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, boot_params.edd_mbr_sig_buffer,
 141             sizeof(edd.mbr_signature));
 142      memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
 143      edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
 144      edd.edd_info_nr = boot_params.eddbuf_entries;
 145 }
 146 #else
 147 static inline void copy_edd(void)
 148 {
 149 }
 150 #endif
 151
 152 int __initdata user_defined_memmap = 0;
 153
 154 /*
 155  * "mem=nopentium" disables the 4MB page tables.
 156  * "mem=XXX[kKmM]" defines a memory region from HIGH_MEM
 157  * to <mem>, overriding the bios size.
 158  * "memmap=XXX[KkmM]@XXX[KkmM]" defines a memory region from
 159  * <start> to <start>+<mem>, overriding the bios size.
 160  *
 161  * HPA tells me bootloaders need to parse mem=, so no new
 162  * option should be mem=  [also see Documentation/i386/boot.txt]
 163  */
 164 static int __init parse_mem(char *arg)
 165 {
 166         if (!arg)
 167                 return -EINVAL;
 168
 169         if (strcmp(arg, "nopentium") == 0) {
 170                 clear_bit(X86_FEATURE_PSE, boot_cpu_data.x86_capability);
 171                 disable_pse = 1;
 172         } else {
 173                 /* If the user specifies memory size, we
 174                  * limit the BIOS-provided memory map to
 175                  * that size. exactmap can be used to specify
 176                  * the exact map. mem=number can be used to
 177                  * trim the existing memory map.
 178                  */
 179                 unsigned long long mem_size;
 180
 181                 mem_size = memparse(arg, &arg);
 182                 limit_regions(mem_size);
 183                 user_defined_memmap = 1;
 184         }
 185         return 0;
 186 }
 187 early_param("mem", parse_mem);
 188
 189 #ifdef CONFIG_PROC_VMCORE
 190 /* elfcorehdr= specifies the location of elf core header
 191  * stored by the crashed kernel.
 192  */
 193 static int __init parse_elfcorehdr(char *arg)
 194 {
 195         if (!arg)
 196                 return -EINVAL;
 197
 198         elfcorehdr_addr = memparse(arg, &arg);
 199         return 0;
 200 }
 201 early_param("elfcorehdr", parse_elfcorehdr);
 202 #endif /* CONFIG_PROC_VMCORE */
 203
 204 /*
 205  * highmem=size forces highmem to be exactly 'size' bytes.
 206  * This works even on boxes that have no highmem otherwise.
 207  * This also works to reduce highmem size on bigger boxes.
 208  */
 209 static int __init parse_highmem(char *arg)
 210 {
 211         if (!arg)
 212                 return -EINVAL;
 213
 214         highmem_pages = memparse(arg, &arg) >> PAGE_SHIFT;
 215         return 0;
 216 }
 217 early_param("highmem", parse_highmem);
 218
 219 /*
 220  * vmalloc=size forces the vmalloc area to be exactly 'size'
 221  * bytes. This can be used to increase (or decrease) the
 222  * vmalloc area - the default is 128m.
 223  */
 224 static int __init parse_vmalloc(char *arg)
 225 {
 226         if (!arg)
 227                 return -EINVAL;
 228
 229         __VMALLOC_RESERVE = memparse(arg, &arg);
 230         return 0;
 231 }
 232 early_param("vmalloc", parse_vmalloc);
 233
 234 /*
 235  * reservetop=size reserves a hole at the top of the kernel address space which
 236  * a hypervisor can load into later.  Needed for dynamically loaded hypervisors,
 237  * so relocating the fixmap can be done before paging initialization.
 238  */
 239 static int __init parse_reservetop(char *arg)
 240 {
 241         unsigned long address;
 242
 243         if (!arg)
 244                 return -EINVAL;
 245
 246         address = memparse(arg, &arg);
 247         reserve_top_address(address);
 248         return 0;
 249 }
 250 early_param("reservetop", parse_reservetop);
 251
 252 /*
 253  * Determine low and high memory ranges:
 254  */
 255 unsigned long __init find_max_low_pfn(void)
 256 {
 257         unsigned long max_low_pfn;
 258
 259         max_low_pfn = max_pfn;
 260         if (max_low_pfn > MAXMEM_PFN) {
 261                 if (highmem_pages == -1)
 262                         highmem_pages = max_pfn - MAXMEM_PFN;
 263                 if (highmem_pages + MAXMEM_PFN < max_pfn)
 264                         max_pfn = MAXMEM_PFN + highmem_pages;
 265                 if (highmem_pages + MAXMEM_PFN > max_pfn) {
 266                         printk("only %luMB highmem pages available, ignoring highmem size of %uMB.\n", pages_to_mb(max_pfn - MAXMEM_PFN), pages_to_mb(highmem_pages));
 267                         highmem_pages = 0;
 268                 }
 269                 max_low_pfn = MAXMEM_PFN;
 270 #ifndef CONFIG_HIGHMEM
 271                 /* Maximum memory usable is what is directly addressable */
 272                 printk(KERN_WARNING "Warning only %ldMB will be used.\n",
 273                                         MAXMEM>>20);
 274                 if (max_pfn > MAX_NONPAE_PFN)
 275                         printk(KERN_WARNING "Use a HIGHMEM64G enabled kernel.\n");
 276                 else
 277                         printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
 278                 max_pfn = MAXMEM_PFN;
 279 #else /* !CONFIG_HIGHMEM */
 280 #ifndef CONFIG_HIGHMEM64G
 281                 if (max_pfn > MAX_NONPAE_PFN) {
 282                         max_pfn = MAX_NONPAE_PFN;
 283                         printk(KERN_WARNING "Warning only 4GB will be used.\n");
 284                         printk(KERN_WARNING "Use a HIGHMEM64G enabled kernel.\n");
 285                 }
 286 #endif /* !CONFIG_HIGHMEM64G */
 287 #endif /* !CONFIG_HIGHMEM */
 288         } else {
 289                 if (highmem_pages == -1)
 290                         highmem_pages = 0;
 291 #ifdef CONFIG_HIGHMEM
 292                 if (highmem_pages >= max_pfn) {
 293                         printk(KERN_ERR "highmem size specified (%uMB) is bigger than pages available (%luMB)!.\n", pages_to_mb(highmem_pages), pages_to_mb(max_pfn));
 294                         highmem_pages = 0;
 295                 }
 296                 if (highmem_pages) {
 297                         if (max_low_pfn-highmem_pages < 64*1024*1024/PAGE_SIZE){
 298                                 printk(KERN_ERR "highmem size %uMB results in smaller than 64MB lowmem, ignoring it.\n", pages_to_mb(highmem_pages));
 299                                 highmem_pages = 0;
 300                         }
 301                         max_low_pfn -= highmem_pages;
 302                 }
 303 #else
 304                 if (highmem_pages)
 305                         printk(KERN_ERR "ignoring highmem size on non-highmem kernel!\n");
 306 #endif
 307         }
 308         return max_low_pfn;
 309 }
 310
 311 /*
 312  * workaround for Dell systems that neglect to reserve EBDA
 313  */
 314 static void __init reserve_ebda_region(void)
 315 {
 316         unsigned int addr;
 317         addr = get_bios_ebda();
 318         if (addr)
 319                 reserve_bootmem(addr, PAGE_SIZE);
 320 }
 321
 322 #ifndef CONFIG_NEED_MULTIPLE_NODES
 323 void __init setup_bootmem_allocator(void);
 324 static unsigned long __init setup_memory(void)
 325 {
 326         /*
 327          * partially used pages are not usable - thus
 328          * we are rounding upwards:
 329          */
 330         min_low_pfn = PFN_UP(init_pg_tables_end);
 331
 332         find_max_pfn();
 333
 334         max_low_pfn = find_max_low_pfn();
 335
 336 #ifdef CONFIG_HIGHMEM
 337         highstart_pfn = highend_pfn = max_pfn;
 338         if (max_pfn > max_low_pfn) {
 339                 highstart_pfn = max_low_pfn;
 340         }
 341         printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
 342                 pages_to_mb(highend_pfn - highstart_pfn));
 343         num_physpages = highend_pfn;
 344         high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1;
 345 #else
 346         num_physpages = max_low_pfn;
 347         high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1;
 348 #endif
 349 #ifdef CONFIG_FLATMEM
 350         max_mapnr = num_physpages;
 351 #endif
 352         printk(KERN_NOTICE "%ldMB LOWMEM available.\n",
 353                         pages_to_mb(max_low_pfn));
 354
 355         setup_bootmem_allocator();
 356
 357         return max_low_pfn;
 358 }
 359
 360 void __init zone_sizes_init(void)
 361 {
 362         unsigned long max_zone_pfns[MAX_NR_ZONES];
 363         memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
 364         max_zone_pfns[ZONE_DMA] =
 365                 virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
 366         max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
 367 #ifdef CONFIG_HIGHMEM
 368         max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
 369         add_active_range(0, 0, highend_pfn);
 370 #else
 371         add_active_range(0, 0, max_low_pfn);
 372 #endif
 373
 374         free_area_init_nodes(max_zone_pfns);
 375 }
 376 #else
 377 extern unsigned long __init setup_memory(void);
 378 extern void zone_sizes_init(void);
 379 #endif /* !CONFIG_NEED_MULTIPLE_NODES */
 380
 381 void __init setup_bootmem_allocator(void)
 382 {
 383         unsigned long bootmap_size;
 384         /*
 385          * Initialize the boot-time allocator (with low memory only):
 386          */
 387         bootmap_size = init_bootmem(min_low_pfn, max_low_pfn);
 388
 389         register_bootmem_low_pages(max_low_pfn);
 390
 391         /*
 392          * Reserve the bootmem bitmap itself as well. We do this in two
 393          * steps (first step was init_bootmem()) because this catches
 394          * the (very unlikely) case of us accidentally initializing the
 395          * bootmem allocator with an invalid RAM area.
 396          */
 397         reserve_bootmem(__pa_symbol(_text), (PFN_PHYS(min_low_pfn) +
 398                          bootmap_size + PAGE_SIZE-1) - __pa_symbol(_text));
 399
 400         /*
 401          * reserve physical page 0 - it's a special BIOS page on many boxes,
 402          * enabling clean reboots, SMP operation, laptop functions.
 403          */
 404         reserve_bootmem(0, PAGE_SIZE);
 405
 406         /* reserve EBDA region, it's a 4K region */
 407         reserve_ebda_region();
 408
 409     /* could be an AMD 768MPX chipset. Reserve a page  before VGA to prevent
 410        PCI prefetch into it (errata #56). Usually the page is reserved anyways,
 411        unless you have no PS/2 mouse plugged in. */
 412         if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
 413             boot_cpu_data.x86 == 6)
 414              reserve_bootmem(0xa0000 - 4096, 4096);
 415
 416 #ifdef CONFIG_SMP
 417         /*
 418          * But first pinch a few for the stack/trampoline stuff
 419          * FIXME: Don't need the extra page at 4K, but need to fix
 420          * trampoline before removing it. (see the GDT stuff)
 421          */
 422         reserve_bootmem(PAGE_SIZE, PAGE_SIZE);
 423 #endif
 424 #ifdef CONFIG_ACPI_SLEEP
 425         /*
 426          * Reserve low memory region for sleep support.
 427          */
 428         acpi_reserve_bootmem();
 429 #endif
 430 #ifdef CONFIG_X86_FIND_SMP_CONFIG
 431         /*
 432          * Find and reserve possible boot-time SMP configuration:
 433          */
 434         find_smp_config();
 435 #endif
 436         numa_kva_reserve();
 437 #ifdef CONFIG_BLK_DEV_INITRD
 438         if (boot_params.hdr.type_of_loader && boot_params.hdr.ramdisk_image) {
 439                 unsigned long ramdisk_image = boot_params.hdr.ramdisk_image;
 440                 unsigned long ramdisk_size  = boot_params.hdr.ramdisk_size;
 441                 unsigned long ramdisk_end   = ramdisk_image + ramdisk_size;
 442                 unsigned long end_of_lowmem = max_low_pfn << PAGE_SHIFT;
 443
 444                 if (ramdisk_end <= end_of_lowmem) {
 445                         reserve_bootmem(ramdisk_image, ramdisk_size);
 446                         initrd_start = ramdisk_image + PAGE_OFFSET;
 447                         initrd_end = initrd_start+ramdisk_size;
 448                 } else {
 449                         printk(KERN_ERR "initrd extends beyond end of memory "
 450                                "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 451                                ramdisk_end, end_of_lowmem);
 452                         initrd_start = 0;
 453                 }
 454         }
 455 #endif
 456 #ifdef CONFIG_KEXEC
 457         if (crashk_res.start != crashk_res.end)
 458                 reserve_bootmem(crashk_res.start,
 459                         crashk_res.end - crashk_res.start + 1);
 460 #endif
 461 }
 462
 463 /*
 464  * The node 0 pgdat is initialized before all of these because
 465  * it's needed for bootmem.  node>0 pgdats have their virtual
 466  * space allocated before the pagetables are in place to access
 467  * them, so they can't be cleared then.
 468  *
 469  * This should all compile down to nothing when NUMA is off.
 470  */
 471 static void __init remapped_pgdat_init(void)
 472 {
 473         int nid;
 474
 475         for_each_online_node(nid) {
 476                 if (nid != 0)
 477                         memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
 478         }
 479 }
 480
 481 #ifdef CONFIG_MCA
 482 static void set_mca_bus(int x)
 483 {
 484         MCA_bus = x;
 485 }
 486 #else
 487 static void set_mca_bus(int x) { }
 488 #endif
 489
 490 /* Overridden in paravirt.c if CONFIG_PARAVIRT */
 491 char * __init __attribute__((weak)) memory_setup(void)
 492 {
 493         return machine_specific_memory_setup();
 494 }
 495
 496 /*
 497  * Determine if we were loaded by an EFI loader.  If so, then we have also been
 498  * passed the efi memmap, systab, etc., so we should use these data structures
 499  * for initialization.  Note, the efi init code path is determined by the
 500  * global efi_enabled. This allows the same kernel image to be used on existing
 501  * systems (with a traditional BIOS) as well as on EFI systems.
 502  */
 503 void __init setup_arch(char **cmdline_p)
 504 {
 505         unsigned long max_low_pfn;
 506
 507         memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
 508         pre_setup_arch_hook();
 509         early_cpu_init();
 510
 511         /*
 512          * FIXME: This isn't an official loader_type right
 513          * now but does currently work with elilo.
 514          * If we were configured as an EFI kernel, check to make
 515          * sure that we were loaded correctly from elilo and that
 516          * the system table is valid.  If not, then initialize normally.
 517          */
 518 #ifdef CONFIG_EFI
 519         if ((boot_params.hdr.type_of_loader == 0x50) &&
 520             boot_params.efi_info.efi_systab)
 521                 efi_enabled = 1;
 522 #endif
 523
 524         ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
 525         screen_info = boot_params.screen_info;
 526         edid_info = boot_params.edid_info;
 527         apm_info.bios = boot_params.apm_bios_info;
 528         ist_info = boot_params.ist_info;
 529         saved_videomode = boot_params.hdr.vid_mode;
 530         if( boot_params.sys_desc_table.length != 0 ) {
 531                 set_mca_bus(boot_params.sys_desc_table.table[3] & 0x2);
 532                 machine_id = boot_params.sys_desc_table.table[0];
 533                 machine_submodel_id = boot_params.sys_desc_table.table[1];
 534                 BIOS_revision = boot_params.sys_desc_table.table[2];
 535         }
 536         bootloader_type = boot_params.hdr.type_of_loader;
 537
 538 #ifdef CONFIG_BLK_DEV_RAM
 539         rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
 540         rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
 541         rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
 542 #endif
 543         ARCH_SETUP
 544         if (efi_enabled)
 545                 efi_init();
 546         else {
 547                 printk(KERN_INFO "BIOS-provided physical RAM map:\n");
 548                 print_memory_map(memory_setup());
 549         }
 550
 551         copy_edd();
 552
 553         if (!boot_params.hdr.root_flags)
 554                 root_mountflags &= ~MS_RDONLY;
 555         init_mm.start_code = (unsigned long) _text;
 556         init_mm.end_code = (unsigned long) _etext;
 557         init_mm.end_data = (unsigned long) _edata;
 558         init_mm.brk = init_pg_tables_end + PAGE_OFFSET;
 559
 560         code_resource.start = virt_to_phys(_text);
 561         code_resource.end = virt_to_phys(_etext)-1;
 562         data_resource.start = virt_to_phys(_etext);
 563         data_resource.end = virt_to_phys(_edata)-1;
 564
 565         parse_early_param();
 566
 567         if (user_defined_memmap) {
 568                 printk(KERN_INFO "user-defined physical RAM map:\n");
 569                 print_memory_map("user");
 570         }
 571
 572         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 573         *cmdline_p = command_line;
 574
 575         max_low_pfn = setup_memory();
 576
 577 #ifdef CONFIG_VMI
 578         /*
 579          * Must be after max_low_pfn is determined, and before kernel
 580          * pagetables are setup.
 581          */
 582         vmi_init();
 583 #endif
 584
 585         /*
 586          * NOTE: before this point _nobody_ is allowed to allocate
 587          * any memory using the bootmem allocator.  Although the
 588          * alloctor is now initialised only the first 8Mb of the kernel
 589          * virtual address space has been mapped.  All allocations before
 590          * paging_init() has completed must use the alloc_bootmem_low_pages()
 591          * variant (which allocates DMA'able memory) and care must be taken
 592          * not to exceed the 8Mb limit.
 593          */
 594
 595 #ifdef CONFIG_SMP
 596         smp_alloc_memory(); /* AP processor realmode stacks in low memory*/
 597 #endif
 598         paging_init();
 599         remapped_pgdat_init();
 600         sparse_init();
 601         zone_sizes_init();
 602
 603         /*
 604          * NOTE: at this point the bootmem allocator is fully available.
 605          */
 606
 607         paravirt_post_allocator_init();
 608
 609         dmi_scan_machine();
 610
 611 #ifdef CONFIG_X86_GENERICARCH
 612         generic_apic_probe();
 613 #endif
 614         if (efi_enabled)
 615                 efi_map_memmap();
 616
 617 #ifdef CONFIG_ACPI
 618         /*
 619          * Parse the ACPI tables for possible boot-time SMP configuration.
 620          */
 621         acpi_boot_table_init();
 622 #endif
 623
 624 #ifdef CONFIG_PCI
 625         early_quirks();
 626 #endif
 627
 628 #ifdef CONFIG_ACPI
 629         acpi_boot_init();
 630
 631 #if defined(CONFIG_SMP) && defined(CONFIG_X86_PC)
 632         if (def_to_bigsmp)
 633                 printk(KERN_WARNING "More than 8 CPUs detected and "
 634                         "CONFIG_X86_PC cannot handle it.\nUse "
 635                         "CONFIG_X86_GENERICARCH or CONFIG_X86_BIGSMP.\n");
 636 #endif
 637 #endif
 638 #ifdef CONFIG_X86_LOCAL_APIC
 639         if (smp_found_config)
 640                 get_smp_config();
 641 #endif
 642
 643         e820_register_memory();
 644         e820_mark_nosave_regions();
 645
 646 #ifdef CONFIG_VT
 647 #if defined(CONFIG_VGA_CONSOLE)
 648         if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
 649                 conswitchp = &vga_con;
 650 #elif defined(CONFIG_DUMMY_CONSOLE)
 651         conswitchp = &dummy_con;
 652 #endif
 653 #endif
 654 }