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/io_apic.h>
  86 #include <asm/ist.h>
  87 #include <asm/setup_arch.h>
  88 #include <asm/bios_ebda.h>
  89 #include <asm/cacheflush.h>
  90 #include <asm/processor.h>
  91 #include <asm/bugs.h>
  92 #include <asm/kasan.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 #include <asm/microcode.h>
 115
 116 /*
 117  * max_low_pfn_mapped: highest direct mapped pfn under 4GB
 118  * max_pfn_mapped:     highest direct mapped pfn over 4GB
 119  *
 120  * The direct mapping only covers E820_RAM regions, so the ranges and gaps are
 121  * represented by pfn_mapped
 122  */
 123 unsigned long max_low_pfn_mapped;
 124 unsigned long max_pfn_mapped;
 125
 126 #ifdef CONFIG_DMI
 127 RESERVE_BRK(dmi_alloc, 65536);
 128 #endif
 129
 130
 131 static __initdata unsigned long _brk_start = (unsigned long)__brk_base;
 132 unsigned long _brk_end = (unsigned long)__brk_base;
 133
 134 #ifdef CONFIG_X86_64
 135 int default_cpu_present_to_apicid(int mps_cpu)
 136 {
 137         return __default_cpu_present_to_apicid(mps_cpu);
 138 }
 139
 140 int default_check_phys_apicid_present(int phys_apicid)
 141 {
 142         return __default_check_phys_apicid_present(phys_apicid);
 143 }
 144 #endif
 145
 146 struct boot_params boot_params;
 147
 148 /*
 149  * Machine setup..
 150  */
 151 static struct resource data_resource = {
 152         .name   = "Kernel data",
 153         .start  = 0,
 154         .end    = 0,
 155         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 156 };
 157
 158 static struct resource code_resource = {
 159         .name   = "Kernel code",
 160         .start  = 0,
 161         .end    = 0,
 162         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 163 };
 164
 165 static struct resource bss_resource = {
 166         .name   = "Kernel bss",
 167         .start  = 0,
 168         .end    = 0,
 169         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
 170 };
 171
 172
 173 #ifdef CONFIG_X86_32
 174 /* cpu data as detected by the assembly code in head.S */
 175 struct cpuinfo_x86 new_cpu_data = {
 176         .wp_works_ok = -1,
 177 };
 178 /* common cpu data for all cpus */
 179 struct cpuinfo_x86 boot_cpu_data __read_mostly = {
 180         .wp_works_ok = -1,
 181 };
 182 EXPORT_SYMBOL(boot_cpu_data);
 183
 184 unsigned int def_to_bigsmp;
 185
 186 /* for MCA, but anyone else can use it if they want */
 187 unsigned int machine_id;
 188 unsigned int machine_submodel_id;
 189 unsigned int BIOS_revision;
 190
 191 struct apm_info apm_info;
 192 EXPORT_SYMBOL(apm_info);
 193
 194 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
 195         defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
 196 struct ist_info ist_info;
 197 EXPORT_SYMBOL(ist_info);
 198 #else
 199 struct ist_info ist_info;
 200 #endif
 201
 202 #else
 203 struct cpuinfo_x86 boot_cpu_data __read_mostly = {
 204         .x86_phys_bits = MAX_PHYSMEM_BITS,
 205 };
 206 EXPORT_SYMBOL(boot_cpu_data);
 207 #endif
 208
 209
 210 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
 211 __visible unsigned long mmu_cr4_features;
 212 #else
 213 __visible unsigned long mmu_cr4_features = X86_CR4_PAE;
 214 #endif
 215
 216 /* Boot loader ID and version as integers, for the benefit of proc_dointvec */
 217 int bootloader_type, bootloader_version;
 218
 219 /*
 220  * Setup options
 221  */
 222 struct screen_info screen_info;
 223 EXPORT_SYMBOL(screen_info);
 224 struct edid_info edid_info;
 225 EXPORT_SYMBOL_GPL(edid_info);
 226
 227 extern int root_mountflags;
 228
 229 unsigned long saved_video_mode;
 230
 231 #define RAMDISK_IMAGE_START_MASK        0x07FF
 232 #define RAMDISK_PROMPT_FLAG             0x8000
 233 #define RAMDISK_LOAD_FLAG               0x4000
 234
 235 static char __initdata command_line[COMMAND_LINE_SIZE];
 236 #ifdef CONFIG_CMDLINE_BOOL
 237 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
 238 #endif
 239
 240 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
 241 struct edd edd;
 242 #ifdef CONFIG_EDD_MODULE
 243 EXPORT_SYMBOL(edd);
 244 #endif
 245 /**
 246  * copy_edd() - Copy the BIOS EDD information
 247  *              from boot_params into a safe place.
 248  *
 249  */
 250 static inline void __init copy_edd(void)
 251 {
 252      memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
 253             sizeof(edd.mbr_signature));
 254      memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
 255      edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
 256      edd.edd_info_nr = boot_params.eddbuf_entries;
 257 }
 258 #else
 259 static inline void __init copy_edd(void)
 260 {
 261 }
 262 #endif
 263
 264 void * __init extend_brk(size_t size, size_t align)
 265 {
 266         size_t mask = align - 1;
 267         void *ret;
 268
 269         BUG_ON(_brk_start == 0);
 270         BUG_ON(align & mask);
 271
 272         _brk_end = (_brk_end + mask) & ~mask;
 273         BUG_ON((char *)(_brk_end + size) > __brk_limit);
 274
 275         ret = (void *)_brk_end;
 276         _brk_end += size;
 277
 278         memset(ret, 0, size);
 279
 280         return ret;
 281 }
 282
 283 #ifdef CONFIG_X86_32
 284 static void __init cleanup_highmap(void)
 285 {
 286 }
 287 #endif
 288
 289 static void __init reserve_brk(void)
 290 {
 291         if (_brk_end > _brk_start)
 292                 memblock_reserve(__pa_symbol(_brk_start),
 293                                  _brk_end - _brk_start);
 294
 295         /* Mark brk area as locked down and no longer taking any
 296            new allocations */
 297         _brk_start = 0;
 298 }
 299
 300 u64 relocated_ramdisk;
 301
 302 #ifdef CONFIG_BLK_DEV_INITRD
 303
 304 static u64 __init get_ramdisk_image(void)
 305 {
 306         u64 ramdisk_image = boot_params.hdr.ramdisk_image;
 307
 308         ramdisk_image |= (u64)boot_params.ext_ramdisk_image << 32;
 309
 310         return ramdisk_image;
 311 }
 312 static u64 __init get_ramdisk_size(void)
 313 {
 314         u64 ramdisk_size = boot_params.hdr.ramdisk_size;
 315
 316         ramdisk_size |= (u64)boot_params.ext_ramdisk_size << 32;
 317
 318         return ramdisk_size;
 319 }
 320
 321 static void __init relocate_initrd(void)
 322 {
 323         /* Assume only end is not page aligned */
 324         u64 ramdisk_image = get_ramdisk_image();
 325         u64 ramdisk_size  = get_ramdisk_size();
 326         u64 area_size     = PAGE_ALIGN(ramdisk_size);
 327
 328         /* We need to move the initrd down into directly mapped mem */
 329         relocated_ramdisk = memblock_find_in_range(0, PFN_PHYS(max_pfn_mapped),
 330                                                    area_size, PAGE_SIZE);
 331
 332         if (!relocated_ramdisk)
 333                 panic("Cannot find place for new RAMDISK of size %lld\n",
 334                       ramdisk_size);
 335
 336         /* Note: this includes all the mem currently occupied by
 337            the initrd, we rely on that fact to keep the data intact. */
 338         memblock_reserve(relocated_ramdisk, area_size);
 339         initrd_start = relocated_ramdisk + PAGE_OFFSET;
 340         initrd_end   = initrd_start + ramdisk_size;
 341         printk(KERN_INFO "Allocated new RAMDISK: [mem %#010llx-%#010llx]\n",
 342                relocated_ramdisk, relocated_ramdisk + ramdisk_size - 1);
 343
 344         copy_from_early_mem((void *)initrd_start, ramdisk_image, ramdisk_size);
 345
 346         printk(KERN_INFO "Move RAMDISK from [mem %#010llx-%#010llx] to"
 347                 " [mem %#010llx-%#010llx]\n",
 348                 ramdisk_image, ramdisk_image + ramdisk_size - 1,
 349                 relocated_ramdisk, relocated_ramdisk + ramdisk_size - 1);
 350 }
 351
 352 static void __init early_reserve_initrd(void)
 353 {
 354         /* Assume only end is not page aligned */
 355         u64 ramdisk_image = get_ramdisk_image();
 356         u64 ramdisk_size  = get_ramdisk_size();
 357         u64 ramdisk_end   = PAGE_ALIGN(ramdisk_image + ramdisk_size);
 358
 359         if (!boot_params.hdr.type_of_loader ||
 360             !ramdisk_image || !ramdisk_size)
 361                 return;         /* No initrd provided by bootloader */
 362
 363         memblock_reserve(ramdisk_image, ramdisk_end - ramdisk_image);
 364 }
 365 static void __init reserve_initrd(void)
 366 {
 367         /* Assume only end is not page aligned */
 368         u64 ramdisk_image = get_ramdisk_image();
 369         u64 ramdisk_size  = get_ramdisk_size();
 370         u64 ramdisk_end   = PAGE_ALIGN(ramdisk_image + ramdisk_size);
 371         u64 mapped_size;
 372
 373         if (!boot_params.hdr.type_of_loader ||
 374             !ramdisk_image || !ramdisk_size)
 375                 return;         /* No initrd provided by bootloader */
 376
 377         initrd_start = 0;
 378
 379         mapped_size = memblock_mem_size(max_pfn_mapped);
 380         if (ramdisk_size >= (mapped_size>>1))
 381                 panic("initrd too large to handle, "
 382                        "disabling initrd (%lld needed, %lld available)\n",
 383                        ramdisk_size, mapped_size>>1);
 384
 385         printk(KERN_INFO "RAMDISK: [mem %#010llx-%#010llx]\n", ramdisk_image,
 386                         ramdisk_end - 1);
 387
 388         if (pfn_range_is_mapped(PFN_DOWN(ramdisk_image),
 389                                 PFN_DOWN(ramdisk_end))) {
 390                 /* All are mapped, easy case */
 391                 initrd_start = ramdisk_image + PAGE_OFFSET;
 392                 initrd_end = initrd_start + ramdisk_size;
 393                 return;
 394         }
 395
 396         relocate_initrd();
 397
 398         memblock_free(ramdisk_image, ramdisk_end - ramdisk_image);
 399 }
 400 #else
 401 static void __init early_reserve_initrd(void)
 402 {
 403 }
 404 static void __init reserve_initrd(void)
 405 {
 406 }
 407 #endif /* CONFIG_BLK_DEV_INITRD */
 408
 409 static void __init parse_setup_data(void)
 410 {
 411         struct setup_data *data;
 412         u64 pa_data, pa_next;
 413
 414         pa_data = boot_params.hdr.setup_data;
 415         while (pa_data) {
 416                 u32 data_len, data_type;
 417
 418                 data = early_memremap(pa_data, sizeof(*data));
 419                 data_len = data->len + sizeof(struct setup_data);
 420                 data_type = data->type;
 421                 pa_next = data->next;
 422                 early_memunmap(data, sizeof(*data));
 423
 424                 switch (data_type) {
 425                 case SETUP_E820_EXT:
 426                         parse_e820_ext(pa_data, data_len);
 427                         break;
 428                 case SETUP_DTB:
 429                         add_dtb(pa_data);
 430                         break;
 431                 case SETUP_EFI:
 432                         parse_efi_setup(pa_data, data_len);
 433                         break;
 434                 default:
 435                         break;
 436                 }
 437                 pa_data = pa_next;
 438         }
 439 }
 440
 441 static void __init e820_reserve_setup_data(void)
 442 {
 443         struct setup_data *data;
 444         u64 pa_data;
 445
 446         pa_data = boot_params.hdr.setup_data;
 447         if (!pa_data)
 448                 return;
 449
 450         while (pa_data) {
 451                 data = early_memremap(pa_data, sizeof(*data));
 452                 e820_update_range(pa_data, sizeof(*data)+data->len,
 453                          E820_RAM, E820_RESERVED_KERN);
 454                 pa_data = data->next;
 455                 early_memunmap(data, sizeof(*data));
 456         }
 457
 458         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 459         memcpy(&e820_saved, &e820, sizeof(struct e820map));
 460         printk(KERN_INFO "extended physical RAM map:\n");
 461         e820_print_map("reserve setup_data");
 462 }
 463
 464 static void __init memblock_x86_reserve_range_setup_data(void)
 465 {
 466         struct setup_data *data;
 467         u64 pa_data;
 468
 469         pa_data = boot_params.hdr.setup_data;
 470         while (pa_data) {
 471                 data = early_memremap(pa_data, sizeof(*data));
 472                 memblock_reserve(pa_data, sizeof(*data) + data->len);
 473                 pa_data = data->next;
 474                 early_memunmap(data, sizeof(*data));
 475         }
 476 }
 477
 478 /*
 479  * --------- Crashkernel reservation ------------------------------
 480  */
 481
 482 #ifdef CONFIG_KEXEC_CORE
 483
 484 /* 16M alignment for crash kernel regions */
 485 #define CRASH_ALIGN             (16 << 20)
 486
 487 /*
 488  * Keep the crash kernel below this limit.  On 32 bits earlier kernels
 489  * would limit the kernel to the low 512 MiB due to mapping restrictions.
 490  * On 64bit, old kexec-tools need to under 896MiB.
 491  */
 492 #ifdef CONFIG_X86_32
 493 # define CRASH_ADDR_LOW_MAX     (512 << 20)
 494 # define CRASH_ADDR_HIGH_MAX    (512 << 20)
 495 #else
 496 # define CRASH_ADDR_LOW_MAX     (896UL << 20)
 497 # define CRASH_ADDR_HIGH_MAX    MAXMEM
 498 #endif
 499
 500 static int __init reserve_crashkernel_low(void)
 501 {
 502 #ifdef CONFIG_X86_64
 503         unsigned long long base, low_base = 0, low_size = 0;
 504         unsigned long total_low_mem;
 505         int ret;
 506
 507         total_low_mem = memblock_mem_size(1UL << (32 - PAGE_SHIFT));
 508
 509         /* crashkernel=Y,low */
 510         ret = parse_crashkernel_low(boot_command_line, total_low_mem, &low_size, &base);
 511         if (ret) {
 512                 /*
 513                  * two parts from lib/swiotlb.c:
 514                  * -swiotlb size: user-specified with swiotlb= or default.
 515                  *
 516                  * -swiotlb overflow buffer: now hardcoded to 32k. We round it
 517                  * to 8M for other buffers that may need to stay low too. Also
 518                  * make sure we allocate enough extra low memory so that we
 519                  * don't run out of DMA buffers for 32-bit devices.
 520                  */
 521                 low_size = max(swiotlb_size_or_default() + (8UL << 20), 256UL << 20);
 522         } else {
 523                 /* passed with crashkernel=0,low ? */
 524                 if (!low_size)
 525                         return 0;
 526         }
 527
 528         low_base = memblock_find_in_range(low_size, 1ULL << 32, low_size, CRASH_ALIGN);
 529         if (!low_base) {
 530                 pr_err("Cannot reserve %ldMB crashkernel low memory, please try smaller size.\n",
 531                        (unsigned long)(low_size >> 20));
 532                 return -ENOMEM;
 533         }
 534
 535         ret = memblock_reserve(low_base, low_size);
 536         if (ret) {
 537                 pr_err("%s: Error reserving crashkernel low memblock.\n", __func__);
 538                 return ret;
 539         }
 540
 541         pr_info("Reserving %ldMB of low memory at %ldMB for crashkernel (System low RAM: %ldMB)\n",
 542                 (unsigned long)(low_size >> 20),
 543                 (unsigned long)(low_base >> 20),
 544                 (unsigned long)(total_low_mem >> 20));
 545
 546         crashk_low_res.start = low_base;
 547         crashk_low_res.end   = low_base + low_size - 1;
 548         insert_resource(&iomem_resource, &crashk_low_res);
 549 #endif
 550         return 0;
 551 }
 552
 553 static void __init reserve_crashkernel(void)
 554 {
 555         unsigned long long crash_size, crash_base, total_mem;
 556         bool high = false;
 557         int ret;
 558
 559         total_mem = memblock_phys_mem_size();
 560
 561         /* crashkernel=XM */
 562         ret = parse_crashkernel(boot_command_line, total_mem, &crash_size, &crash_base);
 563         if (ret != 0 || crash_size <= 0) {
 564                 /* crashkernel=X,high */
 565                 ret = parse_crashkernel_high(boot_command_line, total_mem,
 566                                              &crash_size, &crash_base);
 567                 if (ret != 0 || crash_size <= 0)
 568                         return;
 569                 high = true;
 570         }
 571
 572         /* 0 means: find the address automatically */
 573         if (crash_base <= 0) {
 574                 /*
 575                  *  kexec want bzImage is below CRASH_KERNEL_ADDR_MAX
 576                  */
 577                 crash_base = memblock_find_in_range(CRASH_ALIGN,
 578                                                     high ? CRASH_ADDR_HIGH_MAX
 579                                                          : CRASH_ADDR_LOW_MAX,
 580                                                     crash_size, CRASH_ALIGN);
 581                 if (!crash_base) {
 582                         pr_info("crashkernel reservation failed - No suitable area found.\n");
 583                         return;
 584                 }
 585
 586         } else {
 587                 unsigned long long start;
 588
 589                 start = memblock_find_in_range(crash_base,
 590                                                crash_base + crash_size,
 591                                                crash_size, 1 << 20);
 592                 if (start != crash_base) {
 593                         pr_info("crashkernel reservation failed - memory is in use.\n");
 594                         return;
 595                 }
 596         }
 597         ret = memblock_reserve(crash_base, crash_size);
 598         if (ret) {
 599                 pr_err("%s: Error reserving crashkernel memblock.\n", __func__);
 600                 return;
 601         }
 602
 603         if (crash_base >= (1ULL << 32) && reserve_crashkernel_low()) {
 604                 memblock_free(crash_base, crash_size);
 605                 return;
 606         }
 607
 608         pr_info("Reserving %ldMB of memory at %ldMB for crashkernel (System RAM: %ldMB)\n",
 609                 (unsigned long)(crash_size >> 20),
 610                 (unsigned long)(crash_base >> 20),
 611                 (unsigned long)(total_mem >> 20));
 612
 613         crashk_res.start = crash_base;
 614         crashk_res.end   = crash_base + crash_size - 1;
 615         insert_resource(&iomem_resource, &crashk_res);
 616 }
 617 #else
 618 static void __init reserve_crashkernel(void)
 619 {
 620 }
 621 #endif
 622
 623 static struct resource standard_io_resources[] = {
 624         { .name = "dma1", .start = 0x00, .end = 0x1f,
 625                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 626         { .name = "pic1", .start = 0x20, .end = 0x21,
 627                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 628         { .name = "timer0", .start = 0x40, .end = 0x43,
 629                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 630         { .name = "timer1", .start = 0x50, .end = 0x53,
 631                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 632         { .name = "keyboard", .start = 0x60, .end = 0x60,
 633                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 634         { .name = "keyboard", .start = 0x64, .end = 0x64,
 635                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 636         { .name = "dma page reg", .start = 0x80, .end = 0x8f,
 637                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 638         { .name = "pic2", .start = 0xa0, .end = 0xa1,
 639                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 640         { .name = "dma2", .start = 0xc0, .end = 0xdf,
 641                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 642         { .name = "fpu", .start = 0xf0, .end = 0xff,
 643                 .flags = IORESOURCE_BUSY | IORESOURCE_IO }
 644 };
 645
 646 void __init reserve_standard_io_resources(void)
 647 {
 648         int i;
 649
 650         /* request I/O space for devices used on all i[345]86 PCs */
 651         for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
 652                 request_resource(&ioport_resource, &standard_io_resources[i]);
 653
 654 }
 655
 656 static __init void reserve_ibft_region(void)
 657 {
 658         unsigned long addr, size = 0;
 659
 660         addr = find_ibft_region(&size);
 661
 662         if (size)
 663                 memblock_reserve(addr, size);
 664 }
 665
 666 static bool __init snb_gfx_workaround_needed(void)
 667 {
 668 #ifdef CONFIG_PCI
 669         int i;
 670         u16 vendor, devid;
 671         static const __initconst u16 snb_ids[] = {
 672                 0x0102,
 673                 0x0112,
 674                 0x0122,
 675                 0x0106,
 676                 0x0116,
 677                 0x0126,
 678                 0x010a,
 679         };
 680
 681         /* Assume no if something weird is going on with PCI */
 682         if (!early_pci_allowed())
 683                 return false;
 684
 685         vendor = read_pci_config_16(0, 2, 0, PCI_VENDOR_ID);
 686         if (vendor != 0x8086)
 687                 return false;
 688
 689         devid = read_pci_config_16(0, 2, 0, PCI_DEVICE_ID);
 690         for (i = 0; i < ARRAY_SIZE(snb_ids); i++)
 691                 if (devid == snb_ids[i])
 692                         return true;
 693 #endif
 694
 695         return false;
 696 }
 697
 698 /*
 699  * Sandy Bridge graphics has trouble with certain ranges, exclude
 700  * them from allocation.
 701  */
 702 static void __init trim_snb_memory(void)
 703 {
 704         static const __initconst unsigned long bad_pages[] = {
 705                 0x20050000,
 706                 0x20110000,
 707                 0x20130000,
 708                 0x20138000,
 709                 0x40004000,
 710         };
 711         int i;
 712
 713         if (!snb_gfx_workaround_needed())
 714                 return;
 715
 716         printk(KERN_DEBUG "reserving inaccessible SNB gfx pages\n");
 717
 718         /*
 719          * Reserve all memory below the 1 MB mark that has not
 720          * already been reserved.
 721          */
 722         memblock_reserve(0, 1<<20);
 723
 724         for (i = 0; i < ARRAY_SIZE(bad_pages); i++) {
 725                 if (memblock_reserve(bad_pages[i], PAGE_SIZE))
 726                         printk(KERN_WARNING "failed to reserve 0x%08lx\n",
 727                                bad_pages[i]);
 728         }
 729 }
 730
 731 /*
 732  * Here we put platform-specific memory range workarounds, i.e.
 733  * memory known to be corrupt or otherwise in need to be reserved on
 734  * specific platforms.
 735  *
 736  * If this gets used more widely it could use a real dispatch mechanism.
 737  */
 738 static void __init trim_platform_memory_ranges(void)
 739 {
 740         trim_snb_memory();
 741 }
 742
 743 static void __init trim_bios_range(void)
 744 {
 745         /*
 746          * A special case is the first 4Kb of memory;
 747          * This is a BIOS owned area, not kernel ram, but generally
 748          * not listed as such in the E820 table.
 749          *
 750          * This typically reserves additional memory (64KiB by default)
 751          * since some BIOSes are known to corrupt low memory.  See the
 752          * Kconfig help text for X86_RESERVE_LOW.
 753          */
 754         e820_update_range(0, PAGE_SIZE, E820_RAM, E820_RESERVED);
 755
 756         /*
 757          * special case: Some BIOSen report the PC BIOS
 758          * area (640->1Mb) as ram even though it is not.
 759          * take them out.
 760          */
 761         e820_remove_range(BIOS_BEGIN, BIOS_END - BIOS_BEGIN, E820_RAM, 1);
 762
 763         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 764 }
 765
 766 /* called before trim_bios_range() to spare extra sanitize */
 767 static void __init e820_add_kernel_range(void)
 768 {
 769         u64 start = __pa_symbol(_text);
 770         u64 size = __pa_symbol(_end) - start;
 771
 772         /*
 773          * Complain if .text .data and .bss are not marked as E820_RAM and
 774          * attempt to fix it by adding the range. We may have a confused BIOS,
 775          * or the user may have used memmap=exactmap or memmap=xxM$yyM to
 776          * exclude kernel range. If we really are running on top non-RAM,
 777          * we will crash later anyways.
 778          */
 779         if (e820_all_mapped(start, start + size, E820_RAM))
 780                 return;
 781
 782         pr_warn(".text .data .bss are not marked as E820_RAM!\n");
 783         e820_remove_range(start, size, E820_RAM, 0);
 784         e820_add_region(start, size, E820_RAM);
 785 }
 786
 787 static unsigned reserve_low = CONFIG_X86_RESERVE_LOW << 10;
 788
 789 static int __init parse_reservelow(char *p)
 790 {
 791         unsigned long long size;
 792
 793         if (!p)
 794                 return -EINVAL;
 795
 796         size = memparse(p, &p);
 797
 798         if (size < 4096)
 799                 size = 4096;
 800
 801         if (size > 640*1024)
 802                 size = 640*1024;
 803
 804         reserve_low = size;
 805
 806         return 0;
 807 }
 808
 809 early_param("reservelow", parse_reservelow);
 810
 811 static void __init trim_low_memory_range(void)
 812 {
 813         memblock_reserve(0, ALIGN(reserve_low, PAGE_SIZE));
 814 }
 815
 816 /*
 817  * Dump out kernel offset information on panic.
 818  */
 819 static int
 820 dump_kernel_offset(struct notifier_block *self, unsigned long v, void *p)
 821 {
 822         if (kaslr_enabled()) {
 823                 pr_emerg("Kernel Offset: 0x%lx from 0x%lx (relocation range: 0x%lx-0x%lx)\n",
 824                          kaslr_offset(),
 825                          __START_KERNEL,
 826                          __START_KERNEL_map,
 827                          MODULES_VADDR-1);
 828         } else {
 829                 pr_emerg("Kernel Offset: disabled\n");
 830         }
 831
 832         return 0;
 833 }
 834
 835 /*
 836  * Determine if we were loaded by an EFI loader.  If so, then we have also been
 837  * passed the efi memmap, systab, etc., so we should use these data structures
 838  * for initialization.  Note, the efi init code path is determined by the
 839  * global efi_enabled. This allows the same kernel image to be used on existing
 840  * systems (with a traditional BIOS) as well as on EFI systems.
 841  */
 842 /*
 843  * setup_arch - architecture-specific boot-time initializations
 844  *
 845  * Note: On x86_64, fixmaps are ready for use even before this is called.
 846  */
 847
 848 void __init setup_arch(char **cmdline_p)
 849 {
 850         memblock_reserve(__pa_symbol(_text),
 851                          (unsigned long)__bss_stop - (unsigned long)_text);
 852
 853         early_reserve_initrd();
 854
 855         /*
 856          * At this point everything still needed from the boot loader
 857          * or BIOS or kernel text should be early reserved or marked not
 858          * RAM in e820. All other memory is free game.
 859          */
 860
 861 #ifdef CONFIG_X86_32
 862         memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
 863
 864         /*
 865          * copy kernel address range established so far and switch
 866          * to the proper swapper page table
 867          */
 868         clone_pgd_range(swapper_pg_dir     + KERNEL_PGD_BOUNDARY,
 869                         initial_page_table + KERNEL_PGD_BOUNDARY,
 870                         KERNEL_PGD_PTRS);
 871
 872         load_cr3(swapper_pg_dir);
 873         /*
 874          * Note: Quark X1000 CPUs advertise PGE incorrectly and require
 875          * a cr3 based tlb flush, so the following __flush_tlb_all()
 876          * will not flush anything because the cpu quirk which clears
 877          * X86_FEATURE_PGE has not been invoked yet. Though due to the
 878          * load_cr3() above the TLB has been flushed already. The
 879          * quirk is invoked before subsequent calls to __flush_tlb_all()
 880          * so proper operation is guaranteed.
 881          */
 882         __flush_tlb_all();
 883 #else
 884         printk(KERN_INFO "Command line: %s\n", boot_command_line);
 885 #endif
 886
 887         /*
 888          * If we have OLPC OFW, we might end up relocating the fixmap due to
 889          * reserve_top(), so do this before touching the ioremap area.
 890          */
 891         olpc_ofw_detect();
 892
 893         early_trap_init();
 894         early_cpu_init();
 895         early_ioremap_init();
 896
 897         setup_olpc_ofw_pgd();
 898
 899         ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
 900         screen_info = boot_params.screen_info;
 901         edid_info = boot_params.edid_info;
 902 #ifdef CONFIG_X86_32
 903         apm_info.bios = boot_params.apm_bios_info;
 904         ist_info = boot_params.ist_info;
 905 #endif
 906         saved_video_mode = boot_params.hdr.vid_mode;
 907         bootloader_type = boot_params.hdr.type_of_loader;
 908         if ((bootloader_type >> 4) == 0xe) {
 909                 bootloader_type &= 0xf;
 910                 bootloader_type |= (boot_params.hdr.ext_loader_type+0x10) << 4;
 911         }
 912         bootloader_version  = bootloader_type & 0xf;
 913         bootloader_version |= boot_params.hdr.ext_loader_ver << 4;
 914
 915 #ifdef CONFIG_BLK_DEV_RAM
 916         rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
 917         rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
 918         rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
 919 #endif
 920 #ifdef CONFIG_EFI
 921         if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
 922                      EFI32_LOADER_SIGNATURE, 4)) {
 923                 set_bit(EFI_BOOT, &efi.flags);
 924         } else if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
 925                      EFI64_LOADER_SIGNATURE, 4)) {
 926                 set_bit(EFI_BOOT, &efi.flags);
 927                 set_bit(EFI_64BIT, &efi.flags);
 928         }
 929
 930         if (efi_enabled(EFI_BOOT))
 931                 efi_memblock_x86_reserve_range();
 932 #endif
 933
 934         x86_init.oem.arch_setup();
 935
 936         iomem_resource.end = (1ULL << boot_cpu_data.x86_phys_bits) - 1;
 937         setup_memory_map();
 938         parse_setup_data();
 939
 940         copy_edd();
 941
 942         if (!boot_params.hdr.root_flags)
 943                 root_mountflags &= ~MS_RDONLY;
 944         init_mm.start_code = (unsigned long) _text;
 945         init_mm.end_code = (unsigned long) _etext;
 946         init_mm.end_data = (unsigned long) _edata;
 947         init_mm.brk = _brk_end;
 948
 949         mpx_mm_init(&init_mm);
 950
 951         code_resource.start = __pa_symbol(_text);
 952         code_resource.end = __pa_symbol(_etext)-1;
 953         data_resource.start = __pa_symbol(_etext);
 954         data_resource.end = __pa_symbol(_edata)-1;
 955         bss_resource.start = __pa_symbol(__bss_start);
 956         bss_resource.end = __pa_symbol(__bss_stop)-1;
 957
 958 #ifdef CONFIG_CMDLINE_BOOL
 959 #ifdef CONFIG_CMDLINE_OVERRIDE
 960         strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 961 #else
 962         if (builtin_cmdline[0]) {
 963                 /* append boot loader cmdline to builtin */
 964                 strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE);
 965                 strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE);
 966                 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 967         }
 968 #endif
 969 #endif
 970
 971         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 972         *cmdline_p = command_line;
 973
 974         /*
 975          * x86_configure_nx() is called before parse_early_param() to detect
 976          * whether hardware doesn't support NX (so that the early EHCI debug
 977          * console setup can safely call set_fixmap()). It may then be called
 978          * again from within noexec_setup() during parsing early parameters
 979          * to honor the respective command line option.
 980          */
 981         x86_configure_nx();
 982
 983         parse_early_param();
 984
 985         x86_report_nx();
 986
 987         /* after early param, so could get panic from serial */
 988         memblock_x86_reserve_range_setup_data();
 989
 990         if (acpi_mps_check()) {
 991 #ifdef CONFIG_X86_LOCAL_APIC
 992                 disable_apic = 1;
 993 #endif
 994                 setup_clear_cpu_cap(X86_FEATURE_APIC);
 995         }
 996
 997 #ifdef CONFIG_PCI
 998         if (pci_early_dump_regs)
 999                 early_dump_pci_devices();
1000 #endif
1001
1002         /* update the e820_saved too */
1003         e820_reserve_setup_data();
1004         finish_e820_parsing();
1005
1006         if (efi_enabled(EFI_BOOT))
1007                 efi_init();
1008
1009         dmi_scan_machine();
1010         dmi_memdev_walk();
1011         dmi_set_dump_stack_arch_desc();
1012
1013         /*
1014          * VMware detection requires dmi to be available, so this
1015          * needs to be done after dmi_scan_machine, for the BP.
1016          */
1017         init_hypervisor_platform();
1018
1019         x86_init.resources.probe_roms();
1020
1021         /* after parse_early_param, so could debug it */
1022         insert_resource(&iomem_resource, &code_resource);
1023         insert_resource(&iomem_resource, &data_resource);
1024         insert_resource(&iomem_resource, &bss_resource);
1025
1026         e820_add_kernel_range();
1027         trim_bios_range();
1028 #ifdef CONFIG_X86_32
1029         if (ppro_with_ram_bug()) {
1030                 e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM,
1031                                   E820_RESERVED);
1032                 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
1033                 printk(KERN_INFO "fixed physical RAM map:\n");
1034                 e820_print_map("bad_ppro");
1035         }
1036 #else
1037         early_gart_iommu_check();
1038 #endif
1039
1040         /*
1041          * partially used pages are not usable - thus
1042          * we are rounding upwards:
1043          */
1044         max_pfn = e820_end_of_ram_pfn();
1045
1046         /* update e820 for memory not covered by WB MTRRs */
1047         mtrr_bp_init();
1048         if (mtrr_trim_uncached_memory(max_pfn))
1049                 max_pfn = e820_end_of_ram_pfn();
1050
1051         max_possible_pfn = max_pfn;
1052
1053 #ifdef CONFIG_X86_32
1054         /* max_low_pfn get updated here */
1055         find_low_pfn_range();
1056 #else
1057         check_x2apic();
1058
1059         /* How many end-of-memory variables you have, grandma! */
1060         /* need this before calling reserve_initrd */
1061         if (max_pfn > (1UL<<(32 - PAGE_SHIFT)))
1062                 max_low_pfn = e820_end_of_low_ram_pfn();
1063         else
1064                 max_low_pfn = max_pfn;
1065
1066         high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
1067 #endif
1068
1069         /*
1070          * Find and reserve possible boot-time SMP configuration:
1071          */
1072         find_smp_config();
1073
1074         reserve_ibft_region();
1075
1076         early_alloc_pgt_buf();
1077
1078         /*
1079          * Need to conclude brk, before memblock_x86_fill()
1080          *  it could use memblock_find_in_range, could overlap with
1081          *  brk area.
1082          */
1083         reserve_brk();
1084
1085         cleanup_highmap();
1086
1087         memblock_set_current_limit(ISA_END_ADDRESS);
1088         memblock_x86_fill();
1089
1090         if (efi_enabled(EFI_BOOT)) {
1091                 efi_fake_memmap();
1092                 efi_find_mirror();
1093         }
1094
1095         /*
1096          * The EFI specification says that boot service code won't be called
1097          * after ExitBootServices(). This is, in fact, a lie.
1098          */
1099         if (efi_enabled(EFI_MEMMAP))
1100                 efi_reserve_boot_services();
1101
1102         /* preallocate 4k for mptable mpc */
1103         early_reserve_e820_mpc_new();
1104
1105 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
1106         setup_bios_corruption_check();
1107 #endif
1108
1109 #ifdef CONFIG_X86_32
1110         printk(KERN_DEBUG "initial memory mapped: [mem 0x00000000-%#010lx]\n",
1111                         (max_pfn_mapped<<PAGE_SHIFT) - 1);
1112 #endif
1113
1114         reserve_real_mode();
1115
1116         trim_platform_memory_ranges();
1117         trim_low_memory_range();
1118
1119         init_mem_mapping();
1120
1121         early_trap_pf_init();
1122
1123         setup_real_mode();
1124
1125         memblock_set_current_limit(get_max_mapped());
1126
1127         /*
1128          * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
1129          */
1130
1131 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
1132         if (init_ohci1394_dma_early)
1133                 init_ohci1394_dma_on_all_controllers();
1134 #endif
1135         /* Allocate bigger log buffer */
1136         setup_log_buf(1);
1137
1138         reserve_initrd();
1139
1140 #if defined(CONFIG_ACPI) && defined(CONFIG_BLK_DEV_INITRD)
1141         acpi_initrd_override((void *)initrd_start, initrd_end - initrd_start);
1142 #endif
1143
1144         vsmp_init();
1145
1146         io_delay_init();
1147
1148         /*
1149          * Parse the ACPI tables for possible boot-time SMP configuration.
1150          */
1151         acpi_boot_table_init();
1152
1153         early_acpi_boot_init();
1154
1155         initmem_init();
1156         dma_contiguous_reserve(max_pfn_mapped << PAGE_SHIFT);
1157
1158         /*
1159          * Reserve memory for crash kernel after SRAT is parsed so that it
1160          * won't consume hotpluggable memory.
1161          */
1162         reserve_crashkernel();
1163
1164         memblock_find_dma_reserve();
1165
1166 #ifdef CONFIG_KVM_GUEST
1167         kvmclock_init();
1168 #endif
1169
1170         x86_init.paging.pagetable_init();
1171
1172         kasan_init();
1173
1174         if (boot_cpu_data.cpuid_level >= 0) {
1175                 /* A CPU has %cr4 if and only if it has CPUID */
1176                 mmu_cr4_features = __read_cr4();
1177                 if (trampoline_cr4_features)
1178                         *trampoline_cr4_features = mmu_cr4_features;
1179         }
1180
1181 #ifdef CONFIG_X86_32
1182         /* sync back kernel address range */
1183         clone_pgd_range(initial_page_table + KERNEL_PGD_BOUNDARY,
1184                         swapper_pg_dir     + KERNEL_PGD_BOUNDARY,
1185                         KERNEL_PGD_PTRS);
1186
1187         /*
1188          * sync back low identity map too.  It is used for example
1189          * in the 32-bit EFI stub.
1190          */
1191         clone_pgd_range(initial_page_table,
1192                         swapper_pg_dir     + KERNEL_PGD_BOUNDARY,
1193                         min(KERNEL_PGD_PTRS, KERNEL_PGD_BOUNDARY));
1194 #endif
1195
1196         tboot_probe();
1197
1198         map_vsyscall();
1199
1200         generic_apic_probe();
1201
1202         early_quirks();
1203
1204         /*
1205          * Read APIC and some other early information from ACPI tables.
1206          */
1207         acpi_boot_init();
1208         sfi_init();
1209         x86_dtb_init();
1210
1211         /*
1212          * get boot-time SMP configuration:
1213          */
1214         if (smp_found_config)
1215                 get_smp_config();
1216
1217         prefill_possible_map();
1218
1219         init_cpu_to_node();
1220
1221         init_apic_mappings();
1222         io_apic_init_mappings();
1223
1224         kvm_guest_init();
1225
1226         e820_reserve_resources();
1227         e820_mark_nosave_regions(max_low_pfn);
1228
1229         x86_init.resources.reserve_resources();
1230
1231         e820_setup_gap();
1232
1233 #ifdef CONFIG_VT
1234 #if defined(CONFIG_VGA_CONSOLE)
1235         if (!efi_enabled(EFI_BOOT) || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
1236                 conswitchp = &vga_con;
1237 #elif defined(CONFIG_DUMMY_CONSOLE)
1238         conswitchp = &dummy_con;
1239 #endif
1240 #endif
1241         x86_init.oem.banner();
1242
1243         x86_init.timers.wallclock_init();
1244
1245         mcheck_init();
1246
1247         arch_init_ideal_nops();
1248
1249         register_refined_jiffies(CLOCK_TICK_RATE);
1250
1251 #ifdef CONFIG_EFI
1252         if (efi_enabled(EFI_BOOT))
1253                 efi_apply_memmap_quirks();
1254 #endif
1255 }
1256
1257 #ifdef CONFIG_X86_32
1258
1259 static struct resource video_ram_resource = {
1260         .name   = "Video RAM area",
1261         .start  = 0xa0000,
1262         .end    = 0xbffff,
1263         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
1264 };
1265
1266 void __init i386_reserve_resources(void)
1267 {
1268         request_resource(&iomem_resource, &video_ram_resource);
1269         reserve_standard_io_resources();
1270 }
1271
1272 #endif /* CONFIG_X86_32 */
1273
1274 static struct notifier_block kernel_offset_notifier = {
1275         .notifier_call = dump_kernel_offset
1276 };
1277
1278 static int __init register_kernel_offset_dumper(void)
1279 {
1280         atomic_notifier_chain_register(&panic_notifier_list,
1281                                         &kernel_offset_notifier);
1282         return 0;
1283 }
1284 __initcall(register_kernel_offset_dumper);