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;
60 /* Called on every callback entry */
61 int __efi_entry_check(void)
63 int ret = entry_count++ == 0;
72 /* Called on every callback exit */
73 int __efi_exit_check(void)
75 int ret = --entry_count == 0;
82 /* Called from do_bootefi_exec() */
83 void efi_save_gd(void)
91 * Special case handler for error/abort that just forces things back
92 * to u-boot world so we can dump out an abort msg, without any care
93 * about returning back to UEFI world.
95 void efi_restore_gd(void)
98 /* Only restore if we're already in EFI context */
106 * Two spaces per indent level, maxing out at 10.. which ought to be
107 * enough for anyone ;-)
109 static const char *indent_string(int level)
111 const char *indent = " ";
112 const int max = strlen(indent);
113 level = min(max, level * 2);
114 return &indent[max - level];
117 const char *__efi_nesting(void)
119 return indent_string(nesting_level);
122 const char *__efi_nesting_inc(void)
124 return indent_string(nesting_level++);
127 const char *__efi_nesting_dec(void)
129 return indent_string(--nesting_level);
133 * Queue an EFI event.
135 * This function queues the notification function of the event for future
138 * The notification function is called if the task priority level of the
139 * event is higher than the current task priority level.
141 * For the SignalEvent service see efi_signal_event_ext.
143 * @event event to signal
145 void efi_signal_event(struct efi_event *event)
147 if (event->notify_function) {
148 event->is_queued = true;
150 if (efi_tpl >= event->notify_tpl)
152 EFI_CALL_VOID(event->notify_function(event,
153 event->notify_context));
155 event->is_queued = false;
159 * Raise the task priority level.
161 * This function implements the RaiseTpl service.
162 * See the Unified Extensible Firmware Interface (UEFI) specification
165 * @new_tpl new value of the task priority level
166 * @return old value of the task priority level
168 static unsigned long EFIAPI efi_raise_tpl(efi_uintn_t new_tpl)
170 efi_uintn_t old_tpl = efi_tpl;
172 EFI_ENTRY("0x%zx", new_tpl);
174 if (new_tpl < efi_tpl)
175 debug("WARNING: new_tpl < current_tpl in %s\n", __func__);
177 if (efi_tpl > TPL_HIGH_LEVEL)
178 efi_tpl = TPL_HIGH_LEVEL;
180 EFI_EXIT(EFI_SUCCESS);
185 * Lower the task priority level.
187 * This function implements the RestoreTpl service.
188 * See the Unified Extensible Firmware Interface (UEFI) specification
191 * @old_tpl value of the task priority level to be restored
193 static void EFIAPI efi_restore_tpl(efi_uintn_t old_tpl)
195 EFI_ENTRY("0x%zx", old_tpl);
197 if (old_tpl > efi_tpl)
198 debug("WARNING: old_tpl > current_tpl in %s\n", __func__);
200 if (efi_tpl > TPL_HIGH_LEVEL)
201 efi_tpl = TPL_HIGH_LEVEL;
203 EFI_EXIT(EFI_SUCCESS);
207 * Allocate memory pages.
209 * This function implements the AllocatePages service.
210 * See the Unified Extensible Firmware Interface (UEFI) specification
213 * @type type of allocation to be performed
214 * @memory_type usage type of the allocated memory
215 * @pages number of pages to be allocated
216 * @memory allocated memory
217 * @return status code
219 static efi_status_t EFIAPI efi_allocate_pages_ext(int type, int memory_type,
225 EFI_ENTRY("%d, %d, 0x%zx, %p", type, memory_type, pages, memory);
226 r = efi_allocate_pages(type, memory_type, pages, memory);
233 * This function implements the FreePages service.
234 * See the Unified Extensible Firmware Interface (UEFI) specification
237 * @memory start of the memory area to be freed
238 * @pages number of pages to be freed
239 * @return status code
241 static efi_status_t EFIAPI efi_free_pages_ext(uint64_t memory,
246 EFI_ENTRY("%"PRIx64", 0x%zx", memory, pages);
247 r = efi_free_pages(memory, pages);
252 * Get map describing memory usage.
254 * This function implements the GetMemoryMap service.
255 * See the Unified Extensible Firmware Interface (UEFI) specification
258 * @memory_map_size on entry the size, in bytes, of the memory map buffer,
259 * on exit the size of the copied memory map
260 * @memory_map buffer to which the memory map is written
261 * @map_key key for the memory map
262 * @descriptor_size size of an individual memory descriptor
263 * @descriptor_version version number of the memory descriptor structure
264 * @return status code
266 static efi_status_t EFIAPI efi_get_memory_map_ext(
267 efi_uintn_t *memory_map_size,
268 struct efi_mem_desc *memory_map,
269 efi_uintn_t *map_key,
270 efi_uintn_t *descriptor_size,
271 uint32_t *descriptor_version)
275 EFI_ENTRY("%p, %p, %p, %p, %p", memory_map_size, memory_map,
276 map_key, descriptor_size, descriptor_version);
277 r = efi_get_memory_map(memory_map_size, memory_map, map_key,
278 descriptor_size, descriptor_version);
283 * Allocate memory from pool.
285 * This function implements the AllocatePool service.
286 * See the Unified Extensible Firmware Interface (UEFI) specification
289 * @pool_type type of the pool from which memory is to be allocated
290 * @size number of bytes to be allocated
291 * @buffer allocated memory
292 * @return status code
294 static efi_status_t EFIAPI efi_allocate_pool_ext(int pool_type,
300 EFI_ENTRY("%d, %zd, %p", pool_type, size, buffer);
301 r = efi_allocate_pool(pool_type, size, buffer);
306 * Free memory from pool.
308 * This function implements the FreePool service.
309 * See the Unified Extensible Firmware Interface (UEFI) specification
312 * @buffer start of memory to be freed
313 * @return status code
315 static efi_status_t EFIAPI efi_free_pool_ext(void *buffer)
319 EFI_ENTRY("%p", buffer);
320 r = efi_free_pool(buffer);
325 * Add a new object to the object list.
327 * The protocols list is initialized.
328 * The object handle is set.
330 * @obj object to be added
332 void efi_add_handle(struct efi_object *obj)
336 INIT_LIST_HEAD(&obj->protocols);
338 list_add_tail(&obj->link, &efi_obj_list);
345 * @return status code
347 efi_status_t efi_create_handle(void **handle)
349 struct efi_object *obj;
352 r = efi_allocate_pool(EFI_ALLOCATE_ANY_PAGES,
353 sizeof(struct efi_object),
355 if (r != EFI_SUCCESS)
358 *handle = obj->handle;
363 * Find a protocol on a handle.
366 * @protocol_guid GUID of the protocol
367 * @handler reference to the protocol
368 * @return status code
370 efi_status_t efi_search_protocol(const void *handle,
371 const efi_guid_t *protocol_guid,
372 struct efi_handler **handler)
374 struct efi_object *efiobj;
375 struct list_head *lhandle;
377 if (!handle || !protocol_guid)
378 return EFI_INVALID_PARAMETER;
379 efiobj = efi_search_obj(handle);
381 return EFI_INVALID_PARAMETER;
382 list_for_each(lhandle, &efiobj->protocols) {
383 struct efi_handler *protocol;
385 protocol = list_entry(lhandle, struct efi_handler, link);
386 if (!guidcmp(protocol->guid, protocol_guid)) {
392 return EFI_NOT_FOUND;
396 * Delete protocol from a handle.
398 * @handle handle from which the protocol shall be deleted
399 * @protocol GUID of the protocol to be deleted
400 * @protocol_interface interface of the protocol implementation
401 * @return status code
403 efi_status_t efi_remove_protocol(const void *handle, const efi_guid_t *protocol,
404 void *protocol_interface)
406 struct efi_handler *handler;
409 ret = efi_search_protocol(handle, protocol, &handler);
410 if (ret != EFI_SUCCESS)
412 if (guidcmp(handler->guid, protocol))
413 return EFI_INVALID_PARAMETER;
414 list_del(&handler->link);
420 * Delete all protocols from a handle.
422 * @handle handle from which the protocols shall be deleted
423 * @return status code
425 efi_status_t efi_remove_all_protocols(const void *handle)
427 struct efi_object *efiobj;
428 struct efi_handler *protocol;
429 struct efi_handler *pos;
431 efiobj = efi_search_obj(handle);
433 return EFI_INVALID_PARAMETER;
434 list_for_each_entry_safe(protocol, pos, &efiobj->protocols, link) {
437 ret = efi_remove_protocol(handle, protocol->guid,
438 protocol->protocol_interface);
439 if (ret != EFI_SUCCESS)
448 * @handle handle to delete
450 void efi_delete_handle(struct efi_object *obj)
454 efi_remove_all_protocols(obj->handle);
455 list_del(&obj->link);
460 * Our event capabilities are very limited. Only a small limited
461 * number of events is allowed to coexist.
463 static struct efi_event efi_events[16];
468 * This function is used inside U-Boot code to create an event.
470 * For the API function implementing the CreateEvent service see
471 * efi_create_event_ext.
473 * @type type of the event to create
474 * @notify_tpl task priority level of the event
475 * @notify_function notification function of the event
476 * @notify_context pointer passed to the notification function
477 * @event created event
478 * @return status code
480 efi_status_t efi_create_event(uint32_t type, efi_uintn_t notify_tpl,
481 void (EFIAPI *notify_function) (
482 struct efi_event *event,
484 void *notify_context, struct efi_event **event)
489 return EFI_INVALID_PARAMETER;
491 if ((type & EVT_NOTIFY_SIGNAL) && (type & EVT_NOTIFY_WAIT))
492 return EFI_INVALID_PARAMETER;
494 if ((type & (EVT_NOTIFY_SIGNAL|EVT_NOTIFY_WAIT)) &&
495 notify_function == NULL)
496 return EFI_INVALID_PARAMETER;
498 for (i = 0; i < ARRAY_SIZE(efi_events); ++i) {
499 if (efi_events[i].type)
501 efi_events[i].type = type;
502 efi_events[i].notify_tpl = notify_tpl;
503 efi_events[i].notify_function = notify_function;
504 efi_events[i].notify_context = notify_context;
505 /* Disable timers on bootup */
506 efi_events[i].trigger_next = -1ULL;
507 efi_events[i].is_queued = false;
508 efi_events[i].is_signaled = false;
509 *event = &efi_events[i];
512 return EFI_OUT_OF_RESOURCES;
518 * This function implements the CreateEvent service.
519 * See the Unified Extensible Firmware Interface (UEFI) specification
522 * @type type of the event to create
523 * @notify_tpl task priority level of the event
524 * @notify_function notification function of the event
525 * @notify_context pointer passed to the notification function
526 * @event created event
527 * @return status code
529 static efi_status_t EFIAPI efi_create_event_ext(
530 uint32_t type, efi_uintn_t notify_tpl,
531 void (EFIAPI *notify_function) (
532 struct efi_event *event,
534 void *notify_context, struct efi_event **event)
536 EFI_ENTRY("%d, 0x%zx, %p, %p", type, notify_tpl, notify_function,
538 return EFI_EXIT(efi_create_event(type, notify_tpl, notify_function,
539 notify_context, event));
544 * Check if a timer event has occurred or a queued notification function should
547 * Our timers have to work without interrupts, so we check whenever keyboard
548 * input or disk accesses happen if enough time elapsed for them to fire.
550 void efi_timer_check(void)
553 u64 now = timer_get_us();
555 for (i = 0; i < ARRAY_SIZE(efi_events); ++i) {
556 if (!efi_events[i].type)
558 if (efi_events[i].is_queued)
559 efi_signal_event(&efi_events[i]);
560 if (!(efi_events[i].type & EVT_TIMER) ||
561 now < efi_events[i].trigger_next)
563 switch (efi_events[i].trigger_type) {
564 case EFI_TIMER_RELATIVE:
565 efi_events[i].trigger_type = EFI_TIMER_STOP;
567 case EFI_TIMER_PERIODIC:
568 efi_events[i].trigger_next +=
569 efi_events[i].trigger_time;
574 efi_events[i].is_signaled = true;
575 efi_signal_event(&efi_events[i]);
581 * Set the trigger time for a timer event or stop the event.
583 * This is the function for internal usage in U-Boot. For the API function
584 * implementing the SetTimer service see efi_set_timer_ext.
586 * @event event for which the timer is set
587 * @type type of the timer
588 * @trigger_time trigger period in multiples of 100ns
589 * @return status code
591 efi_status_t efi_set_timer(struct efi_event *event, enum efi_timer_delay type,
592 uint64_t trigger_time)
597 * The parameter defines a multiple of 100ns.
598 * We use multiples of 1000ns. So divide by 10.
600 do_div(trigger_time, 10);
602 for (i = 0; i < ARRAY_SIZE(efi_events); ++i) {
603 if (event != &efi_events[i])
606 if (!(event->type & EVT_TIMER))
610 event->trigger_next = -1ULL;
612 case EFI_TIMER_PERIODIC:
613 case EFI_TIMER_RELATIVE:
614 event->trigger_next =
615 timer_get_us() + trigger_time;
618 return EFI_INVALID_PARAMETER;
620 event->trigger_type = type;
621 event->trigger_time = trigger_time;
622 event->is_signaled = false;
625 return EFI_INVALID_PARAMETER;
629 * Set the trigger time for a timer event or stop the event.
631 * This function implements the SetTimer service.
632 * See the Unified Extensible Firmware Interface (UEFI) specification
635 * @event event for which the timer is set
636 * @type type of the timer
637 * @trigger_time trigger period in multiples of 100ns
638 * @return status code
640 static efi_status_t EFIAPI efi_set_timer_ext(struct efi_event *event,
641 enum efi_timer_delay type,
642 uint64_t trigger_time)
644 EFI_ENTRY("%p, %d, %"PRIx64, event, type, trigger_time);
645 return EFI_EXIT(efi_set_timer(event, type, trigger_time));
649 * Wait for events to be signaled.
651 * This function implements the WaitForEvent service.
652 * See the Unified Extensible Firmware Interface (UEFI) specification
655 * @num_events number of events to be waited for
656 * @events events to be waited for
657 * @index index of the event that was signaled
658 * @return status code
660 static efi_status_t EFIAPI efi_wait_for_event(efi_uintn_t num_events,
661 struct efi_event **event,
666 EFI_ENTRY("%zd, %p, %p", num_events, event, index);
668 /* Check parameters */
669 if (!num_events || !event)
670 return EFI_EXIT(EFI_INVALID_PARAMETER);
672 if (efi_tpl != TPL_APPLICATION)
673 return EFI_EXIT(EFI_UNSUPPORTED);
674 for (i = 0; i < num_events; ++i) {
675 for (j = 0; j < ARRAY_SIZE(efi_events); ++j) {
676 if (event[i] == &efi_events[j])
679 return EFI_EXIT(EFI_INVALID_PARAMETER);
681 if (!event[i]->type || event[i]->type & EVT_NOTIFY_SIGNAL)
682 return EFI_EXIT(EFI_INVALID_PARAMETER);
683 if (!event[i]->is_signaled)
684 efi_signal_event(event[i]);
687 /* Wait for signal */
689 for (i = 0; i < num_events; ++i) {
690 if (event[i]->is_signaled)
693 /* Allow events to occur. */
699 * Reset the signal which is passed to the caller to allow periodic
702 event[i]->is_signaled = false;
706 return EFI_EXIT(EFI_SUCCESS);
710 * Signal an EFI event.
712 * This function implements the SignalEvent service.
713 * See the Unified Extensible Firmware Interface (UEFI) specification
716 * This functions sets the signaled state of the event and queues the
717 * notification function for execution.
719 * @event event to signal
720 * @return status code
722 static efi_status_t EFIAPI efi_signal_event_ext(struct efi_event *event)
726 EFI_ENTRY("%p", event);
727 for (i = 0; i < ARRAY_SIZE(efi_events); ++i) {
728 if (event != &efi_events[i])
730 if (event->is_signaled)
732 event->is_signaled = true;
733 if (event->type & EVT_NOTIFY_SIGNAL)
734 efi_signal_event(event);
737 return EFI_EXIT(EFI_SUCCESS);
741 * Close an EFI event.
743 * This function implements the CloseEvent service.
744 * See the Unified Extensible Firmware Interface (UEFI) specification
747 * @event event to close
748 * @return status code
750 static efi_status_t EFIAPI efi_close_event(struct efi_event *event)
754 EFI_ENTRY("%p", event);
755 for (i = 0; i < ARRAY_SIZE(efi_events); ++i) {
756 if (event == &efi_events[i]) {
758 event->trigger_next = -1ULL;
759 event->is_queued = false;
760 event->is_signaled = false;
761 return EFI_EXIT(EFI_SUCCESS);
764 return EFI_EXIT(EFI_INVALID_PARAMETER);
768 * Check if an event is signaled.
770 * This function implements the CheckEvent service.
771 * See the Unified Extensible Firmware Interface (UEFI) specification
774 * If an event is not signaled yet the notification function is queued.
776 * @event event to check
777 * @return status code
779 static efi_status_t EFIAPI efi_check_event(struct efi_event *event)
783 EFI_ENTRY("%p", event);
785 for (i = 0; i < ARRAY_SIZE(efi_events); ++i) {
786 if (event != &efi_events[i])
788 if (!event->type || event->type & EVT_NOTIFY_SIGNAL)
790 if (!event->is_signaled)
791 efi_signal_event(event);
792 if (event->is_signaled)
793 return EFI_EXIT(EFI_SUCCESS);
794 return EFI_EXIT(EFI_NOT_READY);
796 return EFI_EXIT(EFI_INVALID_PARAMETER);
800 * Find the internal EFI object for a handle.
802 * @handle handle to find
805 struct efi_object *efi_search_obj(const void *handle)
807 struct efi_object *efiobj;
809 list_for_each_entry(efiobj, &efi_obj_list, link) {
810 if (efiobj->handle == handle)
818 * Install new protocol on a handle.
820 * @handle handle on which the protocol shall be installed
821 * @protocol GUID of the protocol to be installed
822 * @protocol_interface interface of the protocol implementation
823 * @return status code
825 efi_status_t efi_add_protocol(const void *handle, const efi_guid_t *protocol,
826 void *protocol_interface)
828 struct efi_object *efiobj;
829 struct efi_handler *handler;
832 efiobj = efi_search_obj(handle);
834 return EFI_INVALID_PARAMETER;
835 ret = efi_search_protocol(handle, protocol, NULL);
836 if (ret != EFI_NOT_FOUND)
837 return EFI_INVALID_PARAMETER;
838 handler = calloc(1, sizeof(struct efi_handler));
840 return EFI_OUT_OF_RESOURCES;
841 handler->guid = protocol;
842 handler->protocol_interface = protocol_interface;
843 list_add_tail(&handler->link, &efiobj->protocols);
848 * Install protocol interface.
850 * This function implements the InstallProtocolInterface service.
851 * See the Unified Extensible Firmware Interface (UEFI) specification
854 * @handle handle on which the protocol shall be installed
855 * @protocol GUID of the protocol to be installed
856 * @protocol_interface_type type of the interface to be installed,
857 * always EFI_NATIVE_INTERFACE
858 * @protocol_interface interface of the protocol implementation
859 * @return status code
861 static efi_status_t EFIAPI efi_install_protocol_interface(
862 void **handle, const efi_guid_t *protocol,
863 int protocol_interface_type, void *protocol_interface)
867 EFI_ENTRY("%p, %pUl, %d, %p", handle, protocol, protocol_interface_type,
870 if (!handle || !protocol ||
871 protocol_interface_type != EFI_NATIVE_INTERFACE) {
872 r = EFI_INVALID_PARAMETER;
876 /* Create new handle if requested. */
878 r = efi_create_handle(handle);
879 if (r != EFI_SUCCESS)
881 debug("%sEFI: new handle %p\n", indent_string(nesting_level),
884 debug("%sEFI: handle %p\n", indent_string(nesting_level),
887 /* Add new protocol */
888 r = efi_add_protocol(*handle, protocol, protocol_interface);
894 * Reinstall protocol interface.
896 * This function implements the ReinstallProtocolInterface service.
897 * See the Unified Extensible Firmware Interface (UEFI) specification
900 * @handle handle on which the protocol shall be
902 * @protocol GUID of the protocol to be installed
903 * @old_interface interface to be removed
904 * @new_interface interface to be installed
905 * @return status code
907 static efi_status_t EFIAPI efi_reinstall_protocol_interface(void *handle,
908 const efi_guid_t *protocol, void *old_interface,
911 EFI_ENTRY("%p, %pUl, %p, %p", handle, protocol, old_interface,
913 return EFI_EXIT(EFI_ACCESS_DENIED);
917 * Uninstall protocol interface.
919 * This function implements the UninstallProtocolInterface service.
920 * See the Unified Extensible Firmware Interface (UEFI) specification
923 * @handle handle from which the protocol shall be removed
924 * @protocol GUID of the protocol to be removed
925 * @protocol_interface interface to be removed
926 * @return status code
928 static efi_status_t EFIAPI efi_uninstall_protocol_interface(
929 void *handle, const efi_guid_t *protocol,
930 void *protocol_interface)
932 struct efi_handler *handler;
935 EFI_ENTRY("%p, %pUl, %p", handle, protocol, protocol_interface);
937 if (!handle || !protocol) {
938 r = EFI_INVALID_PARAMETER;
942 /* Find the protocol on the handle */
943 r = efi_search_protocol(handle, protocol, &handler);
944 if (r != EFI_SUCCESS)
946 if (handler->protocol_interface) {
947 /* TODO disconnect controllers */
948 r = EFI_ACCESS_DENIED;
950 r = efi_remove_protocol(handle, protocol, protocol_interface);
957 * Register an event for notification when a protocol is installed.
959 * This function implements the RegisterProtocolNotify service.
960 * See the Unified Extensible Firmware Interface (UEFI) specification
963 * @protocol GUID of the protocol whose installation shall be
965 * @event event to be signaled upon installation of the protocol
966 * @registration key for retrieving the registration information
967 * @return status code
969 static efi_status_t EFIAPI efi_register_protocol_notify(
970 const efi_guid_t *protocol,
971 struct efi_event *event,
974 EFI_ENTRY("%pUl, %p, %p", protocol, event, registration);
975 return EFI_EXIT(EFI_OUT_OF_RESOURCES);
979 * Determine if an EFI handle implements a protocol.
981 * See the documentation of the LocateHandle service in the UEFI specification.
983 * @search_type selection criterion
984 * @protocol GUID of the protocol
985 * @search_key registration key
987 * @return 0 if the handle implements the protocol
989 static int efi_search(enum efi_locate_search_type search_type,
990 const efi_guid_t *protocol, void *search_key,
991 struct efi_object *efiobj)
995 switch (search_type) {
998 case BY_REGISTER_NOTIFY:
999 /* TODO: RegisterProtocolNotify is not implemented yet */
1002 ret = efi_search_protocol(efiobj->handle, protocol, NULL);
1003 return (ret != EFI_SUCCESS);
1005 /* Invalid search type */
1011 * Locate handles implementing a protocol.
1013 * This function is meant for U-Boot internal calls. For the API implementation
1014 * of the LocateHandle service see efi_locate_handle_ext.
1016 * @search_type selection criterion
1017 * @protocol GUID of the protocol
1018 * @search_key registration key
1019 * @buffer_size size of the buffer to receive the handles in bytes
1020 * @buffer buffer to receive the relevant handles
1021 * @return status code
1023 static efi_status_t efi_locate_handle(
1024 enum efi_locate_search_type search_type,
1025 const efi_guid_t *protocol, void *search_key,
1026 efi_uintn_t *buffer_size, efi_handle_t *buffer)
1028 struct efi_object *efiobj;
1029 efi_uintn_t size = 0;
1031 /* Check parameters */
1032 switch (search_type) {
1035 case BY_REGISTER_NOTIFY:
1037 return EFI_INVALID_PARAMETER;
1038 /* RegisterProtocolNotify is not implemented yet */
1039 return EFI_UNSUPPORTED;
1042 return EFI_INVALID_PARAMETER;
1045 return EFI_INVALID_PARAMETER;
1049 * efi_locate_handle_buffer uses this function for
1050 * the calculation of the necessary buffer size.
1051 * So do not require a buffer for buffersize == 0.
1053 if (!buffer_size || (*buffer_size && !buffer))
1054 return EFI_INVALID_PARAMETER;
1056 /* Count how much space we need */
1057 list_for_each_entry(efiobj, &efi_obj_list, link) {
1058 if (!efi_search(search_type, protocol, search_key, efiobj))
1059 size += sizeof(void*);
1062 if (*buffer_size < size) {
1063 *buffer_size = size;
1064 return EFI_BUFFER_TOO_SMALL;
1067 *buffer_size = size;
1069 return EFI_NOT_FOUND;
1071 /* Then fill the array */
1072 list_for_each_entry(efiobj, &efi_obj_list, link) {
1073 if (!efi_search(search_type, protocol, search_key, efiobj))
1074 *buffer++ = efiobj->handle;
1081 * Locate handles implementing a protocol.
1083 * This function implements the LocateHandle service.
1084 * See the Unified Extensible Firmware Interface (UEFI) specification
1087 * @search_type selection criterion
1088 * @protocol GUID of the protocol
1089 * @search_key registration key
1090 * @buffer_size size of the buffer to receive the handles in bytes
1091 * @buffer buffer to receive the relevant handles
1092 * @return 0 if the handle implements the protocol
1094 static efi_status_t EFIAPI efi_locate_handle_ext(
1095 enum efi_locate_search_type search_type,
1096 const efi_guid_t *protocol, void *search_key,
1097 efi_uintn_t *buffer_size, efi_handle_t *buffer)
1099 EFI_ENTRY("%d, %pUl, %p, %p, %p", search_type, protocol, search_key,
1100 buffer_size, buffer);
1102 return EFI_EXIT(efi_locate_handle(search_type, protocol, search_key,
1103 buffer_size, buffer));
1106 /* Collapses configuration table entries, removing index i */
1107 static void efi_remove_configuration_table(int i)
1109 struct efi_configuration_table *this = &efi_conf_table[i];
1110 struct efi_configuration_table *next = &efi_conf_table[i+1];
1111 struct efi_configuration_table *end = &efi_conf_table[systab.nr_tables];
1113 memmove(this, next, (ulong)end - (ulong)next);
1118 * Adds, updates, or removes a configuration table.
1120 * This function is used for internal calls. For the API implementation of the
1121 * InstallConfigurationTable service see efi_install_configuration_table_ext.
1123 * @guid GUID of the installed table
1124 * @table table to be installed
1125 * @return status code
1127 efi_status_t efi_install_configuration_table(const efi_guid_t *guid, void *table)
1131 /* Check for guid override */
1132 for (i = 0; i < systab.nr_tables; i++) {
1133 if (!guidcmp(guid, &efi_conf_table[i].guid)) {
1135 efi_conf_table[i].table = table;
1137 efi_remove_configuration_table(i);
1143 return EFI_NOT_FOUND;
1145 /* No override, check for overflow */
1146 if (i >= ARRAY_SIZE(efi_conf_table))
1147 return EFI_OUT_OF_RESOURCES;
1149 /* Add a new entry */
1150 memcpy(&efi_conf_table[i].guid, guid, sizeof(*guid));
1151 efi_conf_table[i].table = table;
1152 systab.nr_tables = i + 1;
1158 * Adds, updates, or removes a configuration table.
1160 * This function implements the InstallConfigurationTable service.
1161 * See the Unified Extensible Firmware Interface (UEFI) specification
1164 * @guid GUID of the installed table
1165 * @table table to be installed
1166 * @return status code
1168 static efi_status_t EFIAPI efi_install_configuration_table_ext(efi_guid_t *guid,
1171 EFI_ENTRY("%pUl, %p", guid, table);
1172 return EFI_EXIT(efi_install_configuration_table(guid, table));
1176 * Initialize a loaded_image_info + loaded_image_info object with correct
1177 * protocols, boot-device, etc.
1179 * @info loaded image info to be passed to the entry point of the
1181 * @obj internal object associated with the loaded image
1182 * @device_path device path of the loaded image
1183 * @file_path file path of the loaded image
1184 * @return status code
1186 efi_status_t efi_setup_loaded_image(
1187 struct efi_loaded_image *info, struct efi_object *obj,
1188 struct efi_device_path *device_path,
1189 struct efi_device_path *file_path)
1193 /* Add internal object to object list */
1194 efi_add_handle(obj);
1195 /* efi_exit() assumes that the handle points to the info */
1198 info->file_path = file_path;
1200 info->device_handle = efi_dp_find_obj(device_path, NULL);
1203 * When asking for the device path interface, return
1204 * bootefi_device_path
1206 ret = efi_add_protocol(obj->handle, &efi_guid_device_path, device_path);
1207 if (ret != EFI_SUCCESS)
1211 * When asking for the loaded_image interface, just
1212 * return handle which points to loaded_image_info
1214 ret = efi_add_protocol(obj->handle, &efi_guid_loaded_image, info);
1215 if (ret != EFI_SUCCESS)
1218 ret = efi_add_protocol(obj->handle, &efi_guid_console_control,
1219 (void *)&efi_console_control);
1220 if (ret != EFI_SUCCESS)
1223 ret = efi_add_protocol(obj->handle,
1224 &efi_guid_device_path_to_text_protocol,
1225 (void *)&efi_device_path_to_text);
1226 if (ret != EFI_SUCCESS)
1231 printf("ERROR: Failure to install protocols for loaded image\n");
1236 * Load an image using a file path.
1238 * @file_path the path of the image to load
1239 * @buffer buffer containing the loaded image
1240 * @return status code
1242 efi_status_t efi_load_image_from_path(struct efi_device_path *file_path,
1245 struct efi_file_info *info = NULL;
1246 struct efi_file_handle *f;
1247 static efi_status_t ret;
1250 f = efi_file_from_path(file_path);
1252 return EFI_DEVICE_ERROR;
1255 EFI_CALL(ret = f->getinfo(f, (efi_guid_t *)&efi_file_info_guid,
1257 if (ret == EFI_BUFFER_TOO_SMALL) {
1259 EFI_CALL(ret = f->getinfo(f, (efi_guid_t *)&efi_file_info_guid,
1262 if (ret != EFI_SUCCESS)
1265 ret = efi_allocate_pool(EFI_LOADER_DATA, info->file_size, buffer);
1269 EFI_CALL(ret = f->read(f, &info->file_size, *buffer));
1273 EFI_CALL(f->close(f));
1275 if (ret != EFI_SUCCESS) {
1276 efi_free_pool(*buffer);
1284 * Load an EFI image into memory.
1286 * This function implements the LoadImage service.
1287 * See the Unified Extensible Firmware Interface (UEFI) specification
1290 * @boot_policy true for request originating from the boot manager
1291 * @parent_image the calles's image handle
1292 * @file_path the path of the image to load
1293 * @source_buffer memory location from which the image is installed
1294 * @source_size size of the memory area from which the image is
1296 * @image_handle handle for the newly installed image
1297 * @return status code
1299 static efi_status_t EFIAPI efi_load_image(bool boot_policy,
1300 efi_handle_t parent_image,
1301 struct efi_device_path *file_path,
1302 void *source_buffer,
1303 unsigned long source_size,
1304 efi_handle_t *image_handle)
1306 struct efi_loaded_image *info;
1307 struct efi_object *obj;
1310 EFI_ENTRY("%d, %p, %p, %p, %ld, %p", boot_policy, parent_image,
1311 file_path, source_buffer, source_size, image_handle);
1313 info = calloc(1, sizeof(*info));
1314 obj = calloc(1, sizeof(*obj));
1316 if (!source_buffer) {
1317 struct efi_device_path *dp, *fp;
1319 ret = efi_load_image_from_path(file_path, &source_buffer);
1320 if (ret != EFI_SUCCESS)
1323 * split file_path which contains both the device and
1326 efi_dp_split_file_path(file_path, &dp, &fp);
1327 ret = efi_setup_loaded_image(info, obj, dp, fp);
1328 if (ret != EFI_SUCCESS)
1331 /* In this case, file_path is the "device" path, ie.
1332 * something like a HARDWARE_DEVICE:MEMORY_MAPPED
1334 ret = efi_setup_loaded_image(info, obj, file_path, NULL);
1335 if (ret != EFI_SUCCESS)
1338 info->reserved = efi_load_pe(source_buffer, info);
1339 if (!info->reserved) {
1340 ret = EFI_UNSUPPORTED;
1343 info->system_table = &systab;
1344 info->parent_handle = parent_image;
1345 *image_handle = obj->handle;
1346 return EFI_EXIT(EFI_SUCCESS);
1349 efi_delete_handle(obj);
1350 return EFI_EXIT(ret);
1354 * Call the entry point of an image.
1356 * This function implements the StartImage service.
1357 * See the Unified Extensible Firmware Interface (UEFI) specification
1360 * @image_handle handle of the image
1361 * @exit_data_size size of the buffer
1362 * @exit_data buffer to receive the exit data of the called image
1363 * @return status code
1365 static efi_status_t EFIAPI efi_start_image(efi_handle_t image_handle,
1366 unsigned long *exit_data_size,
1369 ulong (*entry)(void *image_handle, struct efi_system_table *st);
1370 struct efi_loaded_image *info = image_handle;
1373 EFI_ENTRY("%p, %p, %p", image_handle, exit_data_size, exit_data);
1374 entry = info->reserved;
1376 efi_is_direct_boot = false;
1378 /* call the image! */
1379 if (setjmp(&info->exit_jmp)) {
1381 * We called the entry point of the child image with EFI_CALL
1382 * in the lines below. The child image called the Exit() boot
1383 * service efi_exit() which executed the long jump that brought
1384 * us to the current line. This implies that the second half
1385 * of the EFI_CALL macro has not been executed.
1389 * efi_exit() called efi_restore_gd(). We have to undo this
1390 * otherwise __efi_entry_check() will put the wrong value into
1396 * To get ready to call EFI_EXIT below we have to execute the
1397 * missed out steps of EFI_CALL.
1399 assert(__efi_entry_check());
1400 debug("%sEFI: %lu returned by started image\n",
1401 __efi_nesting_dec(),
1402 (unsigned long)((uintptr_t)info->exit_status &
1404 return EFI_EXIT(info->exit_status);
1407 ret = EFI_CALL(entry(image_handle, &systab));
1409 /* Should usually never get here */
1410 return EFI_EXIT(ret);
1414 * Leave an EFI application or driver.
1416 * This function implements the Exit service.
1417 * See the Unified Extensible Firmware Interface (UEFI) specification
1420 * @image_handle handle of the application or driver that is exiting
1421 * @exit_status status code
1422 * @exit_data_size size of the buffer in bytes
1423 * @exit_data buffer with data describing an error
1424 * @return status code
1426 static efi_status_t EFIAPI efi_exit(efi_handle_t image_handle,
1427 efi_status_t exit_status, unsigned long exit_data_size,
1431 * We require that the handle points to the original loaded
1432 * image protocol interface.
1434 * For getting the longjmp address this is safer than locating
1435 * the protocol because the protocol may have been reinstalled
1436 * pointing to another memory location.
1438 * TODO: We should call the unload procedure of the loaded
1441 struct efi_loaded_image *loaded_image_info = (void*)image_handle;
1443 EFI_ENTRY("%p, %ld, %ld, %p", image_handle, exit_status,
1444 exit_data_size, exit_data);
1446 /* Make sure entry/exit counts for EFI world cross-overs match */
1447 EFI_EXIT(exit_status);
1450 * But longjmp out with the U-Boot gd, not the application's, as
1451 * the other end is a setjmp call inside EFI context.
1455 loaded_image_info->exit_status = exit_status;
1456 longjmp(&loaded_image_info->exit_jmp, 1);
1458 panic("EFI application exited");
1462 * Unload an EFI image.
1464 * This function implements the UnloadImage service.
1465 * See the Unified Extensible Firmware Interface (UEFI) specification
1468 * @image_handle handle of the image to be unloaded
1469 * @return status code
1471 static efi_status_t EFIAPI efi_unload_image(void *image_handle)
1473 struct efi_object *efiobj;
1475 EFI_ENTRY("%p", image_handle);
1476 efiobj = efi_search_obj(image_handle);
1478 list_del(&efiobj->link);
1480 return EFI_EXIT(EFI_SUCCESS);
1484 * Fix up caches for EFI payloads if necessary.
1486 static void efi_exit_caches(void)
1488 #if defined(CONFIG_ARM) && !defined(CONFIG_ARM64)
1490 * Grub on 32bit ARM needs to have caches disabled before jumping into
1491 * a zImage, but does not know of all cache layers. Give it a hand.
1493 if (efi_is_direct_boot)
1494 cleanup_before_linux();
1499 * Stop boot services.
1501 * This function implements the ExitBootServices service.
1502 * See the Unified Extensible Firmware Interface (UEFI) specification
1505 * @image_handle handle of the loaded image
1506 * @map_key key of the memory map
1507 * @return status code
1509 static efi_status_t EFIAPI efi_exit_boot_services(void *image_handle,
1510 unsigned long map_key)
1514 EFI_ENTRY("%p, %ld", image_handle, map_key);
1516 /* Notify that ExitBootServices is invoked. */
1517 for (i = 0; i < ARRAY_SIZE(efi_events); ++i) {
1518 if (efi_events[i].type != EVT_SIGNAL_EXIT_BOOT_SERVICES)
1520 efi_signal_event(&efi_events[i]);
1522 /* Make sure that notification functions are not called anymore */
1523 efi_tpl = TPL_HIGH_LEVEL;
1525 /* XXX Should persist EFI variables here */
1527 board_quiesce_devices();
1529 /* Fix up caches for EFI payloads if necessary */
1532 /* This stops all lingering devices */
1533 bootm_disable_interrupts();
1535 /* Give the payload some time to boot */
1536 efi_set_watchdog(0);
1539 return EFI_EXIT(EFI_SUCCESS);
1543 * Get next value of the counter.
1545 * This function implements the NextMonotonicCount service.
1546 * See the Unified Extensible Firmware Interface (UEFI) specification
1549 * @count returned value of the counter
1550 * @return status code
1552 static efi_status_t EFIAPI efi_get_next_monotonic_count(uint64_t *count)
1554 static uint64_t mono = 0;
1555 EFI_ENTRY("%p", count);
1557 return EFI_EXIT(EFI_SUCCESS);
1563 * This function implements the Stall sercive.
1564 * See the Unified Extensible Firmware Interface (UEFI) specification
1567 * @microseconds period to sleep in microseconds
1568 * @return status code
1570 static efi_status_t EFIAPI efi_stall(unsigned long microseconds)
1572 EFI_ENTRY("%ld", microseconds);
1573 udelay(microseconds);
1574 return EFI_EXIT(EFI_SUCCESS);
1578 * Reset the watchdog timer.
1580 * This function implements the SetWatchdogTimer service.
1581 * See the Unified Extensible Firmware Interface (UEFI) specification
1584 * @timeout seconds before reset by watchdog
1585 * @watchdog_code code to be logged when resetting
1586 * @data_size size of buffer in bytes
1587 * @watchdog_data buffer with data describing the reset reason
1588 * @return status code
1590 static efi_status_t EFIAPI efi_set_watchdog_timer(unsigned long timeout,
1591 uint64_t watchdog_code,
1592 unsigned long data_size,
1593 uint16_t *watchdog_data)
1595 EFI_ENTRY("%ld, 0x%"PRIx64", %ld, %p", timeout, watchdog_code,
1596 data_size, watchdog_data);
1597 return EFI_EXIT(efi_set_watchdog(timeout));
1601 * Connect a controller to a driver.
1603 * This function implements the ConnectController service.
1604 * See the Unified Extensible Firmware Interface (UEFI) specification
1607 * @controller_handle handle of the controller
1608 * @driver_image_handle handle of the driver
1609 * @remain_device_path device path of a child controller
1610 * @recursive true to connect all child controllers
1611 * @return status code
1613 static efi_status_t EFIAPI efi_connect_controller(
1614 efi_handle_t controller_handle,
1615 efi_handle_t *driver_image_handle,
1616 struct efi_device_path *remain_device_path,
1619 EFI_ENTRY("%p, %p, %p, %d", controller_handle, driver_image_handle,
1620 remain_device_path, recursive);
1621 return EFI_EXIT(EFI_NOT_FOUND);
1625 * Disconnect a controller from a driver.
1627 * This function implements the DisconnectController service.
1628 * See the Unified Extensible Firmware Interface (UEFI) specification
1631 * @controller_handle handle of the controller
1632 * @driver_image_handle handle of the driver
1633 * @child_handle handle of the child to destroy
1634 * @return status code
1636 static efi_status_t EFIAPI efi_disconnect_controller(void *controller_handle,
1637 void *driver_image_handle,
1640 EFI_ENTRY("%p, %p, %p", controller_handle, driver_image_handle,
1642 return EFI_EXIT(EFI_INVALID_PARAMETER);
1648 * This function implements the CloseProtocol service.
1649 * See the Unified Extensible Firmware Interface (UEFI) specification
1652 * @handle handle on which the protocol shall be closed
1653 * @protocol GUID of the protocol to close
1654 * @agent_handle handle of the driver
1655 * @controller_handle handle of the controller
1656 * @return status code
1658 static efi_status_t EFIAPI efi_close_protocol(void *handle,
1659 const efi_guid_t *protocol,
1661 void *controller_handle)
1663 EFI_ENTRY("%p, %pUl, %p, %p", handle, protocol, agent_handle,
1665 return EFI_EXIT(EFI_NOT_FOUND);
1669 * Provide information about then open status of a protocol on a handle
1671 * This function implements the OpenProtocolInformation service.
1672 * See the Unified Extensible Firmware Interface (UEFI) specification
1675 * @handle handle for which the information shall be retrieved
1676 * @protocol GUID of the protocol
1677 * @entry_buffer buffer to receive the open protocol information
1678 * @entry_count number of entries available in the buffer
1679 * @return status code
1681 static efi_status_t EFIAPI efi_open_protocol_information(efi_handle_t handle,
1682 const efi_guid_t *protocol,
1683 struct efi_open_protocol_info_entry **entry_buffer,
1684 efi_uintn_t *entry_count)
1686 EFI_ENTRY("%p, %pUl, %p, %p", handle, protocol, entry_buffer,
1688 return EFI_EXIT(EFI_NOT_FOUND);
1692 * Get protocols installed on a handle.
1694 * This function implements the ProtocolsPerHandleService.
1695 * See the Unified Extensible Firmware Interface (UEFI) specification
1698 * @handle handle for which the information is retrieved
1699 * @protocol_buffer buffer with protocol GUIDs
1700 * @protocol_buffer_count number of entries in the buffer
1701 * @return status code
1703 static efi_status_t EFIAPI efi_protocols_per_handle(void *handle,
1704 efi_guid_t ***protocol_buffer,
1705 efi_uintn_t *protocol_buffer_count)
1707 unsigned long buffer_size;
1708 struct efi_object *efiobj;
1709 struct list_head *protocol_handle;
1712 EFI_ENTRY("%p, %p, %p", handle, protocol_buffer,
1713 protocol_buffer_count);
1715 if (!handle || !protocol_buffer || !protocol_buffer_count)
1716 return EFI_EXIT(EFI_INVALID_PARAMETER);
1718 *protocol_buffer = NULL;
1719 *protocol_buffer_count = 0;
1721 efiobj = efi_search_obj(handle);
1723 return EFI_EXIT(EFI_INVALID_PARAMETER);
1725 /* Count protocols */
1726 list_for_each(protocol_handle, &efiobj->protocols) {
1727 ++*protocol_buffer_count;
1731 if (*protocol_buffer_count) {
1734 buffer_size = sizeof(efi_guid_t *) * *protocol_buffer_count;
1735 r = efi_allocate_pool(EFI_ALLOCATE_ANY_PAGES, buffer_size,
1736 (void **)protocol_buffer);
1737 if (r != EFI_SUCCESS)
1739 list_for_each(protocol_handle, &efiobj->protocols) {
1740 struct efi_handler *protocol;
1742 protocol = list_entry(protocol_handle,
1743 struct efi_handler, link);
1744 (*protocol_buffer)[j] = (void *)protocol->guid;
1749 return EFI_EXIT(EFI_SUCCESS);
1753 * Locate handles implementing a protocol.
1755 * This function implements the LocateHandleBuffer service.
1756 * See the Unified Extensible Firmware Interface (UEFI) specification
1759 * @search_type selection criterion
1760 * @protocol GUID of the protocol
1761 * @search_key registration key
1762 * @no_handles number of returned handles
1763 * @buffer buffer with the returned handles
1764 * @return status code
1766 static efi_status_t EFIAPI efi_locate_handle_buffer(
1767 enum efi_locate_search_type search_type,
1768 const efi_guid_t *protocol, void *search_key,
1769 efi_uintn_t *no_handles, efi_handle_t **buffer)
1772 efi_uintn_t buffer_size = 0;
1774 EFI_ENTRY("%d, %pUl, %p, %p, %p", search_type, protocol, search_key,
1775 no_handles, buffer);
1777 if (!no_handles || !buffer) {
1778 r = EFI_INVALID_PARAMETER;
1783 r = efi_locate_handle(search_type, protocol, search_key, &buffer_size,
1785 if (r != EFI_BUFFER_TOO_SMALL)
1787 r = efi_allocate_pool(EFI_ALLOCATE_ANY_PAGES, buffer_size,
1789 if (r != EFI_SUCCESS)
1791 r = efi_locate_handle(search_type, protocol, search_key, &buffer_size,
1793 if (r == EFI_SUCCESS)
1794 *no_handles = buffer_size / sizeof(void *);
1800 * Find an interface implementing a protocol.
1802 * This function implements the LocateProtocol service.
1803 * See the Unified Extensible Firmware Interface (UEFI) specification
1806 * @protocol GUID of the protocol
1807 * @registration registration key passed to the notification function
1808 * @protocol_interface interface implementing the protocol
1809 * @return status code
1811 static efi_status_t EFIAPI efi_locate_protocol(const efi_guid_t *protocol,
1813 void **protocol_interface)
1815 struct list_head *lhandle;
1818 EFI_ENTRY("%pUl, %p, %p", protocol, registration, protocol_interface);
1820 if (!protocol || !protocol_interface)
1821 return EFI_EXIT(EFI_INVALID_PARAMETER);
1823 list_for_each(lhandle, &efi_obj_list) {
1824 struct efi_object *efiobj;
1825 struct efi_handler *handler;
1827 efiobj = list_entry(lhandle, struct efi_object, link);
1829 ret = efi_search_protocol(efiobj->handle, protocol, &handler);
1830 if (ret == EFI_SUCCESS) {
1831 *protocol_interface = handler->protocol_interface;
1832 return EFI_EXIT(EFI_SUCCESS);
1835 *protocol_interface = NULL;
1837 return EFI_EXIT(EFI_NOT_FOUND);
1841 * Get the device path and handle of an device implementing a protocol.
1843 * This function implements the LocateDevicePath service.
1844 * See the Unified Extensible Firmware Interface (UEFI) specification
1847 * @protocol GUID of the protocol
1848 * @device_path device path
1849 * @device handle of the device
1850 * @return status code
1852 static efi_status_t EFIAPI efi_locate_device_path(
1853 const efi_guid_t *protocol,
1854 struct efi_device_path **device_path,
1855 efi_handle_t *device)
1857 struct efi_device_path *dp;
1859 struct efi_handler *handler;
1860 efi_handle_t *handles;
1862 size_t len_best = 0;
1863 efi_uintn_t no_handles;
1867 EFI_ENTRY("%pUl, %p, %p", protocol, device_path, device);
1869 if (!protocol || !device_path || !*device_path || !device) {
1870 ret = EFI_INVALID_PARAMETER;
1874 /* Find end of device path */
1875 len = efi_dp_size(*device_path);
1877 /* Get all handles implementing the protocol */
1878 ret = EFI_CALL(efi_locate_handle_buffer(BY_PROTOCOL, protocol, NULL,
1879 &no_handles, &handles));
1880 if (ret != EFI_SUCCESS)
1883 for (i = 0; i < no_handles; ++i) {
1884 /* Find the device path protocol */
1885 ret = efi_search_protocol(handles[i], &efi_guid_device_path,
1887 if (ret != EFI_SUCCESS)
1889 dp = (struct efi_device_path *)handler->protocol_interface;
1890 len_dp = efi_dp_size(dp);
1892 * This handle can only be a better fit
1893 * if its device path length is longer than the best fit and
1894 * if its device path length is shorter of equal the searched
1897 if (len_dp <= len_best || len_dp > len)
1899 /* Check if dp is a subpath of device_path */
1900 if (memcmp(*device_path, dp, len_dp))
1902 *device = handles[i];
1906 remainder = (u8 *)*device_path + len_best;
1907 *device_path = (struct efi_device_path *)remainder;
1910 ret = EFI_NOT_FOUND;
1913 return EFI_EXIT(ret);
1917 * Install multiple protocol interfaces.
1919 * This function implements the MultipleProtocolInterfaces service.
1920 * See the Unified Extensible Firmware Interface (UEFI) specification
1923 * @handle handle on which the protocol interfaces shall be installed
1924 * @... NULL terminated argument list with pairs of protocol GUIDS and
1926 * @return status code
1928 static efi_status_t EFIAPI efi_install_multiple_protocol_interfaces(
1931 EFI_ENTRY("%p", handle);
1934 const efi_guid_t *protocol;
1935 void *protocol_interface;
1936 efi_status_t r = EFI_SUCCESS;
1940 return EFI_EXIT(EFI_INVALID_PARAMETER);
1942 va_start(argptr, handle);
1944 protocol = va_arg(argptr, efi_guid_t*);
1947 protocol_interface = va_arg(argptr, void*);
1948 r = EFI_CALL(efi_install_protocol_interface(
1950 EFI_NATIVE_INTERFACE,
1951 protocol_interface));
1952 if (r != EFI_SUCCESS)
1957 if (r == EFI_SUCCESS)
1960 /* If an error occurred undo all changes. */
1961 va_start(argptr, handle);
1963 protocol = va_arg(argptr, efi_guid_t*);
1964 protocol_interface = va_arg(argptr, void*);
1965 EFI_CALL(efi_uninstall_protocol_interface(handle, protocol,
1966 protocol_interface));
1974 * Uninstall multiple protocol interfaces.
1976 * This function implements the UninstallMultipleProtocolInterfaces service.
1977 * See the Unified Extensible Firmware Interface (UEFI) specification
1980 * @handle handle from which the protocol interfaces shall be removed
1981 * @... NULL terminated argument list with pairs of protocol GUIDS and
1983 * @return status code
1985 static efi_status_t EFIAPI efi_uninstall_multiple_protocol_interfaces(
1988 EFI_ENTRY("%p", handle);
1991 const efi_guid_t *protocol;
1992 void *protocol_interface;
1993 efi_status_t r = EFI_SUCCESS;
1997 return EFI_EXIT(EFI_INVALID_PARAMETER);
1999 va_start(argptr, handle);
2001 protocol = va_arg(argptr, efi_guid_t*);
2004 protocol_interface = va_arg(argptr, void*);
2005 r = EFI_CALL(efi_uninstall_protocol_interface(
2007 protocol_interface));
2008 if (r != EFI_SUCCESS)
2013 if (r == EFI_SUCCESS)
2016 /* If an error occurred undo all changes. */
2017 va_start(argptr, handle);
2019 protocol = va_arg(argptr, efi_guid_t*);
2020 protocol_interface = va_arg(argptr, void*);
2021 EFI_CALL(efi_install_protocol_interface(&handle, protocol,
2022 EFI_NATIVE_INTERFACE,
2023 protocol_interface));
2031 * Calculate cyclic redundancy code.
2033 * This function implements the CalculateCrc32 service.
2034 * See the Unified Extensible Firmware Interface (UEFI) specification
2037 * @data buffer with data
2038 * @data_size size of buffer in bytes
2039 * @crc32_p cyclic redundancy code
2040 * @return status code
2042 static efi_status_t EFIAPI efi_calculate_crc32(void *data,
2043 unsigned long data_size,
2046 EFI_ENTRY("%p, %ld", data, data_size);
2047 *crc32_p = crc32(0, data, data_size);
2048 return EFI_EXIT(EFI_SUCCESS);
2054 * This function implements the CopyMem service.
2055 * See the Unified Extensible Firmware Interface (UEFI) specification
2058 * @destination destination of the copy operation
2059 * @source source of the copy operation
2060 * @length number of bytes to copy
2062 static void EFIAPI efi_copy_mem(void *destination, const void *source,
2065 EFI_ENTRY("%p, %p, %ld", destination, source, (unsigned long)length);
2066 memcpy(destination, source, length);
2067 EFI_EXIT(EFI_SUCCESS);
2071 * Fill memory with a byte value.
2073 * This function implements the SetMem service.
2074 * See the Unified Extensible Firmware Interface (UEFI) specification
2077 * @buffer buffer to fill
2078 * @size size of buffer in bytes
2079 * @value byte to copy to the buffer
2081 static void EFIAPI efi_set_mem(void *buffer, size_t size, uint8_t value)
2083 EFI_ENTRY("%p, %ld, 0x%x", buffer, (unsigned long)size, value);
2084 memset(buffer, value, size);
2085 EFI_EXIT(EFI_SUCCESS);
2089 * Open protocol interface on a handle.
2091 * This function implements the OpenProtocol interface.
2092 * See the Unified Extensible Firmware Interface (UEFI) specification
2095 * @handle handle on which the protocol shall be opened
2096 * @protocol GUID of the protocol
2097 * @protocol_interface interface implementing the protocol
2098 * @agent_handle handle of the driver
2099 * @controller_handle handle of the controller
2100 * @attributes attributes indicating how to open the protocol
2101 * @return status code
2103 static efi_status_t EFIAPI efi_open_protocol(
2104 void *handle, const efi_guid_t *protocol,
2105 void **protocol_interface, void *agent_handle,
2106 void *controller_handle, uint32_t attributes)
2108 struct efi_handler *handler;
2109 efi_status_t r = EFI_INVALID_PARAMETER;
2111 EFI_ENTRY("%p, %pUl, %p, %p, %p, 0x%x", handle, protocol,
2112 protocol_interface, agent_handle, controller_handle,
2115 if (!handle || !protocol ||
2116 (!protocol_interface && attributes !=
2117 EFI_OPEN_PROTOCOL_TEST_PROTOCOL)) {
2121 switch (attributes) {
2122 case EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL:
2123 case EFI_OPEN_PROTOCOL_GET_PROTOCOL:
2124 case EFI_OPEN_PROTOCOL_TEST_PROTOCOL:
2126 case EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER:
2127 if (controller_handle == handle)
2129 case EFI_OPEN_PROTOCOL_BY_DRIVER:
2130 case EFI_OPEN_PROTOCOL_BY_DRIVER | EFI_OPEN_PROTOCOL_EXCLUSIVE:
2131 if (controller_handle == NULL)
2133 case EFI_OPEN_PROTOCOL_EXCLUSIVE:
2134 if (agent_handle == NULL)
2141 r = efi_search_protocol(handle, protocol, &handler);
2142 if (r != EFI_SUCCESS)
2145 if (attributes != EFI_OPEN_PROTOCOL_TEST_PROTOCOL)
2146 *protocol_interface = handler->protocol_interface;
2152 * Get interface of a protocol on a handle.
2154 * This function implements the HandleProtocol service.
2155 * See the Unified Extensible Firmware Interface (UEFI) specification
2158 * @handle handle on which the protocol shall be opened
2159 * @protocol GUID of the protocol
2160 * @protocol_interface interface implementing the protocol
2161 * @return status code
2163 static efi_status_t EFIAPI efi_handle_protocol(void *handle,
2164 const efi_guid_t *protocol,
2165 void **protocol_interface)
2167 return efi_open_protocol(handle, protocol, protocol_interface, NULL,
2168 NULL, EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL);
2171 static const struct efi_boot_services efi_boot_services = {
2173 .headersize = sizeof(struct efi_table_hdr),
2175 .raise_tpl = efi_raise_tpl,
2176 .restore_tpl = efi_restore_tpl,
2177 .allocate_pages = efi_allocate_pages_ext,
2178 .free_pages = efi_free_pages_ext,
2179 .get_memory_map = efi_get_memory_map_ext,
2180 .allocate_pool = efi_allocate_pool_ext,
2181 .free_pool = efi_free_pool_ext,
2182 .create_event = efi_create_event_ext,
2183 .set_timer = efi_set_timer_ext,
2184 .wait_for_event = efi_wait_for_event,
2185 .signal_event = efi_signal_event_ext,
2186 .close_event = efi_close_event,
2187 .check_event = efi_check_event,
2188 .install_protocol_interface = efi_install_protocol_interface,
2189 .reinstall_protocol_interface = efi_reinstall_protocol_interface,
2190 .uninstall_protocol_interface = efi_uninstall_protocol_interface,
2191 .handle_protocol = efi_handle_protocol,
2193 .register_protocol_notify = efi_register_protocol_notify,
2194 .locate_handle = efi_locate_handle_ext,
2195 .locate_device_path = efi_locate_device_path,
2196 .install_configuration_table = efi_install_configuration_table_ext,
2197 .load_image = efi_load_image,
2198 .start_image = efi_start_image,
2200 .unload_image = efi_unload_image,
2201 .exit_boot_services = efi_exit_boot_services,
2202 .get_next_monotonic_count = efi_get_next_monotonic_count,
2204 .set_watchdog_timer = efi_set_watchdog_timer,
2205 .connect_controller = efi_connect_controller,
2206 .disconnect_controller = efi_disconnect_controller,
2207 .open_protocol = efi_open_protocol,
2208 .close_protocol = efi_close_protocol,
2209 .open_protocol_information = efi_open_protocol_information,
2210 .protocols_per_handle = efi_protocols_per_handle,
2211 .locate_handle_buffer = efi_locate_handle_buffer,
2212 .locate_protocol = efi_locate_protocol,
2213 .install_multiple_protocol_interfaces = efi_install_multiple_protocol_interfaces,
2214 .uninstall_multiple_protocol_interfaces = efi_uninstall_multiple_protocol_interfaces,
2215 .calculate_crc32 = efi_calculate_crc32,
2216 .copy_mem = efi_copy_mem,
2217 .set_mem = efi_set_mem,
2221 static uint16_t __efi_runtime_data firmware_vendor[] = L"Das U-Boot";
2223 struct efi_system_table __efi_runtime_data systab = {
2225 .signature = EFI_SYSTEM_TABLE_SIGNATURE,
2226 .revision = 0x20005, /* 2.5 */
2227 .headersize = sizeof(struct efi_table_hdr),
2229 .fw_vendor = (long)firmware_vendor,
2230 .con_in = (void*)&efi_con_in,
2231 .con_out = (void*)&efi_con_out,
2232 .std_err = (void*)&efi_con_out,
2233 .runtime = (void*)&efi_runtime_services,
2234 .boottime = (void*)&efi_boot_services,
2236 .tables = (void*)efi_conf_table,