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 __cpuinitdata = 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 unsigned int machine_submodel_id;
  90 unsigned int BIOS_revision;
  91 unsigned int mca_pentium_flag;
  92
  93 /* Boot loader ID as an integer, for the benefit of proc_dointvec */
  94 int bootloader_type;
  95
  96 /* user-defined highmem size */
  97 static unsigned int highmem_pages = -1;
  98
  99 /*
 100  * Setup options
 101  */
 102 struct screen_info screen_info;
 103 EXPORT_SYMBOL(screen_info);
 104 struct apm_info apm_info;
 105 EXPORT_SYMBOL(apm_info);
 106 struct edid_info edid_info;
 107 EXPORT_SYMBOL_GPL(edid_info);
 108 struct ist_info ist_info;
 109 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
 110         defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
 111 EXPORT_SYMBOL(ist_info);
 112 #endif
 113
 114 extern void early_cpu_init(void);
 115 extern int root_mountflags;
 116
 117 unsigned long saved_videomode;
 118
 119 #define RAMDISK_IMAGE_START_MASK        0x07FF
 120 #define RAMDISK_PROMPT_FLAG             0x8000
 121 #define RAMDISK_LOAD_FLAG               0x4000
 122
 123 static char __initdata command_line[COMMAND_LINE_SIZE];
 124
 125 struct boot_params __initdata boot_params;
 126
 127 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
 128 struct edd edd;
 129 #ifdef CONFIG_EDD_MODULE
 130 EXPORT_SYMBOL(edd);
 131 #endif
 132 /**
 133  * copy_edd() - Copy the BIOS EDD information
 134  *              from boot_params into a safe place.
 135  *
 136  */
 137 static inline void copy_edd(void)
 138 {
 139      memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
 140             sizeof(edd.mbr_signature));
 141      memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
 142      edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
 143      edd.edd_info_nr = boot_params.eddbuf_entries;
 144 }
 145 #else
 146 static inline void copy_edd(void)
 147 {
 148 }
 149 #endif
 150
 151 int __initdata user_defined_memmap = 0;
 152
 153 /*
 154  * "mem=nopentium" disables the 4MB page tables.
 155  * "mem=XXX[kKmM]" defines a memory region from HIGH_MEM
 156  * to <mem>, overriding the bios size.
 157  * "memmap=XXX[KkmM]@XXX[KkmM]" defines a memory region from
 158  * <start> to <start>+<mem>, overriding the bios size.
 159  *
 160  * HPA tells me bootloaders need to parse mem=, so no new
 161  * option should be mem=  [also see Documentation/i386/boot.txt]
 162  */
 163 static int __init parse_mem(char *arg)
 164 {
 165         if (!arg)
 166                 return -EINVAL;
 167
 168         if (strcmp(arg, "nopentium") == 0) {
 169                 clear_bit(X86_FEATURE_PSE, boot_cpu_data.x86_capability);
 170                 disable_pse = 1;
 171         } else {
 172                 /* If the user specifies memory size, we
 173                  * limit the BIOS-provided memory map to
 174                  * that size. exactmap can be used to specify
 175                  * the exact map. mem=number can be used to
 176                  * trim the existing memory map.
 177                  */
 178                 unsigned long long mem_size;
 179
 180                 mem_size = memparse(arg, &arg);
 181                 limit_regions(mem_size);
 182                 user_defined_memmap = 1;
 183         }
 184         return 0;
 185 }
 186 early_param("mem", parse_mem);
 187
 188 #ifdef CONFIG_PROC_VMCORE
 189 /* elfcorehdr= specifies the location of elf core header
 190  * stored by the crashed kernel.
 191  */
 192 static int __init parse_elfcorehdr(char *arg)
 193 {
 194         if (!arg)
 195                 return -EINVAL;
 196
 197         elfcorehdr_addr = memparse(arg, &arg);
 198         return 0;
 199 }
 200 early_param("elfcorehdr", parse_elfcorehdr);
 201 #endif /* CONFIG_PROC_VMCORE */
 202
 203 /*
 204  * highmem=size forces highmem to be exactly 'size' bytes.
 205  * This works even on boxes that have no highmem otherwise.
 206  * This also works to reduce highmem size on bigger boxes.
 207  */
 208 static int __init parse_highmem(char *arg)
 209 {
 210         if (!arg)
 211                 return -EINVAL;
 212
 213         highmem_pages = memparse(arg, &arg) >> PAGE_SHIFT;
 214         return 0;
 215 }
 216 early_param("highmem", parse_highmem);
 217
 218 /*
 219  * vmalloc=size forces the vmalloc area to be exactly 'size'
 220  * bytes. This can be used to increase (or decrease) the
 221  * vmalloc area - the default is 128m.
 222  */
 223 static int __init parse_vmalloc(char *arg)
 224 {
 225         if (!arg)
 226                 return -EINVAL;
 227
 228         __VMALLOC_RESERVE = memparse(arg, &arg);
 229         return 0;
 230 }
 231 early_param("vmalloc", parse_vmalloc);
 232
 233 /*
 234  * reservetop=size reserves a hole at the top of the kernel address space which
 235  * a hypervisor can load into later.  Needed for dynamically loaded hypervisors,
 236  * so relocating the fixmap can be done before paging initialization.
 237  */
 238 static int __init parse_reservetop(char *arg)
 239 {
 240         unsigned long address;
 241
 242         if (!arg)
 243                 return -EINVAL;
 244
 245         address = memparse(arg, &arg);
 246         reserve_top_address(address);
 247         return 0;
 248 }
 249 early_param("reservetop", parse_reservetop);
 250
 251 /*
 252  * Determine low and high memory ranges:
 253  */
 254 unsigned long __init find_max_low_pfn(void)
 255 {
 256         unsigned long max_low_pfn;
 257
 258         max_low_pfn = max_pfn;
 259         if (max_low_pfn > MAXMEM_PFN) {
 260                 if (highmem_pages == -1)
 261                         highmem_pages = max_pfn - MAXMEM_PFN;
 262                 if (highmem_pages + MAXMEM_PFN < max_pfn)
 263                         max_pfn = MAXMEM_PFN + highmem_pages;
 264                 if (highmem_pages + MAXMEM_PFN > max_pfn) {
 265                         printk("only %luMB highmem pages available, ignoring highmem size of %uMB.\n", pages_to_mb(max_pfn - MAXMEM_PFN), pages_to_mb(highmem_pages));
 266                         highmem_pages = 0;
 267                 }
 268                 max_low_pfn = MAXMEM_PFN;
 269 #ifndef CONFIG_HIGHMEM
 270                 /* Maximum memory usable is what is directly addressable */
 271                 printk(KERN_WARNING "Warning only %ldMB will be used.\n",
 272                                         MAXMEM>>20);
 273                 if (max_pfn > MAX_NONPAE_PFN)
 274                         printk(KERN_WARNING "Use a HIGHMEM64G enabled kernel.\n");
 275                 else
 276                         printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
 277                 max_pfn = MAXMEM_PFN;
 278 #else /* !CONFIG_HIGHMEM */
 279 #ifndef CONFIG_HIGHMEM64G
 280                 if (max_pfn > MAX_NONPAE_PFN) {
 281                         max_pfn = MAX_NONPAE_PFN;
 282                         printk(KERN_WARNING "Warning only 4GB will be used.\n");
 283                         printk(KERN_WARNING "Use a HIGHMEM64G enabled kernel.\n");
 284                 }
 285 #endif /* !CONFIG_HIGHMEM64G */
 286 #endif /* !CONFIG_HIGHMEM */
 287         } else {
 288                 if (highmem_pages == -1)
 289                         highmem_pages = 0;
 290 #ifdef CONFIG_HIGHMEM
 291                 if (highmem_pages >= max_pfn) {
 292                         printk(KERN_ERR "highmem size specified (%uMB) is bigger than pages available (%luMB)!.\n", pages_to_mb(highmem_pages), pages_to_mb(max_pfn));
 293                         highmem_pages = 0;
 294                 }
 295                 if (highmem_pages) {
 296                         if (max_low_pfn-highmem_pages < 64*1024*1024/PAGE_SIZE){
 297                                 printk(KERN_ERR "highmem size %uMB results in smaller than 64MB lowmem, ignoring it.\n", pages_to_mb(highmem_pages));
 298                                 highmem_pages = 0;
 299                         }
 300                         max_low_pfn -= highmem_pages;
 301                 }
 302 #else
 303                 if (highmem_pages)
 304                         printk(KERN_ERR "ignoring highmem size on non-highmem kernel!\n");
 305 #endif
 306         }
 307         return max_low_pfn;
 308 }
 309
 310 /*
 311  * workaround for Dell systems that neglect to reserve EBDA
 312  */
 313 static void __init reserve_ebda_region(void)
 314 {
 315         unsigned int addr;
 316         addr = get_bios_ebda();
 317         if (addr)
 318                 reserve_bootmem(addr, PAGE_SIZE);
 319 }
 320
 321 #ifndef CONFIG_NEED_MULTIPLE_NODES
 322 void __init setup_bootmem_allocator(void);
 323 static unsigned long __init setup_memory(void)
 324 {
 325         /*
 326          * partially used pages are not usable - thus
 327          * we are rounding upwards:
 328          */
 329         min_low_pfn = PFN_UP(init_pg_tables_end);
 330
 331         find_max_pfn();
 332
 333         max_low_pfn = find_max_low_pfn();
 334
 335 #ifdef CONFIG_HIGHMEM
 336         highstart_pfn = highend_pfn = max_pfn;
 337         if (max_pfn > max_low_pfn) {
 338                 highstart_pfn = max_low_pfn;
 339         }
 340         printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
 341                 pages_to_mb(highend_pfn - highstart_pfn));
 342         num_physpages = highend_pfn;
 343         high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1;
 344 #else
 345         num_physpages = max_low_pfn;
 346         high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1;
 347 #endif
 348 #ifdef CONFIG_FLATMEM
 349         max_mapnr = num_physpages;
 350 #endif
 351         printk(KERN_NOTICE "%ldMB LOWMEM available.\n",
 352                         pages_to_mb(max_low_pfn));
 353
 354         setup_bootmem_allocator();
 355
 356         return max_low_pfn;
 357 }
 358
 359 void __init zone_sizes_init(void)
 360 {
 361         unsigned long max_zone_pfns[MAX_NR_ZONES];
 362         memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
 363         max_zone_pfns[ZONE_DMA] =
 364                 virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
 365         max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
 366 #ifdef CONFIG_HIGHMEM
 367         max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
 368         add_active_range(0, 0, highend_pfn);
 369 #else
 370         add_active_range(0, 0, max_low_pfn);
 371 #endif
 372
 373         free_area_init_nodes(max_zone_pfns);
 374 }
 375 #else
 376 extern unsigned long __init setup_memory(void);
 377 extern void zone_sizes_init(void);
 378 #endif /* !CONFIG_NEED_MULTIPLE_NODES */
 379
 380 static inline unsigned long long get_total_mem(void)
 381 {
 382         unsigned long long total;
 383
 384         total = max_low_pfn - min_low_pfn;
 385 #ifdef CONFIG_HIGHMEM
 386         total += highend_pfn - highstart_pfn;
 387 #endif
 388
 389         return total << PAGE_SHIFT;
 390 }
 391
 392 #ifdef CONFIG_KEXEC
 393 static void __init reserve_crashkernel(void)
 394 {
 395         unsigned long long total_mem;
 396         unsigned long long crash_size, crash_base;
 397         int ret;
 398
 399         total_mem = get_total_mem();
 400
 401         ret = parse_crashkernel(boot_command_line, total_mem,
 402                         &crash_size, &crash_base);
 403         if (ret == 0 && crash_size > 0) {
 404                 if (crash_base > 0) {
 405                         printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
 406                                         "for crashkernel (System RAM: %ldMB)\n",
 407                                         (unsigned long)(crash_size >> 20),
 408                                         (unsigned long)(crash_base >> 20),
 409                                         (unsigned long)(total_mem >> 20));
 410                         crashk_res.start = crash_base;
 411                         crashk_res.end   = crash_base + crash_size - 1;
 412                         reserve_bootmem(crash_base, crash_size);
 413                 } else
 414                         printk(KERN_INFO "crashkernel reservation failed - "
 415                                         "you have to specify a base address\n");
 416         }
 417 }
 418 #else
 419 static inline void __init reserve_crashkernel(void)
 420 {}
 421 #endif
 422
 423 void __init setup_bootmem_allocator(void)
 424 {
 425         unsigned long bootmap_size;
 426         /*
 427          * Initialize the boot-time allocator (with low memory only):
 428          */
 429         bootmap_size = init_bootmem(min_low_pfn, max_low_pfn);
 430
 431         register_bootmem_low_pages(max_low_pfn);
 432
 433         /*
 434          * Reserve the bootmem bitmap itself as well. We do this in two
 435          * steps (first step was init_bootmem()) because this catches
 436          * the (very unlikely) case of us accidentally initializing the
 437          * bootmem allocator with an invalid RAM area.
 438          */
 439         reserve_bootmem(__pa_symbol(_text), (PFN_PHYS(min_low_pfn) +
 440                          bootmap_size + PAGE_SIZE-1) - __pa_symbol(_text));
 441
 442         /*
 443          * reserve physical page 0 - it's a special BIOS page on many boxes,
 444          * enabling clean reboots, SMP operation, laptop functions.
 445          */
 446         reserve_bootmem(0, PAGE_SIZE);
 447
 448         /* reserve EBDA region, it's a 4K region */
 449         reserve_ebda_region();
 450
 451     /* could be an AMD 768MPX chipset. Reserve a page  before VGA to prevent
 452        PCI prefetch into it (errata #56). Usually the page is reserved anyways,
 453        unless you have no PS/2 mouse plugged in. */
 454         if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
 455             boot_cpu_data.x86 == 6)
 456              reserve_bootmem(0xa0000 - 4096, 4096);
 457
 458 #ifdef CONFIG_SMP
 459         /*
 460          * But first pinch a few for the stack/trampoline stuff
 461          * FIXME: Don't need the extra page at 4K, but need to fix
 462          * trampoline before removing it. (see the GDT stuff)
 463          */
 464         reserve_bootmem(PAGE_SIZE, PAGE_SIZE);
 465 #endif
 466 #ifdef CONFIG_ACPI_SLEEP
 467         /*
 468          * Reserve low memory region for sleep support.
 469          */
 470         acpi_reserve_bootmem();
 471 #endif
 472 #ifdef CONFIG_X86_FIND_SMP_CONFIG
 473         /*
 474          * Find and reserve possible boot-time SMP configuration:
 475          */
 476         find_smp_config();
 477 #endif
 478         numa_kva_reserve();
 479 #ifdef CONFIG_BLK_DEV_INITRD
 480         if (boot_params.hdr.type_of_loader && boot_params.hdr.ramdisk_image) {
 481                 unsigned long ramdisk_image = boot_params.hdr.ramdisk_image;
 482                 unsigned long ramdisk_size  = boot_params.hdr.ramdisk_size;
 483                 unsigned long ramdisk_end   = ramdisk_image + ramdisk_size;
 484                 unsigned long end_of_lowmem = max_low_pfn << PAGE_SHIFT;
 485
 486                 if (ramdisk_end <= end_of_lowmem) {
 487                         reserve_bootmem(ramdisk_image, ramdisk_size);
 488                         initrd_start = ramdisk_image + PAGE_OFFSET;
 489                         initrd_end = initrd_start+ramdisk_size;
 490                 } else {
 491                         printk(KERN_ERR "initrd extends beyond end of memory "
 492                                "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 493                                ramdisk_end, end_of_lowmem);
 494                         initrd_start = 0;
 495                 }
 496         }
 497 #endif
 498         reserve_crashkernel();
 499 }
 500
 501 /*
 502  * The node 0 pgdat is initialized before all of these because
 503  * it's needed for bootmem.  node>0 pgdats have their virtual
 504  * space allocated before the pagetables are in place to access
 505  * them, so they can't be cleared then.
 506  *
 507  * This should all compile down to nothing when NUMA is off.
 508  */
 509 static void __init remapped_pgdat_init(void)
 510 {
 511         int nid;
 512
 513         for_each_online_node(nid) {
 514                 if (nid != 0)
 515                         memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
 516         }
 517 }
 518
 519 #ifdef CONFIG_MCA
 520 static void set_mca_bus(int x)
 521 {
 522         MCA_bus = x;
 523 }
 524 #else
 525 static void set_mca_bus(int x) { }
 526 #endif
 527
 528 /* Overridden in paravirt.c if CONFIG_PARAVIRT */
 529 char * __init __attribute__((weak)) memory_setup(void)
 530 {
 531         return machine_specific_memory_setup();
 532 }
 533
 534 /*
 535  * Determine if we were loaded by an EFI loader.  If so, then we have also been
 536  * passed the efi memmap, systab, etc., so we should use these data structures
 537  * for initialization.  Note, the efi init code path is determined by the
 538  * global efi_enabled. This allows the same kernel image to be used on existing
 539  * systems (with a traditional BIOS) as well as on EFI systems.
 540  */
 541 void __init setup_arch(char **cmdline_p)
 542 {
 543         unsigned long max_low_pfn;
 544
 545         memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
 546         pre_setup_arch_hook();
 547         early_cpu_init();
 548
 549         /*
 550          * FIXME: This isn't an official loader_type right
 551          * now but does currently work with elilo.
 552          * If we were configured as an EFI kernel, check to make
 553          * sure that we were loaded correctly from elilo and that
 554          * the system table is valid.  If not, then initialize normally.
 555          */
 556 #ifdef CONFIG_EFI
 557         if ((boot_params.hdr.type_of_loader == 0x50) &&
 558             boot_params.efi_info.efi_systab)
 559                 efi_enabled = 1;
 560 #endif
 561
 562         ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
 563         screen_info = boot_params.screen_info;
 564         edid_info = boot_params.edid_info;
 565         apm_info.bios = boot_params.apm_bios_info;
 566         ist_info = boot_params.ist_info;
 567         saved_videomode = boot_params.hdr.vid_mode;
 568         if( boot_params.sys_desc_table.length != 0 ) {
 569                 set_mca_bus(boot_params.sys_desc_table.table[3] & 0x2);
 570                 machine_id = boot_params.sys_desc_table.table[0];
 571                 machine_submodel_id = boot_params.sys_desc_table.table[1];
 572                 BIOS_revision = boot_params.sys_desc_table.table[2];
 573         }
 574         bootloader_type = boot_params.hdr.type_of_loader;
 575
 576 #ifdef CONFIG_BLK_DEV_RAM
 577         rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
 578         rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
 579         rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
 580 #endif
 581         ARCH_SETUP
 582         if (efi_enabled)
 583                 efi_init();
 584         else {
 585                 printk(KERN_INFO "BIOS-provided physical RAM map:\n");
 586                 print_memory_map(memory_setup());
 587         }
 588
 589         copy_edd();
 590
 591         if (!boot_params.hdr.root_flags)
 592                 root_mountflags &= ~MS_RDONLY;
 593         init_mm.start_code = (unsigned long) _text;
 594         init_mm.end_code = (unsigned long) _etext;
 595         init_mm.end_data = (unsigned long) _edata;
 596         init_mm.brk = init_pg_tables_end + PAGE_OFFSET;
 597
 598         code_resource.start = virt_to_phys(_text);
 599         code_resource.end = virt_to_phys(_etext)-1;
 600         data_resource.start = virt_to_phys(_etext);
 601         data_resource.end = virt_to_phys(_edata)-1;
 602         bss_resource.start = virt_to_phys(&__bss_start);
 603         bss_resource.end = virt_to_phys(&__bss_stop)-1;
 604
 605         parse_early_param();
 606
 607         if (user_defined_memmap) {
 608                 printk(KERN_INFO "user-defined physical RAM map:\n");
 609                 print_memory_map("user");
 610         }
 611
 612         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 613         *cmdline_p = command_line;
 614
 615         max_low_pfn = setup_memory();
 616
 617 #ifdef CONFIG_VMI
 618         /*
 619          * Must be after max_low_pfn is determined, and before kernel
 620          * pagetables are setup.
 621          */
 622         vmi_init();
 623 #endif
 624
 625         /*
 626          * NOTE: before this point _nobody_ is allowed to allocate
 627          * any memory using the bootmem allocator.  Although the
 628          * allocator is now initialised only the first 8Mb of the kernel
 629          * virtual address space has been mapped.  All allocations before
 630          * paging_init() has completed must use the alloc_bootmem_low_pages()
 631          * variant (which allocates DMA'able memory) and care must be taken
 632          * not to exceed the 8Mb limit.
 633          */
 634
 635 #ifdef CONFIG_SMP
 636         smp_alloc_memory(); /* AP processor realmode stacks in low memory*/
 637 #endif
 638         paging_init();
 639         remapped_pgdat_init();
 640         sparse_init();
 641         zone_sizes_init();
 642
 643         /*
 644          * NOTE: at this point the bootmem allocator is fully available.
 645          */
 646
 647         paravirt_post_allocator_init();
 648
 649         dmi_scan_machine();
 650
 651         io_delay_init();;
 652
 653 #ifdef CONFIG_X86_GENERICARCH
 654         generic_apic_probe();
 655 #endif
 656         if (efi_enabled)
 657                 efi_map_memmap();
 658
 659 #ifdef CONFIG_ACPI
 660         /*
 661          * Parse the ACPI tables for possible boot-time SMP configuration.
 662          */
 663         acpi_boot_table_init();
 664 #endif
 665
 666 #ifdef CONFIG_PCI
 667         early_quirks();
 668 #endif
 669
 670 #ifdef CONFIG_ACPI
 671         acpi_boot_init();
 672
 673 #if defined(CONFIG_SMP) && defined(CONFIG_X86_PC)
 674         if (def_to_bigsmp)
 675                 printk(KERN_WARNING "More than 8 CPUs detected and "
 676                         "CONFIG_X86_PC cannot handle it.\nUse "
 677                         "CONFIG_X86_GENERICARCH or CONFIG_X86_BIGSMP.\n");
 678 #endif
 679 #endif
 680 #ifdef CONFIG_X86_LOCAL_APIC
 681         if (smp_found_config)
 682                 get_smp_config();
 683 #endif
 684
 685         e820_register_memory();
 686         e820_mark_nosave_regions();
 687
 688 #ifdef CONFIG_VT
 689 #if defined(CONFIG_VGA_CONSOLE)
 690         if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
 691                 conswitchp = &vga_con;
 692 #elif defined(CONFIG_DUMMY_CONSOLE)
 693         conswitchp = &dummy_con;
 694 #endif
 695 #endif
 696 }