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 /**
 189  * efi_install_fdt() - install fdt passed by a command argument
 190  * @fdt_opt:    pointer to argument
 191  * Return:      status code
 192  *
 193  * If specified, fdt will be installed as configuration table,
 194  * otherwise no fdt will be passed.
 195  */
 196 static efi_status_t efi_install_fdt(const char *fdt_opt)
 197 {
 198         unsigned long fdt_addr;
 199         void *fdt;
 200         bootm_headers_t img = { 0 };
 201         efi_status_t ret;
 202
 203         if (fdt_opt) {
 204                 /* Install device tree */
 205                 fdt_addr = simple_strtoul(fdt_opt, NULL, 16);
 206                 if (!fdt_addr && *fdt_opt != '0')
 207                         return EFI_INVALID_PARAMETER;
 208
 209                 fdt = map_sysmem(fdt_addr, 0);
 210                 if (fdt_check_header(fdt)) {
 211                         printf("ERROR: invalid device tree\n");
 212                         return EFI_INVALID_PARAMETER;
 213                 }
 214
 215                 /* Create memory reservation as indicated by the device tree */
 216                 efi_carve_out_dt_rsv(fdt);
 217
 218                 /* Prepare fdt for payload */
 219                 ret = copy_fdt(&fdt);
 220                 if (ret)
 221                         return ret;
 222
 223                 if (image_setup_libfdt(&img, fdt, 0, NULL)) {
 224                         printf("ERROR: failed to process device tree\n");
 225                         return EFI_LOAD_ERROR;
 226                 }
 227
 228                 /* Link to it in the efi tables */
 229                 ret = efi_install_configuration_table(&efi_guid_fdt, fdt);
 230                 if (ret != EFI_SUCCESS) {
 231                         printf("ERROR: failed to install device tree\n");
 232                         return ret;
 233                 }
 234         } else {
 235                 /* Remove device tree. EFI_NOT_FOUND can be ignored here */
 236                 efi_install_configuration_table(&efi_guid_fdt, NULL);
 237         }
 238
 239         return EFI_SUCCESS;
 240 }
 241
 242 static efi_status_t bootefi_run_prepare(const char *load_options_path,
 243                 struct efi_device_path *device_path,
 244                 struct efi_device_path *image_path,
 245                 struct efi_loaded_image_obj **image_objp,
 246                 struct efi_loaded_image **loaded_image_infop)
 247 {
 248         efi_status_t ret;
 249
 250         ret = efi_setup_loaded_image(device_path, image_path, image_objp,
 251                                      loaded_image_infop);
 252         if (ret != EFI_SUCCESS)
 253                 return ret;
 254
 255         /* Transfer environment variable as load options */
 256         return set_load_options((efi_handle_t)*image_objp, load_options_path);
 257 }
 258
 259 /**
 260  * bootefi_run_finish() - finish up after running an EFI test
 261  *
 262  * @loaded_image_info: Pointer to a struct which holds the loaded image info
 263  * @image_objj: Pointer to a struct which holds the loaded image object
 264  */
 265 static void bootefi_run_finish(struct efi_loaded_image_obj *image_obj,
 266                                struct efi_loaded_image *loaded_image_info)
 267 {
 268         efi_restore_gd();
 269         free(loaded_image_info->load_options);
 270         efi_delete_handle(&image_obj->header);
 271 }
 272
 273 /**
 274  * do_bootefi_exec() - execute EFI binary
 275  *
 276  * @efi:                address of the binary
 277  * @device_path:        path of the device from which the binary was loaded
 278  * @image_path:         device path of the binary
 279  * Return:              status code
 280  *
 281  * Load the EFI binary into a newly assigned memory unwinding the relocation
 282  * information, install the loaded image protocol, and call the binary.
 283  */
 284 static efi_status_t do_bootefi_exec(void *efi,
 285                                     struct efi_device_path *device_path,
 286                                     struct efi_device_path *image_path)
 287 {
 288         efi_handle_t mem_handle = NULL;
 289         struct efi_device_path *memdp = NULL;
 290         efi_status_t ret;
 291         struct efi_loaded_image_obj *image_obj = NULL;
 292         struct efi_loaded_image *loaded_image_info = NULL;
 293
 294         /*
 295          * Special case for efi payload not loaded from disk, such as
 296          * 'bootefi hello' or for example payload loaded directly into
 297          * memory via JTAG, etc:
 298          */
 299         if (!device_path && !image_path) {
 300                 printf("WARNING: using memory device/image path, this may confuse some payloads!\n");
 301                 /* actual addresses filled in after efi_load_pe() */
 302                 memdp = efi_dp_from_mem(EFI_RESERVED_MEMORY_TYPE, 0, 0);
 303                 device_path = image_path = memdp;
 304                 /*
 305                  * Grub expects that the device path of the loaded image is
 306                  * installed on a handle.
 307                  */
 308                 ret = efi_create_handle(&mem_handle);
 309                 if (ret != EFI_SUCCESS)
 310                         return ret; /* TODO: leaks device_path */
 311                 ret = efi_add_protocol(mem_handle, &efi_guid_device_path,
 312                                        device_path);
 313                 if (ret != EFI_SUCCESS)
 314                         goto err_add_protocol;
 315         } else {
 316                 assert(device_path && image_path);
 317         }
 318
 319         ret = bootefi_run_prepare("bootargs", device_path, image_path,
 320                                   &image_obj, &loaded_image_info);
 321         if (ret)
 322                 goto err_prepare;
 323
 324         /* Load the EFI payload */
 325         ret = efi_load_pe(image_obj, efi, loaded_image_info);
 326         if (ret != EFI_SUCCESS)
 327                 goto err_prepare;
 328
 329         if (memdp) {
 330                 struct efi_device_path_memory *mdp = (void *)memdp;
 331                 mdp->memory_type = loaded_image_info->image_code_type;
 332                 mdp->start_address = (uintptr_t)loaded_image_info->image_base;
 333                 mdp->end_address = mdp->start_address +
 334                                 loaded_image_info->image_size;
 335         }
 336
 337         /* we don't support much: */
 338         env_set("efi_8be4df61-93ca-11d2-aa0d-00e098032b8c_OsIndicationsSupported",
 339                 "{ro,boot}(blob)0000000000000000");
 340
 341         /* Call our payload! */
 342         debug("%s: Jumping to 0x%p\n", __func__, image_obj->entry);
 343         ret = EFI_CALL(efi_start_image(&image_obj->header, NULL, NULL));
 344
 345 err_prepare:
 346         /* image has returned, loaded-image obj goes *poof*: */
 347         bootefi_run_finish(image_obj, loaded_image_info);
 348
 349 err_add_protocol:
 350         if (mem_handle)
 351                 efi_delete_handle(mem_handle);
 352
 353         return ret;
 354 }
 355
 356 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
 357 /**
 358  * bootefi_test_prepare() - prepare to run an EFI test
 359  *
 360  * Prepare to run a test as if it were provided by a loaded image.
 361  *
 362  * @image_objp:         pointer to be set to the loaded image handle
 363  * @loaded_image_infop: pointer to be set to the loaded image protocol
 364  * @path:               dummy file path used to construct the device path
 365  *                      set in the loaded image protocol
 366  * @load_options_path:  name of a U-Boot environment variable. Its value is
 367  *                      set as load options in the loaded image protocol.
 368  * Return:              status code
 369  */
 370 static efi_status_t bootefi_test_prepare
 371                 (struct efi_loaded_image_obj **image_objp,
 372                  struct efi_loaded_image **loaded_image_infop, const char *path,
 373                  const char *load_options_path)
 374 {
 375         efi_status_t ret;
 376
 377         /* Construct a dummy device path */
 378         bootefi_device_path = efi_dp_from_mem(EFI_RESERVED_MEMORY_TYPE, 0, 0);
 379         if (!bootefi_device_path)
 380                 return EFI_OUT_OF_RESOURCES;
 381
 382         bootefi_image_path = efi_dp_from_file(NULL, 0, path);
 383         if (!bootefi_image_path) {
 384                 ret = EFI_OUT_OF_RESOURCES;
 385                 goto failure;
 386         }
 387
 388         ret = bootefi_run_prepare(load_options_path, bootefi_device_path,
 389                                   bootefi_image_path, image_objp,
 390                                   loaded_image_infop);
 391         if (ret == EFI_SUCCESS)
 392                 return ret;
 393
 394         efi_free_pool(bootefi_image_path);
 395         bootefi_image_path = NULL;
 396 failure:
 397         efi_free_pool(bootefi_device_path);
 398         bootefi_device_path = NULL;
 399         return ret;
 400 }
 401
 402 #endif /* CONFIG_CMD_BOOTEFI_SELFTEST */
 403
 404 static int do_bootefi_bootmgr_exec(void)
 405 {
 406         struct efi_device_path *device_path, *file_path;
 407         void *addr;
 408         efi_status_t r;
 409
 410         addr = efi_bootmgr_load(&device_path, &file_path);
 411         if (!addr)
 412                 return 1;
 413
 414         printf("## Starting EFI application at %p ...\n", addr);
 415         r = do_bootefi_exec(addr, device_path, file_path);
 416         printf("## Application terminated, r = %lu\n",
 417                r & ~EFI_ERROR_MASK);
 418
 419         if (r != EFI_SUCCESS)
 420                 return 1;
 421
 422         return 0;
 423 }
 424
 425 /* Interpreter command to boot an arbitrary EFI image from memory */
 426 static int do_bootefi(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 427 {
 428         unsigned long addr;
 429         char *saddr;
 430         efi_status_t r;
 431
 432         /* Allow unaligned memory access */
 433         allow_unaligned();
 434
 435         switch_to_non_secure_mode();
 436
 437         /* Initialize EFI drivers */
 438         r = efi_init_obj_list();
 439         if (r != EFI_SUCCESS) {
 440                 printf("Error: Cannot set up EFI drivers, r = %lu\n",
 441                        r & ~EFI_ERROR_MASK);
 442                 return CMD_RET_FAILURE;
 443         }
 444
 445         if (argc < 2)
 446                 return CMD_RET_USAGE;
 447
 448         r = efi_install_fdt(argc > 2 ? argv[2] : NULL);
 449         if (r == EFI_INVALID_PARAMETER)
 450                 return CMD_RET_USAGE;
 451         else if (r != EFI_SUCCESS)
 452                 return CMD_RET_FAILURE;
 453
 454 #ifdef CONFIG_CMD_BOOTEFI_HELLO
 455         if (!strcmp(argv[1], "hello")) {
 456                 ulong size = __efi_helloworld_end - __efi_helloworld_begin;
 457
 458                 saddr = env_get("loadaddr");
 459                 if (saddr)
 460                         addr = simple_strtoul(saddr, NULL, 16);
 461                 else
 462                         addr = CONFIG_SYS_LOAD_ADDR;
 463                 memcpy(map_sysmem(addr, size), __efi_helloworld_begin, size);
 464         } else
 465 #endif
 466 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
 467         if (!strcmp(argv[1], "selftest")) {
 468                 struct efi_loaded_image_obj *image_obj;
 469                 struct efi_loaded_image *loaded_image_info;
 470
 471                 r = bootefi_test_prepare(&image_obj, &loaded_image_info,
 472                                          "\\selftest", "efi_selftest");
 473                 if (r != EFI_SUCCESS)
 474                         return CMD_RET_FAILURE;
 475
 476                 /* Execute the test */
 477                 r = EFI_CALL(efi_selftest(&image_obj->header, &systab));
 478                 bootefi_run_finish(image_obj, loaded_image_info);
 479                 return r != EFI_SUCCESS;
 480         } else
 481 #endif
 482         if (!strcmp(argv[1], "bootmgr")) {
 483                 return do_bootefi_bootmgr_exec();
 484         } else {
 485                 saddr = argv[1];
 486
 487                 addr = simple_strtoul(saddr, NULL, 16);
 488                 /* Check that a numeric value was passed */
 489                 if (!addr && *saddr != '0')
 490                         return CMD_RET_USAGE;
 491
 492         }
 493
 494         printf("## Starting EFI application at %08lx ...\n", addr);
 495         r = do_bootefi_exec(map_sysmem(addr, 0), bootefi_device_path,
 496                             bootefi_image_path);
 497         printf("## Application terminated, r = %lu\n",
 498                r & ~EFI_ERROR_MASK);
 499
 500         if (r != EFI_SUCCESS)
 501                 return 1;
 502         else
 503                 return 0;
 504 }
 505
 506 #ifdef CONFIG_SYS_LONGHELP
 507 static char bootefi_help_text[] =
 508         "<image address> [fdt address]\n"
 509         "  - boot EFI payload stored at address <image address>.\n"
 510         "    If specified, the device tree located at <fdt address> gets\n"
 511         "    exposed as EFI configuration table.\n"
 512 #ifdef CONFIG_CMD_BOOTEFI_HELLO
 513         "bootefi hello\n"
 514         "  - boot a sample Hello World application stored within U-Boot\n"
 515 #endif
 516 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
 517         "bootefi selftest [fdt address]\n"
 518         "  - boot an EFI selftest application stored within U-Boot\n"
 519         "    Use environment variable efi_selftest to select a single test.\n"
 520         "    Use 'setenv efi_selftest list' to enumerate all tests.\n"
 521 #endif
 522         "bootefi bootmgr [fdt addr]\n"
 523         "  - load and boot EFI payload based on BootOrder/BootXXXX variables.\n"
 524         "\n"
 525         "    If specified, the device tree located at <fdt address> gets\n"
 526         "    exposed as EFI configuration table.\n";
 527 #endif
 528
 529 U_BOOT_CMD(
 530         bootefi, 3, 0, do_bootefi,
 531         "Boots an EFI payload from memory",
 532         bootefi_help_text
 533 );
 534
 535 void efi_set_bootdev(const char *dev, const char *devnr, const char *path)
 536 {
 537         struct efi_device_path *device, *image;
 538         efi_status_t ret;
 539
 540         /* efi_set_bootdev is typically called repeatedly, recover memory */
 541         efi_free_pool(bootefi_device_path);
 542         efi_free_pool(bootefi_image_path);
 543
 544         ret = efi_dp_from_name(dev, devnr, path, &device, &image);
 545         if (ret == EFI_SUCCESS) {
 546                 bootefi_device_path = device;
 547                 bootefi_image_path = image;
 548         } else {
 549                 bootefi_device_path = NULL;
 550                 bootefi_image_path = NULL;
 551         }
 552 }