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 <charset.h>
   9 #include <common.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 <memalign.h>
  18 #include <asm/global_data.h>
  19 #include <asm-generic/sections.h>
  20 #include <linux/linkage.h>
  21
  22 DECLARE_GLOBAL_DATA_PTR;
  23
  24 #define OBJ_LIST_NOT_INITIALIZED 1
  25
  26 static efi_status_t efi_obj_list_initialized = OBJ_LIST_NOT_INITIALIZED;
  27
  28 static struct efi_device_path *bootefi_image_path;
  29 static struct efi_device_path *bootefi_device_path;
  30
  31 /* Initialize and populate EFI object list */
  32 efi_status_t efi_init_obj_list(void)
  33 {
  34         efi_status_t ret = EFI_SUCCESS;
  35
  36         /* Initialize once only */
  37         if (efi_obj_list_initialized != OBJ_LIST_NOT_INITIALIZED)
  38                 return efi_obj_list_initialized;
  39
  40         /* Initialize EFI driver uclass */
  41         ret = efi_driver_init();
  42         if (ret != EFI_SUCCESS)
  43                 goto out;
  44
  45         ret = efi_console_register();
  46         if (ret != EFI_SUCCESS)
  47                 goto out;
  48 #ifdef CONFIG_PARTITIONS
  49         ret = efi_disk_register();
  50         if (ret != EFI_SUCCESS)
  51                 goto out;
  52 #endif
  53 #if defined(CONFIG_LCD) || defined(CONFIG_DM_VIDEO)
  54         ret = efi_gop_register();
  55         if (ret != EFI_SUCCESS)
  56                 goto out;
  57 #endif
  58 #ifdef CONFIG_NET
  59         ret = efi_net_register();
  60         if (ret != EFI_SUCCESS)
  61                 goto out;
  62 #endif
  63 #ifdef CONFIG_GENERATE_SMBIOS_TABLE
  64         ret = efi_smbios_register();
  65         if (ret != EFI_SUCCESS)
  66                 goto out;
  67 #endif
  68         ret = efi_watchdog_register();
  69         if (ret != EFI_SUCCESS)
  70                 goto out;
  71
  72         /* Initialize EFI runtime services */
  73         ret = efi_reset_system_init();
  74         if (ret != EFI_SUCCESS)
  75                 goto out;
  76         ret = efi_get_time_init();
  77         if (ret != EFI_SUCCESS)
  78                 goto out;
  79
  80 out:
  81         efi_obj_list_initialized = ret;
  82         return ret;
  83 }
  84
  85 /*
  86  * Set the load options of an image from an environment variable.
  87  *
  88  * @loaded_image_info:  the image
  89  * @env_var:            name of the environment variable
  90  */
  91 static void set_load_options(struct efi_loaded_image *loaded_image_info,
  92                              const char *env_var)
  93 {
  94         size_t size;
  95         const char *env = env_get(env_var);
  96
  97         loaded_image_info->load_options = NULL;
  98         loaded_image_info->load_options_size = 0;
  99         if (!env)
 100                 return;
 101         size = strlen(env) + 1;
 102         loaded_image_info->load_options = calloc(size, sizeof(u16));
 103         if (!loaded_image_info->load_options) {
 104                 printf("ERROR: Out of memory\n");
 105                 return;
 106         }
 107         utf8_to_utf16(loaded_image_info->load_options, (u8 *)env, size);
 108         loaded_image_info->load_options_size = size * 2;
 109 }
 110
 111 static void *copy_fdt(void *fdt)
 112 {
 113         u64 fdt_size = fdt_totalsize(fdt);
 114         unsigned long fdt_ram_start = -1L, fdt_pages;
 115         u64 new_fdt_addr;
 116         void *new_fdt;
 117         int i;
 118
 119         for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
 120                 u64 ram_start = gd->bd->bi_dram[i].start;
 121                 u64 ram_size = gd->bd->bi_dram[i].size;
 122
 123                 if (!ram_size)
 124                         continue;
 125
 126                 if (ram_start < fdt_ram_start)
 127                         fdt_ram_start = ram_start;
 128         }
 129
 130         /* Give us at least 4kb breathing room */
 131         fdt_size = ALIGN(fdt_size + 4096, EFI_PAGE_SIZE);
 132         fdt_pages = fdt_size >> EFI_PAGE_SHIFT;
 133
 134         /* Safe fdt location is at 128MB */
 135         new_fdt_addr = fdt_ram_start + (128 * 1024 * 1024) + fdt_size;
 136         if (efi_allocate_pages(1, EFI_RUNTIME_SERVICES_DATA, fdt_pages,
 137                                &new_fdt_addr) != EFI_SUCCESS) {
 138                 /* If we can't put it there, put it somewhere */
 139                 new_fdt_addr = (ulong)memalign(EFI_PAGE_SIZE, fdt_size);
 140                 if (efi_allocate_pages(1, EFI_RUNTIME_SERVICES_DATA, fdt_pages,
 141                                        &new_fdt_addr) != EFI_SUCCESS) {
 142                         printf("ERROR: Failed to reserve space for FDT\n");
 143                         return NULL;
 144                 }
 145         }
 146
 147         new_fdt = (void*)(ulong)new_fdt_addr;
 148         memcpy(new_fdt, fdt, fdt_totalsize(fdt));
 149         fdt_set_totalsize(new_fdt, fdt_size);
 150
 151         return new_fdt;
 152 }
 153
 154 static efi_status_t efi_do_enter(
 155                         efi_handle_t image_handle, struct efi_system_table *st,
 156                         EFIAPI efi_status_t (*entry)(
 157                                 efi_handle_t image_handle,
 158                                 struct efi_system_table *st))
 159 {
 160         efi_status_t ret = EFI_LOAD_ERROR;
 161
 162         if (entry)
 163                 ret = entry(image_handle, st);
 164         st->boottime->exit(image_handle, ret, 0, NULL);
 165         return ret;
 166 }
 167
 168 #ifdef CONFIG_ARM64
 169 static efi_status_t efi_run_in_el2(EFIAPI efi_status_t (*entry)(
 170                         efi_handle_t image_handle, struct efi_system_table *st),
 171                         efi_handle_t image_handle, struct efi_system_table *st)
 172 {
 173         /* Enable caches again */
 174         dcache_enable();
 175
 176         return efi_do_enter(image_handle, st, entry);
 177 }
 178 #endif
 179
 180 /* Carve out DT reserved memory ranges */
 181 static efi_status_t efi_carve_out_dt_rsv(void *fdt)
 182 {
 183         int nr_rsv, i;
 184         uint64_t addr, size, pages;
 185
 186         nr_rsv = fdt_num_mem_rsv(fdt);
 187
 188         /* Look for an existing entry and add it to the efi mem map. */
 189         for (i = 0; i < nr_rsv; i++) {
 190                 if (fdt_get_mem_rsv(fdt, i, &addr, &size) != 0)
 191                         continue;
 192
 193                 pages = ALIGN(size, EFI_PAGE_SIZE) >> EFI_PAGE_SHIFT;
 194                 efi_add_memory_map(addr, pages, EFI_RESERVED_MEMORY_TYPE,
 195                                    false);
 196         }
 197
 198         return EFI_SUCCESS;
 199 }
 200
 201 static efi_status_t efi_install_fdt(void *fdt)
 202 {
 203         bootm_headers_t img = { 0 };
 204         ulong fdt_pages, fdt_size, fdt_start, fdt_end;
 205         efi_status_t ret;
 206
 207         if (fdt_check_header(fdt)) {
 208                 printf("ERROR: invalid device tree\n");
 209                 return EFI_INVALID_PARAMETER;
 210         }
 211
 212         /* Prepare fdt for payload */
 213         fdt = copy_fdt(fdt);
 214         if (!fdt)
 215                 return EFI_OUT_OF_RESOURCES;
 216
 217         if (image_setup_libfdt(&img, fdt, 0, NULL)) {
 218                 printf("ERROR: failed to process device tree\n");
 219                 return EFI_LOAD_ERROR;
 220         }
 221
 222         if (efi_carve_out_dt_rsv(fdt) != EFI_SUCCESS) {
 223                 printf("ERROR: failed to carve out memory\n");
 224                 return EFI_LOAD_ERROR;
 225         }
 226
 227         /* Link to it in the efi tables */
 228         ret = efi_install_configuration_table(&efi_guid_fdt, fdt);
 229         if (ret != EFI_SUCCESS)
 230                 return EFI_OUT_OF_RESOURCES;
 231
 232         /* And reserve the space in the memory map */
 233         fdt_start = ((ulong)fdt) & ~EFI_PAGE_MASK;
 234         fdt_end = ((ulong)fdt) + fdt_totalsize(fdt);
 235         fdt_size = (fdt_end - fdt_start) + EFI_PAGE_MASK;
 236         fdt_pages = fdt_size >> EFI_PAGE_SHIFT;
 237         /* Give a bootloader the chance to modify the device tree */
 238         fdt_pages += 2;
 239         ret = efi_add_memory_map(fdt_start, fdt_pages,
 240                                  EFI_BOOT_SERVICES_DATA, true);
 241         return ret;
 242 }
 243
 244 /*
 245  * Load an EFI payload into a newly allocated piece of memory, register all
 246  * EFI objects it would want to access and jump to it.
 247  */
 248 static efi_status_t do_bootefi_exec(void *efi,
 249                                     struct efi_device_path *device_path,
 250                                     struct efi_device_path *image_path)
 251 {
 252         struct efi_loaded_image loaded_image_info = {};
 253         struct efi_object loaded_image_info_obj = {};
 254         struct efi_device_path *memdp = NULL;
 255         efi_status_t ret;
 256
 257         EFIAPI efi_status_t (*entry)(efi_handle_t image_handle,
 258                                      struct efi_system_table *st);
 259
 260         /*
 261          * Special case for efi payload not loaded from disk, such as
 262          * 'bootefi hello' or for example payload loaded directly into
 263          * memory via jtag/etc:
 264          */
 265         if (!device_path && !image_path) {
 266                 printf("WARNING: using memory device/image path, this may confuse some payloads!\n");
 267                 /* actual addresses filled in after efi_load_pe() */
 268                 memdp = efi_dp_from_mem(0, 0, 0);
 269                 device_path = image_path = memdp;
 270         } else {
 271                 assert(device_path && image_path);
 272         }
 273
 274         efi_setup_loaded_image(&loaded_image_info, &loaded_image_info_obj,
 275                                device_path, image_path);
 276
 277         /*
 278          * gd lives in a fixed register which may get clobbered while we execute
 279          * the payload. So save it here and restore it on every callback entry
 280          */
 281         efi_save_gd();
 282
 283         /* Transfer environment variable bootargs as load options */
 284         set_load_options(&loaded_image_info, "bootargs");
 285         /* Load the EFI payload */
 286         entry = efi_load_pe(efi, &loaded_image_info);
 287         if (!entry) {
 288                 ret = EFI_LOAD_ERROR;
 289                 goto exit;
 290         }
 291
 292         if (memdp) {
 293                 struct efi_device_path_memory *mdp = (void *)memdp;
 294                 mdp->memory_type = loaded_image_info.image_code_type;
 295                 mdp->start_address = (uintptr_t)loaded_image_info.image_base;
 296                 mdp->end_address = mdp->start_address +
 297                                 loaded_image_info.image_size;
 298         }
 299
 300         /* we don't support much: */
 301         env_set("efi_8be4df61-93ca-11d2-aa0d-00e098032b8c_OsIndicationsSupported",
 302                 "{ro,boot}(blob)0000000000000000");
 303
 304         /* Call our payload! */
 305         debug("%s:%d Jumping to 0x%lx\n", __func__, __LINE__, (long)entry);
 306
 307         if (setjmp(&loaded_image_info.exit_jmp)) {
 308                 ret = loaded_image_info.exit_status;
 309                 goto exit;
 310         }
 311
 312 #ifdef CONFIG_ARM64
 313         /* On AArch64 we need to make sure we call our payload in < EL3 */
 314         if (current_el() == 3) {
 315                 smp_kick_all_cpus();
 316                 dcache_disable();       /* flush cache before switch to EL2 */
 317
 318                 /* Move into EL2 and keep running there */
 319                 armv8_switch_to_el2((ulong)entry,
 320                                     (ulong)&loaded_image_info_obj.handle,
 321                                     (ulong)&systab, 0, (ulong)efi_run_in_el2,
 322                                     ES_TO_AARCH64);
 323
 324                 /* Should never reach here, efi exits with longjmp */
 325                 while (1) { }
 326         }
 327 #endif
 328
 329         ret = efi_do_enter(loaded_image_info_obj.handle, &systab, entry);
 330
 331 exit:
 332         /* image has returned, loaded-image obj goes *poof*: */
 333         list_del(&loaded_image_info_obj.link);
 334
 335         return ret;
 336 }
 337
 338 static int do_bootefi_bootmgr_exec(void)
 339 {
 340         struct efi_device_path *device_path, *file_path;
 341         void *addr;
 342         efi_status_t r;
 343
 344         /*
 345          * gd lives in a fixed register which may get clobbered while we execute
 346          * the payload. So save it here and restore it on every callback entry
 347          */
 348         efi_save_gd();
 349
 350         addr = efi_bootmgr_load(&device_path, &file_path);
 351         if (!addr)
 352                 return 1;
 353
 354         printf("## Starting EFI application at %p ...\n", addr);
 355         r = do_bootefi_exec(addr, device_path, file_path);
 356         printf("## Application terminated, r = %lu\n",
 357                r & ~EFI_ERROR_MASK);
 358
 359         if (r != EFI_SUCCESS)
 360                 return 1;
 361
 362         return 0;
 363 }
 364
 365 /* Interpreter command to boot an arbitrary EFI image from memory */
 366 static int do_bootefi(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 367 {
 368         unsigned long addr;
 369         char *saddr;
 370         efi_status_t r;
 371         void *fdt_addr;
 372
 373         /* Initialize EFI drivers */
 374         r = efi_init_obj_list();
 375         if (r != EFI_SUCCESS) {
 376                 printf("Error: Cannot set up EFI drivers, r = %lu\n",
 377                        r & ~EFI_ERROR_MASK);
 378                 return CMD_RET_FAILURE;
 379         }
 380
 381         if (argc < 2)
 382                 return CMD_RET_USAGE;
 383
 384         if (argc > 2) {
 385                 fdt_addr = (void *)simple_strtoul(argv[2], NULL, 16);
 386                 if (!fdt_addr && *argv[2] != '0')
 387                         return CMD_RET_USAGE;
 388                 /* Install device tree */
 389                 r = efi_install_fdt(fdt_addr);
 390                 if (r != EFI_SUCCESS) {
 391                         printf("ERROR: failed to install device tree\n");
 392                         return CMD_RET_FAILURE;
 393                 }
 394         } else {
 395                 /* Remove device tree. EFI_NOT_FOUND can be ignored here */
 396                 efi_install_configuration_table(&efi_guid_fdt, NULL);
 397                 printf("WARNING: booting without device tree\n");
 398         }
 399 #ifdef CONFIG_CMD_BOOTEFI_HELLO
 400         if (!strcmp(argv[1], "hello")) {
 401                 ulong size = __efi_helloworld_end - __efi_helloworld_begin;
 402
 403                 saddr = env_get("loadaddr");
 404                 if (saddr)
 405                         addr = simple_strtoul(saddr, NULL, 16);
 406                 else
 407                         addr = CONFIG_SYS_LOAD_ADDR;
 408                 memcpy((char *)addr, __efi_helloworld_begin, size);
 409         } else
 410 #endif
 411 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
 412         if (!strcmp(argv[1], "selftest")) {
 413                 struct efi_loaded_image loaded_image_info = {};
 414                 struct efi_object loaded_image_info_obj = {};
 415
 416                 /* Construct a dummy device path. */
 417                 bootefi_device_path = efi_dp_from_mem(EFI_RESERVED_MEMORY_TYPE,
 418                                                       (uintptr_t)&efi_selftest,
 419                                                       (uintptr_t)&efi_selftest);
 420                 bootefi_image_path = efi_dp_from_file(NULL, 0, "\\selftest");
 421
 422                 efi_setup_loaded_image(&loaded_image_info,
 423                                        &loaded_image_info_obj,
 424                                        bootefi_device_path, bootefi_image_path);
 425                 /*
 426                  * gd lives in a fixed register which may get clobbered while we
 427                  * execute the payload. So save it here and restore it on every
 428                  * callback entry
 429                  */
 430                 efi_save_gd();
 431                 /* Initialize and populate EFI object list */
 432                 efi_init_obj_list();
 433                 /* Transfer environment variable efi_selftest as load options */
 434                 set_load_options(&loaded_image_info, "efi_selftest");
 435                 /* Execute the test */
 436                 r = efi_selftest(loaded_image_info_obj.handle, &systab);
 437                 efi_restore_gd();
 438                 free(loaded_image_info.load_options);
 439                 list_del(&loaded_image_info_obj.link);
 440                 return r != EFI_SUCCESS;
 441         } else
 442 #endif
 443         if (!strcmp(argv[1], "bootmgr")) {
 444                 return do_bootefi_bootmgr_exec();
 445         } else {
 446                 saddr = argv[1];
 447
 448                 addr = simple_strtoul(saddr, NULL, 16);
 449                 /* Check that a numeric value was passed */
 450                 if (!addr && *saddr != '0')
 451                         return CMD_RET_USAGE;
 452
 453         }
 454
 455         printf("## Starting EFI application at %08lx ...\n", addr);
 456         r = do_bootefi_exec((void *)addr, bootefi_device_path,
 457                             bootefi_image_path);
 458         printf("## Application terminated, r = %lu\n",
 459                r & ~EFI_ERROR_MASK);
 460
 461         if (r != EFI_SUCCESS)
 462                 return 1;
 463         else
 464                 return 0;
 465 }
 466
 467 #ifdef CONFIG_SYS_LONGHELP
 468 static char bootefi_help_text[] =
 469         "<image address> [fdt address]\n"
 470         "  - boot EFI payload stored at address <image address>.\n"
 471         "    If specified, the device tree located at <fdt address> gets\n"
 472         "    exposed as EFI configuration table.\n"
 473 #ifdef CONFIG_CMD_BOOTEFI_HELLO
 474         "bootefi hello\n"
 475         "  - boot a sample Hello World application stored within U-Boot\n"
 476 #endif
 477 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
 478         "bootefi selftest [fdt address]\n"
 479         "  - boot an EFI selftest application stored within U-Boot\n"
 480         "    Use environment variable efi_selftest to select a single test.\n"
 481         "    Use 'setenv efi_selftest list' to enumerate all tests.\n"
 482 #endif
 483         "bootefi bootmgr [fdt addr]\n"
 484         "  - load and boot EFI payload based on BootOrder/BootXXXX variables.\n"
 485         "\n"
 486         "    If specified, the device tree located at <fdt address> gets\n"
 487         "    exposed as EFI configuration table.\n";
 488 #endif
 489
 490 U_BOOT_CMD(
 491         bootefi, 3, 0, do_bootefi,
 492         "Boots an EFI payload from memory",
 493         bootefi_help_text
 494 );
 495
 496 void efi_set_bootdev(const char *dev, const char *devnr, const char *path)
 497 {
 498         char filename[32] = { 0 }; /* dp->str is u16[32] long */
 499         char *s;
 500
 501         if (strcmp(dev, "Net")) {
 502                 struct blk_desc *desc;
 503                 disk_partition_t fs_partition;
 504                 int part;
 505
 506                 part = blk_get_device_part_str(dev, devnr, &desc, &fs_partition,
 507                                                1);
 508                 if (part < 0)
 509                         return;
 510
 511                 bootefi_device_path = efi_dp_from_part(desc, part);
 512         } else {
 513 #ifdef CONFIG_NET
 514                 bootefi_device_path = efi_dp_from_eth();
 515 #endif
 516         }
 517
 518         if (!path)
 519                 return;
 520
 521         if (strcmp(dev, "Net")) {
 522                 /* Add leading / to fs paths, because they're absolute */
 523                 snprintf(filename, sizeof(filename), "/%s", path);
 524         } else {
 525                 snprintf(filename, sizeof(filename), "%s", path);
 526         }
 527         /* DOS style file path: */
 528         s = filename;
 529         while ((s = strchr(s, '/')))
 530                 *s++ = '\\';
 531         bootefi_image_path = efi_dp_from_file(NULL, 0, filename);
 532 }