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 <bootm.h>
  10 #include <charset.h>
  11 #include <command.h>
  12 #include <dm.h>
  13 #include <efi_loader.h>
  14 #include <efi_selftest.h>
  15 #include <errno.h>
  16 #include <linux/libfdt.h>
  17 #include <linux/libfdt_env.h>
  18 #include <mapmem.h>
  19 #include <memalign.h>
  20 #include <asm/global_data.h>
  21 #include <asm-generic/sections.h>
  22 #include <asm-generic/unaligned.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  * Allow unaligned memory access.
  32  *
  33  * This routine is overridden by architectures providing this feature.
  34  */
  35 void __weak allow_unaligned(void)
  36 {
  37 }
  38
  39 /*
  40  * Set the load options of an image from an environment variable.
  41  *
  42  * @handle:     the image handle
  43  * @env_var:    name of the environment variable
  44  * Return:      status code
  45  */
  46 static efi_status_t set_load_options(efi_handle_t handle, const char *env_var)
  47 {
  48         struct efi_loaded_image *loaded_image_info;
  49         size_t size;
  50         const char *env = env_get(env_var);
  51         u16 *pos;
  52         efi_status_t ret;
  53
  54         ret = EFI_CALL(systab.boottime->open_protocol(
  55                                         handle,
  56                                         &efi_guid_loaded_image,
  57                                         (void **)&loaded_image_info,
  58                                         efi_root, NULL,
  59                                         EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL));
  60         if (ret != EFI_SUCCESS)
  61                 return EFI_INVALID_PARAMETER;
  62
  63         loaded_image_info->load_options = NULL;
  64         loaded_image_info->load_options_size = 0;
  65         if (!env)
  66                 goto out;
  67
  68         size = utf8_utf16_strlen(env) + 1;
  69         loaded_image_info->load_options = calloc(size, sizeof(u16));
  70         if (!loaded_image_info->load_options) {
  71                 printf("ERROR: Out of memory\n");
  72                 EFI_CALL(systab.boottime->close_protocol(handle,
  73                                                          &efi_guid_loaded_image,
  74                                                          efi_root, NULL));
  75                 return EFI_OUT_OF_RESOURCES;
  76         }
  77         pos = loaded_image_info->load_options;
  78         utf8_utf16_strcpy(&pos, env);
  79         loaded_image_info->load_options_size = size * 2;
  80
  81 out:
  82         return EFI_CALL(systab.boottime->close_protocol(handle,
  83                                                         &efi_guid_loaded_image,
  84                                                         efi_root, NULL));
  85 }
  86
  87 /**
  88  * copy_fdt() - Copy the device tree to a new location available to EFI
  89  *
  90  * The FDT is copied to a suitable location within the EFI memory map.
  91  * Additional 12 KiB are added to the space in case the device tree needs to be
  92  * expanded later with fdt_open_into().
  93  *
  94  * @fdtp:       On entry a pointer to the flattened device tree.
  95  *              On exit a pointer to the copy of the flattened device tree.
  96  *              FDT start
  97  * Return:      status code
  98  */
  99 static efi_status_t copy_fdt(void **fdtp)
 100 {
 101         unsigned long fdt_ram_start = -1L, fdt_pages;
 102         efi_status_t ret = 0;
 103         void *fdt, *new_fdt;
 104         u64 new_fdt_addr;
 105         uint fdt_size;
 106         int i;
 107
 108         for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
 109                 u64 ram_start = gd->bd->bi_dram[i].start;
 110                 u64 ram_size = gd->bd->bi_dram[i].size;
 111
 112                 if (!ram_size)
 113                         continue;
 114
 115                 if (ram_start < fdt_ram_start)
 116                         fdt_ram_start = ram_start;
 117         }
 118
 119         /*
 120          * Give us at least 12 KiB of breathing room in case the device tree
 121          * needs to be expanded later.
 122          */
 123         fdt = *fdtp;
 124         fdt_pages = efi_size_in_pages(fdt_totalsize(fdt) + 0x3000);
 125         fdt_size = fdt_pages << EFI_PAGE_SHIFT;
 126
 127         /*
 128          * Safe fdt location is at 127 MiB.
 129          * On the sandbox convert from the sandbox address space.
 130          */
 131         new_fdt_addr = (uintptr_t)map_sysmem(fdt_ram_start + 0x7f00000 +
 132                                              fdt_size, 0);
 133         ret = efi_allocate_pages(EFI_ALLOCATE_MAX_ADDRESS,
 134                                  EFI_BOOT_SERVICES_DATA, fdt_pages,
 135                                  &new_fdt_addr);
 136         if (ret != EFI_SUCCESS) {
 137                 /* If we can't put it there, put it somewhere */
 138                 new_fdt_addr = (ulong)memalign(EFI_PAGE_SIZE, fdt_size);
 139                 ret = efi_allocate_pages(EFI_ALLOCATE_MAX_ADDRESS,
 140                                          EFI_BOOT_SERVICES_DATA, fdt_pages,
 141                                          &new_fdt_addr);
 142                 if (ret != EFI_SUCCESS) {
 143                         printf("ERROR: Failed to reserve space for FDT\n");
 144                         goto done;
 145                 }
 146         }
 147         new_fdt = (void *)(uintptr_t)new_fdt_addr;
 148         memcpy(new_fdt, fdt, fdt_totalsize(fdt));
 149         fdt_set_totalsize(new_fdt, fdt_size);
 150
 151         *fdtp = (void *)(uintptr_t)new_fdt_addr;
 152 done:
 153         return ret;
 154 }
 155
 156 /*
 157  * efi_carve_out_dt_rsv() - Carve out DT reserved memory ranges
 158  *
 159  * The mem_rsv entries of the FDT are added to the memory map. Any failures are
 160  * ignored because this is not critical and we would rather continue to try to
 161  * boot.
 162  *
 163  * @fdt: Pointer to device tree
 164  */
 165 static void efi_carve_out_dt_rsv(void *fdt)
 166 {
 167         int nr_rsv, i;
 168         uint64_t addr, size, pages;
 169
 170         nr_rsv = fdt_num_mem_rsv(fdt);
 171
 172         /* Look for an existing entry and add it to the efi mem map. */
 173         for (i = 0; i < nr_rsv; i++) {
 174                 if (fdt_get_mem_rsv(fdt, i, &addr, &size) != 0)
 175                         continue;
 176
 177                 /* Convert from sandbox address space. */
 178                 addr = (uintptr_t)map_sysmem(addr, 0);
 179
 180                 pages = efi_size_in_pages(size + (addr & EFI_PAGE_MASK));
 181                 addr &= ~EFI_PAGE_MASK;
 182                 if (!efi_add_memory_map(addr, pages, EFI_RESERVED_MEMORY_TYPE,
 183                                         false))
 184                         printf("FDT memrsv map %d: Failed to add to map\n", i);
 185         }
 186 }
 187
 188 static efi_status_t efi_install_fdt(ulong fdt_addr)
 189 {
 190         bootm_headers_t img = { 0 };
 191         efi_status_t ret;
 192         void *fdt;
 193
 194         fdt = map_sysmem(fdt_addr, 0);
 195         if (fdt_check_header(fdt)) {
 196                 printf("ERROR: invalid device tree\n");
 197                 return EFI_INVALID_PARAMETER;
 198         }
 199
 200         /* Create memory reservation as indicated by the device tree */
 201         efi_carve_out_dt_rsv(fdt);
 202
 203         /* Prepare fdt for payload */
 204         ret = copy_fdt(&fdt);
 205         if (ret)
 206                 return ret;
 207
 208         if (image_setup_libfdt(&img, fdt, 0, NULL)) {
 209                 printf("ERROR: failed to process device tree\n");
 210                 return EFI_LOAD_ERROR;
 211         }
 212
 213         /* Link to it in the efi tables */
 214         ret = efi_install_configuration_table(&efi_guid_fdt, fdt);
 215         if (ret != EFI_SUCCESS)
 216                 return EFI_OUT_OF_RESOURCES;
 217
 218         return ret;
 219 }
 220
 221 /**
 222  * efi_process_fdt() - process fdt passed by a command argument
 223  * @fdt_opt:    pointer to argument
 224  * Return:      status code
 225  *
 226  * If specified, fdt will be installed as configuration table,
 227  * otherwise no fdt will be passed.
 228  */
 229 static efi_status_t efi_process_fdt(const char *fdt_opt)
 230 {
 231         unsigned long fdt_addr;
 232         efi_status_t ret;
 233
 234         if (fdt_opt) {
 235                 fdt_addr = simple_strtoul(fdt_opt, NULL, 16);
 236                 if (!fdt_addr && *fdt_opt != '0')
 237                         return EFI_INVALID_PARAMETER;
 238
 239                 /* Install device tree */
 240                 ret = efi_install_fdt(fdt_addr);
 241                 if (ret != EFI_SUCCESS) {
 242                         printf("ERROR: failed to install device tree\n");
 243                         return ret;
 244                 }
 245         } else {
 246                 /* Remove device tree. EFI_NOT_FOUND can be ignored here */
 247                 efi_install_configuration_table(&efi_guid_fdt, NULL);
 248         }
 249
 250         return EFI_SUCCESS;
 251 }
 252
 253 static efi_status_t bootefi_run_prepare(const char *load_options_path,
 254                 struct efi_device_path *device_path,
 255                 struct efi_device_path *image_path,
 256                 struct efi_loaded_image_obj **image_objp,
 257                 struct efi_loaded_image **loaded_image_infop)
 258 {
 259         efi_status_t ret;
 260
 261         ret = efi_setup_loaded_image(device_path, image_path, image_objp,
 262                                      loaded_image_infop);
 263         if (ret != EFI_SUCCESS)
 264                 return ret;
 265
 266         /* Transfer environment variable as load options */
 267         return set_load_options((efi_handle_t)*image_objp, load_options_path);
 268 }
 269
 270 /**
 271  * bootefi_run_finish() - finish up after running an EFI test
 272  *
 273  * @loaded_image_info: Pointer to a struct which holds the loaded image info
 274  * @image_objj: Pointer to a struct which holds the loaded image object
 275  */
 276 static void bootefi_run_finish(struct efi_loaded_image_obj *image_obj,
 277                                struct efi_loaded_image *loaded_image_info)
 278 {
 279         efi_restore_gd();
 280         free(loaded_image_info->load_options);
 281         efi_delete_handle(&image_obj->header);
 282 }
 283
 284 /**
 285  * do_bootefi_exec() - execute EFI binary
 286  *
 287  * @efi:                address of the binary
 288  * @device_path:        path of the device from which the binary was loaded
 289  * @image_path:         device path of the binary
 290  * Return:              status code
 291  *
 292  * Load the EFI binary into a newly assigned memory unwinding the relocation
 293  * information, install the loaded image protocol, and call the binary.
 294  */
 295 static efi_status_t do_bootefi_exec(void *efi,
 296                                     struct efi_device_path *device_path,
 297                                     struct efi_device_path *image_path)
 298 {
 299         efi_handle_t mem_handle = NULL;
 300         struct efi_device_path *memdp = NULL;
 301         efi_status_t ret;
 302         struct efi_loaded_image_obj *image_obj = NULL;
 303         struct efi_loaded_image *loaded_image_info = NULL;
 304
 305         /*
 306          * Special case for efi payload not loaded from disk, such as
 307          * 'bootefi hello' or for example payload loaded directly into
 308          * memory via JTAG, etc:
 309          */
 310         if (!device_path && !image_path) {
 311                 printf("WARNING: using memory device/image path, this may confuse some payloads!\n");
 312                 /* actual addresses filled in after efi_load_pe() */
 313                 memdp = efi_dp_from_mem(EFI_RESERVED_MEMORY_TYPE, 0, 0);
 314                 device_path = image_path = memdp;
 315                 /*
 316                  * Grub expects that the device path of the loaded image is
 317                  * installed on a handle.
 318                  */
 319                 ret = efi_create_handle(&mem_handle);
 320                 if (ret != EFI_SUCCESS)
 321                         return ret; /* TODO: leaks device_path */
 322                 ret = efi_add_protocol(mem_handle, &efi_guid_device_path,
 323                                        device_path);
 324                 if (ret != EFI_SUCCESS)
 325                         goto err_add_protocol;
 326         } else {
 327                 assert(device_path && image_path);
 328         }
 329
 330         ret = bootefi_run_prepare("bootargs", device_path, image_path,
 331                                   &image_obj, &loaded_image_info);
 332         if (ret)
 333                 goto err_prepare;
 334
 335         /* Load the EFI payload */
 336         ret = efi_load_pe(image_obj, efi, loaded_image_info);
 337         if (ret != EFI_SUCCESS)
 338                 goto err_prepare;
 339
 340         if (memdp) {
 341                 struct efi_device_path_memory *mdp = (void *)memdp;
 342                 mdp->memory_type = loaded_image_info->image_code_type;
 343                 mdp->start_address = (uintptr_t)loaded_image_info->image_base;
 344                 mdp->end_address = mdp->start_address +
 345                                 loaded_image_info->image_size;
 346         }
 347
 348         /* we don't support much: */
 349         env_set("efi_8be4df61-93ca-11d2-aa0d-00e098032b8c_OsIndicationsSupported",
 350                 "{ro,boot}(blob)0000000000000000");
 351
 352         /* Call our payload! */
 353         debug("%s: Jumping to 0x%p\n", __func__, image_obj->entry);
 354         ret = EFI_CALL(efi_start_image(&image_obj->header, NULL, NULL));
 355
 356 err_prepare:
 357         /* image has returned, loaded-image obj goes *poof*: */
 358         bootefi_run_finish(image_obj, loaded_image_info);
 359
 360 err_add_protocol:
 361         if (mem_handle)
 362                 efi_delete_handle(mem_handle);
 363
 364         return ret;
 365 }
 366
 367 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
 368 /**
 369  * bootefi_test_prepare() - prepare to run an EFI test
 370  *
 371  * Prepare to run a test as if it were provided by a loaded image.
 372  *
 373  * @image_objp:         pointer to be set to the loaded image handle
 374  * @loaded_image_infop: pointer to be set to the loaded image protocol
 375  * @path:               dummy file path used to construct the device path
 376  *                      set in the loaded image protocol
 377  * @load_options_path:  name of a U-Boot environment variable. Its value is
 378  *                      set as load options in the loaded image protocol.
 379  * Return:              status code
 380  */
 381 static efi_status_t bootefi_test_prepare
 382                 (struct efi_loaded_image_obj **image_objp,
 383                  struct efi_loaded_image **loaded_image_infop, const char *path,
 384                  const char *load_options_path)
 385 {
 386         efi_status_t ret;
 387
 388         /* Construct a dummy device path */
 389         bootefi_device_path = efi_dp_from_mem(EFI_RESERVED_MEMORY_TYPE, 0, 0);
 390         if (!bootefi_device_path)
 391                 return EFI_OUT_OF_RESOURCES;
 392
 393         bootefi_image_path = efi_dp_from_file(NULL, 0, path);
 394         if (!bootefi_image_path) {
 395                 ret = EFI_OUT_OF_RESOURCES;
 396                 goto failure;
 397         }
 398
 399         ret = bootefi_run_prepare(load_options_path, bootefi_device_path,
 400                                   bootefi_image_path, image_objp,
 401                                   loaded_image_infop);
 402         if (ret == EFI_SUCCESS)
 403                 return ret;
 404
 405         efi_free_pool(bootefi_image_path);
 406         bootefi_image_path = NULL;
 407 failure:
 408         efi_free_pool(bootefi_device_path);
 409         bootefi_device_path = NULL;
 410         return ret;
 411 }
 412
 413 #endif /* CONFIG_CMD_BOOTEFI_SELFTEST */
 414
 415 static int do_bootefi_bootmgr_exec(void)
 416 {
 417         struct efi_device_path *device_path, *file_path;
 418         void *addr;
 419         efi_status_t r;
 420
 421         addr = efi_bootmgr_load(&device_path, &file_path);
 422         if (!addr)
 423                 return 1;
 424
 425         printf("## Starting EFI application at %p ...\n", addr);
 426         r = do_bootefi_exec(addr, device_path, file_path);
 427         printf("## Application terminated, r = %lu\n",
 428                r & ~EFI_ERROR_MASK);
 429
 430         if (r != EFI_SUCCESS)
 431                 return 1;
 432
 433         return 0;
 434 }
 435
 436 /* Interpreter command to boot an arbitrary EFI image from memory */
 437 static int do_bootefi(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 438 {
 439         unsigned long addr;
 440         char *saddr;
 441         efi_status_t r;
 442
 443         /* Allow unaligned memory access */
 444         allow_unaligned();
 445
 446         switch_to_non_secure_mode();
 447
 448         /* Initialize EFI drivers */
 449         r = efi_init_obj_list();
 450         if (r != EFI_SUCCESS) {
 451                 printf("Error: Cannot set up EFI drivers, r = %lu\n",
 452                        r & ~EFI_ERROR_MASK);
 453                 return CMD_RET_FAILURE;
 454         }
 455
 456         if (argc < 2)
 457                 return CMD_RET_USAGE;
 458
 459         r = efi_process_fdt(argc > 2 ? argv[2] : NULL);
 460         if (r == EFI_INVALID_PARAMETER)
 461                 return CMD_RET_USAGE;
 462         else if (r != EFI_SUCCESS)
 463                 return CMD_RET_FAILURE;
 464
 465 #ifdef CONFIG_CMD_BOOTEFI_HELLO
 466         if (!strcmp(argv[1], "hello")) {
 467                 ulong size = __efi_helloworld_end - __efi_helloworld_begin;
 468
 469                 saddr = env_get("loadaddr");
 470                 if (saddr)
 471                         addr = simple_strtoul(saddr, NULL, 16);
 472                 else
 473                         addr = CONFIG_SYS_LOAD_ADDR;
 474                 memcpy(map_sysmem(addr, size), __efi_helloworld_begin, size);
 475         } else
 476 #endif
 477 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
 478         if (!strcmp(argv[1], "selftest")) {
 479                 struct efi_loaded_image_obj *image_obj;
 480                 struct efi_loaded_image *loaded_image_info;
 481
 482                 r = bootefi_test_prepare(&image_obj, &loaded_image_info,
 483                                          "\\selftest", "efi_selftest");
 484                 if (r != EFI_SUCCESS)
 485                         return CMD_RET_FAILURE;
 486
 487                 /* Execute the test */
 488                 r = EFI_CALL(efi_selftest(&image_obj->header, &systab));
 489                 bootefi_run_finish(image_obj, loaded_image_info);
 490                 return r != EFI_SUCCESS;
 491         } else
 492 #endif
 493         if (!strcmp(argv[1], "bootmgr")) {
 494                 return do_bootefi_bootmgr_exec();
 495         } else {
 496                 saddr = argv[1];
 497
 498                 addr = simple_strtoul(saddr, NULL, 16);
 499                 /* Check that a numeric value was passed */
 500                 if (!addr && *saddr != '0')
 501                         return CMD_RET_USAGE;
 502
 503         }
 504
 505         printf("## Starting EFI application at %08lx ...\n", addr);
 506         r = do_bootefi_exec(map_sysmem(addr, 0), bootefi_device_path,
 507                             bootefi_image_path);
 508         printf("## Application terminated, r = %lu\n",
 509                r & ~EFI_ERROR_MASK);
 510
 511         if (r != EFI_SUCCESS)
 512                 return 1;
 513         else
 514                 return 0;
 515 }
 516
 517 #ifdef CONFIG_SYS_LONGHELP
 518 static char bootefi_help_text[] =
 519         "<image address> [fdt address]\n"
 520         "  - boot EFI payload stored at address <image address>.\n"
 521         "    If specified, the device tree located at <fdt address> gets\n"
 522         "    exposed as EFI configuration table.\n"
 523 #ifdef CONFIG_CMD_BOOTEFI_HELLO
 524         "bootefi hello\n"
 525         "  - boot a sample Hello World application stored within U-Boot\n"
 526 #endif
 527 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
 528         "bootefi selftest [fdt address]\n"
 529         "  - boot an EFI selftest application stored within U-Boot\n"
 530         "    Use environment variable efi_selftest to select a single test.\n"
 531         "    Use 'setenv efi_selftest list' to enumerate all tests.\n"
 532 #endif
 533         "bootefi bootmgr [fdt addr]\n"
 534         "  - load and boot EFI payload based on BootOrder/BootXXXX variables.\n"
 535         "\n"
 536         "    If specified, the device tree located at <fdt address> gets\n"
 537         "    exposed as EFI configuration table.\n";
 538 #endif
 539
 540 U_BOOT_CMD(
 541         bootefi, 3, 0, do_bootefi,
 542         "Boots an EFI payload from memory",
 543         bootefi_help_text
 544 );
 545
 546 void efi_set_bootdev(const char *dev, const char *devnr, const char *path)
 547 {
 548         struct efi_device_path *device, *image;
 549         efi_status_t ret;
 550
 551         /* efi_set_bootdev is typically called repeatedly, recover memory */
 552         efi_free_pool(bootefi_device_path);
 553         efi_free_pool(bootefi_image_path);
 554
 555         ret = efi_dp_from_name(dev, devnr, path, &device, &image);
 556         if (ret == EFI_SUCCESS) {
 557                 bootefi_device_path = device;
 558                 bootefi_image_path = image;
 559         } else {
 560                 bootefi_device_path = NULL;
 561                 bootefi_image_path = NULL;
 562         }
 563 }