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 efi_status_t __init phys_efi_get_time(efi_time_t *tm,
 238                                              efi_time_cap_t *tc)
 239 {
 240         unsigned long flags;
 241         efi_status_t status;
 242
 243         spin_lock_irqsave(&rtc_lock, flags);
 244         efi_call_phys_prelog();
 245         status = efi_call_phys2(efi_phys.get_time, virt_to_phys(tm),
 246                                 virt_to_phys(tc));
 247         efi_call_phys_epilog();
 248         spin_unlock_irqrestore(&rtc_lock, flags);
 249         return status;
 250 }
 251
 252 int efi_set_rtc_mmss(unsigned long nowtime)
 253 {
 254         int real_seconds, real_minutes;
 255         efi_status_t    status;
 256         efi_time_t      eft;
 257         efi_time_cap_t  cap;
 258
 259         status = efi.get_time(&eft, &cap);
 260         if (status != EFI_SUCCESS) {
 261                 pr_err("Oops: efitime: can't read time!\n");
 262                 return -1;
 263         }
 264
 265         real_seconds = nowtime % 60;
 266         real_minutes = nowtime / 60;
 267         if (((abs(real_minutes - eft.minute) + 15)/30) & 1)
 268                 real_minutes += 30;
 269         real_minutes %= 60;
 270         eft.minute = real_minutes;
 271         eft.second = real_seconds;
 272
 273         status = efi.set_time(&eft);
 274         if (status != EFI_SUCCESS) {
 275                 pr_err("Oops: efitime: can't write time!\n");
 276                 return -1;
 277         }
 278         return 0;
 279 }
 280
 281 unsigned long efi_get_time(void)
 282 {
 283         efi_status_t status;
 284         efi_time_t eft;
 285         efi_time_cap_t cap;
 286
 287         status = efi.get_time(&eft, &cap);
 288         if (status != EFI_SUCCESS)
 289                 pr_err("Oops: efitime: can't read time!\n");
 290
 291         return mktime(eft.year, eft.month, eft.day, eft.hour,
 292                       eft.minute, eft.second);
 293 }
 294
 295 /*
 296  * Tell the kernel about the EFI memory map.  This might include
 297  * more than the max 128 entries that can fit in the e820 legacy
 298  * (zeropage) memory map.
 299  */
 300
 301 static void __init do_add_efi_memmap(void)
 302 {
 303         void *p;
 304
 305         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 306                 efi_memory_desc_t *md = p;
 307                 unsigned long long start = md->phys_addr;
 308                 unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
 309                 int e820_type;
 310
 311                 switch (md->type) {
 312                 case EFI_LOADER_CODE:
 313                 case EFI_LOADER_DATA:
 314                 case EFI_BOOT_SERVICES_CODE:
 315                 case EFI_BOOT_SERVICES_DATA:
 316                 case EFI_CONVENTIONAL_MEMORY:
 317                         if (md->attribute & EFI_MEMORY_WB)
 318                                 e820_type = E820_RAM;
 319                         else
 320                                 e820_type = E820_RESERVED;
 321                         break;
 322                 case EFI_ACPI_RECLAIM_MEMORY:
 323                         e820_type = E820_ACPI;
 324                         break;
 325                 case EFI_ACPI_MEMORY_NVS:
 326                         e820_type = E820_NVS;
 327                         break;
 328                 case EFI_UNUSABLE_MEMORY:
 329                         e820_type = E820_UNUSABLE;
 330                         break;
 331                 default:
 332                         /*
 333                          * EFI_RESERVED_TYPE EFI_RUNTIME_SERVICES_CODE
 334                          * EFI_RUNTIME_SERVICES_DATA EFI_MEMORY_MAPPED_IO
 335                          * EFI_MEMORY_MAPPED_IO_PORT_SPACE EFI_PAL_CODE
 336                          */
 337                         e820_type = E820_RESERVED;
 338                         break;
 339                 }
 340                 e820_add_region(start, size, e820_type);
 341         }
 342         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 343 }
 344
 345 int __init efi_memblock_x86_reserve_range(void)
 346 {
 347         unsigned long pmap;
 348
 349 #ifdef CONFIG_X86_32
 350         /* Can't handle data above 4GB at this time */
 351         if (boot_params.efi_info.efi_memmap_hi) {
 352                 pr_err("Memory map is above 4GB, disabling EFI.\n");
 353                 return -EINVAL;
 354         }
 355         pmap = boot_params.efi_info.efi_memmap;
 356 #else
 357         pmap = (boot_params.efi_info.efi_memmap |
 358                 ((__u64)boot_params.efi_info.efi_memmap_hi<<32));
 359 #endif
 360         memmap.phys_map = (void *)pmap;
 361         memmap.nr_map = boot_params.efi_info.efi_memmap_size /
 362                 boot_params.efi_info.efi_memdesc_size;
 363         memmap.desc_version = boot_params.efi_info.efi_memdesc_version;
 364         memmap.desc_size = boot_params.efi_info.efi_memdesc_size;
 365         memblock_reserve(pmap, memmap.nr_map * memmap.desc_size);
 366
 367         return 0;
 368 }
 369
 370 #if EFI_DEBUG
 371 static void __init print_efi_memmap(void)
 372 {
 373         efi_memory_desc_t *md;
 374         void *p;
 375         int i;
 376
 377         for (p = memmap.map, i = 0;
 378              p < memmap.map_end;
 379              p += memmap.desc_size, i++) {
 380                 md = p;
 381                 pr_info("mem%02u: type=%u, attr=0x%llx, "
 382                         "range=[0x%016llx-0x%016llx) (%lluMB)\n",
 383                         i, md->type, md->attribute, md->phys_addr,
 384                         md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
 385                         (md->num_pages >> (20 - EFI_PAGE_SHIFT)));
 386         }
 387 }
 388 #endif  /*  EFI_DEBUG  */
 389
 390 void __init efi_reserve_boot_services(void)
 391 {
 392         void *p;
 393
 394         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 395                 efi_memory_desc_t *md = p;
 396                 u64 start = md->phys_addr;
 397                 u64 size = md->num_pages << EFI_PAGE_SHIFT;
 398
 399                 if (md->type != EFI_BOOT_SERVICES_CODE &&
 400                     md->type != EFI_BOOT_SERVICES_DATA)
 401                         continue;
 402                 /* Only reserve where possible:
 403                  * - Not within any already allocated areas
 404                  * - Not over any memory area (really needed, if above?)
 405                  * - Not within any part of the kernel
 406                  * - Not the bios reserved area
 407                 */
 408                 if ((start+size >= virt_to_phys(_text)
 409                                 && start <= virt_to_phys(_end)) ||
 410                         !e820_all_mapped(start, start+size, E820_RAM) ||
 411                         memblock_is_region_reserved(start, size)) {
 412                         /* Could not reserve, skip it */
 413                         md->num_pages = 0;
 414                         memblock_dbg("Could not reserve boot range "
 415                                         "[0x%010llx-0x%010llx]\n",
 416                                                 start, start+size-1);
 417                 } else
 418                         memblock_reserve(start, size);
 419         }
 420 }
 421
 422 static void __init efi_unmap_memmap(void)
 423 {
 424         if (memmap.map) {
 425                 early_iounmap(memmap.map, memmap.nr_map * memmap.desc_size);
 426                 memmap.map = NULL;
 427         }
 428 }
 429
 430 void __init efi_free_boot_services(void)
 431 {
 432         void *p;
 433
 434         if (!efi_native)
 435                 return;
 436
 437         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 438                 efi_memory_desc_t *md = p;
 439                 unsigned long long start = md->phys_addr;
 440                 unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
 441
 442                 if (md->type != EFI_BOOT_SERVICES_CODE &&
 443                     md->type != EFI_BOOT_SERVICES_DATA)
 444                         continue;
 445
 446                 /* Could not reserve boot area */
 447                 if (!size)
 448                         continue;
 449
 450                 free_bootmem_late(start, size);
 451         }
 452
 453         efi_unmap_memmap();
 454 }
 455
 456 static int __init efi_systab_init(void *phys)
 457 {
 458         if (efi_64bit) {
 459                 efi_system_table_64_t *systab64;
 460                 u64 tmp = 0;
 461
 462                 systab64 = early_ioremap((unsigned long)phys,
 463                                          sizeof(*systab64));
 464                 if (systab64 == NULL) {
 465                         pr_err("Couldn't map the system table!\n");
 466                         return -ENOMEM;
 467                 }
 468
 469                 efi_systab.hdr = systab64->hdr;
 470                 efi_systab.fw_vendor = systab64->fw_vendor;
 471                 tmp |= systab64->fw_vendor;
 472                 efi_systab.fw_revision = systab64->fw_revision;
 473                 efi_systab.con_in_handle = systab64->con_in_handle;
 474                 tmp |= systab64->con_in_handle;
 475                 efi_systab.con_in = systab64->con_in;
 476                 tmp |= systab64->con_in;
 477                 efi_systab.con_out_handle = systab64->con_out_handle;
 478                 tmp |= systab64->con_out_handle;
 479                 efi_systab.con_out = systab64->con_out;
 480                 tmp |= systab64->con_out;
 481                 efi_systab.stderr_handle = systab64->stderr_handle;
 482                 tmp |= systab64->stderr_handle;
 483                 efi_systab.stderr = systab64->stderr;
 484                 tmp |= systab64->stderr;
 485                 efi_systab.runtime = (void *)(unsigned long)systab64->runtime;
 486                 tmp |= systab64->runtime;
 487                 efi_systab.boottime = (void *)(unsigned long)systab64->boottime;
 488                 tmp |= systab64->boottime;
 489                 efi_systab.nr_tables = systab64->nr_tables;
 490                 efi_systab.tables = systab64->tables;
 491                 tmp |= systab64->tables;
 492
 493                 early_iounmap(systab64, sizeof(*systab64));
 494 #ifdef CONFIG_X86_32
 495                 if (tmp >> 32) {
 496                         pr_err("EFI data located above 4GB, disabling EFI.\n");
 497                         return -EINVAL;
 498                 }
 499 #endif
 500         } else {
 501                 efi_system_table_32_t *systab32;
 502
 503                 systab32 = early_ioremap((unsigned long)phys,
 504                                          sizeof(*systab32));
 505                 if (systab32 == NULL) {
 506                         pr_err("Couldn't map the system table!\n");
 507                         return -ENOMEM;
 508                 }
 509
 510                 efi_systab.hdr = systab32->hdr;
 511                 efi_systab.fw_vendor = systab32->fw_vendor;
 512                 efi_systab.fw_revision = systab32->fw_revision;
 513                 efi_systab.con_in_handle = systab32->con_in_handle;
 514                 efi_systab.con_in = systab32->con_in;
 515                 efi_systab.con_out_handle = systab32->con_out_handle;
 516                 efi_systab.con_out = systab32->con_out;
 517                 efi_systab.stderr_handle = systab32->stderr_handle;
 518                 efi_systab.stderr = systab32->stderr;
 519                 efi_systab.runtime = (void *)(unsigned long)systab32->runtime;
 520                 efi_systab.boottime = (void *)(unsigned long)systab32->boottime;
 521                 efi_systab.nr_tables = systab32->nr_tables;
 522                 efi_systab.tables = systab32->tables;
 523
 524                 early_iounmap(systab32, sizeof(*systab32));
 525         }
 526
 527         efi.systab = &efi_systab;
 528
 529         /*
 530          * Verify the EFI Table
 531          */
 532         if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) {
 533                 pr_err("System table signature incorrect!\n");
 534                 return -EINVAL;
 535         }
 536         if ((efi.systab->hdr.revision >> 16) == 0)
 537                 pr_err("Warning: System table version "
 538                        "%d.%02d, expected 1.00 or greater!\n",
 539                        efi.systab->hdr.revision >> 16,
 540                        efi.systab->hdr.revision & 0xffff);
 541
 542         return 0;
 543 }
 544
 545 static int __init efi_config_init(u64 tables, int nr_tables)
 546 {
 547         void *config_tables, *tablep;
 548         int i, sz;
 549
 550         if (efi_64bit)
 551                 sz = sizeof(efi_config_table_64_t);
 552         else
 553                 sz = sizeof(efi_config_table_32_t);
 554
 555         /*
 556          * Let's see what config tables the firmware passed to us.
 557          */
 558         config_tables = early_ioremap(tables, nr_tables * sz);
 559         if (config_tables == NULL) {
 560                 pr_err("Could not map Configuration table!\n");
 561                 return -ENOMEM;
 562         }
 563
 564         tablep = config_tables;
 565         pr_info("");
 566         for (i = 0; i < efi.systab->nr_tables; i++) {
 567                 efi_guid_t guid;
 568                 unsigned long table;
 569
 570                 if (efi_64bit) {
 571                         u64 table64;
 572                         guid = ((efi_config_table_64_t *)tablep)->guid;
 573                         table64 = ((efi_config_table_64_t *)tablep)->table;
 574                         table = table64;
 575 #ifdef CONFIG_X86_32
 576                         if (table64 >> 32) {
 577                                 pr_cont("\n");
 578                                 pr_err("Table located above 4GB, disabling EFI.\n");
 579                                 early_iounmap(config_tables,
 580                                               efi.systab->nr_tables * sz);
 581                                 return -EINVAL;
 582                         }
 583 #endif
 584                 } else {
 585                         guid = ((efi_config_table_32_t *)tablep)->guid;
 586                         table = ((efi_config_table_32_t *)tablep)->table;
 587                 }
 588                 if (!efi_guidcmp(guid, MPS_TABLE_GUID)) {
 589                         efi.mps = table;
 590                         pr_cont(" MPS=0x%lx ", table);
 591                 } else if (!efi_guidcmp(guid, ACPI_20_TABLE_GUID)) {
 592                         efi.acpi20 = table;
 593                         pr_cont(" ACPI 2.0=0x%lx ", table);
 594                 } else if (!efi_guidcmp(guid, ACPI_TABLE_GUID)) {
 595                         efi.acpi = table;
 596                         pr_cont(" ACPI=0x%lx ", table);
 597                 } else if (!efi_guidcmp(guid, SMBIOS_TABLE_GUID)) {
 598                         efi.smbios = table;
 599                         pr_cont(" SMBIOS=0x%lx ", table);
 600 #ifdef CONFIG_X86_UV
 601                 } else if (!efi_guidcmp(guid, UV_SYSTEM_TABLE_GUID)) {
 602                         efi.uv_systab = table;
 603                         pr_cont(" UVsystab=0x%lx ", table);
 604 #endif
 605                 } else if (!efi_guidcmp(guid, HCDP_TABLE_GUID)) {
 606                         efi.hcdp = table;
 607                         pr_cont(" HCDP=0x%lx ", table);
 608                 } else if (!efi_guidcmp(guid, UGA_IO_PROTOCOL_GUID)) {
 609                         efi.uga = table;
 610                         pr_cont(" UGA=0x%lx ", table);
 611                 }
 612                 tablep += sz;
 613         }
 614         pr_cont("\n");
 615         early_iounmap(config_tables, efi.systab->nr_tables * sz);
 616         return 0;
 617 }
 618
 619 static int __init efi_runtime_init(void)
 620 {
 621         efi_runtime_services_t *runtime;
 622
 623         /*
 624          * Check out the runtime services table. We need to map
 625          * the runtime services table so that we can grab the physical
 626          * address of several of the EFI runtime functions, needed to
 627          * set the firmware into virtual mode.
 628          */
 629         runtime = early_ioremap((unsigned long)efi.systab->runtime,
 630                                 sizeof(efi_runtime_services_t));
 631         if (!runtime) {
 632                 pr_err("Could not map the runtime service table!\n");
 633                 return -ENOMEM;
 634         }
 635         /*
 636          * We will only need *early* access to the following
 637          * two EFI runtime services before set_virtual_address_map
 638          * is invoked.
 639          */
 640         efi_phys.get_time = (efi_get_time_t *)runtime->get_time;
 641         efi_phys.set_virtual_address_map =
 642                 (efi_set_virtual_address_map_t *)
 643                 runtime->set_virtual_address_map;
 644         /*
 645          * Make efi_get_time can be called before entering
 646          * virtual mode.
 647          */
 648         efi.get_time = phys_efi_get_time;
 649         early_iounmap(runtime, sizeof(efi_runtime_services_t));
 650
 651         return 0;
 652 }
 653
 654 static int __init efi_memmap_init(void)
 655 {
 656         /* Map the EFI memory map */
 657         memmap.map = early_ioremap((unsigned long)memmap.phys_map,
 658                                    memmap.nr_map * memmap.desc_size);
 659         if (memmap.map == NULL) {
 660                 pr_err("Could not map the memory map!\n");
 661                 return -ENOMEM;
 662         }
 663         memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
 664
 665         if (add_efi_memmap)
 666                 do_add_efi_memmap();
 667
 668         return 0;
 669 }
 670
 671 void __init efi_init(void)
 672 {
 673         efi_char16_t *c16;
 674         char vendor[100] = "unknown";
 675         int i = 0;
 676         void *tmp;
 677
 678 #ifdef CONFIG_X86_32
 679         if (boot_params.efi_info.efi_systab_hi ||
 680             boot_params.efi_info.efi_memmap_hi) {
 681                 pr_info("Table located above 4GB, disabling EFI.\n");
 682                 efi_enabled = 0;
 683                 return;
 684         }
 685         efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab;
 686         efi_native = !efi_64bit;
 687 #else
 688         efi_phys.systab = (efi_system_table_t *)
 689                           (boot_params.efi_info.efi_systab |
 690                           ((__u64)boot_params.efi_info.efi_systab_hi<<32));
 691         efi_native = efi_64bit;
 692 #endif
 693
 694         if (efi_systab_init(efi_phys.systab)) {
 695                 efi_enabled = 0;
 696                 return;
 697         }
 698
 699         /*
 700          * Show what we know for posterity
 701          */
 702         c16 = tmp = early_ioremap(efi.systab->fw_vendor, 2);
 703         if (c16) {
 704                 for (i = 0; i < sizeof(vendor) - 1 && *c16; ++i)
 705                         vendor[i] = *c16++;
 706                 vendor[i] = '\0';
 707         } else
 708                 pr_err("Could not map the firmware vendor!\n");
 709         early_iounmap(tmp, 2);
 710
 711         pr_info("EFI v%u.%.02u by %s\n",
 712                 efi.systab->hdr.revision >> 16,
 713                 efi.systab->hdr.revision & 0xffff, vendor);
 714
 715         if (efi_config_init(efi.systab->tables, efi.systab->nr_tables)) {
 716                 efi_enabled = 0;
 717                 return;
 718         }
 719
 720         /*
 721          * Note: We currently don't support runtime services on an EFI
 722          * that doesn't match the kernel 32/64-bit mode.
 723          */
 724
 725         if (!efi_native)
 726                 pr_info("No EFI runtime due to 32/64-bit mismatch with kernel\n");
 727         else if (efi_runtime_init()) {
 728                 efi_enabled = 0;
 729                 return;
 730         }
 731
 732         if (efi_memmap_init()) {
 733                 efi_enabled = 0;
 734                 return;
 735         }
 736 #ifdef CONFIG_X86_32
 737         if (efi_native) {
 738                 x86_platform.get_wallclock = efi_get_time;
 739                 x86_platform.set_wallclock = efi_set_rtc_mmss;
 740         }
 741 #endif
 742
 743 #if EFI_DEBUG
 744         print_efi_memmap();
 745 #endif
 746 }
 747
 748 void __init efi_set_executable(efi_memory_desc_t *md, bool executable)
 749 {
 750         u64 addr, npages;
 751
 752         addr = md->virt_addr;
 753         npages = md->num_pages;
 754
 755         memrange_efi_to_native(&addr, &npages);
 756
 757         if (executable)
 758                 set_memory_x(addr, npages);
 759         else
 760                 set_memory_nx(addr, npages);
 761 }
 762
 763 static void __init runtime_code_page_mkexec(void)
 764 {
 765         efi_memory_desc_t *md;
 766         void *p;
 767
 768         /* Make EFI runtime service code area executable */
 769         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 770                 md = p;
 771
 772                 if (md->type != EFI_RUNTIME_SERVICES_CODE)
 773                         continue;
 774
 775                 efi_set_executable(md, true);
 776         }
 777 }
 778
 779 /*
 780  * This function will switch the EFI runtime services to virtual mode.
 781  * Essentially, look through the EFI memmap and map every region that
 782  * has the runtime attribute bit set in its memory descriptor and update
 783  * that memory descriptor with the virtual address obtained from ioremap().
 784  * This enables the runtime services to be called without having to
 785  * thunk back into physical mode for every invocation.
 786  */
 787 void __init efi_enter_virtual_mode(void)
 788 {
 789         efi_memory_desc_t *md, *prev_md = NULL;
 790         efi_status_t status;
 791         unsigned long size;
 792         u64 end, systab, addr, npages, end_pfn;
 793         void *p, *va, *new_memmap = NULL;
 794         int count = 0;
 795
 796         efi.systab = NULL;
 797
 798         /*
 799          * We don't do virtual mode, since we don't do runtime services, on
 800          * non-native EFI
 801          */
 802
 803         if (!efi_native) {
 804                 efi_unmap_memmap();
 805                 return;
 806         }
 807
 808         /* Merge contiguous regions of the same type and attribute */
 809         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 810                 u64 prev_size;
 811                 md = p;
 812
 813                 if (!prev_md) {
 814                         prev_md = md;
 815                         continue;
 816                 }
 817
 818                 if (prev_md->type != md->type ||
 819                     prev_md->attribute != md->attribute) {
 820                         prev_md = md;
 821                         continue;
 822                 }
 823
 824                 prev_size = prev_md->num_pages << EFI_PAGE_SHIFT;
 825
 826                 if (md->phys_addr == (prev_md->phys_addr + prev_size)) {
 827                         prev_md->num_pages += md->num_pages;
 828                         md->type = EFI_RESERVED_TYPE;
 829                         md->attribute = 0;
 830                         continue;
 831                 }
 832                 prev_md = md;
 833         }
 834
 835         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 836                 md = p;
 837                 if (!(md->attribute & EFI_MEMORY_RUNTIME) &&
 838                     md->type != EFI_BOOT_SERVICES_CODE &&
 839                     md->type != EFI_BOOT_SERVICES_DATA)
 840                         continue;
 841
 842                 size = md->num_pages << EFI_PAGE_SHIFT;
 843                 end = md->phys_addr + size;
 844
 845                 end_pfn = PFN_UP(end);
 846                 if (end_pfn <= max_low_pfn_mapped
 847                     || (end_pfn > (1UL << (32 - PAGE_SHIFT))
 848                         && end_pfn <= max_pfn_mapped))
 849                         va = __va(md->phys_addr);
 850                 else
 851                         va = efi_ioremap(md->phys_addr, size, md->type);
 852
 853                 md->virt_addr = (u64) (unsigned long) va;
 854
 855                 if (!va) {
 856                         pr_err("ioremap of 0x%llX failed!\n",
 857                                (unsigned long long)md->phys_addr);
 858                         continue;
 859                 }
 860
 861                 if (!(md->attribute & EFI_MEMORY_WB)) {
 862                         addr = md->virt_addr;
 863                         npages = md->num_pages;
 864                         memrange_efi_to_native(&addr, &npages);
 865                         set_memory_uc(addr, npages);
 866                 }
 867
 868                 systab = (u64) (unsigned long) efi_phys.systab;
 869                 if (md->phys_addr <= systab && systab < end) {
 870                         systab += md->virt_addr - md->phys_addr;
 871                         efi.systab = (efi_system_table_t *) (unsigned long) systab;
 872                 }
 873                 new_memmap = krealloc(new_memmap,
 874                                       (count + 1) * memmap.desc_size,
 875                                       GFP_KERNEL);
 876                 memcpy(new_memmap + (count * memmap.desc_size), md,
 877                        memmap.desc_size);
 878                 count++;
 879         }
 880
 881         BUG_ON(!efi.systab);
 882
 883         status = phys_efi_set_virtual_address_map(
 884                 memmap.desc_size * count,
 885                 memmap.desc_size,
 886                 memmap.desc_version,
 887                 (efi_memory_desc_t *)__pa(new_memmap));
 888
 889         if (status != EFI_SUCCESS) {
 890                 pr_alert("Unable to switch EFI into virtual mode "
 891                          "(status=%lx)!\n", status);
 892                 panic("EFI call to SetVirtualAddressMap() failed!");
 893         }
 894
 895         /*
 896          * Now that EFI is in virtual mode, update the function
 897          * pointers in the runtime service table to the new virtual addresses.
 898          *
 899          * Call EFI services through wrapper functions.
 900          */
 901         efi.runtime_version = efi_systab.fw_revision;
 902         efi.get_time = virt_efi_get_time;
 903         efi.set_time = virt_efi_set_time;
 904         efi.get_wakeup_time = virt_efi_get_wakeup_time;
 905         efi.set_wakeup_time = virt_efi_set_wakeup_time;
 906         efi.get_variable = virt_efi_get_variable;
 907         efi.get_next_variable = virt_efi_get_next_variable;
 908         efi.set_variable = virt_efi_set_variable;
 909         efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count;
 910         efi.reset_system = virt_efi_reset_system;
 911         efi.set_virtual_address_map = NULL;
 912         efi.query_variable_info = virt_efi_query_variable_info;
 913         efi.update_capsule = virt_efi_update_capsule;
 914         efi.query_capsule_caps = virt_efi_query_capsule_caps;
 915         if (__supported_pte_mask & _PAGE_NX)
 916                 runtime_code_page_mkexec();
 917
 918         kfree(new_memmap);
 919 }
 920
 921 /*
 922  * Convenience functions to obtain memory types and attributes
 923  */
 924 u32 efi_mem_type(unsigned long phys_addr)
 925 {
 926         efi_memory_desc_t *md;
 927         void *p;
 928
 929         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 930                 md = p;
 931                 if ((md->phys_addr <= phys_addr) &&
 932                     (phys_addr < (md->phys_addr +
 933                                   (md->num_pages << EFI_PAGE_SHIFT))))
 934                         return md->type;
 935         }
 936         return 0;
 937 }
 938
 939 u64 efi_mem_attributes(unsigned long phys_addr)
 940 {
 941         efi_memory_desc_t *md;
 942         void *p;
 943
 944         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 945                 md = p;
 946                 if ((md->phys_addr <= phys_addr) &&
 947                     (phys_addr < (md->phys_addr +
 948                                   (md->num_pages << EFI_PAGE_SHIFT))))
 949                         return md->attribute;
 950         }
 951         return 0;
 952 }