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 #include <linux/init_ohci1394_dma.h>
  49
  50 #include <video/edid.h>
  51
  52 #include <asm/mtrr.h>
  53 #include <asm/apic.h>
  54 #include <asm/e820.h>
  55 #include <asm/mpspec.h>
  56 #include <asm/mmzone.h>
  57 #include <asm/setup.h>
  58 #include <asm/arch_hooks.h>
  59 #include <asm/sections.h>
  60 #include <asm/io_apic.h>
  61 #include <asm/ist.h>
  62 #include <asm/io.h>
  63 #include <asm/vmi.h>
  64 #include <setup_arch.h>
  65 #include <bios_ebda.h>
  66 #include <asm/cacheflush.h>
  67
  68 /* This value is set up by the early boot code to point to the value
  69    immediately after the boot time page tables.  It contains a *physical*
  70    address, and must not be in the .bss segment! */
  71 unsigned long init_pg_tables_end __initdata = ~0UL;
  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                 setup_clear_cpu_cap(X86_FEATURE_PSE);
 246         } else {
 247                 /* If the user specifies memory size, we
 248                  * limit the BIOS-provided memory map to
 249                  * that size. exactmap can be used to specify
 250                  * the exact map. mem=number can be used to
 251                  * trim the existing memory map.
 252                  */
 253                 unsigned long long mem_size;
 254
 255                 mem_size = memparse(arg, &arg);
 256                 limit_regions(mem_size);
 257                 user_defined_memmap = 1;
 258         }
 259         return 0;
 260 }
 261 early_param("mem", parse_mem);
 262
 263 #ifdef CONFIG_PROC_VMCORE
 264 /* elfcorehdr= specifies the location of elf core header
 265  * stored by the crashed kernel.
 266  */
 267 static int __init parse_elfcorehdr(char *arg)
 268 {
 269         if (!arg)
 270                 return -EINVAL;
 271
 272         elfcorehdr_addr = memparse(arg, &arg);
 273         return 0;
 274 }
 275 early_param("elfcorehdr", parse_elfcorehdr);
 276 #endif /* CONFIG_PROC_VMCORE */
 277
 278 /*
 279  * highmem=size forces highmem to be exactly 'size' bytes.
 280  * This works even on boxes that have no highmem otherwise.
 281  * This also works to reduce highmem size on bigger boxes.
 282  */
 283 static int __init parse_highmem(char *arg)
 284 {
 285         if (!arg)
 286                 return -EINVAL;
 287
 288         highmem_pages = memparse(arg, &arg) >> PAGE_SHIFT;
 289         return 0;
 290 }
 291 early_param("highmem", parse_highmem);
 292
 293 /*
 294  * vmalloc=size forces the vmalloc area to be exactly 'size'
 295  * bytes. This can be used to increase (or decrease) the
 296  * vmalloc area - the default is 128m.
 297  */
 298 static int __init parse_vmalloc(char *arg)
 299 {
 300         if (!arg)
 301                 return -EINVAL;
 302
 303         __VMALLOC_RESERVE = memparse(arg, &arg);
 304         return 0;
 305 }
 306 early_param("vmalloc", parse_vmalloc);
 307
 308 /*
 309  * reservetop=size reserves a hole at the top of the kernel address space which
 310  * a hypervisor can load into later.  Needed for dynamically loaded hypervisors,
 311  * so relocating the fixmap can be done before paging initialization.
 312  */
 313 static int __init parse_reservetop(char *arg)
 314 {
 315         unsigned long address;
 316
 317         if (!arg)
 318                 return -EINVAL;
 319
 320         address = memparse(arg, &arg);
 321         reserve_top_address(address);
 322         return 0;
 323 }
 324 early_param("reservetop", parse_reservetop);
 325
 326 /*
 327  * Determine low and high memory ranges:
 328  */
 329 unsigned long __init find_max_low_pfn(void)
 330 {
 331         unsigned long max_low_pfn;
 332
 333         max_low_pfn = max_pfn;
 334         if (max_low_pfn > MAXMEM_PFN) {
 335                 if (highmem_pages == -1)
 336                         highmem_pages = max_pfn - MAXMEM_PFN;
 337                 if (highmem_pages + MAXMEM_PFN < max_pfn)
 338                         max_pfn = MAXMEM_PFN + highmem_pages;
 339                 if (highmem_pages + MAXMEM_PFN > max_pfn) {
 340                         printk("only %luMB highmem pages available, ignoring highmem size of %uMB.\n", pages_to_mb(max_pfn - MAXMEM_PFN), pages_to_mb(highmem_pages));
 341                         highmem_pages = 0;
 342                 }
 343                 max_low_pfn = MAXMEM_PFN;
 344 #ifndef CONFIG_HIGHMEM
 345                 /* Maximum memory usable is what is directly addressable */
 346                 printk(KERN_WARNING "Warning only %ldMB will be used.\n",
 347                                         MAXMEM>>20);
 348                 if (max_pfn > MAX_NONPAE_PFN)
 349                         printk(KERN_WARNING "Use a HIGHMEM64G enabled kernel.\n");
 350                 else
 351                         printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
 352                 max_pfn = MAXMEM_PFN;
 353 #else /* !CONFIG_HIGHMEM */
 354 #ifndef CONFIG_HIGHMEM64G
 355                 if (max_pfn > MAX_NONPAE_PFN) {
 356                         max_pfn = MAX_NONPAE_PFN;
 357                         printk(KERN_WARNING "Warning only 4GB will be used.\n");
 358                         printk(KERN_WARNING "Use a HIGHMEM64G enabled kernel.\n");
 359                 }
 360 #endif /* !CONFIG_HIGHMEM64G */
 361 #endif /* !CONFIG_HIGHMEM */
 362         } else {
 363                 if (highmem_pages == -1)
 364                         highmem_pages = 0;
 365 #ifdef CONFIG_HIGHMEM
 366                 if (highmem_pages >= max_pfn) {
 367                         printk(KERN_ERR "highmem size specified (%uMB) is bigger than pages available (%luMB)!.\n", pages_to_mb(highmem_pages), pages_to_mb(max_pfn));
 368                         highmem_pages = 0;
 369                 }
 370                 if (highmem_pages) {
 371                         if (max_low_pfn-highmem_pages < 64*1024*1024/PAGE_SIZE){
 372                                 printk(KERN_ERR "highmem size %uMB results in smaller than 64MB lowmem, ignoring it.\n", pages_to_mb(highmem_pages));
 373                                 highmem_pages = 0;
 374                         }
 375                         max_low_pfn -= highmem_pages;
 376                 }
 377 #else
 378                 if (highmem_pages)
 379                         printk(KERN_ERR "ignoring highmem size on non-highmem kernel!\n");
 380 #endif
 381         }
 382         return max_low_pfn;
 383 }
 384
 385 /*
 386  * workaround for Dell systems that neglect to reserve EBDA
 387  */
 388 static void __init reserve_ebda_region(void)
 389 {
 390         unsigned int addr;
 391         addr = get_bios_ebda();
 392         if (addr)
 393                 reserve_bootmem(addr, PAGE_SIZE);
 394 }
 395
 396 #ifndef CONFIG_NEED_MULTIPLE_NODES
 397 void __init setup_bootmem_allocator(void);
 398 static unsigned long __init setup_memory(void)
 399 {
 400         /*
 401          * partially used pages are not usable - thus
 402          * we are rounding upwards:
 403          */
 404         min_low_pfn = PFN_UP(init_pg_tables_end);
 405
 406         find_max_pfn();
 407
 408         max_low_pfn = find_max_low_pfn();
 409
 410 #ifdef CONFIG_HIGHMEM
 411         highstart_pfn = highend_pfn = max_pfn;
 412         if (max_pfn > max_low_pfn) {
 413                 highstart_pfn = max_low_pfn;
 414         }
 415         printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
 416                 pages_to_mb(highend_pfn - highstart_pfn));
 417         num_physpages = highend_pfn;
 418         high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1;
 419 #else
 420         num_physpages = max_low_pfn;
 421         high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1;
 422 #endif
 423 #ifdef CONFIG_FLATMEM
 424         max_mapnr = num_physpages;
 425 #endif
 426         printk(KERN_NOTICE "%ldMB LOWMEM available.\n",
 427                         pages_to_mb(max_low_pfn));
 428
 429         setup_bootmem_allocator();
 430
 431         return max_low_pfn;
 432 }
 433
 434 void __init zone_sizes_init(void)
 435 {
 436         unsigned long max_zone_pfns[MAX_NR_ZONES];
 437         memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
 438         max_zone_pfns[ZONE_DMA] =
 439                 virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
 440         max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
 441 #ifdef CONFIG_HIGHMEM
 442         max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
 443         add_active_range(0, 0, highend_pfn);
 444 #else
 445         add_active_range(0, 0, max_low_pfn);
 446 #endif
 447
 448         free_area_init_nodes(max_zone_pfns);
 449 }
 450 #else
 451 extern unsigned long __init setup_memory(void);
 452 extern void zone_sizes_init(void);
 453 #endif /* !CONFIG_NEED_MULTIPLE_NODES */
 454
 455 static inline unsigned long long get_total_mem(void)
 456 {
 457         unsigned long long total;
 458
 459         total = max_low_pfn - min_low_pfn;
 460 #ifdef CONFIG_HIGHMEM
 461         total += highend_pfn - highstart_pfn;
 462 #endif
 463
 464         return total << PAGE_SHIFT;
 465 }
 466
 467 #ifdef CONFIG_KEXEC
 468 static void __init reserve_crashkernel(void)
 469 {
 470         unsigned long long total_mem;
 471         unsigned long long crash_size, crash_base;
 472         int ret;
 473
 474         total_mem = get_total_mem();
 475
 476         ret = parse_crashkernel(boot_command_line, total_mem,
 477                         &crash_size, &crash_base);
 478         if (ret == 0 && crash_size > 0) {
 479                 if (crash_base > 0) {
 480                         printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
 481                                         "for crashkernel (System RAM: %ldMB)\n",
 482                                         (unsigned long)(crash_size >> 20),
 483                                         (unsigned long)(crash_base >> 20),
 484                                         (unsigned long)(total_mem >> 20));
 485                         crashk_res.start = crash_base;
 486                         crashk_res.end   = crash_base + crash_size - 1;
 487                         reserve_bootmem(crash_base, crash_size);
 488                 } else
 489                         printk(KERN_INFO "crashkernel reservation failed - "
 490                                         "you have to specify a base address\n");
 491         }
 492 }
 493 #else
 494 static inline void __init reserve_crashkernel(void)
 495 {}
 496 #endif
 497
 498 #ifdef CONFIG_BLK_DEV_INITRD
 499
 500 static bool do_relocate_initrd = false;
 501
 502 static void __init reserve_initrd(void)
 503 {
 504         unsigned long ramdisk_image = boot_params.hdr.ramdisk_image;
 505         unsigned long ramdisk_size  = boot_params.hdr.ramdisk_size;
 506         unsigned long ramdisk_end   = ramdisk_image + ramdisk_size;
 507         unsigned long end_of_lowmem = max_low_pfn << PAGE_SHIFT;
 508         unsigned long ramdisk_here;
 509
 510         initrd_start = 0;
 511
 512         if (!boot_params.hdr.type_of_loader ||
 513             !ramdisk_image || !ramdisk_size)
 514                 return;         /* No initrd provided by bootloader */
 515
 516         if (ramdisk_end < ramdisk_image) {
 517                 printk(KERN_ERR "initrd wraps around end of memory, "
 518                        "disabling initrd\n");
 519                 return;
 520         }
 521         if (ramdisk_size >= end_of_lowmem/2) {
 522                 printk(KERN_ERR "initrd too large to handle, "
 523                        "disabling initrd\n");
 524                 return;
 525         }
 526         if (ramdisk_end <= end_of_lowmem) {
 527                 /* All in lowmem, easy case */
 528                 reserve_bootmem(ramdisk_image, ramdisk_size);
 529                 initrd_start = ramdisk_image + PAGE_OFFSET;
 530                 initrd_end = initrd_start+ramdisk_size;
 531                 return;
 532         }
 533
 534         /* We need to move the initrd down into lowmem */
 535         ramdisk_here = (end_of_lowmem - ramdisk_size) & PAGE_MASK;
 536
 537         /* Note: this includes all the lowmem currently occupied by
 538            the initrd, we rely on that fact to keep the data intact. */
 539         reserve_bootmem(ramdisk_here, ramdisk_size);
 540         initrd_start = ramdisk_here + PAGE_OFFSET;
 541         initrd_end   = initrd_start + ramdisk_size;
 542
 543         do_relocate_initrd = true;
 544 }
 545
 546 #define MAX_MAP_CHUNK   (NR_FIX_BTMAPS << PAGE_SHIFT)
 547
 548 static void __init relocate_initrd(void)
 549 {
 550         unsigned long ramdisk_image = boot_params.hdr.ramdisk_image;
 551         unsigned long ramdisk_size  = boot_params.hdr.ramdisk_size;
 552         unsigned long end_of_lowmem = max_low_pfn << PAGE_SHIFT;
 553         unsigned long ramdisk_here;
 554         unsigned long slop, clen, mapaddr;
 555         char *p, *q;
 556
 557         if (!do_relocate_initrd)
 558                 return;
 559
 560         ramdisk_here = initrd_start - PAGE_OFFSET;
 561
 562         q = (char *)initrd_start;
 563
 564         /* Copy any lowmem portion of the initrd */
 565         if (ramdisk_image < end_of_lowmem) {
 566                 clen = end_of_lowmem - ramdisk_image;
 567                 p = (char *)__va(ramdisk_image);
 568                 memcpy(q, p, clen);
 569                 q += clen;
 570                 ramdisk_image += clen;
 571                 ramdisk_size  -= clen;
 572         }
 573
 574         /* Copy the highmem portion of the initrd */
 575         while (ramdisk_size) {
 576                 slop = ramdisk_image & ~PAGE_MASK;
 577                 clen = ramdisk_size;
 578                 if (clen > MAX_MAP_CHUNK-slop)
 579                         clen = MAX_MAP_CHUNK-slop;
 580                 mapaddr = ramdisk_image & PAGE_MASK;
 581                 p = early_ioremap(mapaddr, clen+slop);
 582                 memcpy(q, p+slop, clen);
 583                 early_iounmap(p, clen+slop);
 584                 q += clen;
 585                 ramdisk_image += clen;
 586                 ramdisk_size  -= clen;
 587         }
 588 }
 589
 590 #endif /* CONFIG_BLK_DEV_INITRD */
 591
 592 void __init setup_bootmem_allocator(void)
 593 {
 594         unsigned long bootmap_size;
 595         /*
 596          * Initialize the boot-time allocator (with low memory only):
 597          */
 598         bootmap_size = init_bootmem(min_low_pfn, max_low_pfn);
 599
 600         register_bootmem_low_pages(max_low_pfn);
 601
 602         /*
 603          * Reserve the bootmem bitmap itself as well. We do this in two
 604          * steps (first step was init_bootmem()) because this catches
 605          * the (very unlikely) case of us accidentally initializing the
 606          * bootmem allocator with an invalid RAM area.
 607          */
 608         reserve_bootmem(__pa_symbol(_text), (PFN_PHYS(min_low_pfn) +
 609                          bootmap_size + PAGE_SIZE-1) - __pa_symbol(_text));
 610
 611         /*
 612          * reserve physical page 0 - it's a special BIOS page on many boxes,
 613          * enabling clean reboots, SMP operation, laptop functions.
 614          */
 615         reserve_bootmem(0, PAGE_SIZE);
 616
 617         /* reserve EBDA region, it's a 4K region */
 618         reserve_ebda_region();
 619
 620     /* could be an AMD 768MPX chipset. Reserve a page  before VGA to prevent
 621        PCI prefetch into it (errata #56). Usually the page is reserved anyways,
 622        unless you have no PS/2 mouse plugged in. */
 623         if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
 624             boot_cpu_data.x86 == 6)
 625              reserve_bootmem(0xa0000 - 4096, 4096);
 626
 627 #ifdef CONFIG_SMP
 628         /*
 629          * But first pinch a few for the stack/trampoline stuff
 630          * FIXME: Don't need the extra page at 4K, but need to fix
 631          * trampoline before removing it. (see the GDT stuff)
 632          */
 633         reserve_bootmem(PAGE_SIZE, PAGE_SIZE);
 634 #endif
 635 #ifdef CONFIG_ACPI_SLEEP
 636         /*
 637          * Reserve low memory region for sleep support.
 638          */
 639         acpi_reserve_bootmem();
 640 #endif
 641 #ifdef CONFIG_X86_FIND_SMP_CONFIG
 642         /*
 643          * Find and reserve possible boot-time SMP configuration:
 644          */
 645         find_smp_config();
 646 #endif
 647 #ifdef CONFIG_BLK_DEV_INITRD
 648         reserve_initrd();
 649 #endif
 650         numa_kva_reserve();
 651         reserve_crashkernel();
 652 }
 653
 654 /*
 655  * The node 0 pgdat is initialized before all of these because
 656  * it's needed for bootmem.  node>0 pgdats have their virtual
 657  * space allocated before the pagetables are in place to access
 658  * them, so they can't be cleared then.
 659  *
 660  * This should all compile down to nothing when NUMA is off.
 661  */
 662 static void __init remapped_pgdat_init(void)
 663 {
 664         int nid;
 665
 666         for_each_online_node(nid) {
 667                 if (nid != 0)
 668                         memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
 669         }
 670 }
 671
 672 #ifdef CONFIG_MCA
 673 static void set_mca_bus(int x)
 674 {
 675         MCA_bus = x;
 676 }
 677 #else
 678 static void set_mca_bus(int x) { }
 679 #endif
 680
 681 /* Overridden in paravirt.c if CONFIG_PARAVIRT */
 682 char * __init __attribute__((weak)) memory_setup(void)
 683 {
 684         return machine_specific_memory_setup();
 685 }
 686
 687 /*
 688  * Determine if we were loaded by an EFI loader.  If so, then we have also been
 689  * passed the efi memmap, systab, etc., so we should use these data structures
 690  * for initialization.  Note, the efi init code path is determined by the
 691  * global efi_enabled. This allows the same kernel image to be used on existing
 692  * systems (with a traditional BIOS) as well as on EFI systems.
 693  */
 694 void __init setup_arch(char **cmdline_p)
 695 {
 696         unsigned long max_low_pfn;
 697
 698         memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
 699         pre_setup_arch_hook();
 700         early_cpu_init();
 701         early_ioremap_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         /* update e820 for memory not covered by WB MTRRs */
 765         mtrr_bp_init();
 766         if (mtrr_trim_uncached_memory(max_pfn))
 767                 max_low_pfn = setup_memory();
 768
 769 #ifdef CONFIG_VMI
 770         /*
 771          * Must be after max_low_pfn is determined, and before kernel
 772          * pagetables are setup.
 773          */
 774         vmi_init();
 775 #endif
 776
 777         /*
 778          * NOTE: before this point _nobody_ is allowed to allocate
 779          * any memory using the bootmem allocator.  Although the
 780          * allocator is now initialised only the first 8Mb of the kernel
 781          * virtual address space has been mapped.  All allocations before
 782          * paging_init() has completed must use the alloc_bootmem_low_pages()
 783          * variant (which allocates DMA'able memory) and care must be taken
 784          * not to exceed the 8Mb limit.
 785          */
 786
 787 #ifdef CONFIG_SMP
 788         smp_alloc_memory(); /* AP processor realmode stacks in low memory*/
 789 #endif
 790         paging_init();
 791
 792         /*
 793          * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
 794          */
 795
 796 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
 797         if (init_ohci1394_dma_early)
 798                 init_ohci1394_dma_on_all_controllers();
 799 #endif
 800
 801         remapped_pgdat_init();
 802         sparse_init();
 803         zone_sizes_init();
 804
 805         /*
 806          * NOTE: at this point the bootmem allocator is fully available.
 807          */
 808
 809 #ifdef CONFIG_BLK_DEV_INITRD
 810         relocate_initrd();
 811 #endif
 812
 813         paravirt_post_allocator_init();
 814
 815         dmi_scan_machine();
 816
 817         io_delay_init();
 818
 819 #ifdef CONFIG_X86_GENERICARCH
 820         generic_apic_probe();
 821 #endif
 822
 823 #ifdef CONFIG_ACPI
 824         /*
 825          * Parse the ACPI tables for possible boot-time SMP configuration.
 826          */
 827         acpi_boot_table_init();
 828 #endif
 829
 830         early_quirks();
 831
 832 #ifdef CONFIG_ACPI
 833         acpi_boot_init();
 834
 835 #if defined(CONFIG_SMP) && defined(CONFIG_X86_PC)
 836         if (def_to_bigsmp)
 837                 printk(KERN_WARNING "More than 8 CPUs detected and "
 838                         "CONFIG_X86_PC cannot handle it.\nUse "
 839                         "CONFIG_X86_GENERICARCH or CONFIG_X86_BIGSMP.\n");
 840 #endif
 841 #endif
 842 #ifdef CONFIG_X86_LOCAL_APIC
 843         if (smp_found_config)
 844                 get_smp_config();
 845 #endif
 846
 847         e820_register_memory();
 848         e820_mark_nosave_regions();
 849
 850 #ifdef CONFIG_VT
 851 #if defined(CONFIG_VGA_CONSOLE)
 852         if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
 853                 conswitchp = &vga_con;
 854 #elif defined(CONFIG_DUMMY_CONSOLE)
 855         conswitchp = &dummy_con;
 856 #endif
 857 #endif
 858 }
 859
 860 /*
 861  * Request address space for all standard resources
 862  *
 863  * This is called just before pcibios_init(), which is also a
 864  * subsys_initcall, but is linked in later (in arch/i386/pci/common.c).
 865  */
 866 static int __init request_standard_resources(void)
 867 {
 868         int i;
 869
 870         printk(KERN_INFO "Setting up standard PCI resources\n");
 871         init_iomem_resources(&code_resource, &data_resource, &bss_resource);
 872
 873         request_resource(&iomem_resource, &video_ram_resource);
 874
 875         /* request I/O space for devices used on all i[345]86 PCs */
 876         for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
 877                 request_resource(&ioport_resource, &standard_io_resources[i]);
 878         return 0;
 879 }
 880
 881 subsys_initcall(request_standard_resources);