kernel/linux/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/sched.h>
  27 #include <linux/mm.h>
  28 #include <linux/tty.h>
  29 #include <linux/ioport.h>
  30 #include <linux/acpi.h>
  31 #include <linux/apm_bios.h>
  32 #include <linux/initrd.h>
  33 #include <linux/bootmem.h>
  34 #include <linux/seq_file.h>
  35 #include <linux/console.h>
  36 #include <linux/root_dev.h>
  37 #include <linux/highmem.h>
  38 #include <linux/module.h>
  39 #include <linux/efi.h>
  40 #include <linux/init.h>
  41 #include <linux/edd.h>
  42 #include <video/edid.h>
  43 #include <asm/e820.h>
  44 #include <asm/mpspec.h>
  45 #include <asm/setup.h>
  46 #include <asm/arch_hooks.h>
  47 #include <asm/sections.h>
  48 #include <asm/io_apic.h>
  49 #include <asm/ist.h>
  50 #include <asm/io.h>
  51 #include "setup_arch_pre.h"
  52
  53 /* This value is set up by the early boot code to point to the value
  54    immediately after the boot time page tables.  It contains a *physical*
  55    address, and must not be in the .bss segment! */
  56 unsigned long init_pg_tables_end __initdata = ~0UL;
  57
  58 int disable_pse __initdata = 0;
  59
  60 /*
  61  * Machine setup..
  62  */
  63
  64 #ifdef CONFIG_EFI
  65 int efi_enabled = 0;
  66 EXPORT_SYMBOL(efi_enabled);
  67 #endif
  68
  69 /* cpu data as detected by the assembly code in head.S */
  70 struct cpuinfo_x86 new_cpu_data __initdata = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
  71 /* common cpu data for all cpus */
  72 struct cpuinfo_x86 boot_cpu_data = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
  73
  74 unsigned long mmu_cr4_features;
  75 EXPORT_SYMBOL_GPL(mmu_cr4_features);
  76
  77 #ifdef  CONFIG_ACPI_INTERPRETER
  78         int acpi_disabled = 0;
  79 #else
  80         int acpi_disabled = 1;
  81 #endif
  82 EXPORT_SYMBOL(acpi_disabled);
  83
  84 #ifdef  CONFIG_ACPI_BOOT
  85 int __initdata acpi_force = 0;
  86 extern acpi_interrupt_flags     acpi_sci_flags;
  87 #endif
  88
  89 int MCA_bus;
  90 /* for MCA, but anyone else can use it if they want */
  91 unsigned int machine_id;
  92 unsigned int machine_submodel_id;
  93 unsigned int BIOS_revision;
  94 unsigned int mca_pentium_flag;
  95
  96 /* For PCI or other memory-mapped resources */
  97 unsigned long pci_mem_start = 0x10000000;
  98
  99 /* user-defined highmem size */
 100 static unsigned int highmem_pages = -1;
 101
 102 /*
 103  * Setup options
 104  */
 105 struct drive_info_struct { char dummy[32]; } drive_info;
 106 struct screen_info screen_info;
 107 struct apm_info apm_info;
 108 struct sys_desc_table_struct {
 109         unsigned short length;
 110         unsigned char table[0];
 111 };
 112 struct edid_info edid_info;
 113 struct ist_info ist_info;
 114 struct e820map e820;
 115
 116 unsigned char aux_device_present;
 117
 118 extern void early_cpu_init(void);
 119 extern void dmi_scan_machine(void);
 120 extern void generic_apic_probe(char *);
 121 extern int root_mountflags;
 122
 123 unsigned long saved_videomode;
 124
 125 #define RAMDISK_IMAGE_START_MASK        0x07FF
 126 #define RAMDISK_PROMPT_FLAG             0x8000
 127 #define RAMDISK_LOAD_FLAG               0x4000
 128
 129 static char command_line[COMMAND_LINE_SIZE];
 130
 131 unsigned char __initdata boot_params[PARAM_SIZE];
 132
 133 static struct resource data_resource = {
 134         .name   = "Kernel data",
 135         .start  = 0,
 136         .end    = 0,
 137         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 138 };
 139
 140 static struct resource code_resource = {
 141         .name   = "Kernel code",
 142         .start  = 0,
 143         .end    = 0,
 144         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 145 };
 146
 147 static struct resource system_rom_resource = {
 148         .name   = "System ROM",
 149         .start  = 0xf0000,
 150         .end    = 0xfffff,
 151         .flags  = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
 152 };
 153
 154 static struct resource extension_rom_resource = {
 155         .name   = "Extension ROM",
 156         .start  = 0xe0000,
 157         .end    = 0xeffff,
 158         .flags  = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
 159 };
 160
 161 static struct resource adapter_rom_resources[] = { {
 162         .name   = "Adapter ROM",
 163         .start  = 0xc8000,
 164         .end    = 0,
 165         .flags  = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
 166 }, {
 167         .name   = "Adapter ROM",
 168         .start  = 0,
 169         .end    = 0,
 170         .flags  = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
 171 }, {
 172         .name   = "Adapter ROM",
 173         .start  = 0,
 174         .end    = 0,
 175         .flags  = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
 176 }, {
 177         .name   = "Adapter ROM",
 178         .start  = 0,
 179         .end    = 0,
 180         .flags  = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
 181 }, {
 182         .name   = "Adapter ROM",
 183         .start  = 0,
 184         .end    = 0,
 185         .flags  = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
 186 }, {
 187         .name   = "Adapter ROM",
 188         .start  = 0,
 189         .end    = 0,
 190         .flags  = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
 191 } };
 192
 193 #define ADAPTER_ROM_RESOURCES \
 194         (sizeof adapter_rom_resources / sizeof adapter_rom_resources[0])
 195
 196 static struct resource video_rom_resource = {
 197         .name   = "Video ROM",
 198         .start  = 0xc0000,
 199         .end    = 0xc7fff,
 200         .flags  = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
 201 };
 202
 203 static struct resource video_ram_resource = {
 204         .name   = "Video RAM area",
 205         .start  = 0xa0000,
 206         .end    = 0xbffff,
 207         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 208 };
 209
 210 static struct resource standard_io_resources[] = { {
 211         .name   = "dma1",
 212         .start  = 0x0000,
 213         .end    = 0x001f,
 214         .flags  = IORESOURCE_BUSY | IORESOURCE_IO
 215 }, {
 216         .name   = "pic1",
 217         .start  = 0x0020,
 218         .end    = 0x0021,
 219         .flags  = IORESOURCE_BUSY | IORESOURCE_IO
 220 }, {
 221         .name   = "timer",
 222         .start  = 0x0040,
 223         .end    = 0x005f,
 224         .flags  = IORESOURCE_BUSY | IORESOURCE_IO
 225 }, {
 226         .name   = "keyboard",
 227         .start  = 0x0060,
 228         .end    = 0x006f,
 229         .flags  = IORESOURCE_BUSY | IORESOURCE_IO
 230 }, {
 231         .name   = "dma page reg",
 232         .start  = 0x0080,
 233         .end    = 0x008f,
 234         .flags  = IORESOURCE_BUSY | IORESOURCE_IO
 235 }, {
 236         .name   = "pic2",
 237         .start  = 0x00a0,
 238         .end    = 0x00a1,
 239         .flags  = IORESOURCE_BUSY | IORESOURCE_IO
 240 }, {
 241         .name   = "dma2",
 242         .start  = 0x00c0,
 243         .end    = 0x00df,
 244         .flags  = IORESOURCE_BUSY | IORESOURCE_IO
 245 }, {
 246         .name   = "fpu",
 247         .start  = 0x00f0,
 248         .end    = 0x00ff,
 249         .flags  = IORESOURCE_BUSY | IORESOURCE_IO
 250 } };
 251
 252 #define STANDARD_IO_RESOURCES \
 253         (sizeof standard_io_resources / sizeof standard_io_resources[0])
 254
 255 #define romsignature(x) (*(unsigned short *)(x) == 0xaa55)
 256
 257 static int __init romchecksum(unsigned char *rom, unsigned long length)
 258 {
 259         unsigned char *p, sum = 0;
 260
 261         for (p = rom; p < rom + length; p++)
 262                 sum += *p;
 263         return sum == 0;
 264 }
 265
 266 static void __init probe_roms(void)
 267 {
 268         unsigned long start, length, upper;
 269         unsigned char *rom;
 270         int           i;
 271
 272         /* video rom */
 273         upper = adapter_rom_resources[0].start;
 274         for (start = video_rom_resource.start; start < upper; start += 2048) {
 275                 rom = isa_bus_to_virt(start);
 276                 if (!romsignature(rom))
 277                         continue;
 278
 279                 video_rom_resource.start = start;
 280
 281                 /* 0 < length <= 0x7f * 512, historically */
 282                 length = rom[2] * 512;
 283
 284                 /* if checksum okay, trust length byte */
 285                 if (length && romchecksum(rom, length))
 286                         video_rom_resource.end = start + length - 1;
 287
 288                 request_resource(&iomem_resource, &video_rom_resource);
 289                 break;
 290         }
 291
 292         start = (video_rom_resource.end + 1 + 2047) & ~2047UL;
 293         if (start < upper)
 294                 start = upper;
 295
 296         /* system rom */
 297         request_resource(&iomem_resource, &system_rom_resource);
 298         upper = system_rom_resource.start;
 299
 300         /* check for extension rom (ignore length byte!) */
 301         rom = isa_bus_to_virt(extension_rom_resource.start);
 302         if (romsignature(rom)) {
 303                 length = extension_rom_resource.end - extension_rom_resource.start + 1;
 304                 if (romchecksum(rom, length)) {
 305                         request_resource(&iomem_resource, &extension_rom_resource);
 306                         upper = extension_rom_resource.start;
 307                 }
 308         }
 309
 310         /* check for adapter roms on 2k boundaries */
 311         for (i = 0; i < ADAPTER_ROM_RESOURCES && start < upper; start += 2048) {
 312                 rom = isa_bus_to_virt(start);
 313                 if (!romsignature(rom))
 314                         continue;
 315
 316                 /* 0 < length <= 0x7f * 512, historically */
 317                 length = rom[2] * 512;
 318
 319                 /* but accept any length that fits if checksum okay */
 320                 if (!length || start + length > upper || !romchecksum(rom, length))
 321                         continue;
 322
 323                 adapter_rom_resources[i].start = start;
 324                 adapter_rom_resources[i].end = start + length - 1;
 325                 request_resource(&iomem_resource, &adapter_rom_resources[i]);
 326
 327                 start = adapter_rom_resources[i++].end & ~2047UL;
 328         }
 329 }
 330
 331 static void __init limit_regions(unsigned long long size)
 332 {
 333         unsigned long long current_addr = 0;
 334         int i;
 335
 336         if (efi_enabled) {
 337                 for (i = 0; i < memmap.nr_map; i++) {
 338                         current_addr = memmap.map[i].phys_addr +
 339                                        (memmap.map[i].num_pages << 12);
 340                         if (memmap.map[i].type == EFI_CONVENTIONAL_MEMORY) {
 341                                 if (current_addr >= size) {
 342                                         memmap.map[i].num_pages -=
 343                                                 (((current_addr-size) + PAGE_SIZE-1) >> PAGE_SHIFT);
 344                                         memmap.nr_map = i + 1;
 345                                         return;
 346                                 }
 347                         }
 348                 }
 349         }
 350         for (i = 0; i < e820.nr_map; i++) {
 351                 if (e820.map[i].type == E820_RAM) {
 352                         current_addr = e820.map[i].addr + e820.map[i].size;
 353                         if (current_addr >= size) {
 354                                 e820.map[i].size -= current_addr-size;
 355                                 e820.nr_map = i + 1;
 356                                 return;
 357                         }
 358                 }
 359         }
 360 }
 361
 362 static void __init add_memory_region(unsigned long long start,
 363                                   unsigned long long size, int type)
 364 {
 365         int x;
 366
 367         if (!efi_enabled) {
 368                 x = e820.nr_map;
 369
 370                 if (x == E820MAX) {
 371                     printk(KERN_ERR "Ooops! Too many entries in the memory map!\n");
 372                     return;
 373                 }
 374
 375                 e820.map[x].addr = start;
 376                 e820.map[x].size = size;
 377                 e820.map[x].type = type;
 378                 e820.nr_map++;
 379         }
 380 } /* add_memory_region */
 381
 382 #define E820_DEBUG      1
 383
 384 static void __init print_memory_map(char *who)
 385 {
 386         int i;
 387
 388         for (i = 0; i < e820.nr_map; i++) {
 389                 printk(" %s: %016Lx - %016Lx ", who,
 390                         e820.map[i].addr,
 391                         e820.map[i].addr + e820.map[i].size);
 392                 switch (e820.map[i].type) {
 393                 case E820_RAM:  printk("(usable)\n");
 394                                 break;
 395                 case E820_RESERVED:
 396                                 printk("(reserved)\n");
 397                                 break;
 398                 case E820_ACPI:
 399                                 printk("(ACPI data)\n");
 400                                 break;
 401                 case E820_NVS:
 402                                 printk("(ACPI NVS)\n");
 403                                 break;
 404                 default:        printk("type %lu\n", e820.map[i].type);
 405                                 break;
 406                 }
 407         }
 408 }
 409
 410 /*
 411  * Sanitize the BIOS e820 map.
 412  *
 413  * Some e820 responses include overlapping entries.  The following
 414  * replaces the original e820 map with a new one, removing overlaps.
 415  *
 416  */
 417 struct change_member {
 418         struct e820entry *pbios; /* pointer to original bios entry */
 419         unsigned long long addr; /* address for this change point */
 420 };
 421 struct change_member change_point_list[2*E820MAX] __initdata;
 422 struct change_member *change_point[2*E820MAX] __initdata;
 423 struct e820entry *overlap_list[E820MAX] __initdata;
 424 struct e820entry new_bios[E820MAX] __initdata;
 425
 426 static int __init sanitize_e820_map(struct e820entry * biosmap, char * pnr_map)
 427 {
 428         struct change_member *change_tmp;
 429         unsigned long current_type, last_type;
 430         unsigned long long last_addr;
 431         int chgidx, still_changing;
 432         int overlap_entries;
 433         int new_bios_entry;
 434         int old_nr, new_nr, chg_nr;
 435         int i;
 436
 437         /*
 438                 Visually we're performing the following (1,2,3,4 = memory types)...
 439
 440                 Sample memory map (w/overlaps):
 441                    ____22__________________
 442                    ______________________4_
 443                    ____1111________________
 444                    _44_____________________
 445                    11111111________________
 446                    ____________________33__
 447                    ___________44___________
 448                    __________33333_________
 449                    ______________22________
 450                    ___________________2222_
 451                    _________111111111______
 452                    _____________________11_
 453                    _________________4______
 454
 455                 Sanitized equivalent (no overlap):
 456                    1_______________________
 457                    _44_____________________
 458                    ___1____________________
 459                    ____22__________________
 460                    ______11________________
 461                    _________1______________
 462                    __________3_____________
 463                    ___________44___________
 464                    _____________33_________
 465                    _______________2________
 466                    ________________1_______
 467                    _________________4______
 468                    ___________________2____
 469                    ____________________33__
 470                    ______________________4_
 471         */
 472
 473         /* if there's only one memory region, don't bother */
 474         if (*pnr_map < 2)
 475                 return -1;
 476
 477         old_nr = *pnr_map;
 478
 479         /* bail out if we find any unreasonable addresses in bios map */
 480         for (i=0; i<old_nr; i++)
 481                 if (biosmap[i].addr + biosmap[i].size < biosmap[i].addr)
 482                         return -1;
 483
 484         /* create pointers for initial change-point information (for sorting) */
 485         for (i=0; i < 2*old_nr; i++)
 486                 change_point[i] = &change_point_list[i];
 487
 488         /* record all known change-points (starting and ending addresses),
 489            omitting those that are for empty memory regions */
 490         chgidx = 0;
 491         for (i=0; i < old_nr; i++)      {
 492                 if (biosmap[i].size != 0) {
 493                         change_point[chgidx]->addr = biosmap[i].addr;
 494                         change_point[chgidx++]->pbios = &biosmap[i];
 495                         change_point[chgidx]->addr = biosmap[i].addr + biosmap[i].size;
 496                         change_point[chgidx++]->pbios = &biosmap[i];
 497                 }
 498         }
 499         chg_nr = chgidx;        /* true number of change-points */
 500
 501         /* sort change-point list by memory addresses (low -> high) */
 502         still_changing = 1;
 503         while (still_changing)  {
 504                 still_changing = 0;
 505                 for (i=1; i < chg_nr; i++)  {
 506                         /* if <current_addr> > <last_addr>, swap */
 507                         /* or, if current=<start_addr> & last=<end_addr>, swap */
 508                         if ((change_point[i]->addr < change_point[i-1]->addr) ||
 509                                 ((change_point[i]->addr == change_point[i-1]->addr) &&
 510                                  (change_point[i]->addr == change_point[i]->pbios->addr) &&
 511                                  (change_point[i-1]->addr != change_point[i-1]->pbios->addr))
 512                            )
 513                         {
 514                                 change_tmp = change_point[i];
 515                                 change_point[i] = change_point[i-1];
 516                                 change_point[i-1] = change_tmp;
 517                                 still_changing=1;
 518                         }
 519                 }
 520         }
 521
 522         /* create a new bios memory map, removing overlaps */
 523         overlap_entries=0;       /* number of entries in the overlap table */
 524         new_bios_entry=0;        /* index for creating new bios map entries */
 525         last_type = 0;           /* start with undefined memory type */
 526         last_addr = 0;           /* start with 0 as last starting address */
 527         /* loop through change-points, determining affect on the new bios map */
 528         for (chgidx=0; chgidx < chg_nr; chgidx++)
 529         {
 530                 /* keep track of all overlapping bios entries */
 531                 if (change_point[chgidx]->addr == change_point[chgidx]->pbios->addr)
 532                 {
 533                         /* add map entry to overlap list (> 1 entry implies an overlap) */
 534                         overlap_list[overlap_entries++]=change_point[chgidx]->pbios;
 535                 }
 536                 else
 537                 {
 538                         /* remove entry from list (order independent, so swap with last) */
 539                         for (i=0; i<overlap_entries; i++)
 540                         {
 541                                 if (overlap_list[i] == change_point[chgidx]->pbios)
 542                                         overlap_list[i] = overlap_list[overlap_entries-1];
 543                         }
 544                         overlap_entries--;
 545                 }
 546                 /* if there are overlapping entries, decide which "type" to use */
 547                 /* (larger value takes precedence -- 1=usable, 2,3,4,4+=unusable) */
 548                 current_type = 0;
 549                 for (i=0; i<overlap_entries; i++)
 550                         if (overlap_list[i]->type > current_type)
 551                                 current_type = overlap_list[i]->type;
 552                 /* continue building up new bios map based on this information */
 553                 if (current_type != last_type)  {
 554                         if (last_type != 0)      {
 555                                 new_bios[new_bios_entry].size =
 556                                         change_point[chgidx]->addr - last_addr;
 557                                 /* move forward only if the new size was non-zero */
 558                                 if (new_bios[new_bios_entry].size != 0)
 559                                         if (++new_bios_entry >= E820MAX)
 560                                                 break;  /* no more space left for new bios entries */
 561                         }
 562                         if (current_type != 0)  {
 563                                 new_bios[new_bios_entry].addr = change_point[chgidx]->addr;
 564                                 new_bios[new_bios_entry].type = current_type;
 565                                 last_addr=change_point[chgidx]->addr;
 566                         }
 567                         last_type = current_type;
 568                 }
 569         }
 570         new_nr = new_bios_entry;   /* retain count for new bios entries */
 571
 572         /* copy new bios mapping into original location */
 573         memcpy(biosmap, new_bios, new_nr*sizeof(struct e820entry));
 574         *pnr_map = new_nr;
 575
 576         return 0;
 577 }
 578
 579 /*
 580  * Copy the BIOS e820 map into a safe place.
 581  *
 582  * Sanity-check it while we're at it..
 583  *
 584  * If we're lucky and live on a modern system, the setup code
 585  * will have given us a memory map that we can use to properly
 586  * set up memory.  If we aren't, we'll fake a memory map.
 587  *
 588  * We check to see that the memory map contains at least 2 elements
 589  * before we'll use it, because the detection code in setup.S may
 590  * not be perfect and most every PC known to man has two memory
 591  * regions: one from 0 to 640k, and one from 1mb up.  (The IBM
 592  * thinkpad 560x, for example, does not cooperate with the memory
 593  * detection code.)
 594  */
 595 static int __init copy_e820_map(struct e820entry * biosmap, int nr_map)
 596 {
 597         /* Only one memory region (or negative)? Ignore it */
 598         if (nr_map < 2)
 599                 return -1;
 600
 601         do {
 602                 unsigned long long start = biosmap->addr;
 603                 unsigned long long size = biosmap->size;
 604                 unsigned long long end = start + size;
 605                 unsigned long type = biosmap->type;
 606
 607                 /* Overflow in 64 bits? Ignore the memory map. */
 608                 if (start > end)
 609                         return -1;
 610
 611                 /*
 612                  * Some BIOSes claim RAM in the 640k - 1M region.
 613                  * Not right. Fix it up.
 614                  */
 615                 if (type == E820_RAM) {
 616                         if (start < 0x100000ULL && end > 0xA0000ULL) {
 617                                 if (start < 0xA0000ULL)
 618                                         add_memory_region(start, 0xA0000ULL-start, type);
 619                                 if (end <= 0x100000ULL)
 620                                         continue;
 621                                 start = 0x100000ULL;
 622                                 size = end - start;
 623                         }
 624                 }
 625                 add_memory_region(start, size, type);
 626         } while (biosmap++,--nr_map);
 627         return 0;
 628 }
 629
 630 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
 631 struct edd edd;
 632 #ifdef CONFIG_EDD_MODULE
 633 EXPORT_SYMBOL(edd);
 634 #endif
 635 /**
 636  * copy_edd() - Copy the BIOS EDD information
 637  *              from boot_params into a safe place.
 638  *
 639  */
 640 static inline void copy_edd(void)
 641 {
 642      memcpy(edd.mbr_signature, EDD_MBR_SIGNATURE, sizeof(edd.mbr_signature));
 643      memcpy(edd.edd_info, EDD_BUF, sizeof(edd.edd_info));
 644      edd.mbr_signature_nr = EDD_MBR_SIG_NR;
 645      edd.edd_info_nr = EDD_NR;
 646 }
 647 #else
 648 static inline void copy_edd(void)
 649 {
 650 }
 651 #endif
 652
 653 /*
 654  * Do NOT EVER look at the BIOS memory size location.
 655  * It does not work on many machines.
 656  */
 657 #define LOWMEMSIZE()    (0x9f000)
 658
 659 static void __init parse_cmdline_early (char ** cmdline_p)
 660 {
 661         char c = ' ', *to = command_line, *from = saved_command_line;
 662         int len = 0;
 663         int userdef = 0;
 664
 665         /* Save unparsed command line copy for /proc/cmdline */
 666         saved_command_line[COMMAND_LINE_SIZE-1] = '\0';
 667
 668         for (;;) {
 669                 /*
 670                  * "mem=nopentium" disables the 4MB page tables.
 671                  * "mem=XXX[kKmM]" defines a memory region from HIGH_MEM
 672                  * to <mem>, overriding the bios size.
 673                  * "memmap=XXX[KkmM]@XXX[KkmM]" defines a memory region from
 674                  * <start> to <start>+<mem>, overriding the bios size.
 675                  *
 676                  * HPA tells me bootloaders need to parse mem=, so no new
 677                  * option should be mem=  [also see Documentation/i386/boot.txt]
 678                  */
 679                 if (c == ' ' && !memcmp(from, "mem=", 4)) {
 680                         if (to != command_line)
 681                                 to--;
 682                         if (!memcmp(from+4, "nopentium", 9)) {
 683                                 from += 9+4;
 684                                 clear_bit(X86_FEATURE_PSE, boot_cpu_data.x86_capability);
 685                                 disable_pse = 1;
 686                         } else {
 687                                 /* If the user specifies memory size, we
 688                                  * limit the BIOS-provided memory map to
 689                                  * that size. exactmap can be used to specify
 690                                  * the exact map. mem=number can be used to
 691                                  * trim the existing memory map.
 692                                  */
 693                                 unsigned long long mem_size;
 694
 695                                 mem_size = memparse(from+4, &from);
 696                                 limit_regions(mem_size);
 697                                 userdef=1;
 698                         }
 699                 }
 700
 701                 if (c == ' ' && !memcmp(from, "memmap=", 7)) {
 702                         if (to != command_line)
 703                                 to--;
 704                         if (!memcmp(from+7, "exactmap", 8)) {
 705                                 from += 8+7;
 706                                 e820.nr_map = 0;
 707                                 userdef = 1;
 708                         } else {
 709                                 /* If the user specifies memory size, we
 710                                  * limit the BIOS-provided memory map to
 711                                  * that size. exactmap can be used to specify
 712                                  * the exact map. mem=number can be used to
 713                                  * trim the existing memory map.
 714                                  */
 715                                 unsigned long long start_at, mem_size;
 716
 717                                 mem_size = memparse(from+7, &from);
 718                                 if (*from == '@') {
 719                                         start_at = memparse(from+1, &from);
 720                                         add_memory_region(start_at, mem_size, E820_RAM);
 721                                 } else if (*from == '#') {
 722                                         start_at = memparse(from+1, &from);
 723                                         add_memory_region(start_at, mem_size, E820_ACPI);
 724                                 } else if (*from == '$') {
 725                                         start_at = memparse(from+1, &from);
 726                                         add_memory_region(start_at, mem_size, E820_RESERVED);
 727                                 } else {
 728                                         limit_regions(mem_size);
 729                                         userdef=1;
 730                                 }
 731                         }
 732                 }
 733
 734 #ifdef  CONFIG_X86_SMP
 735                 /*
 736                  * If the BIOS enumerates physical processors before logical,
 737                  * maxcpus=N at enumeration-time can be used to disable HT.
 738                  */
 739                 else if (!memcmp(from, "maxcpus=", 8)) {
 740                         extern unsigned int maxcpus;
 741
 742                         maxcpus = simple_strtoul(from + 8, NULL, 0);
 743                 }
 744 #endif
 745
 746 #ifdef CONFIG_ACPI_BOOT
 747                 /* "acpi=off" disables both ACPI table parsing and interpreter */
 748                 else if (!memcmp(from, "acpi=off", 8)) {
 749                         disable_acpi();
 750                 }
 751
 752                 /* acpi=force to over-ride black-list */
 753                 else if (!memcmp(from, "acpi=force", 10)) {
 754                         acpi_force = 1;
 755                         acpi_ht = 1;
 756                         acpi_disabled = 0;
 757                 }
 758
 759                 /* acpi=strict disables out-of-spec workarounds */
 760                 else if (!memcmp(from, "acpi=strict", 11)) {
 761                         acpi_strict = 1;
 762                 }
 763
 764                 /* Limit ACPI just to boot-time to enable HT */
 765                 else if (!memcmp(from, "acpi=ht", 7)) {
 766                         if (!acpi_force)
 767                                 disable_acpi();
 768                         acpi_ht = 1;
 769                 }
 770
 771                 /* "pci=noacpi" disable ACPI IRQ routing and PCI scan */
 772                 else if (!memcmp(from, "pci=noacpi", 10)) {
 773                         acpi_disable_pci();
 774                 }
 775                 /* "acpi=noirq" disables ACPI interrupt routing */
 776                 else if (!memcmp(from, "acpi=noirq", 10)) {
 777                         acpi_noirq_set();
 778                 }
 779
 780                 else if (!memcmp(from, "acpi_sci=edge", 13))
 781                         acpi_sci_flags.trigger =  1;
 782
 783                 else if (!memcmp(from, "acpi_sci=level", 14))
 784                         acpi_sci_flags.trigger = 3;
 785
 786                 else if (!memcmp(from, "acpi_sci=high", 13))
 787                         acpi_sci_flags.polarity = 1;
 788
 789                 else if (!memcmp(from, "acpi_sci=low", 12))
 790                         acpi_sci_flags.polarity = 3;
 791
 792 #ifdef CONFIG_X86_IO_APIC
 793                 else if (!memcmp(from, "acpi_skip_timer_override", 24))
 794                         acpi_skip_timer_override = 1;
 795 #endif
 796
 797 #ifdef CONFIG_X86_LOCAL_APIC
 798                 /* disable IO-APIC */
 799                 else if (!memcmp(from, "noapic", 6))
 800                         disable_ioapic_setup();
 801 #endif /* CONFIG_X86_LOCAL_APIC */
 802 #endif /* CONFIG_ACPI_BOOT */
 803
 804                 /*
 805                  * highmem=size forces highmem to be exactly 'size' bytes.
 806                  * This works even on boxes that have no highmem otherwise.
 807                  * This also works to reduce highmem size on bigger boxes.
 808                  */
 809                 if (c == ' ' && !memcmp(from, "highmem=", 8))
 810                         highmem_pages = memparse(from+8, &from) >> PAGE_SHIFT;
 811
 812                 c = *(from++);
 813                 if (!c)
 814                         break;
 815                 if (COMMAND_LINE_SIZE <= ++len)
 816                         break;
 817                 *(to++) = c;
 818         }
 819         *to = '\0';
 820         *cmdline_p = command_line;
 821         if (userdef) {
 822                 printk(KERN_INFO "user-defined physical RAM map:\n");
 823                 print_memory_map("user");
 824         }
 825 }
 826
 827 /*
 828  * Callback for efi_memory_walk.
 829  */
 830 static int __init
 831 efi_find_max_pfn(unsigned long start, unsigned long end, void *arg)
 832 {
 833         unsigned long *max_pfn = arg, pfn;
 834
 835         if (start < end) {
 836                 pfn = PFN_UP(end -1);
 837                 if (pfn > *max_pfn)
 838                         *max_pfn = pfn;
 839         }
 840         return 0;
 841 }
 842
 843
 844 /*
 845  * Find the highest page frame number we have available
 846  */
 847 void __init find_max_pfn(void)
 848 {
 849         int i;
 850
 851         max_pfn = 0;
 852         if (efi_enabled) {
 853                 efi_memmap_walk(efi_find_max_pfn, &max_pfn);
 854                 return;
 855         }
 856
 857         for (i = 0; i < e820.nr_map; i++) {
 858                 unsigned long start, end;
 859                 /* RAM? */
 860                 if (e820.map[i].type != E820_RAM)
 861                         continue;
 862                 start = PFN_UP(e820.map[i].addr);
 863                 end = PFN_DOWN(e820.map[i].addr + e820.map[i].size);
 864                 if (start >= end)
 865                         continue;
 866                 if (end > max_pfn)
 867                         max_pfn = end;
 868         }
 869 }
 870
 871 /*
 872  * Determine low and high memory ranges:
 873  */
 874 unsigned long __init find_max_low_pfn(void)
 875 {
 876         unsigned long max_low_pfn;
 877
 878         max_low_pfn = max_pfn;
 879         if (max_low_pfn > MAXMEM_PFN) {
 880                 if (highmem_pages == -1)
 881                         highmem_pages = max_pfn - MAXMEM_PFN;
 882                 if (highmem_pages + MAXMEM_PFN < max_pfn)
 883                         max_pfn = MAXMEM_PFN + highmem_pages;
 884                 if (highmem_pages + MAXMEM_PFN > max_pfn) {
 885                         printk("only %luMB highmem pages available, ignoring highmem size of %uMB.\n", pages_to_mb(max_pfn - MAXMEM_PFN), pages_to_mb(highmem_pages));
 886                         highmem_pages = 0;
 887                 }
 888                 max_low_pfn = MAXMEM_PFN;
 889 #ifndef CONFIG_HIGHMEM
 890                 /* Maximum memory usable is what is directly addressable */
 891                 printk(KERN_WARNING "Warning only %ldMB will be used.\n",
 892                                         MAXMEM>>20);
 893                 if (max_pfn > MAX_NONPAE_PFN)
 894                         printk(KERN_WARNING "Use a PAE enabled kernel.\n");
 895                 else
 896                         printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
 897                 max_pfn = MAXMEM_PFN;
 898 #else /* !CONFIG_HIGHMEM */
 899 #ifndef CONFIG_X86_PAE
 900                 if (max_pfn > MAX_NONPAE_PFN) {
 901                         max_pfn = MAX_NONPAE_PFN;
 902                         printk(KERN_WARNING "Warning only 4GB will be used.\n");
 903                         printk(KERN_WARNING "Use a PAE enabled kernel.\n");
 904                 }
 905 #endif /* !CONFIG_X86_PAE */
 906 #endif /* !CONFIG_HIGHMEM */
 907         } else {
 908                 if (highmem_pages == -1)
 909                         highmem_pages = 0;
 910 #ifdef CONFIG_HIGHMEM
 911                 if (highmem_pages >= max_pfn) {
 912                         printk(KERN_ERR "highmem size specified (%uMB) is bigger than pages available (%luMB)!.\n", pages_to_mb(highmem_pages), pages_to_mb(max_pfn));
 913                         highmem_pages = 0;
 914                 }
 915                 if (highmem_pages) {
 916                         if (max_low_pfn-highmem_pages < 64*1024*1024/PAGE_SIZE){
 917                                 printk(KERN_ERR "highmem size %uMB results in smaller than 64MB lowmem, ignoring it.\n", pages_to_mb(highmem_pages));
 918                                 highmem_pages = 0;
 919                         }
 920                         max_low_pfn -= highmem_pages;
 921                 }
 922 #else
 923                 if (highmem_pages)
 924                         printk(KERN_ERR "ignoring highmem size on non-highmem kernel!\n");
 925 #endif
 926         }
 927         return max_low_pfn;
 928 }
 929
 930 #ifndef CONFIG_DISCONTIGMEM
 931
 932 /*
 933  * Free all available memory for boot time allocation.  Used
 934  * as a callback function by efi_memory_walk()
 935  */
 936
 937 static int __init
 938 free_available_memory(unsigned long start, unsigned long end, void *arg)
 939 {
 940         /* check max_low_pfn */
 941         if (start >= ((max_low_pfn + 1) << PAGE_SHIFT))
 942                 return 0;
 943         if (end >= ((max_low_pfn + 1) << PAGE_SHIFT))
 944                 end = (max_low_pfn + 1) << PAGE_SHIFT;
 945         if (start < end)
 946                 free_bootmem(start, end - start);
 947
 948         return 0;
 949 }
 950 /*
 951  * Register fully available low RAM pages with the bootmem allocator.
 952  */
 953 static void __init register_bootmem_low_pages(unsigned long max_low_pfn)
 954 {
 955         int i;
 956
 957         if (efi_enabled) {
 958                 efi_memmap_walk(free_available_memory, NULL);
 959                 return;
 960         }
 961         for (i = 0; i < e820.nr_map; i++) {
 962                 unsigned long curr_pfn, last_pfn, size;
 963                 /*
 964                  * Reserve usable low memory
 965                  */
 966                 if (e820.map[i].type != E820_RAM)
 967                         continue;
 968                 /*
 969                  * We are rounding up the start address of usable memory:
 970                  */
 971                 curr_pfn = PFN_UP(e820.map[i].addr);
 972                 if (curr_pfn >= max_low_pfn)
 973                         continue;
 974                 /*
 975                  * ... and at the end of the usable range downwards:
 976                  */
 977                 last_pfn = PFN_DOWN(e820.map[i].addr + e820.map[i].size);
 978
 979                 if (last_pfn > max_low_pfn)
 980                         last_pfn = max_low_pfn;
 981
 982                 /*
 983                  * .. finally, did all the rounding and playing
 984                  * around just make the area go away?
 985                  */
 986                 if (last_pfn <= curr_pfn)
 987                         continue;
 988
 989                 size = last_pfn - curr_pfn;
 990                 free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(size));
 991         }
 992 }
 993
 994 static unsigned long __init setup_memory(void)
 995 {
 996         unsigned long bootmap_size, start_pfn, max_low_pfn;
 997
 998         /*
 999          * partially used pages are not usable - thus
1000          * we are rounding upwards:
1001          */
1002         start_pfn = PFN_UP(init_pg_tables_end);
1003
1004         find_max_pfn();
1005
1006         max_low_pfn = find_max_low_pfn();
1007
1008 #ifdef CONFIG_HIGHMEM
1009         highstart_pfn = highend_pfn = max_pfn;
1010         if (max_pfn > max_low_pfn) {
1011                 highstart_pfn = max_low_pfn;
1012         }
1013         printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
1014                 pages_to_mb(highend_pfn - highstart_pfn));
1015 #endif
1016         printk(KERN_NOTICE "%ldMB LOWMEM available.\n",
1017                         pages_to_mb(max_low_pfn));
1018         /*
1019          * Initialize the boot-time allocator (with low memory only):
1020          */
1021         bootmap_size = init_bootmem(start_pfn, max_low_pfn);
1022
1023         register_bootmem_low_pages(max_low_pfn);
1024
1025         /*
1026          * Reserve the bootmem bitmap itself as well. We do this in two
1027          * steps (first step was init_bootmem()) because this catches
1028          * the (very unlikely) case of us accidentally initializing the
1029          * bootmem allocator with an invalid RAM area.
1030          */
1031         reserve_bootmem(HIGH_MEMORY, (PFN_PHYS(start_pfn) +
1032                          bootmap_size + PAGE_SIZE-1) - (HIGH_MEMORY));
1033
1034         /*
1035          * reserve physical page 0 - it's a special BIOS page on many boxes,
1036          * enabling clean reboots, SMP operation, laptop functions.
1037          */
1038         reserve_bootmem(0, PAGE_SIZE);
1039
1040     /* could be an AMD 768MPX chipset. Reserve a page  before VGA to prevent
1041        PCI prefetch into it (errata #56). Usually the page is reserved anyways,
1042        unless you have no PS/2 mouse plugged in. */
1043         if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
1044             boot_cpu_data.x86 == 6)
1045              reserve_bootmem(0xa0000 - 4096, 4096);
1046
1047 #ifdef CONFIG_SMP
1048         /*
1049          * But first pinch a few for the stack/trampoline stuff
1050          * FIXME: Don't need the extra page at 4K, but need to fix
1051          * trampoline before removing it. (see the GDT stuff)
1052          */
1053         reserve_bootmem(PAGE_SIZE, PAGE_SIZE);
1054 #endif
1055 #ifdef CONFIG_ACPI_SLEEP
1056         /*
1057          * Reserve low memory region for sleep support.
1058          */
1059         acpi_reserve_bootmem();
1060 #endif
1061 #ifdef CONFIG_X86_FIND_SMP_CONFIG
1062         /*
1063          * Find and reserve possible boot-time SMP configuration:
1064          */
1065         find_smp_config();
1066 #endif
1067
1068 #ifdef CONFIG_BLK_DEV_INITRD
1069         if (LOADER_TYPE && INITRD_START) {
1070                 if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
1071                         reserve_bootmem(INITRD_START, INITRD_SIZE);
1072                         initrd_start =
1073                                 INITRD_START ? INITRD_START + PAGE_OFFSET : 0;
1074                         initrd_end = initrd_start+INITRD_SIZE;
1075                 }
1076                 else {
1077                         printk(KERN_ERR "initrd extends beyond end of memory "
1078                             "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
1079                             INITRD_START + INITRD_SIZE,
1080                             max_low_pfn << PAGE_SHIFT);
1081                         initrd_start = 0;
1082                 }
1083         }
1084 #endif
1085         return max_low_pfn;
1086 }
1087 #else
1088 extern unsigned long setup_memory(void);
1089 #endif /* !CONFIG_DISCONTIGMEM */
1090
1091 /*
1092  * Request address space for all standard RAM and ROM resources
1093  * and also for regions reported as reserved by the e820.
1094  */
1095 static void __init
1096 legacy_init_iomem_resources(struct resource *code_resource, struct resource *data_resource)
1097 {
1098         int i;
1099
1100         probe_roms();
1101         for (i = 0; i < e820.nr_map; i++) {
1102                 struct resource *res;
1103                 if (e820.map[i].addr + e820.map[i].size > 0x100000000ULL)
1104                         continue;
1105                 res = alloc_bootmem_low(sizeof(struct resource));
1106                 switch (e820.map[i].type) {
1107                 case E820_RAM:  res->name = "System RAM"; break;
1108                 case E820_ACPI: res->name = "ACPI Tables"; break;
1109                 case E820_NVS:  res->name = "ACPI Non-volatile Storage"; break;
1110                 default:        res->name = "reserved";
1111                 }
1112                 res->start = e820.map[i].addr;
1113                 res->end = res->start + e820.map[i].size - 1;
1114                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
1115                 request_resource(&iomem_resource, res);
1116                 if (e820.map[i].type == E820_RAM) {
1117                         /*
1118                          *  We don't know which RAM region contains kernel data,
1119                          *  so we try it repeatedly and let the resource manager
1120                          *  test it.
1121                          */
1122                         request_resource(res, code_resource);
1123                         request_resource(res, data_resource);
1124                 }
1125         }
1126 }
1127
1128 /*
1129  * Request address space for all standard resources
1130  */
1131 static void __init register_memory(unsigned long max_low_pfn)
1132 {
1133         unsigned long low_mem_size;
1134         int           i;
1135
1136         if (efi_enabled)
1137                 efi_initialize_iomem_resources(&code_resource, &data_resource);
1138         else
1139                 legacy_init_iomem_resources(&code_resource, &data_resource);
1140
1141         /* EFI systems may still have VGA */
1142         request_resource(&iomem_resource, &video_ram_resource);
1143
1144         /* request I/O space for devices used on all i[345]86 PCs */
1145         for (i = 0; i < STANDARD_IO_RESOURCES; i++)
1146                 request_resource(&ioport_resource, &standard_io_resources[i]);
1147
1148         /* Tell the PCI layer not to allocate too close to the RAM area.. */
1149         low_mem_size = ((max_low_pfn << PAGE_SHIFT) + 0xfffff) & ~0xfffff;
1150         if (low_mem_size > pci_mem_start)
1151                 pci_mem_start = low_mem_size;
1152 }
1153
1154 /* Use inline assembly to define this because the nops are defined
1155    as inline assembly strings in the include files and we cannot
1156    get them easily into strings. */
1157 asm("\t.data\nintelnops: "
1158     GENERIC_NOP1 GENERIC_NOP2 GENERIC_NOP3 GENERIC_NOP4 GENERIC_NOP5 GENERIC_NOP6
1159     GENERIC_NOP7 GENERIC_NOP8);
1160 asm("\t.data\nk8nops: "
1161     K8_NOP1 K8_NOP2 K8_NOP3 K8_NOP4 K8_NOP5 K8_NOP6
1162     K8_NOP7 K8_NOP8);
1163 asm("\t.data\nk7nops: "
1164     K7_NOP1 K7_NOP2 K7_NOP3 K7_NOP4 K7_NOP5 K7_NOP6
1165     K7_NOP7 K7_NOP8);
1166
1167 extern unsigned char intelnops[], k8nops[], k7nops[];
1168 static unsigned char *intel_nops[ASM_NOP_MAX+1] = {
1169      NULL,
1170      intelnops,
1171      intelnops + 1,
1172      intelnops + 1 + 2,
1173      intelnops + 1 + 2 + 3,
1174      intelnops + 1 + 2 + 3 + 4,
1175      intelnops + 1 + 2 + 3 + 4 + 5,
1176      intelnops + 1 + 2 + 3 + 4 + 5 + 6,
1177      intelnops + 1 + 2 + 3 + 4 + 5 + 6 + 7,
1178 };
1179 static unsigned char *k8_nops[ASM_NOP_MAX+1] = {
1180      NULL,
1181      k8nops,
1182      k8nops + 1,
1183      k8nops + 1 + 2,
1184      k8nops + 1 + 2 + 3,
1185      k8nops + 1 + 2 + 3 + 4,
1186      k8nops + 1 + 2 + 3 + 4 + 5,
1187      k8nops + 1 + 2 + 3 + 4 + 5 + 6,
1188      k8nops + 1 + 2 + 3 + 4 + 5 + 6 + 7,
1189 };
1190 static unsigned char *k7_nops[ASM_NOP_MAX+1] = {
1191      NULL,
1192      k7nops,
1193      k7nops + 1,
1194      k7nops + 1 + 2,
1195      k7nops + 1 + 2 + 3,
1196      k7nops + 1 + 2 + 3 + 4,
1197      k7nops + 1 + 2 + 3 + 4 + 5,
1198      k7nops + 1 + 2 + 3 + 4 + 5 + 6,
1199      k7nops + 1 + 2 + 3 + 4 + 5 + 6 + 7,
1200 };
1201 static struct nop {
1202      int cpuid;
1203      unsigned char **noptable;
1204 } noptypes[] = {
1205      { X86_FEATURE_K8, k8_nops },
1206      { X86_FEATURE_K7, k7_nops },
1207      { -1, NULL }
1208 };
1209
1210 /* Replace instructions with better alternatives for this CPU type.
1211
1212    This runs before SMP is initialized to avoid SMP problems with
1213    self modifying code. This implies that assymetric systems where
1214    APs have less capabilities than the boot processor are not handled.
1215    In this case boot with "noreplacement". */
1216 void apply_alternatives(void *start, void *end)
1217 {
1218         struct alt_instr *a;
1219         int diff, i, k;
1220         unsigned char **noptable = intel_nops;
1221         for (i = 0; noptypes[i].cpuid >= 0; i++) {
1222                 if (boot_cpu_has(noptypes[i].cpuid)) {
1223                         noptable = noptypes[i].noptable;
1224                         break;
1225                 }
1226         }
1227         for (a = start; (void *)a < end; a++) {
1228                 if (!boot_cpu_has(a->cpuid))
1229                         continue;
1230                 BUG_ON(a->replacementlen > a->instrlen);
1231                 memcpy(a->instr, a->replacement, a->replacementlen);
1232                 diff = a->instrlen - a->replacementlen;
1233                 /* Pad the rest with nops */
1234                 for (i = a->replacementlen; diff > 0; diff -= k, i += k) {
1235                         k = diff;
1236                         if (k > ASM_NOP_MAX)
1237                                 k = ASM_NOP_MAX;
1238                         memcpy(a->instr + i, noptable[k], k);
1239                 }
1240         }
1241 }
1242
1243 static int no_replacement __initdata = 0;
1244
1245 void __init alternative_instructions(void)
1246 {
1247         extern struct alt_instr __alt_instructions[], __alt_instructions_end[];
1248         if (no_replacement)
1249                 return;
1250         apply_alternatives(__alt_instructions, __alt_instructions_end);
1251 }
1252
1253 static int __init noreplacement_setup(char *s)
1254 {
1255      no_replacement = 1;
1256      return 0;
1257 }
1258
1259 __setup("noreplacement", noreplacement_setup);
1260
1261 static char * __init machine_specific_memory_setup(void);
1262
1263 /*
1264  * Determine if we were loaded by an EFI loader.  If so, then we have also been
1265  * passed the efi memmap, systab, etc., so we should use these data structures
1266  * for initialization.  Note, the efi init code path is determined by the
1267  * global efi_enabled. This allows the same kernel image to be used on existing
1268  * systems (with a traditional BIOS) as well as on EFI systems.
1269  */
1270 void __init setup_arch(char **cmdline_p)
1271 {
1272         unsigned long max_low_pfn;
1273
1274         memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
1275         pre_setup_arch_hook();
1276         early_cpu_init();
1277
1278         /*
1279          * FIXME: This isn't an official loader_type right
1280          * now but does currently work with elilo.
1281          * If we were configured as an EFI kernel, check to make
1282          * sure that we were loaded correctly from elilo and that
1283          * the system table is valid.  If not, then initialize normally.
1284          */
1285 #ifdef CONFIG_EFI
1286         if ((LOADER_TYPE == 0x50) && EFI_SYSTAB)
1287                 efi_enabled = 1;
1288 #endif
1289
1290         ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
1291         drive_info = DRIVE_INFO;
1292         screen_info = SCREEN_INFO;
1293         edid_info = EDID_INFO;
1294         apm_info.bios = APM_BIOS_INFO;
1295         ist_info = IST_INFO;
1296         saved_videomode = VIDEO_MODE;
1297         if( SYS_DESC_TABLE.length != 0 ) {
1298                 MCA_bus = SYS_DESC_TABLE.table[3] &0x2;
1299                 machine_id = SYS_DESC_TABLE.table[0];
1300                 machine_submodel_id = SYS_DESC_TABLE.table[1];
1301                 BIOS_revision = SYS_DESC_TABLE.table[2];
1302         }
1303         aux_device_present = AUX_DEVICE_INFO;
1304
1305 #ifdef CONFIG_BLK_DEV_RAM
1306         rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
1307         rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
1308         rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
1309 #endif
1310         ARCH_SETUP
1311         if (efi_enabled)
1312                 efi_init();
1313         else {
1314                 printk(KERN_INFO "BIOS-provided physical RAM map:\n");
1315                 print_memory_map(machine_specific_memory_setup());
1316         }
1317
1318         copy_edd();
1319
1320         if (!MOUNT_ROOT_RDONLY)
1321                 root_mountflags &= ~MS_RDONLY;
1322         init_mm.start_code = (unsigned long) _text;
1323         init_mm.end_code = (unsigned long) _etext;
1324         init_mm.end_data = (unsigned long) _edata;
1325         init_mm.brk = init_pg_tables_end + PAGE_OFFSET;
1326
1327         code_resource.start = virt_to_phys(_text);
1328         code_resource.end = virt_to_phys(_etext)-1;
1329         data_resource.start = virt_to_phys(_etext);
1330         data_resource.end = virt_to_phys(_edata)-1;
1331
1332         parse_cmdline_early(cmdline_p);
1333
1334         max_low_pfn = setup_memory();
1335
1336         /*
1337          * NOTE: before this point _nobody_ is allowed to allocate
1338          * any memory using the bootmem allocator.
1339          */
1340
1341 #ifdef CONFIG_SMP
1342         smp_alloc_memory(); /* AP processor realmode stacks in low memory*/
1343 #endif
1344         paging_init();
1345
1346 #ifdef CONFIG_EARLY_PRINTK
1347         {
1348                 char *s = strstr(*cmdline_p, "earlyprintk=");
1349                 if (s) {
1350                         extern void setup_early_printk(char *);
1351
1352                         setup_early_printk(s);
1353                         printk("early console enabled\n");
1354                 }
1355         }
1356 #endif
1357
1358
1359         dmi_scan_machine();
1360
1361 #ifdef CONFIG_X86_GENERICARCH
1362         generic_apic_probe(*cmdline_p);
1363 #endif
1364         if (efi_enabled)
1365                 efi_map_memmap();
1366
1367         /*
1368          * Parse the ACPI tables for possible boot-time SMP configuration.
1369          */
1370         acpi_boot_init();
1371
1372 #ifdef CONFIG_X86_LOCAL_APIC
1373         if (smp_found_config)
1374                 get_smp_config();
1375 #endif
1376
1377         register_memory(max_low_pfn);
1378
1379 #ifdef CONFIG_VT
1380 #if defined(CONFIG_VGA_CONSOLE)
1381         if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
1382                 conswitchp = &vga_con;
1383 #elif defined(CONFIG_DUMMY_CONSOLE)
1384         conswitchp = &dummy_con;
1385 #endif
1386 #endif
1387 }
1388
1389 #include "setup_arch_post.h"
1390 /*
1391  * Local Variables:
1392  * mode:c
1393  * c-file-style:"k&r"
1394  * c-basic-offset:8
1395  * End:
1396  */