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