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 #ifndef CONFIG_DEBUG_BOOT_PARAMS
 198 struct boot_params __initdata boot_params;
 199 #else
 200 struct boot_params boot_params;
 201 #endif
 202
 203 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
 204 struct edd edd;
 205 #ifdef CONFIG_EDD_MODULE
 206 EXPORT_SYMBOL(edd);
 207 #endif
 208 /**
 209  * copy_edd() - Copy the BIOS EDD information
 210  *              from boot_params into a safe place.
 211  *
 212  */
 213 static inline void copy_edd(void)
 214 {
 215      memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
 216             sizeof(edd.mbr_signature));
 217      memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
 218      edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
 219      edd.edd_info_nr = boot_params.eddbuf_entries;
 220 }
 221 #else
 222 static inline void copy_edd(void)
 223 {
 224 }
 225 #endif
 226
 227 int __initdata user_defined_memmap = 0;
 228
 229 /*
 230  * "mem=nopentium" disables the 4MB page tables.
 231  * "mem=XXX[kKmM]" defines a memory region from HIGH_MEM
 232  * to <mem>, overriding the bios size.
 233  * "memmap=XXX[KkmM]@XXX[KkmM]" defines a memory region from
 234  * <start> to <start>+<mem>, overriding the bios size.
 235  *
 236  * HPA tells me bootloaders need to parse mem=, so no new
 237  * option should be mem=  [also see Documentation/i386/boot.txt]
 238  */
 239 static int __init parse_mem(char *arg)
 240 {
 241         if (!arg)
 242                 return -EINVAL;
 243
 244         if (strcmp(arg, "nopentium") == 0) {
 245                 clear_cpu_cap(&boot_cpu_data, X86_FEATURE_PSE);
 246                 disable_pse = 1;
 247         } else {
 248                 /* If the user specifies memory size, we
 249                  * limit the BIOS-provided memory map to
 250                  * that size. exactmap can be used to specify
 251                  * the exact map. mem=number can be used to
 252                  * trim the existing memory map.
 253                  */
 254                 unsigned long long mem_size;
 255
 256                 mem_size = memparse(arg, &arg);
 257                 limit_regions(mem_size);
 258                 user_defined_memmap = 1;
 259         }
 260         return 0;
 261 }
 262 early_param("mem", parse_mem);
 263
 264 #ifdef CONFIG_PROC_VMCORE
 265 /* elfcorehdr= specifies the location of elf core header
 266  * stored by the crashed kernel.
 267  */
 268 static int __init parse_elfcorehdr(char *arg)
 269 {
 270         if (!arg)
 271                 return -EINVAL;
 272
 273         elfcorehdr_addr = memparse(arg, &arg);
 274         return 0;
 275 }
 276 early_param("elfcorehdr", parse_elfcorehdr);
 277 #endif /* CONFIG_PROC_VMCORE */
 278
 279 /*
 280  * highmem=size forces highmem to be exactly 'size' bytes.
 281  * This works even on boxes that have no highmem otherwise.
 282  * This also works to reduce highmem size on bigger boxes.
 283  */
 284 static int __init parse_highmem(char *arg)
 285 {
 286         if (!arg)
 287                 return -EINVAL;
 288
 289         highmem_pages = memparse(arg, &arg) >> PAGE_SHIFT;
 290         return 0;
 291 }
 292 early_param("highmem", parse_highmem);
 293
 294 /*
 295  * vmalloc=size forces the vmalloc area to be exactly 'size'
 296  * bytes. This can be used to increase (or decrease) the
 297  * vmalloc area - the default is 128m.
 298  */
 299 static int __init parse_vmalloc(char *arg)
 300 {
 301         if (!arg)
 302                 return -EINVAL;
 303
 304         __VMALLOC_RESERVE = memparse(arg, &arg);
 305         return 0;
 306 }
 307 early_param("vmalloc", parse_vmalloc);
 308
 309 /*
 310  * reservetop=size reserves a hole at the top of the kernel address space which
 311  * a hypervisor can load into later.  Needed for dynamically loaded hypervisors,
 312  * so relocating the fixmap can be done before paging initialization.
 313  */
 314 static int __init parse_reservetop(char *arg)
 315 {
 316         unsigned long address;
 317
 318         if (!arg)
 319                 return -EINVAL;
 320
 321         address = memparse(arg, &arg);
 322         reserve_top_address(address);
 323         return 0;
 324 }
 325 early_param("reservetop", parse_reservetop);
 326
 327 /*
 328  * Determine low and high memory ranges:
 329  */
 330 unsigned long __init find_max_low_pfn(void)
 331 {
 332         unsigned long max_low_pfn;
 333
 334         max_low_pfn = max_pfn;
 335         if (max_low_pfn > MAXMEM_PFN) {
 336                 if (highmem_pages == -1)
 337                         highmem_pages = max_pfn - MAXMEM_PFN;
 338                 if (highmem_pages + MAXMEM_PFN < max_pfn)
 339                         max_pfn = MAXMEM_PFN + highmem_pages;
 340                 if (highmem_pages + MAXMEM_PFN > max_pfn) {
 341                         printk("only %luMB highmem pages available, ignoring highmem size of %uMB.\n", pages_to_mb(max_pfn - MAXMEM_PFN), pages_to_mb(highmem_pages));
 342                         highmem_pages = 0;
 343                 }
 344                 max_low_pfn = MAXMEM_PFN;
 345 #ifndef CONFIG_HIGHMEM
 346                 /* Maximum memory usable is what is directly addressable */
 347                 printk(KERN_WARNING "Warning only %ldMB will be used.\n",
 348                                         MAXMEM>>20);
 349                 if (max_pfn > MAX_NONPAE_PFN)
 350                         printk(KERN_WARNING "Use a HIGHMEM64G enabled kernel.\n");
 351                 else
 352                         printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
 353                 max_pfn = MAXMEM_PFN;
 354 #else /* !CONFIG_HIGHMEM */
 355 #ifndef CONFIG_HIGHMEM64G
 356                 if (max_pfn > MAX_NONPAE_PFN) {
 357                         max_pfn = MAX_NONPAE_PFN;
 358                         printk(KERN_WARNING "Warning only 4GB will be used.\n");
 359                         printk(KERN_WARNING "Use a HIGHMEM64G enabled kernel.\n");
 360                 }
 361 #endif /* !CONFIG_HIGHMEM64G */
 362 #endif /* !CONFIG_HIGHMEM */
 363         } else {
 364                 if (highmem_pages == -1)
 365                         highmem_pages = 0;
 366 #ifdef CONFIG_HIGHMEM
 367                 if (highmem_pages >= max_pfn) {
 368                         printk(KERN_ERR "highmem size specified (%uMB) is bigger than pages available (%luMB)!.\n", pages_to_mb(highmem_pages), pages_to_mb(max_pfn));
 369                         highmem_pages = 0;
 370                 }
 371                 if (highmem_pages) {
 372                         if (max_low_pfn-highmem_pages < 64*1024*1024/PAGE_SIZE){
 373                                 printk(KERN_ERR "highmem size %uMB results in smaller than 64MB lowmem, ignoring it.\n", pages_to_mb(highmem_pages));
 374                                 highmem_pages = 0;
 375                         }
 376                         max_low_pfn -= highmem_pages;
 377                 }
 378 #else
 379                 if (highmem_pages)
 380                         printk(KERN_ERR "ignoring highmem size on non-highmem kernel!\n");
 381 #endif
 382         }
 383         return max_low_pfn;
 384 }
 385
 386 /*
 387  * workaround for Dell systems that neglect to reserve EBDA
 388  */
 389 static void __init reserve_ebda_region(void)
 390 {
 391         unsigned int addr;
 392         addr = get_bios_ebda();
 393         if (addr)
 394                 reserve_bootmem(addr, PAGE_SIZE);
 395 }
 396
 397 #ifndef CONFIG_NEED_MULTIPLE_NODES
 398 void __init setup_bootmem_allocator(void);
 399 static unsigned long __init setup_memory(void)
 400 {
 401         /*
 402          * partially used pages are not usable - thus
 403          * we are rounding upwards:
 404          */
 405         min_low_pfn = PFN_UP(init_pg_tables_end);
 406
 407         find_max_pfn();
 408
 409         max_low_pfn = find_max_low_pfn();
 410
 411 #ifdef CONFIG_HIGHMEM
 412         highstart_pfn = highend_pfn = max_pfn;
 413         if (max_pfn > max_low_pfn) {
 414                 highstart_pfn = max_low_pfn;
 415         }
 416         printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
 417                 pages_to_mb(highend_pfn - highstart_pfn));
 418         num_physpages = highend_pfn;
 419         high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1;
 420 #else
 421         num_physpages = max_low_pfn;
 422         high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1;
 423 #endif
 424 #ifdef CONFIG_FLATMEM
 425         max_mapnr = num_physpages;
 426 #endif
 427         printk(KERN_NOTICE "%ldMB LOWMEM available.\n",
 428                         pages_to_mb(max_low_pfn));
 429
 430         setup_bootmem_allocator();
 431
 432         return max_low_pfn;
 433 }
 434
 435 void __init zone_sizes_init(void)
 436 {
 437         unsigned long max_zone_pfns[MAX_NR_ZONES];
 438         memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
 439         max_zone_pfns[ZONE_DMA] =
 440                 virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
 441         max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
 442 #ifdef CONFIG_HIGHMEM
 443         max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
 444         add_active_range(0, 0, highend_pfn);
 445 #else
 446         add_active_range(0, 0, max_low_pfn);
 447 #endif
 448
 449         free_area_init_nodes(max_zone_pfns);
 450 }
 451 #else
 452 extern unsigned long __init setup_memory(void);
 453 extern void zone_sizes_init(void);
 454 #endif /* !CONFIG_NEED_MULTIPLE_NODES */
 455
 456 static inline unsigned long long get_total_mem(void)
 457 {
 458         unsigned long long total;
 459
 460         total = max_low_pfn - min_low_pfn;
 461 #ifdef CONFIG_HIGHMEM
 462         total += highend_pfn - highstart_pfn;
 463 #endif
 464
 465         return total << PAGE_SHIFT;
 466 }
 467
 468 #ifdef CONFIG_KEXEC
 469 static void __init reserve_crashkernel(void)
 470 {
 471         unsigned long long total_mem;
 472         unsigned long long crash_size, crash_base;
 473         int ret;
 474
 475         total_mem = get_total_mem();
 476
 477         ret = parse_crashkernel(boot_command_line, total_mem,
 478                         &crash_size, &crash_base);
 479         if (ret == 0 && crash_size > 0) {
 480                 if (crash_base > 0) {
 481                         printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
 482                                         "for crashkernel (System RAM: %ldMB)\n",
 483                                         (unsigned long)(crash_size >> 20),
 484                                         (unsigned long)(crash_base >> 20),
 485                                         (unsigned long)(total_mem >> 20));
 486                         crashk_res.start = crash_base;
 487                         crashk_res.end   = crash_base + crash_size - 1;
 488                         reserve_bootmem(crash_base, crash_size);
 489                 } else
 490                         printk(KERN_INFO "crashkernel reservation failed - "
 491                                         "you have to specify a base address\n");
 492         }
 493 }
 494 #else
 495 static inline void __init reserve_crashkernel(void)
 496 {}
 497 #endif
 498
 499 #ifdef CONFIG_BLK_DEV_INITRD
 500
 501 static bool do_relocate_initrd = false;
 502
 503 static void __init reserve_initrd(void)
 504 {
 505         unsigned long ramdisk_image = boot_params.hdr.ramdisk_image;
 506         unsigned long ramdisk_size  = boot_params.hdr.ramdisk_size;
 507         unsigned long ramdisk_end   = ramdisk_image + ramdisk_size;
 508         unsigned long end_of_lowmem = max_low_pfn << PAGE_SHIFT;
 509         unsigned long ramdisk_here;
 510
 511         initrd_start = 0;
 512
 513         if (!boot_params.hdr.type_of_loader ||
 514             !ramdisk_image || !ramdisk_size)
 515                 return;         /* No initrd provided by bootloader */
 516
 517         if (ramdisk_end < ramdisk_image) {
 518                 printk(KERN_ERR "initrd wraps around end of memory, "
 519                        "disabling initrd\n");
 520                 return;
 521         }
 522         if (ramdisk_size >= end_of_lowmem/2) {
 523                 printk(KERN_ERR "initrd too large to handle, "
 524                        "disabling initrd\n");
 525                 return;
 526         }
 527         if (ramdisk_end <= end_of_lowmem) {
 528                 /* All in lowmem, easy case */
 529                 reserve_bootmem(ramdisk_image, ramdisk_size);
 530                 initrd_start = ramdisk_image + PAGE_OFFSET;
 531                 initrd_end = initrd_start+ramdisk_size;
 532                 return;
 533         }
 534
 535         /* We need to move the initrd down into lowmem */
 536         ramdisk_here = (end_of_lowmem - ramdisk_size) & PAGE_MASK;
 537
 538         /* Note: this includes all the lowmem currently occupied by
 539            the initrd, we rely on that fact to keep the data intact. */
 540         reserve_bootmem(ramdisk_here, ramdisk_size);
 541         initrd_start = ramdisk_here + PAGE_OFFSET;
 542         initrd_end   = initrd_start + ramdisk_size;
 543
 544         do_relocate_initrd = true;
 545 }
 546
 547 #define MAX_MAP_CHUNK   (NR_FIX_BTMAPS << PAGE_SHIFT)
 548
 549 static void __init relocate_initrd(void)
 550 {
 551         unsigned long ramdisk_image = boot_params.hdr.ramdisk_image;
 552         unsigned long ramdisk_size  = boot_params.hdr.ramdisk_size;
 553         unsigned long end_of_lowmem = max_low_pfn << PAGE_SHIFT;
 554         unsigned long ramdisk_here;
 555         unsigned long slop, clen, mapaddr;
 556         char *p, *q;
 557
 558         if (!do_relocate_initrd)
 559                 return;
 560
 561         ramdisk_here = initrd_start - PAGE_OFFSET;
 562
 563         q = (char *)initrd_start;
 564
 565         /* Copy any lowmem portion of the initrd */
 566         if (ramdisk_image < end_of_lowmem) {
 567                 clen = end_of_lowmem - ramdisk_image;
 568                 p = (char *)__va(ramdisk_image);
 569                 memcpy(q, p, clen);
 570                 q += clen;
 571                 ramdisk_image += clen;
 572                 ramdisk_size  -= clen;
 573         }
 574
 575         /* Copy the highmem portion of the initrd */
 576         while (ramdisk_size) {
 577                 slop = ramdisk_image & ~PAGE_MASK;
 578                 clen = ramdisk_size;
 579                 if (clen > MAX_MAP_CHUNK-slop)
 580                         clen = MAX_MAP_CHUNK-slop;
 581                 mapaddr = ramdisk_image & PAGE_MASK;
 582                 p = bt_ioremap(mapaddr, clen+slop);
 583                 memcpy(q, p+slop, clen);
 584                 bt_iounmap(p, clen+slop);
 585                 q += clen;
 586                 ramdisk_image += clen;
 587                 ramdisk_size  -= clen;
 588         }
 589 }
 590
 591 #endif /* CONFIG_BLK_DEV_INITRD */
 592
 593 void __init setup_bootmem_allocator(void)
 594 {
 595         unsigned long bootmap_size;
 596         /*
 597          * Initialize the boot-time allocator (with low memory only):
 598          */
 599         bootmap_size = init_bootmem(min_low_pfn, max_low_pfn);
 600
 601         register_bootmem_low_pages(max_low_pfn);
 602
 603         /*
 604          * Reserve the bootmem bitmap itself as well. We do this in two
 605          * steps (first step was init_bootmem()) because this catches
 606          * the (very unlikely) case of us accidentally initializing the
 607          * bootmem allocator with an invalid RAM area.
 608          */
 609         reserve_bootmem(__pa_symbol(_text), (PFN_PHYS(min_low_pfn) +
 610                          bootmap_size + PAGE_SIZE-1) - __pa_symbol(_text));
 611
 612         /*
 613          * reserve physical page 0 - it's a special BIOS page on many boxes,
 614          * enabling clean reboots, SMP operation, laptop functions.
 615          */
 616         reserve_bootmem(0, PAGE_SIZE);
 617
 618         /* reserve EBDA region, it's a 4K region */
 619         reserve_ebda_region();
 620
 621     /* could be an AMD 768MPX chipset. Reserve a page  before VGA to prevent
 622        PCI prefetch into it (errata #56). Usually the page is reserved anyways,
 623        unless you have no PS/2 mouse plugged in. */
 624         if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
 625             boot_cpu_data.x86 == 6)
 626              reserve_bootmem(0xa0000 - 4096, 4096);
 627
 628 #ifdef CONFIG_SMP
 629         /*
 630          * But first pinch a few for the stack/trampoline stuff
 631          * FIXME: Don't need the extra page at 4K, but need to fix
 632          * trampoline before removing it. (see the GDT stuff)
 633          */
 634         reserve_bootmem(PAGE_SIZE, PAGE_SIZE);
 635 #endif
 636 #ifdef CONFIG_ACPI_SLEEP
 637         /*
 638          * Reserve low memory region for sleep support.
 639          */
 640         acpi_reserve_bootmem();
 641 #endif
 642 #ifdef CONFIG_X86_FIND_SMP_CONFIG
 643         /*
 644          * Find and reserve possible boot-time SMP configuration:
 645          */
 646         find_smp_config();
 647 #endif
 648 #ifdef CONFIG_BLK_DEV_INITRD
 649         reserve_initrd();
 650 #endif
 651         numa_kva_reserve();
 652         reserve_crashkernel();
 653 }
 654
 655 /*
 656  * The node 0 pgdat is initialized before all of these because
 657  * it's needed for bootmem.  node>0 pgdats have their virtual
 658  * space allocated before the pagetables are in place to access
 659  * them, so they can't be cleared then.
 660  *
 661  * This should all compile down to nothing when NUMA is off.
 662  */
 663 static void __init remapped_pgdat_init(void)
 664 {
 665         int nid;
 666
 667         for_each_online_node(nid) {
 668                 if (nid != 0)
 669                         memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
 670         }
 671 }
 672
 673 #ifdef CONFIG_MCA
 674 static void set_mca_bus(int x)
 675 {
 676         MCA_bus = x;
 677 }
 678 #else
 679 static void set_mca_bus(int x) { }
 680 #endif
 681
 682 /* Overridden in paravirt.c if CONFIG_PARAVIRT */
 683 char * __init __attribute__((weak)) memory_setup(void)
 684 {
 685         return machine_specific_memory_setup();
 686 }
 687
 688 /*
 689  * Determine if we were loaded by an EFI loader.  If so, then we have also been
 690  * passed the efi memmap, systab, etc., so we should use these data structures
 691  * for initialization.  Note, the efi init code path is determined by the
 692  * global efi_enabled. This allows the same kernel image to be used on existing
 693  * systems (with a traditional BIOS) as well as on EFI systems.
 694  */
 695 void __init setup_arch(char **cmdline_p)
 696 {
 697         unsigned long max_low_pfn;
 698
 699         memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
 700         pre_setup_arch_hook();
 701         early_cpu_init();
 702
 703 #ifdef CONFIG_EFI
 704         if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
 705                      "EL32", 4))
 706                 efi_enabled = 1;
 707 #endif
 708
 709         ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
 710         screen_info = boot_params.screen_info;
 711         edid_info = boot_params.edid_info;
 712         apm_info.bios = boot_params.apm_bios_info;
 713         ist_info = boot_params.ist_info;
 714         saved_videomode = boot_params.hdr.vid_mode;
 715         if( boot_params.sys_desc_table.length != 0 ) {
 716                 set_mca_bus(boot_params.sys_desc_table.table[3] & 0x2);
 717                 machine_id = boot_params.sys_desc_table.table[0];
 718                 machine_submodel_id = boot_params.sys_desc_table.table[1];
 719                 BIOS_revision = boot_params.sys_desc_table.table[2];
 720         }
 721         bootloader_type = boot_params.hdr.type_of_loader;
 722
 723 #ifdef CONFIG_BLK_DEV_RAM
 724         rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
 725         rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
 726         rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
 727 #endif
 728         ARCH_SETUP
 729
 730         printk(KERN_INFO "BIOS-provided physical RAM map:\n");
 731         print_memory_map(memory_setup());
 732
 733         copy_edd();
 734
 735         if (!boot_params.hdr.root_flags)
 736                 root_mountflags &= ~MS_RDONLY;
 737         init_mm.start_code = (unsigned long) _text;
 738         init_mm.end_code = (unsigned long) _etext;
 739         init_mm.end_data = (unsigned long) _edata;
 740         init_mm.brk = init_pg_tables_end + PAGE_OFFSET;
 741
 742         code_resource.start = virt_to_phys(_text);
 743         code_resource.end = virt_to_phys(_etext)-1;
 744         data_resource.start = virt_to_phys(_etext);
 745         data_resource.end = virt_to_phys(_edata)-1;
 746         bss_resource.start = virt_to_phys(&__bss_start);
 747         bss_resource.end = virt_to_phys(&__bss_stop)-1;
 748
 749         parse_early_param();
 750
 751         if (user_defined_memmap) {
 752                 printk(KERN_INFO "user-defined physical RAM map:\n");
 753                 print_memory_map("user");
 754         }
 755
 756         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 757         *cmdline_p = command_line;
 758
 759         if (efi_enabled)
 760                 efi_init();
 761
 762         max_low_pfn = setup_memory();
 763
 764 #ifdef CONFIG_VMI
 765         /*
 766          * Must be after max_low_pfn is determined, and before kernel
 767          * pagetables are setup.
 768          */
 769         vmi_init();
 770 #endif
 771
 772         /*
 773          * NOTE: before this point _nobody_ is allowed to allocate
 774          * any memory using the bootmem allocator.  Although the
 775          * allocator is now initialised only the first 8Mb of the kernel
 776          * virtual address space has been mapped.  All allocations before
 777          * paging_init() has completed must use the alloc_bootmem_low_pages()
 778          * variant (which allocates DMA'able memory) and care must be taken
 779          * not to exceed the 8Mb limit.
 780          */
 781
 782 #ifdef CONFIG_SMP
 783         smp_alloc_memory(); /* AP processor realmode stacks in low memory*/
 784 #endif
 785         paging_init();
 786         remapped_pgdat_init();
 787         sparse_init();
 788         zone_sizes_init();
 789
 790         /*
 791          * NOTE: at this point the bootmem allocator is fully available.
 792          */
 793
 794 #ifdef CONFIG_BLK_DEV_INITRD
 795         relocate_initrd();
 796 #endif
 797
 798         paravirt_post_allocator_init();
 799
 800         dmi_scan_machine();
 801
 802         io_delay_init();
 803
 804 #ifdef CONFIG_X86_GENERICARCH
 805         generic_apic_probe();
 806 #endif
 807         if (efi_enabled)
 808                 efi_map_memmap();
 809
 810 #ifdef CONFIG_ACPI
 811         /*
 812          * Parse the ACPI tables for possible boot-time SMP configuration.
 813          */
 814         acpi_boot_table_init();
 815 #endif
 816
 817         early_quirks();
 818
 819 #ifdef CONFIG_ACPI
 820         acpi_boot_init();
 821
 822 #if defined(CONFIG_SMP) && defined(CONFIG_X86_PC)
 823         if (def_to_bigsmp)
 824                 printk(KERN_WARNING "More than 8 CPUs detected and "
 825                         "CONFIG_X86_PC cannot handle it.\nUse "
 826                         "CONFIG_X86_GENERICARCH or CONFIG_X86_BIGSMP.\n");
 827 #endif
 828 #endif
 829 #ifdef CONFIG_X86_LOCAL_APIC
 830         if (smp_found_config)
 831                 get_smp_config();
 832 #endif
 833
 834         e820_register_memory();
 835         e820_mark_nosave_regions();
 836
 837 #ifdef CONFIG_VT
 838 #if defined(CONFIG_VGA_CONSOLE)
 839         if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
 840                 conswitchp = &vga_con;
 841 #elif defined(CONFIG_DUMMY_CONSOLE)
 842         conswitchp = &dummy_con;
 843 #endif
 844 #endif
 845 }
 846
 847 /*
 848  * Request address space for all standard resources
 849  *
 850  * This is called just before pcibios_init(), which is also a
 851  * subsys_initcall, but is linked in later (in arch/i386/pci/common.c).
 852  */
 853 static int __init request_standard_resources(void)
 854 {
 855         int i;
 856
 857         printk(KERN_INFO "Setting up standard PCI resources\n");
 858         init_iomem_resources(&code_resource, &data_resource, &bss_resource);
 859
 860         request_resource(&iomem_resource, &video_ram_resource);
 861
 862         /* request I/O space for devices used on all i[345]86 PCs */
 863         for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
 864                 request_resource(&ioport_resource, &standard_io_resources[i]);
 865         return 0;
 866 }
 867
 868 subsys_initcall(request_standard_resources);