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 relocated into a suitable location within the EFI memory map.
 152  * An additional 12KB is added to the space in case the device tree needs to be
 153  * expanded later with fdt_open_into().
 154  *
 155  * @fdt_addr:   On entry, address of start of FDT. On exit, address of relocated
 156  *              FDT start
 157  * Return:      status code
 158  */
 159 static efi_status_t copy_fdt(ulong *fdt_addrp)
 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 4KB of breathing room in case the device tree needs
 181          * to be expanded later. Round up to the nearest EFI page boundary.
 182          */
 183         fdt = map_sysmem(*fdt_addrp, 0);
 184         fdt_size = fdt_totalsize(fdt);
 185         fdt_size += 4096 * 3;
 186         fdt_size = ALIGN(fdt_size + EFI_PAGE_SIZE - 1, EFI_PAGE_SIZE);
 187         fdt_pages = fdt_size >> EFI_PAGE_SHIFT;
 188
 189         /* Safe fdt location is at 127MB */
 190         new_fdt_addr = fdt_ram_start + (127 * 1024 * 1024) + fdt_size;
 191         ret = efi_allocate_pages(EFI_ALLOCATE_MAX_ADDRESS,
 192                                  EFI_RUNTIME_SERVICES_DATA, fdt_pages,
 193                                  &new_fdt_addr);
 194         if (ret != EFI_SUCCESS) {
 195                 /* If we can't put it there, put it somewhere */
 196                 new_fdt_addr = (ulong)memalign(EFI_PAGE_SIZE, fdt_size);
 197                 ret = efi_allocate_pages(EFI_ALLOCATE_MAX_ADDRESS,
 198                                          EFI_RUNTIME_SERVICES_DATA, fdt_pages,
 199                                          &new_fdt_addr);
 200                 if (ret != EFI_SUCCESS) {
 201                         printf("ERROR: Failed to reserve space for FDT\n");
 202                         goto done;
 203                 }
 204         }
 205
 206         new_fdt = map_sysmem(new_fdt_addr, fdt_size);
 207         memcpy(new_fdt, fdt, fdt_totalsize(fdt));
 208         fdt_set_totalsize(new_fdt, fdt_size);
 209
 210         *fdt_addrp = new_fdt_addr;
 211 done:
 212         return ret;
 213 }
 214
 215 static efi_status_t efi_do_enter(
 216                         efi_handle_t image_handle, struct efi_system_table *st,
 217                         EFIAPI efi_status_t (*entry)(
 218                                 efi_handle_t image_handle,
 219                                 struct efi_system_table *st))
 220 {
 221         efi_status_t ret = EFI_LOAD_ERROR;
 222
 223         if (entry)
 224                 ret = entry(image_handle, st);
 225         st->boottime->exit(image_handle, ret, 0, NULL);
 226         return ret;
 227 }
 228
 229 #ifdef CONFIG_ARM64
 230 static efi_status_t efi_run_in_el2(EFIAPI efi_status_t (*entry)(
 231                         efi_handle_t image_handle, struct efi_system_table *st),
 232                         efi_handle_t image_handle, struct efi_system_table *st)
 233 {
 234         /* Enable caches again */
 235         dcache_enable();
 236
 237         return efi_do_enter(image_handle, st, entry);
 238 }
 239 #endif
 240
 241 #ifdef CONFIG_ARMV7_NONSEC
 242 static bool is_nonsec;
 243
 244 static efi_status_t efi_run_in_hyp(EFIAPI efi_status_t (*entry)(
 245                         efi_handle_t image_handle, struct efi_system_table *st),
 246                         efi_handle_t image_handle, struct efi_system_table *st)
 247 {
 248         /* Enable caches again */
 249         dcache_enable();
 250
 251         is_nonsec = true;
 252
 253         return efi_do_enter(image_handle, st, entry);
 254 }
 255 #endif
 256
 257 /*
 258  * efi_carve_out_dt_rsv() - Carve out DT reserved memory ranges
 259  *
 260  * The mem_rsv entries of the FDT are added to the memory map. Any failures are
 261  * ignored because this is not critical and we would rather continue to try to
 262  * boot.
 263  *
 264  * @fdt: Pointer to device tree
 265  */
 266 static void efi_carve_out_dt_rsv(void *fdt)
 267 {
 268         int nr_rsv, i;
 269         uint64_t addr, size, pages;
 270
 271         nr_rsv = fdt_num_mem_rsv(fdt);
 272
 273         /* Look for an existing entry and add it to the efi mem map. */
 274         for (i = 0; i < nr_rsv; i++) {
 275                 if (fdt_get_mem_rsv(fdt, i, &addr, &size) != 0)
 276                         continue;
 277
 278                 /*
 279                  * Do not carve out the device tree. It is already marked as
 280                  * EFI_RUNTIME_SERVICES_DATA
 281                  */
 282                 if (addr == (uintptr_t)fdt)
 283                         continue;
 284
 285                 pages = ALIGN(size + (addr & EFI_PAGE_MASK), EFI_PAGE_SIZE) >>
 286                         EFI_PAGE_SHIFT;
 287                 addr &= ~EFI_PAGE_MASK;
 288                 if (!efi_add_memory_map(addr, pages, EFI_RESERVED_MEMORY_TYPE,
 289                                         false))
 290                         printf("FDT memrsv map %d: Failed to add to map\n", i);
 291         }
 292 }
 293
 294 static efi_status_t efi_install_fdt(ulong fdt_addr)
 295 {
 296         bootm_headers_t img = { 0 };
 297         efi_status_t ret;
 298         void *fdt;
 299
 300         fdt = map_sysmem(fdt_addr, 0);
 301         if (fdt_check_header(fdt)) {
 302                 printf("ERROR: invalid device tree\n");
 303                 return EFI_INVALID_PARAMETER;
 304         }
 305
 306         /* Prepare fdt for payload */
 307         ret = copy_fdt(&fdt_addr);
 308         if (ret)
 309                 return ret;
 310
 311         unmap_sysmem(fdt);
 312         fdt = map_sysmem(fdt_addr, 0);
 313         if (image_setup_libfdt(&img, fdt, 0, NULL)) {
 314                 printf("ERROR: failed to process device tree\n");
 315                 return EFI_LOAD_ERROR;
 316         }
 317
 318         efi_carve_out_dt_rsv(fdt);
 319
 320         /* Link to it in the efi tables */
 321         ret = efi_install_configuration_table(&efi_guid_fdt, fdt);
 322         if (ret != EFI_SUCCESS)
 323                 return EFI_OUT_OF_RESOURCES;
 324
 325         return ret;
 326 }
 327
 328 static efi_status_t bootefi_run_prepare(const char *load_options_path,
 329                 struct efi_device_path *device_path,
 330                 struct efi_device_path *image_path,
 331                 struct efi_loaded_image_obj **image_objp,
 332                 struct efi_loaded_image **loaded_image_infop)
 333 {
 334         efi_status_t ret;
 335
 336         ret = efi_setup_loaded_image(device_path, image_path, image_objp,
 337                                      loaded_image_infop);
 338         if (ret != EFI_SUCCESS)
 339                 return ret;
 340
 341         /* Transfer environment variable as load options */
 342         set_load_options(*loaded_image_infop, load_options_path);
 343
 344         return 0;
 345 }
 346
 347 /**
 348  * bootefi_run_finish() - finish up after running an EFI test
 349  *
 350  * @loaded_image_info: Pointer to a struct which holds the loaded image info
 351  * @image_objj: Pointer to a struct which holds the loaded image object
 352  */
 353 static void bootefi_run_finish(struct efi_loaded_image_obj *image_obj,
 354                                struct efi_loaded_image *loaded_image_info)
 355 {
 356         efi_restore_gd();
 357         free(loaded_image_info->load_options);
 358         efi_delete_handle(&image_obj->header);
 359 }
 360
 361 /**
 362  * do_bootefi_exec() - execute EFI binary
 363  *
 364  * @efi:                address of the binary
 365  * @device_path:        path of the device from which the binary was loaded
 366  * @image_path:         device path of the binary
 367  * Return:              status code
 368  *
 369  * Load the EFI binary into a newly assigned memory unwinding the relocation
 370  * information, install the loaded image protocol, and call the binary.
 371  */
 372 static efi_status_t do_bootefi_exec(void *efi,
 373                                     struct efi_device_path *device_path,
 374                                     struct efi_device_path *image_path)
 375 {
 376         efi_handle_t mem_handle = NULL;
 377         struct efi_device_path *memdp = NULL;
 378         efi_status_t ret;
 379         struct efi_loaded_image_obj *image_obj = NULL;
 380         struct efi_loaded_image *loaded_image_info = NULL;
 381
 382         EFIAPI efi_status_t (*entry)(efi_handle_t image_handle,
 383                                      struct efi_system_table *st);
 384
 385         /*
 386          * Special case for efi payload not loaded from disk, such as
 387          * 'bootefi hello' or for example payload loaded directly into
 388          * memory via JTAG, etc:
 389          */
 390         if (!device_path && !image_path) {
 391                 printf("WARNING: using memory device/image path, this may confuse some payloads!\n");
 392                 /* actual addresses filled in after efi_load_pe() */
 393                 memdp = efi_dp_from_mem(0, 0, 0);
 394                 device_path = image_path = memdp;
 395                 /*
 396                  * Grub expects that the device path of the loaded image is
 397                  * installed on a handle.
 398                  */
 399                 ret = efi_create_handle(&mem_handle);
 400                 if (ret != EFI_SUCCESS)
 401                         return ret; /* TODO: leaks device_path */
 402                 ret = efi_add_protocol(mem_handle, &efi_guid_device_path,
 403                                        device_path);
 404                 if (ret != EFI_SUCCESS)
 405                         goto err_add_protocol;
 406         } else {
 407                 assert(device_path && image_path);
 408         }
 409
 410         ret = bootefi_run_prepare("bootargs", device_path, image_path,
 411                                   &image_obj, &loaded_image_info);
 412         if (ret)
 413                 goto err_prepare;
 414
 415         /* Load the EFI payload */
 416         entry = efi_load_pe(image_obj, efi, loaded_image_info);
 417         if (!entry) {
 418                 ret = EFI_LOAD_ERROR;
 419                 goto err_prepare;
 420         }
 421
 422         if (memdp) {
 423                 struct efi_device_path_memory *mdp = (void *)memdp;
 424                 mdp->memory_type = loaded_image_info->image_code_type;
 425                 mdp->start_address = (uintptr_t)loaded_image_info->image_base;
 426                 mdp->end_address = mdp->start_address +
 427                                 loaded_image_info->image_size;
 428         }
 429
 430         /* we don't support much: */
 431         env_set("efi_8be4df61-93ca-11d2-aa0d-00e098032b8c_OsIndicationsSupported",
 432                 "{ro,boot}(blob)0000000000000000");
 433
 434         /* Call our payload! */
 435         debug("%s:%d Jumping to 0x%lx\n", __func__, __LINE__, (long)entry);
 436
 437         if (setjmp(&image_obj->exit_jmp)) {
 438                 ret = image_obj->exit_status;
 439                 goto err_prepare;
 440         }
 441
 442 #ifdef CONFIG_ARM64
 443         /* On AArch64 we need to make sure we call our payload in < EL3 */
 444         if (current_el() == 3) {
 445                 smp_kick_all_cpus();
 446                 dcache_disable();       /* flush cache before switch to EL2 */
 447
 448                 /* Move into EL2 and keep running there */
 449                 armv8_switch_to_el2((ulong)entry,
 450                                     (ulong)&image_obj->header,
 451                                     (ulong)&systab, 0, (ulong)efi_run_in_el2,
 452                                     ES_TO_AARCH64);
 453
 454                 /* Should never reach here, efi exits with longjmp */
 455                 while (1) { }
 456         }
 457 #endif
 458
 459 #ifdef CONFIG_ARMV7_NONSEC
 460         if (armv7_boot_nonsec() && !is_nonsec) {
 461                 dcache_disable();       /* flush cache before switch to HYP */
 462
 463                 armv7_init_nonsec();
 464                 secure_ram_addr(_do_nonsec_entry)(
 465                                         efi_run_in_hyp,
 466                                         (uintptr_t)entry,
 467                                         (uintptr_t)&image_obj->header,
 468                                         (uintptr_t)&systab);
 469
 470                 /* Should never reach here, efi exits with longjmp */
 471                 while (1) { }
 472         }
 473 #endif
 474
 475         ret = efi_do_enter(&image_obj->header, &systab, entry);
 476
 477 err_prepare:
 478         /* image has returned, loaded-image obj goes *poof*: */
 479         bootefi_run_finish(image_obj, loaded_image_info);
 480
 481 err_add_protocol:
 482         if (mem_handle)
 483                 efi_delete_handle(mem_handle);
 484
 485         return ret;
 486 }
 487
 488 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
 489 /**
 490  * bootefi_test_prepare() - prepare to run an EFI test
 491  *
 492  * This sets things up so we can call EFI functions. This involves preparing
 493  * the 'gd' pointer and setting up the load ed image data structures.
 494  *
 495  * @image_objp: loaded_image_infop: Pointer to a struct which will hold the
 496  *    loaded image object. This struct will be inited by this function before
 497  *    use.
 498  * @loaded_image_infop: Pointer to a struct which will hold the loaded image
 499  *    info. This struct will be inited by this function before use.
 500  * @path: File path to the test being run (often just the test name with a
 501  *    backslash before it
 502  * @test_func: Address of the test function that is being run
 503  * @load_options_path: U-Boot environment variable to use as load options
 504  * @return 0 if OK, -ve on error
 505  */
 506 static efi_status_t bootefi_test_prepare
 507                 (struct efi_loaded_image_obj **image_objp,
 508                 struct efi_loaded_image **loaded_image_infop, const char *path,
 509                 ulong test_func, const char *load_options_path)
 510 {
 511         /* Construct a dummy device path */
 512         bootefi_device_path = efi_dp_from_mem(EFI_RESERVED_MEMORY_TYPE,
 513                                               (uintptr_t)test_func,
 514                                               (uintptr_t)test_func);
 515         if (!bootefi_device_path)
 516                 return EFI_OUT_OF_RESOURCES;
 517         bootefi_image_path = efi_dp_from_file(NULL, 0, path);
 518         if (!bootefi_image_path)
 519                 return EFI_OUT_OF_RESOURCES;
 520
 521         return bootefi_run_prepare(load_options_path, bootefi_device_path,
 522                                    bootefi_image_path, image_objp,
 523                                    loaded_image_infop);
 524 }
 525
 526 #endif /* CONFIG_CMD_BOOTEFI_SELFTEST */
 527
 528 static int do_bootefi_bootmgr_exec(void)
 529 {
 530         struct efi_device_path *device_path, *file_path;
 531         void *addr;
 532         efi_status_t r;
 533
 534         addr = efi_bootmgr_load(&device_path, &file_path);
 535         if (!addr)
 536                 return 1;
 537
 538         printf("## Starting EFI application at %p ...\n", addr);
 539         r = do_bootefi_exec(addr, device_path, file_path);
 540         printf("## Application terminated, r = %lu\n",
 541                r & ~EFI_ERROR_MASK);
 542
 543         if (r != EFI_SUCCESS)
 544                 return 1;
 545
 546         return 0;
 547 }
 548
 549 /* Interpreter command to boot an arbitrary EFI image from memory */
 550 static int do_bootefi(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 551 {
 552         unsigned long addr;
 553         char *saddr;
 554         efi_status_t r;
 555         unsigned long fdt_addr;
 556
 557         /* Allow unaligned memory access */
 558         allow_unaligned();
 559
 560         /* Initialize EFI drivers */
 561         r = efi_init_obj_list();
 562         if (r != EFI_SUCCESS) {
 563                 printf("Error: Cannot set up EFI drivers, r = %lu\n",
 564                        r & ~EFI_ERROR_MASK);
 565                 return CMD_RET_FAILURE;
 566         }
 567
 568         if (argc < 2)
 569                 return CMD_RET_USAGE;
 570
 571         if (argc > 2) {
 572                 fdt_addr = simple_strtoul(argv[2], NULL, 16);
 573                 if (!fdt_addr && *argv[2] != '0')
 574                         return CMD_RET_USAGE;
 575                 /* Install device tree */
 576                 r = efi_install_fdt(fdt_addr);
 577                 if (r != EFI_SUCCESS) {
 578                         printf("ERROR: failed to install device tree\n");
 579                         return CMD_RET_FAILURE;
 580                 }
 581         } else {
 582                 /* Remove device tree. EFI_NOT_FOUND can be ignored here */
 583                 efi_install_configuration_table(&efi_guid_fdt, NULL);
 584                 printf("WARNING: booting without device tree\n");
 585         }
 586 #ifdef CONFIG_CMD_BOOTEFI_HELLO
 587         if (!strcmp(argv[1], "hello")) {
 588                 ulong size = __efi_helloworld_end - __efi_helloworld_begin;
 589
 590                 saddr = env_get("loadaddr");
 591                 if (saddr)
 592                         addr = simple_strtoul(saddr, NULL, 16);
 593                 else
 594                         addr = CONFIG_SYS_LOAD_ADDR;
 595                 memcpy(map_sysmem(addr, size), __efi_helloworld_begin, size);
 596         } else
 597 #endif
 598 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
 599         if (!strcmp(argv[1], "selftest")) {
 600                 struct efi_loaded_image_obj *image_obj;
 601                 struct efi_loaded_image *loaded_image_info;
 602
 603                 if (bootefi_test_prepare(&image_obj, &loaded_image_info,
 604                                          "\\selftest", (uintptr_t)&efi_selftest,
 605                                          "efi_selftest"))
 606                         return CMD_RET_FAILURE;
 607
 608                 /* Execute the test */
 609                 r = efi_selftest(&image_obj->header, &systab);
 610                 bootefi_run_finish(image_obj, loaded_image_info);
 611                 return r != EFI_SUCCESS;
 612         } else
 613 #endif
 614         if (!strcmp(argv[1], "bootmgr")) {
 615                 return do_bootefi_bootmgr_exec();
 616         } else {
 617                 saddr = argv[1];
 618
 619                 addr = simple_strtoul(saddr, NULL, 16);
 620                 /* Check that a numeric value was passed */
 621                 if (!addr && *saddr != '0')
 622                         return CMD_RET_USAGE;
 623
 624         }
 625
 626         printf("## Starting EFI application at %08lx ...\n", addr);
 627         r = do_bootefi_exec(map_sysmem(addr, 0), bootefi_device_path,
 628                             bootefi_image_path);
 629         printf("## Application terminated, r = %lu\n",
 630                r & ~EFI_ERROR_MASK);
 631
 632         if (r != EFI_SUCCESS)
 633                 return 1;
 634         else
 635                 return 0;
 636 }
 637
 638 #ifdef CONFIG_SYS_LONGHELP
 639 static char bootefi_help_text[] =
 640         "<image address> [fdt address]\n"
 641         "  - boot EFI payload stored at address <image address>.\n"
 642         "    If specified, the device tree located at <fdt address> gets\n"
 643         "    exposed as EFI configuration table.\n"
 644 #ifdef CONFIG_CMD_BOOTEFI_HELLO
 645         "bootefi hello\n"
 646         "  - boot a sample Hello World application stored within U-Boot\n"
 647 #endif
 648 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
 649         "bootefi selftest [fdt address]\n"
 650         "  - boot an EFI selftest application stored within U-Boot\n"
 651         "    Use environment variable efi_selftest to select a single test.\n"
 652         "    Use 'setenv efi_selftest list' to enumerate all tests.\n"
 653 #endif
 654         "bootefi bootmgr [fdt addr]\n"
 655         "  - load and boot EFI payload based on BootOrder/BootXXXX variables.\n"
 656         "\n"
 657         "    If specified, the device tree located at <fdt address> gets\n"
 658         "    exposed as EFI configuration table.\n";
 659 #endif
 660
 661 U_BOOT_CMD(
 662         bootefi, 3, 0, do_bootefi,
 663         "Boots an EFI payload from memory",
 664         bootefi_help_text
 665 );
 666
 667 void efi_set_bootdev(const char *dev, const char *devnr, const char *path)
 668 {
 669         struct efi_device_path *device, *image;
 670         efi_status_t ret;
 671
 672         /* efi_set_bootdev is typically called repeatedly, recover memory */
 673         efi_free_pool(bootefi_device_path);
 674         efi_free_pool(bootefi_image_path);
 675
 676         ret = efi_dp_from_name(dev, devnr, path, &device, &image);
 677         if (ret == EFI_SUCCESS) {
 678                 bootefi_device_path = device;
 679                 bootefi_image_path = image;
 680         } else {
 681                 bootefi_device_path = NULL;
 682                 bootefi_image_path = NULL;
 683         }
 684 }