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 #include <linux/tboot.h>
  70
  71 #include <video/edid.h>
  72
  73 #include <asm/mtrr.h>
  74 #include <asm/apic.h>
  75 #include <asm/e820.h>
  76 #include <asm/mpspec.h>
  77 #include <asm/setup.h>
  78 #include <asm/efi.h>
  79 #include <asm/timer.h>
  80 #include <asm/i8259.h>
  81 #include <asm/sections.h>
  82 #include <asm/dmi.h>
  83 #include <asm/io_apic.h>
  84 #include <asm/ist.h>
  85 #include <asm/vmi.h>
  86 #include <asm/setup_arch.h>
  87 #include <asm/bios_ebda.h>
  88 #include <asm/cacheflush.h>
  89 #include <asm/processor.h>
  90 #include <asm/bugs.h>
  91
  92 #include <asm/system.h>
  93 #include <asm/vsyscall.h>
  94 #include <asm/cpu.h>
  95 #include <asm/desc.h>
  96 #include <asm/dma.h>
  97 #include <asm/iommu.h>
  98 #include <asm/gart.h>
  99 #include <asm/mmu_context.h>
 100 #include <asm/proto.h>
 101
 102 #include <asm/paravirt.h>
 103 #include <asm/hypervisor.h>
 104
 105 #include <asm/percpu.h>
 106 #include <asm/topology.h>
 107 #include <asm/apicdef.h>
 108 #ifdef CONFIG_X86_64
 109 #include <asm/numa_64.h>
 110 #endif
 111
 112 #ifndef ARCH_SETUP
 113 #define ARCH_SETUP
 114 #endif
 115
 116 /*
 117  * end_pfn only includes RAM, while max_pfn_mapped includes all e820 entries.
 118  * The direct mapping extends to max_pfn_mapped, so that we can directly access
 119  * apertures, ACPI and other tables without having to play with fixmaps.
 120  */
 121 unsigned long max_low_pfn_mapped;
 122 unsigned long max_pfn_mapped;
 123
 124 RESERVE_BRK(dmi_alloc, 65536);
 125
 126 unsigned int boot_cpu_id __read_mostly;
 127
 128 static __initdata unsigned long _brk_start = (unsigned long)__brk_base;
 129 unsigned long _brk_end = (unsigned long)__brk_base;
 130
 131 #ifdef CONFIG_X86_64
 132 int default_cpu_present_to_apicid(int mps_cpu)
 133 {
 134         return __default_cpu_present_to_apicid(mps_cpu);
 135 }
 136
 137 int default_check_phys_apicid_present(int boot_cpu_physical_apicid)
 138 {
 139         return __default_check_phys_apicid_present(boot_cpu_physical_apicid);
 140 }
 141 #endif
 142
 143 #ifndef CONFIG_DEBUG_BOOT_PARAMS
 144 struct boot_params __initdata boot_params;
 145 #else
 146 struct boot_params boot_params;
 147 #endif
 148
 149 /*
 150  * Machine setup..
 151  */
 152 static struct resource data_resource = {
 153         .name   = "Kernel data",
 154         .start  = 0,
 155         .end    = 0,
 156         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 157 };
 158
 159 static struct resource code_resource = {
 160         .name   = "Kernel code",
 161         .start  = 0,
 162         .end    = 0,
 163         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 164 };
 165
 166 static struct resource bss_resource = {
 167         .name   = "Kernel bss",
 168         .start  = 0,
 169         .end    = 0,
 170         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 171 };
 172
 173
 174 #ifdef CONFIG_X86_32
 175 static struct resource video_ram_resource = {
 176         .name   = "Video RAM area",
 177         .start  = 0xa0000,
 178         .end    = 0xbffff,
 179         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 180 };
 181
 182 /* cpu data as detected by the assembly code in head.S */
 183 struct cpuinfo_x86 new_cpu_data __cpuinitdata = {0, 0, 0, 0, -1, 1, 0, 0, -1};
 184 /* common cpu data for all cpus */
 185 struct cpuinfo_x86 boot_cpu_data __read_mostly = {0, 0, 0, 0, -1, 1, 0, 0, -1};
 186 EXPORT_SYMBOL(boot_cpu_data);
 187 static void set_mca_bus(int x)
 188 {
 189 #ifdef CONFIG_MCA
 190         MCA_bus = x;
 191 #endif
 192 }
 193
 194 unsigned int def_to_bigsmp;
 195
 196 /* for MCA, but anyone else can use it if they want */
 197 unsigned int machine_id;
 198 unsigned int machine_submodel_id;
 199 unsigned int BIOS_revision;
 200
 201 struct apm_info apm_info;
 202 EXPORT_SYMBOL(apm_info);
 203
 204 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
 205         defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
 206 struct ist_info ist_info;
 207 EXPORT_SYMBOL(ist_info);
 208 #else
 209 struct ist_info ist_info;
 210 #endif
 211
 212 #else
 213 struct cpuinfo_x86 boot_cpu_data __read_mostly = {
 214         .x86_phys_bits = MAX_PHYSMEM_BITS,
 215 };
 216 EXPORT_SYMBOL(boot_cpu_data);
 217 #endif
 218
 219
 220 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
 221 unsigned long mmu_cr4_features;
 222 #else
 223 unsigned long mmu_cr4_features = X86_CR4_PAE;
 224 #endif
 225
 226 /* Boot loader ID and version as integers, for the benefit of proc_dointvec */
 227 int bootloader_type, bootloader_version;
 228
 229 /*
 230  * Setup options
 231  */
 232 struct screen_info screen_info;
 233 EXPORT_SYMBOL(screen_info);
 234 struct edid_info edid_info;
 235 EXPORT_SYMBOL_GPL(edid_info);
 236
 237 extern int root_mountflags;
 238
 239 unsigned long saved_video_mode;
 240
 241 #define RAMDISK_IMAGE_START_MASK        0x07FF
 242 #define RAMDISK_PROMPT_FLAG             0x8000
 243 #define RAMDISK_LOAD_FLAG               0x4000
 244
 245 static char __initdata command_line[COMMAND_LINE_SIZE];
 246 #ifdef CONFIG_CMDLINE_BOOL
 247 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
 248 #endif
 249
 250 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
 251 struct edd edd;
 252 #ifdef CONFIG_EDD_MODULE
 253 EXPORT_SYMBOL(edd);
 254 #endif
 255 /**
 256  * copy_edd() - Copy the BIOS EDD information
 257  *              from boot_params into a safe place.
 258  *
 259  */
 260 static inline void copy_edd(void)
 261 {
 262      memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
 263             sizeof(edd.mbr_signature));
 264      memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
 265      edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
 266      edd.edd_info_nr = boot_params.eddbuf_entries;
 267 }
 268 #else
 269 static inline void copy_edd(void)
 270 {
 271 }
 272 #endif
 273
 274 void * __init extend_brk(size_t size, size_t align)
 275 {
 276         size_t mask = align - 1;
 277         void *ret;
 278
 279         BUG_ON(_brk_start == 0);
 280         BUG_ON(align & mask);
 281
 282         _brk_end = (_brk_end + mask) & ~mask;
 283         BUG_ON((char *)(_brk_end + size) > __brk_limit);
 284
 285         ret = (void *)_brk_end;
 286         _brk_end += size;
 287
 288         memset(ret, 0, size);
 289
 290         return ret;
 291 }
 292
 293 #ifdef CONFIG_X86_64
 294 static void __init init_gbpages(void)
 295 {
 296         if (direct_gbpages && cpu_has_gbpages)
 297                 printk(KERN_INFO "Using GB pages for direct mapping\n");
 298         else
 299                 direct_gbpages = 0;
 300 }
 301 #else
 302 static inline void init_gbpages(void)
 303 {
 304 }
 305 #endif
 306
 307 static void __init reserve_brk(void)
 308 {
 309         if (_brk_end > _brk_start)
 310                 reserve_early(__pa(_brk_start), __pa(_brk_end), "BRK");
 311
 312         /* Mark brk area as locked down and no longer taking any
 313            new allocations */
 314         _brk_start = 0;
 315 }
 316
 317 #ifdef CONFIG_BLK_DEV_INITRD
 318
 319 #define MAX_MAP_CHUNK   (NR_FIX_BTMAPS << PAGE_SHIFT)
 320 static void __init relocate_initrd(void)
 321 {
 322
 323         u64 ramdisk_image = boot_params.hdr.ramdisk_image;
 324         u64 ramdisk_size  = boot_params.hdr.ramdisk_size;
 325         u64 end_of_lowmem = max_low_pfn_mapped << PAGE_SHIFT;
 326         u64 ramdisk_here;
 327         unsigned long slop, clen, mapaddr;
 328         char *p, *q;
 329
 330         /* We need to move the initrd down into lowmem */
 331         ramdisk_here = find_e820_area(0, end_of_lowmem, ramdisk_size,
 332                                          PAGE_SIZE);
 333
 334         if (ramdisk_here == -1ULL)
 335                 panic("Cannot find place for new RAMDISK of size %lld\n",
 336                          ramdisk_size);
 337
 338         /* Note: this includes all the lowmem currently occupied by
 339            the initrd, we rely on that fact to keep the data intact. */
 340         reserve_early(ramdisk_here, ramdisk_here + ramdisk_size,
 341                          "NEW RAMDISK");
 342         initrd_start = ramdisk_here + PAGE_OFFSET;
 343         initrd_end   = initrd_start + ramdisk_size;
 344         printk(KERN_INFO "Allocated new RAMDISK: %08llx - %08llx\n",
 345                          ramdisk_here, ramdisk_here + ramdisk_size);
 346
 347         q = (char *)initrd_start;
 348
 349         /* Copy any lowmem portion of the initrd */
 350         if (ramdisk_image < end_of_lowmem) {
 351                 clen = end_of_lowmem - ramdisk_image;
 352                 p = (char *)__va(ramdisk_image);
 353                 memcpy(q, p, clen);
 354                 q += clen;
 355                 ramdisk_image += clen;
 356                 ramdisk_size  -= clen;
 357         }
 358
 359         /* Copy the highmem portion of the initrd */
 360         while (ramdisk_size) {
 361                 slop = ramdisk_image & ~PAGE_MASK;
 362                 clen = ramdisk_size;
 363                 if (clen > MAX_MAP_CHUNK-slop)
 364                         clen = MAX_MAP_CHUNK-slop;
 365                 mapaddr = ramdisk_image & PAGE_MASK;
 366                 p = early_memremap(mapaddr, clen+slop);
 367                 memcpy(q, p+slop, clen);
 368                 early_iounmap(p, clen+slop);
 369                 q += clen;
 370                 ramdisk_image += clen;
 371                 ramdisk_size  -= clen;
 372         }
 373         /* high pages is not converted by early_res_to_bootmem */
 374         ramdisk_image = boot_params.hdr.ramdisk_image;
 375         ramdisk_size  = boot_params.hdr.ramdisk_size;
 376         printk(KERN_INFO "Move RAMDISK from %016llx - %016llx to"
 377                 " %08llx - %08llx\n",
 378                 ramdisk_image, ramdisk_image + ramdisk_size - 1,
 379                 ramdisk_here, ramdisk_here + ramdisk_size - 1);
 380 }
 381
 382 static void __init reserve_initrd(void)
 383 {
 384         u64 ramdisk_image = boot_params.hdr.ramdisk_image;
 385         u64 ramdisk_size  = boot_params.hdr.ramdisk_size;
 386         u64 ramdisk_end   = ramdisk_image + ramdisk_size;
 387         u64 end_of_lowmem = max_low_pfn_mapped << PAGE_SHIFT;
 388
 389         if (!boot_params.hdr.type_of_loader ||
 390             !ramdisk_image || !ramdisk_size)
 391                 return;         /* No initrd provided by bootloader */
 392
 393         initrd_start = 0;
 394
 395         if (ramdisk_size >= (end_of_lowmem>>1)) {
 396                 free_early(ramdisk_image, ramdisk_end);
 397                 printk(KERN_ERR "initrd too large to handle, "
 398                        "disabling initrd\n");
 399                 return;
 400         }
 401
 402         printk(KERN_INFO "RAMDISK: %08llx - %08llx\n", ramdisk_image,
 403                         ramdisk_end);
 404
 405
 406         if (ramdisk_end <= end_of_lowmem) {
 407                 /* All in lowmem, easy case */
 408                 /*
 409                  * don't need to reserve again, already reserved early
 410                  * in i386_start_kernel
 411                  */
 412                 initrd_start = ramdisk_image + PAGE_OFFSET;
 413                 initrd_end = initrd_start + ramdisk_size;
 414                 return;
 415         }
 416
 417         relocate_initrd();
 418
 419         free_early(ramdisk_image, ramdisk_end);
 420 }
 421 #else
 422 static void __init reserve_initrd(void)
 423 {
 424 }
 425 #endif /* CONFIG_BLK_DEV_INITRD */
 426
 427 static void __init parse_setup_data(void)
 428 {
 429         struct setup_data *data;
 430         u64 pa_data;
 431
 432         if (boot_params.hdr.version < 0x0209)
 433                 return;
 434         pa_data = boot_params.hdr.setup_data;
 435         while (pa_data) {
 436                 data = early_memremap(pa_data, PAGE_SIZE);
 437                 switch (data->type) {
 438                 case SETUP_E820_EXT:
 439                         parse_e820_ext(data, pa_data);
 440                         break;
 441                 default:
 442                         break;
 443                 }
 444                 pa_data = data->next;
 445                 early_iounmap(data, PAGE_SIZE);
 446         }
 447 }
 448
 449 static void __init e820_reserve_setup_data(void)
 450 {
 451         struct setup_data *data;
 452         u64 pa_data;
 453         int found = 0;
 454
 455         if (boot_params.hdr.version < 0x0209)
 456                 return;
 457         pa_data = boot_params.hdr.setup_data;
 458         while (pa_data) {
 459                 data = early_memremap(pa_data, sizeof(*data));
 460                 e820_update_range(pa_data, sizeof(*data)+data->len,
 461                          E820_RAM, E820_RESERVED_KERN);
 462                 found = 1;
 463                 pa_data = data->next;
 464                 early_iounmap(data, sizeof(*data));
 465         }
 466         if (!found)
 467                 return;
 468
 469         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 470         memcpy(&e820_saved, &e820, sizeof(struct e820map));
 471         printk(KERN_INFO "extended physical RAM map:\n");
 472         e820_print_map("reserve setup_data");
 473 }
 474
 475 static void __init reserve_early_setup_data(void)
 476 {
 477         struct setup_data *data;
 478         u64 pa_data;
 479         char buf[32];
 480
 481         if (boot_params.hdr.version < 0x0209)
 482                 return;
 483         pa_data = boot_params.hdr.setup_data;
 484         while (pa_data) {
 485                 data = early_memremap(pa_data, sizeof(*data));
 486                 sprintf(buf, "setup data %x", data->type);
 487                 reserve_early(pa_data, pa_data+sizeof(*data)+data->len, buf);
 488                 pa_data = data->next;
 489                 early_iounmap(data, sizeof(*data));
 490         }
 491 }
 492
 493 /*
 494  * --------- Crashkernel reservation ------------------------------
 495  */
 496
 497 #ifdef CONFIG_KEXEC
 498
 499 /**
 500  * Reserve @size bytes of crashkernel memory at any suitable offset.
 501  *
 502  * @size: Size of the crashkernel memory to reserve.
 503  * Returns the base address on success, and -1ULL on failure.
 504  */
 505 static
 506 unsigned long long __init find_and_reserve_crashkernel(unsigned long long size)
 507 {
 508         const unsigned long long alignment = 16<<20;    /* 16M */
 509         unsigned long long start = 0LL;
 510
 511         while (1) {
 512                 int ret;
 513
 514                 start = find_e820_area(start, ULONG_MAX, size, alignment);
 515                 if (start == -1ULL)
 516                         return start;
 517
 518                 /* try to reserve it */
 519                 ret = reserve_bootmem_generic(start, size, BOOTMEM_EXCLUSIVE);
 520                 if (ret >= 0)
 521                         return start;
 522
 523                 start += alignment;
 524         }
 525 }
 526
 527 static inline unsigned long long get_total_mem(void)
 528 {
 529         unsigned long long total;
 530
 531         total = max_low_pfn - min_low_pfn;
 532 #ifdef CONFIG_HIGHMEM
 533         total += highend_pfn - highstart_pfn;
 534 #endif
 535
 536         return total << PAGE_SHIFT;
 537 }
 538
 539 static void __init reserve_crashkernel(void)
 540 {
 541         unsigned long long total_mem;
 542         unsigned long long crash_size, crash_base;
 543         int ret;
 544
 545         total_mem = get_total_mem();
 546
 547         ret = parse_crashkernel(boot_command_line, total_mem,
 548                         &crash_size, &crash_base);
 549         if (ret != 0 || crash_size <= 0)
 550                 return;
 551
 552         /* 0 means: find the address automatically */
 553         if (crash_base <= 0) {
 554                 crash_base = find_and_reserve_crashkernel(crash_size);
 555                 if (crash_base == -1ULL) {
 556                         pr_info("crashkernel reservation failed. "
 557                                 "No suitable area found.\n");
 558                         return;
 559                 }
 560         } else {
 561                 ret = reserve_bootmem_generic(crash_base, crash_size,
 562                                         BOOTMEM_EXCLUSIVE);
 563                 if (ret < 0) {
 564                         pr_info("crashkernel reservation failed - "
 565                                 "memory is in use\n");
 566                         return;
 567                 }
 568         }
 569
 570         printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
 571                         "for crashkernel (System RAM: %ldMB)\n",
 572                         (unsigned long)(crash_size >> 20),
 573                         (unsigned long)(crash_base >> 20),
 574                         (unsigned long)(total_mem >> 20));
 575
 576         crashk_res.start = crash_base;
 577         crashk_res.end   = crash_base + crash_size - 1;
 578         insert_resource(&iomem_resource, &crashk_res);
 579 }
 580 #else
 581 static void __init reserve_crashkernel(void)
 582 {
 583 }
 584 #endif
 585
 586 static struct resource standard_io_resources[] = {
 587         { .name = "dma1", .start = 0x00, .end = 0x1f,
 588                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 589         { .name = "pic1", .start = 0x20, .end = 0x21,
 590                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 591         { .name = "timer0", .start = 0x40, .end = 0x43,
 592                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 593         { .name = "timer1", .start = 0x50, .end = 0x53,
 594                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 595         { .name = "keyboard", .start = 0x60, .end = 0x60,
 596                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 597         { .name = "keyboard", .start = 0x64, .end = 0x64,
 598                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 599         { .name = "dma page reg", .start = 0x80, .end = 0x8f,
 600                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 601         { .name = "pic2", .start = 0xa0, .end = 0xa1,
 602                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 603         { .name = "dma2", .start = 0xc0, .end = 0xdf,
 604                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 605         { .name = "fpu", .start = 0xf0, .end = 0xff,
 606                 .flags = IORESOURCE_BUSY | IORESOURCE_IO }
 607 };
 608
 609 static void __init reserve_standard_io_resources(void)
 610 {
 611         int i;
 612
 613         /* request I/O space for devices used on all i[345]86 PCs */
 614         for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
 615                 request_resource(&ioport_resource, &standard_io_resources[i]);
 616
 617 }
 618
 619 /*
 620  * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
 621  * is_kdump_kernel() to determine if we are booting after a panic. Hence
 622  * ifdef it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
 623  */
 624
 625 #ifdef CONFIG_CRASH_DUMP
 626 /* elfcorehdr= specifies the location of elf core header
 627  * stored by the crashed kernel. This option will be passed
 628  * by kexec loader to the capture kernel.
 629  */
 630 static int __init setup_elfcorehdr(char *arg)
 631 {
 632         char *end;
 633         if (!arg)
 634                 return -EINVAL;
 635         elfcorehdr_addr = memparse(arg, &end);
 636         return end > arg ? 0 : -EINVAL;
 637 }
 638 early_param("elfcorehdr", setup_elfcorehdr);
 639 #endif
 640
 641 static struct x86_quirks default_x86_quirks __initdata;
 642
 643 struct x86_quirks *x86_quirks __initdata = &default_x86_quirks;
 644
 645 #ifdef CONFIG_X86_RESERVE_LOW_64K
 646 static int __init dmi_low_memory_corruption(const struct dmi_system_id *d)
 647 {
 648         printk(KERN_NOTICE
 649                 "%s detected: BIOS may corrupt low RAM, working around it.\n",
 650                 d->ident);
 651
 652         e820_update_range(0, 0x10000, E820_RAM, E820_RESERVED);
 653         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 654
 655         return 0;
 656 }
 657 #endif
 658
 659 /* List of systems that have known low memory corruption BIOS problems */
 660 static struct dmi_system_id __initdata bad_bios_dmi_table[] = {
 661 #ifdef CONFIG_X86_RESERVE_LOW_64K
 662         {
 663                 .callback = dmi_low_memory_corruption,
 664                 .ident = "AMI BIOS",
 665                 .matches = {
 666                         DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
 667                 },
 668         },
 669         {
 670                 .callback = dmi_low_memory_corruption,
 671                 .ident = "Phoenix BIOS",
 672                 .matches = {
 673                         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies"),
 674                 },
 675         },
 676         {
 677         /*
 678          * AMI BIOS with low memory corruption was found on Intel DG45ID board.
 679          * It hase different DMI_BIOS_VENDOR = "Intel Corp.", for now we will
 680          * match only DMI_BOARD_NAME and see if there is more bad products
 681          * with this vendor.
 682          */
 683                 .callback = dmi_low_memory_corruption,
 684                 .ident = "AMI BIOS",
 685                 .matches = {
 686                         DMI_MATCH(DMI_BOARD_NAME, "DG45ID"),
 687                 },
 688         },
 689 #endif
 690         {}
 691 };
 692
 693 /*
 694  * Determine if we were loaded by an EFI loader.  If so, then we have also been
 695  * passed the efi memmap, systab, etc., so we should use these data structures
 696  * for initialization.  Note, the efi init code path is determined by the
 697  * global efi_enabled. This allows the same kernel image to be used on existing
 698  * systems (with a traditional BIOS) as well as on EFI systems.
 699  */
 700 /*
 701  * setup_arch - architecture-specific boot-time initializations
 702  *
 703  * Note: On x86_64, fixmaps are ready for use even before this is called.
 704  */
 705
 706 void __init setup_arch(char **cmdline_p)
 707 {
 708 #ifdef CONFIG_X86_32
 709         memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
 710         visws_early_detect();
 711 #else
 712         printk(KERN_INFO "Command line: %s\n", boot_command_line);
 713 #endif
 714
 715         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 716         *cmdline_p = command_line;
 717
 718 #ifdef CONFIG_X86_64
 719         /*
 720          * Must call this twice: Once just to detect whether hardware doesn't
 721          * support NX (so that the early EHCI debug console setup can safely
 722          * call set_fixmap(), and then again after parsing early parameters to
 723          * honor the respective command line option.
 724          */
 725         check_efer();
 726 #endif
 727
 728         parse_early_param();
 729
 730         /* VMI may relocate the fixmap; do this before touching ioremap area */
 731         vmi_init();
 732
 733         early_cpu_init();
 734         early_ioremap_init();
 735
 736         ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
 737         screen_info = boot_params.screen_info;
 738         edid_info = boot_params.edid_info;
 739 #ifdef CONFIG_X86_32
 740         apm_info.bios = boot_params.apm_bios_info;
 741         ist_info = boot_params.ist_info;
 742         if (boot_params.sys_desc_table.length != 0) {
 743                 set_mca_bus(boot_params.sys_desc_table.table[3] & 0x2);
 744                 machine_id = boot_params.sys_desc_table.table[0];
 745                 machine_submodel_id = boot_params.sys_desc_table.table[1];
 746                 BIOS_revision = boot_params.sys_desc_table.table[2];
 747         }
 748 #endif
 749         saved_video_mode = boot_params.hdr.vid_mode;
 750         bootloader_type = boot_params.hdr.type_of_loader;
 751         if ((bootloader_type >> 4) == 0xe) {
 752                 bootloader_type &= 0xf;
 753                 bootloader_type |= (boot_params.hdr.ext_loader_type+0x10) << 4;
 754         }
 755         bootloader_version  = bootloader_type & 0xf;
 756         bootloader_version |= boot_params.hdr.ext_loader_ver << 4;
 757
 758 #ifdef CONFIG_BLK_DEV_RAM
 759         rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
 760         rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
 761         rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
 762 #endif
 763 #ifdef CONFIG_EFI
 764         if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
 765 #ifdef CONFIG_X86_32
 766                      "EL32",
 767 #else
 768                      "EL64",
 769 #endif
 770          4)) {
 771                 efi_enabled = 1;
 772                 efi_reserve_early();
 773         }
 774 #endif
 775
 776         ARCH_SETUP
 777
 778         setup_memory_map();
 779         parse_setup_data();
 780         /* update the e820_saved too */
 781         e820_reserve_setup_data();
 782
 783         copy_edd();
 784
 785         if (!boot_params.hdr.root_flags)
 786                 root_mountflags &= ~MS_RDONLY;
 787         init_mm.start_code = (unsigned long) _text;
 788         init_mm.end_code = (unsigned long) _etext;
 789         init_mm.end_data = (unsigned long) _edata;
 790         init_mm.brk = _brk_end;
 791
 792         code_resource.start = virt_to_phys(_text);
 793         code_resource.end = virt_to_phys(_etext)-1;
 794         data_resource.start = virt_to_phys(_etext);
 795         data_resource.end = virt_to_phys(_edata)-1;
 796         bss_resource.start = virt_to_phys(&__bss_start);
 797         bss_resource.end = virt_to_phys(&__bss_stop)-1;
 798
 799 #ifdef CONFIG_CMDLINE_BOOL
 800 #ifdef CONFIG_CMDLINE_OVERRIDE
 801         strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 802 #else
 803         if (builtin_cmdline[0]) {
 804                 /* append boot loader cmdline to builtin */
 805                 strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE);
 806                 strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE);
 807                 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 808         }
 809 #endif
 810 #endif
 811
 812 #ifdef CONFIG_X86_64
 813         check_efer();
 814 #endif
 815
 816         /* Must be before kernel pagetables are setup */
 817         vmi_activate();
 818
 819         /* after early param, so could get panic from serial */
 820         reserve_early_setup_data();
 821
 822         if (acpi_mps_check()) {
 823 #ifdef CONFIG_X86_LOCAL_APIC
 824                 disable_apic = 1;
 825 #endif
 826                 setup_clear_cpu_cap(X86_FEATURE_APIC);
 827         }
 828
 829 #ifdef CONFIG_PCI
 830         if (pci_early_dump_regs)
 831                 early_dump_pci_devices();
 832 #endif
 833
 834         finish_e820_parsing();
 835
 836         if (efi_enabled)
 837                 efi_init();
 838
 839         dmi_scan_machine();
 840
 841         dmi_check_system(bad_bios_dmi_table);
 842
 843         /*
 844          * VMware detection requires dmi to be available, so this
 845          * needs to be done after dmi_scan_machine, for the BP.
 846          */
 847         init_hypervisor(&boot_cpu_data);
 848
 849 #ifdef CONFIG_X86_32
 850         probe_roms();
 851 #endif
 852
 853         /* after parse_early_param, so could debug it */
 854         insert_resource(&iomem_resource, &code_resource);
 855         insert_resource(&iomem_resource, &data_resource);
 856         insert_resource(&iomem_resource, &bss_resource);
 857
 858
 859 #ifdef CONFIG_X86_32
 860         if (ppro_with_ram_bug()) {
 861                 e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM,
 862                                   E820_RESERVED);
 863                 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 864                 printk(KERN_INFO "fixed physical RAM map:\n");
 865                 e820_print_map("bad_ppro");
 866         }
 867 #else
 868         early_gart_iommu_check();
 869 #endif
 870
 871         /*
 872          * partially used pages are not usable - thus
 873          * we are rounding upwards:
 874          */
 875         max_pfn = e820_end_of_ram_pfn();
 876
 877         /* preallocate 4k for mptable mpc */
 878         early_reserve_e820_mpc_new();
 879         /* update e820 for memory not covered by WB MTRRs */
 880         mtrr_bp_init();
 881         if (mtrr_trim_uncached_memory(max_pfn))
 882                 max_pfn = e820_end_of_ram_pfn();
 883
 884 #ifdef CONFIG_X86_32
 885         /* max_low_pfn get updated here */
 886         find_low_pfn_range();
 887 #else
 888         num_physpages = max_pfn;
 889
 890         check_x2apic();
 891
 892         /* How many end-of-memory variables you have, grandma! */
 893         /* need this before calling reserve_initrd */
 894         if (max_pfn > (1UL<<(32 - PAGE_SHIFT)))
 895                 max_low_pfn = e820_end_of_low_ram_pfn();
 896         else
 897                 max_low_pfn = max_pfn;
 898
 899         high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
 900         max_pfn_mapped = KERNEL_IMAGE_SIZE >> PAGE_SHIFT;
 901 #endif
 902
 903 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
 904         setup_bios_corruption_check();
 905 #endif
 906
 907         printk(KERN_DEBUG "initial memory mapped : 0 - %08lx\n",
 908                         max_pfn_mapped<<PAGE_SHIFT);
 909
 910         reserve_brk();
 911
 912         init_gbpages();
 913
 914         /* max_pfn_mapped is updated here */
 915         max_low_pfn_mapped = init_memory_mapping(0, max_low_pfn<<PAGE_SHIFT);
 916         max_pfn_mapped = max_low_pfn_mapped;
 917
 918 #ifdef CONFIG_X86_64
 919         if (max_pfn > max_low_pfn) {
 920                 max_pfn_mapped = init_memory_mapping(1UL<<32,
 921                                                      max_pfn<<PAGE_SHIFT);
 922                 /* can we preseve max_low_pfn ?*/
 923                 max_low_pfn = max_pfn;
 924         }
 925 #endif
 926
 927         /*
 928          * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
 929          */
 930
 931 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
 932         if (init_ohci1394_dma_early)
 933                 init_ohci1394_dma_on_all_controllers();
 934 #endif
 935
 936         reserve_initrd();
 937
 938         vsmp_init();
 939
 940         io_delay_init();
 941
 942         /*
 943          * Parse the ACPI tables for possible boot-time SMP configuration.
 944          */
 945         acpi_boot_table_init();
 946
 947         early_acpi_boot_init();
 948
 949 #ifdef CONFIG_ACPI_NUMA
 950         /*
 951          * Parse SRAT to discover nodes.
 952          */
 953         acpi_numa_init();
 954 #endif
 955
 956         initmem_init(0, max_pfn);
 957
 958 #ifdef CONFIG_ACPI_SLEEP
 959         /*
 960          * Reserve low memory region for sleep support.
 961          */
 962         acpi_reserve_bootmem();
 963 #endif
 964         /*
 965          * Find and reserve possible boot-time SMP configuration:
 966          */
 967         find_smp_config();
 968
 969         reserve_crashkernel();
 970
 971 #ifdef CONFIG_X86_64
 972         /*
 973          * dma32_reserve_bootmem() allocates bootmem which may conflict
 974          * with the crashkernel command line, so do that after
 975          * reserve_crashkernel()
 976          */
 977         dma32_reserve_bootmem();
 978 #endif
 979
 980         reserve_ibft_region();
 981
 982 #ifdef CONFIG_KVM_CLOCK
 983         kvmclock_init();
 984 #endif
 985
 986         paravirt_pagetable_setup_start(swapper_pg_dir);
 987         paging_init();
 988         paravirt_pagetable_setup_done(swapper_pg_dir);
 989         paravirt_post_allocator_init();
 990
 991         tboot_probe();
 992
 993 #ifdef CONFIG_X86_64
 994         map_vsyscall();
 995 #endif
 996
 997         generic_apic_probe();
 998
 999         early_quirks();
1000
1001         /*
1002          * Read APIC and some other early information from ACPI tables.
1003          */
1004         acpi_boot_init();
1005
1006 #if defined(CONFIG_X86_MPPARSE) || defined(CONFIG_X86_VISWS)
1007         /*
1008          * get boot-time SMP configuration:
1009          */
1010         if (smp_found_config)
1011                 get_smp_config();
1012 #endif
1013
1014         prefill_possible_map();
1015
1016 #ifdef CONFIG_X86_64
1017         init_cpu_to_node();
1018 #endif
1019
1020         init_apic_mappings();
1021         ioapic_init_mappings();
1022
1023         /* need to wait for io_apic is mapped */
1024         probe_nr_irqs_gsi();
1025
1026         kvm_guest_init();
1027
1028         e820_reserve_resources();
1029         e820_mark_nosave_regions(max_low_pfn);
1030
1031 #ifdef CONFIG_X86_32
1032         request_resource(&iomem_resource, &video_ram_resource);
1033 #endif
1034         reserve_standard_io_resources();
1035
1036         e820_setup_gap();
1037
1038 #ifdef CONFIG_VT
1039 #if defined(CONFIG_VGA_CONSOLE)
1040         if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
1041                 conswitchp = &vga_con;
1042 #elif defined(CONFIG_DUMMY_CONSOLE)
1043         conswitchp = &dummy_con;
1044 #endif
1045 #endif
1046 }
1047
1048 #ifdef CONFIG_X86_32
1049
1050 /**
1051  * x86_quirk_intr_init - post gate setup interrupt initialisation
1052  *
1053  * Description:
1054  *      Fill in any interrupts that may have been left out by the general
1055  *      init_IRQ() routine.  interrupts having to do with the machine rather
1056  *      than the devices on the I/O bus (like APIC interrupts in intel MP
1057  *      systems) are started here.
1058  **/
1059 void __init x86_quirk_intr_init(void)
1060 {
1061         if (x86_quirks->arch_intr_init) {
1062                 if (x86_quirks->arch_intr_init())
1063                         return;
1064         }
1065 }
1066
1067 /**
1068  * x86_quirk_trap_init - initialise system specific traps
1069  *
1070  * Description:
1071  *      Called as the final act of trap_init().  Used in VISWS to initialise
1072  *      the various board specific APIC traps.
1073  **/
1074 void __init x86_quirk_trap_init(void)
1075 {
1076         if (x86_quirks->arch_trap_init) {
1077                 if (x86_quirks->arch_trap_init())
1078                         return;
1079         }
1080 }
1081
1082 static struct irqaction irq0  = {
1083         .handler = timer_interrupt,
1084         .flags = IRQF_DISABLED | IRQF_NOBALANCING | IRQF_IRQPOLL | IRQF_TIMER,
1085         .name = "timer"
1086 };
1087
1088 /**
1089  * x86_quirk_pre_time_init - do any specific initialisations before.
1090  *
1091  **/
1092 void __init x86_quirk_pre_time_init(void)
1093 {
1094         if (x86_quirks->arch_pre_time_init)
1095                 x86_quirks->arch_pre_time_init();
1096 }
1097
1098 /**
1099  * x86_quirk_time_init - do any specific initialisations for the system timer.
1100  *
1101  * Description:
1102  *      Must plug the system timer interrupt source at HZ into the IRQ listed
1103  *      in irq_vectors.h:TIMER_IRQ
1104  **/
1105 void __init x86_quirk_time_init(void)
1106 {
1107         if (x86_quirks->arch_time_init) {
1108                 /*
1109                  * A nonzero return code does not mean failure, it means
1110                  * that the architecture quirk does not want any
1111                  * generic (timer) setup to be performed after this:
1112                  */
1113                 if (x86_quirks->arch_time_init())
1114                         return;
1115         }
1116
1117         irq0.mask = cpumask_of_cpu(0);
1118         setup_irq(0, &irq0);
1119 }
1120 #endif /* CONFIG_X86_32 */