arch/x86/kernel/setup.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/iscsi_ibft.h>
  43 #include <linux/nodemask.h>
  44 #include <linux/kexec.h>
  45 #include <linux/dmi.h>
  46 #include <linux/pfn.h>
  47 #include <linux/pci.h>
  48 #include <asm/pci-direct.h>
  49 #include <linux/init_ohci1394_dma.h>
  50 #include <linux/kvm_para.h>
  51
  52 #include <linux/errno.h>
  53 #include <linux/kernel.h>
  54 #include <linux/stddef.h>
  55 #include <linux/unistd.h>
  56 #include <linux/ptrace.h>
  57 #include <linux/slab.h>
  58 #include <linux/user.h>
  59 #include <linux/delay.h>
  60 #include <linux/highmem.h>
  61
  62 #include <linux/kallsyms.h>
  63 #include <linux/edd.h>
  64 #include <linux/iscsi_ibft.h>
  65 #include <linux/kexec.h>
  66 #include <linux/cpufreq.h>
  67 #include <linux/dma-mapping.h>
  68 #include <linux/ctype.h>
  69 #include <linux/uaccess.h>
  70
  71 #include <linux/percpu.h>
  72 #include <linux/crash_dump.h>
  73
  74 #include <video/edid.h>
  75
  76 #include <asm/mtrr.h>
  77 #include <asm/apic.h>
  78 #include <asm/e820.h>
  79 #include <asm/mpspec.h>
  80 #include <asm/setup.h>
  81 #include <asm/arch_hooks.h>
  82 #include <asm/efi.h>
  83 #include <asm/sections.h>
  84 #include <asm/dmi.h>
  85 #include <asm/io_apic.h>
  86 #include <asm/ist.h>
  87 #include <asm/vmi.h>
  88 #include <setup_arch.h>
  89 #include <asm/bios_ebda.h>
  90 #include <asm/cacheflush.h>
  91 #include <asm/processor.h>
  92 #include <asm/bugs.h>
  93
  94 #include <asm/system.h>
  95 #include <asm/vsyscall.h>
  96 #include <asm/smp.h>
  97 #include <asm/desc.h>
  98 #include <asm/dma.h>
  99 #include <asm/gart.h>
 100 #include <asm/mmu_context.h>
 101 #include <asm/proto.h>
 102
 103 #include <mach_apic.h>
 104 #include <asm/paravirt.h>
 105
 106 #include <asm/percpu.h>
 107 #include <asm/sections.h>
 108 #include <asm/topology.h>
 109 #include <asm/apicdef.h>
 110 #ifdef CONFIG_X86_64
 111 #include <asm/numa_64.h>
 112 #endif
 113
 114 #ifndef ARCH_SETUP
 115 #define ARCH_SETUP
 116 #endif
 117
 118 #ifndef CONFIG_DEBUG_BOOT_PARAMS
 119 struct boot_params __initdata boot_params;
 120 #else
 121 struct boot_params boot_params;
 122 #endif
 123
 124 /*
 125  * Machine setup..
 126  */
 127 static struct resource data_resource = {
 128         .name   = "Kernel data",
 129         .start  = 0,
 130         .end    = 0,
 131         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 132 };
 133
 134 static struct resource code_resource = {
 135         .name   = "Kernel code",
 136         .start  = 0,
 137         .end    = 0,
 138         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 139 };
 140
 141 static struct resource bss_resource = {
 142         .name   = "Kernel bss",
 143         .start  = 0,
 144         .end    = 0,
 145         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 146 };
 147
 148
 149 #ifdef CONFIG_X86_32
 150 /* This value is set up by the early boot code to point to the value
 151    immediately after the boot time page tables.  It contains a *physical*
 152    address, and must not be in the .bss segment! */
 153 unsigned long init_pg_tables_start __initdata = ~0UL;
 154 unsigned long init_pg_tables_end __initdata = ~0UL;
 155
 156 static struct resource video_ram_resource = {
 157         .name   = "Video RAM area",
 158         .start  = 0xa0000,
 159         .end    = 0xbffff,
 160         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 161 };
 162
 163 /* cpu data as detected by the assembly code in head.S */
 164 struct cpuinfo_x86 new_cpu_data __cpuinitdata = {0, 0, 0, 0, -1, 1, 0, 0, -1};
 165 /* common cpu data for all cpus */
 166 struct cpuinfo_x86 boot_cpu_data __read_mostly = {0, 0, 0, 0, -1, 1, 0, 0, -1};
 167 EXPORT_SYMBOL(boot_cpu_data);
 168 static void set_mca_bus(int x)
 169 {
 170 #ifdef CONFIG_MCA
 171         MCA_bus = x;
 172 #endif
 173 }
 174
 175 unsigned int def_to_bigsmp;
 176
 177 /* for MCA, but anyone else can use it if they want */
 178 unsigned int machine_id;
 179 unsigned int machine_submodel_id;
 180 unsigned int BIOS_revision;
 181
 182 struct apm_info apm_info;
 183 EXPORT_SYMBOL(apm_info);
 184
 185 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
 186         defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
 187 struct ist_info ist_info;
 188 EXPORT_SYMBOL(ist_info);
 189 #else
 190 struct ist_info ist_info;
 191 #endif
 192
 193 #else
 194 struct cpuinfo_x86 boot_cpu_data __read_mostly;
 195 EXPORT_SYMBOL(boot_cpu_data);
 196 #endif
 197
 198
 199 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
 200 unsigned long mmu_cr4_features;
 201 #else
 202 unsigned long mmu_cr4_features = X86_CR4_PAE;
 203 #endif
 204
 205 /* Boot loader ID as an integer, for the benefit of proc_dointvec */
 206 int bootloader_type;
 207
 208 /*
 209  * Early DMI memory
 210  */
 211 int dmi_alloc_index;
 212 char dmi_alloc_data[DMI_MAX_DATA];
 213
 214 /*
 215  * Setup options
 216  */
 217 struct screen_info screen_info;
 218 EXPORT_SYMBOL(screen_info);
 219 struct edid_info edid_info;
 220 EXPORT_SYMBOL_GPL(edid_info);
 221
 222 extern int root_mountflags;
 223
 224 unsigned long saved_video_mode;
 225
 226 #define RAMDISK_IMAGE_START_MASK        0x07FF
 227 #define RAMDISK_PROMPT_FLAG             0x8000
 228 #define RAMDISK_LOAD_FLAG               0x4000
 229
 230 static char __initdata command_line[COMMAND_LINE_SIZE];
 231
 232 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
 233 struct edd edd;
 234 #ifdef CONFIG_EDD_MODULE
 235 EXPORT_SYMBOL(edd);
 236 #endif
 237 /**
 238  * copy_edd() - Copy the BIOS EDD information
 239  *              from boot_params into a safe place.
 240  *
 241  */
 242 static inline void copy_edd(void)
 243 {
 244      memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
 245             sizeof(edd.mbr_signature));
 246      memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
 247      edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
 248      edd.edd_info_nr = boot_params.eddbuf_entries;
 249 }
 250 #else
 251 static inline void copy_edd(void)
 252 {
 253 }
 254 #endif
 255
 256 #ifdef CONFIG_BLK_DEV_INITRD
 257
 258 #ifdef CONFIG_X86_32
 259
 260 #define MAX_MAP_CHUNK   (NR_FIX_BTMAPS << PAGE_SHIFT)
 261 static void __init relocate_initrd(void)
 262 {
 263
 264         u64 ramdisk_image = boot_params.hdr.ramdisk_image;
 265         u64 ramdisk_size  = boot_params.hdr.ramdisk_size;
 266         u64 end_of_lowmem = max_low_pfn << PAGE_SHIFT;
 267         u64 ramdisk_here;
 268         unsigned long slop, clen, mapaddr;
 269         char *p, *q;
 270
 271         /* We need to move the initrd down into lowmem */
 272         ramdisk_here = find_e820_area(0, end_of_lowmem, ramdisk_size,
 273                                          PAGE_SIZE);
 274
 275         if (ramdisk_here == -1ULL)
 276                 panic("Cannot find place for new RAMDISK of size %lld\n",
 277                          ramdisk_size);
 278
 279         /* Note: this includes all the lowmem currently occupied by
 280            the initrd, we rely on that fact to keep the data intact. */
 281         reserve_early(ramdisk_here, ramdisk_here + ramdisk_size,
 282                          "NEW RAMDISK");
 283         initrd_start = ramdisk_here + PAGE_OFFSET;
 284         initrd_end   = initrd_start + ramdisk_size;
 285         printk(KERN_INFO "Allocated new RAMDISK: %08llx - %08llx\n",
 286                          ramdisk_here, ramdisk_here + ramdisk_size);
 287
 288         q = (char *)initrd_start;
 289
 290         /* Copy any lowmem portion of the initrd */
 291         if (ramdisk_image < end_of_lowmem) {
 292                 clen = end_of_lowmem - ramdisk_image;
 293                 p = (char *)__va(ramdisk_image);
 294                 memcpy(q, p, clen);
 295                 q += clen;
 296                 ramdisk_image += clen;
 297                 ramdisk_size  -= clen;
 298         }
 299
 300         /* Copy the highmem portion of the initrd */
 301         while (ramdisk_size) {
 302                 slop = ramdisk_image & ~PAGE_MASK;
 303                 clen = ramdisk_size;
 304                 if (clen > MAX_MAP_CHUNK-slop)
 305                         clen = MAX_MAP_CHUNK-slop;
 306                 mapaddr = ramdisk_image & PAGE_MASK;
 307                 p = early_ioremap(mapaddr, clen+slop);
 308                 memcpy(q, p+slop, clen);
 309                 early_iounmap(p, clen+slop);
 310                 q += clen;
 311                 ramdisk_image += clen;
 312                 ramdisk_size  -= clen;
 313         }
 314         /* high pages is not converted by early_res_to_bootmem */
 315         ramdisk_image = boot_params.hdr.ramdisk_image;
 316         ramdisk_size  = boot_params.hdr.ramdisk_size;
 317         printk(KERN_INFO "Move RAMDISK from %016llx - %016llx to"
 318                 " %08llx - %08llx\n",
 319                 ramdisk_image, ramdisk_image + ramdisk_size - 1,
 320                 ramdisk_here, ramdisk_here + ramdisk_size - 1);
 321 }
 322 #endif
 323
 324 static void __init reserve_initrd(void)
 325 {
 326         u64 ramdisk_image = boot_params.hdr.ramdisk_image;
 327         u64 ramdisk_size  = boot_params.hdr.ramdisk_size;
 328         u64 ramdisk_end   = ramdisk_image + ramdisk_size;
 329         u64 end_of_lowmem = max_low_pfn << PAGE_SHIFT;
 330
 331         if (!boot_params.hdr.type_of_loader ||
 332             !ramdisk_image || !ramdisk_size)
 333                 return;         /* No initrd provided by bootloader */
 334
 335         initrd_start = 0;
 336
 337         if (ramdisk_size >= (end_of_lowmem>>1)) {
 338                 free_early(ramdisk_image, ramdisk_end);
 339                 printk(KERN_ERR "initrd too large to handle, "
 340                        "disabling initrd\n");
 341                 return;
 342         }
 343
 344         printk(KERN_INFO "RAMDISK: %08llx - %08llx\n", ramdisk_image,
 345                         ramdisk_end);
 346
 347
 348         if (ramdisk_end <= end_of_lowmem) {
 349                 /* All in lowmem, easy case */
 350                 /*
 351                  * don't need to reserve again, already reserved early
 352                  * in i386_start_kernel
 353                  */
 354                 initrd_start = ramdisk_image + PAGE_OFFSET;
 355                 initrd_end = initrd_start + ramdisk_size;
 356                 return;
 357         }
 358
 359 #ifdef CONFIG_X86_32
 360         relocate_initrd();
 361 #else
 362         printk(KERN_ERR "initrd extends beyond end of memory "
 363                "(0x%08llx > 0x%08llx)\ndisabling initrd\n",
 364                ramdisk_end, end_of_lowmem);
 365         initrd_start = 0;
 366 #endif
 367         free_early(ramdisk_image, ramdisk_end);
 368 }
 369 #else
 370 static void __init reserve_initrd(void)
 371 {
 372 }
 373 #endif /* CONFIG_BLK_DEV_INITRD */
 374
 375 static void __init parse_setup_data(void)
 376 {
 377         struct setup_data *data;
 378         u64 pa_data;
 379
 380         if (boot_params.hdr.version < 0x0209)
 381                 return;
 382         pa_data = boot_params.hdr.setup_data;
 383         while (pa_data) {
 384                 data = early_ioremap(pa_data, PAGE_SIZE);
 385                 switch (data->type) {
 386                 case SETUP_E820_EXT:
 387                         parse_e820_ext(data, pa_data);
 388                         break;
 389                 default:
 390                         break;
 391                 }
 392                 pa_data = data->next;
 393                 early_iounmap(data, PAGE_SIZE);
 394         }
 395 }
 396
 397 static void __init reserve_setup_data(void)
 398 {
 399         struct setup_data *data;
 400         u64 pa_data;
 401         char buf[32];
 402
 403         if (boot_params.hdr.version < 0x0209)
 404                 return;
 405         pa_data = boot_params.hdr.setup_data;
 406         while (pa_data) {
 407                 data = early_ioremap(pa_data, sizeof(*data));
 408                 sprintf(buf, "setup data %x", data->type);
 409                 reserve_early(pa_data, pa_data+sizeof(*data)+data->len, buf);
 410                 e820_update_range(pa_data, sizeof(*data)+data->len,
 411                          E820_RAM, E820_RESERVED_KERN);
 412                 pa_data = data->next;
 413                 early_iounmap(data, sizeof(*data));
 414         }
 415         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 416         printk(KERN_INFO "extended physical RAM map:\n");
 417         e820_print_map("reserve setup_data");
 418 }
 419
 420 /*
 421  * --------- Crashkernel reservation ------------------------------
 422  */
 423
 424 #ifdef CONFIG_KEXEC
 425
 426 /**
 427  * Reserve @size bytes of crashkernel memory at any suitable offset.
 428  *
 429  * @size: Size of the crashkernel memory to reserve.
 430  * Returns the base address on success, and -1ULL on failure.
 431  */
 432 unsigned long long find_and_reserve_crashkernel(unsigned long long size)
 433 {
 434         const unsigned long long alignment = 16<<20;    /* 16M */
 435         unsigned long long start = 0LL;
 436
 437         while (1) {
 438                 int ret;
 439
 440                 start = find_e820_area(start, ULONG_MAX, size, alignment);
 441                 if (start == -1ULL)
 442                         return start;
 443
 444                 /* try to reserve it */
 445                 ret = reserve_bootmem_generic(start, size, BOOTMEM_EXCLUSIVE);
 446                 if (ret >= 0)
 447                         return start;
 448
 449                 start += alignment;
 450         }
 451 }
 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 static void __init reserve_crashkernel(void)
 466 {
 467         unsigned long long total_mem;
 468         unsigned long long crash_size, crash_base;
 469         int ret;
 470
 471         total_mem = get_total_mem();
 472
 473         ret = parse_crashkernel(boot_command_line, total_mem,
 474                         &crash_size, &crash_base);
 475         if (ret != 0 || crash_size <= 0)
 476                 return;
 477
 478         /* 0 means: find the address automatically */
 479         if (crash_base <= 0) {
 480                 crash_base = find_and_reserve_crashkernel(crash_size);
 481                 if (crash_base == -1ULL) {
 482                         pr_info("crashkernel reservation failed. "
 483                                 "No suitable area found.\n");
 484                         return;
 485                 }
 486         } else {
 487                 ret = reserve_bootmem_generic(crash_base, crash_size,
 488                                         BOOTMEM_EXCLUSIVE);
 489                 if (ret < 0) {
 490                         pr_info("crashkernel reservation failed - "
 491                                 "memory is in use\n");
 492                         return;
 493                 }
 494         }
 495
 496         printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
 497                         "for crashkernel (System RAM: %ldMB)\n",
 498                         (unsigned long)(crash_size >> 20),
 499                         (unsigned long)(crash_base >> 20),
 500                         (unsigned long)(total_mem >> 20));
 501
 502         crashk_res.start = crash_base;
 503         crashk_res.end   = crash_base + crash_size - 1;
 504         insert_resource(&iomem_resource, &crashk_res);
 505 }
 506 #else
 507 static void __init reserve_crashkernel(void)
 508 {
 509 }
 510 #endif
 511
 512 static struct resource standard_io_resources[] = {
 513         { .name = "dma1", .start = 0x00, .end = 0x1f,
 514                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 515         { .name = "pic1", .start = 0x20, .end = 0x21,
 516                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 517         { .name = "timer0", .start = 0x40, .end = 0x43,
 518                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 519         { .name = "timer1", .start = 0x50, .end = 0x53,
 520                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 521         { .name = "keyboard", .start = 0x60, .end = 0x60,
 522                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 523         { .name = "keyboard", .start = 0x64, .end = 0x64,
 524                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 525         { .name = "dma page reg", .start = 0x80, .end = 0x8f,
 526                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 527         { .name = "pic2", .start = 0xa0, .end = 0xa1,
 528                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 529         { .name = "dma2", .start = 0xc0, .end = 0xdf,
 530                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 531         { .name = "fpu", .start = 0xf0, .end = 0xff,
 532                 .flags = IORESOURCE_BUSY | IORESOURCE_IO }
 533 };
 534
 535 static void __init reserve_standard_io_resources(void)
 536 {
 537         int i;
 538
 539         /* request I/O space for devices used on all i[345]86 PCs */
 540         for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
 541                 request_resource(&ioport_resource, &standard_io_resources[i]);
 542
 543 }
 544
 545 #ifdef CONFIG_PROC_VMCORE
 546 /* elfcorehdr= specifies the location of elf core header
 547  * stored by the crashed kernel. This option will be passed
 548  * by kexec loader to the capture kernel.
 549  */
 550 static int __init setup_elfcorehdr(char *arg)
 551 {
 552         char *end;
 553         if (!arg)
 554                 return -EINVAL;
 555         elfcorehdr_addr = memparse(arg, &end);
 556         return end > arg ? 0 : -EINVAL;
 557 }
 558 early_param("elfcorehdr", setup_elfcorehdr);
 559 #endif
 560
 561 /*
 562  * Determine if we were loaded by an EFI loader.  If so, then we have also been
 563  * passed the efi memmap, systab, etc., so we should use these data structures
 564  * for initialization.  Note, the efi init code path is determined by the
 565  * global efi_enabled. This allows the same kernel image to be used on existing
 566  * systems (with a traditional BIOS) as well as on EFI systems.
 567  */
 568 /*
 569  * setup_arch - architecture-specific boot-time initializations
 570  *
 571  * Note: On x86_64, fixmaps are ready for use even before this is called.
 572  */
 573
 574 void __init setup_arch(char **cmdline_p)
 575 {
 576 #ifdef CONFIG_X86_32
 577         memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
 578         pre_setup_arch_hook();
 579         early_cpu_init();
 580 #else
 581         printk(KERN_INFO "Command line: %s\n", boot_command_line);
 582 #endif
 583
 584         early_ioremap_init();
 585
 586         ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
 587         screen_info = boot_params.screen_info;
 588         edid_info = boot_params.edid_info;
 589 #ifdef CONFIG_X86_32
 590         apm_info.bios = boot_params.apm_bios_info;
 591         ist_info = boot_params.ist_info;
 592         if (boot_params.sys_desc_table.length != 0) {
 593                 set_mca_bus(boot_params.sys_desc_table.table[3] & 0x2);
 594                 machine_id = boot_params.sys_desc_table.table[0];
 595                 machine_submodel_id = boot_params.sys_desc_table.table[1];
 596                 BIOS_revision = boot_params.sys_desc_table.table[2];
 597         }
 598 #endif
 599         saved_video_mode = boot_params.hdr.vid_mode;
 600         bootloader_type = boot_params.hdr.type_of_loader;
 601
 602 #ifdef CONFIG_BLK_DEV_RAM
 603         rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
 604         rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
 605         rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
 606 #endif
 607 #ifdef CONFIG_EFI
 608         if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
 609 #ifdef CONFIG_X86_32
 610                      "EL32",
 611 #else
 612                      "EL64",
 613 #endif
 614          4)) {
 615                 efi_enabled = 1;
 616                 efi_reserve_early();
 617         }
 618 #endif
 619
 620         ARCH_SETUP
 621
 622         setup_memory_map();
 623         parse_setup_data();
 624
 625         copy_edd();
 626
 627         if (!boot_params.hdr.root_flags)
 628                 root_mountflags &= ~MS_RDONLY;
 629         init_mm.start_code = (unsigned long) _text;
 630         init_mm.end_code = (unsigned long) _etext;
 631         init_mm.end_data = (unsigned long) _edata;
 632 #ifdef CONFIG_X86_32
 633         init_mm.brk = init_pg_tables_end + PAGE_OFFSET;
 634 #else
 635         init_mm.brk = (unsigned long) &_end;
 636 #endif
 637
 638         code_resource.start = virt_to_phys(_text);
 639         code_resource.end = virt_to_phys(_etext)-1;
 640         data_resource.start = virt_to_phys(_etext);
 641         data_resource.end = virt_to_phys(_edata)-1;
 642         bss_resource.start = virt_to_phys(&__bss_start);
 643         bss_resource.end = virt_to_phys(&__bss_stop)-1;
 644
 645 #ifdef CONFIG_X86_64
 646         early_cpu_init();
 647 #endif
 648         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 649         *cmdline_p = command_line;
 650
 651         parse_early_param();
 652
 653         /* after early param, so could get panic from serial */
 654         reserve_setup_data();
 655
 656         if (acpi_mps_check()) {
 657 #ifdef CONFIG_X86_LOCAL_APIC
 658                 disable_apic = 1;
 659 #endif
 660                 clear_cpu_cap(&boot_cpu_data, X86_FEATURE_APIC);
 661         }
 662
 663         finish_e820_parsing();
 664
 665 #ifdef CONFIG_X86_32
 666         probe_roms();
 667 #endif
 668
 669         /* after parse_early_param, so could debug it */
 670         insert_resource(&iomem_resource, &code_resource);
 671         insert_resource(&iomem_resource, &data_resource);
 672         insert_resource(&iomem_resource, &bss_resource);
 673
 674         if (efi_enabled)
 675                 efi_init();
 676
 677 #ifdef CONFIG_X86_32
 678         if (ppro_with_ram_bug()) {
 679                 e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM,
 680                                   E820_RESERVED);
 681                 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 682                 printk(KERN_INFO "fixed physical RAM map:\n");
 683                 e820_print_map("bad_ppro");
 684         }
 685 #else
 686         early_gart_iommu_check();
 687 #endif
 688
 689         e820_register_active_regions(0, 0, -1UL);
 690         /*
 691          * partially used pages are not usable - thus
 692          * we are rounding upwards:
 693          */
 694         max_pfn = e820_end_of_ram();
 695
 696         /* preallocate 4k for mptable mpc */
 697         early_reserve_e820_mpc_new();
 698         /* update e820 for memory not covered by WB MTRRs */
 699         mtrr_bp_init();
 700         if (mtrr_trim_uncached_memory(max_pfn)) {
 701                 remove_all_active_ranges();
 702                 e820_register_active_regions(0, 0, -1UL);
 703                 max_pfn = e820_end_of_ram();
 704         }
 705
 706 #ifdef CONFIG_X86_32
 707         /* max_low_pfn get updated here */
 708         find_low_pfn_range();
 709 #else
 710         num_physpages = max_pfn;
 711
 712         check_efer();
 713
 714         /* How many end-of-memory variables you have, grandma! */
 715         /* need this before calling reserve_initrd */
 716         max_low_pfn = max_pfn;
 717         high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
 718 #endif
 719
 720         /* max_pfn_mapped is updated here */
 721         max_pfn_mapped = init_memory_mapping(0, (max_low_pfn << PAGE_SHIFT));
 722
 723         /*
 724          * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
 725          */
 726
 727 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
 728         if (init_ohci1394_dma_early)
 729                 init_ohci1394_dma_on_all_controllers();
 730 #endif
 731
 732         reserve_initrd();
 733
 734 #ifdef CONFIG_X86_64
 735         vsmp_init();
 736 #endif
 737
 738         dmi_scan_machine();
 739
 740         io_delay_init();
 741
 742         /*
 743          * Parse the ACPI tables for possible boot-time SMP configuration.
 744          */
 745         acpi_boot_table_init();
 746
 747 #ifdef CONFIG_X86_64
 748         /* Remove active ranges so rediscovery with NUMA-awareness happens */
 749         remove_all_active_ranges();
 750 #endif
 751
 752 #ifdef CONFIG_ACPI_NUMA
 753         /*
 754          * Parse SRAT to discover nodes.
 755          */
 756         acpi_numa_init();
 757 #endif
 758
 759         initmem_init(0, max_pfn);
 760
 761 #ifdef CONFIG_X86_64
 762         dma32_reserve_bootmem();
 763 #endif
 764
 765 #ifdef CONFIG_ACPI_SLEEP
 766         /*
 767          * Reserve low memory region for sleep support.
 768          */
 769         acpi_reserve_bootmem();
 770 #endif
 771 #ifdef CONFIG_X86_FIND_SMP_CONFIG
 772         /*
 773          * Find and reserve possible boot-time SMP configuration:
 774          */
 775         find_smp_config();
 776 #endif
 777         reserve_crashkernel();
 778
 779         reserve_ibft_region();
 780
 781 #ifdef CONFIG_KVM_CLOCK
 782         kvmclock_init();
 783 #endif
 784
 785 #if defined(CONFIG_VMI) && defined(CONFIG_X86_32)
 786         /*
 787          * Must be after max_low_pfn is determined, and before kernel
 788          * pagetables are setup.
 789          */
 790         vmi_init();
 791 #endif
 792
 793         paging_init();
 794
 795 #ifdef CONFIG_X86_64
 796         map_vsyscall();
 797 #endif
 798
 799 #ifdef CONFIG_X86_GENERICARCH
 800         generic_apic_probe();
 801 #endif
 802
 803         early_quirks();
 804
 805         /*
 806          * Read APIC and some other early information from ACPI tables.
 807          */
 808         acpi_boot_init();
 809
 810 #ifdef CONFIG_X86_64
 811         init_cpu_to_node();
 812 #endif
 813
 814 #if defined(CONFIG_X86_MPPARSE) || defined(CONFIG_X86_VISWS)
 815         /*
 816          * get boot-time SMP configuration:
 817          */
 818         if (smp_found_config)
 819                 get_smp_config();
 820 #endif
 821
 822         init_apic_mappings();
 823         ioapic_init_mappings();
 824
 825 #if defined(CONFIG_SMP) && defined(CONFIG_X86_PC) && defined(CONFIG_X86_32)
 826         if (def_to_bigsmp)
 827                 printk(KERN_WARNING "More than 8 CPUs detected and "
 828                         "CONFIG_X86_PC cannot handle it.\nUse "
 829                         "CONFIG_X86_GENERICARCH or CONFIG_X86_BIGSMP.\n");
 830 #endif
 831         kvm_guest_init();
 832
 833         e820_reserve_resources();
 834         e820_mark_nosave_regions(max_low_pfn);
 835
 836 #ifdef CONFIG_X86_32
 837         request_resource(&iomem_resource, &video_ram_resource);
 838 #endif
 839         reserve_standard_io_resources();
 840
 841         e820_setup_gap();
 842
 843 #ifdef CONFIG_VT
 844 #if defined(CONFIG_VGA_CONSOLE)
 845         if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
 846                 conswitchp = &vga_con;
 847 #elif defined(CONFIG_DUMMY_CONSOLE)
 848         conswitchp = &dummy_con;
 849 #endif
 850 #endif
 851 }