arch/x86/platform/efi/efi.c

   1 /*
   2  * Common EFI (Extensible Firmware Interface) support functions
   3  * Based on Extensible Firmware Interface Specification version 1.0
   4  *
   5  * Copyright (C) 1999 VA Linux Systems
   6  * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
   7  * Copyright (C) 1999-2002 Hewlett-Packard Co.
   8  *      David Mosberger-Tang <davidm@hpl.hp.com>
   9  *      Stephane Eranian <eranian@hpl.hp.com>
  10  * Copyright (C) 2005-2008 Intel Co.
  11  *      Fenghua Yu <fenghua.yu@intel.com>
  12  *      Bibo Mao <bibo.mao@intel.com>
  13  *      Chandramouli Narayanan <mouli@linux.intel.com>
  14  *      Huang Ying <ying.huang@intel.com>
  15  * Copyright (C) 2013 SuSE Labs
  16  *      Borislav Petkov <bp@suse.de> - runtime services VA mapping
  17  *
  18  * Copied from efi_32.c to eliminate the duplicated code between EFI
  19  * 32/64 support code. --ying 2007-10-26
  20  *
  21  * All EFI Runtime Services are not implemented yet as EFI only
  22  * supports physical mode addressing on SoftSDV. This is to be fixed
  23  * in a future version.  --drummond 1999-07-20
  24  *
  25  * Implemented EFI runtime services and virtual mode calls.  --davidm
  26  *
  27  * Goutham Rao: <goutham.rao@intel.com>
  28  *      Skip non-WB memory and ignore empty memory ranges.
  29  */
  30
  31 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  32
  33 #include <linux/kernel.h>
  34 #include <linux/init.h>
  35 #include <linux/efi.h>
  36 #include <linux/efi-bgrt.h>
  37 #include <linux/export.h>
  38 #include <linux/bootmem.h>
  39 #include <linux/slab.h>
  40 #include <linux/memblock.h>
  41 #include <linux/spinlock.h>
  42 #include <linux/uaccess.h>
  43 #include <linux/time.h>
  44 #include <linux/io.h>
  45 #include <linux/reboot.h>
  46 #include <linux/bcd.h>
  47
  48 #include <asm/setup.h>
  49 #include <asm/efi.h>
  50 #include <asm/time.h>
  51 #include <asm/cacheflush.h>
  52 #include <asm/tlbflush.h>
  53 #include <asm/x86_init.h>
  54 #include <asm/rtc.h>
  55 #include <asm/uv/uv.h>
  56
  57 #define EFI_DEBUG
  58
  59 #define EFI_MIN_RESERVE 5120
  60
  61 #define EFI_DUMMY_GUID \
  62         EFI_GUID(0x4424ac57, 0xbe4b, 0x47dd, 0x9e, 0x97, 0xed, 0x50, 0xf0, 0x9f, 0x92, 0xa9)
  63
  64 static efi_char16_t efi_dummy_name[6] = { 'D', 'U', 'M', 'M', 'Y', 0 };
  65
  66 struct efi_memory_map memmap;
  67
  68 static struct efi efi_phys __initdata;
  69 static efi_system_table_t efi_systab __initdata;
  70
  71 static efi_config_table_type_t arch_tables[] __initdata = {
  72 #ifdef CONFIG_X86_UV
  73         {UV_SYSTEM_TABLE_GUID, "UVsystab", &efi.uv_systab},
  74 #endif
  75         {NULL_GUID, NULL, NULL},
  76 };
  77
  78 u64 efi_setup;          /* efi setup_data physical address */
  79
  80 static bool disable_runtime __initdata = false;
  81 static int __init setup_noefi(char *arg)
  82 {
  83         disable_runtime = true;
  84         return 0;
  85 }
  86 early_param("noefi", setup_noefi);
  87
  88 int add_efi_memmap;
  89 EXPORT_SYMBOL(add_efi_memmap);
  90
  91 static int __init setup_add_efi_memmap(char *arg)
  92 {
  93         add_efi_memmap = 1;
  94         return 0;
  95 }
  96 early_param("add_efi_memmap", setup_add_efi_memmap);
  97
  98 static bool efi_no_storage_paranoia;
  99
 100 static int __init setup_storage_paranoia(char *arg)
 101 {
 102         efi_no_storage_paranoia = true;
 103         return 0;
 104 }
 105 early_param("efi_no_storage_paranoia", setup_storage_paranoia);
 106
 107 static efi_status_t virt_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
 108 {
 109         unsigned long flags;
 110         efi_status_t status;
 111
 112         spin_lock_irqsave(&rtc_lock, flags);
 113         status = efi_call_virt(get_time, tm, tc);
 114         spin_unlock_irqrestore(&rtc_lock, flags);
 115         return status;
 116 }
 117
 118 static efi_status_t virt_efi_set_time(efi_time_t *tm)
 119 {
 120         unsigned long flags;
 121         efi_status_t status;
 122
 123         spin_lock_irqsave(&rtc_lock, flags);
 124         status = efi_call_virt(set_time, tm);
 125         spin_unlock_irqrestore(&rtc_lock, flags);
 126         return status;
 127 }
 128
 129 static efi_status_t virt_efi_get_wakeup_time(efi_bool_t *enabled,
 130                                              efi_bool_t *pending,
 131                                              efi_time_t *tm)
 132 {
 133         unsigned long flags;
 134         efi_status_t status;
 135
 136         spin_lock_irqsave(&rtc_lock, flags);
 137         status = efi_call_virt(get_wakeup_time, enabled, pending, tm);
 138         spin_unlock_irqrestore(&rtc_lock, flags);
 139         return status;
 140 }
 141
 142 static efi_status_t virt_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
 143 {
 144         unsigned long flags;
 145         efi_status_t status;
 146
 147         spin_lock_irqsave(&rtc_lock, flags);
 148         status = efi_call_virt(set_wakeup_time, enabled, tm);
 149         spin_unlock_irqrestore(&rtc_lock, flags);
 150         return status;
 151 }
 152
 153 static efi_status_t virt_efi_get_variable(efi_char16_t *name,
 154                                           efi_guid_t *vendor,
 155                                           u32 *attr,
 156                                           unsigned long *data_size,
 157                                           void *data)
 158 {
 159         return efi_call_virt(get_variable,
 160                              name, vendor, attr,
 161                              data_size, data);
 162 }
 163
 164 static efi_status_t virt_efi_get_next_variable(unsigned long *name_size,
 165                                                efi_char16_t *name,
 166                                                efi_guid_t *vendor)
 167 {
 168         return efi_call_virt(get_next_variable,
 169                              name_size, name, vendor);
 170 }
 171
 172 static efi_status_t virt_efi_set_variable(efi_char16_t *name,
 173                                           efi_guid_t *vendor,
 174                                           u32 attr,
 175                                           unsigned long data_size,
 176                                           void *data)
 177 {
 178         return efi_call_virt(set_variable,
 179                              name, vendor, attr,
 180                              data_size, data);
 181 }
 182
 183 static efi_status_t virt_efi_query_variable_info(u32 attr,
 184                                                  u64 *storage_space,
 185                                                  u64 *remaining_space,
 186                                                  u64 *max_variable_size)
 187 {
 188         if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
 189                 return EFI_UNSUPPORTED;
 190
 191         return efi_call_virt(query_variable_info, attr, storage_space,
 192                              remaining_space, max_variable_size);
 193 }
 194
 195 static efi_status_t virt_efi_get_next_high_mono_count(u32 *count)
 196 {
 197         return efi_call_virt(get_next_high_mono_count, count);
 198 }
 199
 200 static void virt_efi_reset_system(int reset_type,
 201                                   efi_status_t status,
 202                                   unsigned long data_size,
 203                                   efi_char16_t *data)
 204 {
 205         efi_call_virt(reset_system, reset_type, status,
 206                       data_size, data);
 207 }
 208
 209 static efi_status_t virt_efi_update_capsule(efi_capsule_header_t **capsules,
 210                                             unsigned long count,
 211                                             unsigned long sg_list)
 212 {
 213         if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
 214                 return EFI_UNSUPPORTED;
 215
 216         return efi_call_virt(update_capsule, capsules, count, sg_list);
 217 }
 218
 219 static efi_status_t virt_efi_query_capsule_caps(efi_capsule_header_t **capsules,
 220                                                 unsigned long count,
 221                                                 u64 *max_size,
 222                                                 int *reset_type)
 223 {
 224         if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
 225                 return EFI_UNSUPPORTED;
 226
 227         return efi_call_virt(query_capsule_caps, capsules, count, max_size,
 228                              reset_type);
 229 }
 230
 231 static efi_status_t __init phys_efi_set_virtual_address_map(
 232         unsigned long memory_map_size,
 233         unsigned long descriptor_size,
 234         u32 descriptor_version,
 235         efi_memory_desc_t *virtual_map)
 236 {
 237         efi_status_t status;
 238
 239         efi_call_phys_prelog();
 240         status = efi_call_phys(efi_phys.set_virtual_address_map,
 241                                memory_map_size, descriptor_size,
 242                                descriptor_version, virtual_map);
 243         efi_call_phys_epilog();
 244         return status;
 245 }
 246
 247 int efi_set_rtc_mmss(const struct timespec *now)
 248 {
 249         unsigned long nowtime = now->tv_sec;
 250         efi_status_t    status;
 251         efi_time_t      eft;
 252         efi_time_cap_t  cap;
 253         struct rtc_time tm;
 254
 255         status = efi.get_time(&eft, &cap);
 256         if (status != EFI_SUCCESS) {
 257                 pr_err("Oops: efitime: can't read time!\n");
 258                 return -1;
 259         }
 260
 261         rtc_time_to_tm(nowtime, &tm);
 262         if (!rtc_valid_tm(&tm)) {
 263                 eft.year = tm.tm_year + 1900;
 264                 eft.month = tm.tm_mon + 1;
 265                 eft.day = tm.tm_mday;
 266                 eft.minute = tm.tm_min;
 267                 eft.second = tm.tm_sec;
 268                 eft.nanosecond = 0;
 269         } else {
 270                 pr_err("%s: Invalid EFI RTC value: write of %lx to EFI RTC failed\n",
 271                        __func__, nowtime);
 272                 return -1;
 273         }
 274
 275         status = efi.set_time(&eft);
 276         if (status != EFI_SUCCESS) {
 277                 pr_err("Oops: efitime: can't write time!\n");
 278                 return -1;
 279         }
 280         return 0;
 281 }
 282
 283 void efi_get_time(struct timespec *now)
 284 {
 285         efi_status_t status;
 286         efi_time_t eft;
 287         efi_time_cap_t cap;
 288
 289         status = efi.get_time(&eft, &cap);
 290         if (status != EFI_SUCCESS)
 291                 pr_err("Oops: efitime: can't read time!\n");
 292
 293         now->tv_sec = mktime(eft.year, eft.month, eft.day, eft.hour,
 294                              eft.minute, eft.second);
 295         now->tv_nsec = 0;
 296 }
 297
 298 /*
 299  * Tell the kernel about the EFI memory map.  This might include
 300  * more than the max 128 entries that can fit in the e820 legacy
 301  * (zeropage) memory map.
 302  */
 303
 304 static void __init do_add_efi_memmap(void)
 305 {
 306         void *p;
 307
 308         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 309                 efi_memory_desc_t *md = p;
 310                 unsigned long long start = md->phys_addr;
 311                 unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
 312                 int e820_type;
 313
 314                 switch (md->type) {
 315                 case EFI_LOADER_CODE:
 316                 case EFI_LOADER_DATA:
 317                 case EFI_BOOT_SERVICES_CODE:
 318                 case EFI_BOOT_SERVICES_DATA:
 319                 case EFI_CONVENTIONAL_MEMORY:
 320                         if (md->attribute & EFI_MEMORY_WB)
 321                                 e820_type = E820_RAM;
 322                         else
 323                                 e820_type = E820_RESERVED;
 324                         break;
 325                 case EFI_ACPI_RECLAIM_MEMORY:
 326                         e820_type = E820_ACPI;
 327                         break;
 328                 case EFI_ACPI_MEMORY_NVS:
 329                         e820_type = E820_NVS;
 330                         break;
 331                 case EFI_UNUSABLE_MEMORY:
 332                         e820_type = E820_UNUSABLE;
 333                         break;
 334                 default:
 335                         /*
 336                          * EFI_RESERVED_TYPE EFI_RUNTIME_SERVICES_CODE
 337                          * EFI_RUNTIME_SERVICES_DATA EFI_MEMORY_MAPPED_IO
 338                          * EFI_MEMORY_MAPPED_IO_PORT_SPACE EFI_PAL_CODE
 339                          */
 340                         e820_type = E820_RESERVED;
 341                         break;
 342                 }
 343                 e820_add_region(start, size, e820_type);
 344         }
 345         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 346 }
 347
 348 int __init efi_memblock_x86_reserve_range(void)
 349 {
 350         struct efi_info *e = &boot_params.efi_info;
 351         unsigned long pmap;
 352
 353 #ifdef CONFIG_X86_32
 354         /* Can't handle data above 4GB at this time */
 355         if (e->efi_memmap_hi) {
 356                 pr_err("Memory map is above 4GB, disabling EFI.\n");
 357                 return -EINVAL;
 358         }
 359         pmap =  e->efi_memmap;
 360 #else
 361         pmap = (e->efi_memmap | ((__u64)e->efi_memmap_hi << 32));
 362 #endif
 363         memmap.phys_map         = (void *)pmap;
 364         memmap.nr_map           = e->efi_memmap_size /
 365                                   e->efi_memdesc_size;
 366         memmap.desc_size        = e->efi_memdesc_size;
 367         memmap.desc_version     = e->efi_memdesc_version;
 368
 369         memblock_reserve(pmap, memmap.nr_map * memmap.desc_size);
 370
 371         efi.memmap = &memmap;
 372
 373         return 0;
 374 }
 375
 376 static void __init print_efi_memmap(void)
 377 {
 378 #ifdef EFI_DEBUG
 379         efi_memory_desc_t *md;
 380         void *p;
 381         int i;
 382
 383         for (p = memmap.map, i = 0;
 384              p < memmap.map_end;
 385              p += memmap.desc_size, i++) {
 386                 md = p;
 387                 pr_info("mem%02u: type=%u, attr=0x%llx, range=[0x%016llx-0x%016llx) (%lluMB)\n",
 388                         i, md->type, md->attribute, md->phys_addr,
 389                         md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
 390                         (md->num_pages >> (20 - EFI_PAGE_SHIFT)));
 391         }
 392 #endif  /*  EFI_DEBUG  */
 393 }
 394
 395 void __init efi_reserve_boot_services(void)
 396 {
 397         void *p;
 398
 399         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 400                 efi_memory_desc_t *md = p;
 401                 u64 start = md->phys_addr;
 402                 u64 size = md->num_pages << EFI_PAGE_SHIFT;
 403
 404                 if (md->type != EFI_BOOT_SERVICES_CODE &&
 405                     md->type != EFI_BOOT_SERVICES_DATA)
 406                         continue;
 407                 /* Only reserve where possible:
 408                  * - Not within any already allocated areas
 409                  * - Not over any memory area (really needed, if above?)
 410                  * - Not within any part of the kernel
 411                  * - Not the bios reserved area
 412                 */
 413                 if ((start + size > __pa_symbol(_text)
 414                                 && start <= __pa_symbol(_end)) ||
 415                         !e820_all_mapped(start, start+size, E820_RAM) ||
 416                         memblock_is_region_reserved(start, size)) {
 417                         /* Could not reserve, skip it */
 418                         md->num_pages = 0;
 419                         memblock_dbg("Could not reserve boot range [0x%010llx-0x%010llx]\n",
 420                                      start, start+size-1);
 421                 } else
 422                         memblock_reserve(start, size);
 423         }
 424 }
 425
 426 void __init efi_unmap_memmap(void)
 427 {
 428         clear_bit(EFI_MEMMAP, &efi.flags);
 429         if (memmap.map) {
 430                 early_iounmap(memmap.map, memmap.nr_map * memmap.desc_size);
 431                 memmap.map = NULL;
 432         }
 433 }
 434
 435 void __init efi_free_boot_services(void)
 436 {
 437         void *p;
 438
 439         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 440                 efi_memory_desc_t *md = p;
 441                 unsigned long long start = md->phys_addr;
 442                 unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
 443
 444                 if (md->type != EFI_BOOT_SERVICES_CODE &&
 445                     md->type != EFI_BOOT_SERVICES_DATA)
 446                         continue;
 447
 448                 /* Could not reserve boot area */
 449                 if (!size)
 450                         continue;
 451
 452                 free_bootmem_late(start, size);
 453         }
 454
 455         efi_unmap_memmap();
 456 }
 457
 458 static int __init efi_systab_init(void *phys)
 459 {
 460         if (efi_enabled(EFI_64BIT)) {
 461                 efi_system_table_64_t *systab64;
 462                 struct efi_setup_data *data = NULL;
 463                 u64 tmp = 0;
 464
 465                 if (efi_setup) {
 466                         data = early_memremap(efi_setup, sizeof(*data));
 467                         if (!data)
 468                                 return -ENOMEM;
 469                 }
 470                 systab64 = early_ioremap((unsigned long)phys,
 471                                          sizeof(*systab64));
 472                 if (systab64 == NULL) {
 473                         pr_err("Couldn't map the system table!\n");
 474                         if (data)
 475                                 early_iounmap(data, sizeof(*data));
 476                         return -ENOMEM;
 477                 }
 478
 479                 efi_systab.hdr = systab64->hdr;
 480                 efi_systab.fw_vendor = data ? (unsigned long)data->fw_vendor :
 481                                               systab64->fw_vendor;
 482                 tmp |= data ? data->fw_vendor : systab64->fw_vendor;
 483                 efi_systab.fw_revision = systab64->fw_revision;
 484                 efi_systab.con_in_handle = systab64->con_in_handle;
 485                 tmp |= systab64->con_in_handle;
 486                 efi_systab.con_in = systab64->con_in;
 487                 tmp |= systab64->con_in;
 488                 efi_systab.con_out_handle = systab64->con_out_handle;
 489                 tmp |= systab64->con_out_handle;
 490                 efi_systab.con_out = systab64->con_out;
 491                 tmp |= systab64->con_out;
 492                 efi_systab.stderr_handle = systab64->stderr_handle;
 493                 tmp |= systab64->stderr_handle;
 494                 efi_systab.stderr = systab64->stderr;
 495                 tmp |= systab64->stderr;
 496                 efi_systab.runtime = data ?
 497                                      (void *)(unsigned long)data->runtime :
 498                                      (void *)(unsigned long)systab64->runtime;
 499                 tmp |= data ? data->runtime : systab64->runtime;
 500                 efi_systab.boottime = (void *)(unsigned long)systab64->boottime;
 501                 tmp |= systab64->boottime;
 502                 efi_systab.nr_tables = systab64->nr_tables;
 503                 efi_systab.tables = data ? (unsigned long)data->tables :
 504                                            systab64->tables;
 505                 tmp |= data ? data->tables : systab64->tables;
 506
 507                 early_iounmap(systab64, sizeof(*systab64));
 508                 if (data)
 509                         early_iounmap(data, sizeof(*data));
 510 #ifdef CONFIG_X86_32
 511                 if (tmp >> 32) {
 512                         pr_err("EFI data located above 4GB, disabling EFI.\n");
 513                         return -EINVAL;
 514                 }
 515 #endif
 516         } else {
 517                 efi_system_table_32_t *systab32;
 518
 519                 systab32 = early_ioremap((unsigned long)phys,
 520                                          sizeof(*systab32));
 521                 if (systab32 == NULL) {
 522                         pr_err("Couldn't map the system table!\n");
 523                         return -ENOMEM;
 524                 }
 525
 526                 efi_systab.hdr = systab32->hdr;
 527                 efi_systab.fw_vendor = systab32->fw_vendor;
 528                 efi_systab.fw_revision = systab32->fw_revision;
 529                 efi_systab.con_in_handle = systab32->con_in_handle;
 530                 efi_systab.con_in = systab32->con_in;
 531                 efi_systab.con_out_handle = systab32->con_out_handle;
 532                 efi_systab.con_out = systab32->con_out;
 533                 efi_systab.stderr_handle = systab32->stderr_handle;
 534                 efi_systab.stderr = systab32->stderr;
 535                 efi_systab.runtime = (void *)(unsigned long)systab32->runtime;
 536                 efi_systab.boottime = (void *)(unsigned long)systab32->boottime;
 537                 efi_systab.nr_tables = systab32->nr_tables;
 538                 efi_systab.tables = systab32->tables;
 539
 540                 early_iounmap(systab32, sizeof(*systab32));
 541         }
 542
 543         efi.systab = &efi_systab;
 544
 545         /*
 546          * Verify the EFI Table
 547          */
 548         if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) {
 549                 pr_err("System table signature incorrect!\n");
 550                 return -EINVAL;
 551         }
 552         if ((efi.systab->hdr.revision >> 16) == 0)
 553                 pr_err("Warning: System table version %d.%02d, expected 1.00 or greater!\n",
 554                        efi.systab->hdr.revision >> 16,
 555                        efi.systab->hdr.revision & 0xffff);
 556
 557         set_bit(EFI_SYSTEM_TABLES, &efi.flags);
 558
 559         return 0;
 560 }
 561
 562 static int __init efi_runtime_init32(void)
 563 {
 564         efi_runtime_services_32_t *runtime;
 565
 566         runtime = early_ioremap((unsigned long)efi.systab->runtime,
 567                         sizeof(efi_runtime_services_32_t));
 568         if (!runtime) {
 569                 pr_err("Could not map the runtime service table!\n");
 570                 return -ENOMEM;
 571         }
 572
 573         /*
 574          * We will only need *early* access to the following two
 575          * EFI runtime services before set_virtual_address_map
 576          * is invoked.
 577          */
 578         efi_phys.set_virtual_address_map =
 579                         (efi_set_virtual_address_map_t *)
 580                         (unsigned long)runtime->set_virtual_address_map;
 581         early_iounmap(runtime, sizeof(efi_runtime_services_32_t));
 582
 583         return 0;
 584 }
 585
 586 static int __init efi_runtime_init64(void)
 587 {
 588         efi_runtime_services_64_t *runtime;
 589
 590         runtime = early_ioremap((unsigned long)efi.systab->runtime,
 591                         sizeof(efi_runtime_services_64_t));
 592         if (!runtime) {
 593                 pr_err("Could not map the runtime service table!\n");
 594                 return -ENOMEM;
 595         }
 596
 597         /*
 598          * We will only need *early* access to the following two
 599          * EFI runtime services before set_virtual_address_map
 600          * is invoked.
 601          */
 602         efi_phys.set_virtual_address_map =
 603                         (efi_set_virtual_address_map_t *)
 604                         (unsigned long)runtime->set_virtual_address_map;
 605         early_iounmap(runtime, sizeof(efi_runtime_services_64_t));
 606
 607         return 0;
 608 }
 609
 610 static int __init efi_runtime_init(void)
 611 {
 612         int rv;
 613
 614         /*
 615          * Check out the runtime services table. We need to map
 616          * the runtime services table so that we can grab the physical
 617          * address of several of the EFI runtime functions, needed to
 618          * set the firmware into virtual mode.
 619          */
 620         if (efi_enabled(EFI_64BIT))
 621                 rv = efi_runtime_init64();
 622         else
 623                 rv = efi_runtime_init32();
 624
 625         if (rv)
 626                 return rv;
 627
 628         set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
 629
 630         return 0;
 631 }
 632
 633 static int __init efi_memmap_init(void)
 634 {
 635         /* Map the EFI memory map */
 636         memmap.map = early_ioremap((unsigned long)memmap.phys_map,
 637                                    memmap.nr_map * memmap.desc_size);
 638         if (memmap.map == NULL) {
 639                 pr_err("Could not map the memory map!\n");
 640                 return -ENOMEM;
 641         }
 642         memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
 643
 644         if (add_efi_memmap)
 645                 do_add_efi_memmap();
 646
 647         set_bit(EFI_MEMMAP, &efi.flags);
 648
 649         return 0;
 650 }
 651
 652 /*
 653  * A number of config table entries get remapped to virtual addresses
 654  * after entering EFI virtual mode. However, the kexec kernel requires
 655  * their physical addresses therefore we pass them via setup_data and
 656  * correct those entries to their respective physical addresses here.
 657  *
 658  * Currently only handles smbios which is necessary for some firmware
 659  * implementation.
 660  */
 661 static int __init efi_reuse_config(u64 tables, int nr_tables)
 662 {
 663         int i, sz, ret = 0;
 664         void *p, *tablep;
 665         struct efi_setup_data *data;
 666
 667         if (!efi_setup)
 668                 return 0;
 669
 670         if (!efi_enabled(EFI_64BIT))
 671                 return 0;
 672
 673         data = early_memremap(efi_setup, sizeof(*data));
 674         if (!data) {
 675                 ret = -ENOMEM;
 676                 goto out;
 677         }
 678
 679         if (!data->smbios)
 680                 goto out_memremap;
 681
 682         sz = sizeof(efi_config_table_64_t);
 683
 684         p = tablep = early_memremap(tables, nr_tables * sz);
 685         if (!p) {
 686                 pr_err("Could not map Configuration table!\n");
 687                 ret = -ENOMEM;
 688                 goto out_memremap;
 689         }
 690
 691         for (i = 0; i < efi.systab->nr_tables; i++) {
 692                 efi_guid_t guid;
 693
 694                 guid = ((efi_config_table_64_t *)p)->guid;
 695
 696                 if (!efi_guidcmp(guid, SMBIOS_TABLE_GUID))
 697                         ((efi_config_table_64_t *)p)->table = data->smbios;
 698                 p += sz;
 699         }
 700         early_iounmap(tablep, nr_tables * sz);
 701
 702 out_memremap:
 703         early_iounmap(data, sizeof(*data));
 704 out:
 705         return ret;
 706 }
 707
 708 void __init efi_init(void)
 709 {
 710         efi_char16_t *c16;
 711         char vendor[100] = "unknown";
 712         int i = 0;
 713         void *tmp;
 714
 715 #ifdef CONFIG_X86_32
 716         if (boot_params.efi_info.efi_systab_hi ||
 717             boot_params.efi_info.efi_memmap_hi) {
 718                 pr_info("Table located above 4GB, disabling EFI.\n");
 719                 return;
 720         }
 721         efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab;
 722 #else
 723         efi_phys.systab = (efi_system_table_t *)
 724                           (boot_params.efi_info.efi_systab |
 725                           ((__u64)boot_params.efi_info.efi_systab_hi<<32));
 726 #endif
 727
 728         if (efi_systab_init(efi_phys.systab))
 729                 return;
 730
 731         set_bit(EFI_SYSTEM_TABLES, &efi.flags);
 732
 733         efi.config_table = (unsigned long)efi.systab->tables;
 734         efi.fw_vendor    = (unsigned long)efi.systab->fw_vendor;
 735         efi.runtime      = (unsigned long)efi.systab->runtime;
 736
 737         /*
 738          * Show what we know for posterity
 739          */
 740         c16 = tmp = early_ioremap(efi.systab->fw_vendor, 2);
 741         if (c16) {
 742                 for (i = 0; i < sizeof(vendor) - 1 && *c16; ++i)
 743                         vendor[i] = *c16++;
 744                 vendor[i] = '\0';
 745         } else
 746                 pr_err("Could not map the firmware vendor!\n");
 747         early_iounmap(tmp, 2);
 748
 749         pr_info("EFI v%u.%.02u by %s\n",
 750                 efi.systab->hdr.revision >> 16,
 751                 efi.systab->hdr.revision & 0xffff, vendor);
 752
 753         if (efi_reuse_config(efi.systab->tables, efi.systab->nr_tables))
 754                 return;
 755
 756         if (efi_config_init(arch_tables))
 757                 return;
 758
 759         /*
 760          * Note: We currently don't support runtime services on an EFI
 761          * that doesn't match the kernel 32/64-bit mode.
 762          */
 763
 764         if (!efi_runtime_supported())
 765                 pr_info("No EFI runtime due to 32/64-bit mismatch with kernel\n");
 766         else {
 767                 if (disable_runtime || efi_runtime_init())
 768                         return;
 769         }
 770         if (efi_memmap_init())
 771                 return;
 772
 773         set_bit(EFI_MEMMAP, &efi.flags);
 774
 775         print_efi_memmap();
 776 }
 777
 778 void __init efi_late_init(void)
 779 {
 780         efi_bgrt_init();
 781 }
 782
 783 void __init efi_set_executable(efi_memory_desc_t *md, bool executable)
 784 {
 785         u64 addr, npages;
 786
 787         addr = md->virt_addr;
 788         npages = md->num_pages;
 789
 790         memrange_efi_to_native(&addr, &npages);
 791
 792         if (executable)
 793                 set_memory_x(addr, npages);
 794         else
 795                 set_memory_nx(addr, npages);
 796 }
 797
 798 void __init runtime_code_page_mkexec(void)
 799 {
 800         efi_memory_desc_t *md;
 801         void *p;
 802
 803         /* Make EFI runtime service code area executable */
 804         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 805                 md = p;
 806
 807                 if (md->type != EFI_RUNTIME_SERVICES_CODE)
 808                         continue;
 809
 810                 efi_set_executable(md, true);
 811         }
 812 }
 813
 814 void efi_memory_uc(u64 addr, unsigned long size)
 815 {
 816         unsigned long page_shift = 1UL << EFI_PAGE_SHIFT;
 817         u64 npages;
 818
 819         npages = round_up(size, page_shift) / page_shift;
 820         memrange_efi_to_native(&addr, &npages);
 821         set_memory_uc(addr, npages);
 822 }
 823
 824 void __init old_map_region(efi_memory_desc_t *md)
 825 {
 826         u64 start_pfn, end_pfn, end;
 827         unsigned long size;
 828         void *va;
 829
 830         start_pfn = PFN_DOWN(md->phys_addr);
 831         size      = md->num_pages << PAGE_SHIFT;
 832         end       = md->phys_addr + size;
 833         end_pfn   = PFN_UP(end);
 834
 835         if (pfn_range_is_mapped(start_pfn, end_pfn)) {
 836                 va = __va(md->phys_addr);
 837
 838                 if (!(md->attribute & EFI_MEMORY_WB))
 839                         efi_memory_uc((u64)(unsigned long)va, size);
 840         } else
 841                 va = efi_ioremap(md->phys_addr, size,
 842                                  md->type, md->attribute);
 843
 844         md->virt_addr = (u64) (unsigned long) va;
 845         if (!va)
 846                 pr_err("ioremap of 0x%llX failed!\n",
 847                        (unsigned long long)md->phys_addr);
 848 }
 849
 850 static void native_runtime_setup(void)
 851 {
 852         efi.get_time = virt_efi_get_time;
 853         efi.set_time = virt_efi_set_time;
 854         efi.get_wakeup_time = virt_efi_get_wakeup_time;
 855         efi.set_wakeup_time = virt_efi_set_wakeup_time;
 856         efi.get_variable = virt_efi_get_variable;
 857         efi.get_next_variable = virt_efi_get_next_variable;
 858         efi.set_variable = virt_efi_set_variable;
 859         efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count;
 860         efi.reset_system = virt_efi_reset_system;
 861         efi.query_variable_info = virt_efi_query_variable_info;
 862         efi.update_capsule = virt_efi_update_capsule;
 863         efi.query_capsule_caps = virt_efi_query_capsule_caps;
 864 }
 865
 866 /* Merge contiguous regions of the same type and attribute */
 867 static void __init efi_merge_regions(void)
 868 {
 869         void *p;
 870         efi_memory_desc_t *md, *prev_md = NULL;
 871
 872         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 873                 u64 prev_size;
 874                 md = p;
 875
 876                 if (!prev_md) {
 877                         prev_md = md;
 878                         continue;
 879                 }
 880
 881                 if (prev_md->type != md->type ||
 882                     prev_md->attribute != md->attribute) {
 883                         prev_md = md;
 884                         continue;
 885                 }
 886
 887                 prev_size = prev_md->num_pages << EFI_PAGE_SHIFT;
 888
 889                 if (md->phys_addr == (prev_md->phys_addr + prev_size)) {
 890                         prev_md->num_pages += md->num_pages;
 891                         md->type = EFI_RESERVED_TYPE;
 892                         md->attribute = 0;
 893                         continue;
 894                 }
 895                 prev_md = md;
 896         }
 897 }
 898
 899 static void __init get_systab_virt_addr(efi_memory_desc_t *md)
 900 {
 901         unsigned long size;
 902         u64 end, systab;
 903
 904         size = md->num_pages << EFI_PAGE_SHIFT;
 905         end = md->phys_addr + size;
 906         systab = (u64)(unsigned long)efi_phys.systab;
 907         if (md->phys_addr <= systab && systab < end) {
 908                 systab += md->virt_addr - md->phys_addr;
 909                 efi.systab = (efi_system_table_t *)(unsigned long)systab;
 910         }
 911 }
 912
 913 static void __init save_runtime_map(void)
 914 {
 915 #ifdef CONFIG_KEXEC
 916         efi_memory_desc_t *md;
 917         void *tmp, *p, *q = NULL;
 918         int count = 0;
 919
 920         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 921                 md = p;
 922
 923                 if (!(md->attribute & EFI_MEMORY_RUNTIME) ||
 924                     (md->type == EFI_BOOT_SERVICES_CODE) ||
 925                     (md->type == EFI_BOOT_SERVICES_DATA))
 926                         continue;
 927                 tmp = krealloc(q, (count + 1) * memmap.desc_size, GFP_KERNEL);
 928                 if (!tmp)
 929                         goto out;
 930                 q = tmp;
 931
 932                 memcpy(q + count * memmap.desc_size, md, memmap.desc_size);
 933                 count++;
 934         }
 935
 936         efi_runtime_map_setup(q, count, memmap.desc_size);
 937         return;
 938
 939 out:
 940         kfree(q);
 941         pr_err("Error saving runtime map, efi runtime on kexec non-functional!!\n");
 942 #endif
 943 }
 944
 945 static void *realloc_pages(void *old_memmap, int old_shift)
 946 {
 947         void *ret;
 948
 949         ret = (void *)__get_free_pages(GFP_KERNEL, old_shift + 1);
 950         if (!ret)
 951                 goto out;
 952
 953         /*
 954          * A first-time allocation doesn't have anything to copy.
 955          */
 956         if (!old_memmap)
 957                 return ret;
 958
 959         memcpy(ret, old_memmap, PAGE_SIZE << old_shift);
 960
 961 out:
 962         free_pages((unsigned long)old_memmap, old_shift);
 963         return ret;
 964 }
 965
 966 /*
 967  * Map the efi memory ranges of the runtime services and update new_mmap with
 968  * virtual addresses.
 969  */
 970 static void * __init efi_map_regions(int *count, int *pg_shift)
 971 {
 972         void *p, *new_memmap = NULL;
 973         unsigned long left = 0;
 974         efi_memory_desc_t *md;
 975
 976         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 977                 md = p;
 978                 if (!(md->attribute & EFI_MEMORY_RUNTIME)) {
 979 #ifdef CONFIG_X86_64
 980                         if (md->type != EFI_BOOT_SERVICES_CODE &&
 981                             md->type != EFI_BOOT_SERVICES_DATA)
 982 #endif
 983                                 continue;
 984                 }
 985
 986                 efi_map_region(md);
 987                 get_systab_virt_addr(md);
 988
 989                 if (left < memmap.desc_size) {
 990                         new_memmap = realloc_pages(new_memmap, *pg_shift);
 991                         if (!new_memmap)
 992                                 return NULL;
 993
 994                         left += PAGE_SIZE << *pg_shift;
 995                         (*pg_shift)++;
 996                 }
 997
 998                 memcpy(new_memmap + (*count * memmap.desc_size), md,
 999                        memmap.desc_size);
1000
1001                 left -= memmap.desc_size;
1002                 (*count)++;
1003         }
1004
1005         return new_memmap;
1006 }
1007
1008 static void __init kexec_enter_virtual_mode(void)
1009 {
1010 #ifdef CONFIG_KEXEC
1011         efi_memory_desc_t *md;
1012         void *p;
1013
1014         efi.systab = NULL;
1015
1016         /*
1017          * We don't do virtual mode, since we don't do runtime services, on
1018          * non-native EFI
1019          */
1020         if (!efi_is_native()) {
1021                 efi_unmap_memmap();
1022                 return;
1023         }
1024
1025         /*
1026         * Map efi regions which were passed via setup_data. The virt_addr is a
1027         * fixed addr which was used in first kernel of a kexec boot.
1028         */
1029         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
1030                 md = p;
1031                 efi_map_region_fixed(md); /* FIXME: add error handling */
1032                 get_systab_virt_addr(md);
1033         }
1034
1035         save_runtime_map();
1036
1037         BUG_ON(!efi.systab);
1038
1039         efi_sync_low_kernel_mappings();
1040
1041         /*
1042          * Now that EFI is in virtual mode, update the function
1043          * pointers in the runtime service table to the new virtual addresses.
1044          *
1045          * Call EFI services through wrapper functions.
1046          */
1047         efi.runtime_version = efi_systab.hdr.revision;
1048
1049         native_runtime_setup();
1050
1051         efi.set_virtual_address_map = NULL;
1052
1053         if (efi_enabled(EFI_OLD_MEMMAP) && (__supported_pte_mask & _PAGE_NX))
1054                 runtime_code_page_mkexec();
1055
1056         /* clean DUMMY object */
1057         efi.set_variable(efi_dummy_name, &EFI_DUMMY_GUID,
1058                          EFI_VARIABLE_NON_VOLATILE |
1059                          EFI_VARIABLE_BOOTSERVICE_ACCESS |
1060                          EFI_VARIABLE_RUNTIME_ACCESS,
1061                          0, NULL);
1062 #endif
1063 }
1064
1065 /*
1066  * This function will switch the EFI runtime services to virtual mode.
1067  * Essentially, we look through the EFI memmap and map every region that
1068  * has the runtime attribute bit set in its memory descriptor into the
1069  * ->trampoline_pgd page table using a top-down VA allocation scheme.
1070  *
1071  * The old method which used to update that memory descriptor with the
1072  * virtual address obtained from ioremap() is still supported when the
1073  * kernel is booted with efi=old_map on its command line. Same old
1074  * method enabled the runtime services to be called without having to
1075  * thunk back into physical mode for every invocation.
1076  *
1077  * The new method does a pagetable switch in a preemption-safe manner
1078  * so that we're in a different address space when calling a runtime
1079  * function. For function arguments passing we do copy the PGDs of the
1080  * kernel page table into ->trampoline_pgd prior to each call.
1081  *
1082  * Specially for kexec boot, efi runtime maps in previous kernel should
1083  * be passed in via setup_data. In that case runtime ranges will be mapped
1084  * to the same virtual addresses as the first kernel, see
1085  * kexec_enter_virtual_mode().
1086  */
1087 static void __init __efi_enter_virtual_mode(void)
1088 {
1089         int count = 0, pg_shift = 0;
1090         void *new_memmap = NULL;
1091         efi_status_t status;
1092
1093         efi.systab = NULL;
1094
1095         efi_merge_regions();
1096         new_memmap = efi_map_regions(&count, &pg_shift);
1097         if (!new_memmap) {
1098                 pr_err("Error reallocating memory, EFI runtime non-functional!\n");
1099                 return;
1100         }
1101
1102         save_runtime_map();
1103
1104         BUG_ON(!efi.systab);
1105
1106         if (efi_setup_page_tables(__pa(new_memmap), 1 << pg_shift))
1107                 return;
1108
1109         efi_sync_low_kernel_mappings();
1110         efi_dump_pagetable();
1111
1112         if (efi_is_native()) {
1113                 status = phys_efi_set_virtual_address_map(
1114                                 memmap.desc_size * count,
1115                                 memmap.desc_size,
1116                                 memmap.desc_version,
1117                                 (efi_memory_desc_t *)__pa(new_memmap));
1118         } else {
1119                 status = efi_thunk_set_virtual_address_map(
1120                                 efi_phys.set_virtual_address_map,
1121                                 memmap.desc_size * count,
1122                                 memmap.desc_size,
1123                                 memmap.desc_version,
1124                                 (efi_memory_desc_t *)__pa(new_memmap));
1125         }
1126
1127         if (status != EFI_SUCCESS) {
1128                 pr_alert("Unable to switch EFI into virtual mode (status=%lx)!\n",
1129                          status);
1130                 panic("EFI call to SetVirtualAddressMap() failed!");
1131         }
1132
1133         /*
1134          * Now that EFI is in virtual mode, update the function
1135          * pointers in the runtime service table to the new virtual addresses.
1136          *
1137          * Call EFI services through wrapper functions.
1138          */
1139         efi.runtime_version = efi_systab.hdr.revision;
1140
1141         if (efi_is_native())
1142                 native_runtime_setup();
1143         else
1144                 efi_thunk_runtime_setup();
1145
1146         efi.set_virtual_address_map = NULL;
1147
1148         efi_runtime_mkexec();
1149
1150         /*
1151          * We mapped the descriptor array into the EFI pagetable above but we're
1152          * not unmapping it here. Here's why:
1153          *
1154          * We're copying select PGDs from the kernel page table to the EFI page
1155          * table and when we do so and make changes to those PGDs like unmapping
1156          * stuff from them, those changes appear in the kernel page table and we
1157          * go boom.
1158          *
1159          * From setup_real_mode():
1160          *
1161          * ...
1162          * trampoline_pgd[0] = init_level4_pgt[pgd_index(__PAGE_OFFSET)].pgd;
1163          *
1164          * In this particular case, our allocation is in PGD 0 of the EFI page
1165          * table but we've copied that PGD from PGD[272] of the EFI page table:
1166          *
1167          *      pgd_index(__PAGE_OFFSET = 0xffff880000000000) = 272
1168          *
1169          * where the direct memory mapping in kernel space is.
1170          *
1171          * new_memmap's VA comes from that direct mapping and thus clearing it,
1172          * it would get cleared in the kernel page table too.
1173          *
1174          * efi_cleanup_page_tables(__pa(new_memmap), 1 << pg_shift);
1175          */
1176         free_pages((unsigned long)new_memmap, pg_shift);
1177
1178         /* clean DUMMY object */
1179         efi.set_variable(efi_dummy_name, &EFI_DUMMY_GUID,
1180                          EFI_VARIABLE_NON_VOLATILE |
1181                          EFI_VARIABLE_BOOTSERVICE_ACCESS |
1182                          EFI_VARIABLE_RUNTIME_ACCESS,
1183                          0, NULL);
1184 }
1185
1186 void __init efi_enter_virtual_mode(void)
1187 {
1188         if (efi_setup)
1189                 kexec_enter_virtual_mode();
1190         else
1191                 __efi_enter_virtual_mode();
1192 }
1193
1194 /*
1195  * Convenience functions to obtain memory types and attributes
1196  */
1197 u32 efi_mem_type(unsigned long phys_addr)
1198 {
1199         efi_memory_desc_t *md;
1200         void *p;
1201
1202         if (!efi_enabled(EFI_MEMMAP))
1203                 return 0;
1204
1205         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
1206                 md = p;
1207                 if ((md->phys_addr <= phys_addr) &&
1208                     (phys_addr < (md->phys_addr +
1209                                   (md->num_pages << EFI_PAGE_SHIFT))))
1210                         return md->type;
1211         }
1212         return 0;
1213 }
1214
1215 u64 efi_mem_attributes(unsigned long phys_addr)
1216 {
1217         efi_memory_desc_t *md;
1218         void *p;
1219
1220         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
1221                 md = p;
1222                 if ((md->phys_addr <= phys_addr) &&
1223                     (phys_addr < (md->phys_addr +
1224                                   (md->num_pages << EFI_PAGE_SHIFT))))
1225                         return md->attribute;
1226         }
1227         return 0;
1228 }
1229
1230 /*
1231  * Some firmware implementations refuse to boot if there's insufficient space
1232  * in the variable store. Ensure that we never use more than a safe limit.
1233  *
1234  * Return EFI_SUCCESS if it is safe to write 'size' bytes to the variable
1235  * store.
1236  */
1237 efi_status_t efi_query_variable_store(u32 attributes, unsigned long size)
1238 {
1239         efi_status_t status;
1240         u64 storage_size, remaining_size, max_size;
1241
1242         if (!(attributes & EFI_VARIABLE_NON_VOLATILE))
1243                 return 0;
1244
1245         status = efi.query_variable_info(attributes, &storage_size,
1246                                          &remaining_size, &max_size);
1247         if (status != EFI_SUCCESS)
1248                 return status;
1249
1250         /*
1251          * We account for that by refusing the write if permitting it would
1252          * reduce the available space to under 5KB. This figure was provided by
1253          * Samsung, so should be safe.
1254          */
1255         if ((remaining_size - size < EFI_MIN_RESERVE) &&
1256                 !efi_no_storage_paranoia) {
1257
1258                 /*
1259                  * Triggering garbage collection may require that the firmware
1260                  * generate a real EFI_OUT_OF_RESOURCES error. We can force
1261                  * that by attempting to use more space than is available.
1262                  */
1263                 unsigned long dummy_size = remaining_size + 1024;
1264                 void *dummy = kzalloc(dummy_size, GFP_ATOMIC);
1265
1266                 if (!dummy)
1267                         return EFI_OUT_OF_RESOURCES;
1268
1269                 status = efi.set_variable(efi_dummy_name, &EFI_DUMMY_GUID,
1270                                           EFI_VARIABLE_NON_VOLATILE |
1271                                           EFI_VARIABLE_BOOTSERVICE_ACCESS |
1272                                           EFI_VARIABLE_RUNTIME_ACCESS,
1273                                           dummy_size, dummy);
1274
1275                 if (status == EFI_SUCCESS) {
1276                         /*
1277                          * This should have failed, so if it didn't make sure
1278                          * that we delete it...
1279                          */
1280                         efi.set_variable(efi_dummy_name, &EFI_DUMMY_GUID,
1281                                          EFI_VARIABLE_NON_VOLATILE |
1282                                          EFI_VARIABLE_BOOTSERVICE_ACCESS |
1283                                          EFI_VARIABLE_RUNTIME_ACCESS,
1284                                          0, dummy);
1285                 }
1286
1287                 kfree(dummy);
1288
1289                 /*
1290                  * The runtime code may now have triggered a garbage collection
1291                  * run, so check the variable info again
1292                  */
1293                 status = efi.query_variable_info(attributes, &storage_size,
1294                                                  &remaining_size, &max_size);
1295
1296                 if (status != EFI_SUCCESS)
1297                         return status;
1298
1299                 /*
1300                  * There still isn't enough room, so return an error
1301                  */
1302                 if (remaining_size - size < EFI_MIN_RESERVE)
1303                         return EFI_OUT_OF_RESOURCES;
1304         }
1305
1306         return EFI_SUCCESS;
1307 }
1308 EXPORT_SYMBOL_GPL(efi_query_variable_store);
1309
1310 static int __init parse_efi_cmdline(char *str)
1311 {
1312         if (*str == '=')
1313                 str++;
1314
1315         if (!strncmp(str, "old_map", 7))
1316                 set_bit(EFI_OLD_MEMMAP, &efi.flags);
1317
1318         return 0;
1319 }
1320 early_param("efi", parse_efi_cmdline);
1321
1322 void __init efi_apply_memmap_quirks(void)
1323 {
1324         /*
1325          * Once setup is done earlier, unmap the EFI memory map on mismatched
1326          * firmware/kernel architectures since there is no support for runtime
1327          * services.
1328          */
1329         if (!efi_runtime_supported()) {
1330                 pr_info("efi: Setup done, disabling due to 32/64-bit mismatch\n");
1331                 efi_unmap_memmap();
1332         }
1333
1334         /*
1335          * UV doesn't support the new EFI pagetable mapping yet.
1336          */
1337         if (is_uv_system())
1338                 set_bit(EFI_OLD_MEMMAP, &efi.flags);
1339 }