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 /* 24 * When booting using the "bootefi" command, we don't know which 25 * physical device the file came from. So we create a pseudo-device 26 * called "bootefi" with the device path /bootefi. 27 * 28 * In addition to the originating device we also declare the file path 29 * of "bootefi" based loads to be /bootefi. 30 */ 31 static struct efi_device_path_file_path bootefi_image_path[] = { 32 { 33 .dp.type = DEVICE_PATH_TYPE_MEDIA_DEVICE, 34 .dp.sub_type = DEVICE_PATH_SUB_TYPE_FILE_PATH, 35 .dp.length = sizeof(bootefi_image_path[0]), 36 .str = { 'b','o','o','t','e','f','i' }, 37 }, { 38 .dp.type = DEVICE_PATH_TYPE_END, 39 .dp.sub_type = DEVICE_PATH_SUB_TYPE_END, 40 .dp.length = sizeof(bootefi_image_path[0]), 41 } 42 }; 43 44 static struct efi_device_path_file_path bootefi_device_path[] = { 45 { 46 .dp.type = DEVICE_PATH_TYPE_MEDIA_DEVICE, 47 .dp.sub_type = DEVICE_PATH_SUB_TYPE_FILE_PATH, 48 .dp.length = sizeof(bootefi_image_path[0]), 49 .str = { 'b','o','o','t','e','f','i' }, 50 }, { 51 .dp.type = DEVICE_PATH_TYPE_END, 52 .dp.sub_type = DEVICE_PATH_SUB_TYPE_END, 53 .dp.length = sizeof(bootefi_image_path[0]), 54 } 55 }; 56 57 /* The EFI loaded_image interface for the image executed via "bootefi" */ 58 static struct efi_loaded_image loaded_image_info = { 59 .device_handle = bootefi_device_path, 60 .file_path = bootefi_image_path, 61 }; 62 63 /* The EFI object struct for the image executed via "bootefi" */ 64 static struct efi_object loaded_image_info_obj = { 65 .handle = &loaded_image_info, 66 .protocols = { 67 { 68 /* 69 * When asking for the loaded_image interface, just 70 * return handle which points to loaded_image_info 71 */ 72 .guid = &efi_guid_loaded_image, 73 .protocol_interface = &loaded_image_info, 74 }, 75 { 76 /* 77 * When asking for the device path interface, return 78 * bootefi_device_path 79 */ 80 .guid = &efi_guid_device_path, 81 .protocol_interface = bootefi_device_path, 82 }, 83 { 84 .guid = &efi_guid_console_control, 85 .protocol_interface = (void *) &efi_console_control 86 }, 87 }, 88 }; 89 90 /* The EFI object struct for the device the "bootefi" image was loaded from */ 91 static struct efi_object bootefi_device_obj = { 92 .handle = bootefi_device_path, 93 .protocols = { 94 { 95 /* When asking for the device path interface, return 96 * bootefi_device_path */ 97 .guid = &efi_guid_device_path, 98 .protocol_interface = bootefi_device_path 99 } 100 }, 101 }; 102 103 static void *copy_fdt(void *fdt) 104 { 105 u64 fdt_size = fdt_totalsize(fdt); 106 unsigned long fdt_ram_start = -1L, fdt_pages; 107 u64 new_fdt_addr; 108 void *new_fdt; 109 int i; 110 111 for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) { 112 u64 ram_start = gd->bd->bi_dram[i].start; 113 u64 ram_size = gd->bd->bi_dram[i].size; 114 115 if (!ram_size) 116 continue; 117 118 if (ram_start < fdt_ram_start) 119 fdt_ram_start = ram_start; 120 } 121 122 /* Give us at least 4kb breathing room */ 123 fdt_size = ALIGN(fdt_size + 4096, 4096); 124 fdt_pages = fdt_size >> EFI_PAGE_SHIFT; 125 126 /* Safe fdt location is at 128MB */ 127 new_fdt_addr = fdt_ram_start + (128 * 1024 * 1024) + fdt_size; 128 if (efi_allocate_pages(1, EFI_BOOT_SERVICES_DATA, fdt_pages, 129 &new_fdt_addr) != EFI_SUCCESS) { 130 /* If we can't put it there, put it somewhere */ 131 new_fdt_addr = (ulong)memalign(4096, fdt_size); 132 if (efi_allocate_pages(1, EFI_BOOT_SERVICES_DATA, fdt_pages, 133 &new_fdt_addr) != EFI_SUCCESS) { 134 printf("ERROR: Failed to reserve space for FDT\n"); 135 return NULL; 136 } 137 } 138 139 new_fdt = (void*)(ulong)new_fdt_addr; 140 memcpy(new_fdt, fdt, fdt_totalsize(fdt)); 141 fdt_set_totalsize(new_fdt, fdt_size); 142 143 return new_fdt; 144 } 145 146 #ifdef CONFIG_ARM64 147 static unsigned long efi_run_in_el2(ulong (*entry)(void *image_handle, 148 struct efi_system_table *st), void *image_handle, 149 struct efi_system_table *st) 150 { 151 /* Enable caches again */ 152 dcache_enable(); 153 154 return entry(image_handle, st); 155 } 156 #endif 157 158 /* 159 * Load an EFI payload into a newly allocated piece of memory, register all 160 * EFI objects it would want to access and jump to it. 161 */ 162 static unsigned long do_bootefi_exec(void *efi, void *fdt) 163 { 164 ulong (*entry)(void *image_handle, struct efi_system_table *st) 165 asmlinkage; 166 ulong fdt_pages, fdt_size, fdt_start, fdt_end; 167 bootm_headers_t img = { 0 }; 168 169 /* 170 * gd lives in a fixed register which may get clobbered while we execute 171 * the payload. So save it here and restore it on every callback entry 172 */ 173 efi_save_gd(); 174 175 if (fdt && !fdt_check_header(fdt)) { 176 /* Prepare fdt for payload */ 177 fdt = copy_fdt(fdt); 178 179 if (image_setup_libfdt(&img, fdt, 0, NULL)) { 180 printf("ERROR: Failed to process device tree\n"); 181 return -EINVAL; 182 } 183 184 /* Link to it in the efi tables */ 185 systab.tables[0].guid = EFI_FDT_GUID; 186 systab.tables[0].table = fdt; 187 systab.nr_tables = 1; 188 189 /* And reserve the space in the memory map */ 190 fdt_start = ((ulong)fdt) & ~EFI_PAGE_MASK; 191 fdt_end = ((ulong)fdt) + fdt_totalsize(fdt); 192 fdt_size = (fdt_end - fdt_start) + EFI_PAGE_MASK; 193 fdt_pages = fdt_size >> EFI_PAGE_SHIFT; 194 /* Give a bootloader the chance to modify the device tree */ 195 fdt_pages += 2; 196 efi_add_memory_map(fdt_start, fdt_pages, 197 EFI_BOOT_SERVICES_DATA, true); 198 } else { 199 printf("WARNING: Invalid device tree, expect boot to fail\n"); 200 systab.nr_tables = 0; 201 } 202 203 /* Load the EFI payload */ 204 entry = efi_load_pe(efi, &loaded_image_info); 205 if (!entry) 206 return -ENOENT; 207 208 /* Initialize and populate EFI object list */ 209 INIT_LIST_HEAD(&efi_obj_list); 210 list_add_tail(&loaded_image_info_obj.link, &efi_obj_list); 211 list_add_tail(&bootefi_device_obj.link, &efi_obj_list); 212 #ifdef CONFIG_PARTITIONS 213 efi_disk_register(); 214 #endif 215 #ifdef CONFIG_LCD 216 efi_gop_register(); 217 #endif 218 #ifdef CONFIG_NET 219 void *nethandle = loaded_image_info.device_handle; 220 efi_net_register(&nethandle); 221 222 if (!memcmp(bootefi_device_path[0].str, "N\0e\0t", 6)) 223 loaded_image_info.device_handle = nethandle; 224 else 225 loaded_image_info.device_handle = bootefi_device_path; 226 #endif 227 #ifdef CONFIG_GENERATE_SMBIOS_TABLE 228 efi_smbios_register(); 229 #endif 230 231 /* Initialize EFI runtime services */ 232 efi_reset_system_init(); 233 efi_get_time_init(); 234 235 /* Call our payload! */ 236 debug("%s:%d Jumping to 0x%lx\n", __func__, __LINE__, (long)entry); 237 238 if (setjmp(&loaded_image_info.exit_jmp)) { 239 efi_status_t status = loaded_image_info.exit_status; 240 return status == EFI_SUCCESS ? 0 : -EINVAL; 241 } 242 243 #ifdef CONFIG_ARM64 244 /* On AArch64 we need to make sure we call our payload in < EL3 */ 245 if (current_el() == 3) { 246 smp_kick_all_cpus(); 247 dcache_disable(); /* flush cache before switch to EL2 */ 248 249 /* Move into EL2 and keep running there */ 250 armv8_switch_to_el2((ulong)entry, (ulong)&loaded_image_info, 251 (ulong)&systab, 0, (ulong)efi_run_in_el2, 252 ES_TO_AARCH64); 253 254 /* Should never reach here, efi exits with longjmp */ 255 while (1) { } 256 } 257 #endif 258 259 return entry(&loaded_image_info, &systab); 260 } 261 262 263 /* Interpreter command to boot an arbitrary EFI image from memory */ 264 static int do_bootefi(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) 265 { 266 char *saddr, *sfdt; 267 unsigned long addr, fdt_addr = 0; 268 int r = 0; 269 270 if (argc < 2) 271 return CMD_RET_USAGE; 272 #ifdef CONFIG_CMD_BOOTEFI_HELLO 273 if (!strcmp(argv[1], "hello")) { 274 ulong size = __efi_hello_world_end - __efi_hello_world_begin; 275 276 addr = CONFIG_SYS_LOAD_ADDR; 277 memcpy((char *)addr, __efi_hello_world_begin, size); 278 } else 279 #endif 280 { 281 saddr = argv[1]; 282 283 addr = simple_strtoul(saddr, NULL, 16); 284 285 if (argc > 2) { 286 sfdt = argv[2]; 287 fdt_addr = simple_strtoul(sfdt, NULL, 16); 288 } 289 } 290 291 printf("## Starting EFI application at %08lx ...\n", addr); 292 r = do_bootefi_exec((void *)addr, (void*)fdt_addr); 293 printf("## Application terminated, r = %d\n", r); 294 295 if (r != 0) 296 r = 1; 297 298 return r; 299 } 300 301 #ifdef CONFIG_SYS_LONGHELP 302 static char bootefi_help_text[] = 303 "<image address> [fdt address]\n" 304 " - boot EFI payload stored at address <image address>.\n" 305 " If specified, the device tree located at <fdt address> gets\n" 306 " exposed as EFI configuration table.\n" 307 #ifdef CONFIG_CMD_BOOTEFI_HELLO 308 "hello\n" 309 " - boot a sample Hello World application stored within U-Boot" 310 #endif 311 ; 312 #endif 313 314 U_BOOT_CMD( 315 bootefi, 3, 0, do_bootefi, 316 "Boots an EFI payload from memory", 317 bootefi_help_text 318 ); 319 320 void efi_set_bootdev(const char *dev, const char *devnr, const char *path) 321 { 322 __maybe_unused struct blk_desc *desc; 323 char devname[32] = { 0 }; /* dp->str is u16[32] long */ 324 char *colon; 325 326 #if defined(CONFIG_BLK) || CONFIG_IS_ENABLED(ISO_PARTITION) 327 desc = blk_get_dev(dev, simple_strtol(devnr, NULL, 10)); 328 #endif 329 330 #ifdef CONFIG_BLK 331 if (desc) { 332 snprintf(devname, sizeof(devname), "%s", desc->bdev->name); 333 } else 334 #endif 335 336 { 337 /* Assemble the condensed device name we use in efi_disk.c */ 338 snprintf(devname, sizeof(devname), "%s%s", dev, devnr); 339 } 340 341 colon = strchr(devname, ':'); 342 343 #if CONFIG_IS_ENABLED(ISO_PARTITION) 344 /* For ISOs we create partition block devices */ 345 if (desc && (desc->type != DEV_TYPE_UNKNOWN) && 346 (desc->part_type == PART_TYPE_ISO)) { 347 if (!colon) 348 snprintf(devname, sizeof(devname), "%s:1", devname); 349 350 colon = NULL; 351 } 352 #endif 353 354 if (colon) 355 *colon = '\0'; 356 357 /* Patch bootefi_device_path to the target device */ 358 memset(bootefi_device_path[0].str, 0, sizeof(bootefi_device_path[0].str)); 359 ascii2unicode(bootefi_device_path[0].str, devname); 360 361 /* Patch bootefi_image_path to the target file path */ 362 memset(bootefi_image_path[0].str, 0, sizeof(bootefi_image_path[0].str)); 363 if (strcmp(dev, "Net")) { 364 /* Add leading / to fs paths, because they're absolute */ 365 snprintf(devname, sizeof(devname), "/%s", path); 366 } else { 367 snprintf(devname, sizeof(devname), "%s", path); 368 } 369 ascii2unicode(bootefi_image_path[0].str, devname); 370 } 371