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_virt2(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_virt1(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_virt3(get_wakeup_time,
 138                                 enabled, pending, tm);
 139         spin_unlock_irqrestore(&rtc_lock, flags);
 140         return status;
 141 }
 142
 143 static efi_status_t virt_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
 144 {
 145         unsigned long flags;
 146         efi_status_t status;
 147
 148         spin_lock_irqsave(&rtc_lock, flags);
 149         status = efi_call_virt2(set_wakeup_time,
 150                                 enabled, tm);
 151         spin_unlock_irqrestore(&rtc_lock, flags);
 152         return status;
 153 }
 154
 155 static efi_status_t virt_efi_get_variable(efi_char16_t *name,
 156                                           efi_guid_t *vendor,
 157                                           u32 *attr,
 158                                           unsigned long *data_size,
 159                                           void *data)
 160 {
 161         return efi_call_virt5(get_variable,
 162                               name, vendor, attr,
 163                               data_size, data);
 164 }
 165
 166 static efi_status_t virt_efi_get_next_variable(unsigned long *name_size,
 167                                                efi_char16_t *name,
 168                                                efi_guid_t *vendor)
 169 {
 170         return efi_call_virt3(get_next_variable,
 171                               name_size, name, vendor);
 172 }
 173
 174 static efi_status_t virt_efi_set_variable(efi_char16_t *name,
 175                                           efi_guid_t *vendor,
 176                                           u32 attr,
 177                                           unsigned long data_size,
 178                                           void *data)
 179 {
 180         return efi_call_virt5(set_variable,
 181                               name, vendor, attr,
 182                               data_size, data);
 183 }
 184
 185 static efi_status_t virt_efi_query_variable_info(u32 attr,
 186                                                  u64 *storage_space,
 187                                                  u64 *remaining_space,
 188                                                  u64 *max_variable_size)
 189 {
 190         if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
 191                 return EFI_UNSUPPORTED;
 192
 193         return efi_call_virt4(query_variable_info, attr, storage_space,
 194                               remaining_space, max_variable_size);
 195 }
 196
 197 static efi_status_t virt_efi_get_next_high_mono_count(u32 *count)
 198 {
 199         return efi_call_virt1(get_next_high_mono_count, count);
 200 }
 201
 202 static void virt_efi_reset_system(int reset_type,
 203                                   efi_status_t status,
 204                                   unsigned long data_size,
 205                                   efi_char16_t *data)
 206 {
 207         efi_call_virt4(reset_system, reset_type, status,
 208                        data_size, data);
 209 }
 210
 211 static efi_status_t virt_efi_update_capsule(efi_capsule_header_t **capsules,
 212                                             unsigned long count,
 213                                             unsigned long sg_list)
 214 {
 215         if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
 216                 return EFI_UNSUPPORTED;
 217
 218         return efi_call_virt3(update_capsule, capsules, count, sg_list);
 219 }
 220
 221 static efi_status_t virt_efi_query_capsule_caps(efi_capsule_header_t **capsules,
 222                                                 unsigned long count,
 223                                                 u64 *max_size,
 224                                                 int *reset_type)
 225 {
 226         if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
 227                 return EFI_UNSUPPORTED;
 228
 229         return efi_call_virt4(query_capsule_caps, capsules, count, max_size,
 230                               reset_type);
 231 }
 232
 233 static efi_status_t __init phys_efi_set_virtual_address_map(
 234         unsigned long memory_map_size,
 235         unsigned long descriptor_size,
 236         u32 descriptor_version,
 237         efi_memory_desc_t *virtual_map)
 238 {
 239         efi_status_t status;
 240
 241         efi_call_phys_prelog();
 242         status = efi_call_phys4(efi_phys.set_virtual_address_map,
 243                                 memory_map_size, descriptor_size,
 244                                 descriptor_version, virtual_map);
 245         efi_call_phys_epilog();
 246         return status;
 247 }
 248
 249 int efi_set_rtc_mmss(const struct timespec *now)
 250 {
 251         unsigned long nowtime = now->tv_sec;
 252         efi_status_t    status;
 253         efi_time_t      eft;
 254         efi_time_cap_t  cap;
 255         struct rtc_time tm;
 256
 257         status = efi.get_time(&eft, &cap);
 258         if (status != EFI_SUCCESS) {
 259                 pr_err("Oops: efitime: can't read time!\n");
 260                 return -1;
 261         }
 262
 263         rtc_time_to_tm(nowtime, &tm);
 264         if (!rtc_valid_tm(&tm)) {
 265                 eft.year = tm.tm_year + 1900;
 266                 eft.month = tm.tm_mon + 1;
 267                 eft.day = tm.tm_mday;
 268                 eft.minute = tm.tm_min;
 269                 eft.second = tm.tm_sec;
 270                 eft.nanosecond = 0;
 271         } else {
 272                 pr_err("%s: Invalid EFI RTC value: write of %lx to EFI RTC failed\n",
 273                        __func__, nowtime);
 274                 return -1;
 275         }
 276
 277         status = efi.set_time(&eft);
 278         if (status != EFI_SUCCESS) {
 279                 pr_err("Oops: efitime: can't write time!\n");
 280                 return -1;
 281         }
 282         return 0;
 283 }
 284
 285 void efi_get_time(struct timespec *now)
 286 {
 287         efi_status_t status;
 288         efi_time_t eft;
 289         efi_time_cap_t cap;
 290
 291         status = efi.get_time(&eft, &cap);
 292         if (status != EFI_SUCCESS)
 293                 pr_err("Oops: efitime: can't read time!\n");
 294
 295         now->tv_sec = mktime(eft.year, eft.month, eft.day, eft.hour,
 296                              eft.minute, eft.second);
 297         now->tv_nsec = 0;
 298 }
 299
 300 /*
 301  * Tell the kernel about the EFI memory map.  This might include
 302  * more than the max 128 entries that can fit in the e820 legacy
 303  * (zeropage) memory map.
 304  */
 305
 306 static void __init do_add_efi_memmap(void)
 307 {
 308         void *p;
 309
 310         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 311                 efi_memory_desc_t *md = p;
 312                 unsigned long long start = md->phys_addr;
 313                 unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
 314                 int e820_type;
 315
 316                 switch (md->type) {
 317                 case EFI_LOADER_CODE:
 318                 case EFI_LOADER_DATA:
 319                 case EFI_BOOT_SERVICES_CODE:
 320                 case EFI_BOOT_SERVICES_DATA:
 321                 case EFI_CONVENTIONAL_MEMORY:
 322                         if (md->attribute & EFI_MEMORY_WB)
 323                                 e820_type = E820_RAM;
 324                         else
 325                                 e820_type = E820_RESERVED;
 326                         break;
 327                 case EFI_ACPI_RECLAIM_MEMORY:
 328                         e820_type = E820_ACPI;
 329                         break;
 330                 case EFI_ACPI_MEMORY_NVS:
 331                         e820_type = E820_NVS;
 332                         break;
 333                 case EFI_UNUSABLE_MEMORY:
 334                         e820_type = E820_UNUSABLE;
 335                         break;
 336                 default:
 337                         /*
 338                          * EFI_RESERVED_TYPE EFI_RUNTIME_SERVICES_CODE
 339                          * EFI_RUNTIME_SERVICES_DATA EFI_MEMORY_MAPPED_IO
 340                          * EFI_MEMORY_MAPPED_IO_PORT_SPACE EFI_PAL_CODE
 341                          */
 342                         e820_type = E820_RESERVED;
 343                         break;
 344                 }
 345                 e820_add_region(start, size, e820_type);
 346         }
 347         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 348 }
 349
 350 int __init efi_memblock_x86_reserve_range(void)
 351 {
 352         struct efi_info *e = &boot_params.efi_info;
 353         unsigned long pmap;
 354
 355 #ifdef CONFIG_X86_32
 356         /* Can't handle data above 4GB at this time */
 357         if (e->efi_memmap_hi) {
 358                 pr_err("Memory map is above 4GB, disabling EFI.\n");
 359                 return -EINVAL;
 360         }
 361         pmap =  e->efi_memmap;
 362 #else
 363         pmap = (e->efi_memmap | ((__u64)e->efi_memmap_hi << 32));
 364 #endif
 365         memmap.phys_map         = (void *)pmap;
 366         memmap.nr_map           = e->efi_memmap_size /
 367                                   e->efi_memdesc_size;
 368         memmap.desc_size        = e->efi_memdesc_size;
 369         memmap.desc_version     = e->efi_memdesc_version;
 370
 371         memblock_reserve(pmap, memmap.nr_map * memmap.desc_size);
 372
 373         efi.memmap = &memmap;
 374
 375         return 0;
 376 }
 377
 378 static void __init print_efi_memmap(void)
 379 {
 380 #ifdef EFI_DEBUG
 381         efi_memory_desc_t *md;
 382         void *p;
 383         int i;
 384
 385         for (p = memmap.map, i = 0;
 386              p < memmap.map_end;
 387              p += memmap.desc_size, i++) {
 388                 md = p;
 389                 pr_info("mem%02u: type=%u, attr=0x%llx, range=[0x%016llx-0x%016llx) (%lluMB)\n",
 390                         i, md->type, md->attribute, md->phys_addr,
 391                         md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
 392                         (md->num_pages >> (20 - EFI_PAGE_SHIFT)));
 393         }
 394 #endif  /*  EFI_DEBUG  */
 395 }
 396
 397 void __init efi_reserve_boot_services(void)
 398 {
 399         void *p;
 400
 401         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 402                 efi_memory_desc_t *md = p;
 403                 u64 start = md->phys_addr;
 404                 u64 size = md->num_pages << EFI_PAGE_SHIFT;
 405
 406                 if (md->type != EFI_BOOT_SERVICES_CODE &&
 407                     md->type != EFI_BOOT_SERVICES_DATA)
 408                         continue;
 409                 /* Only reserve where possible:
 410                  * - Not within any already allocated areas
 411                  * - Not over any memory area (really needed, if above?)
 412                  * - Not within any part of the kernel
 413                  * - Not the bios reserved area
 414                 */
 415                 if ((start + size > __pa_symbol(_text)
 416                                 && start <= __pa_symbol(_end)) ||
 417                         !e820_all_mapped(start, start+size, E820_RAM) ||
 418                         memblock_is_region_reserved(start, size)) {
 419                         /* Could not reserve, skip it */
 420                         md->num_pages = 0;
 421                         memblock_dbg("Could not reserve boot range [0x%010llx-0x%010llx]\n",
 422                                      start, start+size-1);
 423                 } else
 424                         memblock_reserve(start, size);
 425         }
 426 }
 427
 428 void __init efi_unmap_memmap(void)
 429 {
 430         clear_bit(EFI_MEMMAP, &efi.flags);
 431         if (memmap.map) {
 432                 early_iounmap(memmap.map, memmap.nr_map * memmap.desc_size);
 433                 memmap.map = NULL;
 434         }
 435 }
 436
 437 void __init efi_free_boot_services(void)
 438 {
 439         void *p;
 440
 441         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 442                 efi_memory_desc_t *md = p;
 443                 unsigned long long start = md->phys_addr;
 444                 unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
 445
 446                 if (md->type != EFI_BOOT_SERVICES_CODE &&
 447                     md->type != EFI_BOOT_SERVICES_DATA)
 448                         continue;
 449
 450                 /* Could not reserve boot area */
 451                 if (!size)
 452                         continue;
 453
 454                 free_bootmem_late(start, size);
 455         }
 456
 457         efi_unmap_memmap();
 458 }
 459
 460 static int __init efi_systab_init(void *phys)
 461 {
 462         if (efi_enabled(EFI_64BIT)) {
 463                 efi_system_table_64_t *systab64;
 464                 struct efi_setup_data *data = NULL;
 465                 u64 tmp = 0;
 466
 467                 if (efi_setup) {
 468                         data = early_memremap(efi_setup, sizeof(*data));
 469                         if (!data)
 470                                 return -ENOMEM;
 471                 }
 472                 systab64 = early_ioremap((unsigned long)phys,
 473                                          sizeof(*systab64));
 474                 if (systab64 == NULL) {
 475                         pr_err("Couldn't map the system table!\n");
 476                         if (data)
 477                                 early_iounmap(data, sizeof(*data));
 478                         return -ENOMEM;
 479                 }
 480
 481                 efi_systab.hdr = systab64->hdr;
 482                 efi_systab.fw_vendor = data ? (unsigned long)data->fw_vendor :
 483                                               systab64->fw_vendor;
 484                 tmp |= data ? data->fw_vendor : systab64->fw_vendor;
 485                 efi_systab.fw_revision = systab64->fw_revision;
 486                 efi_systab.con_in_handle = systab64->con_in_handle;
 487                 tmp |= systab64->con_in_handle;
 488                 efi_systab.con_in = systab64->con_in;
 489                 tmp |= systab64->con_in;
 490                 efi_systab.con_out_handle = systab64->con_out_handle;
 491                 tmp |= systab64->con_out_handle;
 492                 efi_systab.con_out = systab64->con_out;
 493                 tmp |= systab64->con_out;
 494                 efi_systab.stderr_handle = systab64->stderr_handle;
 495                 tmp |= systab64->stderr_handle;
 496                 efi_systab.stderr = systab64->stderr;
 497                 tmp |= systab64->stderr;
 498                 efi_systab.runtime = data ?
 499                                      (void *)(unsigned long)data->runtime :
 500                                      (void *)(unsigned long)systab64->runtime;
 501                 tmp |= data ? data->runtime : systab64->runtime;
 502                 efi_systab.boottime = (void *)(unsigned long)systab64->boottime;
 503                 tmp |= systab64->boottime;
 504                 efi_systab.nr_tables = systab64->nr_tables;
 505                 efi_systab.tables = data ? (unsigned long)data->tables :
 506                                            systab64->tables;
 507                 tmp |= data ? data->tables : systab64->tables;
 508
 509                 early_iounmap(systab64, sizeof(*systab64));
 510                 if (data)
 511                         early_iounmap(data, sizeof(*data));
 512 #ifdef CONFIG_X86_32
 513                 if (tmp >> 32) {
 514                         pr_err("EFI data located above 4GB, disabling EFI.\n");
 515                         return -EINVAL;
 516                 }
 517 #endif
 518         } else {
 519                 efi_system_table_32_t *systab32;
 520
 521                 systab32 = early_ioremap((unsigned long)phys,
 522                                          sizeof(*systab32));
 523                 if (systab32 == NULL) {
 524                         pr_err("Couldn't map the system table!\n");
 525                         return -ENOMEM;
 526                 }
 527
 528                 efi_systab.hdr = systab32->hdr;
 529                 efi_systab.fw_vendor = systab32->fw_vendor;
 530                 efi_systab.fw_revision = systab32->fw_revision;
 531                 efi_systab.con_in_handle = systab32->con_in_handle;
 532                 efi_systab.con_in = systab32->con_in;
 533                 efi_systab.con_out_handle = systab32->con_out_handle;
 534                 efi_systab.con_out = systab32->con_out;
 535                 efi_systab.stderr_handle = systab32->stderr_handle;
 536                 efi_systab.stderr = systab32->stderr;
 537                 efi_systab.runtime = (void *)(unsigned long)systab32->runtime;
 538                 efi_systab.boottime = (void *)(unsigned long)systab32->boottime;
 539                 efi_systab.nr_tables = systab32->nr_tables;
 540                 efi_systab.tables = systab32->tables;
 541
 542                 early_iounmap(systab32, sizeof(*systab32));
 543         }
 544
 545         efi.systab = &efi_systab;
 546
 547         /*
 548          * Verify the EFI Table
 549          */
 550         if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) {
 551                 pr_err("System table signature incorrect!\n");
 552                 return -EINVAL;
 553         }
 554         if ((efi.systab->hdr.revision >> 16) == 0)
 555                 pr_err("Warning: System table version %d.%02d, expected 1.00 or greater!\n",
 556                        efi.systab->hdr.revision >> 16,
 557                        efi.systab->hdr.revision & 0xffff);
 558
 559         set_bit(EFI_SYSTEM_TABLES, &efi.flags);
 560
 561         return 0;
 562 }
 563
 564 static int __init efi_runtime_init32(void)
 565 {
 566         efi_runtime_services_32_t *runtime;
 567
 568         runtime = early_ioremap((unsigned long)efi.systab->runtime,
 569                         sizeof(efi_runtime_services_32_t));
 570         if (!runtime) {
 571                 pr_err("Could not map the runtime service table!\n");
 572                 return -ENOMEM;
 573         }
 574
 575         /*
 576          * We will only need *early* access to the following two
 577          * EFI runtime services before set_virtual_address_map
 578          * is invoked.
 579          */
 580         efi_phys.set_virtual_address_map =
 581                         (efi_set_virtual_address_map_t *)
 582                         (unsigned long)runtime->set_virtual_address_map;
 583         early_iounmap(runtime, sizeof(efi_runtime_services_32_t));
 584
 585         return 0;
 586 }
 587
 588 static int __init efi_runtime_init64(void)
 589 {
 590         efi_runtime_services_64_t *runtime;
 591
 592         runtime = early_ioremap((unsigned long)efi.systab->runtime,
 593                         sizeof(efi_runtime_services_64_t));
 594         if (!runtime) {
 595                 pr_err("Could not map the runtime service table!\n");
 596                 return -ENOMEM;
 597         }
 598
 599         /*
 600          * We will only need *early* access to the following two
 601          * EFI runtime services before set_virtual_address_map
 602          * is invoked.
 603          */
 604         efi_phys.set_virtual_address_map =
 605                         (efi_set_virtual_address_map_t *)
 606                         (unsigned long)runtime->set_virtual_address_map;
 607         early_iounmap(runtime, sizeof(efi_runtime_services_64_t));
 608
 609         return 0;
 610 }
 611
 612 static int __init efi_runtime_init(void)
 613 {
 614         int rv;
 615
 616         /*
 617          * Check out the runtime services table. We need to map
 618          * the runtime services table so that we can grab the physical
 619          * address of several of the EFI runtime functions, needed to
 620          * set the firmware into virtual mode.
 621          */
 622         if (efi_enabled(EFI_64BIT))
 623                 rv = efi_runtime_init64();
 624         else
 625                 rv = efi_runtime_init32();
 626
 627         if (rv)
 628                 return rv;
 629
 630         set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
 631
 632         return 0;
 633 }
 634
 635 static int __init efi_memmap_init(void)
 636 {
 637         /* Map the EFI memory map */
 638         memmap.map = early_ioremap((unsigned long)memmap.phys_map,
 639                                    memmap.nr_map * memmap.desc_size);
 640         if (memmap.map == NULL) {
 641                 pr_err("Could not map the memory map!\n");
 642                 return -ENOMEM;
 643         }
 644         memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
 645
 646         if (add_efi_memmap)
 647                 do_add_efi_memmap();
 648
 649         set_bit(EFI_MEMMAP, &efi.flags);
 650
 651         return 0;
 652 }
 653
 654 /*
 655  * A number of config table entries get remapped to virtual addresses
 656  * after entering EFI virtual mode. However, the kexec kernel requires
 657  * their physical addresses therefore we pass them via setup_data and
 658  * correct those entries to their respective physical addresses here.
 659  *
 660  * Currently only handles smbios which is necessary for some firmware
 661  * implementation.
 662  */
 663 static int __init efi_reuse_config(u64 tables, int nr_tables)
 664 {
 665         int i, sz, ret = 0;
 666         void *p, *tablep;
 667         struct efi_setup_data *data;
 668
 669         if (!efi_setup)
 670                 return 0;
 671
 672         if (!efi_enabled(EFI_64BIT))
 673                 return 0;
 674
 675         data = early_memremap(efi_setup, sizeof(*data));
 676         if (!data) {
 677                 ret = -ENOMEM;
 678                 goto out;
 679         }
 680
 681         if (!data->smbios)
 682                 goto out_memremap;
 683
 684         sz = sizeof(efi_config_table_64_t);
 685
 686         p = tablep = early_memremap(tables, nr_tables * sz);
 687         if (!p) {
 688                 pr_err("Could not map Configuration table!\n");
 689                 ret = -ENOMEM;
 690                 goto out_memremap;
 691         }
 692
 693         for (i = 0; i < efi.systab->nr_tables; i++) {
 694                 efi_guid_t guid;
 695
 696                 guid = ((efi_config_table_64_t *)p)->guid;
 697
 698                 if (!efi_guidcmp(guid, SMBIOS_TABLE_GUID))
 699                         ((efi_config_table_64_t *)p)->table = data->smbios;
 700                 p += sz;
 701         }
 702         early_iounmap(tablep, nr_tables * sz);
 703
 704 out_memremap:
 705         early_iounmap(data, sizeof(*data));
 706 out:
 707         return ret;
 708 }
 709
 710 void __init efi_init(void)
 711 {
 712         efi_char16_t *c16;
 713         char vendor[100] = "unknown";
 714         int i = 0;
 715         void *tmp;
 716
 717 #ifdef CONFIG_X86_32
 718         if (boot_params.efi_info.efi_systab_hi ||
 719             boot_params.efi_info.efi_memmap_hi) {
 720                 pr_info("Table located above 4GB, disabling EFI.\n");
 721                 return;
 722         }
 723         efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab;
 724 #else
 725         efi_phys.systab = (efi_system_table_t *)
 726                           (boot_params.efi_info.efi_systab |
 727                           ((__u64)boot_params.efi_info.efi_systab_hi<<32));
 728 #endif
 729
 730         if (efi_systab_init(efi_phys.systab))
 731                 return;
 732
 733         set_bit(EFI_SYSTEM_TABLES, &efi.flags);
 734
 735         efi.config_table = (unsigned long)efi.systab->tables;
 736         efi.fw_vendor    = (unsigned long)efi.systab->fw_vendor;
 737         efi.runtime      = (unsigned long)efi.systab->runtime;
 738
 739         /*
 740          * Show what we know for posterity
 741          */
 742         c16 = tmp = early_ioremap(efi.systab->fw_vendor, 2);
 743         if (c16) {
 744                 for (i = 0; i < sizeof(vendor) - 1 && *c16; ++i)
 745                         vendor[i] = *c16++;
 746                 vendor[i] = '\0';
 747         } else
 748                 pr_err("Could not map the firmware vendor!\n");
 749         early_iounmap(tmp, 2);
 750
 751         pr_info("EFI v%u.%.02u by %s\n",
 752                 efi.systab->hdr.revision >> 16,
 753                 efi.systab->hdr.revision & 0xffff, vendor);
 754
 755         if (efi_reuse_config(efi.systab->tables, efi.systab->nr_tables))
 756                 return;
 757
 758         if (efi_config_init(arch_tables))
 759                 return;
 760
 761         /*
 762          * Note: We currently don't support runtime services on an EFI
 763          * that doesn't match the kernel 32/64-bit mode.
 764          */
 765
 766         if (!efi_runtime_supported())
 767                 pr_info("No EFI runtime due to 32/64-bit mismatch with kernel\n");
 768         else {
 769                 if (disable_runtime || efi_runtime_init())
 770                         return;
 771         }
 772         if (efi_memmap_init())
 773                 return;
 774
 775         set_bit(EFI_MEMMAP, &efi.flags);
 776
 777         print_efi_memmap();
 778 }
 779
 780 void __init efi_late_init(void)
 781 {
 782         efi_bgrt_init();
 783 }
 784
 785 void __init efi_set_executable(efi_memory_desc_t *md, bool executable)
 786 {
 787         u64 addr, npages;
 788
 789         addr = md->virt_addr;
 790         npages = md->num_pages;
 791
 792         memrange_efi_to_native(&addr, &npages);
 793
 794         if (executable)
 795                 set_memory_x(addr, npages);
 796         else
 797                 set_memory_nx(addr, npages);
 798 }
 799
 800 void __init runtime_code_page_mkexec(void)
 801 {
 802         efi_memory_desc_t *md;
 803         void *p;
 804
 805         /* Make EFI runtime service code area executable */
 806         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 807                 md = p;
 808
 809                 if (md->type != EFI_RUNTIME_SERVICES_CODE)
 810                         continue;
 811
 812                 efi_set_executable(md, true);
 813         }
 814 }
 815
 816 void efi_memory_uc(u64 addr, unsigned long size)
 817 {
 818         unsigned long page_shift = 1UL << EFI_PAGE_SHIFT;
 819         u64 npages;
 820
 821         npages = round_up(size, page_shift) / page_shift;
 822         memrange_efi_to_native(&addr, &npages);
 823         set_memory_uc(addr, npages);
 824 }
 825
 826 void __init old_map_region(efi_memory_desc_t *md)
 827 {
 828         u64 start_pfn, end_pfn, end;
 829         unsigned long size;
 830         void *va;
 831
 832         start_pfn = PFN_DOWN(md->phys_addr);
 833         size      = md->num_pages << PAGE_SHIFT;
 834         end       = md->phys_addr + size;
 835         end_pfn   = PFN_UP(end);
 836
 837         if (pfn_range_is_mapped(start_pfn, end_pfn)) {
 838                 va = __va(md->phys_addr);
 839
 840                 if (!(md->attribute & EFI_MEMORY_WB))
 841                         efi_memory_uc((u64)(unsigned long)va, size);
 842         } else
 843                 va = efi_ioremap(md->phys_addr, size,
 844                                  md->type, md->attribute);
 845
 846         md->virt_addr = (u64) (unsigned long) va;
 847         if (!va)
 848                 pr_err("ioremap of 0x%llX failed!\n",
 849                        (unsigned long long)md->phys_addr);
 850 }
 851
 852 static void native_runtime_setup(void)
 853 {
 854         efi.get_time = virt_efi_get_time;
 855         efi.set_time = virt_efi_set_time;
 856         efi.get_wakeup_time = virt_efi_get_wakeup_time;
 857         efi.set_wakeup_time = virt_efi_set_wakeup_time;
 858         efi.get_variable = virt_efi_get_variable;
 859         efi.get_next_variable = virt_efi_get_next_variable;
 860         efi.set_variable = virt_efi_set_variable;
 861         efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count;
 862         efi.reset_system = virt_efi_reset_system;
 863         efi.query_variable_info = virt_efi_query_variable_info;
 864         efi.update_capsule = virt_efi_update_capsule;
 865         efi.query_capsule_caps = virt_efi_query_capsule_caps;
 866 }
 867
 868 /* Merge contiguous regions of the same type and attribute */
 869 static void __init efi_merge_regions(void)
 870 {
 871         void *p;
 872         efi_memory_desc_t *md, *prev_md = NULL;
 873
 874         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 875                 u64 prev_size;
 876                 md = p;
 877
 878                 if (!prev_md) {
 879                         prev_md = md;
 880                         continue;
 881                 }
 882
 883                 if (prev_md->type != md->type ||
 884                     prev_md->attribute != md->attribute) {
 885                         prev_md = md;
 886                         continue;
 887                 }
 888
 889                 prev_size = prev_md->num_pages << EFI_PAGE_SHIFT;
 890
 891                 if (md->phys_addr == (prev_md->phys_addr + prev_size)) {
 892                         prev_md->num_pages += md->num_pages;
 893                         md->type = EFI_RESERVED_TYPE;
 894                         md->attribute = 0;
 895                         continue;
 896                 }
 897                 prev_md = md;
 898         }
 899 }
 900
 901 static void __init get_systab_virt_addr(efi_memory_desc_t *md)
 902 {
 903         unsigned long size;
 904         u64 end, systab;
 905
 906         size = md->num_pages << EFI_PAGE_SHIFT;
 907         end = md->phys_addr + size;
 908         systab = (u64)(unsigned long)efi_phys.systab;
 909         if (md->phys_addr <= systab && systab < end) {
 910                 systab += md->virt_addr - md->phys_addr;
 911                 efi.systab = (efi_system_table_t *)(unsigned long)systab;
 912         }
 913 }
 914
 915 static void __init save_runtime_map(void)
 916 {
 917 #ifdef CONFIG_KEXEC
 918         efi_memory_desc_t *md;
 919         void *tmp, *p, *q = NULL;
 920         int count = 0;
 921
 922         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 923                 md = p;
 924
 925                 if (!(md->attribute & EFI_MEMORY_RUNTIME) ||
 926                     (md->type == EFI_BOOT_SERVICES_CODE) ||
 927                     (md->type == EFI_BOOT_SERVICES_DATA))
 928                         continue;
 929                 tmp = krealloc(q, (count + 1) * memmap.desc_size, GFP_KERNEL);
 930                 if (!tmp)
 931                         goto out;
 932                 q = tmp;
 933
 934                 memcpy(q + count * memmap.desc_size, md, memmap.desc_size);
 935                 count++;
 936         }
 937
 938         efi_runtime_map_setup(q, count, memmap.desc_size);
 939         return;
 940
 941 out:
 942         kfree(q);
 943         pr_err("Error saving runtime map, efi runtime on kexec non-functional!!\n");
 944 #endif
 945 }
 946
 947 static void *realloc_pages(void *old_memmap, int old_shift)
 948 {
 949         void *ret;
 950
 951         ret = (void *)__get_free_pages(GFP_KERNEL, old_shift + 1);
 952         if (!ret)
 953                 goto out;
 954
 955         /*
 956          * A first-time allocation doesn't have anything to copy.
 957          */
 958         if (!old_memmap)
 959                 return ret;
 960
 961         memcpy(ret, old_memmap, PAGE_SIZE << old_shift);
 962
 963 out:
 964         free_pages((unsigned long)old_memmap, old_shift);
 965         return ret;
 966 }
 967
 968 /*
 969  * Map the efi memory ranges of the runtime services and update new_mmap with
 970  * virtual addresses.
 971  */
 972 static void * __init efi_map_regions(int *count, int *pg_shift)
 973 {
 974         void *p, *new_memmap = NULL;
 975         unsigned long left = 0;
 976         efi_memory_desc_t *md;
 977
 978         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 979                 md = p;
 980                 if (!(md->attribute & EFI_MEMORY_RUNTIME)) {
 981 #ifdef CONFIG_X86_64
 982                         if (md->type != EFI_BOOT_SERVICES_CODE &&
 983                             md->type != EFI_BOOT_SERVICES_DATA)
 984 #endif
 985                                 continue;
 986                 }
 987
 988                 efi_map_region(md);
 989                 get_systab_virt_addr(md);
 990
 991                 if (left < memmap.desc_size) {
 992                         new_memmap = realloc_pages(new_memmap, *pg_shift);
 993                         if (!new_memmap)
 994                                 return NULL;
 995
 996                         left += PAGE_SIZE << *pg_shift;
 997                         (*pg_shift)++;
 998                 }
 999
1000                 memcpy(new_memmap + (*count * memmap.desc_size), md,
1001                        memmap.desc_size);
1002
1003                 left -= memmap.desc_size;
1004                 (*count)++;
1005         }
1006
1007         return new_memmap;
1008 }
1009
1010 static void __init kexec_enter_virtual_mode(void)
1011 {
1012 #ifdef CONFIG_KEXEC
1013         efi_memory_desc_t *md;
1014         void *p;
1015
1016         efi.systab = NULL;
1017
1018         /*
1019          * We don't do virtual mode, since we don't do runtime services, on
1020          * non-native EFI
1021          */
1022         if (!efi_is_native()) {
1023                 efi_unmap_memmap();
1024                 return;
1025         }
1026
1027         /*
1028         * Map efi regions which were passed via setup_data. The virt_addr is a
1029         * fixed addr which was used in first kernel of a kexec boot.
1030         */
1031         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
1032                 md = p;
1033                 efi_map_region_fixed(md); /* FIXME: add error handling */
1034                 get_systab_virt_addr(md);
1035         }
1036
1037         save_runtime_map();
1038
1039         BUG_ON(!efi.systab);
1040
1041         efi_sync_low_kernel_mappings();
1042
1043         /*
1044          * Now that EFI is in virtual mode, update the function
1045          * pointers in the runtime service table to the new virtual addresses.
1046          *
1047          * Call EFI services through wrapper functions.
1048          */
1049         efi.runtime_version = efi_systab.hdr.revision;
1050
1051         native_runtime_setup();
1052
1053         efi.set_virtual_address_map = NULL;
1054
1055         if (efi_enabled(EFI_OLD_MEMMAP) && (__supported_pte_mask & _PAGE_NX))
1056                 runtime_code_page_mkexec();
1057
1058         /* clean DUMMY object */
1059         efi.set_variable(efi_dummy_name, &EFI_DUMMY_GUID,
1060                          EFI_VARIABLE_NON_VOLATILE |
1061                          EFI_VARIABLE_BOOTSERVICE_ACCESS |
1062                          EFI_VARIABLE_RUNTIME_ACCESS,
1063                          0, NULL);
1064 #endif
1065 }
1066
1067 /*
1068  * This function will switch the EFI runtime services to virtual mode.
1069  * Essentially, we look through the EFI memmap and map every region that
1070  * has the runtime attribute bit set in its memory descriptor into the
1071  * ->trampoline_pgd page table using a top-down VA allocation scheme.
1072  *
1073  * The old method which used to update that memory descriptor with the
1074  * virtual address obtained from ioremap() is still supported when the
1075  * kernel is booted with efi=old_map on its command line. Same old
1076  * method enabled the runtime services to be called without having to
1077  * thunk back into physical mode for every invocation.
1078  *
1079  * The new method does a pagetable switch in a preemption-safe manner
1080  * so that we're in a different address space when calling a runtime
1081  * function. For function arguments passing we do copy the PGDs of the
1082  * kernel page table into ->trampoline_pgd prior to each call.
1083  *
1084  * Specially for kexec boot, efi runtime maps in previous kernel should
1085  * be passed in via setup_data. In that case runtime ranges will be mapped
1086  * to the same virtual addresses as the first kernel, see
1087  * kexec_enter_virtual_mode().
1088  */
1089 static void __init __efi_enter_virtual_mode(void)
1090 {
1091         int count = 0, pg_shift = 0;
1092         void *new_memmap = NULL;
1093         efi_status_t status;
1094
1095         efi.systab = NULL;
1096
1097         efi_merge_regions();
1098         new_memmap = efi_map_regions(&count, &pg_shift);
1099         if (!new_memmap) {
1100                 pr_err("Error reallocating memory, EFI runtime non-functional!\n");
1101                 return;
1102         }
1103
1104         save_runtime_map();
1105
1106         BUG_ON(!efi.systab);
1107
1108         if (efi_setup_page_tables(__pa(new_memmap), 1 << pg_shift))
1109                 return;
1110
1111         efi_sync_low_kernel_mappings();
1112         efi_dump_pagetable();
1113
1114         if (efi_is_native()) {
1115                 status = phys_efi_set_virtual_address_map(
1116                                 memmap.desc_size * count,
1117                                 memmap.desc_size,
1118                                 memmap.desc_version,
1119                                 (efi_memory_desc_t *)__pa(new_memmap));
1120         } else {
1121                 status = efi_thunk_set_virtual_address_map(
1122                                 efi_phys.set_virtual_address_map,
1123                                 memmap.desc_size * count,
1124                                 memmap.desc_size,
1125                                 memmap.desc_version,
1126                                 (efi_memory_desc_t *)__pa(new_memmap));
1127         }
1128
1129         if (status != EFI_SUCCESS) {
1130                 pr_alert("Unable to switch EFI into virtual mode (status=%lx)!\n",
1131                          status);
1132                 panic("EFI call to SetVirtualAddressMap() failed!");
1133         }
1134
1135         /*
1136          * Now that EFI is in virtual mode, update the function
1137          * pointers in the runtime service table to the new virtual addresses.
1138          *
1139          * Call EFI services through wrapper functions.
1140          */
1141         efi.runtime_version = efi_systab.hdr.revision;
1142
1143         if (efi_is_native())
1144                 native_runtime_setup();
1145         else
1146                 efi_thunk_runtime_setup();
1147
1148         efi.set_virtual_address_map = NULL;
1149
1150         efi_runtime_mkexec();
1151
1152         /*
1153          * We mapped the descriptor array into the EFI pagetable above but we're
1154          * not unmapping it here. Here's why:
1155          *
1156          * We're copying select PGDs from the kernel page table to the EFI page
1157          * table and when we do so and make changes to those PGDs like unmapping
1158          * stuff from them, those changes appear in the kernel page table and we
1159          * go boom.
1160          *
1161          * From setup_real_mode():
1162          *
1163          * ...
1164          * trampoline_pgd[0] = init_level4_pgt[pgd_index(__PAGE_OFFSET)].pgd;
1165          *
1166          * In this particular case, our allocation is in PGD 0 of the EFI page
1167          * table but we've copied that PGD from PGD[272] of the EFI page table:
1168          *
1169          *      pgd_index(__PAGE_OFFSET = 0xffff880000000000) = 272
1170          *
1171          * where the direct memory mapping in kernel space is.
1172          *
1173          * new_memmap's VA comes from that direct mapping and thus clearing it,
1174          * it would get cleared in the kernel page table too.
1175          *
1176          * efi_cleanup_page_tables(__pa(new_memmap), 1 << pg_shift);
1177          */
1178         free_pages((unsigned long)new_memmap, pg_shift);
1179
1180         /* clean DUMMY object */
1181         efi.set_variable(efi_dummy_name, &EFI_DUMMY_GUID,
1182                          EFI_VARIABLE_NON_VOLATILE |
1183                          EFI_VARIABLE_BOOTSERVICE_ACCESS |
1184                          EFI_VARIABLE_RUNTIME_ACCESS,
1185                          0, NULL);
1186 }
1187
1188 void __init efi_enter_virtual_mode(void)
1189 {
1190         if (efi_setup)
1191                 kexec_enter_virtual_mode();
1192         else
1193                 __efi_enter_virtual_mode();
1194 }
1195
1196 /*
1197  * Convenience functions to obtain memory types and attributes
1198  */
1199 u32 efi_mem_type(unsigned long phys_addr)
1200 {
1201         efi_memory_desc_t *md;
1202         void *p;
1203
1204         if (!efi_enabled(EFI_MEMMAP))
1205                 return 0;
1206
1207         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
1208                 md = p;
1209                 if ((md->phys_addr <= phys_addr) &&
1210                     (phys_addr < (md->phys_addr +
1211                                   (md->num_pages << EFI_PAGE_SHIFT))))
1212                         return md->type;
1213         }
1214         return 0;
1215 }
1216
1217 u64 efi_mem_attributes(unsigned long phys_addr)
1218 {
1219         efi_memory_desc_t *md;
1220         void *p;
1221
1222         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
1223                 md = p;
1224                 if ((md->phys_addr <= phys_addr) &&
1225                     (phys_addr < (md->phys_addr +
1226                                   (md->num_pages << EFI_PAGE_SHIFT))))
1227                         return md->attribute;
1228         }
1229         return 0;
1230 }
1231
1232 /*
1233  * Some firmware implementations refuse to boot if there's insufficient space
1234  * in the variable store. Ensure that we never use more than a safe limit.
1235  *
1236  * Return EFI_SUCCESS if it is safe to write 'size' bytes to the variable
1237  * store.
1238  */
1239 efi_status_t efi_query_variable_store(u32 attributes, unsigned long size)
1240 {
1241         efi_status_t status;
1242         u64 storage_size, remaining_size, max_size;
1243
1244         if (!(attributes & EFI_VARIABLE_NON_VOLATILE))
1245                 return 0;
1246
1247         status = efi.query_variable_info(attributes, &storage_size,
1248                                          &remaining_size, &max_size);
1249         if (status != EFI_SUCCESS)
1250                 return status;
1251
1252         /*
1253          * We account for that by refusing the write if permitting it would
1254          * reduce the available space to under 5KB. This figure was provided by
1255          * Samsung, so should be safe.
1256          */
1257         if ((remaining_size - size < EFI_MIN_RESERVE) &&
1258                 !efi_no_storage_paranoia) {
1259
1260                 /*
1261                  * Triggering garbage collection may require that the firmware
1262                  * generate a real EFI_OUT_OF_RESOURCES error. We can force
1263                  * that by attempting to use more space than is available.
1264                  */
1265                 unsigned long dummy_size = remaining_size + 1024;
1266                 void *dummy = kzalloc(dummy_size, GFP_ATOMIC);
1267
1268                 if (!dummy)
1269                         return EFI_OUT_OF_RESOURCES;
1270
1271                 status = efi.set_variable(efi_dummy_name, &EFI_DUMMY_GUID,
1272                                           EFI_VARIABLE_NON_VOLATILE |
1273                                           EFI_VARIABLE_BOOTSERVICE_ACCESS |
1274                                           EFI_VARIABLE_RUNTIME_ACCESS,
1275                                           dummy_size, dummy);
1276
1277                 if (status == EFI_SUCCESS) {
1278                         /*
1279                          * This should have failed, so if it didn't make sure
1280                          * that we delete it...
1281                          */
1282                         efi.set_variable(efi_dummy_name, &EFI_DUMMY_GUID,
1283                                          EFI_VARIABLE_NON_VOLATILE |
1284                                          EFI_VARIABLE_BOOTSERVICE_ACCESS |
1285                                          EFI_VARIABLE_RUNTIME_ACCESS,
1286                                          0, dummy);
1287                 }
1288
1289                 kfree(dummy);
1290
1291                 /*
1292                  * The runtime code may now have triggered a garbage collection
1293                  * run, so check the variable info again
1294                  */
1295                 status = efi.query_variable_info(attributes, &storage_size,
1296                                                  &remaining_size, &max_size);
1297
1298                 if (status != EFI_SUCCESS)
1299                         return status;
1300
1301                 /*
1302                  * There still isn't enough room, so return an error
1303                  */
1304                 if (remaining_size - size < EFI_MIN_RESERVE)
1305                         return EFI_OUT_OF_RESOURCES;
1306         }
1307
1308         return EFI_SUCCESS;
1309 }
1310 EXPORT_SYMBOL_GPL(efi_query_variable_store);
1311
1312 static int __init parse_efi_cmdline(char *str)
1313 {
1314         if (*str == '=')
1315                 str++;
1316
1317         if (!strncmp(str, "old_map", 7))
1318                 set_bit(EFI_OLD_MEMMAP, &efi.flags);
1319
1320         return 0;
1321 }
1322 early_param("efi", parse_efi_cmdline);
1323
1324 void __init efi_apply_memmap_quirks(void)
1325 {
1326         /*
1327          * Once setup is done earlier, unmap the EFI memory map on mismatched
1328          * firmware/kernel architectures since there is no support for runtime
1329          * services.
1330          */
1331         if (!efi_runtime_supported()) {
1332                 pr_info("efi: Setup done, disabling due to 32/64-bit mismatch\n");
1333                 efi_unmap_memmap();
1334         }
1335
1336         /*
1337          * UV doesn't support the new EFI pagetable mapping yet.
1338          */
1339         if (is_uv_system())
1340                 set_bit(EFI_OLD_MEMMAP, &efi.flags);
1341 }