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>
19 #include <asm/global_data.h>
20 #include <asm-generic/sections.h>
21 #include <asm-generic/unaligned.h>
22 #include <linux/linkage.h>
24 #ifdef CONFIG_ARMV7_NONSEC
25 #include <asm/armv7.h>
26 #include <asm/secure.h>
29 DECLARE_GLOBAL_DATA_PTR
;
31 #define OBJ_LIST_NOT_INITIALIZED 1
33 static efi_status_t efi_obj_list_initialized
= OBJ_LIST_NOT_INITIALIZED
;
35 static struct efi_device_path
*bootefi_image_path
;
36 static struct efi_device_path
*bootefi_device_path
;
38 /* Initialize and populate EFI object list */
39 efi_status_t
efi_init_obj_list(void)
41 efi_status_t ret
= EFI_SUCCESS
;
43 /* Initialize once only */
44 if (efi_obj_list_initialized
!= OBJ_LIST_NOT_INITIALIZED
)
45 return efi_obj_list_initialized
;
47 /* Initialize system table */
48 ret
= efi_initialize_system_table();
49 if (ret
!= EFI_SUCCESS
)
52 /* Initialize EFI driver uclass */
53 ret
= efi_driver_init();
54 if (ret
!= EFI_SUCCESS
)
57 ret
= efi_console_register();
58 if (ret
!= EFI_SUCCESS
)
60 #ifdef CONFIG_PARTITIONS
61 ret
= efi_disk_register();
62 if (ret
!= EFI_SUCCESS
)
65 #if defined(CONFIG_LCD) || defined(CONFIG_DM_VIDEO)
66 ret
= efi_gop_register();
67 if (ret
!= EFI_SUCCESS
)
71 ret
= efi_net_register();
72 if (ret
!= EFI_SUCCESS
)
75 #ifdef CONFIG_GENERATE_ACPI_TABLE
76 ret
= efi_acpi_register();
77 if (ret
!= EFI_SUCCESS
)
80 #ifdef CONFIG_GENERATE_SMBIOS_TABLE
81 ret
= efi_smbios_register();
82 if (ret
!= EFI_SUCCESS
)
85 ret
= efi_watchdog_register();
86 if (ret
!= EFI_SUCCESS
)
89 /* Initialize EFI runtime services */
90 ret
= efi_reset_system_init();
91 if (ret
!= EFI_SUCCESS
)
95 efi_obj_list_initialized
= ret
;
100 * Allow unaligned memory access.
102 * This routine is overridden by architectures providing this feature.
104 void __weak
allow_unaligned(void)
109 * Set the load options of an image from an environment variable.
111 * @loaded_image_info: the image
112 * @env_var: name of the environment variable
114 static void set_load_options(struct efi_loaded_image
*loaded_image_info
,
118 const char *env
= env_get(env_var
);
121 loaded_image_info
->load_options
= NULL
;
122 loaded_image_info
->load_options_size
= 0;
125 size
= utf8_utf16_strlen(env
) + 1;
126 loaded_image_info
->load_options
= calloc(size
, sizeof(u16
));
127 if (!loaded_image_info
->load_options
) {
128 printf("ERROR: Out of memory\n");
131 pos
= loaded_image_info
->load_options
;
132 utf8_utf16_strcpy(&pos
, env
);
133 loaded_image_info
->load_options_size
= size
* 2;
137 * copy_fdt() - Copy the device tree to a new location available to EFI
139 * The FDT is relocated into a suitable location within the EFI memory map.
140 * An additional 12KB is added to the space in case the device tree needs to be
141 * expanded later with fdt_open_into().
143 * @fdt_addr: On entry, address of start of FDT. On exit, address of relocated
145 * @fdt_sizep: Returns new size of FDT, including
146 * @return new relocated address of FDT
148 static efi_status_t
copy_fdt(ulong
*fdt_addrp
, ulong
*fdt_sizep
)
150 unsigned long fdt_ram_start
= -1L, fdt_pages
;
151 efi_status_t ret
= 0;
157 for (i
= 0; i
< CONFIG_NR_DRAM_BANKS
; i
++) {
158 u64 ram_start
= gd
->bd
->bi_dram
[i
].start
;
159 u64 ram_size
= gd
->bd
->bi_dram
[i
].size
;
164 if (ram_start
< fdt_ram_start
)
165 fdt_ram_start
= ram_start
;
169 * Give us at least 4KB of breathing room in case the device tree needs
170 * to be expanded later. Round up to the nearest EFI page boundary.
172 fdt
= map_sysmem(*fdt_addrp
, 0);
173 fdt_size
= fdt_totalsize(fdt
);
174 fdt_size
+= 4096 * 3;
175 fdt_size
= ALIGN(fdt_size
+ EFI_PAGE_SIZE
- 1, EFI_PAGE_SIZE
);
176 fdt_pages
= fdt_size
>> EFI_PAGE_SHIFT
;
178 /* Safe fdt location is at 127MB */
179 new_fdt_addr
= fdt_ram_start
+ (127 * 1024 * 1024) + fdt_size
;
180 ret
= efi_allocate_pages(EFI_ALLOCATE_MAX_ADDRESS
,
181 EFI_RUNTIME_SERVICES_DATA
, fdt_pages
,
183 if (ret
!= EFI_SUCCESS
) {
184 /* If we can't put it there, put it somewhere */
185 new_fdt_addr
= (ulong
)memalign(EFI_PAGE_SIZE
, fdt_size
);
186 ret
= efi_allocate_pages(EFI_ALLOCATE_MAX_ADDRESS
,
187 EFI_RUNTIME_SERVICES_DATA
, fdt_pages
,
189 if (ret
!= EFI_SUCCESS
) {
190 printf("ERROR: Failed to reserve space for FDT\n");
195 new_fdt
= map_sysmem(new_fdt_addr
, fdt_size
);
196 memcpy(new_fdt
, fdt
, fdt_totalsize(fdt
));
197 fdt_set_totalsize(new_fdt
, fdt_size
);
199 *fdt_addrp
= new_fdt_addr
;
200 *fdt_sizep
= fdt_size
;
205 static efi_status_t
efi_do_enter(
206 efi_handle_t image_handle
, struct efi_system_table
*st
,
207 EFIAPI
efi_status_t (*entry
)(
208 efi_handle_t image_handle
,
209 struct efi_system_table
*st
))
211 efi_status_t ret
= EFI_LOAD_ERROR
;
214 ret
= entry(image_handle
, st
);
215 st
->boottime
->exit(image_handle
, ret
, 0, NULL
);
220 static efi_status_t
efi_run_in_el2(EFIAPI
efi_status_t (*entry
)(
221 efi_handle_t image_handle
, struct efi_system_table
*st
),
222 efi_handle_t image_handle
, struct efi_system_table
*st
)
224 /* Enable caches again */
227 return efi_do_enter(image_handle
, st
, entry
);
231 #ifdef CONFIG_ARMV7_NONSEC
232 static bool is_nonsec
;
234 static efi_status_t
efi_run_in_hyp(EFIAPI
efi_status_t (*entry
)(
235 efi_handle_t image_handle
, struct efi_system_table
*st
),
236 efi_handle_t image_handle
, struct efi_system_table
*st
)
238 /* Enable caches again */
243 return efi_do_enter(image_handle
, st
, entry
);
248 * efi_carve_out_dt_rsv() - Carve out DT reserved memory ranges
250 * The mem_rsv entries of the FDT are added to the memory map. Any failures are
251 * ignored because this is not critical and we would rather continue to try to
254 * @fdt: Pointer to device tree
256 static void efi_carve_out_dt_rsv(void *fdt
)
259 uint64_t addr
, size
, pages
;
261 nr_rsv
= fdt_num_mem_rsv(fdt
);
263 /* Look for an existing entry and add it to the efi mem map. */
264 for (i
= 0; i
< nr_rsv
; i
++) {
265 if (fdt_get_mem_rsv(fdt
, i
, &addr
, &size
) != 0)
268 pages
= ALIGN(size
, EFI_PAGE_SIZE
) >> EFI_PAGE_SHIFT
;
269 if (!efi_add_memory_map(addr
, pages
, EFI_RESERVED_MEMORY_TYPE
,
271 printf("FDT memrsv map %d: Failed to add to map\n", i
);
275 static efi_status_t
efi_install_fdt(ulong fdt_addr
)
277 bootm_headers_t img
= { 0 };
278 ulong fdt_pages
, fdt_size
, fdt_start
;
282 fdt
= map_sysmem(fdt_addr
, 0);
283 if (fdt_check_header(fdt
)) {
284 printf("ERROR: invalid device tree\n");
285 return EFI_INVALID_PARAMETER
;
288 /* Prepare fdt for payload */
289 ret
= copy_fdt(&fdt_addr
, &fdt_size
);
294 fdt
= map_sysmem(fdt_addr
, 0);
295 fdt_size
= fdt_totalsize(fdt
);
296 if (image_setup_libfdt(&img
, fdt
, 0, NULL
)) {
297 printf("ERROR: failed to process device tree\n");
298 return EFI_LOAD_ERROR
;
301 efi_carve_out_dt_rsv(fdt
);
303 /* Link to it in the efi tables */
304 ret
= efi_install_configuration_table(&efi_guid_fdt
, fdt
);
305 if (ret
!= EFI_SUCCESS
)
306 return EFI_OUT_OF_RESOURCES
;
308 /* And reserve the space in the memory map */
309 fdt_start
= fdt_addr
;
310 fdt_pages
= fdt_size
>> EFI_PAGE_SHIFT
;
312 ret
= efi_add_memory_map(fdt_start
, fdt_pages
,
313 EFI_BOOT_SERVICES_DATA
, true);
319 * Load an EFI payload into a newly allocated piece of memory, register all
320 * EFI objects it would want to access and jump to it.
322 static efi_status_t
do_bootefi_exec(void *efi
,
323 struct efi_device_path
*device_path
,
324 struct efi_device_path
*image_path
)
326 struct efi_loaded_image loaded_image_info
= {};
327 struct efi_object loaded_image_info_obj
= {};
328 struct efi_object mem_obj
= {};
329 struct efi_device_path
*memdp
= NULL
;
332 EFIAPI
efi_status_t (*entry
)(efi_handle_t image_handle
,
333 struct efi_system_table
*st
);
336 * Special case for efi payload not loaded from disk, such as
337 * 'bootefi hello' or for example payload loaded directly into
338 * memory via jtag/etc:
340 if (!device_path
&& !image_path
) {
341 printf("WARNING: using memory device/image path, this may confuse some payloads!\n");
342 /* actual addresses filled in after efi_load_pe() */
343 memdp
= efi_dp_from_mem(0, 0, 0);
344 device_path
= image_path
= memdp
;
345 efi_add_handle(&mem_obj
);
347 ret
= efi_add_protocol(mem_obj
.handle
, &efi_guid_device_path
,
349 if (ret
!= EFI_SUCCESS
)
352 assert(device_path
&& image_path
);
355 efi_setup_loaded_image(&loaded_image_info
, &loaded_image_info_obj
,
356 device_path
, image_path
);
359 * gd lives in a fixed register which may get clobbered while we execute
360 * the payload. So save it here and restore it on every callback entry
364 /* Transfer environment variable bootargs as load options */
365 set_load_options(&loaded_image_info
, "bootargs");
366 /* Load the EFI payload */
367 entry
= efi_load_pe(efi
, &loaded_image_info
);
369 ret
= EFI_LOAD_ERROR
;
374 struct efi_device_path_memory
*mdp
= (void *)memdp
;
375 mdp
->memory_type
= loaded_image_info
.image_code_type
;
376 mdp
->start_address
= (uintptr_t)loaded_image_info
.image_base
;
377 mdp
->end_address
= mdp
->start_address
+
378 loaded_image_info
.image_size
;
381 /* we don't support much: */
382 env_set("efi_8be4df61-93ca-11d2-aa0d-00e098032b8c_OsIndicationsSupported",
383 "{ro,boot}(blob)0000000000000000");
385 /* Call our payload! */
386 debug("%s:%d Jumping to 0x%lx\n", __func__
, __LINE__
, (long)entry
);
388 if (setjmp(&loaded_image_info
.exit_jmp
)) {
389 ret
= loaded_image_info
.exit_status
;
394 /* On AArch64 we need to make sure we call our payload in < EL3 */
395 if (current_el() == 3) {
397 dcache_disable(); /* flush cache before switch to EL2 */
399 /* Move into EL2 and keep running there */
400 armv8_switch_to_el2((ulong
)entry
,
401 (ulong
)&loaded_image_info_obj
.handle
,
402 (ulong
)&systab
, 0, (ulong
)efi_run_in_el2
,
405 /* Should never reach here, efi exits with longjmp */
410 #ifdef CONFIG_ARMV7_NONSEC
411 if (armv7_boot_nonsec() && !is_nonsec
) {
412 dcache_disable(); /* flush cache before switch to HYP */
415 secure_ram_addr(_do_nonsec_entry
)(
418 (uintptr_t)loaded_image_info_obj
.handle
,
421 /* Should never reach here, efi exits with longjmp */
426 ret
= efi_do_enter(loaded_image_info_obj
.handle
, &systab
, entry
);
429 /* image has returned, loaded-image obj goes *poof*: */
430 list_del(&loaded_image_info_obj
.link
);
432 list_del(&mem_obj
.link
);
437 static int do_bootefi_bootmgr_exec(void)
439 struct efi_device_path
*device_path
, *file_path
;
444 * gd lives in a fixed register which may get clobbered while we execute
445 * the payload. So save it here and restore it on every callback entry
449 addr
= efi_bootmgr_load(&device_path
, &file_path
);
453 printf("## Starting EFI application at %p ...\n", addr
);
454 r
= do_bootefi_exec(addr
, device_path
, file_path
);
455 printf("## Application terminated, r = %lu\n",
456 r
& ~EFI_ERROR_MASK
);
458 if (r
!= EFI_SUCCESS
)
464 /* Interpreter command to boot an arbitrary EFI image from memory */
465 static int do_bootefi(cmd_tbl_t
*cmdtp
, int flag
, int argc
, char * const argv
[])
470 unsigned long fdt_addr
;
472 /* Allow unaligned memory access */
475 /* Initialize EFI drivers */
476 r
= efi_init_obj_list();
477 if (r
!= EFI_SUCCESS
) {
478 printf("Error: Cannot set up EFI drivers, r = %lu\n",
479 r
& ~EFI_ERROR_MASK
);
480 return CMD_RET_FAILURE
;
484 return CMD_RET_USAGE
;
487 fdt_addr
= simple_strtoul(argv
[2], NULL
, 16);
488 if (!fdt_addr
&& *argv
[2] != '0')
489 return CMD_RET_USAGE
;
490 /* Install device tree */
491 r
= efi_install_fdt(fdt_addr
);
492 if (r
!= EFI_SUCCESS
) {
493 printf("ERROR: failed to install device tree\n");
494 return CMD_RET_FAILURE
;
497 /* Remove device tree. EFI_NOT_FOUND can be ignored here */
498 efi_install_configuration_table(&efi_guid_fdt
, NULL
);
499 printf("WARNING: booting without device tree\n");
501 #ifdef CONFIG_CMD_BOOTEFI_HELLO
502 if (!strcmp(argv
[1], "hello")) {
503 ulong size
= __efi_helloworld_end
- __efi_helloworld_begin
;
505 saddr
= env_get("loadaddr");
507 addr
= simple_strtoul(saddr
, NULL
, 16);
509 addr
= CONFIG_SYS_LOAD_ADDR
;
510 memcpy(map_sysmem(addr
, size
), __efi_helloworld_begin
, size
);
513 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
514 if (!strcmp(argv
[1], "selftest")) {
515 struct efi_loaded_image loaded_image_info
= {};
516 struct efi_object loaded_image_info_obj
= {};
518 /* Construct a dummy device path. */
519 bootefi_device_path
= efi_dp_from_mem(EFI_RESERVED_MEMORY_TYPE
,
520 (uintptr_t)&efi_selftest
,
521 (uintptr_t)&efi_selftest
);
522 bootefi_image_path
= efi_dp_from_file(NULL
, 0, "\\selftest");
524 efi_setup_loaded_image(&loaded_image_info
,
525 &loaded_image_info_obj
,
526 bootefi_device_path
, bootefi_image_path
);
528 * gd lives in a fixed register which may get clobbered while we
529 * execute the payload. So save it here and restore it on every
533 /* Transfer environment variable efi_selftest as load options */
534 set_load_options(&loaded_image_info
, "efi_selftest");
535 /* Execute the test */
536 r
= efi_selftest(loaded_image_info_obj
.handle
, &systab
);
538 free(loaded_image_info
.load_options
);
539 list_del(&loaded_image_info_obj
.link
);
540 return r
!= EFI_SUCCESS
;
543 if (!strcmp(argv
[1], "bootmgr")) {
544 return do_bootefi_bootmgr_exec();
548 addr
= simple_strtoul(saddr
, NULL
, 16);
549 /* Check that a numeric value was passed */
550 if (!addr
&& *saddr
!= '0')
551 return CMD_RET_USAGE
;
555 printf("## Starting EFI application at %08lx ...\n", addr
);
556 r
= do_bootefi_exec(map_sysmem(addr
, 0), bootefi_device_path
,
558 printf("## Application terminated, r = %lu\n",
559 r
& ~EFI_ERROR_MASK
);
561 if (r
!= EFI_SUCCESS
)
567 #ifdef CONFIG_SYS_LONGHELP
568 static char bootefi_help_text
[] =
569 "<image address> [fdt address]\n"
570 " - boot EFI payload stored at address <image address>.\n"
571 " If specified, the device tree located at <fdt address> gets\n"
572 " exposed as EFI configuration table.\n"
573 #ifdef CONFIG_CMD_BOOTEFI_HELLO
575 " - boot a sample Hello World application stored within U-Boot\n"
577 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
578 "bootefi selftest [fdt address]\n"
579 " - boot an EFI selftest application stored within U-Boot\n"
580 " Use environment variable efi_selftest to select a single test.\n"
581 " Use 'setenv efi_selftest list' to enumerate all tests.\n"
583 "bootefi bootmgr [fdt addr]\n"
584 " - load and boot EFI payload based on BootOrder/BootXXXX variables.\n"
586 " If specified, the device tree located at <fdt address> gets\n"
587 " exposed as EFI configuration table.\n";
591 bootefi
, 3, 0, do_bootefi
,
592 "Boots an EFI payload from memory",
596 void efi_set_bootdev(const char *dev
, const char *devnr
, const char *path
)
598 char filename
[32] = { 0 }; /* dp->str is u16[32] long */
601 if (strcmp(dev
, "Net")) {
602 struct blk_desc
*desc
;
603 disk_partition_t fs_partition
;
606 part
= blk_get_device_part_str(dev
, devnr
, &desc
, &fs_partition
,
611 bootefi_device_path
= efi_dp_from_part(desc
, part
);
614 bootefi_device_path
= efi_dp_from_eth();
621 if (strcmp(dev
, "Net")) {
622 /* Add leading / to fs paths, because they're absolute */
623 snprintf(filename
, sizeof(filename
), "/%s", path
);
625 snprintf(filename
, sizeof(filename
), "%s", path
);
627 /* DOS style file path: */
629 while ((s
= strchr(s
, '/')))
631 bootefi_image_path
= efi_dp_from_file(NULL
, 0, filename
);