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/sfi.h>
  31 #include <linux/apm_bios.h>
  32 #include <linux/initrd.h>
  33 #include <linux/bootmem.h>
  34 #include <linux/memblock.h>
  35 #include <linux/seq_file.h>
  36 #include <linux/console.h>
  37 #include <linux/root_dev.h>
  38 #include <linux/highmem.h>
  39 #include <linux/module.h>
  40 #include <linux/efi.h>
  41 #include <linux/init.h>
  42 #include <linux/edd.h>
  43 #include <linux/iscsi_ibft.h>
  44 #include <linux/nodemask.h>
  45 #include <linux/kexec.h>
  46 #include <linux/dmi.h>
  47 #include <linux/pfn.h>
  48 #include <linux/pci.h>
  49 #include <asm/pci-direct.h>
  50 #include <linux/init_ohci1394_dma.h>
  51 #include <linux/kvm_para.h>
  52 #include <linux/dma-contiguous.h>
  53
  54 #include <linux/errno.h>
  55 #include <linux/kernel.h>
  56 #include <linux/stddef.h>
  57 #include <linux/unistd.h>
  58 #include <linux/ptrace.h>
  59 #include <linux/user.h>
  60 #include <linux/delay.h>
  61
  62 #include <linux/kallsyms.h>
  63 #include <linux/cpufreq.h>
  64 #include <linux/dma-mapping.h>
  65 #include <linux/ctype.h>
  66 #include <linux/uaccess.h>
  67
  68 #include <linux/percpu.h>
  69 #include <linux/crash_dump.h>
  70 #include <linux/tboot.h>
  71 #include <linux/jiffies.h>
  72
  73 #include <video/edid.h>
  74
  75 #include <asm/mtrr.h>
  76 #include <asm/apic.h>
  77 #include <asm/realmode.h>
  78 #include <asm/e820.h>
  79 #include <asm/mpspec.h>
  80 #include <asm/setup.h>
  81 #include <asm/efi.h>
  82 #include <asm/timer.h>
  83 #include <asm/i8259.h>
  84 #include <asm/sections.h>
  85 #include <asm/dmi.h>
  86 #include <asm/io_apic.h>
  87 #include <asm/ist.h>
  88 #include <asm/setup_arch.h>
  89 #include <asm/bios_ebda.h>
  90 #include <asm/cacheflush.h>
  91 #include <asm/processor.h>
  92 #include <asm/bugs.h>
  93
  94 #include <asm/vsyscall.h>
  95 #include <asm/cpu.h>
  96 #include <asm/desc.h>
  97 #include <asm/dma.h>
  98 #include <asm/iommu.h>
  99 #include <asm/gart.h>
 100 #include <asm/mmu_context.h>
 101 #include <asm/proto.h>
 102
 103 #include <asm/paravirt.h>
 104 #include <asm/hypervisor.h>
 105 #include <asm/olpc_ofw.h>
 106
 107 #include <asm/percpu.h>
 108 #include <asm/topology.h>
 109 #include <asm/apicdef.h>
 110 #include <asm/amd_nb.h>
 111 #include <asm/mce.h>
 112 #include <asm/alternative.h>
 113 #include <asm/prom.h>
 114
 115 /*
 116  * max_low_pfn_mapped: highest direct mapped pfn under 4GB
 117  * max_pfn_mapped:     highest direct mapped pfn over 4GB
 118  *
 119  * The direct mapping only covers E820_RAM regions, so the ranges and gaps are
 120  * represented by pfn_mapped
 121  */
 122 unsigned long max_low_pfn_mapped;
 123 unsigned long max_pfn_mapped;
 124
 125 #ifdef CONFIG_DMI
 126 RESERVE_BRK(dmi_alloc, 65536);
 127 #endif
 128
 129
 130 static __initdata unsigned long _brk_start = (unsigned long)__brk_base;
 131 unsigned long _brk_end = (unsigned long)__brk_base;
 132
 133 #ifdef CONFIG_X86_64
 134 int default_cpu_present_to_apicid(int mps_cpu)
 135 {
 136         return __default_cpu_present_to_apicid(mps_cpu);
 137 }
 138
 139 int default_check_phys_apicid_present(int phys_apicid)
 140 {
 141         return __default_check_phys_apicid_present(phys_apicid);
 142 }
 143 #endif
 144
 145 struct boot_params boot_params;
 146
 147 /*
 148  * Machine setup..
 149  */
 150 static struct resource data_resource = {
 151         .name   = "Kernel data",
 152         .start  = 0,
 153         .end    = 0,
 154         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 155 };
 156
 157 static struct resource code_resource = {
 158         .name   = "Kernel code",
 159         .start  = 0,
 160         .end    = 0,
 161         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 162 };
 163
 164 static struct resource bss_resource = {
 165         .name   = "Kernel bss",
 166         .start  = 0,
 167         .end    = 0,
 168         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 169 };
 170
 171
 172 #ifdef CONFIG_X86_32
 173 /* cpu data as detected by the assembly code in head.S */
 174 struct cpuinfo_x86 new_cpu_data __cpuinitdata = {0, 0, 0, 0, -1, 1, 0, 0, -1};
 175 /* common cpu data for all cpus */
 176 struct cpuinfo_x86 boot_cpu_data __read_mostly = {0, 0, 0, 0, -1, 1, 0, 0, -1};
 177 EXPORT_SYMBOL(boot_cpu_data);
 178
 179 unsigned int def_to_bigsmp;
 180
 181 /* for MCA, but anyone else can use it if they want */
 182 unsigned int machine_id;
 183 unsigned int machine_submodel_id;
 184 unsigned int BIOS_revision;
 185
 186 struct apm_info apm_info;
 187 EXPORT_SYMBOL(apm_info);
 188
 189 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
 190         defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
 191 struct ist_info ist_info;
 192 EXPORT_SYMBOL(ist_info);
 193 #else
 194 struct ist_info ist_info;
 195 #endif
 196
 197 #else
 198 struct cpuinfo_x86 boot_cpu_data __read_mostly = {
 199         .x86_phys_bits = MAX_PHYSMEM_BITS,
 200 };
 201 EXPORT_SYMBOL(boot_cpu_data);
 202 #endif
 203
 204
 205 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
 206 unsigned long mmu_cr4_features;
 207 #else
 208 unsigned long mmu_cr4_features = X86_CR4_PAE;
 209 #endif
 210
 211 /* Boot loader ID and version as integers, for the benefit of proc_dointvec */
 212 int bootloader_type, bootloader_version;
 213
 214 /*
 215  * Setup options
 216  */
 217 struct screen_info screen_info;
 218 EXPORT_SYMBOL(screen_info);
 219 struct edid_info edid_info;
 220 EXPORT_SYMBOL_GPL(edid_info);
 221
 222 extern int root_mountflags;
 223
 224 unsigned long saved_video_mode;
 225
 226 #define RAMDISK_IMAGE_START_MASK        0x07FF
 227 #define RAMDISK_PROMPT_FLAG             0x8000
 228 #define RAMDISK_LOAD_FLAG               0x4000
 229
 230 static char __initdata command_line[COMMAND_LINE_SIZE];
 231 #ifdef CONFIG_CMDLINE_BOOL
 232 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
 233 #endif
 234
 235 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
 236 struct edd edd;
 237 #ifdef CONFIG_EDD_MODULE
 238 EXPORT_SYMBOL(edd);
 239 #endif
 240 /**
 241  * copy_edd() - Copy the BIOS EDD information
 242  *              from boot_params into a safe place.
 243  *
 244  */
 245 static inline void __init copy_edd(void)
 246 {
 247      memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
 248             sizeof(edd.mbr_signature));
 249      memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
 250      edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
 251      edd.edd_info_nr = boot_params.eddbuf_entries;
 252 }
 253 #else
 254 static inline void __init copy_edd(void)
 255 {
 256 }
 257 #endif
 258
 259 void * __init extend_brk(size_t size, size_t align)
 260 {
 261         size_t mask = align - 1;
 262         void *ret;
 263
 264         BUG_ON(_brk_start == 0);
 265         BUG_ON(align & mask);
 266
 267         _brk_end = (_brk_end + mask) & ~mask;
 268         BUG_ON((char *)(_brk_end + size) > __brk_limit);
 269
 270         ret = (void *)_brk_end;
 271         _brk_end += size;
 272
 273         memset(ret, 0, size);
 274
 275         return ret;
 276 }
 277
 278 #ifdef CONFIG_X86_32
 279 static void __init cleanup_highmap(void)
 280 {
 281 }
 282 #endif
 283
 284 static void __init reserve_brk(void)
 285 {
 286         if (_brk_end > _brk_start)
 287                 memblock_reserve(__pa_symbol(_brk_start),
 288                                  _brk_end - _brk_start);
 289
 290         /* Mark brk area as locked down and no longer taking any
 291            new allocations */
 292         _brk_start = 0;
 293 }
 294
 295 #ifdef CONFIG_BLK_DEV_INITRD
 296
 297 static u64 __init get_ramdisk_image(void)
 298 {
 299         u64 ramdisk_image = boot_params.hdr.ramdisk_image;
 300
 301         ramdisk_image |= (u64)boot_params.ext_ramdisk_image << 32;
 302
 303         return ramdisk_image;
 304 }
 305 static u64 __init get_ramdisk_size(void)
 306 {
 307         u64 ramdisk_size = boot_params.hdr.ramdisk_size;
 308
 309         ramdisk_size |= (u64)boot_params.ext_ramdisk_size << 32;
 310
 311         return ramdisk_size;
 312 }
 313
 314 #define MAX_MAP_CHUNK   (NR_FIX_BTMAPS << PAGE_SHIFT)
 315 static void __init relocate_initrd(void)
 316 {
 317         /* Assume only end is not page aligned */
 318         u64 ramdisk_image = get_ramdisk_image();
 319         u64 ramdisk_size  = get_ramdisk_size();
 320         u64 area_size     = PAGE_ALIGN(ramdisk_size);
 321         u64 ramdisk_here;
 322         unsigned long slop, clen, mapaddr;
 323         char *p, *q;
 324
 325         /* We need to move the initrd down into directly mapped mem */
 326         ramdisk_here = memblock_find_in_range(0, PFN_PHYS(max_pfn_mapped),
 327                                                  area_size, PAGE_SIZE);
 328
 329         if (!ramdisk_here)
 330                 panic("Cannot find place for new RAMDISK of size %lld\n",
 331                          ramdisk_size);
 332
 333         /* Note: this includes all the mem currently occupied by
 334            the initrd, we rely on that fact to keep the data intact. */
 335         memblock_reserve(ramdisk_here, area_size);
 336         initrd_start = ramdisk_here + PAGE_OFFSET;
 337         initrd_end   = initrd_start + ramdisk_size;
 338         printk(KERN_INFO "Allocated new RAMDISK: [mem %#010llx-%#010llx]\n",
 339                          ramdisk_here, ramdisk_here + ramdisk_size - 1);
 340
 341         q = (char *)initrd_start;
 342
 343         /* Copy the initrd */
 344         while (ramdisk_size) {
 345                 slop = ramdisk_image & ~PAGE_MASK;
 346                 clen = ramdisk_size;
 347                 if (clen > MAX_MAP_CHUNK-slop)
 348                         clen = MAX_MAP_CHUNK-slop;
 349                 mapaddr = ramdisk_image & PAGE_MASK;
 350                 p = early_memremap(mapaddr, clen+slop);
 351                 memcpy(q, p+slop, clen);
 352                 early_iounmap(p, clen+slop);
 353                 q += clen;
 354                 ramdisk_image += clen;
 355                 ramdisk_size  -= clen;
 356         }
 357
 358         ramdisk_image = get_ramdisk_image();
 359         ramdisk_size  = get_ramdisk_size();
 360         printk(KERN_INFO "Move RAMDISK from [mem %#010llx-%#010llx] to"
 361                 " [mem %#010llx-%#010llx]\n",
 362                 ramdisk_image, ramdisk_image + ramdisk_size - 1,
 363                 ramdisk_here, ramdisk_here + ramdisk_size - 1);
 364 }
 365
 366 static void __init early_reserve_initrd(void)
 367 {
 368         /* Assume only end is not page aligned */
 369         u64 ramdisk_image = get_ramdisk_image();
 370         u64 ramdisk_size  = get_ramdisk_size();
 371         u64 ramdisk_end   = PAGE_ALIGN(ramdisk_image + ramdisk_size);
 372
 373         if (!boot_params.hdr.type_of_loader ||
 374             !ramdisk_image || !ramdisk_size)
 375                 return;         /* No initrd provided by bootloader */
 376
 377         memblock_reserve(ramdisk_image, ramdisk_end - ramdisk_image);
 378 }
 379 static void __init reserve_initrd(void)
 380 {
 381         /* Assume only end is not page aligned */
 382         u64 ramdisk_image = get_ramdisk_image();
 383         u64 ramdisk_size  = get_ramdisk_size();
 384         u64 ramdisk_end   = PAGE_ALIGN(ramdisk_image + ramdisk_size);
 385         u64 mapped_size;
 386
 387         if (!boot_params.hdr.type_of_loader ||
 388             !ramdisk_image || !ramdisk_size)
 389                 return;         /* No initrd provided by bootloader */
 390
 391         initrd_start = 0;
 392
 393         mapped_size = memblock_mem_size(max_pfn_mapped);
 394         if (ramdisk_size >= (mapped_size>>1))
 395                 panic("initrd too large to handle, "
 396                        "disabling initrd (%lld needed, %lld available)\n",
 397                        ramdisk_size, mapped_size>>1);
 398
 399         printk(KERN_INFO "RAMDISK: [mem %#010llx-%#010llx]\n", ramdisk_image,
 400                         ramdisk_end - 1);
 401
 402         if (pfn_range_is_mapped(PFN_DOWN(ramdisk_image),
 403                                 PFN_DOWN(ramdisk_end))) {
 404                 /* All are mapped, easy case */
 405                 initrd_start = ramdisk_image + PAGE_OFFSET;
 406                 initrd_end = initrd_start + ramdisk_size;
 407                 return;
 408         }
 409
 410         relocate_initrd();
 411
 412         memblock_free(ramdisk_image, ramdisk_end - ramdisk_image);
 413 }
 414 #else
 415 static void __init early_reserve_initrd(void)
 416 {
 417 }
 418 static void __init reserve_initrd(void)
 419 {
 420 }
 421 #endif /* CONFIG_BLK_DEV_INITRD */
 422
 423 static void __init parse_setup_data(void)
 424 {
 425         struct setup_data *data;
 426         u64 pa_data;
 427
 428         pa_data = boot_params.hdr.setup_data;
 429         while (pa_data) {
 430                 u32 data_len, map_len;
 431
 432                 map_len = max(PAGE_SIZE - (pa_data & ~PAGE_MASK),
 433                               (u64)sizeof(struct setup_data));
 434                 data = early_memremap(pa_data, map_len);
 435                 data_len = data->len + sizeof(struct setup_data);
 436                 if (data_len > map_len) {
 437                         early_iounmap(data, map_len);
 438                         data = early_memremap(pa_data, data_len);
 439                         map_len = data_len;
 440                 }
 441
 442                 switch (data->type) {
 443                 case SETUP_E820_EXT:
 444                         parse_e820_ext(data);
 445                         break;
 446                 case SETUP_DTB:
 447                         add_dtb(pa_data);
 448                         break;
 449                 default:
 450                         break;
 451                 }
 452                 pa_data = data->next;
 453                 early_iounmap(data, map_len);
 454         }
 455 }
 456
 457 static void __init e820_reserve_setup_data(void)
 458 {
 459         struct setup_data *data;
 460         u64 pa_data;
 461         int found = 0;
 462
 463         pa_data = boot_params.hdr.setup_data;
 464         while (pa_data) {
 465                 data = early_memremap(pa_data, sizeof(*data));
 466                 e820_update_range(pa_data, sizeof(*data)+data->len,
 467                          E820_RAM, E820_RESERVED_KERN);
 468                 found = 1;
 469                 pa_data = data->next;
 470                 early_iounmap(data, sizeof(*data));
 471         }
 472         if (!found)
 473                 return;
 474
 475         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 476         memcpy(&e820_saved, &e820, sizeof(struct e820map));
 477         printk(KERN_INFO "extended physical RAM map:\n");
 478         e820_print_map("reserve setup_data");
 479 }
 480
 481 static void __init memblock_x86_reserve_range_setup_data(void)
 482 {
 483         struct setup_data *data;
 484         u64 pa_data;
 485
 486         pa_data = boot_params.hdr.setup_data;
 487         while (pa_data) {
 488                 data = early_memremap(pa_data, sizeof(*data));
 489                 memblock_reserve(pa_data, sizeof(*data) + data->len);
 490                 pa_data = data->next;
 491                 early_iounmap(data, sizeof(*data));
 492         }
 493 }
 494
 495 /*
 496  * --------- Crashkernel reservation ------------------------------
 497  */
 498
 499 #ifdef CONFIG_KEXEC
 500
 501 /*
 502  * Keep the crash kernel below this limit.  On 32 bits earlier kernels
 503  * would limit the kernel to the low 512 MiB due to mapping restrictions.
 504  */
 505 #ifdef CONFIG_X86_32
 506 # define CRASH_KERNEL_ADDR_MAX  (512 << 20)
 507 #else
 508 # define CRASH_KERNEL_ADDR_MAX  MAXMEM
 509 #endif
 510
 511 static void __init reserve_crashkernel_low(void)
 512 {
 513 #ifdef CONFIG_X86_64
 514         const unsigned long long alignment = 16<<20;    /* 16M */
 515         unsigned long long low_base = 0, low_size = 0;
 516         unsigned long total_low_mem;
 517         unsigned long long base;
 518         int ret;
 519
 520         total_low_mem = memblock_mem_size(1UL<<(32-PAGE_SHIFT));
 521         ret = parse_crashkernel_low(boot_command_line, total_low_mem,
 522                                                 &low_size, &base);
 523         if (ret != 0 || low_size <= 0)
 524                 return;
 525
 526         low_base = memblock_find_in_range(low_size, (1ULL<<32),
 527                                         low_size, alignment);
 528
 529         if (!low_base) {
 530                 pr_info("crashkernel low reservation failed - No suitable area found.\n");
 531
 532                 return;
 533         }
 534
 535         memblock_reserve(low_base, low_size);
 536         pr_info("Reserving %ldMB of low memory at %ldMB for crashkernel (System low RAM: %ldMB)\n",
 537                         (unsigned long)(low_size >> 20),
 538                         (unsigned long)(low_base >> 20),
 539                         (unsigned long)(total_low_mem >> 20));
 540         crashk_low_res.start = low_base;
 541         crashk_low_res.end   = low_base + low_size - 1;
 542         insert_resource(&iomem_resource, &crashk_low_res);
 543 #endif
 544 }
 545
 546 static void __init reserve_crashkernel(void)
 547 {
 548         const unsigned long long alignment = 16<<20;    /* 16M */
 549         unsigned long long total_mem;
 550         unsigned long long crash_size, crash_base;
 551         int ret;
 552
 553         total_mem = memblock_phys_mem_size();
 554
 555         ret = parse_crashkernel(boot_command_line, total_mem,
 556                         &crash_size, &crash_base);
 557         if (ret != 0 || crash_size <= 0)
 558                 return;
 559
 560         /* 0 means: find the address automatically */
 561         if (crash_base <= 0) {
 562                 /*
 563                  *  kexec want bzImage is below CRASH_KERNEL_ADDR_MAX
 564                  */
 565                 crash_base = memblock_find_in_range(alignment,
 566                                CRASH_KERNEL_ADDR_MAX, crash_size, alignment);
 567
 568                 if (!crash_base) {
 569                         pr_info("crashkernel reservation failed - No suitable area found.\n");
 570                         return;
 571                 }
 572
 573         } else {
 574                 unsigned long long start;
 575
 576                 start = memblock_find_in_range(crash_base,
 577                                  crash_base + crash_size, crash_size, 1<<20);
 578                 if (start != crash_base) {
 579                         pr_info("crashkernel reservation failed - memory is in use.\n");
 580                         return;
 581                 }
 582         }
 583         memblock_reserve(crash_base, crash_size);
 584
 585         printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
 586                         "for crashkernel (System RAM: %ldMB)\n",
 587                         (unsigned long)(crash_size >> 20),
 588                         (unsigned long)(crash_base >> 20),
 589                         (unsigned long)(total_mem >> 20));
 590
 591         crashk_res.start = crash_base;
 592         crashk_res.end   = crash_base + crash_size - 1;
 593         insert_resource(&iomem_resource, &crashk_res);
 594
 595         if (crash_base >= (1ULL<<32))
 596                 reserve_crashkernel_low();
 597 }
 598 #else
 599 static void __init reserve_crashkernel(void)
 600 {
 601 }
 602 #endif
 603
 604 static struct resource standard_io_resources[] = {
 605         { .name = "dma1", .start = 0x00, .end = 0x1f,
 606                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 607         { .name = "pic1", .start = 0x20, .end = 0x21,
 608                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 609         { .name = "timer0", .start = 0x40, .end = 0x43,
 610                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 611         { .name = "timer1", .start = 0x50, .end = 0x53,
 612                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 613         { .name = "keyboard", .start = 0x60, .end = 0x60,
 614                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 615         { .name = "keyboard", .start = 0x64, .end = 0x64,
 616                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 617         { .name = "dma page reg", .start = 0x80, .end = 0x8f,
 618                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 619         { .name = "pic2", .start = 0xa0, .end = 0xa1,
 620                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 621         { .name = "dma2", .start = 0xc0, .end = 0xdf,
 622                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 623         { .name = "fpu", .start = 0xf0, .end = 0xff,
 624                 .flags = IORESOURCE_BUSY | IORESOURCE_IO }
 625 };
 626
 627 void __init reserve_standard_io_resources(void)
 628 {
 629         int i;
 630
 631         /* request I/O space for devices used on all i[345]86 PCs */
 632         for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
 633                 request_resource(&ioport_resource, &standard_io_resources[i]);
 634
 635 }
 636
 637 static __init void reserve_ibft_region(void)
 638 {
 639         unsigned long addr, size = 0;
 640
 641         addr = find_ibft_region(&size);
 642
 643         if (size)
 644                 memblock_reserve(addr, size);
 645 }
 646
 647 static bool __init snb_gfx_workaround_needed(void)
 648 {
 649 #ifdef CONFIG_PCI
 650         int i;
 651         u16 vendor, devid;
 652         static const __initconst u16 snb_ids[] = {
 653                 0x0102,
 654                 0x0112,
 655                 0x0122,
 656                 0x0106,
 657                 0x0116,
 658                 0x0126,
 659                 0x010a,
 660         };
 661
 662         /* Assume no if something weird is going on with PCI */
 663         if (!early_pci_allowed())
 664                 return false;
 665
 666         vendor = read_pci_config_16(0, 2, 0, PCI_VENDOR_ID);
 667         if (vendor != 0x8086)
 668                 return false;
 669
 670         devid = read_pci_config_16(0, 2, 0, PCI_DEVICE_ID);
 671         for (i = 0; i < ARRAY_SIZE(snb_ids); i++)
 672                 if (devid == snb_ids[i])
 673                         return true;
 674 #endif
 675
 676         return false;
 677 }
 678
 679 /*
 680  * Sandy Bridge graphics has trouble with certain ranges, exclude
 681  * them from allocation.
 682  */
 683 static void __init trim_snb_memory(void)
 684 {
 685         static const __initconst unsigned long bad_pages[] = {
 686                 0x20050000,
 687                 0x20110000,
 688                 0x20130000,
 689                 0x20138000,
 690                 0x40004000,
 691         };
 692         int i;
 693
 694         if (!snb_gfx_workaround_needed())
 695                 return;
 696
 697         printk(KERN_DEBUG "reserving inaccessible SNB gfx pages\n");
 698
 699         /*
 700          * Reserve all memory below the 1 MB mark that has not
 701          * already been reserved.
 702          */
 703         memblock_reserve(0, 1<<20);
 704
 705         for (i = 0; i < ARRAY_SIZE(bad_pages); i++) {
 706                 if (memblock_reserve(bad_pages[i], PAGE_SIZE))
 707                         printk(KERN_WARNING "failed to reserve 0x%08lx\n",
 708                                bad_pages[i]);
 709         }
 710 }
 711
 712 /*
 713  * Here we put platform-specific memory range workarounds, i.e.
 714  * memory known to be corrupt or otherwise in need to be reserved on
 715  * specific platforms.
 716  *
 717  * If this gets used more widely it could use a real dispatch mechanism.
 718  */
 719 static void __init trim_platform_memory_ranges(void)
 720 {
 721         trim_snb_memory();
 722 }
 723
 724 static void __init trim_bios_range(void)
 725 {
 726         /*
 727          * A special case is the first 4Kb of memory;
 728          * This is a BIOS owned area, not kernel ram, but generally
 729          * not listed as such in the E820 table.
 730          *
 731          * This typically reserves additional memory (64KiB by default)
 732          * since some BIOSes are known to corrupt low memory.  See the
 733          * Kconfig help text for X86_RESERVE_LOW.
 734          */
 735         e820_update_range(0, PAGE_SIZE, E820_RAM, E820_RESERVED);
 736
 737         /*
 738          * special case: Some BIOSen report the PC BIOS
 739          * area (640->1Mb) as ram even though it is not.
 740          * take them out.
 741          */
 742         e820_remove_range(BIOS_BEGIN, BIOS_END - BIOS_BEGIN, E820_RAM, 1);
 743
 744         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 745 }
 746
 747 /* called before trim_bios_range() to spare extra sanitize */
 748 static void __init e820_add_kernel_range(void)
 749 {
 750         u64 start = __pa_symbol(_text);
 751         u64 size = __pa_symbol(_end) - start;
 752
 753         /*
 754          * Complain if .text .data and .bss are not marked as E820_RAM and
 755          * attempt to fix it by adding the range. We may have a confused BIOS,
 756          * or the user may have used memmap=exactmap or memmap=xxM$yyM to
 757          * exclude kernel range. If we really are running on top non-RAM,
 758          * we will crash later anyways.
 759          */
 760         if (e820_all_mapped(start, start + size, E820_RAM))
 761                 return;
 762
 763         pr_warn(".text .data .bss are not marked as E820_RAM!\n");
 764         e820_remove_range(start, size, E820_RAM, 0);
 765         e820_add_region(start, size, E820_RAM);
 766 }
 767
 768 static unsigned reserve_low = CONFIG_X86_RESERVE_LOW << 10;
 769
 770 static int __init parse_reservelow(char *p)
 771 {
 772         unsigned long long size;
 773
 774         if (!p)
 775                 return -EINVAL;
 776
 777         size = memparse(p, &p);
 778
 779         if (size < 4096)
 780                 size = 4096;
 781
 782         if (size > 640*1024)
 783                 size = 640*1024;
 784
 785         reserve_low = size;
 786
 787         return 0;
 788 }
 789
 790 early_param("reservelow", parse_reservelow);
 791
 792 static void __init trim_low_memory_range(void)
 793 {
 794         memblock_reserve(0, ALIGN(reserve_low, PAGE_SIZE));
 795 }
 796
 797 /*
 798  * Determine if we were loaded by an EFI loader.  If so, then we have also been
 799  * passed the efi memmap, systab, etc., so we should use these data structures
 800  * for initialization.  Note, the efi init code path is determined by the
 801  * global efi_enabled. This allows the same kernel image to be used on existing
 802  * systems (with a traditional BIOS) as well as on EFI systems.
 803  */
 804 /*
 805  * setup_arch - architecture-specific boot-time initializations
 806  *
 807  * Note: On x86_64, fixmaps are ready for use even before this is called.
 808  */
 809
 810 void __init setup_arch(char **cmdline_p)
 811 {
 812         memblock_reserve(__pa_symbol(_text),
 813                          (unsigned long)__bss_stop - (unsigned long)_text);
 814
 815         early_reserve_initrd();
 816
 817         /*
 818          * At this point everything still needed from the boot loader
 819          * or BIOS or kernel text should be early reserved or marked not
 820          * RAM in e820. All other memory is free game.
 821          */
 822
 823 #ifdef CONFIG_X86_32
 824         memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
 825         visws_early_detect();
 826
 827         /*
 828          * copy kernel address range established so far and switch
 829          * to the proper swapper page table
 830          */
 831         clone_pgd_range(swapper_pg_dir     + KERNEL_PGD_BOUNDARY,
 832                         initial_page_table + KERNEL_PGD_BOUNDARY,
 833                         KERNEL_PGD_PTRS);
 834
 835         load_cr3(swapper_pg_dir);
 836         __flush_tlb_all();
 837 #else
 838         printk(KERN_INFO "Command line: %s\n", boot_command_line);
 839 #endif
 840
 841         /*
 842          * If we have OLPC OFW, we might end up relocating the fixmap due to
 843          * reserve_top(), so do this before touching the ioremap area.
 844          */
 845         olpc_ofw_detect();
 846
 847         early_trap_init();
 848         early_cpu_init();
 849         early_ioremap_init();
 850
 851         setup_olpc_ofw_pgd();
 852
 853         ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
 854         screen_info = boot_params.screen_info;
 855         edid_info = boot_params.edid_info;
 856 #ifdef CONFIG_X86_32
 857         apm_info.bios = boot_params.apm_bios_info;
 858         ist_info = boot_params.ist_info;
 859         if (boot_params.sys_desc_table.length != 0) {
 860                 machine_id = boot_params.sys_desc_table.table[0];
 861                 machine_submodel_id = boot_params.sys_desc_table.table[1];
 862                 BIOS_revision = boot_params.sys_desc_table.table[2];
 863         }
 864 #endif
 865         saved_video_mode = boot_params.hdr.vid_mode;
 866         bootloader_type = boot_params.hdr.type_of_loader;
 867         if ((bootloader_type >> 4) == 0xe) {
 868                 bootloader_type &= 0xf;
 869                 bootloader_type |= (boot_params.hdr.ext_loader_type+0x10) << 4;
 870         }
 871         bootloader_version  = bootloader_type & 0xf;
 872         bootloader_version |= boot_params.hdr.ext_loader_ver << 4;
 873
 874 #ifdef CONFIG_BLK_DEV_RAM
 875         rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
 876         rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
 877         rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
 878 #endif
 879 #ifdef CONFIG_EFI
 880         if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
 881                      "EL32", 4)) {
 882                 set_bit(EFI_BOOT, &x86_efi_facility);
 883         } else if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
 884                      "EL64", 4)) {
 885                 set_bit(EFI_BOOT, &x86_efi_facility);
 886                 set_bit(EFI_64BIT, &x86_efi_facility);
 887         }
 888
 889         if (efi_enabled(EFI_BOOT))
 890                 efi_memblock_x86_reserve_range();
 891 #endif
 892
 893         x86_init.oem.arch_setup();
 894
 895         iomem_resource.end = (1ULL << boot_cpu_data.x86_phys_bits) - 1;
 896         setup_memory_map();
 897         parse_setup_data();
 898         /* update the e820_saved too */
 899         e820_reserve_setup_data();
 900
 901         copy_edd();
 902
 903         if (!boot_params.hdr.root_flags)
 904                 root_mountflags &= ~MS_RDONLY;
 905         init_mm.start_code = (unsigned long) _text;
 906         init_mm.end_code = (unsigned long) _etext;
 907         init_mm.end_data = (unsigned long) _edata;
 908         init_mm.brk = _brk_end;
 909
 910         code_resource.start = __pa_symbol(_text);
 911         code_resource.end = __pa_symbol(_etext)-1;
 912         data_resource.start = __pa_symbol(_etext);
 913         data_resource.end = __pa_symbol(_edata)-1;
 914         bss_resource.start = __pa_symbol(__bss_start);
 915         bss_resource.end = __pa_symbol(__bss_stop)-1;
 916
 917 #ifdef CONFIG_CMDLINE_BOOL
 918 #ifdef CONFIG_CMDLINE_OVERRIDE
 919         strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 920 #else
 921         if (builtin_cmdline[0]) {
 922                 /* append boot loader cmdline to builtin */
 923                 strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE);
 924                 strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE);
 925                 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 926         }
 927 #endif
 928 #endif
 929
 930         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 931         *cmdline_p = command_line;
 932
 933         /*
 934          * x86_configure_nx() is called before parse_early_param() to detect
 935          * whether hardware doesn't support NX (so that the early EHCI debug
 936          * console setup can safely call set_fixmap()). It may then be called
 937          * again from within noexec_setup() during parsing early parameters
 938          * to honor the respective command line option.
 939          */
 940         x86_configure_nx();
 941
 942         parse_early_param();
 943
 944         x86_report_nx();
 945
 946         /* after early param, so could get panic from serial */
 947         memblock_x86_reserve_range_setup_data();
 948
 949         if (acpi_mps_check()) {
 950 #ifdef CONFIG_X86_LOCAL_APIC
 951                 disable_apic = 1;
 952 #endif
 953                 setup_clear_cpu_cap(X86_FEATURE_APIC);
 954         }
 955
 956 #ifdef CONFIG_PCI
 957         if (pci_early_dump_regs)
 958                 early_dump_pci_devices();
 959 #endif
 960
 961         finish_e820_parsing();
 962
 963         if (efi_enabled(EFI_BOOT))
 964                 efi_init();
 965
 966         dmi_scan_machine();
 967
 968         /*
 969          * VMware detection requires dmi to be available, so this
 970          * needs to be done after dmi_scan_machine, for the BP.
 971          */
 972         init_hypervisor_platform();
 973
 974         x86_init.resources.probe_roms();
 975
 976         /* after parse_early_param, so could debug it */
 977         insert_resource(&iomem_resource, &code_resource);
 978         insert_resource(&iomem_resource, &data_resource);
 979         insert_resource(&iomem_resource, &bss_resource);
 980
 981         e820_add_kernel_range();
 982         trim_bios_range();
 983 #ifdef CONFIG_X86_32
 984         if (ppro_with_ram_bug()) {
 985                 e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM,
 986                                   E820_RESERVED);
 987                 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 988                 printk(KERN_INFO "fixed physical RAM map:\n");
 989                 e820_print_map("bad_ppro");
 990         }
 991 #else
 992         early_gart_iommu_check();
 993 #endif
 994
 995         /*
 996          * partially used pages are not usable - thus
 997          * we are rounding upwards:
 998          */
 999         max_pfn = e820_end_of_ram_pfn();
1000
1001         /* update e820 for memory not covered by WB MTRRs */
1002         mtrr_bp_init();
1003         if (mtrr_trim_uncached_memory(max_pfn))
1004                 max_pfn = e820_end_of_ram_pfn();
1005
1006 #ifdef CONFIG_X86_32
1007         /* max_low_pfn get updated here */
1008         find_low_pfn_range();
1009 #else
1010         num_physpages = max_pfn;
1011
1012         check_x2apic();
1013
1014         /* How many end-of-memory variables you have, grandma! */
1015         /* need this before calling reserve_initrd */
1016         if (max_pfn > (1UL<<(32 - PAGE_SHIFT)))
1017                 max_low_pfn = e820_end_of_low_ram_pfn();
1018         else
1019                 max_low_pfn = max_pfn;
1020
1021         high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
1022 #endif
1023
1024         /*
1025          * Find and reserve possible boot-time SMP configuration:
1026          */
1027         find_smp_config();
1028
1029         reserve_ibft_region();
1030
1031         early_alloc_pgt_buf();
1032
1033         /*
1034          * Need to conclude brk, before memblock_x86_fill()
1035          *  it could use memblock_find_in_range, could overlap with
1036          *  brk area.
1037          */
1038         reserve_brk();
1039
1040         cleanup_highmap();
1041
1042         memblock.current_limit = ISA_END_ADDRESS;
1043         memblock_x86_fill();
1044
1045         /*
1046          * The EFI specification says that boot service code won't be called
1047          * after ExitBootServices(). This is, in fact, a lie.
1048          */
1049         if (efi_enabled(EFI_MEMMAP))
1050                 efi_reserve_boot_services();
1051
1052         /* preallocate 4k for mptable mpc */
1053         early_reserve_e820_mpc_new();
1054
1055 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
1056         setup_bios_corruption_check();
1057 #endif
1058
1059 #ifdef CONFIG_X86_32
1060         printk(KERN_DEBUG "initial memory mapped: [mem 0x00000000-%#010lx]\n",
1061                         (max_pfn_mapped<<PAGE_SHIFT) - 1);
1062 #endif
1063
1064         reserve_real_mode();
1065
1066         trim_platform_memory_ranges();
1067         trim_low_memory_range();
1068
1069         init_mem_mapping();
1070
1071         early_trap_pf_init();
1072
1073         setup_real_mode();
1074
1075         memblock.current_limit = get_max_mapped();
1076         dma_contiguous_reserve(0);
1077
1078         /*
1079          * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
1080          */
1081
1082 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
1083         if (init_ohci1394_dma_early)
1084                 init_ohci1394_dma_on_all_controllers();
1085 #endif
1086         /* Allocate bigger log buffer */
1087         setup_log_buf(1);
1088
1089         reserve_initrd();
1090
1091 #if defined(CONFIG_ACPI) && defined(CONFIG_BLK_DEV_INITRD)
1092         acpi_initrd_override((void *)initrd_start, initrd_end - initrd_start);
1093 #endif
1094
1095         reserve_crashkernel();
1096
1097         vsmp_init();
1098
1099         io_delay_init();
1100
1101         /*
1102          * Parse the ACPI tables for possible boot-time SMP configuration.
1103          */
1104         acpi_boot_table_init();
1105
1106         early_acpi_boot_init();
1107
1108         initmem_init();
1109         memblock_find_dma_reserve();
1110
1111 #ifdef CONFIG_KVM_GUEST
1112         kvmclock_init();
1113 #endif
1114
1115         x86_init.paging.pagetable_init();
1116
1117         if (boot_cpu_data.cpuid_level >= 0) {
1118                 /* A CPU has %cr4 if and only if it has CPUID */
1119                 mmu_cr4_features = read_cr4();
1120                 if (trampoline_cr4_features)
1121                         *trampoline_cr4_features = mmu_cr4_features;
1122         }
1123
1124 #ifdef CONFIG_X86_32
1125         /* sync back kernel address range */
1126         clone_pgd_range(initial_page_table + KERNEL_PGD_BOUNDARY,
1127                         swapper_pg_dir     + KERNEL_PGD_BOUNDARY,
1128                         KERNEL_PGD_PTRS);
1129 #endif
1130
1131         tboot_probe();
1132
1133 #ifdef CONFIG_X86_64
1134         map_vsyscall();
1135 #endif
1136
1137         generic_apic_probe();
1138
1139         early_quirks();
1140
1141         /*
1142          * Read APIC and some other early information from ACPI tables.
1143          */
1144         acpi_boot_init();
1145         sfi_init();
1146         x86_dtb_init();
1147
1148         /*
1149          * get boot-time SMP configuration:
1150          */
1151         if (smp_found_config)
1152                 get_smp_config();
1153
1154         prefill_possible_map();
1155
1156         init_cpu_to_node();
1157
1158         init_apic_mappings();
1159         if (x86_io_apic_ops.init)
1160                 x86_io_apic_ops.init();
1161
1162         kvm_guest_init();
1163
1164         e820_reserve_resources();
1165         e820_mark_nosave_regions(max_low_pfn);
1166
1167         x86_init.resources.reserve_resources();
1168
1169         e820_setup_gap();
1170
1171 #ifdef CONFIG_VT
1172 #if defined(CONFIG_VGA_CONSOLE)
1173         if (!efi_enabled(EFI_BOOT) || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
1174                 conswitchp = &vga_con;
1175 #elif defined(CONFIG_DUMMY_CONSOLE)
1176         conswitchp = &dummy_con;
1177 #endif
1178 #endif
1179         x86_init.oem.banner();
1180
1181         x86_init.timers.wallclock_init();
1182
1183         mcheck_init();
1184
1185         arch_init_ideal_nops();
1186
1187         register_refined_jiffies(CLOCK_TICK_RATE);
1188
1189 #ifdef CONFIG_EFI
1190         /* Once setup is done above, unmap the EFI memory map on
1191          * mismatched firmware/kernel archtectures since there is no
1192          * support for runtime services.
1193          */
1194         if (efi_enabled(EFI_BOOT) && !efi_is_native()) {
1195                 pr_info("efi: Setup done, disabling due to 32/64-bit mismatch\n");
1196                 efi_unmap_memmap();
1197         }
1198 #endif
1199 }
1200
1201 #ifdef CONFIG_X86_32
1202
1203 static struct resource video_ram_resource = {
1204         .name   = "Video RAM area",
1205         .start  = 0xa0000,
1206         .end    = 0xbffff,
1207         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
1208 };
1209
1210 void __init i386_reserve_resources(void)
1211 {
1212         request_resource(&iomem_resource, &video_ram_resource);
1213         reserve_standard_io_resources();
1214 }
1215
1216 #endif /* CONFIG_X86_32 */