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 /*
  72  * Machine setup..
  73  */
  74 static struct resource data_resource = {
  75         .name   = "Kernel data",
  76         .start  = 0,
  77         .end    = 0,
  78         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
  79 };
  80
  81 static struct resource code_resource = {
  82         .name   = "Kernel code",
  83         .start  = 0,
  84         .end    = 0,
  85         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
  86 };
  87
  88 static struct resource bss_resource = {
  89         .name   = "Kernel bss",
  90         .start  = 0,
  91         .end    = 0,
  92         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
  93 };
  94
  95 static struct resource video_ram_resource = {
  96         .name   = "Video RAM area",
  97         .start  = 0xa0000,
  98         .end    = 0xbffff,
  99         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 100 };
 101
 102 static struct resource standard_io_resources[] = { {
 103         .name   = "dma1",
 104         .start  = 0x0000,
 105         .end    = 0x001f,
 106         .flags  = IORESOURCE_BUSY | IORESOURCE_IO
 107 }, {
 108         .name   = "pic1",
 109         .start  = 0x0020,
 110         .end    = 0x0021,
 111         .flags  = IORESOURCE_BUSY | IORESOURCE_IO
 112 }, {
 113         .name   = "timer0",
 114         .start  = 0x0040,
 115         .end    = 0x0043,
 116         .flags  = IORESOURCE_BUSY | IORESOURCE_IO
 117 }, {
 118         .name   = "timer1",
 119         .start  = 0x0050,
 120         .end    = 0x0053,
 121         .flags  = IORESOURCE_BUSY | IORESOURCE_IO
 122 }, {
 123         .name   = "keyboard",
 124         .start  = 0x0060,
 125         .end    = 0x006f,
 126         .flags  = IORESOURCE_BUSY | IORESOURCE_IO
 127 }, {
 128         .name   = "dma page reg",
 129         .start  = 0x0080,
 130         .end    = 0x008f,
 131         .flags  = IORESOURCE_BUSY | IORESOURCE_IO
 132 }, {
 133         .name   = "pic2",
 134         .start  = 0x00a0,
 135         .end    = 0x00a1,
 136         .flags  = IORESOURCE_BUSY | IORESOURCE_IO
 137 }, {
 138         .name   = "dma2",
 139         .start  = 0x00c0,
 140         .end    = 0x00df,
 141         .flags  = IORESOURCE_BUSY | IORESOURCE_IO
 142 }, {
 143         .name   = "fpu",
 144         .start  = 0x00f0,
 145         .end    = 0x00ff,
 146         .flags  = IORESOURCE_BUSY | IORESOURCE_IO
 147 } };
 148
 149 /* cpu data as detected by the assembly code in head.S */
 150 struct cpuinfo_x86 new_cpu_data __cpuinitdata = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
 151 /* common cpu data for all cpus */
 152 struct cpuinfo_x86 boot_cpu_data __read_mostly = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
 153 EXPORT_SYMBOL(boot_cpu_data);
 154
 155 unsigned long mmu_cr4_features;
 156
 157 /* for MCA, but anyone else can use it if they want */
 158 unsigned int machine_id;
 159 unsigned int machine_submodel_id;
 160 unsigned int BIOS_revision;
 161 unsigned int mca_pentium_flag;
 162
 163 /* Boot loader ID as an integer, for the benefit of proc_dointvec */
 164 int bootloader_type;
 165
 166 /* user-defined highmem size */
 167 static unsigned int highmem_pages = -1;
 168
 169 /*
 170  * Setup options
 171  */
 172 struct screen_info screen_info;
 173 EXPORT_SYMBOL(screen_info);
 174 struct apm_info apm_info;
 175 EXPORT_SYMBOL(apm_info);
 176 struct edid_info edid_info;
 177 EXPORT_SYMBOL_GPL(edid_info);
 178 struct ist_info ist_info;
 179 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
 180         defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
 181 EXPORT_SYMBOL(ist_info);
 182 #endif
 183
 184 extern void early_cpu_init(void);
 185 extern int root_mountflags;
 186
 187 unsigned long saved_videomode;
 188
 189 #define RAMDISK_IMAGE_START_MASK        0x07FF
 190 #define RAMDISK_PROMPT_FLAG             0x8000
 191 #define RAMDISK_LOAD_FLAG               0x4000
 192
 193 static char __initdata command_line[COMMAND_LINE_SIZE];
 194
 195 #ifndef CONFIG_DEBUG_BOOT_PARAMS
 196 struct boot_params __initdata boot_params;
 197 #else
 198 struct boot_params boot_params;
 199 #endif
 200
 201 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
 202 struct edd edd;
 203 #ifdef CONFIG_EDD_MODULE
 204 EXPORT_SYMBOL(edd);
 205 #endif
 206 /**
 207  * copy_edd() - Copy the BIOS EDD information
 208  *              from boot_params into a safe place.
 209  *
 210  */
 211 static inline void copy_edd(void)
 212 {
 213      memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
 214             sizeof(edd.mbr_signature));
 215      memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
 216      edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
 217      edd.edd_info_nr = boot_params.eddbuf_entries;
 218 }
 219 #else
 220 static inline void copy_edd(void)
 221 {
 222 }
 223 #endif
 224
 225 int __initdata user_defined_memmap = 0;
 226
 227 /*
 228  * "mem=nopentium" disables the 4MB page tables.
 229  * "mem=XXX[kKmM]" defines a memory region from HIGH_MEM
 230  * to <mem>, overriding the bios size.
 231  * "memmap=XXX[KkmM]@XXX[KkmM]" defines a memory region from
 232  * <start> to <start>+<mem>, overriding the bios size.
 233  *
 234  * HPA tells me bootloaders need to parse mem=, so no new
 235  * option should be mem=  [also see Documentation/i386/boot.txt]
 236  */
 237 static int __init parse_mem(char *arg)
 238 {
 239         if (!arg)
 240                 return -EINVAL;
 241
 242         if (strcmp(arg, "nopentium") == 0) {
 243                 setup_clear_cpu_cap(X86_FEATURE_PSE);
 244         } else {
 245                 /* If the user specifies memory size, we
 246                  * limit the BIOS-provided memory map to
 247                  * that size. exactmap can be used to specify
 248                  * the exact map. mem=number can be used to
 249                  * trim the existing memory map.
 250                  */
 251                 unsigned long long mem_size;
 252
 253                 mem_size = memparse(arg, &arg);
 254                 limit_regions(mem_size);
 255                 user_defined_memmap = 1;
 256         }
 257         return 0;
 258 }
 259 early_param("mem", parse_mem);
 260
 261 #ifdef CONFIG_PROC_VMCORE
 262 /* elfcorehdr= specifies the location of elf core header
 263  * stored by the crashed kernel.
 264  */
 265 static int __init parse_elfcorehdr(char *arg)
 266 {
 267         if (!arg)
 268                 return -EINVAL;
 269
 270         elfcorehdr_addr = memparse(arg, &arg);
 271         return 0;
 272 }
 273 early_param("elfcorehdr", parse_elfcorehdr);
 274 #endif /* CONFIG_PROC_VMCORE */
 275
 276 /*
 277  * highmem=size forces highmem to be exactly 'size' bytes.
 278  * This works even on boxes that have no highmem otherwise.
 279  * This also works to reduce highmem size on bigger boxes.
 280  */
 281 static int __init parse_highmem(char *arg)
 282 {
 283         if (!arg)
 284                 return -EINVAL;
 285
 286         highmem_pages = memparse(arg, &arg) >> PAGE_SHIFT;
 287         return 0;
 288 }
 289 early_param("highmem", parse_highmem);
 290
 291 /*
 292  * vmalloc=size forces the vmalloc area to be exactly 'size'
 293  * bytes. This can be used to increase (or decrease) the
 294  * vmalloc area - the default is 128m.
 295  */
 296 static int __init parse_vmalloc(char *arg)
 297 {
 298         if (!arg)
 299                 return -EINVAL;
 300
 301         __VMALLOC_RESERVE = memparse(arg, &arg);
 302         return 0;
 303 }
 304 early_param("vmalloc", parse_vmalloc);
 305
 306 /*
 307  * reservetop=size reserves a hole at the top of the kernel address space which
 308  * a hypervisor can load into later.  Needed for dynamically loaded hypervisors,
 309  * so relocating the fixmap can be done before paging initialization.
 310  */
 311 static int __init parse_reservetop(char *arg)
 312 {
 313         unsigned long address;
 314
 315         if (!arg)
 316                 return -EINVAL;
 317
 318         address = memparse(arg, &arg);
 319         reserve_top_address(address);
 320         return 0;
 321 }
 322 early_param("reservetop", parse_reservetop);
 323
 324 /*
 325  * Determine low and high memory ranges:
 326  */
 327 unsigned long __init find_max_low_pfn(void)
 328 {
 329         unsigned long max_low_pfn;
 330
 331         max_low_pfn = max_pfn;
 332         if (max_low_pfn > MAXMEM_PFN) {
 333                 if (highmem_pages == -1)
 334                         highmem_pages = max_pfn - MAXMEM_PFN;
 335                 if (highmem_pages + MAXMEM_PFN < max_pfn)
 336                         max_pfn = MAXMEM_PFN + highmem_pages;
 337                 if (highmem_pages + MAXMEM_PFN > max_pfn) {
 338                         printk("only %luMB highmem pages available, ignoring highmem size of %uMB.\n", pages_to_mb(max_pfn - MAXMEM_PFN), pages_to_mb(highmem_pages));
 339                         highmem_pages = 0;
 340                 }
 341                 max_low_pfn = MAXMEM_PFN;
 342 #ifndef CONFIG_HIGHMEM
 343                 /* Maximum memory usable is what is directly addressable */
 344                 printk(KERN_WARNING "Warning only %ldMB will be used.\n",
 345                                         MAXMEM>>20);
 346                 if (max_pfn > MAX_NONPAE_PFN)
 347                         printk(KERN_WARNING "Use a HIGHMEM64G enabled kernel.\n");
 348                 else
 349                         printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
 350                 max_pfn = MAXMEM_PFN;
 351 #else /* !CONFIG_HIGHMEM */
 352 #ifndef CONFIG_HIGHMEM64G
 353                 if (max_pfn > MAX_NONPAE_PFN) {
 354                         max_pfn = MAX_NONPAE_PFN;
 355                         printk(KERN_WARNING "Warning only 4GB will be used.\n");
 356                         printk(KERN_WARNING "Use a HIGHMEM64G enabled kernel.\n");
 357                 }
 358 #endif /* !CONFIG_HIGHMEM64G */
 359 #endif /* !CONFIG_HIGHMEM */
 360         } else {
 361                 if (highmem_pages == -1)
 362                         highmem_pages = 0;
 363 #ifdef CONFIG_HIGHMEM
 364                 if (highmem_pages >= max_pfn) {
 365                         printk(KERN_ERR "highmem size specified (%uMB) is bigger than pages available (%luMB)!.\n", pages_to_mb(highmem_pages), pages_to_mb(max_pfn));
 366                         highmem_pages = 0;
 367                 }
 368                 if (highmem_pages) {
 369                         if (max_low_pfn-highmem_pages < 64*1024*1024/PAGE_SIZE){
 370                                 printk(KERN_ERR "highmem size %uMB results in smaller than 64MB lowmem, ignoring it.\n", pages_to_mb(highmem_pages));
 371                                 highmem_pages = 0;
 372                         }
 373                         max_low_pfn -= highmem_pages;
 374                 }
 375 #else
 376                 if (highmem_pages)
 377                         printk(KERN_ERR "ignoring highmem size on non-highmem kernel!\n");
 378 #endif
 379         }
 380         return max_low_pfn;
 381 }
 382
 383 /*
 384  * workaround for Dell systems that neglect to reserve EBDA
 385  */
 386 static void __init reserve_ebda_region(void)
 387 {
 388         unsigned int addr;
 389         addr = get_bios_ebda();
 390         if (addr)
 391                 reserve_bootmem(addr, PAGE_SIZE);
 392 }
 393
 394 #ifndef CONFIG_NEED_MULTIPLE_NODES
 395 void __init setup_bootmem_allocator(void);
 396 static unsigned long __init setup_memory(void)
 397 {
 398         /*
 399          * partially used pages are not usable - thus
 400          * we are rounding upwards:
 401          */
 402         min_low_pfn = PFN_UP(init_pg_tables_end);
 403
 404         find_max_pfn();
 405
 406         max_low_pfn = find_max_low_pfn();
 407
 408 #ifdef CONFIG_HIGHMEM
 409         highstart_pfn = highend_pfn = max_pfn;
 410         if (max_pfn > max_low_pfn) {
 411                 highstart_pfn = max_low_pfn;
 412         }
 413         printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
 414                 pages_to_mb(highend_pfn - highstart_pfn));
 415         num_physpages = highend_pfn;
 416         high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1;
 417 #else
 418         num_physpages = max_low_pfn;
 419         high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1;
 420 #endif
 421 #ifdef CONFIG_FLATMEM
 422         max_mapnr = num_physpages;
 423 #endif
 424         printk(KERN_NOTICE "%ldMB LOWMEM available.\n",
 425                         pages_to_mb(max_low_pfn));
 426
 427         setup_bootmem_allocator();
 428
 429         return max_low_pfn;
 430 }
 431
 432 void __init zone_sizes_init(void)
 433 {
 434         unsigned long max_zone_pfns[MAX_NR_ZONES];
 435         memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
 436         max_zone_pfns[ZONE_DMA] =
 437                 virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
 438         max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
 439 #ifdef CONFIG_HIGHMEM
 440         max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
 441         add_active_range(0, 0, highend_pfn);
 442 #else
 443         add_active_range(0, 0, max_low_pfn);
 444 #endif
 445
 446         free_area_init_nodes(max_zone_pfns);
 447 }
 448 #else
 449 extern unsigned long __init setup_memory(void);
 450 extern void zone_sizes_init(void);
 451 #endif /* !CONFIG_NEED_MULTIPLE_NODES */
 452
 453 static inline unsigned long long get_total_mem(void)
 454 {
 455         unsigned long long total;
 456
 457         total = max_low_pfn - min_low_pfn;
 458 #ifdef CONFIG_HIGHMEM
 459         total += highend_pfn - highstart_pfn;
 460 #endif
 461
 462         return total << PAGE_SHIFT;
 463 }
 464
 465 #ifdef CONFIG_KEXEC
 466 static void __init reserve_crashkernel(void)
 467 {
 468         unsigned long long total_mem;
 469         unsigned long long crash_size, crash_base;
 470         int ret;
 471
 472         total_mem = get_total_mem();
 473
 474         ret = parse_crashkernel(boot_command_line, total_mem,
 475                         &crash_size, &crash_base);
 476         if (ret == 0 && crash_size > 0) {
 477                 if (crash_base > 0) {
 478                         printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
 479                                         "for crashkernel (System RAM: %ldMB)\n",
 480                                         (unsigned long)(crash_size >> 20),
 481                                         (unsigned long)(crash_base >> 20),
 482                                         (unsigned long)(total_mem >> 20));
 483                         crashk_res.start = crash_base;
 484                         crashk_res.end   = crash_base + crash_size - 1;
 485                         reserve_bootmem(crash_base, crash_size);
 486                 } else
 487                         printk(KERN_INFO "crashkernel reservation failed - "
 488                                         "you have to specify a base address\n");
 489         }
 490 }
 491 #else
 492 static inline void __init reserve_crashkernel(void)
 493 {}
 494 #endif
 495
 496 #ifdef CONFIG_BLK_DEV_INITRD
 497
 498 static bool do_relocate_initrd = false;
 499
 500 static void __init reserve_initrd(void)
 501 {
 502         unsigned long ramdisk_image = boot_params.hdr.ramdisk_image;
 503         unsigned long ramdisk_size  = boot_params.hdr.ramdisk_size;
 504         unsigned long ramdisk_end   = ramdisk_image + ramdisk_size;
 505         unsigned long end_of_lowmem = max_low_pfn << PAGE_SHIFT;
 506         unsigned long ramdisk_here;
 507
 508         initrd_start = 0;
 509
 510         if (!boot_params.hdr.type_of_loader ||
 511             !ramdisk_image || !ramdisk_size)
 512                 return;         /* No initrd provided by bootloader */
 513
 514         if (ramdisk_end < ramdisk_image) {
 515                 printk(KERN_ERR "initrd wraps around end of memory, "
 516                        "disabling initrd\n");
 517                 return;
 518         }
 519         if (ramdisk_size >= end_of_lowmem/2) {
 520                 printk(KERN_ERR "initrd too large to handle, "
 521                        "disabling initrd\n");
 522                 return;
 523         }
 524         if (ramdisk_end <= end_of_lowmem) {
 525                 /* All in lowmem, easy case */
 526                 reserve_bootmem(ramdisk_image, ramdisk_size);
 527                 initrd_start = ramdisk_image + PAGE_OFFSET;
 528                 initrd_end = initrd_start+ramdisk_size;
 529                 return;
 530         }
 531
 532         /* We need to move the initrd down into lowmem */
 533         ramdisk_here = (end_of_lowmem - ramdisk_size) & PAGE_MASK;
 534
 535         /* Note: this includes all the lowmem currently occupied by
 536            the initrd, we rely on that fact to keep the data intact. */
 537         reserve_bootmem(ramdisk_here, ramdisk_size);
 538         initrd_start = ramdisk_here + PAGE_OFFSET;
 539         initrd_end   = initrd_start + ramdisk_size;
 540
 541         do_relocate_initrd = true;
 542 }
 543
 544 #define MAX_MAP_CHUNK   (NR_FIX_BTMAPS << PAGE_SHIFT)
 545
 546 static void __init relocate_initrd(void)
 547 {
 548         unsigned long ramdisk_image = boot_params.hdr.ramdisk_image;
 549         unsigned long ramdisk_size  = boot_params.hdr.ramdisk_size;
 550         unsigned long end_of_lowmem = max_low_pfn << PAGE_SHIFT;
 551         unsigned long ramdisk_here;
 552         unsigned long slop, clen, mapaddr;
 553         char *p, *q;
 554
 555         if (!do_relocate_initrd)
 556                 return;
 557
 558         ramdisk_here = initrd_start - PAGE_OFFSET;
 559
 560         q = (char *)initrd_start;
 561
 562         /* Copy any lowmem portion of the initrd */
 563         if (ramdisk_image < end_of_lowmem) {
 564                 clen = end_of_lowmem - ramdisk_image;
 565                 p = (char *)__va(ramdisk_image);
 566                 memcpy(q, p, clen);
 567                 q += clen;
 568                 ramdisk_image += clen;
 569                 ramdisk_size  -= clen;
 570         }
 571
 572         /* Copy the highmem portion of the initrd */
 573         while (ramdisk_size) {
 574                 slop = ramdisk_image & ~PAGE_MASK;
 575                 clen = ramdisk_size;
 576                 if (clen > MAX_MAP_CHUNK-slop)
 577                         clen = MAX_MAP_CHUNK-slop;
 578                 mapaddr = ramdisk_image & PAGE_MASK;
 579                 p = bt_ioremap(mapaddr, clen+slop);
 580                 memcpy(q, p+slop, clen);
 581                 bt_iounmap(p, clen+slop);
 582                 q += clen;
 583                 ramdisk_image += clen;
 584                 ramdisk_size  -= clen;
 585         }
 586 }
 587
 588 #endif /* CONFIG_BLK_DEV_INITRD */
 589
 590 void __init setup_bootmem_allocator(void)
 591 {
 592         unsigned long bootmap_size;
 593         /*
 594          * Initialize the boot-time allocator (with low memory only):
 595          */
 596         bootmap_size = init_bootmem(min_low_pfn, max_low_pfn);
 597
 598         register_bootmem_low_pages(max_low_pfn);
 599
 600         /*
 601          * Reserve the bootmem bitmap itself as well. We do this in two
 602          * steps (first step was init_bootmem()) because this catches
 603          * the (very unlikely) case of us accidentally initializing the
 604          * bootmem allocator with an invalid RAM area.
 605          */
 606         reserve_bootmem(__pa_symbol(_text), (PFN_PHYS(min_low_pfn) +
 607                          bootmap_size + PAGE_SIZE-1) - __pa_symbol(_text));
 608
 609         /*
 610          * reserve physical page 0 - it's a special BIOS page on many boxes,
 611          * enabling clean reboots, SMP operation, laptop functions.
 612          */
 613         reserve_bootmem(0, PAGE_SIZE);
 614
 615         /* reserve EBDA region, it's a 4K region */
 616         reserve_ebda_region();
 617
 618     /* could be an AMD 768MPX chipset. Reserve a page  before VGA to prevent
 619        PCI prefetch into it (errata #56). Usually the page is reserved anyways,
 620        unless you have no PS/2 mouse plugged in. */
 621         if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
 622             boot_cpu_data.x86 == 6)
 623              reserve_bootmem(0xa0000 - 4096, 4096);
 624
 625 #ifdef CONFIG_SMP
 626         /*
 627          * But first pinch a few for the stack/trampoline stuff
 628          * FIXME: Don't need the extra page at 4K, but need to fix
 629          * trampoline before removing it. (see the GDT stuff)
 630          */
 631         reserve_bootmem(PAGE_SIZE, PAGE_SIZE);
 632 #endif
 633 #ifdef CONFIG_ACPI_SLEEP
 634         /*
 635          * Reserve low memory region for sleep support.
 636          */
 637         acpi_reserve_bootmem();
 638 #endif
 639 #ifdef CONFIG_X86_FIND_SMP_CONFIG
 640         /*
 641          * Find and reserve possible boot-time SMP configuration:
 642          */
 643         find_smp_config();
 644 #endif
 645 #ifdef CONFIG_BLK_DEV_INITRD
 646         reserve_initrd();
 647 #endif
 648         numa_kva_reserve();
 649         reserve_crashkernel();
 650 }
 651
 652 /*
 653  * The node 0 pgdat is initialized before all of these because
 654  * it's needed for bootmem.  node>0 pgdats have their virtual
 655  * space allocated before the pagetables are in place to access
 656  * them, so they can't be cleared then.
 657  *
 658  * This should all compile down to nothing when NUMA is off.
 659  */
 660 static void __init remapped_pgdat_init(void)
 661 {
 662         int nid;
 663
 664         for_each_online_node(nid) {
 665                 if (nid != 0)
 666                         memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
 667         }
 668 }
 669
 670 #ifdef CONFIG_MCA
 671 static void set_mca_bus(int x)
 672 {
 673         MCA_bus = x;
 674 }
 675 #else
 676 static void set_mca_bus(int x) { }
 677 #endif
 678
 679 /* Overridden in paravirt.c if CONFIG_PARAVIRT */
 680 char * __init __attribute__((weak)) memory_setup(void)
 681 {
 682         return machine_specific_memory_setup();
 683 }
 684
 685 /*
 686  * Determine if we were loaded by an EFI loader.  If so, then we have also been
 687  * passed the efi memmap, systab, etc., so we should use these data structures
 688  * for initialization.  Note, the efi init code path is determined by the
 689  * global efi_enabled. This allows the same kernel image to be used on existing
 690  * systems (with a traditional BIOS) as well as on EFI systems.
 691  */
 692 void __init setup_arch(char **cmdline_p)
 693 {
 694         unsigned long max_low_pfn;
 695
 696         memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
 697         pre_setup_arch_hook();
 698         early_cpu_init();
 699
 700 #ifdef CONFIG_EFI
 701         if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
 702                      "EL32", 4))
 703                 efi_enabled = 1;
 704 #endif
 705
 706         ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
 707         screen_info = boot_params.screen_info;
 708         edid_info = boot_params.edid_info;
 709         apm_info.bios = boot_params.apm_bios_info;
 710         ist_info = boot_params.ist_info;
 711         saved_videomode = boot_params.hdr.vid_mode;
 712         if( boot_params.sys_desc_table.length != 0 ) {
 713                 set_mca_bus(boot_params.sys_desc_table.table[3] & 0x2);
 714                 machine_id = boot_params.sys_desc_table.table[0];
 715                 machine_submodel_id = boot_params.sys_desc_table.table[1];
 716                 BIOS_revision = boot_params.sys_desc_table.table[2];
 717         }
 718         bootloader_type = boot_params.hdr.type_of_loader;
 719
 720 #ifdef CONFIG_BLK_DEV_RAM
 721         rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
 722         rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
 723         rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
 724 #endif
 725         ARCH_SETUP
 726
 727         printk(KERN_INFO "BIOS-provided physical RAM map:\n");
 728         print_memory_map(memory_setup());
 729
 730         copy_edd();
 731
 732         if (!boot_params.hdr.root_flags)
 733                 root_mountflags &= ~MS_RDONLY;
 734         init_mm.start_code = (unsigned long) _text;
 735         init_mm.end_code = (unsigned long) _etext;
 736         init_mm.end_data = (unsigned long) _edata;
 737         init_mm.brk = init_pg_tables_end + PAGE_OFFSET;
 738
 739         code_resource.start = virt_to_phys(_text);
 740         code_resource.end = virt_to_phys(_etext)-1;
 741         data_resource.start = virt_to_phys(_etext);
 742         data_resource.end = virt_to_phys(_edata)-1;
 743         bss_resource.start = virt_to_phys(&__bss_start);
 744         bss_resource.end = virt_to_phys(&__bss_stop)-1;
 745
 746         parse_early_param();
 747
 748         if (user_defined_memmap) {
 749                 printk(KERN_INFO "user-defined physical RAM map:\n");
 750                 print_memory_map("user");
 751         }
 752
 753         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 754         *cmdline_p = command_line;
 755
 756         if (efi_enabled)
 757                 efi_init();
 758
 759         max_low_pfn = setup_memory();
 760
 761 #ifdef CONFIG_VMI
 762         /*
 763          * Must be after max_low_pfn is determined, and before kernel
 764          * pagetables are setup.
 765          */
 766         vmi_init();
 767 #endif
 768
 769         /*
 770          * NOTE: before this point _nobody_ is allowed to allocate
 771          * any memory using the bootmem allocator.  Although the
 772          * allocator is now initialised only the first 8Mb of the kernel
 773          * virtual address space has been mapped.  All allocations before
 774          * paging_init() has completed must use the alloc_bootmem_low_pages()
 775          * variant (which allocates DMA'able memory) and care must be taken
 776          * not to exceed the 8Mb limit.
 777          */
 778
 779 #ifdef CONFIG_SMP
 780         smp_alloc_memory(); /* AP processor realmode stacks in low memory*/
 781 #endif
 782         paging_init();
 783         remapped_pgdat_init();
 784         sparse_init();
 785         zone_sizes_init();
 786
 787         /*
 788          * NOTE: at this point the bootmem allocator is fully available.
 789          */
 790
 791 #ifdef CONFIG_BLK_DEV_INITRD
 792         relocate_initrd();
 793 #endif
 794
 795         paravirt_post_allocator_init();
 796
 797         dmi_scan_machine();
 798
 799         io_delay_init();
 800
 801 #ifdef CONFIG_X86_GENERICARCH
 802         generic_apic_probe();
 803 #endif
 804         if (efi_enabled)
 805                 efi_map_memmap();
 806
 807 #ifdef CONFIG_ACPI
 808         /*
 809          * Parse the ACPI tables for possible boot-time SMP configuration.
 810          */
 811         acpi_boot_table_init();
 812 #endif
 813
 814         early_quirks();
 815
 816 #ifdef CONFIG_ACPI
 817         acpi_boot_init();
 818
 819 #if defined(CONFIG_SMP) && defined(CONFIG_X86_PC)
 820         if (def_to_bigsmp)
 821                 printk(KERN_WARNING "More than 8 CPUs detected and "
 822                         "CONFIG_X86_PC cannot handle it.\nUse "
 823                         "CONFIG_X86_GENERICARCH or CONFIG_X86_BIGSMP.\n");
 824 #endif
 825 #endif
 826 #ifdef CONFIG_X86_LOCAL_APIC
 827         if (smp_found_config)
 828                 get_smp_config();
 829 #endif
 830
 831         e820_register_memory();
 832         e820_mark_nosave_regions();
 833
 834 #ifdef CONFIG_VT
 835 #if defined(CONFIG_VGA_CONSOLE)
 836         if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
 837                 conswitchp = &vga_con;
 838 #elif defined(CONFIG_DUMMY_CONSOLE)
 839         conswitchp = &dummy_con;
 840 #endif
 841 #endif
 842 }
 843
 844 /*
 845  * Request address space for all standard resources
 846  *
 847  * This is called just before pcibios_init(), which is also a
 848  * subsys_initcall, but is linked in later (in arch/i386/pci/common.c).
 849  */
 850 static int __init request_standard_resources(void)
 851 {
 852         int i;
 853
 854         printk(KERN_INFO "Setting up standard PCI resources\n");
 855         init_iomem_resources(&code_resource, &data_resource, &bss_resource);
 856
 857         request_resource(&iomem_resource, &video_ram_resource);
 858
 859         /* request I/O space for devices used on all i[345]86 PCs */
 860         for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
 861                 request_resource(&ioport_resource, &standard_io_resources[i]);
 862         return 0;
 863 }
 864
 865 subsys_initcall(request_standard_resources);