Pileus Git - ~andy/linux/blob - 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 #include <asm/rtc.h>
  52
  53 #define EFI_DEBUG       1
  54
  55 struct efi __read_mostly efi = {
  56         .mps        = EFI_INVALID_TABLE_ADDR,
  57         .acpi       = EFI_INVALID_TABLE_ADDR,
  58         .acpi20     = EFI_INVALID_TABLE_ADDR,
  59         .smbios     = EFI_INVALID_TABLE_ADDR,
  60         .sal_systab = EFI_INVALID_TABLE_ADDR,
  61         .boot_info  = EFI_INVALID_TABLE_ADDR,
  62         .hcdp       = EFI_INVALID_TABLE_ADDR,
  63         .uga        = EFI_INVALID_TABLE_ADDR,
  64         .uv_systab  = EFI_INVALID_TABLE_ADDR,
  65 };
  66 EXPORT_SYMBOL(efi);
  67
  68 struct efi_memory_map memmap;
  69
  70 static struct efi efi_phys __initdata;
  71 static efi_system_table_t efi_systab __initdata;
  72
  73 unsigned long x86_efi_facility;
  74
  75 /*
  76  * Returns 1 if 'facility' is enabled, 0 otherwise.
  77  */
  78 int efi_enabled(int facility)
  79 {
  80         return test_bit(facility, &x86_efi_facility) != 0;
  81 }
  82 EXPORT_SYMBOL(efi_enabled);
  83
  84 static bool __initdata disable_runtime = false;
  85 static int __init setup_noefi(char *arg)
  86 {
  87         disable_runtime = true;
  88         return 0;
  89 }
  90 early_param("noefi", setup_noefi);
  91
  92 int add_efi_memmap;
  93 EXPORT_SYMBOL(add_efi_memmap);
  94
  95 static int __init setup_add_efi_memmap(char *arg)
  96 {
  97         add_efi_memmap = 1;
  98         return 0;
  99 }
 100 early_param("add_efi_memmap", setup_add_efi_memmap);
 101
 102
 103 static efi_status_t virt_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
 104 {
 105         unsigned long flags;
 106         efi_status_t status;
 107
 108         spin_lock_irqsave(&rtc_lock, flags);
 109         status = efi_call_virt2(get_time, tm, tc);
 110         spin_unlock_irqrestore(&rtc_lock, flags);
 111         return status;
 112 }
 113
 114 static efi_status_t virt_efi_set_time(efi_time_t *tm)
 115 {
 116         unsigned long flags;
 117         efi_status_t status;
 118
 119         spin_lock_irqsave(&rtc_lock, flags);
 120         status = efi_call_virt1(set_time, tm);
 121         spin_unlock_irqrestore(&rtc_lock, flags);
 122         return status;
 123 }
 124
 125 static efi_status_t virt_efi_get_wakeup_time(efi_bool_t *enabled,
 126                                              efi_bool_t *pending,
 127                                              efi_time_t *tm)
 128 {
 129         unsigned long flags;
 130         efi_status_t status;
 131
 132         spin_lock_irqsave(&rtc_lock, flags);
 133         status = efi_call_virt3(get_wakeup_time,
 134                                 enabled, pending, tm);
 135         spin_unlock_irqrestore(&rtc_lock, flags);
 136         return status;
 137 }
 138
 139 static efi_status_t virt_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
 140 {
 141         unsigned long flags;
 142         efi_status_t status;
 143
 144         spin_lock_irqsave(&rtc_lock, flags);
 145         status = efi_call_virt2(set_wakeup_time,
 146                                 enabled, tm);
 147         spin_unlock_irqrestore(&rtc_lock, flags);
 148         return status;
 149 }
 150
 151 static efi_status_t virt_efi_get_variable(efi_char16_t *name,
 152                                           efi_guid_t *vendor,
 153                                           u32 *attr,
 154                                           unsigned long *data_size,
 155                                           void *data)
 156 {
 157         return efi_call_virt5(get_variable,
 158                               name, vendor, attr,
 159                               data_size, data);
 160 }
 161
 162 static efi_status_t virt_efi_get_next_variable(unsigned long *name_size,
 163                                                efi_char16_t *name,
 164                                                efi_guid_t *vendor)
 165 {
 166         return efi_call_virt3(get_next_variable,
 167                               name_size, name, vendor);
 168 }
 169
 170 static efi_status_t virt_efi_set_variable(efi_char16_t *name,
 171                                           efi_guid_t *vendor,
 172                                           u32 attr,
 173                                           unsigned long data_size,
 174                                           void *data)
 175 {
 176         return efi_call_virt5(set_variable,
 177                               name, vendor, attr,
 178                               data_size, data);
 179 }
 180
 181 static efi_status_t virt_efi_query_variable_info(u32 attr,
 182                                                  u64 *storage_space,
 183                                                  u64 *remaining_space,
 184                                                  u64 *max_variable_size)
 185 {
 186         if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
 187                 return EFI_UNSUPPORTED;
 188
 189         return efi_call_virt4(query_variable_info, attr, storage_space,
 190                               remaining_space, max_variable_size);
 191 }
 192
 193 static efi_status_t virt_efi_get_next_high_mono_count(u32 *count)
 194 {
 195         return efi_call_virt1(get_next_high_mono_count, count);
 196 }
 197
 198 static void virt_efi_reset_system(int reset_type,
 199                                   efi_status_t status,
 200                                   unsigned long data_size,
 201                                   efi_char16_t *data)
 202 {
 203         efi_call_virt4(reset_system, reset_type, status,
 204                        data_size, data);
 205 }
 206
 207 static efi_status_t virt_efi_update_capsule(efi_capsule_header_t **capsules,
 208                                             unsigned long count,
 209                                             unsigned long sg_list)
 210 {
 211         if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
 212                 return EFI_UNSUPPORTED;
 213
 214         return efi_call_virt3(update_capsule, capsules, count, sg_list);
 215 }
 216
 217 static efi_status_t virt_efi_query_capsule_caps(efi_capsule_header_t **capsules,
 218                                                 unsigned long count,
 219                                                 u64 *max_size,
 220                                                 int *reset_type)
 221 {
 222         if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
 223                 return EFI_UNSUPPORTED;
 224
 225         return efi_call_virt4(query_capsule_caps, capsules, count, max_size,
 226                               reset_type);
 227 }
 228
 229 static efi_status_t __init phys_efi_set_virtual_address_map(
 230         unsigned long memory_map_size,
 231         unsigned long descriptor_size,
 232         u32 descriptor_version,
 233         efi_memory_desc_t *virtual_map)
 234 {
 235         efi_status_t status;
 236
 237         efi_call_phys_prelog();
 238         status = efi_call_phys4(efi_phys.set_virtual_address_map,
 239                                 memory_map_size, descriptor_size,
 240                                 descriptor_version, virtual_map);
 241         efi_call_phys_epilog();
 242         return status;
 243 }
 244
 245 static efi_status_t __init phys_efi_get_time(efi_time_t *tm,
 246                                              efi_time_cap_t *tc)
 247 {
 248         unsigned long flags;
 249         efi_status_t status;
 250
 251         spin_lock_irqsave(&rtc_lock, flags);
 252         efi_call_phys_prelog();
 253         status = efi_call_phys2(efi_phys.get_time, virt_to_phys(tm),
 254                                 virt_to_phys(tc));
 255         efi_call_phys_epilog();
 256         spin_unlock_irqrestore(&rtc_lock, flags);
 257         return status;
 258 }
 259
 260 int efi_set_rtc_mmss(unsigned long nowtime)
 261 {
 262         efi_status_t    status;
 263         efi_time_t      eft;
 264         efi_time_cap_t  cap;
 265         struct rtc_time tm;
 266
 267         status = efi.get_time(&eft, &cap);
 268         if (status != EFI_SUCCESS) {
 269                 pr_err("Oops: efitime: can't read time!\n");
 270                 return -1;
 271         }
 272
 273         rtc_time_to_tm(nowtime, &tm);
 274         if (!rtc_valid_tm(&tm)) {
 275                 eft.year = tm.tm_year + 1900;
 276                 eft.month = tm.tm_mon + 1;
 277                 eft.day = tm.tm_mday;
 278                 eft.minute = tm.tm_min;
 279                 eft.second = tm.tm_sec;
 280                 eft.nanosecond = 0;
 281         } else {
 282                 printk(KERN_ERR
 283                        "%s: Invalid EFI RTC value: write of %lx to EFI RTC failed\n",
 284                        __FUNCTION__, nowtime);
 285                 return -1;
 286         }
 287
 288         status = efi.set_time(&eft);
 289         if (status != EFI_SUCCESS) {
 290                 pr_err("Oops: efitime: can't write time!\n");
 291                 return -1;
 292         }
 293         return 0;
 294 }
 295
 296 unsigned long efi_get_time(void)
 297 {
 298         efi_status_t status;
 299         efi_time_t eft;
 300         efi_time_cap_t cap;
 301
 302         status = efi.get_time(&eft, &cap);
 303         if (status != EFI_SUCCESS)
 304                 pr_err("Oops: efitime: can't read time!\n");
 305
 306         return mktime(eft.year, eft.month, eft.day, eft.hour,
 307                       eft.minute, eft.second);
 308 }
 309
 310 /*
 311  * Tell the kernel about the EFI memory map.  This might include
 312  * more than the max 128 entries that can fit in the e820 legacy
 313  * (zeropage) memory map.
 314  */
 315
 316 static void __init do_add_efi_memmap(void)
 317 {
 318         void *p;
 319
 320         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 321                 efi_memory_desc_t *md = p;
 322                 unsigned long long start = md->phys_addr;
 323                 unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
 324                 int e820_type;
 325
 326                 switch (md->type) {
 327                 case EFI_LOADER_CODE:
 328                 case EFI_LOADER_DATA:
 329                 case EFI_BOOT_SERVICES_CODE:
 330                 case EFI_BOOT_SERVICES_DATA:
 331                 case EFI_CONVENTIONAL_MEMORY:
 332                         if (md->attribute & EFI_MEMORY_WB)
 333                                 e820_type = E820_RAM;
 334                         else
 335                                 e820_type = E820_RESERVED;
 336                         break;
 337                 case EFI_ACPI_RECLAIM_MEMORY:
 338                         e820_type = E820_ACPI;
 339                         break;
 340                 case EFI_ACPI_MEMORY_NVS:
 341                         e820_type = E820_NVS;
 342                         break;
 343                 case EFI_UNUSABLE_MEMORY:
 344                         e820_type = E820_UNUSABLE;
 345                         break;
 346                 default:
 347                         /*
 348                          * EFI_RESERVED_TYPE EFI_RUNTIME_SERVICES_CODE
 349                          * EFI_RUNTIME_SERVICES_DATA EFI_MEMORY_MAPPED_IO
 350                          * EFI_MEMORY_MAPPED_IO_PORT_SPACE EFI_PAL_CODE
 351                          */
 352                         e820_type = E820_RESERVED;
 353                         break;
 354                 }
 355                 e820_add_region(start, size, e820_type);
 356         }
 357         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 358 }
 359
 360 int __init efi_memblock_x86_reserve_range(void)
 361 {
 362         unsigned long pmap;
 363
 364 #ifdef CONFIG_X86_32
 365         /* Can't handle data above 4GB at this time */
 366         if (boot_params.efi_info.efi_memmap_hi) {
 367                 pr_err("Memory map is above 4GB, disabling EFI.\n");
 368                 return -EINVAL;
 369         }
 370         pmap = boot_params.efi_info.efi_memmap;
 371 #else
 372         pmap = (boot_params.efi_info.efi_memmap |
 373                 ((__u64)boot_params.efi_info.efi_memmap_hi<<32));
 374 #endif
 375         memmap.phys_map = (void *)pmap;
 376         memmap.nr_map = boot_params.efi_info.efi_memmap_size /
 377                 boot_params.efi_info.efi_memdesc_size;
 378         memmap.desc_version = boot_params.efi_info.efi_memdesc_version;
 379         memmap.desc_size = boot_params.efi_info.efi_memdesc_size;
 380         memblock_reserve(pmap, memmap.nr_map * memmap.desc_size);
 381
 382         return 0;
 383 }
 384
 385 #if EFI_DEBUG
 386 static void __init print_efi_memmap(void)
 387 {
 388         efi_memory_desc_t *md;
 389         void *p;
 390         int i;
 391
 392         for (p = memmap.map, i = 0;
 393              p < memmap.map_end;
 394              p += memmap.desc_size, i++) {
 395                 md = p;
 396                 pr_info("mem%02u: type=%u, attr=0x%llx, "
 397                         "range=[0x%016llx-0x%016llx) (%lluMB)\n",
 398                         i, md->type, md->attribute, md->phys_addr,
 399                         md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
 400                         (md->num_pages >> (20 - EFI_PAGE_SHIFT)));
 401         }
 402 }
 403 #endif  /*  EFI_DEBUG  */
 404
 405 void __init efi_reserve_boot_services(void)
 406 {
 407         void *p;
 408
 409         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 410                 efi_memory_desc_t *md = p;
 411                 u64 start = md->phys_addr;
 412                 u64 size = md->num_pages << EFI_PAGE_SHIFT;
 413
 414                 if (md->type != EFI_BOOT_SERVICES_CODE &&
 415                     md->type != EFI_BOOT_SERVICES_DATA)
 416                         continue;
 417                 /* Only reserve where possible:
 418                  * - Not within any already allocated areas
 419                  * - Not over any memory area (really needed, if above?)
 420                  * - Not within any part of the kernel
 421                  * - Not the bios reserved area
 422                 */
 423                 if ((start+size >= __pa_symbol(_text)
 424                                 && start <= __pa_symbol(_end)) ||
 425                         !e820_all_mapped(start, start+size, E820_RAM) ||
 426                         memblock_is_region_reserved(start, size)) {
 427                         /* Could not reserve, skip it */
 428                         md->num_pages = 0;
 429                         memblock_dbg("Could not reserve boot range "
 430                                         "[0x%010llx-0x%010llx]\n",
 431                                                 start, start+size-1);
 432                 } else
 433                         memblock_reserve(start, size);
 434         }
 435 }
 436
 437 void __init efi_unmap_memmap(void)
 438 {
 439         clear_bit(EFI_MEMMAP, &x86_efi_facility);
 440         if (memmap.map) {
 441                 early_iounmap(memmap.map, memmap.nr_map * memmap.desc_size);
 442                 memmap.map = NULL;
 443         }
 444 }
 445
 446 void __init efi_free_boot_services(void)
 447 {
 448         void *p;
 449
 450         if (!efi_is_native())
 451                 return;
 452
 453         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 454                 efi_memory_desc_t *md = p;
 455                 unsigned long long start = md->phys_addr;
 456                 unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
 457
 458                 if (md->type != EFI_BOOT_SERVICES_CODE &&
 459                     md->type != EFI_BOOT_SERVICES_DATA)
 460                         continue;
 461
 462                 /* Could not reserve boot area */
 463                 if (!size)
 464                         continue;
 465
 466                 free_bootmem_late(start, size);
 467         }
 468
 469         efi_unmap_memmap();
 470 }
 471
 472 static int __init efi_systab_init(void *phys)
 473 {
 474         if (efi_enabled(EFI_64BIT)) {
 475                 efi_system_table_64_t *systab64;
 476                 u64 tmp = 0;
 477
 478                 systab64 = early_ioremap((unsigned long)phys,
 479                                          sizeof(*systab64));
 480                 if (systab64 == NULL) {
 481                         pr_err("Couldn't map the system table!\n");
 482                         return -ENOMEM;
 483                 }
 484
 485                 efi_systab.hdr = systab64->hdr;
 486                 efi_systab.fw_vendor = systab64->fw_vendor;
 487                 tmp |= systab64->fw_vendor;
 488                 efi_systab.fw_revision = systab64->fw_revision;
 489                 efi_systab.con_in_handle = systab64->con_in_handle;
 490                 tmp |= systab64->con_in_handle;
 491                 efi_systab.con_in = systab64->con_in;
 492                 tmp |= systab64->con_in;
 493                 efi_systab.con_out_handle = systab64->con_out_handle;
 494                 tmp |= systab64->con_out_handle;
 495                 efi_systab.con_out = systab64->con_out;
 496                 tmp |= systab64->con_out;
 497                 efi_systab.stderr_handle = systab64->stderr_handle;
 498                 tmp |= systab64->stderr_handle;
 499                 efi_systab.stderr = systab64->stderr;
 500                 tmp |= systab64->stderr;
 501                 efi_systab.runtime = (void *)(unsigned long)systab64->runtime;
 502                 tmp |= systab64->runtime;
 503                 efi_systab.boottime = (void *)(unsigned long)systab64->boottime;
 504                 tmp |= systab64->boottime;
 505                 efi_systab.nr_tables = systab64->nr_tables;
 506                 efi_systab.tables = systab64->tables;
 507                 tmp |= systab64->tables;
 508
 509                 early_iounmap(systab64, sizeof(*systab64));
 510 #ifdef CONFIG_X86_32
 511                 if (tmp >> 32) {
 512                         pr_err("EFI data located above 4GB, disabling EFI.\n");
 513                         return -EINVAL;
 514                 }
 515 #endif
 516         } else {
 517                 efi_system_table_32_t *systab32;
 518
 519                 systab32 = early_ioremap((unsigned long)phys,
 520                                          sizeof(*systab32));
 521                 if (systab32 == NULL) {
 522                         pr_err("Couldn't map the system table!\n");
 523                         return -ENOMEM;
 524                 }
 525
 526                 efi_systab.hdr = systab32->hdr;
 527                 efi_systab.fw_vendor = systab32->fw_vendor;
 528                 efi_systab.fw_revision = systab32->fw_revision;
 529                 efi_systab.con_in_handle = systab32->con_in_handle;
 530                 efi_systab.con_in = systab32->con_in;
 531                 efi_systab.con_out_handle = systab32->con_out_handle;
 532                 efi_systab.con_out = systab32->con_out;
 533                 efi_systab.stderr_handle = systab32->stderr_handle;
 534                 efi_systab.stderr = systab32->stderr;
 535                 efi_systab.runtime = (void *)(unsigned long)systab32->runtime;
 536                 efi_systab.boottime = (void *)(unsigned long)systab32->boottime;
 537                 efi_systab.nr_tables = systab32->nr_tables;
 538                 efi_systab.tables = systab32->tables;
 539
 540                 early_iounmap(systab32, sizeof(*systab32));
 541         }
 542
 543         efi.systab = &efi_systab;
 544
 545         /*
 546          * Verify the EFI Table
 547          */
 548         if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) {
 549                 pr_err("System table signature incorrect!\n");
 550                 return -EINVAL;
 551         }
 552         if ((efi.systab->hdr.revision >> 16) == 0)
 553                 pr_err("Warning: System table version "
 554                        "%d.%02d, expected 1.00 or greater!\n",
 555                        efi.systab->hdr.revision >> 16,
 556                        efi.systab->hdr.revision & 0xffff);
 557
 558         return 0;
 559 }
 560
 561 static int __init efi_config_init(u64 tables, int nr_tables)
 562 {
 563         void *config_tables, *tablep;
 564         int i, sz;
 565
 566         if (efi_enabled(EFI_64BIT))
 567                 sz = sizeof(efi_config_table_64_t);
 568         else
 569                 sz = sizeof(efi_config_table_32_t);
 570
 571         /*
 572          * Let's see what config tables the firmware passed to us.
 573          */
 574         config_tables = early_ioremap(tables, nr_tables * sz);
 575         if (config_tables == NULL) {
 576                 pr_err("Could not map Configuration table!\n");
 577                 return -ENOMEM;
 578         }
 579
 580         tablep = config_tables;
 581         pr_info("");
 582         for (i = 0; i < efi.systab->nr_tables; i++) {
 583                 efi_guid_t guid;
 584                 unsigned long table;
 585
 586                 if (efi_enabled(EFI_64BIT)) {
 587                         u64 table64;
 588                         guid = ((efi_config_table_64_t *)tablep)->guid;
 589                         table64 = ((efi_config_table_64_t *)tablep)->table;
 590                         table = table64;
 591 #ifdef CONFIG_X86_32
 592                         if (table64 >> 32) {
 593                                 pr_cont("\n");
 594                                 pr_err("Table located above 4GB, disabling EFI.\n");
 595                                 early_iounmap(config_tables,
 596                                               efi.systab->nr_tables * sz);
 597                                 return -EINVAL;
 598                         }
 599 #endif
 600                 } else {
 601                         guid = ((efi_config_table_32_t *)tablep)->guid;
 602                         table = ((efi_config_table_32_t *)tablep)->table;
 603                 }
 604                 if (!efi_guidcmp(guid, MPS_TABLE_GUID)) {
 605                         efi.mps = table;
 606                         pr_cont(" MPS=0x%lx ", table);
 607                 } else if (!efi_guidcmp(guid, ACPI_20_TABLE_GUID)) {
 608                         efi.acpi20 = table;
 609                         pr_cont(" ACPI 2.0=0x%lx ", table);
 610                 } else if (!efi_guidcmp(guid, ACPI_TABLE_GUID)) {
 611                         efi.acpi = table;
 612                         pr_cont(" ACPI=0x%lx ", table);
 613                 } else if (!efi_guidcmp(guid, SMBIOS_TABLE_GUID)) {
 614                         efi.smbios = table;
 615                         pr_cont(" SMBIOS=0x%lx ", table);
 616 #ifdef CONFIG_X86_UV
 617                 } else if (!efi_guidcmp(guid, UV_SYSTEM_TABLE_GUID)) {
 618                         efi.uv_systab = table;
 619                         pr_cont(" UVsystab=0x%lx ", table);
 620 #endif
 621                 } else if (!efi_guidcmp(guid, HCDP_TABLE_GUID)) {
 622                         efi.hcdp = table;
 623                         pr_cont(" HCDP=0x%lx ", table);
 624                 } else if (!efi_guidcmp(guid, UGA_IO_PROTOCOL_GUID)) {
 625                         efi.uga = table;
 626                         pr_cont(" UGA=0x%lx ", table);
 627                 }
 628                 tablep += sz;
 629         }
 630         pr_cont("\n");
 631         early_iounmap(config_tables, efi.systab->nr_tables * sz);
 632         return 0;
 633 }
 634
 635 static int __init efi_runtime_init(void)
 636 {
 637         efi_runtime_services_t *runtime;
 638
 639         /*
 640          * Check out the runtime services table. We need to map
 641          * the runtime services table so that we can grab the physical
 642          * address of several of the EFI runtime functions, needed to
 643          * set the firmware into virtual mode.
 644          */
 645         runtime = early_ioremap((unsigned long)efi.systab->runtime,
 646                                 sizeof(efi_runtime_services_t));
 647         if (!runtime) {
 648                 pr_err("Could not map the runtime service table!\n");
 649                 return -ENOMEM;
 650         }
 651         /*
 652          * We will only need *early* access to the following
 653          * two EFI runtime services before set_virtual_address_map
 654          * is invoked.
 655          */
 656         efi_phys.get_time = (efi_get_time_t *)runtime->get_time;
 657         efi_phys.set_virtual_address_map =
 658                 (efi_set_virtual_address_map_t *)
 659                 runtime->set_virtual_address_map;
 660         /*
 661          * Make efi_get_time can be called before entering
 662          * virtual mode.
 663          */
 664         efi.get_time = phys_efi_get_time;
 665         early_iounmap(runtime, sizeof(efi_runtime_services_t));
 666
 667         return 0;
 668 }
 669
 670 static int __init efi_memmap_init(void)
 671 {
 672         /* Map the EFI memory map */
 673         memmap.map = early_ioremap((unsigned long)memmap.phys_map,
 674                                    memmap.nr_map * memmap.desc_size);
 675         if (memmap.map == NULL) {
 676                 pr_err("Could not map the memory map!\n");
 677                 return -ENOMEM;
 678         }
 679         memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
 680
 681         if (add_efi_memmap)
 682                 do_add_efi_memmap();
 683
 684         return 0;
 685 }
 686
 687 void __init efi_init(void)
 688 {
 689         efi_char16_t *c16;
 690         char vendor[100] = "unknown";
 691         int i = 0;
 692         void *tmp;
 693
 694 #ifdef CONFIG_X86_32
 695         if (boot_params.efi_info.efi_systab_hi ||
 696             boot_params.efi_info.efi_memmap_hi) {
 697                 pr_info("Table located above 4GB, disabling EFI.\n");
 698                 return;
 699         }
 700         efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab;
 701 #else
 702         efi_phys.systab = (efi_system_table_t *)
 703                           (boot_params.efi_info.efi_systab |
 704                           ((__u64)boot_params.efi_info.efi_systab_hi<<32));
 705 #endif
 706
 707         if (efi_systab_init(efi_phys.systab))
 708                 return;
 709
 710         set_bit(EFI_SYSTEM_TABLES, &x86_efi_facility);
 711
 712         /*
 713          * Show what we know for posterity
 714          */
 715         c16 = tmp = early_ioremap(efi.systab->fw_vendor, 2);
 716         if (c16) {
 717                 for (i = 0; i < sizeof(vendor) - 1 && *c16; ++i)
 718                         vendor[i] = *c16++;
 719                 vendor[i] = '\0';
 720         } else
 721                 pr_err("Could not map the firmware vendor!\n");
 722         early_iounmap(tmp, 2);
 723
 724         pr_info("EFI v%u.%.02u by %s\n",
 725                 efi.systab->hdr.revision >> 16,
 726                 efi.systab->hdr.revision & 0xffff, vendor);
 727
 728         if (efi_config_init(efi.systab->tables, efi.systab->nr_tables))
 729                 return;
 730
 731         set_bit(EFI_CONFIG_TABLES, &x86_efi_facility);
 732
 733         /*
 734          * Note: We currently don't support runtime services on an EFI
 735          * that doesn't match the kernel 32/64-bit mode.
 736          */
 737
 738         if (!efi_is_native())
 739                 pr_info("No EFI runtime due to 32/64-bit mismatch with kernel\n");
 740         else {
 741                 if (disable_runtime || efi_runtime_init())
 742                         return;
 743                 set_bit(EFI_RUNTIME_SERVICES, &x86_efi_facility);
 744         }
 745
 746         if (efi_memmap_init())
 747                 return;
 748
 749         set_bit(EFI_MEMMAP, &x86_efi_facility);
 750
 751 #ifdef CONFIG_X86_32
 752         if (efi_is_native()) {
 753                 x86_platform.get_wallclock = efi_get_time;
 754                 x86_platform.set_wallclock = efi_set_rtc_mmss;
 755         }
 756 #endif
 757
 758 #if EFI_DEBUG
 759         print_efi_memmap();
 760 #endif
 761 }
 762
 763 void __init efi_late_init(void)
 764 {
 765         efi_bgrt_init();
 766 }
 767
 768 void __init efi_set_executable(efi_memory_desc_t *md, bool executable)
 769 {
 770         u64 addr, npages;
 771
 772         addr = md->virt_addr;
 773         npages = md->num_pages;
 774
 775         memrange_efi_to_native(&addr, &npages);
 776
 777         if (executable)
 778                 set_memory_x(addr, npages);
 779         else
 780                 set_memory_nx(addr, npages);
 781 }
 782
 783 static void __init runtime_code_page_mkexec(void)
 784 {
 785         efi_memory_desc_t *md;
 786         void *p;
 787
 788         /* Make EFI runtime service code area executable */
 789         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 790                 md = p;
 791
 792                 if (md->type != EFI_RUNTIME_SERVICES_CODE)
 793                         continue;
 794
 795                 efi_set_executable(md, true);
 796         }
 797 }
 798
 799 /*
 800  * We can't ioremap data in EFI boot services RAM, because we've already mapped
 801  * it as RAM.  So, look it up in the existing EFI memory map instead.  Only
 802  * callable after efi_enter_virtual_mode and before efi_free_boot_services.
 803  */
 804 void __iomem *efi_lookup_mapped_addr(u64 phys_addr)
 805 {
 806         void *p;
 807         if (WARN_ON(!memmap.map))
 808                 return NULL;
 809         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 810                 efi_memory_desc_t *md = p;
 811                 u64 size = md->num_pages << EFI_PAGE_SHIFT;
 812                 u64 end = md->phys_addr + size;
 813                 if (!(md->attribute & EFI_MEMORY_RUNTIME) &&
 814                     md->type != EFI_BOOT_SERVICES_CODE &&
 815                     md->type != EFI_BOOT_SERVICES_DATA)
 816                         continue;
 817                 if (!md->virt_addr)
 818                         continue;
 819                 if (phys_addr >= md->phys_addr && phys_addr < end) {
 820                         phys_addr += md->virt_addr - md->phys_addr;
 821                         return (__force void __iomem *)(unsigned long)phys_addr;
 822                 }
 823         }
 824         return NULL;
 825 }
 826
 827 void efi_memory_uc(u64 addr, unsigned long size)
 828 {
 829         unsigned long page_shift = 1UL << EFI_PAGE_SHIFT;
 830         u64 npages;
 831
 832         npages = round_up(size, page_shift) / page_shift;
 833         memrange_efi_to_native(&addr, &npages);
 834         set_memory_uc(addr, npages);
 835 }
 836
 837 /*
 838  * This function will switch the EFI runtime services to virtual mode.
 839  * Essentially, look through the EFI memmap and map every region that
 840  * has the runtime attribute bit set in its memory descriptor and update
 841  * that memory descriptor with the virtual address obtained from ioremap().
 842  * This enables the runtime services to be called without having to
 843  * thunk back into physical mode for every invocation.
 844  */
 845 void __init efi_enter_virtual_mode(void)
 846 {
 847         efi_memory_desc_t *md, *prev_md = NULL;
 848         efi_status_t status;
 849         unsigned long size;
 850         u64 end, systab, start_pfn, end_pfn;
 851         void *p, *va, *new_memmap = NULL;
 852         int count = 0;
 853
 854         efi.systab = NULL;
 855
 856         /*
 857          * We don't do virtual mode, since we don't do runtime services, on
 858          * non-native EFI
 859          */
 860
 861         if (!efi_is_native()) {
 862                 efi_unmap_memmap();
 863                 return;
 864         }
 865
 866         /* Merge contiguous regions of the same type and attribute */
 867         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 868                 u64 prev_size;
 869                 md = p;
 870
 871                 if (!prev_md) {
 872                         prev_md = md;
 873                         continue;
 874                 }
 875
 876                 if (prev_md->type != md->type ||
 877                     prev_md->attribute != md->attribute) {
 878                         prev_md = md;
 879                         continue;
 880                 }
 881
 882                 prev_size = prev_md->num_pages << EFI_PAGE_SHIFT;
 883
 884                 if (md->phys_addr == (prev_md->phys_addr + prev_size)) {
 885                         prev_md->num_pages += md->num_pages;
 886                         md->type = EFI_RESERVED_TYPE;
 887                         md->attribute = 0;
 888                         continue;
 889                 }
 890                 prev_md = md;
 891         }
 892
 893         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 894                 md = p;
 895                 if (!(md->attribute & EFI_MEMORY_RUNTIME) &&
 896                     md->type != EFI_BOOT_SERVICES_CODE &&
 897                     md->type != EFI_BOOT_SERVICES_DATA)
 898                         continue;
 899
 900                 size = md->num_pages << EFI_PAGE_SHIFT;
 901                 end = md->phys_addr + size;
 902
 903                 start_pfn = PFN_DOWN(md->phys_addr);
 904                 end_pfn = PFN_UP(end);
 905                 if (pfn_range_is_mapped(start_pfn, end_pfn)) {
 906                         va = __va(md->phys_addr);
 907
 908                         if (!(md->attribute & EFI_MEMORY_WB))
 909                                 efi_memory_uc((u64)(unsigned long)va, size);
 910                 } else
 911                         va = efi_ioremap(md->phys_addr, size,
 912                                          md->type, md->attribute);
 913
 914                 md->virt_addr = (u64) (unsigned long) va;
 915
 916                 if (!va) {
 917                         pr_err("ioremap of 0x%llX failed!\n",
 918                                (unsigned long long)md->phys_addr);
 919                         continue;
 920                 }
 921
 922                 systab = (u64) (unsigned long) efi_phys.systab;
 923                 if (md->phys_addr <= systab && systab < end) {
 924                         systab += md->virt_addr - md->phys_addr;
 925                         efi.systab = (efi_system_table_t *) (unsigned long) systab;
 926                 }
 927                 new_memmap = krealloc(new_memmap,
 928                                       (count + 1) * memmap.desc_size,
 929                                       GFP_KERNEL);
 930                 memcpy(new_memmap + (count * memmap.desc_size), md,
 931                        memmap.desc_size);
 932                 count++;
 933         }
 934
 935         BUG_ON(!efi.systab);
 936
 937         status = phys_efi_set_virtual_address_map(
 938                 memmap.desc_size * count,
 939                 memmap.desc_size,
 940                 memmap.desc_version,
 941                 (efi_memory_desc_t *)__pa(new_memmap));
 942
 943         if (status != EFI_SUCCESS) {
 944                 pr_alert("Unable to switch EFI into virtual mode "
 945                          "(status=%lx)!\n", status);
 946                 panic("EFI call to SetVirtualAddressMap() failed!");
 947         }
 948
 949         /*
 950          * Now that EFI is in virtual mode, update the function
 951          * pointers in the runtime service table to the new virtual addresses.
 952          *
 953          * Call EFI services through wrapper functions.
 954          */
 955         efi.runtime_version = efi_systab.hdr.revision;
 956         efi.get_time = virt_efi_get_time;
 957         efi.set_time = virt_efi_set_time;
 958         efi.get_wakeup_time = virt_efi_get_wakeup_time;
 959         efi.set_wakeup_time = virt_efi_set_wakeup_time;
 960         efi.get_variable = virt_efi_get_variable;
 961         efi.get_next_variable = virt_efi_get_next_variable;
 962         efi.set_variable = virt_efi_set_variable;
 963         efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count;
 964         efi.reset_system = virt_efi_reset_system;
 965         efi.set_virtual_address_map = NULL;
 966         efi.query_variable_info = virt_efi_query_variable_info;
 967         efi.update_capsule = virt_efi_update_capsule;
 968         efi.query_capsule_caps = virt_efi_query_capsule_caps;
 969         if (__supported_pte_mask & _PAGE_NX)
 970                 runtime_code_page_mkexec();
 971
 972         kfree(new_memmap);
 973 }
 974
 975 /*
 976  * Convenience functions to obtain memory types and attributes
 977  */
 978 u32 efi_mem_type(unsigned long phys_addr)
 979 {
 980         efi_memory_desc_t *md;
 981         void *p;
 982
 983         if (!efi_enabled(EFI_MEMMAP))
 984                 return 0;
 985
 986         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 987                 md = p;
 988                 if ((md->phys_addr <= phys_addr) &&
 989                     (phys_addr < (md->phys_addr +
 990                                   (md->num_pages << EFI_PAGE_SHIFT))))
 991                         return md->type;
 992         }
 993         return 0;
 994 }
 995
 996 u64 efi_mem_attributes(unsigned long phys_addr)
 997 {
 998         efi_memory_desc_t *md;
 999         void *p;
1000
1001         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
1002                 md = p;
1003                 if ((md->phys_addr <= phys_addr) &&
1004                     (phys_addr < (md->phys_addr +
1005                                   (md->num_pages << EFI_PAGE_SHIFT))))
1006                         return md->attribute;
1007         }
1008         return 0;
1009 }