cmd/bootefi.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  *  EFI application loader
   4  *
   5  *  Copyright (c) 2016 Alexander Graf
   6  */
   7
   8 #include <common.h>
   9 #include <charset.h>
  10 #include <command.h>
  11 #include <dm.h>
  12 #include <efi_loader.h>
  13 #include <efi_selftest.h>
  14 #include <env.h>
  15 #include <errno.h>
  16 #include <image.h>
  17 #include <malloc.h>
  18 #include <linux/libfdt.h>
  19 #include <linux/libfdt_env.h>
  20 #include <mapmem.h>
  21 #include <memalign.h>
  22 #include <asm-generic/sections.h>
  23 #include <linux/linkage.h>
  24
  25 DECLARE_GLOBAL_DATA_PTR;
  26
  27 static struct efi_device_path *bootefi_image_path;
  28 static struct efi_device_path *bootefi_device_path;
  29
  30 /**
  31  * Set the load options of an image from an environment variable.
  32  *
  33  * @handle:             the image handle
  34  * @env_var:            name of the environment variable
  35  * @load_options:       pointer to load options (output)
  36  * Return:              status code
  37  */
  38 static efi_status_t set_load_options(efi_handle_t handle, const char *env_var,
  39                                      u16 **load_options)
  40 {
  41         struct efi_loaded_image *loaded_image_info;
  42         size_t size;
  43         const char *env = env_get(env_var);
  44         u16 *pos;
  45         efi_status_t ret;
  46
  47         *load_options = NULL;
  48         ret = EFI_CALL(systab.boottime->open_protocol(
  49                                         handle,
  50                                         &efi_guid_loaded_image,
  51                                         (void **)&loaded_image_info,
  52                                         efi_root, NULL,
  53                                         EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL));
  54         if (ret != EFI_SUCCESS)
  55                 return EFI_INVALID_PARAMETER;
  56
  57         loaded_image_info->load_options = NULL;
  58         loaded_image_info->load_options_size = 0;
  59         if (!env)
  60                 goto out;
  61
  62         size = utf8_utf16_strlen(env) + 1;
  63         loaded_image_info->load_options = calloc(size, sizeof(u16));
  64         if (!loaded_image_info->load_options) {
  65                 printf("ERROR: Out of memory\n");
  66                 EFI_CALL(systab.boottime->close_protocol(handle,
  67                                                          &efi_guid_loaded_image,
  68                                                          efi_root, NULL));
  69                 return EFI_OUT_OF_RESOURCES;
  70         }
  71         pos = loaded_image_info->load_options;
  72         *load_options = pos;
  73         utf8_utf16_strcpy(&pos, env);
  74         loaded_image_info->load_options_size = size * 2;
  75
  76 out:
  77         return EFI_CALL(systab.boottime->close_protocol(handle,
  78                                                         &efi_guid_loaded_image,
  79                                                         efi_root, NULL));
  80 }
  81
  82 #if !CONFIG_IS_ENABLED(GENERATE_ACPI_TABLE)
  83
  84 /**
  85  * copy_fdt() - Copy the device tree to a new location available to EFI
  86  *
  87  * The FDT is copied to a suitable location within the EFI memory map.
  88  * Additional 12 KiB are added to the space in case the device tree needs to be
  89  * expanded later with fdt_open_into().
  90  *
  91  * @fdtp:       On entry a pointer to the flattened device tree.
  92  *              On exit a pointer to the copy of the flattened device tree.
  93  *              FDT start
  94  * Return:      status code
  95  */
  96 static efi_status_t copy_fdt(void **fdtp)
  97 {
  98         unsigned long fdt_ram_start = -1L, fdt_pages;
  99         efi_status_t ret = 0;
 100         void *fdt, *new_fdt;
 101         u64 new_fdt_addr;
 102         uint fdt_size;
 103         int i;
 104
 105         for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
 106                 u64 ram_start = gd->bd->bi_dram[i].start;
 107                 u64 ram_size = gd->bd->bi_dram[i].size;
 108
 109                 if (!ram_size)
 110                         continue;
 111
 112                 if (ram_start < fdt_ram_start)
 113                         fdt_ram_start = ram_start;
 114         }
 115
 116         /*
 117          * Give us at least 12 KiB of breathing room in case the device tree
 118          * needs to be expanded later.
 119          */
 120         fdt = *fdtp;
 121         fdt_pages = efi_size_in_pages(fdt_totalsize(fdt) + 0x3000);
 122         fdt_size = fdt_pages << EFI_PAGE_SHIFT;
 123
 124         /*
 125          * Safe fdt location is at 127 MiB.
 126          * On the sandbox convert from the sandbox address space.
 127          */
 128         new_fdt_addr = (uintptr_t)map_sysmem(fdt_ram_start + 0x7f00000 +
 129                                              fdt_size, 0);
 130         ret = efi_allocate_pages(EFI_ALLOCATE_MAX_ADDRESS,
 131                                  EFI_ACPI_RECLAIM_MEMORY, fdt_pages,
 132                                  &new_fdt_addr);
 133         if (ret != EFI_SUCCESS) {
 134                 /* If we can't put it there, put it somewhere */
 135                 new_fdt_addr = (ulong)memalign(EFI_PAGE_SIZE, fdt_size);
 136                 ret = efi_allocate_pages(EFI_ALLOCATE_MAX_ADDRESS,
 137                                          EFI_ACPI_RECLAIM_MEMORY, fdt_pages,
 138                                          &new_fdt_addr);
 139                 if (ret != EFI_SUCCESS) {
 140                         printf("ERROR: Failed to reserve space for FDT\n");
 141                         goto done;
 142                 }
 143         }
 144         new_fdt = (void *)(uintptr_t)new_fdt_addr;
 145         memcpy(new_fdt, fdt, fdt_totalsize(fdt));
 146         fdt_set_totalsize(new_fdt, fdt_size);
 147
 148         *fdtp = (void *)(uintptr_t)new_fdt_addr;
 149 done:
 150         return ret;
 151 }
 152
 153 static void efi_reserve_memory(u64 addr, u64 size)
 154 {
 155         /* Convert from sandbox address space. */
 156         addr = (uintptr_t)map_sysmem(addr, 0);
 157         if (efi_add_memory_map(addr, size,
 158                                EFI_RESERVED_MEMORY_TYPE) != EFI_SUCCESS)
 159                 printf("Reserved memory mapping failed addr %llx size %llx\n",
 160                        addr, size);
 161 }
 162
 163 /**
 164  * efi_carve_out_dt_rsv() - Carve out DT reserved memory ranges
 165  *
 166  * The mem_rsv entries of the FDT are added to the memory map. Any failures are
 167  * ignored because this is not critical and we would rather continue to try to
 168  * boot.
 169  *
 170  * @fdt: Pointer to device tree
 171  */
 172 static void efi_carve_out_dt_rsv(void *fdt)
 173 {
 174         int nr_rsv, i;
 175         u64 addr, size;
 176         int nodeoffset, subnode;
 177
 178         nr_rsv = fdt_num_mem_rsv(fdt);
 179
 180         /* Look for an existing entry and add it to the efi mem map. */
 181         for (i = 0; i < nr_rsv; i++) {
 182                 if (fdt_get_mem_rsv(fdt, i, &addr, &size) != 0)
 183                         continue;
 184                 efi_reserve_memory(addr, size);
 185         }
 186
 187         /* process reserved-memory */
 188         nodeoffset = fdt_subnode_offset(fdt, 0, "reserved-memory");
 189         if (nodeoffset >= 0) {
 190                 subnode = fdt_first_subnode(fdt, nodeoffset);
 191                 while (subnode >= 0) {
 192                         fdt_addr_t fdt_addr, fdt_size;
 193
 194                         /* check if this subnode has a reg property */
 195                         fdt_addr = fdtdec_get_addr_size_auto_parent(
 196                                                 fdt, nodeoffset, subnode,
 197                                                 "reg", 0, &fdt_size, false);
 198                         /*
 199                          * The /reserved-memory node may have children with
 200                          * a size instead of a reg property.
 201                          */
 202                         if (addr != FDT_ADDR_T_NONE &&
 203                             fdtdec_get_is_enabled(fdt, subnode))
 204                                 efi_reserve_memory(fdt_addr, fdt_size);
 205                         subnode = fdt_next_subnode(fdt, subnode);
 206                 }
 207         }
 208 }
 209
 210 /**
 211  * get_config_table() - get configuration table
 212  *
 213  * @guid:       GUID of the configuration table
 214  * Return:      pointer to configuration table or NULL
 215  */
 216 static void *get_config_table(const efi_guid_t *guid)
 217 {
 218         size_t i;
 219
 220         for (i = 0; i < systab.nr_tables; i++) {
 221                 if (!guidcmp(guid, &systab.tables[i].guid))
 222                         return systab.tables[i].table;
 223         }
 224         return NULL;
 225 }
 226
 227 #endif /* !CONFIG_IS_ENABLED(GENERATE_ACPI_TABLE) */
 228
 229 /**
 230  * efi_install_fdt() - install device tree
 231  *
 232  * If fdt is not EFI_FDT_USE_INTERNAL, the device tree located at that memory
 233  * address will will be installed as configuration table, otherwise the device
 234  * tree located at the address indicated by environment variable fdt_addr or as
 235  * fallback fdtcontroladdr will be used.
 236  *
 237  * On architectures using ACPI tables device trees shall not be installed as
 238  * configuration table.
 239  *
 240  * @fdt:        address of device tree or EFI_FDT_USE_INTERNAL to use the
 241  *              the hardware device tree as indicated by environment variable
 242  *              fdt_addr or as fallback the internal device tree as indicated by
 243  *              the environment variable fdtcontroladdr
 244  * Return:      status code
 245  */
 246 efi_status_t efi_install_fdt(void *fdt)
 247 {
 248         /*
 249          * The EBBR spec requires that we have either an FDT or an ACPI table
 250          * but not both.
 251          */
 252 #if CONFIG_IS_ENABLED(GENERATE_ACPI_TABLE)
 253         if (fdt) {
 254                 printf("ERROR: can't have ACPI table and device tree.\n");
 255                 return EFI_LOAD_ERROR;
 256         }
 257 #else
 258         bootm_headers_t img = { 0 };
 259         efi_status_t ret;
 260
 261         if (fdt == EFI_FDT_USE_INTERNAL) {
 262                 const char *fdt_opt;
 263                 uintptr_t fdt_addr;
 264
 265                 /* Look for device tree that is already installed */
 266                 if (get_config_table(&efi_guid_fdt))
 267                         return EFI_SUCCESS;
 268                 /* Check if there is a hardware device tree */
 269                 fdt_opt = env_get("fdt_addr");
 270                 /* Use our own device tree as fallback */
 271                 if (!fdt_opt) {
 272                         fdt_opt = env_get("fdtcontroladdr");
 273                         if (!fdt_opt) {
 274                                 printf("ERROR: need device tree\n");
 275                                 return EFI_NOT_FOUND;
 276                         }
 277                 }
 278                 fdt_addr = simple_strtoul(fdt_opt, NULL, 16);
 279                 if (!fdt_addr) {
 280                         printf("ERROR: invalid $fdt_addr or $fdtcontroladdr\n");
 281                         return EFI_LOAD_ERROR;
 282                 }
 283                 fdt = map_sysmem(fdt_addr, 0);
 284         }
 285
 286         /* Install device tree */
 287         if (fdt_check_header(fdt)) {
 288                 printf("ERROR: invalid device tree\n");
 289                 return EFI_LOAD_ERROR;
 290         }
 291
 292         /* Prepare device tree for payload */
 293         ret = copy_fdt(&fdt);
 294         if (ret) {
 295                 printf("ERROR: out of memory\n");
 296                 return EFI_OUT_OF_RESOURCES;
 297         }
 298
 299         if (image_setup_libfdt(&img, fdt, 0, NULL)) {
 300                 printf("ERROR: failed to process device tree\n");
 301                 return EFI_LOAD_ERROR;
 302         }
 303
 304         /* Create memory reservations as indicated by the device tree */
 305         efi_carve_out_dt_rsv(fdt);
 306
 307         /* Install device tree as UEFI table */
 308         ret = efi_install_configuration_table(&efi_guid_fdt, fdt);
 309         if (ret != EFI_SUCCESS) {
 310                 printf("ERROR: failed to install device tree\n");
 311                 return ret;
 312         }
 313 #endif /* GENERATE_ACPI_TABLE */
 314
 315         return EFI_SUCCESS;
 316 }
 317
 318 /**
 319  * do_bootefi_exec() - execute EFI binary
 320  *
 321  * @handle:             handle of loaded image
 322  * Return:              status code
 323  *
 324  * Load the EFI binary into a newly assigned memory unwinding the relocation
 325  * information, install the loaded image protocol, and call the binary.
 326  */
 327 static efi_status_t do_bootefi_exec(efi_handle_t handle)
 328 {
 329         efi_status_t ret;
 330         efi_uintn_t exit_data_size = 0;
 331         u16 *exit_data = NULL;
 332         u16 *load_options;
 333
 334         /* Transfer environment variable as load options */
 335         ret = set_load_options(handle, "bootargs", &load_options);
 336         if (ret != EFI_SUCCESS)
 337                 return ret;
 338
 339         /* Call our payload! */
 340         ret = EFI_CALL(efi_start_image(handle, &exit_data_size, &exit_data));
 341         printf("## Application terminated, r = %lu\n", ret & ~EFI_ERROR_MASK);
 342         if (ret && exit_data) {
 343                 printf("## %ls\n", exit_data);
 344                 efi_free_pool(exit_data);
 345         }
 346
 347         efi_restore_gd();
 348
 349         free(load_options);
 350
 351         return ret;
 352 }
 353
 354 /**
 355  * do_efibootmgr() - execute EFI boot manager
 356  *
 357  * Return:      status code
 358  */
 359 static int do_efibootmgr(void)
 360 {
 361         efi_handle_t handle;
 362         efi_status_t ret;
 363
 364         ret = efi_bootmgr_load(&handle);
 365         if (ret != EFI_SUCCESS) {
 366                 printf("EFI boot manager: Cannot load any image\n");
 367                 return CMD_RET_FAILURE;
 368         }
 369
 370         ret = do_bootefi_exec(handle);
 371
 372         if (ret != EFI_SUCCESS)
 373                 return CMD_RET_FAILURE;
 374
 375         return CMD_RET_SUCCESS;
 376 }
 377
 378 /**
 379  * do_bootefi_image() - execute EFI binary
 380  *
 381  * Set up memory image for the binary to be loaded, prepare device path, and
 382  * then call do_bootefi_exec() to execute it.
 383  *
 384  * @image_opt:  string of image start address
 385  * Return:      status code
 386  */
 387 static int do_bootefi_image(const char *image_opt)
 388 {
 389         void *image_buf;
 390         unsigned long addr, size;
 391         const char *size_str;
 392         efi_status_t ret;
 393
 394 #ifdef CONFIG_CMD_BOOTEFI_HELLO
 395         if (!strcmp(image_opt, "hello")) {
 396                 char *saddr;
 397
 398                 saddr = env_get("loadaddr");
 399                 size = __efi_helloworld_end - __efi_helloworld_begin;
 400
 401                 if (saddr)
 402                         addr = simple_strtoul(saddr, NULL, 16);
 403                 else
 404                         addr = CONFIG_SYS_LOAD_ADDR;
 405
 406                 image_buf = map_sysmem(addr, size);
 407                 memcpy(image_buf, __efi_helloworld_begin, size);
 408
 409                 efi_free_pool(bootefi_device_path);
 410                 efi_free_pool(bootefi_image_path);
 411                 bootefi_device_path = NULL;
 412                 bootefi_image_path = NULL;
 413         } else
 414 #endif
 415         {
 416                 size_str = env_get("filesize");
 417                 if (size_str)
 418                         size = simple_strtoul(size_str, NULL, 16);
 419                 else
 420                         size = 0;
 421
 422                 addr = simple_strtoul(image_opt, NULL, 16);
 423                 /* Check that a numeric value was passed */
 424                 if (!addr && *image_opt != '0')
 425                         return CMD_RET_USAGE;
 426
 427                 image_buf = map_sysmem(addr, size);
 428         }
 429         ret = efi_run_image(image_buf, size);
 430
 431         if (ret != EFI_SUCCESS)
 432                 return CMD_RET_FAILURE;
 433
 434         return CMD_RET_SUCCESS;
 435 }
 436
 437 /**
 438  * efi_run_image() - run loaded UEFI image
 439  *
 440  * @source_buffer:      memory address of the UEFI image
 441  * @source_size:        size of the UEFI image
 442  * Return:              status code
 443  */
 444 efi_status_t efi_run_image(void *source_buffer, efi_uintn_t source_size)
 445 {
 446         efi_handle_t mem_handle = NULL, handle;
 447         struct efi_device_path *file_path = NULL;
 448         efi_status_t ret;
 449
 450         if (!bootefi_device_path || !bootefi_image_path) {
 451                 /*
 452                  * Special case for efi payload not loaded from disk,
 453                  * such as 'bootefi hello' or for example payload
 454                  * loaded directly into memory via JTAG, etc:
 455                  */
 456                 file_path = efi_dp_from_mem(EFI_RESERVED_MEMORY_TYPE,
 457                                             (uintptr_t)source_buffer,
 458                                             source_size);
 459                 /*
 460                  * Make sure that device for device_path exist
 461                  * in load_image(). Otherwise, shell and grub will fail.
 462                  */
 463                 ret = efi_create_handle(&mem_handle);
 464                 if (ret != EFI_SUCCESS)
 465                         goto out;
 466
 467                 ret = efi_add_protocol(mem_handle, &efi_guid_device_path,
 468                                        file_path);
 469                 if (ret != EFI_SUCCESS)
 470                         goto out;
 471         } else {
 472                 file_path = efi_dp_append(bootefi_device_path,
 473                                           bootefi_image_path);
 474         }
 475
 476         ret = EFI_CALL(efi_load_image(false, efi_root, file_path, source_buffer,
 477                                       source_size, &handle));
 478         if (ret != EFI_SUCCESS)
 479                 goto out;
 480
 481         ret = do_bootefi_exec(handle);
 482
 483 out:
 484         efi_delete_handle(mem_handle);
 485         efi_free_pool(file_path);
 486         return ret;
 487 }
 488
 489 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
 490 static efi_status_t bootefi_run_prepare(const char *load_options_path,
 491                 struct efi_device_path *device_path,
 492                 struct efi_device_path *image_path,
 493                 struct efi_loaded_image_obj **image_objp,
 494                 struct efi_loaded_image **loaded_image_infop)
 495 {
 496         efi_status_t ret;
 497         u16 *load_options;
 498
 499         ret = efi_setup_loaded_image(device_path, image_path, image_objp,
 500                                      loaded_image_infop);
 501         if (ret != EFI_SUCCESS)
 502                 return ret;
 503
 504         /* Transfer environment variable as load options */
 505         return set_load_options((efi_handle_t)*image_objp, load_options_path,
 506                                 &load_options);
 507 }
 508
 509 /**
 510  * bootefi_test_prepare() - prepare to run an EFI test
 511  *
 512  * Prepare to run a test as if it were provided by a loaded image.
 513  *
 514  * @image_objp:         pointer to be set to the loaded image handle
 515  * @loaded_image_infop: pointer to be set to the loaded image protocol
 516  * @path:               dummy file path used to construct the device path
 517  *                      set in the loaded image protocol
 518  * @load_options_path:  name of a U-Boot environment variable. Its value is
 519  *                      set as load options in the loaded image protocol.
 520  * Return:              status code
 521  */
 522 static efi_status_t bootefi_test_prepare
 523                 (struct efi_loaded_image_obj **image_objp,
 524                  struct efi_loaded_image **loaded_image_infop, const char *path,
 525                  const char *load_options_path)
 526 {
 527         efi_status_t ret;
 528
 529         /* Construct a dummy device path */
 530         bootefi_device_path = efi_dp_from_mem(EFI_RESERVED_MEMORY_TYPE, 0, 0);
 531         if (!bootefi_device_path)
 532                 return EFI_OUT_OF_RESOURCES;
 533
 534         bootefi_image_path = efi_dp_from_file(NULL, 0, path);
 535         if (!bootefi_image_path) {
 536                 ret = EFI_OUT_OF_RESOURCES;
 537                 goto failure;
 538         }
 539
 540         ret = bootefi_run_prepare(load_options_path, bootefi_device_path,
 541                                   bootefi_image_path, image_objp,
 542                                   loaded_image_infop);
 543         if (ret == EFI_SUCCESS)
 544                 return ret;
 545
 546         efi_free_pool(bootefi_image_path);
 547         bootefi_image_path = NULL;
 548 failure:
 549         efi_free_pool(bootefi_device_path);
 550         bootefi_device_path = NULL;
 551         return ret;
 552 }
 553
 554 /**
 555  * bootefi_run_finish() - finish up after running an EFI test
 556  *
 557  * @loaded_image_info: Pointer to a struct which holds the loaded image info
 558  * @image_obj: Pointer to a struct which holds the loaded image object
 559  */
 560 static void bootefi_run_finish(struct efi_loaded_image_obj *image_obj,
 561                                struct efi_loaded_image *loaded_image_info)
 562 {
 563         efi_restore_gd();
 564         free(loaded_image_info->load_options);
 565         efi_delete_handle(&image_obj->header);
 566 }
 567
 568 /**
 569  * do_efi_selftest() - execute EFI selftest
 570  *
 571  * Return:      status code
 572  */
 573 static int do_efi_selftest(void)
 574 {
 575         struct efi_loaded_image_obj *image_obj;
 576         struct efi_loaded_image *loaded_image_info;
 577         efi_status_t ret;
 578
 579         ret = bootefi_test_prepare(&image_obj, &loaded_image_info,
 580                                    "\\selftest", "efi_selftest");
 581         if (ret != EFI_SUCCESS)
 582                 return CMD_RET_FAILURE;
 583
 584         /* Execute the test */
 585         ret = EFI_CALL(efi_selftest(&image_obj->header, &systab));
 586         bootefi_run_finish(image_obj, loaded_image_info);
 587
 588         return ret != EFI_SUCCESS;
 589 }
 590 #endif /* CONFIG_CMD_BOOTEFI_SELFTEST */
 591
 592 /**
 593  * do_bootefi() - execute `bootefi` command
 594  *
 595  * @cmdtp:      table entry describing command
 596  * @flag:       bitmap indicating how the command was invoked
 597  * @argc:       number of arguments
 598  * @argv:       command line arguments
 599  * Return:      status code
 600  */
 601 static int do_bootefi(struct cmd_tbl *cmdtp, int flag, int argc,
 602                       char *const argv[])
 603 {
 604         efi_status_t ret;
 605         void *fdt;
 606
 607         if (argc < 2)
 608                 return CMD_RET_USAGE;
 609
 610         /* Initialize EFI drivers */
 611         ret = efi_init_obj_list();
 612         if (ret != EFI_SUCCESS) {
 613                 printf("Error: Cannot initialize UEFI sub-system, r = %lu\n",
 614                        ret & ~EFI_ERROR_MASK);
 615                 return CMD_RET_FAILURE;
 616         }
 617
 618         if (argc > 2) {
 619                 uintptr_t fdt_addr;
 620
 621                 fdt_addr = simple_strtoul(argv[2], NULL, 16);
 622                 fdt = map_sysmem(fdt_addr, 0);
 623         } else {
 624                 fdt = EFI_FDT_USE_INTERNAL;
 625         }
 626         ret = efi_install_fdt(fdt);
 627         if (ret == EFI_INVALID_PARAMETER)
 628                 return CMD_RET_USAGE;
 629         else if (ret != EFI_SUCCESS)
 630                 return CMD_RET_FAILURE;
 631
 632         if (!strcmp(argv[1], "bootmgr"))
 633                 return do_efibootmgr();
 634 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
 635         else if (!strcmp(argv[1], "selftest"))
 636                 return do_efi_selftest();
 637 #endif
 638
 639         return do_bootefi_image(argv[1]);
 640 }
 641
 642 #ifdef CONFIG_SYS_LONGHELP
 643 static char bootefi_help_text[] =
 644         "<image address> [fdt address]\n"
 645         "  - boot EFI payload stored at address <image address>.\n"
 646         "    If specified, the device tree located at <fdt address> gets\n"
 647         "    exposed as EFI configuration table.\n"
 648 #ifdef CONFIG_CMD_BOOTEFI_HELLO
 649         "bootefi hello\n"
 650         "  - boot a sample Hello World application stored within U-Boot\n"
 651 #endif
 652 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
 653         "bootefi selftest [fdt address]\n"
 654         "  - boot an EFI selftest application stored within U-Boot\n"
 655         "    Use environment variable efi_selftest to select a single test.\n"
 656         "    Use 'setenv efi_selftest list' to enumerate all tests.\n"
 657 #endif
 658         "bootefi bootmgr [fdt address]\n"
 659         "  - load and boot EFI payload based on BootOrder/BootXXXX variables.\n"
 660         "\n"
 661         "    If specified, the device tree located at <fdt address> gets\n"
 662         "    exposed as EFI configuration table.\n";
 663 #endif
 664
 665 U_BOOT_CMD(
 666         bootefi, 3, 0, do_bootefi,
 667         "Boots an EFI payload from memory",
 668         bootefi_help_text
 669 );
 670
 671 /**
 672  * efi_set_bootdev() - set boot device
 673  *
 674  * This function is called when a file is loaded, e.g. via the 'load' command.
 675  * We use the path to this file to inform the UEFI binary about the boot device.
 676  *
 677  * @dev:        device, e.g. "MMC"
 678  * @devnr:      number of the device, e.g. "1:2"
 679  * @path:       path to file loaded
 680  */
 681 void efi_set_bootdev(const char *dev, const char *devnr, const char *path)
 682 {
 683         struct efi_device_path *device, *image;
 684         efi_status_t ret;
 685
 686         /* efi_set_bootdev is typically called repeatedly, recover memory */
 687         efi_free_pool(bootefi_device_path);
 688         efi_free_pool(bootefi_image_path);
 689
 690         ret = efi_dp_from_name(dev, devnr, path, &device, &image);
 691         if (ret == EFI_SUCCESS) {
 692                 bootefi_device_path = device;
 693                 if (image) {
 694                         /* FIXME: image should not contain device */
 695                         struct efi_device_path *image_tmp = image;
 696
 697                         efi_dp_split_file_path(image, &device, &image);
 698                         efi_free_pool(image_tmp);
 699                 }
 700                 bootefi_image_path = image;
 701         } else {
 702                 bootefi_device_path = NULL;
 703                 bootefi_image_path = NULL;
 704         }
 705 }