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