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