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