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 #include <linux/pci.h>
  48
  49 #include <video/edid.h>
  50
  51 #include <asm/apic.h>
  52 #include <asm/e820.h>
  53 #include <asm/mpspec.h>
  54 #include <asm/mmzone.h>
  55 #include <asm/setup.h>
  56 #include <asm/arch_hooks.h>
  57 #include <asm/sections.h>
  58 #include <asm/io_apic.h>
  59 #include <asm/ist.h>
  60 #include <asm/io.h>
  61 #include <asm/vmi.h>
  62 #include <setup_arch.h>
  63 #include <bios_ebda.h>
  64 #include <asm/cacheflush.h>
  65
  66 /* This value is set up by the early boot code to point to the value
  67    immediately after the boot time page tables.  It contains a *physical*
  68    address, and must not be in the .bss segment! */
  69 unsigned long init_pg_tables_end __initdata = ~0UL;
  70
  71 int disable_pse __cpuinitdata = 0;
  72
  73 /*
  74  * Machine setup..
  75  */
  76 static struct resource data_resource = {
  77         .name   = "Kernel data",
  78         .start  = 0,
  79         .end    = 0,
  80         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
  81 };
  82
  83 static struct resource code_resource = {
  84         .name   = "Kernel code",
  85         .start  = 0,
  86         .end    = 0,
  87         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
  88 };
  89
  90 static struct resource bss_resource = {
  91         .name   = "Kernel bss",
  92         .start  = 0,
  93         .end    = 0,
  94         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
  95 };
  96
  97 static struct resource video_ram_resource = {
  98         .name   = "Video RAM area",
  99         .start  = 0xa0000,
 100         .end    = 0xbffff,
 101         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 102 };
 103
 104 static struct resource standard_io_resources[] = { {
 105         .name   = "dma1",
 106         .start  = 0x0000,
 107         .end    = 0x001f,
 108         .flags  = IORESOURCE_BUSY | IORESOURCE_IO
 109 }, {
 110         .name   = "pic1",
 111         .start  = 0x0020,
 112         .end    = 0x0021,
 113         .flags  = IORESOURCE_BUSY | IORESOURCE_IO
 114 }, {
 115         .name   = "timer0",
 116         .start  = 0x0040,
 117         .end    = 0x0043,
 118         .flags  = IORESOURCE_BUSY | IORESOURCE_IO
 119 }, {
 120         .name   = "timer1",
 121         .start  = 0x0050,
 122         .end    = 0x0053,
 123         .flags  = IORESOURCE_BUSY | IORESOURCE_IO
 124 }, {
 125         .name   = "keyboard",
 126         .start  = 0x0060,
 127         .end    = 0x006f,
 128         .flags  = IORESOURCE_BUSY | IORESOURCE_IO
 129 }, {
 130         .name   = "dma page reg",
 131         .start  = 0x0080,
 132         .end    = 0x008f,
 133         .flags  = IORESOURCE_BUSY | IORESOURCE_IO
 134 }, {
 135         .name   = "pic2",
 136         .start  = 0x00a0,
 137         .end    = 0x00a1,
 138         .flags  = IORESOURCE_BUSY | IORESOURCE_IO
 139 }, {
 140         .name   = "dma2",
 141         .start  = 0x00c0,
 142         .end    = 0x00df,
 143         .flags  = IORESOURCE_BUSY | IORESOURCE_IO
 144 }, {
 145         .name   = "fpu",
 146         .start  = 0x00f0,
 147         .end    = 0x00ff,
 148         .flags  = IORESOURCE_BUSY | IORESOURCE_IO
 149 } };
 150
 151 /* cpu data as detected by the assembly code in head.S */
 152 struct cpuinfo_x86 new_cpu_data __cpuinitdata = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
 153 /* common cpu data for all cpus */
 154 struct cpuinfo_x86 boot_cpu_data __read_mostly = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
 155 EXPORT_SYMBOL(boot_cpu_data);
 156
 157 unsigned long mmu_cr4_features;
 158
 159 /* for MCA, but anyone else can use it if they want */
 160 unsigned int machine_id;
 161 unsigned int machine_submodel_id;
 162 unsigned int BIOS_revision;
 163 unsigned int mca_pentium_flag;
 164
 165 /* Boot loader ID as an integer, for the benefit of proc_dointvec */
 166 int bootloader_type;
 167
 168 /* user-defined highmem size */
 169 static unsigned int highmem_pages = -1;
 170
 171 /*
 172  * Setup options
 173  */
 174 struct screen_info screen_info;
 175 EXPORT_SYMBOL(screen_info);
 176 struct apm_info apm_info;
 177 EXPORT_SYMBOL(apm_info);
 178 struct edid_info edid_info;
 179 EXPORT_SYMBOL_GPL(edid_info);
 180 struct ist_info ist_info;
 181 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
 182         defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
 183 EXPORT_SYMBOL(ist_info);
 184 #endif
 185
 186 extern void early_cpu_init(void);
 187 extern int root_mountflags;
 188
 189 unsigned long saved_videomode;
 190
 191 #define RAMDISK_IMAGE_START_MASK        0x07FF
 192 #define RAMDISK_PROMPT_FLAG             0x8000
 193 #define RAMDISK_LOAD_FLAG               0x4000
 194
 195 static char __initdata command_line[COMMAND_LINE_SIZE];
 196
 197 struct boot_params __initdata boot_params;
 198
 199 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
 200 struct edd edd;
 201 #ifdef CONFIG_EDD_MODULE
 202 EXPORT_SYMBOL(edd);
 203 #endif
 204 /**
 205  * copy_edd() - Copy the BIOS EDD information
 206  *              from boot_params into a safe place.
 207  *
 208  */
 209 static inline void copy_edd(void)
 210 {
 211      memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
 212             sizeof(edd.mbr_signature));
 213      memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
 214      edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
 215      edd.edd_info_nr = boot_params.eddbuf_entries;
 216 }
 217 #else
 218 static inline void copy_edd(void)
 219 {
 220 }
 221 #endif
 222
 223 int __initdata user_defined_memmap = 0;
 224
 225 /*
 226  * "mem=nopentium" disables the 4MB page tables.
 227  * "mem=XXX[kKmM]" defines a memory region from HIGH_MEM
 228  * to <mem>, overriding the bios size.
 229  * "memmap=XXX[KkmM]@XXX[KkmM]" defines a memory region from
 230  * <start> to <start>+<mem>, overriding the bios size.
 231  *
 232  * HPA tells me bootloaders need to parse mem=, so no new
 233  * option should be mem=  [also see Documentation/i386/boot.txt]
 234  */
 235 static int __init parse_mem(char *arg)
 236 {
 237         if (!arg)
 238                 return -EINVAL;
 239
 240         if (strcmp(arg, "nopentium") == 0) {
 241                 clear_cpu_cap(&boot_cpu_data, X86_FEATURE_PSE);
 242                 disable_pse = 1;
 243         } else {
 244                 /* If the user specifies memory size, we
 245                  * limit the BIOS-provided memory map to
 246                  * that size. exactmap can be used to specify
 247                  * the exact map. mem=number can be used to
 248                  * trim the existing memory map.
 249                  */
 250                 unsigned long long mem_size;
 251
 252                 mem_size = memparse(arg, &arg);
 253                 limit_regions(mem_size);
 254                 user_defined_memmap = 1;
 255         }
 256         return 0;
 257 }
 258 early_param("mem", parse_mem);
 259
 260 #ifdef CONFIG_PROC_VMCORE
 261 /* elfcorehdr= specifies the location of elf core header
 262  * stored by the crashed kernel.
 263  */
 264 static int __init parse_elfcorehdr(char *arg)
 265 {
 266         if (!arg)
 267                 return -EINVAL;
 268
 269         elfcorehdr_addr = memparse(arg, &arg);
 270         return 0;
 271 }
 272 early_param("elfcorehdr", parse_elfcorehdr);
 273 #endif /* CONFIG_PROC_VMCORE */
 274
 275 /*
 276  * highmem=size forces highmem to be exactly 'size' bytes.
 277  * This works even on boxes that have no highmem otherwise.
 278  * This also works to reduce highmem size on bigger boxes.
 279  */
 280 static int __init parse_highmem(char *arg)
 281 {
 282         if (!arg)
 283                 return -EINVAL;
 284
 285         highmem_pages = memparse(arg, &arg) >> PAGE_SHIFT;
 286         return 0;
 287 }
 288 early_param("highmem", parse_highmem);
 289
 290 /*
 291  * vmalloc=size forces the vmalloc area to be exactly 'size'
 292  * bytes. This can be used to increase (or decrease) the
 293  * vmalloc area - the default is 128m.
 294  */
 295 static int __init parse_vmalloc(char *arg)
 296 {
 297         if (!arg)
 298                 return -EINVAL;
 299
 300         __VMALLOC_RESERVE = memparse(arg, &arg);
 301         return 0;
 302 }
 303 early_param("vmalloc", parse_vmalloc);
 304
 305 /*
 306  * reservetop=size reserves a hole at the top of the kernel address space which
 307  * a hypervisor can load into later.  Needed for dynamically loaded hypervisors,
 308  * so relocating the fixmap can be done before paging initialization.
 309  */
 310 static int __init parse_reservetop(char *arg)
 311 {
 312         unsigned long address;
 313
 314         if (!arg)
 315                 return -EINVAL;
 316
 317         address = memparse(arg, &arg);
 318         reserve_top_address(address);
 319         return 0;
 320 }
 321 early_param("reservetop", parse_reservetop);
 322
 323 /*
 324  * Determine low and high memory ranges:
 325  */
 326 unsigned long __init find_max_low_pfn(void)
 327 {
 328         unsigned long max_low_pfn;
 329
 330         max_low_pfn = max_pfn;
 331         if (max_low_pfn > MAXMEM_PFN) {
 332                 if (highmem_pages == -1)
 333                         highmem_pages = max_pfn - MAXMEM_PFN;
 334                 if (highmem_pages + MAXMEM_PFN < max_pfn)
 335                         max_pfn = MAXMEM_PFN + highmem_pages;
 336                 if (highmem_pages + MAXMEM_PFN > max_pfn) {
 337                         printk("only %luMB highmem pages available, ignoring highmem size of %uMB.\n", pages_to_mb(max_pfn - MAXMEM_PFN), pages_to_mb(highmem_pages));
 338                         highmem_pages = 0;
 339                 }
 340                 max_low_pfn = MAXMEM_PFN;
 341 #ifndef CONFIG_HIGHMEM
 342                 /* Maximum memory usable is what is directly addressable */
 343                 printk(KERN_WARNING "Warning only %ldMB will be used.\n",
 344                                         MAXMEM>>20);
 345                 if (max_pfn > MAX_NONPAE_PFN)
 346                         printk(KERN_WARNING "Use a HIGHMEM64G enabled kernel.\n");
 347                 else
 348                         printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
 349                 max_pfn = MAXMEM_PFN;
 350 #else /* !CONFIG_HIGHMEM */
 351 #ifndef CONFIG_HIGHMEM64G
 352                 if (max_pfn > MAX_NONPAE_PFN) {
 353                         max_pfn = MAX_NONPAE_PFN;
 354                         printk(KERN_WARNING "Warning only 4GB will be used.\n");
 355                         printk(KERN_WARNING "Use a HIGHMEM64G enabled kernel.\n");
 356                 }
 357 #endif /* !CONFIG_HIGHMEM64G */
 358 #endif /* !CONFIG_HIGHMEM */
 359         } else {
 360                 if (highmem_pages == -1)
 361                         highmem_pages = 0;
 362 #ifdef CONFIG_HIGHMEM
 363                 if (highmem_pages >= max_pfn) {
 364                         printk(KERN_ERR "highmem size specified (%uMB) is bigger than pages available (%luMB)!.\n", pages_to_mb(highmem_pages), pages_to_mb(max_pfn));
 365                         highmem_pages = 0;
 366                 }
 367                 if (highmem_pages) {
 368                         if (max_low_pfn-highmem_pages < 64*1024*1024/PAGE_SIZE){
 369                                 printk(KERN_ERR "highmem size %uMB results in smaller than 64MB lowmem, ignoring it.\n", pages_to_mb(highmem_pages));
 370                                 highmem_pages = 0;
 371                         }
 372                         max_low_pfn -= highmem_pages;
 373                 }
 374 #else
 375                 if (highmem_pages)
 376                         printk(KERN_ERR "ignoring highmem size on non-highmem kernel!\n");
 377 #endif
 378         }
 379         return max_low_pfn;
 380 }
 381
 382 /*
 383  * workaround for Dell systems that neglect to reserve EBDA
 384  */
 385 static void __init reserve_ebda_region(void)
 386 {
 387         unsigned int addr;
 388         addr = get_bios_ebda();
 389         if (addr)
 390                 reserve_bootmem(addr, PAGE_SIZE);
 391 }
 392
 393 #ifndef CONFIG_NEED_MULTIPLE_NODES
 394 void __init setup_bootmem_allocator(void);
 395 static unsigned long __init setup_memory(void)
 396 {
 397         /*
 398          * partially used pages are not usable - thus
 399          * we are rounding upwards:
 400          */
 401         min_low_pfn = PFN_UP(init_pg_tables_end);
 402
 403         find_max_pfn();
 404
 405         max_low_pfn = find_max_low_pfn();
 406
 407 #ifdef CONFIG_HIGHMEM
 408         highstart_pfn = highend_pfn = max_pfn;
 409         if (max_pfn > max_low_pfn) {
 410                 highstart_pfn = max_low_pfn;
 411         }
 412         printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
 413                 pages_to_mb(highend_pfn - highstart_pfn));
 414         num_physpages = highend_pfn;
 415         high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1;
 416 #else
 417         num_physpages = max_low_pfn;
 418         high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1;
 419 #endif
 420 #ifdef CONFIG_FLATMEM
 421         max_mapnr = num_physpages;
 422 #endif
 423         printk(KERN_NOTICE "%ldMB LOWMEM available.\n",
 424                         pages_to_mb(max_low_pfn));
 425
 426         setup_bootmem_allocator();
 427
 428         return max_low_pfn;
 429 }
 430
 431 void __init zone_sizes_init(void)
 432 {
 433         unsigned long max_zone_pfns[MAX_NR_ZONES];
 434         memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
 435         max_zone_pfns[ZONE_DMA] =
 436                 virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
 437         max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
 438 #ifdef CONFIG_HIGHMEM
 439         max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
 440         add_active_range(0, 0, highend_pfn);
 441 #else
 442         add_active_range(0, 0, max_low_pfn);
 443 #endif
 444
 445         free_area_init_nodes(max_zone_pfns);
 446 }
 447 #else
 448 extern unsigned long __init setup_memory(void);
 449 extern void zone_sizes_init(void);
 450 #endif /* !CONFIG_NEED_MULTIPLE_NODES */
 451
 452 static inline unsigned long long get_total_mem(void)
 453 {
 454         unsigned long long total;
 455
 456         total = max_low_pfn - min_low_pfn;
 457 #ifdef CONFIG_HIGHMEM
 458         total += highend_pfn - highstart_pfn;
 459 #endif
 460
 461         return total << PAGE_SHIFT;
 462 }
 463
 464 #ifdef CONFIG_KEXEC
 465 static void __init reserve_crashkernel(void)
 466 {
 467         unsigned long long total_mem;
 468         unsigned long long crash_size, crash_base;
 469         int ret;
 470
 471         total_mem = get_total_mem();
 472
 473         ret = parse_crashkernel(boot_command_line, total_mem,
 474                         &crash_size, &crash_base);
 475         if (ret == 0 && crash_size > 0) {
 476                 if (crash_base > 0) {
 477                         printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
 478                                         "for crashkernel (System RAM: %ldMB)\n",
 479                                         (unsigned long)(crash_size >> 20),
 480                                         (unsigned long)(crash_base >> 20),
 481                                         (unsigned long)(total_mem >> 20));
 482                         crashk_res.start = crash_base;
 483                         crashk_res.end   = crash_base + crash_size - 1;
 484                         reserve_bootmem(crash_base, crash_size);
 485                 } else
 486                         printk(KERN_INFO "crashkernel reservation failed - "
 487                                         "you have to specify a base address\n");
 488         }
 489 }
 490 #else
 491 static inline void __init reserve_crashkernel(void)
 492 {}
 493 #endif
 494
 495 void __init setup_bootmem_allocator(void)
 496 {
 497         unsigned long bootmap_size;
 498         /*
 499          * Initialize the boot-time allocator (with low memory only):
 500          */
 501         bootmap_size = init_bootmem(min_low_pfn, max_low_pfn);
 502
 503         register_bootmem_low_pages(max_low_pfn);
 504
 505         /*
 506          * Reserve the bootmem bitmap itself as well. We do this in two
 507          * steps (first step was init_bootmem()) because this catches
 508          * the (very unlikely) case of us accidentally initializing the
 509          * bootmem allocator with an invalid RAM area.
 510          */
 511         reserve_bootmem(__pa_symbol(_text), (PFN_PHYS(min_low_pfn) +
 512                          bootmap_size + PAGE_SIZE-1) - __pa_symbol(_text));
 513
 514         /*
 515          * reserve physical page 0 - it's a special BIOS page on many boxes,
 516          * enabling clean reboots, SMP operation, laptop functions.
 517          */
 518         reserve_bootmem(0, PAGE_SIZE);
 519
 520         /* reserve EBDA region, it's a 4K region */
 521         reserve_ebda_region();
 522
 523     /* could be an AMD 768MPX chipset. Reserve a page  before VGA to prevent
 524        PCI prefetch into it (errata #56). Usually the page is reserved anyways,
 525        unless you have no PS/2 mouse plugged in. */
 526         if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
 527             boot_cpu_data.x86 == 6)
 528              reserve_bootmem(0xa0000 - 4096, 4096);
 529
 530 #ifdef CONFIG_SMP
 531         /*
 532          * But first pinch a few for the stack/trampoline stuff
 533          * FIXME: Don't need the extra page at 4K, but need to fix
 534          * trampoline before removing it. (see the GDT stuff)
 535          */
 536         reserve_bootmem(PAGE_SIZE, PAGE_SIZE);
 537 #endif
 538 #ifdef CONFIG_ACPI_SLEEP
 539         /*
 540          * Reserve low memory region for sleep support.
 541          */
 542         acpi_reserve_bootmem();
 543 #endif
 544 #ifdef CONFIG_X86_FIND_SMP_CONFIG
 545         /*
 546          * Find and reserve possible boot-time SMP configuration:
 547          */
 548         find_smp_config();
 549 #endif
 550         numa_kva_reserve();
 551 #ifdef CONFIG_BLK_DEV_INITRD
 552         if (boot_params.hdr.type_of_loader && boot_params.hdr.ramdisk_image) {
 553                 unsigned long ramdisk_image = boot_params.hdr.ramdisk_image;
 554                 unsigned long ramdisk_size  = boot_params.hdr.ramdisk_size;
 555                 unsigned long ramdisk_end   = ramdisk_image + ramdisk_size;
 556                 unsigned long end_of_lowmem = max_low_pfn << PAGE_SHIFT;
 557
 558                 if (ramdisk_end <= end_of_lowmem) {
 559                         reserve_bootmem(ramdisk_image, ramdisk_size);
 560                         initrd_start = ramdisk_image + PAGE_OFFSET;
 561                         initrd_end = initrd_start+ramdisk_size;
 562                 } else {
 563                         printk(KERN_ERR "initrd extends beyond end of memory "
 564                                "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 565                                ramdisk_end, end_of_lowmem);
 566                         initrd_start = 0;
 567                 }
 568         }
 569 #endif
 570         reserve_crashkernel();
 571 }
 572
 573 /*
 574  * The node 0 pgdat is initialized before all of these because
 575  * it's needed for bootmem.  node>0 pgdats have their virtual
 576  * space allocated before the pagetables are in place to access
 577  * them, so they can't be cleared then.
 578  *
 579  * This should all compile down to nothing when NUMA is off.
 580  */
 581 static void __init remapped_pgdat_init(void)
 582 {
 583         int nid;
 584
 585         for_each_online_node(nid) {
 586                 if (nid != 0)
 587                         memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
 588         }
 589 }
 590
 591 #ifdef CONFIG_MCA
 592 static void set_mca_bus(int x)
 593 {
 594         MCA_bus = x;
 595 }
 596 #else
 597 static void set_mca_bus(int x) { }
 598 #endif
 599
 600 /* Overridden in paravirt.c if CONFIG_PARAVIRT */
 601 char * __init __attribute__((weak)) memory_setup(void)
 602 {
 603         return machine_specific_memory_setup();
 604 }
 605
 606 /*
 607  * Determine if we were loaded by an EFI loader.  If so, then we have also been
 608  * passed the efi memmap, systab, etc., so we should use these data structures
 609  * for initialization.  Note, the efi init code path is determined by the
 610  * global efi_enabled. This allows the same kernel image to be used on existing
 611  * systems (with a traditional BIOS) as well as on EFI systems.
 612  */
 613 void __init setup_arch(char **cmdline_p)
 614 {
 615         unsigned long max_low_pfn;
 616
 617         memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
 618         pre_setup_arch_hook();
 619         early_cpu_init();
 620
 621         /*
 622          * FIXME: This isn't an official loader_type right
 623          * now but does currently work with elilo.
 624          * If we were configured as an EFI kernel, check to make
 625          * sure that we were loaded correctly from elilo and that
 626          * the system table is valid.  If not, then initialize normally.
 627          */
 628 #ifdef CONFIG_EFI
 629         if ((boot_params.hdr.type_of_loader == 0x50) &&
 630             boot_params.efi_info.efi_systab)
 631                 efi_enabled = 1;
 632 #endif
 633
 634         ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
 635         screen_info = boot_params.screen_info;
 636         edid_info = boot_params.edid_info;
 637         apm_info.bios = boot_params.apm_bios_info;
 638         ist_info = boot_params.ist_info;
 639         saved_videomode = boot_params.hdr.vid_mode;
 640         if( boot_params.sys_desc_table.length != 0 ) {
 641                 set_mca_bus(boot_params.sys_desc_table.table[3] & 0x2);
 642                 machine_id = boot_params.sys_desc_table.table[0];
 643                 machine_submodel_id = boot_params.sys_desc_table.table[1];
 644                 BIOS_revision = boot_params.sys_desc_table.table[2];
 645         }
 646         bootloader_type = boot_params.hdr.type_of_loader;
 647
 648 #ifdef CONFIG_BLK_DEV_RAM
 649         rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
 650         rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
 651         rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
 652 #endif
 653         ARCH_SETUP
 654         if (efi_enabled)
 655                 efi_init();
 656         else {
 657                 printk(KERN_INFO "BIOS-provided physical RAM map:\n");
 658                 print_memory_map(memory_setup());
 659         }
 660
 661         copy_edd();
 662
 663         if (!boot_params.hdr.root_flags)
 664                 root_mountflags &= ~MS_RDONLY;
 665         init_mm.start_code = (unsigned long) _text;
 666         init_mm.end_code = (unsigned long) _etext;
 667         init_mm.end_data = (unsigned long) _edata;
 668         init_mm.brk = init_pg_tables_end + PAGE_OFFSET;
 669
 670         code_resource.start = virt_to_phys(_text);
 671         code_resource.end = virt_to_phys(_etext)-1;
 672         data_resource.start = virt_to_phys(_etext);
 673         data_resource.end = virt_to_phys(_edata)-1;
 674         bss_resource.start = virt_to_phys(&__bss_start);
 675         bss_resource.end = virt_to_phys(&__bss_stop)-1;
 676
 677         parse_early_param();
 678
 679         if (user_defined_memmap) {
 680                 printk(KERN_INFO "user-defined physical RAM map:\n");
 681                 print_memory_map("user");
 682         }
 683
 684         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 685         *cmdline_p = command_line;
 686
 687         max_low_pfn = setup_memory();
 688
 689 #ifdef CONFIG_VMI
 690         /*
 691          * Must be after max_low_pfn is determined, and before kernel
 692          * pagetables are setup.
 693          */
 694         vmi_init();
 695 #endif
 696
 697         /*
 698          * NOTE: before this point _nobody_ is allowed to allocate
 699          * any memory using the bootmem allocator.  Although the
 700          * allocator is now initialised only the first 8Mb of the kernel
 701          * virtual address space has been mapped.  All allocations before
 702          * paging_init() has completed must use the alloc_bootmem_low_pages()
 703          * variant (which allocates DMA'able memory) and care must be taken
 704          * not to exceed the 8Mb limit.
 705          */
 706
 707 #ifdef CONFIG_SMP
 708         smp_alloc_memory(); /* AP processor realmode stacks in low memory*/
 709 #endif
 710         paging_init();
 711         remapped_pgdat_init();
 712         sparse_init();
 713         zone_sizes_init();
 714
 715         /*
 716          * NOTE: at this point the bootmem allocator is fully available.
 717          */
 718
 719         paravirt_post_allocator_init();
 720
 721         dmi_scan_machine();
 722
 723         io_delay_init();;
 724
 725 #ifdef CONFIG_X86_GENERICARCH
 726         generic_apic_probe();
 727 #endif
 728         if (efi_enabled)
 729                 efi_map_memmap();
 730
 731 #ifdef CONFIG_ACPI
 732         /*
 733          * Parse the ACPI tables for possible boot-time SMP configuration.
 734          */
 735         acpi_boot_table_init();
 736 #endif
 737
 738         early_quirks();
 739
 740 #ifdef CONFIG_ACPI
 741         acpi_boot_init();
 742
 743 #if defined(CONFIG_SMP) && defined(CONFIG_X86_PC)
 744         if (def_to_bigsmp)
 745                 printk(KERN_WARNING "More than 8 CPUs detected and "
 746                         "CONFIG_X86_PC cannot handle it.\nUse "
 747                         "CONFIG_X86_GENERICARCH or CONFIG_X86_BIGSMP.\n");
 748 #endif
 749 #endif
 750 #ifdef CONFIG_X86_LOCAL_APIC
 751         if (smp_found_config)
 752                 get_smp_config();
 753 #endif
 754
 755         e820_register_memory();
 756         e820_mark_nosave_regions();
 757
 758 #ifdef CONFIG_VT
 759 #if defined(CONFIG_VGA_CONSOLE)
 760         if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
 761                 conswitchp = &vga_con;
 762 #elif defined(CONFIG_DUMMY_CONSOLE)
 763         conswitchp = &dummy_con;
 764 #endif
 765 #endif
 766 }
 767
 768 /*
 769  * Request address space for all standard resources
 770  *
 771  * This is called just before pcibios_init(), which is also a
 772  * subsys_initcall, but is linked in later (in arch/i386/pci/common.c).
 773  */
 774 static int __init request_standard_resources(void)
 775 {
 776         int i;
 777
 778         printk(KERN_INFO "Setting up standard PCI resources\n");
 779         if (efi_enabled)
 780                 efi_initialize_iomem_resources(&code_resource,
 781                                 &data_resource, &bss_resource);
 782         else
 783                 legacy_init_iomem_resources(&code_resource,
 784                                 &data_resource, &bss_resource);
 785
 786         /* EFI systems may still have VGA */
 787         request_resource(&iomem_resource, &video_ram_resource);
 788
 789         /* request I/O space for devices used on all i[345]86 PCs */
 790         for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
 791                 request_resource(&ioport_resource, &standard_io_resources[i]);
 792         return 0;
 793 }
 794
 795 subsys_initcall(request_standard_resources);