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-generic/sections.h>
20 #include <linux/linkage.h>
22 DECLARE_GLOBAL_DATA_PTR
;
24 static struct efi_device_path
*bootefi_image_path
;
25 static struct efi_device_path
*bootefi_device_path
;
28 * Set the load options of an image from an environment variable.
30 * @handle: the image handle
31 * @env_var: name of the environment variable
34 static efi_status_t
set_load_options(efi_handle_t handle
, const char *env_var
)
36 struct efi_loaded_image
*loaded_image_info
;
38 const char *env
= env_get(env_var
);
42 ret
= EFI_CALL(systab
.boottime
->open_protocol(
44 &efi_guid_loaded_image
,
45 (void **)&loaded_image_info
,
47 EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL
));
48 if (ret
!= EFI_SUCCESS
)
49 return EFI_INVALID_PARAMETER
;
51 loaded_image_info
->load_options
= NULL
;
52 loaded_image_info
->load_options_size
= 0;
56 size
= utf8_utf16_strlen(env
) + 1;
57 loaded_image_info
->load_options
= calloc(size
, sizeof(u16
));
58 if (!loaded_image_info
->load_options
) {
59 printf("ERROR: Out of memory\n");
60 EFI_CALL(systab
.boottime
->close_protocol(handle
,
61 &efi_guid_loaded_image
,
63 return EFI_OUT_OF_RESOURCES
;
65 pos
= loaded_image_info
->load_options
;
66 utf8_utf16_strcpy(&pos
, env
);
67 loaded_image_info
->load_options_size
= size
* 2;
70 return EFI_CALL(systab
.boottime
->close_protocol(handle
,
71 &efi_guid_loaded_image
,
75 #if !CONFIG_IS_ENABLED(GENERATE_ACPI_TABLE)
78 * copy_fdt() - Copy the device tree to a new location available to EFI
80 * The FDT is copied to a suitable location within the EFI memory map.
81 * Additional 12 KiB are added to the space in case the device tree needs to be
82 * expanded later with fdt_open_into().
84 * @fdtp: On entry a pointer to the flattened device tree.
85 * On exit a pointer to the copy of the flattened device tree.
89 static efi_status_t
copy_fdt(void **fdtp
)
91 unsigned long fdt_ram_start
= -1L, fdt_pages
;
98 for (i
= 0; i
< CONFIG_NR_DRAM_BANKS
; i
++) {
99 u64 ram_start
= gd
->bd
->bi_dram
[i
].start
;
100 u64 ram_size
= gd
->bd
->bi_dram
[i
].size
;
105 if (ram_start
< fdt_ram_start
)
106 fdt_ram_start
= ram_start
;
110 * Give us at least 12 KiB of breathing room in case the device tree
111 * needs to be expanded later.
114 fdt_pages
= efi_size_in_pages(fdt_totalsize(fdt
) + 0x3000);
115 fdt_size
= fdt_pages
<< EFI_PAGE_SHIFT
;
118 * Safe fdt location is at 127 MiB.
119 * On the sandbox convert from the sandbox address space.
121 new_fdt_addr
= (uintptr_t)map_sysmem(fdt_ram_start
+ 0x7f00000 +
123 ret
= efi_allocate_pages(EFI_ALLOCATE_MAX_ADDRESS
,
124 EFI_BOOT_SERVICES_DATA
, fdt_pages
,
126 if (ret
!= EFI_SUCCESS
) {
127 /* If we can't put it there, put it somewhere */
128 new_fdt_addr
= (ulong
)memalign(EFI_PAGE_SIZE
, fdt_size
);
129 ret
= efi_allocate_pages(EFI_ALLOCATE_MAX_ADDRESS
,
130 EFI_BOOT_SERVICES_DATA
, fdt_pages
,
132 if (ret
!= EFI_SUCCESS
) {
133 printf("ERROR: Failed to reserve space for FDT\n");
137 new_fdt
= (void *)(uintptr_t)new_fdt_addr
;
138 memcpy(new_fdt
, fdt
, fdt_totalsize(fdt
));
139 fdt_set_totalsize(new_fdt
, fdt_size
);
141 *fdtp
= (void *)(uintptr_t)new_fdt_addr
;
147 * efi_carve_out_dt_rsv() - Carve out DT reserved memory ranges
149 * The mem_rsv entries of the FDT are added to the memory map. Any failures are
150 * ignored because this is not critical and we would rather continue to try to
153 * @fdt: Pointer to device tree
155 static void efi_carve_out_dt_rsv(void *fdt
)
158 uint64_t addr
, size
, pages
;
160 nr_rsv
= fdt_num_mem_rsv(fdt
);
162 /* Look for an existing entry and add it to the efi mem map. */
163 for (i
= 0; i
< nr_rsv
; i
++) {
164 if (fdt_get_mem_rsv(fdt
, i
, &addr
, &size
) != 0)
167 /* Convert from sandbox address space. */
168 addr
= (uintptr_t)map_sysmem(addr
, 0);
170 pages
= efi_size_in_pages(size
+ (addr
& EFI_PAGE_MASK
));
171 addr
&= ~EFI_PAGE_MASK
;
172 if (efi_add_memory_map(addr
, pages
, EFI_RESERVED_MEMORY_TYPE
,
173 false) != EFI_SUCCESS
)
174 printf("FDT memrsv map %d: Failed to add to map\n", i
);
179 * get_config_table() - get configuration table
181 * @guid: GUID of the configuration table
182 * Return: pointer to configuration table or NULL
184 static void *get_config_table(const efi_guid_t
*guid
)
188 for (i
= 0; i
< systab
.nr_tables
; i
++) {
189 if (!guidcmp(guid
, &systab
.tables
[i
].guid
))
190 return systab
.tables
[i
].table
;
195 #endif /* !CONFIG_IS_ENABLED(GENERATE_ACPI_TABLE) */
198 * efi_install_fdt() - install fdt passed by a command argument
200 * If fdt_opt is available, the device tree located at that memory address will
201 * will be installed as configuration table, otherwise the device tree located
202 * at the address indicated by environment variable fdtcontroladdr will be used.
204 * On architectures (x86) using ACPI tables device trees shall not be installed
205 * as configuration table.
207 * @fdt_opt: pointer to argument
208 * Return: status code
210 static efi_status_t
efi_install_fdt(const char *fdt_opt
)
213 * The EBBR spec requires that we have either an FDT or an ACPI table
216 #if CONFIG_IS_ENABLED(GENERATE_ACPI_TABLE)
218 printf("ERROR: can't have ACPI table and device tree.\n");
219 return EFI_LOAD_ERROR
;
222 unsigned long fdt_addr
;
224 bootm_headers_t img
= { 0 };
228 fdt_addr
= simple_strtoul(fdt_opt
, NULL
, 16);
230 return EFI_INVALID_PARAMETER
;
232 /* Look for device tree that is already installed */
233 if (get_config_table(&efi_guid_fdt
))
235 /* Use our own device tree as default */
236 fdt_opt
= env_get("fdtcontroladdr");
238 printf("ERROR: need device tree\n");
239 return EFI_NOT_FOUND
;
241 fdt_addr
= simple_strtoul(fdt_opt
, NULL
, 16);
243 printf("ERROR: invalid $fdtcontroladdr\n");
244 return EFI_LOAD_ERROR
;
248 /* Install device tree */
249 fdt
= map_sysmem(fdt_addr
, 0);
250 if (fdt_check_header(fdt
)) {
251 printf("ERROR: invalid device tree\n");
252 return EFI_LOAD_ERROR
;
255 /* Create memory reservations as indicated by the device tree */
256 efi_carve_out_dt_rsv(fdt
);
258 /* Prepare device tree for payload */
259 ret
= copy_fdt(&fdt
);
261 printf("ERROR: out of memory\n");
262 return EFI_OUT_OF_RESOURCES
;
265 if (image_setup_libfdt(&img
, fdt
, 0, NULL
)) {
266 printf("ERROR: failed to process device tree\n");
267 return EFI_LOAD_ERROR
;
270 /* Install device tree as UEFI table */
271 ret
= efi_install_configuration_table(&efi_guid_fdt
, fdt
);
272 if (ret
!= EFI_SUCCESS
) {
273 printf("ERROR: failed to install device tree\n");
276 #endif /* GENERATE_ACPI_TABLE */
282 * do_bootefi_exec() - execute EFI binary
284 * @handle: handle of loaded image
285 * Return: status code
287 * Load the EFI binary into a newly assigned memory unwinding the relocation
288 * information, install the loaded image protocol, and call the binary.
290 static efi_status_t
do_bootefi_exec(efi_handle_t handle
)
293 efi_uintn_t exit_data_size
= 0;
294 u16
*exit_data
= NULL
;
296 /* Transfer environment variable as load options */
297 ret
= set_load_options(handle
, "bootargs");
298 if (ret
!= EFI_SUCCESS
)
301 /* Call our payload! */
302 ret
= EFI_CALL(efi_start_image(handle
, &exit_data_size
, &exit_data
));
303 printf("## Application terminated, r = %lu\n", ret
& ~EFI_ERROR_MASK
);
304 if (ret
&& exit_data
) {
305 printf("## %ls\n", exit_data
);
306 efi_free_pool(exit_data
);
312 * FIXME: Who is responsible for
313 * free(loaded_image_info->load_options);
314 * Once efi_exit() is implemented correctly,
315 * handle itself doesn't exist here.
322 * do_efibootmgr() - execute EFI boot manager
324 * Return: status code
326 static int do_efibootmgr(void)
331 ret
= efi_bootmgr_load(&handle
);
332 if (ret
!= EFI_SUCCESS
) {
333 printf("EFI boot manager: Cannot load any image\n");
334 return CMD_RET_FAILURE
;
337 ret
= do_bootefi_exec(handle
);
339 if (ret
!= EFI_SUCCESS
)
340 return CMD_RET_FAILURE
;
342 return CMD_RET_SUCCESS
;
346 * do_bootefi_image() - execute EFI binary
348 * Set up memory image for the binary to be loaded, prepare device path, and
349 * then call do_bootefi_exec() to execute it.
351 * @image_opt: string of image start address
352 * Return: status code
354 static int do_bootefi_image(const char *image_opt
)
357 struct efi_device_path
*device_path
, *image_path
;
358 struct efi_device_path
*file_path
= NULL
;
359 unsigned long addr
, size
;
360 const char *size_str
;
361 efi_handle_t mem_handle
= NULL
, handle
;
364 #ifdef CONFIG_CMD_BOOTEFI_HELLO
365 if (!strcmp(image_opt
, "hello")) {
368 saddr
= env_get("loadaddr");
369 size
= __efi_helloworld_end
- __efi_helloworld_begin
;
372 addr
= simple_strtoul(saddr
, NULL
, 16);
374 addr
= CONFIG_SYS_LOAD_ADDR
;
376 image_buf
= map_sysmem(addr
, size
);
377 memcpy(image_buf
, __efi_helloworld_begin
, size
);
384 size_str
= env_get("filesize");
386 size
= simple_strtoul(size_str
, NULL
, 16);
390 addr
= simple_strtoul(image_opt
, NULL
, 16);
391 /* Check that a numeric value was passed */
392 if (!addr
&& *image_opt
!= '0')
393 return CMD_RET_USAGE
;
395 image_buf
= map_sysmem(addr
, size
);
397 device_path
= bootefi_device_path
;
398 image_path
= bootefi_image_path
;
401 if (!device_path
&& !image_path
) {
403 * Special case for efi payload not loaded from disk,
404 * such as 'bootefi hello' or for example payload
405 * loaded directly into memory via JTAG, etc:
407 file_path
= efi_dp_from_mem(EFI_RESERVED_MEMORY_TYPE
,
408 (uintptr_t)image_buf
, size
);
410 * Make sure that device for device_path exist
411 * in load_image(). Otherwise, shell and grub will fail.
413 ret
= efi_create_handle(&mem_handle
);
414 if (ret
!= EFI_SUCCESS
)
417 ret
= efi_add_protocol(mem_handle
, &efi_guid_device_path
,
419 if (ret
!= EFI_SUCCESS
)
422 assert(device_path
&& image_path
);
423 file_path
= efi_dp_append(device_path
, image_path
);
426 ret
= EFI_CALL(efi_load_image(false, efi_root
,
427 file_path
, image_buf
, size
, &handle
));
428 if (ret
!= EFI_SUCCESS
)
431 ret
= do_bootefi_exec(handle
);
435 efi_delete_handle(mem_handle
);
437 efi_free_pool(file_path
);
439 if (ret
!= EFI_SUCCESS
)
440 return CMD_RET_FAILURE
;
442 return CMD_RET_SUCCESS
;
445 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
446 static efi_status_t
bootefi_run_prepare(const char *load_options_path
,
447 struct efi_device_path
*device_path
,
448 struct efi_device_path
*image_path
,
449 struct efi_loaded_image_obj
**image_objp
,
450 struct efi_loaded_image
**loaded_image_infop
)
454 ret
= efi_setup_loaded_image(device_path
, image_path
, image_objp
,
456 if (ret
!= EFI_SUCCESS
)
459 /* Transfer environment variable as load options */
460 return set_load_options((efi_handle_t
)*image_objp
, load_options_path
);
464 * bootefi_test_prepare() - prepare to run an EFI test
466 * Prepare to run a test as if it were provided by a loaded image.
468 * @image_objp: pointer to be set to the loaded image handle
469 * @loaded_image_infop: pointer to be set to the loaded image protocol
470 * @path: dummy file path used to construct the device path
471 * set in the loaded image protocol
472 * @load_options_path: name of a U-Boot environment variable. Its value is
473 * set as load options in the loaded image protocol.
474 * Return: status code
476 static efi_status_t bootefi_test_prepare
477 (struct efi_loaded_image_obj
**image_objp
,
478 struct efi_loaded_image
**loaded_image_infop
, const char *path
,
479 const char *load_options_path
)
483 /* Construct a dummy device path */
484 bootefi_device_path
= efi_dp_from_mem(EFI_RESERVED_MEMORY_TYPE
, 0, 0);
485 if (!bootefi_device_path
)
486 return EFI_OUT_OF_RESOURCES
;
488 bootefi_image_path
= efi_dp_from_file(NULL
, 0, path
);
489 if (!bootefi_image_path
) {
490 ret
= EFI_OUT_OF_RESOURCES
;
494 ret
= bootefi_run_prepare(load_options_path
, bootefi_device_path
,
495 bootefi_image_path
, image_objp
,
497 if (ret
== EFI_SUCCESS
)
500 efi_free_pool(bootefi_image_path
);
501 bootefi_image_path
= NULL
;
503 efi_free_pool(bootefi_device_path
);
504 bootefi_device_path
= NULL
;
509 * bootefi_run_finish() - finish up after running an EFI test
511 * @loaded_image_info: Pointer to a struct which holds the loaded image info
512 * @image_obj: Pointer to a struct which holds the loaded image object
514 static void bootefi_run_finish(struct efi_loaded_image_obj
*image_obj
,
515 struct efi_loaded_image
*loaded_image_info
)
518 free(loaded_image_info
->load_options
);
519 efi_delete_handle(&image_obj
->header
);
523 * do_efi_selftest() - execute EFI selftest
525 * Return: status code
527 static int do_efi_selftest(void)
529 struct efi_loaded_image_obj
*image_obj
;
530 struct efi_loaded_image
*loaded_image_info
;
533 ret
= bootefi_test_prepare(&image_obj
, &loaded_image_info
,
534 "\\selftest", "efi_selftest");
535 if (ret
!= EFI_SUCCESS
)
536 return CMD_RET_FAILURE
;
538 /* Execute the test */
539 ret
= EFI_CALL(efi_selftest(&image_obj
->header
, &systab
));
540 bootefi_run_finish(image_obj
, loaded_image_info
);
542 return ret
!= EFI_SUCCESS
;
544 #endif /* CONFIG_CMD_BOOTEFI_SELFTEST */
547 * do_bootefi() - execute `bootefi` command
549 * @cmdtp: table entry describing command
550 * @flag: bitmap indicating how the command was invoked
551 * @argc: number of arguments
552 * @argv: command line arguments
553 * Return: status code
555 static int do_bootefi(cmd_tbl_t
*cmdtp
, int flag
, int argc
, char * const argv
[])
560 return CMD_RET_USAGE
;
562 /* Initialize EFI drivers */
563 ret
= efi_init_obj_list();
564 if (ret
!= EFI_SUCCESS
) {
565 printf("Error: Cannot initialize UEFI sub-system, r = %lu\n",
566 ret
& ~EFI_ERROR_MASK
);
567 return CMD_RET_FAILURE
;
570 ret
= efi_install_fdt(argc
> 2 ? argv
[2] : NULL
);
571 if (ret
== EFI_INVALID_PARAMETER
)
572 return CMD_RET_USAGE
;
573 else if (ret
!= EFI_SUCCESS
)
574 return CMD_RET_FAILURE
;
576 if (!strcmp(argv
[1], "bootmgr"))
577 return do_efibootmgr();
578 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
579 else if (!strcmp(argv
[1], "selftest"))
580 return do_efi_selftest();
583 return do_bootefi_image(argv
[1]);
586 #ifdef CONFIG_SYS_LONGHELP
587 static char bootefi_help_text
[] =
588 "<image address> [fdt address]\n"
589 " - boot EFI payload stored at address <image address>.\n"
590 " If specified, the device tree located at <fdt address> gets\n"
591 " exposed as EFI configuration table.\n"
592 #ifdef CONFIG_CMD_BOOTEFI_HELLO
594 " - boot a sample Hello World application stored within U-Boot\n"
596 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
597 "bootefi selftest [fdt address]\n"
598 " - boot an EFI selftest application stored within U-Boot\n"
599 " Use environment variable efi_selftest to select a single test.\n"
600 " Use 'setenv efi_selftest list' to enumerate all tests.\n"
602 "bootefi bootmgr [fdt address]\n"
603 " - load and boot EFI payload based on BootOrder/BootXXXX variables.\n"
605 " If specified, the device tree located at <fdt address> gets\n"
606 " exposed as EFI configuration table.\n";
610 bootefi
, 3, 0, do_bootefi
,
611 "Boots an EFI payload from memory",
616 * efi_set_bootdev() - set boot device
618 * This function is called when a file is loaded, e.g. via the 'load' command.
619 * We use the path to this file to inform the UEFI binary about the boot device.
621 * @dev: device, e.g. "MMC"
622 * @devnr: number of the device, e.g. "1:2"
623 * @path: path to file loaded
625 void efi_set_bootdev(const char *dev
, const char *devnr
, const char *path
)
627 struct efi_device_path
*device
, *image
;
630 /* efi_set_bootdev is typically called repeatedly, recover memory */
631 efi_free_pool(bootefi_device_path
);
632 efi_free_pool(bootefi_image_path
);
634 ret
= efi_dp_from_name(dev
, devnr
, path
, &device
, &image
);
635 if (ret
== EFI_SUCCESS
) {
636 bootefi_device_path
= device
;
638 /* FIXME: image should not contain device */
639 struct efi_device_path
*image_tmp
= image
;
641 efi_dp_split_file_path(image
, &device
, &image
);
642 efi_free_pool(image_tmp
);
644 bootefi_image_path
= image
;
646 bootefi_device_path
= NULL
;
647 bootefi_image_path
= NULL
;