1 /* 2 * EFI application loader 3 * 4 * Copyright (c) 2016 Alexander Graf 5 * 6 * SPDX-License-Identifier: GPL-2.0+ 7 */ 8 9 #include <common.h> 10 #include <command.h> 11 #include <dm.h> 12 #include <efi_loader.h> 13 #include <errno.h> 14 #include <libfdt.h> 15 #include <libfdt_env.h> 16 #include <memalign.h> 17 #include <asm/global_data.h> 18 #include <asm-generic/sections.h> 19 #include <linux/linkage.h> 20 21 DECLARE_GLOBAL_DATA_PTR; 22 23 static uint8_t efi_obj_list_initalized; 24 25 static struct efi_device_path *bootefi_image_path; 26 static struct efi_device_path *bootefi_device_path; 27 28 /* Initialize and populate EFI object list */ 29 static void efi_init_obj_list(void) 30 { 31 efi_obj_list_initalized = 1; 32 33 efi_console_register(); 34 #ifdef CONFIG_PARTITIONS 35 efi_disk_register(); 36 #endif 37 #if defined(CONFIG_LCD) || defined(CONFIG_DM_VIDEO) 38 efi_gop_register(); 39 #endif 40 #ifdef CONFIG_NET 41 efi_net_register(); 42 #endif 43 #ifdef CONFIG_GENERATE_SMBIOS_TABLE 44 efi_smbios_register(); 45 #endif 46 47 /* Initialize EFI runtime services */ 48 efi_reset_system_init(); 49 efi_get_time_init(); 50 } 51 52 static void *copy_fdt(void *fdt) 53 { 54 u64 fdt_size = fdt_totalsize(fdt); 55 unsigned long fdt_ram_start = -1L, fdt_pages; 56 u64 new_fdt_addr; 57 void *new_fdt; 58 int i; 59 60 for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) { 61 u64 ram_start = gd->bd->bi_dram[i].start; 62 u64 ram_size = gd->bd->bi_dram[i].size; 63 64 if (!ram_size) 65 continue; 66 67 if (ram_start < fdt_ram_start) 68 fdt_ram_start = ram_start; 69 } 70 71 /* Give us at least 4kb breathing room */ 72 fdt_size = ALIGN(fdt_size + 4096, EFI_PAGE_SIZE); 73 fdt_pages = fdt_size >> EFI_PAGE_SHIFT; 74 75 /* Safe fdt location is at 128MB */ 76 new_fdt_addr = fdt_ram_start + (128 * 1024 * 1024) + fdt_size; 77 if (efi_allocate_pages(1, EFI_BOOT_SERVICES_DATA, fdt_pages, 78 &new_fdt_addr) != EFI_SUCCESS) { 79 /* If we can't put it there, put it somewhere */ 80 new_fdt_addr = (ulong)memalign(EFI_PAGE_SIZE, fdt_size); 81 if (efi_allocate_pages(1, EFI_BOOT_SERVICES_DATA, fdt_pages, 82 &new_fdt_addr) != EFI_SUCCESS) { 83 printf("ERROR: Failed to reserve space for FDT\n"); 84 return NULL; 85 } 86 } 87 88 new_fdt = (void*)(ulong)new_fdt_addr; 89 memcpy(new_fdt, fdt, fdt_totalsize(fdt)); 90 fdt_set_totalsize(new_fdt, fdt_size); 91 92 return new_fdt; 93 } 94 95 static ulong efi_do_enter(void *image_handle, 96 struct efi_system_table *st, 97 asmlinkage ulong (*entry)(void *image_handle, 98 struct efi_system_table *st)) 99 { 100 efi_status_t ret = EFI_LOAD_ERROR; 101 102 if (entry) 103 ret = entry(image_handle, st); 104 st->boottime->exit(image_handle, ret, 0, NULL); 105 return ret; 106 } 107 108 #ifdef CONFIG_ARM64 109 static unsigned long efi_run_in_el2(asmlinkage ulong (*entry)( 110 void *image_handle, struct efi_system_table *st), 111 void *image_handle, struct efi_system_table *st) 112 { 113 /* Enable caches again */ 114 dcache_enable(); 115 116 return efi_do_enter(image_handle, st, entry); 117 } 118 #endif 119 120 /* 121 * Load an EFI payload into a newly allocated piece of memory, register all 122 * EFI objects it would want to access and jump to it. 123 */ 124 static unsigned long do_bootefi_exec(void *efi, void *fdt, 125 struct efi_device_path *device_path, 126 struct efi_device_path *image_path) 127 { 128 struct efi_loaded_image loaded_image_info = {}; 129 struct efi_object loaded_image_info_obj = {}; 130 struct efi_device_path *memdp = NULL; 131 ulong ret; 132 133 ulong (*entry)(void *image_handle, struct efi_system_table *st) 134 asmlinkage; 135 ulong fdt_pages, fdt_size, fdt_start, fdt_end; 136 const efi_guid_t fdt_guid = EFI_FDT_GUID; 137 bootm_headers_t img = { 0 }; 138 139 /* 140 * Special case for efi payload not loaded from disk, such as 141 * 'bootefi hello' or for example payload loaded directly into 142 * memory via jtag/etc: 143 */ 144 if (!device_path && !image_path) { 145 printf("WARNING: using memory device/image path, this may confuse some payloads!\n"); 146 /* actual addresses filled in after efi_load_pe() */ 147 memdp = efi_dp_from_mem(0, 0, 0); 148 device_path = image_path = memdp; 149 } else { 150 assert(device_path && image_path); 151 } 152 153 /* Initialize and populate EFI object list */ 154 if (!efi_obj_list_initalized) 155 efi_init_obj_list(); 156 157 efi_setup_loaded_image(&loaded_image_info, &loaded_image_info_obj, 158 device_path, image_path); 159 160 /* 161 * gd lives in a fixed register which may get clobbered while we execute 162 * the payload. So save it here and restore it on every callback entry 163 */ 164 efi_save_gd(); 165 166 if (fdt && !fdt_check_header(fdt)) { 167 /* Prepare fdt for payload */ 168 fdt = copy_fdt(fdt); 169 170 if (image_setup_libfdt(&img, fdt, 0, NULL)) { 171 printf("ERROR: Failed to process device tree\n"); 172 return -EINVAL; 173 } 174 175 /* Link to it in the efi tables */ 176 efi_install_configuration_table(&fdt_guid, fdt); 177 178 /* And reserve the space in the memory map */ 179 fdt_start = ((ulong)fdt) & ~EFI_PAGE_MASK; 180 fdt_end = ((ulong)fdt) + fdt_totalsize(fdt); 181 fdt_size = (fdt_end - fdt_start) + EFI_PAGE_MASK; 182 fdt_pages = fdt_size >> EFI_PAGE_SHIFT; 183 /* Give a bootloader the chance to modify the device tree */ 184 fdt_pages += 2; 185 efi_add_memory_map(fdt_start, fdt_pages, 186 EFI_BOOT_SERVICES_DATA, true); 187 } else { 188 printf("WARNING: Invalid device tree, expect boot to fail\n"); 189 efi_install_configuration_table(&fdt_guid, NULL); 190 } 191 192 /* Load the EFI payload */ 193 entry = efi_load_pe(efi, &loaded_image_info); 194 if (!entry) { 195 ret = -ENOENT; 196 goto exit; 197 } 198 199 if (memdp) { 200 struct efi_device_path_memory *mdp = (void *)memdp; 201 mdp->memory_type = loaded_image_info.image_code_type; 202 mdp->start_address = (uintptr_t)loaded_image_info.image_base; 203 mdp->end_address = mdp->start_address + 204 loaded_image_info.image_size; 205 } 206 207 /* we don't support much: */ 208 env_set("efi_8be4df61-93ca-11d2-aa0d-00e098032b8c_OsIndicationsSupported", 209 "{ro,boot}(blob)0000000000000000"); 210 211 /* Call our payload! */ 212 debug("%s:%d Jumping to 0x%lx\n", __func__, __LINE__, (long)entry); 213 214 if (setjmp(&loaded_image_info.exit_jmp)) { 215 ret = loaded_image_info.exit_status; 216 goto exit; 217 } 218 219 #ifdef CONFIG_ARM64 220 /* On AArch64 we need to make sure we call our payload in < EL3 */ 221 if (current_el() == 3) { 222 smp_kick_all_cpus(); 223 dcache_disable(); /* flush cache before switch to EL2 */ 224 225 /* Move into EL2 and keep running there */ 226 armv8_switch_to_el2((ulong)entry, (ulong)&loaded_image_info, 227 (ulong)&systab, 0, (ulong)efi_run_in_el2, 228 ES_TO_AARCH64); 229 230 /* Should never reach here, efi exits with longjmp */ 231 while (1) { } 232 } 233 #endif 234 235 ret = efi_do_enter(&loaded_image_info, &systab, entry); 236 237 exit: 238 /* image has returned, loaded-image obj goes *poof*: */ 239 list_del(&loaded_image_info_obj.link); 240 241 return ret; 242 } 243 244 static int do_bootefi_bootmgr_exec(unsigned long fdt_addr) 245 { 246 struct efi_device_path *device_path, *file_path; 247 void *addr; 248 efi_status_t r; 249 250 /* Initialize and populate EFI object list */ 251 if (!efi_obj_list_initalized) 252 efi_init_obj_list(); 253 254 /* 255 * gd lives in a fixed register which may get clobbered while we execute 256 * the payload. So save it here and restore it on every callback entry 257 */ 258 efi_save_gd(); 259 260 addr = efi_bootmgr_load(&device_path, &file_path); 261 if (!addr) 262 return 1; 263 264 printf("## Starting EFI application at %p ...\n", addr); 265 r = do_bootefi_exec(addr, (void *)fdt_addr, device_path, file_path); 266 printf("## Application terminated, r = %lu\n", 267 r & ~EFI_ERROR_MASK); 268 269 if (r != EFI_SUCCESS) 270 return 1; 271 272 return 0; 273 } 274 275 /* Interpreter command to boot an arbitrary EFI image from memory */ 276 static int do_bootefi(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) 277 { 278 char *saddr, *sfdt; 279 unsigned long addr, fdt_addr = 0; 280 unsigned long r; 281 282 if (argc < 2) 283 return CMD_RET_USAGE; 284 #ifdef CONFIG_CMD_BOOTEFI_HELLO 285 if (!strcmp(argv[1], "hello")) { 286 ulong size = __efi_helloworld_end - __efi_helloworld_begin; 287 288 saddr = env_get("loadaddr"); 289 if (saddr) 290 addr = simple_strtoul(saddr, NULL, 16); 291 else 292 addr = CONFIG_SYS_LOAD_ADDR; 293 memcpy((char *)addr, __efi_helloworld_begin, size); 294 } else 295 #endif 296 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST 297 if (!strcmp(argv[1], "selftest")) { 298 struct efi_loaded_image loaded_image_info = {}; 299 struct efi_object loaded_image_info_obj = {}; 300 301 efi_setup_loaded_image(&loaded_image_info, 302 &loaded_image_info_obj, 303 bootefi_device_path, bootefi_image_path); 304 /* 305 * gd lives in a fixed register which may get clobbered while we 306 * execute the payload. So save it here and restore it on every 307 * callback entry 308 */ 309 efi_save_gd(); 310 /* Initialize and populate EFI object list */ 311 if (!efi_obj_list_initalized) 312 efi_init_obj_list(); 313 return efi_selftest(&loaded_image_info, &systab); 314 } else 315 #endif 316 if (!strcmp(argv[1], "bootmgr")) { 317 unsigned long fdt_addr = 0; 318 319 if (argc > 2) 320 fdt_addr = simple_strtoul(argv[2], NULL, 16); 321 322 return do_bootefi_bootmgr_exec(fdt_addr); 323 } else { 324 saddr = argv[1]; 325 326 addr = simple_strtoul(saddr, NULL, 16); 327 328 if (argc > 2) { 329 sfdt = argv[2]; 330 fdt_addr = simple_strtoul(sfdt, NULL, 16); 331 } 332 } 333 334 printf("## Starting EFI application at %08lx ...\n", addr); 335 r = do_bootefi_exec((void *)addr, (void *)fdt_addr, 336 bootefi_device_path, bootefi_image_path); 337 printf("## Application terminated, r = %lu\n", 338 r & ~EFI_ERROR_MASK); 339 340 if (r != EFI_SUCCESS) 341 return 1; 342 else 343 return 0; 344 } 345 346 #ifdef CONFIG_SYS_LONGHELP 347 static char bootefi_help_text[] = 348 "<image address> [fdt address]\n" 349 " - boot EFI payload stored at address <image address>.\n" 350 " If specified, the device tree located at <fdt address> gets\n" 351 " exposed as EFI configuration table.\n" 352 #ifdef CONFIG_CMD_BOOTEFI_HELLO 353 "bootefi hello\n" 354 " - boot a sample Hello World application stored within U-Boot\n" 355 #endif 356 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST 357 "bootefi selftest\n" 358 " - boot an EFI selftest application stored within U-Boot\n" 359 #endif 360 "bootmgr [fdt addr]\n" 361 " - load and boot EFI payload based on BootOrder/BootXXXX variables.\n" 362 "\n" 363 " If specified, the device tree located at <fdt address> gets\n" 364 " exposed as EFI configuration table.\n"; 365 #endif 366 367 U_BOOT_CMD( 368 bootefi, 3, 0, do_bootefi, 369 "Boots an EFI payload from memory", 370 bootefi_help_text 371 ); 372 373 static int parse_partnum(const char *devnr) 374 { 375 const char *str = strchr(devnr, ':'); 376 if (str) { 377 str++; 378 return simple_strtoul(str, NULL, 16); 379 } 380 return 0; 381 } 382 383 void efi_set_bootdev(const char *dev, const char *devnr, const char *path) 384 { 385 char filename[32] = { 0 }; /* dp->str is u16[32] long */ 386 char *s; 387 388 if (strcmp(dev, "Net")) { 389 struct blk_desc *desc; 390 int part; 391 392 desc = blk_get_dev(dev, simple_strtol(devnr, NULL, 10)); 393 part = parse_partnum(devnr); 394 395 bootefi_device_path = efi_dp_from_part(desc, part); 396 } else { 397 #ifdef CONFIG_NET 398 bootefi_device_path = efi_dp_from_eth(); 399 #endif 400 } 401 402 if (!path) 403 return; 404 405 if (strcmp(dev, "Net")) { 406 /* Add leading / to fs paths, because they're absolute */ 407 snprintf(filename, sizeof(filename), "/%s", path); 408 } else { 409 snprintf(filename, sizeof(filename), "%s", path); 410 } 411 /* DOS style file path: */ 412 s = filename; 413 while ((s = strchr(s, '/'))) 414 *s++ = '\\'; 415 bootefi_image_path = efi_dp_from_file(NULL, 0, filename); 416 } 417