arch/x86/kernel/setup_32.c

   1 /*
   2  *  Copyright (C) 1995  Linus Torvalds
   3  *
   4  *  Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999
   5  *
   6  *  Memory region support
   7  *      David Parsons <orc@pell.chi.il.us>, July-August 1999
   8  *
   9  *  Added E820 sanitization routine (removes overlapping memory regions);
  10  *  Brian Moyle <bmoyle@mvista.com>, February 2001
  11  *
  12  * Moved CPU detection code to cpu/${cpu}.c
  13  *    Patrick Mochel <mochel@osdl.org>, March 2002
  14  *
  15  *  Provisions for empty E820 memory regions (reported by certain BIOSes).
  16  *  Alex Achenbach <xela@slit.de>, December 2002.
  17  *
  18  */
  19
  20 /*
  21  * This file handles the architecture-dependent parts of initialization
  22  */
  23
  24 #include <linux/sched.h>
  25 #include <linux/mm.h>
  26 #include <linux/mmzone.h>
  27 #include <linux/screen_info.h>
  28 #include <linux/ioport.h>
  29 #include <linux/acpi.h>
  30 #include <linux/apm_bios.h>
  31 #include <linux/initrd.h>
  32 #include <linux/bootmem.h>
  33 #include <linux/seq_file.h>
  34 #include <linux/console.h>
  35 #include <linux/mca.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 <linux/nodemask.h>
  43 #include <linux/kexec.h>
  44 #include <linux/crash_dump.h>
  45 #include <linux/dmi.h>
  46 #include <linux/pfn.h>
  47 #include <linux/pci.h>
  48 #include <linux/init_ohci1394_dma.h>
  49
  50 #include <video/edid.h>
  51
  52 #include <asm/mtrr.h>
  53 #include <asm/apic.h>
  54 #include <asm/e820.h>
  55 #include <asm/mpspec.h>
  56 #include <asm/mmzone.h>
  57 #include <asm/setup.h>
  58 #include <asm/arch_hooks.h>
  59 #include <asm/sections.h>
  60 #include <asm/io_apic.h>
  61 #include <asm/ist.h>
  62 #include <asm/io.h>
  63 #include <asm/vmi.h>
  64 #include <setup_arch.h>
  65 #include <bios_ebda.h>
  66 #include <asm/cacheflush.h>
  67
  68 /* This value is set up by the early boot code to point to the value
  69    immediately after the boot time page tables.  It contains a *physical*
  70    address, and must not be in the .bss segment! */
  71 unsigned long init_pg_tables_end __initdata = ~0UL;
  72
  73 /*
  74  * Machine setup..
  75  */
  76 static struct resource data_resource = {
  77         .name   = "Kernel data",
  78         .start  = 0,
  79         .end    = 0,
  80         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
  81 };
  82
  83 static struct resource code_resource = {
  84         .name   = "Kernel code",
  85         .start  = 0,
  86         .end    = 0,
  87         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
  88 };
  89
  90 static struct resource bss_resource = {
  91         .name   = "Kernel bss",
  92         .start  = 0,
  93         .end    = 0,
  94         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
  95 };
  96
  97 static struct resource video_ram_resource = {
  98         .name   = "Video RAM area",
  99         .start  = 0xa0000,
 100         .end    = 0xbffff,
 101         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 102 };
 103
 104 static struct resource standard_io_resources[] = { {
 105         .name   = "dma1",
 106         .start  = 0x0000,
 107         .end    = 0x001f,
 108         .flags  = IORESOURCE_BUSY | IORESOURCE_IO
 109 }, {
 110         .name   = "pic1",
 111         .start  = 0x0020,
 112         .end    = 0x0021,
 113         .flags  = IORESOURCE_BUSY | IORESOURCE_IO
 114 }, {
 115         .name   = "timer0",
 116         .start  = 0x0040,
 117         .end    = 0x0043,
 118         .flags  = IORESOURCE_BUSY | IORESOURCE_IO
 119 }, {
 120         .name   = "timer1",
 121         .start  = 0x0050,
 122         .end    = 0x0053,
 123         .flags  = IORESOURCE_BUSY | IORESOURCE_IO
 124 }, {
 125         .name   = "keyboard",
 126         .start  = 0x0060,
 127         .end    = 0x006f,
 128         .flags  = IORESOURCE_BUSY | IORESOURCE_IO
 129 }, {
 130         .name   = "dma page reg",
 131         .start  = 0x0080,
 132         .end    = 0x008f,
 133         .flags  = IORESOURCE_BUSY | IORESOURCE_IO
 134 }, {
 135         .name   = "pic2",
 136         .start  = 0x00a0,
 137         .end    = 0x00a1,
 138         .flags  = IORESOURCE_BUSY | IORESOURCE_IO
 139 }, {
 140         .name   = "dma2",
 141         .start  = 0x00c0,
 142         .end    = 0x00df,
 143         .flags  = IORESOURCE_BUSY | IORESOURCE_IO
 144 }, {
 145         .name   = "fpu",
 146         .start  = 0x00f0,
 147         .end    = 0x00ff,
 148         .flags  = IORESOURCE_BUSY | IORESOURCE_IO
 149 } };
 150
 151 /* cpu data as detected by the assembly code in head.S */
 152 struct cpuinfo_x86 new_cpu_data __cpuinitdata = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
 153 /* common cpu data for all cpus */
 154 struct cpuinfo_x86 boot_cpu_data __read_mostly = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
 155 EXPORT_SYMBOL(boot_cpu_data);
 156
 157 #ifndef CONFIG_X86_PAE
 158 unsigned long mmu_cr4_features;
 159 #else
 160 unsigned long mmu_cr4_features = X86_CR4_PAE;
 161 #endif
 162
 163 /* for MCA, but anyone else can use it if they want */
 164 unsigned int machine_id;
 165 unsigned int machine_submodel_id;
 166 unsigned int BIOS_revision;
 167
 168 /* Boot loader ID as an integer, for the benefit of proc_dointvec */
 169 int bootloader_type;
 170
 171 /* user-defined highmem size */
 172 static unsigned int highmem_pages = -1;
 173
 174 /*
 175  * Setup options
 176  */
 177 struct screen_info screen_info;
 178 EXPORT_SYMBOL(screen_info);
 179 struct apm_info apm_info;
 180 EXPORT_SYMBOL(apm_info);
 181 struct edid_info edid_info;
 182 EXPORT_SYMBOL_GPL(edid_info);
 183 struct ist_info ist_info;
 184 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
 185         defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
 186 EXPORT_SYMBOL(ist_info);
 187 #endif
 188
 189 extern void early_cpu_init(void);
 190 extern int root_mountflags;
 191
 192 unsigned long saved_videomode;
 193
 194 #define RAMDISK_IMAGE_START_MASK        0x07FF
 195 #define RAMDISK_PROMPT_FLAG             0x8000
 196 #define RAMDISK_LOAD_FLAG               0x4000
 197
 198 static char __initdata command_line[COMMAND_LINE_SIZE];
 199
 200 #ifndef CONFIG_DEBUG_BOOT_PARAMS
 201 struct boot_params __initdata boot_params;
 202 #else
 203 struct boot_params boot_params;
 204 #endif
 205
 206 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
 207 struct edd edd;
 208 #ifdef CONFIG_EDD_MODULE
 209 EXPORT_SYMBOL(edd);
 210 #endif
 211 /**
 212  * copy_edd() - Copy the BIOS EDD information
 213  *              from boot_params into a safe place.
 214  *
 215  */
 216 static inline void copy_edd(void)
 217 {
 218      memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
 219             sizeof(edd.mbr_signature));
 220      memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
 221      edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
 222      edd.edd_info_nr = boot_params.eddbuf_entries;
 223 }
 224 #else
 225 static inline void copy_edd(void)
 226 {
 227 }
 228 #endif
 229
 230 int __initdata user_defined_memmap = 0;
 231
 232 /*
 233  * "mem=nopentium" disables the 4MB page tables.
 234  * "mem=XXX[kKmM]" defines a memory region from HIGH_MEM
 235  * to <mem>, overriding the bios size.
 236  * "memmap=XXX[KkmM]@XXX[KkmM]" defines a memory region from
 237  * <start> to <start>+<mem>, overriding the bios size.
 238  *
 239  * HPA tells me bootloaders need to parse mem=, so no new
 240  * option should be mem=  [also see Documentation/i386/boot.txt]
 241  */
 242 static int __init parse_mem(char *arg)
 243 {
 244         if (!arg)
 245                 return -EINVAL;
 246
 247         if (strcmp(arg, "nopentium") == 0) {
 248                 setup_clear_cpu_cap(X86_FEATURE_PSE);
 249         } else {
 250                 /* If the user specifies memory size, we
 251                  * limit the BIOS-provided memory map to
 252                  * that size. exactmap can be used to specify
 253                  * the exact map. mem=number can be used to
 254                  * trim the existing memory map.
 255                  */
 256                 unsigned long long mem_size;
 257
 258                 mem_size = memparse(arg, &arg);
 259                 limit_regions(mem_size);
 260                 user_defined_memmap = 1;
 261         }
 262         return 0;
 263 }
 264 early_param("mem", parse_mem);
 265
 266 #ifdef CONFIG_PROC_VMCORE
 267 /* elfcorehdr= specifies the location of elf core header
 268  * stored by the crashed kernel.
 269  */
 270 static int __init parse_elfcorehdr(char *arg)
 271 {
 272         if (!arg)
 273                 return -EINVAL;
 274
 275         elfcorehdr_addr = memparse(arg, &arg);
 276         return 0;
 277 }
 278 early_param("elfcorehdr", parse_elfcorehdr);
 279 #endif /* CONFIG_PROC_VMCORE */
 280
 281 /*
 282  * highmem=size forces highmem to be exactly 'size' bytes.
 283  * This works even on boxes that have no highmem otherwise.
 284  * This also works to reduce highmem size on bigger boxes.
 285  */
 286 static int __init parse_highmem(char *arg)
 287 {
 288         if (!arg)
 289                 return -EINVAL;
 290
 291         highmem_pages = memparse(arg, &arg) >> PAGE_SHIFT;
 292         return 0;
 293 }
 294 early_param("highmem", parse_highmem);
 295
 296 /*
 297  * vmalloc=size forces the vmalloc area to be exactly 'size'
 298  * bytes. This can be used to increase (or decrease) the
 299  * vmalloc area - the default is 128m.
 300  */
 301 static int __init parse_vmalloc(char *arg)
 302 {
 303         if (!arg)
 304                 return -EINVAL;
 305
 306         __VMALLOC_RESERVE = memparse(arg, &arg);
 307         return 0;
 308 }
 309 early_param("vmalloc", parse_vmalloc);
 310
 311 /*
 312  * reservetop=size reserves a hole at the top of the kernel address space which
 313  * a hypervisor can load into later.  Needed for dynamically loaded hypervisors,
 314  * so relocating the fixmap can be done before paging initialization.
 315  */
 316 static int __init parse_reservetop(char *arg)
 317 {
 318         unsigned long address;
 319
 320         if (!arg)
 321                 return -EINVAL;
 322
 323         address = memparse(arg, &arg);
 324         reserve_top_address(address);
 325         return 0;
 326 }
 327 early_param("reservetop", parse_reservetop);
 328
 329 /*
 330  * Determine low and high memory ranges:
 331  */
 332 unsigned long __init find_max_low_pfn(void)
 333 {
 334         unsigned long max_low_pfn;
 335
 336         max_low_pfn = max_pfn;
 337         if (max_low_pfn > MAXMEM_PFN) {
 338                 if (highmem_pages == -1)
 339                         highmem_pages = max_pfn - MAXMEM_PFN;
 340                 if (highmem_pages + MAXMEM_PFN < max_pfn)
 341                         max_pfn = MAXMEM_PFN + highmem_pages;
 342                 if (highmem_pages + MAXMEM_PFN > max_pfn) {
 343                         printk("only %luMB highmem pages available, ignoring highmem size of %uMB.\n", pages_to_mb(max_pfn - MAXMEM_PFN), pages_to_mb(highmem_pages));
 344                         highmem_pages = 0;
 345                 }
 346                 max_low_pfn = MAXMEM_PFN;
 347 #ifndef CONFIG_HIGHMEM
 348                 /* Maximum memory usable is what is directly addressable */
 349                 printk(KERN_WARNING "Warning only %ldMB will be used.\n",
 350                                         MAXMEM>>20);
 351                 if (max_pfn > MAX_NONPAE_PFN)
 352                         printk(KERN_WARNING "Use a HIGHMEM64G enabled kernel.\n");
 353                 else
 354                         printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
 355                 max_pfn = MAXMEM_PFN;
 356 #else /* !CONFIG_HIGHMEM */
 357 #ifndef CONFIG_HIGHMEM64G
 358                 if (max_pfn > MAX_NONPAE_PFN) {
 359                         max_pfn = MAX_NONPAE_PFN;
 360                         printk(KERN_WARNING "Warning only 4GB will be used.\n");
 361                         printk(KERN_WARNING "Use a HIGHMEM64G enabled kernel.\n");
 362                 }
 363 #endif /* !CONFIG_HIGHMEM64G */
 364 #endif /* !CONFIG_HIGHMEM */
 365         } else {
 366                 if (highmem_pages == -1)
 367                         highmem_pages = 0;
 368 #ifdef CONFIG_HIGHMEM
 369                 if (highmem_pages >= max_pfn) {
 370                         printk(KERN_ERR "highmem size specified (%uMB) is bigger than pages available (%luMB)!.\n", pages_to_mb(highmem_pages), pages_to_mb(max_pfn));
 371                         highmem_pages = 0;
 372                 }
 373                 if (highmem_pages) {
 374                         if (max_low_pfn-highmem_pages < 64*1024*1024/PAGE_SIZE){
 375                                 printk(KERN_ERR "highmem size %uMB results in smaller than 64MB lowmem, ignoring it.\n", pages_to_mb(highmem_pages));
 376                                 highmem_pages = 0;
 377                         }
 378                         max_low_pfn -= highmem_pages;
 379                 }
 380 #else
 381                 if (highmem_pages)
 382                         printk(KERN_ERR "ignoring highmem size on non-highmem kernel!\n");
 383 #endif
 384         }
 385         return max_low_pfn;
 386 }
 387
 388 /*
 389  * workaround for Dell systems that neglect to reserve EBDA
 390  */
 391 static void __init reserve_ebda_region(void)
 392 {
 393         unsigned int addr;
 394         addr = get_bios_ebda();
 395         if (addr)
 396                 reserve_bootmem(addr, PAGE_SIZE, BOOTMEM_DEFAULT);
 397 }
 398
 399 #ifndef CONFIG_NEED_MULTIPLE_NODES
 400 void __init setup_bootmem_allocator(void);
 401 static unsigned long __init setup_memory(void)
 402 {
 403         /*
 404          * partially used pages are not usable - thus
 405          * we are rounding upwards:
 406          */
 407         min_low_pfn = PFN_UP(init_pg_tables_end);
 408
 409         find_max_pfn();
 410
 411         max_low_pfn = find_max_low_pfn();
 412
 413 #ifdef CONFIG_HIGHMEM
 414         highstart_pfn = highend_pfn = max_pfn;
 415         if (max_pfn > max_low_pfn) {
 416                 highstart_pfn = max_low_pfn;
 417         }
 418         printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
 419                 pages_to_mb(highend_pfn - highstart_pfn));
 420         num_physpages = highend_pfn;
 421         high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1;
 422 #else
 423         num_physpages = max_low_pfn;
 424         high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1;
 425 #endif
 426 #ifdef CONFIG_FLATMEM
 427         max_mapnr = num_physpages;
 428 #endif
 429         printk(KERN_NOTICE "%ldMB LOWMEM available.\n",
 430                         pages_to_mb(max_low_pfn));
 431
 432         setup_bootmem_allocator();
 433
 434         return max_low_pfn;
 435 }
 436
 437 void __init zone_sizes_init(void)
 438 {
 439         unsigned long max_zone_pfns[MAX_NR_ZONES];
 440         memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
 441         max_zone_pfns[ZONE_DMA] =
 442                 virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
 443         max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
 444 #ifdef CONFIG_HIGHMEM
 445         max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
 446         add_active_range(0, 0, highend_pfn);
 447 #else
 448         add_active_range(0, 0, max_low_pfn);
 449 #endif
 450
 451         free_area_init_nodes(max_zone_pfns);
 452 }
 453 #else
 454 extern unsigned long __init setup_memory(void);
 455 extern void zone_sizes_init(void);
 456 #endif /* !CONFIG_NEED_MULTIPLE_NODES */
 457
 458 static inline unsigned long long get_total_mem(void)
 459 {
 460         unsigned long long total;
 461
 462         total = max_low_pfn - min_low_pfn;
 463 #ifdef CONFIG_HIGHMEM
 464         total += highend_pfn - highstart_pfn;
 465 #endif
 466
 467         return total << PAGE_SHIFT;
 468 }
 469
 470 #ifdef CONFIG_KEXEC
 471 static void __init reserve_crashkernel(void)
 472 {
 473         unsigned long long total_mem;
 474         unsigned long long crash_size, crash_base;
 475         int ret;
 476
 477         total_mem = get_total_mem();
 478
 479         ret = parse_crashkernel(boot_command_line, total_mem,
 480                         &crash_size, &crash_base);
 481         if (ret == 0 && crash_size > 0) {
 482                 if (crash_base > 0) {
 483                         printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
 484                                         "for crashkernel (System RAM: %ldMB)\n",
 485                                         (unsigned long)(crash_size >> 20),
 486                                         (unsigned long)(crash_base >> 20),
 487                                         (unsigned long)(total_mem >> 20));
 488                         crashk_res.start = crash_base;
 489                         crashk_res.end   = crash_base + crash_size - 1;
 490                         reserve_bootmem(crash_base, crash_size,
 491                                         BOOTMEM_DEFAULT);
 492                 } else
 493                         printk(KERN_INFO "crashkernel reservation failed - "
 494                                         "you have to specify a base address\n");
 495         }
 496 }
 497 #else
 498 static inline void __init reserve_crashkernel(void)
 499 {}
 500 #endif
 501
 502 #ifdef CONFIG_BLK_DEV_INITRD
 503
 504 static bool do_relocate_initrd = false;
 505
 506 static void __init reserve_initrd(void)
 507 {
 508         unsigned long ramdisk_image = boot_params.hdr.ramdisk_image;
 509         unsigned long ramdisk_size  = boot_params.hdr.ramdisk_size;
 510         unsigned long ramdisk_end   = ramdisk_image + ramdisk_size;
 511         unsigned long end_of_lowmem = max_low_pfn << PAGE_SHIFT;
 512         unsigned long ramdisk_here;
 513
 514         initrd_start = 0;
 515
 516         if (!boot_params.hdr.type_of_loader ||
 517             !ramdisk_image || !ramdisk_size)
 518                 return;         /* No initrd provided by bootloader */
 519
 520         if (ramdisk_end < ramdisk_image) {
 521                 printk(KERN_ERR "initrd wraps around end of memory, "
 522                        "disabling initrd\n");
 523                 return;
 524         }
 525         if (ramdisk_size >= end_of_lowmem/2) {
 526                 printk(KERN_ERR "initrd too large to handle, "
 527                        "disabling initrd\n");
 528                 return;
 529         }
 530         if (ramdisk_end <= end_of_lowmem) {
 531                 /* All in lowmem, easy case */
 532                 reserve_bootmem(ramdisk_image, ramdisk_size, BOOTMEM_DEFAULT);
 533                 initrd_start = ramdisk_image + PAGE_OFFSET;
 534                 initrd_end = initrd_start+ramdisk_size;
 535                 return;
 536         }
 537
 538         /* We need to move the initrd down into lowmem */
 539         ramdisk_here = (end_of_lowmem - ramdisk_size) & PAGE_MASK;
 540
 541         /* Note: this includes all the lowmem currently occupied by
 542            the initrd, we rely on that fact to keep the data intact. */
 543         reserve_bootmem(ramdisk_here, ramdisk_size, BOOTMEM_DEFAULT);
 544         initrd_start = ramdisk_here + PAGE_OFFSET;
 545         initrd_end   = initrd_start + ramdisk_size;
 546
 547         do_relocate_initrd = true;
 548 }
 549
 550 #define MAX_MAP_CHUNK   (NR_FIX_BTMAPS << PAGE_SHIFT)
 551
 552 static void __init relocate_initrd(void)
 553 {
 554         unsigned long ramdisk_image = boot_params.hdr.ramdisk_image;
 555         unsigned long ramdisk_size  = boot_params.hdr.ramdisk_size;
 556         unsigned long end_of_lowmem = max_low_pfn << PAGE_SHIFT;
 557         unsigned long ramdisk_here;
 558         unsigned long slop, clen, mapaddr;
 559         char *p, *q;
 560
 561         if (!do_relocate_initrd)
 562                 return;
 563
 564         ramdisk_here = initrd_start - PAGE_OFFSET;
 565
 566         q = (char *)initrd_start;
 567
 568         /* Copy any lowmem portion of the initrd */
 569         if (ramdisk_image < end_of_lowmem) {
 570                 clen = end_of_lowmem - ramdisk_image;
 571                 p = (char *)__va(ramdisk_image);
 572                 memcpy(q, p, clen);
 573                 q += clen;
 574                 ramdisk_image += clen;
 575                 ramdisk_size  -= clen;
 576         }
 577
 578         /* Copy the highmem portion of the initrd */
 579         while (ramdisk_size) {
 580                 slop = ramdisk_image & ~PAGE_MASK;
 581                 clen = ramdisk_size;
 582                 if (clen > MAX_MAP_CHUNK-slop)
 583                         clen = MAX_MAP_CHUNK-slop;
 584                 mapaddr = ramdisk_image & PAGE_MASK;
 585                 p = early_ioremap(mapaddr, clen+slop);
 586                 memcpy(q, p+slop, clen);
 587                 early_iounmap(p, clen+slop);
 588                 q += clen;
 589                 ramdisk_image += clen;
 590                 ramdisk_size  -= clen;
 591         }
 592 }
 593
 594 #endif /* CONFIG_BLK_DEV_INITRD */
 595
 596 void __init setup_bootmem_allocator(void)
 597 {
 598         unsigned long bootmap_size;
 599         /*
 600          * Initialize the boot-time allocator (with low memory only):
 601          */
 602         bootmap_size = init_bootmem(min_low_pfn, max_low_pfn);
 603
 604         register_bootmem_low_pages(max_low_pfn);
 605
 606         /*
 607          * Reserve the bootmem bitmap itself as well. We do this in two
 608          * steps (first step was init_bootmem()) because this catches
 609          * the (very unlikely) case of us accidentally initializing the
 610          * bootmem allocator with an invalid RAM area.
 611          */
 612         reserve_bootmem(__pa_symbol(_text), (PFN_PHYS(min_low_pfn) +
 613                          bootmap_size + PAGE_SIZE-1) - __pa_symbol(_text),
 614                          BOOTMEM_DEFAULT);
 615
 616         /*
 617          * reserve physical page 0 - it's a special BIOS page on many boxes,
 618          * enabling clean reboots, SMP operation, laptop functions.
 619          */
 620         reserve_bootmem(0, PAGE_SIZE, BOOTMEM_DEFAULT);
 621
 622         /* reserve EBDA region, it's a 4K region */
 623         reserve_ebda_region();
 624
 625     /* could be an AMD 768MPX chipset. Reserve a page  before VGA to prevent
 626        PCI prefetch into it (errata #56). Usually the page is reserved anyways,
 627        unless you have no PS/2 mouse plugged in. */
 628         if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
 629             boot_cpu_data.x86 == 6)
 630              reserve_bootmem(0xa0000 - 4096, 4096, BOOTMEM_DEFAULT);
 631
 632 #ifdef CONFIG_SMP
 633         /*
 634          * But first pinch a few for the stack/trampoline stuff
 635          * FIXME: Don't need the extra page at 4K, but need to fix
 636          * trampoline before removing it. (see the GDT stuff)
 637          */
 638         reserve_bootmem(PAGE_SIZE, PAGE_SIZE, BOOTMEM_DEFAULT);
 639 #endif
 640 #ifdef CONFIG_ACPI_SLEEP
 641         /*
 642          * Reserve low memory region for sleep support.
 643          */
 644         acpi_reserve_bootmem();
 645 #endif
 646 #ifdef CONFIG_X86_FIND_SMP_CONFIG
 647         /*
 648          * Find and reserve possible boot-time SMP configuration:
 649          */
 650         find_smp_config();
 651 #endif
 652 #ifdef CONFIG_BLK_DEV_INITRD
 653         reserve_initrd();
 654 #endif
 655         numa_kva_reserve();
 656         reserve_crashkernel();
 657 }
 658
 659 /*
 660  * The node 0 pgdat is initialized before all of these because
 661  * it's needed for bootmem.  node>0 pgdats have their virtual
 662  * space allocated before the pagetables are in place to access
 663  * them, so they can't be cleared then.
 664  *
 665  * This should all compile down to nothing when NUMA is off.
 666  */
 667 static void __init remapped_pgdat_init(void)
 668 {
 669         int nid;
 670
 671         for_each_online_node(nid) {
 672                 if (nid != 0)
 673                         memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
 674         }
 675 }
 676
 677 #ifdef CONFIG_MCA
 678 static void set_mca_bus(int x)
 679 {
 680         MCA_bus = x;
 681 }
 682 #else
 683 static void set_mca_bus(int x) { }
 684 #endif
 685
 686 /* Overridden in paravirt.c if CONFIG_PARAVIRT */
 687 char * __init __attribute__((weak)) memory_setup(void)
 688 {
 689         return machine_specific_memory_setup();
 690 }
 691
 692 /*
 693  * Determine if we were loaded by an EFI loader.  If so, then we have also been
 694  * passed the efi memmap, systab, etc., so we should use these data structures
 695  * for initialization.  Note, the efi init code path is determined by the
 696  * global efi_enabled. This allows the same kernel image to be used on existing
 697  * systems (with a traditional BIOS) as well as on EFI systems.
 698  */
 699 void __init setup_arch(char **cmdline_p)
 700 {
 701         unsigned long max_low_pfn;
 702
 703         memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
 704         pre_setup_arch_hook();
 705         early_cpu_init();
 706         early_ioremap_init();
 707
 708 #ifdef CONFIG_EFI
 709         if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
 710                      "EL32", 4))
 711                 efi_enabled = 1;
 712 #endif
 713
 714         ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
 715         screen_info = boot_params.screen_info;
 716         edid_info = boot_params.edid_info;
 717         apm_info.bios = boot_params.apm_bios_info;
 718         ist_info = boot_params.ist_info;
 719         saved_videomode = boot_params.hdr.vid_mode;
 720         if( boot_params.sys_desc_table.length != 0 ) {
 721                 set_mca_bus(boot_params.sys_desc_table.table[3] & 0x2);
 722                 machine_id = boot_params.sys_desc_table.table[0];
 723                 machine_submodel_id = boot_params.sys_desc_table.table[1];
 724                 BIOS_revision = boot_params.sys_desc_table.table[2];
 725         }
 726         bootloader_type = boot_params.hdr.type_of_loader;
 727
 728 #ifdef CONFIG_BLK_DEV_RAM
 729         rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
 730         rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
 731         rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
 732 #endif
 733         ARCH_SETUP
 734
 735         printk(KERN_INFO "BIOS-provided physical RAM map:\n");
 736         print_memory_map(memory_setup());
 737
 738         copy_edd();
 739
 740         if (!boot_params.hdr.root_flags)
 741                 root_mountflags &= ~MS_RDONLY;
 742         init_mm.start_code = (unsigned long) _text;
 743         init_mm.end_code = (unsigned long) _etext;
 744         init_mm.end_data = (unsigned long) _edata;
 745         init_mm.brk = init_pg_tables_end + PAGE_OFFSET;
 746
 747         code_resource.start = virt_to_phys(_text);
 748         code_resource.end = virt_to_phys(_etext)-1;
 749         data_resource.start = virt_to_phys(_etext);
 750         data_resource.end = virt_to_phys(_edata)-1;
 751         bss_resource.start = virt_to_phys(&__bss_start);
 752         bss_resource.end = virt_to_phys(&__bss_stop)-1;
 753
 754         parse_early_param();
 755
 756         if (user_defined_memmap) {
 757                 printk(KERN_INFO "user-defined physical RAM map:\n");
 758                 print_memory_map("user");
 759         }
 760
 761         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 762         *cmdline_p = command_line;
 763
 764         if (efi_enabled)
 765                 efi_init();
 766
 767         max_low_pfn = setup_memory();
 768
 769         /* update e820 for memory not covered by WB MTRRs */
 770         mtrr_bp_init();
 771         if (mtrr_trim_uncached_memory(max_pfn))
 772                 max_low_pfn = setup_memory();
 773
 774 #ifdef CONFIG_VMI
 775         /*
 776          * Must be after max_low_pfn is determined, and before kernel
 777          * pagetables are setup.
 778          */
 779         vmi_init();
 780 #endif
 781
 782         /*
 783          * NOTE: before this point _nobody_ is allowed to allocate
 784          * any memory using the bootmem allocator.  Although the
 785          * allocator is now initialised only the first 8Mb of the kernel
 786          * virtual address space has been mapped.  All allocations before
 787          * paging_init() has completed must use the alloc_bootmem_low_pages()
 788          * variant (which allocates DMA'able memory) and care must be taken
 789          * not to exceed the 8Mb limit.
 790          */
 791
 792 #ifdef CONFIG_SMP
 793         smp_alloc_memory(); /* AP processor realmode stacks in low memory*/
 794 #endif
 795         paging_init();
 796
 797         /*
 798          * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
 799          */
 800
 801 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
 802         if (init_ohci1394_dma_early)
 803                 init_ohci1394_dma_on_all_controllers();
 804 #endif
 805
 806         remapped_pgdat_init();
 807         sparse_init();
 808         zone_sizes_init();
 809
 810         /*
 811          * NOTE: at this point the bootmem allocator is fully available.
 812          */
 813
 814 #ifdef CONFIG_BLK_DEV_INITRD
 815         relocate_initrd();
 816 #endif
 817
 818         paravirt_post_allocator_init();
 819
 820         dmi_scan_machine();
 821
 822         io_delay_init();
 823
 824 #ifdef CONFIG_X86_GENERICARCH
 825         generic_apic_probe();
 826 #endif
 827
 828 #ifdef CONFIG_ACPI
 829         /*
 830          * Parse the ACPI tables for possible boot-time SMP configuration.
 831          */
 832         acpi_boot_table_init();
 833 #endif
 834
 835         early_quirks();
 836
 837 #ifdef CONFIG_ACPI
 838         acpi_boot_init();
 839
 840 #if defined(CONFIG_SMP) && defined(CONFIG_X86_PC)
 841         if (def_to_bigsmp)
 842                 printk(KERN_WARNING "More than 8 CPUs detected and "
 843                         "CONFIG_X86_PC cannot handle it.\nUse "
 844                         "CONFIG_X86_GENERICARCH or CONFIG_X86_BIGSMP.\n");
 845 #endif
 846 #endif
 847 #ifdef CONFIG_X86_LOCAL_APIC
 848         if (smp_found_config)
 849                 get_smp_config();
 850 #endif
 851
 852         e820_register_memory();
 853         e820_mark_nosave_regions();
 854
 855 #ifdef CONFIG_VT
 856 #if defined(CONFIG_VGA_CONSOLE)
 857         if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
 858                 conswitchp = &vga_con;
 859 #elif defined(CONFIG_DUMMY_CONSOLE)
 860         conswitchp = &dummy_con;
 861 #endif
 862 #endif
 863 }
 864
 865 /*
 866  * Request address space for all standard resources
 867  *
 868  * This is called just before pcibios_init(), which is also a
 869  * subsys_initcall, but is linked in later (in arch/i386/pci/common.c).
 870  */
 871 static int __init request_standard_resources(void)
 872 {
 873         int i;
 874
 875         printk(KERN_INFO "Setting up standard PCI resources\n");
 876         init_iomem_resources(&code_resource, &data_resource, &bss_resource);
 877
 878         request_resource(&iomem_resource, &video_ram_resource);
 879
 880         /* request I/O space for devices used on all i[345]86 PCs */
 881         for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
 882                 request_resource(&ioport_resource, &standard_io_resources[i]);
 883         return 0;
 884 }
 885
 886 subsys_initcall(request_standard_resources);