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  * 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  * @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 12 KiB of breathing room in case the device tree
 181          * needs to be expanded later.
 182          */
 183         fdt = map_sysmem(*fdt_addrp, 0);
 184         fdt_pages = efi_size_in_pages(fdt_totalsize(fdt) + 0x3000);
 185         fdt_size = fdt_pages << EFI_PAGE_SHIFT;
 186
 187         /* Safe fdt location is at 127MB */
 188         new_fdt_addr = fdt_ram_start + (127 * 1024 * 1024) + fdt_size;
 189         ret = efi_allocate_pages(EFI_ALLOCATE_MAX_ADDRESS,
 190                                  EFI_RUNTIME_SERVICES_DATA, fdt_pages,
 191                                  &new_fdt_addr);
 192         if (ret != EFI_SUCCESS) {
 193                 /* If we can't put it there, put it somewhere */
 194                 new_fdt_addr = (ulong)memalign(EFI_PAGE_SIZE, fdt_size);
 195                 ret = efi_allocate_pages(EFI_ALLOCATE_MAX_ADDRESS,
 196                                          EFI_RUNTIME_SERVICES_DATA, fdt_pages,
 197                                          &new_fdt_addr);
 198                 if (ret != EFI_SUCCESS) {
 199                         printf("ERROR: Failed to reserve space for FDT\n");
 200                         goto done;
 201                 }
 202         }
 203
 204         new_fdt = map_sysmem(new_fdt_addr, fdt_size);
 205         memcpy(new_fdt, fdt, fdt_totalsize(fdt));
 206         fdt_set_totalsize(new_fdt, fdt_size);
 207
 208         *fdt_addrp = new_fdt_addr;
 209 done:
 210         return ret;
 211 }
 212
 213 static efi_status_t efi_do_enter(
 214                         efi_handle_t image_handle, struct efi_system_table *st,
 215                         EFIAPI efi_status_t (*entry)(
 216                                 efi_handle_t image_handle,
 217                                 struct efi_system_table *st))
 218 {
 219         efi_status_t ret = EFI_LOAD_ERROR;
 220
 221         if (entry)
 222                 ret = entry(image_handle, st);
 223         st->boottime->exit(image_handle, ret, 0, NULL);
 224         return ret;
 225 }
 226
 227 #ifdef CONFIG_ARM64
 228 static efi_status_t efi_run_in_el2(EFIAPI efi_status_t (*entry)(
 229                         efi_handle_t image_handle, struct efi_system_table *st),
 230                         efi_handle_t image_handle, struct efi_system_table *st)
 231 {
 232         /* Enable caches again */
 233         dcache_enable();
 234
 235         return efi_do_enter(image_handle, st, entry);
 236 }
 237 #endif
 238
 239 #ifdef CONFIG_ARMV7_NONSEC
 240 static bool is_nonsec;
 241
 242 static efi_status_t efi_run_in_hyp(EFIAPI efi_status_t (*entry)(
 243                         efi_handle_t image_handle, struct efi_system_table *st),
 244                         efi_handle_t image_handle, struct efi_system_table *st)
 245 {
 246         /* Enable caches again */
 247         dcache_enable();
 248
 249         is_nonsec = true;
 250
 251         return efi_do_enter(image_handle, st, entry);
 252 }
 253 #endif
 254
 255 /*
 256  * efi_carve_out_dt_rsv() - Carve out DT reserved memory ranges
 257  *
 258  * The mem_rsv entries of the FDT are added to the memory map. Any failures are
 259  * ignored because this is not critical and we would rather continue to try to
 260  * boot.
 261  *
 262  * @fdt: Pointer to device tree
 263  */
 264 static void efi_carve_out_dt_rsv(void *fdt)
 265 {
 266         int nr_rsv, i;
 267         uint64_t addr, size, pages;
 268
 269         nr_rsv = fdt_num_mem_rsv(fdt);
 270
 271         /* Look for an existing entry and add it to the efi mem map. */
 272         for (i = 0; i < nr_rsv; i++) {
 273                 if (fdt_get_mem_rsv(fdt, i, &addr, &size) != 0)
 274                         continue;
 275
 276                 /*
 277                  * Do not carve out the device tree. It is already marked as
 278                  * EFI_RUNTIME_SERVICES_DATA
 279                  */
 280                 if (addr == (uintptr_t)fdt)
 281                         continue;
 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         /* Prepare fdt for payload */
 304         ret = copy_fdt(&fdt_addr);
 305         if (ret)
 306                 return ret;
 307
 308         unmap_sysmem(fdt);
 309         fdt = map_sysmem(fdt_addr, 0);
 310         if (image_setup_libfdt(&img, fdt, 0, NULL)) {
 311                 printf("ERROR: failed to process device tree\n");
 312                 return EFI_LOAD_ERROR;
 313         }
 314
 315         efi_carve_out_dt_rsv(fdt);
 316
 317         /* Link to it in the efi tables */
 318         ret = efi_install_configuration_table(&efi_guid_fdt, fdt);
 319         if (ret != EFI_SUCCESS)
 320                 return EFI_OUT_OF_RESOURCES;
 321
 322         return ret;
 323 }
 324
 325 static efi_status_t bootefi_run_prepare(const char *load_options_path,
 326                 struct efi_device_path *device_path,
 327                 struct efi_device_path *image_path,
 328                 struct efi_loaded_image_obj **image_objp,
 329                 struct efi_loaded_image **loaded_image_infop)
 330 {
 331         efi_status_t ret;
 332
 333         ret = efi_setup_loaded_image(device_path, image_path, image_objp,
 334                                      loaded_image_infop);
 335         if (ret != EFI_SUCCESS)
 336                 return ret;
 337
 338         /* Transfer environment variable as load options */
 339         set_load_options(*loaded_image_infop, load_options_path);
 340
 341         return 0;
 342 }
 343
 344 /**
 345  * bootefi_run_finish() - finish up after running an EFI test
 346  *
 347  * @loaded_image_info: Pointer to a struct which holds the loaded image info
 348  * @image_objj: Pointer to a struct which holds the loaded image object
 349  */
 350 static void bootefi_run_finish(struct efi_loaded_image_obj *image_obj,
 351                                struct efi_loaded_image *loaded_image_info)
 352 {
 353         efi_restore_gd();
 354         free(loaded_image_info->load_options);
 355         efi_delete_handle(&image_obj->header);
 356 }
 357
 358 /**
 359  * do_bootefi_exec() - execute EFI binary
 360  *
 361  * @efi:                address of the binary
 362  * @device_path:        path of the device from which the binary was loaded
 363  * @image_path:         device path of the binary
 364  * Return:              status code
 365  *
 366  * Load the EFI binary into a newly assigned memory unwinding the relocation
 367  * information, install the loaded image protocol, and call the binary.
 368  */
 369 static efi_status_t do_bootefi_exec(void *efi,
 370                                     struct efi_device_path *device_path,
 371                                     struct efi_device_path *image_path)
 372 {
 373         efi_handle_t mem_handle = NULL;
 374         struct efi_device_path *memdp = NULL;
 375         efi_status_t ret;
 376         struct efi_loaded_image_obj *image_obj = NULL;
 377         struct efi_loaded_image *loaded_image_info = NULL;
 378
 379         EFIAPI efi_status_t (*entry)(efi_handle_t image_handle,
 380                                      struct efi_system_table *st);
 381
 382         /*
 383          * Special case for efi payload not loaded from disk, such as
 384          * 'bootefi hello' or for example payload loaded directly into
 385          * memory via JTAG, etc:
 386          */
 387         if (!device_path && !image_path) {
 388                 printf("WARNING: using memory device/image path, this may confuse some payloads!\n");
 389                 /* actual addresses filled in after efi_load_pe() */
 390                 memdp = efi_dp_from_mem(0, 0, 0);
 391                 device_path = image_path = memdp;
 392                 /*
 393                  * Grub expects that the device path of the loaded image is
 394                  * installed on a handle.
 395                  */
 396                 ret = efi_create_handle(&mem_handle);
 397                 if (ret != EFI_SUCCESS)
 398                         return ret; /* TODO: leaks device_path */
 399                 ret = efi_add_protocol(mem_handle, &efi_guid_device_path,
 400                                        device_path);
 401                 if (ret != EFI_SUCCESS)
 402                         goto err_add_protocol;
 403         } else {
 404                 assert(device_path && image_path);
 405         }
 406
 407         ret = bootefi_run_prepare("bootargs", device_path, image_path,
 408                                   &image_obj, &loaded_image_info);
 409         if (ret)
 410                 goto err_prepare;
 411
 412         /* Load the EFI payload */
 413         entry = efi_load_pe(image_obj, efi, loaded_image_info);
 414         if (!entry) {
 415                 ret = EFI_LOAD_ERROR;
 416                 goto err_prepare;
 417         }
 418
 419         if (memdp) {
 420                 struct efi_device_path_memory *mdp = (void *)memdp;
 421                 mdp->memory_type = loaded_image_info->image_code_type;
 422                 mdp->start_address = (uintptr_t)loaded_image_info->image_base;
 423                 mdp->end_address = mdp->start_address +
 424                                 loaded_image_info->image_size;
 425         }
 426
 427         /* we don't support much: */
 428         env_set("efi_8be4df61-93ca-11d2-aa0d-00e098032b8c_OsIndicationsSupported",
 429                 "{ro,boot}(blob)0000000000000000");
 430
 431         /* Call our payload! */
 432         debug("%s:%d Jumping to 0x%lx\n", __func__, __LINE__, (long)entry);
 433
 434         if (setjmp(&image_obj->exit_jmp)) {
 435                 ret = image_obj->exit_status;
 436                 goto err_prepare;
 437         }
 438
 439 #ifdef CONFIG_ARM64
 440         /* On AArch64 we need to make sure we call our payload in < EL3 */
 441         if (current_el() == 3) {
 442                 smp_kick_all_cpus();
 443                 dcache_disable();       /* flush cache before switch to EL2 */
 444
 445                 /* Move into EL2 and keep running there */
 446                 armv8_switch_to_el2((ulong)entry,
 447                                     (ulong)&image_obj->header,
 448                                     (ulong)&systab, 0, (ulong)efi_run_in_el2,
 449                                     ES_TO_AARCH64);
 450
 451                 /* Should never reach here, efi exits with longjmp */
 452                 while (1) { }
 453         }
 454 #endif
 455
 456 #ifdef CONFIG_ARMV7_NONSEC
 457         if (armv7_boot_nonsec() && !is_nonsec) {
 458                 dcache_disable();       /* flush cache before switch to HYP */
 459
 460                 armv7_init_nonsec();
 461                 secure_ram_addr(_do_nonsec_entry)(
 462                                         efi_run_in_hyp,
 463                                         (uintptr_t)entry,
 464                                         (uintptr_t)&image_obj->header,
 465                                         (uintptr_t)&systab);
 466
 467                 /* Should never reach here, efi exits with longjmp */
 468                 while (1) { }
 469         }
 470 #endif
 471
 472         ret = efi_do_enter(&image_obj->header, &systab, entry);
 473
 474 err_prepare:
 475         /* image has returned, loaded-image obj goes *poof*: */
 476         bootefi_run_finish(image_obj, loaded_image_info);
 477
 478 err_add_protocol:
 479         if (mem_handle)
 480                 efi_delete_handle(mem_handle);
 481
 482         return ret;
 483 }
 484
 485 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
 486 /**
 487  * bootefi_test_prepare() - prepare to run an EFI test
 488  *
 489  * This sets things up so we can call EFI functions. This involves preparing
 490  * the 'gd' pointer and setting up the load ed image data structures.
 491  *
 492  * @image_objp: loaded_image_infop: Pointer to a struct which will hold the
 493  *    loaded image object. This struct will be inited by this function before
 494  *    use.
 495  * @loaded_image_infop: Pointer to a struct which will hold the loaded image
 496  *    info. This struct will be inited by this function before use.
 497  * @path: File path to the test being run (often just the test name with a
 498  *    backslash before it
 499  * @test_func: Address of the test function that is being run
 500  * @load_options_path: U-Boot environment variable to use as load options
 501  * @return 0 if OK, -ve on error
 502  */
 503 static efi_status_t bootefi_test_prepare
 504                 (struct efi_loaded_image_obj **image_objp,
 505                 struct efi_loaded_image **loaded_image_infop, const char *path,
 506                 ulong test_func, const char *load_options_path)
 507 {
 508         /* Construct a dummy device path */
 509         bootefi_device_path = efi_dp_from_mem(EFI_RESERVED_MEMORY_TYPE,
 510                                               (uintptr_t)test_func,
 511                                               (uintptr_t)test_func);
 512         if (!bootefi_device_path)
 513                 return EFI_OUT_OF_RESOURCES;
 514         bootefi_image_path = efi_dp_from_file(NULL, 0, path);
 515         if (!bootefi_image_path)
 516                 return EFI_OUT_OF_RESOURCES;
 517
 518         return bootefi_run_prepare(load_options_path, bootefi_device_path,
 519                                    bootefi_image_path, image_objp,
 520                                    loaded_image_infop);
 521 }
 522
 523 #endif /* CONFIG_CMD_BOOTEFI_SELFTEST */
 524
 525 static int do_bootefi_bootmgr_exec(void)
 526 {
 527         struct efi_device_path *device_path, *file_path;
 528         void *addr;
 529         efi_status_t r;
 530
 531         addr = efi_bootmgr_load(&device_path, &file_path);
 532         if (!addr)
 533                 return 1;
 534
 535         printf("## Starting EFI application at %p ...\n", addr);
 536         r = do_bootefi_exec(addr, device_path, file_path);
 537         printf("## Application terminated, r = %lu\n",
 538                r & ~EFI_ERROR_MASK);
 539
 540         if (r != EFI_SUCCESS)
 541                 return 1;
 542
 543         return 0;
 544 }
 545
 546 /* Interpreter command to boot an arbitrary EFI image from memory */
 547 static int do_bootefi(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 548 {
 549         unsigned long addr;
 550         char *saddr;
 551         efi_status_t r;
 552         unsigned long fdt_addr;
 553
 554         /* Allow unaligned memory access */
 555         allow_unaligned();
 556
 557         /* Initialize EFI drivers */
 558         r = efi_init_obj_list();
 559         if (r != EFI_SUCCESS) {
 560                 printf("Error: Cannot set up EFI drivers, r = %lu\n",
 561                        r & ~EFI_ERROR_MASK);
 562                 return CMD_RET_FAILURE;
 563         }
 564
 565         if (argc < 2)
 566                 return CMD_RET_USAGE;
 567
 568         if (argc > 2) {
 569                 fdt_addr = simple_strtoul(argv[2], NULL, 16);
 570                 if (!fdt_addr && *argv[2] != '0')
 571                         return CMD_RET_USAGE;
 572                 /* Install device tree */
 573                 r = efi_install_fdt(fdt_addr);
 574                 if (r != EFI_SUCCESS) {
 575                         printf("ERROR: failed to install device tree\n");
 576                         return CMD_RET_FAILURE;
 577                 }
 578         } else {
 579                 /* Remove device tree. EFI_NOT_FOUND can be ignored here */
 580                 efi_install_configuration_table(&efi_guid_fdt, NULL);
 581                 printf("WARNING: booting without device tree\n");
 582         }
 583 #ifdef CONFIG_CMD_BOOTEFI_HELLO
 584         if (!strcmp(argv[1], "hello")) {
 585                 ulong size = __efi_helloworld_end - __efi_helloworld_begin;
 586
 587                 saddr = env_get("loadaddr");
 588                 if (saddr)
 589                         addr = simple_strtoul(saddr, NULL, 16);
 590                 else
 591                         addr = CONFIG_SYS_LOAD_ADDR;
 592                 memcpy(map_sysmem(addr, size), __efi_helloworld_begin, size);
 593         } else
 594 #endif
 595 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
 596         if (!strcmp(argv[1], "selftest")) {
 597                 struct efi_loaded_image_obj *image_obj;
 598                 struct efi_loaded_image *loaded_image_info;
 599
 600                 if (bootefi_test_prepare(&image_obj, &loaded_image_info,
 601                                          "\\selftest", (uintptr_t)&efi_selftest,
 602                                          "efi_selftest"))
 603                         return CMD_RET_FAILURE;
 604
 605                 /* Execute the test */
 606                 r = efi_selftest(&image_obj->header, &systab);
 607                 bootefi_run_finish(image_obj, loaded_image_info);
 608                 return r != EFI_SUCCESS;
 609         } else
 610 #endif
 611         if (!strcmp(argv[1], "bootmgr")) {
 612                 return do_bootefi_bootmgr_exec();
 613         } else {
 614                 saddr = argv[1];
 615
 616                 addr = simple_strtoul(saddr, NULL, 16);
 617                 /* Check that a numeric value was passed */
 618                 if (!addr && *saddr != '0')
 619                         return CMD_RET_USAGE;
 620
 621         }
 622
 623         printf("## Starting EFI application at %08lx ...\n", addr);
 624         r = do_bootefi_exec(map_sysmem(addr, 0), bootefi_device_path,
 625                             bootefi_image_path);
 626         printf("## Application terminated, r = %lu\n",
 627                r & ~EFI_ERROR_MASK);
 628
 629         if (r != EFI_SUCCESS)
 630                 return 1;
 631         else
 632                 return 0;
 633 }
 634
 635 #ifdef CONFIG_SYS_LONGHELP
 636 static char bootefi_help_text[] =
 637         "<image address> [fdt address]\n"
 638         "  - boot EFI payload stored at address <image address>.\n"
 639         "    If specified, the device tree located at <fdt address> gets\n"
 640         "    exposed as EFI configuration table.\n"
 641 #ifdef CONFIG_CMD_BOOTEFI_HELLO
 642         "bootefi hello\n"
 643         "  - boot a sample Hello World application stored within U-Boot\n"
 644 #endif
 645 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
 646         "bootefi selftest [fdt address]\n"
 647         "  - boot an EFI selftest application stored within U-Boot\n"
 648         "    Use environment variable efi_selftest to select a single test.\n"
 649         "    Use 'setenv efi_selftest list' to enumerate all tests.\n"
 650 #endif
 651         "bootefi bootmgr [fdt addr]\n"
 652         "  - load and boot EFI payload based on BootOrder/BootXXXX variables.\n"
 653         "\n"
 654         "    If specified, the device tree located at <fdt address> gets\n"
 655         "    exposed as EFI configuration table.\n";
 656 #endif
 657
 658 U_BOOT_CMD(
 659         bootefi, 3, 0, do_bootefi,
 660         "Boots an EFI payload from memory",
 661         bootefi_help_text
 662 );
 663
 664 void efi_set_bootdev(const char *dev, const char *devnr, const char *path)
 665 {
 666         struct efi_device_path *device, *image;
 667         efi_status_t ret;
 668
 669         /* efi_set_bootdev is typically called repeatedly, recover memory */
 670         efi_free_pool(bootefi_device_path);
 671         efi_free_pool(bootefi_image_path);
 672
 673         ret = efi_dp_from_name(dev, devnr, path, &device, &image);
 674         if (ret == EFI_SUCCESS) {
 675                 bootefi_device_path = device;
 676                 bootefi_image_path = image;
 677         } else {
 678                 bootefi_device_path = NULL;
 679                 bootefi_image_path = NULL;
 680         }
 681 }