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/efi-bgrt.h>
  35 #include <linux/export.h>
  36 #include <linux/bootmem.h>
  37 #include <linux/memblock.h>
  38 #include <linux/spinlock.h>
  39 #include <linux/uaccess.h>
  40 #include <linux/time.h>
  41 #include <linux/io.h>
  42 #include <linux/reboot.h>
  43 #include <linux/bcd.h>
  44
  45 #include <asm/setup.h>
  46 #include <asm/efi.h>
  47 #include <asm/time.h>
  48 #include <asm/cacheflush.h>
  49 #include <asm/tlbflush.h>
  50 #include <asm/x86_init.h>
  51
  52 #define EFI_DEBUG       1
  53
  54 struct efi __read_mostly efi = {
  55         .mps        = EFI_INVALID_TABLE_ADDR,
  56         .acpi       = EFI_INVALID_TABLE_ADDR,
  57         .acpi20     = EFI_INVALID_TABLE_ADDR,
  58         .smbios     = EFI_INVALID_TABLE_ADDR,
  59         .sal_systab = EFI_INVALID_TABLE_ADDR,
  60         .boot_info  = EFI_INVALID_TABLE_ADDR,
  61         .hcdp       = EFI_INVALID_TABLE_ADDR,
  62         .uga        = EFI_INVALID_TABLE_ADDR,
  63         .uv_systab  = EFI_INVALID_TABLE_ADDR,
  64 };
  65 EXPORT_SYMBOL(efi);
  66
  67 struct efi_memory_map memmap;
  68
  69 static struct efi efi_phys __initdata;
  70 static efi_system_table_t efi_systab __initdata;
  71
  72 static inline bool efi_is_native(void)
  73 {
  74         return IS_ENABLED(CONFIG_X86_64) == efi_enabled(EFI_64BIT);
  75 }
  76
  77 unsigned long x86_efi_facility;
  78
  79 /*
  80  * Returns 1 if 'facility' is enabled, 0 otherwise.
  81  */
  82 int efi_enabled(int facility)
  83 {
  84         return test_bit(facility, &x86_efi_facility) != 0;
  85 }
  86 EXPORT_SYMBOL(efi_enabled);
  87
  88 static bool __initdata disable_runtime = false;
  89 static int __init setup_noefi(char *arg)
  90 {
  91         disable_runtime = true;
  92         return 0;
  93 }
  94 early_param("noefi", setup_noefi);
  95
  96 int add_efi_memmap;
  97 EXPORT_SYMBOL(add_efi_memmap);
  98
  99 static int __init setup_add_efi_memmap(char *arg)
 100 {
 101         add_efi_memmap = 1;
 102         return 0;
 103 }
 104 early_param("add_efi_memmap", setup_add_efi_memmap);
 105
 106
 107 static efi_status_t virt_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
 108 {
 109         unsigned long flags;
 110         efi_status_t status;
 111
 112         spin_lock_irqsave(&rtc_lock, flags);
 113         status = efi_call_virt2(get_time, tm, tc);
 114         spin_unlock_irqrestore(&rtc_lock, flags);
 115         return status;
 116 }
 117
 118 static efi_status_t virt_efi_set_time(efi_time_t *tm)
 119 {
 120         unsigned long flags;
 121         efi_status_t status;
 122
 123         spin_lock_irqsave(&rtc_lock, flags);
 124         status = efi_call_virt1(set_time, tm);
 125         spin_unlock_irqrestore(&rtc_lock, flags);
 126         return status;
 127 }
 128
 129 static efi_status_t virt_efi_get_wakeup_time(efi_bool_t *enabled,
 130                                              efi_bool_t *pending,
 131                                              efi_time_t *tm)
 132 {
 133         unsigned long flags;
 134         efi_status_t status;
 135
 136         spin_lock_irqsave(&rtc_lock, flags);
 137         status = efi_call_virt3(get_wakeup_time,
 138                                 enabled, pending, tm);
 139         spin_unlock_irqrestore(&rtc_lock, flags);
 140         return status;
 141 }
 142
 143 static efi_status_t virt_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
 144 {
 145         unsigned long flags;
 146         efi_status_t status;
 147
 148         spin_lock_irqsave(&rtc_lock, flags);
 149         status = efi_call_virt2(set_wakeup_time,
 150                                 enabled, tm);
 151         spin_unlock_irqrestore(&rtc_lock, flags);
 152         return status;
 153 }
 154
 155 static efi_status_t virt_efi_get_variable(efi_char16_t *name,
 156                                           efi_guid_t *vendor,
 157                                           u32 *attr,
 158                                           unsigned long *data_size,
 159                                           void *data)
 160 {
 161         return efi_call_virt5(get_variable,
 162                               name, vendor, attr,
 163                               data_size, data);
 164 }
 165
 166 static efi_status_t virt_efi_get_next_variable(unsigned long *name_size,
 167                                                efi_char16_t *name,
 168                                                efi_guid_t *vendor)
 169 {
 170         return efi_call_virt3(get_next_variable,
 171                               name_size, name, vendor);
 172 }
 173
 174 static efi_status_t virt_efi_set_variable(efi_char16_t *name,
 175                                           efi_guid_t *vendor,
 176                                           u32 attr,
 177                                           unsigned long data_size,
 178                                           void *data)
 179 {
 180         return efi_call_virt5(set_variable,
 181                               name, vendor, attr,
 182                               data_size, data);
 183 }
 184
 185 static efi_status_t virt_efi_query_variable_info(u32 attr,
 186                                                  u64 *storage_space,
 187                                                  u64 *remaining_space,
 188                                                  u64 *max_variable_size)
 189 {
 190         if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
 191                 return EFI_UNSUPPORTED;
 192
 193         return efi_call_virt4(query_variable_info, attr, storage_space,
 194                               remaining_space, max_variable_size);
 195 }
 196
 197 static efi_status_t virt_efi_get_next_high_mono_count(u32 *count)
 198 {
 199         return efi_call_virt1(get_next_high_mono_count, count);
 200 }
 201
 202 static void virt_efi_reset_system(int reset_type,
 203                                   efi_status_t status,
 204                                   unsigned long data_size,
 205                                   efi_char16_t *data)
 206 {
 207         efi_call_virt4(reset_system, reset_type, status,
 208                        data_size, data);
 209 }
 210
 211 static efi_status_t virt_efi_update_capsule(efi_capsule_header_t **capsules,
 212                                             unsigned long count,
 213                                             unsigned long sg_list)
 214 {
 215         if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
 216                 return EFI_UNSUPPORTED;
 217
 218         return efi_call_virt3(update_capsule, capsules, count, sg_list);
 219 }
 220
 221 static efi_status_t virt_efi_query_capsule_caps(efi_capsule_header_t **capsules,
 222                                                 unsigned long count,
 223                                                 u64 *max_size,
 224                                                 int *reset_type)
 225 {
 226         if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
 227                 return EFI_UNSUPPORTED;
 228
 229         return efi_call_virt4(query_capsule_caps, capsules, count, max_size,
 230                               reset_type);
 231 }
 232
 233 static efi_status_t __init phys_efi_set_virtual_address_map(
 234         unsigned long memory_map_size,
 235         unsigned long descriptor_size,
 236         u32 descriptor_version,
 237         efi_memory_desc_t *virtual_map)
 238 {
 239         efi_status_t status;
 240
 241         efi_call_phys_prelog();
 242         status = efi_call_phys4(efi_phys.set_virtual_address_map,
 243                                 memory_map_size, descriptor_size,
 244                                 descriptor_version, virtual_map);
 245         efi_call_phys_epilog();
 246         return status;
 247 }
 248
 249 static efi_status_t __init phys_efi_get_time(efi_time_t *tm,
 250                                              efi_time_cap_t *tc)
 251 {
 252         unsigned long flags;
 253         efi_status_t status;
 254
 255         spin_lock_irqsave(&rtc_lock, flags);
 256         efi_call_phys_prelog();
 257         status = efi_call_phys2(efi_phys.get_time, virt_to_phys(tm),
 258                                 virt_to_phys(tc));
 259         efi_call_phys_epilog();
 260         spin_unlock_irqrestore(&rtc_lock, flags);
 261         return status;
 262 }
 263
 264 int efi_set_rtc_mmss(unsigned long nowtime)
 265 {
 266         int real_seconds, real_minutes;
 267         efi_status_t    status;
 268         efi_time_t      eft;
 269         efi_time_cap_t  cap;
 270
 271         status = efi.get_time(&eft, &cap);
 272         if (status != EFI_SUCCESS) {
 273                 pr_err("Oops: efitime: can't read time!\n");
 274                 return -1;
 275         }
 276
 277         real_seconds = nowtime % 60;
 278         real_minutes = nowtime / 60;
 279         if (((abs(real_minutes - eft.minute) + 15)/30) & 1)
 280                 real_minutes += 30;
 281         real_minutes %= 60;
 282         eft.minute = real_minutes;
 283         eft.second = real_seconds;
 284
 285         status = efi.set_time(&eft);
 286         if (status != EFI_SUCCESS) {
 287                 pr_err("Oops: efitime: can't write time!\n");
 288                 return -1;
 289         }
 290         return 0;
 291 }
 292
 293 unsigned long efi_get_time(void)
 294 {
 295         efi_status_t status;
 296         efi_time_t eft;
 297         efi_time_cap_t cap;
 298
 299         status = efi.get_time(&eft, &cap);
 300         if (status != EFI_SUCCESS)
 301                 pr_err("Oops: efitime: can't read time!\n");
 302
 303         return mktime(eft.year, eft.month, eft.day, eft.hour,
 304                       eft.minute, eft.second);
 305 }
 306
 307 /*
 308  * Tell the kernel about the EFI memory map.  This might include
 309  * more than the max 128 entries that can fit in the e820 legacy
 310  * (zeropage) memory map.
 311  */
 312
 313 static void __init do_add_efi_memmap(void)
 314 {
 315         void *p;
 316
 317         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 318                 efi_memory_desc_t *md = p;
 319                 unsigned long long start = md->phys_addr;
 320                 unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
 321                 int e820_type;
 322
 323                 switch (md->type) {
 324                 case EFI_LOADER_CODE:
 325                 case EFI_LOADER_DATA:
 326                 case EFI_BOOT_SERVICES_CODE:
 327                 case EFI_BOOT_SERVICES_DATA:
 328                 case EFI_CONVENTIONAL_MEMORY:
 329                         if (md->attribute & EFI_MEMORY_WB)
 330                                 e820_type = E820_RAM;
 331                         else
 332                                 e820_type = E820_RESERVED;
 333                         break;
 334                 case EFI_ACPI_RECLAIM_MEMORY:
 335                         e820_type = E820_ACPI;
 336                         break;
 337                 case EFI_ACPI_MEMORY_NVS:
 338                         e820_type = E820_NVS;
 339                         break;
 340                 case EFI_UNUSABLE_MEMORY:
 341                         e820_type = E820_UNUSABLE;
 342                         break;
 343                 default:
 344                         /*
 345                          * EFI_RESERVED_TYPE EFI_RUNTIME_SERVICES_CODE
 346                          * EFI_RUNTIME_SERVICES_DATA EFI_MEMORY_MAPPED_IO
 347                          * EFI_MEMORY_MAPPED_IO_PORT_SPACE EFI_PAL_CODE
 348                          */
 349                         e820_type = E820_RESERVED;
 350                         break;
 351                 }
 352                 e820_add_region(start, size, e820_type);
 353         }
 354         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 355 }
 356
 357 int __init efi_memblock_x86_reserve_range(void)
 358 {
 359         unsigned long pmap;
 360
 361 #ifdef CONFIG_X86_32
 362         /* Can't handle data above 4GB at this time */
 363         if (boot_params.efi_info.efi_memmap_hi) {
 364                 pr_err("Memory map is above 4GB, disabling EFI.\n");
 365                 return -EINVAL;
 366         }
 367         pmap = boot_params.efi_info.efi_memmap;
 368 #else
 369         pmap = (boot_params.efi_info.efi_memmap |
 370                 ((__u64)boot_params.efi_info.efi_memmap_hi<<32));
 371 #endif
 372         memmap.phys_map = (void *)pmap;
 373         memmap.nr_map = boot_params.efi_info.efi_memmap_size /
 374                 boot_params.efi_info.efi_memdesc_size;
 375         memmap.desc_version = boot_params.efi_info.efi_memdesc_version;
 376         memmap.desc_size = boot_params.efi_info.efi_memdesc_size;
 377         memblock_reserve(pmap, memmap.nr_map * memmap.desc_size);
 378
 379         return 0;
 380 }
 381
 382 #if EFI_DEBUG
 383 static void __init print_efi_memmap(void)
 384 {
 385         efi_memory_desc_t *md;
 386         void *p;
 387         int i;
 388
 389         for (p = memmap.map, i = 0;
 390              p < memmap.map_end;
 391              p += memmap.desc_size, i++) {
 392                 md = p;
 393                 pr_info("mem%02u: type=%u, attr=0x%llx, "
 394                         "range=[0x%016llx-0x%016llx) (%lluMB)\n",
 395                         i, md->type, md->attribute, md->phys_addr,
 396                         md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
 397                         (md->num_pages >> (20 - EFI_PAGE_SHIFT)));
 398         }
 399 }
 400 #endif  /*  EFI_DEBUG  */
 401
 402 void __init efi_reserve_boot_services(void)
 403 {
 404         void *p;
 405
 406         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 407                 efi_memory_desc_t *md = p;
 408                 u64 start = md->phys_addr;
 409                 u64 size = md->num_pages << EFI_PAGE_SHIFT;
 410
 411                 if (md->type != EFI_BOOT_SERVICES_CODE &&
 412                     md->type != EFI_BOOT_SERVICES_DATA)
 413                         continue;
 414                 /* Only reserve where possible:
 415                  * - Not within any already allocated areas
 416                  * - Not over any memory area (really needed, if above?)
 417                  * - Not within any part of the kernel
 418                  * - Not the bios reserved area
 419                 */
 420                 if ((start+size >= virt_to_phys(_text)
 421                                 && start <= virt_to_phys(_end)) ||
 422                         !e820_all_mapped(start, start+size, E820_RAM) ||
 423                         memblock_is_region_reserved(start, size)) {
 424                         /* Could not reserve, skip it */
 425                         md->num_pages = 0;
 426                         memblock_dbg("Could not reserve boot range "
 427                                         "[0x%010llx-0x%010llx]\n",
 428                                                 start, start+size-1);
 429                 } else
 430                         memblock_reserve(start, size);
 431         }
 432 }
 433
 434 void __init efi_unmap_memmap(void)
 435 {
 436         clear_bit(EFI_MEMMAP, &x86_efi_facility);
 437         if (memmap.map) {
 438                 early_iounmap(memmap.map, memmap.nr_map * memmap.desc_size);
 439                 memmap.map = NULL;
 440         }
 441 }
 442
 443 void __init efi_free_boot_services(void)
 444 {
 445         void *p;
 446
 447         if (!efi_is_native())
 448                 return;
 449
 450         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 451                 efi_memory_desc_t *md = p;
 452                 unsigned long long start = md->phys_addr;
 453                 unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
 454
 455                 if (md->type != EFI_BOOT_SERVICES_CODE &&
 456                     md->type != EFI_BOOT_SERVICES_DATA)
 457                         continue;
 458
 459                 /* Could not reserve boot area */
 460                 if (!size)
 461                         continue;
 462
 463                 free_bootmem_late(start, size);
 464         }
 465
 466         efi_unmap_memmap();
 467 }
 468
 469 static int __init efi_systab_init(void *phys)
 470 {
 471         if (efi_enabled(EFI_64BIT)) {
 472                 efi_system_table_64_t *systab64;
 473                 u64 tmp = 0;
 474
 475                 systab64 = early_ioremap((unsigned long)phys,
 476                                          sizeof(*systab64));
 477                 if (systab64 == NULL) {
 478                         pr_err("Couldn't map the system table!\n");
 479                         return -ENOMEM;
 480                 }
 481
 482                 efi_systab.hdr = systab64->hdr;
 483                 efi_systab.fw_vendor = systab64->fw_vendor;
 484                 tmp |= systab64->fw_vendor;
 485                 efi_systab.fw_revision = systab64->fw_revision;
 486                 efi_systab.con_in_handle = systab64->con_in_handle;
 487                 tmp |= systab64->con_in_handle;
 488                 efi_systab.con_in = systab64->con_in;
 489                 tmp |= systab64->con_in;
 490                 efi_systab.con_out_handle = systab64->con_out_handle;
 491                 tmp |= systab64->con_out_handle;
 492                 efi_systab.con_out = systab64->con_out;
 493                 tmp |= systab64->con_out;
 494                 efi_systab.stderr_handle = systab64->stderr_handle;
 495                 tmp |= systab64->stderr_handle;
 496                 efi_systab.stderr = systab64->stderr;
 497                 tmp |= systab64->stderr;
 498                 efi_systab.runtime = (void *)(unsigned long)systab64->runtime;
 499                 tmp |= systab64->runtime;
 500                 efi_systab.boottime = (void *)(unsigned long)systab64->boottime;
 501                 tmp |= systab64->boottime;
 502                 efi_systab.nr_tables = systab64->nr_tables;
 503                 efi_systab.tables = systab64->tables;
 504                 tmp |= systab64->tables;
 505
 506                 early_iounmap(systab64, sizeof(*systab64));
 507 #ifdef CONFIG_X86_32
 508                 if (tmp >> 32) {
 509                         pr_err("EFI data located above 4GB, disabling EFI.\n");
 510                         return -EINVAL;
 511                 }
 512 #endif
 513         } else {
 514                 efi_system_table_32_t *systab32;
 515
 516                 systab32 = early_ioremap((unsigned long)phys,
 517                                          sizeof(*systab32));
 518                 if (systab32 == NULL) {
 519                         pr_err("Couldn't map the system table!\n");
 520                         return -ENOMEM;
 521                 }
 522
 523                 efi_systab.hdr = systab32->hdr;
 524                 efi_systab.fw_vendor = systab32->fw_vendor;
 525                 efi_systab.fw_revision = systab32->fw_revision;
 526                 efi_systab.con_in_handle = systab32->con_in_handle;
 527                 efi_systab.con_in = systab32->con_in;
 528                 efi_systab.con_out_handle = systab32->con_out_handle;
 529                 efi_systab.con_out = systab32->con_out;
 530                 efi_systab.stderr_handle = systab32->stderr_handle;
 531                 efi_systab.stderr = systab32->stderr;
 532                 efi_systab.runtime = (void *)(unsigned long)systab32->runtime;
 533                 efi_systab.boottime = (void *)(unsigned long)systab32->boottime;
 534                 efi_systab.nr_tables = systab32->nr_tables;
 535                 efi_systab.tables = systab32->tables;
 536
 537                 early_iounmap(systab32, sizeof(*systab32));
 538         }
 539
 540         efi.systab = &efi_systab;
 541
 542         /*
 543          * Verify the EFI Table
 544          */
 545         if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) {
 546                 pr_err("System table signature incorrect!\n");
 547                 return -EINVAL;
 548         }
 549         if ((efi.systab->hdr.revision >> 16) == 0)
 550                 pr_err("Warning: System table version "
 551                        "%d.%02d, expected 1.00 or greater!\n",
 552                        efi.systab->hdr.revision >> 16,
 553                        efi.systab->hdr.revision & 0xffff);
 554
 555         return 0;
 556 }
 557
 558 static int __init efi_config_init(u64 tables, int nr_tables)
 559 {
 560         void *config_tables, *tablep;
 561         int i, sz;
 562
 563         if (efi_enabled(EFI_64BIT))
 564                 sz = sizeof(efi_config_table_64_t);
 565         else
 566                 sz = sizeof(efi_config_table_32_t);
 567
 568         /*
 569          * Let's see what config tables the firmware passed to us.
 570          */
 571         config_tables = early_ioremap(tables, nr_tables * sz);
 572         if (config_tables == NULL) {
 573                 pr_err("Could not map Configuration table!\n");
 574                 return -ENOMEM;
 575         }
 576
 577         tablep = config_tables;
 578         pr_info("");
 579         for (i = 0; i < efi.systab->nr_tables; i++) {
 580                 efi_guid_t guid;
 581                 unsigned long table;
 582
 583                 if (efi_enabled(EFI_64BIT)) {
 584                         u64 table64;
 585                         guid = ((efi_config_table_64_t *)tablep)->guid;
 586                         table64 = ((efi_config_table_64_t *)tablep)->table;
 587                         table = table64;
 588 #ifdef CONFIG_X86_32
 589                         if (table64 >> 32) {
 590                                 pr_cont("\n");
 591                                 pr_err("Table located above 4GB, disabling EFI.\n");
 592                                 early_iounmap(config_tables,
 593                                               efi.systab->nr_tables * sz);
 594                                 return -EINVAL;
 595                         }
 596 #endif
 597                 } else {
 598                         guid = ((efi_config_table_32_t *)tablep)->guid;
 599                         table = ((efi_config_table_32_t *)tablep)->table;
 600                 }
 601                 if (!efi_guidcmp(guid, MPS_TABLE_GUID)) {
 602                         efi.mps = table;
 603                         pr_cont(" MPS=0x%lx ", table);
 604                 } else if (!efi_guidcmp(guid, ACPI_20_TABLE_GUID)) {
 605                         efi.acpi20 = table;
 606                         pr_cont(" ACPI 2.0=0x%lx ", table);
 607                 } else if (!efi_guidcmp(guid, ACPI_TABLE_GUID)) {
 608                         efi.acpi = table;
 609                         pr_cont(" ACPI=0x%lx ", table);
 610                 } else if (!efi_guidcmp(guid, SMBIOS_TABLE_GUID)) {
 611                         efi.smbios = table;
 612                         pr_cont(" SMBIOS=0x%lx ", table);
 613 #ifdef CONFIG_X86_UV
 614                 } else if (!efi_guidcmp(guid, UV_SYSTEM_TABLE_GUID)) {
 615                         efi.uv_systab = table;
 616                         pr_cont(" UVsystab=0x%lx ", table);
 617 #endif
 618                 } else if (!efi_guidcmp(guid, HCDP_TABLE_GUID)) {
 619                         efi.hcdp = table;
 620                         pr_cont(" HCDP=0x%lx ", table);
 621                 } else if (!efi_guidcmp(guid, UGA_IO_PROTOCOL_GUID)) {
 622                         efi.uga = table;
 623                         pr_cont(" UGA=0x%lx ", table);
 624                 }
 625                 tablep += sz;
 626         }
 627         pr_cont("\n");
 628         early_iounmap(config_tables, efi.systab->nr_tables * sz);
 629         return 0;
 630 }
 631
 632 static int __init efi_runtime_init(void)
 633 {
 634         efi_runtime_services_t *runtime;
 635
 636         /*
 637          * Check out the runtime services table. We need to map
 638          * the runtime services table so that we can grab the physical
 639          * address of several of the EFI runtime functions, needed to
 640          * set the firmware into virtual mode.
 641          */
 642         runtime = early_ioremap((unsigned long)efi.systab->runtime,
 643                                 sizeof(efi_runtime_services_t));
 644         if (!runtime) {
 645                 pr_err("Could not map the runtime service table!\n");
 646                 return -ENOMEM;
 647         }
 648         /*
 649          * We will only need *early* access to the following
 650          * two EFI runtime services before set_virtual_address_map
 651          * is invoked.
 652          */
 653         efi_phys.get_time = (efi_get_time_t *)runtime->get_time;
 654         efi_phys.set_virtual_address_map =
 655                 (efi_set_virtual_address_map_t *)
 656                 runtime->set_virtual_address_map;
 657         /*
 658          * Make efi_get_time can be called before entering
 659          * virtual mode.
 660          */
 661         efi.get_time = phys_efi_get_time;
 662         early_iounmap(runtime, sizeof(efi_runtime_services_t));
 663
 664         return 0;
 665 }
 666
 667 static int __init efi_memmap_init(void)
 668 {
 669         /* Map the EFI memory map */
 670         memmap.map = early_ioremap((unsigned long)memmap.phys_map,
 671                                    memmap.nr_map * memmap.desc_size);
 672         if (memmap.map == NULL) {
 673                 pr_err("Could not map the memory map!\n");
 674                 return -ENOMEM;
 675         }
 676         memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
 677
 678         if (add_efi_memmap)
 679                 do_add_efi_memmap();
 680
 681         return 0;
 682 }
 683
 684 void __init efi_init(void)
 685 {
 686         efi_char16_t *c16;
 687         char vendor[100] = "unknown";
 688         int i = 0;
 689         void *tmp;
 690
 691 #ifdef CONFIG_X86_32
 692         if (boot_params.efi_info.efi_systab_hi ||
 693             boot_params.efi_info.efi_memmap_hi) {
 694                 pr_info("Table located above 4GB, disabling EFI.\n");
 695                 return;
 696         }
 697         efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab;
 698 #else
 699         efi_phys.systab = (efi_system_table_t *)
 700                           (boot_params.efi_info.efi_systab |
 701                           ((__u64)boot_params.efi_info.efi_systab_hi<<32));
 702 #endif
 703
 704         if (efi_systab_init(efi_phys.systab))
 705                 return;
 706
 707         set_bit(EFI_SYSTEM_TABLES, &x86_efi_facility);
 708
 709         /*
 710          * Show what we know for posterity
 711          */
 712         c16 = tmp = early_ioremap(efi.systab->fw_vendor, 2);
 713         if (c16) {
 714                 for (i = 0; i < sizeof(vendor) - 1 && *c16; ++i)
 715                         vendor[i] = *c16++;
 716                 vendor[i] = '\0';
 717         } else
 718                 pr_err("Could not map the firmware vendor!\n");
 719         early_iounmap(tmp, 2);
 720
 721         pr_info("EFI v%u.%.02u by %s\n",
 722                 efi.systab->hdr.revision >> 16,
 723                 efi.systab->hdr.revision & 0xffff, vendor);
 724
 725         if (efi_config_init(efi.systab->tables, efi.systab->nr_tables))
 726                 return;
 727
 728         set_bit(EFI_CONFIG_TABLES, &x86_efi_facility);
 729
 730         /*
 731          * Note: We currently don't support runtime services on an EFI
 732          * that doesn't match the kernel 32/64-bit mode.
 733          */
 734
 735         if (!efi_is_native())
 736                 pr_info("No EFI runtime due to 32/64-bit mismatch with kernel\n");
 737         else {
 738                 if (disable_runtime || efi_runtime_init())
 739                         return;
 740                 set_bit(EFI_RUNTIME_SERVICES, &x86_efi_facility);
 741         }
 742
 743         if (efi_memmap_init())
 744                 return;
 745
 746         set_bit(EFI_MEMMAP, &x86_efi_facility);
 747
 748 #ifdef CONFIG_X86_32
 749         if (efi_is_native()) {
 750                 x86_platform.get_wallclock = efi_get_time;
 751                 x86_platform.set_wallclock = efi_set_rtc_mmss;
 752         }
 753 #endif
 754
 755 #if EFI_DEBUG
 756         print_efi_memmap();
 757 #endif
 758 }
 759
 760 void __init efi_late_init(void)
 761 {
 762         efi_bgrt_init();
 763 }
 764
 765 void __init efi_set_executable(efi_memory_desc_t *md, bool executable)
 766 {
 767         u64 addr, npages;
 768
 769         addr = md->virt_addr;
 770         npages = md->num_pages;
 771
 772         memrange_efi_to_native(&addr, &npages);
 773
 774         if (executable)
 775                 set_memory_x(addr, npages);
 776         else
 777                 set_memory_nx(addr, npages);
 778 }
 779
 780 static void __init runtime_code_page_mkexec(void)
 781 {
 782         efi_memory_desc_t *md;
 783         void *p;
 784
 785         /* Make EFI runtime service code area executable */
 786         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 787                 md = p;
 788
 789                 if (md->type != EFI_RUNTIME_SERVICES_CODE)
 790                         continue;
 791
 792                 efi_set_executable(md, true);
 793         }
 794 }
 795
 796 /*
 797  * We can't ioremap data in EFI boot services RAM, because we've already mapped
 798  * it as RAM.  So, look it up in the existing EFI memory map instead.  Only
 799  * callable after efi_enter_virtual_mode and before efi_free_boot_services.
 800  */
 801 void __iomem *efi_lookup_mapped_addr(u64 phys_addr)
 802 {
 803         void *p;
 804         if (WARN_ON(!memmap.map))
 805                 return NULL;
 806         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 807                 efi_memory_desc_t *md = p;
 808                 u64 size = md->num_pages << EFI_PAGE_SHIFT;
 809                 u64 end = md->phys_addr + size;
 810                 if (!(md->attribute & EFI_MEMORY_RUNTIME) &&
 811                     md->type != EFI_BOOT_SERVICES_CODE &&
 812                     md->type != EFI_BOOT_SERVICES_DATA)
 813                         continue;
 814                 if (!md->virt_addr)
 815                         continue;
 816                 if (phys_addr >= md->phys_addr && phys_addr < end) {
 817                         phys_addr += md->virt_addr - md->phys_addr;
 818                         return (__force void __iomem *)(unsigned long)phys_addr;
 819                 }
 820         }
 821         return NULL;
 822 }
 823
 824 void efi_memory_uc(u64 addr, unsigned long size)
 825 {
 826         unsigned long page_shift = 1UL << EFI_PAGE_SHIFT;
 827         u64 npages;
 828
 829         npages = round_up(size, page_shift) / page_shift;
 830         memrange_efi_to_native(&addr, &npages);
 831         set_memory_uc(addr, npages);
 832 }
 833
 834 /*
 835  * This function will switch the EFI runtime services to virtual mode.
 836  * Essentially, look through the EFI memmap and map every region that
 837  * has the runtime attribute bit set in its memory descriptor and update
 838  * that memory descriptor with the virtual address obtained from ioremap().
 839  * This enables the runtime services to be called without having to
 840  * thunk back into physical mode for every invocation.
 841  */
 842 void __init efi_enter_virtual_mode(void)
 843 {
 844         efi_memory_desc_t *md, *prev_md = NULL;
 845         efi_status_t status;
 846         unsigned long size;
 847         u64 end, systab, end_pfn;
 848         void *p, *va, *new_memmap = NULL;
 849         int count = 0;
 850
 851         efi.systab = NULL;
 852
 853         /*
 854          * We don't do virtual mode, since we don't do runtime services, on
 855          * non-native EFI
 856          */
 857
 858         if (!efi_is_native()) {
 859                 efi_unmap_memmap();
 860                 return;
 861         }
 862
 863         /* Merge contiguous regions of the same type and attribute */
 864         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 865                 u64 prev_size;
 866                 md = p;
 867
 868                 if (!prev_md) {
 869                         prev_md = md;
 870                         continue;
 871                 }
 872
 873                 if (prev_md->type != md->type ||
 874                     prev_md->attribute != md->attribute) {
 875                         prev_md = md;
 876                         continue;
 877                 }
 878
 879                 prev_size = prev_md->num_pages << EFI_PAGE_SHIFT;
 880
 881                 if (md->phys_addr == (prev_md->phys_addr + prev_size)) {
 882                         prev_md->num_pages += md->num_pages;
 883                         md->type = EFI_RESERVED_TYPE;
 884                         md->attribute = 0;
 885                         continue;
 886                 }
 887                 prev_md = md;
 888         }
 889
 890         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 891                 md = p;
 892                 if (!(md->attribute & EFI_MEMORY_RUNTIME) &&
 893                     md->type != EFI_BOOT_SERVICES_CODE &&
 894                     md->type != EFI_BOOT_SERVICES_DATA)
 895                         continue;
 896
 897                 size = md->num_pages << EFI_PAGE_SHIFT;
 898                 end = md->phys_addr + size;
 899
 900                 end_pfn = PFN_UP(end);
 901                 if (end_pfn <= max_low_pfn_mapped
 902                     || (end_pfn > (1UL << (32 - PAGE_SHIFT))
 903                         && end_pfn <= max_pfn_mapped)) {
 904                         va = __va(md->phys_addr);
 905
 906                         if (!(md->attribute & EFI_MEMORY_WB))
 907                                 efi_memory_uc((u64)(unsigned long)va, size);
 908                 } else
 909                         va = efi_ioremap(md->phys_addr, size,
 910                                          md->type, md->attribute);
 911
 912                 md->virt_addr = (u64) (unsigned long) va;
 913
 914                 if (!va) {
 915                         pr_err("ioremap of 0x%llX failed!\n",
 916                                (unsigned long long)md->phys_addr);
 917                         continue;
 918                 }
 919
 920                 systab = (u64) (unsigned long) efi_phys.systab;
 921                 if (md->phys_addr <= systab && systab < end) {
 922                         systab += md->virt_addr - md->phys_addr;
 923                         efi.systab = (efi_system_table_t *) (unsigned long) systab;
 924                 }
 925                 new_memmap = krealloc(new_memmap,
 926                                       (count + 1) * memmap.desc_size,
 927                                       GFP_KERNEL);
 928                 memcpy(new_memmap + (count * memmap.desc_size), md,
 929                        memmap.desc_size);
 930                 count++;
 931         }
 932
 933         BUG_ON(!efi.systab);
 934
 935         status = phys_efi_set_virtual_address_map(
 936                 memmap.desc_size * count,
 937                 memmap.desc_size,
 938                 memmap.desc_version,
 939                 (efi_memory_desc_t *)__pa(new_memmap));
 940
 941         if (status != EFI_SUCCESS) {
 942                 pr_alert("Unable to switch EFI into virtual mode "
 943                          "(status=%lx)!\n", status);
 944                 panic("EFI call to SetVirtualAddressMap() failed!");
 945         }
 946
 947         /*
 948          * Now that EFI is in virtual mode, update the function
 949          * pointers in the runtime service table to the new virtual addresses.
 950          *
 951          * Call EFI services through wrapper functions.
 952          */
 953         efi.runtime_version = efi_systab.hdr.revision;
 954         efi.get_time = virt_efi_get_time;
 955         efi.set_time = virt_efi_set_time;
 956         efi.get_wakeup_time = virt_efi_get_wakeup_time;
 957         efi.set_wakeup_time = virt_efi_set_wakeup_time;
 958         efi.get_variable = virt_efi_get_variable;
 959         efi.get_next_variable = virt_efi_get_next_variable;
 960         efi.set_variable = virt_efi_set_variable;
 961         efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count;
 962         efi.reset_system = virt_efi_reset_system;
 963         efi.set_virtual_address_map = NULL;
 964         efi.query_variable_info = virt_efi_query_variable_info;
 965         efi.update_capsule = virt_efi_update_capsule;
 966         efi.query_capsule_caps = virt_efi_query_capsule_caps;
 967         if (__supported_pte_mask & _PAGE_NX)
 968                 runtime_code_page_mkexec();
 969
 970         kfree(new_memmap);
 971 }
 972
 973 /*
 974  * Convenience functions to obtain memory types and attributes
 975  */
 976 u32 efi_mem_type(unsigned long phys_addr)
 977 {
 978         efi_memory_desc_t *md;
 979         void *p;
 980
 981         if (!efi_enabled(EFI_MEMMAP))
 982                 return 0;
 983
 984         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 985                 md = p;
 986                 if ((md->phys_addr <= phys_addr) &&
 987                     (phys_addr < (md->phys_addr +
 988                                   (md->num_pages << EFI_PAGE_SHIFT))))
 989                         return md->type;
 990         }
 991         return 0;
 992 }
 993
 994 u64 efi_mem_attributes(unsigned long phys_addr)
 995 {
 996         efi_memory_desc_t *md;
 997         void *p;
 998
 999         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
1000                 md = p;
1001                 if ((md->phys_addr <= phys_addr) &&
1002                     (phys_addr < (md->phys_addr +
1003                                   (md->num_pages << EFI_PAGE_SHIFT))))
1004                         return md->attribute;
1005         }
1006         return 0;
1007 }