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/platform_device.h>
  37 #include <linux/console.h>
  38 #include <linux/mca.h>
  39 #include <linux/root_dev.h>
  40 #include <linux/highmem.h>
  41 #include <linux/module.h>
  42 #include <linux/efi.h>
  43 #include <linux/init.h>
  44 #include <linux/edd.h>
  45 #include <linux/nodemask.h>
  46 #include <linux/kexec.h>
  47 #include <linux/crash_dump.h>
  48 #include <linux/dmi.h>
  49 #include <linux/pfn.h>
  50
  51 #include <video/edid.h>
  52
  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
  67 /* This value is set up by the early boot code to point to the value
  68    immediately after the boot time page tables.  It contains a *physical*
  69    address, and must not be in the .bss segment! */
  70 unsigned long init_pg_tables_end __initdata = ~0UL;
  71
  72 int disable_pse __devinitdata = 0;
  73
  74 /*
  75  * Machine setup..
  76  */
  77 extern struct resource code_resource;
  78 extern struct resource data_resource;
  79
  80 /* cpu data as detected by the assembly code in head.S */
  81 struct cpuinfo_x86 new_cpu_data __cpuinitdata = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
  82 /* common cpu data for all cpus */
  83 struct cpuinfo_x86 boot_cpu_data __read_mostly = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
  84 EXPORT_SYMBOL(boot_cpu_data);
  85
  86 unsigned long mmu_cr4_features;
  87
  88 /* for MCA, but anyone else can use it if they want */
  89 unsigned int machine_id;
  90 #ifdef CONFIG_MCA
  91 EXPORT_SYMBOL(machine_id);
  92 #endif
  93 unsigned int machine_submodel_id;
  94 unsigned int BIOS_revision;
  95 unsigned int mca_pentium_flag;
  96
  97 /* Boot loader ID as an integer, for the benefit of proc_dointvec */
  98 int bootloader_type;
  99
 100 /* user-defined highmem size */
 101 static unsigned int highmem_pages = -1;
 102
 103 /*
 104  * Setup options
 105  */
 106 struct drive_info_struct { char dummy[32]; } drive_info;
 107 #if defined(CONFIG_BLK_DEV_IDE) || defined(CONFIG_BLK_DEV_HD) || \
 108     defined(CONFIG_BLK_DEV_IDE_MODULE) || defined(CONFIG_BLK_DEV_HD_MODULE)
 109 EXPORT_SYMBOL(drive_info);
 110 #endif
 111 struct screen_info screen_info;
 112 EXPORT_SYMBOL(screen_info);
 113 struct apm_info apm_info;
 114 EXPORT_SYMBOL(apm_info);
 115 struct sys_desc_table_struct {
 116         unsigned short length;
 117         unsigned char table[0];
 118 };
 119 struct edid_info edid_info;
 120 EXPORT_SYMBOL_GPL(edid_info);
 121 struct ist_info ist_info;
 122 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
 123         defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
 124 EXPORT_SYMBOL(ist_info);
 125 #endif
 126
 127 extern void early_cpu_init(void);
 128 extern int root_mountflags;
 129
 130 unsigned long saved_videomode;
 131
 132 #define RAMDISK_IMAGE_START_MASK        0x07FF
 133 #define RAMDISK_PROMPT_FLAG             0x8000
 134 #define RAMDISK_LOAD_FLAG               0x4000
 135
 136 static char __initdata command_line[COMMAND_LINE_SIZE];
 137
 138 unsigned char __initdata boot_params[PARAM_SIZE];
 139
 140 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
 141 struct edd edd;
 142 #ifdef CONFIG_EDD_MODULE
 143 EXPORT_SYMBOL(edd);
 144 #endif
 145 /**
 146  * copy_edd() - Copy the BIOS EDD information
 147  *              from boot_params into a safe place.
 148  *
 149  */
 150 static inline void copy_edd(void)
 151 {
 152      memcpy(edd.mbr_signature, EDD_MBR_SIGNATURE, sizeof(edd.mbr_signature));
 153      memcpy(edd.edd_info, EDD_BUF, sizeof(edd.edd_info));
 154      edd.mbr_signature_nr = EDD_MBR_SIG_NR;
 155      edd.edd_info_nr = EDD_NR;
 156 }
 157 #else
 158 static inline void copy_edd(void)
 159 {
 160 }
 161 #endif
 162
 163 int __initdata user_defined_memmap = 0;
 164
 165 /*
 166  * "mem=nopentium" disables the 4MB page tables.
 167  * "mem=XXX[kKmM]" defines a memory region from HIGH_MEM
 168  * to <mem>, overriding the bios size.
 169  * "memmap=XXX[KkmM]@XXX[KkmM]" defines a memory region from
 170  * <start> to <start>+<mem>, overriding the bios size.
 171  *
 172  * HPA tells me bootloaders need to parse mem=, so no new
 173  * option should be mem=  [also see Documentation/i386/boot.txt]
 174  */
 175 static int __init parse_mem(char *arg)
 176 {
 177         if (!arg)
 178                 return -EINVAL;
 179
 180         if (strcmp(arg, "nopentium") == 0) {
 181                 clear_bit(X86_FEATURE_PSE, boot_cpu_data.x86_capability);
 182                 disable_pse = 1;
 183         } else {
 184                 /* If the user specifies memory size, we
 185                  * limit the BIOS-provided memory map to
 186                  * that size. exactmap can be used to specify
 187                  * the exact map. mem=number can be used to
 188                  * trim the existing memory map.
 189                  */
 190                 unsigned long long mem_size;
 191
 192                 mem_size = memparse(arg, &arg);
 193                 limit_regions(mem_size);
 194                 user_defined_memmap = 1;
 195         }
 196         return 0;
 197 }
 198 early_param("mem", parse_mem);
 199
 200 #ifdef CONFIG_PROC_VMCORE
 201 /* elfcorehdr= specifies the location of elf core header
 202  * stored by the crashed kernel.
 203  */
 204 static int __init parse_elfcorehdr(char *arg)
 205 {
 206         if (!arg)
 207                 return -EINVAL;
 208
 209         elfcorehdr_addr = memparse(arg, &arg);
 210         return 0;
 211 }
 212 early_param("elfcorehdr", parse_elfcorehdr);
 213 #endif /* CONFIG_PROC_VMCORE */
 214
 215 /*
 216  * highmem=size forces highmem to be exactly 'size' bytes.
 217  * This works even on boxes that have no highmem otherwise.
 218  * This also works to reduce highmem size on bigger boxes.
 219  */
 220 static int __init parse_highmem(char *arg)
 221 {
 222         if (!arg)
 223                 return -EINVAL;
 224
 225         highmem_pages = memparse(arg, &arg) >> PAGE_SHIFT;
 226         return 0;
 227 }
 228 early_param("highmem", parse_highmem);
 229
 230 /*
 231  * vmalloc=size forces the vmalloc area to be exactly 'size'
 232  * bytes. This can be used to increase (or decrease) the
 233  * vmalloc area - the default is 128m.
 234  */
 235 static int __init parse_vmalloc(char *arg)
 236 {
 237         if (!arg)
 238                 return -EINVAL;
 239
 240         __VMALLOC_RESERVE = memparse(arg, &arg);
 241         return 0;
 242 }
 243 early_param("vmalloc", parse_vmalloc);
 244
 245 /*
 246  * reservetop=size reserves a hole at the top of the kernel address space which
 247  * a hypervisor can load into later.  Needed for dynamically loaded hypervisors,
 248  * so relocating the fixmap can be done before paging initialization.
 249  */
 250 static int __init parse_reservetop(char *arg)
 251 {
 252         unsigned long address;
 253
 254         if (!arg)
 255                 return -EINVAL;
 256
 257         address = memparse(arg, &arg);
 258         reserve_top_address(address);
 259         return 0;
 260 }
 261 early_param("reservetop", parse_reservetop);
 262
 263 /*
 264  * Determine low and high memory ranges:
 265  */
 266 unsigned long __init find_max_low_pfn(void)
 267 {
 268         unsigned long max_low_pfn;
 269
 270         max_low_pfn = max_pfn;
 271         if (max_low_pfn > MAXMEM_PFN) {
 272                 if (highmem_pages == -1)
 273                         highmem_pages = max_pfn - MAXMEM_PFN;
 274                 if (highmem_pages + MAXMEM_PFN < max_pfn)
 275                         max_pfn = MAXMEM_PFN + highmem_pages;
 276                 if (highmem_pages + MAXMEM_PFN > max_pfn) {
 277                         printk("only %luMB highmem pages available, ignoring highmem size of %uMB.\n", pages_to_mb(max_pfn - MAXMEM_PFN), pages_to_mb(highmem_pages));
 278                         highmem_pages = 0;
 279                 }
 280                 max_low_pfn = MAXMEM_PFN;
 281 #ifndef CONFIG_HIGHMEM
 282                 /* Maximum memory usable is what is directly addressable */
 283                 printk(KERN_WARNING "Warning only %ldMB will be used.\n",
 284                                         MAXMEM>>20);
 285                 if (max_pfn > MAX_NONPAE_PFN)
 286                         printk(KERN_WARNING "Use a PAE enabled kernel.\n");
 287                 else
 288                         printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
 289                 max_pfn = MAXMEM_PFN;
 290 #else /* !CONFIG_HIGHMEM */
 291 #ifndef CONFIG_X86_PAE
 292                 if (max_pfn > MAX_NONPAE_PFN) {
 293                         max_pfn = MAX_NONPAE_PFN;
 294                         printk(KERN_WARNING "Warning only 4GB will be used.\n");
 295                         printk(KERN_WARNING "Use a PAE enabled kernel.\n");
 296                 }
 297 #endif /* !CONFIG_X86_PAE */
 298 #endif /* !CONFIG_HIGHMEM */
 299         } else {
 300                 if (highmem_pages == -1)
 301                         highmem_pages = 0;
 302 #ifdef CONFIG_HIGHMEM
 303                 if (highmem_pages >= max_pfn) {
 304                         printk(KERN_ERR "highmem size specified (%uMB) is bigger than pages available (%luMB)!.\n", pages_to_mb(highmem_pages), pages_to_mb(max_pfn));
 305                         highmem_pages = 0;
 306                 }
 307                 if (highmem_pages) {
 308                         if (max_low_pfn-highmem_pages < 64*1024*1024/PAGE_SIZE){
 309                                 printk(KERN_ERR "highmem size %uMB results in smaller than 64MB lowmem, ignoring it.\n", pages_to_mb(highmem_pages));
 310                                 highmem_pages = 0;
 311                         }
 312                         max_low_pfn -= highmem_pages;
 313                 }
 314 #else
 315                 if (highmem_pages)
 316                         printk(KERN_ERR "ignoring highmem size on non-highmem kernel!\n");
 317 #endif
 318         }
 319         return max_low_pfn;
 320 }
 321
 322 /*
 323  * workaround for Dell systems that neglect to reserve EBDA
 324  */
 325 static void __init reserve_ebda_region(void)
 326 {
 327         unsigned int addr;
 328         addr = get_bios_ebda();
 329         if (addr)
 330                 reserve_bootmem(addr, PAGE_SIZE);
 331 }
 332
 333 #ifndef CONFIG_NEED_MULTIPLE_NODES
 334 void __init setup_bootmem_allocator(void);
 335 static unsigned long __init setup_memory(void)
 336 {
 337         /*
 338          * partially used pages are not usable - thus
 339          * we are rounding upwards:
 340          */
 341         min_low_pfn = PFN_UP(init_pg_tables_end);
 342
 343         find_max_pfn();
 344
 345         max_low_pfn = find_max_low_pfn();
 346
 347 #ifdef CONFIG_HIGHMEM
 348         highstart_pfn = highend_pfn = max_pfn;
 349         if (max_pfn > max_low_pfn) {
 350                 highstart_pfn = max_low_pfn;
 351         }
 352         printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
 353                 pages_to_mb(highend_pfn - highstart_pfn));
 354         num_physpages = highend_pfn;
 355         high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1;
 356 #else
 357         num_physpages = max_low_pfn;
 358         high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1;
 359 #endif
 360 #ifdef CONFIG_FLATMEM
 361         max_mapnr = num_physpages;
 362 #endif
 363         printk(KERN_NOTICE "%ldMB LOWMEM available.\n",
 364                         pages_to_mb(max_low_pfn));
 365
 366         setup_bootmem_allocator();
 367
 368         return max_low_pfn;
 369 }
 370
 371 void __init zone_sizes_init(void)
 372 {
 373         unsigned long max_zone_pfns[MAX_NR_ZONES];
 374         memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
 375         max_zone_pfns[ZONE_DMA] =
 376                 virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
 377         max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
 378 #ifdef CONFIG_HIGHMEM
 379         max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
 380         add_active_range(0, 0, highend_pfn);
 381 #else
 382         add_active_range(0, 0, max_low_pfn);
 383 #endif
 384
 385         free_area_init_nodes(max_zone_pfns);
 386 }
 387 #else
 388 extern unsigned long __init setup_memory(void);
 389 extern void zone_sizes_init(void);
 390 #endif /* !CONFIG_NEED_MULTIPLE_NODES */
 391
 392 void __init setup_bootmem_allocator(void)
 393 {
 394         unsigned long bootmap_size;
 395         /*
 396          * Initialize the boot-time allocator (with low memory only):
 397          */
 398         bootmap_size = init_bootmem(min_low_pfn, max_low_pfn);
 399
 400         register_bootmem_low_pages(max_low_pfn);
 401
 402         /*
 403          * Reserve the bootmem bitmap itself as well. We do this in two
 404          * steps (first step was init_bootmem()) because this catches
 405          * the (very unlikely) case of us accidentally initializing the
 406          * bootmem allocator with an invalid RAM area.
 407          */
 408         reserve_bootmem(__pa_symbol(_text), (PFN_PHYS(min_low_pfn) +
 409                          bootmap_size + PAGE_SIZE-1) - __pa_symbol(_text));
 410
 411         /*
 412          * reserve physical page 0 - it's a special BIOS page on many boxes,
 413          * enabling clean reboots, SMP operation, laptop functions.
 414          */
 415         reserve_bootmem(0, PAGE_SIZE);
 416
 417         /* reserve EBDA region, it's a 4K region */
 418         reserve_ebda_region();
 419
 420     /* could be an AMD 768MPX chipset. Reserve a page  before VGA to prevent
 421        PCI prefetch into it (errata #56). Usually the page is reserved anyways,
 422        unless you have no PS/2 mouse plugged in. */
 423         if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
 424             boot_cpu_data.x86 == 6)
 425              reserve_bootmem(0xa0000 - 4096, 4096);
 426
 427 #ifdef CONFIG_SMP
 428         /*
 429          * But first pinch a few for the stack/trampoline stuff
 430          * FIXME: Don't need the extra page at 4K, but need to fix
 431          * trampoline before removing it. (see the GDT stuff)
 432          */
 433         reserve_bootmem(PAGE_SIZE, PAGE_SIZE);
 434 #endif
 435 #ifdef CONFIG_ACPI_SLEEP
 436         /*
 437          * Reserve low memory region for sleep support.
 438          */
 439         acpi_reserve_bootmem();
 440 #endif
 441 #ifdef CONFIG_X86_FIND_SMP_CONFIG
 442         /*
 443          * Find and reserve possible boot-time SMP configuration:
 444          */
 445         find_smp_config();
 446 #endif
 447         numa_kva_reserve();
 448 #ifdef CONFIG_BLK_DEV_INITRD
 449         if (LOADER_TYPE && INITRD_START) {
 450                 if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
 451                         reserve_bootmem(INITRD_START, INITRD_SIZE);
 452                         initrd_start = INITRD_START + PAGE_OFFSET;
 453                         initrd_end = initrd_start+INITRD_SIZE;
 454                 }
 455                 else {
 456                         printk(KERN_ERR "initrd extends beyond end of memory "
 457                             "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 458                             INITRD_START + INITRD_SIZE,
 459                             max_low_pfn << PAGE_SHIFT);
 460                         initrd_start = 0;
 461                 }
 462         }
 463 #endif
 464 #ifdef CONFIG_KEXEC
 465         if (crashk_res.start != crashk_res.end)
 466                 reserve_bootmem(crashk_res.start,
 467                         crashk_res.end - crashk_res.start + 1);
 468 #endif
 469 }
 470
 471 /*
 472  * The node 0 pgdat is initialized before all of these because
 473  * it's needed for bootmem.  node>0 pgdats have their virtual
 474  * space allocated before the pagetables are in place to access
 475  * them, so they can't be cleared then.
 476  *
 477  * This should all compile down to nothing when NUMA is off.
 478  */
 479 void __init remapped_pgdat_init(void)
 480 {
 481         int nid;
 482
 483         for_each_online_node(nid) {
 484                 if (nid != 0)
 485                         memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
 486         }
 487 }
 488
 489 #ifdef CONFIG_MCA
 490 static void set_mca_bus(int x)
 491 {
 492         MCA_bus = x;
 493 }
 494 #else
 495 static void set_mca_bus(int x) { }
 496 #endif
 497
 498 /* Overridden in paravirt.c if CONFIG_PARAVIRT */
 499 char * __init __attribute__((weak)) memory_setup(void)
 500 {
 501         return machine_specific_memory_setup();
 502 }
 503
 504 /*
 505  * Determine if we were loaded by an EFI loader.  If so, then we have also been
 506  * passed the efi memmap, systab, etc., so we should use these data structures
 507  * for initialization.  Note, the efi init code path is determined by the
 508  * global efi_enabled. This allows the same kernel image to be used on existing
 509  * systems (with a traditional BIOS) as well as on EFI systems.
 510  */
 511 void __init setup_arch(char **cmdline_p)
 512 {
 513         unsigned long max_low_pfn;
 514
 515         memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
 516         pre_setup_arch_hook();
 517         early_cpu_init();
 518
 519         /*
 520          * FIXME: This isn't an official loader_type right
 521          * now but does currently work with elilo.
 522          * If we were configured as an EFI kernel, check to make
 523          * sure that we were loaded correctly from elilo and that
 524          * the system table is valid.  If not, then initialize normally.
 525          */
 526 #ifdef CONFIG_EFI
 527         if ((LOADER_TYPE == 0x50) && EFI_SYSTAB)
 528                 efi_enabled = 1;
 529 #endif
 530
 531         ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
 532         drive_info = DRIVE_INFO;
 533         screen_info = SCREEN_INFO;
 534         edid_info = EDID_INFO;
 535         apm_info.bios = APM_BIOS_INFO;
 536         ist_info = IST_INFO;
 537         saved_videomode = VIDEO_MODE;
 538         if( SYS_DESC_TABLE.length != 0 ) {
 539                 set_mca_bus(SYS_DESC_TABLE.table[3] & 0x2);
 540                 machine_id = SYS_DESC_TABLE.table[0];
 541                 machine_submodel_id = SYS_DESC_TABLE.table[1];
 542                 BIOS_revision = SYS_DESC_TABLE.table[2];
 543         }
 544         bootloader_type = LOADER_TYPE;
 545
 546 #ifdef CONFIG_BLK_DEV_RAM
 547         rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
 548         rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
 549         rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
 550 #endif
 551         ARCH_SETUP
 552         if (efi_enabled)
 553                 efi_init();
 554         else {
 555                 printk(KERN_INFO "BIOS-provided physical RAM map:\n");
 556                 print_memory_map(memory_setup());
 557         }
 558
 559         copy_edd();
 560
 561         if (!MOUNT_ROOT_RDONLY)
 562                 root_mountflags &= ~MS_RDONLY;
 563         init_mm.start_code = (unsigned long) _text;
 564         init_mm.end_code = (unsigned long) _etext;
 565         init_mm.end_data = (unsigned long) _edata;
 566         init_mm.brk = init_pg_tables_end + PAGE_OFFSET;
 567
 568         code_resource.start = virt_to_phys(_text);
 569         code_resource.end = virt_to_phys(_etext)-1;
 570         data_resource.start = virt_to_phys(_etext);
 571         data_resource.end = virt_to_phys(_edata)-1;
 572
 573         parse_early_param();
 574
 575         if (user_defined_memmap) {
 576                 printk(KERN_INFO "user-defined physical RAM map:\n");
 577                 print_memory_map("user");
 578         }
 579
 580         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 581         *cmdline_p = command_line;
 582
 583         max_low_pfn = setup_memory();
 584
 585 #ifdef CONFIG_VMI
 586         /*
 587          * Must be after max_low_pfn is determined, and before kernel
 588          * pagetables are setup.
 589          */
 590         vmi_init();
 591 #endif
 592
 593         /*
 594          * NOTE: before this point _nobody_ is allowed to allocate
 595          * any memory using the bootmem allocator.  Although the
 596          * alloctor is now initialised only the first 8Mb of the kernel
 597          * virtual address space has been mapped.  All allocations before
 598          * paging_init() has completed must use the alloc_bootmem_low_pages()
 599          * variant (which allocates DMA'able memory) and care must be taken
 600          * not to exceed the 8Mb limit.
 601          */
 602
 603 #ifdef CONFIG_SMP
 604         smp_alloc_memory(); /* AP processor realmode stacks in low memory*/
 605 #endif
 606         paging_init();
 607         remapped_pgdat_init();
 608         sparse_init();
 609         zone_sizes_init();
 610
 611         /*
 612          * NOTE: at this point the bootmem allocator is fully available.
 613          */
 614
 615         dmi_scan_machine();
 616
 617 #ifdef CONFIG_X86_GENERICARCH
 618         generic_apic_probe();
 619 #endif
 620         if (efi_enabled)
 621                 efi_map_memmap();
 622
 623 #ifdef CONFIG_ACPI
 624         /*
 625          * Parse the ACPI tables for possible boot-time SMP configuration.
 626          */
 627         acpi_boot_table_init();
 628 #endif
 629
 630 #ifdef CONFIG_PCI
 631 #ifdef CONFIG_X86_IO_APIC
 632         check_acpi_pci();       /* Checks more than just ACPI actually */
 633 #endif
 634 #endif
 635
 636 #ifdef CONFIG_ACPI
 637         acpi_boot_init();
 638
 639 #if defined(CONFIG_SMP) && defined(CONFIG_X86_PC)
 640         if (def_to_bigsmp)
 641                 printk(KERN_WARNING "More than 8 CPUs detected and "
 642                         "CONFIG_X86_PC cannot handle it.\nUse "
 643                         "CONFIG_X86_GENERICARCH or CONFIG_X86_BIGSMP.\n");
 644 #endif
 645 #endif
 646 #ifdef CONFIG_X86_LOCAL_APIC
 647         if (smp_found_config)
 648                 get_smp_config();
 649 #endif
 650
 651         e820_register_memory();
 652
 653 #ifdef CONFIG_VT
 654 #if defined(CONFIG_VGA_CONSOLE)
 655         if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
 656                 conswitchp = &vga_con;
 657 #elif defined(CONFIG_DUMMY_CONSOLE)
 658         conswitchp = &dummy_con;
 659 #endif
 660 #endif
 661         tsc_init();
 662 }
 663
 664 static __init int add_pcspkr(void)
 665 {
 666         struct platform_device *pd;
 667         int ret;
 668
 669         pd = platform_device_alloc("pcspkr", -1);
 670         if (!pd)
 671                 return -ENOMEM;
 672
 673         ret = platform_device_add(pd);
 674         if (ret)
 675                 platform_device_put(pd);
 676
 677         return ret;
 678 }
 679 device_initcall(add_pcspkr);
 680
 681 /*
 682  * Local Variables:
 683  * mode:c
 684  * c-file-style:"k&r"
 685  * c-basic-offset:8
 686  * End:
 687  */