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 <asm/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/cpu.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 <asm/genapic.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 #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_memremap(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_memremap(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 e820_reserve_setup_data(void)
 398 {
 399         struct setup_data *data;
 400         u64 pa_data;
 401         int found = 0;
 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_memremap(pa_data, sizeof(*data));
 408                 e820_update_range(pa_data, sizeof(*data)+data->len,
 409                          E820_RAM, E820_RESERVED_KERN);
 410                 found = 1;
 411                 pa_data = data->next;
 412                 early_iounmap(data, sizeof(*data));
 413         }
 414         if (!found)
 415                 return;
 416
 417         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 418         memcpy(&e820_saved, &e820, sizeof(struct e820map));
 419         printk(KERN_INFO "extended physical RAM map:\n");
 420         e820_print_map("reserve setup_data");
 421 }
 422
 423 static void __init reserve_early_setup_data(void)
 424 {
 425         struct setup_data *data;
 426         u64 pa_data;
 427         char buf[32];
 428
 429         if (boot_params.hdr.version < 0x0209)
 430                 return;
 431         pa_data = boot_params.hdr.setup_data;
 432         while (pa_data) {
 433                 data = early_memremap(pa_data, sizeof(*data));
 434                 sprintf(buf, "setup data %x", data->type);
 435                 reserve_early(pa_data, pa_data+sizeof(*data)+data->len, buf);
 436                 pa_data = data->next;
 437                 early_iounmap(data, sizeof(*data));
 438         }
 439 }
 440
 441 /*
 442  * --------- Crashkernel reservation ------------------------------
 443  */
 444
 445 #ifdef CONFIG_KEXEC
 446
 447 /**
 448  * Reserve @size bytes of crashkernel memory at any suitable offset.
 449  *
 450  * @size: Size of the crashkernel memory to reserve.
 451  * Returns the base address on success, and -1ULL on failure.
 452  */
 453 static
 454 unsigned long long __init find_and_reserve_crashkernel(unsigned long long size)
 455 {
 456         const unsigned long long alignment = 16<<20;    /* 16M */
 457         unsigned long long start = 0LL;
 458
 459         while (1) {
 460                 int ret;
 461
 462                 start = find_e820_area(start, ULONG_MAX, size, alignment);
 463                 if (start == -1ULL)
 464                         return start;
 465
 466                 /* try to reserve it */
 467                 ret = reserve_bootmem_generic(start, size, BOOTMEM_EXCLUSIVE);
 468                 if (ret >= 0)
 469                         return start;
 470
 471                 start += alignment;
 472         }
 473 }
 474
 475 static inline unsigned long long get_total_mem(void)
 476 {
 477         unsigned long long total;
 478
 479         total = max_low_pfn - min_low_pfn;
 480 #ifdef CONFIG_HIGHMEM
 481         total += highend_pfn - highstart_pfn;
 482 #endif
 483
 484         return total << PAGE_SHIFT;
 485 }
 486
 487 static void __init reserve_crashkernel(void)
 488 {
 489         unsigned long long total_mem;
 490         unsigned long long crash_size, crash_base;
 491         int ret;
 492
 493         total_mem = get_total_mem();
 494
 495         ret = parse_crashkernel(boot_command_line, total_mem,
 496                         &crash_size, &crash_base);
 497         if (ret != 0 || crash_size <= 0)
 498                 return;
 499
 500         /* 0 means: find the address automatically */
 501         if (crash_base <= 0) {
 502                 crash_base = find_and_reserve_crashkernel(crash_size);
 503                 if (crash_base == -1ULL) {
 504                         pr_info("crashkernel reservation failed. "
 505                                 "No suitable area found.\n");
 506                         return;
 507                 }
 508         } else {
 509                 ret = reserve_bootmem_generic(crash_base, crash_size,
 510                                         BOOTMEM_EXCLUSIVE);
 511                 if (ret < 0) {
 512                         pr_info("crashkernel reservation failed - "
 513                                 "memory is in use\n");
 514                         return;
 515                 }
 516         }
 517
 518         printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
 519                         "for crashkernel (System RAM: %ldMB)\n",
 520                         (unsigned long)(crash_size >> 20),
 521                         (unsigned long)(crash_base >> 20),
 522                         (unsigned long)(total_mem >> 20));
 523
 524         crashk_res.start = crash_base;
 525         crashk_res.end   = crash_base + crash_size - 1;
 526         insert_resource(&iomem_resource, &crashk_res);
 527 }
 528 #else
 529 static void __init reserve_crashkernel(void)
 530 {
 531 }
 532 #endif
 533
 534 static struct resource standard_io_resources[] = {
 535         { .name = "dma1", .start = 0x00, .end = 0x1f,
 536                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 537         { .name = "pic1", .start = 0x20, .end = 0x21,
 538                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 539         { .name = "timer0", .start = 0x40, .end = 0x43,
 540                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 541         { .name = "timer1", .start = 0x50, .end = 0x53,
 542                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 543         { .name = "keyboard", .start = 0x60, .end = 0x60,
 544                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 545         { .name = "keyboard", .start = 0x64, .end = 0x64,
 546                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 547         { .name = "dma page reg", .start = 0x80, .end = 0x8f,
 548                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 549         { .name = "pic2", .start = 0xa0, .end = 0xa1,
 550                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 551         { .name = "dma2", .start = 0xc0, .end = 0xdf,
 552                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 553         { .name = "fpu", .start = 0xf0, .end = 0xff,
 554                 .flags = IORESOURCE_BUSY | IORESOURCE_IO }
 555 };
 556
 557 static void __init reserve_standard_io_resources(void)
 558 {
 559         int i;
 560
 561         /* request I/O space for devices used on all i[345]86 PCs */
 562         for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
 563                 request_resource(&ioport_resource, &standard_io_resources[i]);
 564
 565 }
 566
 567 /*
 568  * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
 569  * is_kdump_kernel() to determine if we are booting after a panic. Hence
 570  * ifdef it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
 571  */
 572
 573 #ifdef CONFIG_CRASH_DUMP
 574 /* elfcorehdr= specifies the location of elf core header
 575  * stored by the crashed kernel. This option will be passed
 576  * by kexec loader to the capture kernel.
 577  */
 578 static int __init setup_elfcorehdr(char *arg)
 579 {
 580         char *end;
 581         if (!arg)
 582                 return -EINVAL;
 583         elfcorehdr_addr = memparse(arg, &end);
 584         return end > arg ? 0 : -EINVAL;
 585 }
 586 early_param("elfcorehdr", setup_elfcorehdr);
 587 #endif
 588
 589 static int __init default_update_genapic(void)
 590 {
 591 #ifdef CONFIG_SMP
 592         if (!apic->wakeup_cpu)
 593                 apic->wakeup_cpu = wakeup_secondary_cpu_via_init;
 594 #endif
 595
 596         return 0;
 597 }
 598
 599 static struct x86_quirks default_x86_quirks __initdata = {
 600         .update_genapic         = default_update_genapic,
 601 };
 602
 603 struct x86_quirks *x86_quirks __initdata = &default_x86_quirks;
 604
 605 #ifdef CONFIG_X86_RESERVE_LOW_64K
 606 static int __init dmi_low_memory_corruption(const struct dmi_system_id *d)
 607 {
 608         printk(KERN_NOTICE
 609                 "%s detected: BIOS may corrupt low RAM, working it around.\n",
 610                 d->ident);
 611
 612         e820_update_range(0, 0x10000, E820_RAM, E820_RESERVED);
 613         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 614
 615         return 0;
 616 }
 617 #endif
 618
 619 /* List of systems that have known low memory corruption BIOS problems */
 620 static struct dmi_system_id __initdata bad_bios_dmi_table[] = {
 621 #ifdef CONFIG_X86_RESERVE_LOW_64K
 622         {
 623                 .callback = dmi_low_memory_corruption,
 624                 .ident = "AMI BIOS",
 625                 .matches = {
 626                         DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
 627                 },
 628         },
 629         {
 630                 .callback = dmi_low_memory_corruption,
 631                 .ident = "Phoenix BIOS",
 632                 .matches = {
 633                         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies"),
 634                 },
 635         },
 636 #endif
 637         {}
 638 };
 639
 640 /*
 641  * Determine if we were loaded by an EFI loader.  If so, then we have also been
 642  * passed the efi memmap, systab, etc., so we should use these data structures
 643  * for initialization.  Note, the efi init code path is determined by the
 644  * global efi_enabled. This allows the same kernel image to be used on existing
 645  * systems (with a traditional BIOS) as well as on EFI systems.
 646  */
 647 /*
 648  * setup_arch - architecture-specific boot-time initializations
 649  *
 650  * Note: On x86_64, fixmaps are ready for use even before this is called.
 651  */
 652
 653 void __init setup_arch(char **cmdline_p)
 654 {
 655 #ifdef CONFIG_X86_32
 656         memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
 657         visws_early_detect();
 658         pre_setup_arch_hook();
 659 #else
 660         printk(KERN_INFO "Command line: %s\n", boot_command_line);
 661 #endif
 662
 663         /* VMI may relocate the fixmap; do this before touching ioremap area */
 664         vmi_init();
 665
 666         early_cpu_init();
 667         early_ioremap_init();
 668
 669         ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
 670         screen_info = boot_params.screen_info;
 671         edid_info = boot_params.edid_info;
 672 #ifdef CONFIG_X86_32
 673         apm_info.bios = boot_params.apm_bios_info;
 674         ist_info = boot_params.ist_info;
 675         if (boot_params.sys_desc_table.length != 0) {
 676                 set_mca_bus(boot_params.sys_desc_table.table[3] & 0x2);
 677                 machine_id = boot_params.sys_desc_table.table[0];
 678                 machine_submodel_id = boot_params.sys_desc_table.table[1];
 679                 BIOS_revision = boot_params.sys_desc_table.table[2];
 680         }
 681 #endif
 682         saved_video_mode = boot_params.hdr.vid_mode;
 683         bootloader_type = boot_params.hdr.type_of_loader;
 684
 685 #ifdef CONFIG_BLK_DEV_RAM
 686         rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
 687         rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
 688         rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
 689 #endif
 690 #ifdef CONFIG_EFI
 691         if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
 692 #ifdef CONFIG_X86_32
 693                      "EL32",
 694 #else
 695                      "EL64",
 696 #endif
 697          4)) {
 698                 efi_enabled = 1;
 699                 efi_reserve_early();
 700         }
 701 #endif
 702
 703         ARCH_SETUP
 704
 705         setup_memory_map();
 706         parse_setup_data();
 707         /* update the e820_saved too */
 708         e820_reserve_setup_data();
 709
 710         copy_edd();
 711
 712         if (!boot_params.hdr.root_flags)
 713                 root_mountflags &= ~MS_RDONLY;
 714         init_mm.start_code = (unsigned long) _text;
 715         init_mm.end_code = (unsigned long) _etext;
 716         init_mm.end_data = (unsigned long) _edata;
 717 #ifdef CONFIG_X86_32
 718         init_mm.brk = init_pg_tables_end + PAGE_OFFSET;
 719 #else
 720         init_mm.brk = (unsigned long) &_end;
 721 #endif
 722
 723         code_resource.start = virt_to_phys(_text);
 724         code_resource.end = virt_to_phys(_etext)-1;
 725         data_resource.start = virt_to_phys(_etext);
 726         data_resource.end = virt_to_phys(_edata)-1;
 727         bss_resource.start = virt_to_phys(&__bss_start);
 728         bss_resource.end = virt_to_phys(&__bss_stop)-1;
 729
 730 #ifdef CONFIG_CMDLINE_BOOL
 731 #ifdef CONFIG_CMDLINE_OVERRIDE
 732         strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 733 #else
 734         if (builtin_cmdline[0]) {
 735                 /* append boot loader cmdline to builtin */
 736                 strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE);
 737                 strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE);
 738                 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 739         }
 740 #endif
 741 #endif
 742
 743         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 744         *cmdline_p = command_line;
 745
 746         parse_early_param();
 747
 748 #ifdef CONFIG_X86_64
 749         check_efer();
 750 #endif
 751
 752         /* Must be before kernel pagetables are setup */
 753         vmi_activate();
 754
 755         /* after early param, so could get panic from serial */
 756         reserve_early_setup_data();
 757
 758         if (acpi_mps_check()) {
 759 #ifdef CONFIG_X86_LOCAL_APIC
 760                 disable_apic = 1;
 761 #endif
 762                 setup_clear_cpu_cap(X86_FEATURE_APIC);
 763         }
 764
 765 #ifdef CONFIG_PCI
 766         if (pci_early_dump_regs)
 767                 early_dump_pci_devices();
 768 #endif
 769
 770         finish_e820_parsing();
 771
 772         dmi_scan_machine();
 773
 774         dmi_check_system(bad_bios_dmi_table);
 775
 776         /*
 777          * VMware detection requires dmi to be available, so this
 778          * needs to be done after dmi_scan_machine, for the BP.
 779          */
 780         init_hypervisor(&boot_cpu_data);
 781
 782 #ifdef CONFIG_X86_32
 783         probe_roms();
 784 #endif
 785
 786         /* after parse_early_param, so could debug it */
 787         insert_resource(&iomem_resource, &code_resource);
 788         insert_resource(&iomem_resource, &data_resource);
 789         insert_resource(&iomem_resource, &bss_resource);
 790
 791         if (efi_enabled)
 792                 efi_init();
 793
 794 #ifdef CONFIG_X86_32
 795         if (ppro_with_ram_bug()) {
 796                 e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM,
 797                                   E820_RESERVED);
 798                 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 799                 printk(KERN_INFO "fixed physical RAM map:\n");
 800                 e820_print_map("bad_ppro");
 801         }
 802 #else
 803         early_gart_iommu_check();
 804 #endif
 805
 806         /*
 807          * partially used pages are not usable - thus
 808          * we are rounding upwards:
 809          */
 810         max_pfn = e820_end_of_ram_pfn();
 811
 812         /* preallocate 4k for mptable mpc */
 813         early_reserve_e820_mpc_new();
 814         /* update e820 for memory not covered by WB MTRRs */
 815         mtrr_bp_init();
 816         if (mtrr_trim_uncached_memory(max_pfn))
 817                 max_pfn = e820_end_of_ram_pfn();
 818
 819 #ifdef CONFIG_X86_32
 820         /* max_low_pfn get updated here */
 821         find_low_pfn_range();
 822 #else
 823         num_physpages = max_pfn;
 824
 825         if (cpu_has_x2apic)
 826                 check_x2apic();
 827
 828         /* How many end-of-memory variables you have, grandma! */
 829         /* need this before calling reserve_initrd */
 830         if (max_pfn > (1UL<<(32 - PAGE_SHIFT)))
 831                 max_low_pfn = e820_end_of_low_ram_pfn();
 832         else
 833                 max_low_pfn = max_pfn;
 834
 835         high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
 836 #endif
 837
 838 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
 839         setup_bios_corruption_check();
 840 #endif
 841
 842         /* max_pfn_mapped is updated here */
 843         max_low_pfn_mapped = init_memory_mapping(0, max_low_pfn<<PAGE_SHIFT);
 844         max_pfn_mapped = max_low_pfn_mapped;
 845
 846 #ifdef CONFIG_X86_64
 847         if (max_pfn > max_low_pfn) {
 848                 max_pfn_mapped = init_memory_mapping(1UL<<32,
 849                                                      max_pfn<<PAGE_SHIFT);
 850                 /* can we preseve max_low_pfn ?*/
 851                 max_low_pfn = max_pfn;
 852         }
 853 #endif
 854
 855         /*
 856          * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
 857          */
 858
 859 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
 860         if (init_ohci1394_dma_early)
 861                 init_ohci1394_dma_on_all_controllers();
 862 #endif
 863
 864         reserve_initrd();
 865
 866 #ifdef CONFIG_X86_64
 867         vsmp_init();
 868 #endif
 869
 870         io_delay_init();
 871
 872         /*
 873          * Parse the ACPI tables for possible boot-time SMP configuration.
 874          */
 875         acpi_boot_table_init();
 876
 877         early_acpi_boot_init();
 878
 879 #ifdef CONFIG_ACPI_NUMA
 880         /*
 881          * Parse SRAT to discover nodes.
 882          */
 883         acpi_numa_init();
 884 #endif
 885
 886         initmem_init(0, max_pfn);
 887
 888 #ifdef CONFIG_ACPI_SLEEP
 889         /*
 890          * Reserve low memory region for sleep support.
 891          */
 892         acpi_reserve_bootmem();
 893 #endif
 894 #ifdef CONFIG_X86_FIND_SMP_CONFIG
 895         /*
 896          * Find and reserve possible boot-time SMP configuration:
 897          */
 898         find_smp_config();
 899 #endif
 900         reserve_crashkernel();
 901
 902 #ifdef CONFIG_X86_64
 903         /*
 904          * dma32_reserve_bootmem() allocates bootmem which may conflict
 905          * with the crashkernel command line, so do that after
 906          * reserve_crashkernel()
 907          */
 908         dma32_reserve_bootmem();
 909 #endif
 910
 911         reserve_ibft_region();
 912
 913 #ifdef CONFIG_KVM_CLOCK
 914         kvmclock_init();
 915 #endif
 916
 917         paravirt_pagetable_setup_start(swapper_pg_dir);
 918         paging_init();
 919         paravirt_pagetable_setup_done(swapper_pg_dir);
 920         paravirt_post_allocator_init();
 921
 922 #ifdef CONFIG_X86_64
 923         map_vsyscall();
 924 #endif
 925
 926 #ifdef CONFIG_X86_GENERICARCH
 927         generic_apic_probe();
 928 #endif
 929
 930         early_quirks();
 931
 932         /*
 933          * Read APIC and some other early information from ACPI tables.
 934          */
 935         acpi_boot_init();
 936
 937 #if defined(CONFIG_X86_MPPARSE) || defined(CONFIG_X86_VISWS)
 938         /*
 939          * get boot-time SMP configuration:
 940          */
 941         if (smp_found_config)
 942                 get_smp_config();
 943 #endif
 944
 945         prefill_possible_map();
 946
 947 #ifdef CONFIG_X86_64
 948         init_cpu_to_node();
 949 #endif
 950
 951         init_apic_mappings();
 952         ioapic_init_mappings();
 953
 954         /* need to wait for io_apic is mapped */
 955         probe_nr_irqs_gsi();
 956
 957         kvm_guest_init();
 958
 959         e820_reserve_resources();
 960         e820_mark_nosave_regions(max_low_pfn);
 961
 962 #ifdef CONFIG_X86_32
 963         request_resource(&iomem_resource, &video_ram_resource);
 964 #endif
 965         reserve_standard_io_resources();
 966
 967         e820_setup_gap();
 968
 969 #ifdef CONFIG_VT
 970 #if defined(CONFIG_VGA_CONSOLE)
 971         if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
 972                 conswitchp = &vga_con;
 973 #elif defined(CONFIG_DUMMY_CONSOLE)
 974         conswitchp = &dummy_con;
 975 #endif
 976 #endif
 977 }
 978
 979