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 #include <asm/cacheflush.h>
  64
  65 /* This value is set up by the early boot code to point to the value
  66    immediately after the boot time page tables.  It contains a *physical*
  67    address, and must not be in the .bss segment! */
  68 unsigned long init_pg_tables_end __initdata = ~0UL;
  69
  70 int disable_pse __devinitdata = 0;
  71
  72 /*
  73  * Machine setup..
  74  */
  75 extern struct resource code_resource;
  76 extern struct resource data_resource;
  77 extern struct resource bss_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 screen_info screen_info;
 106 EXPORT_SYMBOL(screen_info);
 107 struct apm_info apm_info;
 108 EXPORT_SYMBOL(apm_info);
 109 struct edid_info edid_info;
 110 EXPORT_SYMBOL_GPL(edid_info);
 111 struct ist_info ist_info;
 112 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
 113         defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
 114 EXPORT_SYMBOL(ist_info);
 115 #endif
 116
 117 extern void early_cpu_init(void);
 118 extern int root_mountflags;
 119
 120 unsigned long saved_videomode;
 121
 122 #define RAMDISK_IMAGE_START_MASK        0x07FF
 123 #define RAMDISK_PROMPT_FLAG             0x8000
 124 #define RAMDISK_LOAD_FLAG               0x4000
 125
 126 static char __initdata command_line[COMMAND_LINE_SIZE];
 127
 128 struct boot_params __initdata boot_params;
 129
 130 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
 131 struct edd edd;
 132 #ifdef CONFIG_EDD_MODULE
 133 EXPORT_SYMBOL(edd);
 134 #endif
 135 /**
 136  * copy_edd() - Copy the BIOS EDD information
 137  *              from boot_params into a safe place.
 138  *
 139  */
 140 static inline void copy_edd(void)
 141 {
 142      memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
 143             sizeof(edd.mbr_signature));
 144      memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
 145      edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
 146      edd.edd_info_nr = boot_params.eddbuf_entries;
 147 }
 148 #else
 149 static inline void copy_edd(void)
 150 {
 151 }
 152 #endif
 153
 154 int __initdata user_defined_memmap = 0;
 155
 156 /*
 157  * "mem=nopentium" disables the 4MB page tables.
 158  * "mem=XXX[kKmM]" defines a memory region from HIGH_MEM
 159  * to <mem>, overriding the bios size.
 160  * "memmap=XXX[KkmM]@XXX[KkmM]" defines a memory region from
 161  * <start> to <start>+<mem>, overriding the bios size.
 162  *
 163  * HPA tells me bootloaders need to parse mem=, so no new
 164  * option should be mem=  [also see Documentation/i386/boot.txt]
 165  */
 166 static int __init parse_mem(char *arg)
 167 {
 168         if (!arg)
 169                 return -EINVAL;
 170
 171         if (strcmp(arg, "nopentium") == 0) {
 172                 clear_bit(X86_FEATURE_PSE, boot_cpu_data.x86_capability);
 173                 disable_pse = 1;
 174         } else {
 175                 /* If the user specifies memory size, we
 176                  * limit the BIOS-provided memory map to
 177                  * that size. exactmap can be used to specify
 178                  * the exact map. mem=number can be used to
 179                  * trim the existing memory map.
 180                  */
 181                 unsigned long long mem_size;
 182
 183                 mem_size = memparse(arg, &arg);
 184                 limit_regions(mem_size);
 185                 user_defined_memmap = 1;
 186         }
 187         return 0;
 188 }
 189 early_param("mem", parse_mem);
 190
 191 #ifdef CONFIG_PROC_VMCORE
 192 /* elfcorehdr= specifies the location of elf core header
 193  * stored by the crashed kernel.
 194  */
 195 static int __init parse_elfcorehdr(char *arg)
 196 {
 197         if (!arg)
 198                 return -EINVAL;
 199
 200         elfcorehdr_addr = memparse(arg, &arg);
 201         return 0;
 202 }
 203 early_param("elfcorehdr", parse_elfcorehdr);
 204 #endif /* CONFIG_PROC_VMCORE */
 205
 206 /*
 207  * highmem=size forces highmem to be exactly 'size' bytes.
 208  * This works even on boxes that have no highmem otherwise.
 209  * This also works to reduce highmem size on bigger boxes.
 210  */
 211 static int __init parse_highmem(char *arg)
 212 {
 213         if (!arg)
 214                 return -EINVAL;
 215
 216         highmem_pages = memparse(arg, &arg) >> PAGE_SHIFT;
 217         return 0;
 218 }
 219 early_param("highmem", parse_highmem);
 220
 221 /*
 222  * vmalloc=size forces the vmalloc area to be exactly 'size'
 223  * bytes. This can be used to increase (or decrease) the
 224  * vmalloc area - the default is 128m.
 225  */
 226 static int __init parse_vmalloc(char *arg)
 227 {
 228         if (!arg)
 229                 return -EINVAL;
 230
 231         __VMALLOC_RESERVE = memparse(arg, &arg);
 232         return 0;
 233 }
 234 early_param("vmalloc", parse_vmalloc);
 235
 236 /*
 237  * reservetop=size reserves a hole at the top of the kernel address space which
 238  * a hypervisor can load into later.  Needed for dynamically loaded hypervisors,
 239  * so relocating the fixmap can be done before paging initialization.
 240  */
 241 static int __init parse_reservetop(char *arg)
 242 {
 243         unsigned long address;
 244
 245         if (!arg)
 246                 return -EINVAL;
 247
 248         address = memparse(arg, &arg);
 249         reserve_top_address(address);
 250         return 0;
 251 }
 252 early_param("reservetop", parse_reservetop);
 253
 254 /*
 255  * Determine low and high memory ranges:
 256  */
 257 unsigned long __init find_max_low_pfn(void)
 258 {
 259         unsigned long max_low_pfn;
 260
 261         max_low_pfn = max_pfn;
 262         if (max_low_pfn > MAXMEM_PFN) {
 263                 if (highmem_pages == -1)
 264                         highmem_pages = max_pfn - MAXMEM_PFN;
 265                 if (highmem_pages + MAXMEM_PFN < max_pfn)
 266                         max_pfn = MAXMEM_PFN + highmem_pages;
 267                 if (highmem_pages + MAXMEM_PFN > max_pfn) {
 268                         printk("only %luMB highmem pages available, ignoring highmem size of %uMB.\n", pages_to_mb(max_pfn - MAXMEM_PFN), pages_to_mb(highmem_pages));
 269                         highmem_pages = 0;
 270                 }
 271                 max_low_pfn = MAXMEM_PFN;
 272 #ifndef CONFIG_HIGHMEM
 273                 /* Maximum memory usable is what is directly addressable */
 274                 printk(KERN_WARNING "Warning only %ldMB will be used.\n",
 275                                         MAXMEM>>20);
 276                 if (max_pfn > MAX_NONPAE_PFN)
 277                         printk(KERN_WARNING "Use a HIGHMEM64G enabled kernel.\n");
 278                 else
 279                         printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
 280                 max_pfn = MAXMEM_PFN;
 281 #else /* !CONFIG_HIGHMEM */
 282 #ifndef CONFIG_HIGHMEM64G
 283                 if (max_pfn > MAX_NONPAE_PFN) {
 284                         max_pfn = MAX_NONPAE_PFN;
 285                         printk(KERN_WARNING "Warning only 4GB will be used.\n");
 286                         printk(KERN_WARNING "Use a HIGHMEM64G enabled kernel.\n");
 287                 }
 288 #endif /* !CONFIG_HIGHMEM64G */
 289 #endif /* !CONFIG_HIGHMEM */
 290         } else {
 291                 if (highmem_pages == -1)
 292                         highmem_pages = 0;
 293 #ifdef CONFIG_HIGHMEM
 294                 if (highmem_pages >= max_pfn) {
 295                         printk(KERN_ERR "highmem size specified (%uMB) is bigger than pages available (%luMB)!.\n", pages_to_mb(highmem_pages), pages_to_mb(max_pfn));
 296                         highmem_pages = 0;
 297                 }
 298                 if (highmem_pages) {
 299                         if (max_low_pfn-highmem_pages < 64*1024*1024/PAGE_SIZE){
 300                                 printk(KERN_ERR "highmem size %uMB results in smaller than 64MB lowmem, ignoring it.\n", pages_to_mb(highmem_pages));
 301                                 highmem_pages = 0;
 302                         }
 303                         max_low_pfn -= highmem_pages;
 304                 }
 305 #else
 306                 if (highmem_pages)
 307                         printk(KERN_ERR "ignoring highmem size on non-highmem kernel!\n");
 308 #endif
 309         }
 310         return max_low_pfn;
 311 }
 312
 313 /*
 314  * workaround for Dell systems that neglect to reserve EBDA
 315  */
 316 static void __init reserve_ebda_region(void)
 317 {
 318         unsigned int addr;
 319         addr = get_bios_ebda();
 320         if (addr)
 321                 reserve_bootmem(addr, PAGE_SIZE);
 322 }
 323
 324 #ifndef CONFIG_NEED_MULTIPLE_NODES
 325 void __init setup_bootmem_allocator(void);
 326 static unsigned long __init setup_memory(void)
 327 {
 328         /*
 329          * partially used pages are not usable - thus
 330          * we are rounding upwards:
 331          */
 332         min_low_pfn = PFN_UP(init_pg_tables_end);
 333
 334         find_max_pfn();
 335
 336         max_low_pfn = find_max_low_pfn();
 337
 338 #ifdef CONFIG_HIGHMEM
 339         highstart_pfn = highend_pfn = max_pfn;
 340         if (max_pfn > max_low_pfn) {
 341                 highstart_pfn = max_low_pfn;
 342         }
 343         printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
 344                 pages_to_mb(highend_pfn - highstart_pfn));
 345         num_physpages = highend_pfn;
 346         high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1;
 347 #else
 348         num_physpages = max_low_pfn;
 349         high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1;
 350 #endif
 351 #ifdef CONFIG_FLATMEM
 352         max_mapnr = num_physpages;
 353 #endif
 354         printk(KERN_NOTICE "%ldMB LOWMEM available.\n",
 355                         pages_to_mb(max_low_pfn));
 356
 357         setup_bootmem_allocator();
 358
 359         return max_low_pfn;
 360 }
 361
 362 void __init zone_sizes_init(void)
 363 {
 364         unsigned long max_zone_pfns[MAX_NR_ZONES];
 365         memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
 366         max_zone_pfns[ZONE_DMA] =
 367                 virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
 368         max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
 369 #ifdef CONFIG_HIGHMEM
 370         max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
 371         add_active_range(0, 0, highend_pfn);
 372 #else
 373         add_active_range(0, 0, max_low_pfn);
 374 #endif
 375
 376         free_area_init_nodes(max_zone_pfns);
 377 }
 378 #else
 379 extern unsigned long __init setup_memory(void);
 380 extern void zone_sizes_init(void);
 381 #endif /* !CONFIG_NEED_MULTIPLE_NODES */
 382
 383 static inline unsigned long long get_total_mem(void)
 384 {
 385         unsigned long long total;
 386
 387         total = max_low_pfn - min_low_pfn;
 388 #ifdef CONFIG_HIGHMEM
 389         total += highend_pfn - highstart_pfn;
 390 #endif
 391
 392         return total << PAGE_SHIFT;
 393 }
 394
 395 #ifdef CONFIG_KEXEC
 396 static void __init reserve_crashkernel(void)
 397 {
 398         unsigned long long total_mem;
 399         unsigned long long crash_size, crash_base;
 400         int ret;
 401
 402         total_mem = get_total_mem();
 403
 404         ret = parse_crashkernel(boot_command_line, total_mem,
 405                         &crash_size, &crash_base);
 406         if (ret == 0 && crash_size > 0) {
 407                 if (crash_base > 0) {
 408                         printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
 409                                         "for crashkernel (System RAM: %ldMB)\n",
 410                                         (unsigned long)(crash_size >> 20),
 411                                         (unsigned long)(crash_base >> 20),
 412                                         (unsigned long)(total_mem >> 20));
 413                         crashk_res.start = crash_base;
 414                         crashk_res.end   = crash_base + crash_size - 1;
 415                         reserve_bootmem(crash_base, crash_size);
 416                 } else
 417                         printk(KERN_INFO "crashkernel reservation failed - "
 418                                         "you have to specify a base address\n");
 419         }
 420 }
 421 #else
 422 static inline void __init reserve_crashkernel(void)
 423 {}
 424 #endif
 425
 426 void __init setup_bootmem_allocator(void)
 427 {
 428         unsigned long bootmap_size;
 429         /*
 430          * Initialize the boot-time allocator (with low memory only):
 431          */
 432         bootmap_size = init_bootmem(min_low_pfn, max_low_pfn);
 433
 434         register_bootmem_low_pages(max_low_pfn);
 435
 436         /*
 437          * Reserve the bootmem bitmap itself as well. We do this in two
 438          * steps (first step was init_bootmem()) because this catches
 439          * the (very unlikely) case of us accidentally initializing the
 440          * bootmem allocator with an invalid RAM area.
 441          */
 442         reserve_bootmem(__pa_symbol(_text), (PFN_PHYS(min_low_pfn) +
 443                          bootmap_size + PAGE_SIZE-1) - __pa_symbol(_text));
 444
 445         /*
 446          * reserve physical page 0 - it's a special BIOS page on many boxes,
 447          * enabling clean reboots, SMP operation, laptop functions.
 448          */
 449         reserve_bootmem(0, PAGE_SIZE);
 450
 451         /* reserve EBDA region, it's a 4K region */
 452         reserve_ebda_region();
 453
 454     /* could be an AMD 768MPX chipset. Reserve a page  before VGA to prevent
 455        PCI prefetch into it (errata #56). Usually the page is reserved anyways,
 456        unless you have no PS/2 mouse plugged in. */
 457         if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
 458             boot_cpu_data.x86 == 6)
 459              reserve_bootmem(0xa0000 - 4096, 4096);
 460
 461 #ifdef CONFIG_SMP
 462         /*
 463          * But first pinch a few for the stack/trampoline stuff
 464          * FIXME: Don't need the extra page at 4K, but need to fix
 465          * trampoline before removing it. (see the GDT stuff)
 466          */
 467         reserve_bootmem(PAGE_SIZE, PAGE_SIZE);
 468 #endif
 469 #ifdef CONFIG_ACPI_SLEEP
 470         /*
 471          * Reserve low memory region for sleep support.
 472          */
 473         acpi_reserve_bootmem();
 474 #endif
 475 #ifdef CONFIG_X86_FIND_SMP_CONFIG
 476         /*
 477          * Find and reserve possible boot-time SMP configuration:
 478          */
 479         find_smp_config();
 480 #endif
 481         numa_kva_reserve();
 482 #ifdef CONFIG_BLK_DEV_INITRD
 483         if (boot_params.hdr.type_of_loader && boot_params.hdr.ramdisk_image) {
 484                 unsigned long ramdisk_image = boot_params.hdr.ramdisk_image;
 485                 unsigned long ramdisk_size  = boot_params.hdr.ramdisk_size;
 486                 unsigned long ramdisk_end   = ramdisk_image + ramdisk_size;
 487                 unsigned long end_of_lowmem = max_low_pfn << PAGE_SHIFT;
 488
 489                 if (ramdisk_end <= end_of_lowmem) {
 490                         reserve_bootmem(ramdisk_image, ramdisk_size);
 491                         initrd_start = ramdisk_image + PAGE_OFFSET;
 492                         initrd_end = initrd_start+ramdisk_size;
 493                 } else {
 494                         printk(KERN_ERR "initrd extends beyond end of memory "
 495                                "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 496                                ramdisk_end, end_of_lowmem);
 497                         initrd_start = 0;
 498                 }
 499         }
 500 #endif
 501         reserve_crashkernel();
 502 }
 503
 504 /*
 505  * The node 0 pgdat is initialized before all of these because
 506  * it's needed for bootmem.  node>0 pgdats have their virtual
 507  * space allocated before the pagetables are in place to access
 508  * them, so they can't be cleared then.
 509  *
 510  * This should all compile down to nothing when NUMA is off.
 511  */
 512 static void __init remapped_pgdat_init(void)
 513 {
 514         int nid;
 515
 516         for_each_online_node(nid) {
 517                 if (nid != 0)
 518                         memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
 519         }
 520 }
 521
 522 #ifdef CONFIG_MCA
 523 static void set_mca_bus(int x)
 524 {
 525         MCA_bus = x;
 526 }
 527 #else
 528 static void set_mca_bus(int x) { }
 529 #endif
 530
 531 /* Overridden in paravirt.c if CONFIG_PARAVIRT */
 532 char * __init __attribute__((weak)) memory_setup(void)
 533 {
 534         return machine_specific_memory_setup();
 535 }
 536
 537 /*
 538  * Determine if we were loaded by an EFI loader.  If so, then we have also been
 539  * passed the efi memmap, systab, etc., so we should use these data structures
 540  * for initialization.  Note, the efi init code path is determined by the
 541  * global efi_enabled. This allows the same kernel image to be used on existing
 542  * systems (with a traditional BIOS) as well as on EFI systems.
 543  */
 544 void __init setup_arch(char **cmdline_p)
 545 {
 546         unsigned long max_low_pfn;
 547
 548         memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
 549         pre_setup_arch_hook();
 550         early_cpu_init();
 551
 552         /*
 553          * FIXME: This isn't an official loader_type right
 554          * now but does currently work with elilo.
 555          * If we were configured as an EFI kernel, check to make
 556          * sure that we were loaded correctly from elilo and that
 557          * the system table is valid.  If not, then initialize normally.
 558          */
 559 #ifdef CONFIG_EFI
 560         if ((boot_params.hdr.type_of_loader == 0x50) &&
 561             boot_params.efi_info.efi_systab)
 562                 efi_enabled = 1;
 563 #endif
 564
 565         ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
 566         screen_info = boot_params.screen_info;
 567         edid_info = boot_params.edid_info;
 568         apm_info.bios = boot_params.apm_bios_info;
 569         ist_info = boot_params.ist_info;
 570         saved_videomode = boot_params.hdr.vid_mode;
 571         if( boot_params.sys_desc_table.length != 0 ) {
 572                 set_mca_bus(boot_params.sys_desc_table.table[3] & 0x2);
 573                 machine_id = boot_params.sys_desc_table.table[0];
 574                 machine_submodel_id = boot_params.sys_desc_table.table[1];
 575                 BIOS_revision = boot_params.sys_desc_table.table[2];
 576         }
 577         bootloader_type = boot_params.hdr.type_of_loader;
 578
 579 #ifdef CONFIG_BLK_DEV_RAM
 580         rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
 581         rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
 582         rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
 583 #endif
 584         ARCH_SETUP
 585         if (efi_enabled)
 586                 efi_init();
 587         else {
 588                 printk(KERN_INFO "BIOS-provided physical RAM map:\n");
 589                 print_memory_map(memory_setup());
 590         }
 591
 592         copy_edd();
 593
 594         if (!boot_params.hdr.root_flags)
 595                 root_mountflags &= ~MS_RDONLY;
 596         init_mm.start_code = (unsigned long) _text;
 597         init_mm.end_code = (unsigned long) _etext;
 598         init_mm.end_data = (unsigned long) _edata;
 599         init_mm.brk = init_pg_tables_end + PAGE_OFFSET;
 600
 601         code_resource.start = virt_to_phys(_text);
 602         code_resource.end = virt_to_phys(_etext)-1;
 603         data_resource.start = virt_to_phys(_etext);
 604         data_resource.end = virt_to_phys(_edata)-1;
 605         bss_resource.start = virt_to_phys(&__bss_start);
 606         bss_resource.end = virt_to_phys(&__bss_stop)-1;
 607
 608         parse_early_param();
 609
 610         if (user_defined_memmap) {
 611                 printk(KERN_INFO "user-defined physical RAM map:\n");
 612                 print_memory_map("user");
 613         }
 614
 615         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 616         *cmdline_p = command_line;
 617
 618         max_low_pfn = setup_memory();
 619
 620 #ifdef CONFIG_VMI
 621         /*
 622          * Must be after max_low_pfn is determined, and before kernel
 623          * pagetables are setup.
 624          */
 625         vmi_init();
 626 #endif
 627
 628         /*
 629          * NOTE: before this point _nobody_ is allowed to allocate
 630          * any memory using the bootmem allocator.  Although the
 631          * allocator is now initialised only the first 8Mb of the kernel
 632          * virtual address space has been mapped.  All allocations before
 633          * paging_init() has completed must use the alloc_bootmem_low_pages()
 634          * variant (which allocates DMA'able memory) and care must be taken
 635          * not to exceed the 8Mb limit.
 636          */
 637
 638 #ifdef CONFIG_SMP
 639         smp_alloc_memory(); /* AP processor realmode stacks in low memory*/
 640 #endif
 641         paging_init();
 642         remapped_pgdat_init();
 643         sparse_init();
 644         zone_sizes_init();
 645
 646         /*
 647          * NOTE: at this point the bootmem allocator is fully available.
 648          */
 649
 650         paravirt_post_allocator_init();
 651
 652         dmi_scan_machine();
 653
 654 #ifdef CONFIG_X86_GENERICARCH
 655         generic_apic_probe();
 656 #endif
 657         if (efi_enabled)
 658                 efi_map_memmap();
 659
 660 #ifdef CONFIG_ACPI
 661         /*
 662          * Parse the ACPI tables for possible boot-time SMP configuration.
 663          */
 664         acpi_boot_table_init();
 665 #endif
 666
 667 #ifdef CONFIG_PCI
 668         early_quirks();
 669 #endif
 670
 671 #ifdef CONFIG_ACPI
 672         acpi_boot_init();
 673
 674 #if defined(CONFIG_SMP) && defined(CONFIG_X86_PC)
 675         if (def_to_bigsmp)
 676                 printk(KERN_WARNING "More than 8 CPUs detected and "
 677                         "CONFIG_X86_PC cannot handle it.\nUse "
 678                         "CONFIG_X86_GENERICARCH or CONFIG_X86_BIGSMP.\n");
 679 #endif
 680 #endif
 681 #ifdef CONFIG_X86_LOCAL_APIC
 682         if (smp_found_config)
 683                 get_smp_config();
 684 #endif
 685
 686         e820_register_memory();
 687         e820_mark_nosave_regions();
 688
 689 #ifdef CONFIG_VT
 690 #if defined(CONFIG_VGA_CONSOLE)
 691         if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
 692                 conswitchp = &vga_con;
 693 #elif defined(CONFIG_DUMMY_CONSOLE)
 694         conswitchp = &dummy_con;
 695 #endif
 696 #endif
 697 }