1 /* SPDX-License-Identifier: GPL-2.0+ */
3 * EFI application loader
5 * Copyright (c) 2016 Alexander Graf
9 #define _EFI_LOADER_H 1
15 static inline int guidcmp(const void *g1, const void *g2)
17 return memcmp(g1, g2, sizeof(efi_guid_t));
20 /* No need for efi loader support in SPL */
21 #if CONFIG_IS_ENABLED(EFI_LOADER)
23 #include <linux/list.h>
25 /* Maximum number of configuration tables */
26 #define EFI_MAX_CONFIGURATION_TABLES 16
28 /* GUID used by the root node */
30 EFI_GUID(0xe61d73b9, 0xa384, 0x4acc, \
31 0xae, 0xab, 0x82, 0xe8, 0x28, 0xf3, 0x62, 0x8b)
32 /* GUID used as host device on sandbox */
33 #define U_BOOT_HOST_DEV_GUID \
34 EFI_GUID(0xbbe4e671, 0x5773, 0x4ea1, \
35 0x9a, 0xab, 0x3a, 0x7d, 0xbf, 0x40, 0xc4, 0x82)
37 /* Use internal device tree when starting UEFI application */
38 #define EFI_FDT_USE_INTERNAL 0UL
41 extern efi_handle_t efi_root;
43 int __efi_entry_check(void);
44 int __efi_exit_check(void);
45 const char *__efi_nesting(void);
46 const char *__efi_nesting_inc(void);
47 const char *__efi_nesting_dec(void);
50 * Enter the u-boot world from UEFI:
52 #define EFI_ENTRY(format, ...) do { \
53 assert(__efi_entry_check()); \
54 debug("%sEFI: Entry %s(" format ")\n", __efi_nesting_inc(), \
55 __func__, ##__VA_ARGS__); \
59 * Exit the u-boot world back to UEFI:
61 #define EFI_EXIT(ret) ({ \
62 typeof(ret) _r = ret; \
63 debug("%sEFI: Exit: %s: %u\n", __efi_nesting_dec(), \
64 __func__, (u32)((uintptr_t) _r & ~EFI_ERROR_MASK)); \
65 assert(__efi_exit_check()); \
70 * Call non-void UEFI function from u-boot and retrieve return value:
72 #define EFI_CALL(exp) ({ \
73 debug("%sEFI: Call: %s\n", __efi_nesting_inc(), #exp); \
74 assert(__efi_exit_check()); \
75 typeof(exp) _r = exp; \
76 assert(__efi_entry_check()); \
77 debug("%sEFI: %lu returned by %s\n", __efi_nesting_dec(), \
78 (unsigned long)((uintptr_t)_r & ~EFI_ERROR_MASK), #exp); \
83 * Call void UEFI function from u-boot:
85 #define EFI_CALL_VOID(exp) do { \
86 debug("%sEFI: Call: %s\n", __efi_nesting_inc(), #exp); \
87 assert(__efi_exit_check()); \
89 assert(__efi_entry_check()); \
90 debug("%sEFI: Return From: %s\n", __efi_nesting_dec(), #exp); \
94 * Write an indented message with EFI prefix
96 #define EFI_PRINT(format, ...) ({ \
97 debug("%sEFI: " format, __efi_nesting(), \
101 #ifdef CONFIG_SYS_CACHELINE_SIZE
102 #define EFI_CACHELINE_SIZE CONFIG_SYS_CACHELINE_SIZE
104 /* Just use the greatest cache flush alignment requirement I'm aware of */
105 #define EFI_CACHELINE_SIZE 128
108 /* Key identifying current memory map */
109 extern efi_uintn_t efi_memory_map_key;
111 extern struct efi_runtime_services efi_runtime_services;
112 extern struct efi_system_table systab;
114 extern struct efi_simple_text_output_protocol efi_con_out;
115 extern struct efi_simple_text_input_protocol efi_con_in;
116 extern struct efi_console_control_protocol efi_console_control;
117 extern const struct efi_device_path_to_text_protocol efi_device_path_to_text;
118 /* implementation of the EFI_DEVICE_PATH_UTILITIES_PROTOCOL */
119 extern const struct efi_device_path_utilities_protocol
120 efi_device_path_utilities;
121 /* deprecated version of the EFI_UNICODE_COLLATION_PROTOCOL */
122 extern const struct efi_unicode_collation_protocol
123 efi_unicode_collation_protocol;
124 /* current version of the EFI_UNICODE_COLLATION_PROTOCOL */
125 extern const struct efi_unicode_collation_protocol
126 efi_unicode_collation_protocol2;
127 extern const struct efi_hii_config_routing_protocol efi_hii_config_routing;
128 extern const struct efi_hii_config_access_protocol efi_hii_config_access;
129 extern const struct efi_hii_database_protocol efi_hii_database;
130 extern const struct efi_hii_string_protocol efi_hii_string;
132 uint16_t *efi_dp_str(struct efi_device_path *dp);
134 /* GUID of the U-Boot root node */
135 extern const efi_guid_t efi_u_boot_guid;
136 #ifdef CONFIG_SANDBOX
137 /* GUID of U-Boot host device on sandbox */
138 extern const efi_guid_t efi_guid_host_dev;
140 /* GUID of the EFI_BLOCK_IO_PROTOCOL */
141 extern const efi_guid_t efi_block_io_guid;
142 extern const efi_guid_t efi_global_variable_guid;
143 extern const efi_guid_t efi_guid_console_control;
144 extern const efi_guid_t efi_guid_device_path;
145 /* GUID of the EFI_DRIVER_BINDING_PROTOCOL */
146 extern const efi_guid_t efi_guid_driver_binding_protocol;
147 /* event group ExitBootServices() invoked */
148 extern const efi_guid_t efi_guid_event_group_exit_boot_services;
149 /* event group SetVirtualAddressMap() invoked */
150 extern const efi_guid_t efi_guid_event_group_virtual_address_change;
151 /* event group memory map changed */
152 extern const efi_guid_t efi_guid_event_group_memory_map_change;
153 /* event group boot manager about to boot */
154 extern const efi_guid_t efi_guid_event_group_ready_to_boot;
155 /* event group ResetSystem() invoked (before ExitBootServices) */
156 extern const efi_guid_t efi_guid_event_group_reset_system;
157 /* GUID of the device tree table */
158 extern const efi_guid_t efi_guid_fdt;
159 extern const efi_guid_t efi_guid_loaded_image;
160 extern const efi_guid_t efi_guid_loaded_image_device_path;
161 extern const efi_guid_t efi_guid_device_path_to_text_protocol;
162 extern const efi_guid_t efi_simple_file_system_protocol_guid;
163 extern const efi_guid_t efi_file_info_guid;
164 /* GUID for file system information */
165 extern const efi_guid_t efi_file_system_info_guid;
166 extern const efi_guid_t efi_guid_device_path_utilities_protocol;
167 /* GUID of the deprecated Unicode collation protocol */
168 extern const efi_guid_t efi_guid_unicode_collation_protocol;
169 /* GUID of the Unicode collation protocol */
170 extern const efi_guid_t efi_guid_unicode_collation_protocol2;
171 extern const efi_guid_t efi_guid_hii_config_routing_protocol;
172 extern const efi_guid_t efi_guid_hii_config_access_protocol;
173 extern const efi_guid_t efi_guid_hii_database_protocol;
174 extern const efi_guid_t efi_guid_hii_string_protocol;
176 extern unsigned int __efi_runtime_start, __efi_runtime_stop;
177 extern unsigned int __efi_runtime_rel_start, __efi_runtime_rel_stop;
180 * struct efi_open_protocol_info_item - open protocol info item
182 * When a protocol is opened a open protocol info entry is created.
183 * These are maintained in a list.
185 * @link: link to the list of open protocol info entries of a protocol
186 * @info: information about the opening of a protocol
188 struct efi_open_protocol_info_item {
189 struct list_head link;
190 struct efi_open_protocol_info_entry info;
194 * struct efi_handler - single protocol interface of a handle
196 * When the UEFI payload wants to open a protocol on an object to get its
197 * interface (usually a struct with callback functions), this struct maps the
198 * protocol GUID to the respective protocol interface
200 * @link: link to the list of protocols of a handle
201 * @guid: GUID of the protocol
202 * @protocol_interface: protocol interface
203 * @open_infos link to the list of open protocol info items
206 struct list_head link;
207 const efi_guid_t *guid;
208 void *protocol_interface;
209 struct list_head open_infos;
213 * enum efi_object_type - type of EFI object
215 * In UnloadImage we must be able to identify if the handle relates to a
218 enum efi_object_type {
219 EFI_OBJECT_TYPE_UNDEFINED = 0,
220 EFI_OBJECT_TYPE_U_BOOT_FIRMWARE,
221 EFI_OBJECT_TYPE_LOADED_IMAGE,
222 EFI_OBJECT_TYPE_STARTED_IMAGE,
226 * struct efi_object - dereferenced EFI handle
228 * @link: pointers to put the handle into a linked list
229 * @protocols: linked list with the protocol interfaces installed on this
232 * UEFI offers a flexible and expandable object model. The objects in the UEFI
233 * API are devices, drivers, and loaded images. struct efi_object is our storage
234 * structure for these objects.
236 * When including this structure into a larger structure always put it first so
237 * that when deleting a handle the whole encompassing structure can be freed.
239 * A pointer to this structure is referred to as a handle. Typedef efi_handle_t
240 * has been created for such pointers.
243 /* Every UEFI object is part of a global object list */
244 struct list_head link;
245 /* The list of protocols */
246 struct list_head protocols;
247 enum efi_object_type type;
251 * struct efi_loaded_image_obj - handle of a loaded image
253 * @header: EFI object header
254 * @exit_status: exit status passed to Exit()
255 * @exit_data_size: exit data size passed to Exit()
256 * @exit_data: exit data passed to Exit()
257 * @exit_jmp: long jump buffer for returning form started image
258 * @entry: entry address of the relocated image
260 struct efi_loaded_image_obj {
261 struct efi_object header;
262 efi_status_t exit_status;
263 efi_uintn_t *exit_data_size;
265 struct jmp_buf_data exit_jmp;
266 EFIAPI efi_status_t (*entry)(efi_handle_t image_handle,
267 struct efi_system_table *st);
274 * @link: Link to list of all events
275 * @queue_link: Link to the list of queued events
276 * @type: Type of event, see efi_create_event
277 * @notify_tpl: Task priority level of notifications
278 * @nofify_function: Function to call when the event is triggered
279 * @notify_context: Data to be passed to the notify function
280 * @group: Event group
281 * @trigger_time: Period of the timer
282 * @trigger_next: Next time to trigger the timer
283 * @trigger_type: Type of timer, see efi_set_timer
284 * @is_signaled: The event occurred. The event is in the signaled state.
287 struct list_head link;
288 struct list_head queue_link;
290 efi_uintn_t notify_tpl;
291 void (EFIAPI *notify_function)(struct efi_event *event, void *context);
292 void *notify_context;
293 const efi_guid_t *group;
296 enum efi_timer_delay trigger_type;
300 /* This list contains all UEFI objects we know of */
301 extern struct list_head efi_obj_list;
302 /* List of all events */
303 extern struct list_head efi_events;
306 * struct efi_protocol_notification - handle for notified protocol
308 * When a protocol interface is installed for which an event was registered with
309 * the RegisterProtocolNotify() service this structure is used to hold the
310 * handle on which the protocol interface was installed.
312 * @link: link to list of all handles notified for this event
313 * @handle: handle on which the notified protocol interface was installed
315 struct efi_protocol_notification {
316 struct list_head link;
321 * efi_register_notify_event - event registered by RegisterProtocolNotify()
323 * The address of this structure serves as registration value.
325 * @link: link to list of all registered events
326 * @event: registered event. The same event may registered for multiple
328 * @protocol: protocol for which the event is registered
329 * @handles: linked list of all handles on which the notified protocol was
332 struct efi_register_notify_event {
333 struct list_head link;
334 struct efi_event *event;
336 struct list_head handles;
339 /* List of all events registered by RegisterProtocolNotify() */
340 extern struct list_head efi_register_notify_events;
342 /* Initialize efi execution environment */
343 efi_status_t efi_init_obj_list(void);
344 /* Run loaded UEFI image */
345 efi_status_t efi_run_image(void *source_buffer, efi_uintn_t source_size);
346 /* Initialize variable services */
347 efi_status_t efi_init_variables(void);
348 /* Notify ExitBootServices() is called */
349 void efi_variables_boot_exit_notify(void);
350 /* Called by bootefi to initialize root node */
351 efi_status_t efi_root_node_register(void);
352 /* Called by bootefi to initialize runtime */
353 efi_status_t efi_initialize_system_table(void);
354 /* efi_runtime_detach() - detach unimplemented runtime functions */
355 void efi_runtime_detach(void);
356 /* Called by bootefi to make console interface available */
357 efi_status_t efi_console_register(void);
358 /* Called by bootefi to make all disk storage accessible as EFI objects */
359 efi_status_t efi_disk_register(void);
360 /* Create handles and protocols for the partitions of a block device */
361 int efi_disk_create_partitions(efi_handle_t parent, struct blk_desc *desc,
362 const char *if_typename, int diskid,
363 const char *pdevname);
364 /* Called by bootefi to make GOP (graphical) interface available */
365 efi_status_t efi_gop_register(void);
366 /* Called by bootefi to make the network interface available */
367 efi_status_t efi_net_register(void);
368 /* Called by bootefi to make the watchdog available */
369 efi_status_t efi_watchdog_register(void);
370 /* Called by bootefi to make SMBIOS tables available */
372 * efi_acpi_register() - write out ACPI tables
374 * Called by bootefi to make ACPI tables available
376 * @return 0 if OK, -ENOMEM if no memory is available for the tables
378 efi_status_t efi_acpi_register(void);
380 * efi_smbios_register() - write out SMBIOS tables
382 * Called by bootefi to make SMBIOS tables available
384 * @return 0 if OK, -ENOMEM if no memory is available for the tables
386 efi_status_t efi_smbios_register(void);
388 struct efi_simple_file_system_protocol *
389 efi_fs_from_path(struct efi_device_path *fp);
391 /* Called by networking code to memorize the dhcp ack package */
392 void efi_net_set_dhcp_ack(void *pkt, int len);
393 /* Called by efi_set_watchdog_timer to reset the timer */
394 efi_status_t efi_set_watchdog(unsigned long timeout);
396 /* Called from places to check whether a timer expired */
397 void efi_timer_check(void);
398 /* PE loader implementation */
399 efi_status_t efi_load_pe(struct efi_loaded_image_obj *handle, void *efi,
400 struct efi_loaded_image *loaded_image_info);
401 /* Called once to store the pristine gd pointer */
402 void efi_save_gd(void);
403 /* Special case handler for error/abort that just tries to dtrt to get
404 * back to u-boot world */
405 void efi_restore_gd(void);
406 /* Call this to relocate the runtime section to an address space */
407 void efi_runtime_relocate(ulong offset, struct efi_mem_desc *map);
408 /* Call this to set the current device name */
409 void efi_set_bootdev(const char *dev, const char *devnr, const char *path);
410 /* Add a new object to the object list. */
411 void efi_add_handle(efi_handle_t obj);
413 efi_status_t efi_create_handle(efi_handle_t *handle);
415 void efi_delete_handle(efi_handle_t obj);
416 /* Call this to validate a handle and find the EFI object for it */
417 struct efi_object *efi_search_obj(const efi_handle_t handle);
419 efi_status_t EFIAPI efi_load_image(bool boot_policy,
420 efi_handle_t parent_image,
421 struct efi_device_path *file_path,
423 efi_uintn_t source_size,
424 efi_handle_t *image_handle);
426 efi_status_t EFIAPI efi_start_image(efi_handle_t image_handle,
427 efi_uintn_t *exit_data_size,
430 efi_status_t EFIAPI efi_unload_image(efi_handle_t image_handle);
431 /* Find a protocol on a handle */
432 efi_status_t efi_search_protocol(const efi_handle_t handle,
433 const efi_guid_t *protocol_guid,
434 struct efi_handler **handler);
435 /* Install new protocol on a handle */
436 efi_status_t efi_add_protocol(const efi_handle_t handle,
437 const efi_guid_t *protocol,
438 void *protocol_interface);
439 /* Delete protocol from a handle */
440 efi_status_t efi_remove_protocol(const efi_handle_t handle,
441 const efi_guid_t *protocol,
442 void *protocol_interface);
443 /* Delete all protocols from a handle */
444 efi_status_t efi_remove_all_protocols(const efi_handle_t handle);
445 /* Install multiple protocol interfaces */
446 efi_status_t EFIAPI efi_install_multiple_protocol_interfaces
447 (efi_handle_t *handle, ...);
448 /* Call this to create an event */
449 efi_status_t efi_create_event(uint32_t type, efi_uintn_t notify_tpl,
450 void (EFIAPI *notify_function) (
451 struct efi_event *event,
453 void *notify_context, efi_guid_t *group,
454 struct efi_event **event);
455 /* Call this to set a timer */
456 efi_status_t efi_set_timer(struct efi_event *event, enum efi_timer_delay type,
457 uint64_t trigger_time);
458 /* Call this to signal an event */
459 void efi_signal_event(struct efi_event *event);
461 /* open file system: */
462 struct efi_simple_file_system_protocol *efi_simple_file_system(
463 struct blk_desc *desc, int part, struct efi_device_path *dp);
465 /* open file from device-path: */
466 struct efi_file_handle *efi_file_from_path(struct efi_device_path *fp);
469 * efi_size_in_pages() - convert size in bytes to size in pages
471 * This macro returns the number of EFI memory pages required to hold 'size'
474 * @size: size in bytes
475 * Return: size in pages
477 #define efi_size_in_pages(size) ((size + EFI_PAGE_MASK) >> EFI_PAGE_SHIFT)
478 /* Generic EFI memory allocator, call this to get memory */
479 void *efi_alloc(uint64_t len, int memory_type);
480 /* More specific EFI memory allocator, called by EFI payloads */
481 efi_status_t efi_allocate_pages(int type, int memory_type, efi_uintn_t pages,
483 /* EFI memory free function. */
484 efi_status_t efi_free_pages(uint64_t memory, efi_uintn_t pages);
485 /* EFI memory allocator for small allocations */
486 efi_status_t efi_allocate_pool(int pool_type, efi_uintn_t size,
488 /* EFI pool memory free function. */
489 efi_status_t efi_free_pool(void *buffer);
490 /* Returns the EFI memory map */
491 efi_status_t efi_get_memory_map(efi_uintn_t *memory_map_size,
492 struct efi_mem_desc *memory_map,
493 efi_uintn_t *map_key,
494 efi_uintn_t *descriptor_size,
495 uint32_t *descriptor_version);
496 /* Adds a range into the EFI memory map */
497 efi_status_t efi_add_memory_map(uint64_t start, uint64_t pages, int memory_type,
498 bool overlap_only_ram);
499 /* Adds a conventional range into the EFI memory map */
500 efi_status_t efi_add_conventional_memory_map(u64 ram_start, u64 ram_end,
503 /* Called by board init to initialize the EFI drivers */
504 efi_status_t efi_driver_init(void);
505 /* Called by board init to initialize the EFI memory map */
506 int efi_memory_init(void);
507 /* Adds new or overrides configuration table entry to the system table */
508 efi_status_t efi_install_configuration_table(const efi_guid_t *guid, void *table);
509 /* Sets up a loaded image */
510 efi_status_t efi_setup_loaded_image(struct efi_device_path *device_path,
511 struct efi_device_path *file_path,
512 struct efi_loaded_image_obj **handle_ptr,
513 struct efi_loaded_image **info_ptr);
514 /* Print information about all loaded images */
515 void efi_print_image_infos(void *pc);
517 #ifdef CONFIG_EFI_LOADER_BOUNCE_BUFFER
518 extern void *efi_bounce_buffer;
519 #define EFI_LOADER_BOUNCE_BUFFER_SIZE (64 * 1024 * 1024)
523 struct efi_device_path *efi_dp_next(const struct efi_device_path *dp);
524 int efi_dp_match(const struct efi_device_path *a,
525 const struct efi_device_path *b);
526 struct efi_object *efi_dp_find_obj(struct efi_device_path *dp,
527 struct efi_device_path **rem);
528 /* get size of the first device path instance excluding end node */
529 efi_uintn_t efi_dp_instance_size(const struct efi_device_path *dp);
530 /* size of multi-instance device path excluding end node */
531 efi_uintn_t efi_dp_size(const struct efi_device_path *dp);
532 struct efi_device_path *efi_dp_dup(const struct efi_device_path *dp);
533 struct efi_device_path *efi_dp_append(const struct efi_device_path *dp1,
534 const struct efi_device_path *dp2);
535 struct efi_device_path *efi_dp_append_node(const struct efi_device_path *dp,
536 const struct efi_device_path *node);
537 /* Create a device path node of given type, sub-type, length */
538 struct efi_device_path *efi_dp_create_device_node(const u8 type,
541 /* Append device path instance */
542 struct efi_device_path *efi_dp_append_instance(
543 const struct efi_device_path *dp,
544 const struct efi_device_path *dpi);
545 /* Get next device path instance */
546 struct efi_device_path *efi_dp_get_next_instance(struct efi_device_path **dp,
548 /* Check if a device path contains muliple instances */
549 bool efi_dp_is_multi_instance(const struct efi_device_path *dp);
551 struct efi_device_path *efi_dp_from_part(struct blk_desc *desc, int part);
552 /* Create a device node for a block device partition. */
553 struct efi_device_path *efi_dp_part_node(struct blk_desc *desc, int part);
554 struct efi_device_path *efi_dp_from_file(struct blk_desc *desc, int part,
556 struct efi_device_path *efi_dp_from_eth(void);
557 struct efi_device_path *efi_dp_from_mem(uint32_t mem_type,
558 uint64_t start_address,
559 uint64_t end_address);
560 /* Determine the last device path node that is not the end node. */
561 const struct efi_device_path *efi_dp_last_node(
562 const struct efi_device_path *dp);
563 efi_status_t efi_dp_split_file_path(struct efi_device_path *full_path,
564 struct efi_device_path **device_path,
565 struct efi_device_path **file_path);
566 efi_status_t efi_dp_from_name(const char *dev, const char *devnr,
568 struct efi_device_path **device,
569 struct efi_device_path **file);
571 #define EFI_DP_TYPE(_dp, _type, _subtype) \
572 (((_dp)->type == DEVICE_PATH_TYPE_##_type) && \
573 ((_dp)->sub_type == DEVICE_PATH_SUB_TYPE_##_subtype))
576 * Use these to indicate that your code / data should go into the EFI runtime
577 * section and thus still be available when the OS is running
579 #define __efi_runtime_data __attribute__ ((section (".data.efi_runtime")))
580 #define __efi_runtime __attribute__ ((section (".text.efi_runtime")))
582 /* Indicate supported runtime services */
583 efi_status_t efi_init_runtime_supported(void);
585 /* Update CRC32 in table header */
586 void __efi_runtime efi_update_table_header_crc32(struct efi_table_hdr *table);
588 /* Call this with mmio_ptr as the _pointer_ to a pointer to an MMIO region
589 * to make it available at runtime */
590 efi_status_t efi_add_runtime_mmio(void *mmio_ptr, u64 len);
592 /* Boards may provide the functions below to implement RTS functionality */
594 void __efi_runtime EFIAPI efi_reset_system(
595 enum efi_reset_type reset_type,
596 efi_status_t reset_status,
597 unsigned long data_size, void *reset_data);
599 /* Architecture specific initialization of the EFI subsystem */
600 efi_status_t efi_reset_system_init(void);
602 efi_status_t __efi_runtime EFIAPI efi_get_time(
603 struct efi_time *time,
604 struct efi_time_cap *capabilities);
606 efi_status_t __efi_runtime EFIAPI efi_set_time(struct efi_time *time);
608 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
610 * Entry point for the tests of the EFI API.
611 * It is called by 'bootefi selftest'
613 efi_status_t EFIAPI efi_selftest(efi_handle_t image_handle,
614 struct efi_system_table *systab);
617 efi_status_t EFIAPI efi_get_variable(u16 *variable_name,
618 const efi_guid_t *vendor, u32 *attributes,
619 efi_uintn_t *data_size, void *data);
620 efi_status_t EFIAPI efi_get_next_variable_name(efi_uintn_t *variable_name_size,
622 const efi_guid_t *vendor);
623 efi_status_t EFIAPI efi_set_variable(u16 *variable_name,
624 const efi_guid_t *vendor, u32 attributes,
625 efi_uintn_t data_size, const void *data);
627 efi_status_t EFIAPI efi_query_variable_info(
628 u32 attributes, u64 *maximum_variable_storage_size,
629 u64 *remaining_variable_storage_size,
630 u64 *maximum_variable_size);
633 * See section 3.1.3 in the v2.7 UEFI spec for more details on
634 * the layout of EFI_LOAD_OPTION. In short it is:
636 * typedef struct _EFI_LOAD_OPTION {
638 * UINT16 FilePathListLength;
639 * // CHAR16 Description[]; <-- variable length, NULL terminated
640 * // EFI_DEVICE_PATH_PROTOCOL FilePathList[];
641 * <-- FilePathListLength bytes
642 * // UINT8 OptionalData[];
645 struct efi_load_option {
647 u16 file_path_length;
649 struct efi_device_path *file_path;
650 const u8 *optional_data;
653 void efi_deserialize_load_option(struct efi_load_option *lo, u8 *data);
654 unsigned long efi_serialize_load_option(struct efi_load_option *lo, u8 **data);
655 efi_status_t efi_bootmgr_load(efi_handle_t *handle);
657 #else /* CONFIG_IS_ENABLED(EFI_LOADER) */
659 /* Without CONFIG_EFI_LOADER we don't have a runtime section, stub it out */
660 #define __efi_runtime_data
661 #define __efi_runtime
662 static inline efi_status_t efi_add_runtime_mmio(void *mmio_ptr, u64 len)
667 /* No loader configured, stub out EFI_ENTRY */
668 static inline void efi_restore_gd(void) { }
669 static inline void efi_set_bootdev(const char *dev, const char *devnr,
670 const char *path) { }
671 static inline void efi_net_set_dhcp_ack(void *pkt, int len) { }
672 static inline void efi_print_image_infos(void *pc) { }
674 #endif /* CONFIG_IS_ENABLED(EFI_LOADER) */
676 #endif /* _EFI_LOADER_H */