1 // SPDX-License-Identifier: GPL-2.0+
3 * EFI application loader
5 * Copyright (c) 2016 Alexander Graf
12 #include <efi_loader.h>
13 #include <efi_selftest.h>
15 #include <linux/libfdt.h>
16 #include <linux/libfdt_env.h>
18 #include <asm/global_data.h>
19 #include <asm-generic/sections.h>
20 #include <asm-generic/unaligned.h>
21 #include <linux/linkage.h>
23 #ifdef CONFIG_ARMV7_NONSEC
24 #include <asm/armv7.h>
25 #include <asm/secure.h>
28 DECLARE_GLOBAL_DATA_PTR;
30 #define OBJ_LIST_NOT_INITIALIZED 1
32 static efi_status_t efi_obj_list_initialized = OBJ_LIST_NOT_INITIALIZED;
34 static struct efi_device_path *bootefi_image_path;
35 static struct efi_device_path *bootefi_device_path;
37 /* Initialize and populate EFI object list */
38 efi_status_t efi_init_obj_list(void)
40 efi_status_t ret = EFI_SUCCESS;
42 /* Initialize once only */
43 if (efi_obj_list_initialized != OBJ_LIST_NOT_INITIALIZED)
44 return efi_obj_list_initialized;
46 /* Initialize EFI driver uclass */
47 ret = efi_driver_init();
48 if (ret != EFI_SUCCESS)
51 ret = efi_console_register();
52 if (ret != EFI_SUCCESS)
54 #ifdef CONFIG_PARTITIONS
55 ret = efi_disk_register();
56 if (ret != EFI_SUCCESS)
59 #if defined(CONFIG_LCD) || defined(CONFIG_DM_VIDEO)
60 ret = efi_gop_register();
61 if (ret != EFI_SUCCESS)
65 ret = efi_net_register();
66 if (ret != EFI_SUCCESS)
69 #ifdef CONFIG_GENERATE_ACPI_TABLE
70 ret = efi_acpi_register();
71 if (ret != EFI_SUCCESS)
74 #ifdef CONFIG_GENERATE_SMBIOS_TABLE
75 ret = efi_smbios_register();
76 if (ret != EFI_SUCCESS)
79 ret = efi_watchdog_register();
80 if (ret != EFI_SUCCESS)
83 /* Initialize EFI runtime services */
84 ret = efi_reset_system_init();
85 if (ret != EFI_SUCCESS)
87 ret = efi_get_time_init();
88 if (ret != EFI_SUCCESS)
92 efi_obj_list_initialized = ret;
97 * Allow unaligned memory access.
99 * This routine is overridden by architectures providing this feature.
101 void __weak allow_unaligned(void)
106 * Set the load options of an image from an environment variable.
108 * @loaded_image_info: the image
109 * @env_var: name of the environment variable
111 static void set_load_options(struct efi_loaded_image *loaded_image_info,
115 const char *env = env_get(env_var);
117 loaded_image_info->load_options = NULL;
118 loaded_image_info->load_options_size = 0;
121 size = strlen(env) + 1;
122 loaded_image_info->load_options = calloc(size, sizeof(u16));
123 if (!loaded_image_info->load_options) {
124 printf("ERROR: Out of memory\n");
127 utf8_to_utf16(loaded_image_info->load_options, (u8 *)env, size);
128 loaded_image_info->load_options_size = size * 2;
131 static void *copy_fdt(void *fdt)
133 u64 fdt_size = fdt_totalsize(fdt);
134 unsigned long fdt_ram_start = -1L, fdt_pages;
139 for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
140 u64 ram_start = gd->bd->bi_dram[i].start;
141 u64 ram_size = gd->bd->bi_dram[i].size;
146 if (ram_start < fdt_ram_start)
147 fdt_ram_start = ram_start;
150 /* Give us at least 4kb breathing room */
151 fdt_size = ALIGN(fdt_size + 4096, EFI_PAGE_SIZE);
152 fdt_pages = fdt_size >> EFI_PAGE_SHIFT;
154 /* Safe fdt location is at 128MB */
155 new_fdt_addr = fdt_ram_start + (128 * 1024 * 1024) + fdt_size;
156 if (efi_allocate_pages(EFI_ALLOCATE_MAX_ADDRESS,
157 EFI_RUNTIME_SERVICES_DATA, fdt_pages,
158 &new_fdt_addr) != EFI_SUCCESS) {
159 /* If we can't put it there, put it somewhere */
160 new_fdt_addr = (ulong)memalign(EFI_PAGE_SIZE, fdt_size);
161 if (efi_allocate_pages(EFI_ALLOCATE_MAX_ADDRESS,
162 EFI_RUNTIME_SERVICES_DATA, fdt_pages,
163 &new_fdt_addr) != EFI_SUCCESS) {
164 printf("ERROR: Failed to reserve space for FDT\n");
169 new_fdt = (void*)(ulong)new_fdt_addr;
170 memcpy(new_fdt, fdt, fdt_totalsize(fdt));
171 fdt_set_totalsize(new_fdt, fdt_size);
176 static efi_status_t efi_do_enter(
177 efi_handle_t image_handle, struct efi_system_table *st,
178 EFIAPI efi_status_t (*entry)(
179 efi_handle_t image_handle,
180 struct efi_system_table *st))
182 efi_status_t ret = EFI_LOAD_ERROR;
185 ret = entry(image_handle, st);
186 st->boottime->exit(image_handle, ret, 0, NULL);
191 static efi_status_t efi_run_in_el2(EFIAPI efi_status_t (*entry)(
192 efi_handle_t image_handle, struct efi_system_table *st),
193 efi_handle_t image_handle, struct efi_system_table *st)
195 /* Enable caches again */
198 return efi_do_enter(image_handle, st, entry);
202 #ifdef CONFIG_ARMV7_NONSEC
203 static efi_status_t efi_run_in_hyp(EFIAPI efi_status_t (*entry)(
204 efi_handle_t image_handle, struct efi_system_table *st),
205 efi_handle_t image_handle, struct efi_system_table *st)
207 /* Enable caches again */
210 return efi_do_enter(image_handle, st, entry);
214 /* Carve out DT reserved memory ranges */
215 static efi_status_t efi_carve_out_dt_rsv(void *fdt)
218 uint64_t addr, size, pages;
220 nr_rsv = fdt_num_mem_rsv(fdt);
222 /* Look for an existing entry and add it to the efi mem map. */
223 for (i = 0; i < nr_rsv; i++) {
224 if (fdt_get_mem_rsv(fdt, i, &addr, &size) != 0)
227 pages = ALIGN(size, EFI_PAGE_SIZE) >> EFI_PAGE_SHIFT;
228 efi_add_memory_map(addr, pages, EFI_RESERVED_MEMORY_TYPE,
235 static efi_status_t efi_install_fdt(void *fdt)
237 bootm_headers_t img = { 0 };
238 ulong fdt_pages, fdt_size, fdt_start, fdt_end;
241 if (fdt_check_header(fdt)) {
242 printf("ERROR: invalid device tree\n");
243 return EFI_INVALID_PARAMETER;
246 /* Prepare fdt for payload */
249 return EFI_OUT_OF_RESOURCES;
251 if (image_setup_libfdt(&img, fdt, 0, NULL)) {
252 printf("ERROR: failed to process device tree\n");
253 return EFI_LOAD_ERROR;
256 if (efi_carve_out_dt_rsv(fdt) != EFI_SUCCESS) {
257 printf("ERROR: failed to carve out memory\n");
258 return EFI_LOAD_ERROR;
261 /* Link to it in the efi tables */
262 ret = efi_install_configuration_table(&efi_guid_fdt, fdt);
263 if (ret != EFI_SUCCESS)
264 return EFI_OUT_OF_RESOURCES;
266 /* And reserve the space in the memory map */
267 fdt_start = ((ulong)fdt) & ~EFI_PAGE_MASK;
268 fdt_end = ((ulong)fdt) + fdt_totalsize(fdt);
269 fdt_size = (fdt_end - fdt_start) + EFI_PAGE_MASK;
270 fdt_pages = fdt_size >> EFI_PAGE_SHIFT;
271 /* Give a bootloader the chance to modify the device tree */
273 ret = efi_add_memory_map(fdt_start, fdt_pages,
274 EFI_BOOT_SERVICES_DATA, true);
279 * Load an EFI payload into a newly allocated piece of memory, register all
280 * EFI objects it would want to access and jump to it.
282 static efi_status_t do_bootefi_exec(void *efi,
283 struct efi_device_path *device_path,
284 struct efi_device_path *image_path)
286 struct efi_loaded_image loaded_image_info = {};
287 struct efi_object loaded_image_info_obj = {};
288 struct efi_object mem_obj = {};
289 struct efi_device_path *memdp = NULL;
292 EFIAPI efi_status_t (*entry)(efi_handle_t image_handle,
293 struct efi_system_table *st);
296 * Special case for efi payload not loaded from disk, such as
297 * 'bootefi hello' or for example payload loaded directly into
298 * memory via jtag/etc:
300 if (!device_path && !image_path) {
301 printf("WARNING: using memory device/image path, this may confuse some payloads!\n");
302 /* actual addresses filled in after efi_load_pe() */
303 memdp = efi_dp_from_mem(0, 0, 0);
304 device_path = image_path = memdp;
305 efi_add_handle(&mem_obj);
307 ret = efi_add_protocol(mem_obj.handle, &efi_guid_device_path,
309 if (ret != EFI_SUCCESS)
312 assert(device_path && image_path);
315 efi_setup_loaded_image(&loaded_image_info, &loaded_image_info_obj,
316 device_path, image_path);
319 * gd lives in a fixed register which may get clobbered while we execute
320 * the payload. So save it here and restore it on every callback entry
324 /* Transfer environment variable bootargs as load options */
325 set_load_options(&loaded_image_info, "bootargs");
326 /* Load the EFI payload */
327 entry = efi_load_pe(efi, &loaded_image_info);
329 ret = EFI_LOAD_ERROR;
334 struct efi_device_path_memory *mdp = (void *)memdp;
335 mdp->memory_type = loaded_image_info.image_code_type;
336 mdp->start_address = (uintptr_t)loaded_image_info.image_base;
337 mdp->end_address = mdp->start_address +
338 loaded_image_info.image_size;
341 /* we don't support much: */
342 env_set("efi_8be4df61-93ca-11d2-aa0d-00e098032b8c_OsIndicationsSupported",
343 "{ro,boot}(blob)0000000000000000");
345 /* Call our payload! */
346 debug("%s:%d Jumping to 0x%lx\n", __func__, __LINE__, (long)entry);
348 if (setjmp(&loaded_image_info.exit_jmp)) {
349 ret = loaded_image_info.exit_status;
354 /* On AArch64 we need to make sure we call our payload in < EL3 */
355 if (current_el() == 3) {
357 dcache_disable(); /* flush cache before switch to EL2 */
359 /* Move into EL2 and keep running there */
360 armv8_switch_to_el2((ulong)entry,
361 (ulong)&loaded_image_info_obj.handle,
362 (ulong)&systab, 0, (ulong)efi_run_in_el2,
365 /* Should never reach here, efi exits with longjmp */
370 #ifdef CONFIG_ARMV7_NONSEC
371 if (armv7_boot_nonsec()) {
372 dcache_disable(); /* flush cache before switch to HYP */
375 secure_ram_addr(_do_nonsec_entry)(
378 (uintptr_t)loaded_image_info_obj.handle,
381 /* Should never reach here, efi exits with longjmp */
386 ret = efi_do_enter(loaded_image_info_obj.handle, &systab, entry);
389 /* image has returned, loaded-image obj goes *poof*: */
390 list_del(&loaded_image_info_obj.link);
392 list_del(&mem_obj.link);
397 static int do_bootefi_bootmgr_exec(void)
399 struct efi_device_path *device_path, *file_path;
404 * gd lives in a fixed register which may get clobbered while we execute
405 * the payload. So save it here and restore it on every callback entry
409 addr = efi_bootmgr_load(&device_path, &file_path);
413 printf("## Starting EFI application at %p ...\n", addr);
414 r = do_bootefi_exec(addr, device_path, file_path);
415 printf("## Application terminated, r = %lu\n",
416 r & ~EFI_ERROR_MASK);
418 if (r != EFI_SUCCESS)
424 /* Interpreter command to boot an arbitrary EFI image from memory */
425 static int do_bootefi(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
432 /* Allow unaligned memory access */
435 /* Initialize EFI drivers */
436 r = efi_init_obj_list();
437 if (r != EFI_SUCCESS) {
438 printf("Error: Cannot set up EFI drivers, r = %lu\n",
439 r & ~EFI_ERROR_MASK);
440 return CMD_RET_FAILURE;
444 return CMD_RET_USAGE;
447 fdt_addr = (void *)simple_strtoul(argv[2], NULL, 16);
448 if (!fdt_addr && *argv[2] != '0')
449 return CMD_RET_USAGE;
450 /* Install device tree */
451 r = efi_install_fdt(fdt_addr);
452 if (r != EFI_SUCCESS) {
453 printf("ERROR: failed to install device tree\n");
454 return CMD_RET_FAILURE;
457 /* Remove device tree. EFI_NOT_FOUND can be ignored here */
458 efi_install_configuration_table(&efi_guid_fdt, NULL);
459 printf("WARNING: booting without device tree\n");
461 #ifdef CONFIG_CMD_BOOTEFI_HELLO
462 if (!strcmp(argv[1], "hello")) {
463 ulong size = __efi_helloworld_end - __efi_helloworld_begin;
465 saddr = env_get("loadaddr");
467 addr = simple_strtoul(saddr, NULL, 16);
469 addr = CONFIG_SYS_LOAD_ADDR;
470 memcpy((char *)addr, __efi_helloworld_begin, size);
473 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
474 if (!strcmp(argv[1], "selftest")) {
475 struct efi_loaded_image loaded_image_info = {};
476 struct efi_object loaded_image_info_obj = {};
478 /* Construct a dummy device path. */
479 bootefi_device_path = efi_dp_from_mem(EFI_RESERVED_MEMORY_TYPE,
480 (uintptr_t)&efi_selftest,
481 (uintptr_t)&efi_selftest);
482 bootefi_image_path = efi_dp_from_file(NULL, 0, "\\selftest");
484 efi_setup_loaded_image(&loaded_image_info,
485 &loaded_image_info_obj,
486 bootefi_device_path, bootefi_image_path);
488 * gd lives in a fixed register which may get clobbered while we
489 * execute the payload. So save it here and restore it on every
493 /* Transfer environment variable efi_selftest as load options */
494 set_load_options(&loaded_image_info, "efi_selftest");
495 /* Execute the test */
496 r = efi_selftest(loaded_image_info_obj.handle, &systab);
498 free(loaded_image_info.load_options);
499 list_del(&loaded_image_info_obj.link);
500 return r != EFI_SUCCESS;
503 if (!strcmp(argv[1], "bootmgr")) {
504 return do_bootefi_bootmgr_exec();
508 addr = simple_strtoul(saddr, NULL, 16);
509 /* Check that a numeric value was passed */
510 if (!addr && *saddr != '0')
511 return CMD_RET_USAGE;
515 printf("## Starting EFI application at %08lx ...\n", addr);
516 r = do_bootefi_exec((void *)addr, bootefi_device_path,
518 printf("## Application terminated, r = %lu\n",
519 r & ~EFI_ERROR_MASK);
521 if (r != EFI_SUCCESS)
527 #ifdef CONFIG_SYS_LONGHELP
528 static char bootefi_help_text[] =
529 "<image address> [fdt address]\n"
530 " - boot EFI payload stored at address <image address>.\n"
531 " If specified, the device tree located at <fdt address> gets\n"
532 " exposed as EFI configuration table.\n"
533 #ifdef CONFIG_CMD_BOOTEFI_HELLO
535 " - boot a sample Hello World application stored within U-Boot\n"
537 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
538 "bootefi selftest [fdt address]\n"
539 " - boot an EFI selftest application stored within U-Boot\n"
540 " Use environment variable efi_selftest to select a single test.\n"
541 " Use 'setenv efi_selftest list' to enumerate all tests.\n"
543 "bootefi bootmgr [fdt addr]\n"
544 " - load and boot EFI payload based on BootOrder/BootXXXX variables.\n"
546 " If specified, the device tree located at <fdt address> gets\n"
547 " exposed as EFI configuration table.\n";
551 bootefi, 3, 0, do_bootefi,
552 "Boots an EFI payload from memory",
556 void efi_set_bootdev(const char *dev, const char *devnr, const char *path)
558 char filename[32] = { 0 }; /* dp->str is u16[32] long */
561 if (strcmp(dev, "Net")) {
562 struct blk_desc *desc;
563 disk_partition_t fs_partition;
566 part = blk_get_device_part_str(dev, devnr, &desc, &fs_partition,
571 bootefi_device_path = efi_dp_from_part(desc, part);
574 bootefi_device_path = efi_dp_from_eth();
581 if (strcmp(dev, "Net")) {
582 /* Add leading / to fs paths, because they're absolute */
583 snprintf(filename, sizeof(filename), "/%s", path);
585 snprintf(filename, sizeof(filename), "%s", path);
587 /* DOS style file path: */
589 while ((s = strchr(s, '/')))
591 bootefi_image_path = efi_dp_from_file(NULL, 0, filename);