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
  61 #include <linux/kallsyms.h>
  62 #include <linux/cpufreq.h>
  63 #include <linux/dma-mapping.h>
  64 #include <linux/ctype.h>
  65 #include <linux/uaccess.h>
  66
  67 #include <linux/percpu.h>
  68 #include <linux/crash_dump.h>
  69
  70 #include <video/edid.h>
  71
  72 #include <asm/mtrr.h>
  73 #include <asm/apic.h>
  74 #include <asm/e820.h>
  75 #include <asm/mpspec.h>
  76 #include <asm/setup.h>
  77 #include <asm/arch_hooks.h>
  78 #include <asm/efi.h>
  79 #include <asm/sections.h>
  80 #include <asm/dmi.h>
  81 #include <asm/io_apic.h>
  82 #include <asm/ist.h>
  83 #include <asm/vmi.h>
  84 #include <setup_arch.h>
  85 #include <asm/bios_ebda.h>
  86 #include <asm/cacheflush.h>
  87 #include <asm/processor.h>
  88 #include <asm/bugs.h>
  89
  90 #include <asm/system.h>
  91 #include <asm/vsyscall.h>
  92 #include <asm/smp.h>
  93 #include <asm/desc.h>
  94 #include <asm/dma.h>
  95 #include <asm/iommu.h>
  96 #include <asm/gart.h>
  97 #include <asm/mmu_context.h>
  98 #include <asm/proto.h>
  99
 100 #include <mach_apic.h>
 101 #include <asm/paravirt.h>
 102 #include <asm/hypervisor.h>
 103
 104 #include <asm/percpu.h>
 105 #include <asm/topology.h>
 106 #include <asm/apicdef.h>
 107 #ifdef CONFIG_X86_64
 108 #include <asm/numa_64.h>
 109 #endif
 110
 111 #ifndef ARCH_SETUP
 112 #define ARCH_SETUP
 113 #endif
 114
 115 #ifndef CONFIG_DEBUG_BOOT_PARAMS
 116 struct boot_params __initdata boot_params;
 117 #else
 118 struct boot_params boot_params;
 119 #endif
 120
 121 /*
 122  * Machine setup..
 123  */
 124 static struct resource data_resource = {
 125         .name   = "Kernel data",
 126         .start  = 0,
 127         .end    = 0,
 128         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 129 };
 130
 131 static struct resource code_resource = {
 132         .name   = "Kernel code",
 133         .start  = 0,
 134         .end    = 0,
 135         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 136 };
 137
 138 static struct resource bss_resource = {
 139         .name   = "Kernel bss",
 140         .start  = 0,
 141         .end    = 0,
 142         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 143 };
 144
 145
 146 #ifdef CONFIG_X86_32
 147 /* This value is set up by the early boot code to point to the value
 148    immediately after the boot time page tables.  It contains a *physical*
 149    address, and must not be in the .bss segment! */
 150 unsigned long init_pg_tables_start __initdata = ~0UL;
 151 unsigned long init_pg_tables_end __initdata = ~0UL;
 152
 153 static struct resource video_ram_resource = {
 154         .name   = "Video RAM area",
 155         .start  = 0xa0000,
 156         .end    = 0xbffff,
 157         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 158 };
 159
 160 /* cpu data as detected by the assembly code in head.S */
 161 struct cpuinfo_x86 new_cpu_data __cpuinitdata = {0, 0, 0, 0, -1, 1, 0, 0, -1};
 162 /* common cpu data for all cpus */
 163 struct cpuinfo_x86 boot_cpu_data __read_mostly = {0, 0, 0, 0, -1, 1, 0, 0, -1};
 164 EXPORT_SYMBOL(boot_cpu_data);
 165 static void set_mca_bus(int x)
 166 {
 167 #ifdef CONFIG_MCA
 168         MCA_bus = x;
 169 #endif
 170 }
 171
 172 unsigned int def_to_bigsmp;
 173
 174 /* for MCA, but anyone else can use it if they want */
 175 unsigned int machine_id;
 176 unsigned int machine_submodel_id;
 177 unsigned int BIOS_revision;
 178
 179 struct apm_info apm_info;
 180 EXPORT_SYMBOL(apm_info);
 181
 182 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
 183         defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
 184 struct ist_info ist_info;
 185 EXPORT_SYMBOL(ist_info);
 186 #else
 187 struct ist_info ist_info;
 188 #endif
 189
 190 #else
 191 struct cpuinfo_x86 boot_cpu_data __read_mostly;
 192 EXPORT_SYMBOL(boot_cpu_data);
 193 #endif
 194
 195
 196 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
 197 unsigned long mmu_cr4_features;
 198 #else
 199 unsigned long mmu_cr4_features = X86_CR4_PAE;
 200 #endif
 201
 202 /* Boot loader ID as an integer, for the benefit of proc_dointvec */
 203 int bootloader_type;
 204
 205 /*
 206  * Early DMI memory
 207  */
 208 int dmi_alloc_index;
 209 char dmi_alloc_data[DMI_MAX_DATA];
 210
 211 /*
 212  * Setup options
 213  */
 214 struct screen_info screen_info;
 215 EXPORT_SYMBOL(screen_info);
 216 struct edid_info edid_info;
 217 EXPORT_SYMBOL_GPL(edid_info);
 218
 219 extern int root_mountflags;
 220
 221 unsigned long saved_video_mode;
 222
 223 #define RAMDISK_IMAGE_START_MASK        0x07FF
 224 #define RAMDISK_PROMPT_FLAG             0x8000
 225 #define RAMDISK_LOAD_FLAG               0x4000
 226
 227 static char __initdata command_line[COMMAND_LINE_SIZE];
 228 #ifdef CONFIG_CMDLINE_BOOL
 229 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
 230 #endif
 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 #define MAX_MAP_CHUNK   (NR_FIX_BTMAPS << PAGE_SHIFT)
 259 static void __init relocate_initrd(void)
 260 {
 261
 262         u64 ramdisk_image = boot_params.hdr.ramdisk_image;
 263         u64 ramdisk_size  = boot_params.hdr.ramdisk_size;
 264         u64 end_of_lowmem = max_low_pfn_mapped << PAGE_SHIFT;
 265         u64 ramdisk_here;
 266         unsigned long slop, clen, mapaddr;
 267         char *p, *q;
 268
 269         /* We need to move the initrd down into lowmem */
 270         ramdisk_here = find_e820_area(0, end_of_lowmem, ramdisk_size,
 271                                          PAGE_SIZE);
 272
 273         if (ramdisk_here == -1ULL)
 274                 panic("Cannot find place for new RAMDISK of size %lld\n",
 275                          ramdisk_size);
 276
 277         /* Note: this includes all the lowmem currently occupied by
 278            the initrd, we rely on that fact to keep the data intact. */
 279         reserve_early(ramdisk_here, ramdisk_here + ramdisk_size,
 280                          "NEW RAMDISK");
 281         initrd_start = ramdisk_here + PAGE_OFFSET;
 282         initrd_end   = initrd_start + ramdisk_size;
 283         printk(KERN_INFO "Allocated new RAMDISK: %08llx - %08llx\n",
 284                          ramdisk_here, ramdisk_here + ramdisk_size);
 285
 286         q = (char *)initrd_start;
 287
 288         /* Copy any lowmem portion of the initrd */
 289         if (ramdisk_image < end_of_lowmem) {
 290                 clen = end_of_lowmem - ramdisk_image;
 291                 p = (char *)__va(ramdisk_image);
 292                 memcpy(q, p, clen);
 293                 q += clen;
 294                 ramdisk_image += clen;
 295                 ramdisk_size  -= clen;
 296         }
 297
 298         /* Copy the highmem portion of the initrd */
 299         while (ramdisk_size) {
 300                 slop = ramdisk_image & ~PAGE_MASK;
 301                 clen = ramdisk_size;
 302                 if (clen > MAX_MAP_CHUNK-slop)
 303                         clen = MAX_MAP_CHUNK-slop;
 304                 mapaddr = ramdisk_image & PAGE_MASK;
 305                 p = early_memremap(mapaddr, clen+slop);
 306                 memcpy(q, p+slop, clen);
 307                 early_iounmap(p, clen+slop);
 308                 q += clen;
 309                 ramdisk_image += clen;
 310                 ramdisk_size  -= clen;
 311         }
 312         /* high pages is not converted by early_res_to_bootmem */
 313         ramdisk_image = boot_params.hdr.ramdisk_image;
 314         ramdisk_size  = boot_params.hdr.ramdisk_size;
 315         printk(KERN_INFO "Move RAMDISK from %016llx - %016llx to"
 316                 " %08llx - %08llx\n",
 317                 ramdisk_image, ramdisk_image + ramdisk_size - 1,
 318                 ramdisk_here, ramdisk_here + ramdisk_size - 1);
 319 }
 320
 321 static void __init reserve_initrd(void)
 322 {
 323         u64 ramdisk_image = boot_params.hdr.ramdisk_image;
 324         u64 ramdisk_size  = boot_params.hdr.ramdisk_size;
 325         u64 ramdisk_end   = ramdisk_image + ramdisk_size;
 326         u64 end_of_lowmem = max_low_pfn_mapped << PAGE_SHIFT;
 327
 328         if (!boot_params.hdr.type_of_loader ||
 329             !ramdisk_image || !ramdisk_size)
 330                 return;         /* No initrd provided by bootloader */
 331
 332         initrd_start = 0;
 333
 334         if (ramdisk_size >= (end_of_lowmem>>1)) {
 335                 free_early(ramdisk_image, ramdisk_end);
 336                 printk(KERN_ERR "initrd too large to handle, "
 337                        "disabling initrd\n");
 338                 return;
 339         }
 340
 341         printk(KERN_INFO "RAMDISK: %08llx - %08llx\n", ramdisk_image,
 342                         ramdisk_end);
 343
 344
 345         if (ramdisk_end <= end_of_lowmem) {
 346                 /* All in lowmem, easy case */
 347                 /*
 348                  * don't need to reserve again, already reserved early
 349                  * in i386_start_kernel
 350                  */
 351                 initrd_start = ramdisk_image + PAGE_OFFSET;
 352                 initrd_end = initrd_start + ramdisk_size;
 353                 return;
 354         }
 355
 356         relocate_initrd();
 357
 358         free_early(ramdisk_image, ramdisk_end);
 359 }
 360 #else
 361 static void __init reserve_initrd(void)
 362 {
 363 }
 364 #endif /* CONFIG_BLK_DEV_INITRD */
 365
 366 static void __init parse_setup_data(void)
 367 {
 368         struct setup_data *data;
 369         u64 pa_data;
 370
 371         if (boot_params.hdr.version < 0x0209)
 372                 return;
 373         pa_data = boot_params.hdr.setup_data;
 374         while (pa_data) {
 375                 data = early_memremap(pa_data, PAGE_SIZE);
 376                 switch (data->type) {
 377                 case SETUP_E820_EXT:
 378                         parse_e820_ext(data, pa_data);
 379                         break;
 380                 default:
 381                         break;
 382                 }
 383                 pa_data = data->next;
 384                 early_iounmap(data, PAGE_SIZE);
 385         }
 386 }
 387
 388 static void __init e820_reserve_setup_data(void)
 389 {
 390         struct setup_data *data;
 391         u64 pa_data;
 392         int found = 0;
 393
 394         if (boot_params.hdr.version < 0x0209)
 395                 return;
 396         pa_data = boot_params.hdr.setup_data;
 397         while (pa_data) {
 398                 data = early_memremap(pa_data, sizeof(*data));
 399                 e820_update_range(pa_data, sizeof(*data)+data->len,
 400                          E820_RAM, E820_RESERVED_KERN);
 401                 found = 1;
 402                 pa_data = data->next;
 403                 early_iounmap(data, sizeof(*data));
 404         }
 405         if (!found)
 406                 return;
 407
 408         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 409         memcpy(&e820_saved, &e820, sizeof(struct e820map));
 410         printk(KERN_INFO "extended physical RAM map:\n");
 411         e820_print_map("reserve setup_data");
 412 }
 413
 414 static void __init reserve_early_setup_data(void)
 415 {
 416         struct setup_data *data;
 417         u64 pa_data;
 418         char buf[32];
 419
 420         if (boot_params.hdr.version < 0x0209)
 421                 return;
 422         pa_data = boot_params.hdr.setup_data;
 423         while (pa_data) {
 424                 data = early_memremap(pa_data, sizeof(*data));
 425                 sprintf(buf, "setup data %x", data->type);
 426                 reserve_early(pa_data, pa_data+sizeof(*data)+data->len, buf);
 427                 pa_data = data->next;
 428                 early_iounmap(data, sizeof(*data));
 429         }
 430 }
 431
 432 /*
 433  * --------- Crashkernel reservation ------------------------------
 434  */
 435
 436 #ifdef CONFIG_KEXEC
 437
 438 /**
 439  * Reserve @size bytes of crashkernel memory at any suitable offset.
 440  *
 441  * @size: Size of the crashkernel memory to reserve.
 442  * Returns the base address on success, and -1ULL on failure.
 443  */
 444 static
 445 unsigned long long __init find_and_reserve_crashkernel(unsigned long long size)
 446 {
 447         const unsigned long long alignment = 16<<20;    /* 16M */
 448         unsigned long long start = 0LL;
 449
 450         while (1) {
 451                 int ret;
 452
 453                 start = find_e820_area(start, ULONG_MAX, size, alignment);
 454                 if (start == -1ULL)
 455                         return start;
 456
 457                 /* try to reserve it */
 458                 ret = reserve_bootmem_generic(start, size, BOOTMEM_EXCLUSIVE);
 459                 if (ret >= 0)
 460                         return start;
 461
 462                 start += alignment;
 463         }
 464 }
 465
 466 static inline unsigned long long get_total_mem(void)
 467 {
 468         unsigned long long total;
 469
 470         total = max_low_pfn - min_low_pfn;
 471 #ifdef CONFIG_HIGHMEM
 472         total += highend_pfn - highstart_pfn;
 473 #endif
 474
 475         return total << PAGE_SHIFT;
 476 }
 477
 478 static void __init reserve_crashkernel(void)
 479 {
 480         unsigned long long total_mem;
 481         unsigned long long crash_size, crash_base;
 482         int ret;
 483
 484         total_mem = get_total_mem();
 485
 486         ret = parse_crashkernel(boot_command_line, total_mem,
 487                         &crash_size, &crash_base);
 488         if (ret != 0 || crash_size <= 0)
 489                 return;
 490
 491         /* 0 means: find the address automatically */
 492         if (crash_base <= 0) {
 493                 crash_base = find_and_reserve_crashkernel(crash_size);
 494                 if (crash_base == -1ULL) {
 495                         pr_info("crashkernel reservation failed. "
 496                                 "No suitable area found.\n");
 497                         return;
 498                 }
 499         } else {
 500                 ret = reserve_bootmem_generic(crash_base, crash_size,
 501                                         BOOTMEM_EXCLUSIVE);
 502                 if (ret < 0) {
 503                         pr_info("crashkernel reservation failed - "
 504                                 "memory is in use\n");
 505                         return;
 506                 }
 507         }
 508
 509         printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
 510                         "for crashkernel (System RAM: %ldMB)\n",
 511                         (unsigned long)(crash_size >> 20),
 512                         (unsigned long)(crash_base >> 20),
 513                         (unsigned long)(total_mem >> 20));
 514
 515         crashk_res.start = crash_base;
 516         crashk_res.end   = crash_base + crash_size - 1;
 517         insert_resource(&iomem_resource, &crashk_res);
 518 }
 519 #else
 520 static void __init reserve_crashkernel(void)
 521 {
 522 }
 523 #endif
 524
 525 static struct resource standard_io_resources[] = {
 526         { .name = "dma1", .start = 0x00, .end = 0x1f,
 527                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 528         { .name = "pic1", .start = 0x20, .end = 0x21,
 529                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 530         { .name = "timer0", .start = 0x40, .end = 0x43,
 531                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 532         { .name = "timer1", .start = 0x50, .end = 0x53,
 533                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 534         { .name = "keyboard", .start = 0x60, .end = 0x60,
 535                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 536         { .name = "keyboard", .start = 0x64, .end = 0x64,
 537                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 538         { .name = "dma page reg", .start = 0x80, .end = 0x8f,
 539                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 540         { .name = "pic2", .start = 0xa0, .end = 0xa1,
 541                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 542         { .name = "dma2", .start = 0xc0, .end = 0xdf,
 543                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 544         { .name = "fpu", .start = 0xf0, .end = 0xff,
 545                 .flags = IORESOURCE_BUSY | IORESOURCE_IO }
 546 };
 547
 548 static void __init reserve_standard_io_resources(void)
 549 {
 550         int i;
 551
 552         /* request I/O space for devices used on all i[345]86 PCs */
 553         for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
 554                 request_resource(&ioport_resource, &standard_io_resources[i]);
 555
 556 }
 557
 558 /*
 559  * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
 560  * is_kdump_kernel() to determine if we are booting after a panic. Hence
 561  * ifdef it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
 562  */
 563
 564 #ifdef CONFIG_CRASH_DUMP
 565 /* elfcorehdr= specifies the location of elf core header
 566  * stored by the crashed kernel. This option will be passed
 567  * by kexec loader to the capture kernel.
 568  */
 569 static int __init setup_elfcorehdr(char *arg)
 570 {
 571         char *end;
 572         if (!arg)
 573                 return -EINVAL;
 574         elfcorehdr_addr = memparse(arg, &end);
 575         return end > arg ? 0 : -EINVAL;
 576 }
 577 early_param("elfcorehdr", setup_elfcorehdr);
 578 #endif
 579
 580 static int __init default_update_genapic(void)
 581 {
 582 #ifdef CONFIG_X86_SMP
 583 # if defined(CONFIG_X86_GENERICARCH) || defined(CONFIG_X86_64)
 584         genapic->wakeup_cpu = wakeup_secondary_cpu_via_init;
 585 # endif
 586 #endif
 587
 588         return 0;
 589 }
 590
 591 static struct x86_quirks default_x86_quirks __initdata = {
 592         .update_genapic         = default_update_genapic,
 593 };
 594
 595 struct x86_quirks *x86_quirks __initdata = &default_x86_quirks;
 596
 597 #ifdef CONFIG_X86_RESERVE_LOW_64K
 598 static int __init dmi_low_memory_corruption(const struct dmi_system_id *d)
 599 {
 600         printk(KERN_NOTICE
 601                 "%s detected: BIOS may corrupt low RAM, working around it.\n",
 602                 d->ident);
 603
 604         e820_update_range(0, 0x10000, E820_RAM, E820_RESERVED);
 605         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 606
 607         return 0;
 608 }
 609 #endif
 610
 611 /* List of systems that have known low memory corruption BIOS problems */
 612 static struct dmi_system_id __initdata bad_bios_dmi_table[] = {
 613 #ifdef CONFIG_X86_RESERVE_LOW_64K
 614         {
 615                 .callback = dmi_low_memory_corruption,
 616                 .ident = "AMI BIOS",
 617                 .matches = {
 618                         DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
 619                 },
 620         },
 621         {
 622                 .callback = dmi_low_memory_corruption,
 623                 .ident = "Phoenix BIOS",
 624                 .matches = {
 625                         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies"),
 626                 },
 627         },
 628 #endif
 629         {}
 630 };
 631
 632 /*
 633  * Determine if we were loaded by an EFI loader.  If so, then we have also been
 634  * passed the efi memmap, systab, etc., so we should use these data structures
 635  * for initialization.  Note, the efi init code path is determined by the
 636  * global efi_enabled. This allows the same kernel image to be used on existing
 637  * systems (with a traditional BIOS) as well as on EFI systems.
 638  */
 639 /*
 640  * setup_arch - architecture-specific boot-time initializations
 641  *
 642  * Note: On x86_64, fixmaps are ready for use even before this is called.
 643  */
 644
 645 void __init setup_arch(char **cmdline_p)
 646 {
 647 #ifdef CONFIG_X86_32
 648         memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
 649         visws_early_detect();
 650         pre_setup_arch_hook();
 651 #else
 652         printk(KERN_INFO "Command line: %s\n", boot_command_line);
 653 #endif
 654
 655         /* VMI may relocate the fixmap; do this before touching ioremap area */
 656         vmi_init();
 657
 658         early_cpu_init();
 659         early_ioremap_init();
 660
 661         ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
 662         screen_info = boot_params.screen_info;
 663         edid_info = boot_params.edid_info;
 664 #ifdef CONFIG_X86_32
 665         apm_info.bios = boot_params.apm_bios_info;
 666         ist_info = boot_params.ist_info;
 667         if (boot_params.sys_desc_table.length != 0) {
 668                 set_mca_bus(boot_params.sys_desc_table.table[3] & 0x2);
 669                 machine_id = boot_params.sys_desc_table.table[0];
 670                 machine_submodel_id = boot_params.sys_desc_table.table[1];
 671                 BIOS_revision = boot_params.sys_desc_table.table[2];
 672         }
 673 #endif
 674         saved_video_mode = boot_params.hdr.vid_mode;
 675         bootloader_type = boot_params.hdr.type_of_loader;
 676
 677 #ifdef CONFIG_BLK_DEV_RAM
 678         rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
 679         rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
 680         rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
 681 #endif
 682 #ifdef CONFIG_EFI
 683         if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
 684 #ifdef CONFIG_X86_32
 685                      "EL32",
 686 #else
 687                      "EL64",
 688 #endif
 689          4)) {
 690                 efi_enabled = 1;
 691                 efi_reserve_early();
 692         }
 693 #endif
 694
 695         ARCH_SETUP
 696
 697         setup_memory_map();
 698         parse_setup_data();
 699         /* update the e820_saved too */
 700         e820_reserve_setup_data();
 701
 702         copy_edd();
 703
 704         if (!boot_params.hdr.root_flags)
 705                 root_mountflags &= ~MS_RDONLY;
 706         init_mm.start_code = (unsigned long) _text;
 707         init_mm.end_code = (unsigned long) _etext;
 708         init_mm.end_data = (unsigned long) _edata;
 709 #ifdef CONFIG_X86_32
 710         init_mm.brk = init_pg_tables_end + PAGE_OFFSET;
 711 #else
 712         init_mm.brk = (unsigned long) &_end;
 713 #endif
 714
 715         code_resource.start = virt_to_phys(_text);
 716         code_resource.end = virt_to_phys(_etext)-1;
 717         data_resource.start = virt_to_phys(_etext);
 718         data_resource.end = virt_to_phys(_edata)-1;
 719         bss_resource.start = virt_to_phys(&__bss_start);
 720         bss_resource.end = virt_to_phys(&__bss_stop)-1;
 721
 722 #ifdef CONFIG_CMDLINE_BOOL
 723 #ifdef CONFIG_CMDLINE_OVERRIDE
 724         strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 725 #else
 726         if (builtin_cmdline[0]) {
 727                 /* append boot loader cmdline to builtin */
 728                 strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE);
 729                 strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE);
 730                 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 731         }
 732 #endif
 733 #endif
 734
 735         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 736         *cmdline_p = command_line;
 737
 738         parse_early_param();
 739
 740 #ifdef CONFIG_X86_64
 741         check_efer();
 742 #endif
 743
 744         /* Must be before kernel pagetables are setup */
 745         vmi_activate();
 746
 747         /* after early param, so could get panic from serial */
 748         reserve_early_setup_data();
 749
 750         if (acpi_mps_check()) {
 751 #ifdef CONFIG_X86_LOCAL_APIC
 752                 disable_apic = 1;
 753 #endif
 754                 setup_clear_cpu_cap(X86_FEATURE_APIC);
 755         }
 756
 757 #ifdef CONFIG_PCI
 758         if (pci_early_dump_regs)
 759                 early_dump_pci_devices();
 760 #endif
 761
 762         finish_e820_parsing();
 763
 764         if (efi_enabled)
 765                 efi_init();
 766
 767         dmi_scan_machine();
 768
 769         dmi_check_system(bad_bios_dmi_table);
 770
 771         /*
 772          * VMware detection requires dmi to be available, so this
 773          * needs to be done after dmi_scan_machine, for the BP.
 774          */
 775         init_hypervisor(&boot_cpu_data);
 776
 777 #ifdef CONFIG_X86_32
 778         probe_roms();
 779 #endif
 780
 781         /* after parse_early_param, so could debug it */
 782         insert_resource(&iomem_resource, &code_resource);
 783         insert_resource(&iomem_resource, &data_resource);
 784         insert_resource(&iomem_resource, &bss_resource);
 785
 786
 787 #ifdef CONFIG_X86_32
 788         if (ppro_with_ram_bug()) {
 789                 e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM,
 790                                   E820_RESERVED);
 791                 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 792                 printk(KERN_INFO "fixed physical RAM map:\n");
 793                 e820_print_map("bad_ppro");
 794         }
 795 #else
 796         early_gart_iommu_check();
 797 #endif
 798
 799         /*
 800          * partially used pages are not usable - thus
 801          * we are rounding upwards:
 802          */
 803         max_pfn = e820_end_of_ram_pfn();
 804
 805         /* preallocate 4k for mptable mpc */
 806         early_reserve_e820_mpc_new();
 807         /* update e820 for memory not covered by WB MTRRs */
 808         mtrr_bp_init();
 809         if (mtrr_trim_uncached_memory(max_pfn))
 810                 max_pfn = e820_end_of_ram_pfn();
 811
 812 #ifdef CONFIG_X86_32
 813         /* max_low_pfn get updated here */
 814         find_low_pfn_range();
 815 #else
 816         num_physpages = max_pfn;
 817
 818         if (cpu_has_x2apic)
 819                 check_x2apic();
 820
 821         /* How many end-of-memory variables you have, grandma! */
 822         /* need this before calling reserve_initrd */
 823         if (max_pfn > (1UL<<(32 - PAGE_SHIFT)))
 824                 max_low_pfn = e820_end_of_low_ram_pfn();
 825         else
 826                 max_low_pfn = max_pfn;
 827
 828         high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
 829 #endif
 830
 831 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
 832         setup_bios_corruption_check();
 833 #endif
 834
 835         /* max_pfn_mapped is updated here */
 836         max_low_pfn_mapped = init_memory_mapping(0, max_low_pfn<<PAGE_SHIFT);
 837         max_pfn_mapped = max_low_pfn_mapped;
 838
 839 #ifdef CONFIG_X86_64
 840         if (max_pfn > max_low_pfn) {
 841                 max_pfn_mapped = init_memory_mapping(1UL<<32,
 842                                                      max_pfn<<PAGE_SHIFT);
 843                 /* can we preseve max_low_pfn ?*/
 844                 max_low_pfn = max_pfn;
 845         }
 846 #endif
 847
 848         /*
 849          * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
 850          */
 851
 852 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
 853         if (init_ohci1394_dma_early)
 854                 init_ohci1394_dma_on_all_controllers();
 855 #endif
 856
 857         reserve_initrd();
 858
 859 #ifdef CONFIG_X86_64
 860         vsmp_init();
 861 #endif
 862
 863         io_delay_init();
 864
 865         /*
 866          * Parse the ACPI tables for possible boot-time SMP configuration.
 867          */
 868         acpi_boot_table_init();
 869
 870         early_acpi_boot_init();
 871
 872 #ifdef CONFIG_ACPI_NUMA
 873         /*
 874          * Parse SRAT to discover nodes.
 875          */
 876         acpi_numa_init();
 877 #endif
 878
 879         initmem_init(0, max_pfn);
 880
 881 #ifdef CONFIG_ACPI_SLEEP
 882         /*
 883          * Reserve low memory region for sleep support.
 884          */
 885         acpi_reserve_bootmem();
 886 #endif
 887 #ifdef CONFIG_X86_FIND_SMP_CONFIG
 888         /*
 889          * Find and reserve possible boot-time SMP configuration:
 890          */
 891         find_smp_config();
 892 #endif
 893         reserve_crashkernel();
 894
 895 #ifdef CONFIG_X86_64
 896         /*
 897          * dma32_reserve_bootmem() allocates bootmem which may conflict
 898          * with the crashkernel command line, so do that after
 899          * reserve_crashkernel()
 900          */
 901         dma32_reserve_bootmem();
 902 #endif
 903
 904         reserve_ibft_region();
 905
 906 #ifdef CONFIG_KVM_CLOCK
 907         kvmclock_init();
 908 #endif
 909
 910         paravirt_pagetable_setup_start(swapper_pg_dir);
 911         paging_init();
 912         paravirt_pagetable_setup_done(swapper_pg_dir);
 913         paravirt_post_allocator_init();
 914
 915 #ifdef CONFIG_X86_64
 916         map_vsyscall();
 917 #endif
 918
 919 #ifdef CONFIG_X86_GENERICARCH
 920         generic_apic_probe();
 921 #endif
 922
 923         early_quirks();
 924
 925         /*
 926          * Read APIC and some other early information from ACPI tables.
 927          */
 928         acpi_boot_init();
 929
 930 #if defined(CONFIG_X86_MPPARSE) || defined(CONFIG_X86_VISWS)
 931         /*
 932          * get boot-time SMP configuration:
 933          */
 934         if (smp_found_config)
 935                 get_smp_config();
 936 #endif
 937
 938         prefill_possible_map();
 939
 940 #ifdef CONFIG_X86_64
 941         init_cpu_to_node();
 942 #endif
 943
 944         init_apic_mappings();
 945         ioapic_init_mappings();
 946
 947         /* need to wait for io_apic is mapped */
 948         probe_nr_irqs_gsi();
 949
 950         kvm_guest_init();
 951
 952         e820_reserve_resources();
 953         e820_mark_nosave_regions(max_low_pfn);
 954
 955 #ifdef CONFIG_X86_32
 956         request_resource(&iomem_resource, &video_ram_resource);
 957 #endif
 958         reserve_standard_io_resources();
 959
 960         e820_setup_gap();
 961
 962 #ifdef CONFIG_VT
 963 #if defined(CONFIG_VGA_CONSOLE)
 964         if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
 965                 conswitchp = &vga_con;
 966 #elif defined(CONFIG_DUMMY_CONSOLE)
 967         conswitchp = &dummy_con;
 968 #endif
 969 #endif
 970 }
 971
 972