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/export.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 #include <linux/mem_encrypt.h>
  73
  74 #include <linux/usb/xhci-dbgp.h>
  75 #include <video/edid.h>
  76
  77 #include <asm/mtrr.h>
  78 #include <asm/apic.h>
  79 #include <asm/realmode.h>
  80 #include <asm/e820/api.h>
  81 #include <asm/mpspec.h>
  82 #include <asm/setup.h>
  83 #include <asm/efi.h>
  84 #include <asm/timer.h>
  85 #include <asm/i8259.h>
  86 #include <asm/sections.h>
  87 #include <asm/io_apic.h>
  88 #include <asm/ist.h>
  89 #include <asm/setup_arch.h>
  90 #include <asm/bios_ebda.h>
  91 #include <asm/cacheflush.h>
  92 #include <asm/processor.h>
  93 #include <asm/bugs.h>
  94 #include <asm/kasan.h>
  95
  96 #include <asm/vsyscall.h>
  97 #include <asm/cpu.h>
  98 #include <asm/desc.h>
  99 #include <asm/dma.h>
 100 #include <asm/iommu.h>
 101 #include <asm/gart.h>
 102 #include <asm/mmu_context.h>
 103 #include <asm/proto.h>
 104
 105 #include <asm/paravirt.h>
 106 #include <asm/hypervisor.h>
 107 #include <asm/olpc_ofw.h>
 108
 109 #include <asm/percpu.h>
 110 #include <asm/topology.h>
 111 #include <asm/apicdef.h>
 112 #include <asm/amd_nb.h>
 113 #include <asm/mce.h>
 114 #include <asm/alternative.h>
 115 #include <asm/prom.h>
 116 #include <asm/microcode.h>
 117 #include <asm/mmu_context.h>
 118 #include <asm/kaslr.h>
 119 #include <asm/unwind.h>
 120
 121 /*
 122  * max_low_pfn_mapped: highest direct mapped pfn under 4GB
 123  * max_pfn_mapped:     highest direct mapped pfn over 4GB
 124  *
 125  * The direct mapping only covers E820_TYPE_RAM regions, so the ranges and gaps are
 126  * represented by pfn_mapped
 127  */
 128 unsigned long max_low_pfn_mapped;
 129 unsigned long max_pfn_mapped;
 130
 131 #ifdef CONFIG_DMI
 132 RESERVE_BRK(dmi_alloc, 65536);
 133 #endif
 134
 135
 136 static __initdata unsigned long _brk_start = (unsigned long)__brk_base;
 137 unsigned long _brk_end = (unsigned long)__brk_base;
 138
 139 #ifdef CONFIG_X86_64
 140 int default_cpu_present_to_apicid(int mps_cpu)
 141 {
 142         return __default_cpu_present_to_apicid(mps_cpu);
 143 }
 144
 145 int default_check_phys_apicid_present(int phys_apicid)
 146 {
 147         return __default_check_phys_apicid_present(phys_apicid);
 148 }
 149 #endif
 150
 151 struct boot_params boot_params;
 152
 153 /*
 154  * Machine setup..
 155  */
 156 static struct resource data_resource = {
 157         .name   = "Kernel data",
 158         .start  = 0,
 159         .end    = 0,
 160         .flags  = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM
 161 };
 162
 163 static struct resource code_resource = {
 164         .name   = "Kernel code",
 165         .start  = 0,
 166         .end    = 0,
 167         .flags  = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM
 168 };
 169
 170 static struct resource bss_resource = {
 171         .name   = "Kernel bss",
 172         .start  = 0,
 173         .end    = 0,
 174         .flags  = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM
 175 };
 176
 177
 178 #ifdef CONFIG_X86_32
 179 /* cpu data as detected by the assembly code in head_32.S */
 180 struct cpuinfo_x86 new_cpu_data;
 181
 182 /* common cpu data for all cpus */
 183 struct cpuinfo_x86 boot_cpu_data __read_mostly;
 184 EXPORT_SYMBOL(boot_cpu_data);
 185
 186 unsigned int def_to_bigsmp;
 187
 188 /* for MCA, but anyone else can use it if they want */
 189 unsigned int machine_id;
 190 unsigned int machine_submodel_id;
 191 unsigned int BIOS_revision;
 192
 193 struct apm_info apm_info;
 194 EXPORT_SYMBOL(apm_info);
 195
 196 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
 197         defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
 198 struct ist_info ist_info;
 199 EXPORT_SYMBOL(ist_info);
 200 #else
 201 struct ist_info ist_info;
 202 #endif
 203
 204 #else
 205 struct cpuinfo_x86 boot_cpu_data __read_mostly = {
 206         .x86_phys_bits = MAX_PHYSMEM_BITS,
 207 };
 208 EXPORT_SYMBOL(boot_cpu_data);
 209 #endif
 210
 211
 212 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
 213 __visible unsigned long mmu_cr4_features __ro_after_init;
 214 #else
 215 __visible unsigned long mmu_cr4_features __ro_after_init = X86_CR4_PAE;
 216 #endif
 217
 218 /* Boot loader ID and version as integers, for the benefit of proc_dointvec */
 219 int bootloader_type, bootloader_version;
 220
 221 /*
 222  * Setup options
 223  */
 224 struct screen_info screen_info;
 225 EXPORT_SYMBOL(screen_info);
 226 struct edid_info edid_info;
 227 EXPORT_SYMBOL_GPL(edid_info);
 228
 229 extern int root_mountflags;
 230
 231 unsigned long saved_video_mode;
 232
 233 #define RAMDISK_IMAGE_START_MASK        0x07FF
 234 #define RAMDISK_PROMPT_FLAG             0x8000
 235 #define RAMDISK_LOAD_FLAG               0x4000
 236
 237 static char __initdata command_line[COMMAND_LINE_SIZE];
 238 #ifdef CONFIG_CMDLINE_BOOL
 239 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
 240 #endif
 241
 242 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
 243 struct edd edd;
 244 #ifdef CONFIG_EDD_MODULE
 245 EXPORT_SYMBOL(edd);
 246 #endif
 247 /**
 248  * copy_edd() - Copy the BIOS EDD information
 249  *              from boot_params into a safe place.
 250  *
 251  */
 252 static inline void __init copy_edd(void)
 253 {
 254      memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
 255             sizeof(edd.mbr_signature));
 256      memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
 257      edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
 258      edd.edd_info_nr = boot_params.eddbuf_entries;
 259 }
 260 #else
 261 static inline void __init copy_edd(void)
 262 {
 263 }
 264 #endif
 265
 266 void * __init extend_brk(size_t size, size_t align)
 267 {
 268         size_t mask = align - 1;
 269         void *ret;
 270
 271         BUG_ON(_brk_start == 0);
 272         BUG_ON(align & mask);
 273
 274         _brk_end = (_brk_end + mask) & ~mask;
 275         BUG_ON((char *)(_brk_end + size) > __brk_limit);
 276
 277         ret = (void *)_brk_end;
 278         _brk_end += size;
 279
 280         memset(ret, 0, size);
 281
 282         return ret;
 283 }
 284
 285 #ifdef CONFIG_X86_32
 286 static void __init cleanup_highmap(void)
 287 {
 288 }
 289 #endif
 290
 291 static void __init reserve_brk(void)
 292 {
 293         if (_brk_end > _brk_start)
 294                 memblock_reserve(__pa_symbol(_brk_start),
 295                                  _brk_end - _brk_start);
 296
 297         /* Mark brk area as locked down and no longer taking any
 298            new allocations */
 299         _brk_start = 0;
 300 }
 301
 302 u64 relocated_ramdisk;
 303
 304 #ifdef CONFIG_BLK_DEV_INITRD
 305
 306 static u64 __init get_ramdisk_image(void)
 307 {
 308         u64 ramdisk_image = boot_params.hdr.ramdisk_image;
 309
 310         ramdisk_image |= (u64)boot_params.ext_ramdisk_image << 32;
 311
 312         return ramdisk_image;
 313 }
 314 static u64 __init get_ramdisk_size(void)
 315 {
 316         u64 ramdisk_size = boot_params.hdr.ramdisk_size;
 317
 318         ramdisk_size |= (u64)boot_params.ext_ramdisk_size << 32;
 319
 320         return ramdisk_size;
 321 }
 322
 323 static void __init relocate_initrd(void)
 324 {
 325         /* Assume only end is not page aligned */
 326         u64 ramdisk_image = get_ramdisk_image();
 327         u64 ramdisk_size  = get_ramdisk_size();
 328         u64 area_size     = PAGE_ALIGN(ramdisk_size);
 329
 330         /* We need to move the initrd down into directly mapped mem */
 331         relocated_ramdisk = memblock_find_in_range(0, PFN_PHYS(max_pfn_mapped),
 332                                                    area_size, PAGE_SIZE);
 333
 334         if (!relocated_ramdisk)
 335                 panic("Cannot find place for new RAMDISK of size %lld\n",
 336                       ramdisk_size);
 337
 338         /* Note: this includes all the mem currently occupied by
 339            the initrd, we rely on that fact to keep the data intact. */
 340         memblock_reserve(relocated_ramdisk, area_size);
 341         initrd_start = relocated_ramdisk + PAGE_OFFSET;
 342         initrd_end   = initrd_start + ramdisk_size;
 343         printk(KERN_INFO "Allocated new RAMDISK: [mem %#010llx-%#010llx]\n",
 344                relocated_ramdisk, relocated_ramdisk + ramdisk_size - 1);
 345
 346         copy_from_early_mem((void *)initrd_start, ramdisk_image, ramdisk_size);
 347
 348         printk(KERN_INFO "Move RAMDISK from [mem %#010llx-%#010llx] to"
 349                 " [mem %#010llx-%#010llx]\n",
 350                 ramdisk_image, ramdisk_image + ramdisk_size - 1,
 351                 relocated_ramdisk, relocated_ramdisk + ramdisk_size - 1);
 352 }
 353
 354 static void __init early_reserve_initrd(void)
 355 {
 356         /* Assume only end is not page aligned */
 357         u64 ramdisk_image = get_ramdisk_image();
 358         u64 ramdisk_size  = get_ramdisk_size();
 359         u64 ramdisk_end   = PAGE_ALIGN(ramdisk_image + ramdisk_size);
 360
 361         if (!boot_params.hdr.type_of_loader ||
 362             !ramdisk_image || !ramdisk_size)
 363                 return;         /* No initrd provided by bootloader */
 364
 365         memblock_reserve(ramdisk_image, ramdisk_end - ramdisk_image);
 366 }
 367 static void __init reserve_initrd(void)
 368 {
 369         /* Assume only end is not page aligned */
 370         u64 ramdisk_image = get_ramdisk_image();
 371         u64 ramdisk_size  = get_ramdisk_size();
 372         u64 ramdisk_end   = PAGE_ALIGN(ramdisk_image + ramdisk_size);
 373         u64 mapped_size;
 374
 375         if (!boot_params.hdr.type_of_loader ||
 376             !ramdisk_image || !ramdisk_size)
 377                 return;         /* No initrd provided by bootloader */
 378
 379         initrd_start = 0;
 380
 381         mapped_size = memblock_mem_size(max_pfn_mapped);
 382         if (ramdisk_size >= (mapped_size>>1))
 383                 panic("initrd too large to handle, "
 384                        "disabling initrd (%lld needed, %lld available)\n",
 385                        ramdisk_size, mapped_size>>1);
 386
 387         printk(KERN_INFO "RAMDISK: [mem %#010llx-%#010llx]\n", ramdisk_image,
 388                         ramdisk_end - 1);
 389
 390         if (pfn_range_is_mapped(PFN_DOWN(ramdisk_image),
 391                                 PFN_DOWN(ramdisk_end))) {
 392                 /* All are mapped, easy case */
 393                 initrd_start = ramdisk_image + PAGE_OFFSET;
 394                 initrd_end = initrd_start + ramdisk_size;
 395                 return;
 396         }
 397
 398         relocate_initrd();
 399
 400         memblock_free(ramdisk_image, ramdisk_end - ramdisk_image);
 401 }
 402
 403 #else
 404 static void __init early_reserve_initrd(void)
 405 {
 406 }
 407 static void __init reserve_initrd(void)
 408 {
 409 }
 410 #endif /* CONFIG_BLK_DEV_INITRD */
 411
 412 static void __init parse_setup_data(void)
 413 {
 414         struct setup_data *data;
 415         u64 pa_data, pa_next;
 416
 417         pa_data = boot_params.hdr.setup_data;
 418         while (pa_data) {
 419                 u32 data_len, data_type;
 420
 421                 data = early_memremap(pa_data, sizeof(*data));
 422                 data_len = data->len + sizeof(struct setup_data);
 423                 data_type = data->type;
 424                 pa_next = data->next;
 425                 early_memunmap(data, sizeof(*data));
 426
 427                 switch (data_type) {
 428                 case SETUP_E820_EXT:
 429                         e820__memory_setup_extended(pa_data, data_len);
 430                         break;
 431                 case SETUP_DTB:
 432                         add_dtb(pa_data);
 433                         break;
 434                 case SETUP_EFI:
 435                         parse_efi_setup(pa_data, data_len);
 436                         break;
 437                 default:
 438                         break;
 439                 }
 440                 pa_data = pa_next;
 441         }
 442 }
 443
 444 static void __init memblock_x86_reserve_range_setup_data(void)
 445 {
 446         struct setup_data *data;
 447         u64 pa_data;
 448
 449         pa_data = boot_params.hdr.setup_data;
 450         while (pa_data) {
 451                 data = early_memremap(pa_data, sizeof(*data));
 452                 memblock_reserve(pa_data, sizeof(*data) + data->len);
 453                 pa_data = data->next;
 454                 early_memunmap(data, sizeof(*data));
 455         }
 456 }
 457
 458 /*
 459  * --------- Crashkernel reservation ------------------------------
 460  */
 461
 462 #ifdef CONFIG_KEXEC_CORE
 463
 464 /* 16M alignment for crash kernel regions */
 465 #define CRASH_ALIGN             (16 << 20)
 466
 467 /*
 468  * Keep the crash kernel below this limit.  On 32 bits earlier kernels
 469  * would limit the kernel to the low 512 MiB due to mapping restrictions.
 470  * On 64bit, old kexec-tools need to under 896MiB.
 471  */
 472 #ifdef CONFIG_X86_32
 473 # define CRASH_ADDR_LOW_MAX     (512 << 20)
 474 # define CRASH_ADDR_HIGH_MAX    (512 << 20)
 475 #else
 476 # define CRASH_ADDR_LOW_MAX     (896UL << 20)
 477 # define CRASH_ADDR_HIGH_MAX    MAXMEM
 478 #endif
 479
 480 static int __init reserve_crashkernel_low(void)
 481 {
 482 #ifdef CONFIG_X86_64
 483         unsigned long long base, low_base = 0, low_size = 0;
 484         unsigned long total_low_mem;
 485         int ret;
 486
 487         total_low_mem = memblock_mem_size(1UL << (32 - PAGE_SHIFT));
 488
 489         /* crashkernel=Y,low */
 490         ret = parse_crashkernel_low(boot_command_line, total_low_mem, &low_size, &base);
 491         if (ret) {
 492                 /*
 493                  * two parts from lib/swiotlb.c:
 494                  * -swiotlb size: user-specified with swiotlb= or default.
 495                  *
 496                  * -swiotlb overflow buffer: now hardcoded to 32k. We round it
 497                  * to 8M for other buffers that may need to stay low too. Also
 498                  * make sure we allocate enough extra low memory so that we
 499                  * don't run out of DMA buffers for 32-bit devices.
 500                  */
 501                 low_size = max(swiotlb_size_or_default() + (8UL << 20), 256UL << 20);
 502         } else {
 503                 /* passed with crashkernel=0,low ? */
 504                 if (!low_size)
 505                         return 0;
 506         }
 507
 508         low_base = memblock_find_in_range(0, 1ULL << 32, low_size, CRASH_ALIGN);
 509         if (!low_base) {
 510                 pr_err("Cannot reserve %ldMB crashkernel low memory, please try smaller size.\n",
 511                        (unsigned long)(low_size >> 20));
 512                 return -ENOMEM;
 513         }
 514
 515         ret = memblock_reserve(low_base, low_size);
 516         if (ret) {
 517                 pr_err("%s: Error reserving crashkernel low memblock.\n", __func__);
 518                 return ret;
 519         }
 520
 521         pr_info("Reserving %ldMB of low memory at %ldMB for crashkernel (System low RAM: %ldMB)\n",
 522                 (unsigned long)(low_size >> 20),
 523                 (unsigned long)(low_base >> 20),
 524                 (unsigned long)(total_low_mem >> 20));
 525
 526         crashk_low_res.start = low_base;
 527         crashk_low_res.end   = low_base + low_size - 1;
 528         insert_resource(&iomem_resource, &crashk_low_res);
 529 #endif
 530         return 0;
 531 }
 532
 533 static void __init reserve_crashkernel(void)
 534 {
 535         unsigned long long crash_size, crash_base, total_mem;
 536         bool high = false;
 537         int ret;
 538
 539         total_mem = memblock_phys_mem_size();
 540
 541         /* crashkernel=XM */
 542         ret = parse_crashkernel(boot_command_line, total_mem, &crash_size, &crash_base);
 543         if (ret != 0 || crash_size <= 0) {
 544                 /* crashkernel=X,high */
 545                 ret = parse_crashkernel_high(boot_command_line, total_mem,
 546                                              &crash_size, &crash_base);
 547                 if (ret != 0 || crash_size <= 0)
 548                         return;
 549                 high = true;
 550         }
 551
 552         /* 0 means: find the address automatically */
 553         if (crash_base <= 0) {
 554                 /*
 555                  * Set CRASH_ADDR_LOW_MAX upper bound for crash memory,
 556                  * as old kexec-tools loads bzImage below that, unless
 557                  * "crashkernel=size[KMG],high" is specified.
 558                  */
 559                 crash_base = memblock_find_in_range(CRASH_ALIGN,
 560                                                     high ? CRASH_ADDR_HIGH_MAX
 561                                                          : CRASH_ADDR_LOW_MAX,
 562                                                     crash_size, CRASH_ALIGN);
 563                 if (!crash_base) {
 564                         pr_info("crashkernel reservation failed - No suitable area found.\n");
 565                         return;
 566                 }
 567
 568         } else {
 569                 unsigned long long start;
 570
 571                 start = memblock_find_in_range(crash_base,
 572                                                crash_base + crash_size,
 573                                                crash_size, 1 << 20);
 574                 if (start != crash_base) {
 575                         pr_info("crashkernel reservation failed - memory is in use.\n");
 576                         return;
 577                 }
 578         }
 579         ret = memblock_reserve(crash_base, crash_size);
 580         if (ret) {
 581                 pr_err("%s: Error reserving crashkernel memblock.\n", __func__);
 582                 return;
 583         }
 584
 585         if (crash_base >= (1ULL << 32) && reserve_crashkernel_low()) {
 586                 memblock_free(crash_base, crash_size);
 587                 return;
 588         }
 589
 590         pr_info("Reserving %ldMB of memory at %ldMB for crashkernel (System RAM: %ldMB)\n",
 591                 (unsigned long)(crash_size >> 20),
 592                 (unsigned long)(crash_base >> 20),
 593                 (unsigned long)(total_mem >> 20));
 594
 595         crashk_res.start = crash_base;
 596         crashk_res.end   = crash_base + crash_size - 1;
 597         insert_resource(&iomem_resource, &crashk_res);
 598 }
 599 #else
 600 static void __init reserve_crashkernel(void)
 601 {
 602 }
 603 #endif
 604
 605 static struct resource standard_io_resources[] = {
 606         { .name = "dma1", .start = 0x00, .end = 0x1f,
 607                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 608         { .name = "pic1", .start = 0x20, .end = 0x21,
 609                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 610         { .name = "timer0", .start = 0x40, .end = 0x43,
 611                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 612         { .name = "timer1", .start = 0x50, .end = 0x53,
 613                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 614         { .name = "keyboard", .start = 0x60, .end = 0x60,
 615                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 616         { .name = "keyboard", .start = 0x64, .end = 0x64,
 617                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 618         { .name = "dma page reg", .start = 0x80, .end = 0x8f,
 619                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 620         { .name = "pic2", .start = 0xa0, .end = 0xa1,
 621                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 622         { .name = "dma2", .start = 0xc0, .end = 0xdf,
 623                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
 624         { .name = "fpu", .start = 0xf0, .end = 0xff,
 625                 .flags = IORESOURCE_BUSY | IORESOURCE_IO }
 626 };
 627
 628 void __init reserve_standard_io_resources(void)
 629 {
 630         int i;
 631
 632         /* request I/O space for devices used on all i[345]86 PCs */
 633         for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
 634                 request_resource(&ioport_resource, &standard_io_resources[i]);
 635
 636 }
 637
 638 static __init void reserve_ibft_region(void)
 639 {
 640         unsigned long addr, size = 0;
 641
 642         addr = find_ibft_region(&size);
 643
 644         if (size)
 645                 memblock_reserve(addr, size);
 646 }
 647
 648 static bool __init snb_gfx_workaround_needed(void)
 649 {
 650 #ifdef CONFIG_PCI
 651         int i;
 652         u16 vendor, devid;
 653         static const __initconst u16 snb_ids[] = {
 654                 0x0102,
 655                 0x0112,
 656                 0x0122,
 657                 0x0106,
 658                 0x0116,
 659                 0x0126,
 660                 0x010a,
 661         };
 662
 663         /* Assume no if something weird is going on with PCI */
 664         if (!early_pci_allowed())
 665                 return false;
 666
 667         vendor = read_pci_config_16(0, 2, 0, PCI_VENDOR_ID);
 668         if (vendor != 0x8086)
 669                 return false;
 670
 671         devid = read_pci_config_16(0, 2, 0, PCI_DEVICE_ID);
 672         for (i = 0; i < ARRAY_SIZE(snb_ids); i++)
 673                 if (devid == snb_ids[i])
 674                         return true;
 675 #endif
 676
 677         return false;
 678 }
 679
 680 /*
 681  * Sandy Bridge graphics has trouble with certain ranges, exclude
 682  * them from allocation.
 683  */
 684 static void __init trim_snb_memory(void)
 685 {
 686         static const __initconst unsigned long bad_pages[] = {
 687                 0x20050000,
 688                 0x20110000,
 689                 0x20130000,
 690                 0x20138000,
 691                 0x40004000,
 692         };
 693         int i;
 694
 695         if (!snb_gfx_workaround_needed())
 696                 return;
 697
 698         printk(KERN_DEBUG "reserving inaccessible SNB gfx pages\n");
 699
 700         /*
 701          * Reserve all memory below the 1 MB mark that has not
 702          * already been reserved.
 703          */
 704         memblock_reserve(0, 1<<20);
 705
 706         for (i = 0; i < ARRAY_SIZE(bad_pages); i++) {
 707                 if (memblock_reserve(bad_pages[i], PAGE_SIZE))
 708                         printk(KERN_WARNING "failed to reserve 0x%08lx\n",
 709                                bad_pages[i]);
 710         }
 711 }
 712
 713 /*
 714  * Here we put platform-specific memory range workarounds, i.e.
 715  * memory known to be corrupt or otherwise in need to be reserved on
 716  * specific platforms.
 717  *
 718  * If this gets used more widely it could use a real dispatch mechanism.
 719  */
 720 static void __init trim_platform_memory_ranges(void)
 721 {
 722         trim_snb_memory();
 723 }
 724
 725 static void __init trim_bios_range(void)
 726 {
 727         /*
 728          * A special case is the first 4Kb of memory;
 729          * This is a BIOS owned area, not kernel ram, but generally
 730          * not listed as such in the E820 table.
 731          *
 732          * This typically reserves additional memory (64KiB by default)
 733          * since some BIOSes are known to corrupt low memory.  See the
 734          * Kconfig help text for X86_RESERVE_LOW.
 735          */
 736         e820__range_update(0, PAGE_SIZE, E820_TYPE_RAM, E820_TYPE_RESERVED);
 737
 738         /*
 739          * special case: Some BIOSen report the PC BIOS
 740          * area (640->1Mb) as ram even though it is not.
 741          * take them out.
 742          */
 743         e820__range_remove(BIOS_BEGIN, BIOS_END - BIOS_BEGIN, E820_TYPE_RAM, 1);
 744
 745         e820__update_table(e820_table);
 746 }
 747
 748 /* called before trim_bios_range() to spare extra sanitize */
 749 static void __init e820_add_kernel_range(void)
 750 {
 751         u64 start = __pa_symbol(_text);
 752         u64 size = __pa_symbol(_end) - start;
 753
 754         /*
 755          * Complain if .text .data and .bss are not marked as E820_TYPE_RAM and
 756          * attempt to fix it by adding the range. We may have a confused BIOS,
 757          * or the user may have used memmap=exactmap or memmap=xxM$yyM to
 758          * exclude kernel range. If we really are running on top non-RAM,
 759          * we will crash later anyways.
 760          */
 761         if (e820__mapped_all(start, start + size, E820_TYPE_RAM))
 762                 return;
 763
 764         pr_warn(".text .data .bss are not marked as E820_TYPE_RAM!\n");
 765         e820__range_remove(start, size, E820_TYPE_RAM, 0);
 766         e820__range_add(start, size, E820_TYPE_RAM);
 767 }
 768
 769 static unsigned reserve_low = CONFIG_X86_RESERVE_LOW << 10;
 770
 771 static int __init parse_reservelow(char *p)
 772 {
 773         unsigned long long size;
 774
 775         if (!p)
 776                 return -EINVAL;
 777
 778         size = memparse(p, &p);
 779
 780         if (size < 4096)
 781                 size = 4096;
 782
 783         if (size > 640*1024)
 784                 size = 640*1024;
 785
 786         reserve_low = size;
 787
 788         return 0;
 789 }
 790
 791 early_param("reservelow", parse_reservelow);
 792
 793 static void __init trim_low_memory_range(void)
 794 {
 795         memblock_reserve(0, ALIGN(reserve_low, PAGE_SIZE));
 796 }
 797
 798 /*
 799  * Dump out kernel offset information on panic.
 800  */
 801 static int
 802 dump_kernel_offset(struct notifier_block *self, unsigned long v, void *p)
 803 {
 804         if (kaslr_enabled()) {
 805                 pr_emerg("Kernel Offset: 0x%lx from 0x%lx (relocation range: 0x%lx-0x%lx)\n",
 806                          kaslr_offset(),
 807                          __START_KERNEL,
 808                          __START_KERNEL_map,
 809                          MODULES_VADDR-1);
 810         } else {
 811                 pr_emerg("Kernel Offset: disabled\n");
 812         }
 813
 814         return 0;
 815 }
 816
 817 static void __init simple_udelay_calibration(void)
 818 {
 819         unsigned int tsc_khz, cpu_khz;
 820         unsigned long lpj;
 821
 822         if (!boot_cpu_has(X86_FEATURE_TSC))
 823                 return;
 824
 825         cpu_khz = x86_platform.calibrate_cpu();
 826         tsc_khz = x86_platform.calibrate_tsc();
 827
 828         tsc_khz = tsc_khz ? : cpu_khz;
 829         if (!tsc_khz)
 830                 return;
 831
 832         lpj = tsc_khz * 1000;
 833         do_div(lpj, HZ);
 834         loops_per_jiffy = lpj;
 835 }
 836
 837 /*
 838  * Determine if we were loaded by an EFI loader.  If so, then we have also been
 839  * passed the efi memmap, systab, etc., so we should use these data structures
 840  * for initialization.  Note, the efi init code path is determined by the
 841  * global efi_enabled. This allows the same kernel image to be used on existing
 842  * systems (with a traditional BIOS) as well as on EFI systems.
 843  */
 844 /*
 845  * setup_arch - architecture-specific boot-time initializations
 846  *
 847  * Note: On x86_64, fixmaps are ready for use even before this is called.
 848  */
 849
 850 void __init setup_arch(char **cmdline_p)
 851 {
 852         memblock_reserve(__pa_symbol(_text),
 853                          (unsigned long)__bss_stop - (unsigned long)_text);
 854
 855         /*
 856          * Make sure page 0 is always reserved because on systems with
 857          * L1TF its contents can be leaked to user processes.
 858          */
 859         memblock_reserve(0, PAGE_SIZE);
 860
 861         early_reserve_initrd();
 862
 863         /*
 864          * At this point everything still needed from the boot loader
 865          * or BIOS or kernel text should be early reserved or marked not
 866          * RAM in e820. All other memory is free game.
 867          */
 868
 869 #ifdef CONFIG_X86_32
 870         memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
 871
 872         /*
 873          * copy kernel address range established so far and switch
 874          * to the proper swapper page table
 875          */
 876         clone_pgd_range(swapper_pg_dir     + KERNEL_PGD_BOUNDARY,
 877                         initial_page_table + KERNEL_PGD_BOUNDARY,
 878                         KERNEL_PGD_PTRS);
 879
 880         load_cr3(swapper_pg_dir);
 881         /*
 882          * Note: Quark X1000 CPUs advertise PGE incorrectly and require
 883          * a cr3 based tlb flush, so the following __flush_tlb_all()
 884          * will not flush anything because the cpu quirk which clears
 885          * X86_FEATURE_PGE has not been invoked yet. Though due to the
 886          * load_cr3() above the TLB has been flushed already. The
 887          * quirk is invoked before subsequent calls to __flush_tlb_all()
 888          * so proper operation is guaranteed.
 889          */
 890         __flush_tlb_all();
 891 #else
 892         printk(KERN_INFO "Command line: %s\n", boot_command_line);
 893 #endif
 894
 895         /*
 896          * If we have OLPC OFW, we might end up relocating the fixmap due to
 897          * reserve_top(), so do this before touching the ioremap area.
 898          */
 899         olpc_ofw_detect();
 900
 901         idt_setup_early_traps();
 902         early_cpu_init();
 903         early_ioremap_init();
 904
 905         setup_olpc_ofw_pgd();
 906
 907         ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
 908         screen_info = boot_params.screen_info;
 909         edid_info = boot_params.edid_info;
 910 #ifdef CONFIG_X86_32
 911         apm_info.bios = boot_params.apm_bios_info;
 912         ist_info = boot_params.ist_info;
 913 #endif
 914         saved_video_mode = boot_params.hdr.vid_mode;
 915         bootloader_type = boot_params.hdr.type_of_loader;
 916         if ((bootloader_type >> 4) == 0xe) {
 917                 bootloader_type &= 0xf;
 918                 bootloader_type |= (boot_params.hdr.ext_loader_type+0x10) << 4;
 919         }
 920         bootloader_version  = bootloader_type & 0xf;
 921         bootloader_version |= boot_params.hdr.ext_loader_ver << 4;
 922
 923 #ifdef CONFIG_BLK_DEV_RAM
 924         rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
 925         rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
 926         rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
 927 #endif
 928 #ifdef CONFIG_EFI
 929         if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
 930                      EFI32_LOADER_SIGNATURE, 4)) {
 931                 set_bit(EFI_BOOT, &efi.flags);
 932         } else if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
 933                      EFI64_LOADER_SIGNATURE, 4)) {
 934                 set_bit(EFI_BOOT, &efi.flags);
 935                 set_bit(EFI_64BIT, &efi.flags);
 936         }
 937 #endif
 938
 939         x86_init.oem.arch_setup();
 940
 941         iomem_resource.end = (1ULL << boot_cpu_data.x86_phys_bits) - 1;
 942         e820__memory_setup();
 943         parse_setup_data();
 944
 945         copy_edd();
 946
 947         if (!boot_params.hdr.root_flags)
 948                 root_mountflags &= ~MS_RDONLY;
 949         init_mm.start_code = (unsigned long) _text;
 950         init_mm.end_code = (unsigned long) _etext;
 951         init_mm.end_data = (unsigned long) _edata;
 952         init_mm.brk = _brk_end;
 953
 954         mpx_mm_init(&init_mm);
 955
 956         code_resource.start = __pa_symbol(_text);
 957         code_resource.end = __pa_symbol(_etext)-1;
 958         data_resource.start = __pa_symbol(_etext);
 959         data_resource.end = __pa_symbol(_edata)-1;
 960         bss_resource.start = __pa_symbol(__bss_start);
 961         bss_resource.end = __pa_symbol(__bss_stop)-1;
 962
 963 #ifdef CONFIG_CMDLINE_BOOL
 964 #ifdef CONFIG_CMDLINE_OVERRIDE
 965         strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 966 #else
 967         if (builtin_cmdline[0]) {
 968                 /* append boot loader cmdline to builtin */
 969                 strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE);
 970                 strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE);
 971                 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 972         }
 973 #endif
 974 #endif
 975
 976         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 977         *cmdline_p = command_line;
 978
 979         /*
 980          * x86_configure_nx() is called before parse_early_param() to detect
 981          * whether hardware doesn't support NX (so that the early EHCI debug
 982          * console setup can safely call set_fixmap()). It may then be called
 983          * again from within noexec_setup() during parsing early parameters
 984          * to honor the respective command line option.
 985          */
 986         x86_configure_nx();
 987
 988         parse_early_param();
 989
 990         if (efi_enabled(EFI_BOOT))
 991                 efi_memblock_x86_reserve_range();
 992 #ifdef CONFIG_MEMORY_HOTPLUG
 993         /*
 994          * Memory used by the kernel cannot be hot-removed because Linux
 995          * cannot migrate the kernel pages. When memory hotplug is
 996          * enabled, we should prevent memblock from allocating memory
 997          * for the kernel.
 998          *
 999          * ACPI SRAT records all hotpluggable memory ranges. But before
1000          * SRAT is parsed, we don't know about it.
1001          *
1002          * The kernel image is loaded into memory at very early time. We
1003          * cannot prevent this anyway. So on NUMA system, we set any
1004          * node the kernel resides in as un-hotpluggable.
1005          *
1006          * Since on modern servers, one node could have double-digit
1007          * gigabytes memory, we can assume the memory around the kernel
1008          * image is also un-hotpluggable. So before SRAT is parsed, just
1009          * allocate memory near the kernel image to try the best to keep
1010          * the kernel away from hotpluggable memory.
1011          */
1012         if (movable_node_is_enabled())
1013                 memblock_set_bottom_up(true);
1014 #endif
1015
1016         x86_report_nx();
1017
1018         /* after early param, so could get panic from serial */
1019         memblock_x86_reserve_range_setup_data();
1020
1021         if (acpi_mps_check()) {
1022 #ifdef CONFIG_X86_LOCAL_APIC
1023                 disable_apic = 1;
1024 #endif
1025                 setup_clear_cpu_cap(X86_FEATURE_APIC);
1026         }
1027
1028 #ifdef CONFIG_PCI
1029         if (pci_early_dump_regs)
1030                 early_dump_pci_devices();
1031 #endif
1032
1033         e820__reserve_setup_data();
1034         e820__finish_early_params();
1035
1036         if (efi_enabled(EFI_BOOT))
1037                 efi_init();
1038
1039         dmi_scan_machine();
1040         dmi_memdev_walk();
1041         dmi_set_dump_stack_arch_desc();
1042
1043         /*
1044          * VMware detection requires dmi to be available, so this
1045          * needs to be done after dmi_scan_machine, for the BP.
1046          */
1047         init_hypervisor_platform();
1048
1049         simple_udelay_calibration();
1050
1051         x86_init.resources.probe_roms();
1052
1053         /* after parse_early_param, so could debug it */
1054         insert_resource(&iomem_resource, &code_resource);
1055         insert_resource(&iomem_resource, &data_resource);
1056         insert_resource(&iomem_resource, &bss_resource);
1057
1058         e820_add_kernel_range();
1059         trim_bios_range();
1060 #ifdef CONFIG_X86_32
1061         if (ppro_with_ram_bug()) {
1062                 e820__range_update(0x70000000ULL, 0x40000ULL, E820_TYPE_RAM,
1063                                   E820_TYPE_RESERVED);
1064                 e820__update_table(e820_table);
1065                 printk(KERN_INFO "fixed physical RAM map:\n");
1066                 e820__print_table("bad_ppro");
1067         }
1068 #else
1069         early_gart_iommu_check();
1070 #endif
1071
1072         /*
1073          * partially used pages are not usable - thus
1074          * we are rounding upwards:
1075          */
1076         max_pfn = e820__end_of_ram_pfn();
1077
1078         /* update e820 for memory not covered by WB MTRRs */
1079         mtrr_bp_init();
1080         if (mtrr_trim_uncached_memory(max_pfn))
1081                 max_pfn = e820__end_of_ram_pfn();
1082
1083         max_possible_pfn = max_pfn;
1084
1085         /*
1086          * This call is required when the CPU does not support PAT. If
1087          * mtrr_bp_init() invoked it already via pat_init() the call has no
1088          * effect.
1089          */
1090         init_cache_modes();
1091
1092         /*
1093          * Define random base addresses for memory sections after max_pfn is
1094          * defined and before each memory section base is used.
1095          */
1096         kernel_randomize_memory();
1097
1098 #ifdef CONFIG_X86_32
1099         /* max_low_pfn get updated here */
1100         find_low_pfn_range();
1101 #else
1102         check_x2apic();
1103
1104         /* How many end-of-memory variables you have, grandma! */
1105         /* need this before calling reserve_initrd */
1106         if (max_pfn > (1UL<<(32 - PAGE_SHIFT)))
1107                 max_low_pfn = e820__end_of_low_ram_pfn();
1108         else
1109                 max_low_pfn = max_pfn;
1110
1111         high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
1112 #endif
1113
1114         /*
1115          * Find and reserve possible boot-time SMP configuration:
1116          */
1117         find_smp_config();
1118
1119         reserve_ibft_region();
1120
1121         early_alloc_pgt_buf();
1122
1123         /*
1124          * Need to conclude brk, before e820__memblock_setup()
1125          *  it could use memblock_find_in_range, could overlap with
1126          *  brk area.
1127          */
1128         reserve_brk();
1129
1130         cleanup_highmap();
1131
1132         memblock_set_current_limit(ISA_END_ADDRESS);
1133         e820__memblock_setup();
1134
1135         if (!early_xdbc_setup_hardware())
1136                 early_xdbc_register_console();
1137
1138         reserve_bios_regions();
1139
1140         if (efi_enabled(EFI_MEMMAP)) {
1141                 efi_fake_memmap();
1142                 efi_find_mirror();
1143                 efi_esrt_init();
1144
1145                 /*
1146                  * The EFI specification says that boot service code won't be
1147                  * called after ExitBootServices(). This is, in fact, a lie.
1148                  */
1149                 efi_reserve_boot_services();
1150         }
1151
1152         /* preallocate 4k for mptable mpc */
1153         e820__memblock_alloc_reserved_mpc_new();
1154
1155 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
1156         setup_bios_corruption_check();
1157 #endif
1158
1159 #ifdef CONFIG_X86_32
1160         printk(KERN_DEBUG "initial memory mapped: [mem 0x00000000-%#010lx]\n",
1161                         (max_pfn_mapped<<PAGE_SHIFT) - 1);
1162 #endif
1163
1164         reserve_real_mode();
1165
1166         trim_platform_memory_ranges();
1167         trim_low_memory_range();
1168
1169         init_mem_mapping();
1170
1171         idt_setup_early_pf();
1172
1173         /*
1174          * Update mmu_cr4_features (and, indirectly, trampoline_cr4_features)
1175          * with the current CR4 value.  This may not be necessary, but
1176          * auditing all the early-boot CR4 manipulation would be needed to
1177          * rule it out.
1178          *
1179          * Mask off features that don't work outside long mode (just
1180          * PCIDE for now).
1181          */
1182         mmu_cr4_features = __read_cr4() & ~X86_CR4_PCIDE;
1183
1184         memblock_set_current_limit(get_max_mapped());
1185
1186         /*
1187          * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
1188          */
1189
1190 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
1191         if (init_ohci1394_dma_early)
1192                 init_ohci1394_dma_on_all_controllers();
1193 #endif
1194         /* Allocate bigger log buffer */
1195         setup_log_buf(1);
1196
1197         if (efi_enabled(EFI_BOOT)) {
1198                 switch (boot_params.secure_boot) {
1199                 case efi_secureboot_mode_disabled:
1200                         pr_info("Secure boot disabled\n");
1201                         break;
1202                 case efi_secureboot_mode_enabled:
1203                         pr_info("Secure boot enabled\n");
1204                         break;
1205                 default:
1206                         pr_info("Secure boot could not be determined\n");
1207                         break;
1208                 }
1209         }
1210
1211         reserve_initrd();
1212
1213         acpi_table_upgrade();
1214
1215         vsmp_init();
1216
1217         io_delay_init();
1218
1219         early_platform_quirks();
1220
1221         /*
1222          * Parse the ACPI tables for possible boot-time SMP configuration.
1223          */
1224         acpi_boot_table_init();
1225
1226         early_acpi_boot_init();
1227
1228         initmem_init();
1229         dma_contiguous_reserve(max_pfn_mapped << PAGE_SHIFT);
1230
1231         /*
1232          * Reserve memory for crash kernel after SRAT is parsed so that it
1233          * won't consume hotpluggable memory.
1234          */
1235         reserve_crashkernel();
1236
1237         memblock_find_dma_reserve();
1238
1239 #ifdef CONFIG_KVM_GUEST
1240         kvmclock_init();
1241 #endif
1242
1243         x86_init.paging.pagetable_init();
1244
1245         kasan_init();
1246
1247         /*
1248          * Sync back kernel address range.
1249          *
1250          * FIXME: Can the later sync in setup_cpu_entry_areas() replace
1251          * this call?
1252          */
1253         sync_initial_page_table();
1254
1255         tboot_probe();
1256
1257         map_vsyscall();
1258
1259         generic_apic_probe();
1260
1261         early_quirks();
1262
1263         /*
1264          * Read APIC and some other early information from ACPI tables.
1265          */
1266         acpi_boot_init();
1267         sfi_init();
1268         x86_dtb_init();
1269
1270         /*
1271          * get boot-time SMP configuration:
1272          */
1273         get_smp_config();
1274
1275         /*
1276          * Systems w/o ACPI and mptables might not have it mapped the local
1277          * APIC yet, but prefill_possible_map() might need to access it.
1278          */
1279         init_apic_mappings();
1280
1281         prefill_possible_map();
1282
1283         init_cpu_to_node();
1284
1285         io_apic_init_mappings();
1286
1287         kvm_guest_init();
1288
1289         e820__reserve_resources();
1290         e820__register_nosave_regions(max_pfn);
1291
1292         x86_init.resources.reserve_resources();
1293
1294         e820__setup_pci_gap();
1295
1296 #ifdef CONFIG_VT
1297 #if defined(CONFIG_VGA_CONSOLE)
1298         if (!efi_enabled(EFI_BOOT) || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
1299                 conswitchp = &vga_con;
1300 #elif defined(CONFIG_DUMMY_CONSOLE)
1301         conswitchp = &dummy_con;
1302 #endif
1303 #endif
1304         x86_init.oem.banner();
1305
1306         x86_init.timers.wallclock_init();
1307
1308         mcheck_init();
1309
1310         arch_init_ideal_nops();
1311
1312         register_refined_jiffies(CLOCK_TICK_RATE);
1313
1314 #ifdef CONFIG_EFI
1315         if (efi_enabled(EFI_BOOT))
1316                 efi_apply_memmap_quirks();
1317 #endif
1318
1319         unwind_init();
1320 }
1321
1322 #ifdef CONFIG_X86_32
1323
1324 static struct resource video_ram_resource = {
1325         .name   = "Video RAM area",
1326         .start  = 0xa0000,
1327         .end    = 0xbffff,
1328         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
1329 };
1330
1331 void __init i386_reserve_resources(void)
1332 {
1333         request_resource(&iomem_resource, &video_ram_resource);
1334         reserve_standard_io_resources();
1335 }
1336
1337 #endif /* CONFIG_X86_32 */
1338
1339 static struct notifier_block kernel_offset_notifier = {
1340         .notifier_call = dump_kernel_offset
1341 };
1342
1343 static int __init register_kernel_offset_dumper(void)
1344 {
1345         atomic_notifier_chain_register(&panic_notifier_list,
1346                                         &kernel_offset_notifier);
1347         return 0;
1348 }
1349 __initcall(register_kernel_offset_dumper);
1350
1351 void arch_show_smap(struct seq_file *m, struct vm_area_struct *vma)
1352 {
1353         if (!boot_cpu_has(X86_FEATURE_OSPKE))
1354                 return;
1355
1356         seq_printf(m, "ProtectionKey:  %8u\n", vma_pkey(vma));
1357 }