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 <bootm.h>
  10 #include <charset.h>
  11 #include <command.h>
  12 #include <dm.h>
  13 #include <efi_loader.h>
  14 #include <efi_selftest.h>
  15 #include <errno.h>
  16 #include <linux/libfdt.h>
  17 #include <linux/libfdt_env.h>
  18 #include <mapmem.h>
  19 #include <memalign.h>
  20 #include <asm/global_data.h>
  21 #include <asm-generic/sections.h>
  22 #include <asm-generic/unaligned.h>
  23 #include <linux/linkage.h>
  24
  25 DECLARE_GLOBAL_DATA_PTR;
  26
  27 static struct efi_device_path *bootefi_image_path;
  28 static struct efi_device_path *bootefi_device_path;
  29
  30 /*
  31  * Allow unaligned memory access.
  32  *
  33  * This routine is overridden by architectures providing this feature.
  34  */
  35 void __weak allow_unaligned(void)
  36 {
  37 }
  38
  39 /*
  40  * Set the load options of an image from an environment variable.
  41  *
  42  * @handle:     the image handle
  43  * @env_var:    name of the environment variable
  44  * Return:      status code
  45  */
  46 static efi_status_t set_load_options(efi_handle_t handle, const char *env_var)
  47 {
  48         struct efi_loaded_image *loaded_image_info;
  49         size_t size;
  50         const char *env = env_get(env_var);
  51         u16 *pos;
  52         efi_status_t ret;
  53
  54         ret = EFI_CALL(systab.boottime->open_protocol(
  55                                         handle,
  56                                         &efi_guid_loaded_image,
  57                                         (void **)&loaded_image_info,
  58                                         efi_root, NULL,
  59                                         EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL));
  60         if (ret != EFI_SUCCESS)
  61                 return EFI_INVALID_PARAMETER;
  62
  63         loaded_image_info->load_options = NULL;
  64         loaded_image_info->load_options_size = 0;
  65         if (!env)
  66                 goto out;
  67
  68         size = utf8_utf16_strlen(env) + 1;
  69         loaded_image_info->load_options = calloc(size, sizeof(u16));
  70         if (!loaded_image_info->load_options) {
  71                 printf("ERROR: Out of memory\n");
  72                 EFI_CALL(systab.boottime->close_protocol(handle,
  73                                                          &efi_guid_loaded_image,
  74                                                          efi_root, NULL));
  75                 return EFI_OUT_OF_RESOURCES;
  76         }
  77         pos = loaded_image_info->load_options;
  78         utf8_utf16_strcpy(&pos, env);
  79         loaded_image_info->load_options_size = size * 2;
  80
  81 out:
  82         return EFI_CALL(systab.boottime->close_protocol(handle,
  83                                                         &efi_guid_loaded_image,
  84                                                         efi_root, NULL));
  85 }
  86
  87 #if !CONFIG_IS_ENABLED(GENERATE_ACPI_TABLE)
  88
  89 /**
  90  * copy_fdt() - Copy the device tree to a new location available to EFI
  91  *
  92  * The FDT is copied to a suitable location within the EFI memory map.
  93  * Additional 12 KiB are added to the space in case the device tree needs to be
  94  * expanded later with fdt_open_into().
  95  *
  96  * @fdtp:       On entry a pointer to the flattened device tree.
  97  *              On exit a pointer to the copy of the flattened device tree.
  98  *              FDT start
  99  * Return:      status code
 100  */
 101 static efi_status_t copy_fdt(void **fdtp)
 102 {
 103         unsigned long fdt_ram_start = -1L, fdt_pages;
 104         efi_status_t ret = 0;
 105         void *fdt, *new_fdt;
 106         u64 new_fdt_addr;
 107         uint fdt_size;
 108         int i;
 109
 110         for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
 111                 u64 ram_start = gd->bd->bi_dram[i].start;
 112                 u64 ram_size = gd->bd->bi_dram[i].size;
 113
 114                 if (!ram_size)
 115                         continue;
 116
 117                 if (ram_start < fdt_ram_start)
 118                         fdt_ram_start = ram_start;
 119         }
 120
 121         /*
 122          * Give us at least 12 KiB of breathing room in case the device tree
 123          * needs to be expanded later.
 124          */
 125         fdt = *fdtp;
 126         fdt_pages = efi_size_in_pages(fdt_totalsize(fdt) + 0x3000);
 127         fdt_size = fdt_pages << EFI_PAGE_SHIFT;
 128
 129         /*
 130          * Safe fdt location is at 127 MiB.
 131          * On the sandbox convert from the sandbox address space.
 132          */
 133         new_fdt_addr = (uintptr_t)map_sysmem(fdt_ram_start + 0x7f00000 +
 134                                              fdt_size, 0);
 135         ret = efi_allocate_pages(EFI_ALLOCATE_MAX_ADDRESS,
 136                                  EFI_BOOT_SERVICES_DATA, fdt_pages,
 137                                  &new_fdt_addr);
 138         if (ret != EFI_SUCCESS) {
 139                 /* If we can't put it there, put it somewhere */
 140                 new_fdt_addr = (ulong)memalign(EFI_PAGE_SIZE, fdt_size);
 141                 ret = efi_allocate_pages(EFI_ALLOCATE_MAX_ADDRESS,
 142                                          EFI_BOOT_SERVICES_DATA, fdt_pages,
 143                                          &new_fdt_addr);
 144                 if (ret != EFI_SUCCESS) {
 145                         printf("ERROR: Failed to reserve space for FDT\n");
 146                         goto done;
 147                 }
 148         }
 149         new_fdt = (void *)(uintptr_t)new_fdt_addr;
 150         memcpy(new_fdt, fdt, fdt_totalsize(fdt));
 151         fdt_set_totalsize(new_fdt, fdt_size);
 152
 153         *fdtp = (void *)(uintptr_t)new_fdt_addr;
 154 done:
 155         return ret;
 156 }
 157
 158 /*
 159  * efi_carve_out_dt_rsv() - Carve out DT reserved memory ranges
 160  *
 161  * The mem_rsv entries of the FDT are added to the memory map. Any failures are
 162  * ignored because this is not critical and we would rather continue to try to
 163  * boot.
 164  *
 165  * @fdt: Pointer to device tree
 166  */
 167 static void efi_carve_out_dt_rsv(void *fdt)
 168 {
 169         int nr_rsv, i;
 170         uint64_t addr, size, pages;
 171
 172         nr_rsv = fdt_num_mem_rsv(fdt);
 173
 174         /* Look for an existing entry and add it to the efi mem map. */
 175         for (i = 0; i < nr_rsv; i++) {
 176                 if (fdt_get_mem_rsv(fdt, i, &addr, &size) != 0)
 177                         continue;
 178
 179                 /* Convert from sandbox address space. */
 180                 addr = (uintptr_t)map_sysmem(addr, 0);
 181
 182                 pages = efi_size_in_pages(size + (addr & EFI_PAGE_MASK));
 183                 addr &= ~EFI_PAGE_MASK;
 184                 if (!efi_add_memory_map(addr, pages, EFI_RESERVED_MEMORY_TYPE,
 185                                         false))
 186                         printf("FDT memrsv map %d: Failed to add to map\n", i);
 187         }
 188 }
 189
 190 /**
 191  * get_config_table() - get configuration table
 192  *
 193  * @guid:       GUID of the configuration table
 194  * Return:      pointer to configuration table or NULL
 195  */
 196 static void *get_config_table(const efi_guid_t *guid)
 197 {
 198         size_t i;
 199
 200         for (i = 0; i < systab.nr_tables; i++) {
 201                 if (!guidcmp(guid, &systab.tables[i].guid))
 202                         return systab.tables[i].table;
 203         }
 204         return NULL;
 205 }
 206
 207 #endif /* !CONFIG_IS_ENABLED(GENERATE_ACPI_TABLE) */
 208
 209 /**
 210  * efi_install_fdt() - install fdt passed by a command argument
 211  * @fdt_opt:    pointer to argument
 212  * Return:      status code
 213  *
 214  * If specified, fdt will be installed as configuration table,
 215  * otherwise no fdt will be passed.
 216  */
 217 static efi_status_t efi_install_fdt(const char *fdt_opt)
 218 {
 219         /*
 220          * The EBBR spec requires that we have either an FDT or an ACPI table
 221          * but not both.
 222          */
 223 #if CONFIG_IS_ENABLED(GENERATE_ACPI_TABLE)
 224         if (fdt_opt) {
 225                 printf("ERROR: can't have ACPI table and device tree.\n");
 226                 return EFI_LOAD_ERROR;
 227         }
 228 #else
 229         unsigned long fdt_addr;
 230         void *fdt;
 231         bootm_headers_t img = { 0 };
 232         efi_status_t ret;
 233
 234         if (fdt_opt) {
 235                 fdt_addr = simple_strtoul(fdt_opt, NULL, 16);
 236                 if (!fdt_addr)
 237                         return EFI_INVALID_PARAMETER;
 238         } else {
 239                 /* Look for device tree that is already installed */
 240                 if (get_config_table(&efi_guid_fdt))
 241                         return EFI_SUCCESS;
 242                 /* Use our own device tree as default */
 243                 fdt_opt = env_get("fdtcontroladdr");
 244                 if (!fdt_opt) {
 245                         printf("ERROR: need device tree\n");
 246                         return EFI_NOT_FOUND;
 247                 }
 248                 fdt_addr = simple_strtoul(fdt_opt, NULL, 16);
 249                 if (!fdt_addr) {
 250                         printf("ERROR: invalid $fdtcontroladdr\n");
 251                         return EFI_LOAD_ERROR;
 252                 }
 253         }
 254
 255         /* Install device tree */
 256         fdt = map_sysmem(fdt_addr, 0);
 257         if (fdt_check_header(fdt)) {
 258                 printf("ERROR: invalid device tree\n");
 259                 return EFI_LOAD_ERROR;
 260         }
 261
 262         /* Create memory reservations as indicated by the device tree */
 263         efi_carve_out_dt_rsv(fdt);
 264
 265         /* Prepare device tree for payload */
 266         ret = copy_fdt(&fdt);
 267         if (ret) {
 268                 printf("ERROR: out of memory\n");
 269                 return EFI_OUT_OF_RESOURCES;
 270         }
 271
 272         if (image_setup_libfdt(&img, fdt, 0, NULL)) {
 273                 printf("ERROR: failed to process device tree\n");
 274                 return EFI_LOAD_ERROR;
 275         }
 276
 277         /* Install device tree as UEFI table */
 278         ret = efi_install_configuration_table(&efi_guid_fdt, fdt);
 279         if (ret != EFI_SUCCESS) {
 280                 printf("ERROR: failed to install device tree\n");
 281                 return ret;
 282         }
 283 #endif /* GENERATE_ACPI_TABLE */
 284
 285         return EFI_SUCCESS;
 286 }
 287
 288 /**
 289  * do_bootefi_exec() - execute EFI binary
 290  *
 291  * @handle:             handle of loaded image
 292  * Return:              status code
 293  *
 294  * Load the EFI binary into a newly assigned memory unwinding the relocation
 295  * information, install the loaded image protocol, and call the binary.
 296  */
 297 static efi_status_t do_bootefi_exec(efi_handle_t handle)
 298 {
 299         efi_status_t ret;
 300         efi_uintn_t exit_data_size = 0;
 301         u16 *exit_data = NULL;
 302
 303         /* Transfer environment variable as load options */
 304         ret = set_load_options(handle, "bootargs");
 305         if (ret != EFI_SUCCESS)
 306                 return ret;
 307
 308         /* Call our payload! */
 309         ret = EFI_CALL(efi_start_image(handle, &exit_data_size, &exit_data));
 310         printf("## Application terminated, r = %lu\n", ret & ~EFI_ERROR_MASK);
 311         if (ret && exit_data) {
 312                 printf("## %ls\n", exit_data);
 313                 efi_free_pool(exit_data);
 314         }
 315
 316         efi_restore_gd();
 317
 318         /*
 319          * FIXME: Who is responsible for
 320          *      free(loaded_image_info->load_options);
 321          * Once efi_exit() is implemented correctly,
 322          * handle itself doesn't exist here.
 323          */
 324
 325         return ret;
 326 }
 327
 328 /**
 329  * do_efibootmgr() - execute EFI Boot Manager
 330  *
 331  * @fdt_opt:    string of fdt start address
 332  * Return:      status code
 333  *
 334  * Execute EFI Boot Manager
 335  */
 336 static int do_efibootmgr(const char *fdt_opt)
 337 {
 338         efi_handle_t handle;
 339         efi_status_t ret;
 340
 341         /* Allow unaligned memory access */
 342         allow_unaligned();
 343
 344         switch_to_non_secure_mode();
 345
 346         /* Initialize EFI drivers */
 347         ret = efi_init_obj_list();
 348         if (ret != EFI_SUCCESS) {
 349                 printf("Error: Cannot initialize UEFI sub-system, r = %lu\n",
 350                        ret & ~EFI_ERROR_MASK);
 351                 return CMD_RET_FAILURE;
 352         }
 353
 354         ret = efi_install_fdt(fdt_opt);
 355         if (ret == EFI_INVALID_PARAMETER)
 356                 return CMD_RET_USAGE;
 357         else if (ret != EFI_SUCCESS)
 358                 return CMD_RET_FAILURE;
 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 from command line
 376  *
 377  * @image_opt:  string of image start address
 378  * @fdt_opt:    string of fdt start address
 379  * Return:      status code
 380  *
 381  * Set up memory image for the binary to be loaded, prepare
 382  * device path and then call do_bootefi_exec() to execute it.
 383  */
 384 static int do_bootefi_image(const char *image_opt, const char *fdt_opt)
 385 {
 386         void *image_buf;
 387         struct efi_device_path *device_path, *image_path;
 388         struct efi_device_path *file_path = NULL;
 389         unsigned long addr, size;
 390         const char *size_str;
 391         efi_handle_t mem_handle = NULL, handle;
 392         efi_status_t ret;
 393
 394         /* Allow unaligned memory access */
 395         allow_unaligned();
 396
 397         switch_to_non_secure_mode();
 398
 399         /* Initialize EFI drivers */
 400         ret = efi_init_obj_list();
 401         if (ret != EFI_SUCCESS) {
 402                 printf("Error: Cannot initialize UEFI sub-system, r = %lu\n",
 403                        ret & ~EFI_ERROR_MASK);
 404                 return CMD_RET_FAILURE;
 405         }
 406
 407         ret = efi_install_fdt(fdt_opt);
 408         if (ret == EFI_INVALID_PARAMETER)
 409                 return CMD_RET_USAGE;
 410         else if (ret != EFI_SUCCESS)
 411                 return CMD_RET_FAILURE;
 412
 413 #ifdef CONFIG_CMD_BOOTEFI_HELLO
 414         if (!strcmp(image_opt, "hello")) {
 415                 char *saddr;
 416
 417                 saddr = env_get("loadaddr");
 418                 size = __efi_helloworld_end - __efi_helloworld_begin;
 419
 420                 if (saddr)
 421                         addr = simple_strtoul(saddr, NULL, 16);
 422                 else
 423                         addr = CONFIG_SYS_LOAD_ADDR;
 424
 425                 image_buf = map_sysmem(addr, size);
 426                 memcpy(image_buf, __efi_helloworld_begin, size);
 427
 428                 device_path = NULL;
 429                 image_path = NULL;
 430         } else
 431 #endif
 432         {
 433                 size_str = env_get("filesize");
 434                 if (size_str)
 435                         size = simple_strtoul(size_str, NULL, 16);
 436                 else
 437                         size = 0;
 438
 439                 addr = simple_strtoul(image_opt, NULL, 16);
 440                 /* Check that a numeric value was passed */
 441                 if (!addr && *image_opt != '0')
 442                         return CMD_RET_USAGE;
 443
 444                 image_buf = map_sysmem(addr, size);
 445
 446                 device_path = bootefi_device_path;
 447                 image_path = bootefi_image_path;
 448         }
 449
 450         if (!device_path && !image_path) {
 451                 /*
 452                  * Special case for efi payload not loaded from disk,
 453                  * such as 'bootefi hello' or for example payload
 454                  * loaded directly into memory via JTAG, etc:
 455                  */
 456                 file_path = efi_dp_from_mem(EFI_RESERVED_MEMORY_TYPE,
 457                                             (uintptr_t)image_buf, size);
 458                 /*
 459                  * Make sure that device for device_path exist
 460                  * in load_image(). Otherwise, shell and grub will fail.
 461                  */
 462                 ret = efi_create_handle(&mem_handle);
 463                 if (ret != EFI_SUCCESS)
 464                         goto out;
 465
 466                 ret = efi_add_protocol(mem_handle, &efi_guid_device_path,
 467                                        file_path);
 468                 if (ret != EFI_SUCCESS)
 469                         goto out;
 470         } else {
 471                 assert(device_path && image_path);
 472                 file_path = efi_dp_append(device_path, image_path);
 473         }
 474
 475         ret = EFI_CALL(efi_load_image(false, efi_root,
 476                                       file_path, image_buf, size, &handle));
 477         if (ret != EFI_SUCCESS)
 478                 goto out;
 479
 480         ret = do_bootefi_exec(handle);
 481
 482 out:
 483         if (mem_handle)
 484                 efi_delete_handle(mem_handle);
 485         if (file_path)
 486                 efi_free_pool(file_path);
 487
 488         if (ret != EFI_SUCCESS)
 489                 return CMD_RET_FAILURE;
 490
 491         return CMD_RET_SUCCESS;
 492 }
 493
 494 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
 495 static efi_status_t bootefi_run_prepare(const char *load_options_path,
 496                 struct efi_device_path *device_path,
 497                 struct efi_device_path *image_path,
 498                 struct efi_loaded_image_obj **image_objp,
 499                 struct efi_loaded_image **loaded_image_infop)
 500 {
 501         efi_status_t ret;
 502
 503         ret = efi_setup_loaded_image(device_path, image_path, image_objp,
 504                                      loaded_image_infop);
 505         if (ret != EFI_SUCCESS)
 506                 return ret;
 507
 508         /* Transfer environment variable as load options */
 509         return set_load_options((efi_handle_t)*image_objp, load_options_path);
 510 }
 511
 512 /**
 513  * bootefi_test_prepare() - prepare to run an EFI test
 514  *
 515  * Prepare to run a test as if it were provided by a loaded image.
 516  *
 517  * @image_objp:         pointer to be set to the loaded image handle
 518  * @loaded_image_infop: pointer to be set to the loaded image protocol
 519  * @path:               dummy file path used to construct the device path
 520  *                      set in the loaded image protocol
 521  * @load_options_path:  name of a U-Boot environment variable. Its value is
 522  *                      set as load options in the loaded image protocol.
 523  * Return:              status code
 524  */
 525 static efi_status_t bootefi_test_prepare
 526                 (struct efi_loaded_image_obj **image_objp,
 527                  struct efi_loaded_image **loaded_image_infop, const char *path,
 528                  const char *load_options_path)
 529 {
 530         efi_status_t ret;
 531
 532         /* Construct a dummy device path */
 533         bootefi_device_path = efi_dp_from_mem(EFI_RESERVED_MEMORY_TYPE, 0, 0);
 534         if (!bootefi_device_path)
 535                 return EFI_OUT_OF_RESOURCES;
 536
 537         bootefi_image_path = efi_dp_from_file(NULL, 0, path);
 538         if (!bootefi_image_path) {
 539                 ret = EFI_OUT_OF_RESOURCES;
 540                 goto failure;
 541         }
 542
 543         ret = bootefi_run_prepare(load_options_path, bootefi_device_path,
 544                                   bootefi_image_path, image_objp,
 545                                   loaded_image_infop);
 546         if (ret == EFI_SUCCESS)
 547                 return ret;
 548
 549         efi_free_pool(bootefi_image_path);
 550         bootefi_image_path = NULL;
 551 failure:
 552         efi_free_pool(bootefi_device_path);
 553         bootefi_device_path = NULL;
 554         return ret;
 555 }
 556
 557 /**
 558  * bootefi_run_finish() - finish up after running an EFI test
 559  *
 560  * @loaded_image_info: Pointer to a struct which holds the loaded image info
 561  * @image_obj: Pointer to a struct which holds the loaded image object
 562  */
 563 static void bootefi_run_finish(struct efi_loaded_image_obj *image_obj,
 564                                struct efi_loaded_image *loaded_image_info)
 565 {
 566         efi_restore_gd();
 567         free(loaded_image_info->load_options);
 568         efi_delete_handle(&image_obj->header);
 569 }
 570
 571 /**
 572  * do_efi_selftest() - execute EFI Selftest
 573  *
 574  * @fdt_opt:    string of fdt start address
 575  * Return:      status code
 576  *
 577  * Execute EFI Selftest
 578  */
 579 static int do_efi_selftest(const char *fdt_opt)
 580 {
 581         struct efi_loaded_image_obj *image_obj;
 582         struct efi_loaded_image *loaded_image_info;
 583         efi_status_t ret;
 584
 585         /* Allow unaligned memory access */
 586         allow_unaligned();
 587
 588         switch_to_non_secure_mode();
 589
 590         /* Initialize EFI drivers */
 591         ret = efi_init_obj_list();
 592         if (ret != EFI_SUCCESS) {
 593                 printf("Error: Cannot initialize UEFI sub-system, r = %lu\n",
 594                        ret & ~EFI_ERROR_MASK);
 595                 return CMD_RET_FAILURE;
 596         }
 597
 598         ret = efi_install_fdt(fdt_opt);
 599         if (ret == EFI_INVALID_PARAMETER)
 600                 return CMD_RET_USAGE;
 601         else if (ret != EFI_SUCCESS)
 602                 return CMD_RET_FAILURE;
 603
 604         ret = bootefi_test_prepare(&image_obj, &loaded_image_info,
 605                                    "\\selftest", "efi_selftest");
 606         if (ret != EFI_SUCCESS)
 607                 return CMD_RET_FAILURE;
 608
 609         /* Execute the test */
 610         ret = EFI_CALL(efi_selftest(&image_obj->header, &systab));
 611         bootefi_run_finish(image_obj, loaded_image_info);
 612
 613         return ret != EFI_SUCCESS;
 614 }
 615 #endif /* CONFIG_CMD_BOOTEFI_SELFTEST */
 616
 617 /* Interpreter command to boot an arbitrary EFI image from memory */
 618 static int do_bootefi(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 619 {
 620         if (argc < 2)
 621                 return CMD_RET_USAGE;
 622
 623         if (!strcmp(argv[1], "bootmgr"))
 624                 return do_efibootmgr(argc > 2 ? argv[2] : NULL);
 625 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
 626         else if (!strcmp(argv[1], "selftest"))
 627                 return do_efi_selftest(argc > 2 ? argv[2] : NULL);
 628 #endif
 629
 630         return do_bootefi_image(argv[1], argc > 2 ? argv[2] : NULL);
 631 }
 632
 633 #ifdef CONFIG_SYS_LONGHELP
 634 static char bootefi_help_text[] =
 635         "<image address> [fdt address]\n"
 636         "  - boot EFI payload stored at address <image address>.\n"
 637         "    If specified, the device tree located at <fdt address> gets\n"
 638         "    exposed as EFI configuration table.\n"
 639 #ifdef CONFIG_CMD_BOOTEFI_HELLO
 640         "bootefi hello\n"
 641         "  - boot a sample Hello World application stored within U-Boot\n"
 642 #endif
 643 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
 644         "bootefi selftest [fdt address]\n"
 645         "  - boot an EFI selftest application stored within U-Boot\n"
 646         "    Use environment variable efi_selftest to select a single test.\n"
 647         "    Use 'setenv efi_selftest list' to enumerate all tests.\n"
 648 #endif
 649         "bootefi bootmgr [fdt address]\n"
 650         "  - load and boot EFI payload based on BootOrder/BootXXXX variables.\n"
 651         "\n"
 652         "    If specified, the device tree located at <fdt address> gets\n"
 653         "    exposed as EFI configuration table.\n";
 654 #endif
 655
 656 U_BOOT_CMD(
 657         bootefi, 3, 0, do_bootefi,
 658         "Boots an EFI payload from memory",
 659         bootefi_help_text
 660 );
 661
 662 void efi_set_bootdev(const char *dev, const char *devnr, const char *path)
 663 {
 664         struct efi_device_path *device, *image;
 665         efi_status_t ret;
 666
 667         /* efi_set_bootdev is typically called repeatedly, recover memory */
 668         efi_free_pool(bootefi_device_path);
 669         efi_free_pool(bootefi_image_path);
 670
 671         ret = efi_dp_from_name(dev, devnr, path, &device, &image);
 672         if (ret == EFI_SUCCESS) {
 673                 bootefi_device_path = device;
 674                 if (image) {
 675                         /* FIXME: image should not contain device */
 676                         struct efi_device_path *image_tmp = image;
 677
 678                         efi_dp_split_file_path(image, &device, &image);
 679                         efi_free_pool(image_tmp);
 680                 }
 681                 bootefi_image_path = image;
 682         } else {
 683                 bootefi_device_path = NULL;
 684                 bootefi_image_path = NULL;
 685         }
 686 }