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 <bootm.h>
  12 #include <charset.h>
  13 #include <command.h>
  14 #include <dm.h>
  15 #include <efi_loader.h>
  16 #include <efi_selftest.h>
  17 #include <env.h>
  18 #include <errno.h>
  19 #include <image.h>
  20 #include <log.h>
  21 #include <malloc.h>
  22 #include <asm/global_data.h>
  23 #include <linux/libfdt.h>
  24 #include <linux/libfdt_env.h>
  25 #include <mapmem.h>
  26 #include <memalign.h>
  27 #include <asm-generic/sections.h>
  28 #include <linux/linkage.h>
  29
  30 DECLARE_GLOBAL_DATA_PTR;
  31
  32 static struct efi_device_path *bootefi_image_path;
  33 static struct efi_device_path *bootefi_device_path;
  34 static void *image_addr;
  35 static size_t image_size;
  36
  37 /**
  38  * efi_clear_bootdev() - clear boot device
  39  */
  40 static void efi_clear_bootdev(void)
  41 {
  42         efi_free_pool(bootefi_device_path);
  43         efi_free_pool(bootefi_image_path);
  44         bootefi_device_path = NULL;
  45         bootefi_image_path = NULL;
  46         image_addr = NULL;
  47         image_size = 0;
  48 }
  49
  50 /**
  51  * efi_set_bootdev() - set boot device
  52  *
  53  * This function is called when a file is loaded, e.g. via the 'load' command.
  54  * We use the path to this file to inform the UEFI binary about the boot device.
  55  *
  56  * @dev:                device, e.g. "MMC"
  57  * @devnr:              number of the device, e.g. "1:2"
  58  * @path:               path to file loaded
  59  * @buffer:             buffer with file loaded
  60  * @buffer_size:        size of file loaded
  61  */
  62 void efi_set_bootdev(const char *dev, const char *devnr, const char *path,
  63                      void *buffer, size_t buffer_size)
  64 {
  65         struct efi_device_path *device, *image;
  66         efi_status_t ret;
  67
  68         /* Forget overwritten image */
  69         if (buffer + buffer_size >= image_addr &&
  70             image_addr + image_size >= buffer)
  71                 efi_clear_bootdev();
  72
  73         /* Remember only PE-COFF and FIT images */
  74         if (efi_check_pe(buffer, buffer_size, NULL) != EFI_SUCCESS) {
  75 #ifdef CONFIG_FIT
  76                 if (fit_check_format(buffer, IMAGE_SIZE_INVAL))
  77                         return;
  78                 /*
  79                  * FIT images of type EFI_OS are started via command bootm.
  80                  * We should not use their boot device with the bootefi command.
  81                  */
  82                 buffer = 0;
  83                 buffer_size = 0;
  84 #else
  85                 return;
  86 #endif
  87         }
  88
  89         /* efi_set_bootdev() is typically called repeatedly, recover memory */
  90         efi_clear_bootdev();
  91
  92         image_addr = buffer;
  93         image_size = buffer_size;
  94
  95         ret = efi_dp_from_name(dev, devnr, path, &device, &image);
  96         if (ret == EFI_SUCCESS) {
  97                 bootefi_device_path = device;
  98                 if (image) {
  99                         /* FIXME: image should not contain device */
 100                         struct efi_device_path *image_tmp = image;
 101
 102                         efi_dp_split_file_path(image, &device, &image);
 103                         efi_free_pool(image_tmp);
 104                 }
 105                 bootefi_image_path = image;
 106         } else {
 107                 efi_clear_bootdev();
 108         }
 109 }
 110
 111 /**
 112  * efi_env_set_load_options() - set load options from environment variable
 113  *
 114  * @handle:             the image handle
 115  * @env_var:            name of the environment variable
 116  * @load_options:       pointer to load options (output)
 117  * Return:              status code
 118  */
 119 static efi_status_t efi_env_set_load_options(efi_handle_t handle,
 120                                              const char *env_var,
 121                                              u16 **load_options)
 122 {
 123         const char *env = env_get(env_var);
 124         size_t size;
 125         u16 *pos;
 126         efi_status_t ret;
 127
 128         *load_options = NULL;
 129         if (!env)
 130                 return EFI_SUCCESS;
 131         size = sizeof(u16) * (utf8_utf16_strlen(env) + 1);
 132         pos = calloc(size, 1);
 133         if (!pos)
 134                 return EFI_OUT_OF_RESOURCES;
 135         *load_options = pos;
 136         utf8_utf16_strcpy(&pos, env);
 137         ret = efi_set_load_options(handle, size, *load_options);
 138         if (ret != EFI_SUCCESS) {
 139                 free(*load_options);
 140                 *load_options = NULL;
 141         }
 142         return ret;
 143 }
 144
 145 #if !CONFIG_IS_ENABLED(GENERATE_ACPI_TABLE)
 146
 147 /**
 148  * copy_fdt() - Copy the device tree to a new location available to EFI
 149  *
 150  * The FDT is copied to a suitable location within the EFI memory map.
 151  * Additional 12 KiB are added to the space in case the device tree needs to be
 152  * expanded later with fdt_open_into().
 153  *
 154  * @fdtp:       On entry a pointer to the flattened device tree.
 155  *              On exit a pointer to the copy of the flattened device tree.
 156  *              FDT start
 157  * Return:      status code
 158  */
 159 static efi_status_t copy_fdt(void **fdtp)
 160 {
 161         unsigned long fdt_ram_start = -1L, fdt_pages;
 162         efi_status_t ret = 0;
 163         void *fdt, *new_fdt;
 164         u64 new_fdt_addr;
 165         uint fdt_size;
 166         int i;
 167
 168         for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
 169                 u64 ram_start = gd->bd->bi_dram[i].start;
 170                 u64 ram_size = gd->bd->bi_dram[i].size;
 171
 172                 if (!ram_size)
 173                         continue;
 174
 175                 if (ram_start < fdt_ram_start)
 176                         fdt_ram_start = ram_start;
 177         }
 178
 179         /*
 180          * Give us at least 12 KiB of breathing room in case the device tree
 181          * needs to be expanded later.
 182          */
 183         fdt = *fdtp;
 184         fdt_pages = efi_size_in_pages(fdt_totalsize(fdt) + 0x3000);
 185         fdt_size = fdt_pages << EFI_PAGE_SHIFT;
 186
 187         /*
 188          * Safe fdt location is at 127 MiB.
 189          * On the sandbox convert from the sandbox address space.
 190          */
 191         new_fdt_addr = (uintptr_t)map_sysmem(fdt_ram_start + 0x7f00000 +
 192                                              fdt_size, 0);
 193         ret = efi_allocate_pages(EFI_ALLOCATE_MAX_ADDRESS,
 194                                  EFI_ACPI_RECLAIM_MEMORY, fdt_pages,
 195                                  &new_fdt_addr);
 196         if (ret != EFI_SUCCESS) {
 197                 /* If we can't put it there, put it somewhere */
 198                 new_fdt_addr = (ulong)memalign(EFI_PAGE_SIZE, fdt_size);
 199                 ret = efi_allocate_pages(EFI_ALLOCATE_MAX_ADDRESS,
 200                                          EFI_ACPI_RECLAIM_MEMORY, fdt_pages,
 201                                          &new_fdt_addr);
 202                 if (ret != EFI_SUCCESS) {
 203                         log_err("ERROR: Failed to reserve space for FDT\n");
 204                         goto done;
 205                 }
 206         }
 207         new_fdt = (void *)(uintptr_t)new_fdt_addr;
 208         memcpy(new_fdt, fdt, fdt_totalsize(fdt));
 209         fdt_set_totalsize(new_fdt, fdt_size);
 210
 211         *fdtp = (void *)(uintptr_t)new_fdt_addr;
 212 done:
 213         return ret;
 214 }
 215
 216 /**
 217  * get_config_table() - get configuration table
 218  *
 219  * @guid:       GUID of the configuration table
 220  * Return:      pointer to configuration table or NULL
 221  */
 222 static void *get_config_table(const efi_guid_t *guid)
 223 {
 224         size_t i;
 225
 226         for (i = 0; i < systab.nr_tables; i++) {
 227                 if (!guidcmp(guid, &systab.tables[i].guid))
 228                         return systab.tables[i].table;
 229         }
 230         return NULL;
 231 }
 232
 233 #endif /* !CONFIG_IS_ENABLED(GENERATE_ACPI_TABLE) */
 234
 235 /**
 236  * efi_install_fdt() - install device tree
 237  *
 238  * If fdt is not EFI_FDT_USE_INTERNAL, the device tree located at that memory
 239  * address will will be installed as configuration table, otherwise the device
 240  * tree located at the address indicated by environment variable fdt_addr or as
 241  * fallback fdtcontroladdr will be used.
 242  *
 243  * On architectures using ACPI tables device trees shall not be installed as
 244  * configuration table.
 245  *
 246  * @fdt:        address of device tree or EFI_FDT_USE_INTERNAL to use the
 247  *              the hardware device tree as indicated by environment variable
 248  *              fdt_addr or as fallback the internal device tree as indicated by
 249  *              the environment variable fdtcontroladdr
 250  * Return:      status code
 251  */
 252 efi_status_t efi_install_fdt(void *fdt)
 253 {
 254         /*
 255          * The EBBR spec requires that we have either an FDT or an ACPI table
 256          * but not both.
 257          */
 258 #if CONFIG_IS_ENABLED(GENERATE_ACPI_TABLE)
 259         if (fdt) {
 260                 log_err("ERROR: can't have ACPI table and device tree.\n");
 261                 return EFI_LOAD_ERROR;
 262         }
 263 #else
 264         bootm_headers_t img = { 0 };
 265         efi_status_t ret;
 266
 267         if (fdt == EFI_FDT_USE_INTERNAL) {
 268                 const char *fdt_opt;
 269                 uintptr_t fdt_addr;
 270
 271                 /* Look for device tree that is already installed */
 272                 if (get_config_table(&efi_guid_fdt))
 273                         return EFI_SUCCESS;
 274                 /* Check if there is a hardware device tree */
 275                 fdt_opt = env_get("fdt_addr");
 276                 /* Use our own device tree as fallback */
 277                 if (!fdt_opt) {
 278                         fdt_opt = env_get("fdtcontroladdr");
 279                         if (!fdt_opt) {
 280                                 log_err("ERROR: need device tree\n");
 281                                 return EFI_NOT_FOUND;
 282                         }
 283                 }
 284                 fdt_addr = simple_strtoul(fdt_opt, NULL, 16);
 285                 if (!fdt_addr) {
 286                         log_err("ERROR: invalid $fdt_addr or $fdtcontroladdr\n");
 287                         return EFI_LOAD_ERROR;
 288                 }
 289                 fdt = map_sysmem(fdt_addr, 0);
 290         }
 291
 292         /* Install device tree */
 293         if (fdt_check_header(fdt)) {
 294                 log_err("ERROR: invalid device tree\n");
 295                 return EFI_LOAD_ERROR;
 296         }
 297
 298         /* Prepare device tree for payload */
 299         ret = copy_fdt(&fdt);
 300         if (ret) {
 301                 log_err("ERROR: out of memory\n");
 302                 return EFI_OUT_OF_RESOURCES;
 303         }
 304
 305         if (image_setup_libfdt(&img, fdt, 0, NULL)) {
 306                 log_err("ERROR: failed to process device tree\n");
 307                 return EFI_LOAD_ERROR;
 308         }
 309
 310         /* Create memory reservations as indicated by the device tree */
 311         efi_carve_out_dt_rsv(fdt);
 312
 313         /* Install device tree as UEFI table */
 314         ret = efi_install_configuration_table(&efi_guid_fdt, fdt);
 315         if (ret != EFI_SUCCESS) {
 316                 log_err("ERROR: failed to install device tree\n");
 317                 return ret;
 318         }
 319 #endif /* GENERATE_ACPI_TABLE */
 320
 321         return EFI_SUCCESS;
 322 }
 323
 324 /**
 325  * do_bootefi_exec() - execute EFI binary
 326  *
 327  * The image indicated by @handle is started. When it returns the allocated
 328  * memory for the @load_options is freed.
 329  *
 330  * @handle:             handle of loaded image
 331  * @load_options:       load options
 332  * Return:              status code
 333  *
 334  * Load the EFI binary into a newly assigned memory unwinding the relocation
 335  * information, install the loaded image protocol, and call the binary.
 336  */
 337 static efi_status_t do_bootefi_exec(efi_handle_t handle, void *load_options)
 338 {
 339         efi_status_t ret;
 340         efi_uintn_t exit_data_size = 0;
 341         u16 *exit_data = NULL;
 342
 343         /* On ARM switch from EL3 or secure mode to EL2 or non-secure mode */
 344         switch_to_non_secure_mode();
 345
 346         /* Call our payload! */
 347         ret = EFI_CALL(efi_start_image(handle, &exit_data_size, &exit_data));
 348         if (ret != EFI_SUCCESS) {
 349                 log_err("## Application failed, r = %lu\n",
 350                         ret & ~EFI_ERROR_MASK);
 351                 if (exit_data) {
 352                         log_err("## %ls\n", exit_data);
 353                         efi_free_pool(exit_data);
 354                 }
 355         }
 356
 357         efi_restore_gd();
 358
 359         free(load_options);
 360
 361         return ret;
 362 }
 363
 364 /**
 365  * do_efibootmgr() - execute EFI boot manager
 366  *
 367  * Return:      status code
 368  */
 369 static int do_efibootmgr(void)
 370 {
 371         efi_handle_t handle;
 372         efi_status_t ret;
 373         void *load_options;
 374
 375         ret = efi_bootmgr_load(&handle, &load_options);
 376         if (ret != EFI_SUCCESS) {
 377                 log_notice("EFI boot manager: Cannot load any image\n");
 378                 return CMD_RET_FAILURE;
 379         }
 380
 381         ret = do_bootefi_exec(handle, load_options);
 382
 383         if (ret != EFI_SUCCESS)
 384                 return CMD_RET_FAILURE;
 385
 386         return CMD_RET_SUCCESS;
 387 }
 388
 389 /**
 390  * do_bootefi_image() - execute EFI binary
 391  *
 392  * Set up memory image for the binary to be loaded, prepare device path, and
 393  * then call do_bootefi_exec() to execute it.
 394  *
 395  * @image_opt:  string of image start address
 396  * Return:      status code
 397  */
 398 static int do_bootefi_image(const char *image_opt)
 399 {
 400         void *image_buf;
 401         unsigned long addr, size;
 402         efi_status_t ret;
 403
 404 #ifdef CONFIG_CMD_BOOTEFI_HELLO
 405         if (!strcmp(image_opt, "hello")) {
 406                 image_buf = __efi_helloworld_begin;
 407                 size = __efi_helloworld_end - __efi_helloworld_begin;
 408                 efi_clear_bootdev();
 409         } else
 410 #endif
 411         {
 412                 addr = strtoul(image_opt, NULL, 16);
 413                 /* Check that a numeric value was passed */
 414                 if (!addr)
 415                         return CMD_RET_USAGE;
 416
 417                 image_buf = map_sysmem(addr, 0);
 418
 419                 if (image_buf != image_addr) {
 420                         log_err("No UEFI binary known at %s\n", image_opt);
 421                         return CMD_RET_FAILURE;
 422                 }
 423                 size = image_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         struct efi_device_path *msg_path;
 445         efi_status_t ret;
 446         u16 *load_options;
 447
 448         if (!bootefi_device_path || !bootefi_image_path) {
 449                 /*
 450                  * Special case for efi payload not loaded from disk,
 451                  * such as 'bootefi hello' or for example payload
 452                  * loaded directly into memory via JTAG, etc:
 453                  */
 454                 file_path = efi_dp_from_mem(EFI_RESERVED_MEMORY_TYPE,
 455                                             (uintptr_t)source_buffer,
 456                                             source_size);
 457                 /*
 458                  * Make sure that device for device_path exist
 459                  * in load_image(). Otherwise, shell and grub will fail.
 460                  */
 461                 ret = efi_create_handle(&mem_handle);
 462                 if (ret != EFI_SUCCESS)
 463                         goto out;
 464
 465                 ret = efi_add_protocol(mem_handle, &efi_guid_device_path,
 466                                        file_path);
 467                 if (ret != EFI_SUCCESS)
 468                         goto out;
 469                 msg_path = file_path;
 470         } else {
 471                 file_path = efi_dp_append(bootefi_device_path,
 472                                           bootefi_image_path);
 473                 msg_path = bootefi_image_path;
 474         }
 475
 476         log_info("Booting %pD\n", msg_path);
 477
 478         ret = EFI_CALL(efi_load_image(false, efi_root, file_path, source_buffer,
 479                                       source_size, &handle));
 480         if (ret != EFI_SUCCESS) {
 481                 log_err("Loading image failed\n");
 482                 goto out;
 483         }
 484
 485         /* Transfer environment variable as load options */
 486         ret = efi_env_set_load_options(handle, "bootargs", &load_options);
 487         if (ret != EFI_SUCCESS)
 488                 goto out;
 489
 490         ret = do_bootefi_exec(handle, load_options);
 491
 492 out:
 493         efi_delete_handle(mem_handle);
 494         efi_free_pool(file_path);
 495         return ret;
 496 }
 497
 498 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
 499 static efi_status_t bootefi_run_prepare(const char *load_options_path,
 500                 struct efi_device_path *device_path,
 501                 struct efi_device_path *image_path,
 502                 struct efi_loaded_image_obj **image_objp,
 503                 struct efi_loaded_image **loaded_image_infop)
 504 {
 505         efi_status_t ret;
 506         u16 *load_options;
 507
 508         ret = efi_setup_loaded_image(device_path, image_path, image_objp,
 509                                      loaded_image_infop);
 510         if (ret != EFI_SUCCESS)
 511                 return ret;
 512
 513         /* Transfer environment variable as load options */
 514         return efi_env_set_load_options((efi_handle_t)*image_objp,
 515                                         load_options_path,
 516                                         &load_options);
 517 }
 518
 519 /**
 520  * bootefi_test_prepare() - prepare to run an EFI test
 521  *
 522  * Prepare to run a test as if it were provided by a loaded image.
 523  *
 524  * @image_objp:         pointer to be set to the loaded image handle
 525  * @loaded_image_infop: pointer to be set to the loaded image protocol
 526  * @path:               dummy file path used to construct the device path
 527  *                      set in the loaded image protocol
 528  * @load_options_path:  name of a U-Boot environment variable. Its value is
 529  *                      set as load options in the loaded image protocol.
 530  * Return:              status code
 531  */
 532 static efi_status_t bootefi_test_prepare
 533                 (struct efi_loaded_image_obj **image_objp,
 534                  struct efi_loaded_image **loaded_image_infop, const char *path,
 535                  const char *load_options_path)
 536 {
 537         efi_status_t ret;
 538
 539         /* Construct a dummy device path */
 540         bootefi_device_path = efi_dp_from_mem(EFI_RESERVED_MEMORY_TYPE, 0, 0);
 541         if (!bootefi_device_path)
 542                 return EFI_OUT_OF_RESOURCES;
 543
 544         bootefi_image_path = efi_dp_from_file(NULL, 0, path);
 545         if (!bootefi_image_path) {
 546                 ret = EFI_OUT_OF_RESOURCES;
 547                 goto failure;
 548         }
 549
 550         ret = bootefi_run_prepare(load_options_path, bootefi_device_path,
 551                                   bootefi_image_path, image_objp,
 552                                   loaded_image_infop);
 553         if (ret == EFI_SUCCESS)
 554                 return ret;
 555
 556 failure:
 557         efi_clear_bootdev();
 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 (IS_ENABLED(CONFIG_CMD_BOOTEFI_BOOTMGR)) {
 640                 if (!strcmp(argv[1], "bootmgr"))
 641                         return do_efibootmgr();
 642         }
 643 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
 644         if (!strcmp(argv[1], "selftest"))
 645                 return do_efi_selftest();
 646 #endif
 647
 648         return do_bootefi_image(argv[1]);
 649 }
 650
 651 #ifdef CONFIG_SYS_LONGHELP
 652 static char bootefi_help_text[] =
 653         "<image address> [fdt address]\n"
 654         "  - boot EFI payload stored at address <image address>.\n"
 655         "    If specified, the device tree located at <fdt address> gets\n"
 656         "    exposed as EFI configuration table.\n"
 657 #ifdef CONFIG_CMD_BOOTEFI_HELLO
 658         "bootefi hello\n"
 659         "  - boot a sample Hello World application stored within U-Boot\n"
 660 #endif
 661 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
 662         "bootefi selftest [fdt address]\n"
 663         "  - boot an EFI selftest application stored within U-Boot\n"
 664         "    Use environment variable efi_selftest to select a single test.\n"
 665         "    Use 'setenv efi_selftest list' to enumerate all tests.\n"
 666 #endif
 667 #ifdef CONFIG_CMD_BOOTEFI_BOOTMGR
 668         "bootefi bootmgr [fdt address]\n"
 669         "  - load and boot EFI payload based on BootOrder/BootXXXX variables.\n"
 670         "\n"
 671         "    If specified, the device tree located at <fdt address> gets\n"
 672         "    exposed as EFI configuration table.\n"
 673 #endif
 674         ;
 675 #endif
 676
 677 U_BOOT_CMD(
 678         bootefi, 3, 0, do_bootefi,
 679         "Boots an EFI payload from memory",
 680         bootefi_help_text
 681 );