release/src-rt-6.x/linux/linux-2.6/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/mmzone.h>
  29 #include <linux/screen_info.h>
  30 #include <linux/ioport.h>
  31 #include <linux/acpi.h>
  32 #include <linux/apm_bios.h>
  33 #include <linux/initrd.h>
  34 #include <linux/bootmem.h>
  35 #include <linux/seq_file.h>
  36 #include <linux/console.h>
  37 #include <linux/mca.h>
  38 #include <linux/root_dev.h>
  39 #include <linux/highmem.h>
  40 #include <linux/module.h>
  41 #include <linux/efi.h>
  42 #include <linux/init.h>
  43 #include <linux/edd.h>
  44 #include <linux/nodemask.h>
  45 #include <linux/kexec.h>
  46 #include <linux/crash_dump.h>
  47 #include <linux/dmi.h>
  48 #include <linux/pfn.h>
  49
  50 #include <video/edid.h>
  51
  52 #include <asm/apic.h>
  53 #include <asm/e820.h>
  54 #include <asm/mpspec.h>
  55 #include <asm/mmzone.h>
  56 #include <asm/setup.h>
  57 #include <asm/arch_hooks.h>
  58 #include <asm/sections.h>
  59 #include <asm/io_apic.h>
  60 #include <asm/ist.h>
  61 #include <asm/io.h>
  62 #include <asm/vmi.h>
  63 #include <setup_arch.h>
  64 #include <bios_ebda.h>
  65
  66 /* This value is set up by the early boot code to point to the value
  67    immediately after the boot time page tables.  It contains a *physical*
  68    address, and must not be in the .bss segment! */
  69 unsigned long init_pg_tables_end __initdata = ~0UL;
  70
  71 int disable_pse __devinitdata = 0;
  72
  73 /*
  74  * Machine setup..
  75  */
  76 extern struct resource code_resource;
  77 extern struct resource data_resource;
  78
  79 /* cpu data as detected by the assembly code in head.S */
  80 struct cpuinfo_x86 new_cpu_data __cpuinitdata = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
  81 /* common cpu data for all cpus */
  82 struct cpuinfo_x86 boot_cpu_data __read_mostly = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
  83 EXPORT_SYMBOL(boot_cpu_data);
  84
  85 unsigned long mmu_cr4_features;
  86
  87 /* for MCA, but anyone else can use it if they want */
  88 unsigned int machine_id;
  89 #ifdef CONFIG_MCA
  90 EXPORT_SYMBOL(machine_id);
  91 #endif
  92 unsigned int machine_submodel_id;
  93 unsigned int BIOS_revision;
  94 unsigned int mca_pentium_flag;
  95
  96 /* Boot loader ID as an integer, for the benefit of proc_dointvec */
  97 int bootloader_type;
  98
  99 /* user-defined highmem size */
 100 static unsigned int highmem_pages = -1;
 101
 102 /*
 103  * Setup options
 104  */
 105 struct drive_info_struct { char dummy[32]; } drive_info;
 106 #if defined(CONFIG_BLK_DEV_IDE) || defined(CONFIG_BLK_DEV_HD) || \
 107     defined(CONFIG_BLK_DEV_IDE_MODULE) || defined(CONFIG_BLK_DEV_HD_MODULE)
 108 EXPORT_SYMBOL(drive_info);
 109 #endif
 110 struct screen_info screen_info;
 111 EXPORT_SYMBOL(screen_info);
 112 struct apm_info apm_info;
 113 EXPORT_SYMBOL(apm_info);
 114 struct sys_desc_table_struct {
 115         unsigned short length;
 116         unsigned char table[0];
 117 };
 118 struct edid_info edid_info;
 119 EXPORT_SYMBOL_GPL(edid_info);
 120 struct ist_info ist_info;
 121 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
 122         defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
 123 EXPORT_SYMBOL(ist_info);
 124 #endif
 125
 126 extern void early_cpu_init(void);
 127 extern int root_mountflags;
 128
 129 unsigned long saved_videomode;
 130
 131 #define RAMDISK_IMAGE_START_MASK        0x07FF
 132 #define RAMDISK_PROMPT_FLAG             0x8000
 133 #define RAMDISK_LOAD_FLAG               0x4000
 134
 135 static char __initdata command_line[COMMAND_LINE_SIZE];
 136
 137 unsigned char __initdata boot_params[PARAM_SIZE];
 138
 139 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
 140 struct edd edd;
 141 #ifdef CONFIG_EDD_MODULE
 142 EXPORT_SYMBOL(edd);
 143 #endif
 144 /**
 145  * copy_edd() - Copy the BIOS EDD information
 146  *              from boot_params into a safe place.
 147  *
 148  */
 149 static inline void copy_edd(void)
 150 {
 151      memcpy(edd.mbr_signature, EDD_MBR_SIGNATURE, sizeof(edd.mbr_signature));
 152      memcpy(edd.edd_info, EDD_BUF, sizeof(edd.edd_info));
 153      edd.mbr_signature_nr = EDD_MBR_SIG_NR;
 154      edd.edd_info_nr = EDD_NR;
 155 }
 156 #else
 157 static inline void copy_edd(void)
 158 {
 159 }
 160 #endif
 161
 162 int __initdata user_defined_memmap = 0;
 163
 164 /*
 165  * "mem=nopentium" disables the 4MB page tables.
 166  * "mem=XXX[kKmM]" defines a memory region from HIGH_MEM
 167  * to <mem>, overriding the bios size.
 168  * "memmap=XXX[KkmM]@XXX[KkmM]" defines a memory region from
 169  * <start> to <start>+<mem>, overriding the bios size.
 170  *
 171  * HPA tells me bootloaders need to parse mem=, so no new
 172  * option should be mem=  [also see Documentation/i386/boot.txt]
 173  */
 174 static int __init parse_mem(char *arg)
 175 {
 176         if (!arg)
 177                 return -EINVAL;
 178
 179         if (strcmp(arg, "nopentium") == 0) {
 180                 clear_bit(X86_FEATURE_PSE, boot_cpu_data.x86_capability);
 181                 disable_pse = 1;
 182         } else {
 183                 /* If the user specifies memory size, we
 184                  * limit the BIOS-provided memory map to
 185                  * that size. exactmap can be used to specify
 186                  * the exact map. mem=number can be used to
 187                  * trim the existing memory map.
 188                  */
 189                 unsigned long long mem_size;
 190
 191                 mem_size = memparse(arg, &arg);
 192                 limit_regions(mem_size);
 193                 user_defined_memmap = 1;
 194         }
 195         return 0;
 196 }
 197 early_param("mem", parse_mem);
 198
 199 #ifdef CONFIG_PROC_VMCORE
 200 /* elfcorehdr= specifies the location of elf core header
 201  * stored by the crashed kernel.
 202  */
 203 static int __init parse_elfcorehdr(char *arg)
 204 {
 205         if (!arg)
 206                 return -EINVAL;
 207
 208         elfcorehdr_addr = memparse(arg, &arg);
 209         return 0;
 210 }
 211 early_param("elfcorehdr", parse_elfcorehdr);
 212 #endif /* CONFIG_PROC_VMCORE */
 213
 214 /*
 215  * highmem=size forces highmem to be exactly 'size' bytes.
 216  * This works even on boxes that have no highmem otherwise.
 217  * This also works to reduce highmem size on bigger boxes.
 218  */
 219 static int __init parse_highmem(char *arg)
 220 {
 221         if (!arg)
 222                 return -EINVAL;
 223
 224         highmem_pages = memparse(arg, &arg) >> PAGE_SHIFT;
 225         return 0;
 226 }
 227 early_param("highmem", parse_highmem);
 228
 229 /*
 230  * vmalloc=size forces the vmalloc area to be exactly 'size'
 231  * bytes. This can be used to increase (or decrease) the
 232  * vmalloc area - the default is 128m.
 233  */
 234 static int __init parse_vmalloc(char *arg)
 235 {
 236         if (!arg)
 237                 return -EINVAL;
 238
 239         __VMALLOC_RESERVE = memparse(arg, &arg);
 240         return 0;
 241 }
 242 early_param("vmalloc", parse_vmalloc);
 243
 244 /*
 245  * reservetop=size reserves a hole at the top of the kernel address space which
 246  * a hypervisor can load into later.  Needed for dynamically loaded hypervisors,
 247  * so relocating the fixmap can be done before paging initialization.
 248  */
 249 static int __init parse_reservetop(char *arg)
 250 {
 251         unsigned long address;
 252
 253         if (!arg)
 254                 return -EINVAL;
 255
 256         address = memparse(arg, &arg);
 257         reserve_top_address(address);
 258         return 0;
 259 }
 260 early_param("reservetop", parse_reservetop);
 261
 262 /*
 263  * Determine low and high memory ranges:
 264  */
 265 unsigned long __init find_max_low_pfn(void)
 266 {
 267         unsigned long max_low_pfn;
 268
 269         max_low_pfn = max_pfn;
 270         if (max_low_pfn > MAXMEM_PFN) {
 271                 if (highmem_pages == -1)
 272                         highmem_pages = max_pfn - MAXMEM_PFN;
 273                 if (highmem_pages + MAXMEM_PFN < max_pfn)
 274                         max_pfn = MAXMEM_PFN + highmem_pages;
 275                 if (highmem_pages + MAXMEM_PFN > max_pfn) {
 276                         printk("only %luMB highmem pages available, ignoring highmem size of %uMB.\n", pages_to_mb(max_pfn - MAXMEM_PFN), pages_to_mb(highmem_pages));
 277                         highmem_pages = 0;
 278                 }
 279                 max_low_pfn = MAXMEM_PFN;
 280 #ifndef CONFIG_HIGHMEM
 281                 /* Maximum memory usable is what is directly addressable */
 282                 printk(KERN_WARNING "Warning only %ldMB will be used.\n",
 283                                         MAXMEM>>20);
 284                 if (max_pfn > MAX_NONPAE_PFN)
 285                         printk(KERN_WARNING "Use a PAE enabled kernel.\n");
 286                 else
 287                         printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
 288                 max_pfn = MAXMEM_PFN;
 289 #else /* !CONFIG_HIGHMEM */
 290 #ifndef CONFIG_X86_PAE
 291                 if (max_pfn > MAX_NONPAE_PFN) {
 292                         max_pfn = MAX_NONPAE_PFN;
 293                         printk(KERN_WARNING "Warning only 4GB will be used.\n");
 294                         printk(KERN_WARNING "Use a PAE enabled kernel.\n");
 295                 }
 296 #endif /* !CONFIG_X86_PAE */
 297 #endif /* !CONFIG_HIGHMEM */
 298         } else {
 299                 if (highmem_pages == -1)
 300                         highmem_pages = 0;
 301 #ifdef CONFIG_HIGHMEM
 302                 if (highmem_pages >= max_pfn) {
 303                         printk(KERN_ERR "highmem size specified (%uMB) is bigger than pages available (%luMB)!.\n", pages_to_mb(highmem_pages), pages_to_mb(max_pfn));
 304                         highmem_pages = 0;
 305                 }
 306                 if (highmem_pages) {
 307                         if (max_low_pfn-highmem_pages < 64*1024*1024/PAGE_SIZE){
 308                                 printk(KERN_ERR "highmem size %uMB results in smaller than 64MB lowmem, ignoring it.\n", pages_to_mb(highmem_pages));
 309                                 highmem_pages = 0;
 310                         }
 311                         max_low_pfn -= highmem_pages;
 312                 }
 313 #else
 314                 if (highmem_pages)
 315                         printk(KERN_ERR "ignoring highmem size on non-highmem kernel!\n");
 316 #endif
 317         }
 318         return max_low_pfn;
 319 }
 320
 321 /*
 322  * workaround for Dell systems that neglect to reserve EBDA
 323  */
 324 static void __init reserve_ebda_region(void)
 325 {
 326         unsigned int addr;
 327         addr = get_bios_ebda();
 328         if (addr)
 329                 reserve_bootmem(addr, PAGE_SIZE);
 330 }
 331
 332 #ifndef CONFIG_NEED_MULTIPLE_NODES
 333 void __init setup_bootmem_allocator(void);
 334 static unsigned long __init setup_memory(void)
 335 {
 336         /*
 337          * partially used pages are not usable - thus
 338          * we are rounding upwards:
 339          */
 340         min_low_pfn = PFN_UP(init_pg_tables_end);
 341
 342         find_max_pfn();
 343
 344         max_low_pfn = find_max_low_pfn();
 345
 346 #ifdef CONFIG_HIGHMEM
 347         highstart_pfn = highend_pfn = max_pfn;
 348         if (max_pfn > max_low_pfn) {
 349                 highstart_pfn = max_low_pfn;
 350         }
 351         printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
 352                 pages_to_mb(highend_pfn - highstart_pfn));
 353         num_physpages = highend_pfn;
 354         high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1;
 355 #else
 356         num_physpages = max_low_pfn;
 357         high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1;
 358 #endif
 359 #ifdef CONFIG_FLATMEM
 360         max_mapnr = num_physpages;
 361 #endif
 362         printk(KERN_NOTICE "%ldMB LOWMEM available.\n",
 363                         pages_to_mb(max_low_pfn));
 364
 365         setup_bootmem_allocator();
 366
 367         return max_low_pfn;
 368 }
 369
 370 void __init zone_sizes_init(void)
 371 {
 372         unsigned long max_zone_pfns[MAX_NR_ZONES];
 373         memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
 374         max_zone_pfns[ZONE_DMA] =
 375                 virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
 376         max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
 377 #ifdef CONFIG_HIGHMEM
 378         max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
 379         add_active_range(0, 0, highend_pfn);
 380 #else
 381         add_active_range(0, 0, max_low_pfn);
 382 #endif
 383
 384         free_area_init_nodes(max_zone_pfns);
 385 }
 386 #else
 387 extern unsigned long __init setup_memory(void);
 388 extern void zone_sizes_init(void);
 389 #endif /* !CONFIG_NEED_MULTIPLE_NODES */
 390
 391 void __init setup_bootmem_allocator(void)
 392 {
 393         unsigned long bootmap_size;
 394         /*
 395          * Initialize the boot-time allocator (with low memory only):
 396          */
 397         bootmap_size = init_bootmem(min_low_pfn, max_low_pfn);
 398
 399         register_bootmem_low_pages(max_low_pfn);
 400
 401         /*
 402          * Reserve the bootmem bitmap itself as well. We do this in two
 403          * steps (first step was init_bootmem()) because this catches
 404          * the (very unlikely) case of us accidentally initializing the
 405          * bootmem allocator with an invalid RAM area.
 406          */
 407         reserve_bootmem(__pa_symbol(_text), (PFN_PHYS(min_low_pfn) +
 408                          bootmap_size + PAGE_SIZE-1) - __pa_symbol(_text));
 409
 410         /*
 411          * reserve physical page 0 - it's a special BIOS page on many boxes,
 412          * enabling clean reboots, SMP operation, laptop functions.
 413          */
 414         reserve_bootmem(0, PAGE_SIZE);
 415
 416         /* reserve EBDA region, it's a 4K region */
 417         reserve_ebda_region();
 418
 419     /* could be an AMD 768MPX chipset. Reserve a page  before VGA to prevent
 420        PCI prefetch into it (errata #56). Usually the page is reserved anyways,
 421        unless you have no PS/2 mouse plugged in. */
 422         if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
 423             boot_cpu_data.x86 == 6)
 424              reserve_bootmem(0xa0000 - 4096, 4096);
 425
 426 #ifdef CONFIG_SMP
 427         /*
 428          * But first pinch a few for the stack/trampoline stuff
 429          * FIXME: Don't need the extra page at 4K, but need to fix
 430          * trampoline before removing it. (see the GDT stuff)
 431          */
 432         reserve_bootmem(PAGE_SIZE, PAGE_SIZE);
 433 #endif
 434 #ifdef CONFIG_ACPI_SLEEP
 435         /*
 436          * Reserve low memory region for sleep support.
 437          */
 438         acpi_reserve_bootmem();
 439 #endif
 440 #ifdef CONFIG_X86_FIND_SMP_CONFIG
 441         /*
 442          * Find and reserve possible boot-time SMP configuration:
 443          */
 444         find_smp_config();
 445 #endif
 446         numa_kva_reserve();
 447 #ifdef CONFIG_BLK_DEV_INITRD
 448         if (LOADER_TYPE && INITRD_START) {
 449                 if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
 450                         reserve_bootmem(INITRD_START, INITRD_SIZE);
 451                         initrd_start = INITRD_START + PAGE_OFFSET;
 452                         initrd_end = initrd_start+INITRD_SIZE;
 453                 }
 454                 else {
 455                         printk(KERN_ERR "initrd extends beyond end of memory "
 456                             "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 457                             INITRD_START + INITRD_SIZE,
 458                             max_low_pfn << PAGE_SHIFT);
 459                         initrd_start = 0;
 460                 }
 461         }
 462 #endif
 463 #ifdef CONFIG_KEXEC
 464         if (crashk_res.start != crashk_res.end)
 465                 reserve_bootmem(crashk_res.start,
 466                         crashk_res.end - crashk_res.start + 1);
 467 #endif
 468 }
 469
 470 /*
 471  * The node 0 pgdat is initialized before all of these because
 472  * it's needed for bootmem.  node>0 pgdats have their virtual
 473  * space allocated before the pagetables are in place to access
 474  * them, so they can't be cleared then.
 475  *
 476  * This should all compile down to nothing when NUMA is off.
 477  */
 478 void __init remapped_pgdat_init(void)
 479 {
 480         int nid;
 481
 482         for_each_online_node(nid) {
 483                 if (nid != 0)
 484                         memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
 485         }
 486 }
 487
 488 #ifdef CONFIG_MCA
 489 static void set_mca_bus(int x)
 490 {
 491         MCA_bus = x;
 492 }
 493 #else
 494 static void set_mca_bus(int x) { }
 495 #endif
 496
 497 /* Overridden in paravirt.c if CONFIG_PARAVIRT */
 498 char * __init __attribute__((weak)) memory_setup(void)
 499 {
 500         return machine_specific_memory_setup();
 501 }
 502
 503 /*
 504  * Determine if we were loaded by an EFI loader.  If so, then we have also been
 505  * passed the efi memmap, systab, etc., so we should use these data structures
 506  * for initialization.  Note, the efi init code path is determined by the
 507  * global efi_enabled. This allows the same kernel image to be used on existing
 508  * systems (with a traditional BIOS) as well as on EFI systems.
 509  */
 510 void __init setup_arch(char **cmdline_p)
 511 {
 512         unsigned long max_low_pfn;
 513
 514         memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
 515         pre_setup_arch_hook();
 516         early_cpu_init();
 517
 518         /*
 519          * FIXME: This isn't an official loader_type right
 520          * now but does currently work with elilo.
 521          * If we were configured as an EFI kernel, check to make
 522          * sure that we were loaded correctly from elilo and that
 523          * the system table is valid.  If not, then initialize normally.
 524          */
 525 #ifdef CONFIG_EFI
 526         if ((LOADER_TYPE == 0x50) && EFI_SYSTAB)
 527                 efi_enabled = 1;
 528 #endif
 529
 530         ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
 531         drive_info = DRIVE_INFO;
 532         screen_info = SCREEN_INFO;
 533         edid_info = EDID_INFO;
 534         apm_info.bios = APM_BIOS_INFO;
 535         ist_info = IST_INFO;
 536         saved_videomode = VIDEO_MODE;
 537         if( SYS_DESC_TABLE.length != 0 ) {
 538                 set_mca_bus(SYS_DESC_TABLE.table[3] & 0x2);
 539                 machine_id = SYS_DESC_TABLE.table[0];
 540                 machine_submodel_id = SYS_DESC_TABLE.table[1];
 541                 BIOS_revision = SYS_DESC_TABLE.table[2];
 542         }
 543         bootloader_type = LOADER_TYPE;
 544
 545 #ifdef CONFIG_BLK_DEV_RAM
 546         rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
 547         rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
 548         rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
 549 #endif
 550         ARCH_SETUP
 551         if (efi_enabled)
 552                 efi_init();
 553         else {
 554                 printk(KERN_INFO "BIOS-provided physical RAM map:\n");
 555                 print_memory_map(memory_setup());
 556         }
 557
 558         copy_edd();
 559
 560         if (!MOUNT_ROOT_RDONLY)
 561                 root_mountflags &= ~MS_RDONLY;
 562         init_mm.start_code = (unsigned long) _text;
 563         init_mm.end_code = (unsigned long) _etext;
 564         init_mm.end_data = (unsigned long) _edata;
 565         init_mm.brk = init_pg_tables_end + PAGE_OFFSET;
 566
 567         code_resource.start = virt_to_phys(_text);
 568         code_resource.end = virt_to_phys(_etext)-1;
 569         data_resource.start = virt_to_phys(_etext);
 570         data_resource.end = virt_to_phys(_edata)-1;
 571
 572         parse_early_param();
 573
 574         if (user_defined_memmap) {
 575                 printk(KERN_INFO "user-defined physical RAM map:\n");
 576                 print_memory_map("user");
 577         }
 578
 579         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 580         *cmdline_p = command_line;
 581
 582         max_low_pfn = setup_memory();
 583
 584 #ifdef CONFIG_VMI
 585         /*
 586          * Must be after max_low_pfn is determined, and before kernel
 587          * pagetables are setup.
 588          */
 589         vmi_init();
 590 #endif
 591
 592         /*
 593          * NOTE: before this point _nobody_ is allowed to allocate
 594          * any memory using the bootmem allocator.  Although the
 595          * alloctor is now initialised only the first 8Mb of the kernel
 596          * virtual address space has been mapped.  All allocations before
 597          * paging_init() has completed must use the alloc_bootmem_low_pages()
 598          * variant (which allocates DMA'able memory) and care must be taken
 599          * not to exceed the 8Mb limit.
 600          */
 601
 602 #ifdef CONFIG_SMP
 603         smp_alloc_memory(); /* AP processor realmode stacks in low memory*/
 604 #endif
 605         paging_init();
 606         remapped_pgdat_init();
 607         sparse_init();
 608         zone_sizes_init();
 609
 610         /*
 611          * NOTE: at this point the bootmem allocator is fully available.
 612          */
 613
 614         dmi_scan_machine();
 615
 616 #ifdef CONFIG_X86_GENERICARCH
 617         generic_apic_probe();
 618 #endif
 619         if (efi_enabled)
 620                 efi_map_memmap();
 621
 622 #ifdef CONFIG_ACPI
 623         /*
 624          * Parse the ACPI tables for possible boot-time SMP configuration.
 625          */
 626         acpi_boot_table_init();
 627 #endif
 628
 629 #ifdef CONFIG_PCI
 630 #ifdef CONFIG_X86_IO_APIC
 631         check_acpi_pci();       /* Checks more than just ACPI actually */
 632 #endif
 633 #endif
 634
 635 #ifdef CONFIG_ACPI
 636         acpi_boot_init();
 637
 638 #if defined(CONFIG_SMP) && defined(CONFIG_X86_PC)
 639         if (def_to_bigsmp)
 640                 printk(KERN_WARNING "More than 8 CPUs detected and "
 641                         "CONFIG_X86_PC cannot handle it.\nUse "
 642                         "CONFIG_X86_GENERICARCH or CONFIG_X86_BIGSMP.\n");
 643 #endif
 644 #endif
 645 #ifdef CONFIG_X86_LOCAL_APIC
 646         if (smp_found_config)
 647                 get_smp_config();
 648 #endif
 649
 650         e820_register_memory();
 651
 652 #ifdef CONFIG_VT
 653 #if defined(CONFIG_VGA_CONSOLE)
 654         if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
 655                 conswitchp = &vga_con;
 656 #elif defined(CONFIG_DUMMY_CONSOLE)
 657         conswitchp = &dummy_con;
 658 #endif
 659 #endif
 660 }