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 ulong ret; 131 132 ulong (*entry)(void *image_handle, struct efi_system_table *st) 133 asmlinkage; 134 ulong fdt_pages, fdt_size, fdt_start, fdt_end; 135 const efi_guid_t fdt_guid = EFI_FDT_GUID; 136 bootm_headers_t img = { 0 }; 137 138 /* Initialize and populate EFI object list */ 139 if (!efi_obj_list_initalized) 140 efi_init_obj_list(); 141 142 efi_setup_loaded_image(&loaded_image_info, &loaded_image_info_obj, 143 device_path, image_path); 144 145 /* 146 * gd lives in a fixed register which may get clobbered while we execute 147 * the payload. So save it here and restore it on every callback entry 148 */ 149 efi_save_gd(); 150 151 if (fdt && !fdt_check_header(fdt)) { 152 /* Prepare fdt for payload */ 153 fdt = copy_fdt(fdt); 154 155 if (image_setup_libfdt(&img, fdt, 0, NULL)) { 156 printf("ERROR: Failed to process device tree\n"); 157 return -EINVAL; 158 } 159 160 /* Link to it in the efi tables */ 161 efi_install_configuration_table(&fdt_guid, fdt); 162 163 /* And reserve the space in the memory map */ 164 fdt_start = ((ulong)fdt) & ~EFI_PAGE_MASK; 165 fdt_end = ((ulong)fdt) + fdt_totalsize(fdt); 166 fdt_size = (fdt_end - fdt_start) + EFI_PAGE_MASK; 167 fdt_pages = fdt_size >> EFI_PAGE_SHIFT; 168 /* Give a bootloader the chance to modify the device tree */ 169 fdt_pages += 2; 170 efi_add_memory_map(fdt_start, fdt_pages, 171 EFI_BOOT_SERVICES_DATA, true); 172 } else { 173 printf("WARNING: Invalid device tree, expect boot to fail\n"); 174 efi_install_configuration_table(&fdt_guid, NULL); 175 } 176 177 /* Load the EFI payload */ 178 entry = efi_load_pe(efi, &loaded_image_info); 179 if (!entry) { 180 ret = -ENOENT; 181 goto exit; 182 } 183 184 /* we don't support much: */ 185 env_set("efi_8be4df61-93ca-11d2-aa0d-00e098032b8c_OsIndicationsSupported", 186 "{ro,boot}(blob)0000000000000000"); 187 188 /* Call our payload! */ 189 debug("%s:%d Jumping to 0x%lx\n", __func__, __LINE__, (long)entry); 190 191 if (setjmp(&loaded_image_info.exit_jmp)) { 192 ret = loaded_image_info.exit_status; 193 goto exit; 194 } 195 196 #ifdef CONFIG_ARM64 197 /* On AArch64 we need to make sure we call our payload in < EL3 */ 198 if (current_el() == 3) { 199 smp_kick_all_cpus(); 200 dcache_disable(); /* flush cache before switch to EL2 */ 201 202 /* Move into EL2 and keep running there */ 203 armv8_switch_to_el2((ulong)entry, (ulong)&loaded_image_info, 204 (ulong)&systab, 0, (ulong)efi_run_in_el2, 205 ES_TO_AARCH64); 206 207 /* Should never reach here, efi exits with longjmp */ 208 while (1) { } 209 } 210 #endif 211 212 ret = efi_do_enter(&loaded_image_info, &systab, entry); 213 214 exit: 215 /* image has returned, loaded-image obj goes *poof*: */ 216 list_del(&loaded_image_info_obj.link); 217 218 return ret; 219 } 220 221 static int do_bootefi_bootmgr_exec(unsigned long fdt_addr) 222 { 223 struct efi_device_path *device_path, *file_path; 224 void *addr; 225 efi_status_t r; 226 227 /* Initialize and populate EFI object list */ 228 if (!efi_obj_list_initalized) 229 efi_init_obj_list(); 230 231 /* 232 * gd lives in a fixed register which may get clobbered while we execute 233 * the payload. So save it here and restore it on every callback entry 234 */ 235 efi_save_gd(); 236 237 addr = efi_bootmgr_load(&device_path, &file_path); 238 if (!addr) 239 return 1; 240 241 printf("## Starting EFI application at %p ...\n", addr); 242 r = do_bootefi_exec(addr, (void *)fdt_addr, device_path, file_path); 243 printf("## Application terminated, r = %lu\n", 244 r & ~EFI_ERROR_MASK); 245 246 if (r != EFI_SUCCESS) 247 return 1; 248 249 return 0; 250 } 251 252 /* Interpreter command to boot an arbitrary EFI image from memory */ 253 static int do_bootefi(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) 254 { 255 char *saddr, *sfdt; 256 unsigned long addr, fdt_addr = 0; 257 unsigned long r; 258 259 if (argc < 2) 260 return CMD_RET_USAGE; 261 #ifdef CONFIG_CMD_BOOTEFI_HELLO 262 if (!strcmp(argv[1], "hello")) { 263 ulong size = __efi_helloworld_end - __efi_helloworld_begin; 264 265 saddr = env_get("loadaddr"); 266 if (saddr) 267 addr = simple_strtoul(saddr, NULL, 16); 268 else 269 addr = CONFIG_SYS_LOAD_ADDR; 270 memcpy((char *)addr, __efi_helloworld_begin, size); 271 } else 272 #endif 273 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST 274 if (!strcmp(argv[1], "selftest")) { 275 struct efi_loaded_image loaded_image_info = {}; 276 struct efi_object loaded_image_info_obj = {}; 277 278 efi_setup_loaded_image(&loaded_image_info, 279 &loaded_image_info_obj, 280 bootefi_device_path, bootefi_image_path); 281 /* 282 * gd lives in a fixed register which may get clobbered while we 283 * execute the payload. So save it here and restore it on every 284 * callback entry 285 */ 286 efi_save_gd(); 287 /* Initialize and populate EFI object list */ 288 if (!efi_obj_list_initalized) 289 efi_init_obj_list(); 290 return efi_selftest(&loaded_image_info, &systab); 291 } else 292 #endif 293 if (!strcmp(argv[1], "bootmgr")) { 294 unsigned long fdt_addr = 0; 295 296 if (argc > 2) 297 fdt_addr = simple_strtoul(argv[2], NULL, 16); 298 299 return do_bootefi_bootmgr_exec(fdt_addr); 300 } else { 301 saddr = argv[1]; 302 303 addr = simple_strtoul(saddr, NULL, 16); 304 305 if (argc > 2) { 306 sfdt = argv[2]; 307 fdt_addr = simple_strtoul(sfdt, NULL, 16); 308 } 309 } 310 311 printf("## Starting EFI application at %08lx ...\n", addr); 312 r = do_bootefi_exec((void *)addr, (void *)fdt_addr, 313 bootefi_device_path, bootefi_image_path); 314 printf("## Application terminated, r = %lu\n", 315 r & ~EFI_ERROR_MASK); 316 317 if (r != EFI_SUCCESS) 318 return 1; 319 else 320 return 0; 321 } 322 323 #ifdef CONFIG_SYS_LONGHELP 324 static char bootefi_help_text[] = 325 "<image address> [fdt address]\n" 326 " - boot EFI payload stored at address <image address>.\n" 327 " If specified, the device tree located at <fdt address> gets\n" 328 " exposed as EFI configuration table.\n" 329 #ifdef CONFIG_CMD_BOOTEFI_HELLO 330 "bootefi hello\n" 331 " - boot a sample Hello World application stored within U-Boot\n" 332 #endif 333 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST 334 "bootefi selftest\n" 335 " - boot an EFI selftest application stored within U-Boot\n" 336 #endif 337 "bootmgr [fdt addr]\n" 338 " - load and boot EFI payload based on BootOrder/BootXXXX variables.\n" 339 "\n" 340 " If specified, the device tree located at <fdt address> gets\n" 341 " exposed as EFI configuration table.\n"; 342 #endif 343 344 U_BOOT_CMD( 345 bootefi, 3, 0, do_bootefi, 346 "Boots an EFI payload from memory", 347 bootefi_help_text 348 ); 349 350 static int parse_partnum(const char *devnr) 351 { 352 const char *str = strchr(devnr, ':'); 353 if (str) { 354 str++; 355 return simple_strtoul(str, NULL, 16); 356 } 357 return 0; 358 } 359 360 void efi_set_bootdev(const char *dev, const char *devnr, const char *path) 361 { 362 char filename[32] = { 0 }; /* dp->str is u16[32] long */ 363 char *s; 364 365 if (strcmp(dev, "Net")) { 366 struct blk_desc *desc; 367 int part; 368 369 desc = blk_get_dev(dev, simple_strtol(devnr, NULL, 10)); 370 part = parse_partnum(devnr); 371 372 bootefi_device_path = efi_dp_from_part(desc, part); 373 } else { 374 #ifdef CONFIG_NET 375 bootefi_device_path = efi_dp_from_eth(); 376 #endif 377 } 378 379 if (!path) 380 return; 381 382 if (strcmp(dev, "Net")) { 383 /* Add leading / to fs paths, because they're absolute */ 384 snprintf(filename, sizeof(filename), "/%s", path); 385 } else { 386 snprintf(filename, sizeof(filename), "%s", path); 387 } 388 /* DOS style file path: */ 389 s = filename; 390 while ((s = strchr(s, '/'))) 391 *s++ = '\\'; 392 bootefi_image_path = efi_dp_from_file(NULL, 0, filename); 393 } 394