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         log_debug("dev=%s, devnr=%s, path=%s, buffer=%p, size=%zx\n", dev,
  69                   devnr, path, buffer, buffer_size);
  70
  71         /* Forget overwritten image */
  72         if (buffer + buffer_size >= image_addr &&
  73             image_addr + image_size >= buffer)
  74                 efi_clear_bootdev();
  75
  76         /* Remember only PE-COFF and FIT images */
  77         if (efi_check_pe(buffer, buffer_size, NULL) != EFI_SUCCESS) {
  78                 if (IS_ENABLED(CONFIG_FIT) &&
  79                     !fit_check_format(buffer, IMAGE_SIZE_INVAL)) {
  80                         /*
  81                          * FIT images of type EFI_OS are started via command
  82                          * bootm. We should not use their boot device with the
  83                          * bootefi command.
  84                          */
  85                         buffer = 0;
  86                         buffer_size = 0;
  87                 } else {
  88                         log_debug("- not remembering image\n");
  89                         return;
  90                 }
  91         }
  92
  93         /* efi_set_bootdev() is typically called repeatedly, recover memory */
  94         efi_clear_bootdev();
  95
  96         image_addr = buffer;
  97         image_size = buffer_size;
  98
  99         ret = efi_dp_from_name(dev, devnr, path, &device, &image);
 100         if (ret == EFI_SUCCESS) {
 101                 bootefi_device_path = device;
 102                 if (image) {
 103                         /* FIXME: image should not contain device */
 104                         struct efi_device_path *image_tmp = image;
 105
 106                         efi_dp_split_file_path(image, &device, &image);
 107                         efi_free_pool(image_tmp);
 108                 }
 109                 bootefi_image_path = image;
 110                 log_debug("- recorded device %ls\n", efi_dp_str(device));
 111                 if (image)
 112                         log_debug("- and image %ls\n", efi_dp_str(image));
 113         } else {
 114                 log_debug("- efi_dp_from_name() failed, err=%lx\n", ret);
 115                 efi_clear_bootdev();
 116         }
 117 }
 118
 119 /**
 120  * efi_env_set_load_options() - set load options from environment variable
 121  *
 122  * @handle:             the image handle
 123  * @env_var:            name of the environment variable
 124  * @load_options:       pointer to load options (output)
 125  * Return:              status code
 126  */
 127 static efi_status_t efi_env_set_load_options(efi_handle_t handle,
 128                                              const char *env_var,
 129                                              u16 **load_options)
 130 {
 131         const char *env = env_get(env_var);
 132         size_t size;
 133         u16 *pos;
 134         efi_status_t ret;
 135
 136         *load_options = NULL;
 137         if (!env)
 138                 return EFI_SUCCESS;
 139         size = sizeof(u16) * (utf8_utf16_strlen(env) + 1);
 140         pos = calloc(size, 1);
 141         if (!pos)
 142                 return EFI_OUT_OF_RESOURCES;
 143         *load_options = pos;
 144         utf8_utf16_strcpy(&pos, env);
 145         ret = efi_set_load_options(handle, size, *load_options);
 146         if (ret != EFI_SUCCESS) {
 147                 free(*load_options);
 148                 *load_options = NULL;
 149         }
 150         return ret;
 151 }
 152
 153 #if !CONFIG_IS_ENABLED(GENERATE_ACPI_TABLE)
 154
 155 /**
 156  * copy_fdt() - Copy the device tree to a new location available to EFI
 157  *
 158  * The FDT is copied to a suitable location within the EFI memory map.
 159  * Additional 12 KiB are added to the space in case the device tree needs to be
 160  * expanded later with fdt_open_into().
 161  *
 162  * @fdtp:       On entry a pointer to the flattened device tree.
 163  *              On exit a pointer to the copy of the flattened device tree.
 164  *              FDT start
 165  * Return:      status code
 166  */
 167 static efi_status_t copy_fdt(void **fdtp)
 168 {
 169         unsigned long fdt_ram_start = -1L, fdt_pages;
 170         efi_status_t ret = 0;
 171         void *fdt, *new_fdt;
 172         u64 new_fdt_addr;
 173         uint fdt_size;
 174         int i;
 175
 176         for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
 177                 u64 ram_start = gd->bd->bi_dram[i].start;
 178                 u64 ram_size = gd->bd->bi_dram[i].size;
 179
 180                 if (!ram_size)
 181                         continue;
 182
 183                 if (ram_start < fdt_ram_start)
 184                         fdt_ram_start = ram_start;
 185         }
 186
 187         /*
 188          * Give us at least 12 KiB of breathing room in case the device tree
 189          * needs to be expanded later.
 190          */
 191         fdt = *fdtp;
 192         fdt_pages = efi_size_in_pages(fdt_totalsize(fdt) + 0x3000);
 193         fdt_size = fdt_pages << EFI_PAGE_SHIFT;
 194
 195         /*
 196          * Safe fdt location is at 127 MiB.
 197          * On the sandbox convert from the sandbox address space.
 198          */
 199         new_fdt_addr = (uintptr_t)map_sysmem(fdt_ram_start + 0x7f00000 +
 200                                              fdt_size, 0);
 201         ret = efi_allocate_pages(EFI_ALLOCATE_MAX_ADDRESS,
 202                                  EFI_ACPI_RECLAIM_MEMORY, fdt_pages,
 203                                  &new_fdt_addr);
 204         if (ret != EFI_SUCCESS) {
 205                 /* If we can't put it there, put it somewhere */
 206                 new_fdt_addr = (ulong)memalign(EFI_PAGE_SIZE, fdt_size);
 207                 ret = efi_allocate_pages(EFI_ALLOCATE_MAX_ADDRESS,
 208                                          EFI_ACPI_RECLAIM_MEMORY, fdt_pages,
 209                                          &new_fdt_addr);
 210                 if (ret != EFI_SUCCESS) {
 211                         log_err("ERROR: Failed to reserve space for FDT\n");
 212                         goto done;
 213                 }
 214         }
 215         new_fdt = (void *)(uintptr_t)new_fdt_addr;
 216         memcpy(new_fdt, fdt, fdt_totalsize(fdt));
 217         fdt_set_totalsize(new_fdt, fdt_size);
 218
 219         *fdtp = (void *)(uintptr_t)new_fdt_addr;
 220 done:
 221         return ret;
 222 }
 223
 224 /**
 225  * get_config_table() - get configuration table
 226  *
 227  * @guid:       GUID of the configuration table
 228  * Return:      pointer to configuration table or NULL
 229  */
 230 static void *get_config_table(const efi_guid_t *guid)
 231 {
 232         size_t i;
 233
 234         for (i = 0; i < systab.nr_tables; i++) {
 235                 if (!guidcmp(guid, &systab.tables[i].guid))
 236                         return systab.tables[i].table;
 237         }
 238         return NULL;
 239 }
 240
 241 #endif /* !CONFIG_IS_ENABLED(GENERATE_ACPI_TABLE) */
 242
 243 /**
 244  * efi_install_fdt() - install device tree
 245  *
 246  * If fdt is not EFI_FDT_USE_INTERNAL, the device tree located at that memory
 247  * address will will be installed as configuration table, otherwise the device
 248  * tree located at the address indicated by environment variable fdt_addr or as
 249  * fallback fdtcontroladdr will be used.
 250  *
 251  * On architectures using ACPI tables device trees shall not be installed as
 252  * configuration table.
 253  *
 254  * @fdt:        address of device tree or EFI_FDT_USE_INTERNAL to use the
 255  *              the hardware device tree as indicated by environment variable
 256  *              fdt_addr or as fallback the internal device tree as indicated by
 257  *              the environment variable fdtcontroladdr
 258  * Return:      status code
 259  */
 260 efi_status_t efi_install_fdt(void *fdt)
 261 {
 262         /*
 263          * The EBBR spec requires that we have either an FDT or an ACPI table
 264          * but not both.
 265          */
 266 #if CONFIG_IS_ENABLED(GENERATE_ACPI_TABLE)
 267         if (fdt) {
 268                 log_warning("WARNING: Can't have ACPI table and device tree - ignoring DT.\n");
 269                 return EFI_SUCCESS;
 270         }
 271 #else
 272         bootm_headers_t img = { 0 };
 273         efi_status_t ret;
 274
 275         if (fdt == EFI_FDT_USE_INTERNAL) {
 276                 const char *fdt_opt;
 277                 uintptr_t fdt_addr;
 278
 279                 /* Look for device tree that is already installed */
 280                 if (get_config_table(&efi_guid_fdt))
 281                         return EFI_SUCCESS;
 282                 /* Check if there is a hardware device tree */
 283                 fdt_opt = env_get("fdt_addr");
 284                 /* Use our own device tree as fallback */
 285                 if (!fdt_opt) {
 286                         fdt_opt = env_get("fdtcontroladdr");
 287                         if (!fdt_opt) {
 288                                 log_err("ERROR: need device tree\n");
 289                                 return EFI_NOT_FOUND;
 290                         }
 291                 }
 292                 fdt_addr = hextoul(fdt_opt, NULL);
 293                 if (!fdt_addr) {
 294                         log_err("ERROR: invalid $fdt_addr or $fdtcontroladdr\n");
 295                         return EFI_LOAD_ERROR;
 296                 }
 297                 fdt = map_sysmem(fdt_addr, 0);
 298         }
 299
 300         /* Install device tree */
 301         if (fdt_check_header(fdt)) {
 302                 log_err("ERROR: invalid device tree\n");
 303                 return EFI_LOAD_ERROR;
 304         }
 305
 306         /* Prepare device tree for payload */
 307         ret = copy_fdt(&fdt);
 308         if (ret) {
 309                 log_err("ERROR: out of memory\n");
 310                 return EFI_OUT_OF_RESOURCES;
 311         }
 312
 313         if (image_setup_libfdt(&img, fdt, 0, NULL)) {
 314                 log_err("ERROR: failed to process device tree\n");
 315                 return EFI_LOAD_ERROR;
 316         }
 317
 318         /* Create memory reservations as indicated by the device tree */
 319         efi_carve_out_dt_rsv(fdt);
 320
 321         efi_try_purge_kaslr_seed(fdt);
 322
 323         /* Install device tree as UEFI table */
 324         ret = efi_install_configuration_table(&efi_guid_fdt, fdt);
 325         if (ret != EFI_SUCCESS) {
 326                 log_err("ERROR: failed to install device tree\n");
 327                 return ret;
 328         }
 329 #endif /* GENERATE_ACPI_TABLE */
 330
 331         return EFI_SUCCESS;
 332 }
 333
 334 /**
 335  * do_bootefi_exec() - execute EFI binary
 336  *
 337  * The image indicated by @handle is started. When it returns the allocated
 338  * memory for the @load_options is freed.
 339  *
 340  * @handle:             handle of loaded image
 341  * @load_options:       load options
 342  * Return:              status code
 343  *
 344  * Load the EFI binary into a newly assigned memory unwinding the relocation
 345  * information, install the loaded image protocol, and call the binary.
 346  */
 347 static efi_status_t do_bootefi_exec(efi_handle_t handle, void *load_options)
 348 {
 349         efi_status_t ret;
 350         efi_uintn_t exit_data_size = 0;
 351         u16 *exit_data = NULL;
 352
 353         /* On ARM switch from EL3 or secure mode to EL2 or non-secure mode */
 354         switch_to_non_secure_mode();
 355
 356         /*
 357          * The UEFI standard requires that the watchdog timer is set to five
 358          * minutes when invoking an EFI boot option.
 359          *
 360          * Unified Extensible Firmware Interface (UEFI), version 2.7 Errata A
 361          * 7.5. Miscellaneous Boot Services - EFI_BOOT_SERVICES.SetWatchdogTimer
 362          */
 363         ret = efi_set_watchdog(300);
 364         if (ret != EFI_SUCCESS) {
 365                 log_err("ERROR: Failed to set watchdog timer\n");
 366                 goto out;
 367         }
 368
 369         /* Call our payload! */
 370         ret = EFI_CALL(efi_start_image(handle, &exit_data_size, &exit_data));
 371         if (ret != EFI_SUCCESS) {
 372                 log_err("## Application failed, r = %lu\n",
 373                         ret & ~EFI_ERROR_MASK);
 374                 if (exit_data) {
 375                         log_err("## %ls\n", exit_data);
 376                         efi_free_pool(exit_data);
 377                 }
 378         }
 379
 380         efi_restore_gd();
 381
 382 out:
 383         free(load_options);
 384
 385         if (IS_ENABLED(CONFIG_EFI_LOAD_FILE2_INITRD))
 386                 efi_initrd_deregister();
 387
 388         /* Control is returned to U-Boot, disable EFI watchdog */
 389         efi_set_watchdog(0);
 390
 391         return ret;
 392 }
 393
 394 /**
 395  * do_efibootmgr() - execute EFI boot manager
 396  *
 397  * Return:      status code
 398  */
 399 static int do_efibootmgr(void)
 400 {
 401         efi_handle_t handle;
 402         efi_status_t ret;
 403         void *load_options;
 404
 405         ret = efi_bootmgr_load(&handle, &load_options);
 406         if (ret != EFI_SUCCESS) {
 407                 log_notice("EFI boot manager: Cannot load any image\n");
 408                 return CMD_RET_FAILURE;
 409         }
 410
 411         ret = do_bootefi_exec(handle, load_options);
 412
 413         if (ret != EFI_SUCCESS)
 414                 return CMD_RET_FAILURE;
 415
 416         return CMD_RET_SUCCESS;
 417 }
 418
 419 /**
 420  * do_bootefi_image() - execute EFI binary
 421  *
 422  * Set up memory image for the binary to be loaded, prepare device path, and
 423  * then call do_bootefi_exec() to execute it.
 424  *
 425  * @image_opt:  string with image start address
 426  * @size_opt:   string with image size or NULL
 427  * Return:      status code
 428  */
 429 static int do_bootefi_image(const char *image_opt, const char *size_opt)
 430 {
 431         void *image_buf;
 432         unsigned long addr, size;
 433         efi_status_t ret;
 434
 435 #ifdef CONFIG_CMD_BOOTEFI_HELLO
 436         if (!strcmp(image_opt, "hello")) {
 437                 image_buf = __efi_helloworld_begin;
 438                 size = __efi_helloworld_end - __efi_helloworld_begin;
 439                 efi_clear_bootdev();
 440         } else
 441 #endif
 442         {
 443                 addr = strtoul(image_opt, NULL, 16);
 444                 /* Check that a numeric value was passed */
 445                 if (!addr)
 446                         return CMD_RET_USAGE;
 447                 image_buf = map_sysmem(addr, 0);
 448
 449                 if (size_opt) {
 450                         size = strtoul(size_opt, NULL, 16);
 451                         if (!size)
 452                                 return CMD_RET_USAGE;
 453                         efi_clear_bootdev();
 454                 } else {
 455                         if (image_buf != image_addr) {
 456                                 log_err("No UEFI binary known at %s\n",
 457                                         image_opt);
 458                                 return CMD_RET_FAILURE;
 459                         }
 460                         size = image_size;
 461                 }
 462         }
 463         ret = efi_run_image(image_buf, size);
 464
 465         if (ret != EFI_SUCCESS)
 466                 return CMD_RET_FAILURE;
 467
 468         return CMD_RET_SUCCESS;
 469 }
 470
 471 /**
 472  * efi_run_image() - run loaded UEFI image
 473  *
 474  * @source_buffer:      memory address of the UEFI image
 475  * @source_size:        size of the UEFI image
 476  * Return:              status code
 477  */
 478 efi_status_t efi_run_image(void *source_buffer, efi_uintn_t source_size)
 479 {
 480         efi_handle_t mem_handle = NULL, handle;
 481         struct efi_device_path *file_path = NULL;
 482         struct efi_device_path *msg_path;
 483         efi_status_t ret;
 484         u16 *load_options;
 485
 486         if (!bootefi_device_path || !bootefi_image_path) {
 487                 log_debug("Not loaded from disk\n");
 488                 /*
 489                  * Special case for efi payload not loaded from disk,
 490                  * such as 'bootefi hello' or for example payload
 491                  * loaded directly into memory via JTAG, etc:
 492                  */
 493                 file_path = efi_dp_from_mem(EFI_RESERVED_MEMORY_TYPE,
 494                                             (uintptr_t)source_buffer,
 495                                             source_size);
 496                 /*
 497                  * Make sure that device for device_path exist
 498                  * in load_image(). Otherwise, shell and grub will fail.
 499                  */
 500                 ret = efi_create_handle(&mem_handle);
 501                 if (ret != EFI_SUCCESS)
 502                         goto out;
 503
 504                 ret = efi_add_protocol(mem_handle, &efi_guid_device_path,
 505                                        file_path);
 506                 if (ret != EFI_SUCCESS)
 507                         goto out;
 508                 msg_path = file_path;
 509         } else {
 510                 file_path = efi_dp_append(bootefi_device_path,
 511                                           bootefi_image_path);
 512                 msg_path = bootefi_image_path;
 513                 log_debug("Loaded from disk\n");
 514         }
 515
 516         log_info("Booting %pD\n", msg_path);
 517
 518         ret = EFI_CALL(efi_load_image(false, efi_root, file_path, source_buffer,
 519                                       source_size, &handle));
 520         if (ret != EFI_SUCCESS) {
 521                 log_err("Loading image failed\n");
 522                 goto out;
 523         }
 524
 525         /* Transfer environment variable as load options */
 526         ret = efi_env_set_load_options(handle, "bootargs", &load_options);
 527         if (ret != EFI_SUCCESS)
 528                 goto out;
 529
 530         ret = do_bootefi_exec(handle, load_options);
 531
 532 out:
 533         efi_delete_handle(mem_handle);
 534         efi_free_pool(file_path);
 535         return ret;
 536 }
 537
 538 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
 539 static efi_status_t bootefi_run_prepare(const char *load_options_path,
 540                 struct efi_device_path *device_path,
 541                 struct efi_device_path *image_path,
 542                 struct efi_loaded_image_obj **image_objp,
 543                 struct efi_loaded_image **loaded_image_infop)
 544 {
 545         efi_status_t ret;
 546         u16 *load_options;
 547
 548         ret = efi_setup_loaded_image(device_path, image_path, image_objp,
 549                                      loaded_image_infop);
 550         if (ret != EFI_SUCCESS)
 551                 return ret;
 552
 553         /* Transfer environment variable as load options */
 554         return efi_env_set_load_options((efi_handle_t)*image_objp,
 555                                         load_options_path,
 556                                         &load_options);
 557 }
 558
 559 /**
 560  * bootefi_test_prepare() - prepare to run an EFI test
 561  *
 562  * Prepare to run a test as if it were provided by a loaded image.
 563  *
 564  * @image_objp:         pointer to be set to the loaded image handle
 565  * @loaded_image_infop: pointer to be set to the loaded image protocol
 566  * @path:               dummy file path used to construct the device path
 567  *                      set in the loaded image protocol
 568  * @load_options_path:  name of a U-Boot environment variable. Its value is
 569  *                      set as load options in the loaded image protocol.
 570  * Return:              status code
 571  */
 572 static efi_status_t bootefi_test_prepare
 573                 (struct efi_loaded_image_obj **image_objp,
 574                  struct efi_loaded_image **loaded_image_infop, const char *path,
 575                  const char *load_options_path)
 576 {
 577         efi_status_t ret;
 578
 579         /* Construct a dummy device path */
 580         bootefi_device_path = efi_dp_from_mem(EFI_RESERVED_MEMORY_TYPE, 0, 0);
 581         if (!bootefi_device_path)
 582                 return EFI_OUT_OF_RESOURCES;
 583
 584         bootefi_image_path = efi_dp_from_file(NULL, 0, path);
 585         if (!bootefi_image_path) {
 586                 ret = EFI_OUT_OF_RESOURCES;
 587                 goto failure;
 588         }
 589
 590         ret = bootefi_run_prepare(load_options_path, bootefi_device_path,
 591                                   bootefi_image_path, image_objp,
 592                                   loaded_image_infop);
 593         if (ret == EFI_SUCCESS)
 594                 return ret;
 595
 596 failure:
 597         efi_clear_bootdev();
 598         return ret;
 599 }
 600
 601 /**
 602  * bootefi_run_finish() - finish up after running an EFI test
 603  *
 604  * @loaded_image_info: Pointer to a struct which holds the loaded image info
 605  * @image_obj: Pointer to a struct which holds the loaded image object
 606  */
 607 static void bootefi_run_finish(struct efi_loaded_image_obj *image_obj,
 608                                struct efi_loaded_image *loaded_image_info)
 609 {
 610         efi_restore_gd();
 611         free(loaded_image_info->load_options);
 612         efi_delete_handle(&image_obj->header);
 613 }
 614
 615 /**
 616  * do_efi_selftest() - execute EFI selftest
 617  *
 618  * Return:      status code
 619  */
 620 static int do_efi_selftest(void)
 621 {
 622         struct efi_loaded_image_obj *image_obj;
 623         struct efi_loaded_image *loaded_image_info;
 624         efi_status_t ret;
 625
 626         ret = bootefi_test_prepare(&image_obj, &loaded_image_info,
 627                                    "\\selftest", "efi_selftest");
 628         if (ret != EFI_SUCCESS)
 629                 return CMD_RET_FAILURE;
 630
 631         /* Execute the test */
 632         ret = EFI_CALL(efi_selftest(&image_obj->header, &systab));
 633         bootefi_run_finish(image_obj, loaded_image_info);
 634
 635         return ret != EFI_SUCCESS;
 636 }
 637 #endif /* CONFIG_CMD_BOOTEFI_SELFTEST */
 638
 639 /**
 640  * do_bootefi() - execute `bootefi` command
 641  *
 642  * @cmdtp:      table entry describing command
 643  * @flag:       bitmap indicating how the command was invoked
 644  * @argc:       number of arguments
 645  * @argv:       command line arguments
 646  * Return:      status code
 647  */
 648 static int do_bootefi(struct cmd_tbl *cmdtp, int flag, int argc,
 649                       char *const argv[])
 650 {
 651         efi_status_t ret;
 652         void *fdt;
 653
 654         if (argc < 2)
 655                 return CMD_RET_USAGE;
 656
 657         /* Initialize EFI drivers */
 658         ret = efi_init_obj_list();
 659         if (ret != EFI_SUCCESS) {
 660                 log_err("Error: Cannot initialize UEFI sub-system, r = %lu\n",
 661                         ret & ~EFI_ERROR_MASK);
 662                 return CMD_RET_FAILURE;
 663         }
 664
 665         if (argc > 2 && strcmp(argv[2], "-")) {
 666                 uintptr_t fdt_addr;
 667
 668                 fdt_addr = hextoul(argv[2], NULL);
 669                 fdt = map_sysmem(fdt_addr, 0);
 670         } else {
 671                 fdt = EFI_FDT_USE_INTERNAL;
 672         }
 673         ret = efi_install_fdt(fdt);
 674         if (ret == EFI_INVALID_PARAMETER)
 675                 return CMD_RET_USAGE;
 676         else if (ret != EFI_SUCCESS)
 677                 return CMD_RET_FAILURE;
 678
 679         if (IS_ENABLED(CONFIG_CMD_BOOTEFI_BOOTMGR)) {
 680                 if (!strcmp(argv[1], "bootmgr"))
 681                         return do_efibootmgr();
 682         }
 683 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
 684         if (!strcmp(argv[1], "selftest"))
 685                 return do_efi_selftest();
 686 #endif
 687
 688         return do_bootefi_image(argv[1], argc > 3 ? argv[3] : NULL);
 689 }
 690
 691 #ifdef CONFIG_SYS_LONGHELP
 692 static char bootefi_help_text[] =
 693         "<image address> [fdt address [image size]]\n"
 694         "  - boot EFI payload stored at <image address>\n"
 695         "    fdt address, address of device-tree or '-'\n"
 696         "    image size, required if image not preloaded\n"
 697 #ifdef CONFIG_CMD_BOOTEFI_HELLO
 698         "bootefi hello\n"
 699         "  - boot a sample Hello World application stored within U-Boot\n"
 700 #endif
 701 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
 702         "bootefi selftest [fdt address]\n"
 703         "  - boot an EFI selftest application stored within U-Boot\n"
 704         "    Use environment variable efi_selftest to select a single test.\n"
 705         "    Use 'setenv efi_selftest list' to enumerate all tests.\n"
 706 #endif
 707 #ifdef CONFIG_CMD_BOOTEFI_BOOTMGR
 708         "bootefi bootmgr [fdt address]\n"
 709         "  - load and boot EFI payload based on BootOrder/BootXXXX variables.\n"
 710         "\n"
 711         "    If specified, the device tree located at <fdt address> gets\n"
 712         "    exposed as EFI configuration table.\n"
 713 #endif
 714         ;
 715 #endif
 716
 717 U_BOOT_CMD(
 718         bootefi, 4, 0, do_bootefi,
 719         "Boots an EFI payload from memory",
 720         bootefi_help_text
 721 );