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 static inline unsigned long long get_total_mem(void)
 382 {
 383         unsigned long long total;
 384
 385         total = max_low_pfn - min_low_pfn;
 386 #ifdef CONFIG_HIGHMEM
 387         total += highend_pfn - highstart_pfn;
 388 #endif
 389
 390         return total << PAGE_SHIFT;
 391 }
 392
 393 #ifdef CONFIG_KEXEC
 394 static void __init reserve_crashkernel(void)
 395 {
 396         unsigned long long total_mem;
 397         unsigned long long crash_size, crash_base;
 398         int ret;
 399
 400         total_mem = get_total_mem();
 401
 402         ret = parse_crashkernel(boot_command_line, total_mem,
 403                         &crash_size, &crash_base);
 404         if (ret == 0 && crash_size > 0) {
 405                 if (crash_base > 0) {
 406                         printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
 407                                         "for crashkernel (System RAM: %ldMB)\n",
 408                                         (unsigned long)(crash_size >> 20),
 409                                         (unsigned long)(crash_base >> 20),
 410                                         (unsigned long)(total_mem >> 20));
 411                         crashk_res.start = crash_base;
 412                         crashk_res.end   = crash_base + crash_size - 1;
 413                         reserve_bootmem(crash_base, crash_size);
 414                 } else
 415                         printk(KERN_INFO "crashkernel reservation failed - "
 416                                         "you have to specify a base address\n");
 417         }
 418 }
 419 #else
 420 static inline void __init reserve_crashkernel(void)
 421 {}
 422 #endif
 423
 424 void __init setup_bootmem_allocator(void)
 425 {
 426         unsigned long bootmap_size;
 427         /*
 428          * Initialize the boot-time allocator (with low memory only):
 429          */
 430         bootmap_size = init_bootmem(min_low_pfn, max_low_pfn);
 431
 432         register_bootmem_low_pages(max_low_pfn);
 433
 434         /*
 435          * Reserve the bootmem bitmap itself as well. We do this in two
 436          * steps (first step was init_bootmem()) because this catches
 437          * the (very unlikely) case of us accidentally initializing the
 438          * bootmem allocator with an invalid RAM area.
 439          */
 440         reserve_bootmem(__pa_symbol(_text), (PFN_PHYS(min_low_pfn) +
 441                          bootmap_size + PAGE_SIZE-1) - __pa_symbol(_text));
 442
 443         /*
 444          * reserve physical page 0 - it's a special BIOS page on many boxes,
 445          * enabling clean reboots, SMP operation, laptop functions.
 446          */
 447         reserve_bootmem(0, PAGE_SIZE);
 448
 449         /* reserve EBDA region, it's a 4K region */
 450         reserve_ebda_region();
 451
 452     /* could be an AMD 768MPX chipset. Reserve a page  before VGA to prevent
 453        PCI prefetch into it (errata #56). Usually the page is reserved anyways,
 454        unless you have no PS/2 mouse plugged in. */
 455         if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
 456             boot_cpu_data.x86 == 6)
 457              reserve_bootmem(0xa0000 - 4096, 4096);
 458
 459 #ifdef CONFIG_SMP
 460         /*
 461          * But first pinch a few for the stack/trampoline stuff
 462          * FIXME: Don't need the extra page at 4K, but need to fix
 463          * trampoline before removing it. (see the GDT stuff)
 464          */
 465         reserve_bootmem(PAGE_SIZE, PAGE_SIZE);
 466 #endif
 467 #ifdef CONFIG_ACPI_SLEEP
 468         /*
 469          * Reserve low memory region for sleep support.
 470          */
 471         acpi_reserve_bootmem();
 472 #endif
 473 #ifdef CONFIG_X86_FIND_SMP_CONFIG
 474         /*
 475          * Find and reserve possible boot-time SMP configuration:
 476          */
 477         find_smp_config();
 478 #endif
 479         numa_kva_reserve();
 480 #ifdef CONFIG_BLK_DEV_INITRD
 481         if (boot_params.hdr.type_of_loader && boot_params.hdr.ramdisk_image) {
 482                 unsigned long ramdisk_image = boot_params.hdr.ramdisk_image;
 483                 unsigned long ramdisk_size  = boot_params.hdr.ramdisk_size;
 484                 unsigned long ramdisk_end   = ramdisk_image + ramdisk_size;
 485                 unsigned long end_of_lowmem = max_low_pfn << PAGE_SHIFT;
 486
 487                 if (ramdisk_end <= end_of_lowmem) {
 488                         reserve_bootmem(ramdisk_image, ramdisk_size);
 489                         initrd_start = ramdisk_image + PAGE_OFFSET;
 490                         initrd_end = initrd_start+ramdisk_size;
 491                 } else {
 492                         printk(KERN_ERR "initrd extends beyond end of memory "
 493                                "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 494                                ramdisk_end, end_of_lowmem);
 495                         initrd_start = 0;
 496                 }
 497         }
 498 #endif
 499         reserve_crashkernel();
 500 }
 501
 502 /*
 503  * The node 0 pgdat is initialized before all of these because
 504  * it's needed for bootmem.  node>0 pgdats have their virtual
 505  * space allocated before the pagetables are in place to access
 506  * them, so they can't be cleared then.
 507  *
 508  * This should all compile down to nothing when NUMA is off.
 509  */
 510 static void __init remapped_pgdat_init(void)
 511 {
 512         int nid;
 513
 514         for_each_online_node(nid) {
 515                 if (nid != 0)
 516                         memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
 517         }
 518 }
 519
 520 #ifdef CONFIG_MCA
 521 static void set_mca_bus(int x)
 522 {
 523         MCA_bus = x;
 524 }
 525 #else
 526 static void set_mca_bus(int x) { }
 527 #endif
 528
 529 /* Overridden in paravirt.c if CONFIG_PARAVIRT */
 530 char * __init __attribute__((weak)) memory_setup(void)
 531 {
 532         return machine_specific_memory_setup();
 533 }
 534
 535 /*
 536  * Determine if we were loaded by an EFI loader.  If so, then we have also been
 537  * passed the efi memmap, systab, etc., so we should use these data structures
 538  * for initialization.  Note, the efi init code path is determined by the
 539  * global efi_enabled. This allows the same kernel image to be used on existing
 540  * systems (with a traditional BIOS) as well as on EFI systems.
 541  */
 542 void __init setup_arch(char **cmdline_p)
 543 {
 544         unsigned long max_low_pfn;
 545
 546         memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
 547         pre_setup_arch_hook();
 548         early_cpu_init();
 549
 550         /*
 551          * FIXME: This isn't an official loader_type right
 552          * now but does currently work with elilo.
 553          * If we were configured as an EFI kernel, check to make
 554          * sure that we were loaded correctly from elilo and that
 555          * the system table is valid.  If not, then initialize normally.
 556          */
 557 #ifdef CONFIG_EFI
 558         if ((boot_params.hdr.type_of_loader == 0x50) &&
 559             boot_params.efi_info.efi_systab)
 560                 efi_enabled = 1;
 561 #endif
 562
 563         ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
 564         screen_info = boot_params.screen_info;
 565         edid_info = boot_params.edid_info;
 566         apm_info.bios = boot_params.apm_bios_info;
 567         ist_info = boot_params.ist_info;
 568         saved_videomode = boot_params.hdr.vid_mode;
 569         if( boot_params.sys_desc_table.length != 0 ) {
 570                 set_mca_bus(boot_params.sys_desc_table.table[3] & 0x2);
 571                 machine_id = boot_params.sys_desc_table.table[0];
 572                 machine_submodel_id = boot_params.sys_desc_table.table[1];
 573                 BIOS_revision = boot_params.sys_desc_table.table[2];
 574         }
 575         bootloader_type = boot_params.hdr.type_of_loader;
 576
 577 #ifdef CONFIG_BLK_DEV_RAM
 578         rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
 579         rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
 580         rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
 581 #endif
 582         ARCH_SETUP
 583         if (efi_enabled)
 584                 efi_init();
 585         else {
 586                 printk(KERN_INFO "BIOS-provided physical RAM map:\n");
 587                 print_memory_map(memory_setup());
 588         }
 589
 590         copy_edd();
 591
 592         if (!boot_params.hdr.root_flags)
 593                 root_mountflags &= ~MS_RDONLY;
 594         init_mm.start_code = (unsigned long) _text;
 595         init_mm.end_code = (unsigned long) _etext;
 596         init_mm.end_data = (unsigned long) _edata;
 597         init_mm.brk = init_pg_tables_end + PAGE_OFFSET;
 598
 599         code_resource.start = virt_to_phys(_text);
 600         code_resource.end = virt_to_phys(_etext)-1;
 601         data_resource.start = virt_to_phys(_etext);
 602         data_resource.end = virt_to_phys(_edata)-1;
 603
 604         parse_early_param();
 605
 606         if (user_defined_memmap) {
 607                 printk(KERN_INFO "user-defined physical RAM map:\n");
 608                 print_memory_map("user");
 609         }
 610
 611         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 612         *cmdline_p = command_line;
 613
 614         max_low_pfn = setup_memory();
 615
 616 #ifdef CONFIG_VMI
 617         /*
 618          * Must be after max_low_pfn is determined, and before kernel
 619          * pagetables are setup.
 620          */
 621         vmi_init();
 622 #endif
 623
 624         /*
 625          * NOTE: before this point _nobody_ is allowed to allocate
 626          * any memory using the bootmem allocator.  Although the
 627          * alloctor is now initialised only the first 8Mb of the kernel
 628          * virtual address space has been mapped.  All allocations before
 629          * paging_init() has completed must use the alloc_bootmem_low_pages()
 630          * variant (which allocates DMA'able memory) and care must be taken
 631          * not to exceed the 8Mb limit.
 632          */
 633
 634 #ifdef CONFIG_SMP
 635         smp_alloc_memory(); /* AP processor realmode stacks in low memory*/
 636 #endif
 637         paging_init();
 638         remapped_pgdat_init();
 639         sparse_init();
 640         zone_sizes_init();
 641
 642         /*
 643          * NOTE: at this point the bootmem allocator is fully available.
 644          */
 645
 646         paravirt_post_allocator_init();
 647
 648         dmi_scan_machine();
 649
 650 #ifdef CONFIG_X86_GENERICARCH
 651         generic_apic_probe();
 652 #endif
 653         if (efi_enabled)
 654                 efi_map_memmap();
 655
 656 #ifdef CONFIG_ACPI
 657         /*
 658          * Parse the ACPI tables for possible boot-time SMP configuration.
 659          */
 660         acpi_boot_table_init();
 661 #endif
 662
 663 #ifdef CONFIG_PCI
 664         early_quirks();
 665 #endif
 666
 667 #ifdef CONFIG_ACPI
 668         acpi_boot_init();
 669
 670 #if defined(CONFIG_SMP) && defined(CONFIG_X86_PC)
 671         if (def_to_bigsmp)
 672                 printk(KERN_WARNING "More than 8 CPUs detected and "
 673                         "CONFIG_X86_PC cannot handle it.\nUse "
 674                         "CONFIG_X86_GENERICARCH or CONFIG_X86_BIGSMP.\n");
 675 #endif
 676 #endif
 677 #ifdef CONFIG_X86_LOCAL_APIC
 678         if (smp_found_config)
 679                 get_smp_config();
 680 #endif
 681
 682         e820_register_memory();
 683         e820_mark_nosave_regions();
 684
 685 #ifdef CONFIG_VT
 686 #if defined(CONFIG_VGA_CONSOLE)
 687         if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
 688                 conswitchp = &vga_con;
 689 #elif defined(CONFIG_DUMMY_CONSOLE)
 690         conswitchp = &dummy_con;
 691 #endif
 692 #endif
 693 }