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 #define LOG_CATEGORY LOGC_EFI
   9
  10 #include <common.h>
  11 #include <charset.h>
  12 #include <command.h>
  13 #include <dm.h>
  14 #include <efi_loader.h>
  15 #include <efi_selftest.h>
  16 #include <env.h>
  17 #include <errno.h>
  18 #include <image.h>
  19 #include <log.h>
  20 #include <malloc.h>
  21 #include <linux/libfdt.h>
  22 #include <linux/libfdt_env.h>
  23 #include <mapmem.h>
  24 #include <memalign.h>
  25 #include <asm-generic/sections.h>
  26 #include <linux/linkage.h>
  27
  28 DECLARE_GLOBAL_DATA_PTR;
  29
  30 static struct efi_device_path *bootefi_image_path;
  31 static struct efi_device_path *bootefi_device_path;
  32
  33 /**
  34  * Set the load options of an image from an environment variable.
  35  *
  36  * @handle:             the image handle
  37  * @env_var:            name of the environment variable
  38  * @load_options:       pointer to load options (output)
  39  * Return:              status code
  40  */
  41 static efi_status_t set_load_options(efi_handle_t handle, const char *env_var,
  42                                      u16 **load_options)
  43 {
  44         struct efi_loaded_image *loaded_image_info;
  45         size_t size;
  46         const char *env = env_get(env_var);
  47         u16 *pos;
  48         efi_status_t ret;
  49
  50         *load_options = NULL;
  51         ret = EFI_CALL(systab.boottime->open_protocol(
  52                                         handle,
  53                                         &efi_guid_loaded_image,
  54                                         (void **)&loaded_image_info,
  55                                         efi_root, NULL,
  56                                         EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL));
  57         if (ret != EFI_SUCCESS)
  58                 return EFI_INVALID_PARAMETER;
  59
  60         loaded_image_info->load_options = NULL;
  61         loaded_image_info->load_options_size = 0;
  62         if (!env)
  63                 goto out;
  64
  65         size = utf8_utf16_strlen(env) + 1;
  66         loaded_image_info->load_options = calloc(size, sizeof(u16));
  67         if (!loaded_image_info->load_options) {
  68                 log_err("ERROR: Out of memory\n");
  69                 EFI_CALL(systab.boottime->close_protocol(handle,
  70                                                          &efi_guid_loaded_image,
  71                                                          efi_root, NULL));
  72                 return EFI_OUT_OF_RESOURCES;
  73         }
  74         pos = loaded_image_info->load_options;
  75         *load_options = pos;
  76         utf8_utf16_strcpy(&pos, env);
  77         loaded_image_info->load_options_size = size * 2;
  78
  79 out:
  80         return EFI_CALL(systab.boottime->close_protocol(handle,
  81                                                         &efi_guid_loaded_image,
  82                                                         efi_root, NULL));
  83 }
  84
  85 #if !CONFIG_IS_ENABLED(GENERATE_ACPI_TABLE)
  86
  87 /**
  88  * copy_fdt() - Copy the device tree to a new location available to EFI
  89  *
  90  * The FDT is copied to a suitable location within the EFI memory map.
  91  * Additional 12 KiB are added to the space in case the device tree needs to be
  92  * expanded later with fdt_open_into().
  93  *
  94  * @fdtp:       On entry a pointer to the flattened device tree.
  95  *              On exit a pointer to the copy of the flattened device tree.
  96  *              FDT start
  97  * Return:      status code
  98  */
  99 static efi_status_t copy_fdt(void **fdtp)
 100 {
 101         unsigned long fdt_ram_start = -1L, fdt_pages;
 102         efi_status_t ret = 0;
 103         void *fdt, *new_fdt;
 104         u64 new_fdt_addr;
 105         uint fdt_size;
 106         int i;
 107
 108         for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
 109                 u64 ram_start = gd->bd->bi_dram[i].start;
 110                 u64 ram_size = gd->bd->bi_dram[i].size;
 111
 112                 if (!ram_size)
 113                         continue;
 114
 115                 if (ram_start < fdt_ram_start)
 116                         fdt_ram_start = ram_start;
 117         }
 118
 119         /*
 120          * Give us at least 12 KiB of breathing room in case the device tree
 121          * needs to be expanded later.
 122          */
 123         fdt = *fdtp;
 124         fdt_pages = efi_size_in_pages(fdt_totalsize(fdt) + 0x3000);
 125         fdt_size = fdt_pages << EFI_PAGE_SHIFT;
 126
 127         /*
 128          * Safe fdt location is at 127 MiB.
 129          * On the sandbox convert from the sandbox address space.
 130          */
 131         new_fdt_addr = (uintptr_t)map_sysmem(fdt_ram_start + 0x7f00000 +
 132                                              fdt_size, 0);
 133         ret = efi_allocate_pages(EFI_ALLOCATE_MAX_ADDRESS,
 134                                  EFI_ACPI_RECLAIM_MEMORY, fdt_pages,
 135                                  &new_fdt_addr);
 136         if (ret != EFI_SUCCESS) {
 137                 /* If we can't put it there, put it somewhere */
 138                 new_fdt_addr = (ulong)memalign(EFI_PAGE_SIZE, fdt_size);
 139                 ret = efi_allocate_pages(EFI_ALLOCATE_MAX_ADDRESS,
 140                                          EFI_ACPI_RECLAIM_MEMORY, fdt_pages,
 141                                          &new_fdt_addr);
 142                 if (ret != EFI_SUCCESS) {
 143                         log_err("ERROR: Failed to reserve space for FDT\n");
 144                         goto done;
 145                 }
 146         }
 147         new_fdt = (void *)(uintptr_t)new_fdt_addr;
 148         memcpy(new_fdt, fdt, fdt_totalsize(fdt));
 149         fdt_set_totalsize(new_fdt, fdt_size);
 150
 151         *fdtp = (void *)(uintptr_t)new_fdt_addr;
 152 done:
 153         return ret;
 154 }
 155
 156 static void efi_reserve_memory(u64 addr, u64 size)
 157 {
 158         /* Convert from sandbox address space. */
 159         addr = (uintptr_t)map_sysmem(addr, 0);
 160         if (efi_add_memory_map(addr, size,
 161                                EFI_RESERVED_MEMORY_TYPE) != EFI_SUCCESS)
 162                 log_err("Reserved memory mapping failed addr %llx size %llx\n",
 163                         addr, size);
 164 }
 165
 166 /**
 167  * efi_carve_out_dt_rsv() - Carve out DT reserved memory ranges
 168  *
 169  * The mem_rsv entries of the FDT are added to the memory map. Any failures are
 170  * ignored because this is not critical and we would rather continue to try to
 171  * boot.
 172  *
 173  * @fdt: Pointer to device tree
 174  */
 175 static void efi_carve_out_dt_rsv(void *fdt)
 176 {
 177         int nr_rsv, i;
 178         u64 addr, size;
 179         int nodeoffset, subnode;
 180
 181         nr_rsv = fdt_num_mem_rsv(fdt);
 182
 183         /* Look for an existing entry and add it to the efi mem map. */
 184         for (i = 0; i < nr_rsv; i++) {
 185                 if (fdt_get_mem_rsv(fdt, i, &addr, &size) != 0)
 186                         continue;
 187                 efi_reserve_memory(addr, size);
 188         }
 189
 190         /* process reserved-memory */
 191         nodeoffset = fdt_subnode_offset(fdt, 0, "reserved-memory");
 192         if (nodeoffset >= 0) {
 193                 subnode = fdt_first_subnode(fdt, nodeoffset);
 194                 while (subnode >= 0) {
 195                         fdt_addr_t fdt_addr;
 196                         fdt_size_t fdt_size;
 197
 198                         /* check if this subnode has a reg property */
 199                         fdt_addr = fdtdec_get_addr_size_auto_parent(
 200                                                 fdt, nodeoffset, subnode,
 201                                                 "reg", 0, &fdt_size, false);
 202                         /*
 203                          * The /reserved-memory node may have children with
 204                          * a size instead of a reg property.
 205                          */
 206                         if (fdt_addr != FDT_ADDR_T_NONE &&
 207                             fdtdec_get_is_enabled(fdt, subnode))
 208                                 efi_reserve_memory(fdt_addr, fdt_size);
 209                         subnode = fdt_next_subnode(fdt, subnode);
 210                 }
 211         }
 212 }
 213
 214 /**
 215  * get_config_table() - get configuration table
 216  *
 217  * @guid:       GUID of the configuration table
 218  * Return:      pointer to configuration table or NULL
 219  */
 220 static void *get_config_table(const efi_guid_t *guid)
 221 {
 222         size_t i;
 223
 224         for (i = 0; i < systab.nr_tables; i++) {
 225                 if (!guidcmp(guid, &systab.tables[i].guid))
 226                         return systab.tables[i].table;
 227         }
 228         return NULL;
 229 }
 230
 231 #endif /* !CONFIG_IS_ENABLED(GENERATE_ACPI_TABLE) */
 232
 233 /**
 234  * efi_install_fdt() - install device tree
 235  *
 236  * If fdt is not EFI_FDT_USE_INTERNAL, the device tree located at that memory
 237  * address will will be installed as configuration table, otherwise the device
 238  * tree located at the address indicated by environment variable fdt_addr or as
 239  * fallback fdtcontroladdr will be used.
 240  *
 241  * On architectures using ACPI tables device trees shall not be installed as
 242  * configuration table.
 243  *
 244  * @fdt:        address of device tree or EFI_FDT_USE_INTERNAL to use the
 245  *              the hardware device tree as indicated by environment variable
 246  *              fdt_addr or as fallback the internal device tree as indicated by
 247  *              the environment variable fdtcontroladdr
 248  * Return:      status code
 249  */
 250 efi_status_t efi_install_fdt(void *fdt)
 251 {
 252         /*
 253          * The EBBR spec requires that we have either an FDT or an ACPI table
 254          * but not both.
 255          */
 256 #if CONFIG_IS_ENABLED(GENERATE_ACPI_TABLE)
 257         if (fdt) {
 258                 log_err("ERROR: can't have ACPI table and device tree.\n");
 259                 return EFI_LOAD_ERROR;
 260         }
 261 #else
 262         bootm_headers_t img = { 0 };
 263         efi_status_t ret;
 264
 265         if (fdt == EFI_FDT_USE_INTERNAL) {
 266                 const char *fdt_opt;
 267                 uintptr_t fdt_addr;
 268
 269                 /* Look for device tree that is already installed */
 270                 if (get_config_table(&efi_guid_fdt))
 271                         return EFI_SUCCESS;
 272                 /* Check if there is a hardware device tree */
 273                 fdt_opt = env_get("fdt_addr");
 274                 /* Use our own device tree as fallback */
 275                 if (!fdt_opt) {
 276                         fdt_opt = env_get("fdtcontroladdr");
 277                         if (!fdt_opt) {
 278                                 log_err("ERROR: need device tree\n");
 279                                 return EFI_NOT_FOUND;
 280                         }
 281                 }
 282                 fdt_addr = simple_strtoul(fdt_opt, NULL, 16);
 283                 if (!fdt_addr) {
 284                         log_err("ERROR: invalid $fdt_addr or $fdtcontroladdr\n");
 285                         return EFI_LOAD_ERROR;
 286                 }
 287                 fdt = map_sysmem(fdt_addr, 0);
 288         }
 289
 290         /* Install device tree */
 291         if (fdt_check_header(fdt)) {
 292                 log_err("ERROR: invalid device tree\n");
 293                 return EFI_LOAD_ERROR;
 294         }
 295
 296         /* Prepare device tree for payload */
 297         ret = copy_fdt(&fdt);
 298         if (ret) {
 299                 log_err("ERROR: out of memory\n");
 300                 return EFI_OUT_OF_RESOURCES;
 301         }
 302
 303         if (image_setup_libfdt(&img, fdt, 0, NULL)) {
 304                 log_err("ERROR: failed to process device tree\n");
 305                 return EFI_LOAD_ERROR;
 306         }
 307
 308         /* Create memory reservations as indicated by the device tree */
 309         efi_carve_out_dt_rsv(fdt);
 310
 311         /* Install device tree as UEFI table */
 312         ret = efi_install_configuration_table(&efi_guid_fdt, fdt);
 313         if (ret != EFI_SUCCESS) {
 314                 log_err("ERROR: failed to install device tree\n");
 315                 return ret;
 316         }
 317 #endif /* GENERATE_ACPI_TABLE */
 318
 319         return EFI_SUCCESS;
 320 }
 321
 322 /**
 323  * do_bootefi_exec() - execute EFI binary
 324  *
 325  * @handle:             handle of loaded image
 326  * Return:              status code
 327  *
 328  * Load the EFI binary into a newly assigned memory unwinding the relocation
 329  * information, install the loaded image protocol, and call the binary.
 330  */
 331 static efi_status_t do_bootefi_exec(efi_handle_t handle)
 332 {
 333         efi_status_t ret;
 334         efi_uintn_t exit_data_size = 0;
 335         u16 *exit_data = NULL;
 336         u16 *load_options;
 337
 338         /* Transfer environment variable as load options */
 339         ret = set_load_options(handle, "bootargs", &load_options);
 340         if (ret != EFI_SUCCESS)
 341                 return ret;
 342
 343         /* Call our payload! */
 344         ret = EFI_CALL(efi_start_image(handle, &exit_data_size, &exit_data));
 345         if (ret != EFI_SUCCESS) {
 346                 log_err("## Application failed, r = %lu\n",
 347                         ret & ~EFI_ERROR_MASK);
 348                 if (exit_data) {
 349                         log_err("## %ls\n", exit_data);
 350                         efi_free_pool(exit_data);
 351                 }
 352         }
 353
 354         efi_restore_gd();
 355
 356         free(load_options);
 357
 358         return ret;
 359 }
 360
 361 /**
 362  * do_efibootmgr() - execute EFI boot manager
 363  *
 364  * Return:      status code
 365  */
 366 static int do_efibootmgr(void)
 367 {
 368         efi_handle_t handle;
 369         efi_status_t ret;
 370
 371         ret = efi_bootmgr_load(&handle);
 372         if (ret != EFI_SUCCESS) {
 373                 log_notice("EFI boot manager: Cannot load any image\n");
 374                 return CMD_RET_FAILURE;
 375         }
 376
 377         ret = do_bootefi_exec(handle);
 378
 379         if (ret != EFI_SUCCESS)
 380                 return CMD_RET_FAILURE;
 381
 382         return CMD_RET_SUCCESS;
 383 }
 384
 385 /**
 386  * do_bootefi_image() - execute EFI binary
 387  *
 388  * Set up memory image for the binary to be loaded, prepare device path, and
 389  * then call do_bootefi_exec() to execute it.
 390  *
 391  * @image_opt:  string of image start address
 392  * Return:      status code
 393  */
 394 static int do_bootefi_image(const char *image_opt)
 395 {
 396         void *image_buf;
 397         unsigned long addr, size;
 398         const char *size_str;
 399         efi_status_t ret;
 400
 401 #ifdef CONFIG_CMD_BOOTEFI_HELLO
 402         if (!strcmp(image_opt, "hello")) {
 403                 char *saddr;
 404
 405                 saddr = env_get("loadaddr");
 406                 size = __efi_helloworld_end - __efi_helloworld_begin;
 407
 408                 if (saddr)
 409                         addr = simple_strtoul(saddr, NULL, 16);
 410                 else
 411                         addr = CONFIG_SYS_LOAD_ADDR;
 412
 413                 image_buf = map_sysmem(addr, size);
 414                 memcpy(image_buf, __efi_helloworld_begin, size);
 415
 416                 efi_free_pool(bootefi_device_path);
 417                 efi_free_pool(bootefi_image_path);
 418                 bootefi_device_path = NULL;
 419                 bootefi_image_path = NULL;
 420         } else
 421 #endif
 422         {
 423                 size_str = env_get("filesize");
 424                 if (size_str)
 425                         size = simple_strtoul(size_str, NULL, 16);
 426                 else
 427                         size = 0;
 428
 429                 addr = simple_strtoul(image_opt, NULL, 16);
 430                 /* Check that a numeric value was passed */
 431                 if (!addr && *image_opt != '0')
 432                         return CMD_RET_USAGE;
 433
 434                 image_buf = map_sysmem(addr, size);
 435         }
 436         ret = efi_run_image(image_buf, size);
 437
 438         if (ret != EFI_SUCCESS)
 439                 return CMD_RET_FAILURE;
 440
 441         return CMD_RET_SUCCESS;
 442 }
 443
 444 /**
 445  * efi_run_image() - run loaded UEFI image
 446  *
 447  * @source_buffer:      memory address of the UEFI image
 448  * @source_size:        size of the UEFI image
 449  * Return:              status code
 450  */
 451 efi_status_t efi_run_image(void *source_buffer, efi_uintn_t source_size)
 452 {
 453         efi_handle_t mem_handle = NULL, handle;
 454         struct efi_device_path *file_path = NULL;
 455         efi_status_t ret;
 456
 457         if (!bootefi_device_path || !bootefi_image_path) {
 458                 /*
 459                  * Special case for efi payload not loaded from disk,
 460                  * such as 'bootefi hello' or for example payload
 461                  * loaded directly into memory via JTAG, etc:
 462                  */
 463                 file_path = efi_dp_from_mem(EFI_RESERVED_MEMORY_TYPE,
 464                                             (uintptr_t)source_buffer,
 465                                             source_size);
 466                 /*
 467                  * Make sure that device for device_path exist
 468                  * in load_image(). Otherwise, shell and grub will fail.
 469                  */
 470                 ret = efi_create_handle(&mem_handle);
 471                 if (ret != EFI_SUCCESS)
 472                         goto out;
 473
 474                 ret = efi_add_protocol(mem_handle, &efi_guid_device_path,
 475                                        file_path);
 476                 if (ret != EFI_SUCCESS)
 477                         goto out;
 478         } else {
 479                 file_path = efi_dp_append(bootefi_device_path,
 480                                           bootefi_image_path);
 481         }
 482
 483         ret = EFI_CALL(efi_load_image(false, efi_root, file_path, source_buffer,
 484                                       source_size, &handle));
 485         if (ret != EFI_SUCCESS)
 486                 goto out;
 487
 488         ret = do_bootefi_exec(handle);
 489
 490 out:
 491         efi_delete_handle(mem_handle);
 492         efi_free_pool(file_path);
 493         return ret;
 494 }
 495
 496 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
 497 static efi_status_t bootefi_run_prepare(const char *load_options_path,
 498                 struct efi_device_path *device_path,
 499                 struct efi_device_path *image_path,
 500                 struct efi_loaded_image_obj **image_objp,
 501                 struct efi_loaded_image **loaded_image_infop)
 502 {
 503         efi_status_t ret;
 504         u16 *load_options;
 505
 506         ret = efi_setup_loaded_image(device_path, image_path, image_objp,
 507                                      loaded_image_infop);
 508         if (ret != EFI_SUCCESS)
 509                 return ret;
 510
 511         /* Transfer environment variable as load options */
 512         return set_load_options((efi_handle_t)*image_objp, load_options_path,
 513                                 &load_options);
 514 }
 515
 516 /**
 517  * bootefi_test_prepare() - prepare to run an EFI test
 518  *
 519  * Prepare to run a test as if it were provided by a loaded image.
 520  *
 521  * @image_objp:         pointer to be set to the loaded image handle
 522  * @loaded_image_infop: pointer to be set to the loaded image protocol
 523  * @path:               dummy file path used to construct the device path
 524  *                      set in the loaded image protocol
 525  * @load_options_path:  name of a U-Boot environment variable. Its value is
 526  *                      set as load options in the loaded image protocol.
 527  * Return:              status code
 528  */
 529 static efi_status_t bootefi_test_prepare
 530                 (struct efi_loaded_image_obj **image_objp,
 531                  struct efi_loaded_image **loaded_image_infop, const char *path,
 532                  const char *load_options_path)
 533 {
 534         efi_status_t ret;
 535
 536         /* Construct a dummy device path */
 537         bootefi_device_path = efi_dp_from_mem(EFI_RESERVED_MEMORY_TYPE, 0, 0);
 538         if (!bootefi_device_path)
 539                 return EFI_OUT_OF_RESOURCES;
 540
 541         bootefi_image_path = efi_dp_from_file(NULL, 0, path);
 542         if (!bootefi_image_path) {
 543                 ret = EFI_OUT_OF_RESOURCES;
 544                 goto failure;
 545         }
 546
 547         ret = bootefi_run_prepare(load_options_path, bootefi_device_path,
 548                                   bootefi_image_path, image_objp,
 549                                   loaded_image_infop);
 550         if (ret == EFI_SUCCESS)
 551                 return ret;
 552
 553         efi_free_pool(bootefi_image_path);
 554         bootefi_image_path = NULL;
 555 failure:
 556         efi_free_pool(bootefi_device_path);
 557         bootefi_device_path = NULL;
 558         return ret;
 559 }
 560
 561 /**
 562  * bootefi_run_finish() - finish up after running an EFI test
 563  *
 564  * @loaded_image_info: Pointer to a struct which holds the loaded image info
 565  * @image_obj: Pointer to a struct which holds the loaded image object
 566  */
 567 static void bootefi_run_finish(struct efi_loaded_image_obj *image_obj,
 568                                struct efi_loaded_image *loaded_image_info)
 569 {
 570         efi_restore_gd();
 571         free(loaded_image_info->load_options);
 572         efi_delete_handle(&image_obj->header);
 573 }
 574
 575 /**
 576  * do_efi_selftest() - execute EFI selftest
 577  *
 578  * Return:      status code
 579  */
 580 static int do_efi_selftest(void)
 581 {
 582         struct efi_loaded_image_obj *image_obj;
 583         struct efi_loaded_image *loaded_image_info;
 584         efi_status_t ret;
 585
 586         ret = bootefi_test_prepare(&image_obj, &loaded_image_info,
 587                                    "\\selftest", "efi_selftest");
 588         if (ret != EFI_SUCCESS)
 589                 return CMD_RET_FAILURE;
 590
 591         /* Execute the test */
 592         ret = EFI_CALL(efi_selftest(&image_obj->header, &systab));
 593         bootefi_run_finish(image_obj, loaded_image_info);
 594
 595         return ret != EFI_SUCCESS;
 596 }
 597 #endif /* CONFIG_CMD_BOOTEFI_SELFTEST */
 598
 599 /**
 600  * do_bootefi() - execute `bootefi` command
 601  *
 602  * @cmdtp:      table entry describing command
 603  * @flag:       bitmap indicating how the command was invoked
 604  * @argc:       number of arguments
 605  * @argv:       command line arguments
 606  * Return:      status code
 607  */
 608 static int do_bootefi(struct cmd_tbl *cmdtp, int flag, int argc,
 609                       char *const argv[])
 610 {
 611         efi_status_t ret;
 612         void *fdt;
 613
 614         if (argc < 2)
 615                 return CMD_RET_USAGE;
 616
 617         /* Initialize EFI drivers */
 618         ret = efi_init_obj_list();
 619         if (ret != EFI_SUCCESS) {
 620                 log_err("Error: Cannot initialize UEFI sub-system, r = %lu\n",
 621                         ret & ~EFI_ERROR_MASK);
 622                 return CMD_RET_FAILURE;
 623         }
 624
 625         if (argc > 2) {
 626                 uintptr_t fdt_addr;
 627
 628                 fdt_addr = simple_strtoul(argv[2], NULL, 16);
 629                 fdt = map_sysmem(fdt_addr, 0);
 630         } else {
 631                 fdt = EFI_FDT_USE_INTERNAL;
 632         }
 633         ret = efi_install_fdt(fdt);
 634         if (ret == EFI_INVALID_PARAMETER)
 635                 return CMD_RET_USAGE;
 636         else if (ret != EFI_SUCCESS)
 637                 return CMD_RET_FAILURE;
 638
 639         if (!strcmp(argv[1], "bootmgr"))
 640                 return do_efibootmgr();
 641 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
 642         else if (!strcmp(argv[1], "selftest"))
 643                 return do_efi_selftest();
 644 #endif
 645
 646         return do_bootefi_image(argv[1]);
 647 }
 648
 649 #ifdef CONFIG_SYS_LONGHELP
 650 static char bootefi_help_text[] =
 651         "<image address> [fdt address]\n"
 652         "  - boot EFI payload stored at address <image address>.\n"
 653         "    If specified, the device tree located at <fdt address> gets\n"
 654         "    exposed as EFI configuration table.\n"
 655 #ifdef CONFIG_CMD_BOOTEFI_HELLO
 656         "bootefi hello\n"
 657         "  - boot a sample Hello World application stored within U-Boot\n"
 658 #endif
 659 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
 660         "bootefi selftest [fdt address]\n"
 661         "  - boot an EFI selftest application stored within U-Boot\n"
 662         "    Use environment variable efi_selftest to select a single test.\n"
 663         "    Use 'setenv efi_selftest list' to enumerate all tests.\n"
 664 #endif
 665         "bootefi bootmgr [fdt address]\n"
 666         "  - load and boot EFI payload based on BootOrder/BootXXXX variables.\n"
 667         "\n"
 668         "    If specified, the device tree located at <fdt address> gets\n"
 669         "    exposed as EFI configuration table.\n";
 670 #endif
 671
 672 U_BOOT_CMD(
 673         bootefi, 3, 0, do_bootefi,
 674         "Boots an EFI payload from memory",
 675         bootefi_help_text
 676 );
 677
 678 /**
 679  * efi_set_bootdev() - set boot device
 680  *
 681  * This function is called when a file is loaded, e.g. via the 'load' command.
 682  * We use the path to this file to inform the UEFI binary about the boot device.
 683  *
 684  * @dev:        device, e.g. "MMC"
 685  * @devnr:      number of the device, e.g. "1:2"
 686  * @path:       path to file loaded
 687  */
 688 void efi_set_bootdev(const char *dev, const char *devnr, const char *path)
 689 {
 690         struct efi_device_path *device, *image;
 691         efi_status_t ret;
 692
 693         /* efi_set_bootdev is typically called repeatedly, recover memory */
 694         efi_free_pool(bootefi_device_path);
 695         efi_free_pool(bootefi_image_path);
 696
 697         ret = efi_dp_from_name(dev, devnr, path, &device, &image);
 698         if (ret == EFI_SUCCESS) {
 699                 bootefi_device_path = device;
 700                 if (image) {
 701                         /* FIXME: image should not contain device */
 702                         struct efi_device_path *image_tmp = image;
 703
 704                         efi_dp_split_file_path(image, &device, &image);
 705                         efi_free_pool(image_tmp);
 706                 }
 707                 bootefi_image_path = image;
 708         } else {
 709                 bootefi_device_path = NULL;
 710                 bootefi_image_path = NULL;
 711         }
 712 }