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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  30
  31 #include <linux/kernel.h>
  32 #include <linux/init.h>
  33 #include <linux/efi.h>
  34 #include <linux/export.h>
  35 #include <linux/bootmem.h>
  36 #include <linux/memblock.h>
  37 #include <linux/spinlock.h>
  38 #include <linux/uaccess.h>
  39 #include <linux/time.h>
  40 #include <linux/io.h>
  41 #include <linux/reboot.h>
  42 #include <linux/bcd.h>
  43
  44 #include <asm/setup.h>
  45 #include <asm/efi.h>
  46 #include <asm/time.h>
  47 #include <asm/cacheflush.h>
  48 #include <asm/tlbflush.h>
  49 #include <asm/x86_init.h>
  50
  51 #define EFI_DEBUG       1
  52
  53 int efi_enabled;
  54 EXPORT_SYMBOL(efi_enabled);
  55
  56 struct efi __read_mostly efi = {
  57         .mps        = EFI_INVALID_TABLE_ADDR,
  58         .acpi       = EFI_INVALID_TABLE_ADDR,
  59         .acpi20     = EFI_INVALID_TABLE_ADDR,
  60         .smbios     = EFI_INVALID_TABLE_ADDR,
  61         .sal_systab = EFI_INVALID_TABLE_ADDR,
  62         .boot_info  = EFI_INVALID_TABLE_ADDR,
  63         .hcdp       = EFI_INVALID_TABLE_ADDR,
  64         .uga        = EFI_INVALID_TABLE_ADDR,
  65         .uv_systab  = EFI_INVALID_TABLE_ADDR,
  66 };
  67 EXPORT_SYMBOL(efi);
  68
  69 struct efi_memory_map memmap;
  70
  71 bool efi_64bit;
  72 static bool efi_native;
  73
  74 static struct efi efi_phys __initdata;
  75 static efi_system_table_t efi_systab __initdata;
  76
  77 static int __init setup_noefi(char *arg)
  78 {
  79         efi_enabled = 0;
  80         return 0;
  81 }
  82 early_param("noefi", setup_noefi);
  83
  84 int add_efi_memmap;
  85 EXPORT_SYMBOL(add_efi_memmap);
  86
  87 static int __init setup_add_efi_memmap(char *arg)
  88 {
  89         add_efi_memmap = 1;
  90         return 0;
  91 }
  92 early_param("add_efi_memmap", setup_add_efi_memmap);
  93
  94
  95 static efi_status_t virt_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
  96 {
  97         unsigned long flags;
  98         efi_status_t status;
  99
 100         spin_lock_irqsave(&rtc_lock, flags);
 101         status = efi_call_virt2(get_time, tm, tc);
 102         spin_unlock_irqrestore(&rtc_lock, flags);
 103         return status;
 104 }
 105
 106 static efi_status_t virt_efi_set_time(efi_time_t *tm)
 107 {
 108         unsigned long flags;
 109         efi_status_t status;
 110
 111         spin_lock_irqsave(&rtc_lock, flags);
 112         status = efi_call_virt1(set_time, tm);
 113         spin_unlock_irqrestore(&rtc_lock, flags);
 114         return status;
 115 }
 116
 117 static efi_status_t virt_efi_get_wakeup_time(efi_bool_t *enabled,
 118                                              efi_bool_t *pending,
 119                                              efi_time_t *tm)
 120 {
 121         unsigned long flags;
 122         efi_status_t status;
 123
 124         spin_lock_irqsave(&rtc_lock, flags);
 125         status = efi_call_virt3(get_wakeup_time,
 126                                 enabled, pending, tm);
 127         spin_unlock_irqrestore(&rtc_lock, flags);
 128         return status;
 129 }
 130
 131 static efi_status_t virt_efi_set_wakeup_time(efi_bool_t enabled, 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_virt2(set_wakeup_time,
 138                                 enabled, tm);
 139         spin_unlock_irqrestore(&rtc_lock, flags);
 140         return status;
 141 }
 142
 143 static efi_status_t virt_efi_get_variable(efi_char16_t *name,
 144                                           efi_guid_t *vendor,
 145                                           u32 *attr,
 146                                           unsigned long *data_size,
 147                                           void *data)
 148 {
 149         return efi_call_virt5(get_variable,
 150                               name, vendor, attr,
 151                               data_size, data);
 152 }
 153
 154 static efi_status_t virt_efi_get_next_variable(unsigned long *name_size,
 155                                                efi_char16_t *name,
 156                                                efi_guid_t *vendor)
 157 {
 158         return efi_call_virt3(get_next_variable,
 159                               name_size, name, vendor);
 160 }
 161
 162 static efi_status_t virt_efi_set_variable(efi_char16_t *name,
 163                                           efi_guid_t *vendor,
 164                                           u32 attr,
 165                                           unsigned long data_size,
 166                                           void *data)
 167 {
 168         return efi_call_virt5(set_variable,
 169                               name, vendor, attr,
 170                               data_size, data);
 171 }
 172
 173 static efi_status_t virt_efi_query_variable_info(u32 attr,
 174                                                  u64 *storage_space,
 175                                                  u64 *remaining_space,
 176                                                  u64 *max_variable_size)
 177 {
 178         if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
 179                 return EFI_UNSUPPORTED;
 180
 181         return efi_call_virt4(query_variable_info, attr, storage_space,
 182                               remaining_space, max_variable_size);
 183 }
 184
 185 static efi_status_t virt_efi_get_next_high_mono_count(u32 *count)
 186 {
 187         return efi_call_virt1(get_next_high_mono_count, count);
 188 }
 189
 190 static void virt_efi_reset_system(int reset_type,
 191                                   efi_status_t status,
 192                                   unsigned long data_size,
 193                                   efi_char16_t *data)
 194 {
 195         efi_call_virt4(reset_system, reset_type, status,
 196                        data_size, data);
 197 }
 198
 199 static efi_status_t virt_efi_update_capsule(efi_capsule_header_t **capsules,
 200                                             unsigned long count,
 201                                             unsigned long sg_list)
 202 {
 203         if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
 204                 return EFI_UNSUPPORTED;
 205
 206         return efi_call_virt3(update_capsule, capsules, count, sg_list);
 207 }
 208
 209 static efi_status_t virt_efi_query_capsule_caps(efi_capsule_header_t **capsules,
 210                                                 unsigned long count,
 211                                                 u64 *max_size,
 212                                                 int *reset_type)
 213 {
 214         if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
 215                 return EFI_UNSUPPORTED;
 216
 217         return efi_call_virt4(query_capsule_caps, capsules, count, max_size,
 218                               reset_type);
 219 }
 220
 221 static efi_status_t __init phys_efi_set_virtual_address_map(
 222         unsigned long memory_map_size,
 223         unsigned long descriptor_size,
 224         u32 descriptor_version,
 225         efi_memory_desc_t *virtual_map)
 226 {
 227         efi_status_t status;
 228
 229         efi_call_phys_prelog();
 230         status = efi_call_phys4(efi_phys.set_virtual_address_map,
 231                                 memory_map_size, descriptor_size,
 232                                 descriptor_version, virtual_map);
 233         efi_call_phys_epilog();
 234         return status;
 235 }
 236
 237 static int efi_set_rtc_mmss(unsigned long nowtime)
 238 {
 239         int real_seconds, real_minutes;
 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                 pr_err("Oops: efitime: can't read time!\n");
 247                 return -1;
 248         }
 249
 250         real_seconds = nowtime % 60;
 251         real_minutes = nowtime / 60;
 252         if (((abs(real_minutes - eft.minute) + 15)/30) & 1)
 253                 real_minutes += 30;
 254         real_minutes %= 60;
 255         eft.minute = real_minutes;
 256         eft.second = real_seconds;
 257
 258         status = efi.set_time(&eft);
 259         if (status != EFI_SUCCESS) {
 260                 pr_err("Oops: efitime: can't write time!\n");
 261                 return -1;
 262         }
 263         return 0;
 264 }
 265
 266 static unsigned long efi_get_time(void)
 267 {
 268         efi_status_t status;
 269         efi_time_t eft;
 270         efi_time_cap_t cap;
 271
 272         status = efi.get_time(&eft, &cap);
 273         if (status != EFI_SUCCESS)
 274                 pr_err("Oops: efitime: can't read time!\n");
 275
 276         return mktime(eft.year, eft.month, eft.day, eft.hour,
 277                       eft.minute, eft.second);
 278 }
 279
 280 /*
 281  * Tell the kernel about the EFI memory map.  This might include
 282  * more than the max 128 entries that can fit in the e820 legacy
 283  * (zeropage) memory map.
 284  */
 285
 286 static void __init do_add_efi_memmap(void)
 287 {
 288         void *p;
 289
 290         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 291                 efi_memory_desc_t *md = p;
 292                 unsigned long long start = md->phys_addr;
 293                 unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
 294                 int e820_type;
 295
 296                 switch (md->type) {
 297                 case EFI_LOADER_CODE:
 298                 case EFI_LOADER_DATA:
 299                 case EFI_BOOT_SERVICES_CODE:
 300                 case EFI_BOOT_SERVICES_DATA:
 301                 case EFI_CONVENTIONAL_MEMORY:
 302                         if (md->attribute & EFI_MEMORY_WB)
 303                                 e820_type = E820_RAM;
 304                         else
 305                                 e820_type = E820_RESERVED;
 306                         break;
 307                 case EFI_ACPI_RECLAIM_MEMORY:
 308                         e820_type = E820_ACPI;
 309                         break;
 310                 case EFI_ACPI_MEMORY_NVS:
 311                         e820_type = E820_NVS;
 312                         break;
 313                 case EFI_UNUSABLE_MEMORY:
 314                         e820_type = E820_UNUSABLE;
 315                         break;
 316                 default:
 317                         /*
 318                          * EFI_RESERVED_TYPE EFI_RUNTIME_SERVICES_CODE
 319                          * EFI_RUNTIME_SERVICES_DATA EFI_MEMORY_MAPPED_IO
 320                          * EFI_MEMORY_MAPPED_IO_PORT_SPACE EFI_PAL_CODE
 321                          */
 322                         e820_type = E820_RESERVED;
 323                         break;
 324                 }
 325                 e820_add_region(start, size, e820_type);
 326         }
 327         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 328 }
 329
 330 int __init efi_memblock_x86_reserve_range(void)
 331 {
 332         unsigned long pmap;
 333
 334 #ifdef CONFIG_X86_32
 335         /* Can't handle data above 4GB at this time */
 336         if (boot_params.efi_info.efi_memmap_hi) {
 337                 pr_err("Memory map is above 4GB, disabling EFI.\n");
 338                 return -EINVAL;
 339         }
 340         pmap = boot_params.efi_info.efi_memmap;
 341 #else
 342         pmap = (boot_params.efi_info.efi_memmap |
 343                 ((__u64)boot_params.efi_info.efi_memmap_hi<<32));
 344 #endif
 345         memmap.phys_map = (void *)pmap;
 346         memmap.nr_map = boot_params.efi_info.efi_memmap_size /
 347                 boot_params.efi_info.efi_memdesc_size;
 348         memmap.desc_version = boot_params.efi_info.efi_memdesc_version;
 349         memmap.desc_size = boot_params.efi_info.efi_memdesc_size;
 350         memblock_reserve(pmap, memmap.nr_map * memmap.desc_size);
 351
 352         return 0;
 353 }
 354
 355 #if EFI_DEBUG
 356 static void __init print_efi_memmap(void)
 357 {
 358         efi_memory_desc_t *md;
 359         void *p;
 360         int i;
 361
 362         for (p = memmap.map, i = 0;
 363              p < memmap.map_end;
 364              p += memmap.desc_size, i++) {
 365                 md = p;
 366                 pr_info("mem%02u: type=%u, attr=0x%llx, "
 367                         "range=[0x%016llx-0x%016llx) (%lluMB)\n",
 368                         i, md->type, md->attribute, md->phys_addr,
 369                         md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
 370                         (md->num_pages >> (20 - EFI_PAGE_SHIFT)));
 371         }
 372 }
 373 #endif  /*  EFI_DEBUG  */
 374
 375 void __init efi_reserve_boot_services(void)
 376 {
 377         void *p;
 378
 379         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 380                 efi_memory_desc_t *md = p;
 381                 u64 start = md->phys_addr;
 382                 u64 size = md->num_pages << EFI_PAGE_SHIFT;
 383
 384                 if (md->type != EFI_BOOT_SERVICES_CODE &&
 385                     md->type != EFI_BOOT_SERVICES_DATA)
 386                         continue;
 387                 /* Only reserve where possible:
 388                  * - Not within any already allocated areas
 389                  * - Not over any memory area (really needed, if above?)
 390                  * - Not within any part of the kernel
 391                  * - Not the bios reserved area
 392                 */
 393                 if ((start+size >= virt_to_phys(_text)
 394                                 && start <= virt_to_phys(_end)) ||
 395                         !e820_all_mapped(start, start+size, E820_RAM) ||
 396                         memblock_is_region_reserved(start, size)) {
 397                         /* Could not reserve, skip it */
 398                         md->num_pages = 0;
 399                         memblock_dbg("Could not reserve boot range "
 400                                         "[0x%010llx-0x%010llx]\n",
 401                                                 start, start+size-1);
 402                 } else
 403                         memblock_reserve(start, size);
 404         }
 405 }
 406
 407 static void __init efi_free_boot_services(void)
 408 {
 409         void *p;
 410
 411         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 412                 efi_memory_desc_t *md = p;
 413                 unsigned long long start = md->phys_addr;
 414                 unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
 415
 416                 if (md->type != EFI_BOOT_SERVICES_CODE &&
 417                     md->type != EFI_BOOT_SERVICES_DATA)
 418                         continue;
 419
 420                 /* Could not reserve boot area */
 421                 if (!size)
 422                         continue;
 423
 424                 free_bootmem_late(start, size);
 425         }
 426 }
 427
 428 static int __init efi_systab_init(void *phys)
 429 {
 430         if (efi_64bit) {
 431                 efi_system_table_64_t *systab64;
 432                 u64 tmp = 0;
 433
 434                 systab64 = early_ioremap((unsigned long)phys,
 435                                          sizeof(*systab64));
 436                 if (systab64 == NULL) {
 437                         pr_err("Couldn't map the system table!\n");
 438                         return -ENOMEM;
 439                 }
 440
 441                 efi_systab.hdr = systab64->hdr;
 442                 efi_systab.fw_vendor = systab64->fw_vendor;
 443                 tmp |= systab64->fw_vendor;
 444                 efi_systab.fw_revision = systab64->fw_revision;
 445                 efi_systab.con_in_handle = systab64->con_in_handle;
 446                 tmp |= systab64->con_in_handle;
 447                 efi_systab.con_in = systab64->con_in;
 448                 tmp |= systab64->con_in;
 449                 efi_systab.con_out_handle = systab64->con_out_handle;
 450                 tmp |= systab64->con_out_handle;
 451                 efi_systab.con_out = systab64->con_out;
 452                 tmp |= systab64->con_out;
 453                 efi_systab.stderr_handle = systab64->stderr_handle;
 454                 tmp |= systab64->stderr_handle;
 455                 efi_systab.stderr = systab64->stderr;
 456                 tmp |= systab64->stderr;
 457                 efi_systab.runtime = (void *)(unsigned long)systab64->runtime;
 458                 tmp |= systab64->runtime;
 459                 efi_systab.boottime = (void *)(unsigned long)systab64->boottime;
 460                 tmp |= systab64->boottime;
 461                 efi_systab.nr_tables = systab64->nr_tables;
 462                 efi_systab.tables = systab64->tables;
 463                 tmp |= systab64->tables;
 464
 465                 early_iounmap(systab64, sizeof(*systab64));
 466 #ifdef CONFIG_X86_32
 467                 if (tmp >> 32) {
 468                         pr_err("EFI data located above 4GB, disabling EFI.\n");
 469                         return -EINVAL;
 470                 }
 471 #endif
 472         } else {
 473                 efi_system_table_32_t *systab32;
 474
 475                 systab32 = early_ioremap((unsigned long)phys,
 476                                          sizeof(*systab32));
 477                 if (systab32 == NULL) {
 478                         pr_err("Couldn't map the system table!\n");
 479                         return -ENOMEM;
 480                 }
 481
 482                 efi_systab.hdr = systab32->hdr;
 483                 efi_systab.fw_vendor = systab32->fw_vendor;
 484                 efi_systab.fw_revision = systab32->fw_revision;
 485                 efi_systab.con_in_handle = systab32->con_in_handle;
 486                 efi_systab.con_in = systab32->con_in;
 487                 efi_systab.con_out_handle = systab32->con_out_handle;
 488                 efi_systab.con_out = systab32->con_out;
 489                 efi_systab.stderr_handle = systab32->stderr_handle;
 490                 efi_systab.stderr = systab32->stderr;
 491                 efi_systab.runtime = (void *)(unsigned long)systab32->runtime;
 492                 efi_systab.boottime = (void *)(unsigned long)systab32->boottime;
 493                 efi_systab.nr_tables = systab32->nr_tables;
 494                 efi_systab.tables = systab32->tables;
 495
 496                 early_iounmap(systab32, sizeof(*systab32));
 497         }
 498
 499         efi.systab = &efi_systab;
 500
 501         /*
 502          * Verify the EFI Table
 503          */
 504         if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) {
 505                 pr_err("System table signature incorrect!\n");
 506                 return -EINVAL;
 507         }
 508         if ((efi.systab->hdr.revision >> 16) == 0)
 509                 pr_err("Warning: System table version "
 510                        "%d.%02d, expected 1.00 or greater!\n",
 511                        efi.systab->hdr.revision >> 16,
 512                        efi.systab->hdr.revision & 0xffff);
 513
 514         return 0;
 515 }
 516
 517 static int __init efi_config_init(u64 tables, int nr_tables)
 518 {
 519         void *config_tables, *tablep;
 520         int i, sz;
 521
 522         if (efi_64bit)
 523                 sz = sizeof(efi_config_table_64_t);
 524         else
 525                 sz = sizeof(efi_config_table_32_t);
 526
 527         /*
 528          * Let's see what config tables the firmware passed to us.
 529          */
 530         config_tables = early_ioremap(tables, nr_tables * sz);
 531         if (config_tables == NULL) {
 532                 pr_err("Could not map Configuration table!\n");
 533                 return -ENOMEM;
 534         }
 535
 536         tablep = config_tables;
 537         pr_info("");
 538         for (i = 0; i < efi.systab->nr_tables; i++) {
 539                 efi_guid_t guid;
 540                 unsigned long table;
 541
 542                 if (efi_64bit) {
 543                         u64 table64;
 544                         guid = ((efi_config_table_64_t *)tablep)->guid;
 545                         table64 = ((efi_config_table_64_t *)tablep)->table;
 546                         table = table64;
 547 #ifdef CONFIG_X86_32
 548                         if (table64 >> 32) {
 549                                 pr_cont("\n");
 550                                 pr_err("Table located above 4GB, disabling EFI.\n");
 551                                 early_iounmap(config_tables,
 552                                               efi.systab->nr_tables * sz);
 553                                 return -EINVAL;
 554                         }
 555 #endif
 556                 } else {
 557                         guid = ((efi_config_table_32_t *)tablep)->guid;
 558                         table = ((efi_config_table_32_t *)tablep)->table;
 559                 }
 560                 if (!efi_guidcmp(guid, MPS_TABLE_GUID)) {
 561                         efi.mps = table;
 562                         pr_cont(" MPS=0x%lx ", table);
 563                 } else if (!efi_guidcmp(guid, ACPI_20_TABLE_GUID)) {
 564                         efi.acpi20 = table;
 565                         pr_cont(" ACPI 2.0=0x%lx ", table);
 566                 } else if (!efi_guidcmp(guid, ACPI_TABLE_GUID)) {
 567                         efi.acpi = table;
 568                         pr_cont(" ACPI=0x%lx ", table);
 569                 } else if (!efi_guidcmp(guid, SMBIOS_TABLE_GUID)) {
 570                         efi.smbios = table;
 571                         pr_cont(" SMBIOS=0x%lx ", table);
 572 #ifdef CONFIG_X86_UV
 573                 } else if (!efi_guidcmp(guid, UV_SYSTEM_TABLE_GUID)) {
 574                         efi.uv_systab = table;
 575                         pr_cont(" UVsystab=0x%lx ", table);
 576 #endif
 577                 } else if (!efi_guidcmp(guid, HCDP_TABLE_GUID)) {
 578                         efi.hcdp = table;
 579                         pr_cont(" HCDP=0x%lx ", table);
 580                 } else if (!efi_guidcmp(guid, UGA_IO_PROTOCOL_GUID)) {
 581                         efi.uga = table;
 582                         pr_cont(" UGA=0x%lx ", table);
 583                 }
 584                 tablep += sz;
 585         }
 586         pr_cont("\n");
 587         early_iounmap(config_tables, efi.systab->nr_tables * sz);
 588         return 0;
 589 }
 590
 591 static int __init efi_runtime_init(void)
 592 {
 593         efi_runtime_services_t *runtime;
 594
 595         /*
 596          * Check out the runtime services table. We need to map
 597          * the runtime services table so that we can grab the physical
 598          * address of several of the EFI runtime functions, needed to
 599          * set the firmware into virtual mode.
 600          */
 601         runtime = early_ioremap((unsigned long)efi.systab->runtime,
 602                                 sizeof(efi_runtime_services_t));
 603         if (!runtime) {
 604                 pr_err("Could not map the runtime service table!\n");
 605                 return -ENOMEM;
 606         }
 607         /*
 608          * We will only need *early* access to the following
 609          * EFI runtime service before set_virtual_address_map
 610          * is invoked.
 611          */
 612         efi_phys.set_virtual_address_map =
 613                 (efi_set_virtual_address_map_t *)
 614                 runtime->set_virtual_address_map;
 615
 616         early_iounmap(runtime, sizeof(efi_runtime_services_t));
 617
 618         return 0;
 619 }
 620
 621 static int __init efi_memmap_init(void)
 622 {
 623         /* Map the EFI memory map */
 624         memmap.map = early_ioremap((unsigned long)memmap.phys_map,
 625                                    memmap.nr_map * memmap.desc_size);
 626         if (memmap.map == NULL) {
 627                 pr_err("Could not map the memory map!\n");
 628                 return -ENOMEM;
 629         }
 630         memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
 631
 632         if (add_efi_memmap)
 633                 do_add_efi_memmap();
 634
 635         return 0;
 636 }
 637
 638 void __init efi_init(void)
 639 {
 640         efi_char16_t *c16;
 641         char vendor[100] = "unknown";
 642         int i = 0;
 643         void *tmp;
 644
 645 #ifdef CONFIG_X86_32
 646         if (boot_params.efi_info.efi_systab_hi ||
 647             boot_params.efi_info.efi_memmap_hi) {
 648                 pr_info("Table located above 4GB, disabling EFI.\n");
 649                 efi_enabled = 0;
 650                 return;
 651         }
 652         efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab;
 653         efi_native = !efi_64bit;
 654 #else
 655         efi_phys.systab = (efi_system_table_t *)
 656                           (boot_params.efi_info.efi_systab |
 657                           ((__u64)boot_params.efi_info.efi_systab_hi<<32));
 658         efi_native = efi_64bit;
 659 #endif
 660
 661         if (efi_systab_init(efi_phys.systab)) {
 662                 efi_enabled = 0;
 663                 return;
 664         }
 665
 666         /*
 667          * Show what we know for posterity
 668          */
 669         c16 = tmp = early_ioremap(efi.systab->fw_vendor, 2);
 670         if (c16) {
 671                 for (i = 0; i < sizeof(vendor) - 1 && *c16; ++i)
 672                         vendor[i] = *c16++;
 673                 vendor[i] = '\0';
 674         } else
 675                 pr_err("Could not map the firmware vendor!\n");
 676         early_iounmap(tmp, 2);
 677
 678         pr_info("EFI v%u.%.02u by %s\n",
 679                 efi.systab->hdr.revision >> 16,
 680                 efi.systab->hdr.revision & 0xffff, vendor);
 681
 682         if (efi_config_init(efi.systab->tables, efi.systab->nr_tables)) {
 683                 efi_enabled = 0;
 684                 return;
 685         }
 686
 687         /*
 688          * Note: We currently don't support runtime services on an EFI
 689          * that doesn't match the kernel 32/64-bit mode.
 690          */
 691
 692         if (!efi_native)
 693                 pr_info("No EFI runtime due to 32/64-bit mismatch with kernel\n");
 694         else if (efi_runtime_init()) {
 695                 efi_enabled = 0;
 696                 return;
 697         }
 698
 699         if (efi_memmap_init()) {
 700                 efi_enabled = 0;
 701                 return;
 702         }
 703         if (efi_native) {
 704                 x86_platform.get_wallclock = efi_get_time;
 705                 x86_platform.set_wallclock = efi_set_rtc_mmss;
 706         }
 707
 708 #if EFI_DEBUG
 709         print_efi_memmap();
 710 #endif
 711 }
 712
 713 void __init efi_set_executable(efi_memory_desc_t *md, bool executable)
 714 {
 715         u64 addr, npages;
 716
 717         addr = md->virt_addr;
 718         npages = md->num_pages;
 719
 720         memrange_efi_to_native(&addr, &npages);
 721
 722         if (executable)
 723                 set_memory_x(addr, npages);
 724         else
 725                 set_memory_nx(addr, npages);
 726 }
 727
 728 static void __init runtime_code_page_mkexec(void)
 729 {
 730         efi_memory_desc_t *md;
 731         void *p;
 732
 733         /* Make EFI runtime service code area executable */
 734         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 735                 md = p;
 736
 737                 if (md->type != EFI_RUNTIME_SERVICES_CODE)
 738                         continue;
 739
 740                 efi_set_executable(md, true);
 741         }
 742 }
 743
 744 /*
 745  * This function will switch the EFI runtime services to virtual mode.
 746  * Essentially, look through the EFI memmap and map every region that
 747  * has the runtime attribute bit set in its memory descriptor and update
 748  * that memory descriptor with the virtual address obtained from ioremap().
 749  * This enables the runtime services to be called without having to
 750  * thunk back into physical mode for every invocation.
 751  */
 752 void __init efi_enter_virtual_mode(void)
 753 {
 754         efi_memory_desc_t *md, *prev_md = NULL;
 755         efi_status_t status;
 756         unsigned long size;
 757         u64 end, systab, addr, npages, end_pfn;
 758         void *p, *va, *new_memmap = NULL;
 759         int count = 0;
 760
 761         efi.systab = NULL;
 762
 763         /*
 764          * We don't do virtual mode, since we don't do runtime services, on
 765          * non-native EFI
 766          */
 767
 768         if (!efi_native)
 769                 goto out;
 770
 771         /* Merge contiguous regions of the same type and attribute */
 772         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 773                 u64 prev_size;
 774                 md = p;
 775
 776                 if (!prev_md) {
 777                         prev_md = md;
 778                         continue;
 779                 }
 780
 781                 if (prev_md->type != md->type ||
 782                     prev_md->attribute != md->attribute) {
 783                         prev_md = md;
 784                         continue;
 785                 }
 786
 787                 prev_size = prev_md->num_pages << EFI_PAGE_SHIFT;
 788
 789                 if (md->phys_addr == (prev_md->phys_addr + prev_size)) {
 790                         prev_md->num_pages += md->num_pages;
 791                         md->type = EFI_RESERVED_TYPE;
 792                         md->attribute = 0;
 793                         continue;
 794                 }
 795                 prev_md = md;
 796         }
 797
 798         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 799                 md = p;
 800                 if (!(md->attribute & EFI_MEMORY_RUNTIME) &&
 801                     md->type != EFI_BOOT_SERVICES_CODE &&
 802                     md->type != EFI_BOOT_SERVICES_DATA)
 803                         continue;
 804
 805                 size = md->num_pages << EFI_PAGE_SHIFT;
 806                 end = md->phys_addr + size;
 807
 808                 end_pfn = PFN_UP(end);
 809                 if (end_pfn <= max_low_pfn_mapped
 810                     || (end_pfn > (1UL << (32 - PAGE_SHIFT))
 811                         && end_pfn <= max_pfn_mapped))
 812                         va = __va(md->phys_addr);
 813                 else
 814                         va = efi_ioremap(md->phys_addr, size, md->type);
 815
 816                 md->virt_addr = (u64) (unsigned long) va;
 817
 818                 if (!va) {
 819                         pr_err("ioremap of 0x%llX failed!\n",
 820                                (unsigned long long)md->phys_addr);
 821                         continue;
 822                 }
 823
 824                 if (!(md->attribute & EFI_MEMORY_WB)) {
 825                         addr = md->virt_addr;
 826                         npages = md->num_pages;
 827                         memrange_efi_to_native(&addr, &npages);
 828                         set_memory_uc(addr, npages);
 829                 }
 830
 831                 systab = (u64) (unsigned long) efi_phys.systab;
 832                 if (md->phys_addr <= systab && systab < end) {
 833                         systab += md->virt_addr - md->phys_addr;
 834                         efi.systab = (efi_system_table_t *) (unsigned long) systab;
 835                 }
 836                 new_memmap = krealloc(new_memmap,
 837                                       (count + 1) * memmap.desc_size,
 838                                       GFP_KERNEL);
 839                 memcpy(new_memmap + (count * memmap.desc_size), md,
 840                        memmap.desc_size);
 841                 count++;
 842         }
 843
 844         BUG_ON(!efi.systab);
 845
 846         status = phys_efi_set_virtual_address_map(
 847                 memmap.desc_size * count,
 848                 memmap.desc_size,
 849                 memmap.desc_version,
 850                 (efi_memory_desc_t *)__pa(new_memmap));
 851
 852         if (status != EFI_SUCCESS) {
 853                 pr_alert("Unable to switch EFI into virtual mode "
 854                          "(status=%lx)!\n", status);
 855                 panic("EFI call to SetVirtualAddressMap() failed!");
 856         }
 857
 858         /*
 859          * Thankfully, it does seem that no runtime services other than
 860          * SetVirtualAddressMap() will touch boot services code, so we can
 861          * get rid of it all at this point
 862          */
 863         efi_free_boot_services();
 864
 865         /*
 866          * Now that EFI is in virtual mode, update the function
 867          * pointers in the runtime service table to the new virtual addresses.
 868          *
 869          * Call EFI services through wrapper functions.
 870          */
 871         efi.get_time = virt_efi_get_time;
 872         efi.set_time = virt_efi_set_time;
 873         efi.get_wakeup_time = virt_efi_get_wakeup_time;
 874         efi.set_wakeup_time = virt_efi_set_wakeup_time;
 875         efi.get_variable = virt_efi_get_variable;
 876         efi.get_next_variable = virt_efi_get_next_variable;
 877         efi.set_variable = virt_efi_set_variable;
 878         efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count;
 879         efi.reset_system = virt_efi_reset_system;
 880         efi.set_virtual_address_map = NULL;
 881         efi.query_variable_info = virt_efi_query_variable_info;
 882         efi.update_capsule = virt_efi_update_capsule;
 883         efi.query_capsule_caps = virt_efi_query_capsule_caps;
 884         if (__supported_pte_mask & _PAGE_NX)
 885                 runtime_code_page_mkexec();
 886
 887 out:
 888         early_iounmap(memmap.map, memmap.nr_map * memmap.desc_size);
 889         memmap.map = NULL;
 890         kfree(new_memmap);
 891 }
 892
 893 /*
 894  * Convenience functions to obtain memory types and attributes
 895  */
 896 u32 efi_mem_type(unsigned long phys_addr)
 897 {
 898         efi_memory_desc_t *md;
 899         void *p;
 900
 901         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 902                 md = p;
 903                 if ((md->phys_addr <= phys_addr) &&
 904                     (phys_addr < (md->phys_addr +
 905                                   (md->num_pages << EFI_PAGE_SHIFT))))
 906                         return md->type;
 907         }
 908         return 0;
 909 }
 910
 911 u64 efi_mem_attributes(unsigned long phys_addr)
 912 {
 913         efi_memory_desc_t *md;
 914         void *p;
 915
 916         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 917                 md = p;
 918                 if ((md->phys_addr <= phys_addr) &&
 919                     (phys_addr < (md->phys_addr +
 920                                   (md->num_pages << EFI_PAGE_SHIFT))))
 921                         return md->attribute;
 922         }
 923         return 0;
 924 }