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 int efi_enabled;
  55 EXPORT_SYMBOL(efi_enabled);
  56
  57 struct efi __read_mostly efi = {
  58         .mps        = EFI_INVALID_TABLE_ADDR,
  59         .acpi       = EFI_INVALID_TABLE_ADDR,
  60         .acpi20     = EFI_INVALID_TABLE_ADDR,
  61         .smbios     = EFI_INVALID_TABLE_ADDR,
  62         .sal_systab = EFI_INVALID_TABLE_ADDR,
  63         .boot_info  = EFI_INVALID_TABLE_ADDR,
  64         .hcdp       = EFI_INVALID_TABLE_ADDR,
  65         .uga        = EFI_INVALID_TABLE_ADDR,
  66         .uv_systab  = EFI_INVALID_TABLE_ADDR,
  67 };
  68 EXPORT_SYMBOL(efi);
  69
  70 struct efi_memory_map memmap;
  71
  72 bool efi_64bit;
  73
  74 static struct efi efi_phys __initdata;
  75 static efi_system_table_t efi_systab __initdata;
  76
  77 static inline bool efi_is_native(void)
  78 {
  79         return IS_ENABLED(CONFIG_X86_64) == efi_64bit;
  80 }
  81
  82 static int __init setup_noefi(char *arg)
  83 {
  84         efi_enabled = 0;
  85         return 0;
  86 }
  87 early_param("noefi", setup_noefi);
  88
  89 int add_efi_memmap;
  90 EXPORT_SYMBOL(add_efi_memmap);
  91
  92 static int __init setup_add_efi_memmap(char *arg)
  93 {
  94         add_efi_memmap = 1;
  95         return 0;
  96 }
  97 early_param("add_efi_memmap", setup_add_efi_memmap);
  98
  99
 100 static efi_status_t virt_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
 101 {
 102         unsigned long flags;
 103         efi_status_t status;
 104
 105         spin_lock_irqsave(&rtc_lock, flags);
 106         status = efi_call_virt2(get_time, tm, tc);
 107         spin_unlock_irqrestore(&rtc_lock, flags);
 108         return status;
 109 }
 110
 111 static efi_status_t virt_efi_set_time(efi_time_t *tm)
 112 {
 113         unsigned long flags;
 114         efi_status_t status;
 115
 116         spin_lock_irqsave(&rtc_lock, flags);
 117         status = efi_call_virt1(set_time, tm);
 118         spin_unlock_irqrestore(&rtc_lock, flags);
 119         return status;
 120 }
 121
 122 static efi_status_t virt_efi_get_wakeup_time(efi_bool_t *enabled,
 123                                              efi_bool_t *pending,
 124                                              efi_time_t *tm)
 125 {
 126         unsigned long flags;
 127         efi_status_t status;
 128
 129         spin_lock_irqsave(&rtc_lock, flags);
 130         status = efi_call_virt3(get_wakeup_time,
 131                                 enabled, pending, tm);
 132         spin_unlock_irqrestore(&rtc_lock, flags);
 133         return status;
 134 }
 135
 136 static efi_status_t virt_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
 137 {
 138         unsigned long flags;
 139         efi_status_t status;
 140
 141         spin_lock_irqsave(&rtc_lock, flags);
 142         status = efi_call_virt2(set_wakeup_time,
 143                                 enabled, tm);
 144         spin_unlock_irqrestore(&rtc_lock, flags);
 145         return status;
 146 }
 147
 148 static efi_status_t virt_efi_get_variable(efi_char16_t *name,
 149                                           efi_guid_t *vendor,
 150                                           u32 *attr,
 151                                           unsigned long *data_size,
 152                                           void *data)
 153 {
 154         return efi_call_virt5(get_variable,
 155                               name, vendor, attr,
 156                               data_size, data);
 157 }
 158
 159 static efi_status_t virt_efi_get_next_variable(unsigned long *name_size,
 160                                                efi_char16_t *name,
 161                                                efi_guid_t *vendor)
 162 {
 163         return efi_call_virt3(get_next_variable,
 164                               name_size, name, vendor);
 165 }
 166
 167 static efi_status_t virt_efi_set_variable(efi_char16_t *name,
 168                                           efi_guid_t *vendor,
 169                                           u32 attr,
 170                                           unsigned long data_size,
 171                                           void *data)
 172 {
 173         return efi_call_virt5(set_variable,
 174                               name, vendor, attr,
 175                               data_size, data);
 176 }
 177
 178 static efi_status_t virt_efi_query_variable_info(u32 attr,
 179                                                  u64 *storage_space,
 180                                                  u64 *remaining_space,
 181                                                  u64 *max_variable_size)
 182 {
 183         if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
 184                 return EFI_UNSUPPORTED;
 185
 186         return efi_call_virt4(query_variable_info, attr, storage_space,
 187                               remaining_space, max_variable_size);
 188 }
 189
 190 static efi_status_t virt_efi_get_next_high_mono_count(u32 *count)
 191 {
 192         return efi_call_virt1(get_next_high_mono_count, count);
 193 }
 194
 195 static void virt_efi_reset_system(int reset_type,
 196                                   efi_status_t status,
 197                                   unsigned long data_size,
 198                                   efi_char16_t *data)
 199 {
 200         efi_call_virt4(reset_system, reset_type, status,
 201                        data_size, data);
 202 }
 203
 204 static efi_status_t virt_efi_update_capsule(efi_capsule_header_t **capsules,
 205                                             unsigned long count,
 206                                             unsigned long sg_list)
 207 {
 208         if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
 209                 return EFI_UNSUPPORTED;
 210
 211         return efi_call_virt3(update_capsule, capsules, count, sg_list);
 212 }
 213
 214 static efi_status_t virt_efi_query_capsule_caps(efi_capsule_header_t **capsules,
 215                                                 unsigned long count,
 216                                                 u64 *max_size,
 217                                                 int *reset_type)
 218 {
 219         if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
 220                 return EFI_UNSUPPORTED;
 221
 222         return efi_call_virt4(query_capsule_caps, capsules, count, max_size,
 223                               reset_type);
 224 }
 225
 226 static efi_status_t __init phys_efi_set_virtual_address_map(
 227         unsigned long memory_map_size,
 228         unsigned long descriptor_size,
 229         u32 descriptor_version,
 230         efi_memory_desc_t *virtual_map)
 231 {
 232         efi_status_t status;
 233
 234         efi_call_phys_prelog();
 235         status = efi_call_phys4(efi_phys.set_virtual_address_map,
 236                                 memory_map_size, descriptor_size,
 237                                 descriptor_version, virtual_map);
 238         efi_call_phys_epilog();
 239         return status;
 240 }
 241
 242 static efi_status_t __init phys_efi_get_time(efi_time_t *tm,
 243                                              efi_time_cap_t *tc)
 244 {
 245         unsigned long flags;
 246         efi_status_t status;
 247
 248         spin_lock_irqsave(&rtc_lock, flags);
 249         efi_call_phys_prelog();
 250         status = efi_call_phys2(efi_phys.get_time, virt_to_phys(tm),
 251                                 virt_to_phys(tc));
 252         efi_call_phys_epilog();
 253         spin_unlock_irqrestore(&rtc_lock, flags);
 254         return status;
 255 }
 256
 257 int efi_set_rtc_mmss(unsigned long nowtime)
 258 {
 259         int real_seconds, real_minutes;
 260         efi_status_t    status;
 261         efi_time_t      eft;
 262         efi_time_cap_t  cap;
 263
 264         status = efi.get_time(&eft, &cap);
 265         if (status != EFI_SUCCESS) {
 266                 pr_err("Oops: efitime: can't read time!\n");
 267                 return -1;
 268         }
 269
 270         real_seconds = nowtime % 60;
 271         real_minutes = nowtime / 60;
 272         if (((abs(real_minutes - eft.minute) + 15)/30) & 1)
 273                 real_minutes += 30;
 274         real_minutes %= 60;
 275         eft.minute = real_minutes;
 276         eft.second = real_seconds;
 277
 278         status = efi.set_time(&eft);
 279         if (status != EFI_SUCCESS) {
 280                 pr_err("Oops: efitime: can't write time!\n");
 281                 return -1;
 282         }
 283         return 0;
 284 }
 285
 286 unsigned long efi_get_time(void)
 287 {
 288         efi_status_t status;
 289         efi_time_t eft;
 290         efi_time_cap_t cap;
 291
 292         status = efi.get_time(&eft, &cap);
 293         if (status != EFI_SUCCESS)
 294                 pr_err("Oops: efitime: can't read time!\n");
 295
 296         return mktime(eft.year, eft.month, eft.day, eft.hour,
 297                       eft.minute, eft.second);
 298 }
 299
 300 /*
 301  * Tell the kernel about the EFI memory map.  This might include
 302  * more than the max 128 entries that can fit in the e820 legacy
 303  * (zeropage) memory map.
 304  */
 305
 306 static void __init do_add_efi_memmap(void)
 307 {
 308         void *p;
 309
 310         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 311                 efi_memory_desc_t *md = p;
 312                 unsigned long long start = md->phys_addr;
 313                 unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
 314                 int e820_type;
 315
 316                 switch (md->type) {
 317                 case EFI_LOADER_CODE:
 318                 case EFI_LOADER_DATA:
 319                 case EFI_BOOT_SERVICES_CODE:
 320                 case EFI_BOOT_SERVICES_DATA:
 321                 case EFI_CONVENTIONAL_MEMORY:
 322                         if (md->attribute & EFI_MEMORY_WB)
 323                                 e820_type = E820_RAM;
 324                         else
 325                                 e820_type = E820_RESERVED;
 326                         break;
 327                 case EFI_ACPI_RECLAIM_MEMORY:
 328                         e820_type = E820_ACPI;
 329                         break;
 330                 case EFI_ACPI_MEMORY_NVS:
 331                         e820_type = E820_NVS;
 332                         break;
 333                 case EFI_UNUSABLE_MEMORY:
 334                         e820_type = E820_UNUSABLE;
 335                         break;
 336                 default:
 337                         /*
 338                          * EFI_RESERVED_TYPE EFI_RUNTIME_SERVICES_CODE
 339                          * EFI_RUNTIME_SERVICES_DATA EFI_MEMORY_MAPPED_IO
 340                          * EFI_MEMORY_MAPPED_IO_PORT_SPACE EFI_PAL_CODE
 341                          */
 342                         e820_type = E820_RESERVED;
 343                         break;
 344                 }
 345                 e820_add_region(start, size, e820_type);
 346         }
 347         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 348 }
 349
 350 int __init efi_memblock_x86_reserve_range(void)
 351 {
 352         unsigned long pmap;
 353
 354 #ifdef CONFIG_X86_32
 355         /* Can't handle data above 4GB at this time */
 356         if (boot_params.efi_info.efi_memmap_hi) {
 357                 pr_err("Memory map is above 4GB, disabling EFI.\n");
 358                 return -EINVAL;
 359         }
 360         pmap = boot_params.efi_info.efi_memmap;
 361 #else
 362         pmap = (boot_params.efi_info.efi_memmap |
 363                 ((__u64)boot_params.efi_info.efi_memmap_hi<<32));
 364 #endif
 365         memmap.phys_map = (void *)pmap;
 366         memmap.nr_map = boot_params.efi_info.efi_memmap_size /
 367                 boot_params.efi_info.efi_memdesc_size;
 368         memmap.desc_version = boot_params.efi_info.efi_memdesc_version;
 369         memmap.desc_size = boot_params.efi_info.efi_memdesc_size;
 370         memblock_reserve(pmap, memmap.nr_map * memmap.desc_size);
 371
 372         return 0;
 373 }
 374
 375 #if EFI_DEBUG
 376 static void __init print_efi_memmap(void)
 377 {
 378         efi_memory_desc_t *md;
 379         void *p;
 380         int i;
 381
 382         for (p = memmap.map, i = 0;
 383              p < memmap.map_end;
 384              p += memmap.desc_size, i++) {
 385                 md = p;
 386                 pr_info("mem%02u: type=%u, attr=0x%llx, "
 387                         "range=[0x%016llx-0x%016llx) (%lluMB)\n",
 388                         i, md->type, md->attribute, md->phys_addr,
 389                         md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
 390                         (md->num_pages >> (20 - EFI_PAGE_SHIFT)));
 391         }
 392 }
 393 #endif  /*  EFI_DEBUG  */
 394
 395 void __init efi_reserve_boot_services(void)
 396 {
 397         void *p;
 398
 399         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 400                 efi_memory_desc_t *md = p;
 401                 u64 start = md->phys_addr;
 402                 u64 size = md->num_pages << EFI_PAGE_SHIFT;
 403
 404                 if (md->type != EFI_BOOT_SERVICES_CODE &&
 405                     md->type != EFI_BOOT_SERVICES_DATA)
 406                         continue;
 407                 /* Only reserve where possible:
 408                  * - Not within any already allocated areas
 409                  * - Not over any memory area (really needed, if above?)
 410                  * - Not within any part of the kernel
 411                  * - Not the bios reserved area
 412                 */
 413                 if ((start+size >= virt_to_phys(_text)
 414                                 && start <= virt_to_phys(_end)) ||
 415                         !e820_all_mapped(start, start+size, E820_RAM) ||
 416                         memblock_is_region_reserved(start, size)) {
 417                         /* Could not reserve, skip it */
 418                         md->num_pages = 0;
 419                         memblock_dbg("Could not reserve boot range "
 420                                         "[0x%010llx-0x%010llx]\n",
 421                                                 start, start+size-1);
 422                 } else
 423                         memblock_reserve(start, size);
 424         }
 425 }
 426
 427 void __init efi_unmap_memmap(void)
 428 {
 429         if (memmap.map) {
 430                 early_iounmap(memmap.map, memmap.nr_map * memmap.desc_size);
 431                 memmap.map = NULL;
 432         }
 433 }
 434
 435 void __init efi_free_boot_services(void)
 436 {
 437         void *p;
 438
 439         if (!efi_is_native())
 440                 return;
 441
 442         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 443                 efi_memory_desc_t *md = p;
 444                 unsigned long long start = md->phys_addr;
 445                 unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
 446
 447                 if (md->type != EFI_BOOT_SERVICES_CODE &&
 448                     md->type != EFI_BOOT_SERVICES_DATA)
 449                         continue;
 450
 451                 /* Could not reserve boot area */
 452                 if (!size)
 453                         continue;
 454
 455                 free_bootmem_late(start, size);
 456         }
 457
 458         efi_unmap_memmap();
 459 }
 460
 461 static int __init efi_systab_init(void *phys)
 462 {
 463         if (efi_64bit) {
 464                 efi_system_table_64_t *systab64;
 465                 u64 tmp = 0;
 466
 467                 systab64 = early_ioremap((unsigned long)phys,
 468                                          sizeof(*systab64));
 469                 if (systab64 == NULL) {
 470                         pr_err("Couldn't map the system table!\n");
 471                         return -ENOMEM;
 472                 }
 473
 474                 efi_systab.hdr = systab64->hdr;
 475                 efi_systab.fw_vendor = systab64->fw_vendor;
 476                 tmp |= systab64->fw_vendor;
 477                 efi_systab.fw_revision = systab64->fw_revision;
 478                 efi_systab.con_in_handle = systab64->con_in_handle;
 479                 tmp |= systab64->con_in_handle;
 480                 efi_systab.con_in = systab64->con_in;
 481                 tmp |= systab64->con_in;
 482                 efi_systab.con_out_handle = systab64->con_out_handle;
 483                 tmp |= systab64->con_out_handle;
 484                 efi_systab.con_out = systab64->con_out;
 485                 tmp |= systab64->con_out;
 486                 efi_systab.stderr_handle = systab64->stderr_handle;
 487                 tmp |= systab64->stderr_handle;
 488                 efi_systab.stderr = systab64->stderr;
 489                 tmp |= systab64->stderr;
 490                 efi_systab.runtime = (void *)(unsigned long)systab64->runtime;
 491                 tmp |= systab64->runtime;
 492                 efi_systab.boottime = (void *)(unsigned long)systab64->boottime;
 493                 tmp |= systab64->boottime;
 494                 efi_systab.nr_tables = systab64->nr_tables;
 495                 efi_systab.tables = systab64->tables;
 496                 tmp |= systab64->tables;
 497
 498                 early_iounmap(systab64, sizeof(*systab64));
 499 #ifdef CONFIG_X86_32
 500                 if (tmp >> 32) {
 501                         pr_err("EFI data located above 4GB, disabling EFI.\n");
 502                         return -EINVAL;
 503                 }
 504 #endif
 505         } else {
 506                 efi_system_table_32_t *systab32;
 507
 508                 systab32 = early_ioremap((unsigned long)phys,
 509                                          sizeof(*systab32));
 510                 if (systab32 == NULL) {
 511                         pr_err("Couldn't map the system table!\n");
 512                         return -ENOMEM;
 513                 }
 514
 515                 efi_systab.hdr = systab32->hdr;
 516                 efi_systab.fw_vendor = systab32->fw_vendor;
 517                 efi_systab.fw_revision = systab32->fw_revision;
 518                 efi_systab.con_in_handle = systab32->con_in_handle;
 519                 efi_systab.con_in = systab32->con_in;
 520                 efi_systab.con_out_handle = systab32->con_out_handle;
 521                 efi_systab.con_out = systab32->con_out;
 522                 efi_systab.stderr_handle = systab32->stderr_handle;
 523                 efi_systab.stderr = systab32->stderr;
 524                 efi_systab.runtime = (void *)(unsigned long)systab32->runtime;
 525                 efi_systab.boottime = (void *)(unsigned long)systab32->boottime;
 526                 efi_systab.nr_tables = systab32->nr_tables;
 527                 efi_systab.tables = systab32->tables;
 528
 529                 early_iounmap(systab32, sizeof(*systab32));
 530         }
 531
 532         efi.systab = &efi_systab;
 533
 534         /*
 535          * Verify the EFI Table
 536          */
 537         if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) {
 538                 pr_err("System table signature incorrect!\n");
 539                 return -EINVAL;
 540         }
 541         if ((efi.systab->hdr.revision >> 16) == 0)
 542                 pr_err("Warning: System table version "
 543                        "%d.%02d, expected 1.00 or greater!\n",
 544                        efi.systab->hdr.revision >> 16,
 545                        efi.systab->hdr.revision & 0xffff);
 546
 547         return 0;
 548 }
 549
 550 static int __init efi_config_init(u64 tables, int nr_tables)
 551 {
 552         void *config_tables, *tablep;
 553         int i, sz;
 554
 555         if (efi_64bit)
 556                 sz = sizeof(efi_config_table_64_t);
 557         else
 558                 sz = sizeof(efi_config_table_32_t);
 559
 560         /*
 561          * Let's see what config tables the firmware passed to us.
 562          */
 563         config_tables = early_ioremap(tables, nr_tables * sz);
 564         if (config_tables == NULL) {
 565                 pr_err("Could not map Configuration table!\n");
 566                 return -ENOMEM;
 567         }
 568
 569         tablep = config_tables;
 570         pr_info("");
 571         for (i = 0; i < efi.systab->nr_tables; i++) {
 572                 efi_guid_t guid;
 573                 unsigned long table;
 574
 575                 if (efi_64bit) {
 576                         u64 table64;
 577                         guid = ((efi_config_table_64_t *)tablep)->guid;
 578                         table64 = ((efi_config_table_64_t *)tablep)->table;
 579                         table = table64;
 580 #ifdef CONFIG_X86_32
 581                         if (table64 >> 32) {
 582                                 pr_cont("\n");
 583                                 pr_err("Table located above 4GB, disabling EFI.\n");
 584                                 early_iounmap(config_tables,
 585                                               efi.systab->nr_tables * sz);
 586                                 return -EINVAL;
 587                         }
 588 #endif
 589                 } else {
 590                         guid = ((efi_config_table_32_t *)tablep)->guid;
 591                         table = ((efi_config_table_32_t *)tablep)->table;
 592                 }
 593                 if (!efi_guidcmp(guid, MPS_TABLE_GUID)) {
 594                         efi.mps = table;
 595                         pr_cont(" MPS=0x%lx ", table);
 596                 } else if (!efi_guidcmp(guid, ACPI_20_TABLE_GUID)) {
 597                         efi.acpi20 = table;
 598                         pr_cont(" ACPI 2.0=0x%lx ", table);
 599                 } else if (!efi_guidcmp(guid, ACPI_TABLE_GUID)) {
 600                         efi.acpi = table;
 601                         pr_cont(" ACPI=0x%lx ", table);
 602                 } else if (!efi_guidcmp(guid, SMBIOS_TABLE_GUID)) {
 603                         efi.smbios = table;
 604                         pr_cont(" SMBIOS=0x%lx ", table);
 605 #ifdef CONFIG_X86_UV
 606                 } else if (!efi_guidcmp(guid, UV_SYSTEM_TABLE_GUID)) {
 607                         efi.uv_systab = table;
 608                         pr_cont(" UVsystab=0x%lx ", table);
 609 #endif
 610                 } else if (!efi_guidcmp(guid, HCDP_TABLE_GUID)) {
 611                         efi.hcdp = table;
 612                         pr_cont(" HCDP=0x%lx ", table);
 613                 } else if (!efi_guidcmp(guid, UGA_IO_PROTOCOL_GUID)) {
 614                         efi.uga = table;
 615                         pr_cont(" UGA=0x%lx ", table);
 616                 }
 617                 tablep += sz;
 618         }
 619         pr_cont("\n");
 620         early_iounmap(config_tables, efi.systab->nr_tables * sz);
 621         return 0;
 622 }
 623
 624 static int __init efi_runtime_init(void)
 625 {
 626         efi_runtime_services_t *runtime;
 627
 628         /*
 629          * Check out the runtime services table. We need to map
 630          * the runtime services table so that we can grab the physical
 631          * address of several of the EFI runtime functions, needed to
 632          * set the firmware into virtual mode.
 633          */
 634         runtime = early_ioremap((unsigned long)efi.systab->runtime,
 635                                 sizeof(efi_runtime_services_t));
 636         if (!runtime) {
 637                 pr_err("Could not map the runtime service table!\n");
 638                 return -ENOMEM;
 639         }
 640         /*
 641          * We will only need *early* access to the following
 642          * two EFI runtime services before set_virtual_address_map
 643          * is invoked.
 644          */
 645         efi_phys.get_time = (efi_get_time_t *)runtime->get_time;
 646         efi_phys.set_virtual_address_map =
 647                 (efi_set_virtual_address_map_t *)
 648                 runtime->set_virtual_address_map;
 649         /*
 650          * Make efi_get_time can be called before entering
 651          * virtual mode.
 652          */
 653         efi.get_time = phys_efi_get_time;
 654         early_iounmap(runtime, sizeof(efi_runtime_services_t));
 655
 656         return 0;
 657 }
 658
 659 static int __init efi_memmap_init(void)
 660 {
 661         /* Map the EFI memory map */
 662         memmap.map = early_ioremap((unsigned long)memmap.phys_map,
 663                                    memmap.nr_map * memmap.desc_size);
 664         if (memmap.map == NULL) {
 665                 pr_err("Could not map the memory map!\n");
 666                 return -ENOMEM;
 667         }
 668         memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
 669
 670         if (add_efi_memmap)
 671                 do_add_efi_memmap();
 672
 673         return 0;
 674 }
 675
 676 void __init efi_init(void)
 677 {
 678         efi_char16_t *c16;
 679         char vendor[100] = "unknown";
 680         int i = 0;
 681         void *tmp;
 682
 683 #ifdef CONFIG_X86_32
 684         if (boot_params.efi_info.efi_systab_hi ||
 685             boot_params.efi_info.efi_memmap_hi) {
 686                 pr_info("Table located above 4GB, disabling EFI.\n");
 687                 efi_enabled = 0;
 688                 return;
 689         }
 690         efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab;
 691 #else
 692         efi_phys.systab = (efi_system_table_t *)
 693                           (boot_params.efi_info.efi_systab |
 694                           ((__u64)boot_params.efi_info.efi_systab_hi<<32));
 695 #endif
 696
 697         if (efi_systab_init(efi_phys.systab)) {
 698                 efi_enabled = 0;
 699                 return;
 700         }
 701
 702         /*
 703          * Show what we know for posterity
 704          */
 705         c16 = tmp = early_ioremap(efi.systab->fw_vendor, 2);
 706         if (c16) {
 707                 for (i = 0; i < sizeof(vendor) - 1 && *c16; ++i)
 708                         vendor[i] = *c16++;
 709                 vendor[i] = '\0';
 710         } else
 711                 pr_err("Could not map the firmware vendor!\n");
 712         early_iounmap(tmp, 2);
 713
 714         pr_info("EFI v%u.%.02u by %s\n",
 715                 efi.systab->hdr.revision >> 16,
 716                 efi.systab->hdr.revision & 0xffff, vendor);
 717
 718         if (efi_config_init(efi.systab->tables, efi.systab->nr_tables)) {
 719                 efi_enabled = 0;
 720                 return;
 721         }
 722
 723         /*
 724          * Note: We currently don't support runtime services on an EFI
 725          * that doesn't match the kernel 32/64-bit mode.
 726          */
 727
 728         if (!efi_is_native())
 729                 pr_info("No EFI runtime due to 32/64-bit mismatch with kernel\n");
 730         else if (efi_runtime_init()) {
 731                 efi_enabled = 0;
 732                 return;
 733         }
 734
 735         if (efi_memmap_init()) {
 736                 efi_enabled = 0;
 737                 return;
 738         }
 739 #ifdef CONFIG_X86_32
 740         if (efi_is_native()) {
 741                 x86_platform.get_wallclock = efi_get_time;
 742                 x86_platform.set_wallclock = efi_set_rtc_mmss;
 743         }
 744 #endif
 745
 746 #if EFI_DEBUG
 747         print_efi_memmap();
 748 #endif
 749 }
 750
 751 void __init efi_late_init(void)
 752 {
 753         efi_bgrt_init();
 754 }
 755
 756 void __init efi_set_executable(efi_memory_desc_t *md, bool executable)
 757 {
 758         u64 addr, npages;
 759
 760         addr = md->virt_addr;
 761         npages = md->num_pages;
 762
 763         memrange_efi_to_native(&addr, &npages);
 764
 765         if (executable)
 766                 set_memory_x(addr, npages);
 767         else
 768                 set_memory_nx(addr, npages);
 769 }
 770
 771 static void __init runtime_code_page_mkexec(void)
 772 {
 773         efi_memory_desc_t *md;
 774         void *p;
 775
 776         /* Make EFI runtime service code area executable */
 777         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 778                 md = p;
 779
 780                 if (md->type != EFI_RUNTIME_SERVICES_CODE)
 781                         continue;
 782
 783                 efi_set_executable(md, true);
 784         }
 785 }
 786
 787 /*
 788  * We can't ioremap data in EFI boot services RAM, because we've already mapped
 789  * it as RAM.  So, look it up in the existing EFI memory map instead.  Only
 790  * callable after efi_enter_virtual_mode and before efi_free_boot_services.
 791  */
 792 void __iomem *efi_lookup_mapped_addr(u64 phys_addr)
 793 {
 794         void *p;
 795         if (WARN_ON(!memmap.map))
 796                 return NULL;
 797         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 798                 efi_memory_desc_t *md = p;
 799                 u64 size = md->num_pages << EFI_PAGE_SHIFT;
 800                 u64 end = md->phys_addr + size;
 801                 if (!(md->attribute & EFI_MEMORY_RUNTIME) &&
 802                     md->type != EFI_BOOT_SERVICES_CODE &&
 803                     md->type != EFI_BOOT_SERVICES_DATA)
 804                         continue;
 805                 if (!md->virt_addr)
 806                         continue;
 807                 if (phys_addr >= md->phys_addr && phys_addr < end) {
 808                         phys_addr += md->virt_addr - md->phys_addr;
 809                         return (__force void __iomem *)(unsigned long)phys_addr;
 810                 }
 811         }
 812         return NULL;
 813 }
 814
 815 void efi_memory_uc(u64 addr, unsigned long size)
 816 {
 817         unsigned long page_shift = 1UL << EFI_PAGE_SHIFT;
 818         u64 npages;
 819
 820         npages = round_up(size, page_shift) / page_shift;
 821         memrange_efi_to_native(&addr, &npages);
 822         set_memory_uc(addr, npages);
 823 }
 824
 825 /*
 826  * This function will switch the EFI runtime services to virtual mode.
 827  * Essentially, look through the EFI memmap and map every region that
 828  * has the runtime attribute bit set in its memory descriptor and update
 829  * that memory descriptor with the virtual address obtained from ioremap().
 830  * This enables the runtime services to be called without having to
 831  * thunk back into physical mode for every invocation.
 832  */
 833 void __init efi_enter_virtual_mode(void)
 834 {
 835         efi_memory_desc_t *md, *prev_md = NULL;
 836         efi_status_t status;
 837         unsigned long size;
 838         u64 end, systab, end_pfn;
 839         void *p, *va, *new_memmap = NULL;
 840         int count = 0;
 841
 842         efi.systab = NULL;
 843
 844         /*
 845          * We don't do virtual mode, since we don't do runtime services, on
 846          * non-native EFI
 847          */
 848
 849         if (!efi_is_native()) {
 850                 efi_unmap_memmap();
 851                 return;
 852         }
 853
 854         /* Merge contiguous regions of the same type and attribute */
 855         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 856                 u64 prev_size;
 857                 md = p;
 858
 859                 if (!prev_md) {
 860                         prev_md = md;
 861                         continue;
 862                 }
 863
 864                 if (prev_md->type != md->type ||
 865                     prev_md->attribute != md->attribute) {
 866                         prev_md = md;
 867                         continue;
 868                 }
 869
 870                 prev_size = prev_md->num_pages << EFI_PAGE_SHIFT;
 871
 872                 if (md->phys_addr == (prev_md->phys_addr + prev_size)) {
 873                         prev_md->num_pages += md->num_pages;
 874                         md->type = EFI_RESERVED_TYPE;
 875                         md->attribute = 0;
 876                         continue;
 877                 }
 878                 prev_md = md;
 879         }
 880
 881         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 882                 md = p;
 883                 if (!(md->attribute & EFI_MEMORY_RUNTIME) &&
 884                     md->type != EFI_BOOT_SERVICES_CODE &&
 885                     md->type != EFI_BOOT_SERVICES_DATA)
 886                         continue;
 887
 888                 size = md->num_pages << EFI_PAGE_SHIFT;
 889                 end = md->phys_addr + size;
 890
 891                 end_pfn = PFN_UP(end);
 892                 if (end_pfn <= max_low_pfn_mapped
 893                     || (end_pfn > (1UL << (32 - PAGE_SHIFT))
 894                         && end_pfn <= max_pfn_mapped)) {
 895                         va = __va(md->phys_addr);
 896
 897                         if (!(md->attribute & EFI_MEMORY_WB))
 898                                 efi_memory_uc((u64)(unsigned long)va, size);
 899                 } else
 900                         va = efi_ioremap(md->phys_addr, size,
 901                                          md->type, md->attribute);
 902
 903                 md->virt_addr = (u64) (unsigned long) va;
 904
 905                 if (!va) {
 906                         pr_err("ioremap of 0x%llX failed!\n",
 907                                (unsigned long long)md->phys_addr);
 908                         continue;
 909                 }
 910
 911                 systab = (u64) (unsigned long) efi_phys.systab;
 912                 if (md->phys_addr <= systab && systab < end) {
 913                         systab += md->virt_addr - md->phys_addr;
 914                         efi.systab = (efi_system_table_t *) (unsigned long) systab;
 915                 }
 916                 new_memmap = krealloc(new_memmap,
 917                                       (count + 1) * memmap.desc_size,
 918                                       GFP_KERNEL);
 919                 memcpy(new_memmap + (count * memmap.desc_size), md,
 920                        memmap.desc_size);
 921                 count++;
 922         }
 923
 924         BUG_ON(!efi.systab);
 925
 926         status = phys_efi_set_virtual_address_map(
 927                 memmap.desc_size * count,
 928                 memmap.desc_size,
 929                 memmap.desc_version,
 930                 (efi_memory_desc_t *)__pa(new_memmap));
 931
 932         if (status != EFI_SUCCESS) {
 933                 pr_alert("Unable to switch EFI into virtual mode "
 934                          "(status=%lx)!\n", status);
 935                 panic("EFI call to SetVirtualAddressMap() failed!");
 936         }
 937
 938         /*
 939          * Now that EFI is in virtual mode, update the function
 940          * pointers in the runtime service table to the new virtual addresses.
 941          *
 942          * Call EFI services through wrapper functions.
 943          */
 944         efi.runtime_version = efi_systab.fw_revision;
 945         efi.get_time = virt_efi_get_time;
 946         efi.set_time = virt_efi_set_time;
 947         efi.get_wakeup_time = virt_efi_get_wakeup_time;
 948         efi.set_wakeup_time = virt_efi_set_wakeup_time;
 949         efi.get_variable = virt_efi_get_variable;
 950         efi.get_next_variable = virt_efi_get_next_variable;
 951         efi.set_variable = virt_efi_set_variable;
 952         efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count;
 953         efi.reset_system = virt_efi_reset_system;
 954         efi.set_virtual_address_map = NULL;
 955         efi.query_variable_info = virt_efi_query_variable_info;
 956         efi.update_capsule = virt_efi_update_capsule;
 957         efi.query_capsule_caps = virt_efi_query_capsule_caps;
 958         if (__supported_pte_mask & _PAGE_NX)
 959                 runtime_code_page_mkexec();
 960
 961         kfree(new_memmap);
 962 }
 963
 964 /*
 965  * Convenience functions to obtain memory types and attributes
 966  */
 967 u32 efi_mem_type(unsigned long phys_addr)
 968 {
 969         efi_memory_desc_t *md;
 970         void *p;
 971
 972         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 973                 md = p;
 974                 if ((md->phys_addr <= phys_addr) &&
 975                     (phys_addr < (md->phys_addr +
 976                                   (md->num_pages << EFI_PAGE_SHIFT))))
 977                         return md->type;
 978         }
 979         return 0;
 980 }
 981
 982 u64 efi_mem_attributes(unsigned long phys_addr)
 983 {
 984         efi_memory_desc_t *md;
 985         void *p;
 986
 987         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 988                 md = p;
 989                 if ((md->phys_addr <= phys_addr) &&
 990                     (phys_addr < (md->phys_addr +
 991                                   (md->num_pages << EFI_PAGE_SHIFT))))
 992                         return md->attribute;
 993         }
 994         return 0;
 995 }