2 * EFI application boot time services
4 * Copyright (c) 2016 Alexander Graf
6 * SPDX-License-Identifier: GPL-2.0+
11 #include <efi_loader.h>
12 #include <environment.h>
14 #include <asm/global_data.h>
15 #include <libfdt_env.h>
16 #include <u-boot/crc.h>
21 DECLARE_GLOBAL_DATA_PTR;
23 /* Task priority level */
24 static efi_uintn_t efi_tpl = TPL_APPLICATION;
26 /* This list contains all the EFI objects our payload has access to */
27 LIST_HEAD(efi_obj_list);
30 * If we're running on nasty systems (32bit ARM booting into non-EFI Linux)
31 * we need to do trickery with caches. Since we don't want to break the EFI
32 * aware boot path, only apply hacks when loading exiting directly (breaking
33 * direct Linux EFI booting along the way - oh well).
35 static bool efi_is_direct_boot = true;
38 * EFI can pass arbitrary additional "tables" containing vendor specific
39 * information to the payload. One such table is the FDT table which contains
40 * a pointer to a flattened device tree blob.
42 * In most cases we want to pass an FDT to the payload, so reserve one slot of
43 * config table space for it. The pointer gets populated by do_bootefi_exec().
45 static struct efi_configuration_table __efi_runtime_data efi_conf_table[2];
49 * The "gd" pointer lives in a register on ARM and AArch64 that we declare
50 * fixed when compiling U-Boot. However, the payload does not know about that
51 * restriction so we need to manually swap its and our view of that register on
52 * EFI callback entry/exit.
54 static volatile void *efi_gd, *app_gd;
57 static int entry_count;
58 static int nesting_level;
59 /* GUID of the EFI_DRIVER_BINDING_PROTOCOL */
60 const efi_guid_t efi_guid_driver_binding_protocol =
61 EFI_DRIVER_BINDING_PROTOCOL_GUID;
63 static efi_status_t EFIAPI efi_disconnect_controller(
64 efi_handle_t controller_handle,
65 efi_handle_t driver_image_handle,
66 efi_handle_t child_handle);
68 /* Called on every callback entry */
69 int __efi_entry_check(void)
71 int ret = entry_count++ == 0;
80 /* Called on every callback exit */
81 int __efi_exit_check(void)
83 int ret = --entry_count == 0;
90 /* Called from do_bootefi_exec() */
91 void efi_save_gd(void)
99 * Special case handler for error/abort that just forces things back
100 * to u-boot world so we can dump out an abort msg, without any care
101 * about returning back to UEFI world.
103 void efi_restore_gd(void)
106 /* Only restore if we're already in EFI context */
114 * Two spaces per indent level, maxing out at 10.. which ought to be
115 * enough for anyone ;-)
117 static const char *indent_string(int level)
119 const char *indent = " ";
120 const int max = strlen(indent);
121 level = min(max, level * 2);
122 return &indent[max - level];
125 const char *__efi_nesting(void)
127 return indent_string(nesting_level);
130 const char *__efi_nesting_inc(void)
132 return indent_string(nesting_level++);
135 const char *__efi_nesting_dec(void)
137 return indent_string(--nesting_level);
141 * Queue an EFI event.
143 * This function queues the notification function of the event for future
146 * The notification function is called if the task priority level of the
147 * event is higher than the current task priority level.
149 * For the SignalEvent service see efi_signal_event_ext.
151 * @event event to signal
152 * @check_tpl check the TPL level
154 void efi_signal_event(struct efi_event *event, bool check_tpl)
156 if (event->notify_function) {
157 event->is_queued = true;
159 if (check_tpl && efi_tpl >= event->notify_tpl)
161 EFI_CALL_VOID(event->notify_function(event,
162 event->notify_context));
164 event->is_queued = false;
168 * Raise the task priority level.
170 * This function implements the RaiseTpl service.
171 * See the Unified Extensible Firmware Interface (UEFI) specification
174 * @new_tpl new value of the task priority level
175 * @return old value of the task priority level
177 static unsigned long EFIAPI efi_raise_tpl(efi_uintn_t new_tpl)
179 efi_uintn_t old_tpl = efi_tpl;
181 EFI_ENTRY("0x%zx", new_tpl);
183 if (new_tpl < efi_tpl)
184 debug("WARNING: new_tpl < current_tpl in %s\n", __func__);
186 if (efi_tpl > TPL_HIGH_LEVEL)
187 efi_tpl = TPL_HIGH_LEVEL;
189 EFI_EXIT(EFI_SUCCESS);
194 * Lower the task priority level.
196 * This function implements the RestoreTpl service.
197 * See the Unified Extensible Firmware Interface (UEFI) specification
200 * @old_tpl value of the task priority level to be restored
202 static void EFIAPI efi_restore_tpl(efi_uintn_t old_tpl)
204 EFI_ENTRY("0x%zx", old_tpl);
206 if (old_tpl > efi_tpl)
207 debug("WARNING: old_tpl > current_tpl in %s\n", __func__);
209 if (efi_tpl > TPL_HIGH_LEVEL)
210 efi_tpl = TPL_HIGH_LEVEL;
212 EFI_EXIT(EFI_SUCCESS);
216 * Allocate memory pages.
218 * This function implements the AllocatePages service.
219 * See the Unified Extensible Firmware Interface (UEFI) specification
222 * @type type of allocation to be performed
223 * @memory_type usage type of the allocated memory
224 * @pages number of pages to be allocated
225 * @memory allocated memory
226 * @return status code
228 static efi_status_t EFIAPI efi_allocate_pages_ext(int type, int memory_type,
234 EFI_ENTRY("%d, %d, 0x%zx, %p", type, memory_type, pages, memory);
235 r = efi_allocate_pages(type, memory_type, pages, memory);
242 * This function implements the FreePages service.
243 * See the Unified Extensible Firmware Interface (UEFI) specification
246 * @memory start of the memory area to be freed
247 * @pages number of pages to be freed
248 * @return status code
250 static efi_status_t EFIAPI efi_free_pages_ext(uint64_t memory,
255 EFI_ENTRY("%"PRIx64", 0x%zx", memory, pages);
256 r = efi_free_pages(memory, pages);
261 * Get map describing memory usage.
263 * This function implements the GetMemoryMap service.
264 * See the Unified Extensible Firmware Interface (UEFI) specification
267 * @memory_map_size on entry the size, in bytes, of the memory map buffer,
268 * on exit the size of the copied memory map
269 * @memory_map buffer to which the memory map is written
270 * @map_key key for the memory map
271 * @descriptor_size size of an individual memory descriptor
272 * @descriptor_version version number of the memory descriptor structure
273 * @return status code
275 static efi_status_t EFIAPI efi_get_memory_map_ext(
276 efi_uintn_t *memory_map_size,
277 struct efi_mem_desc *memory_map,
278 efi_uintn_t *map_key,
279 efi_uintn_t *descriptor_size,
280 uint32_t *descriptor_version)
284 EFI_ENTRY("%p, %p, %p, %p, %p", memory_map_size, memory_map,
285 map_key, descriptor_size, descriptor_version);
286 r = efi_get_memory_map(memory_map_size, memory_map, map_key,
287 descriptor_size, descriptor_version);
292 * Allocate memory from pool.
294 * This function implements the AllocatePool service.
295 * See the Unified Extensible Firmware Interface (UEFI) specification
298 * @pool_type type of the pool from which memory is to be allocated
299 * @size number of bytes to be allocated
300 * @buffer allocated memory
301 * @return status code
303 static efi_status_t EFIAPI efi_allocate_pool_ext(int pool_type,
309 EFI_ENTRY("%d, %zd, %p", pool_type, size, buffer);
310 r = efi_allocate_pool(pool_type, size, buffer);
315 * Free memory from pool.
317 * This function implements the FreePool service.
318 * See the Unified Extensible Firmware Interface (UEFI) specification
321 * @buffer start of memory to be freed
322 * @return status code
324 static efi_status_t EFIAPI efi_free_pool_ext(void *buffer)
328 EFI_ENTRY("%p", buffer);
329 r = efi_free_pool(buffer);
334 * Add a new object to the object list.
336 * The protocols list is initialized.
337 * The object handle is set.
339 * @obj object to be added
341 void efi_add_handle(struct efi_object *obj)
345 INIT_LIST_HEAD(&obj->protocols);
347 list_add_tail(&obj->link, &efi_obj_list);
354 * @return status code
356 efi_status_t efi_create_handle(efi_handle_t *handle)
358 struct efi_object *obj;
361 r = efi_allocate_pool(EFI_ALLOCATE_ANY_PAGES,
362 sizeof(struct efi_object),
364 if (r != EFI_SUCCESS)
367 *handle = obj->handle;
372 * Find a protocol on a handle.
375 * @protocol_guid GUID of the protocol
376 * @handler reference to the protocol
377 * @return status code
379 efi_status_t efi_search_protocol(const efi_handle_t handle,
380 const efi_guid_t *protocol_guid,
381 struct efi_handler **handler)
383 struct efi_object *efiobj;
384 struct list_head *lhandle;
386 if (!handle || !protocol_guid)
387 return EFI_INVALID_PARAMETER;
388 efiobj = efi_search_obj(handle);
390 return EFI_INVALID_PARAMETER;
391 list_for_each(lhandle, &efiobj->protocols) {
392 struct efi_handler *protocol;
394 protocol = list_entry(lhandle, struct efi_handler, link);
395 if (!guidcmp(protocol->guid, protocol_guid)) {
401 return EFI_NOT_FOUND;
405 * Delete protocol from a handle.
407 * @handle handle from which the protocol shall be deleted
408 * @protocol GUID of the protocol to be deleted
409 * @protocol_interface interface of the protocol implementation
410 * @return status code
412 efi_status_t efi_remove_protocol(const efi_handle_t handle,
413 const efi_guid_t *protocol,
414 void *protocol_interface)
416 struct efi_handler *handler;
419 ret = efi_search_protocol(handle, protocol, &handler);
420 if (ret != EFI_SUCCESS)
422 if (guidcmp(handler->guid, protocol))
423 return EFI_INVALID_PARAMETER;
424 list_del(&handler->link);
430 * Delete all protocols from a handle.
432 * @handle handle from which the protocols shall be deleted
433 * @return status code
435 efi_status_t efi_remove_all_protocols(const efi_handle_t handle)
437 struct efi_object *efiobj;
438 struct efi_handler *protocol;
439 struct efi_handler *pos;
441 efiobj = efi_search_obj(handle);
443 return EFI_INVALID_PARAMETER;
444 list_for_each_entry_safe(protocol, pos, &efiobj->protocols, link) {
447 ret = efi_remove_protocol(handle, protocol->guid,
448 protocol->protocol_interface);
449 if (ret != EFI_SUCCESS)
458 * @handle handle to delete
460 void efi_delete_handle(struct efi_object *obj)
464 efi_remove_all_protocols(obj->handle);
465 list_del(&obj->link);
470 * Our event capabilities are very limited. Only a small limited
471 * number of events is allowed to coexist.
473 static struct efi_event efi_events[16];
478 * This function is used inside U-Boot code to create an event.
480 * For the API function implementing the CreateEvent service see
481 * efi_create_event_ext.
483 * @type type of the event to create
484 * @notify_tpl task priority level of the event
485 * @notify_function notification function of the event
486 * @notify_context pointer passed to the notification function
487 * @event created event
488 * @return status code
490 efi_status_t efi_create_event(uint32_t type, efi_uintn_t notify_tpl,
491 void (EFIAPI *notify_function) (
492 struct efi_event *event,
494 void *notify_context, struct efi_event **event)
499 return EFI_INVALID_PARAMETER;
501 if ((type & EVT_NOTIFY_SIGNAL) && (type & EVT_NOTIFY_WAIT))
502 return EFI_INVALID_PARAMETER;
504 if ((type & (EVT_NOTIFY_SIGNAL|EVT_NOTIFY_WAIT)) &&
505 notify_function == NULL)
506 return EFI_INVALID_PARAMETER;
508 for (i = 0; i < ARRAY_SIZE(efi_events); ++i) {
509 if (efi_events[i].type)
511 efi_events[i].type = type;
512 efi_events[i].notify_tpl = notify_tpl;
513 efi_events[i].notify_function = notify_function;
514 efi_events[i].notify_context = notify_context;
515 /* Disable timers on bootup */
516 efi_events[i].trigger_next = -1ULL;
517 efi_events[i].is_queued = false;
518 efi_events[i].is_signaled = false;
519 *event = &efi_events[i];
522 return EFI_OUT_OF_RESOURCES;
528 * This function implements the CreateEvent service.
529 * See the Unified Extensible Firmware Interface (UEFI) specification
532 * @type type of the event to create
533 * @notify_tpl task priority level of the event
534 * @notify_function notification function of the event
535 * @notify_context pointer passed to the notification function
536 * @event created event
537 * @return status code
539 static efi_status_t EFIAPI efi_create_event_ext(
540 uint32_t type, efi_uintn_t notify_tpl,
541 void (EFIAPI *notify_function) (
542 struct efi_event *event,
544 void *notify_context, struct efi_event **event)
546 EFI_ENTRY("%d, 0x%zx, %p, %p", type, notify_tpl, notify_function,
548 return EFI_EXIT(efi_create_event(type, notify_tpl, notify_function,
549 notify_context, event));
554 * Check if a timer event has occurred or a queued notification function should
557 * Our timers have to work without interrupts, so we check whenever keyboard
558 * input or disk accesses happen if enough time elapsed for them to fire.
560 void efi_timer_check(void)
563 u64 now = timer_get_us();
565 for (i = 0; i < ARRAY_SIZE(efi_events); ++i) {
566 if (!efi_events[i].type)
568 if (efi_events[i].is_queued)
569 efi_signal_event(&efi_events[i], true);
570 if (!(efi_events[i].type & EVT_TIMER) ||
571 now < efi_events[i].trigger_next)
573 switch (efi_events[i].trigger_type) {
574 case EFI_TIMER_RELATIVE:
575 efi_events[i].trigger_type = EFI_TIMER_STOP;
577 case EFI_TIMER_PERIODIC:
578 efi_events[i].trigger_next +=
579 efi_events[i].trigger_time;
584 efi_events[i].is_signaled = true;
585 efi_signal_event(&efi_events[i], true);
591 * Set the trigger time for a timer event or stop the event.
593 * This is the function for internal usage in U-Boot. For the API function
594 * implementing the SetTimer service see efi_set_timer_ext.
596 * @event event for which the timer is set
597 * @type type of the timer
598 * @trigger_time trigger period in multiples of 100ns
599 * @return status code
601 efi_status_t efi_set_timer(struct efi_event *event, enum efi_timer_delay type,
602 uint64_t trigger_time)
607 * The parameter defines a multiple of 100ns.
608 * We use multiples of 1000ns. So divide by 10.
610 do_div(trigger_time, 10);
612 for (i = 0; i < ARRAY_SIZE(efi_events); ++i) {
613 if (event != &efi_events[i])
616 if (!(event->type & EVT_TIMER))
620 event->trigger_next = -1ULL;
622 case EFI_TIMER_PERIODIC:
623 case EFI_TIMER_RELATIVE:
624 event->trigger_next =
625 timer_get_us() + trigger_time;
628 return EFI_INVALID_PARAMETER;
630 event->trigger_type = type;
631 event->trigger_time = trigger_time;
632 event->is_signaled = false;
635 return EFI_INVALID_PARAMETER;
639 * Set the trigger time for a timer event or stop the event.
641 * This function implements the SetTimer service.
642 * See the Unified Extensible Firmware Interface (UEFI) specification
645 * @event event for which the timer is set
646 * @type type of the timer
647 * @trigger_time trigger period in multiples of 100ns
648 * @return status code
650 static efi_status_t EFIAPI efi_set_timer_ext(struct efi_event *event,
651 enum efi_timer_delay type,
652 uint64_t trigger_time)
654 EFI_ENTRY("%p, %d, %"PRIx64, event, type, trigger_time);
655 return EFI_EXIT(efi_set_timer(event, type, trigger_time));
659 * Wait for events to be signaled.
661 * This function implements the WaitForEvent service.
662 * See the Unified Extensible Firmware Interface (UEFI) specification
665 * @num_events number of events to be waited for
666 * @events events to be waited for
667 * @index index of the event that was signaled
668 * @return status code
670 static efi_status_t EFIAPI efi_wait_for_event(efi_uintn_t num_events,
671 struct efi_event **event,
676 EFI_ENTRY("%zd, %p, %p", num_events, event, index);
678 /* Check parameters */
679 if (!num_events || !event)
680 return EFI_EXIT(EFI_INVALID_PARAMETER);
682 if (efi_tpl != TPL_APPLICATION)
683 return EFI_EXIT(EFI_UNSUPPORTED);
684 for (i = 0; i < num_events; ++i) {
685 for (j = 0; j < ARRAY_SIZE(efi_events); ++j) {
686 if (event[i] == &efi_events[j])
689 return EFI_EXIT(EFI_INVALID_PARAMETER);
691 if (!event[i]->type || event[i]->type & EVT_NOTIFY_SIGNAL)
692 return EFI_EXIT(EFI_INVALID_PARAMETER);
693 if (!event[i]->is_signaled)
694 efi_signal_event(event[i], true);
697 /* Wait for signal */
699 for (i = 0; i < num_events; ++i) {
700 if (event[i]->is_signaled)
703 /* Allow events to occur. */
709 * Reset the signal which is passed to the caller to allow periodic
712 event[i]->is_signaled = false;
716 return EFI_EXIT(EFI_SUCCESS);
720 * Signal an EFI event.
722 * This function implements the SignalEvent service.
723 * See the Unified Extensible Firmware Interface (UEFI) specification
726 * This functions sets the signaled state of the event and queues the
727 * notification function for execution.
729 * @event event to signal
730 * @return status code
732 static efi_status_t EFIAPI efi_signal_event_ext(struct efi_event *event)
736 EFI_ENTRY("%p", event);
737 for (i = 0; i < ARRAY_SIZE(efi_events); ++i) {
738 if (event != &efi_events[i])
740 if (event->is_signaled)
742 event->is_signaled = true;
743 if (event->type & EVT_NOTIFY_SIGNAL)
744 efi_signal_event(event, true);
747 return EFI_EXIT(EFI_SUCCESS);
751 * Close an EFI event.
753 * This function implements the CloseEvent service.
754 * See the Unified Extensible Firmware Interface (UEFI) specification
757 * @event event to close
758 * @return status code
760 static efi_status_t EFIAPI efi_close_event(struct efi_event *event)
764 EFI_ENTRY("%p", event);
765 for (i = 0; i < ARRAY_SIZE(efi_events); ++i) {
766 if (event == &efi_events[i]) {
768 event->trigger_next = -1ULL;
769 event->is_queued = false;
770 event->is_signaled = false;
771 return EFI_EXIT(EFI_SUCCESS);
774 return EFI_EXIT(EFI_INVALID_PARAMETER);
778 * Check if an event is signaled.
780 * This function implements the CheckEvent service.
781 * See the Unified Extensible Firmware Interface (UEFI) specification
784 * If an event is not signaled yet the notification function is queued.
786 * @event event to check
787 * @return status code
789 static efi_status_t EFIAPI efi_check_event(struct efi_event *event)
793 EFI_ENTRY("%p", event);
795 for (i = 0; i < ARRAY_SIZE(efi_events); ++i) {
796 if (event != &efi_events[i])
798 if (!event->type || event->type & EVT_NOTIFY_SIGNAL)
800 if (!event->is_signaled)
801 efi_signal_event(event, true);
802 if (event->is_signaled)
803 return EFI_EXIT(EFI_SUCCESS);
804 return EFI_EXIT(EFI_NOT_READY);
806 return EFI_EXIT(EFI_INVALID_PARAMETER);
810 * Find the internal EFI object for a handle.
812 * @handle handle to find
815 struct efi_object *efi_search_obj(const efi_handle_t handle)
817 struct efi_object *efiobj;
819 list_for_each_entry(efiobj, &efi_obj_list, link) {
820 if (efiobj->handle == handle)
828 * Create open protocol info entry and add it to a protocol.
830 * @handler handler of a protocol
831 * @return open protocol info entry
833 static struct efi_open_protocol_info_entry *efi_create_open_info(
834 struct efi_handler *handler)
836 struct efi_open_protocol_info_item *item;
838 item = calloc(1, sizeof(struct efi_open_protocol_info_item));
841 /* Append the item to the open protocol info list. */
842 list_add_tail(&item->link, &handler->open_infos);
848 * Remove an open protocol info entry from a protocol.
850 * @handler handler of a protocol
851 * @return status code
853 static efi_status_t efi_delete_open_info(
854 struct efi_open_protocol_info_item *item)
856 list_del(&item->link);
862 * Install new protocol on a handle.
864 * @handle handle on which the protocol shall be installed
865 * @protocol GUID of the protocol to be installed
866 * @protocol_interface interface of the protocol implementation
867 * @return status code
869 efi_status_t efi_add_protocol(const efi_handle_t handle,
870 const efi_guid_t *protocol,
871 void *protocol_interface)
873 struct efi_object *efiobj;
874 struct efi_handler *handler;
877 efiobj = efi_search_obj(handle);
879 return EFI_INVALID_PARAMETER;
880 ret = efi_search_protocol(handle, protocol, NULL);
881 if (ret != EFI_NOT_FOUND)
882 return EFI_INVALID_PARAMETER;
883 handler = calloc(1, sizeof(struct efi_handler));
885 return EFI_OUT_OF_RESOURCES;
886 handler->guid = protocol;
887 handler->protocol_interface = protocol_interface;
888 INIT_LIST_HEAD(&handler->open_infos);
889 list_add_tail(&handler->link, &efiobj->protocols);
890 if (!guidcmp(&efi_guid_device_path, protocol))
891 EFI_PRINT("installed device path '%pD'\n", protocol_interface);
896 * Install protocol interface.
898 * This function implements the InstallProtocolInterface service.
899 * See the Unified Extensible Firmware Interface (UEFI) specification
902 * @handle handle on which the protocol shall be installed
903 * @protocol GUID of the protocol to be installed
904 * @protocol_interface_type type of the interface to be installed,
905 * always EFI_NATIVE_INTERFACE
906 * @protocol_interface interface of the protocol implementation
907 * @return status code
909 static efi_status_t EFIAPI efi_install_protocol_interface(
910 void **handle, const efi_guid_t *protocol,
911 int protocol_interface_type, void *protocol_interface)
915 EFI_ENTRY("%p, %pUl, %d, %p", handle, protocol, protocol_interface_type,
918 if (!handle || !protocol ||
919 protocol_interface_type != EFI_NATIVE_INTERFACE) {
920 r = EFI_INVALID_PARAMETER;
924 /* Create new handle if requested. */
926 r = efi_create_handle(handle);
927 if (r != EFI_SUCCESS)
929 debug("%sEFI: new handle %p\n", indent_string(nesting_level),
932 debug("%sEFI: handle %p\n", indent_string(nesting_level),
935 /* Add new protocol */
936 r = efi_add_protocol(*handle, protocol, protocol_interface);
942 * Reinstall protocol interface.
944 * This function implements the ReinstallProtocolInterface service.
945 * See the Unified Extensible Firmware Interface (UEFI) specification
948 * @handle handle on which the protocol shall be
950 * @protocol GUID of the protocol to be installed
951 * @old_interface interface to be removed
952 * @new_interface interface to be installed
953 * @return status code
955 static efi_status_t EFIAPI efi_reinstall_protocol_interface(
956 efi_handle_t handle, const efi_guid_t *protocol,
957 void *old_interface, void *new_interface)
959 EFI_ENTRY("%p, %pUl, %p, %p", handle, protocol, old_interface,
961 return EFI_EXIT(EFI_ACCESS_DENIED);
965 * Get all drivers associated to a controller.
966 * The allocated buffer has to be freed with free().
968 * @efiobj handle of the controller
969 * @protocol protocol guid (optional)
970 * @number_of_drivers number of child controllers
971 * @driver_handle_buffer handles of the the drivers
972 * @return status code
974 static efi_status_t efi_get_drivers(struct efi_object *efiobj,
975 const efi_guid_t *protocol,
976 efi_uintn_t *number_of_drivers,
977 efi_handle_t **driver_handle_buffer)
979 struct efi_handler *handler;
980 struct efi_open_protocol_info_item *item;
981 efi_uintn_t count = 0, i;
984 /* Count all driver associations */
985 list_for_each_entry(handler, &efiobj->protocols, link) {
986 if (protocol && guidcmp(handler->guid, protocol))
988 list_for_each_entry(item, &handler->open_infos, link) {
989 if (item->info.attributes &
990 EFI_OPEN_PROTOCOL_BY_DRIVER)
995 * Create buffer. In case of duplicate driver assignments the buffer
996 * will be too large. But that does not harm.
998 *number_of_drivers = 0;
999 *driver_handle_buffer = calloc(count, sizeof(efi_handle_t));
1000 if (!*driver_handle_buffer)
1001 return EFI_OUT_OF_RESOURCES;
1002 /* Collect unique driver handles */
1003 list_for_each_entry(handler, &efiobj->protocols, link) {
1004 if (protocol && guidcmp(handler->guid, protocol))
1006 list_for_each_entry(item, &handler->open_infos, link) {
1007 if (item->info.attributes &
1008 EFI_OPEN_PROTOCOL_BY_DRIVER) {
1009 /* Check this is a new driver */
1011 for (i = 0; i < *number_of_drivers; ++i) {
1012 if ((*driver_handle_buffer)[i] ==
1013 item->info.agent_handle)
1016 /* Copy handle to buffer */
1018 i = (*number_of_drivers)++;
1019 (*driver_handle_buffer)[i] =
1020 item->info.agent_handle;
1029 * Disconnect all drivers from a controller.
1031 * This function implements the DisconnectController service.
1032 * See the Unified Extensible Firmware Interface (UEFI) specification
1035 * @efiobj handle of the controller
1036 * @protocol protocol guid (optional)
1037 * @child_handle handle of the child to destroy
1038 * @return status code
1040 static efi_status_t efi_disconnect_all_drivers(
1041 struct efi_object *efiobj,
1042 const efi_guid_t *protocol,
1043 efi_handle_t child_handle)
1045 efi_uintn_t number_of_drivers;
1046 efi_handle_t *driver_handle_buffer;
1047 efi_status_t r, ret;
1049 ret = efi_get_drivers(efiobj, protocol, &number_of_drivers,
1050 &driver_handle_buffer);
1051 if (ret != EFI_SUCCESS)
1054 ret = EFI_NOT_FOUND;
1055 while (number_of_drivers) {
1056 r = EFI_CALL(efi_disconnect_controller(
1058 driver_handle_buffer[--number_of_drivers],
1060 if (r == EFI_SUCCESS)
1063 free(driver_handle_buffer);
1068 * Uninstall protocol interface.
1070 * This function implements the UninstallProtocolInterface service.
1071 * See the Unified Extensible Firmware Interface (UEFI) specification
1074 * @handle handle from which the protocol shall be removed
1075 * @protocol GUID of the protocol to be removed
1076 * @protocol_interface interface to be removed
1077 * @return status code
1079 static efi_status_t EFIAPI efi_uninstall_protocol_interface(
1080 efi_handle_t handle, const efi_guid_t *protocol,
1081 void *protocol_interface)
1083 struct efi_object *efiobj;
1084 struct efi_handler *handler;
1085 struct efi_open_protocol_info_item *item;
1086 struct efi_open_protocol_info_item *pos;
1089 EFI_ENTRY("%p, %pUl, %p", handle, protocol, protocol_interface);
1092 efiobj = efi_search_obj(handle);
1094 r = EFI_INVALID_PARAMETER;
1097 /* Find the protocol on the handle */
1098 r = efi_search_protocol(handle, protocol, &handler);
1099 if (r != EFI_SUCCESS)
1101 /* Disconnect controllers */
1102 efi_disconnect_all_drivers(efiobj, protocol, NULL);
1103 if (!list_empty(&handler->open_infos)) {
1104 r = EFI_ACCESS_DENIED;
1107 /* Close protocol */
1108 list_for_each_entry_safe(item, pos, &handler->open_infos, link) {
1109 if (item->info.attributes ==
1110 EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL ||
1111 item->info.attributes == EFI_OPEN_PROTOCOL_GET_PROTOCOL ||
1112 item->info.attributes == EFI_OPEN_PROTOCOL_TEST_PROTOCOL)
1113 list_del(&item->link);
1115 if (!list_empty(&handler->open_infos)) {
1116 r = EFI_ACCESS_DENIED;
1119 r = efi_remove_protocol(handle, protocol, protocol_interface);
1125 * Register an event for notification when a protocol is installed.
1127 * This function implements the RegisterProtocolNotify service.
1128 * See the Unified Extensible Firmware Interface (UEFI) specification
1131 * @protocol GUID of the protocol whose installation shall be
1133 * @event event to be signaled upon installation of the protocol
1134 * @registration key for retrieving the registration information
1135 * @return status code
1137 static efi_status_t EFIAPI efi_register_protocol_notify(
1138 const efi_guid_t *protocol,
1139 struct efi_event *event,
1140 void **registration)
1142 EFI_ENTRY("%pUl, %p, %p", protocol, event, registration);
1143 return EFI_EXIT(EFI_OUT_OF_RESOURCES);
1147 * Determine if an EFI handle implements a protocol.
1149 * See the documentation of the LocateHandle service in the UEFI specification.
1151 * @search_type selection criterion
1152 * @protocol GUID of the protocol
1153 * @search_key registration key
1155 * @return 0 if the handle implements the protocol
1157 static int efi_search(enum efi_locate_search_type search_type,
1158 const efi_guid_t *protocol, void *search_key,
1159 struct efi_object *efiobj)
1163 switch (search_type) {
1166 case BY_REGISTER_NOTIFY:
1167 /* TODO: RegisterProtocolNotify is not implemented yet */
1170 ret = efi_search_protocol(efiobj->handle, protocol, NULL);
1171 return (ret != EFI_SUCCESS);
1173 /* Invalid search type */
1179 * Locate handles implementing a protocol.
1181 * This function is meant for U-Boot internal calls. For the API implementation
1182 * of the LocateHandle service see efi_locate_handle_ext.
1184 * @search_type selection criterion
1185 * @protocol GUID of the protocol
1186 * @search_key registration key
1187 * @buffer_size size of the buffer to receive the handles in bytes
1188 * @buffer buffer to receive the relevant handles
1189 * @return status code
1191 static efi_status_t efi_locate_handle(
1192 enum efi_locate_search_type search_type,
1193 const efi_guid_t *protocol, void *search_key,
1194 efi_uintn_t *buffer_size, efi_handle_t *buffer)
1196 struct efi_object *efiobj;
1197 efi_uintn_t size = 0;
1199 /* Check parameters */
1200 switch (search_type) {
1203 case BY_REGISTER_NOTIFY:
1205 return EFI_INVALID_PARAMETER;
1206 /* RegisterProtocolNotify is not implemented yet */
1207 return EFI_UNSUPPORTED;
1210 return EFI_INVALID_PARAMETER;
1213 return EFI_INVALID_PARAMETER;
1217 * efi_locate_handle_buffer uses this function for
1218 * the calculation of the necessary buffer size.
1219 * So do not require a buffer for buffersize == 0.
1221 if (!buffer_size || (*buffer_size && !buffer))
1222 return EFI_INVALID_PARAMETER;
1224 /* Count how much space we need */
1225 list_for_each_entry(efiobj, &efi_obj_list, link) {
1226 if (!efi_search(search_type, protocol, search_key, efiobj))
1227 size += sizeof(void*);
1230 if (*buffer_size < size) {
1231 *buffer_size = size;
1232 return EFI_BUFFER_TOO_SMALL;
1235 *buffer_size = size;
1237 return EFI_NOT_FOUND;
1239 /* Then fill the array */
1240 list_for_each_entry(efiobj, &efi_obj_list, link) {
1241 if (!efi_search(search_type, protocol, search_key, efiobj))
1242 *buffer++ = efiobj->handle;
1249 * Locate handles implementing a protocol.
1251 * This function implements the LocateHandle service.
1252 * See the Unified Extensible Firmware Interface (UEFI) specification
1255 * @search_type selection criterion
1256 * @protocol GUID of the protocol
1257 * @search_key registration key
1258 * @buffer_size size of the buffer to receive the handles in bytes
1259 * @buffer buffer to receive the relevant handles
1260 * @return 0 if the handle implements the protocol
1262 static efi_status_t EFIAPI efi_locate_handle_ext(
1263 enum efi_locate_search_type search_type,
1264 const efi_guid_t *protocol, void *search_key,
1265 efi_uintn_t *buffer_size, efi_handle_t *buffer)
1267 EFI_ENTRY("%d, %pUl, %p, %p, %p", search_type, protocol, search_key,
1268 buffer_size, buffer);
1270 return EFI_EXIT(efi_locate_handle(search_type, protocol, search_key,
1271 buffer_size, buffer));
1274 /* Collapses configuration table entries, removing index i */
1275 static void efi_remove_configuration_table(int i)
1277 struct efi_configuration_table *this = &efi_conf_table[i];
1278 struct efi_configuration_table *next = &efi_conf_table[i+1];
1279 struct efi_configuration_table *end = &efi_conf_table[systab.nr_tables];
1281 memmove(this, next, (ulong)end - (ulong)next);
1286 * Adds, updates, or removes a configuration table.
1288 * This function is used for internal calls. For the API implementation of the
1289 * InstallConfigurationTable service see efi_install_configuration_table_ext.
1291 * @guid GUID of the installed table
1292 * @table table to be installed
1293 * @return status code
1295 efi_status_t efi_install_configuration_table(const efi_guid_t *guid, void *table)
1299 /* Check for guid override */
1300 for (i = 0; i < systab.nr_tables; i++) {
1301 if (!guidcmp(guid, &efi_conf_table[i].guid)) {
1303 efi_conf_table[i].table = table;
1305 efi_remove_configuration_table(i);
1311 return EFI_NOT_FOUND;
1313 /* No override, check for overflow */
1314 if (i >= ARRAY_SIZE(efi_conf_table))
1315 return EFI_OUT_OF_RESOURCES;
1317 /* Add a new entry */
1318 memcpy(&efi_conf_table[i].guid, guid, sizeof(*guid));
1319 efi_conf_table[i].table = table;
1320 systab.nr_tables = i + 1;
1326 * Adds, updates, or removes a configuration table.
1328 * This function implements the InstallConfigurationTable service.
1329 * See the Unified Extensible Firmware Interface (UEFI) specification
1332 * @guid GUID of the installed table
1333 * @table table to be installed
1334 * @return status code
1336 static efi_status_t EFIAPI efi_install_configuration_table_ext(efi_guid_t *guid,
1339 EFI_ENTRY("%pUl, %p", guid, table);
1340 return EFI_EXIT(efi_install_configuration_table(guid, table));
1344 * Initialize a loaded_image_info + loaded_image_info object with correct
1345 * protocols, boot-device, etc.
1347 * @info loaded image info to be passed to the entry point of the
1349 * @obj internal object associated with the loaded image
1350 * @device_path device path of the loaded image
1351 * @file_path file path of the loaded image
1352 * @return status code
1354 efi_status_t efi_setup_loaded_image(
1355 struct efi_loaded_image *info, struct efi_object *obj,
1356 struct efi_device_path *device_path,
1357 struct efi_device_path *file_path)
1361 /* Add internal object to object list */
1362 efi_add_handle(obj);
1363 /* efi_exit() assumes that the handle points to the info */
1366 info->file_path = file_path;
1368 info->device_handle = efi_dp_find_obj(device_path, NULL);
1371 * When asking for the device path interface, return
1372 * bootefi_device_path
1374 ret = efi_add_protocol(obj->handle, &efi_guid_device_path, device_path);
1375 if (ret != EFI_SUCCESS)
1379 * When asking for the loaded_image interface, just
1380 * return handle which points to loaded_image_info
1382 ret = efi_add_protocol(obj->handle, &efi_guid_loaded_image, info);
1383 if (ret != EFI_SUCCESS)
1386 ret = efi_add_protocol(obj->handle, &efi_guid_console_control,
1387 (void *)&efi_console_control);
1388 if (ret != EFI_SUCCESS)
1391 ret = efi_add_protocol(obj->handle,
1392 &efi_guid_device_path_to_text_protocol,
1393 (void *)&efi_device_path_to_text);
1394 if (ret != EFI_SUCCESS)
1399 printf("ERROR: Failure to install protocols for loaded image\n");
1404 * Load an image using a file path.
1406 * @file_path the path of the image to load
1407 * @buffer buffer containing the loaded image
1408 * @return status code
1410 efi_status_t efi_load_image_from_path(struct efi_device_path *file_path,
1413 struct efi_file_info *info = NULL;
1414 struct efi_file_handle *f;
1415 static efi_status_t ret;
1418 f = efi_file_from_path(file_path);
1420 return EFI_DEVICE_ERROR;
1423 EFI_CALL(ret = f->getinfo(f, (efi_guid_t *)&efi_file_info_guid,
1425 if (ret == EFI_BUFFER_TOO_SMALL) {
1427 EFI_CALL(ret = f->getinfo(f, (efi_guid_t *)&efi_file_info_guid,
1430 if (ret != EFI_SUCCESS)
1433 ret = efi_allocate_pool(EFI_LOADER_DATA, info->file_size, buffer);
1437 EFI_CALL(ret = f->read(f, &info->file_size, *buffer));
1441 EFI_CALL(f->close(f));
1443 if (ret != EFI_SUCCESS) {
1444 efi_free_pool(*buffer);
1452 * Load an EFI image into memory.
1454 * This function implements the LoadImage service.
1455 * See the Unified Extensible Firmware Interface (UEFI) specification
1458 * @boot_policy true for request originating from the boot manager
1459 * @parent_image the calles's image handle
1460 * @file_path the path of the image to load
1461 * @source_buffer memory location from which the image is installed
1462 * @source_size size of the memory area from which the image is
1464 * @image_handle handle for the newly installed image
1465 * @return status code
1467 static efi_status_t EFIAPI efi_load_image(bool boot_policy,
1468 efi_handle_t parent_image,
1469 struct efi_device_path *file_path,
1470 void *source_buffer,
1471 unsigned long source_size,
1472 efi_handle_t *image_handle)
1474 struct efi_loaded_image *info;
1475 struct efi_object *obj;
1478 EFI_ENTRY("%d, %p, %pD, %p, %ld, %p", boot_policy, parent_image,
1479 file_path, source_buffer, source_size, image_handle);
1481 info = calloc(1, sizeof(*info));
1482 obj = calloc(1, sizeof(*obj));
1484 if (!source_buffer) {
1485 struct efi_device_path *dp, *fp;
1487 ret = efi_load_image_from_path(file_path, &source_buffer);
1488 if (ret != EFI_SUCCESS)
1491 * split file_path which contains both the device and
1494 efi_dp_split_file_path(file_path, &dp, &fp);
1495 ret = efi_setup_loaded_image(info, obj, dp, fp);
1496 if (ret != EFI_SUCCESS)
1499 /* In this case, file_path is the "device" path, ie.
1500 * something like a HARDWARE_DEVICE:MEMORY_MAPPED
1502 ret = efi_setup_loaded_image(info, obj, file_path, NULL);
1503 if (ret != EFI_SUCCESS)
1506 info->reserved = efi_load_pe(source_buffer, info);
1507 if (!info->reserved) {
1508 ret = EFI_UNSUPPORTED;
1511 info->system_table = &systab;
1512 info->parent_handle = parent_image;
1513 *image_handle = obj->handle;
1514 return EFI_EXIT(EFI_SUCCESS);
1517 efi_delete_handle(obj);
1518 return EFI_EXIT(ret);
1522 * Call the entry point of an image.
1524 * This function implements the StartImage service.
1525 * See the Unified Extensible Firmware Interface (UEFI) specification
1528 * @image_handle handle of the image
1529 * @exit_data_size size of the buffer
1530 * @exit_data buffer to receive the exit data of the called image
1531 * @return status code
1533 static efi_status_t EFIAPI efi_start_image(efi_handle_t image_handle,
1534 unsigned long *exit_data_size,
1537 asmlinkage ulong (*entry)(efi_handle_t image_handle,
1538 struct efi_system_table *st);
1539 struct efi_loaded_image *info = image_handle;
1542 EFI_ENTRY("%p, %p, %p", image_handle, exit_data_size, exit_data);
1543 entry = info->reserved;
1545 efi_is_direct_boot = false;
1547 /* call the image! */
1548 if (setjmp(&info->exit_jmp)) {
1550 * We called the entry point of the child image with EFI_CALL
1551 * in the lines below. The child image called the Exit() boot
1552 * service efi_exit() which executed the long jump that brought
1553 * us to the current line. This implies that the second half
1554 * of the EFI_CALL macro has not been executed.
1558 * efi_exit() called efi_restore_gd(). We have to undo this
1559 * otherwise __efi_entry_check() will put the wrong value into
1565 * To get ready to call EFI_EXIT below we have to execute the
1566 * missed out steps of EFI_CALL.
1568 assert(__efi_entry_check());
1569 debug("%sEFI: %lu returned by started image\n",
1570 __efi_nesting_dec(),
1571 (unsigned long)((uintptr_t)info->exit_status &
1573 return EFI_EXIT(info->exit_status);
1576 ret = EFI_CALL(entry(image_handle, &systab));
1578 /* Should usually never get here */
1579 return EFI_EXIT(ret);
1583 * Leave an EFI application or driver.
1585 * This function implements the Exit service.
1586 * See the Unified Extensible Firmware Interface (UEFI) specification
1589 * @image_handle handle of the application or driver that is exiting
1590 * @exit_status status code
1591 * @exit_data_size size of the buffer in bytes
1592 * @exit_data buffer with data describing an error
1593 * @return status code
1595 static efi_status_t EFIAPI efi_exit(efi_handle_t image_handle,
1596 efi_status_t exit_status, unsigned long exit_data_size,
1600 * We require that the handle points to the original loaded
1601 * image protocol interface.
1603 * For getting the longjmp address this is safer than locating
1604 * the protocol because the protocol may have been reinstalled
1605 * pointing to another memory location.
1607 * TODO: We should call the unload procedure of the loaded
1610 struct efi_loaded_image *loaded_image_info = (void*)image_handle;
1612 EFI_ENTRY("%p, %ld, %ld, %p", image_handle, exit_status,
1613 exit_data_size, exit_data);
1615 /* Make sure entry/exit counts for EFI world cross-overs match */
1616 EFI_EXIT(exit_status);
1619 * But longjmp out with the U-Boot gd, not the application's, as
1620 * the other end is a setjmp call inside EFI context.
1624 loaded_image_info->exit_status = exit_status;
1625 longjmp(&loaded_image_info->exit_jmp, 1);
1627 panic("EFI application exited");
1631 * Unload an EFI image.
1633 * This function implements the UnloadImage service.
1634 * See the Unified Extensible Firmware Interface (UEFI) specification
1637 * @image_handle handle of the image to be unloaded
1638 * @return status code
1640 static efi_status_t EFIAPI efi_unload_image(efi_handle_t image_handle)
1642 struct efi_object *efiobj;
1644 EFI_ENTRY("%p", image_handle);
1645 efiobj = efi_search_obj(image_handle);
1647 list_del(&efiobj->link);
1649 return EFI_EXIT(EFI_SUCCESS);
1653 * Fix up caches for EFI payloads if necessary.
1655 static void efi_exit_caches(void)
1657 #if defined(CONFIG_ARM) && !defined(CONFIG_ARM64)
1659 * Grub on 32bit ARM needs to have caches disabled before jumping into
1660 * a zImage, but does not know of all cache layers. Give it a hand.
1662 if (efi_is_direct_boot)
1663 cleanup_before_linux();
1668 * Stop boot services.
1670 * This function implements the ExitBootServices service.
1671 * See the Unified Extensible Firmware Interface (UEFI) specification
1674 * @image_handle handle of the loaded image
1675 * @map_key key of the memory map
1676 * @return status code
1678 static efi_status_t EFIAPI efi_exit_boot_services(efi_handle_t image_handle,
1679 unsigned long map_key)
1683 EFI_ENTRY("%p, %ld", image_handle, map_key);
1685 /* Notify that ExitBootServices is invoked. */
1686 for (i = 0; i < ARRAY_SIZE(efi_events); ++i) {
1687 if (efi_events[i].type != EVT_SIGNAL_EXIT_BOOT_SERVICES)
1689 efi_signal_event(&efi_events[i]);
1691 /* Make sure that notification functions are not called anymore */
1692 efi_tpl = TPL_HIGH_LEVEL;
1694 /* XXX Should persist EFI variables here */
1696 board_quiesce_devices();
1698 /* Fix up caches for EFI payloads if necessary */
1701 /* This stops all lingering devices */
1702 bootm_disable_interrupts();
1704 /* Give the payload some time to boot */
1705 efi_set_watchdog(0);
1708 return EFI_EXIT(EFI_SUCCESS);
1712 * Get next value of the counter.
1714 * This function implements the NextMonotonicCount service.
1715 * See the Unified Extensible Firmware Interface (UEFI) specification
1718 * @count returned value of the counter
1719 * @return status code
1721 static efi_status_t EFIAPI efi_get_next_monotonic_count(uint64_t *count)
1723 static uint64_t mono = 0;
1724 EFI_ENTRY("%p", count);
1726 return EFI_EXIT(EFI_SUCCESS);
1732 * This function implements the Stall sercive.
1733 * See the Unified Extensible Firmware Interface (UEFI) specification
1736 * @microseconds period to sleep in microseconds
1737 * @return status code
1739 static efi_status_t EFIAPI efi_stall(unsigned long microseconds)
1741 EFI_ENTRY("%ld", microseconds);
1742 udelay(microseconds);
1743 return EFI_EXIT(EFI_SUCCESS);
1747 * Reset the watchdog timer.
1749 * This function implements the SetWatchdogTimer service.
1750 * See the Unified Extensible Firmware Interface (UEFI) specification
1753 * @timeout seconds before reset by watchdog
1754 * @watchdog_code code to be logged when resetting
1755 * @data_size size of buffer in bytes
1756 * @watchdog_data buffer with data describing the reset reason
1757 * @return status code
1759 static efi_status_t EFIAPI efi_set_watchdog_timer(unsigned long timeout,
1760 uint64_t watchdog_code,
1761 unsigned long data_size,
1762 uint16_t *watchdog_data)
1764 EFI_ENTRY("%ld, 0x%"PRIx64", %ld, %p", timeout, watchdog_code,
1765 data_size, watchdog_data);
1766 return EFI_EXIT(efi_set_watchdog(timeout));
1772 * This function implements the CloseProtocol service.
1773 * See the Unified Extensible Firmware Interface (UEFI) specification
1776 * @handle handle on which the protocol shall be closed
1777 * @protocol GUID of the protocol to close
1778 * @agent_handle handle of the driver
1779 * @controller_handle handle of the controller
1780 * @return status code
1782 static efi_status_t EFIAPI efi_close_protocol(efi_handle_t handle,
1783 const efi_guid_t *protocol,
1784 efi_handle_t agent_handle,
1785 efi_handle_t controller_handle)
1787 struct efi_handler *handler;
1788 struct efi_open_protocol_info_item *item;
1789 struct efi_open_protocol_info_item *pos;
1792 EFI_ENTRY("%p, %pUl, %p, %p", handle, protocol, agent_handle,
1795 if (!agent_handle) {
1796 r = EFI_INVALID_PARAMETER;
1799 r = efi_search_protocol(handle, protocol, &handler);
1800 if (r != EFI_SUCCESS)
1804 list_for_each_entry_safe(item, pos, &handler->open_infos, link) {
1805 if (item->info.agent_handle == agent_handle &&
1806 item->info.controller_handle == controller_handle) {
1807 efi_delete_open_info(item);
1817 * Provide information about then open status of a protocol on a handle
1819 * This function implements the OpenProtocolInformation service.
1820 * See the Unified Extensible Firmware Interface (UEFI) specification
1823 * @handle handle for which the information shall be retrieved
1824 * @protocol GUID of the protocol
1825 * @entry_buffer buffer to receive the open protocol information
1826 * @entry_count number of entries available in the buffer
1827 * @return status code
1829 static efi_status_t EFIAPI efi_open_protocol_information(efi_handle_t handle,
1830 const efi_guid_t *protocol,
1831 struct efi_open_protocol_info_entry **entry_buffer,
1832 efi_uintn_t *entry_count)
1834 unsigned long buffer_size;
1835 unsigned long count;
1836 struct efi_handler *handler;
1837 struct efi_open_protocol_info_item *item;
1840 EFI_ENTRY("%p, %pUl, %p, %p", handle, protocol, entry_buffer,
1843 /* Check parameters */
1844 if (!entry_buffer) {
1845 r = EFI_INVALID_PARAMETER;
1848 r = efi_search_protocol(handle, protocol, &handler);
1849 if (r != EFI_SUCCESS)
1854 list_for_each_entry(item, &handler->open_infos, link) {
1855 if (item->info.open_count)
1858 *entry_count = count;
1859 *entry_buffer = NULL;
1866 buffer_size = count * sizeof(struct efi_open_protocol_info_entry);
1867 r = efi_allocate_pool(EFI_ALLOCATE_ANY_PAGES, buffer_size,
1868 (void **)entry_buffer);
1869 if (r != EFI_SUCCESS)
1871 list_for_each_entry_reverse(item, &handler->open_infos, link) {
1872 if (item->info.open_count)
1873 (*entry_buffer)[--count] = item->info;
1880 * Get protocols installed on a handle.
1882 * This function implements the ProtocolsPerHandleService.
1883 * See the Unified Extensible Firmware Interface (UEFI) specification
1886 * @handle handle for which the information is retrieved
1887 * @protocol_buffer buffer with protocol GUIDs
1888 * @protocol_buffer_count number of entries in the buffer
1889 * @return status code
1891 static efi_status_t EFIAPI efi_protocols_per_handle(
1892 efi_handle_t handle, efi_guid_t ***protocol_buffer,
1893 efi_uintn_t *protocol_buffer_count)
1895 unsigned long buffer_size;
1896 struct efi_object *efiobj;
1897 struct list_head *protocol_handle;
1900 EFI_ENTRY("%p, %p, %p", handle, protocol_buffer,
1901 protocol_buffer_count);
1903 if (!handle || !protocol_buffer || !protocol_buffer_count)
1904 return EFI_EXIT(EFI_INVALID_PARAMETER);
1906 *protocol_buffer = NULL;
1907 *protocol_buffer_count = 0;
1909 efiobj = efi_search_obj(handle);
1911 return EFI_EXIT(EFI_INVALID_PARAMETER);
1913 /* Count protocols */
1914 list_for_each(protocol_handle, &efiobj->protocols) {
1915 ++*protocol_buffer_count;
1919 if (*protocol_buffer_count) {
1922 buffer_size = sizeof(efi_guid_t *) * *protocol_buffer_count;
1923 r = efi_allocate_pool(EFI_ALLOCATE_ANY_PAGES, buffer_size,
1924 (void **)protocol_buffer);
1925 if (r != EFI_SUCCESS)
1927 list_for_each(protocol_handle, &efiobj->protocols) {
1928 struct efi_handler *protocol;
1930 protocol = list_entry(protocol_handle,
1931 struct efi_handler, link);
1932 (*protocol_buffer)[j] = (void *)protocol->guid;
1937 return EFI_EXIT(EFI_SUCCESS);
1941 * Locate handles implementing a protocol.
1943 * This function implements the LocateHandleBuffer service.
1944 * See the Unified Extensible Firmware Interface (UEFI) specification
1947 * @search_type selection criterion
1948 * @protocol GUID of the protocol
1949 * @search_key registration key
1950 * @no_handles number of returned handles
1951 * @buffer buffer with the returned handles
1952 * @return status code
1954 static efi_status_t EFIAPI efi_locate_handle_buffer(
1955 enum efi_locate_search_type search_type,
1956 const efi_guid_t *protocol, void *search_key,
1957 efi_uintn_t *no_handles, efi_handle_t **buffer)
1960 efi_uintn_t buffer_size = 0;
1962 EFI_ENTRY("%d, %pUl, %p, %p, %p", search_type, protocol, search_key,
1963 no_handles, buffer);
1965 if (!no_handles || !buffer) {
1966 r = EFI_INVALID_PARAMETER;
1971 r = efi_locate_handle(search_type, protocol, search_key, &buffer_size,
1973 if (r != EFI_BUFFER_TOO_SMALL)
1975 r = efi_allocate_pool(EFI_ALLOCATE_ANY_PAGES, buffer_size,
1977 if (r != EFI_SUCCESS)
1979 r = efi_locate_handle(search_type, protocol, search_key, &buffer_size,
1981 if (r == EFI_SUCCESS)
1982 *no_handles = buffer_size / sizeof(efi_handle_t);
1988 * Find an interface implementing a protocol.
1990 * This function implements the LocateProtocol service.
1991 * See the Unified Extensible Firmware Interface (UEFI) specification
1994 * @protocol GUID of the protocol
1995 * @registration registration key passed to the notification function
1996 * @protocol_interface interface implementing the protocol
1997 * @return status code
1999 static efi_status_t EFIAPI efi_locate_protocol(const efi_guid_t *protocol,
2001 void **protocol_interface)
2003 struct list_head *lhandle;
2006 EFI_ENTRY("%pUl, %p, %p", protocol, registration, protocol_interface);
2008 if (!protocol || !protocol_interface)
2009 return EFI_EXIT(EFI_INVALID_PARAMETER);
2011 list_for_each(lhandle, &efi_obj_list) {
2012 struct efi_object *efiobj;
2013 struct efi_handler *handler;
2015 efiobj = list_entry(lhandle, struct efi_object, link);
2017 ret = efi_search_protocol(efiobj->handle, protocol, &handler);
2018 if (ret == EFI_SUCCESS) {
2019 *protocol_interface = handler->protocol_interface;
2020 return EFI_EXIT(EFI_SUCCESS);
2023 *protocol_interface = NULL;
2025 return EFI_EXIT(EFI_NOT_FOUND);
2029 * Get the device path and handle of an device implementing a protocol.
2031 * This function implements the LocateDevicePath service.
2032 * See the Unified Extensible Firmware Interface (UEFI) specification
2035 * @protocol GUID of the protocol
2036 * @device_path device path
2037 * @device handle of the device
2038 * @return status code
2040 static efi_status_t EFIAPI efi_locate_device_path(
2041 const efi_guid_t *protocol,
2042 struct efi_device_path **device_path,
2043 efi_handle_t *device)
2045 struct efi_device_path *dp;
2047 struct efi_handler *handler;
2048 efi_handle_t *handles;
2050 size_t len_best = 0;
2051 efi_uintn_t no_handles;
2055 EFI_ENTRY("%pUl, %p, %p", protocol, device_path, device);
2057 if (!protocol || !device_path || !*device_path || !device) {
2058 ret = EFI_INVALID_PARAMETER;
2062 /* Find end of device path */
2063 len = efi_dp_size(*device_path);
2065 /* Get all handles implementing the protocol */
2066 ret = EFI_CALL(efi_locate_handle_buffer(BY_PROTOCOL, protocol, NULL,
2067 &no_handles, &handles));
2068 if (ret != EFI_SUCCESS)
2071 for (i = 0; i < no_handles; ++i) {
2072 /* Find the device path protocol */
2073 ret = efi_search_protocol(handles[i], &efi_guid_device_path,
2075 if (ret != EFI_SUCCESS)
2077 dp = (struct efi_device_path *)handler->protocol_interface;
2078 len_dp = efi_dp_size(dp);
2080 * This handle can only be a better fit
2081 * if its device path length is longer than the best fit and
2082 * if its device path length is shorter of equal the searched
2085 if (len_dp <= len_best || len_dp > len)
2087 /* Check if dp is a subpath of device_path */
2088 if (memcmp(*device_path, dp, len_dp))
2090 *device = handles[i];
2094 remainder = (u8 *)*device_path + len_best;
2095 *device_path = (struct efi_device_path *)remainder;
2098 ret = EFI_NOT_FOUND;
2101 return EFI_EXIT(ret);
2105 * Install multiple protocol interfaces.
2107 * This function implements the MultipleProtocolInterfaces service.
2108 * See the Unified Extensible Firmware Interface (UEFI) specification
2111 * @handle handle on which the protocol interfaces shall be installed
2112 * @... NULL terminated argument list with pairs of protocol GUIDS and
2114 * @return status code
2116 static efi_status_t EFIAPI efi_install_multiple_protocol_interfaces(
2119 EFI_ENTRY("%p", handle);
2122 const efi_guid_t *protocol;
2123 void *protocol_interface;
2124 efi_status_t r = EFI_SUCCESS;
2128 return EFI_EXIT(EFI_INVALID_PARAMETER);
2130 va_start(argptr, handle);
2132 protocol = va_arg(argptr, efi_guid_t*);
2135 protocol_interface = va_arg(argptr, void*);
2136 r = EFI_CALL(efi_install_protocol_interface(
2138 EFI_NATIVE_INTERFACE,
2139 protocol_interface));
2140 if (r != EFI_SUCCESS)
2145 if (r == EFI_SUCCESS)
2148 /* If an error occurred undo all changes. */
2149 va_start(argptr, handle);
2151 protocol = va_arg(argptr, efi_guid_t*);
2152 protocol_interface = va_arg(argptr, void*);
2153 EFI_CALL(efi_uninstall_protocol_interface(handle, protocol,
2154 protocol_interface));
2162 * Uninstall multiple protocol interfaces.
2164 * This function implements the UninstallMultipleProtocolInterfaces service.
2165 * See the Unified Extensible Firmware Interface (UEFI) specification
2168 * @handle handle from which the protocol interfaces shall be removed
2169 * @... NULL terminated argument list with pairs of protocol GUIDS and
2171 * @return status code
2173 static efi_status_t EFIAPI efi_uninstall_multiple_protocol_interfaces(
2176 EFI_ENTRY("%p", handle);
2179 const efi_guid_t *protocol;
2180 void *protocol_interface;
2181 efi_status_t r = EFI_SUCCESS;
2185 return EFI_EXIT(EFI_INVALID_PARAMETER);
2187 va_start(argptr, handle);
2189 protocol = va_arg(argptr, efi_guid_t*);
2192 protocol_interface = va_arg(argptr, void*);
2193 r = EFI_CALL(efi_uninstall_protocol_interface(
2195 protocol_interface));
2196 if (r != EFI_SUCCESS)
2201 if (r == EFI_SUCCESS)
2204 /* If an error occurred undo all changes. */
2205 va_start(argptr, handle);
2207 protocol = va_arg(argptr, efi_guid_t*);
2208 protocol_interface = va_arg(argptr, void*);
2209 EFI_CALL(efi_install_protocol_interface(&handle, protocol,
2210 EFI_NATIVE_INTERFACE,
2211 protocol_interface));
2219 * Calculate cyclic redundancy code.
2221 * This function implements the CalculateCrc32 service.
2222 * See the Unified Extensible Firmware Interface (UEFI) specification
2225 * @data buffer with data
2226 * @data_size size of buffer in bytes
2227 * @crc32_p cyclic redundancy code
2228 * @return status code
2230 static efi_status_t EFIAPI efi_calculate_crc32(void *data,
2231 unsigned long data_size,
2234 EFI_ENTRY("%p, %ld", data, data_size);
2235 *crc32_p = crc32(0, data, data_size);
2236 return EFI_EXIT(EFI_SUCCESS);
2242 * This function implements the CopyMem service.
2243 * See the Unified Extensible Firmware Interface (UEFI) specification
2246 * @destination destination of the copy operation
2247 * @source source of the copy operation
2248 * @length number of bytes to copy
2250 static void EFIAPI efi_copy_mem(void *destination, const void *source,
2253 EFI_ENTRY("%p, %p, %ld", destination, source, (unsigned long)length);
2254 memcpy(destination, source, length);
2255 EFI_EXIT(EFI_SUCCESS);
2259 * Fill memory with a byte value.
2261 * This function implements the SetMem service.
2262 * See the Unified Extensible Firmware Interface (UEFI) specification
2265 * @buffer buffer to fill
2266 * @size size of buffer in bytes
2267 * @value byte to copy to the buffer
2269 static void EFIAPI efi_set_mem(void *buffer, size_t size, uint8_t value)
2271 EFI_ENTRY("%p, %ld, 0x%x", buffer, (unsigned long)size, value);
2272 memset(buffer, value, size);
2273 EFI_EXIT(EFI_SUCCESS);
2277 * Open protocol interface on a handle.
2279 * @handler handler of a protocol
2280 * @protocol_interface interface implementing the protocol
2281 * @agent_handle handle of the driver
2282 * @controller_handle handle of the controller
2283 * @attributes attributes indicating how to open the protocol
2284 * @return status code
2286 static efi_status_t efi_protocol_open(
2287 struct efi_handler *handler,
2288 void **protocol_interface, void *agent_handle,
2289 void *controller_handle, uint32_t attributes)
2291 struct efi_open_protocol_info_item *item;
2292 struct efi_open_protocol_info_entry *match = NULL;
2293 bool opened_by_driver = false;
2294 bool opened_exclusive = false;
2296 /* If there is no agent, only return the interface */
2300 /* For TEST_PROTOCOL ignore interface attribute */
2301 if (attributes != EFI_OPEN_PROTOCOL_TEST_PROTOCOL)
2302 *protocol_interface = NULL;
2305 * Check if the protocol is already opened by a driver with the same
2306 * attributes or opened exclusively
2308 list_for_each_entry(item, &handler->open_infos, link) {
2309 if (item->info.agent_handle == agent_handle) {
2310 if ((attributes & EFI_OPEN_PROTOCOL_BY_DRIVER) &&
2311 (item->info.attributes == attributes))
2312 return EFI_ALREADY_STARTED;
2314 if (item->info.attributes & EFI_OPEN_PROTOCOL_EXCLUSIVE)
2315 opened_exclusive = true;
2318 /* Only one controller can open the protocol exclusively */
2319 if (opened_exclusive && attributes &
2320 (EFI_OPEN_PROTOCOL_EXCLUSIVE | EFI_OPEN_PROTOCOL_BY_DRIVER))
2321 return EFI_ACCESS_DENIED;
2323 /* Prepare exclusive opening */
2324 if (attributes & EFI_OPEN_PROTOCOL_EXCLUSIVE) {
2325 /* Try to disconnect controllers */
2326 list_for_each_entry(item, &handler->open_infos, link) {
2327 if (item->info.attributes ==
2328 EFI_OPEN_PROTOCOL_BY_DRIVER)
2329 EFI_CALL(efi_disconnect_controller(
2330 item->info.controller_handle,
2331 item->info.agent_handle,
2334 opened_by_driver = false;
2335 /* Check if all controllers are disconnected */
2336 list_for_each_entry(item, &handler->open_infos, link) {
2337 if (item->info.attributes & EFI_OPEN_PROTOCOL_BY_DRIVER)
2338 opened_by_driver = true;
2340 /* Only one controller can be conncected */
2341 if (opened_by_driver)
2342 return EFI_ACCESS_DENIED;
2345 /* Find existing entry */
2346 list_for_each_entry(item, &handler->open_infos, link) {
2347 if (item->info.agent_handle == agent_handle &&
2348 item->info.controller_handle == controller_handle)
2349 match = &item->info;
2351 /* None found, create one */
2353 match = efi_create_open_info(handler);
2355 return EFI_OUT_OF_RESOURCES;
2358 match->agent_handle = agent_handle;
2359 match->controller_handle = controller_handle;
2360 match->attributes = attributes;
2361 match->open_count++;
2364 /* For TEST_PROTOCOL ignore interface attribute. */
2365 if (attributes != EFI_OPEN_PROTOCOL_TEST_PROTOCOL)
2366 *protocol_interface = handler->protocol_interface;
2372 * Open protocol interface on a handle.
2374 * This function implements the OpenProtocol interface.
2375 * See the Unified Extensible Firmware Interface (UEFI) specification
2378 * @handle handle on which the protocol shall be opened
2379 * @protocol GUID of the protocol
2380 * @protocol_interface interface implementing the protocol
2381 * @agent_handle handle of the driver
2382 * @controller_handle handle of the controller
2383 * @attributes attributes indicating how to open the protocol
2384 * @return status code
2386 static efi_status_t EFIAPI efi_open_protocol(
2387 void *handle, const efi_guid_t *protocol,
2388 void **protocol_interface, void *agent_handle,
2389 void *controller_handle, uint32_t attributes)
2391 struct efi_handler *handler;
2392 efi_status_t r = EFI_INVALID_PARAMETER;
2394 EFI_ENTRY("%p, %pUl, %p, %p, %p, 0x%x", handle, protocol,
2395 protocol_interface, agent_handle, controller_handle,
2398 if (!handle || !protocol ||
2399 (!protocol_interface && attributes !=
2400 EFI_OPEN_PROTOCOL_TEST_PROTOCOL)) {
2404 switch (attributes) {
2405 case EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL:
2406 case EFI_OPEN_PROTOCOL_GET_PROTOCOL:
2407 case EFI_OPEN_PROTOCOL_TEST_PROTOCOL:
2409 case EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER:
2410 if (controller_handle == handle)
2413 case EFI_OPEN_PROTOCOL_BY_DRIVER:
2414 case EFI_OPEN_PROTOCOL_BY_DRIVER | EFI_OPEN_PROTOCOL_EXCLUSIVE:
2415 /* Check that the controller handle is valid */
2416 if (!efi_search_obj(controller_handle))
2419 case EFI_OPEN_PROTOCOL_EXCLUSIVE:
2420 /* Check that the agent handle is valid */
2421 if (!efi_search_obj(agent_handle))
2428 r = efi_search_protocol(handle, protocol, &handler);
2429 if (r != EFI_SUCCESS)
2432 r = efi_protocol_open(handler, protocol_interface, agent_handle,
2433 controller_handle, attributes);
2439 * Get interface of a protocol on a handle.
2441 * This function implements the HandleProtocol service.
2442 * See the Unified Extensible Firmware Interface (UEFI) specification
2445 * @handle handle on which the protocol shall be opened
2446 * @protocol GUID of the protocol
2447 * @protocol_interface interface implementing the protocol
2448 * @return status code
2450 static efi_status_t EFIAPI efi_handle_protocol(efi_handle_t handle,
2451 const efi_guid_t *protocol,
2452 void **protocol_interface)
2454 return efi_open_protocol(handle, protocol, protocol_interface, NULL,
2455 NULL, EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL);
2458 static efi_status_t efi_bind_controller(
2459 efi_handle_t controller_handle,
2460 efi_handle_t driver_image_handle,
2461 struct efi_device_path *remain_device_path)
2463 struct efi_driver_binding_protocol *binding_protocol;
2466 r = EFI_CALL(efi_open_protocol(driver_image_handle,
2467 &efi_guid_driver_binding_protocol,
2468 (void **)&binding_protocol,
2469 driver_image_handle, NULL,
2470 EFI_OPEN_PROTOCOL_GET_PROTOCOL));
2471 if (r != EFI_SUCCESS)
2473 r = EFI_CALL(binding_protocol->supported(binding_protocol,
2475 remain_device_path));
2476 if (r == EFI_SUCCESS)
2477 r = EFI_CALL(binding_protocol->start(binding_protocol,
2479 remain_device_path));
2480 EFI_CALL(efi_close_protocol(driver_image_handle,
2481 &efi_guid_driver_binding_protocol,
2482 driver_image_handle, NULL));
2486 static efi_status_t efi_connect_single_controller(
2487 efi_handle_t controller_handle,
2488 efi_handle_t *driver_image_handle,
2489 struct efi_device_path *remain_device_path)
2491 efi_handle_t *buffer;
2495 size_t connected = 0;
2497 /* Get buffer with all handles with driver binding protocol */
2498 r = EFI_CALL(efi_locate_handle_buffer(BY_PROTOCOL,
2499 &efi_guid_driver_binding_protocol,
2500 NULL, &count, &buffer));
2501 if (r != EFI_SUCCESS)
2504 /* Context Override */
2505 if (driver_image_handle) {
2506 for (; *driver_image_handle; ++driver_image_handle) {
2507 for (i = 0; i < count; ++i) {
2508 if (buffer[i] == *driver_image_handle) {
2510 r = efi_bind_controller(
2512 *driver_image_handle,
2513 remain_device_path);
2515 * For drivers that do not support the
2516 * controller or are already connected
2517 * we receive an error code here.
2519 if (r == EFI_SUCCESS)
2527 * TODO: Some overrides are not yet implemented:
2528 * - Platform Driver Override
2529 * - Driver Family Override Search
2530 * - Bus Specific Driver Override
2533 /* Driver Binding Search */
2534 for (i = 0; i < count; ++i) {
2536 r = efi_bind_controller(controller_handle,
2538 remain_device_path);
2539 if (r == EFI_SUCCESS)
2544 efi_free_pool(buffer);
2546 return EFI_NOT_FOUND;
2551 * Connect a controller to a driver.
2553 * This function implements the ConnectController service.
2554 * See the Unified Extensible Firmware Interface (UEFI) specification
2557 * First all driver binding protocol handles are tried for binding drivers.
2558 * Afterwards all handles that have openened a protocol of the controller
2559 * with EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER are connected to drivers.
2561 * @controller_handle handle of the controller
2562 * @driver_image_handle handle of the driver
2563 * @remain_device_path device path of a child controller
2564 * @recursive true to connect all child controllers
2565 * @return status code
2567 static efi_status_t EFIAPI efi_connect_controller(
2568 efi_handle_t controller_handle,
2569 efi_handle_t *driver_image_handle,
2570 struct efi_device_path *remain_device_path,
2574 efi_status_t ret = EFI_NOT_FOUND;
2575 struct efi_object *efiobj;
2577 EFI_ENTRY("%p, %p, %p, %d", controller_handle, driver_image_handle,
2578 remain_device_path, recursive);
2580 efiobj = efi_search_obj(controller_handle);
2582 ret = EFI_INVALID_PARAMETER;
2586 r = efi_connect_single_controller(controller_handle,
2587 driver_image_handle,
2588 remain_device_path);
2589 if (r == EFI_SUCCESS)
2592 struct efi_handler *handler;
2593 struct efi_open_protocol_info_item *item;
2595 list_for_each_entry(handler, &efiobj->protocols, link) {
2596 list_for_each_entry(item, &handler->open_infos, link) {
2597 if (item->info.attributes &
2598 EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER) {
2599 r = EFI_CALL(efi_connect_controller(
2600 item->info.controller_handle,
2601 driver_image_handle,
2604 if (r == EFI_SUCCESS)
2610 /* Check for child controller specified by end node */
2611 if (ret != EFI_SUCCESS && remain_device_path &&
2612 remain_device_path->type == DEVICE_PATH_TYPE_END)
2615 return EFI_EXIT(ret);
2619 * Get all child controllers associated to a driver.
2620 * The allocated buffer has to be freed with free().
2622 * @efiobj handle of the controller
2623 * @driver_handle handle of the driver
2624 * @number_of_children number of child controllers
2625 * @child_handle_buffer handles of the the child controllers
2627 static efi_status_t efi_get_child_controllers(
2628 struct efi_object *efiobj,
2629 efi_handle_t driver_handle,
2630 efi_uintn_t *number_of_children,
2631 efi_handle_t **child_handle_buffer)
2633 struct efi_handler *handler;
2634 struct efi_open_protocol_info_item *item;
2635 efi_uintn_t count = 0, i;
2638 /* Count all child controller associations */
2639 list_for_each_entry(handler, &efiobj->protocols, link) {
2640 list_for_each_entry(item, &handler->open_infos, link) {
2641 if (item->info.agent_handle == driver_handle &&
2642 item->info.attributes &
2643 EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER)
2648 * Create buffer. In case of duplicate child controller assignments
2649 * the buffer will be too large. But that does not harm.
2651 *number_of_children = 0;
2652 *child_handle_buffer = calloc(count, sizeof(efi_handle_t));
2653 if (!*child_handle_buffer)
2654 return EFI_OUT_OF_RESOURCES;
2655 /* Copy unique child handles */
2656 list_for_each_entry(handler, &efiobj->protocols, link) {
2657 list_for_each_entry(item, &handler->open_infos, link) {
2658 if (item->info.agent_handle == driver_handle &&
2659 item->info.attributes &
2660 EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER) {
2661 /* Check this is a new child controller */
2663 for (i = 0; i < *number_of_children; ++i) {
2664 if ((*child_handle_buffer)[i] ==
2665 item->info.controller_handle)
2668 /* Copy handle to buffer */
2670 i = (*number_of_children)++;
2671 (*child_handle_buffer)[i] =
2672 item->info.controller_handle;
2681 * Disconnect a controller from a driver.
2683 * This function implements the DisconnectController service.
2684 * See the Unified Extensible Firmware Interface (UEFI) specification
2687 * @controller_handle handle of the controller
2688 * @driver_image_handle handle of the driver
2689 * @child_handle handle of the child to destroy
2690 * @return status code
2692 static efi_status_t EFIAPI efi_disconnect_controller(
2693 efi_handle_t controller_handle,
2694 efi_handle_t driver_image_handle,
2695 efi_handle_t child_handle)
2697 struct efi_driver_binding_protocol *binding_protocol;
2698 efi_handle_t *child_handle_buffer = NULL;
2699 size_t number_of_children = 0;
2701 size_t stop_count = 0;
2702 struct efi_object *efiobj;
2704 EFI_ENTRY("%p, %p, %p", controller_handle, driver_image_handle,
2707 efiobj = efi_search_obj(controller_handle);
2709 r = EFI_INVALID_PARAMETER;
2713 if (child_handle && !efi_search_obj(child_handle)) {
2714 r = EFI_INVALID_PARAMETER;
2718 /* If no driver handle is supplied, disconnect all drivers */
2719 if (!driver_image_handle) {
2720 r = efi_disconnect_all_drivers(efiobj, NULL, child_handle);
2724 /* Create list of child handles */
2726 number_of_children = 1;
2727 child_handle_buffer = &child_handle;
2729 efi_get_child_controllers(efiobj,
2730 driver_image_handle,
2731 &number_of_children,
2732 &child_handle_buffer);
2735 /* Get the driver binding protocol */
2736 r = EFI_CALL(efi_open_protocol(driver_image_handle,
2737 &efi_guid_driver_binding_protocol,
2738 (void **)&binding_protocol,
2739 driver_image_handle, NULL,
2740 EFI_OPEN_PROTOCOL_GET_PROTOCOL));
2741 if (r != EFI_SUCCESS)
2743 /* Remove the children */
2744 if (number_of_children) {
2745 r = EFI_CALL(binding_protocol->stop(binding_protocol,
2748 child_handle_buffer));
2749 if (r == EFI_SUCCESS)
2752 /* Remove the driver */
2754 r = EFI_CALL(binding_protocol->stop(binding_protocol,
2757 if (r == EFI_SUCCESS)
2759 EFI_CALL(efi_close_protocol(driver_image_handle,
2760 &efi_guid_driver_binding_protocol,
2761 driver_image_handle, NULL));
2769 free(child_handle_buffer);
2773 static const struct efi_boot_services efi_boot_services = {
2775 .headersize = sizeof(struct efi_table_hdr),
2777 .raise_tpl = efi_raise_tpl,
2778 .restore_tpl = efi_restore_tpl,
2779 .allocate_pages = efi_allocate_pages_ext,
2780 .free_pages = efi_free_pages_ext,
2781 .get_memory_map = efi_get_memory_map_ext,
2782 .allocate_pool = efi_allocate_pool_ext,
2783 .free_pool = efi_free_pool_ext,
2784 .create_event = efi_create_event_ext,
2785 .set_timer = efi_set_timer_ext,
2786 .wait_for_event = efi_wait_for_event,
2787 .signal_event = efi_signal_event_ext,
2788 .close_event = efi_close_event,
2789 .check_event = efi_check_event,
2790 .install_protocol_interface = efi_install_protocol_interface,
2791 .reinstall_protocol_interface = efi_reinstall_protocol_interface,
2792 .uninstall_protocol_interface = efi_uninstall_protocol_interface,
2793 .handle_protocol = efi_handle_protocol,
2795 .register_protocol_notify = efi_register_protocol_notify,
2796 .locate_handle = efi_locate_handle_ext,
2797 .locate_device_path = efi_locate_device_path,
2798 .install_configuration_table = efi_install_configuration_table_ext,
2799 .load_image = efi_load_image,
2800 .start_image = efi_start_image,
2802 .unload_image = efi_unload_image,
2803 .exit_boot_services = efi_exit_boot_services,
2804 .get_next_monotonic_count = efi_get_next_monotonic_count,
2806 .set_watchdog_timer = efi_set_watchdog_timer,
2807 .connect_controller = efi_connect_controller,
2808 .disconnect_controller = efi_disconnect_controller,
2809 .open_protocol = efi_open_protocol,
2810 .close_protocol = efi_close_protocol,
2811 .open_protocol_information = efi_open_protocol_information,
2812 .protocols_per_handle = efi_protocols_per_handle,
2813 .locate_handle_buffer = efi_locate_handle_buffer,
2814 .locate_protocol = efi_locate_protocol,
2815 .install_multiple_protocol_interfaces = efi_install_multiple_protocol_interfaces,
2816 .uninstall_multiple_protocol_interfaces = efi_uninstall_multiple_protocol_interfaces,
2817 .calculate_crc32 = efi_calculate_crc32,
2818 .copy_mem = efi_copy_mem,
2819 .set_mem = efi_set_mem,
2823 static uint16_t __efi_runtime_data firmware_vendor[] = L"Das U-Boot";
2825 struct efi_system_table __efi_runtime_data systab = {
2827 .signature = EFI_SYSTEM_TABLE_SIGNATURE,
2828 .revision = 0x20005, /* 2.5 */
2829 .headersize = sizeof(struct efi_table_hdr),
2831 .fw_vendor = (long)firmware_vendor,
2832 .con_in = (void*)&efi_con_in,
2833 .con_out = (void*)&efi_con_out,
2834 .std_err = (void*)&efi_con_out,
2835 .runtime = (void*)&efi_runtime_services,
2836 .boottime = (void*)&efi_boot_services,
2838 .tables = (void*)efi_conf_table,