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);
324 static efi_status_t efi_create_handle(void **handle)
326 struct efi_object *obj;
329 r = efi_allocate_pool(EFI_ALLOCATE_ANY_PAGES,
330 sizeof(struct efi_object),
332 if (r != EFI_SUCCESS)
334 memset(obj, 0, sizeof(struct efi_object));
336 list_add_tail(&obj->link, &efi_obj_list);
342 * Our event capabilities are very limited. Only a small limited
343 * number of events is allowed to coexist.
345 static struct efi_event efi_events[16];
350 * This function is used inside U-Boot code to create an event.
352 * For the API function implementing the CreateEvent service see
353 * efi_create_event_ext.
355 * @type type of the event to create
356 * @notify_tpl task priority level of the event
357 * @notify_function notification function of the event
358 * @notify_context pointer passed to the notification function
359 * @event created event
360 * @return status code
362 efi_status_t efi_create_event(uint32_t type, efi_uintn_t notify_tpl,
363 void (EFIAPI *notify_function) (
364 struct efi_event *event,
366 void *notify_context, struct efi_event **event)
371 return EFI_INVALID_PARAMETER;
373 if ((type & EVT_NOTIFY_SIGNAL) && (type & EVT_NOTIFY_WAIT))
374 return EFI_INVALID_PARAMETER;
376 if ((type & (EVT_NOTIFY_SIGNAL|EVT_NOTIFY_WAIT)) &&
377 notify_function == NULL)
378 return EFI_INVALID_PARAMETER;
380 for (i = 0; i < ARRAY_SIZE(efi_events); ++i) {
381 if (efi_events[i].type)
383 efi_events[i].type = type;
384 efi_events[i].notify_tpl = notify_tpl;
385 efi_events[i].notify_function = notify_function;
386 efi_events[i].notify_context = notify_context;
387 /* Disable timers on bootup */
388 efi_events[i].trigger_next = -1ULL;
389 efi_events[i].is_queued = false;
390 efi_events[i].is_signaled = false;
391 *event = &efi_events[i];
394 return EFI_OUT_OF_RESOURCES;
400 * This function implements the CreateEvent service.
401 * See the Unified Extensible Firmware Interface (UEFI) specification
404 * @type type of the event to create
405 * @notify_tpl task priority level of the event
406 * @notify_function notification function of the event
407 * @notify_context pointer passed to the notification function
408 * @event created event
409 * @return status code
411 static efi_status_t EFIAPI efi_create_event_ext(
412 uint32_t type, efi_uintn_t notify_tpl,
413 void (EFIAPI *notify_function) (
414 struct efi_event *event,
416 void *notify_context, struct efi_event **event)
418 EFI_ENTRY("%d, 0x%zx, %p, %p", type, notify_tpl, notify_function,
420 return EFI_EXIT(efi_create_event(type, notify_tpl, notify_function,
421 notify_context, event));
426 * Check if a timer event has occurred or a queued notification function should
429 * Our timers have to work without interrupts, so we check whenever keyboard
430 * input or disk accesses happen if enough time elapsed for them to fire.
432 void efi_timer_check(void)
435 u64 now = timer_get_us();
437 for (i = 0; i < ARRAY_SIZE(efi_events); ++i) {
438 if (!efi_events[i].type)
440 if (efi_events[i].is_queued)
441 efi_signal_event(&efi_events[i]);
442 if (!(efi_events[i].type & EVT_TIMER) ||
443 now < efi_events[i].trigger_next)
445 switch (efi_events[i].trigger_type) {
446 case EFI_TIMER_RELATIVE:
447 efi_events[i].trigger_type = EFI_TIMER_STOP;
449 case EFI_TIMER_PERIODIC:
450 efi_events[i].trigger_next +=
451 efi_events[i].trigger_time;
456 efi_events[i].is_signaled = true;
457 efi_signal_event(&efi_events[i]);
463 * Set the trigger time for a timer event or stop the event.
465 * This is the function for internal usage in U-Boot. For the API function
466 * implementing the SetTimer service see efi_set_timer_ext.
468 * @event event for which the timer is set
469 * @type type of the timer
470 * @trigger_time trigger period in multiples of 100ns
471 * @return status code
473 efi_status_t efi_set_timer(struct efi_event *event, enum efi_timer_delay type,
474 uint64_t trigger_time)
479 * The parameter defines a multiple of 100ns.
480 * We use multiples of 1000ns. So divide by 10.
482 do_div(trigger_time, 10);
484 for (i = 0; i < ARRAY_SIZE(efi_events); ++i) {
485 if (event != &efi_events[i])
488 if (!(event->type & EVT_TIMER))
492 event->trigger_next = -1ULL;
494 case EFI_TIMER_PERIODIC:
495 case EFI_TIMER_RELATIVE:
496 event->trigger_next =
497 timer_get_us() + trigger_time;
500 return EFI_INVALID_PARAMETER;
502 event->trigger_type = type;
503 event->trigger_time = trigger_time;
504 event->is_signaled = false;
507 return EFI_INVALID_PARAMETER;
511 * Set the trigger time for a timer event or stop the event.
513 * This function implements the SetTimer service.
514 * See the Unified Extensible Firmware Interface (UEFI) specification
517 * @event event for which the timer is set
518 * @type type of the timer
519 * @trigger_time trigger period in multiples of 100ns
520 * @return status code
522 static efi_status_t EFIAPI efi_set_timer_ext(struct efi_event *event,
523 enum efi_timer_delay type,
524 uint64_t trigger_time)
526 EFI_ENTRY("%p, %d, %"PRIx64, event, type, trigger_time);
527 return EFI_EXIT(efi_set_timer(event, type, trigger_time));
531 * Wait for events to be signaled.
533 * This function implements the WaitForEvent service.
534 * See the Unified Extensible Firmware Interface (UEFI) specification
537 * @num_events number of events to be waited for
538 * @events events to be waited for
539 * @index index of the event that was signaled
540 * @return status code
542 static efi_status_t EFIAPI efi_wait_for_event(efi_uintn_t num_events,
543 struct efi_event **event,
548 EFI_ENTRY("%zd, %p, %p", num_events, event, index);
550 /* Check parameters */
551 if (!num_events || !event)
552 return EFI_EXIT(EFI_INVALID_PARAMETER);
554 if (efi_tpl != TPL_APPLICATION)
555 return EFI_EXIT(EFI_UNSUPPORTED);
556 for (i = 0; i < num_events; ++i) {
557 for (j = 0; j < ARRAY_SIZE(efi_events); ++j) {
558 if (event[i] == &efi_events[j])
561 return EFI_EXIT(EFI_INVALID_PARAMETER);
563 if (!event[i]->type || event[i]->type & EVT_NOTIFY_SIGNAL)
564 return EFI_EXIT(EFI_INVALID_PARAMETER);
565 if (!event[i]->is_signaled)
566 efi_signal_event(event[i]);
569 /* Wait for signal */
571 for (i = 0; i < num_events; ++i) {
572 if (event[i]->is_signaled)
575 /* Allow events to occur. */
581 * Reset the signal which is passed to the caller to allow periodic
584 event[i]->is_signaled = false;
588 return EFI_EXIT(EFI_SUCCESS);
592 * Signal an EFI event.
594 * This function implements the SignalEvent service.
595 * See the Unified Extensible Firmware Interface (UEFI) specification
598 * This functions sets the signaled state of the event and queues the
599 * notification function for execution.
601 * @event event to signal
602 * @return status code
604 static efi_status_t EFIAPI efi_signal_event_ext(struct efi_event *event)
608 EFI_ENTRY("%p", event);
609 for (i = 0; i < ARRAY_SIZE(efi_events); ++i) {
610 if (event != &efi_events[i])
612 if (event->is_signaled)
614 event->is_signaled = true;
615 if (event->type & EVT_NOTIFY_SIGNAL)
616 efi_signal_event(event);
619 return EFI_EXIT(EFI_SUCCESS);
623 * Close an EFI event.
625 * This function implements the CloseEvent service.
626 * See the Unified Extensible Firmware Interface (UEFI) specification
629 * @event event to close
630 * @return status code
632 static efi_status_t EFIAPI efi_close_event(struct efi_event *event)
636 EFI_ENTRY("%p", event);
637 for (i = 0; i < ARRAY_SIZE(efi_events); ++i) {
638 if (event == &efi_events[i]) {
640 event->trigger_next = -1ULL;
641 event->is_queued = false;
642 event->is_signaled = false;
643 return EFI_EXIT(EFI_SUCCESS);
646 return EFI_EXIT(EFI_INVALID_PARAMETER);
650 * Check if an event is signaled.
652 * This function implements the CheckEvent service.
653 * See the Unified Extensible Firmware Interface (UEFI) specification
656 * If an event is not signaled yet the notification function is queued.
658 * @event event to check
659 * @return status code
661 static efi_status_t EFIAPI efi_check_event(struct efi_event *event)
665 EFI_ENTRY("%p", event);
667 for (i = 0; i < ARRAY_SIZE(efi_events); ++i) {
668 if (event != &efi_events[i])
670 if (!event->type || event->type & EVT_NOTIFY_SIGNAL)
672 if (!event->is_signaled)
673 efi_signal_event(event);
674 if (event->is_signaled)
675 return EFI_EXIT(EFI_SUCCESS);
676 return EFI_EXIT(EFI_NOT_READY);
678 return EFI_EXIT(EFI_INVALID_PARAMETER);
682 * Find the internal EFI object for a handle.
684 * @handle handle to find
687 struct efi_object *efi_search_obj(void *handle)
689 struct efi_object *efiobj;
691 list_for_each_entry(efiobj, &efi_obj_list, link) {
692 if (efiobj->handle == handle)
700 * Install protocol interface.
702 * This function implements the InstallProtocolInterface service.
703 * See the Unified Extensible Firmware Interface (UEFI) specification
706 * @handle handle on which the protocol shall be installed
707 * @protocol GUID of the protocol to be installed
708 * @protocol_interface_type type of the interface to be installed,
709 * always EFI_NATIVE_INTERFACE
710 * @protocol_interface interface of the protocol implementation
711 * @return status code
713 static efi_status_t EFIAPI efi_install_protocol_interface(
714 void **handle, const efi_guid_t *protocol,
715 int protocol_interface_type, void *protocol_interface)
717 struct list_head *lhandle;
721 EFI_ENTRY("%p, %pUl, %d, %p", handle, protocol, protocol_interface_type,
724 if (!handle || !protocol ||
725 protocol_interface_type != EFI_NATIVE_INTERFACE) {
726 r = EFI_INVALID_PARAMETER;
730 /* Create new handle if requested. */
732 r = efi_create_handle(handle);
733 if (r != EFI_SUCCESS)
737 list_for_each(lhandle, &efi_obj_list) {
738 struct efi_object *efiobj;
739 efiobj = list_entry(lhandle, struct efi_object, link);
741 if (efiobj->handle != *handle)
743 /* Check if protocol is already installed on the handle. */
744 for (i = 0; i < ARRAY_SIZE(efiobj->protocols); i++) {
745 struct efi_handler *handler = &efiobj->protocols[i];
749 if (!guidcmp(handler->guid, protocol)) {
750 r = EFI_INVALID_PARAMETER;
754 /* Install protocol in first empty slot. */
755 for (i = 0; i < ARRAY_SIZE(efiobj->protocols); i++) {
756 struct efi_handler *handler = &efiobj->protocols[i];
761 handler->guid = protocol;
762 handler->protocol_interface = protocol_interface;
766 r = EFI_OUT_OF_RESOURCES;
769 r = EFI_INVALID_PARAMETER;
775 * Reinstall protocol interface.
777 * This function implements the ReinstallProtocolInterface service.
778 * See the Unified Extensible Firmware Interface (UEFI) specification
781 * @handle handle on which the protocol shall be
783 * @protocol GUID of the protocol to be installed
784 * @old_interface interface to be removed
785 * @new_interface interface to be installed
786 * @return status code
788 static efi_status_t EFIAPI efi_reinstall_protocol_interface(void *handle,
789 const efi_guid_t *protocol, void *old_interface,
792 EFI_ENTRY("%p, %pUl, %p, %p", handle, protocol, old_interface,
794 return EFI_EXIT(EFI_ACCESS_DENIED);
798 * Uninstall protocol interface.
800 * This function implements the UninstallProtocolInterface service.
801 * See the Unified Extensible Firmware Interface (UEFI) specification
804 * @handle handle from which the protocol shall be removed
805 * @protocol GUID of the protocol to be removed
806 * @protocol_interface interface to be removed
807 * @return status code
809 static efi_status_t EFIAPI efi_uninstall_protocol_interface(
810 void *handle, const efi_guid_t *protocol,
811 void *protocol_interface)
813 struct list_head *lhandle;
815 efi_status_t r = EFI_NOT_FOUND;
817 EFI_ENTRY("%p, %pUl, %p", handle, protocol, protocol_interface);
819 if (!handle || !protocol) {
820 r = EFI_INVALID_PARAMETER;
824 list_for_each(lhandle, &efi_obj_list) {
825 struct efi_object *efiobj;
826 efiobj = list_entry(lhandle, struct efi_object, link);
828 if (efiobj->handle != handle)
831 for (i = 0; i < ARRAY_SIZE(efiobj->protocols); i++) {
832 struct efi_handler *handler = &efiobj->protocols[i];
833 const efi_guid_t *hprotocol = handler->guid;
837 if (!guidcmp(hprotocol, protocol)) {
838 if (handler->protocol_interface) {
839 r = EFI_ACCESS_DENIED;
854 * Register an event for notification when a protocol is installed.
856 * This function implements the RegisterProtocolNotify service.
857 * See the Unified Extensible Firmware Interface (UEFI) specification
860 * @protocol GUID of the protocol whose installation shall be
862 * @event event to be signaled upon installation of the protocol
863 * @registration key for retrieving the registration information
864 * @return status code
866 static efi_status_t EFIAPI efi_register_protocol_notify(
867 const efi_guid_t *protocol,
868 struct efi_event *event,
871 EFI_ENTRY("%pUl, %p, %p", protocol, event, registration);
872 return EFI_EXIT(EFI_OUT_OF_RESOURCES);
876 * Determine if an EFI handle implements a protocol.
878 * See the documentation of the LocateHandle service in the UEFI specification.
880 * @search_type selection criterion
881 * @protocol GUID of the protocol
882 * @search_key registration key
884 * @return 0 if the handle implements the protocol
886 static int efi_search(enum efi_locate_search_type search_type,
887 const efi_guid_t *protocol, void *search_key,
888 struct efi_object *efiobj)
892 switch (search_type) {
895 case BY_REGISTER_NOTIFY:
896 /* RegisterProtocolNotify is not implemented yet */
899 for (i = 0; i < ARRAY_SIZE(efiobj->protocols); i++) {
900 const efi_guid_t *guid = efiobj->protocols[i].guid;
901 if (guid && !guidcmp(guid, protocol))
911 * Locate handles implementing a protocol.
913 * This function is meant for U-Boot internal calls. For the API implementation
914 * of the LocateHandle service see efi_locate_handle_ext.
916 * @search_type selection criterion
917 * @protocol GUID of the protocol
918 * @search_key registration key
919 * @buffer_size size of the buffer to receive the handles in bytes
920 * @buffer buffer to receive the relevant handles
921 * @return status code
923 static efi_status_t efi_locate_handle(
924 enum efi_locate_search_type search_type,
925 const efi_guid_t *protocol, void *search_key,
926 efi_uintn_t *buffer_size, efi_handle_t *buffer)
928 struct efi_object *efiobj;
929 efi_uintn_t size = 0;
931 /* Check parameters */
932 switch (search_type) {
935 case BY_REGISTER_NOTIFY:
937 return EFI_INVALID_PARAMETER;
938 /* RegisterProtocolNotify is not implemented yet */
939 return EFI_UNSUPPORTED;
942 return EFI_INVALID_PARAMETER;
945 return EFI_INVALID_PARAMETER;
949 * efi_locate_handle_buffer uses this function for
950 * the calculation of the necessary buffer size.
951 * So do not require a buffer for buffersize == 0.
953 if (!buffer_size || (*buffer_size && !buffer))
954 return EFI_INVALID_PARAMETER;
956 /* Count how much space we need */
957 list_for_each_entry(efiobj, &efi_obj_list, link) {
958 if (!efi_search(search_type, protocol, search_key, efiobj))
959 size += sizeof(void*);
962 if (*buffer_size < size) {
964 return EFI_BUFFER_TOO_SMALL;
969 return EFI_NOT_FOUND;
971 /* Then fill the array */
972 list_for_each_entry(efiobj, &efi_obj_list, link) {
973 if (!efi_search(search_type, protocol, search_key, efiobj))
974 *buffer++ = efiobj->handle;
981 * Locate handles implementing a protocol.
983 * This function implements the LocateHandle service.
984 * See the Unified Extensible Firmware Interface (UEFI) specification
987 * @search_type selection criterion
988 * @protocol GUID of the protocol
989 * @search_key registration key
990 * @buffer_size size of the buffer to receive the handles in bytes
991 * @buffer buffer to receive the relevant handles
992 * @return 0 if the handle implements the protocol
994 static efi_status_t EFIAPI efi_locate_handle_ext(
995 enum efi_locate_search_type search_type,
996 const efi_guid_t *protocol, void *search_key,
997 efi_uintn_t *buffer_size, efi_handle_t *buffer)
999 EFI_ENTRY("%d, %pUl, %p, %p, %p", search_type, protocol, search_key,
1000 buffer_size, buffer);
1002 return EFI_EXIT(efi_locate_handle(search_type, protocol, search_key,
1003 buffer_size, buffer));
1007 * Get the device path and handle of an device implementing a protocol.
1009 * This function implements the LocateDevicePath service.
1010 * See the Unified Extensible Firmware Interface (UEFI) specification
1013 * @protocol GUID of the protocol
1014 * @device_path device path
1015 * @device handle of the device
1016 * @return status code
1018 static efi_status_t EFIAPI efi_locate_device_path(
1019 const efi_guid_t *protocol,
1020 struct efi_device_path **device_path,
1021 efi_handle_t *device)
1023 struct efi_object *efiobj;
1025 EFI_ENTRY("%pUl, %p, %p", protocol, device_path, device);
1027 efiobj = efi_dp_find_obj(*device_path, device_path);
1029 return EFI_EXIT(EFI_NOT_FOUND);
1031 *device = efiobj->handle;
1033 return EFI_EXIT(EFI_SUCCESS);
1036 /* Collapses configuration table entries, removing index i */
1037 static void efi_remove_configuration_table(int i)
1039 struct efi_configuration_table *this = &efi_conf_table[i];
1040 struct efi_configuration_table *next = &efi_conf_table[i+1];
1041 struct efi_configuration_table *end = &efi_conf_table[systab.nr_tables];
1043 memmove(this, next, (ulong)end - (ulong)next);
1048 * Adds, updates, or removes a configuration table.
1050 * This function is used for internal calls. For the API implementation of the
1051 * InstallConfigurationTable service see efi_install_configuration_table_ext.
1053 * @guid GUID of the installed table
1054 * @table table to be installed
1055 * @return status code
1057 efi_status_t efi_install_configuration_table(const efi_guid_t *guid, void *table)
1061 /* Check for guid override */
1062 for (i = 0; i < systab.nr_tables; i++) {
1063 if (!guidcmp(guid, &efi_conf_table[i].guid)) {
1065 efi_conf_table[i].table = table;
1067 efi_remove_configuration_table(i);
1073 return EFI_NOT_FOUND;
1075 /* No override, check for overflow */
1076 if (i >= ARRAY_SIZE(efi_conf_table))
1077 return EFI_OUT_OF_RESOURCES;
1079 /* Add a new entry */
1080 memcpy(&efi_conf_table[i].guid, guid, sizeof(*guid));
1081 efi_conf_table[i].table = table;
1082 systab.nr_tables = i + 1;
1088 * Adds, updates, or removes a configuration table.
1090 * This function implements the InstallConfigurationTable service.
1091 * See the Unified Extensible Firmware Interface (UEFI) specification
1094 * @guid GUID of the installed table
1095 * @table table to be installed
1096 * @return status code
1098 static efi_status_t EFIAPI efi_install_configuration_table_ext(efi_guid_t *guid,
1101 EFI_ENTRY("%pUl, %p", guid, table);
1102 return EFI_EXIT(efi_install_configuration_table(guid, table));
1106 * Initialize a loaded_image_info + loaded_image_info object with correct
1107 * protocols, boot-device, etc.
1109 * @info loaded image info to be passed to the entry point of the
1111 * @obj internal object associated with the loaded image
1112 * @device_path device path of the loaded image
1113 * @file_path file path of the loaded image
1115 void efi_setup_loaded_image(struct efi_loaded_image *info, struct efi_object *obj,
1116 struct efi_device_path *device_path,
1117 struct efi_device_path *file_path)
1122 * When asking for the device path interface, return
1123 * bootefi_device_path
1125 obj->protocols[0].guid = &efi_guid_device_path;
1126 obj->protocols[0].protocol_interface = device_path;
1129 * When asking for the loaded_image interface, just
1130 * return handle which points to loaded_image_info
1132 obj->protocols[1].guid = &efi_guid_loaded_image;
1133 obj->protocols[1].protocol_interface = info;
1135 obj->protocols[2].guid = &efi_guid_console_control;
1136 obj->protocols[2].protocol_interface = (void *)&efi_console_control;
1138 obj->protocols[3].guid = &efi_guid_device_path_to_text_protocol;
1139 obj->protocols[3].protocol_interface =
1140 (void *)&efi_device_path_to_text;
1142 info->file_path = file_path;
1144 info->device_handle = efi_dp_find_obj(device_path, NULL);
1146 list_add_tail(&obj->link, &efi_obj_list);
1150 * Load an image using a file path.
1152 * @file_path the path of the image to load
1153 * @buffer buffer containing the loaded image
1154 * @return status code
1156 efi_status_t efi_load_image_from_path(struct efi_device_path *file_path,
1159 struct efi_file_info *info = NULL;
1160 struct efi_file_handle *f;
1161 static efi_status_t ret;
1164 f = efi_file_from_path(file_path);
1166 return EFI_DEVICE_ERROR;
1169 EFI_CALL(ret = f->getinfo(f, (efi_guid_t *)&efi_file_info_guid,
1171 if (ret == EFI_BUFFER_TOO_SMALL) {
1173 EFI_CALL(ret = f->getinfo(f, (efi_guid_t *)&efi_file_info_guid,
1176 if (ret != EFI_SUCCESS)
1179 ret = efi_allocate_pool(EFI_LOADER_DATA, info->file_size, buffer);
1183 EFI_CALL(ret = f->read(f, &info->file_size, *buffer));
1187 EFI_CALL(f->close(f));
1189 if (ret != EFI_SUCCESS) {
1190 efi_free_pool(*buffer);
1198 * Load an EFI image into memory.
1200 * This function implements the LoadImage service.
1201 * See the Unified Extensible Firmware Interface (UEFI) specification
1204 * @boot_policy true for request originating from the boot manager
1205 * @parent_image the calles's image handle
1206 * @file_path the path of the image to load
1207 * @source_buffer memory location from which the image is installed
1208 * @source_size size of the memory area from which the image is
1210 * @image_handle handle for the newly installed image
1211 * @return status code
1213 static efi_status_t EFIAPI efi_load_image(bool boot_policy,
1214 efi_handle_t parent_image,
1215 struct efi_device_path *file_path,
1216 void *source_buffer,
1217 unsigned long source_size,
1218 efi_handle_t *image_handle)
1220 struct efi_loaded_image *info;
1221 struct efi_object *obj;
1223 EFI_ENTRY("%d, %p, %p, %p, %ld, %p", boot_policy, parent_image,
1224 file_path, source_buffer, source_size, image_handle);
1226 info = calloc(1, sizeof(*info));
1227 obj = calloc(1, sizeof(*obj));
1229 if (!source_buffer) {
1230 struct efi_device_path *dp, *fp;
1233 ret = efi_load_image_from_path(file_path, &source_buffer);
1234 if (ret != EFI_SUCCESS) {
1237 return EFI_EXIT(ret);
1241 * split file_path which contains both the device and
1244 efi_dp_split_file_path(file_path, &dp, &fp);
1246 efi_setup_loaded_image(info, obj, dp, fp);
1248 /* In this case, file_path is the "device" path, ie.
1249 * something like a HARDWARE_DEVICE:MEMORY_MAPPED
1251 efi_setup_loaded_image(info, obj, file_path, NULL);
1254 info->reserved = efi_load_pe(source_buffer, info);
1255 if (!info->reserved) {
1258 return EFI_EXIT(EFI_UNSUPPORTED);
1261 info->system_table = &systab;
1262 info->parent_handle = parent_image;
1263 *image_handle = info;
1265 return EFI_EXIT(EFI_SUCCESS);
1269 * Call the entry point of an image.
1271 * This function implements the StartImage service.
1272 * See the Unified Extensible Firmware Interface (UEFI) specification
1275 * @image_handle handle of the image
1276 * @exit_data_size size of the buffer
1277 * @exit_data buffer to receive the exit data of the called image
1278 * @return status code
1280 static efi_status_t EFIAPI efi_start_image(efi_handle_t image_handle,
1281 unsigned long *exit_data_size,
1284 ulong (*entry)(void *image_handle, struct efi_system_table *st);
1285 struct efi_loaded_image *info = image_handle;
1287 EFI_ENTRY("%p, %p, %p", image_handle, exit_data_size, exit_data);
1288 entry = info->reserved;
1290 efi_is_direct_boot = false;
1292 /* call the image! */
1293 if (setjmp(&info->exit_jmp)) {
1294 /* We returned from the child image */
1295 return EFI_EXIT(info->exit_status);
1298 __efi_nesting_dec();
1300 entry(image_handle, &systab);
1301 __efi_entry_check();
1302 __efi_nesting_inc();
1304 /* Should usually never get here */
1305 return EFI_EXIT(EFI_SUCCESS);
1309 * Leave an EFI application or driver.
1311 * This function implements the Exit service.
1312 * See the Unified Extensible Firmware Interface (UEFI) specification
1315 * @image_handle handle of the application or driver that is exiting
1316 * @exit_status status code
1317 * @exit_data_size size of the buffer in bytes
1318 * @exit_data buffer with data describing an error
1319 * @return status code
1321 static efi_status_t EFIAPI efi_exit(efi_handle_t image_handle,
1322 efi_status_t exit_status, unsigned long exit_data_size,
1325 struct efi_loaded_image *loaded_image_info = (void*)image_handle;
1327 EFI_ENTRY("%p, %ld, %ld, %p", image_handle, exit_status,
1328 exit_data_size, exit_data);
1330 /* Make sure entry/exit counts for EFI world cross-overs match */
1334 * But longjmp out with the U-Boot gd, not the application's, as
1335 * the other end is a setjmp call inside EFI context.
1339 loaded_image_info->exit_status = exit_status;
1340 longjmp(&loaded_image_info->exit_jmp, 1);
1342 panic("EFI application exited");
1346 * Unload an EFI image.
1348 * This function implements the UnloadImage service.
1349 * See the Unified Extensible Firmware Interface (UEFI) specification
1352 * @image_handle handle of the image to be unloaded
1353 * @return status code
1355 static efi_status_t EFIAPI efi_unload_image(void *image_handle)
1357 struct efi_object *efiobj;
1359 EFI_ENTRY("%p", image_handle);
1360 efiobj = efi_search_obj(image_handle);
1362 list_del(&efiobj->link);
1364 return EFI_EXIT(EFI_SUCCESS);
1368 * Fix up caches for EFI payloads if necessary.
1370 static void efi_exit_caches(void)
1372 #if defined(CONFIG_ARM) && !defined(CONFIG_ARM64)
1374 * Grub on 32bit ARM needs to have caches disabled before jumping into
1375 * a zImage, but does not know of all cache layers. Give it a hand.
1377 if (efi_is_direct_boot)
1378 cleanup_before_linux();
1383 * Stop boot services.
1385 * This function implements the ExitBootServices service.
1386 * See the Unified Extensible Firmware Interface (UEFI) specification
1389 * @image_handle handle of the loaded image
1390 * @map_key key of the memory map
1391 * @return status code
1393 static efi_status_t EFIAPI efi_exit_boot_services(void *image_handle,
1394 unsigned long map_key)
1398 EFI_ENTRY("%p, %ld", image_handle, map_key);
1400 /* Notify that ExitBootServices is invoked. */
1401 for (i = 0; i < ARRAY_SIZE(efi_events); ++i) {
1402 if (efi_events[i].type != EVT_SIGNAL_EXIT_BOOT_SERVICES)
1404 efi_signal_event(&efi_events[i]);
1406 /* Make sure that notification functions are not called anymore */
1407 efi_tpl = TPL_HIGH_LEVEL;
1409 /* XXX Should persist EFI variables here */
1411 board_quiesce_devices();
1413 /* Fix up caches for EFI payloads if necessary */
1416 /* This stops all lingering devices */
1417 bootm_disable_interrupts();
1419 /* Give the payload some time to boot */
1420 efi_set_watchdog(0);
1423 return EFI_EXIT(EFI_SUCCESS);
1427 * Get next value of the counter.
1429 * This function implements the NextMonotonicCount service.
1430 * See the Unified Extensible Firmware Interface (UEFI) specification
1433 * @count returned value of the counter
1434 * @return status code
1436 static efi_status_t EFIAPI efi_get_next_monotonic_count(uint64_t *count)
1438 static uint64_t mono = 0;
1439 EFI_ENTRY("%p", count);
1441 return EFI_EXIT(EFI_SUCCESS);
1447 * This function implements the Stall sercive.
1448 * See the Unified Extensible Firmware Interface (UEFI) specification
1451 * @microseconds period to sleep in microseconds
1452 * @return status code
1454 static efi_status_t EFIAPI efi_stall(unsigned long microseconds)
1456 EFI_ENTRY("%ld", microseconds);
1457 udelay(microseconds);
1458 return EFI_EXIT(EFI_SUCCESS);
1462 * Reset the watchdog timer.
1464 * This function implements the SetWatchdogTimer service.
1465 * See the Unified Extensible Firmware Interface (UEFI) specification
1468 * @timeout seconds before reset by watchdog
1469 * @watchdog_code code to be logged when resetting
1470 * @data_size size of buffer in bytes
1471 * @watchdog_data buffer with data describing the reset reason
1472 * @return status code
1474 static efi_status_t EFIAPI efi_set_watchdog_timer(unsigned long timeout,
1475 uint64_t watchdog_code,
1476 unsigned long data_size,
1477 uint16_t *watchdog_data)
1479 EFI_ENTRY("%ld, 0x%"PRIx64", %ld, %p", timeout, watchdog_code,
1480 data_size, watchdog_data);
1481 return EFI_EXIT(efi_set_watchdog(timeout));
1485 * Connect a controller to a driver.
1487 * This function implements the ConnectController service.
1488 * See the Unified Extensible Firmware Interface (UEFI) specification
1491 * @controller_handle handle of the controller
1492 * @driver_image_handle handle of the driver
1493 * @remain_device_path device path of a child controller
1494 * @recursive true to connect all child controllers
1495 * @return status code
1497 static efi_status_t EFIAPI efi_connect_controller(
1498 efi_handle_t controller_handle,
1499 efi_handle_t *driver_image_handle,
1500 struct efi_device_path *remain_device_path,
1503 EFI_ENTRY("%p, %p, %p, %d", controller_handle, driver_image_handle,
1504 remain_device_path, recursive);
1505 return EFI_EXIT(EFI_NOT_FOUND);
1509 * Disconnect a controller from a driver.
1511 * This function implements the DisconnectController service.
1512 * See the Unified Extensible Firmware Interface (UEFI) specification
1515 * @controller_handle handle of the controller
1516 * @driver_image_handle handle of the driver
1517 * @child_handle handle of the child to destroy
1518 * @return status code
1520 static efi_status_t EFIAPI efi_disconnect_controller(void *controller_handle,
1521 void *driver_image_handle,
1524 EFI_ENTRY("%p, %p, %p", controller_handle, driver_image_handle,
1526 return EFI_EXIT(EFI_INVALID_PARAMETER);
1532 * This function implements the CloseProtocol service.
1533 * See the Unified Extensible Firmware Interface (UEFI) specification
1536 * @handle handle on which the protocol shall be closed
1537 * @protocol GUID of the protocol to close
1538 * @agent_handle handle of the driver
1539 * @controller_handle handle of the controller
1540 * @return status code
1542 static efi_status_t EFIAPI efi_close_protocol(void *handle,
1543 const efi_guid_t *protocol,
1545 void *controller_handle)
1547 EFI_ENTRY("%p, %pUl, %p, %p", handle, protocol, agent_handle,
1549 return EFI_EXIT(EFI_NOT_FOUND);
1553 * Provide information about then open status of a protocol on a handle
1555 * This function implements the OpenProtocolInformation service.
1556 * See the Unified Extensible Firmware Interface (UEFI) specification
1559 * @handle handle for which the information shall be retrieved
1560 * @protocol GUID of the protocol
1561 * @entry_buffer buffer to receive the open protocol information
1562 * @entry_count number of entries available in the buffer
1563 * @return status code
1565 static efi_status_t EFIAPI efi_open_protocol_information(efi_handle_t handle,
1566 const efi_guid_t *protocol,
1567 struct efi_open_protocol_info_entry **entry_buffer,
1568 efi_uintn_t *entry_count)
1570 EFI_ENTRY("%p, %pUl, %p, %p", handle, protocol, entry_buffer,
1572 return EFI_EXIT(EFI_NOT_FOUND);
1576 * Get protocols installed on a handle.
1578 * This function implements the ProtocolsPerHandleService.
1579 * See the Unified Extensible Firmware Interface (UEFI) specification
1582 * @handle handle for which the information is retrieved
1583 * @protocol_buffer buffer with protocol GUIDs
1584 * @protocol_buffer_count number of entries in the buffer
1585 * @return status code
1587 static efi_status_t EFIAPI efi_protocols_per_handle(void *handle,
1588 efi_guid_t ***protocol_buffer,
1589 efi_uintn_t *protocol_buffer_count)
1591 unsigned long buffer_size;
1592 struct efi_object *efiobj;
1594 struct list_head *lhandle;
1597 EFI_ENTRY("%p, %p, %p", handle, protocol_buffer,
1598 protocol_buffer_count);
1600 if (!handle || !protocol_buffer || !protocol_buffer_count)
1601 return EFI_EXIT(EFI_INVALID_PARAMETER);
1603 *protocol_buffer = NULL;
1604 *protocol_buffer_count = 0;
1605 list_for_each(lhandle, &efi_obj_list) {
1606 efiobj = list_entry(lhandle, struct efi_object, link);
1608 if (efiobj->handle != handle)
1611 /* Count protocols */
1612 for (i = 0; i < ARRAY_SIZE(efiobj->protocols); i++) {
1613 if (efiobj->protocols[i].guid)
1614 ++*protocol_buffer_count;
1617 if (*protocol_buffer_count) {
1618 buffer_size = sizeof(efi_guid_t *) *
1619 *protocol_buffer_count;
1620 r = efi_allocate_pool(EFI_ALLOCATE_ANY_PAGES,
1622 (void **)protocol_buffer);
1623 if (r != EFI_SUCCESS)
1626 for (i = 0; i < ARRAY_SIZE(efiobj->protocols); ++i) {
1627 if (efiobj->protocols[i].guid) {
1628 (*protocol_buffer)[j] = (void *)
1629 efiobj->protocols[i].guid;
1637 return EFI_EXIT(EFI_SUCCESS);
1641 * Locate handles implementing a protocol.
1643 * This function implements the LocateHandleBuffer service.
1644 * See the Unified Extensible Firmware Interface (UEFI) specification
1647 * @search_type selection criterion
1648 * @protocol GUID of the protocol
1649 * @search_key registration key
1650 * @no_handles number of returned handles
1651 * @buffer buffer with the returned handles
1652 * @return status code
1654 static efi_status_t EFIAPI efi_locate_handle_buffer(
1655 enum efi_locate_search_type search_type,
1656 const efi_guid_t *protocol, void *search_key,
1657 efi_uintn_t *no_handles, efi_handle_t **buffer)
1660 efi_uintn_t buffer_size = 0;
1662 EFI_ENTRY("%d, %pUl, %p, %p, %p", search_type, protocol, search_key,
1663 no_handles, buffer);
1665 if (!no_handles || !buffer) {
1666 r = EFI_INVALID_PARAMETER;
1671 r = efi_locate_handle(search_type, protocol, search_key, &buffer_size,
1673 if (r != EFI_BUFFER_TOO_SMALL)
1675 r = efi_allocate_pool(EFI_ALLOCATE_ANY_PAGES, buffer_size,
1677 if (r != EFI_SUCCESS)
1679 r = efi_locate_handle(search_type, protocol, search_key, &buffer_size,
1681 if (r == EFI_SUCCESS)
1682 *no_handles = buffer_size / sizeof(void *);
1688 * Find an interface implementing a protocol.
1690 * This function implements the LocateProtocol service.
1691 * See the Unified Extensible Firmware Interface (UEFI) specification
1694 * @protocol GUID of the protocol
1695 * @registration registration key passed to the notification function
1696 * @protocol_interface interface implementing the protocol
1697 * @return status code
1699 static efi_status_t EFIAPI efi_locate_protocol(const efi_guid_t *protocol,
1701 void **protocol_interface)
1703 struct list_head *lhandle;
1706 EFI_ENTRY("%pUl, %p, %p", protocol, registration, protocol_interface);
1708 if (!protocol || !protocol_interface)
1709 return EFI_EXIT(EFI_INVALID_PARAMETER);
1711 EFI_PRINT_GUID("protocol", protocol);
1713 list_for_each(lhandle, &efi_obj_list) {
1714 struct efi_object *efiobj;
1716 efiobj = list_entry(lhandle, struct efi_object, link);
1717 for (i = 0; i < ARRAY_SIZE(efiobj->protocols); i++) {
1718 struct efi_handler *handler = &efiobj->protocols[i];
1722 if (!guidcmp(handler->guid, protocol)) {
1723 *protocol_interface =
1724 handler->protocol_interface;
1725 return EFI_EXIT(EFI_SUCCESS);
1729 *protocol_interface = NULL;
1731 return EFI_EXIT(EFI_NOT_FOUND);
1735 * Install multiple protocol interfaces.
1737 * This function implements the MultipleProtocolInterfaces service.
1738 * See the Unified Extensible Firmware Interface (UEFI) specification
1741 * @handle handle on which the protocol interfaces shall be installed
1742 * @... NULL terminated argument list with pairs of protocol GUIDS and
1744 * @return status code
1746 static efi_status_t EFIAPI efi_install_multiple_protocol_interfaces(
1749 EFI_ENTRY("%p", handle);
1752 const efi_guid_t *protocol;
1753 void *protocol_interface;
1754 efi_status_t r = EFI_SUCCESS;
1758 return EFI_EXIT(EFI_INVALID_PARAMETER);
1760 va_start(argptr, handle);
1762 protocol = va_arg(argptr, efi_guid_t*);
1765 protocol_interface = va_arg(argptr, void*);
1766 r = EFI_CALL(efi_install_protocol_interface(
1768 EFI_NATIVE_INTERFACE,
1769 protocol_interface));
1770 if (r != EFI_SUCCESS)
1775 if (r == EFI_SUCCESS)
1778 /* If an error occurred undo all changes. */
1779 va_start(argptr, handle);
1781 protocol = va_arg(argptr, efi_guid_t*);
1782 protocol_interface = va_arg(argptr, void*);
1783 EFI_CALL(efi_uninstall_protocol_interface(handle, protocol,
1784 protocol_interface));
1792 * Uninstall multiple protocol interfaces.
1794 * This function implements the UninstallMultipleProtocolInterfaces service.
1795 * See the Unified Extensible Firmware Interface (UEFI) specification
1798 * @handle handle from which the protocol interfaces shall be removed
1799 * @... NULL terminated argument list with pairs of protocol GUIDS and
1801 * @return status code
1803 static efi_status_t EFIAPI efi_uninstall_multiple_protocol_interfaces(
1806 EFI_ENTRY("%p", handle);
1807 return EFI_EXIT(EFI_INVALID_PARAMETER);
1811 * Calculate cyclic redundancy code.
1813 * This function implements the CalculateCrc32 service.
1814 * See the Unified Extensible Firmware Interface (UEFI) specification
1817 * @data buffer with data
1818 * @data_size size of buffer in bytes
1819 * @crc32_p cyclic redundancy code
1820 * @return status code
1822 static efi_status_t EFIAPI efi_calculate_crc32(void *data,
1823 unsigned long data_size,
1826 EFI_ENTRY("%p, %ld", data, data_size);
1827 *crc32_p = crc32(0, data, data_size);
1828 return EFI_EXIT(EFI_SUCCESS);
1834 * This function implements the CopyMem service.
1835 * See the Unified Extensible Firmware Interface (UEFI) specification
1838 * @destination destination of the copy operation
1839 * @source source of the copy operation
1840 * @length number of bytes to copy
1842 static void EFIAPI efi_copy_mem(void *destination, const void *source,
1845 EFI_ENTRY("%p, %p, %ld", destination, source, (unsigned long)length);
1846 memcpy(destination, source, length);
1847 EFI_EXIT(EFI_SUCCESS);
1851 * Fill memory with a byte value.
1853 * This function implements the SetMem service.
1854 * See the Unified Extensible Firmware Interface (UEFI) specification
1857 * @buffer buffer to fill
1858 * @size size of buffer in bytes
1859 * @value byte to copy to the buffer
1861 static void EFIAPI efi_set_mem(void *buffer, size_t size, uint8_t value)
1863 EFI_ENTRY("%p, %ld, 0x%x", buffer, (unsigned long)size, value);
1864 memset(buffer, value, size);
1865 EFI_EXIT(EFI_SUCCESS);
1869 * Open protocol interface on a handle.
1871 * This function implements the OpenProtocol interface.
1872 * See the Unified Extensible Firmware Interface (UEFI) specification
1875 * @handle handle on which the protocol shall be opened
1876 * @protocol GUID of the protocol
1877 * @protocol_interface interface implementing the protocol
1878 * @agent_handle handle of the driver
1879 * @controller_handle handle of the controller
1880 * @attributes attributes indicating how to open the protocol
1881 * @return status code
1883 static efi_status_t EFIAPI efi_open_protocol(
1884 void *handle, const efi_guid_t *protocol,
1885 void **protocol_interface, void *agent_handle,
1886 void *controller_handle, uint32_t attributes)
1888 struct list_head *lhandle;
1890 efi_status_t r = EFI_INVALID_PARAMETER;
1892 EFI_ENTRY("%p, %pUl, %p, %p, %p, 0x%x", handle, protocol,
1893 protocol_interface, agent_handle, controller_handle,
1896 if (!handle || !protocol ||
1897 (!protocol_interface && attributes !=
1898 EFI_OPEN_PROTOCOL_TEST_PROTOCOL)) {
1902 EFI_PRINT_GUID("protocol", protocol);
1904 switch (attributes) {
1905 case EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL:
1906 case EFI_OPEN_PROTOCOL_GET_PROTOCOL:
1907 case EFI_OPEN_PROTOCOL_TEST_PROTOCOL:
1909 case EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER:
1910 if (controller_handle == handle)
1912 case EFI_OPEN_PROTOCOL_BY_DRIVER:
1913 case EFI_OPEN_PROTOCOL_BY_DRIVER | EFI_OPEN_PROTOCOL_EXCLUSIVE:
1914 if (controller_handle == NULL)
1916 case EFI_OPEN_PROTOCOL_EXCLUSIVE:
1917 if (agent_handle == NULL)
1924 list_for_each(lhandle, &efi_obj_list) {
1925 struct efi_object *efiobj;
1926 efiobj = list_entry(lhandle, struct efi_object, link);
1928 if (efiobj->handle != handle)
1931 for (i = 0; i < ARRAY_SIZE(efiobj->protocols); i++) {
1932 struct efi_handler *handler = &efiobj->protocols[i];
1933 const efi_guid_t *hprotocol = handler->guid;
1936 if (!guidcmp(hprotocol, protocol)) {
1938 EFI_OPEN_PROTOCOL_TEST_PROTOCOL) {
1939 *protocol_interface =
1940 handler->protocol_interface;
1950 r = EFI_UNSUPPORTED;
1956 * Get interface of a protocol on a handle.
1958 * This function implements the HandleProtocol service.
1959 * See the Unified Extensible Firmware Interface (UEFI) specification
1962 * @handle handle on which the protocol shall be opened
1963 * @protocol GUID of the protocol
1964 * @protocol_interface interface implementing the protocol
1965 * @return status code
1967 static efi_status_t EFIAPI efi_handle_protocol(void *handle,
1968 const efi_guid_t *protocol,
1969 void **protocol_interface)
1971 return efi_open_protocol(handle, protocol, protocol_interface, NULL,
1972 NULL, EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL);
1975 static const struct efi_boot_services efi_boot_services = {
1977 .headersize = sizeof(struct efi_table_hdr),
1979 .raise_tpl = efi_raise_tpl,
1980 .restore_tpl = efi_restore_tpl,
1981 .allocate_pages = efi_allocate_pages_ext,
1982 .free_pages = efi_free_pages_ext,
1983 .get_memory_map = efi_get_memory_map_ext,
1984 .allocate_pool = efi_allocate_pool_ext,
1985 .free_pool = efi_free_pool_ext,
1986 .create_event = efi_create_event_ext,
1987 .set_timer = efi_set_timer_ext,
1988 .wait_for_event = efi_wait_for_event,
1989 .signal_event = efi_signal_event_ext,
1990 .close_event = efi_close_event,
1991 .check_event = efi_check_event,
1992 .install_protocol_interface = efi_install_protocol_interface,
1993 .reinstall_protocol_interface = efi_reinstall_protocol_interface,
1994 .uninstall_protocol_interface = efi_uninstall_protocol_interface,
1995 .handle_protocol = efi_handle_protocol,
1997 .register_protocol_notify = efi_register_protocol_notify,
1998 .locate_handle = efi_locate_handle_ext,
1999 .locate_device_path = efi_locate_device_path,
2000 .install_configuration_table = efi_install_configuration_table_ext,
2001 .load_image = efi_load_image,
2002 .start_image = efi_start_image,
2004 .unload_image = efi_unload_image,
2005 .exit_boot_services = efi_exit_boot_services,
2006 .get_next_monotonic_count = efi_get_next_monotonic_count,
2008 .set_watchdog_timer = efi_set_watchdog_timer,
2009 .connect_controller = efi_connect_controller,
2010 .disconnect_controller = efi_disconnect_controller,
2011 .open_protocol = efi_open_protocol,
2012 .close_protocol = efi_close_protocol,
2013 .open_protocol_information = efi_open_protocol_information,
2014 .protocols_per_handle = efi_protocols_per_handle,
2015 .locate_handle_buffer = efi_locate_handle_buffer,
2016 .locate_protocol = efi_locate_protocol,
2017 .install_multiple_protocol_interfaces = efi_install_multiple_protocol_interfaces,
2018 .uninstall_multiple_protocol_interfaces = efi_uninstall_multiple_protocol_interfaces,
2019 .calculate_crc32 = efi_calculate_crc32,
2020 .copy_mem = efi_copy_mem,
2021 .set_mem = efi_set_mem,
2025 static uint16_t __efi_runtime_data firmware_vendor[] =
2026 { 'D','a','s',' ','U','-','b','o','o','t',0 };
2028 struct efi_system_table __efi_runtime_data systab = {
2030 .signature = EFI_SYSTEM_TABLE_SIGNATURE,
2031 .revision = 0x20005, /* 2.5 */
2032 .headersize = sizeof(struct efi_table_hdr),
2034 .fw_vendor = (long)firmware_vendor,
2035 .con_in = (void*)&efi_con_in,
2036 .con_out = (void*)&efi_con_out,
2037 .std_err = (void*)&efi_con_out,
2038 .runtime = (void*)&efi_runtime_services,
2039 .boottime = (void*)&efi_boot_services,
2041 .tables = (void*)efi_conf_table,