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 <charset.h>
   9 #include <common.h>
  10 #include <command.h>
  11 #include <dm.h>
  12 #include <efi_loader.h>
  13 #include <efi_selftest.h>
  14 #include <errno.h>
  15 #include <linux/libfdt.h>
  16 #include <linux/libfdt_env.h>
  17 #include <mapmem.h>
  18 #include <memalign.h>
  19 #include <asm/global_data.h>
  20 #include <asm-generic/sections.h>
  21 #include <asm-generic/unaligned.h>
  22 #include <linux/linkage.h>
  23
  24 #ifdef CONFIG_ARMV7_NONSEC
  25 #include <asm/armv7.h>
  26 #include <asm/secure.h>
  27 #endif
  28
  29 DECLARE_GLOBAL_DATA_PTR;
  30
  31 #define OBJ_LIST_NOT_INITIALIZED 1
  32
  33 static efi_status_t efi_obj_list_initialized = OBJ_LIST_NOT_INITIALIZED;
  34
  35 static struct efi_device_path *bootefi_image_path;
  36 static struct efi_device_path *bootefi_device_path;
  37
  38 /* Initialize and populate EFI object list */
  39 efi_status_t efi_init_obj_list(void)
  40 {
  41         efi_status_t ret = EFI_SUCCESS;
  42
  43         /*
  44          * On the ARM architecture gd is mapped to a fixed register (r9 or x18).
  45          * As this register may be overwritten by an EFI payload we save it here
  46          * and restore it on every callback entered.
  47          */
  48         efi_save_gd();
  49
  50         /* Initialize once only */
  51         if (efi_obj_list_initialized != OBJ_LIST_NOT_INITIALIZED)
  52                 return efi_obj_list_initialized;
  53
  54         /* Initialize system table */
  55         ret = efi_initialize_system_table();
  56         if (ret != EFI_SUCCESS)
  57                 goto out;
  58
  59         /* Initialize root node */
  60         ret = efi_root_node_register();
  61         if (ret != EFI_SUCCESS)
  62                 goto out;
  63
  64         /* Initialize EFI driver uclass */
  65         ret = efi_driver_init();
  66         if (ret != EFI_SUCCESS)
  67                 goto out;
  68
  69         ret = efi_console_register();
  70         if (ret != EFI_SUCCESS)
  71                 goto out;
  72 #ifdef CONFIG_PARTITIONS
  73         ret = efi_disk_register();
  74         if (ret != EFI_SUCCESS)
  75                 goto out;
  76 #endif
  77 #if defined(CONFIG_LCD) || defined(CONFIG_DM_VIDEO)
  78         ret = efi_gop_register();
  79         if (ret != EFI_SUCCESS)
  80                 goto out;
  81 #endif
  82 #ifdef CONFIG_NET
  83         ret = efi_net_register();
  84         if (ret != EFI_SUCCESS)
  85                 goto out;
  86 #endif
  87 #ifdef CONFIG_GENERATE_ACPI_TABLE
  88         ret = efi_acpi_register();
  89         if (ret != EFI_SUCCESS)
  90                 goto out;
  91 #endif
  92 #ifdef CONFIG_GENERATE_SMBIOS_TABLE
  93         ret = efi_smbios_register();
  94         if (ret != EFI_SUCCESS)
  95                 goto out;
  96 #endif
  97         ret = efi_watchdog_register();
  98         if (ret != EFI_SUCCESS)
  99                 goto out;
 100
 101         /* Initialize EFI runtime services */
 102         ret = efi_reset_system_init();
 103         if (ret != EFI_SUCCESS)
 104                 goto out;
 105
 106 out:
 107         efi_obj_list_initialized = ret;
 108         return ret;
 109 }
 110
 111 /*
 112  * Allow unaligned memory access.
 113  *
 114  * This routine is overridden by architectures providing this feature.
 115  */
 116 void __weak allow_unaligned(void)
 117 {
 118 }
 119
 120 /*
 121  * Set the load options of an image from an environment variable.
 122  *
 123  * @loaded_image_info:  the image
 124  * @env_var:            name of the environment variable
 125  */
 126 static void set_load_options(struct efi_loaded_image *loaded_image_info,
 127                              const char *env_var)
 128 {
 129         size_t size;
 130         const char *env = env_get(env_var);
 131         u16 *pos;
 132
 133         loaded_image_info->load_options = NULL;
 134         loaded_image_info->load_options_size = 0;
 135         if (!env)
 136                 return;
 137         size = utf8_utf16_strlen(env) + 1;
 138         loaded_image_info->load_options = calloc(size, sizeof(u16));
 139         if (!loaded_image_info->load_options) {
 140                 printf("ERROR: Out of memory\n");
 141                 return;
 142         }
 143         pos = loaded_image_info->load_options;
 144         utf8_utf16_strcpy(&pos, env);
 145         loaded_image_info->load_options_size = size * 2;
 146 }
 147
 148 /**
 149  * copy_fdt() - Copy the device tree to a new location available to EFI
 150  *
 151  * The FDT is copied to a suitable location within the EFI memory map.
 152  * Additional 12 KiB are added to the space in case the device tree needs to be
 153  * expanded later with fdt_open_into().
 154  *
 155  * @fdtp:       On entry a pointer to the flattened device tree.
 156  *              On exit a pointer to the copy of the flattened device tree.
 157  *              FDT start
 158  * Return:      status code
 159  */
 160 static efi_status_t copy_fdt(void **fdtp)
 161 {
 162         unsigned long fdt_ram_start = -1L, fdt_pages;
 163         efi_status_t ret = 0;
 164         void *fdt, *new_fdt;
 165         u64 new_fdt_addr;
 166         uint fdt_size;
 167         int i;
 168
 169         for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
 170                 u64 ram_start = gd->bd->bi_dram[i].start;
 171                 u64 ram_size = gd->bd->bi_dram[i].size;
 172
 173                 if (!ram_size)
 174                         continue;
 175
 176                 if (ram_start < fdt_ram_start)
 177                         fdt_ram_start = ram_start;
 178         }
 179
 180         /*
 181          * Give us at least 12 KiB of breathing room in case the device tree
 182          * needs to be expanded later.
 183          */
 184         fdt = *fdtp;
 185         fdt_pages = efi_size_in_pages(fdt_totalsize(fdt) + 0x3000);
 186         fdt_size = fdt_pages << EFI_PAGE_SHIFT;
 187
 188         /*
 189          * Safe fdt location is at 127 MiB.
 190          * On the sandbox convert from the sandbox address space.
 191          */
 192         new_fdt_addr = (uintptr_t)map_sysmem(fdt_ram_start + 0x7f00000 +
 193                                              fdt_size, 0);
 194         ret = efi_allocate_pages(EFI_ALLOCATE_MAX_ADDRESS,
 195                                  EFI_RUNTIME_SERVICES_DATA, fdt_pages,
 196                                  &new_fdt_addr);
 197         if (ret != EFI_SUCCESS) {
 198                 /* If we can't put it there, put it somewhere */
 199                 new_fdt_addr = (ulong)memalign(EFI_PAGE_SIZE, fdt_size);
 200                 ret = efi_allocate_pages(EFI_ALLOCATE_MAX_ADDRESS,
 201                                          EFI_RUNTIME_SERVICES_DATA, fdt_pages,
 202                                          &new_fdt_addr);
 203                 if (ret != EFI_SUCCESS) {
 204                         printf("ERROR: Failed to reserve space for FDT\n");
 205                         goto done;
 206                 }
 207         }
 208         new_fdt = (void *)(uintptr_t)new_fdt_addr;
 209         memcpy(new_fdt, fdt, fdt_totalsize(fdt));
 210         fdt_set_totalsize(new_fdt, fdt_size);
 211
 212         *fdtp = (void *)(uintptr_t)new_fdt_addr;
 213 done:
 214         return ret;
 215 }
 216
 217 static efi_status_t efi_do_enter(
 218                         efi_handle_t image_handle, struct efi_system_table *st,
 219                         EFIAPI efi_status_t (*entry)(
 220                                 efi_handle_t image_handle,
 221                                 struct efi_system_table *st))
 222 {
 223         efi_status_t ret = EFI_LOAD_ERROR;
 224
 225         if (entry)
 226                 ret = entry(image_handle, st);
 227         st->boottime->exit(image_handle, ret, 0, NULL);
 228         return ret;
 229 }
 230
 231 #ifdef CONFIG_ARM64
 232 static efi_status_t efi_run_in_el2(EFIAPI efi_status_t (*entry)(
 233                         efi_handle_t image_handle, struct efi_system_table *st),
 234                         efi_handle_t image_handle, struct efi_system_table *st)
 235 {
 236         /* Enable caches again */
 237         dcache_enable();
 238
 239         return efi_do_enter(image_handle, st, entry);
 240 }
 241 #endif
 242
 243 #ifdef CONFIG_ARMV7_NONSEC
 244 static bool is_nonsec;
 245
 246 static efi_status_t efi_run_in_hyp(EFIAPI efi_status_t (*entry)(
 247                         efi_handle_t image_handle, struct efi_system_table *st),
 248                         efi_handle_t image_handle, struct efi_system_table *st)
 249 {
 250         /* Enable caches again */
 251         dcache_enable();
 252
 253         is_nonsec = true;
 254
 255         return efi_do_enter(image_handle, st, entry);
 256 }
 257 #endif
 258
 259 /*
 260  * efi_carve_out_dt_rsv() - Carve out DT reserved memory ranges
 261  *
 262  * The mem_rsv entries of the FDT are added to the memory map. Any failures are
 263  * ignored because this is not critical and we would rather continue to try to
 264  * boot.
 265  *
 266  * @fdt: Pointer to device tree
 267  */
 268 static void efi_carve_out_dt_rsv(void *fdt)
 269 {
 270         int nr_rsv, i;
 271         uint64_t addr, size, pages;
 272
 273         nr_rsv = fdt_num_mem_rsv(fdt);
 274
 275         /* Look for an existing entry and add it to the efi mem map. */
 276         for (i = 0; i < nr_rsv; i++) {
 277                 if (fdt_get_mem_rsv(fdt, i, &addr, &size) != 0)
 278                         continue;
 279
 280                 /* Convert from sandbox address space. */
 281                 addr = (uintptr_t)map_sysmem(addr, 0);
 282
 283                 /*
 284                  * Do not carve out the device tree. It is already marked as
 285                  * EFI_RUNTIME_SERVICES_DATA
 286                  */
 287                 if (addr == (uintptr_t)fdt)
 288                         continue;
 289
 290                 pages = efi_size_in_pages(size + (addr & EFI_PAGE_MASK));
 291                 addr &= ~EFI_PAGE_MASK;
 292                 if (!efi_add_memory_map(addr, pages, EFI_RESERVED_MEMORY_TYPE,
 293                                         false))
 294                         printf("FDT memrsv map %d: Failed to add to map\n", i);
 295         }
 296 }
 297
 298 static efi_status_t efi_install_fdt(ulong fdt_addr)
 299 {
 300         bootm_headers_t img = { 0 };
 301         efi_status_t ret;
 302         void *fdt;
 303
 304         fdt = map_sysmem(fdt_addr, 0);
 305         if (fdt_check_header(fdt)) {
 306                 printf("ERROR: invalid device tree\n");
 307                 return EFI_INVALID_PARAMETER;
 308         }
 309
 310         /* Prepare fdt for payload */
 311         ret = copy_fdt(&fdt);
 312         if (ret)
 313                 return ret;
 314
 315         if (image_setup_libfdt(&img, fdt, 0, NULL)) {
 316                 printf("ERROR: failed to process device tree\n");
 317                 return EFI_LOAD_ERROR;
 318         }
 319
 320         efi_carve_out_dt_rsv(fdt);
 321
 322         /* Link to it in the efi tables */
 323         ret = efi_install_configuration_table(&efi_guid_fdt, fdt);
 324         if (ret != EFI_SUCCESS)
 325                 return EFI_OUT_OF_RESOURCES;
 326
 327         return ret;
 328 }
 329
 330 static efi_status_t bootefi_run_prepare(const char *load_options_path,
 331                 struct efi_device_path *device_path,
 332                 struct efi_device_path *image_path,
 333                 struct efi_loaded_image_obj **image_objp,
 334                 struct efi_loaded_image **loaded_image_infop)
 335 {
 336         efi_status_t ret;
 337
 338         ret = efi_setup_loaded_image(device_path, image_path, image_objp,
 339                                      loaded_image_infop);
 340         if (ret != EFI_SUCCESS)
 341                 return ret;
 342
 343         /* Transfer environment variable as load options */
 344         set_load_options(*loaded_image_infop, load_options_path);
 345
 346         return 0;
 347 }
 348
 349 /**
 350  * bootefi_run_finish() - finish up after running an EFI test
 351  *
 352  * @loaded_image_info: Pointer to a struct which holds the loaded image info
 353  * @image_objj: Pointer to a struct which holds the loaded image object
 354  */
 355 static void bootefi_run_finish(struct efi_loaded_image_obj *image_obj,
 356                                struct efi_loaded_image *loaded_image_info)
 357 {
 358         efi_restore_gd();
 359         free(loaded_image_info->load_options);
 360         efi_delete_handle(&image_obj->header);
 361 }
 362
 363 /**
 364  * do_bootefi_exec() - execute EFI binary
 365  *
 366  * @efi:                address of the binary
 367  * @device_path:        path of the device from which the binary was loaded
 368  * @image_path:         device path of the binary
 369  * Return:              status code
 370  *
 371  * Load the EFI binary into a newly assigned memory unwinding the relocation
 372  * information, install the loaded image protocol, and call the binary.
 373  */
 374 static efi_status_t do_bootefi_exec(void *efi,
 375                                     struct efi_device_path *device_path,
 376                                     struct efi_device_path *image_path)
 377 {
 378         efi_handle_t mem_handle = NULL;
 379         struct efi_device_path *memdp = NULL;
 380         efi_status_t ret;
 381         struct efi_loaded_image_obj *image_obj = NULL;
 382         struct efi_loaded_image *loaded_image_info = NULL;
 383
 384         EFIAPI efi_status_t (*entry)(efi_handle_t image_handle,
 385                                      struct efi_system_table *st);
 386
 387         /*
 388          * Special case for efi payload not loaded from disk, such as
 389          * 'bootefi hello' or for example payload loaded directly into
 390          * memory via JTAG, etc:
 391          */
 392         if (!device_path && !image_path) {
 393                 printf("WARNING: using memory device/image path, this may confuse some payloads!\n");
 394                 /* actual addresses filled in after efi_load_pe() */
 395                 memdp = efi_dp_from_mem(0, 0, 0);
 396                 device_path = image_path = memdp;
 397                 /*
 398                  * Grub expects that the device path of the loaded image is
 399                  * installed on a handle.
 400                  */
 401                 ret = efi_create_handle(&mem_handle);
 402                 if (ret != EFI_SUCCESS)
 403                         return ret; /* TODO: leaks device_path */
 404                 ret = efi_add_protocol(mem_handle, &efi_guid_device_path,
 405                                        device_path);
 406                 if (ret != EFI_SUCCESS)
 407                         goto err_add_protocol;
 408         } else {
 409                 assert(device_path && image_path);
 410         }
 411
 412         ret = bootefi_run_prepare("bootargs", device_path, image_path,
 413                                   &image_obj, &loaded_image_info);
 414         if (ret)
 415                 goto err_prepare;
 416
 417         /* Load the EFI payload */
 418         entry = efi_load_pe(image_obj, efi, loaded_image_info);
 419         if (!entry) {
 420                 ret = EFI_LOAD_ERROR;
 421                 goto err_prepare;
 422         }
 423
 424         if (memdp) {
 425                 struct efi_device_path_memory *mdp = (void *)memdp;
 426                 mdp->memory_type = loaded_image_info->image_code_type;
 427                 mdp->start_address = (uintptr_t)loaded_image_info->image_base;
 428                 mdp->end_address = mdp->start_address +
 429                                 loaded_image_info->image_size;
 430         }
 431
 432         /* we don't support much: */
 433         env_set("efi_8be4df61-93ca-11d2-aa0d-00e098032b8c_OsIndicationsSupported",
 434                 "{ro,boot}(blob)0000000000000000");
 435
 436         /* Call our payload! */
 437         debug("%s:%d Jumping to 0x%lx\n", __func__, __LINE__, (long)entry);
 438
 439         if (setjmp(&image_obj->exit_jmp)) {
 440                 ret = image_obj->exit_status;
 441                 goto err_prepare;
 442         }
 443
 444 #ifdef CONFIG_ARM64
 445         /* On AArch64 we need to make sure we call our payload in < EL3 */
 446         if (current_el() == 3) {
 447                 smp_kick_all_cpus();
 448                 dcache_disable();       /* flush cache before switch to EL2 */
 449
 450                 /* Move into EL2 and keep running there */
 451                 armv8_switch_to_el2((ulong)entry,
 452                                     (ulong)&image_obj->header,
 453                                     (ulong)&systab, 0, (ulong)efi_run_in_el2,
 454                                     ES_TO_AARCH64);
 455
 456                 /* Should never reach here, efi exits with longjmp */
 457                 while (1) { }
 458         }
 459 #endif
 460
 461 #ifdef CONFIG_ARMV7_NONSEC
 462         if (armv7_boot_nonsec() && !is_nonsec) {
 463                 dcache_disable();       /* flush cache before switch to HYP */
 464
 465                 armv7_init_nonsec();
 466                 secure_ram_addr(_do_nonsec_entry)(
 467                                         efi_run_in_hyp,
 468                                         (uintptr_t)entry,
 469                                         (uintptr_t)&image_obj->header,
 470                                         (uintptr_t)&systab);
 471
 472                 /* Should never reach here, efi exits with longjmp */
 473                 while (1) { }
 474         }
 475 #endif
 476
 477         ret = efi_do_enter(&image_obj->header, &systab, entry);
 478
 479 err_prepare:
 480         /* image has returned, loaded-image obj goes *poof*: */
 481         bootefi_run_finish(image_obj, loaded_image_info);
 482
 483 err_add_protocol:
 484         if (mem_handle)
 485                 efi_delete_handle(mem_handle);
 486
 487         return ret;
 488 }
 489
 490 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
 491 /**
 492  * bootefi_test_prepare() - prepare to run an EFI test
 493  *
 494  * This sets things up so we can call EFI functions. This involves preparing
 495  * the 'gd' pointer and setting up the load ed image data structures.
 496  *
 497  * @image_objp: loaded_image_infop: Pointer to a struct which will hold the
 498  *    loaded image object. This struct will be inited by this function before
 499  *    use.
 500  * @loaded_image_infop: Pointer to a struct which will hold the loaded image
 501  *    info. This struct will be inited by this function before use.
 502  * @path: File path to the test being run (often just the test name with a
 503  *    backslash before it
 504  * @test_func: Address of the test function that is being run
 505  * @load_options_path: U-Boot environment variable to use as load options
 506  * @return 0 if OK, -ve on error
 507  */
 508 static efi_status_t bootefi_test_prepare
 509                 (struct efi_loaded_image_obj **image_objp,
 510                 struct efi_loaded_image **loaded_image_infop, const char *path,
 511                 ulong test_func, const char *load_options_path)
 512 {
 513         /* Construct a dummy device path */
 514         bootefi_device_path = efi_dp_from_mem(EFI_RESERVED_MEMORY_TYPE,
 515                                               (uintptr_t)test_func,
 516                                               (uintptr_t)test_func);
 517         if (!bootefi_device_path)
 518                 return EFI_OUT_OF_RESOURCES;
 519         bootefi_image_path = efi_dp_from_file(NULL, 0, path);
 520         if (!bootefi_image_path)
 521                 return EFI_OUT_OF_RESOURCES;
 522
 523         return bootefi_run_prepare(load_options_path, bootefi_device_path,
 524                                    bootefi_image_path, image_objp,
 525                                    loaded_image_infop);
 526 }
 527
 528 #endif /* CONFIG_CMD_BOOTEFI_SELFTEST */
 529
 530 static int do_bootefi_bootmgr_exec(void)
 531 {
 532         struct efi_device_path *device_path, *file_path;
 533         void *addr;
 534         efi_status_t r;
 535
 536         addr = efi_bootmgr_load(&device_path, &file_path);
 537         if (!addr)
 538                 return 1;
 539
 540         printf("## Starting EFI application at %p ...\n", addr);
 541         r = do_bootefi_exec(addr, device_path, file_path);
 542         printf("## Application terminated, r = %lu\n",
 543                r & ~EFI_ERROR_MASK);
 544
 545         if (r != EFI_SUCCESS)
 546                 return 1;
 547
 548         return 0;
 549 }
 550
 551 /* Interpreter command to boot an arbitrary EFI image from memory */
 552 static int do_bootefi(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 553 {
 554         unsigned long addr;
 555         char *saddr;
 556         efi_status_t r;
 557         unsigned long fdt_addr;
 558
 559         /* Allow unaligned memory access */
 560         allow_unaligned();
 561
 562         /* Initialize EFI drivers */
 563         r = efi_init_obj_list();
 564         if (r != EFI_SUCCESS) {
 565                 printf("Error: Cannot set up EFI drivers, r = %lu\n",
 566                        r & ~EFI_ERROR_MASK);
 567                 return CMD_RET_FAILURE;
 568         }
 569
 570         if (argc < 2)
 571                 return CMD_RET_USAGE;
 572
 573         if (argc > 2) {
 574                 fdt_addr = simple_strtoul(argv[2], NULL, 16);
 575                 if (!fdt_addr && *argv[2] != '0')
 576                         return CMD_RET_USAGE;
 577                 /* Install device tree */
 578                 r = efi_install_fdt(fdt_addr);
 579                 if (r != EFI_SUCCESS) {
 580                         printf("ERROR: failed to install device tree\n");
 581                         return CMD_RET_FAILURE;
 582                 }
 583         } else {
 584                 /* Remove device tree. EFI_NOT_FOUND can be ignored here */
 585                 efi_install_configuration_table(&efi_guid_fdt, NULL);
 586                 printf("WARNING: booting without device tree\n");
 587         }
 588 #ifdef CONFIG_CMD_BOOTEFI_HELLO
 589         if (!strcmp(argv[1], "hello")) {
 590                 ulong size = __efi_helloworld_end - __efi_helloworld_begin;
 591
 592                 saddr = env_get("loadaddr");
 593                 if (saddr)
 594                         addr = simple_strtoul(saddr, NULL, 16);
 595                 else
 596                         addr = CONFIG_SYS_LOAD_ADDR;
 597                 memcpy(map_sysmem(addr, size), __efi_helloworld_begin, size);
 598         } else
 599 #endif
 600 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
 601         if (!strcmp(argv[1], "selftest")) {
 602                 struct efi_loaded_image_obj *image_obj;
 603                 struct efi_loaded_image *loaded_image_info;
 604
 605                 if (bootefi_test_prepare(&image_obj, &loaded_image_info,
 606                                          "\\selftest", (uintptr_t)&efi_selftest,
 607                                          "efi_selftest"))
 608                         return CMD_RET_FAILURE;
 609
 610                 /* Execute the test */
 611                 r = efi_selftest(&image_obj->header, &systab);
 612                 bootefi_run_finish(image_obj, loaded_image_info);
 613                 return r != EFI_SUCCESS;
 614         } else
 615 #endif
 616         if (!strcmp(argv[1], "bootmgr")) {
 617                 return do_bootefi_bootmgr_exec();
 618         } else {
 619                 saddr = argv[1];
 620
 621                 addr = simple_strtoul(saddr, NULL, 16);
 622                 /* Check that a numeric value was passed */
 623                 if (!addr && *saddr != '0')
 624                         return CMD_RET_USAGE;
 625
 626         }
 627
 628         printf("## Starting EFI application at %08lx ...\n", addr);
 629         r = do_bootefi_exec(map_sysmem(addr, 0), bootefi_device_path,
 630                             bootefi_image_path);
 631         printf("## Application terminated, r = %lu\n",
 632                r & ~EFI_ERROR_MASK);
 633
 634         if (r != EFI_SUCCESS)
 635                 return 1;
 636         else
 637                 return 0;
 638 }
 639
 640 #ifdef CONFIG_SYS_LONGHELP
 641 static char bootefi_help_text[] =
 642         "<image address> [fdt address]\n"
 643         "  - boot EFI payload stored at address <image address>.\n"
 644         "    If specified, the device tree located at <fdt address> gets\n"
 645         "    exposed as EFI configuration table.\n"
 646 #ifdef CONFIG_CMD_BOOTEFI_HELLO
 647         "bootefi hello\n"
 648         "  - boot a sample Hello World application stored within U-Boot\n"
 649 #endif
 650 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
 651         "bootefi selftest [fdt address]\n"
 652         "  - boot an EFI selftest application stored within U-Boot\n"
 653         "    Use environment variable efi_selftest to select a single test.\n"
 654         "    Use 'setenv efi_selftest list' to enumerate all tests.\n"
 655 #endif
 656         "bootefi bootmgr [fdt addr]\n"
 657         "  - load and boot EFI payload based on BootOrder/BootXXXX variables.\n"
 658         "\n"
 659         "    If specified, the device tree located at <fdt address> gets\n"
 660         "    exposed as EFI configuration table.\n";
 661 #endif
 662
 663 U_BOOT_CMD(
 664         bootefi, 3, 0, do_bootefi,
 665         "Boots an EFI payload from memory",
 666         bootefi_help_text
 667 );
 668
 669 void efi_set_bootdev(const char *dev, const char *devnr, const char *path)
 670 {
 671         struct efi_device_path *device, *image;
 672         efi_status_t ret;
 673
 674         /* efi_set_bootdev is typically called repeatedly, recover memory */
 675         efi_free_pool(bootefi_device_path);
 676         efi_free_pool(bootefi_image_path);
 677
 678         ret = efi_dp_from_name(dev, devnr, path, &device, &image);
 679         if (ret == EFI_SUCCESS) {
 680                 bootefi_device_path = device;
 681                 bootefi_image_path = image;
 682         } else {
 683                 bootefi_device_path = NULL;
 684                 bootefi_image_path = NULL;
 685         }
 686 }