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 root node */
53 ret
= efi_root_node_register();
54 if (ret
!= EFI_SUCCESS
)
57 /* Initialize EFI driver uclass */
58 ret
= efi_driver_init();
59 if (ret
!= EFI_SUCCESS
)
62 ret
= efi_console_register();
63 if (ret
!= EFI_SUCCESS
)
65 #ifdef CONFIG_PARTITIONS
66 ret
= efi_disk_register();
67 if (ret
!= EFI_SUCCESS
)
70 #if defined(CONFIG_LCD) || defined(CONFIG_DM_VIDEO)
71 ret
= efi_gop_register();
72 if (ret
!= EFI_SUCCESS
)
76 ret
= efi_net_register();
77 if (ret
!= EFI_SUCCESS
)
80 #ifdef CONFIG_GENERATE_ACPI_TABLE
81 ret
= efi_acpi_register();
82 if (ret
!= EFI_SUCCESS
)
85 #ifdef CONFIG_GENERATE_SMBIOS_TABLE
86 ret
= efi_smbios_register();
87 if (ret
!= EFI_SUCCESS
)
90 ret
= efi_watchdog_register();
91 if (ret
!= EFI_SUCCESS
)
94 /* Initialize EFI runtime services */
95 ret
= efi_reset_system_init();
96 if (ret
!= EFI_SUCCESS
)
100 efi_obj_list_initialized
= ret
;
105 * Allow unaligned memory access.
107 * This routine is overridden by architectures providing this feature.
109 void __weak
allow_unaligned(void)
114 * Set the load options of an image from an environment variable.
116 * @loaded_image_info: the image
117 * @env_var: name of the environment variable
119 static void set_load_options(struct efi_loaded_image
*loaded_image_info
,
123 const char *env
= env_get(env_var
);
126 loaded_image_info
->load_options
= NULL
;
127 loaded_image_info
->load_options_size
= 0;
130 size
= utf8_utf16_strlen(env
) + 1;
131 loaded_image_info
->load_options
= calloc(size
, sizeof(u16
));
132 if (!loaded_image_info
->load_options
) {
133 printf("ERROR: Out of memory\n");
136 pos
= loaded_image_info
->load_options
;
137 utf8_utf16_strcpy(&pos
, env
);
138 loaded_image_info
->load_options_size
= size
* 2;
142 * copy_fdt() - Copy the device tree to a new location available to EFI
144 * The FDT is relocated into a suitable location within the EFI memory map.
145 * An additional 12KB is added to the space in case the device tree needs to be
146 * expanded later with fdt_open_into().
148 * @fdt_addr: On entry, address of start of FDT. On exit, address of relocated
150 * @fdt_sizep: Returns new size of FDT, including
151 * @return new relocated address of FDT
153 static efi_status_t
copy_fdt(ulong
*fdt_addrp
, ulong
*fdt_sizep
)
155 unsigned long fdt_ram_start
= -1L, fdt_pages
;
156 efi_status_t ret
= 0;
162 for (i
= 0; i
< CONFIG_NR_DRAM_BANKS
; i
++) {
163 u64 ram_start
= gd
->bd
->bi_dram
[i
].start
;
164 u64 ram_size
= gd
->bd
->bi_dram
[i
].size
;
169 if (ram_start
< fdt_ram_start
)
170 fdt_ram_start
= ram_start
;
174 * Give us at least 4KB of breathing room in case the device tree needs
175 * to be expanded later. Round up to the nearest EFI page boundary.
177 fdt
= map_sysmem(*fdt_addrp
, 0);
178 fdt_size
= fdt_totalsize(fdt
);
179 fdt_size
+= 4096 * 3;
180 fdt_size
= ALIGN(fdt_size
+ EFI_PAGE_SIZE
- 1, EFI_PAGE_SIZE
);
181 fdt_pages
= fdt_size
>> EFI_PAGE_SHIFT
;
183 /* Safe fdt location is at 127MB */
184 new_fdt_addr
= fdt_ram_start
+ (127 * 1024 * 1024) + fdt_size
;
185 ret
= efi_allocate_pages(EFI_ALLOCATE_MAX_ADDRESS
,
186 EFI_RUNTIME_SERVICES_DATA
, fdt_pages
,
188 if (ret
!= EFI_SUCCESS
) {
189 /* If we can't put it there, put it somewhere */
190 new_fdt_addr
= (ulong
)memalign(EFI_PAGE_SIZE
, fdt_size
);
191 ret
= efi_allocate_pages(EFI_ALLOCATE_MAX_ADDRESS
,
192 EFI_RUNTIME_SERVICES_DATA
, fdt_pages
,
194 if (ret
!= EFI_SUCCESS
) {
195 printf("ERROR: Failed to reserve space for FDT\n");
200 new_fdt
= map_sysmem(new_fdt_addr
, fdt_size
);
201 memcpy(new_fdt
, fdt
, fdt_totalsize(fdt
));
202 fdt_set_totalsize(new_fdt
, fdt_size
);
204 *fdt_addrp
= new_fdt_addr
;
205 *fdt_sizep
= fdt_size
;
210 static efi_status_t
efi_do_enter(
211 efi_handle_t image_handle
, struct efi_system_table
*st
,
212 EFIAPI
efi_status_t (*entry
)(
213 efi_handle_t image_handle
,
214 struct efi_system_table
*st
))
216 efi_status_t ret
= EFI_LOAD_ERROR
;
219 ret
= entry(image_handle
, st
);
220 st
->boottime
->exit(image_handle
, ret
, 0, NULL
);
225 static efi_status_t
efi_run_in_el2(EFIAPI
efi_status_t (*entry
)(
226 efi_handle_t image_handle
, struct efi_system_table
*st
),
227 efi_handle_t image_handle
, struct efi_system_table
*st
)
229 /* Enable caches again */
232 return efi_do_enter(image_handle
, st
, entry
);
236 #ifdef CONFIG_ARMV7_NONSEC
237 static bool is_nonsec
;
239 static efi_status_t
efi_run_in_hyp(EFIAPI
efi_status_t (*entry
)(
240 efi_handle_t image_handle
, struct efi_system_table
*st
),
241 efi_handle_t image_handle
, struct efi_system_table
*st
)
243 /* Enable caches again */
248 return efi_do_enter(image_handle
, st
, entry
);
253 * efi_carve_out_dt_rsv() - Carve out DT reserved memory ranges
255 * The mem_rsv entries of the FDT are added to the memory map. Any failures are
256 * ignored because this is not critical and we would rather continue to try to
259 * @fdt: Pointer to device tree
261 static void efi_carve_out_dt_rsv(void *fdt
)
264 uint64_t addr
, size
, pages
;
266 nr_rsv
= fdt_num_mem_rsv(fdt
);
268 /* Look for an existing entry and add it to the efi mem map. */
269 for (i
= 0; i
< nr_rsv
; i
++) {
270 if (fdt_get_mem_rsv(fdt
, i
, &addr
, &size
) != 0)
273 pages
= ALIGN(size
, EFI_PAGE_SIZE
) >> EFI_PAGE_SHIFT
;
274 if (!efi_add_memory_map(addr
, pages
, EFI_RESERVED_MEMORY_TYPE
,
276 printf("FDT memrsv map %d: Failed to add to map\n", i
);
280 static efi_status_t
efi_install_fdt(ulong fdt_addr
)
282 bootm_headers_t img
= { 0 };
283 ulong fdt_pages
, fdt_size
, fdt_start
;
287 fdt
= map_sysmem(fdt_addr
, 0);
288 if (fdt_check_header(fdt
)) {
289 printf("ERROR: invalid device tree\n");
290 return EFI_INVALID_PARAMETER
;
293 /* Prepare fdt for payload */
294 ret
= copy_fdt(&fdt_addr
, &fdt_size
);
299 fdt
= map_sysmem(fdt_addr
, 0);
300 fdt_size
= fdt_totalsize(fdt
);
301 if (image_setup_libfdt(&img
, fdt
, 0, NULL
)) {
302 printf("ERROR: failed to process device tree\n");
303 return EFI_LOAD_ERROR
;
306 efi_carve_out_dt_rsv(fdt
);
308 /* Link to it in the efi tables */
309 ret
= efi_install_configuration_table(&efi_guid_fdt
, fdt
);
310 if (ret
!= EFI_SUCCESS
)
311 return EFI_OUT_OF_RESOURCES
;
313 /* And reserve the space in the memory map */
314 fdt_start
= fdt_addr
;
315 fdt_pages
= fdt_size
>> EFI_PAGE_SHIFT
;
317 ret
= efi_add_memory_map(fdt_start
, fdt_pages
,
318 EFI_BOOT_SERVICES_DATA
, true);
324 * Load an EFI payload into a newly allocated piece of memory, register all
325 * EFI objects it would want to access and jump to it.
327 static efi_status_t
do_bootefi_exec(void *efi
,
328 struct efi_device_path
*device_path
,
329 struct efi_device_path
*image_path
)
331 struct efi_loaded_image loaded_image_info
= {};
332 struct efi_object loaded_image_info_obj
= {};
333 efi_handle_t mem_handle
= NULL
;
334 struct efi_device_path
*memdp
= NULL
;
337 EFIAPI
efi_status_t (*entry
)(efi_handle_t image_handle
,
338 struct efi_system_table
*st
);
341 * Special case for efi payload not loaded from disk, such as
342 * 'bootefi hello' or for example payload loaded directly into
343 * memory via jtag, etc:
345 if (!device_path
&& !image_path
) {
346 printf("WARNING: using memory device/image path, this may confuse some payloads!\n");
347 /* actual addresses filled in after efi_load_pe() */
348 memdp
= efi_dp_from_mem(0, 0, 0);
349 device_path
= image_path
= memdp
;
351 * Grub expects that the device path of the loaded image is
352 * installed on a handle.
354 ret
= efi_create_handle(&mem_handle
);
355 if (ret
!= EFI_SUCCESS
)
357 ret
= efi_add_protocol(mem_handle
, &efi_guid_device_path
,
359 if (ret
!= EFI_SUCCESS
)
362 assert(device_path
&& image_path
);
365 efi_setup_loaded_image(&loaded_image_info
, &loaded_image_info_obj
,
366 device_path
, image_path
);
369 * gd lives in a fixed register which may get clobbered while we execute
370 * the payload. So save it here and restore it on every callback entry
374 /* Transfer environment variable bootargs as load options */
375 set_load_options(&loaded_image_info
, "bootargs");
376 /* Load the EFI payload */
377 entry
= efi_load_pe(efi
, &loaded_image_info
);
379 ret
= EFI_LOAD_ERROR
;
384 struct efi_device_path_memory
*mdp
= (void *)memdp
;
385 mdp
->memory_type
= loaded_image_info
.image_code_type
;
386 mdp
->start_address
= (uintptr_t)loaded_image_info
.image_base
;
387 mdp
->end_address
= mdp
->start_address
+
388 loaded_image_info
.image_size
;
391 /* we don't support much: */
392 env_set("efi_8be4df61-93ca-11d2-aa0d-00e098032b8c_OsIndicationsSupported",
393 "{ro,boot}(blob)0000000000000000");
395 /* Call our payload! */
396 debug("%s:%d Jumping to 0x%lx\n", __func__
, __LINE__
, (long)entry
);
398 if (setjmp(&loaded_image_info
.exit_jmp
)) {
399 ret
= loaded_image_info
.exit_status
;
404 /* On AArch64 we need to make sure we call our payload in < EL3 */
405 if (current_el() == 3) {
407 dcache_disable(); /* flush cache before switch to EL2 */
409 /* Move into EL2 and keep running there */
410 armv8_switch_to_el2((ulong
)entry
,
411 (ulong
)loaded_image_info_obj
.handle
,
412 (ulong
)&systab
, 0, (ulong
)efi_run_in_el2
,
415 /* Should never reach here, efi exits with longjmp */
420 #ifdef CONFIG_ARMV7_NONSEC
421 if (armv7_boot_nonsec() && !is_nonsec
) {
422 dcache_disable(); /* flush cache before switch to HYP */
425 secure_ram_addr(_do_nonsec_entry
)(
428 (uintptr_t)loaded_image_info_obj
.handle
,
431 /* Should never reach here, efi exits with longjmp */
436 ret
= efi_do_enter(loaded_image_info_obj
.handle
, &systab
, entry
);
439 /* image has returned, loaded-image obj goes *poof*: */
440 list_del(&loaded_image_info_obj
.link
);
442 efi_delete_handle(mem_handle
);
447 static int do_bootefi_bootmgr_exec(void)
449 struct efi_device_path
*device_path
, *file_path
;
454 * gd lives in a fixed register which may get clobbered while we execute
455 * the payload. So save it here and restore it on every callback entry
459 addr
= efi_bootmgr_load(&device_path
, &file_path
);
463 printf("## Starting EFI application at %p ...\n", addr
);
464 r
= do_bootefi_exec(addr
, device_path
, file_path
);
465 printf("## Application terminated, r = %lu\n",
466 r
& ~EFI_ERROR_MASK
);
468 if (r
!= EFI_SUCCESS
)
474 /* Interpreter command to boot an arbitrary EFI image from memory */
475 static int do_bootefi(cmd_tbl_t
*cmdtp
, int flag
, int argc
, char * const argv
[])
480 unsigned long fdt_addr
;
482 /* Allow unaligned memory access */
485 /* Initialize EFI drivers */
486 r
= efi_init_obj_list();
487 if (r
!= EFI_SUCCESS
) {
488 printf("Error: Cannot set up EFI drivers, r = %lu\n",
489 r
& ~EFI_ERROR_MASK
);
490 return CMD_RET_FAILURE
;
494 return CMD_RET_USAGE
;
497 fdt_addr
= simple_strtoul(argv
[2], NULL
, 16);
498 if (!fdt_addr
&& *argv
[2] != '0')
499 return CMD_RET_USAGE
;
500 /* Install device tree */
501 r
= efi_install_fdt(fdt_addr
);
502 if (r
!= EFI_SUCCESS
) {
503 printf("ERROR: failed to install device tree\n");
504 return CMD_RET_FAILURE
;
507 /* Remove device tree. EFI_NOT_FOUND can be ignored here */
508 efi_install_configuration_table(&efi_guid_fdt
, NULL
);
509 printf("WARNING: booting without device tree\n");
511 #ifdef CONFIG_CMD_BOOTEFI_HELLO
512 if (!strcmp(argv
[1], "hello")) {
513 ulong size
= __efi_helloworld_end
- __efi_helloworld_begin
;
515 saddr
= env_get("loadaddr");
517 addr
= simple_strtoul(saddr
, NULL
, 16);
519 addr
= CONFIG_SYS_LOAD_ADDR
;
520 memcpy(map_sysmem(addr
, size
), __efi_helloworld_begin
, size
);
523 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
524 if (!strcmp(argv
[1], "selftest")) {
525 struct efi_loaded_image loaded_image_info
= {};
526 struct efi_object loaded_image_info_obj
= {};
528 /* Construct a dummy device path. */
529 bootefi_device_path
= efi_dp_from_mem(EFI_RESERVED_MEMORY_TYPE
,
530 (uintptr_t)&efi_selftest
,
531 (uintptr_t)&efi_selftest
);
532 bootefi_image_path
= efi_dp_from_file(NULL
, 0, "\\selftest");
534 efi_setup_loaded_image(&loaded_image_info
,
535 &loaded_image_info_obj
,
536 bootefi_device_path
, bootefi_image_path
);
538 * gd lives in a fixed register which may get clobbered while we
539 * execute the payload. So save it here and restore it on every
543 /* Transfer environment variable efi_selftest as load options */
544 set_load_options(&loaded_image_info
, "efi_selftest");
545 /* Execute the test */
546 r
= efi_selftest(loaded_image_info_obj
.handle
, &systab
);
548 free(loaded_image_info
.load_options
);
549 list_del(&loaded_image_info_obj
.link
);
550 return r
!= EFI_SUCCESS
;
553 if (!strcmp(argv
[1], "bootmgr")) {
554 return do_bootefi_bootmgr_exec();
558 addr
= simple_strtoul(saddr
, NULL
, 16);
559 /* Check that a numeric value was passed */
560 if (!addr
&& *saddr
!= '0')
561 return CMD_RET_USAGE
;
565 printf("## Starting EFI application at %08lx ...\n", addr
);
566 r
= do_bootefi_exec(map_sysmem(addr
, 0), bootefi_device_path
,
568 printf("## Application terminated, r = %lu\n",
569 r
& ~EFI_ERROR_MASK
);
571 if (r
!= EFI_SUCCESS
)
577 #ifdef CONFIG_SYS_LONGHELP
578 static char bootefi_help_text
[] =
579 "<image address> [fdt address]\n"
580 " - boot EFI payload stored at address <image address>.\n"
581 " If specified, the device tree located at <fdt address> gets\n"
582 " exposed as EFI configuration table.\n"
583 #ifdef CONFIG_CMD_BOOTEFI_HELLO
585 " - boot a sample Hello World application stored within U-Boot\n"
587 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
588 "bootefi selftest [fdt address]\n"
589 " - boot an EFI selftest application stored within U-Boot\n"
590 " Use environment variable efi_selftest to select a single test.\n"
591 " Use 'setenv efi_selftest list' to enumerate all tests.\n"
593 "bootefi bootmgr [fdt addr]\n"
594 " - load and boot EFI payload based on BootOrder/BootXXXX variables.\n"
596 " If specified, the device tree located at <fdt address> gets\n"
597 " exposed as EFI configuration table.\n";
601 bootefi
, 3, 0, do_bootefi
,
602 "Boots an EFI payload from memory",
606 void efi_set_bootdev(const char *dev
, const char *devnr
, const char *path
)
608 char filename
[32] = { 0 }; /* dp->str is u16[32] long */
611 /* efi_set_bootdev is typically called repeatedly, recover memory */
612 efi_free_pool(bootefi_device_path
);
613 efi_free_pool(bootefi_image_path
);
614 /* If blk_get_device_part_str fails, avoid duplicate free. */
615 bootefi_device_path
= NULL
;
616 bootefi_image_path
= NULL
;
618 if (strcmp(dev
, "Net")) {
619 struct blk_desc
*desc
;
620 disk_partition_t fs_partition
;
623 part
= blk_get_device_part_str(dev
, devnr
, &desc
, &fs_partition
,
628 bootefi_device_path
= efi_dp_from_part(desc
, part
);
631 bootefi_device_path
= efi_dp_from_eth();
638 if (strcmp(dev
, "Net")) {
639 /* Add leading / to fs paths, because they're absolute */
640 snprintf(filename
, sizeof(filename
), "/%s", path
);
642 snprintf(filename
, sizeof(filename
), "%s", path
);
644 /* DOS style file path: */
646 while ((s
= strchr(s
, '/')))
648 bootefi_image_path
= efi_dp_from_file(NULL
, 0, filename
);