
 136 struct apm_info apm_info;
 137 EXPORT_SYMBOL(apm_info);
 138 struct sys_desc_table_struct {
 139         unsigned short length;
 140         unsigned char table[0];
 141 };
 142 struct edid_info edid_info;
 143 EXPORT_SYMBOL_GPL(edid_info);
 144 struct ist_info ist_info;
 145 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
 146         defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
 147 EXPORT_SYMBOL(ist_info);
 148 #endif
 149 struct e820map e820;
 150
 151 extern void early_cpu_init(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                 current_addr = e820.map[i].addr + e820.map[i].size;
 393                 if (current_addr < size)
 394                         continue;
 395
 396                 if (e820.map[i].type != E820_RAM)
 397                         continue;
 398
 399                 if (e820.map[i].addr >= size) {
 400                         /*
 401                          * This region starts past the end of the
 402                          * requested size, skip it completely.
 403                          */
 404                         e820.nr_map = i;
 405                 } else {
 406                         e820.nr_map = i + 1;
 407                         e820.map[i].size -= current_addr - size;
 408                 }
 409                 return;
 410         }
 411 }
 412
 413 static void __init add_memory_region(unsigned long long start,
 414                                   unsigned long long size, int type)
 415 {
 416         int x;
 417
 418         if (!efi_enabled) {
 419                 x = e820.nr_map;
 420
 421                 if (x == E820MAX) {
 422                     printk(KERN_ERR "Ooops! Too many entries in the memory map!\n");
 423                     return;
 424                 }
 425
 426                 e820.map[x].addr = start;
 427                 e820.map[x].size = size;
 428                 e820.map[x].type = type;
 429                 e820.nr_map++;
 430         }
 431 } /* add_memory_region */
 432
 433 #define E820_DEBUG      1
 434
 435 static void __init print_memory_map(char *who)
 436 {
 437         int i;
 438
 439         for (i = 0; i < e820.nr_map; i++) {
 440                 printk(" %s: %016Lx - %016Lx ", who,
 441                         e820.map[i].addr,
 442                         e820.map[i].addr + e820.map[i].size);
 443                 switch (e820.map[i].type) {
 444                 case E820_RAM:  printk("(usable)\n");
 445                                 break;
 446                 case E820_RESERVED:
 447                                 printk("(reserved)\n");
 448                                 break;
 449                 case E820_ACPI:
 450                                 printk("(ACPI data)\n");
 451                                 break;
 452                 case E820_NVS:
 453                                 printk("(ACPI NVS)\n");
 454                                 break;
 455                 default:        printk("type %lu\n", e820.map[i].type);
 456                                 break;
 457                 }
 458         }
 459 }
 460
 461 /*
 462  * Sanitize the BIOS e820 map.
 463  *
 464  * Some e820 responses include overlapping entries.  The following
 465  * replaces the original e820 map with a new one, removing overlaps.
 466  *
 467  */
 468 struct change_member {
 469         struct e820entry *pbios; /* pointer to original bios entry */
 470         unsigned long long addr; /* address for this change point */
 471 };
 472 static struct change_member change_point_list[2*E820MAX] __initdata;
 473 static struct change_member *change_point[2*E820MAX] __initdata;
 474 static struct e820entry *overlap_list[E820MAX] __initdata;
 475 static struct e820entry new_bios[E820MAX] __initdata;
 476
 477 static int __init sanitize_e820_map(struct e820entry * biosmap, char * pnr_map)
 478 {
 479         struct change_member *change_tmp;
 480         unsigned long current_type, last_type;
 481         unsigned long long last_addr;
 482         int chgidx, still_changing;
 483         int overlap_entries;
 484         int new_bios_entry;
 485         int old_nr, new_nr, chg_nr;
 486         int i;
 487
 488         /*
 489                 Visually we're performing the following (1,2,3,4 = memory types)...
 490
 491                 Sample memory map (w/overlaps):
 492                    ____22__________________
 493                    ______________________4_
 494                    ____1111________________
 495                    _44_____________________
 496                    11111111________________
 497                    ____________________33__
 498                    ___________44___________
 499                    __________33333_________
 500                    ______________22________
 501                    ___________________2222_
 502                    _________111111111______
 503                    _____________________11_
 504                    _________________4______
 505
 506                 Sanitized equivalent (no overlap):
 507                    1_______________________
 508                    _44_____________________
 509                    ___1____________________
 510                    ____22__________________
 511                    ______11________________
 512                    _________1______________
 513                    __________3_____________
 514                    ___________44___________
 515                    _____________33_________
 516                    _______________2________
 517                    ________________1_______
 518                    _________________4______
 519                    ___________________2____
 520                    ____________________33__
 521                    ______________________4_
 522         */
 523
 524         /* if there's only one memory region, don't bother */
 525         if (*pnr_map < 2)
 526                 return -1;
 527
 528         old_nr = *pnr_map;
 529
 530         /* bail out if we find any unreasonable addresses in bios map */
 531         for (i=0; i<old_nr; i++)
 532                 if (biosmap[i].addr + biosmap[i].size < biosmap[i].addr)
 533                         return -1;
 534
 535         /* create pointers for initial change-point information (for sorting) */
 536         for (i=0; i < 2*old_nr; i++)
 537                 change_point[i] = &change_point_list[i];
 538
 539         /* record all known change-points (starting and ending addresses),
 540            omitting those that are for empty memory regions */
 541         chgidx = 0;
 542         for (i=0; i < old_nr; i++)      {
 543                 if (biosmap[i].size != 0) {
 544                         change_point[chgidx]->addr = biosmap[i].addr;
 545                         change_point[chgidx++]->pbios = &biosmap[i];
 546                         change_point[chgidx]->addr = biosmap[i].addr + biosmap[i].size;
 547                         change_point[chgidx++]->pbios = &biosmap[i];
 548                 }
 549         }
 550         chg_nr = chgidx;        /* true number of change-points */
 551
 552         /* sort change-point list by memory addresses (low -> high) */
 553         still_changing = 1;
 554         while (still_changing)  {
 555                 still_changing = 0;
 556                 for (i=1; i < chg_nr; i++)  {
 557                         /* if <current_addr> > <last_addr>, swap */
 558                         /* or, if current=<start_addr> & last=<end_addr>, swap */
 559                         if ((change_point[i]->addr < change_point[i-1]->addr) ||
 560                                 ((change_point[i]->addr == change_point[i-1]->addr) &&
 561                                  (change_point[i]->addr == change_point[i]->pbios->addr) &&
 562                                  (change_point[i-1]->addr != change_point[i-1]->pbios->addr))
 563                            )
 564                         {
 565                                 change_tmp = change_point[i];
 566                                 change_point[i] = change_point[i-1];
 567                                 change_point[i-1] = change_tmp;
 568                                 still_changing=1;
 569                         }
 570                 }
 571         }
 572
 573         /* create a new bios memory map, removing overlaps */
 574         overlap_entries=0;       /* number of entries in the overlap table */
 575         new_bios_entry=0;        /* index for creating new bios map entries */
 576         last_type = 0;           /* start with undefined memory type */
 577         last_addr = 0;           /* start with 0 as last starting address */
 578         /* loop through change-points, determining affect on the new bios map */
 579         for (chgidx=0; chgidx < chg_nr; chgidx++)
 580         {
 581                 /* keep track of all overlapping bios entries */
 582                 if (change_point[chgidx]->addr == change_point[chgidx]->pbios->addr)
 583                 {
 584                         /* add map entry to overlap list (> 1 entry implies an overlap) */
 585                         overlap_list[overlap_entries++]=change_point[chgidx]->pbios;
 586                 }
 587                 else
 588                 {
 589                         /* remove entry from list (order independent, so swap with last) */
 590                         for (i=0; i<overlap_entries; i++)
 591                         {
 592                                 if (overlap_list[i] == change_point[chgidx]->pbios)
 593                                         overlap_list[i] = overlap_list[overlap_entries-1];
 594                         }
 595                         overlap_entries--;
 596                 }
 597                 /* if there are overlapping entries, decide which "type" to use */
 598                 /* (larger value takes precedence -- 1=usable, 2,3,4,4+=unusable) */
 599                 current_type = 0;
 600                 for (i=0; i<overlap_entries; i++)
 601                         if (overlap_list[i]->type > current_type)
 602                                 current_type = overlap_list[i]->type;
 603                 /* continue building up new bios map based on this information */
 604                 if (current_type != last_type)  {
 605                         if (last_type != 0)      {
 606                                 new_bios[new_bios_entry].size =
 607                                         change_point[chgidx]->addr - last_addr;
 608                                 /* move forward only if the new size was non-zero */
 609                                 if (new_bios[new_bios_entry].size != 0)
 610                                         if (++new_bios_entry >= E820MAX)
 611                                                 break;  /* no more space left for new bios entries */
 612                         }
 613                         if (current_type != 0)  {
 614                                 new_bios[new_bios_entry].addr = change_point[chgidx]->addr;
 615                                 new_bios[new_bios_entry].type = current_type;
 616                                 last_addr=change_point[chgidx]->addr;
 617                         }
 618                         last_type = current_type;
 619                 }
 620         }
 621         new_nr = new_bios_entry;   /* retain count for new bios entries */
 622
 623         /* copy new bios mapping into original location */
 624         memcpy(biosmap, new_bios, new_nr*sizeof(struct e820entry));
 625         *pnr_map = new_nr;
 626
 627         return 0;
 628 }
 629
 630 /*
 631  * Copy the BIOS e820 map into a safe place.
 632  *
 633  * Sanity-check it while we're at it..
 634  *
 635  * If we're lucky and live on a modern system, the setup code
 636  * will have given us a memory map that we can use to properly
 637  * set up memory.  If we aren't, we'll fake a memory map.
 638  *
 639  * We check to see that the memory map contains at least 2 elements
 640  * before we'll use it, because the detection code in setup.S may
 641  * not be perfect and most every PC known to man has two memory
 642  * regions: one from 0 to 640k, and one from 1mb up.  (The IBM
 643  * thinkpad 560x, for example, does not cooperate with the memory
 644  * detection code.)
 645  */
 646 static int __init copy_e820_map(struct e820entry * biosmap, int nr_map)
 647 {
 648         /* Only one memory region (or negative)? Ignore it */
 649         if (nr_map < 2)
 650                 return -1;
 651
 652         do {
 653                 unsigned long long start = biosmap->addr;
 654                 unsigned long long size = biosmap->size;
 655                 unsigned long long end = start + size;
 656                 unsigned long type = biosmap->type;
 657
 658                 /* Overflow in 64 bits? Ignore the memory map. */
 659                 if (start > end)
 660                         return -1;
 661
 662                 /*
 663                  * Some BIOSes claim RAM in the 640k - 1M region.
 664                  * Not right. Fix it up.
 665                  */
 666                 if (type == E820_RAM) {
 667                         if (start < 0x100000ULL && end > 0xA0000ULL) {
 668                                 if (start < 0xA0000ULL)
 669                                         add_memory_region(start, 0xA0000ULL-start, type);
 670                                 if (end <= 0x100000ULL)
 671                                         continue;
 672                                 start = 0x100000ULL;
 673                                 size = end - start;
 674                         }
 675                 }
 676                 add_memory_region(start, size, type);
 677         } while (biosmap++,--nr_map);
 678         return 0;
 679 }
 680
 681 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
 682 struct edd edd;
 683 #ifdef CONFIG_EDD_MODULE
 684 EXPORT_SYMBOL(edd);
 685 #endif
 686 /**
 687  * copy_edd() - Copy the BIOS EDD information
 688  *              from boot_params into a safe place.
 689  *
 690  */
 691 static inline void copy_edd(void)
 692 {
 693      memcpy(edd.mbr_signature, EDD_MBR_SIGNATURE, sizeof(edd.mbr_signature));
 694      memcpy(edd.edd_info, EDD_BUF, sizeof(edd.edd_info));
 695      edd.mbr_signature_nr = EDD_MBR_SIG_NR;
 696      edd.edd_info_nr = EDD_NR;
 697 }
 698 #else
 699 static inline void copy_edd(void)
 700 {
 701 }
 702 #endif
 703
 704 /*
 705  * Do NOT EVER look at the BIOS memory size location.
 706  * It does not work on many machines.
 707  */
 708 #define LOWMEMSIZE()    (0x9f000)
 709
 710 static void __init parse_cmdline_early (char ** cmdline_p)
 711 {
 712         char c = ' ', *to = command_line, *from = saved_command_line;
 713         int len = 0;
 714         int userdef = 0;
 715
 716         /* Save unparsed command line copy for /proc/cmdline */
 717         saved_command_line[COMMAND_LINE_SIZE-1] = '\0';
 718
 719         for (;;) {
 720                 if (c != ' ')
 721                         goto next_char;
 722                 /*
 723                  * "mem=nopentium" disables the 4MB page tables.
 724                  * "mem=XXX[kKmM]" defines a memory region from HIGH_MEM
 725                  * to <mem>, overriding the bios size.
 726                  * "memmap=XXX[KkmM]@XXX[KkmM]" defines a memory region from
 727                  * <start> to <start>+<mem>, overriding the bios size.
 728                  *
 729                  * HPA tells me bootloaders need to parse mem=, so no new
 730                  * option should be mem=  [also see Documentation/i386/boot.txt]
 731                  */
 732                 if (!memcmp(from, "mem=", 4)) {
 733                         if (to != command_line)
 734                                 to--;
 735                         if (!memcmp(from+4, "nopentium", 9)) {
 736                                 from += 9+4;
 737                                 clear_bit(X86_FEATURE_PSE, boot_cpu_data.x86_capability);
 738                                 disable_pse = 1;
 739                         } else {
 740                                 /* If the user specifies memory size, we
 741                                  * limit the BIOS-provided memory map to
 742                                  * that size. exactmap can be used to specify
 743                                  * the exact map. mem=number can be used to
 744                                  * trim the existing memory map.
 745                                  */
 746                                 unsigned long long mem_size;
 747
 748                                 mem_size = memparse(from+4, &from);
 749                                 limit_regions(mem_size);
 750                                 userdef=1;
 751                         }
 752                 }
 753
 754                 else if (!memcmp(from, "memmap=", 7)) {
 755                         if (to != command_line)
 756                                 to--;
 757                         if (!memcmp(from+7, "exactmap", 8)) {
 758 #ifdef CONFIG_CRASH_DUMP
 759                                 /* If we are doing a crash dump, we
 760                                  * still need to know the real mem
 761                                  * size before original memory map is
 762                                  * reset.
 763                                  */
 764                                 find_max_pfn();
 765                                 saved_max_pfn = max_pfn;
 766 #endif
 767                                 from += 8+7;
 768                                 e820.nr_map = 0;
 769                                 userdef = 1;
 770                         } else {
 771                                 /* If the user specifies memory size, we
 772                                  * limit the BIOS-provided memory map to
 773                                  * that size. exactmap can be used to specify
 774                                  * the exact map. mem=number can be used to
 775                                  * trim the existing memory map.
 776                                  */
 777                                 unsigned long long start_at, mem_size;
 778
 779                                 mem_size = memparse(from+7, &from);
 780                                 if (*from == '@') {
 781                                         start_at = memparse(from+1, &from);
 782                                         add_memory_region(start_at, mem_size, E820_RAM);
 783                                 } else if (*from == '#') {
 784                                         start_at = memparse(from+1, &from);
 785                                         add_memory_region(start_at, mem_size, E820_ACPI);
 786                                 } else if (*from == '$') {
 787                                         start_at = memparse(from+1, &from);
 788                                         add_memory_region(start_at, mem_size, E820_RESERVED);
 789                                 } else {
 790                                         limit_regions(mem_size);
 791                                         userdef=1;
 792                                 }
 793                         }
 794                 }
 795
 796                 else if (!memcmp(from, "noexec=", 7))
 797                         noexec_setup(from + 7);
 798
 799
 800 #ifdef  CONFIG_X86_SMP
 801                 /*
 802                  * If the BIOS enumerates physical processors before logical,
 803                  * maxcpus=N at enumeration-time can be used to disable HT.
 804                  */
 805                 else if (!memcmp(from, "maxcpus=", 8)) {
 806                         extern unsigned int maxcpus;
 807
 808                         maxcpus = simple_strtoul(from + 8, NULL, 0);
 809                 }
 810 #endif
 811
 812 #ifdef CONFIG_ACPI
 813                 /* "acpi=off" disables both ACPI table parsing and interpreter */
 814                 else if (!memcmp(from, "acpi=off", 8)) {
 815                         disable_acpi();
 816                 }
 817
 818                 /* acpi=force to over-ride black-list */
 819                 else if (!memcmp(from, "acpi=force", 10)) {
 820                         acpi_force = 1;
 821                         acpi_ht = 1;
 822                         acpi_disabled = 0;
 823                 }
 824
 825                 /* acpi=strict disables out-of-spec workarounds */
 826                 else if (!memcmp(from, "acpi=strict", 11)) {
 827                         acpi_strict = 1;
 828                 }
 829
 830                 /* Limit ACPI just to boot-time to enable HT */
 831                 else if (!memcmp(from, "acpi=ht", 7)) {
 832                         if (!acpi_force)
 833                                 disable_acpi();
 834                         acpi_ht = 1;
 835                 }
 836
 837                 /* "pci=noacpi" disable ACPI IRQ routing and PCI scan */
 838                 else if (!memcmp(from, "pci=noacpi", 10)) {
 839                         acpi_disable_pci();
 840                 }
 841                 /* "acpi=noirq" disables ACPI interrupt routing */
 842                 else if (!memcmp(from, "acpi=noirq", 10)) {
 843                         acpi_noirq_set();
 844                 }
 845
 846                 else if (!memcmp(from, "acpi_sci=edge", 13))
 847                         acpi_sci_flags.trigger =  1;
 848
 849                 else if (!memcmp(from, "acpi_sci=level", 14))
 850                         acpi_sci_flags.trigger = 3;
 851
 852                 else if (!memcmp(from, "acpi_sci=high", 13))
 853                         acpi_sci_flags.polarity = 1;
 854
 855                 else if (!memcmp(from, "acpi_sci=low", 12))
 856                         acpi_sci_flags.polarity = 3;
 857
 858 #ifdef CONFIG_X86_IO_APIC
 859                 else if (!memcmp(from, "acpi_skip_timer_override", 24))
 860                         acpi_skip_timer_override = 1;
 861
 862                 if (!memcmp(from, "disable_timer_pin_1", 19))
 863                         disable_timer_pin_1 = 1;
 864                 if (!memcmp(from, "enable_timer_pin_1", 18))
 865                         disable_timer_pin_1 = -1;
 866
 867                 /* disable IO-APIC */
 868                 else if (!memcmp(from, "noapic", 6))
 869                         disable_ioapic_setup();
 870 #endif /* CONFIG_X86_IO_APIC */
 871 #endif /* CONFIG_ACPI */
 872
 873 #ifdef CONFIG_X86_LOCAL_APIC
 874                 /* enable local APIC */
 875                 else if (!memcmp(from, "lapic", 5))
 876                         lapic_enable();
 877
 878                 /* disable local APIC */
 879                 else if (!memcmp(from, "nolapic", 6))
 880                         lapic_disable();
 881 #endif /* CONFIG_X86_LOCAL_APIC */
 882
 883 #ifdef CONFIG_KEXEC
 884                 /* crashkernel=size@addr specifies the location to reserve for
 885                  * a crash kernel.  By reserving this memory we guarantee
 886                  * that linux never set's it up as a DMA target.
 887                  * Useful for holding code to do something appropriate
 888                  * after a kernel panic.
 889                  */
 890                 else if (!memcmp(from, "crashkernel=", 12)) {
 891                         unsigned long size, base;
 892                         size = memparse(from+12, &from);
 893                         if (*from == '@') {
 894                                 base = memparse(from+1, &from);
 895                                 /* FIXME: Do I want a sanity check
 896                                  * to validate the memory range?
 897                                  */
 898                                 crashk_res.start = base;
 899                                 crashk_res.end   = base + size - 1;
 900                         }
 901                 }
 902 #endif
 903 #ifdef CONFIG_PROC_VMCORE
 904                 /* elfcorehdr= specifies the location of elf core header
 905                  * stored by the crashed kernel.
 906                  */
 907                 else if (!memcmp(from, "elfcorehdr=", 11))
 908                         elfcorehdr_addr = memparse(from+11, &from);
 909 #endif
 910
 911                 /*
 912                  * highmem=size forces highmem to be exactly 'size' bytes.
 913                  * This works even on boxes that have no highmem otherwise.
 914                  * This also works to reduce highmem size on bigger boxes.
 915                  */
 916                 else if (!memcmp(from, "highmem=", 8))
 917                         highmem_pages = memparse(from+8, &from) >> PAGE_SHIFT;
 918
 919                 /*
 920                  * vmalloc=size forces the vmalloc area to be exactly 'size'
 921                  * bytes. This can be used to increase (or decrease) the
 922                  * vmalloc area - the default is 128m.
 923                  */
 924                 else if (!memcmp(from, "vmalloc=", 8))
 925                         __VMALLOC_RESERVE = memparse(from+8, &from);
 926
 927         next_char:
 928                 c = *(from++);
 929                 if (!c)
 930                         break;
 931                 if (COMMAND_LINE_SIZE <= ++len)
 932                         break;
 933                 *(to++) = c;
 934         }
 935         *to = '\0';
 936         *cmdline_p = command_line;
 937         if (userdef) {
 938                 printk(KERN_INFO "user-defined physical RAM map:\n");
 939                 print_memory_map("user");
 940         }
 941 }
 942
 943 /*
 944  * Callback for efi_memory_walk.
 945  */
 946 static int __init
 947 efi_find_max_pfn(unsigned long start, unsigned long end, void *arg)
 948 {
 949         unsigned long *max_pfn = arg, pfn;
 950
 951         if (start < end) {
 952                 pfn = PFN_UP(end -1);
 953                 if (pfn > *max_pfn)
 954                         *max_pfn = pfn;
 955         }
 956         return 0;
 957 }
 958
 959 static int __init
 960 efi_memory_present_wrapper(unsigned long start, unsigned long end, void *arg)
 961 {
 962         memory_present(0, start, end);
 963         return 0;
 964 }
 965
 966  /*
 967   * This function checks if the entire range <start,end> is mapped with type.
 968   *
 969   * Note: this function only works correct if the e820 table is sorted and
 970   * not-overlapping, which is the case
 971   */
 972 int __init
 973 e820_all_mapped(unsigned long start, unsigned long end, unsigned type)
 974 {
 975         int i;
 976         for (i = 0; i < e820.nr_map; i++) {
 977                 struct e820entry *ei = &e820.map[i];
 978                 if (type && ei->type != type)
 979                         continue;
 980                 /* is the region (part) in overlap with the current region ?*/
 981                 if (ei->addr >= end || ei->addr + ei->size <= start)
 982                         continue;
 983                 /* if the region is at the beginning of <start,end> we move
 984                  * start to the end of the region since it's ok until there
 985                  */
 986                 if (ei->addr <= start)
 987                         start = ei->addr + ei->size;
 988                 /* if start is now at or beyond end, we're done, full
 989                  * coverage */
 990                 if (start >= end)
 991                         return 1; /* we're done */
 992         }
 993         return 0;
 994 }
 995
 996 /*
 997  * Find the highest page frame number we have available
 998  */
 999 void __init find_max_pfn(void)
1000 {
1001         int i;
1002
1003         max_pfn = 0;
1004         if (efi_enabled) {
1005                 efi_memmap_walk(efi_find_max_pfn, &max_pfn);
1006                 efi_memmap_walk(efi_memory_present_wrapper, NULL);
1007                 return;
1008         }
1009
1010         for (i = 0; i < e820.nr_map; i++) {
1011                 unsigned long start, end;
1012                 /* RAM? */
1013                 if (e820.map[i].type != E820_RAM)
1014                         continue;
1015                 start = PFN_UP(e820.map[i].addr);
1016                 end = PFN_DOWN(e820.map[i].addr + e820.map[i].size);
1017                 if (start >= end)
1018                         continue;
1019                 if (end > max_pfn)
1020                         max_pfn = end;
1021                 memory_present(0, start, end);
1022         }
1023 }
1024
1025 /*
1026  * Determine low and high memory ranges:
1027  */
1028 unsigned long __init find_max_low_pfn(void)
1029 {
1030         unsigned long max_low_pfn;
1031
1032         max_low_pfn = max_pfn;
1033         if (max_low_pfn > MAXMEM_PFN) {
1034                 if (highmem_pages == -1)
1035                         highmem_pages = max_pfn - MAXMEM_PFN;
1036                 if (highmem_pages + MAXMEM_PFN < max_pfn)
1037                         max_pfn = MAXMEM_PFN + highmem_pages;
1038                 if (highmem_pages + MAXMEM_PFN > max_pfn) {
1039                         printk("only %luMB highmem pages available, ignoring highmem size of %uMB.\n", pages_to_mb(max_pfn - MAXMEM_PFN), pages_to_mb(highmem_pages));
1040                         highmem_pages = 0;
1041                 }
1042                 max_low_pfn = MAXMEM_PFN;
1043 #ifndef CONFIG_HIGHMEM
1044                 /* Maximum memory usable is what is directly addressable */
1045                 printk(KERN_WARNING "Warning only %ldMB will be used.\n",
1046                                         MAXMEM>>20);
1047                 if (max_pfn > MAX_NONPAE_PFN)
1048                         printk(KERN_WARNING "Use a PAE enabled kernel.\n");
1049                 else
1050                         printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
1051                 max_pfn = MAXMEM_PFN;
1052 #else /* !CONFIG_HIGHMEM */
1053 #ifndef CONFIG_X86_PAE
1054                 if (max_pfn > MAX_NONPAE_PFN) {
1055                         max_pfn = MAX_NONPAE_PFN;
1056                         printk(KERN_WARNING "Warning only 4GB will be used.\n");
1057                         printk(KERN_WARNING "Use a PAE enabled kernel.\n");
1058                 }
1059 #endif /* !CONFIG_X86_PAE */
1060 #endif /* !CONFIG_HIGHMEM */
1061         } else {
1062                 if (highmem_pages == -1)
1063                         highmem_pages = 0;
1064 #ifdef CONFIG_HIGHMEM
1065                 if (highmem_pages >= max_pfn) {
1066                         printk(KERN_ERR "highmem size specified (%uMB) is bigger than pages available (%luMB)!.\n", pages_to_mb(highmem_pages), pages_to_mb(max_pfn));
1067                         highmem_pages = 0;
1068                 }
1069                 if (highmem_pages) {
1070                         if (max_low_pfn-highmem_pages < 64*1024*1024/PAGE_SIZE){
1071                                 printk(KERN_ERR "highmem size %uMB results in smaller than 64MB lowmem, ignoring it.\n", pages_to_mb(highmem_pages));
1072                                 highmem_pages = 0;
1073                         }
1074                         max_low_pfn -= highmem_pages;
1075                 }
1076 #else
1077                 if (highmem_pages)
1078                         printk(KERN_ERR "ignoring highmem size on non-highmem kernel!\n");
1079 #endif
1080         }
1081         return max_low_pfn;
1082 }
1083
1084 /*
1085  * Free all available memory for boot time allocation.  Used
1086  * as a callback function by efi_memory_walk()
1087  */
1088
1089 static int __init
1090 free_available_memory(unsigned long start, unsigned long end, void *arg)
1091 {
1092         /* check max_low_pfn */
1093         if (start >= (max_low_pfn << PAGE_SHIFT))
1094                 return 0;
1095         if (end >= (max_low_pfn << PAGE_SHIFT))
1096                 end = max_low_pfn << PAGE_SHIFT;
1097         if (start < end)
1098                 free_bootmem(start, end - start);
1099
1100         return 0;
1101 }
1102 /*
1103  * Register fully available low RAM pages with the bootmem allocator.
1104  */
1105 static void __init register_bootmem_low_pages(unsigned long max_low_pfn)
1106 {
1107         int i;
1108
1109         if (efi_enabled) {
1110                 efi_memmap_walk(free_available_memory, NULL);
1111                 return;
1112         }
1113         for (i = 0; i < e820.nr_map; i++) {
1114                 unsigned long curr_pfn, last_pfn, size;
1115                 /*
1116                  * Reserve usable low memory
1117                  */
1118                 if (e820.map[i].type != E820_RAM)
1119                         continue;
1120                 /*
1121                  * We are rounding up the start address of usable memory:
1122                  */
1123                 curr_pfn = PFN_UP(e820.map[i].addr);
1124                 if (curr_pfn >= max_low_pfn)
1125                         continue;
1126                 /*
1127                  * ... and at the end of the usable range downwards:
1128                  */
1129                 last_pfn = PFN_DOWN(e820.map[i].addr + e820.map[i].size);
1130
1131                 if (last_pfn > max_low_pfn)
1132                         last_pfn = max_low_pfn;
1133
1134                 /*
1135                  * .. finally, did all the rounding and playing
1136                  * around just make the area go away?
1137                  */
1138                 if (last_pfn <= curr_pfn)
1139                         continue;
1140
1141                 size = last_pfn - curr_pfn;
1142                 free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(size));
1143         }
1144 }
1145
1146 /*
1147  * workaround for Dell systems that neglect to reserve EBDA
1148  */
1149 static void __init reserve_ebda_region(void)
1150 {
1151         unsigned int addr;
1152         addr = get_bios_ebda();
1153         if (addr)
1154                 reserve_bootmem(addr, PAGE_SIZE);
1155 }
1156
1157 #ifndef CONFIG_NEED_MULTIPLE_NODES
1158 void __init setup_bootmem_allocator(void);
1159 static unsigned long __init setup_memory(void)
1160 {
1161         /*
1162          * partially used pages are not usable - thus
1163          * we are rounding upwards:
1164          */
1165         min_low_pfn = PFN_UP(init_pg_tables_end);
1166
1167         find_max_pfn();
1168
1169         max_low_pfn = find_max_low_pfn();
1170
1171 #ifdef CONFIG_HIGHMEM
1172         highstart_pfn = highend_pfn = max_pfn;
1173         if (max_pfn > max_low_pfn) {
1174                 highstart_pfn = max_low_pfn;
1175         }
1176         printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
1177                 pages_to_mb(highend_pfn - highstart_pfn));
1178 #endif
1179         printk(KERN_NOTICE "%ldMB LOWMEM available.\n",
1180                         pages_to_mb(max_low_pfn));
1181
1182         setup_bootmem_allocator();
1183
1184         return max_low_pfn;
1185 }
1186
1187 void __init zone_sizes_init(void)
1188 {
1189         unsigned long zones_size[MAX_NR_ZONES] = {0, 0, 0};
1190         unsigned int max_dma, low;
1191
1192         max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
1193         low = max_low_pfn;
1194
1195         if (low < max_dma)
1196                 zones_size[ZONE_DMA] = low;
1197         else {
1198                 zones_size[ZONE_DMA] = max_dma;
1199                 zones_size[ZONE_NORMAL] = low - max_dma;
1200 #ifdef CONFIG_HIGHMEM
1201                 zones_size[ZONE_HIGHMEM] = highend_pfn - low;
1202 #endif
1203         }
1204         free_area_init(zones_size);
1205 }
1206 #else
1207 extern unsigned long __init setup_memory(void);
1208 extern void zone_sizes_init(void);
1209 #endif /* !CONFIG_NEED_MULTIPLE_NODES */
1210
1211 void __init setup_bootmem_allocator(void)
1212 {
1213         unsigned long bootmap_size;
1214         /*
1215          * Initialize the boot-time allocator (with low memory only):
1216          */
1217         bootmap_size = init_bootmem(min_low_pfn, max_low_pfn);
1218
1219         register_bootmem_low_pages(max_low_pfn);
1220
1221         /*
1222          * Reserve the bootmem bitmap itself as well. We do this in two
1223          * steps (first step was init_bootmem()) because this catches
1224          * the (very unlikely) case of us accidentally initializing the
1225          * bootmem allocator with an invalid RAM area.
1226          */
1227         reserve_bootmem(__PHYSICAL_START, (PFN_PHYS(min_low_pfn) +
1228                          bootmap_size + PAGE_SIZE-1) - (__PHYSICAL_START));
1229
1230         /*
1231          * reserve physical page 0 - it's a special BIOS page on many boxes,
1232          * enabling clean reboots, SMP operation, laptop functions.
1233          */
1234         reserve_bootmem(0, PAGE_SIZE);
1235
1236         /* reserve EBDA region, it's a 4K region */
1237         reserve_ebda_region();
1238
1239     /* could be an AMD 768MPX chipset. Reserve a page  before VGA to prevent
1240        PCI prefetch into it (errata #56). Usually the page is reserved anyways,
1241        unless you have no PS/2 mouse plugged in. */
1242         if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
1243             boot_cpu_data.x86 == 6)
1244              reserve_bootmem(0xa0000 - 4096, 4096);
1245
1246 #ifdef CONFIG_SMP
1247         /*
1248          * But first pinch a few for the stack/trampoline stuff
1249          * FIXME: Don't need the extra page at 4K, but need to fix
1250          * trampoline before removing it. (see the GDT stuff)
1251          */
1252         reserve_bootmem(PAGE_SIZE, PAGE_SIZE);
1253 #endif
1254 #ifdef CONFIG_ACPI_SLEEP
1255         /*
1256          * Reserve low memory region for sleep support.
1257          */
1258         acpi_reserve_bootmem();
1259 #endif
1260 #ifdef CONFIG_X86_FIND_SMP_CONFIG
1261         /*
1262          * Find and reserve possible boot-time SMP configuration:
1263          */
1264         find_smp_config();
1265 #endif
1266
1267 #ifdef CONFIG_BLK_DEV_INITRD
1268         if (LOADER_TYPE && INITRD_START) {
1269                 if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
1270                         reserve_bootmem(INITRD_START, INITRD_SIZE);
1271                         initrd_start =
1272                                 INITRD_START ? INITRD_START + PAGE_OFFSET : 0;
1273                         initrd_end = initrd_start+INITRD_SIZE;
1274                 }
1275                 else {
1276                         printk(KERN_ERR "initrd extends beyond end of memory "
1277                             "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
1278                             INITRD_START + INITRD_SIZE,
1279                             max_low_pfn << PAGE_SHIFT);
1280                         initrd_start = 0;
1281                 }
1282         }
1283 #endif
1284 #ifdef CONFIG_KEXEC
1285         if (crashk_res.start != crashk_res.end)
1286                 reserve_bootmem(crashk_res.start,
1287                         crashk_res.end - crashk_res.start + 1);
1288 #endif
1289 }
1290
1291 /*
1292  * The node 0 pgdat is initialized before all of these because
1293  * it's needed for bootmem.  node>0 pgdats have their virtual
1294  * space allocated before the pagetables are in place to access
1295  * them, so they can't be cleared then.
1296  *
1297  * This should all compile down to nothing when NUMA is off.
1298  */
1299 void __init remapped_pgdat_init(void)
1300 {
1301         int nid;
1302
1303         for_each_online_node(nid) {
1304                 if (nid != 0)
1305                         memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
1306         }
1307 }
1308
1309 /*
1310  * Request address space for all standard RAM and ROM resources
1311  * and also for regions reported as reserved by the e820.
1312  */
1313 static void __init
1314 legacy_init_iomem_resources(struct resource *code_resource, struct resource *data_resource)
1315 {
1316         int i;
1317
1318         probe_roms();
1319         for (i = 0; i < e820.nr_map; i++) {
1320                 struct resource *res;
1321                 res = kzalloc(sizeof(struct resource), GFP_ATOMIC);
1322                 switch (e820.map[i].type) {
1323                 case E820_RAM:  res->name = "System RAM"; break;
1324                 case E820_ACPI: res->name = "ACPI Tables"; break;
1325                 case E820_NVS:  res->name = "ACPI Non-volatile Storage"; break;
1326                 default:        res->name = "reserved";
1327                 }
1328                 res->start = e820.map[i].addr;
1329                 res->end = res->start + e820.map[i].size - 1;
1330                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
1331                 request_resource(&iomem_resource, res);
1332                 if (e820.map[i].type == E820_RAM) {
1333                         /*
1334                          *  We don't know which RAM region contains kernel data,
1335                          *  so we try it repeatedly and let the resource manager
1336                          *  test it.
1337                          */
1338                         request_resource(res, code_resource);
1339                         request_resource(res, data_resource);
1340 #ifdef CONFIG_KEXEC
1341                         request_resource(res, &crashk_res);
1342 #endif
1343                 }
1344         }
1345 }
1346
1347 /*
1348  * Request address space for all standard resources
1349  *
1350  * This is called just before pcibios_init(), which is also a
1351  * subsys_initcall, but is linked in later (in arch/i386/pci/common.c).
1352  */
1353 static int __init request_standard_resources(void)
1354 {
1355         int i;
1356
1357         printk("Setting up standard PCI resources\n");
1358         if (efi_enabled)
1359                 efi_initialize_iomem_resources(&code_resource, &data_resource);
1360         else
1361                 legacy_init_iomem_resources(&code_resource, &data_resource);
1362
1363         /* EFI systems may still have VGA */
1364         request_resource(&iomem_resource, &video_ram_resource);
1365
1366         /* request I/O space for devices used on all i[345]86 PCs */
1367         for (i = 0; i < STANDARD_IO_RESOURCES; i++)
1368                 request_resource(&ioport_resource, &standard_io_resources[i]);
1369         return 0;
1370 }
1371
1372 subsys_initcall(request_standard_resources);
1373
1374 static void __init register_memory(void)
1375 {
1376         unsigned long gapstart, gapsize, round;
1377         unsigned long long last;
1378         int i;
1379
1380         /*
1381          * Search for the bigest gap in the low 32 bits of the e820
1382          * memory space.
1383          */
1384         last = 0x100000000ull;
1385         gapstart = 0x10000000;
1386         gapsize = 0x400000;
1387         i = e820.nr_map;
1388         while (--i >= 0) {
1389                 unsigned long long start = e820.map[i].addr;
1390                 unsigned long long end = start + e820.map[i].size;
1391
1392                 /*
1393                  * Since "last" is at most 4GB, we know we'll
1394                  * fit in 32 bits if this condition is true
1395                  */
1396                 if (last > end) {
1397                         unsigned long gap = last - end;
1398
1399                         if (gap > gapsize) {
1400                                 gapsize = gap;
1401                                 gapstart = end;
1402                         }
1403                 }
1404                 if (start < last)
1405                         last = start;
1406         }
1407
1408         /*
1409          * See how much we want to round up: start off with
1410          * rounding to the next 1MB area.
1411          */
1412         round = 0x100000;
1413         while ((gapsize >> 4) > round)
1414                 round += round;
1415         /* Fun with two's complement */
1416         pci_mem_start = (gapstart + round) & -round;
1417
1418         printk("Allocating PCI resources starting at %08lx (gap: %08lx:%08lx)\n",
1419                 pci_mem_start, gapstart, gapsize);
1420 }
1421
1422 static char * __init machine_specific_memory_setup(void);
1423
1424 #ifdef CONFIG_MCA
1425 static void set_mca_bus(int x)
1426 {
1427         MCA_bus = x;
1428 }
1429 #else
1430 static void set_mca_bus(int x) { }
1431 #endif
1432
1433 /*
1434  * Determine if we were loaded by an EFI loader.  If so, then we have also been
1435  * passed the efi memmap, systab, etc., so we should use these data structures
1436  * for initialization.  Note, the efi init code path is determined by the
1437  * global efi_enabled. This allows the same kernel image to be used on existing
1438  * systems (with a traditional BIOS) as well as on EFI systems.
1439  */
1440 void __init setup_arch(char **cmdline_p)
1441 {
1442         unsigned long max_low_pfn;
1443
1444         memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
1445         pre_setup_arch_hook();
1446         early_cpu_init();
1447
1448         /*
1449          * FIXME: This isn't an official loader_type right
1450          * now but does currently work with elilo.
1451          * If we were configured as an EFI kernel, check to make
1452          * sure that we were loaded correctly from elilo and that
1453          * the system table is valid.  If not, then initialize normally.
1454          */
1455 #ifdef CONFIG_EFI
1456         if ((LOADER_TYPE == 0x50) && EFI_SYSTAB)
1457                 efi_enabled = 1;
1458 #endif
1459
1460         ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
1461         drive_info = DRIVE_INFO;
1462         screen_info = SCREEN_INFO;
1463         edid_info = EDID_INFO;
1464         apm_info.bios = APM_BIOS_INFO;
1465         ist_info = IST_INFO;
1466         saved_videomode = VIDEO_MODE;
1467         if( SYS_DESC_TABLE.length != 0 ) {
1468                 set_mca_bus(SYS_DESC_TABLE.table[3] & 0x2);
1469                 machine_id = SYS_DESC_TABLE.table[0];
1470                 machine_submodel_id = SYS_DESC_TABLE.table[1];
1471                 BIOS_revision = SYS_DESC_TABLE.table[2];
1472         }
1473         bootloader_type = LOADER_TYPE;
1474
1475 #ifdef CONFIG_BLK_DEV_RAM
1476         rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
1477         rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
1478         rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
1479 #endif
1480         ARCH_SETUP
1481         if (efi_enabled)
1482                 efi_init();
1483         else {
1484                 printk(KERN_INFO "BIOS-provided physical RAM map:\n");
1485                 print_memory_map(machine_specific_memory_setup());
1486         }
1487
1488         copy_edd();
1489
1490         if (!MOUNT_ROOT_RDONLY)
1491                 root_mountflags &= ~MS_RDONLY;
1492         init_mm.start_code = (unsigned long) _text;
1493         init_mm.end_code = (unsigned long) _etext;
1494         init_mm.end_data = (unsigned long) _edata;
1495         init_mm.brk = init_pg_tables_end + PAGE_OFFSET;
1496
1497         code_resource.start = virt_to_phys(_text);
1498         code_resource.end = virt_to_phys(_etext)-1;
1499         data_resource.start = virt_to_phys(_etext);
1500         data_resource.end = virt_to_phys(_edata)-1;
1501
1502         parse_cmdline_early(cmdline_p);
1503
1504 #ifdef CONFIG_EARLY_PRINTK
1505         {
1506                 char *s = strstr(*cmdline_p, "earlyprintk=");
1507                 if (s) {
1508                         setup_early_printk(strchr(s, '=') + 1);
1509                         printk("early console enabled\n");
1510                 }
1511         }
1512 #endif
1513
1514         max_low_pfn = setup_memory();
1515
1516         /*
1517          * NOTE: before this point _nobody_ is allowed to allocate
1518          * any memory using the bootmem allocator.  Although the
1519          * alloctor is now initialised only the first 8Mb of the kernel
1520          * virtual address space has been mapped.  All allocations before
1521          * paging_init() has completed must use the alloc_bootmem_low_pages()
1522          * variant (which allocates DMA'able memory) and care must be taken
1523          * not to exceed the 8Mb limit.
1524          */
1525
1526 #ifdef CONFIG_SMP
1527         smp_alloc_memory(); /* AP processor realmode stacks in low memory*/
1528 #endif
1529         paging_init();
1530         remapped_pgdat_init();
1531         sparse_init();
1532         zone_sizes_init();
1533
1534         /*
1535          * NOTE: at this point the bootmem allocator is fully available.
1536          */
1537
1538         dmi_scan_machine();
1539
1540 #ifdef CONFIG_X86_GENERICARCH
1541         generic_apic_probe(*cmdline_p);
1542 #endif
1543         if (efi_enabled)
1544                 efi_map_memmap();
1545
1546 #ifdef CONFIG_X86_IO_APIC
1547         check_acpi_pci();       /* Checks more than just ACPI actually */
1548 #endif
1549
1550 #ifdef CONFIG_ACPI
1551         /*
1552          * Parse the ACPI tables for possible boot-time SMP configuration.
1553          */
1554         acpi_boot_table_init();
1555         acpi_boot_init();
1556
1557 #if defined(CONFIG_SMP) && defined(CONFIG_X86_PC)
1558         if (def_to_bigsmp)
1559                 printk(KERN_WARNING "More than 8 CPUs detected and "
1560                         "CONFIG_X86_PC cannot handle it.\nUse "
1561                         "CONFIG_X86_GENERICARCH or CONFIG_X86_BIGSMP.\n");
1562 #endif
1563 #endif
1564 #ifdef CONFIG_X86_LOCAL_APIC
1565         if (smp_found_config)
1566                 get_smp_config();
1567 #endif
1568
1569         register_memory();
1570
1571 #ifdef CONFIG_VT
1572 #if defined(CONFIG_VGA_CONSOLE)
1573         if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
1574                 conswitchp = &vga_con;
1575 #elif defined(CONFIG_DUMMY_CONSOLE)
1576         conswitchp = &dummy_con;
1577 #endif
1578 #endif
1579 }
1580
1581 static __init int add_pcspkr(void)
1582 {
1583         struct platform_device *pd;
1584         int ret;
1585
1586         pd = platform_device_alloc("pcspkr", -1);
1587         if (!pd)
1588                 return -ENOMEM;
1589
1590         ret = platform_device_add(pd);
1591         if (ret)
1592                 platform_device_put(pd);
1593
1594         return ret;
1595 }
1596 device_initcall(add_pcspkr);
1597
1598 #include "setup_arch_post.h"
1599 /*
1600  * Local Variables:
1601  * mode:c
1602  * c-file-style:"k&r"
1603  * c-basic-offset:8
1604  * End:
1605  */