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 <errno.h>
  15 #include <linux/libfdt.h>
  16 #include <linux/libfdt_env.h>
  17 #include <mapmem.h>
  18 #include <memalign.h>
  19 #include <asm-generic/sections.h>
  20 #include <linux/linkage.h>
  21
  22 DECLARE_GLOBAL_DATA_PTR;
  23
  24 static struct efi_device_path *bootefi_image_path;
  25 static struct efi_device_path *bootefi_device_path;
  26
  27 /**
  28  * Set the load options of an image from an environment variable.
  29  *
  30  * @handle:     the image handle
  31  * @env_var:    name of the environment variable
  32  * Return:      status code
  33  */
  34 static efi_status_t set_load_options(efi_handle_t handle, const char *env_var)
  35 {
  36         struct efi_loaded_image *loaded_image_info;
  37         size_t size;
  38         const char *env = env_get(env_var);
  39         u16 *pos;
  40         efi_status_t ret;
  41
  42         ret = EFI_CALL(systab.boottime->open_protocol(
  43                                         handle,
  44                                         &efi_guid_loaded_image,
  45                                         (void **)&loaded_image_info,
  46                                         efi_root, NULL,
  47                                         EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL));
  48         if (ret != EFI_SUCCESS)
  49                 return EFI_INVALID_PARAMETER;
  50
  51         loaded_image_info->load_options = NULL;
  52         loaded_image_info->load_options_size = 0;
  53         if (!env)
  54                 goto out;
  55
  56         size = utf8_utf16_strlen(env) + 1;
  57         loaded_image_info->load_options = calloc(size, sizeof(u16));
  58         if (!loaded_image_info->load_options) {
  59                 printf("ERROR: Out of memory\n");
  60                 EFI_CALL(systab.boottime->close_protocol(handle,
  61                                                          &efi_guid_loaded_image,
  62                                                          efi_root, NULL));
  63                 return EFI_OUT_OF_RESOURCES;
  64         }
  65         pos = loaded_image_info->load_options;
  66         utf8_utf16_strcpy(&pos, env);
  67         loaded_image_info->load_options_size = size * 2;
  68
  69 out:
  70         return EFI_CALL(systab.boottime->close_protocol(handle,
  71                                                         &efi_guid_loaded_image,
  72                                                         efi_root, NULL));
  73 }
  74
  75 #if !CONFIG_IS_ENABLED(GENERATE_ACPI_TABLE)
  76
  77 /**
  78  * copy_fdt() - Copy the device tree to a new location available to EFI
  79  *
  80  * The FDT is copied to a suitable location within the EFI memory map.
  81  * Additional 12 KiB are added to the space in case the device tree needs to be
  82  * expanded later with fdt_open_into().
  83  *
  84  * @fdtp:       On entry a pointer to the flattened device tree.
  85  *              On exit a pointer to the copy of the flattened device tree.
  86  *              FDT start
  87  * Return:      status code
  88  */
  89 static efi_status_t copy_fdt(void **fdtp)
  90 {
  91         unsigned long fdt_ram_start = -1L, fdt_pages;
  92         efi_status_t ret = 0;
  93         void *fdt, *new_fdt;
  94         u64 new_fdt_addr;
  95         uint fdt_size;
  96         int i;
  97
  98         for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
  99                 u64 ram_start = gd->bd->bi_dram[i].start;
 100                 u64 ram_size = gd->bd->bi_dram[i].size;
 101
 102                 if (!ram_size)
 103                         continue;
 104
 105                 if (ram_start < fdt_ram_start)
 106                         fdt_ram_start = ram_start;
 107         }
 108
 109         /*
 110          * Give us at least 12 KiB of breathing room in case the device tree
 111          * needs to be expanded later.
 112          */
 113         fdt = *fdtp;
 114         fdt_pages = efi_size_in_pages(fdt_totalsize(fdt) + 0x3000);
 115         fdt_size = fdt_pages << EFI_PAGE_SHIFT;
 116
 117         /*
 118          * Safe fdt location is at 127 MiB.
 119          * On the sandbox convert from the sandbox address space.
 120          */
 121         new_fdt_addr = (uintptr_t)map_sysmem(fdt_ram_start + 0x7f00000 +
 122                                              fdt_size, 0);
 123         ret = efi_allocate_pages(EFI_ALLOCATE_MAX_ADDRESS,
 124                                  EFI_BOOT_SERVICES_DATA, fdt_pages,
 125                                  &new_fdt_addr);
 126         if (ret != EFI_SUCCESS) {
 127                 /* If we can't put it there, put it somewhere */
 128                 new_fdt_addr = (ulong)memalign(EFI_PAGE_SIZE, fdt_size);
 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                         printf("ERROR: Failed to reserve space for FDT\n");
 134                         goto done;
 135                 }
 136         }
 137         new_fdt = (void *)(uintptr_t)new_fdt_addr;
 138         memcpy(new_fdt, fdt, fdt_totalsize(fdt));
 139         fdt_set_totalsize(new_fdt, fdt_size);
 140
 141         *fdtp = (void *)(uintptr_t)new_fdt_addr;
 142 done:
 143         return ret;
 144 }
 145
 146 /**
 147  * efi_carve_out_dt_rsv() - Carve out DT reserved memory ranges
 148  *
 149  * The mem_rsv entries of the FDT are added to the memory map. Any failures are
 150  * ignored because this is not critical and we would rather continue to try to
 151  * boot.
 152  *
 153  * @fdt: Pointer to device tree
 154  */
 155 static void efi_carve_out_dt_rsv(void *fdt)
 156 {
 157         int nr_rsv, i;
 158         uint64_t addr, size, pages;
 159
 160         nr_rsv = fdt_num_mem_rsv(fdt);
 161
 162         /* Look for an existing entry and add it to the efi mem map. */
 163         for (i = 0; i < nr_rsv; i++) {
 164                 if (fdt_get_mem_rsv(fdt, i, &addr, &size) != 0)
 165                         continue;
 166
 167                 /* Convert from sandbox address space. */
 168                 addr = (uintptr_t)map_sysmem(addr, 0);
 169
 170                 pages = efi_size_in_pages(size + (addr & EFI_PAGE_MASK));
 171                 addr &= ~EFI_PAGE_MASK;
 172                 if (efi_add_memory_map(addr, pages, EFI_RESERVED_MEMORY_TYPE,
 173                                        false) != EFI_SUCCESS)
 174                         printf("FDT memrsv map %d: Failed to add to map\n", i);
 175         }
 176 }
 177
 178 /**
 179  * get_config_table() - get configuration table
 180  *
 181  * @guid:       GUID of the configuration table
 182  * Return:      pointer to configuration table or NULL
 183  */
 184 static void *get_config_table(const efi_guid_t *guid)
 185 {
 186         size_t i;
 187
 188         for (i = 0; i < systab.nr_tables; i++) {
 189                 if (!guidcmp(guid, &systab.tables[i].guid))
 190                         return systab.tables[i].table;
 191         }
 192         return NULL;
 193 }
 194
 195 #endif /* !CONFIG_IS_ENABLED(GENERATE_ACPI_TABLE) */
 196
 197 /**
 198  * efi_install_fdt() - install fdt passed by a command argument
 199  *
 200  * If fdt_opt is available, the device tree located at that memory address will
 201  * will be installed as configuration table, otherwise the device tree located
 202  * at the address indicated by environment variable fdtcontroladdr will be used.
 203  *
 204  * On architectures (x86) using ACPI tables device trees shall not be installed
 205  * as configuration table.
 206  *
 207  * @fdt_opt:    pointer to argument
 208  * Return:      status code
 209  */
 210 static efi_status_t efi_install_fdt(const char *fdt_opt)
 211 {
 212         /*
 213          * The EBBR spec requires that we have either an FDT or an ACPI table
 214          * but not both.
 215          */
 216 #if CONFIG_IS_ENABLED(GENERATE_ACPI_TABLE)
 217         if (fdt_opt) {
 218                 printf("ERROR: can't have ACPI table and device tree.\n");
 219                 return EFI_LOAD_ERROR;
 220         }
 221 #else
 222         unsigned long fdt_addr;
 223         void *fdt;
 224         bootm_headers_t img = { 0 };
 225         efi_status_t ret;
 226
 227         if (fdt_opt) {
 228                 fdt_addr = simple_strtoul(fdt_opt, NULL, 16);
 229                 if (!fdt_addr)
 230                         return EFI_INVALID_PARAMETER;
 231         } else {
 232                 /* Look for device tree that is already installed */
 233                 if (get_config_table(&efi_guid_fdt))
 234                         return EFI_SUCCESS;
 235                 /* Use our own device tree as default */
 236                 fdt_opt = env_get("fdtcontroladdr");
 237                 if (!fdt_opt) {
 238                         printf("ERROR: need device tree\n");
 239                         return EFI_NOT_FOUND;
 240                 }
 241                 fdt_addr = simple_strtoul(fdt_opt, NULL, 16);
 242                 if (!fdt_addr) {
 243                         printf("ERROR: invalid $fdtcontroladdr\n");
 244                         return EFI_LOAD_ERROR;
 245                 }
 246         }
 247
 248         /* Install device tree */
 249         fdt = map_sysmem(fdt_addr, 0);
 250         if (fdt_check_header(fdt)) {
 251                 printf("ERROR: invalid device tree\n");
 252                 return EFI_LOAD_ERROR;
 253         }
 254
 255         /* Create memory reservations as indicated by the device tree */
 256         efi_carve_out_dt_rsv(fdt);
 257
 258         /* Prepare device tree for payload */
 259         ret = copy_fdt(&fdt);
 260         if (ret) {
 261                 printf("ERROR: out of memory\n");
 262                 return EFI_OUT_OF_RESOURCES;
 263         }
 264
 265         if (image_setup_libfdt(&img, fdt, 0, NULL)) {
 266                 printf("ERROR: failed to process device tree\n");
 267                 return EFI_LOAD_ERROR;
 268         }
 269
 270         /* Install device tree as UEFI table */
 271         ret = efi_install_configuration_table(&efi_guid_fdt, fdt);
 272         if (ret != EFI_SUCCESS) {
 273                 printf("ERROR: failed to install device tree\n");
 274                 return ret;
 275         }
 276 #endif /* GENERATE_ACPI_TABLE */
 277
 278         return EFI_SUCCESS;
 279 }
 280
 281 /**
 282  * do_bootefi_exec() - execute EFI binary
 283  *
 284  * @handle:             handle of loaded image
 285  * Return:              status code
 286  *
 287  * Load the EFI binary into a newly assigned memory unwinding the relocation
 288  * information, install the loaded image protocol, and call the binary.
 289  */
 290 static efi_status_t do_bootefi_exec(efi_handle_t handle)
 291 {
 292         efi_status_t ret;
 293         efi_uintn_t exit_data_size = 0;
 294         u16 *exit_data = NULL;
 295
 296         /* Transfer environment variable as load options */
 297         ret = set_load_options(handle, "bootargs");
 298         if (ret != EFI_SUCCESS)
 299                 return ret;
 300
 301         /* Call our payload! */
 302         ret = EFI_CALL(efi_start_image(handle, &exit_data_size, &exit_data));
 303         printf("## Application terminated, r = %lu\n", ret & ~EFI_ERROR_MASK);
 304         if (ret && exit_data) {
 305                 printf("## %ls\n", exit_data);
 306                 efi_free_pool(exit_data);
 307         }
 308
 309         efi_restore_gd();
 310
 311         /*
 312          * FIXME: Who is responsible for
 313          *      free(loaded_image_info->load_options);
 314          * Once efi_exit() is implemented correctly,
 315          * handle itself doesn't exist here.
 316          */
 317
 318         return ret;
 319 }
 320
 321 /**
 322  * do_efibootmgr() - execute EFI boot manager
 323  *
 324  * Return:      status code
 325  */
 326 static int do_efibootmgr(void)
 327 {
 328         efi_handle_t handle;
 329         efi_status_t ret;
 330
 331         ret = efi_bootmgr_load(&handle);
 332         if (ret != EFI_SUCCESS) {
 333                 printf("EFI boot manager: Cannot load any image\n");
 334                 return CMD_RET_FAILURE;
 335         }
 336
 337         ret = do_bootefi_exec(handle);
 338
 339         if (ret != EFI_SUCCESS)
 340                 return CMD_RET_FAILURE;
 341
 342         return CMD_RET_SUCCESS;
 343 }
 344
 345 /**
 346  * do_bootefi_image() - execute EFI binary
 347  *
 348  * Set up memory image for the binary to be loaded, prepare device path, and
 349  * then call do_bootefi_exec() to execute it.
 350  *
 351  * @image_opt:  string of image start address
 352  * Return:      status code
 353  */
 354 static int do_bootefi_image(const char *image_opt)
 355 {
 356         void *image_buf;
 357         struct efi_device_path *device_path, *image_path;
 358         struct efi_device_path *file_path = NULL;
 359         unsigned long addr, size;
 360         const char *size_str;
 361         efi_handle_t mem_handle = NULL, handle;
 362         efi_status_t ret;
 363
 364 #ifdef CONFIG_CMD_BOOTEFI_HELLO
 365         if (!strcmp(image_opt, "hello")) {
 366                 char *saddr;
 367
 368                 saddr = env_get("loadaddr");
 369                 size = __efi_helloworld_end - __efi_helloworld_begin;
 370
 371                 if (saddr)
 372                         addr = simple_strtoul(saddr, NULL, 16);
 373                 else
 374                         addr = CONFIG_SYS_LOAD_ADDR;
 375
 376                 image_buf = map_sysmem(addr, size);
 377                 memcpy(image_buf, __efi_helloworld_begin, size);
 378
 379                 device_path = NULL;
 380                 image_path = NULL;
 381         } else
 382 #endif
 383         {
 384                 size_str = env_get("filesize");
 385                 if (size_str)
 386                         size = simple_strtoul(size_str, NULL, 16);
 387                 else
 388                         size = 0;
 389
 390                 addr = simple_strtoul(image_opt, NULL, 16);
 391                 /* Check that a numeric value was passed */
 392                 if (!addr && *image_opt != '0')
 393                         return CMD_RET_USAGE;
 394
 395                 image_buf = map_sysmem(addr, size);
 396
 397                 device_path = bootefi_device_path;
 398                 image_path = bootefi_image_path;
 399         }
 400
 401         if (!device_path && !image_path) {
 402                 /*
 403                  * Special case for efi payload not loaded from disk,
 404                  * such as 'bootefi hello' or for example payload
 405                  * loaded directly into memory via JTAG, etc:
 406                  */
 407                 file_path = efi_dp_from_mem(EFI_RESERVED_MEMORY_TYPE,
 408                                             (uintptr_t)image_buf, size);
 409                 /*
 410                  * Make sure that device for device_path exist
 411                  * in load_image(). Otherwise, shell and grub will fail.
 412                  */
 413                 ret = efi_create_handle(&mem_handle);
 414                 if (ret != EFI_SUCCESS)
 415                         goto out;
 416
 417                 ret = efi_add_protocol(mem_handle, &efi_guid_device_path,
 418                                        file_path);
 419                 if (ret != EFI_SUCCESS)
 420                         goto out;
 421         } else {
 422                 assert(device_path && image_path);
 423                 file_path = efi_dp_append(device_path, image_path);
 424         }
 425
 426         ret = EFI_CALL(efi_load_image(false, efi_root,
 427                                       file_path, image_buf, size, &handle));
 428         if (ret != EFI_SUCCESS)
 429                 goto out;
 430
 431         ret = do_bootefi_exec(handle);
 432
 433 out:
 434         if (mem_handle)
 435                 efi_delete_handle(mem_handle);
 436         if (file_path)
 437                 efi_free_pool(file_path);
 438
 439         if (ret != EFI_SUCCESS)
 440                 return CMD_RET_FAILURE;
 441
 442         return CMD_RET_SUCCESS;
 443 }
 444
 445 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
 446 static efi_status_t bootefi_run_prepare(const char *load_options_path,
 447                 struct efi_device_path *device_path,
 448                 struct efi_device_path *image_path,
 449                 struct efi_loaded_image_obj **image_objp,
 450                 struct efi_loaded_image **loaded_image_infop)
 451 {
 452         efi_status_t ret;
 453
 454         ret = efi_setup_loaded_image(device_path, image_path, image_objp,
 455                                      loaded_image_infop);
 456         if (ret != EFI_SUCCESS)
 457                 return ret;
 458
 459         /* Transfer environment variable as load options */
 460         return set_load_options((efi_handle_t)*image_objp, load_options_path);
 461 }
 462
 463 /**
 464  * bootefi_test_prepare() - prepare to run an EFI test
 465  *
 466  * Prepare to run a test as if it were provided by a loaded image.
 467  *
 468  * @image_objp:         pointer to be set to the loaded image handle
 469  * @loaded_image_infop: pointer to be set to the loaded image protocol
 470  * @path:               dummy file path used to construct the device path
 471  *                      set in the loaded image protocol
 472  * @load_options_path:  name of a U-Boot environment variable. Its value is
 473  *                      set as load options in the loaded image protocol.
 474  * Return:              status code
 475  */
 476 static efi_status_t bootefi_test_prepare
 477                 (struct efi_loaded_image_obj **image_objp,
 478                  struct efi_loaded_image **loaded_image_infop, const char *path,
 479                  const char *load_options_path)
 480 {
 481         efi_status_t ret;
 482
 483         /* Construct a dummy device path */
 484         bootefi_device_path = efi_dp_from_mem(EFI_RESERVED_MEMORY_TYPE, 0, 0);
 485         if (!bootefi_device_path)
 486                 return EFI_OUT_OF_RESOURCES;
 487
 488         bootefi_image_path = efi_dp_from_file(NULL, 0, path);
 489         if (!bootefi_image_path) {
 490                 ret = EFI_OUT_OF_RESOURCES;
 491                 goto failure;
 492         }
 493
 494         ret = bootefi_run_prepare(load_options_path, bootefi_device_path,
 495                                   bootefi_image_path, image_objp,
 496                                   loaded_image_infop);
 497         if (ret == EFI_SUCCESS)
 498                 return ret;
 499
 500         efi_free_pool(bootefi_image_path);
 501         bootefi_image_path = NULL;
 502 failure:
 503         efi_free_pool(bootefi_device_path);
 504         bootefi_device_path = NULL;
 505         return ret;
 506 }
 507
 508 /**
 509  * bootefi_run_finish() - finish up after running an EFI test
 510  *
 511  * @loaded_image_info: Pointer to a struct which holds the loaded image info
 512  * @image_obj: Pointer to a struct which holds the loaded image object
 513  */
 514 static void bootefi_run_finish(struct efi_loaded_image_obj *image_obj,
 515                                struct efi_loaded_image *loaded_image_info)
 516 {
 517         efi_restore_gd();
 518         free(loaded_image_info->load_options);
 519         efi_delete_handle(&image_obj->header);
 520 }
 521
 522 /**
 523  * do_efi_selftest() - execute EFI selftest
 524  *
 525  * Return:      status code
 526  */
 527 static int do_efi_selftest(void)
 528 {
 529         struct efi_loaded_image_obj *image_obj;
 530         struct efi_loaded_image *loaded_image_info;
 531         efi_status_t ret;
 532
 533         ret = bootefi_test_prepare(&image_obj, &loaded_image_info,
 534                                    "\\selftest", "efi_selftest");
 535         if (ret != EFI_SUCCESS)
 536                 return CMD_RET_FAILURE;
 537
 538         /* Execute the test */
 539         ret = EFI_CALL(efi_selftest(&image_obj->header, &systab));
 540         bootefi_run_finish(image_obj, loaded_image_info);
 541
 542         return ret != EFI_SUCCESS;
 543 }
 544 #endif /* CONFIG_CMD_BOOTEFI_SELFTEST */
 545
 546 /**
 547  * do_bootefi() - execute `bootefi` command
 548  *
 549  * @cmdtp:      table entry describing command
 550  * @flag:       bitmap indicating how the command was invoked
 551  * @argc:       number of arguments
 552  * @argv:       command line arguments
 553  * Return:      status code
 554  */
 555 static int do_bootefi(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 556 {
 557         efi_status_t ret;
 558
 559         if (argc < 2)
 560                 return CMD_RET_USAGE;
 561
 562         /* Initialize EFI drivers */
 563         ret = efi_init_obj_list();
 564         if (ret != EFI_SUCCESS) {
 565                 printf("Error: Cannot initialize UEFI sub-system, r = %lu\n",
 566                        ret & ~EFI_ERROR_MASK);
 567                 return CMD_RET_FAILURE;
 568         }
 569
 570         ret = efi_install_fdt(argc > 2 ? argv[2] : NULL);
 571         if (ret == EFI_INVALID_PARAMETER)
 572                 return CMD_RET_USAGE;
 573         else if (ret != EFI_SUCCESS)
 574                 return CMD_RET_FAILURE;
 575
 576         if (!strcmp(argv[1], "bootmgr"))
 577                 return do_efibootmgr();
 578 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
 579         else if (!strcmp(argv[1], "selftest"))
 580                 return do_efi_selftest();
 581 #endif
 582
 583         return do_bootefi_image(argv[1]);
 584 }
 585
 586 #ifdef CONFIG_SYS_LONGHELP
 587 static char bootefi_help_text[] =
 588         "<image address> [fdt address]\n"
 589         "  - boot EFI payload stored at address <image address>.\n"
 590         "    If specified, the device tree located at <fdt address> gets\n"
 591         "    exposed as EFI configuration table.\n"
 592 #ifdef CONFIG_CMD_BOOTEFI_HELLO
 593         "bootefi hello\n"
 594         "  - boot a sample Hello World application stored within U-Boot\n"
 595 #endif
 596 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
 597         "bootefi selftest [fdt address]\n"
 598         "  - boot an EFI selftest application stored within U-Boot\n"
 599         "    Use environment variable efi_selftest to select a single test.\n"
 600         "    Use 'setenv efi_selftest list' to enumerate all tests.\n"
 601 #endif
 602         "bootefi bootmgr [fdt address]\n"
 603         "  - load and boot EFI payload based on BootOrder/BootXXXX variables.\n"
 604         "\n"
 605         "    If specified, the device tree located at <fdt address> gets\n"
 606         "    exposed as EFI configuration table.\n";
 607 #endif
 608
 609 U_BOOT_CMD(
 610         bootefi, 3, 0, do_bootefi,
 611         "Boots an EFI payload from memory",
 612         bootefi_help_text
 613 );
 614
 615 /**
 616  * efi_set_bootdev() - set boot device
 617  *
 618  * This function is called when a file is loaded, e.g. via the 'load' command.
 619  * We use the path to this file to inform the UEFI binary about the boot device.
 620  *
 621  * @dev:        device, e.g. "MMC"
 622  * @devnr:      number of the device, e.g. "1:2"
 623  * @path:       path to file loaded
 624  */
 625 void efi_set_bootdev(const char *dev, const char *devnr, const char *path)
 626 {
 627         struct efi_device_path *device, *image;
 628         efi_status_t ret;
 629
 630         /* efi_set_bootdev is typically called repeatedly, recover memory */
 631         efi_free_pool(bootefi_device_path);
 632         efi_free_pool(bootefi_image_path);
 633
 634         ret = efi_dp_from_name(dev, devnr, path, &device, &image);
 635         if (ret == EFI_SUCCESS) {
 636                 bootefi_device_path = device;
 637                 if (image) {
 638                         /* FIXME: image should not contain device */
 639                         struct efi_device_path *image_tmp = image;
 640
 641                         efi_dp_split_file_path(image, &device, &image);
 642                         efi_free_pool(image_tmp);
 643                 }
 644                 bootefi_image_path = image;
 645         } else {
 646                 bootefi_device_path = NULL;
 647                 bootefi_image_path = NULL;
 648         }
 649 }