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 <malloc.h>
  17 #include <linux/libfdt.h>
  18 #include <linux/libfdt_env.h>
  19 #include <mapmem.h>
  20 #include <memalign.h>
  21 #include <asm-generic/sections.h>
  22 #include <linux/linkage.h>
  23
  24 DECLARE_GLOBAL_DATA_PTR;
  25
  26 static struct efi_device_path *bootefi_image_path;
  27 static struct efi_device_path *bootefi_device_path;
  28
  29 /**
  30  * Set the load options of an image from an environment variable.
  31  *
  32  * @handle:             the image handle
  33  * @env_var:            name of the environment variable
  34  * @load_options:       pointer to load options (output)
  35  * Return:              status code
  36  */
  37 static efi_status_t set_load_options(efi_handle_t handle, const char *env_var,
  38                                      u16 **load_options)
  39 {
  40         struct efi_loaded_image *loaded_image_info;
  41         size_t size;
  42         const char *env = env_get(env_var);
  43         u16 *pos;
  44         efi_status_t ret;
  45
  46         *load_options = NULL;
  47         ret = EFI_CALL(systab.boottime->open_protocol(
  48                                         handle,
  49                                         &efi_guid_loaded_image,
  50                                         (void **)&loaded_image_info,
  51                                         efi_root, NULL,
  52                                         EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL));
  53         if (ret != EFI_SUCCESS)
  54                 return EFI_INVALID_PARAMETER;
  55
  56         loaded_image_info->load_options = NULL;
  57         loaded_image_info->load_options_size = 0;
  58         if (!env)
  59                 goto out;
  60
  61         size = utf8_utf16_strlen(env) + 1;
  62         loaded_image_info->load_options = calloc(size, sizeof(u16));
  63         if (!loaded_image_info->load_options) {
  64                 printf("ERROR: Out of memory\n");
  65                 EFI_CALL(systab.boottime->close_protocol(handle,
  66                                                          &efi_guid_loaded_image,
  67                                                          efi_root, NULL));
  68                 return EFI_OUT_OF_RESOURCES;
  69         }
  70         pos = loaded_image_info->load_options;
  71         *load_options = pos;
  72         utf8_utf16_strcpy(&pos, env);
  73         loaded_image_info->load_options_size = size * 2;
  74
  75 out:
  76         return EFI_CALL(systab.boottime->close_protocol(handle,
  77                                                         &efi_guid_loaded_image,
  78                                                         efi_root, NULL));
  79 }
  80
  81 #if !CONFIG_IS_ENABLED(GENERATE_ACPI_TABLE)
  82
  83 /**
  84  * copy_fdt() - Copy the device tree to a new location available to EFI
  85  *
  86  * The FDT is copied to a suitable location within the EFI memory map.
  87  * Additional 12 KiB are added to the space in case the device tree needs to be
  88  * expanded later with fdt_open_into().
  89  *
  90  * @fdtp:       On entry a pointer to the flattened device tree.
  91  *              On exit a pointer to the copy of the flattened device tree.
  92  *              FDT start
  93  * Return:      status code
  94  */
  95 static efi_status_t copy_fdt(void **fdtp)
  96 {
  97         unsigned long fdt_ram_start = -1L, fdt_pages;
  98         efi_status_t ret = 0;
  99         void *fdt, *new_fdt;
 100         u64 new_fdt_addr;
 101         uint fdt_size;
 102         int i;
 103
 104         for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
 105                 u64 ram_start = gd->bd->bi_dram[i].start;
 106                 u64 ram_size = gd->bd->bi_dram[i].size;
 107
 108                 if (!ram_size)
 109                         continue;
 110
 111                 if (ram_start < fdt_ram_start)
 112                         fdt_ram_start = ram_start;
 113         }
 114
 115         /*
 116          * Give us at least 12 KiB of breathing room in case the device tree
 117          * needs to be expanded later.
 118          */
 119         fdt = *fdtp;
 120         fdt_pages = efi_size_in_pages(fdt_totalsize(fdt) + 0x3000);
 121         fdt_size = fdt_pages << EFI_PAGE_SHIFT;
 122
 123         /*
 124          * Safe fdt location is at 127 MiB.
 125          * On the sandbox convert from the sandbox address space.
 126          */
 127         new_fdt_addr = (uintptr_t)map_sysmem(fdt_ram_start + 0x7f00000 +
 128                                              fdt_size, 0);
 129         ret = efi_allocate_pages(EFI_ALLOCATE_MAX_ADDRESS,
 130                                  EFI_BOOT_SERVICES_DATA, fdt_pages,
 131                                  &new_fdt_addr);
 132         if (ret != EFI_SUCCESS) {
 133                 /* If we can't put it there, put it somewhere */
 134                 new_fdt_addr = (ulong)memalign(EFI_PAGE_SIZE, fdt_size);
 135                 ret = efi_allocate_pages(EFI_ALLOCATE_MAX_ADDRESS,
 136                                          EFI_BOOT_SERVICES_DATA, fdt_pages,
 137                                          &new_fdt_addr);
 138                 if (ret != EFI_SUCCESS) {
 139                         printf("ERROR: Failed to reserve space for FDT\n");
 140                         goto done;
 141                 }
 142         }
 143         new_fdt = (void *)(uintptr_t)new_fdt_addr;
 144         memcpy(new_fdt, fdt, fdt_totalsize(fdt));
 145         fdt_set_totalsize(new_fdt, fdt_size);
 146
 147         *fdtp = (void *)(uintptr_t)new_fdt_addr;
 148 done:
 149         return ret;
 150 }
 151
 152 /**
 153  * efi_carve_out_dt_rsv() - Carve out DT reserved memory ranges
 154  *
 155  * The mem_rsv entries of the FDT are added to the memory map. Any failures are
 156  * ignored because this is not critical and we would rather continue to try to
 157  * boot.
 158  *
 159  * @fdt: Pointer to device tree
 160  */
 161 static void efi_carve_out_dt_rsv(void *fdt)
 162 {
 163         int nr_rsv, i;
 164         uint64_t addr, size, pages;
 165
 166         nr_rsv = fdt_num_mem_rsv(fdt);
 167
 168         /* Look for an existing entry and add it to the efi mem map. */
 169         for (i = 0; i < nr_rsv; i++) {
 170                 if (fdt_get_mem_rsv(fdt, i, &addr, &size) != 0)
 171                         continue;
 172
 173                 /* Convert from sandbox address space. */
 174                 addr = (uintptr_t)map_sysmem(addr, 0);
 175
 176                 pages = efi_size_in_pages(size + (addr & EFI_PAGE_MASK));
 177                 addr &= ~EFI_PAGE_MASK;
 178                 if (efi_add_memory_map(addr, pages, EFI_RESERVED_MEMORY_TYPE,
 179                                        false) != EFI_SUCCESS)
 180                         printf("FDT memrsv map %d: Failed to add to map\n", i);
 181         }
 182 }
 183
 184 /**
 185  * get_config_table() - get configuration table
 186  *
 187  * @guid:       GUID of the configuration table
 188  * Return:      pointer to configuration table or NULL
 189  */
 190 static void *get_config_table(const efi_guid_t *guid)
 191 {
 192         size_t i;
 193
 194         for (i = 0; i < systab.nr_tables; i++) {
 195                 if (!guidcmp(guid, &systab.tables[i].guid))
 196                         return systab.tables[i].table;
 197         }
 198         return NULL;
 199 }
 200
 201 #endif /* !CONFIG_IS_ENABLED(GENERATE_ACPI_TABLE) */
 202
 203 /**
 204  * efi_install_fdt() - install device tree
 205  *
 206  * If fdt_addr is available, the device tree located at that memory address will
 207  * will be installed as configuration table, otherwise the device tree located
 208  * at the address indicated by environment variable fdt_addr or as fallback
 209  * fdtcontroladdr will be used.
 210  *
 211  * On architectures using ACPI tables device trees shall not be installed as
 212  * configuration table.
 213  *
 214  * @fdt_addr:   address of device tree or EFI_FDT_USE_INTERNAL to use the
 215  *              the hardware device tree as indicated by environment variable
 216  *              fdt_addr or as fallback the internal device tree as indicated by
 217  *              the environment variable fdtcontroladdr
 218  * Return:      status code
 219  */
 220 efi_status_t efi_install_fdt(void *fdt)
 221 {
 222         /*
 223          * The EBBR spec requires that we have either an FDT or an ACPI table
 224          * but not both.
 225          */
 226 #if CONFIG_IS_ENABLED(GENERATE_ACPI_TABLE)
 227         if (fdt) {
 228                 printf("ERROR: can't have ACPI table and device tree.\n");
 229                 return EFI_LOAD_ERROR;
 230         }
 231 #else
 232         bootm_headers_t img = { 0 };
 233         efi_status_t ret;
 234
 235         if (fdt == EFI_FDT_USE_INTERNAL) {
 236                 const char *fdt_opt;
 237                 uintptr_t fdt_addr;
 238
 239                 /* Look for device tree that is already installed */
 240                 if (get_config_table(&efi_guid_fdt))
 241                         return EFI_SUCCESS;
 242                 /* Check if there is a hardware device tree */
 243                 fdt_opt = env_get("fdt_addr");
 244                 /* Use our own device tree as fallback */
 245                 if (!fdt_opt) {
 246                         fdt_opt = env_get("fdtcontroladdr");
 247                         if (!fdt_opt) {
 248                                 printf("ERROR: need device tree\n");
 249                                 return EFI_NOT_FOUND;
 250                         }
 251                 }
 252                 fdt_addr = simple_strtoul(fdt_opt, NULL, 16);
 253                 if (!fdt_addr) {
 254                         printf("ERROR: invalid $fdt_addr or $fdtcontroladdr\n");
 255                         return EFI_LOAD_ERROR;
 256                 }
 257                 fdt = map_sysmem(fdt_addr, 0);
 258         }
 259
 260         /* Install device tree */
 261         if (fdt_check_header(fdt)) {
 262                 printf("ERROR: invalid device tree\n");
 263                 return EFI_LOAD_ERROR;
 264         }
 265
 266         /* Create memory reservations as indicated by the device tree */
 267         efi_carve_out_dt_rsv(fdt);
 268
 269         /* Prepare device tree for payload */
 270         ret = copy_fdt(&fdt);
 271         if (ret) {
 272                 printf("ERROR: out of memory\n");
 273                 return EFI_OUT_OF_RESOURCES;
 274         }
 275
 276         if (image_setup_libfdt(&img, fdt, 0, NULL)) {
 277                 printf("ERROR: failed to process device tree\n");
 278                 return EFI_LOAD_ERROR;
 279         }
 280
 281         /* Install device tree as UEFI table */
 282         ret = efi_install_configuration_table(&efi_guid_fdt, fdt);
 283         if (ret != EFI_SUCCESS) {
 284                 printf("ERROR: failed to install device tree\n");
 285                 return ret;
 286         }
 287 #endif /* GENERATE_ACPI_TABLE */
 288
 289         return EFI_SUCCESS;
 290 }
 291
 292 /**
 293  * do_bootefi_exec() - execute EFI binary
 294  *
 295  * @handle:             handle of loaded image
 296  * Return:              status code
 297  *
 298  * Load the EFI binary into a newly assigned memory unwinding the relocation
 299  * information, install the loaded image protocol, and call the binary.
 300  */
 301 static efi_status_t do_bootefi_exec(efi_handle_t handle)
 302 {
 303         efi_status_t ret;
 304         efi_uintn_t exit_data_size = 0;
 305         u16 *exit_data = NULL;
 306         u16 *load_options;
 307
 308         /* Transfer environment variable as load options */
 309         ret = set_load_options(handle, "bootargs", &load_options);
 310         if (ret != EFI_SUCCESS)
 311                 return ret;
 312
 313         /* Call our payload! */
 314         ret = EFI_CALL(efi_start_image(handle, &exit_data_size, &exit_data));
 315         printf("## Application terminated, r = %lu\n", ret & ~EFI_ERROR_MASK);
 316         if (ret && exit_data) {
 317                 printf("## %ls\n", exit_data);
 318                 efi_free_pool(exit_data);
 319         }
 320
 321         efi_restore_gd();
 322
 323         free(load_options);
 324
 325         return ret;
 326 }
 327
 328 /**
 329  * do_efibootmgr() - execute EFI boot manager
 330  *
 331  * Return:      status code
 332  */
 333 static int do_efibootmgr(void)
 334 {
 335         efi_handle_t handle;
 336         efi_status_t ret;
 337
 338         ret = efi_bootmgr_load(&handle);
 339         if (ret != EFI_SUCCESS) {
 340                 printf("EFI boot manager: Cannot load any image\n");
 341                 return CMD_RET_FAILURE;
 342         }
 343
 344         ret = do_bootefi_exec(handle);
 345
 346         if (ret != EFI_SUCCESS)
 347                 return CMD_RET_FAILURE;
 348
 349         return CMD_RET_SUCCESS;
 350 }
 351
 352 /**
 353  * do_bootefi_image() - execute EFI binary
 354  *
 355  * Set up memory image for the binary to be loaded, prepare device path, and
 356  * then call do_bootefi_exec() to execute it.
 357  *
 358  * @image_opt:  string of image start address
 359  * Return:      status code
 360  */
 361 static int do_bootefi_image(const char *image_opt)
 362 {
 363         void *image_buf;
 364         unsigned long addr, size;
 365         const char *size_str;
 366         efi_status_t ret;
 367
 368 #ifdef CONFIG_CMD_BOOTEFI_HELLO
 369         if (!strcmp(image_opt, "hello")) {
 370                 char *saddr;
 371
 372                 saddr = env_get("loadaddr");
 373                 size = __efi_helloworld_end - __efi_helloworld_begin;
 374
 375                 if (saddr)
 376                         addr = simple_strtoul(saddr, NULL, 16);
 377                 else
 378                         addr = CONFIG_SYS_LOAD_ADDR;
 379
 380                 image_buf = map_sysmem(addr, size);
 381                 memcpy(image_buf, __efi_helloworld_begin, size);
 382
 383                 efi_free_pool(bootefi_device_path);
 384                 efi_free_pool(bootefi_image_path);
 385                 bootefi_device_path = NULL;
 386                 bootefi_image_path = NULL;
 387         } else
 388 #endif
 389         {
 390                 size_str = env_get("filesize");
 391                 if (size_str)
 392                         size = simple_strtoul(size_str, NULL, 16);
 393                 else
 394                         size = 0;
 395
 396                 addr = simple_strtoul(image_opt, NULL, 16);
 397                 /* Check that a numeric value was passed */
 398                 if (!addr && *image_opt != '0')
 399                         return CMD_RET_USAGE;
 400
 401                 image_buf = map_sysmem(addr, size);
 402         }
 403         ret = efi_run_image(image_buf, size);
 404
 405         if (ret != EFI_SUCCESS)
 406                 return CMD_RET_FAILURE;
 407
 408         return CMD_RET_SUCCESS;
 409 }
 410
 411 /**
 412  * efi_run_image() - run loaded UEFI image
 413  *
 414  * @source_buffer:      memory address of the UEFI image
 415  * @source_size:        size of the UEFI image
 416  * Return:              status code
 417  */
 418 efi_status_t efi_run_image(void *source_buffer, efi_uintn_t source_size)
 419 {
 420         efi_handle_t mem_handle = NULL, handle;
 421         struct efi_device_path *file_path = NULL;
 422         efi_status_t ret;
 423
 424         if (!bootefi_device_path || !bootefi_image_path) {
 425                 /*
 426                  * Special case for efi payload not loaded from disk,
 427                  * such as 'bootefi hello' or for example payload
 428                  * loaded directly into memory via JTAG, etc:
 429                  */
 430                 file_path = efi_dp_from_mem(EFI_RESERVED_MEMORY_TYPE,
 431                                             (uintptr_t)source_buffer,
 432                                             source_size);
 433                 /*
 434                  * Make sure that device for device_path exist
 435                  * in load_image(). Otherwise, shell and grub will fail.
 436                  */
 437                 ret = efi_create_handle(&mem_handle);
 438                 if (ret != EFI_SUCCESS)
 439                         goto out;
 440
 441                 ret = efi_add_protocol(mem_handle, &efi_guid_device_path,
 442                                        file_path);
 443                 if (ret != EFI_SUCCESS)
 444                         goto out;
 445         } else {
 446                 file_path = efi_dp_append(bootefi_device_path,
 447                                           bootefi_image_path);
 448         }
 449
 450         ret = EFI_CALL(efi_load_image(false, efi_root, file_path, source_buffer,
 451                                       source_size, &handle));
 452         if (ret != EFI_SUCCESS)
 453                 goto out;
 454
 455         ret = do_bootefi_exec(handle);
 456
 457 out:
 458         if (mem_handle)
 459                 efi_delete_handle(mem_handle);
 460         if (file_path)
 461                 efi_free_pool(file_path);
 462         return ret;
 463 }
 464
 465 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
 466 static efi_status_t bootefi_run_prepare(const char *load_options_path,
 467                 struct efi_device_path *device_path,
 468                 struct efi_device_path *image_path,
 469                 struct efi_loaded_image_obj **image_objp,
 470                 struct efi_loaded_image **loaded_image_infop)
 471 {
 472         efi_status_t ret;
 473         u16 *load_options;
 474
 475         ret = efi_setup_loaded_image(device_path, image_path, image_objp,
 476                                      loaded_image_infop);
 477         if (ret != EFI_SUCCESS)
 478                 return ret;
 479
 480         /* Transfer environment variable as load options */
 481         return set_load_options((efi_handle_t)*image_objp, load_options_path,
 482                                 &load_options);
 483 }
 484
 485 /**
 486  * bootefi_test_prepare() - prepare to run an EFI test
 487  *
 488  * Prepare to run a test as if it were provided by a loaded image.
 489  *
 490  * @image_objp:         pointer to be set to the loaded image handle
 491  * @loaded_image_infop: pointer to be set to the loaded image protocol
 492  * @path:               dummy file path used to construct the device path
 493  *                      set in the loaded image protocol
 494  * @load_options_path:  name of a U-Boot environment variable. Its value is
 495  *                      set as load options in the loaded image protocol.
 496  * Return:              status code
 497  */
 498 static efi_status_t bootefi_test_prepare
 499                 (struct efi_loaded_image_obj **image_objp,
 500                  struct efi_loaded_image **loaded_image_infop, const char *path,
 501                  const char *load_options_path)
 502 {
 503         efi_status_t ret;
 504
 505         /* Construct a dummy device path */
 506         bootefi_device_path = efi_dp_from_mem(EFI_RESERVED_MEMORY_TYPE, 0, 0);
 507         if (!bootefi_device_path)
 508                 return EFI_OUT_OF_RESOURCES;
 509
 510         bootefi_image_path = efi_dp_from_file(NULL, 0, path);
 511         if (!bootefi_image_path) {
 512                 ret = EFI_OUT_OF_RESOURCES;
 513                 goto failure;
 514         }
 515
 516         ret = bootefi_run_prepare(load_options_path, bootefi_device_path,
 517                                   bootefi_image_path, image_objp,
 518                                   loaded_image_infop);
 519         if (ret == EFI_SUCCESS)
 520                 return ret;
 521
 522         efi_free_pool(bootefi_image_path);
 523         bootefi_image_path = NULL;
 524 failure:
 525         efi_free_pool(bootefi_device_path);
 526         bootefi_device_path = NULL;
 527         return ret;
 528 }
 529
 530 /**
 531  * bootefi_run_finish() - finish up after running an EFI test
 532  *
 533  * @loaded_image_info: Pointer to a struct which holds the loaded image info
 534  * @image_obj: Pointer to a struct which holds the loaded image object
 535  */
 536 static void bootefi_run_finish(struct efi_loaded_image_obj *image_obj,
 537                                struct efi_loaded_image *loaded_image_info)
 538 {
 539         efi_restore_gd();
 540         free(loaded_image_info->load_options);
 541         efi_delete_handle(&image_obj->header);
 542 }
 543
 544 /**
 545  * do_efi_selftest() - execute EFI selftest
 546  *
 547  * Return:      status code
 548  */
 549 static int do_efi_selftest(void)
 550 {
 551         struct efi_loaded_image_obj *image_obj;
 552         struct efi_loaded_image *loaded_image_info;
 553         efi_status_t ret;
 554
 555         ret = bootefi_test_prepare(&image_obj, &loaded_image_info,
 556                                    "\\selftest", "efi_selftest");
 557         if (ret != EFI_SUCCESS)
 558                 return CMD_RET_FAILURE;
 559
 560         /* Execute the test */
 561         ret = EFI_CALL(efi_selftest(&image_obj->header, &systab));
 562         bootefi_run_finish(image_obj, loaded_image_info);
 563
 564         return ret != EFI_SUCCESS;
 565 }
 566 #endif /* CONFIG_CMD_BOOTEFI_SELFTEST */
 567
 568 /**
 569  * do_bootefi() - execute `bootefi` command
 570  *
 571  * @cmdtp:      table entry describing command
 572  * @flag:       bitmap indicating how the command was invoked
 573  * @argc:       number of arguments
 574  * @argv:       command line arguments
 575  * Return:      status code
 576  */
 577 static int do_bootefi(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 578 {
 579         efi_status_t ret;
 580         void *fdt;
 581
 582         if (argc < 2)
 583                 return CMD_RET_USAGE;
 584
 585         /* Initialize EFI drivers */
 586         ret = efi_init_obj_list();
 587         if (ret != EFI_SUCCESS) {
 588                 printf("Error: Cannot initialize UEFI sub-system, r = %lu\n",
 589                        ret & ~EFI_ERROR_MASK);
 590                 return CMD_RET_FAILURE;
 591         }
 592
 593         if (argc > 2) {
 594                 uintptr_t fdt_addr;
 595
 596                 fdt_addr = simple_strtoul(argv[2], NULL, 16);
 597                 fdt = map_sysmem(fdt_addr, 0);
 598         } else {
 599                 fdt = EFI_FDT_USE_INTERNAL;
 600         }
 601         ret = efi_install_fdt(fdt);
 602         if (ret == EFI_INVALID_PARAMETER)
 603                 return CMD_RET_USAGE;
 604         else if (ret != EFI_SUCCESS)
 605                 return CMD_RET_FAILURE;
 606
 607         if (!strcmp(argv[1], "bootmgr"))
 608                 return do_efibootmgr();
 609 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
 610         else if (!strcmp(argv[1], "selftest"))
 611                 return do_efi_selftest();
 612 #endif
 613
 614         return do_bootefi_image(argv[1]);
 615 }
 616
 617 #ifdef CONFIG_SYS_LONGHELP
 618 static char bootefi_help_text[] =
 619         "<image address> [fdt address]\n"
 620         "  - boot EFI payload stored at address <image address>.\n"
 621         "    If specified, the device tree located at <fdt address> gets\n"
 622         "    exposed as EFI configuration table.\n"
 623 #ifdef CONFIG_CMD_BOOTEFI_HELLO
 624         "bootefi hello\n"
 625         "  - boot a sample Hello World application stored within U-Boot\n"
 626 #endif
 627 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
 628         "bootefi selftest [fdt address]\n"
 629         "  - boot an EFI selftest application stored within U-Boot\n"
 630         "    Use environment variable efi_selftest to select a single test.\n"
 631         "    Use 'setenv efi_selftest list' to enumerate all tests.\n"
 632 #endif
 633         "bootefi bootmgr [fdt address]\n"
 634         "  - load and boot EFI payload based on BootOrder/BootXXXX variables.\n"
 635         "\n"
 636         "    If specified, the device tree located at <fdt address> gets\n"
 637         "    exposed as EFI configuration table.\n";
 638 #endif
 639
 640 U_BOOT_CMD(
 641         bootefi, 3, 0, do_bootefi,
 642         "Boots an EFI payload from memory",
 643         bootefi_help_text
 644 );
 645
 646 /**
 647  * efi_set_bootdev() - set boot device
 648  *
 649  * This function is called when a file is loaded, e.g. via the 'load' command.
 650  * We use the path to this file to inform the UEFI binary about the boot device.
 651  *
 652  * @dev:        device, e.g. "MMC"
 653  * @devnr:      number of the device, e.g. "1:2"
 654  * @path:       path to file loaded
 655  */
 656 void efi_set_bootdev(const char *dev, const char *devnr, const char *path)
 657 {
 658         struct efi_device_path *device, *image;
 659         efi_status_t ret;
 660
 661         /* efi_set_bootdev is typically called repeatedly, recover memory */
 662         efi_free_pool(bootefi_device_path);
 663         efi_free_pool(bootefi_image_path);
 664
 665         ret = efi_dp_from_name(dev, devnr, path, &device, &image);
 666         if (ret == EFI_SUCCESS) {
 667                 bootefi_device_path = device;
 668                 if (image) {
 669                         /* FIXME: image should not contain device */
 670                         struct efi_device_path *image_tmp = image;
 671
 672                         efi_dp_split_file_path(image, &device, &image);
 673                         efi_free_pool(image_tmp);
 674                 }
 675                 bootefi_image_path = image;
 676         } else {
 677                 bootefi_device_path = NULL;
 678                 bootefi_image_path = NULL;
 679         }
 680 }