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  *
  16  * Copied from efi_32.c to eliminate the duplicated code between EFI
  17  * 32/64 support code. --ying 2007-10-26
  18  *
  19  * All EFI Runtime Services are not implemented yet as EFI only
  20  * supports physical mode addressing on SoftSDV. This is to be fixed
  21  * in a future version.  --drummond 1999-07-20
  22  *
  23  * Implemented EFI runtime services and virtual mode calls.  --davidm
  24  *
  25  * Goutham Rao: <goutham.rao@intel.com>
  26  *      Skip non-WB memory and ignore empty memory ranges.
  27  */
  28
  29 #include <linux/kernel.h>
  30 #include <linux/init.h>
  31 #include <linux/efi.h>
  32 #include <linux/bootmem.h>
  33 #include <linux/memblock.h>
  34 #include <linux/spinlock.h>
  35 #include <linux/uaccess.h>
  36 #include <linux/time.h>
  37 #include <linux/io.h>
  38 #include <linux/reboot.h>
  39 #include <linux/bcd.h>
  40
  41 #include <asm/setup.h>
  42 #include <asm/efi.h>
  43 #include <asm/time.h>
  44 #include <asm/cacheflush.h>
  45 #include <asm/tlbflush.h>
  46 #include <asm/x86_init.h>
  47
  48 #define EFI_DEBUG       1
  49 #define PFX             "EFI: "
  50
  51 int efi_enabled;
  52 EXPORT_SYMBOL(efi_enabled);
  53
  54 struct efi efi;
  55 EXPORT_SYMBOL(efi);
  56
  57 struct efi_memory_map memmap;
  58
  59 static struct efi efi_phys __initdata;
  60 static efi_system_table_t efi_systab __initdata;
  61
  62 static int __init setup_noefi(char *arg)
  63 {
  64         efi_enabled = 0;
  65         return 0;
  66 }
  67 early_param("noefi", setup_noefi);
  68
  69 int add_efi_memmap;
  70 EXPORT_SYMBOL(add_efi_memmap);
  71
  72 static int __init setup_add_efi_memmap(char *arg)
  73 {
  74         add_efi_memmap = 1;
  75         return 0;
  76 }
  77 early_param("add_efi_memmap", setup_add_efi_memmap);
  78
  79
  80 static efi_status_t virt_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
  81 {
  82         return efi_call_virt2(get_time, tm, tc);
  83 }
  84
  85 static efi_status_t virt_efi_set_time(efi_time_t *tm)
  86 {
  87         return efi_call_virt1(set_time, tm);
  88 }
  89
  90 static efi_status_t virt_efi_get_wakeup_time(efi_bool_t *enabled,
  91                                              efi_bool_t *pending,
  92                                              efi_time_t *tm)
  93 {
  94         return efi_call_virt3(get_wakeup_time,
  95                               enabled, pending, tm);
  96 }
  97
  98 static efi_status_t virt_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
  99 {
 100         return efi_call_virt2(set_wakeup_time,
 101                               enabled, tm);
 102 }
 103
 104 static efi_status_t virt_efi_get_variable(efi_char16_t *name,
 105                                           efi_guid_t *vendor,
 106                                           u32 *attr,
 107                                           unsigned long *data_size,
 108                                           void *data)
 109 {
 110         return efi_call_virt5(get_variable,
 111                               name, vendor, attr,
 112                               data_size, data);
 113 }
 114
 115 static efi_status_t virt_efi_get_next_variable(unsigned long *name_size,
 116                                                efi_char16_t *name,
 117                                                efi_guid_t *vendor)
 118 {
 119         return efi_call_virt3(get_next_variable,
 120                               name_size, name, vendor);
 121 }
 122
 123 static efi_status_t virt_efi_set_variable(efi_char16_t *name,
 124                                           efi_guid_t *vendor,
 125                                           u32 attr,
 126                                           unsigned long data_size,
 127                                           void *data)
 128 {
 129         return efi_call_virt5(set_variable,
 130                               name, vendor, attr,
 131                               data_size, data);
 132 }
 133
 134 static efi_status_t virt_efi_query_variable_info(u32 attr,
 135                                                  u64 *storage_space,
 136                                                  u64 *remaining_space,
 137                                                  u64 *max_variable_size)
 138 {
 139         if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
 140                 return EFI_UNSUPPORTED;
 141
 142         return efi_call_virt4(query_variable_info, attr, storage_space,
 143                               remaining_space, max_variable_size);
 144 }
 145
 146 static efi_status_t virt_efi_get_next_high_mono_count(u32 *count)
 147 {
 148         return efi_call_virt1(get_next_high_mono_count, count);
 149 }
 150
 151 static void virt_efi_reset_system(int reset_type,
 152                                   efi_status_t status,
 153                                   unsigned long data_size,
 154                                   efi_char16_t *data)
 155 {
 156         efi_call_virt4(reset_system, reset_type, status,
 157                        data_size, data);
 158 }
 159
 160 static efi_status_t virt_efi_update_capsule(efi_capsule_header_t **capsules,
 161                                             unsigned long count,
 162                                             unsigned long sg_list)
 163 {
 164         if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
 165                 return EFI_UNSUPPORTED;
 166
 167         return efi_call_virt3(update_capsule, capsules, count, sg_list);
 168 }
 169
 170 static efi_status_t virt_efi_query_capsule_caps(efi_capsule_header_t **capsules,
 171                                                 unsigned long count,
 172                                                 u64 *max_size,
 173                                                 int *reset_type)
 174 {
 175         if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
 176                 return EFI_UNSUPPORTED;
 177
 178         return efi_call_virt4(query_capsule_caps, capsules, count, max_size,
 179                               reset_type);
 180 }
 181
 182 static efi_status_t __init phys_efi_set_virtual_address_map(
 183         unsigned long memory_map_size,
 184         unsigned long descriptor_size,
 185         u32 descriptor_version,
 186         efi_memory_desc_t *virtual_map)
 187 {
 188         efi_status_t status;
 189
 190         efi_call_phys_prelog();
 191         status = efi_call_phys4(efi_phys.set_virtual_address_map,
 192                                 memory_map_size, descriptor_size,
 193                                 descriptor_version, virtual_map);
 194         efi_call_phys_epilog();
 195         return status;
 196 }
 197
 198 static efi_status_t __init phys_efi_get_time(efi_time_t *tm,
 199                                              efi_time_cap_t *tc)
 200 {
 201         efi_status_t status;
 202
 203         efi_call_phys_prelog();
 204         status = efi_call_phys2(efi_phys.get_time, tm, tc);
 205         efi_call_phys_epilog();
 206         return status;
 207 }
 208
 209 int efi_set_rtc_mmss(unsigned long nowtime)
 210 {
 211         int real_seconds, real_minutes;
 212         efi_status_t    status;
 213         efi_time_t      eft;
 214         efi_time_cap_t  cap;
 215
 216         status = efi.get_time(&eft, &cap);
 217         if (status != EFI_SUCCESS) {
 218                 printk(KERN_ERR "Oops: efitime: can't read time!\n");
 219                 return -1;
 220         }
 221
 222         real_seconds = nowtime % 60;
 223         real_minutes = nowtime / 60;
 224         if (((abs(real_minutes - eft.minute) + 15)/30) & 1)
 225                 real_minutes += 30;
 226         real_minutes %= 60;
 227         eft.minute = real_minutes;
 228         eft.second = real_seconds;
 229
 230         status = efi.set_time(&eft);
 231         if (status != EFI_SUCCESS) {
 232                 printk(KERN_ERR "Oops: efitime: can't write time!\n");
 233                 return -1;
 234         }
 235         return 0;
 236 }
 237
 238 unsigned long efi_get_time(void)
 239 {
 240         efi_status_t status;
 241         efi_time_t eft;
 242         efi_time_cap_t cap;
 243
 244         status = efi.get_time(&eft, &cap);
 245         if (status != EFI_SUCCESS)
 246                 printk(KERN_ERR "Oops: efitime: can't read time!\n");
 247
 248         return mktime(eft.year, eft.month, eft.day, eft.hour,
 249                       eft.minute, eft.second);
 250 }
 251
 252 /*
 253  * Tell the kernel about the EFI memory map.  This might include
 254  * more than the max 128 entries that can fit in the e820 legacy
 255  * (zeropage) memory map.
 256  */
 257
 258 static void __init do_add_efi_memmap(void)
 259 {
 260         void *p;
 261
 262         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 263                 efi_memory_desc_t *md = p;
 264                 unsigned long long start = md->phys_addr;
 265                 unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
 266                 int e820_type;
 267
 268                 switch (md->type) {
 269                 case EFI_LOADER_CODE:
 270                 case EFI_LOADER_DATA:
 271                 case EFI_BOOT_SERVICES_CODE:
 272                 case EFI_BOOT_SERVICES_DATA:
 273                 case EFI_CONVENTIONAL_MEMORY:
 274                         if (md->attribute & EFI_MEMORY_WB)
 275                                 e820_type = E820_RAM;
 276                         else
 277                                 e820_type = E820_RESERVED;
 278                         break;
 279                 case EFI_ACPI_RECLAIM_MEMORY:
 280                         e820_type = E820_ACPI;
 281                         break;
 282                 case EFI_ACPI_MEMORY_NVS:
 283                         e820_type = E820_NVS;
 284                         break;
 285                 case EFI_UNUSABLE_MEMORY:
 286                         e820_type = E820_UNUSABLE;
 287                         break;
 288                 default:
 289                         /*
 290                          * EFI_RESERVED_TYPE EFI_RUNTIME_SERVICES_CODE
 291                          * EFI_RUNTIME_SERVICES_DATA EFI_MEMORY_MAPPED_IO
 292                          * EFI_MEMORY_MAPPED_IO_PORT_SPACE EFI_PAL_CODE
 293                          */
 294                         e820_type = E820_RESERVED;
 295                         break;
 296                 }
 297                 e820_add_region(start, size, e820_type);
 298         }
 299         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 300 }
 301
 302 void __init efi_memblock_x86_reserve_range(void)
 303 {
 304         unsigned long pmap;
 305
 306 #ifdef CONFIG_X86_32
 307         pmap = boot_params.efi_info.efi_memmap;
 308 #else
 309         pmap = (boot_params.efi_info.efi_memmap |
 310                 ((__u64)boot_params.efi_info.efi_memmap_hi<<32));
 311 #endif
 312         memmap.phys_map = (void *)pmap;
 313         memmap.nr_map = boot_params.efi_info.efi_memmap_size /
 314                 boot_params.efi_info.efi_memdesc_size;
 315         memmap.desc_version = boot_params.efi_info.efi_memdesc_version;
 316         memmap.desc_size = boot_params.efi_info.efi_memdesc_size;
 317         memblock_x86_reserve_range(pmap, pmap + memmap.nr_map * memmap.desc_size,
 318                       "EFI memmap");
 319 }
 320
 321 #if EFI_DEBUG
 322 static void __init print_efi_memmap(void)
 323 {
 324         efi_memory_desc_t *md;
 325         void *p;
 326         int i;
 327
 328         for (p = memmap.map, i = 0;
 329              p < memmap.map_end;
 330              p += memmap.desc_size, i++) {
 331                 md = p;
 332                 printk(KERN_INFO PFX "mem%02u: type=%u, attr=0x%llx, "
 333                         "range=[0x%016llx-0x%016llx) (%lluMB)\n",
 334                         i, md->type, md->attribute, md->phys_addr,
 335                         md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
 336                         (md->num_pages >> (20 - EFI_PAGE_SHIFT)));
 337         }
 338 }
 339 #endif  /*  EFI_DEBUG  */
 340
 341 void __init efi_reserve_boot_services(void)
 342 {
 343         void *p;
 344
 345         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 346                 efi_memory_desc_t *md = p;
 347                 unsigned long long start = md->phys_addr;
 348                 unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
 349
 350                 if (md->type != EFI_BOOT_SERVICES_CODE &&
 351                     md->type != EFI_BOOT_SERVICES_DATA)
 352                         continue;
 353
 354                 memblock_x86_reserve_range(start, start + size, "EFI Boot");
 355         }
 356 }
 357
 358 static void __init efi_free_boot_services(void)
 359 {
 360         void *p;
 361
 362         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 363                 efi_memory_desc_t *md = p;
 364                 unsigned long long start = md->phys_addr;
 365                 unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
 366
 367                 if (md->type != EFI_BOOT_SERVICES_CODE &&
 368                     md->type != EFI_BOOT_SERVICES_DATA)
 369                         continue;
 370
 371                 free_bootmem_late(start, size);
 372         }
 373 }
 374
 375 void __init efi_init(void)
 376 {
 377         efi_config_table_t *config_tables;
 378         efi_runtime_services_t *runtime;
 379         efi_char16_t *c16;
 380         char vendor[100] = "unknown";
 381         int i = 0;
 382         void *tmp;
 383
 384 #ifdef CONFIG_X86_32
 385         efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab;
 386 #else
 387         efi_phys.systab = (efi_system_table_t *)
 388                 (boot_params.efi_info.efi_systab |
 389                  ((__u64)boot_params.efi_info.efi_systab_hi<<32));
 390 #endif
 391
 392         efi.systab = early_ioremap((unsigned long)efi_phys.systab,
 393                                    sizeof(efi_system_table_t));
 394         if (efi.systab == NULL)
 395                 printk(KERN_ERR "Couldn't map the EFI system table!\n");
 396         memcpy(&efi_systab, efi.systab, sizeof(efi_system_table_t));
 397         early_iounmap(efi.systab, sizeof(efi_system_table_t));
 398         efi.systab = &efi_systab;
 399
 400         /*
 401          * Verify the EFI Table
 402          */
 403         if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
 404                 printk(KERN_ERR "EFI system table signature incorrect!\n");
 405         if ((efi.systab->hdr.revision >> 16) == 0)
 406                 printk(KERN_ERR "Warning: EFI system table version "
 407                        "%d.%02d, expected 1.00 or greater!\n",
 408                        efi.systab->hdr.revision >> 16,
 409                        efi.systab->hdr.revision & 0xffff);
 410
 411         /*
 412          * Show what we know for posterity
 413          */
 414         c16 = tmp = early_ioremap(efi.systab->fw_vendor, 2);
 415         if (c16) {
 416                 for (i = 0; i < sizeof(vendor) - 1 && *c16; ++i)
 417                         vendor[i] = *c16++;
 418                 vendor[i] = '\0';
 419         } else
 420                 printk(KERN_ERR PFX "Could not map the firmware vendor!\n");
 421         early_iounmap(tmp, 2);
 422
 423         printk(KERN_INFO "EFI v%u.%.02u by %s\n",
 424                efi.systab->hdr.revision >> 16,
 425                efi.systab->hdr.revision & 0xffff, vendor);
 426
 427         /*
 428          * Let's see what config tables the firmware passed to us.
 429          */
 430         config_tables = early_ioremap(
 431                 efi.systab->tables,
 432                 efi.systab->nr_tables * sizeof(efi_config_table_t));
 433         if (config_tables == NULL)
 434                 printk(KERN_ERR "Could not map EFI Configuration Table!\n");
 435
 436         printk(KERN_INFO);
 437         for (i = 0; i < efi.systab->nr_tables; i++) {
 438                 if (!efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID)) {
 439                         efi.mps = config_tables[i].table;
 440                         printk(" MPS=0x%lx ", config_tables[i].table);
 441                 } else if (!efi_guidcmp(config_tables[i].guid,
 442                                         ACPI_20_TABLE_GUID)) {
 443                         efi.acpi20 = config_tables[i].table;
 444                         printk(" ACPI 2.0=0x%lx ", config_tables[i].table);
 445                 } else if (!efi_guidcmp(config_tables[i].guid,
 446                                         ACPI_TABLE_GUID)) {
 447                         efi.acpi = config_tables[i].table;
 448                         printk(" ACPI=0x%lx ", config_tables[i].table);
 449                 } else if (!efi_guidcmp(config_tables[i].guid,
 450                                         SMBIOS_TABLE_GUID)) {
 451                         efi.smbios = config_tables[i].table;
 452                         printk(" SMBIOS=0x%lx ", config_tables[i].table);
 453 #ifdef CONFIG_X86_UV
 454                 } else if (!efi_guidcmp(config_tables[i].guid,
 455                                         UV_SYSTEM_TABLE_GUID)) {
 456                         efi.uv_systab = config_tables[i].table;
 457                         printk(" UVsystab=0x%lx ", config_tables[i].table);
 458 #endif
 459                 } else if (!efi_guidcmp(config_tables[i].guid,
 460                                         HCDP_TABLE_GUID)) {
 461                         efi.hcdp = config_tables[i].table;
 462                         printk(" HCDP=0x%lx ", config_tables[i].table);
 463                 } else if (!efi_guidcmp(config_tables[i].guid,
 464                                         UGA_IO_PROTOCOL_GUID)) {
 465                         efi.uga = config_tables[i].table;
 466                         printk(" UGA=0x%lx ", config_tables[i].table);
 467                 }
 468         }
 469         printk("\n");
 470         early_iounmap(config_tables,
 471                           efi.systab->nr_tables * sizeof(efi_config_table_t));
 472
 473         /*
 474          * Check out the runtime services table. We need to map
 475          * the runtime services table so that we can grab the physical
 476          * address of several of the EFI runtime functions, needed to
 477          * set the firmware into virtual mode.
 478          */
 479         runtime = early_ioremap((unsigned long)efi.systab->runtime,
 480                                 sizeof(efi_runtime_services_t));
 481         if (runtime != NULL) {
 482                 /*
 483                  * We will only need *early* access to the following
 484                  * two EFI runtime services before set_virtual_address_map
 485                  * is invoked.
 486                  */
 487                 efi_phys.get_time = (efi_get_time_t *)runtime->get_time;
 488                 efi_phys.set_virtual_address_map =
 489                         (efi_set_virtual_address_map_t *)
 490                         runtime->set_virtual_address_map;
 491                 /*
 492                  * Make efi_get_time can be called before entering
 493                  * virtual mode.
 494                  */
 495                 efi.get_time = phys_efi_get_time;
 496         } else
 497                 printk(KERN_ERR "Could not map the EFI runtime service "
 498                        "table!\n");
 499         early_iounmap(runtime, sizeof(efi_runtime_services_t));
 500
 501         /* Map the EFI memory map */
 502         memmap.map = early_ioremap((unsigned long)memmap.phys_map,
 503                                    memmap.nr_map * memmap.desc_size);
 504         if (memmap.map == NULL)
 505                 printk(KERN_ERR "Could not map the EFI memory map!\n");
 506         memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
 507
 508         if (memmap.desc_size != sizeof(efi_memory_desc_t))
 509                 printk(KERN_WARNING
 510                   "Kernel-defined memdesc doesn't match the one from EFI!\n");
 511
 512         if (add_efi_memmap)
 513                 do_add_efi_memmap();
 514
 515 #ifdef CONFIG_X86_32
 516         x86_platform.get_wallclock = efi_get_time;
 517         x86_platform.set_wallclock = efi_set_rtc_mmss;
 518 #endif
 519
 520         /* Setup for EFI runtime service */
 521         reboot_type = BOOT_EFI;
 522
 523 #if EFI_DEBUG
 524         print_efi_memmap();
 525 #endif
 526 }
 527
 528 void __init efi_set_executable(efi_memory_desc_t *md, bool executable)
 529 {
 530         u64 addr, npages;
 531
 532         addr = md->virt_addr;
 533         npages = md->num_pages;
 534
 535         memrange_efi_to_native(&addr, &npages);
 536
 537         if (executable)
 538                 set_memory_x(addr, npages);
 539         else
 540                 set_memory_nx(addr, npages);
 541 }
 542
 543 static void __init runtime_code_page_mkexec(void)
 544 {
 545         efi_memory_desc_t *md;
 546         void *p;
 547
 548         /* Make EFI runtime service code area executable */
 549         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 550                 md = p;
 551
 552                 if (md->type != EFI_RUNTIME_SERVICES_CODE)
 553                         continue;
 554
 555                 efi_set_executable(md, true);
 556         }
 557 }
 558
 559 /*
 560  * This function will switch the EFI runtime services to virtual mode.
 561  * Essentially, look through the EFI memmap and map every region that
 562  * has the runtime attribute bit set in its memory descriptor and update
 563  * that memory descriptor with the virtual address obtained from ioremap().
 564  * This enables the runtime services to be called without having to
 565  * thunk back into physical mode for every invocation.
 566  */
 567 void __init efi_enter_virtual_mode(void)
 568 {
 569         efi_memory_desc_t *md, *prev_md = NULL;
 570         efi_status_t status;
 571         unsigned long size;
 572         u64 end, systab, addr, npages, end_pfn;
 573         void *p, *va, *new_memmap = NULL;
 574         int count = 0;
 575
 576         efi.systab = NULL;
 577
 578         /* Merge contiguous regions of the same type and attribute */
 579         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 580                 u64 prev_size;
 581                 md = p;
 582
 583                 if (!prev_md) {
 584                         prev_md = md;
 585                         continue;
 586                 }
 587
 588                 if (prev_md->type != md->type ||
 589                     prev_md->attribute != md->attribute) {
 590                         prev_md = md;
 591                         continue;
 592                 }
 593
 594                 prev_size = prev_md->num_pages << EFI_PAGE_SHIFT;
 595
 596                 if (md->phys_addr == (prev_md->phys_addr + prev_size)) {
 597                         prev_md->num_pages += md->num_pages;
 598                         md->type = EFI_RESERVED_TYPE;
 599                         md->attribute = 0;
 600                         continue;
 601                 }
 602                 prev_md = md;
 603         }
 604
 605         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 606                 md = p;
 607                 if (!(md->attribute & EFI_MEMORY_RUNTIME) &&
 608                     md->type != EFI_BOOT_SERVICES_CODE &&
 609                     md->type != EFI_BOOT_SERVICES_DATA)
 610                         continue;
 611
 612                 size = md->num_pages << EFI_PAGE_SHIFT;
 613                 end = md->phys_addr + size;
 614
 615                 end_pfn = PFN_UP(end);
 616                 if (end_pfn <= max_low_pfn_mapped
 617                     || (end_pfn > (1UL << (32 - PAGE_SHIFT))
 618                         && end_pfn <= max_pfn_mapped))
 619                         va = __va(md->phys_addr);
 620                 else
 621                         va = efi_ioremap(md->phys_addr, size, md->type);
 622
 623                 md->virt_addr = (u64) (unsigned long) va;
 624
 625                 if (!va) {
 626                         printk(KERN_ERR PFX "ioremap of 0x%llX failed!\n",
 627                                (unsigned long long)md->phys_addr);
 628                         continue;
 629                 }
 630
 631                 if (!(md->attribute & EFI_MEMORY_WB)) {
 632                         addr = md->virt_addr;
 633                         npages = md->num_pages;
 634                         memrange_efi_to_native(&addr, &npages);
 635                         set_memory_uc(addr, npages);
 636                 }
 637
 638                 systab = (u64) (unsigned long) efi_phys.systab;
 639                 if (md->phys_addr <= systab && systab < end) {
 640                         systab += md->virt_addr - md->phys_addr;
 641                         efi.systab = (efi_system_table_t *) (unsigned long) systab;
 642                 }
 643                 new_memmap = krealloc(new_memmap,
 644                                       (count + 1) * memmap.desc_size,
 645                                       GFP_KERNEL);
 646                 memcpy(new_memmap + (count * memmap.desc_size), md,
 647                        memmap.desc_size);
 648                 count++;
 649         }
 650
 651         BUG_ON(!efi.systab);
 652
 653         status = phys_efi_set_virtual_address_map(
 654                 memmap.desc_size * count,
 655                 memmap.desc_size,
 656                 memmap.desc_version,
 657                 (efi_memory_desc_t *)__pa(new_memmap));
 658
 659         if (status != EFI_SUCCESS) {
 660                 printk(KERN_ALERT "Unable to switch EFI into virtual mode "
 661                        "(status=%lx)!\n", status);
 662                 panic("EFI call to SetVirtualAddressMap() failed!");
 663         }
 664
 665         /*
 666          * Thankfully, it does seem that no runtime services other than
 667          * SetVirtualAddressMap() will touch boot services code, so we can
 668          * get rid of it all at this point
 669          */
 670         efi_free_boot_services();
 671
 672         /*
 673          * Now that EFI is in virtual mode, update the function
 674          * pointers in the runtime service table to the new virtual addresses.
 675          *
 676          * Call EFI services through wrapper functions.
 677          */
 678         efi.get_time = virt_efi_get_time;
 679         efi.set_time = virt_efi_set_time;
 680         efi.get_wakeup_time = virt_efi_get_wakeup_time;
 681         efi.set_wakeup_time = virt_efi_set_wakeup_time;
 682         efi.get_variable = virt_efi_get_variable;
 683         efi.get_next_variable = virt_efi_get_next_variable;
 684         efi.set_variable = virt_efi_set_variable;
 685         efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count;
 686         efi.reset_system = virt_efi_reset_system;
 687         efi.set_virtual_address_map = NULL;
 688         efi.query_variable_info = virt_efi_query_variable_info;
 689         efi.update_capsule = virt_efi_update_capsule;
 690         efi.query_capsule_caps = virt_efi_query_capsule_caps;
 691         if (__supported_pte_mask & _PAGE_NX)
 692                 runtime_code_page_mkexec();
 693         early_iounmap(memmap.map, memmap.nr_map * memmap.desc_size);
 694         memmap.map = NULL;
 695         kfree(new_memmap);
 696 }
 697
 698 /*
 699  * Convenience functions to obtain memory types and attributes
 700  */
 701 u32 efi_mem_type(unsigned long phys_addr)
 702 {
 703         efi_memory_desc_t *md;
 704         void *p;
 705
 706         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 707                 md = p;
 708                 if ((md->phys_addr <= phys_addr) &&
 709                     (phys_addr < (md->phys_addr +
 710                                   (md->num_pages << EFI_PAGE_SHIFT))))
 711                         return md->type;
 712         }
 713         return 0;
 714 }
 715
 716 u64 efi_mem_attributes(unsigned long phys_addr)
 717 {
 718         efi_memory_desc_t *md;
 719         void *p;
 720
 721         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 722                 md = p;
 723                 if ((md->phys_addr <= phys_addr) &&
 724                     (phys_addr < (md->phys_addr +
 725                                   (md->num_pages << EFI_PAGE_SHIFT))))
 726                         return md->attribute;
 727         }
 728         return 0;
 729 }