cmd/bootefi.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  *  EFI application loader
   4  *
   5  *  Copyright (c) 2016 Alexander Graf
   6  */
   7
   8 #include <common.h>
   9 #include <charset.h>
  10 #include <command.h>
  11 #include <dm.h>
  12 #include <efi_loader.h>
  13 #include <efi_selftest.h>
  14 #include <env.h>
  15 #include <errno.h>
  16 #include <image.h>
  17 #include <malloc.h>
  18 #include <linux/libfdt.h>
  19 #include <linux/libfdt_env.h>
  20 #include <mapmem.h>
  21 #include <memalign.h>
  22 #include <asm-generic/sections.h>
  23 #include <linux/linkage.h>
  24
  25 DECLARE_GLOBAL_DATA_PTR;
  26
  27 static struct efi_device_path *bootefi_image_path;
  28 static struct efi_device_path *bootefi_device_path;
  29
  30 /**
  31  * Set the load options of an image from an environment variable.
  32  *
  33  * @handle:             the image handle
  34  * @env_var:            name of the environment variable
  35  * @load_options:       pointer to load options (output)
  36  * Return:              status code
  37  */
  38 static efi_status_t set_load_options(efi_handle_t handle, const char *env_var,
  39                                      u16 **load_options)
  40 {
  41         struct efi_loaded_image *loaded_image_info;
  42         size_t size;
  43         const char *env = env_get(env_var);
  44         u16 *pos;
  45         efi_status_t ret;
  46
  47         *load_options = NULL;
  48         ret = EFI_CALL(systab.boottime->open_protocol(
  49                                         handle,
  50                                         &efi_guid_loaded_image,
  51                                         (void **)&loaded_image_info,
  52                                         efi_root, NULL,
  53                                         EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL));
  54         if (ret != EFI_SUCCESS)
  55                 return EFI_INVALID_PARAMETER;
  56
  57         loaded_image_info->load_options = NULL;
  58         loaded_image_info->load_options_size = 0;
  59         if (!env)
  60                 goto out;
  61
  62         size = utf8_utf16_strlen(env) + 1;
  63         loaded_image_info->load_options = calloc(size, sizeof(u16));
  64         if (!loaded_image_info->load_options) {
  65                 printf("ERROR: Out of memory\n");
  66                 EFI_CALL(systab.boottime->close_protocol(handle,
  67                                                          &efi_guid_loaded_image,
  68                                                          efi_root, NULL));
  69                 return EFI_OUT_OF_RESOURCES;
  70         }
  71         pos = loaded_image_info->load_options;
  72         *load_options = pos;
  73         utf8_utf16_strcpy(&pos, env);
  74         loaded_image_info->load_options_size = size * 2;
  75
  76 out:
  77         return EFI_CALL(systab.boottime->close_protocol(handle,
  78                                                         &efi_guid_loaded_image,
  79                                                         efi_root, NULL));
  80 }
  81
  82 #if !CONFIG_IS_ENABLED(GENERATE_ACPI_TABLE)
  83
  84 /**
  85  * copy_fdt() - Copy the device tree to a new location available to EFI
  86  *
  87  * The FDT is copied to a suitable location within the EFI memory map.
  88  * Additional 12 KiB are added to the space in case the device tree needs to be
  89  * expanded later with fdt_open_into().
  90  *
  91  * @fdtp:       On entry a pointer to the flattened device tree.
  92  *              On exit a pointer to the copy of the flattened device tree.
  93  *              FDT start
  94  * Return:      status code
  95  */
  96 static efi_status_t copy_fdt(void **fdtp)
  97 {
  98         unsigned long fdt_ram_start = -1L, fdt_pages;
  99         efi_status_t ret = 0;
 100         void *fdt, *new_fdt;
 101         u64 new_fdt_addr;
 102         uint fdt_size;
 103         int i;
 104
 105         for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
 106                 u64 ram_start = gd->bd->bi_dram[i].start;
 107                 u64 ram_size = gd->bd->bi_dram[i].size;
 108
 109                 if (!ram_size)
 110                         continue;
 111
 112                 if (ram_start < fdt_ram_start)
 113                         fdt_ram_start = ram_start;
 114         }
 115
 116         /*
 117          * Give us at least 12 KiB of breathing room in case the device tree
 118          * needs to be expanded later.
 119          */
 120         fdt = *fdtp;
 121         fdt_pages = efi_size_in_pages(fdt_totalsize(fdt) + 0x3000);
 122         fdt_size = fdt_pages << EFI_PAGE_SHIFT;
 123
 124         /*
 125          * Safe fdt location is at 127 MiB.
 126          * On the sandbox convert from the sandbox address space.
 127          */
 128         new_fdt_addr = (uintptr_t)map_sysmem(fdt_ram_start + 0x7f00000 +
 129                                              fdt_size, 0);
 130         ret = efi_allocate_pages(EFI_ALLOCATE_MAX_ADDRESS,
 131                                  EFI_ACPI_RECLAIM_MEMORY, fdt_pages,
 132                                  &new_fdt_addr);
 133         if (ret != EFI_SUCCESS) {
 134                 /* If we can't put it there, put it somewhere */
 135                 new_fdt_addr = (ulong)memalign(EFI_PAGE_SIZE, fdt_size);
 136                 ret = efi_allocate_pages(EFI_ALLOCATE_MAX_ADDRESS,
 137                                          EFI_ACPI_RECLAIM_MEMORY, fdt_pages,
 138                                          &new_fdt_addr);
 139                 if (ret != EFI_SUCCESS) {
 140                         printf("ERROR: Failed to reserve space for FDT\n");
 141                         goto done;
 142                 }
 143         }
 144         new_fdt = (void *)(uintptr_t)new_fdt_addr;
 145         memcpy(new_fdt, fdt, fdt_totalsize(fdt));
 146         fdt_set_totalsize(new_fdt, fdt_size);
 147
 148         *fdtp = (void *)(uintptr_t)new_fdt_addr;
 149 done:
 150         return ret;
 151 }
 152
 153 static void efi_reserve_memory(u64 addr, u64 size)
 154 {
 155         /* Convert from sandbox address space. */
 156         addr = (uintptr_t)map_sysmem(addr, 0);
 157         if (efi_add_memory_map(addr, size,
 158                                EFI_RESERVED_MEMORY_TYPE) != EFI_SUCCESS)
 159                 printf("Reserved memory mapping failed addr %llx size %llx\n",
 160                        addr, size);
 161 }
 162
 163 /**
 164  * efi_carve_out_dt_rsv() - Carve out DT reserved memory ranges
 165  *
 166  * The mem_rsv entries of the FDT are added to the memory map. Any failures are
 167  * ignored because this is not critical and we would rather continue to try to
 168  * boot.
 169  *
 170  * @fdt: Pointer to device tree
 171  */
 172 static void efi_carve_out_dt_rsv(void *fdt)
 173 {
 174         int nr_rsv, i;
 175         u64 addr, size;
 176         int nodeoffset, subnode;
 177
 178         nr_rsv = fdt_num_mem_rsv(fdt);
 179
 180         /* Look for an existing entry and add it to the efi mem map. */
 181         for (i = 0; i < nr_rsv; i++) {
 182                 if (fdt_get_mem_rsv(fdt, i, &addr, &size) != 0)
 183                         continue;
 184                 efi_reserve_memory(addr, size);
 185         }
 186
 187         /* process reserved-memory */
 188         nodeoffset = fdt_subnode_offset(fdt, 0, "reserved-memory");
 189         if (nodeoffset >= 0) {
 190                 subnode = fdt_first_subnode(fdt, nodeoffset);
 191                 while (subnode >= 0) {
 192                         fdt_addr_t fdt_addr;
 193                         fdt_size_t fdt_size;
 194
 195                         /* check if this subnode has a reg property */
 196                         fdt_addr = fdtdec_get_addr_size_auto_parent(
 197                                                 fdt, nodeoffset, subnode,
 198                                                 "reg", 0, &fdt_size, false);
 199                         /*
 200                          * The /reserved-memory node may have children with
 201                          * a size instead of a reg property.
 202                          */
 203                         if (addr != FDT_ADDR_T_NONE &&
 204                             fdtdec_get_is_enabled(fdt, subnode))
 205                                 efi_reserve_memory(fdt_addr, fdt_size);
 206                         subnode = fdt_next_subnode(fdt, subnode);
 207                 }
 208         }
 209 }
 210
 211 /**
 212  * get_config_table() - get configuration table
 213  *
 214  * @guid:       GUID of the configuration table
 215  * Return:      pointer to configuration table or NULL
 216  */
 217 static void *get_config_table(const efi_guid_t *guid)
 218 {
 219         size_t i;
 220
 221         for (i = 0; i < systab.nr_tables; i++) {
 222                 if (!guidcmp(guid, &systab.tables[i].guid))
 223                         return systab.tables[i].table;
 224         }
 225         return NULL;
 226 }
 227
 228 #endif /* !CONFIG_IS_ENABLED(GENERATE_ACPI_TABLE) */
 229
 230 /**
 231  * efi_install_fdt() - install device tree
 232  *
 233  * If fdt is not EFI_FDT_USE_INTERNAL, the device tree located at that memory
 234  * address will will be installed as configuration table, otherwise the device
 235  * tree located at the address indicated by environment variable fdt_addr or as
 236  * fallback fdtcontroladdr will be used.
 237  *
 238  * On architectures using ACPI tables device trees shall not be installed as
 239  * configuration table.
 240  *
 241  * @fdt:        address of device tree or EFI_FDT_USE_INTERNAL to use the
 242  *              the hardware device tree as indicated by environment variable
 243  *              fdt_addr or as fallback the internal device tree as indicated by
 244  *              the environment variable fdtcontroladdr
 245  * Return:      status code
 246  */
 247 efi_status_t efi_install_fdt(void *fdt)
 248 {
 249         /*
 250          * The EBBR spec requires that we have either an FDT or an ACPI table
 251          * but not both.
 252          */
 253 #if CONFIG_IS_ENABLED(GENERATE_ACPI_TABLE)
 254         if (fdt) {
 255                 printf("ERROR: can't have ACPI table and device tree.\n");
 256                 return EFI_LOAD_ERROR;
 257         }
 258 #else
 259         bootm_headers_t img = { 0 };
 260         efi_status_t ret;
 261
 262         if (fdt == EFI_FDT_USE_INTERNAL) {
 263                 const char *fdt_opt;
 264                 uintptr_t fdt_addr;
 265
 266                 /* Look for device tree that is already installed */
 267                 if (get_config_table(&efi_guid_fdt))
 268                         return EFI_SUCCESS;
 269                 /* Check if there is a hardware device tree */
 270                 fdt_opt = env_get("fdt_addr");
 271                 /* Use our own device tree as fallback */
 272                 if (!fdt_opt) {
 273                         fdt_opt = env_get("fdtcontroladdr");
 274                         if (!fdt_opt) {
 275                                 printf("ERROR: need device tree\n");
 276                                 return EFI_NOT_FOUND;
 277                         }
 278                 }
 279                 fdt_addr = simple_strtoul(fdt_opt, NULL, 16);
 280                 if (!fdt_addr) {
 281                         printf("ERROR: invalid $fdt_addr or $fdtcontroladdr\n");
 282                         return EFI_LOAD_ERROR;
 283                 }
 284                 fdt = map_sysmem(fdt_addr, 0);
 285         }
 286
 287         /* Install device tree */
 288         if (fdt_check_header(fdt)) {
 289                 printf("ERROR: invalid device tree\n");
 290                 return EFI_LOAD_ERROR;
 291         }
 292
 293         /* Prepare device tree for payload */
 294         ret = copy_fdt(&fdt);
 295         if (ret) {
 296                 printf("ERROR: out of memory\n");
 297                 return EFI_OUT_OF_RESOURCES;
 298         }
 299
 300         if (image_setup_libfdt(&img, fdt, 0, NULL)) {
 301                 printf("ERROR: failed to process device tree\n");
 302                 return EFI_LOAD_ERROR;
 303         }
 304
 305         /* Create memory reservations as indicated by the device tree */
 306         efi_carve_out_dt_rsv(fdt);
 307
 308         /* Install device tree as UEFI table */
 309         ret = efi_install_configuration_table(&efi_guid_fdt, fdt);
 310         if (ret != EFI_SUCCESS) {
 311                 printf("ERROR: failed to install device tree\n");
 312                 return ret;
 313         }
 314 #endif /* GENERATE_ACPI_TABLE */
 315
 316         return EFI_SUCCESS;
 317 }
 318
 319 /**
 320  * do_bootefi_exec() - execute EFI binary
 321  *
 322  * @handle:             handle of loaded image
 323  * Return:              status code
 324  *
 325  * Load the EFI binary into a newly assigned memory unwinding the relocation
 326  * information, install the loaded image protocol, and call the binary.
 327  */
 328 static efi_status_t do_bootefi_exec(efi_handle_t handle)
 329 {
 330         efi_status_t ret;
 331         efi_uintn_t exit_data_size = 0;
 332         u16 *exit_data = NULL;
 333         u16 *load_options;
 334
 335         /* Transfer environment variable as load options */
 336         ret = set_load_options(handle, "bootargs", &load_options);
 337         if (ret != EFI_SUCCESS)
 338                 return ret;
 339
 340         /* Call our payload! */
 341         ret = EFI_CALL(efi_start_image(handle, &exit_data_size, &exit_data));
 342         printf("## Application terminated, r = %lu\n", ret & ~EFI_ERROR_MASK);
 343         if (ret && exit_data) {
 344                 printf("## %ls\n", exit_data);
 345                 efi_free_pool(exit_data);
 346         }
 347
 348         efi_restore_gd();
 349
 350         free(load_options);
 351
 352         return ret;
 353 }
 354
 355 /**
 356  * do_efibootmgr() - execute EFI boot manager
 357  *
 358  * Return:      status code
 359  */
 360 static int do_efibootmgr(void)
 361 {
 362         efi_handle_t handle;
 363         efi_status_t ret;
 364
 365         ret = efi_bootmgr_load(&handle);
 366         if (ret != EFI_SUCCESS) {
 367                 printf("EFI boot manager: Cannot load any image\n");
 368                 return CMD_RET_FAILURE;
 369         }
 370
 371         ret = do_bootefi_exec(handle);
 372
 373         if (ret != EFI_SUCCESS)
 374                 return CMD_RET_FAILURE;
 375
 376         return CMD_RET_SUCCESS;
 377 }
 378
 379 /**
 380  * do_bootefi_image() - execute EFI binary
 381  *
 382  * Set up memory image for the binary to be loaded, prepare device path, and
 383  * then call do_bootefi_exec() to execute it.
 384  *
 385  * @image_opt:  string of image start address
 386  * Return:      status code
 387  */
 388 static int do_bootefi_image(const char *image_opt)
 389 {
 390         void *image_buf;
 391         unsigned long addr, size;
 392         const char *size_str;
 393         efi_status_t ret;
 394
 395 #ifdef CONFIG_CMD_BOOTEFI_HELLO
 396         if (!strcmp(image_opt, "hello")) {
 397                 char *saddr;
 398
 399                 saddr = env_get("loadaddr");
 400                 size = __efi_helloworld_end - __efi_helloworld_begin;
 401
 402                 if (saddr)
 403                         addr = simple_strtoul(saddr, NULL, 16);
 404                 else
 405                         addr = CONFIG_SYS_LOAD_ADDR;
 406
 407                 image_buf = map_sysmem(addr, size);
 408                 memcpy(image_buf, __efi_helloworld_begin, size);
 409
 410                 efi_free_pool(bootefi_device_path);
 411                 efi_free_pool(bootefi_image_path);
 412                 bootefi_device_path = NULL;
 413                 bootefi_image_path = NULL;
 414         } else
 415 #endif
 416         {
 417                 size_str = env_get("filesize");
 418                 if (size_str)
 419                         size = simple_strtoul(size_str, NULL, 16);
 420                 else
 421                         size = 0;
 422
 423                 addr = simple_strtoul(image_opt, NULL, 16);
 424                 /* Check that a numeric value was passed */
 425                 if (!addr && *image_opt != '0')
 426                         return CMD_RET_USAGE;
 427
 428                 image_buf = map_sysmem(addr, size);
 429         }
 430         ret = efi_run_image(image_buf, size);
 431
 432         if (ret != EFI_SUCCESS)
 433                 return CMD_RET_FAILURE;
 434
 435         return CMD_RET_SUCCESS;
 436 }
 437
 438 /**
 439  * efi_run_image() - run loaded UEFI image
 440  *
 441  * @source_buffer:      memory address of the UEFI image
 442  * @source_size:        size of the UEFI image
 443  * Return:              status code
 444  */
 445 efi_status_t efi_run_image(void *source_buffer, efi_uintn_t source_size)
 446 {
 447         efi_handle_t mem_handle = NULL, handle;
 448         struct efi_device_path *file_path = NULL;
 449         efi_status_t ret;
 450
 451         if (!bootefi_device_path || !bootefi_image_path) {
 452                 /*
 453                  * Special case for efi payload not loaded from disk,
 454                  * such as 'bootefi hello' or for example payload
 455                  * loaded directly into memory via JTAG, etc:
 456                  */
 457                 file_path = efi_dp_from_mem(EFI_RESERVED_MEMORY_TYPE,
 458                                             (uintptr_t)source_buffer,
 459                                             source_size);
 460                 /*
 461                  * Make sure that device for device_path exist
 462                  * in load_image(). Otherwise, shell and grub will fail.
 463                  */
 464                 ret = efi_create_handle(&mem_handle);
 465                 if (ret != EFI_SUCCESS)
 466                         goto out;
 467
 468                 ret = efi_add_protocol(mem_handle, &efi_guid_device_path,
 469                                        file_path);
 470                 if (ret != EFI_SUCCESS)
 471                         goto out;
 472         } else {
 473                 file_path = efi_dp_append(bootefi_device_path,
 474                                           bootefi_image_path);
 475         }
 476
 477         ret = EFI_CALL(efi_load_image(false, efi_root, file_path, source_buffer,
 478                                       source_size, &handle));
 479         if (ret != EFI_SUCCESS)
 480                 goto out;
 481
 482         ret = do_bootefi_exec(handle);
 483
 484 out:
 485         efi_delete_handle(mem_handle);
 486         efi_free_pool(file_path);
 487         return ret;
 488 }
 489
 490 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
 491 static efi_status_t bootefi_run_prepare(const char *load_options_path,
 492                 struct efi_device_path *device_path,
 493                 struct efi_device_path *image_path,
 494                 struct efi_loaded_image_obj **image_objp,
 495                 struct efi_loaded_image **loaded_image_infop)
 496 {
 497         efi_status_t ret;
 498         u16 *load_options;
 499
 500         ret = efi_setup_loaded_image(device_path, image_path, image_objp,
 501                                      loaded_image_infop);
 502         if (ret != EFI_SUCCESS)
 503                 return ret;
 504
 505         /* Transfer environment variable as load options */
 506         return set_load_options((efi_handle_t)*image_objp, load_options_path,
 507                                 &load_options);
 508 }
 509
 510 /**
 511  * bootefi_test_prepare() - prepare to run an EFI test
 512  *
 513  * Prepare to run a test as if it were provided by a loaded image.
 514  *
 515  * @image_objp:         pointer to be set to the loaded image handle
 516  * @loaded_image_infop: pointer to be set to the loaded image protocol
 517  * @path:               dummy file path used to construct the device path
 518  *                      set in the loaded image protocol
 519  * @load_options_path:  name of a U-Boot environment variable. Its value is
 520  *                      set as load options in the loaded image protocol.
 521  * Return:              status code
 522  */
 523 static efi_status_t bootefi_test_prepare
 524                 (struct efi_loaded_image_obj **image_objp,
 525                  struct efi_loaded_image **loaded_image_infop, const char *path,
 526                  const char *load_options_path)
 527 {
 528         efi_status_t ret;
 529
 530         /* Construct a dummy device path */
 531         bootefi_device_path = efi_dp_from_mem(EFI_RESERVED_MEMORY_TYPE, 0, 0);
 532         if (!bootefi_device_path)
 533                 return EFI_OUT_OF_RESOURCES;
 534
 535         bootefi_image_path = efi_dp_from_file(NULL, 0, path);
 536         if (!bootefi_image_path) {
 537                 ret = EFI_OUT_OF_RESOURCES;
 538                 goto failure;
 539         }
 540
 541         ret = bootefi_run_prepare(load_options_path, bootefi_device_path,
 542                                   bootefi_image_path, image_objp,
 543                                   loaded_image_infop);
 544         if (ret == EFI_SUCCESS)
 545                 return ret;
 546
 547         efi_free_pool(bootefi_image_path);
 548         bootefi_image_path = NULL;
 549 failure:
 550         efi_free_pool(bootefi_device_path);
 551         bootefi_device_path = NULL;
 552         return ret;
 553 }
 554
 555 /**
 556  * bootefi_run_finish() - finish up after running an EFI test
 557  *
 558  * @loaded_image_info: Pointer to a struct which holds the loaded image info
 559  * @image_obj: Pointer to a struct which holds the loaded image object
 560  */
 561 static void bootefi_run_finish(struct efi_loaded_image_obj *image_obj,
 562                                struct efi_loaded_image *loaded_image_info)
 563 {
 564         efi_restore_gd();
 565         free(loaded_image_info->load_options);
 566         efi_delete_handle(&image_obj->header);
 567 }
 568
 569 /**
 570  * do_efi_selftest() - execute EFI selftest
 571  *
 572  * Return:      status code
 573  */
 574 static int do_efi_selftest(void)
 575 {
 576         struct efi_loaded_image_obj *image_obj;
 577         struct efi_loaded_image *loaded_image_info;
 578         efi_status_t ret;
 579
 580         ret = bootefi_test_prepare(&image_obj, &loaded_image_info,
 581                                    "\\selftest", "efi_selftest");
 582         if (ret != EFI_SUCCESS)
 583                 return CMD_RET_FAILURE;
 584
 585         /* Execute the test */
 586         ret = EFI_CALL(efi_selftest(&image_obj->header, &systab));
 587         bootefi_run_finish(image_obj, loaded_image_info);
 588
 589         return ret != EFI_SUCCESS;
 590 }
 591 #endif /* CONFIG_CMD_BOOTEFI_SELFTEST */
 592
 593 /**
 594  * do_bootefi() - execute `bootefi` command
 595  *
 596  * @cmdtp:      table entry describing command
 597  * @flag:       bitmap indicating how the command was invoked
 598  * @argc:       number of arguments
 599  * @argv:       command line arguments
 600  * Return:      status code
 601  */
 602 static int do_bootefi(struct cmd_tbl *cmdtp, int flag, int argc,
 603                       char *const argv[])
 604 {
 605         efi_status_t ret;
 606         void *fdt;
 607
 608         if (argc < 2)
 609                 return CMD_RET_USAGE;
 610
 611         /* Initialize EFI drivers */
 612         ret = efi_init_obj_list();
 613         if (ret != EFI_SUCCESS) {
 614                 printf("Error: Cannot initialize UEFI sub-system, r = %lu\n",
 615                        ret & ~EFI_ERROR_MASK);
 616                 return CMD_RET_FAILURE;
 617         }
 618
 619         if (argc > 2) {
 620                 uintptr_t fdt_addr;
 621
 622                 fdt_addr = simple_strtoul(argv[2], NULL, 16);
 623                 fdt = map_sysmem(fdt_addr, 0);
 624         } else {
 625                 fdt = EFI_FDT_USE_INTERNAL;
 626         }
 627         ret = efi_install_fdt(fdt);
 628         if (ret == EFI_INVALID_PARAMETER)
 629                 return CMD_RET_USAGE;
 630         else if (ret != EFI_SUCCESS)
 631                 return CMD_RET_FAILURE;
 632
 633         if (!strcmp(argv[1], "bootmgr"))
 634                 return do_efibootmgr();
 635 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
 636         else if (!strcmp(argv[1], "selftest"))
 637                 return do_efi_selftest();
 638 #endif
 639
 640         return do_bootefi_image(argv[1]);
 641 }
 642
 643 #ifdef CONFIG_SYS_LONGHELP
 644 static char bootefi_help_text[] =
 645         "<image address> [fdt address]\n"
 646         "  - boot EFI payload stored at address <image address>.\n"
 647         "    If specified, the device tree located at <fdt address> gets\n"
 648         "    exposed as EFI configuration table.\n"
 649 #ifdef CONFIG_CMD_BOOTEFI_HELLO
 650         "bootefi hello\n"
 651         "  - boot a sample Hello World application stored within U-Boot\n"
 652 #endif
 653 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
 654         "bootefi selftest [fdt address]\n"
 655         "  - boot an EFI selftest application stored within U-Boot\n"
 656         "    Use environment variable efi_selftest to select a single test.\n"
 657         "    Use 'setenv efi_selftest list' to enumerate all tests.\n"
 658 #endif
 659         "bootefi bootmgr [fdt address]\n"
 660         "  - load and boot EFI payload based on BootOrder/BootXXXX variables.\n"
 661         "\n"
 662         "    If specified, the device tree located at <fdt address> gets\n"
 663         "    exposed as EFI configuration table.\n";
 664 #endif
 665
 666 U_BOOT_CMD(
 667         bootefi, 3, 0, do_bootefi,
 668         "Boots an EFI payload from memory",
 669         bootefi_help_text
 670 );
 671
 672 /**
 673  * efi_set_bootdev() - set boot device
 674  *
 675  * This function is called when a file is loaded, e.g. via the 'load' command.
 676  * We use the path to this file to inform the UEFI binary about the boot device.
 677  *
 678  * @dev:        device, e.g. "MMC"
 679  * @devnr:      number of the device, e.g. "1:2"
 680  * @path:       path to file loaded
 681  */
 682 void efi_set_bootdev(const char *dev, const char *devnr, const char *path)
 683 {
 684         struct efi_device_path *device, *image;
 685         efi_status_t ret;
 686
 687         /* efi_set_bootdev is typically called repeatedly, recover memory */
 688         efi_free_pool(bootefi_device_path);
 689         efi_free_pool(bootefi_image_path);
 690
 691         ret = efi_dp_from_name(dev, devnr, path, &device, &image);
 692         if (ret == EFI_SUCCESS) {
 693                 bootefi_device_path = device;
 694                 if (image) {
 695                         /* FIXME: image should not contain device */
 696                         struct efi_device_path *image_tmp = image;
 697
 698                         efi_dp_split_file_path(image, &device, &image);
 699                         efi_free_pool(image_tmp);
 700                 }
 701                 bootefi_image_path = image;
 702         } else {
 703                 bootefi_device_path = NULL;
 704                 bootefi_image_path = NULL;
 705         }
 706 }