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
  48 #include <video/edid.h>
  49
  50 #include <asm/apic.h>
  51 #include <asm/e820.h>
  52 #include <asm/mpspec.h>
  53 #include <asm/mmzone.h>
  54 #include <asm/setup.h>
  55 #include <asm/arch_hooks.h>
  56 #include <asm/sections.h>
  57 #include <asm/io_apic.h>
  58 #include <asm/ist.h>
  59 #include <asm/io.h>
  60 #include <asm/vmi.h>
  61 #include <setup_arch.h>
  62 #include <bios_ebda.h>
  63
  64 /* This value is set up by the early boot code to point to the value
  65    immediately after the boot time page tables.  It contains a *physical*
  66    address, and must not be in the .bss segment! */
  67 unsigned long init_pg_tables_end __initdata = ~0UL;
  68
  69 int disable_pse __devinitdata = 0;
  70
  71 /*
  72  * Machine setup..
  73  */
  74 extern struct resource code_resource;
  75 extern struct resource data_resource;
  76
  77 /* cpu data as detected by the assembly code in head.S */
  78 struct cpuinfo_x86 new_cpu_data __cpuinitdata = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
  79 /* common cpu data for all cpus */
  80 struct cpuinfo_x86 boot_cpu_data __read_mostly = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
  81 EXPORT_SYMBOL(boot_cpu_data);
  82
  83 unsigned long mmu_cr4_features;
  84
  85 /* for MCA, but anyone else can use it if they want */
  86 unsigned int machine_id;
  87 #ifdef CONFIG_MCA
  88 EXPORT_SYMBOL(machine_id);
  89 #endif
  90 unsigned int machine_submodel_id;
  91 unsigned int BIOS_revision;
  92 unsigned int mca_pentium_flag;
  93
  94 /* Boot loader ID as an integer, for the benefit of proc_dointvec */
  95 int bootloader_type;
  96
  97 /* user-defined highmem size */
  98 static unsigned int highmem_pages = -1;
  99
 100 /*
 101  * Setup options
 102  */
 103 struct screen_info screen_info;
 104 EXPORT_SYMBOL(screen_info);
 105 struct apm_info apm_info;
 106 EXPORT_SYMBOL(apm_info);
 107 struct edid_info edid_info;
 108 EXPORT_SYMBOL_GPL(edid_info);
 109 struct ist_info ist_info;
 110 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
 111         defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
 112 EXPORT_SYMBOL(ist_info);
 113 #endif
 114
 115 extern void early_cpu_init(void);
 116 extern int root_mountflags;
 117
 118 unsigned long saved_videomode;
 119
 120 #define RAMDISK_IMAGE_START_MASK        0x07FF
 121 #define RAMDISK_PROMPT_FLAG             0x8000
 122 #define RAMDISK_LOAD_FLAG               0x4000
 123
 124 static char __initdata command_line[COMMAND_LINE_SIZE];
 125
 126 struct boot_params __initdata boot_params;
 127
 128 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
 129 struct edd edd;
 130 #ifdef CONFIG_EDD_MODULE
 131 EXPORT_SYMBOL(edd);
 132 #endif
 133 /**
 134  * copy_edd() - Copy the BIOS EDD information
 135  *              from boot_params into a safe place.
 136  *
 137  */
 138 static inline void copy_edd(void)
 139 {
 140      memcpy(edd.mbr_signature, EDD_MBR_SIGNATURE, sizeof(edd.mbr_signature));
 141      memcpy(edd.edd_info, EDD_BUF, sizeof(edd.edd_info));
 142      edd.mbr_signature_nr = EDD_MBR_SIG_NR;
 143      edd.edd_info_nr = EDD_NR;
 144 }
 145 #else
 146 static inline void copy_edd(void)
 147 {
 148 }
 149 #endif
 150
 151 int __initdata user_defined_memmap = 0;
 152
 153 /*
 154  * "mem=nopentium" disables the 4MB page tables.
 155  * "mem=XXX[kKmM]" defines a memory region from HIGH_MEM
 156  * to <mem>, overriding the bios size.
 157  * "memmap=XXX[KkmM]@XXX[KkmM]" defines a memory region from
 158  * <start> to <start>+<mem>, overriding the bios size.
 159  *
 160  * HPA tells me bootloaders need to parse mem=, so no new
 161  * option should be mem=  [also see Documentation/i386/boot.txt]
 162  */
 163 static int __init parse_mem(char *arg)
 164 {
 165         if (!arg)
 166                 return -EINVAL;
 167
 168         if (strcmp(arg, "nopentium") == 0) {
 169                 clear_bit(X86_FEATURE_PSE, boot_cpu_data.x86_capability);
 170                 disable_pse = 1;
 171         } else {
 172                 /* If the user specifies memory size, we
 173                  * limit the BIOS-provided memory map to
 174                  * that size. exactmap can be used to specify
 175                  * the exact map. mem=number can be used to
 176                  * trim the existing memory map.
 177                  */
 178                 unsigned long long mem_size;
 179
 180                 mem_size = memparse(arg, &arg);
 181                 limit_regions(mem_size);
 182                 user_defined_memmap = 1;
 183         }
 184         return 0;
 185 }
 186 early_param("mem", parse_mem);
 187
 188 #ifdef CONFIG_PROC_VMCORE
 189 /* elfcorehdr= specifies the location of elf core header
 190  * stored by the crashed kernel.
 191  */
 192 static int __init parse_elfcorehdr(char *arg)
 193 {
 194         if (!arg)
 195                 return -EINVAL;
 196
 197         elfcorehdr_addr = memparse(arg, &arg);
 198         return 0;
 199 }
 200 early_param("elfcorehdr", parse_elfcorehdr);
 201 #endif /* CONFIG_PROC_VMCORE */
 202
 203 /*
 204  * highmem=size forces highmem to be exactly 'size' bytes.
 205  * This works even on boxes that have no highmem otherwise.
 206  * This also works to reduce highmem size on bigger boxes.
 207  */
 208 static int __init parse_highmem(char *arg)
 209 {
 210         if (!arg)
 211                 return -EINVAL;
 212
 213         highmem_pages = memparse(arg, &arg) >> PAGE_SHIFT;
 214         return 0;
 215 }
 216 early_param("highmem", parse_highmem);
 217
 218 /*
 219  * vmalloc=size forces the vmalloc area to be exactly 'size'
 220  * bytes. This can be used to increase (or decrease) the
 221  * vmalloc area - the default is 128m.
 222  */
 223 static int __init parse_vmalloc(char *arg)
 224 {
 225         if (!arg)
 226                 return -EINVAL;
 227
 228         __VMALLOC_RESERVE = memparse(arg, &arg);
 229         return 0;
 230 }
 231 early_param("vmalloc", parse_vmalloc);
 232
 233 /*
 234  * reservetop=size reserves a hole at the top of the kernel address space which
 235  * a hypervisor can load into later.  Needed for dynamically loaded hypervisors,
 236  * so relocating the fixmap can be done before paging initialization.
 237  */
 238 static int __init parse_reservetop(char *arg)
 239 {
 240         unsigned long address;
 241
 242         if (!arg)
 243                 return -EINVAL;
 244
 245         address = memparse(arg, &arg);
 246         reserve_top_address(address);
 247         return 0;
 248 }
 249 early_param("reservetop", parse_reservetop);
 250
 251 /*
 252  * Determine low and high memory ranges:
 253  */
 254 unsigned long __init find_max_low_pfn(void)
 255 {
 256         unsigned long max_low_pfn;
 257
 258         max_low_pfn = max_pfn;
 259         if (max_low_pfn > MAXMEM_PFN) {
 260                 if (highmem_pages == -1)
 261                         highmem_pages = max_pfn - MAXMEM_PFN;
 262                 if (highmem_pages + MAXMEM_PFN < max_pfn)
 263                         max_pfn = MAXMEM_PFN + highmem_pages;
 264                 if (highmem_pages + MAXMEM_PFN > max_pfn) {
 265                         printk("only %luMB highmem pages available, ignoring highmem size of %uMB.\n", pages_to_mb(max_pfn - MAXMEM_PFN), pages_to_mb(highmem_pages));
 266                         highmem_pages = 0;
 267                 }
 268                 max_low_pfn = MAXMEM_PFN;
 269 #ifndef CONFIG_HIGHMEM
 270                 /* Maximum memory usable is what is directly addressable */
 271                 printk(KERN_WARNING "Warning only %ldMB will be used.\n",
 272                                         MAXMEM>>20);
 273                 if (max_pfn > MAX_NONPAE_PFN)
 274                         printk(KERN_WARNING "Use a HIGHMEM64G enabled kernel.\n");
 275                 else
 276                         printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
 277                 max_pfn = MAXMEM_PFN;
 278 #else /* !CONFIG_HIGHMEM */
 279 #ifndef CONFIG_HIGHMEM64G
 280                 if (max_pfn > MAX_NONPAE_PFN) {
 281                         max_pfn = MAX_NONPAE_PFN;
 282                         printk(KERN_WARNING "Warning only 4GB will be used.\n");
 283                         printk(KERN_WARNING "Use a HIGHMEM64G enabled kernel.\n");
 284                 }
 285 #endif /* !CONFIG_HIGHMEM64G */
 286 #endif /* !CONFIG_HIGHMEM */
 287         } else {
 288                 if (highmem_pages == -1)
 289                         highmem_pages = 0;
 290 #ifdef CONFIG_HIGHMEM
 291                 if (highmem_pages >= max_pfn) {
 292                         printk(KERN_ERR "highmem size specified (%uMB) is bigger than pages available (%luMB)!.\n", pages_to_mb(highmem_pages), pages_to_mb(max_pfn));
 293                         highmem_pages = 0;
 294                 }
 295                 if (highmem_pages) {
 296                         if (max_low_pfn-highmem_pages < 64*1024*1024/PAGE_SIZE){
 297                                 printk(KERN_ERR "highmem size %uMB results in smaller than 64MB lowmem, ignoring it.\n", pages_to_mb(highmem_pages));
 298                                 highmem_pages = 0;
 299                         }
 300                         max_low_pfn -= highmem_pages;
 301                 }
 302 #else
 303                 if (highmem_pages)
 304                         printk(KERN_ERR "ignoring highmem size on non-highmem kernel!\n");
 305 #endif
 306         }
 307         return max_low_pfn;
 308 }
 309
 310 /*
 311  * workaround for Dell systems that neglect to reserve EBDA
 312  */
 313 static void __init reserve_ebda_region(void)
 314 {
 315         unsigned int addr;
 316         addr = get_bios_ebda();
 317         if (addr)
 318                 reserve_bootmem(addr, PAGE_SIZE);
 319 }
 320
 321 #ifndef CONFIG_NEED_MULTIPLE_NODES
 322 void __init setup_bootmem_allocator(void);
 323 static unsigned long __init setup_memory(void)
 324 {
 325         /*
 326          * partially used pages are not usable - thus
 327          * we are rounding upwards:
 328          */
 329         min_low_pfn = PFN_UP(init_pg_tables_end);
 330
 331         find_max_pfn();
 332
 333         max_low_pfn = find_max_low_pfn();
 334
 335 #ifdef CONFIG_HIGHMEM
 336         highstart_pfn = highend_pfn = max_pfn;
 337         if (max_pfn > max_low_pfn) {
 338                 highstart_pfn = max_low_pfn;
 339         }
 340         printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
 341                 pages_to_mb(highend_pfn - highstart_pfn));
 342         num_physpages = highend_pfn;
 343         high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1;
 344 #else
 345         num_physpages = max_low_pfn;
 346         high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1;
 347 #endif
 348 #ifdef CONFIG_FLATMEM
 349         max_mapnr = num_physpages;
 350 #endif
 351         printk(KERN_NOTICE "%ldMB LOWMEM available.\n",
 352                         pages_to_mb(max_low_pfn));
 353
 354         setup_bootmem_allocator();
 355
 356         return max_low_pfn;
 357 }
 358
 359 void __init zone_sizes_init(void)
 360 {
 361         unsigned long max_zone_pfns[MAX_NR_ZONES];
 362         memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
 363         max_zone_pfns[ZONE_DMA] =
 364                 virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
 365         max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
 366 #ifdef CONFIG_HIGHMEM
 367         max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
 368         add_active_range(0, 0, highend_pfn);
 369 #else
 370         add_active_range(0, 0, max_low_pfn);
 371 #endif
 372
 373         free_area_init_nodes(max_zone_pfns);
 374 }
 375 #else
 376 extern unsigned long __init setup_memory(void);
 377 extern void zone_sizes_init(void);
 378 #endif /* !CONFIG_NEED_MULTIPLE_NODES */
 379
 380 void __init setup_bootmem_allocator(void)
 381 {
 382         unsigned long bootmap_size;
 383         /*
 384          * Initialize the boot-time allocator (with low memory only):
 385          */
 386         bootmap_size = init_bootmem(min_low_pfn, max_low_pfn);
 387
 388         register_bootmem_low_pages(max_low_pfn);
 389
 390         /*
 391          * Reserve the bootmem bitmap itself as well. We do this in two
 392          * steps (first step was init_bootmem()) because this catches
 393          * the (very unlikely) case of us accidentally initializing the
 394          * bootmem allocator with an invalid RAM area.
 395          */
 396         reserve_bootmem(__pa_symbol(_text), (PFN_PHYS(min_low_pfn) +
 397                          bootmap_size + PAGE_SIZE-1) - __pa_symbol(_text));
 398
 399         /*
 400          * reserve physical page 0 - it's a special BIOS page on many boxes,
 401          * enabling clean reboots, SMP operation, laptop functions.
 402          */
 403         reserve_bootmem(0, PAGE_SIZE);
 404
 405         /* reserve EBDA region, it's a 4K region */
 406         reserve_ebda_region();
 407
 408     /* could be an AMD 768MPX chipset. Reserve a page  before VGA to prevent
 409        PCI prefetch into it (errata #56). Usually the page is reserved anyways,
 410        unless you have no PS/2 mouse plugged in. */
 411         if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
 412             boot_cpu_data.x86 == 6)
 413              reserve_bootmem(0xa0000 - 4096, 4096);
 414
 415 #ifdef CONFIG_SMP
 416         /*
 417          * But first pinch a few for the stack/trampoline stuff
 418          * FIXME: Don't need the extra page at 4K, but need to fix
 419          * trampoline before removing it. (see the GDT stuff)
 420          */
 421         reserve_bootmem(PAGE_SIZE, PAGE_SIZE);
 422 #endif
 423 #ifdef CONFIG_ACPI_SLEEP
 424         /*
 425          * Reserve low memory region for sleep support.
 426          */
 427         acpi_reserve_bootmem();
 428 #endif
 429 #ifdef CONFIG_X86_FIND_SMP_CONFIG
 430         /*
 431          * Find and reserve possible boot-time SMP configuration:
 432          */
 433         find_smp_config();
 434 #endif
 435         numa_kva_reserve();
 436 #ifdef CONFIG_BLK_DEV_INITRD
 437         if (LOADER_TYPE && INITRD_START) {
 438                 if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
 439                         reserve_bootmem(INITRD_START, INITRD_SIZE);
 440                         initrd_start = INITRD_START + PAGE_OFFSET;
 441                         initrd_end = initrd_start+INITRD_SIZE;
 442                 }
 443                 else {
 444                         printk(KERN_ERR "initrd extends beyond end of memory "
 445                             "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 446                             INITRD_START + INITRD_SIZE,
 447                             max_low_pfn << PAGE_SHIFT);
 448                         initrd_start = 0;
 449                 }
 450         }
 451 #endif
 452 #ifdef CONFIG_KEXEC
 453         if (crashk_res.start != crashk_res.end)
 454                 reserve_bootmem(crashk_res.start,
 455                         crashk_res.end - crashk_res.start + 1);
 456 #endif
 457 }
 458
 459 /*
 460  * The node 0 pgdat is initialized before all of these because
 461  * it's needed for bootmem.  node>0 pgdats have their virtual
 462  * space allocated before the pagetables are in place to access
 463  * them, so they can't be cleared then.
 464  *
 465  * This should all compile down to nothing when NUMA is off.
 466  */
 467 static void __init remapped_pgdat_init(void)
 468 {
 469         int nid;
 470
 471         for_each_online_node(nid) {
 472                 if (nid != 0)
 473                         memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
 474         }
 475 }
 476
 477 #ifdef CONFIG_MCA
 478 static void set_mca_bus(int x)
 479 {
 480         MCA_bus = x;
 481 }
 482 #else
 483 static void set_mca_bus(int x) { }
 484 #endif
 485
 486 /* Overridden in paravirt.c if CONFIG_PARAVIRT */
 487 char * __init __attribute__((weak)) memory_setup(void)
 488 {
 489         return machine_specific_memory_setup();
 490 }
 491
 492 /*
 493  * Determine if we were loaded by an EFI loader.  If so, then we have also been
 494  * passed the efi memmap, systab, etc., so we should use these data structures
 495  * for initialization.  Note, the efi init code path is determined by the
 496  * global efi_enabled. This allows the same kernel image to be used on existing
 497  * systems (with a traditional BIOS) as well as on EFI systems.
 498  */
 499 void __init setup_arch(char **cmdline_p)
 500 {
 501         unsigned long max_low_pfn;
 502
 503         memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
 504         pre_setup_arch_hook();
 505         early_cpu_init();
 506
 507         /*
 508          * FIXME: This isn't an official loader_type right
 509          * now but does currently work with elilo.
 510          * If we were configured as an EFI kernel, check to make
 511          * sure that we were loaded correctly from elilo and that
 512          * the system table is valid.  If not, then initialize normally.
 513          */
 514 #ifdef CONFIG_EFI
 515         if ((LOADER_TYPE == 0x50) && EFI_SYSTAB)
 516                 efi_enabled = 1;
 517 #endif
 518
 519         ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
 520         screen_info = SCREEN_INFO;
 521         edid_info = EDID_INFO;
 522         apm_info.bios = APM_BIOS_INFO;
 523         ist_info = IST_INFO;
 524         saved_videomode = VIDEO_MODE;
 525         if( SYS_DESC_TABLE.length != 0 ) {
 526                 set_mca_bus(SYS_DESC_TABLE.table[3] & 0x2);
 527                 machine_id = SYS_DESC_TABLE.table[0];
 528                 machine_submodel_id = SYS_DESC_TABLE.table[1];
 529                 BIOS_revision = SYS_DESC_TABLE.table[2];
 530         }
 531         bootloader_type = LOADER_TYPE;
 532
 533 #ifdef CONFIG_BLK_DEV_RAM
 534         rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
 535         rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
 536         rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
 537 #endif
 538         ARCH_SETUP
 539         if (efi_enabled)
 540                 efi_init();
 541         else {
 542                 printk(KERN_INFO "BIOS-provided physical RAM map:\n");
 543                 print_memory_map(memory_setup());
 544         }
 545
 546         copy_edd();
 547
 548         if (!MOUNT_ROOT_RDONLY)
 549                 root_mountflags &= ~MS_RDONLY;
 550         init_mm.start_code = (unsigned long) _text;
 551         init_mm.end_code = (unsigned long) _etext;
 552         init_mm.end_data = (unsigned long) _edata;
 553         init_mm.brk = init_pg_tables_end + PAGE_OFFSET;
 554
 555         code_resource.start = virt_to_phys(_text);
 556         code_resource.end = virt_to_phys(_etext)-1;
 557         data_resource.start = virt_to_phys(_etext);
 558         data_resource.end = virt_to_phys(_edata)-1;
 559
 560         parse_early_param();
 561
 562         if (user_defined_memmap) {
 563                 printk(KERN_INFO "user-defined physical RAM map:\n");
 564                 print_memory_map("user");
 565         }
 566
 567         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 568         *cmdline_p = command_line;
 569
 570         max_low_pfn = setup_memory();
 571
 572 #ifdef CONFIG_VMI
 573         /*
 574          * Must be after max_low_pfn is determined, and before kernel
 575          * pagetables are setup.
 576          */
 577         vmi_init();
 578 #endif
 579
 580         /*
 581          * NOTE: before this point _nobody_ is allowed to allocate
 582          * any memory using the bootmem allocator.  Although the
 583          * alloctor is now initialised only the first 8Mb of the kernel
 584          * virtual address space has been mapped.  All allocations before
 585          * paging_init() has completed must use the alloc_bootmem_low_pages()
 586          * variant (which allocates DMA'able memory) and care must be taken
 587          * not to exceed the 8Mb limit.
 588          */
 589
 590 #ifdef CONFIG_SMP
 591         smp_alloc_memory(); /* AP processor realmode stacks in low memory*/
 592 #endif
 593         paging_init();
 594         remapped_pgdat_init();
 595         sparse_init();
 596         zone_sizes_init();
 597
 598         /*
 599          * NOTE: at this point the bootmem allocator is fully available.
 600          */
 601
 602         paravirt_post_allocator_init();
 603
 604         dmi_scan_machine();
 605
 606 #ifdef CONFIG_X86_GENERICARCH
 607         generic_apic_probe();
 608 #endif
 609         if (efi_enabled)
 610                 efi_map_memmap();
 611
 612 #ifdef CONFIG_ACPI
 613         /*
 614          * Parse the ACPI tables for possible boot-time SMP configuration.
 615          */
 616         acpi_boot_table_init();
 617 #endif
 618
 619 #ifdef CONFIG_PCI
 620 #ifdef CONFIG_X86_IO_APIC
 621         check_acpi_pci();       /* Checks more than just ACPI actually */
 622 #endif
 623 #endif
 624
 625 #ifdef CONFIG_ACPI
 626         acpi_boot_init();
 627
 628 #if defined(CONFIG_SMP) && defined(CONFIG_X86_PC)
 629         if (def_to_bigsmp)
 630                 printk(KERN_WARNING "More than 8 CPUs detected and "
 631                         "CONFIG_X86_PC cannot handle it.\nUse "
 632                         "CONFIG_X86_GENERICARCH or CONFIG_X86_BIGSMP.\n");
 633 #endif
 634 #endif
 635 #ifdef CONFIG_X86_LOCAL_APIC
 636         if (smp_found_config)
 637                 get_smp_config();
 638 #endif
 639
 640         e820_register_memory();
 641         e820_mark_nosave_regions();
 642
 643 #ifdef CONFIG_VT
 644 #if defined(CONFIG_VGA_CONSOLE)
 645         if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
 646                 conswitchp = &vga_con;
 647 #elif defined(CONFIG_DUMMY_CONSOLE)
 648         conswitchp = &dummy_con;
 649 #endif
 650 #endif
 651 }