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 <linux/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 * Return a string for indenting with two spaces per level. A maximum of ten
115 * indent levels is supported. Higher indent levels will be truncated.
117 * @level indent level
118 * @return indent string
120 static const char *indent_string(int level)
122 const char *indent = " ";
123 const int max = strlen(indent);
124 level = min(max, level * 2);
125 return &indent[max - level];
128 const char *__efi_nesting(void)
130 return indent_string(nesting_level);
133 const char *__efi_nesting_inc(void)
135 return indent_string(nesting_level++);
138 const char *__efi_nesting_dec(void)
140 return indent_string(--nesting_level);
144 * Queue an EFI event.
146 * This function queues the notification function of the event for future
149 * The notification function is called if the task priority level of the
150 * event is higher than the current task priority level.
152 * For the SignalEvent service see efi_signal_event_ext.
154 * @event event to signal
155 * @check_tpl check the TPL level
157 void efi_signal_event(struct efi_event *event, bool check_tpl)
159 if (event->notify_function) {
160 event->is_queued = true;
162 if (check_tpl && efi_tpl >= event->notify_tpl)
164 EFI_CALL_VOID(event->notify_function(event,
165 event->notify_context));
167 event->is_queued = false;
171 * Raise the task priority level.
173 * This function implements the RaiseTpl service.
174 * See the Unified Extensible Firmware Interface (UEFI) specification
177 * @new_tpl new value of the task priority level
178 * @return old value of the task priority level
180 static unsigned long EFIAPI efi_raise_tpl(efi_uintn_t new_tpl)
182 efi_uintn_t old_tpl = efi_tpl;
184 EFI_ENTRY("0x%zx", new_tpl);
186 if (new_tpl < efi_tpl)
187 debug("WARNING: new_tpl < current_tpl in %s\n", __func__);
189 if (efi_tpl > TPL_HIGH_LEVEL)
190 efi_tpl = TPL_HIGH_LEVEL;
192 EFI_EXIT(EFI_SUCCESS);
197 * Lower the task priority level.
199 * This function implements the RestoreTpl service.
200 * See the Unified Extensible Firmware Interface (UEFI) specification
203 * @old_tpl value of the task priority level to be restored
205 static void EFIAPI efi_restore_tpl(efi_uintn_t old_tpl)
207 EFI_ENTRY("0x%zx", old_tpl);
209 if (old_tpl > efi_tpl)
210 debug("WARNING: old_tpl > current_tpl in %s\n", __func__);
212 if (efi_tpl > TPL_HIGH_LEVEL)
213 efi_tpl = TPL_HIGH_LEVEL;
215 EFI_EXIT(EFI_SUCCESS);
219 * Allocate memory pages.
221 * This function implements the AllocatePages service.
222 * See the Unified Extensible Firmware Interface (UEFI) specification
225 * @type type of allocation to be performed
226 * @memory_type usage type of the allocated memory
227 * @pages number of pages to be allocated
228 * @memory allocated memory
229 * @return status code
231 static efi_status_t EFIAPI efi_allocate_pages_ext(int type, int memory_type,
237 EFI_ENTRY("%d, %d, 0x%zx, %p", type, memory_type, pages, memory);
238 r = efi_allocate_pages(type, memory_type, pages, memory);
245 * This function implements the FreePages service.
246 * See the Unified Extensible Firmware Interface (UEFI) specification
249 * @memory start of the memory area to be freed
250 * @pages number of pages to be freed
251 * @return status code
253 static efi_status_t EFIAPI efi_free_pages_ext(uint64_t memory,
258 EFI_ENTRY("%"PRIx64", 0x%zx", memory, pages);
259 r = efi_free_pages(memory, pages);
264 * Get map describing memory usage.
266 * This function implements the GetMemoryMap service.
267 * See the Unified Extensible Firmware Interface (UEFI) specification
270 * @memory_map_size on entry the size, in bytes, of the memory map buffer,
271 * on exit the size of the copied memory map
272 * @memory_map buffer to which the memory map is written
273 * @map_key key for the memory map
274 * @descriptor_size size of an individual memory descriptor
275 * @descriptor_version version number of the memory descriptor structure
276 * @return status code
278 static efi_status_t EFIAPI efi_get_memory_map_ext(
279 efi_uintn_t *memory_map_size,
280 struct efi_mem_desc *memory_map,
281 efi_uintn_t *map_key,
282 efi_uintn_t *descriptor_size,
283 uint32_t *descriptor_version)
287 EFI_ENTRY("%p, %p, %p, %p, %p", memory_map_size, memory_map,
288 map_key, descriptor_size, descriptor_version);
289 r = efi_get_memory_map(memory_map_size, memory_map, map_key,
290 descriptor_size, descriptor_version);
295 * Allocate memory from pool.
297 * This function implements the AllocatePool service.
298 * See the Unified Extensible Firmware Interface (UEFI) specification
301 * @pool_type type of the pool from which memory is to be allocated
302 * @size number of bytes to be allocated
303 * @buffer allocated memory
304 * @return status code
306 static efi_status_t EFIAPI efi_allocate_pool_ext(int pool_type,
312 EFI_ENTRY("%d, %zd, %p", pool_type, size, buffer);
313 r = efi_allocate_pool(pool_type, size, buffer);
318 * Free memory from pool.
320 * This function implements the FreePool service.
321 * See the Unified Extensible Firmware Interface (UEFI) specification
324 * @buffer start of memory to be freed
325 * @return status code
327 static efi_status_t EFIAPI efi_free_pool_ext(void *buffer)
331 EFI_ENTRY("%p", buffer);
332 r = efi_free_pool(buffer);
337 * Add a new object to the object list.
339 * The protocols list is initialized.
340 * The object handle is set.
342 * @obj object to be added
344 void efi_add_handle(struct efi_object *obj)
348 INIT_LIST_HEAD(&obj->protocols);
350 list_add_tail(&obj->link, &efi_obj_list);
357 * @return status code
359 efi_status_t efi_create_handle(efi_handle_t *handle)
361 struct efi_object *obj;
364 r = efi_allocate_pool(EFI_ALLOCATE_ANY_PAGES,
365 sizeof(struct efi_object),
367 if (r != EFI_SUCCESS)
370 *handle = obj->handle;
375 * Find a protocol on a handle.
378 * @protocol_guid GUID of the protocol
379 * @handler reference to the protocol
380 * @return status code
382 efi_status_t efi_search_protocol(const efi_handle_t handle,
383 const efi_guid_t *protocol_guid,
384 struct efi_handler **handler)
386 struct efi_object *efiobj;
387 struct list_head *lhandle;
389 if (!handle || !protocol_guid)
390 return EFI_INVALID_PARAMETER;
391 efiobj = efi_search_obj(handle);
393 return EFI_INVALID_PARAMETER;
394 list_for_each(lhandle, &efiobj->protocols) {
395 struct efi_handler *protocol;
397 protocol = list_entry(lhandle, struct efi_handler, link);
398 if (!guidcmp(protocol->guid, protocol_guid)) {
404 return EFI_NOT_FOUND;
408 * Delete protocol from a handle.
410 * @handle handle from which the protocol shall be deleted
411 * @protocol GUID of the protocol to be deleted
412 * @protocol_interface interface of the protocol implementation
413 * @return status code
415 efi_status_t efi_remove_protocol(const efi_handle_t handle,
416 const efi_guid_t *protocol,
417 void *protocol_interface)
419 struct efi_handler *handler;
422 ret = efi_search_protocol(handle, protocol, &handler);
423 if (ret != EFI_SUCCESS)
425 if (guidcmp(handler->guid, protocol))
426 return EFI_INVALID_PARAMETER;
427 list_del(&handler->link);
433 * Delete all protocols from a handle.
435 * @handle handle from which the protocols shall be deleted
436 * @return status code
438 efi_status_t efi_remove_all_protocols(const efi_handle_t handle)
440 struct efi_object *efiobj;
441 struct efi_handler *protocol;
442 struct efi_handler *pos;
444 efiobj = efi_search_obj(handle);
446 return EFI_INVALID_PARAMETER;
447 list_for_each_entry_safe(protocol, pos, &efiobj->protocols, link) {
450 ret = efi_remove_protocol(handle, protocol->guid,
451 protocol->protocol_interface);
452 if (ret != EFI_SUCCESS)
461 * @handle handle to delete
463 void efi_delete_handle(struct efi_object *obj)
467 efi_remove_all_protocols(obj->handle);
468 list_del(&obj->link);
473 * Our event capabilities are very limited. Only a small limited
474 * number of events is allowed to coexist.
476 static struct efi_event efi_events[16];
481 * This function is used inside U-Boot code to create an event.
483 * For the API function implementing the CreateEvent service see
484 * efi_create_event_ext.
486 * @type type of the event to create
487 * @notify_tpl task priority level of the event
488 * @notify_function notification function of the event
489 * @notify_context pointer passed to the notification function
490 * @event created event
491 * @return status code
493 efi_status_t efi_create_event(uint32_t type, efi_uintn_t notify_tpl,
494 void (EFIAPI *notify_function) (
495 struct efi_event *event,
497 void *notify_context, struct efi_event **event)
502 return EFI_INVALID_PARAMETER;
504 if ((type & EVT_NOTIFY_SIGNAL) && (type & EVT_NOTIFY_WAIT))
505 return EFI_INVALID_PARAMETER;
507 if ((type & (EVT_NOTIFY_SIGNAL|EVT_NOTIFY_WAIT)) &&
508 notify_function == NULL)
509 return EFI_INVALID_PARAMETER;
511 for (i = 0; i < ARRAY_SIZE(efi_events); ++i) {
512 if (efi_events[i].type)
514 efi_events[i].type = type;
515 efi_events[i].notify_tpl = notify_tpl;
516 efi_events[i].notify_function = notify_function;
517 efi_events[i].notify_context = notify_context;
518 /* Disable timers on bootup */
519 efi_events[i].trigger_next = -1ULL;
520 efi_events[i].is_queued = false;
521 efi_events[i].is_signaled = false;
522 *event = &efi_events[i];
525 return EFI_OUT_OF_RESOURCES;
529 * Create an event in a group.
531 * This function implements the CreateEventEx service.
532 * See the Unified Extensible Firmware Interface (UEFI) specification
534 * TODO: Support event groups
536 * @type type of the event to create
537 * @notify_tpl task priority level of the event
538 * @notify_function notification function of the event
539 * @notify_context pointer passed to the notification function
540 * @event created event
541 * @event_group event group
542 * @return status code
544 efi_status_t EFIAPI efi_create_event_ex(uint32_t type, efi_uintn_t notify_tpl,
545 void (EFIAPI *notify_function) (
546 struct efi_event *event,
548 void *notify_context,
549 efi_guid_t *event_group,
550 struct efi_event **event)
552 EFI_ENTRY("%d, 0x%zx, %p, %p, %pUl", type, notify_tpl, notify_function,
553 notify_context, event_group);
555 return EFI_EXIT(EFI_UNSUPPORTED);
556 return EFI_EXIT(efi_create_event(type, notify_tpl, notify_function,
557 notify_context, event));
563 * This function implements the CreateEvent service.
564 * See the Unified Extensible Firmware Interface (UEFI) specification
567 * @type type of the event to create
568 * @notify_tpl task priority level of the event
569 * @notify_function notification function of the event
570 * @notify_context pointer passed to the notification function
571 * @event created event
572 * @return status code
574 static efi_status_t EFIAPI efi_create_event_ext(
575 uint32_t type, efi_uintn_t notify_tpl,
576 void (EFIAPI *notify_function) (
577 struct efi_event *event,
579 void *notify_context, struct efi_event **event)
581 EFI_ENTRY("%d, 0x%zx, %p, %p", type, notify_tpl, notify_function,
583 return EFI_EXIT(efi_create_event(type, notify_tpl, notify_function,
584 notify_context, event));
589 * Check if a timer event has occurred or a queued notification function should
592 * Our timers have to work without interrupts, so we check whenever keyboard
593 * input or disk accesses happen if enough time elapsed for them to fire.
595 void efi_timer_check(void)
598 u64 now = timer_get_us();
600 for (i = 0; i < ARRAY_SIZE(efi_events); ++i) {
601 if (!efi_events[i].type)
603 if (efi_events[i].is_queued)
604 efi_signal_event(&efi_events[i], true);
605 if (!(efi_events[i].type & EVT_TIMER) ||
606 now < efi_events[i].trigger_next)
608 switch (efi_events[i].trigger_type) {
609 case EFI_TIMER_RELATIVE:
610 efi_events[i].trigger_type = EFI_TIMER_STOP;
612 case EFI_TIMER_PERIODIC:
613 efi_events[i].trigger_next +=
614 efi_events[i].trigger_time;
619 efi_events[i].is_signaled = true;
620 efi_signal_event(&efi_events[i], true);
626 * Set the trigger time for a timer event or stop the event.
628 * This is the function for internal usage in U-Boot. For the API function
629 * implementing the SetTimer service see efi_set_timer_ext.
631 * @event event for which the timer is set
632 * @type type of the timer
633 * @trigger_time trigger period in multiples of 100ns
634 * @return status code
636 efi_status_t efi_set_timer(struct efi_event *event, enum efi_timer_delay type,
637 uint64_t trigger_time)
642 * The parameter defines a multiple of 100ns.
643 * We use multiples of 1000ns. So divide by 10.
645 do_div(trigger_time, 10);
647 for (i = 0; i < ARRAY_SIZE(efi_events); ++i) {
648 if (event != &efi_events[i])
651 if (!(event->type & EVT_TIMER))
655 event->trigger_next = -1ULL;
657 case EFI_TIMER_PERIODIC:
658 case EFI_TIMER_RELATIVE:
659 event->trigger_next =
660 timer_get_us() + trigger_time;
663 return EFI_INVALID_PARAMETER;
665 event->trigger_type = type;
666 event->trigger_time = trigger_time;
667 event->is_signaled = false;
670 return EFI_INVALID_PARAMETER;
674 * Set the trigger time for a timer event or stop the event.
676 * This function implements the SetTimer service.
677 * See the Unified Extensible Firmware Interface (UEFI) specification
680 * @event event for which the timer is set
681 * @type type of the timer
682 * @trigger_time trigger period in multiples of 100ns
683 * @return status code
685 static efi_status_t EFIAPI efi_set_timer_ext(struct efi_event *event,
686 enum efi_timer_delay type,
687 uint64_t trigger_time)
689 EFI_ENTRY("%p, %d, %"PRIx64, event, type, trigger_time);
690 return EFI_EXIT(efi_set_timer(event, type, trigger_time));
694 * Wait for events to be signaled.
696 * This function implements the WaitForEvent service.
697 * See the Unified Extensible Firmware Interface (UEFI) specification
700 * @num_events number of events to be waited for
701 * @events events to be waited for
702 * @index index of the event that was signaled
703 * @return status code
705 static efi_status_t EFIAPI efi_wait_for_event(efi_uintn_t num_events,
706 struct efi_event **event,
711 EFI_ENTRY("%zd, %p, %p", num_events, event, index);
713 /* Check parameters */
714 if (!num_events || !event)
715 return EFI_EXIT(EFI_INVALID_PARAMETER);
717 if (efi_tpl != TPL_APPLICATION)
718 return EFI_EXIT(EFI_UNSUPPORTED);
719 for (i = 0; i < num_events; ++i) {
720 for (j = 0; j < ARRAY_SIZE(efi_events); ++j) {
721 if (event[i] == &efi_events[j])
724 return EFI_EXIT(EFI_INVALID_PARAMETER);
726 if (!event[i]->type || event[i]->type & EVT_NOTIFY_SIGNAL)
727 return EFI_EXIT(EFI_INVALID_PARAMETER);
728 if (!event[i]->is_signaled)
729 efi_signal_event(event[i], true);
732 /* Wait for signal */
734 for (i = 0; i < num_events; ++i) {
735 if (event[i]->is_signaled)
738 /* Allow events to occur. */
744 * Reset the signal which is passed to the caller to allow periodic
747 event[i]->is_signaled = false;
751 return EFI_EXIT(EFI_SUCCESS);
755 * Signal an EFI event.
757 * This function implements the SignalEvent service.
758 * See the Unified Extensible Firmware Interface (UEFI) specification
761 * This functions sets the signaled state of the event and queues the
762 * notification function for execution.
764 * @event event to signal
765 * @return status code
767 static efi_status_t EFIAPI efi_signal_event_ext(struct efi_event *event)
771 EFI_ENTRY("%p", event);
772 for (i = 0; i < ARRAY_SIZE(efi_events); ++i) {
773 if (event != &efi_events[i])
775 if (event->is_signaled)
777 event->is_signaled = true;
778 if (event->type & EVT_NOTIFY_SIGNAL)
779 efi_signal_event(event, true);
782 return EFI_EXIT(EFI_SUCCESS);
786 * Close an EFI event.
788 * This function implements the CloseEvent service.
789 * See the Unified Extensible Firmware Interface (UEFI) specification
792 * @event event to close
793 * @return status code
795 static efi_status_t EFIAPI efi_close_event(struct efi_event *event)
799 EFI_ENTRY("%p", event);
800 for (i = 0; i < ARRAY_SIZE(efi_events); ++i) {
801 if (event == &efi_events[i]) {
803 event->trigger_next = -1ULL;
804 event->is_queued = false;
805 event->is_signaled = false;
806 return EFI_EXIT(EFI_SUCCESS);
809 return EFI_EXIT(EFI_INVALID_PARAMETER);
813 * Check if an event is signaled.
815 * This function implements the CheckEvent service.
816 * See the Unified Extensible Firmware Interface (UEFI) specification
819 * If an event is not signaled yet the notification function is queued.
821 * @event event to check
822 * @return status code
824 static efi_status_t EFIAPI efi_check_event(struct efi_event *event)
828 EFI_ENTRY("%p", event);
830 for (i = 0; i < ARRAY_SIZE(efi_events); ++i) {
831 if (event != &efi_events[i])
833 if (!event->type || event->type & EVT_NOTIFY_SIGNAL)
835 if (!event->is_signaled)
836 efi_signal_event(event, true);
837 if (event->is_signaled)
838 return EFI_EXIT(EFI_SUCCESS);
839 return EFI_EXIT(EFI_NOT_READY);
841 return EFI_EXIT(EFI_INVALID_PARAMETER);
845 * Find the internal EFI object for a handle.
847 * @handle handle to find
850 struct efi_object *efi_search_obj(const efi_handle_t handle)
852 struct efi_object *efiobj;
854 list_for_each_entry(efiobj, &efi_obj_list, link) {
855 if (efiobj->handle == handle)
863 * Create open protocol info entry and add it to a protocol.
865 * @handler handler of a protocol
866 * @return open protocol info entry
868 static struct efi_open_protocol_info_entry *efi_create_open_info(
869 struct efi_handler *handler)
871 struct efi_open_protocol_info_item *item;
873 item = calloc(1, sizeof(struct efi_open_protocol_info_item));
876 /* Append the item to the open protocol info list. */
877 list_add_tail(&item->link, &handler->open_infos);
883 * Remove an open protocol info entry from a protocol.
885 * @handler handler of a protocol
886 * @return status code
888 static efi_status_t efi_delete_open_info(
889 struct efi_open_protocol_info_item *item)
891 list_del(&item->link);
897 * Install new protocol on a handle.
899 * @handle handle on which the protocol shall be installed
900 * @protocol GUID of the protocol to be installed
901 * @protocol_interface interface of the protocol implementation
902 * @return status code
904 efi_status_t efi_add_protocol(const efi_handle_t handle,
905 const efi_guid_t *protocol,
906 void *protocol_interface)
908 struct efi_object *efiobj;
909 struct efi_handler *handler;
912 efiobj = efi_search_obj(handle);
914 return EFI_INVALID_PARAMETER;
915 ret = efi_search_protocol(handle, protocol, NULL);
916 if (ret != EFI_NOT_FOUND)
917 return EFI_INVALID_PARAMETER;
918 handler = calloc(1, sizeof(struct efi_handler));
920 return EFI_OUT_OF_RESOURCES;
921 handler->guid = protocol;
922 handler->protocol_interface = protocol_interface;
923 INIT_LIST_HEAD(&handler->open_infos);
924 list_add_tail(&handler->link, &efiobj->protocols);
925 if (!guidcmp(&efi_guid_device_path, protocol))
926 EFI_PRINT("installed device path '%pD'\n", protocol_interface);
931 * Install protocol interface.
933 * This function implements the InstallProtocolInterface service.
934 * See the Unified Extensible Firmware Interface (UEFI) specification
937 * @handle handle on which the protocol shall be installed
938 * @protocol GUID of the protocol to be installed
939 * @protocol_interface_type type of the interface to be installed,
940 * always EFI_NATIVE_INTERFACE
941 * @protocol_interface interface of the protocol implementation
942 * @return status code
944 static efi_status_t EFIAPI efi_install_protocol_interface(
945 void **handle, const efi_guid_t *protocol,
946 int protocol_interface_type, void *protocol_interface)
950 EFI_ENTRY("%p, %pUl, %d, %p", handle, protocol, protocol_interface_type,
953 if (!handle || !protocol ||
954 protocol_interface_type != EFI_NATIVE_INTERFACE) {
955 r = EFI_INVALID_PARAMETER;
959 /* Create new handle if requested. */
961 r = efi_create_handle(handle);
962 if (r != EFI_SUCCESS)
964 debug("%sEFI: new handle %p\n", indent_string(nesting_level),
967 debug("%sEFI: handle %p\n", indent_string(nesting_level),
970 /* Add new protocol */
971 r = efi_add_protocol(*handle, protocol, protocol_interface);
977 * Reinstall protocol interface.
979 * This function implements the ReinstallProtocolInterface service.
980 * See the Unified Extensible Firmware Interface (UEFI) specification
983 * @handle handle on which the protocol shall be
985 * @protocol GUID of the protocol to be installed
986 * @old_interface interface to be removed
987 * @new_interface interface to be installed
988 * @return status code
990 static efi_status_t EFIAPI efi_reinstall_protocol_interface(
991 efi_handle_t handle, const efi_guid_t *protocol,
992 void *old_interface, void *new_interface)
994 EFI_ENTRY("%p, %pUl, %p, %p", handle, protocol, old_interface,
996 return EFI_EXIT(EFI_ACCESS_DENIED);
1000 * Get all drivers associated to a controller.
1001 * The allocated buffer has to be freed with free().
1003 * @efiobj handle of the controller
1004 * @protocol protocol guid (optional)
1005 * @number_of_drivers number of child controllers
1006 * @driver_handle_buffer handles of the the drivers
1007 * @return status code
1009 static efi_status_t efi_get_drivers(struct efi_object *efiobj,
1010 const efi_guid_t *protocol,
1011 efi_uintn_t *number_of_drivers,
1012 efi_handle_t **driver_handle_buffer)
1014 struct efi_handler *handler;
1015 struct efi_open_protocol_info_item *item;
1016 efi_uintn_t count = 0, i;
1019 /* Count all driver associations */
1020 list_for_each_entry(handler, &efiobj->protocols, link) {
1021 if (protocol && guidcmp(handler->guid, protocol))
1023 list_for_each_entry(item, &handler->open_infos, link) {
1024 if (item->info.attributes &
1025 EFI_OPEN_PROTOCOL_BY_DRIVER)
1030 * Create buffer. In case of duplicate driver assignments the buffer
1031 * will be too large. But that does not harm.
1033 *number_of_drivers = 0;
1034 *driver_handle_buffer = calloc(count, sizeof(efi_handle_t));
1035 if (!*driver_handle_buffer)
1036 return EFI_OUT_OF_RESOURCES;
1037 /* Collect unique driver handles */
1038 list_for_each_entry(handler, &efiobj->protocols, link) {
1039 if (protocol && guidcmp(handler->guid, protocol))
1041 list_for_each_entry(item, &handler->open_infos, link) {
1042 if (item->info.attributes &
1043 EFI_OPEN_PROTOCOL_BY_DRIVER) {
1044 /* Check this is a new driver */
1046 for (i = 0; i < *number_of_drivers; ++i) {
1047 if ((*driver_handle_buffer)[i] ==
1048 item->info.agent_handle)
1051 /* Copy handle to buffer */
1053 i = (*number_of_drivers)++;
1054 (*driver_handle_buffer)[i] =
1055 item->info.agent_handle;
1064 * Disconnect all drivers from a controller.
1066 * This function implements the DisconnectController service.
1067 * See the Unified Extensible Firmware Interface (UEFI) specification
1070 * @efiobj handle of the controller
1071 * @protocol protocol guid (optional)
1072 * @child_handle handle of the child to destroy
1073 * @return status code
1075 static efi_status_t efi_disconnect_all_drivers(
1076 struct efi_object *efiobj,
1077 const efi_guid_t *protocol,
1078 efi_handle_t child_handle)
1080 efi_uintn_t number_of_drivers;
1081 efi_handle_t *driver_handle_buffer;
1082 efi_status_t r, ret;
1084 ret = efi_get_drivers(efiobj, protocol, &number_of_drivers,
1085 &driver_handle_buffer);
1086 if (ret != EFI_SUCCESS)
1089 ret = EFI_NOT_FOUND;
1090 while (number_of_drivers) {
1091 r = EFI_CALL(efi_disconnect_controller(
1093 driver_handle_buffer[--number_of_drivers],
1095 if (r == EFI_SUCCESS)
1098 free(driver_handle_buffer);
1103 * Uninstall protocol interface.
1105 * This function implements the UninstallProtocolInterface service.
1106 * See the Unified Extensible Firmware Interface (UEFI) specification
1109 * @handle handle from which the protocol shall be removed
1110 * @protocol GUID of the protocol to be removed
1111 * @protocol_interface interface to be removed
1112 * @return status code
1114 static efi_status_t EFIAPI efi_uninstall_protocol_interface(
1115 efi_handle_t handle, const efi_guid_t *protocol,
1116 void *protocol_interface)
1118 struct efi_object *efiobj;
1119 struct efi_handler *handler;
1120 struct efi_open_protocol_info_item *item;
1121 struct efi_open_protocol_info_item *pos;
1124 EFI_ENTRY("%p, %pUl, %p", handle, protocol, protocol_interface);
1127 efiobj = efi_search_obj(handle);
1129 r = EFI_INVALID_PARAMETER;
1132 /* Find the protocol on the handle */
1133 r = efi_search_protocol(handle, protocol, &handler);
1134 if (r != EFI_SUCCESS)
1136 /* Disconnect controllers */
1137 efi_disconnect_all_drivers(efiobj, protocol, NULL);
1138 if (!list_empty(&handler->open_infos)) {
1139 r = EFI_ACCESS_DENIED;
1142 /* Close protocol */
1143 list_for_each_entry_safe(item, pos, &handler->open_infos, link) {
1144 if (item->info.attributes ==
1145 EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL ||
1146 item->info.attributes == EFI_OPEN_PROTOCOL_GET_PROTOCOL ||
1147 item->info.attributes == EFI_OPEN_PROTOCOL_TEST_PROTOCOL)
1148 list_del(&item->link);
1150 if (!list_empty(&handler->open_infos)) {
1151 r = EFI_ACCESS_DENIED;
1154 r = efi_remove_protocol(handle, protocol, protocol_interface);
1160 * Register an event for notification when a protocol is installed.
1162 * This function implements the RegisterProtocolNotify service.
1163 * See the Unified Extensible Firmware Interface (UEFI) specification
1166 * @protocol GUID of the protocol whose installation shall be
1168 * @event event to be signaled upon installation of the protocol
1169 * @registration key for retrieving the registration information
1170 * @return status code
1172 static efi_status_t EFIAPI efi_register_protocol_notify(
1173 const efi_guid_t *protocol,
1174 struct efi_event *event,
1175 void **registration)
1177 EFI_ENTRY("%pUl, %p, %p", protocol, event, registration);
1178 return EFI_EXIT(EFI_OUT_OF_RESOURCES);
1182 * Determine if an EFI handle implements a protocol.
1184 * See the documentation of the LocateHandle service in the UEFI specification.
1186 * @search_type selection criterion
1187 * @protocol GUID of the protocol
1188 * @search_key registration key
1190 * @return 0 if the handle implements the protocol
1192 static int efi_search(enum efi_locate_search_type search_type,
1193 const efi_guid_t *protocol, void *search_key,
1194 struct efi_object *efiobj)
1198 switch (search_type) {
1201 case BY_REGISTER_NOTIFY:
1202 /* TODO: RegisterProtocolNotify is not implemented yet */
1205 ret = efi_search_protocol(efiobj->handle, protocol, NULL);
1206 return (ret != EFI_SUCCESS);
1208 /* Invalid search type */
1214 * Locate handles implementing a protocol.
1216 * This function is meant for U-Boot internal calls. For the API implementation
1217 * of the LocateHandle service see efi_locate_handle_ext.
1219 * @search_type selection criterion
1220 * @protocol GUID of the protocol
1221 * @search_key registration key
1222 * @buffer_size size of the buffer to receive the handles in bytes
1223 * @buffer buffer to receive the relevant handles
1224 * @return status code
1226 static efi_status_t efi_locate_handle(
1227 enum efi_locate_search_type search_type,
1228 const efi_guid_t *protocol, void *search_key,
1229 efi_uintn_t *buffer_size, efi_handle_t *buffer)
1231 struct efi_object *efiobj;
1232 efi_uintn_t size = 0;
1234 /* Check parameters */
1235 switch (search_type) {
1238 case BY_REGISTER_NOTIFY:
1240 return EFI_INVALID_PARAMETER;
1241 /* RegisterProtocolNotify is not implemented yet */
1242 return EFI_UNSUPPORTED;
1245 return EFI_INVALID_PARAMETER;
1248 return EFI_INVALID_PARAMETER;
1252 * efi_locate_handle_buffer uses this function for
1253 * the calculation of the necessary buffer size.
1254 * So do not require a buffer for buffersize == 0.
1256 if (!buffer_size || (*buffer_size && !buffer))
1257 return EFI_INVALID_PARAMETER;
1259 /* Count how much space we need */
1260 list_for_each_entry(efiobj, &efi_obj_list, link) {
1261 if (!efi_search(search_type, protocol, search_key, efiobj))
1262 size += sizeof(void*);
1265 if (*buffer_size < size) {
1266 *buffer_size = size;
1267 return EFI_BUFFER_TOO_SMALL;
1270 *buffer_size = size;
1272 return EFI_NOT_FOUND;
1274 /* Then fill the array */
1275 list_for_each_entry(efiobj, &efi_obj_list, link) {
1276 if (!efi_search(search_type, protocol, search_key, efiobj))
1277 *buffer++ = efiobj->handle;
1284 * Locate handles implementing a protocol.
1286 * This function implements the LocateHandle service.
1287 * See the Unified Extensible Firmware Interface (UEFI) specification
1290 * @search_type selection criterion
1291 * @protocol GUID of the protocol
1292 * @search_key registration key
1293 * @buffer_size size of the buffer to receive the handles in bytes
1294 * @buffer buffer to receive the relevant handles
1295 * @return 0 if the handle implements the protocol
1297 static efi_status_t EFIAPI efi_locate_handle_ext(
1298 enum efi_locate_search_type search_type,
1299 const efi_guid_t *protocol, void *search_key,
1300 efi_uintn_t *buffer_size, efi_handle_t *buffer)
1302 EFI_ENTRY("%d, %pUl, %p, %p, %p", search_type, protocol, search_key,
1303 buffer_size, buffer);
1305 return EFI_EXIT(efi_locate_handle(search_type, protocol, search_key,
1306 buffer_size, buffer));
1309 /* Collapses configuration table entries, removing index i */
1310 static void efi_remove_configuration_table(int i)
1312 struct efi_configuration_table *this = &efi_conf_table[i];
1313 struct efi_configuration_table *next = &efi_conf_table[i+1];
1314 struct efi_configuration_table *end = &efi_conf_table[systab.nr_tables];
1316 memmove(this, next, (ulong)end - (ulong)next);
1321 * Adds, updates, or removes a configuration table.
1323 * This function is used for internal calls. For the API implementation of the
1324 * InstallConfigurationTable service see efi_install_configuration_table_ext.
1326 * @guid GUID of the installed table
1327 * @table table to be installed
1328 * @return status code
1330 efi_status_t efi_install_configuration_table(const efi_guid_t *guid, void *table)
1334 /* Check for guid override */
1335 for (i = 0; i < systab.nr_tables; i++) {
1336 if (!guidcmp(guid, &efi_conf_table[i].guid)) {
1338 efi_conf_table[i].table = table;
1340 efi_remove_configuration_table(i);
1346 return EFI_NOT_FOUND;
1348 /* No override, check for overflow */
1349 if (i >= ARRAY_SIZE(efi_conf_table))
1350 return EFI_OUT_OF_RESOURCES;
1352 /* Add a new entry */
1353 memcpy(&efi_conf_table[i].guid, guid, sizeof(*guid));
1354 efi_conf_table[i].table = table;
1355 systab.nr_tables = i + 1;
1361 * Adds, updates, or removes a configuration table.
1363 * This function implements the InstallConfigurationTable service.
1364 * See the Unified Extensible Firmware Interface (UEFI) specification
1367 * @guid GUID of the installed table
1368 * @table table to be installed
1369 * @return status code
1371 static efi_status_t EFIAPI efi_install_configuration_table_ext(efi_guid_t *guid,
1374 EFI_ENTRY("%pUl, %p", guid, table);
1375 return EFI_EXIT(efi_install_configuration_table(guid, table));
1379 * Initialize a loaded_image_info + loaded_image_info object with correct
1380 * protocols, boot-device, etc.
1382 * @info loaded image info to be passed to the entry point of the
1384 * @obj internal object associated with the loaded image
1385 * @device_path device path of the loaded image
1386 * @file_path file path of the loaded image
1387 * @return status code
1389 efi_status_t efi_setup_loaded_image(
1390 struct efi_loaded_image *info, struct efi_object *obj,
1391 struct efi_device_path *device_path,
1392 struct efi_device_path *file_path)
1396 /* Add internal object to object list */
1397 efi_add_handle(obj);
1398 /* efi_exit() assumes that the handle points to the info */
1401 info->file_path = file_path;
1404 info->device_handle = efi_dp_find_obj(device_path, NULL);
1406 * When asking for the device path interface, return
1407 * bootefi_device_path
1409 ret = efi_add_protocol(obj->handle, &efi_guid_device_path,
1411 if (ret != EFI_SUCCESS)
1416 * When asking for the loaded_image interface, just
1417 * return handle which points to loaded_image_info
1419 ret = efi_add_protocol(obj->handle, &efi_guid_loaded_image, info);
1420 if (ret != EFI_SUCCESS)
1423 ret = efi_add_protocol(obj->handle, &efi_guid_console_control,
1424 (void *)&efi_console_control);
1425 if (ret != EFI_SUCCESS)
1428 ret = efi_add_protocol(obj->handle,
1429 &efi_guid_device_path_to_text_protocol,
1430 (void *)&efi_device_path_to_text);
1431 if (ret != EFI_SUCCESS)
1436 printf("ERROR: Failure to install protocols for loaded image\n");
1441 * Load an image using a file path.
1443 * @file_path the path of the image to load
1444 * @buffer buffer containing the loaded image
1445 * @return status code
1447 efi_status_t efi_load_image_from_path(struct efi_device_path *file_path,
1450 struct efi_file_info *info = NULL;
1451 struct efi_file_handle *f;
1452 static efi_status_t ret;
1455 f = efi_file_from_path(file_path);
1457 return EFI_DEVICE_ERROR;
1460 EFI_CALL(ret = f->getinfo(f, (efi_guid_t *)&efi_file_info_guid,
1462 if (ret == EFI_BUFFER_TOO_SMALL) {
1464 EFI_CALL(ret = f->getinfo(f, (efi_guid_t *)&efi_file_info_guid,
1467 if (ret != EFI_SUCCESS)
1470 ret = efi_allocate_pool(EFI_LOADER_DATA, info->file_size, buffer);
1474 EFI_CALL(ret = f->read(f, &info->file_size, *buffer));
1478 EFI_CALL(f->close(f));
1480 if (ret != EFI_SUCCESS) {
1481 efi_free_pool(*buffer);
1489 * Load an EFI image into memory.
1491 * This function implements the LoadImage service.
1492 * See the Unified Extensible Firmware Interface (UEFI) specification
1495 * @boot_policy true for request originating from the boot manager
1496 * @parent_image the caller's image handle
1497 * @file_path the path of the image to load
1498 * @source_buffer memory location from which the image is installed
1499 * @source_size size of the memory area from which the image is
1501 * @image_handle handle for the newly installed image
1502 * @return status code
1504 static efi_status_t EFIAPI efi_load_image(bool boot_policy,
1505 efi_handle_t parent_image,
1506 struct efi_device_path *file_path,
1507 void *source_buffer,
1508 unsigned long source_size,
1509 efi_handle_t *image_handle)
1511 struct efi_loaded_image *info;
1512 struct efi_object *obj;
1515 EFI_ENTRY("%d, %p, %pD, %p, %ld, %p", boot_policy, parent_image,
1516 file_path, source_buffer, source_size, image_handle);
1518 info = calloc(1, sizeof(*info));
1519 obj = calloc(1, sizeof(*obj));
1521 if (!source_buffer) {
1522 struct efi_device_path *dp, *fp;
1524 ret = efi_load_image_from_path(file_path, &source_buffer);
1525 if (ret != EFI_SUCCESS)
1528 * split file_path which contains both the device and
1531 efi_dp_split_file_path(file_path, &dp, &fp);
1532 ret = efi_setup_loaded_image(info, obj, dp, fp);
1533 if (ret != EFI_SUCCESS)
1536 /* In this case, file_path is the "device" path, ie.
1537 * something like a HARDWARE_DEVICE:MEMORY_MAPPED
1539 ret = efi_setup_loaded_image(info, obj, file_path, NULL);
1540 if (ret != EFI_SUCCESS)
1543 info->reserved = efi_load_pe(source_buffer, info);
1544 if (!info->reserved) {
1545 ret = EFI_UNSUPPORTED;
1548 info->system_table = &systab;
1549 info->parent_handle = parent_image;
1550 *image_handle = obj->handle;
1551 return EFI_EXIT(EFI_SUCCESS);
1554 efi_delete_handle(obj);
1555 return EFI_EXIT(ret);
1559 * Call the entry point of an image.
1561 * This function implements the StartImage service.
1562 * See the Unified Extensible Firmware Interface (UEFI) specification
1565 * @image_handle handle of the image
1566 * @exit_data_size size of the buffer
1567 * @exit_data buffer to receive the exit data of the called image
1568 * @return status code
1570 static efi_status_t EFIAPI efi_start_image(efi_handle_t image_handle,
1571 unsigned long *exit_data_size,
1574 EFIAPI efi_status_t (*entry)(efi_handle_t image_handle,
1575 struct efi_system_table *st);
1576 struct efi_loaded_image *info = image_handle;
1579 EFI_ENTRY("%p, %p, %p", image_handle, exit_data_size, exit_data);
1580 entry = info->reserved;
1582 efi_is_direct_boot = false;
1584 /* call the image! */
1585 if (setjmp(&info->exit_jmp)) {
1587 * We called the entry point of the child image with EFI_CALL
1588 * in the lines below. The child image called the Exit() boot
1589 * service efi_exit() which executed the long jump that brought
1590 * us to the current line. This implies that the second half
1591 * of the EFI_CALL macro has not been executed.
1595 * efi_exit() called efi_restore_gd(). We have to undo this
1596 * otherwise __efi_entry_check() will put the wrong value into
1602 * To get ready to call EFI_EXIT below we have to execute the
1603 * missed out steps of EFI_CALL.
1605 assert(__efi_entry_check());
1606 debug("%sEFI: %lu returned by started image\n",
1607 __efi_nesting_dec(),
1608 (unsigned long)((uintptr_t)info->exit_status &
1610 return EFI_EXIT(info->exit_status);
1613 ret = EFI_CALL(entry(image_handle, &systab));
1616 * Usually UEFI applications call Exit() instead of returning.
1617 * But because the world doesn not consist of ponies and unicorns,
1618 * we're happy to emulate that behavior on behalf of a payload
1621 return EFI_CALL(systab.boottime->exit(image_handle, ret, 0, NULL));
1625 * Leave an EFI application or driver.
1627 * This function implements the Exit service.
1628 * See the Unified Extensible Firmware Interface (UEFI) specification
1631 * @image_handle handle of the application or driver that is exiting
1632 * @exit_status status code
1633 * @exit_data_size size of the buffer in bytes
1634 * @exit_data buffer with data describing an error
1635 * @return status code
1637 static efi_status_t EFIAPI efi_exit(efi_handle_t image_handle,
1638 efi_status_t exit_status, unsigned long exit_data_size,
1642 * We require that the handle points to the original loaded
1643 * image protocol interface.
1645 * For getting the longjmp address this is safer than locating
1646 * the protocol because the protocol may have been reinstalled
1647 * pointing to another memory location.
1649 * TODO: We should call the unload procedure of the loaded
1652 struct efi_loaded_image *loaded_image_info = (void*)image_handle;
1654 EFI_ENTRY("%p, %ld, %ld, %p", image_handle, exit_status,
1655 exit_data_size, exit_data);
1657 /* Make sure entry/exit counts for EFI world cross-overs match */
1658 EFI_EXIT(exit_status);
1661 * But longjmp out with the U-Boot gd, not the application's, as
1662 * the other end is a setjmp call inside EFI context.
1666 loaded_image_info->exit_status = exit_status;
1667 longjmp(&loaded_image_info->exit_jmp, 1);
1669 panic("EFI application exited");
1673 * Unload an EFI image.
1675 * This function implements the UnloadImage service.
1676 * See the Unified Extensible Firmware Interface (UEFI) specification
1679 * @image_handle handle of the image to be unloaded
1680 * @return status code
1682 static efi_status_t EFIAPI efi_unload_image(efi_handle_t image_handle)
1684 struct efi_object *efiobj;
1686 EFI_ENTRY("%p", image_handle);
1687 efiobj = efi_search_obj(image_handle);
1689 list_del(&efiobj->link);
1691 return EFI_EXIT(EFI_SUCCESS);
1695 * Fix up caches for EFI payloads if necessary.
1697 static void efi_exit_caches(void)
1699 #if defined(CONFIG_ARM) && !defined(CONFIG_ARM64)
1701 * Grub on 32bit ARM needs to have caches disabled before jumping into
1702 * a zImage, but does not know of all cache layers. Give it a hand.
1704 if (efi_is_direct_boot)
1705 cleanup_before_linux();
1710 * Stop all boot services.
1712 * This function implements the ExitBootServices service.
1713 * See the Unified Extensible Firmware Interface (UEFI) specification
1716 * All timer events are disabled.
1717 * For exit boot services events the notification function is called.
1718 * The boot services are disabled in the system table.
1720 * @image_handle handle of the loaded image
1721 * @map_key key of the memory map
1722 * @return status code
1724 static efi_status_t EFIAPI efi_exit_boot_services(efi_handle_t image_handle,
1725 unsigned long map_key)
1729 EFI_ENTRY("%p, %ld", image_handle, map_key);
1731 /* Make sure that notification functions are not called anymore */
1732 efi_tpl = TPL_HIGH_LEVEL;
1734 /* Check if ExitBootServices has already been called */
1735 if (!systab.boottime)
1736 return EFI_EXIT(EFI_SUCCESS);
1738 /* Notify that ExitBootServices is invoked. */
1739 for (i = 0; i < ARRAY_SIZE(efi_events); ++i) {
1740 if (efi_events[i].type != EVT_SIGNAL_EXIT_BOOT_SERVICES)
1742 efi_events[i].is_signaled = true;
1743 efi_signal_event(&efi_events[i], false);
1746 /* TODO Should persist EFI variables here */
1748 board_quiesce_devices();
1750 /* Fix up caches for EFI payloads if necessary */
1753 /* This stops all lingering devices */
1754 bootm_disable_interrupts();
1756 /* Disable boottime services */
1757 systab.con_in_handle = NULL;
1758 systab.con_in = NULL;
1759 systab.con_out_handle = NULL;
1760 systab.con_out = NULL;
1761 systab.stderr_handle = NULL;
1762 systab.std_err = NULL;
1763 systab.boottime = NULL;
1765 /* Recalculate CRC32 */
1766 systab.hdr.crc32 = 0;
1767 systab.hdr.crc32 = crc32(0, (const unsigned char *)&systab,
1768 sizeof(struct efi_system_table));
1770 /* Give the payload some time to boot */
1771 efi_set_watchdog(0);
1774 return EFI_EXIT(EFI_SUCCESS);
1778 * Get next value of the counter.
1780 * This function implements the NextMonotonicCount service.
1781 * See the Unified Extensible Firmware Interface (UEFI) specification
1784 * @count returned value of the counter
1785 * @return status code
1787 static efi_status_t EFIAPI efi_get_next_monotonic_count(uint64_t *count)
1789 static uint64_t mono = 0;
1790 EFI_ENTRY("%p", count);
1792 return EFI_EXIT(EFI_SUCCESS);
1798 * This function implements the Stall sercive.
1799 * See the Unified Extensible Firmware Interface (UEFI) specification
1802 * @microseconds period to sleep in microseconds
1803 * @return status code
1805 static efi_status_t EFIAPI efi_stall(unsigned long microseconds)
1807 EFI_ENTRY("%ld", microseconds);
1808 udelay(microseconds);
1809 return EFI_EXIT(EFI_SUCCESS);
1813 * Reset the watchdog timer.
1815 * This function implements the SetWatchdogTimer service.
1816 * See the Unified Extensible Firmware Interface (UEFI) specification
1819 * @timeout seconds before reset by watchdog
1820 * @watchdog_code code to be logged when resetting
1821 * @data_size size of buffer in bytes
1822 * @watchdog_data buffer with data describing the reset reason
1823 * @return status code
1825 static efi_status_t EFIAPI efi_set_watchdog_timer(unsigned long timeout,
1826 uint64_t watchdog_code,
1827 unsigned long data_size,
1828 uint16_t *watchdog_data)
1830 EFI_ENTRY("%ld, 0x%"PRIx64", %ld, %p", timeout, watchdog_code,
1831 data_size, watchdog_data);
1832 return EFI_EXIT(efi_set_watchdog(timeout));
1838 * This function implements the CloseProtocol service.
1839 * See the Unified Extensible Firmware Interface (UEFI) specification
1842 * @handle handle on which the protocol shall be closed
1843 * @protocol GUID of the protocol to close
1844 * @agent_handle handle of the driver
1845 * @controller_handle handle of the controller
1846 * @return status code
1848 static efi_status_t EFIAPI efi_close_protocol(efi_handle_t handle,
1849 const efi_guid_t *protocol,
1850 efi_handle_t agent_handle,
1851 efi_handle_t controller_handle)
1853 struct efi_handler *handler;
1854 struct efi_open_protocol_info_item *item;
1855 struct efi_open_protocol_info_item *pos;
1858 EFI_ENTRY("%p, %pUl, %p, %p", handle, protocol, agent_handle,
1861 if (!agent_handle) {
1862 r = EFI_INVALID_PARAMETER;
1865 r = efi_search_protocol(handle, protocol, &handler);
1866 if (r != EFI_SUCCESS)
1870 list_for_each_entry_safe(item, pos, &handler->open_infos, link) {
1871 if (item->info.agent_handle == agent_handle &&
1872 item->info.controller_handle == controller_handle) {
1873 efi_delete_open_info(item);
1883 * Provide information about then open status of a protocol on a handle
1885 * This function implements the OpenProtocolInformation service.
1886 * See the Unified Extensible Firmware Interface (UEFI) specification
1889 * @handle handle for which the information shall be retrieved
1890 * @protocol GUID of the protocol
1891 * @entry_buffer buffer to receive the open protocol information
1892 * @entry_count number of entries available in the buffer
1893 * @return status code
1895 static efi_status_t EFIAPI efi_open_protocol_information(efi_handle_t handle,
1896 const efi_guid_t *protocol,
1897 struct efi_open_protocol_info_entry **entry_buffer,
1898 efi_uintn_t *entry_count)
1900 unsigned long buffer_size;
1901 unsigned long count;
1902 struct efi_handler *handler;
1903 struct efi_open_protocol_info_item *item;
1906 EFI_ENTRY("%p, %pUl, %p, %p", handle, protocol, entry_buffer,
1909 /* Check parameters */
1910 if (!entry_buffer) {
1911 r = EFI_INVALID_PARAMETER;
1914 r = efi_search_protocol(handle, protocol, &handler);
1915 if (r != EFI_SUCCESS)
1920 list_for_each_entry(item, &handler->open_infos, link) {
1921 if (item->info.open_count)
1924 *entry_count = count;
1925 *entry_buffer = NULL;
1932 buffer_size = count * sizeof(struct efi_open_protocol_info_entry);
1933 r = efi_allocate_pool(EFI_ALLOCATE_ANY_PAGES, buffer_size,
1934 (void **)entry_buffer);
1935 if (r != EFI_SUCCESS)
1937 list_for_each_entry_reverse(item, &handler->open_infos, link) {
1938 if (item->info.open_count)
1939 (*entry_buffer)[--count] = item->info;
1946 * Get protocols installed on a handle.
1948 * This function implements the ProtocolsPerHandleService.
1949 * See the Unified Extensible Firmware Interface (UEFI) specification
1952 * @handle handle for which the information is retrieved
1953 * @protocol_buffer buffer with protocol GUIDs
1954 * @protocol_buffer_count number of entries in the buffer
1955 * @return status code
1957 static efi_status_t EFIAPI efi_protocols_per_handle(
1958 efi_handle_t handle, efi_guid_t ***protocol_buffer,
1959 efi_uintn_t *protocol_buffer_count)
1961 unsigned long buffer_size;
1962 struct efi_object *efiobj;
1963 struct list_head *protocol_handle;
1966 EFI_ENTRY("%p, %p, %p", handle, protocol_buffer,
1967 protocol_buffer_count);
1969 if (!handle || !protocol_buffer || !protocol_buffer_count)
1970 return EFI_EXIT(EFI_INVALID_PARAMETER);
1972 *protocol_buffer = NULL;
1973 *protocol_buffer_count = 0;
1975 efiobj = efi_search_obj(handle);
1977 return EFI_EXIT(EFI_INVALID_PARAMETER);
1979 /* Count protocols */
1980 list_for_each(protocol_handle, &efiobj->protocols) {
1981 ++*protocol_buffer_count;
1985 if (*protocol_buffer_count) {
1988 buffer_size = sizeof(efi_guid_t *) * *protocol_buffer_count;
1989 r = efi_allocate_pool(EFI_ALLOCATE_ANY_PAGES, buffer_size,
1990 (void **)protocol_buffer);
1991 if (r != EFI_SUCCESS)
1993 list_for_each(protocol_handle, &efiobj->protocols) {
1994 struct efi_handler *protocol;
1996 protocol = list_entry(protocol_handle,
1997 struct efi_handler, link);
1998 (*protocol_buffer)[j] = (void *)protocol->guid;
2003 return EFI_EXIT(EFI_SUCCESS);
2007 * Locate handles implementing a protocol.
2009 * This function implements the LocateHandleBuffer service.
2010 * See the Unified Extensible Firmware Interface (UEFI) specification
2013 * @search_type selection criterion
2014 * @protocol GUID of the protocol
2015 * @search_key registration key
2016 * @no_handles number of returned handles
2017 * @buffer buffer with the returned handles
2018 * @return status code
2020 static efi_status_t EFIAPI efi_locate_handle_buffer(
2021 enum efi_locate_search_type search_type,
2022 const efi_guid_t *protocol, void *search_key,
2023 efi_uintn_t *no_handles, efi_handle_t **buffer)
2026 efi_uintn_t buffer_size = 0;
2028 EFI_ENTRY("%d, %pUl, %p, %p, %p", search_type, protocol, search_key,
2029 no_handles, buffer);
2031 if (!no_handles || !buffer) {
2032 r = EFI_INVALID_PARAMETER;
2037 r = efi_locate_handle(search_type, protocol, search_key, &buffer_size,
2039 if (r != EFI_BUFFER_TOO_SMALL)
2041 r = efi_allocate_pool(EFI_ALLOCATE_ANY_PAGES, buffer_size,
2043 if (r != EFI_SUCCESS)
2045 r = efi_locate_handle(search_type, protocol, search_key, &buffer_size,
2047 if (r == EFI_SUCCESS)
2048 *no_handles = buffer_size / sizeof(efi_handle_t);
2054 * Find an interface implementing a protocol.
2056 * This function implements the LocateProtocol service.
2057 * See the Unified Extensible Firmware Interface (UEFI) specification
2060 * @protocol GUID of the protocol
2061 * @registration registration key passed to the notification function
2062 * @protocol_interface interface implementing the protocol
2063 * @return status code
2065 static efi_status_t EFIAPI efi_locate_protocol(const efi_guid_t *protocol,
2067 void **protocol_interface)
2069 struct list_head *lhandle;
2072 EFI_ENTRY("%pUl, %p, %p", protocol, registration, protocol_interface);
2074 if (!protocol || !protocol_interface)
2075 return EFI_EXIT(EFI_INVALID_PARAMETER);
2077 list_for_each(lhandle, &efi_obj_list) {
2078 struct efi_object *efiobj;
2079 struct efi_handler *handler;
2081 efiobj = list_entry(lhandle, struct efi_object, link);
2083 ret = efi_search_protocol(efiobj->handle, protocol, &handler);
2084 if (ret == EFI_SUCCESS) {
2085 *protocol_interface = handler->protocol_interface;
2086 return EFI_EXIT(EFI_SUCCESS);
2089 *protocol_interface = NULL;
2091 return EFI_EXIT(EFI_NOT_FOUND);
2095 * Get the device path and handle of an device implementing a protocol.
2097 * This function implements the LocateDevicePath service.
2098 * See the Unified Extensible Firmware Interface (UEFI) specification
2101 * @protocol GUID of the protocol
2102 * @device_path device path
2103 * @device handle of the device
2104 * @return status code
2106 static efi_status_t EFIAPI efi_locate_device_path(
2107 const efi_guid_t *protocol,
2108 struct efi_device_path **device_path,
2109 efi_handle_t *device)
2111 struct efi_device_path *dp;
2113 struct efi_handler *handler;
2114 efi_handle_t *handles;
2116 size_t len_best = 0;
2117 efi_uintn_t no_handles;
2121 EFI_ENTRY("%pUl, %p, %p", protocol, device_path, device);
2123 if (!protocol || !device_path || !*device_path || !device) {
2124 ret = EFI_INVALID_PARAMETER;
2128 /* Find end of device path */
2129 len = efi_dp_size(*device_path);
2131 /* Get all handles implementing the protocol */
2132 ret = EFI_CALL(efi_locate_handle_buffer(BY_PROTOCOL, protocol, NULL,
2133 &no_handles, &handles));
2134 if (ret != EFI_SUCCESS)
2137 for (i = 0; i < no_handles; ++i) {
2138 /* Find the device path protocol */
2139 ret = efi_search_protocol(handles[i], &efi_guid_device_path,
2141 if (ret != EFI_SUCCESS)
2143 dp = (struct efi_device_path *)handler->protocol_interface;
2144 len_dp = efi_dp_size(dp);
2146 * This handle can only be a better fit
2147 * if its device path length is longer than the best fit and
2148 * if its device path length is shorter of equal the searched
2151 if (len_dp <= len_best || len_dp > len)
2153 /* Check if dp is a subpath of device_path */
2154 if (memcmp(*device_path, dp, len_dp))
2156 *device = handles[i];
2160 remainder = (u8 *)*device_path + len_best;
2161 *device_path = (struct efi_device_path *)remainder;
2164 ret = EFI_NOT_FOUND;
2167 return EFI_EXIT(ret);
2171 * Install multiple protocol interfaces.
2173 * This function implements the MultipleProtocolInterfaces service.
2174 * See the Unified Extensible Firmware Interface (UEFI) specification
2177 * @handle handle on which the protocol interfaces shall be installed
2178 * @... NULL terminated argument list with pairs of protocol GUIDS and
2180 * @return status code
2182 static efi_status_t EFIAPI efi_install_multiple_protocol_interfaces(
2185 EFI_ENTRY("%p", handle);
2188 const efi_guid_t *protocol;
2189 void *protocol_interface;
2190 efi_status_t r = EFI_SUCCESS;
2194 return EFI_EXIT(EFI_INVALID_PARAMETER);
2196 va_start(argptr, handle);
2198 protocol = va_arg(argptr, efi_guid_t*);
2201 protocol_interface = va_arg(argptr, void*);
2202 r = EFI_CALL(efi_install_protocol_interface(
2204 EFI_NATIVE_INTERFACE,
2205 protocol_interface));
2206 if (r != EFI_SUCCESS)
2211 if (r == EFI_SUCCESS)
2214 /* If an error occurred undo all changes. */
2215 va_start(argptr, handle);
2217 protocol = va_arg(argptr, efi_guid_t*);
2218 protocol_interface = va_arg(argptr, void*);
2219 EFI_CALL(efi_uninstall_protocol_interface(handle, protocol,
2220 protocol_interface));
2228 * Uninstall multiple protocol interfaces.
2230 * This function implements the UninstallMultipleProtocolInterfaces service.
2231 * See the Unified Extensible Firmware Interface (UEFI) specification
2234 * @handle handle from which the protocol interfaces shall be removed
2235 * @... NULL terminated argument list with pairs of protocol GUIDS and
2237 * @return status code
2239 static efi_status_t EFIAPI efi_uninstall_multiple_protocol_interfaces(
2242 EFI_ENTRY("%p", handle);
2245 const efi_guid_t *protocol;
2246 void *protocol_interface;
2247 efi_status_t r = EFI_SUCCESS;
2251 return EFI_EXIT(EFI_INVALID_PARAMETER);
2253 va_start(argptr, handle);
2255 protocol = va_arg(argptr, efi_guid_t*);
2258 protocol_interface = va_arg(argptr, void*);
2259 r = EFI_CALL(efi_uninstall_protocol_interface(
2261 protocol_interface));
2262 if (r != EFI_SUCCESS)
2267 if (r == EFI_SUCCESS)
2270 /* If an error occurred undo all changes. */
2271 va_start(argptr, handle);
2273 protocol = va_arg(argptr, efi_guid_t*);
2274 protocol_interface = va_arg(argptr, void*);
2275 EFI_CALL(efi_install_protocol_interface(&handle, protocol,
2276 EFI_NATIVE_INTERFACE,
2277 protocol_interface));
2285 * Calculate cyclic redundancy code.
2287 * This function implements the CalculateCrc32 service.
2288 * See the Unified Extensible Firmware Interface (UEFI) specification
2291 * @data buffer with data
2292 * @data_size size of buffer in bytes
2293 * @crc32_p cyclic redundancy code
2294 * @return status code
2296 static efi_status_t EFIAPI efi_calculate_crc32(void *data,
2297 unsigned long data_size,
2300 EFI_ENTRY("%p, %ld", data, data_size);
2301 *crc32_p = crc32(0, data, data_size);
2302 return EFI_EXIT(EFI_SUCCESS);
2308 * This function implements the CopyMem service.
2309 * See the Unified Extensible Firmware Interface (UEFI) specification
2312 * @destination destination of the copy operation
2313 * @source source of the copy operation
2314 * @length number of bytes to copy
2316 static void EFIAPI efi_copy_mem(void *destination, const void *source,
2319 EFI_ENTRY("%p, %p, %ld", destination, source, (unsigned long)length);
2320 memcpy(destination, source, length);
2321 EFI_EXIT(EFI_SUCCESS);
2325 * Fill memory with a byte value.
2327 * This function implements the SetMem service.
2328 * See the Unified Extensible Firmware Interface (UEFI) specification
2331 * @buffer buffer to fill
2332 * @size size of buffer in bytes
2333 * @value byte to copy to the buffer
2335 static void EFIAPI efi_set_mem(void *buffer, size_t size, uint8_t value)
2337 EFI_ENTRY("%p, %ld, 0x%x", buffer, (unsigned long)size, value);
2338 memset(buffer, value, size);
2339 EFI_EXIT(EFI_SUCCESS);
2343 * Open protocol interface on a handle.
2345 * @handler handler of a protocol
2346 * @protocol_interface interface implementing the protocol
2347 * @agent_handle handle of the driver
2348 * @controller_handle handle of the controller
2349 * @attributes attributes indicating how to open the protocol
2350 * @return status code
2352 static efi_status_t efi_protocol_open(
2353 struct efi_handler *handler,
2354 void **protocol_interface, void *agent_handle,
2355 void *controller_handle, uint32_t attributes)
2357 struct efi_open_protocol_info_item *item;
2358 struct efi_open_protocol_info_entry *match = NULL;
2359 bool opened_by_driver = false;
2360 bool opened_exclusive = false;
2362 /* If there is no agent, only return the interface */
2366 /* For TEST_PROTOCOL ignore interface attribute */
2367 if (attributes != EFI_OPEN_PROTOCOL_TEST_PROTOCOL)
2368 *protocol_interface = NULL;
2371 * Check if the protocol is already opened by a driver with the same
2372 * attributes or opened exclusively
2374 list_for_each_entry(item, &handler->open_infos, link) {
2375 if (item->info.agent_handle == agent_handle) {
2376 if ((attributes & EFI_OPEN_PROTOCOL_BY_DRIVER) &&
2377 (item->info.attributes == attributes))
2378 return EFI_ALREADY_STARTED;
2380 if (item->info.attributes & EFI_OPEN_PROTOCOL_EXCLUSIVE)
2381 opened_exclusive = true;
2384 /* Only one controller can open the protocol exclusively */
2385 if (opened_exclusive && attributes &
2386 (EFI_OPEN_PROTOCOL_EXCLUSIVE | EFI_OPEN_PROTOCOL_BY_DRIVER))
2387 return EFI_ACCESS_DENIED;
2389 /* Prepare exclusive opening */
2390 if (attributes & EFI_OPEN_PROTOCOL_EXCLUSIVE) {
2391 /* Try to disconnect controllers */
2392 list_for_each_entry(item, &handler->open_infos, link) {
2393 if (item->info.attributes ==
2394 EFI_OPEN_PROTOCOL_BY_DRIVER)
2395 EFI_CALL(efi_disconnect_controller(
2396 item->info.controller_handle,
2397 item->info.agent_handle,
2400 opened_by_driver = false;
2401 /* Check if all controllers are disconnected */
2402 list_for_each_entry(item, &handler->open_infos, link) {
2403 if (item->info.attributes & EFI_OPEN_PROTOCOL_BY_DRIVER)
2404 opened_by_driver = true;
2406 /* Only one controller can be conncected */
2407 if (opened_by_driver)
2408 return EFI_ACCESS_DENIED;
2411 /* Find existing entry */
2412 list_for_each_entry(item, &handler->open_infos, link) {
2413 if (item->info.agent_handle == agent_handle &&
2414 item->info.controller_handle == controller_handle)
2415 match = &item->info;
2417 /* None found, create one */
2419 match = efi_create_open_info(handler);
2421 return EFI_OUT_OF_RESOURCES;
2424 match->agent_handle = agent_handle;
2425 match->controller_handle = controller_handle;
2426 match->attributes = attributes;
2427 match->open_count++;
2430 /* For TEST_PROTOCOL ignore interface attribute. */
2431 if (attributes != EFI_OPEN_PROTOCOL_TEST_PROTOCOL)
2432 *protocol_interface = handler->protocol_interface;
2438 * Open protocol interface on a handle.
2440 * This function implements the OpenProtocol interface.
2441 * See the Unified Extensible Firmware Interface (UEFI) specification
2444 * @handle handle on which the protocol shall be opened
2445 * @protocol GUID of the protocol
2446 * @protocol_interface interface implementing the protocol
2447 * @agent_handle handle of the driver
2448 * @controller_handle handle of the controller
2449 * @attributes attributes indicating how to open the protocol
2450 * @return status code
2452 static efi_status_t EFIAPI efi_open_protocol(
2453 void *handle, const efi_guid_t *protocol,
2454 void **protocol_interface, void *agent_handle,
2455 void *controller_handle, uint32_t attributes)
2457 struct efi_handler *handler;
2458 efi_status_t r = EFI_INVALID_PARAMETER;
2460 EFI_ENTRY("%p, %pUl, %p, %p, %p, 0x%x", handle, protocol,
2461 protocol_interface, agent_handle, controller_handle,
2464 if (!handle || !protocol ||
2465 (!protocol_interface && attributes !=
2466 EFI_OPEN_PROTOCOL_TEST_PROTOCOL)) {
2470 switch (attributes) {
2471 case EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL:
2472 case EFI_OPEN_PROTOCOL_GET_PROTOCOL:
2473 case EFI_OPEN_PROTOCOL_TEST_PROTOCOL:
2475 case EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER:
2476 if (controller_handle == handle)
2479 case EFI_OPEN_PROTOCOL_BY_DRIVER:
2480 case EFI_OPEN_PROTOCOL_BY_DRIVER | EFI_OPEN_PROTOCOL_EXCLUSIVE:
2481 /* Check that the controller handle is valid */
2482 if (!efi_search_obj(controller_handle))
2485 case EFI_OPEN_PROTOCOL_EXCLUSIVE:
2486 /* Check that the agent handle is valid */
2487 if (!efi_search_obj(agent_handle))
2494 r = efi_search_protocol(handle, protocol, &handler);
2495 if (r != EFI_SUCCESS)
2498 r = efi_protocol_open(handler, protocol_interface, agent_handle,
2499 controller_handle, attributes);
2505 * Get interface of a protocol on a handle.
2507 * This function implements the HandleProtocol service.
2508 * See the Unified Extensible Firmware Interface (UEFI) specification
2511 * @handle handle on which the protocol shall be opened
2512 * @protocol GUID of the protocol
2513 * @protocol_interface interface implementing the protocol
2514 * @return status code
2516 static efi_status_t EFIAPI efi_handle_protocol(efi_handle_t handle,
2517 const efi_guid_t *protocol,
2518 void **protocol_interface)
2520 return efi_open_protocol(handle, protocol, protocol_interface, NULL,
2521 NULL, EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL);
2524 static efi_status_t efi_bind_controller(
2525 efi_handle_t controller_handle,
2526 efi_handle_t driver_image_handle,
2527 struct efi_device_path *remain_device_path)
2529 struct efi_driver_binding_protocol *binding_protocol;
2532 r = EFI_CALL(efi_open_protocol(driver_image_handle,
2533 &efi_guid_driver_binding_protocol,
2534 (void **)&binding_protocol,
2535 driver_image_handle, NULL,
2536 EFI_OPEN_PROTOCOL_GET_PROTOCOL));
2537 if (r != EFI_SUCCESS)
2539 r = EFI_CALL(binding_protocol->supported(binding_protocol,
2541 remain_device_path));
2542 if (r == EFI_SUCCESS)
2543 r = EFI_CALL(binding_protocol->start(binding_protocol,
2545 remain_device_path));
2546 EFI_CALL(efi_close_protocol(driver_image_handle,
2547 &efi_guid_driver_binding_protocol,
2548 driver_image_handle, NULL));
2552 static efi_status_t efi_connect_single_controller(
2553 efi_handle_t controller_handle,
2554 efi_handle_t *driver_image_handle,
2555 struct efi_device_path *remain_device_path)
2557 efi_handle_t *buffer;
2561 size_t connected = 0;
2563 /* Get buffer with all handles with driver binding protocol */
2564 r = EFI_CALL(efi_locate_handle_buffer(BY_PROTOCOL,
2565 &efi_guid_driver_binding_protocol,
2566 NULL, &count, &buffer));
2567 if (r != EFI_SUCCESS)
2570 /* Context Override */
2571 if (driver_image_handle) {
2572 for (; *driver_image_handle; ++driver_image_handle) {
2573 for (i = 0; i < count; ++i) {
2574 if (buffer[i] == *driver_image_handle) {
2576 r = efi_bind_controller(
2578 *driver_image_handle,
2579 remain_device_path);
2581 * For drivers that do not support the
2582 * controller or are already connected
2583 * we receive an error code here.
2585 if (r == EFI_SUCCESS)
2593 * TODO: Some overrides are not yet implemented:
2594 * - Platform Driver Override
2595 * - Driver Family Override Search
2596 * - Bus Specific Driver Override
2599 /* Driver Binding Search */
2600 for (i = 0; i < count; ++i) {
2602 r = efi_bind_controller(controller_handle,
2604 remain_device_path);
2605 if (r == EFI_SUCCESS)
2610 efi_free_pool(buffer);
2612 return EFI_NOT_FOUND;
2617 * Connect a controller to a driver.
2619 * This function implements the ConnectController service.
2620 * See the Unified Extensible Firmware Interface (UEFI) specification
2623 * First all driver binding protocol handles are tried for binding drivers.
2624 * Afterwards all handles that have openened a protocol of the controller
2625 * with EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER are connected to drivers.
2627 * @controller_handle handle of the controller
2628 * @driver_image_handle handle of the driver
2629 * @remain_device_path device path of a child controller
2630 * @recursive true to connect all child controllers
2631 * @return status code
2633 static efi_status_t EFIAPI efi_connect_controller(
2634 efi_handle_t controller_handle,
2635 efi_handle_t *driver_image_handle,
2636 struct efi_device_path *remain_device_path,
2640 efi_status_t ret = EFI_NOT_FOUND;
2641 struct efi_object *efiobj;
2643 EFI_ENTRY("%p, %p, %p, %d", controller_handle, driver_image_handle,
2644 remain_device_path, recursive);
2646 efiobj = efi_search_obj(controller_handle);
2648 ret = EFI_INVALID_PARAMETER;
2652 r = efi_connect_single_controller(controller_handle,
2653 driver_image_handle,
2654 remain_device_path);
2655 if (r == EFI_SUCCESS)
2658 struct efi_handler *handler;
2659 struct efi_open_protocol_info_item *item;
2661 list_for_each_entry(handler, &efiobj->protocols, link) {
2662 list_for_each_entry(item, &handler->open_infos, link) {
2663 if (item->info.attributes &
2664 EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER) {
2665 r = EFI_CALL(efi_connect_controller(
2666 item->info.controller_handle,
2667 driver_image_handle,
2670 if (r == EFI_SUCCESS)
2676 /* Check for child controller specified by end node */
2677 if (ret != EFI_SUCCESS && remain_device_path &&
2678 remain_device_path->type == DEVICE_PATH_TYPE_END)
2681 return EFI_EXIT(ret);
2685 * Get all child controllers associated to a driver.
2686 * The allocated buffer has to be freed with free().
2688 * @efiobj handle of the controller
2689 * @driver_handle handle of the driver
2690 * @number_of_children number of child controllers
2691 * @child_handle_buffer handles of the the child controllers
2693 static efi_status_t efi_get_child_controllers(
2694 struct efi_object *efiobj,
2695 efi_handle_t driver_handle,
2696 efi_uintn_t *number_of_children,
2697 efi_handle_t **child_handle_buffer)
2699 struct efi_handler *handler;
2700 struct efi_open_protocol_info_item *item;
2701 efi_uintn_t count = 0, i;
2704 /* Count all child controller associations */
2705 list_for_each_entry(handler, &efiobj->protocols, link) {
2706 list_for_each_entry(item, &handler->open_infos, link) {
2707 if (item->info.agent_handle == driver_handle &&
2708 item->info.attributes &
2709 EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER)
2714 * Create buffer. In case of duplicate child controller assignments
2715 * the buffer will be too large. But that does not harm.
2717 *number_of_children = 0;
2718 *child_handle_buffer = calloc(count, sizeof(efi_handle_t));
2719 if (!*child_handle_buffer)
2720 return EFI_OUT_OF_RESOURCES;
2721 /* Copy unique child handles */
2722 list_for_each_entry(handler, &efiobj->protocols, link) {
2723 list_for_each_entry(item, &handler->open_infos, link) {
2724 if (item->info.agent_handle == driver_handle &&
2725 item->info.attributes &
2726 EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER) {
2727 /* Check this is a new child controller */
2729 for (i = 0; i < *number_of_children; ++i) {
2730 if ((*child_handle_buffer)[i] ==
2731 item->info.controller_handle)
2734 /* Copy handle to buffer */
2736 i = (*number_of_children)++;
2737 (*child_handle_buffer)[i] =
2738 item->info.controller_handle;
2747 * Disconnect a controller from a driver.
2749 * This function implements the DisconnectController service.
2750 * See the Unified Extensible Firmware Interface (UEFI) specification
2753 * @controller_handle handle of the controller
2754 * @driver_image_handle handle of the driver
2755 * @child_handle handle of the child to destroy
2756 * @return status code
2758 static efi_status_t EFIAPI efi_disconnect_controller(
2759 efi_handle_t controller_handle,
2760 efi_handle_t driver_image_handle,
2761 efi_handle_t child_handle)
2763 struct efi_driver_binding_protocol *binding_protocol;
2764 efi_handle_t *child_handle_buffer = NULL;
2765 size_t number_of_children = 0;
2767 size_t stop_count = 0;
2768 struct efi_object *efiobj;
2770 EFI_ENTRY("%p, %p, %p", controller_handle, driver_image_handle,
2773 efiobj = efi_search_obj(controller_handle);
2775 r = EFI_INVALID_PARAMETER;
2779 if (child_handle && !efi_search_obj(child_handle)) {
2780 r = EFI_INVALID_PARAMETER;
2784 /* If no driver handle is supplied, disconnect all drivers */
2785 if (!driver_image_handle) {
2786 r = efi_disconnect_all_drivers(efiobj, NULL, child_handle);
2790 /* Create list of child handles */
2792 number_of_children = 1;
2793 child_handle_buffer = &child_handle;
2795 efi_get_child_controllers(efiobj,
2796 driver_image_handle,
2797 &number_of_children,
2798 &child_handle_buffer);
2801 /* Get the driver binding protocol */
2802 r = EFI_CALL(efi_open_protocol(driver_image_handle,
2803 &efi_guid_driver_binding_protocol,
2804 (void **)&binding_protocol,
2805 driver_image_handle, NULL,
2806 EFI_OPEN_PROTOCOL_GET_PROTOCOL));
2807 if (r != EFI_SUCCESS)
2809 /* Remove the children */
2810 if (number_of_children) {
2811 r = EFI_CALL(binding_protocol->stop(binding_protocol,
2814 child_handle_buffer));
2815 if (r == EFI_SUCCESS)
2818 /* Remove the driver */
2820 r = EFI_CALL(binding_protocol->stop(binding_protocol,
2823 if (r == EFI_SUCCESS)
2825 EFI_CALL(efi_close_protocol(driver_image_handle,
2826 &efi_guid_driver_binding_protocol,
2827 driver_image_handle, NULL));
2835 free(child_handle_buffer);
2839 static const struct efi_boot_services efi_boot_services = {
2841 .headersize = sizeof(struct efi_table_hdr),
2843 .raise_tpl = efi_raise_tpl,
2844 .restore_tpl = efi_restore_tpl,
2845 .allocate_pages = efi_allocate_pages_ext,
2846 .free_pages = efi_free_pages_ext,
2847 .get_memory_map = efi_get_memory_map_ext,
2848 .allocate_pool = efi_allocate_pool_ext,
2849 .free_pool = efi_free_pool_ext,
2850 .create_event = efi_create_event_ext,
2851 .set_timer = efi_set_timer_ext,
2852 .wait_for_event = efi_wait_for_event,
2853 .signal_event = efi_signal_event_ext,
2854 .close_event = efi_close_event,
2855 .check_event = efi_check_event,
2856 .install_protocol_interface = efi_install_protocol_interface,
2857 .reinstall_protocol_interface = efi_reinstall_protocol_interface,
2858 .uninstall_protocol_interface = efi_uninstall_protocol_interface,
2859 .handle_protocol = efi_handle_protocol,
2861 .register_protocol_notify = efi_register_protocol_notify,
2862 .locate_handle = efi_locate_handle_ext,
2863 .locate_device_path = efi_locate_device_path,
2864 .install_configuration_table = efi_install_configuration_table_ext,
2865 .load_image = efi_load_image,
2866 .start_image = efi_start_image,
2868 .unload_image = efi_unload_image,
2869 .exit_boot_services = efi_exit_boot_services,
2870 .get_next_monotonic_count = efi_get_next_monotonic_count,
2872 .set_watchdog_timer = efi_set_watchdog_timer,
2873 .connect_controller = efi_connect_controller,
2874 .disconnect_controller = efi_disconnect_controller,
2875 .open_protocol = efi_open_protocol,
2876 .close_protocol = efi_close_protocol,
2877 .open_protocol_information = efi_open_protocol_information,
2878 .protocols_per_handle = efi_protocols_per_handle,
2879 .locate_handle_buffer = efi_locate_handle_buffer,
2880 .locate_protocol = efi_locate_protocol,
2881 .install_multiple_protocol_interfaces = efi_install_multiple_protocol_interfaces,
2882 .uninstall_multiple_protocol_interfaces = efi_uninstall_multiple_protocol_interfaces,
2883 .calculate_crc32 = efi_calculate_crc32,
2884 .copy_mem = efi_copy_mem,
2885 .set_mem = efi_set_mem,
2886 .create_event_ex = efi_create_event_ex,
2890 static uint16_t __efi_runtime_data firmware_vendor[] = L"Das U-Boot";
2892 struct efi_system_table __efi_runtime_data systab = {
2894 .signature = EFI_SYSTEM_TABLE_SIGNATURE,
2895 .revision = 2 << 16 | 70, /* 2.7 */
2896 .headersize = sizeof(struct efi_table_hdr),
2898 .fw_vendor = (long)firmware_vendor,
2899 .con_in = (void*)&efi_con_in,
2900 .con_out = (void*)&efi_con_out,
2901 .std_err = (void*)&efi_con_out,
2902 .runtime = (void*)&efi_runtime_services,
2903 .boottime = (void*)&efi_boot_services,
2905 .tables = (void*)efi_conf_table,