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 UINTN 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(UINTN new_tpl)
170 UINTN 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(UINTN 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%lx, %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%lx", 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 unsigned long *memory_map_size,
268 struct efi_mem_desc *memory_map,
269 unsigned long *map_key,
270 unsigned long *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, %ld, %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, UINTN 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, UINTN 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(unsigned long num_events,
543 struct efi_event **event,
548 EFI_ENTRY("%ld, %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 static struct efi_object *efi_search_obj(void *handle)
689 struct list_head *lhandle;
691 list_for_each(lhandle, &efi_obj_list) {
692 struct efi_object *efiobj;
694 efiobj = list_entry(lhandle, struct efi_object, link);
695 if (efiobj->handle == handle)
703 * Install protocol interface.
705 * This is the function for internal calls. For the API implementation of the
706 * InstallProtocolInterface service see function
707 * efi_install_protocol_interface_ext.
709 * @handle handle on which the protocol shall be installed
710 * @protocol GUID of the protocol to be installed
711 * @protocol_interface_type type of the interface to be installed,
712 * always EFI_NATIVE_INTERFACE
713 * @protocol_interface interface of the protocol implementation
714 * @return status code
716 static efi_status_t EFIAPI efi_install_protocol_interface(void **handle,
717 const efi_guid_t *protocol, int protocol_interface_type,
718 void *protocol_interface)
720 struct list_head *lhandle;
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 * Install protocol interface.
777 * This function implements the InstallProtocolInterface service.
778 * See the Unified Extensible Firmware Interface (UEFI) specification
781 * @handle handle on which the protocol shall be installed
782 * @protocol GUID of the protocol to be installed
783 * @protocol_interface_type type of the interface to be installed,
784 * always EFI_NATIVE_INTERFACE
785 * @protocol_interface interface of the protocol implementation
786 * @return status code
788 static efi_status_t EFIAPI efi_install_protocol_interface_ext(void **handle,
789 const efi_guid_t *protocol, int protocol_interface_type,
790 void *protocol_interface)
792 EFI_ENTRY("%p, %pUl, %d, %p", handle, protocol, protocol_interface_type,
795 return EFI_EXIT(efi_install_protocol_interface(handle, protocol,
796 protocol_interface_type,
797 protocol_interface));
801 * Reinstall protocol interface.
803 * This function implements the ReinstallProtocolInterface service.
804 * See the Unified Extensible Firmware Interface (UEFI) specification
807 * @handle handle on which the protocol shall be
809 * @protocol GUID of the protocol to be installed
810 * @old_interface interface to be removed
811 * @new_interface interface to be installed
812 * @return status code
814 static efi_status_t EFIAPI efi_reinstall_protocol_interface(void *handle,
815 const efi_guid_t *protocol, void *old_interface,
818 EFI_ENTRY("%p, %pUl, %p, %p", handle, protocol, old_interface,
820 return EFI_EXIT(EFI_ACCESS_DENIED);
824 * Uninstall protocol interface.
826 * This is the function for internal calls. For the API implementation of the
827 * UninstallProtocolInterface service see function
828 * efi_uninstall_protocol_interface_ext.
830 * @handle handle from which the protocol shall be removed
831 * @protocol GUID of the protocol to be removed
832 * @protocol_interface interface to be removed
833 * @return status code
835 static efi_status_t EFIAPI efi_uninstall_protocol_interface(void *handle,
836 const efi_guid_t *protocol, void *protocol_interface)
838 struct list_head *lhandle;
840 efi_status_t r = EFI_NOT_FOUND;
842 if (!handle || !protocol) {
843 r = EFI_INVALID_PARAMETER;
847 list_for_each(lhandle, &efi_obj_list) {
848 struct efi_object *efiobj;
849 efiobj = list_entry(lhandle, struct efi_object, link);
851 if (efiobj->handle != handle)
854 for (i = 0; i < ARRAY_SIZE(efiobj->protocols); i++) {
855 struct efi_handler *handler = &efiobj->protocols[i];
856 const efi_guid_t *hprotocol = handler->guid;
860 if (!guidcmp(hprotocol, protocol)) {
861 if (handler->protocol_interface) {
862 r = EFI_ACCESS_DENIED;
877 * Uninstall protocol interface.
879 * This function implements the UninstallProtocolInterface service.
880 * See the Unified Extensible Firmware Interface (UEFI) specification
883 * @handle handle from which the protocol shall be removed
884 * @protocol GUID of the protocol to be removed
885 * @protocol_interface interface to be removed
886 * @return status code
888 static efi_status_t EFIAPI efi_uninstall_protocol_interface_ext(void *handle,
889 const efi_guid_t *protocol, void *protocol_interface)
891 EFI_ENTRY("%p, %pUl, %p", handle, protocol, protocol_interface);
893 return EFI_EXIT(efi_uninstall_protocol_interface(handle, protocol,
894 protocol_interface));
898 * Register an event for notification when a protocol is installed.
900 * This function implements the RegisterProtocolNotify service.
901 * See the Unified Extensible Firmware Interface (UEFI) specification
904 * @protocol GUID of the protocol whose installation shall be
906 * @event event to be signaled upon installation of the protocol
907 * @registration key for retrieving the registration information
908 * @return status code
910 static efi_status_t EFIAPI efi_register_protocol_notify(
911 const efi_guid_t *protocol,
912 struct efi_event *event,
915 EFI_ENTRY("%pUl, %p, %p", protocol, event, registration);
916 return EFI_EXIT(EFI_OUT_OF_RESOURCES);
920 * Determine if an EFI handle implements a protocol.
922 * See the documentation of the LocateHandle service in the UEFI specification.
924 * @search_type selection criterion
925 * @protocol GUID of the protocol
926 * @search_key registration key
928 * @return 0 if the handle implements the protocol
930 static int efi_search(enum efi_locate_search_type search_type,
931 const efi_guid_t *protocol, void *search_key,
932 struct efi_object *efiobj)
936 switch (search_type) {
939 case by_register_notify:
942 for (i = 0; i < ARRAY_SIZE(efiobj->protocols); i++) {
943 const efi_guid_t *guid = efiobj->protocols[i].guid;
944 if (guid && !guidcmp(guid, protocol))
954 * Locate handles implementing a protocol.
956 * This function is meant for U-Boot internal calls. For the API implementation
957 * of the LocateHandle service see efi_locate_handle_ext.
959 * @search_type selection criterion
960 * @protocol GUID of the protocol
961 * @search_key registration key
962 * @buffer_size size of the buffer to receive the handles in bytes
963 * @buffer buffer to receive the relevant handles
964 * @return status code
966 static efi_status_t efi_locate_handle(
967 enum efi_locate_search_type search_type,
968 const efi_guid_t *protocol, void *search_key,
969 unsigned long *buffer_size, efi_handle_t *buffer)
971 struct list_head *lhandle;
972 unsigned long size = 0;
974 /* Count how much space we need */
975 list_for_each(lhandle, &efi_obj_list) {
976 struct efi_object *efiobj;
977 efiobj = list_entry(lhandle, struct efi_object, link);
978 if (!efi_search(search_type, protocol, search_key, efiobj)) {
979 size += sizeof(void*);
983 if (*buffer_size < size) {
985 return EFI_BUFFER_TOO_SMALL;
990 return EFI_NOT_FOUND;
992 /* Then fill the array */
993 list_for_each(lhandle, &efi_obj_list) {
994 struct efi_object *efiobj;
995 efiobj = list_entry(lhandle, struct efi_object, link);
996 if (!efi_search(search_type, protocol, search_key, efiobj)) {
997 *(buffer++) = efiobj->handle;
1005 * Locate handles implementing a protocol.
1007 * This function implements the LocateHandle service.
1008 * See the Unified Extensible Firmware Interface (UEFI) specification
1011 * @search_type selection criterion
1012 * @protocol GUID of the protocol
1013 * @search_key registration key
1014 * @buffer_size size of the buffer to receive the handles in bytes
1015 * @buffer buffer to receive the relevant handles
1016 * @return 0 if the handle implements the protocol
1018 static efi_status_t EFIAPI efi_locate_handle_ext(
1019 enum efi_locate_search_type search_type,
1020 const efi_guid_t *protocol, void *search_key,
1021 unsigned long *buffer_size, efi_handle_t *buffer)
1023 EFI_ENTRY("%d, %pUl, %p, %p, %p", search_type, protocol, search_key,
1024 buffer_size, buffer);
1026 return EFI_EXIT(efi_locate_handle(search_type, protocol, search_key,
1027 buffer_size, buffer));
1031 * Get the device path and handle of an device implementing a protocol.
1033 * This function implements the LocateDevicePath service.
1034 * See the Unified Extensible Firmware Interface (UEFI) specification
1037 * @protocol GUID of the protocol
1038 * @device_path device path
1039 * @device handle of the device
1040 * @return status code
1042 static efi_status_t EFIAPI efi_locate_device_path(
1043 const efi_guid_t *protocol,
1044 struct efi_device_path **device_path,
1045 efi_handle_t *device)
1047 struct efi_object *efiobj;
1049 EFI_ENTRY("%pUl, %p, %p", protocol, device_path, device);
1051 efiobj = efi_dp_find_obj(*device_path, device_path);
1053 return EFI_EXIT(EFI_NOT_FOUND);
1055 *device = efiobj->handle;
1057 return EFI_EXIT(EFI_SUCCESS);
1060 /* Collapses configuration table entries, removing index i */
1061 static void efi_remove_configuration_table(int i)
1063 struct efi_configuration_table *this = &efi_conf_table[i];
1064 struct efi_configuration_table *next = &efi_conf_table[i+1];
1065 struct efi_configuration_table *end = &efi_conf_table[systab.nr_tables];
1067 memmove(this, next, (ulong)end - (ulong)next);
1072 * Adds, updates, or removes a configuration table.
1074 * This function is used for internal calls. For the API implementation of the
1075 * InstallConfigurationTable service see efi_install_configuration_table_ext.
1077 * @guid GUID of the installed table
1078 * @table table to be installed
1079 * @return status code
1081 efi_status_t efi_install_configuration_table(const efi_guid_t *guid, void *table)
1085 /* Check for guid override */
1086 for (i = 0; i < systab.nr_tables; i++) {
1087 if (!guidcmp(guid, &efi_conf_table[i].guid)) {
1089 efi_conf_table[i].table = table;
1091 efi_remove_configuration_table(i);
1097 return EFI_NOT_FOUND;
1099 /* No override, check for overflow */
1100 if (i >= ARRAY_SIZE(efi_conf_table))
1101 return EFI_OUT_OF_RESOURCES;
1103 /* Add a new entry */
1104 memcpy(&efi_conf_table[i].guid, guid, sizeof(*guid));
1105 efi_conf_table[i].table = table;
1106 systab.nr_tables = i + 1;
1112 * Adds, updates, or removes a configuration table.
1114 * This function implements the InstallConfigurationTable service.
1115 * See the Unified Extensible Firmware Interface (UEFI) specification
1118 * @guid GUID of the installed table
1119 * @table table to be installed
1120 * @return status code
1122 static efi_status_t EFIAPI efi_install_configuration_table_ext(efi_guid_t *guid,
1125 EFI_ENTRY("%pUl, %p", guid, table);
1126 return EFI_EXIT(efi_install_configuration_table(guid, table));
1130 * Initialize a loaded_image_info + loaded_image_info object with correct
1131 * protocols, boot-device, etc.
1133 * @info loaded image info to be passed to the entry point of the
1135 * @obj internal object associated with the loaded image
1136 * @device_path device path of the loaded image
1137 * @file_path file path of the loaded image
1139 void efi_setup_loaded_image(struct efi_loaded_image *info, struct efi_object *obj,
1140 struct efi_device_path *device_path,
1141 struct efi_device_path *file_path)
1146 * When asking for the device path interface, return
1147 * bootefi_device_path
1149 obj->protocols[0].guid = &efi_guid_device_path;
1150 obj->protocols[0].protocol_interface = device_path;
1153 * When asking for the loaded_image interface, just
1154 * return handle which points to loaded_image_info
1156 obj->protocols[1].guid = &efi_guid_loaded_image;
1157 obj->protocols[1].protocol_interface = info;
1159 obj->protocols[2].guid = &efi_guid_console_control;
1160 obj->protocols[2].protocol_interface = (void *)&efi_console_control;
1162 obj->protocols[3].guid = &efi_guid_device_path_to_text_protocol;
1163 obj->protocols[3].protocol_interface =
1164 (void *)&efi_device_path_to_text;
1166 info->file_path = file_path;
1168 info->device_handle = efi_dp_find_obj(device_path, NULL);
1170 list_add_tail(&obj->link, &efi_obj_list);
1174 * Load an image using a file path.
1176 * @file_path the path of the image to load
1177 * @buffer buffer containing the loaded image
1178 * @return status code
1180 efi_status_t efi_load_image_from_path(struct efi_device_path *file_path,
1183 struct efi_file_info *info = NULL;
1184 struct efi_file_handle *f;
1185 static efi_status_t ret;
1188 f = efi_file_from_path(file_path);
1190 return EFI_DEVICE_ERROR;
1193 EFI_CALL(ret = f->getinfo(f, (efi_guid_t *)&efi_file_info_guid,
1195 if (ret == EFI_BUFFER_TOO_SMALL) {
1197 EFI_CALL(ret = f->getinfo(f, (efi_guid_t *)&efi_file_info_guid,
1200 if (ret != EFI_SUCCESS)
1203 ret = efi_allocate_pool(EFI_LOADER_DATA, info->file_size, buffer);
1207 EFI_CALL(ret = f->read(f, &info->file_size, *buffer));
1211 EFI_CALL(f->close(f));
1213 if (ret != EFI_SUCCESS) {
1214 efi_free_pool(*buffer);
1222 * Load an EFI image into memory.
1224 * This function implements the LoadImage service.
1225 * See the Unified Extensible Firmware Interface (UEFI) specification
1228 * @boot_policy true for request originating from the boot manager
1229 * @parent_image the calles's image handle
1230 * @file_path the path of the image to load
1231 * @source_buffer memory location from which the image is installed
1232 * @source_size size of the memory area from which the image is
1234 * @image_handle handle for the newly installed image
1235 * @return status code
1237 static efi_status_t EFIAPI efi_load_image(bool boot_policy,
1238 efi_handle_t parent_image,
1239 struct efi_device_path *file_path,
1240 void *source_buffer,
1241 unsigned long source_size,
1242 efi_handle_t *image_handle)
1244 struct efi_loaded_image *info;
1245 struct efi_object *obj;
1247 EFI_ENTRY("%d, %p, %p, %p, %ld, %p", boot_policy, parent_image,
1248 file_path, source_buffer, source_size, image_handle);
1250 info = calloc(1, sizeof(*info));
1251 obj = calloc(1, sizeof(*obj));
1253 if (!source_buffer) {
1254 struct efi_device_path *dp, *fp;
1257 ret = efi_load_image_from_path(file_path, &source_buffer);
1258 if (ret != EFI_SUCCESS) {
1261 return EFI_EXIT(ret);
1265 * split file_path which contains both the device and
1268 efi_dp_split_file_path(file_path, &dp, &fp);
1270 efi_setup_loaded_image(info, obj, dp, fp);
1272 /* In this case, file_path is the "device" path, ie.
1273 * something like a HARDWARE_DEVICE:MEMORY_MAPPED
1275 efi_setup_loaded_image(info, obj, file_path, NULL);
1278 info->reserved = efi_load_pe(source_buffer, info);
1279 if (!info->reserved) {
1282 return EFI_EXIT(EFI_UNSUPPORTED);
1285 *image_handle = info;
1287 return EFI_EXIT(EFI_SUCCESS);
1291 * Call the entry point of an image.
1293 * This function implements the StartImage service.
1294 * See the Unified Extensible Firmware Interface (UEFI) specification
1297 * @image_handle handle of the image
1298 * @exit_data_size size of the buffer
1299 * @exit_data buffer to receive the exit data of the called image
1300 * @return status code
1302 static efi_status_t EFIAPI efi_start_image(efi_handle_t image_handle,
1303 unsigned long *exit_data_size,
1306 ulong (*entry)(void *image_handle, struct efi_system_table *st);
1307 struct efi_loaded_image *info = image_handle;
1309 EFI_ENTRY("%p, %p, %p", image_handle, exit_data_size, exit_data);
1310 entry = info->reserved;
1312 efi_is_direct_boot = false;
1314 /* call the image! */
1315 if (setjmp(&info->exit_jmp)) {
1316 /* We returned from the child image */
1317 return EFI_EXIT(info->exit_status);
1320 __efi_nesting_dec();
1322 entry(image_handle, &systab);
1323 __efi_entry_check();
1324 __efi_nesting_inc();
1326 /* Should usually never get here */
1327 return EFI_EXIT(EFI_SUCCESS);
1331 * Leave an EFI application or driver.
1333 * This function implements the Exit service.
1334 * See the Unified Extensible Firmware Interface (UEFI) specification
1337 * @image_handle handle of the application or driver that is exiting
1338 * @exit_status status code
1339 * @exit_data_size size of the buffer in bytes
1340 * @exit_data buffer with data describing an error
1341 * @return status code
1343 static efi_status_t EFIAPI efi_exit(efi_handle_t image_handle,
1344 efi_status_t exit_status, unsigned long exit_data_size,
1347 struct efi_loaded_image *loaded_image_info = (void*)image_handle;
1349 EFI_ENTRY("%p, %ld, %ld, %p", image_handle, exit_status,
1350 exit_data_size, exit_data);
1352 /* Make sure entry/exit counts for EFI world cross-overs match */
1356 * But longjmp out with the U-Boot gd, not the application's, as
1357 * the other end is a setjmp call inside EFI context.
1361 loaded_image_info->exit_status = exit_status;
1362 longjmp(&loaded_image_info->exit_jmp, 1);
1364 panic("EFI application exited");
1368 * Unload an EFI image.
1370 * This function implements the UnloadImage service.
1371 * See the Unified Extensible Firmware Interface (UEFI) specification
1374 * @image_handle handle of the image to be unloaded
1375 * @return status code
1377 static efi_status_t EFIAPI efi_unload_image(void *image_handle)
1379 struct efi_object *efiobj;
1381 EFI_ENTRY("%p", image_handle);
1382 efiobj = efi_search_obj(image_handle);
1384 list_del(&efiobj->link);
1386 return EFI_EXIT(EFI_SUCCESS);
1390 * Fix up caches for EFI payloads if necessary.
1392 static void efi_exit_caches(void)
1394 #if defined(CONFIG_ARM) && !defined(CONFIG_ARM64)
1396 * Grub on 32bit ARM needs to have caches disabled before jumping into
1397 * a zImage, but does not know of all cache layers. Give it a hand.
1399 if (efi_is_direct_boot)
1400 cleanup_before_linux();
1405 * Stop boot services.
1407 * This function implements the ExitBootServices service.
1408 * See the Unified Extensible Firmware Interface (UEFI) specification
1411 * @image_handle handle of the loaded image
1412 * @map_key key of the memory map
1413 * @return status code
1415 static efi_status_t EFIAPI efi_exit_boot_services(void *image_handle,
1416 unsigned long map_key)
1420 EFI_ENTRY("%p, %ld", image_handle, map_key);
1422 /* Notify that ExitBootServices is invoked. */
1423 for (i = 0; i < ARRAY_SIZE(efi_events); ++i) {
1424 if (efi_events[i].type != EVT_SIGNAL_EXIT_BOOT_SERVICES)
1426 efi_signal_event(&efi_events[i]);
1428 /* Make sure that notification functions are not called anymore */
1429 efi_tpl = TPL_HIGH_LEVEL;
1431 /* XXX Should persist EFI variables here */
1433 board_quiesce_devices();
1435 /* Fix up caches for EFI payloads if necessary */
1438 /* This stops all lingering devices */
1439 bootm_disable_interrupts();
1441 /* Give the payload some time to boot */
1442 efi_set_watchdog(0);
1445 return EFI_EXIT(EFI_SUCCESS);
1449 * Get next value of the counter.
1451 * This function implements the NextMonotonicCount service.
1452 * See the Unified Extensible Firmware Interface (UEFI) specification
1455 * @count returned value of the counter
1456 * @return status code
1458 static efi_status_t EFIAPI efi_get_next_monotonic_count(uint64_t *count)
1460 static uint64_t mono = 0;
1461 EFI_ENTRY("%p", count);
1463 return EFI_EXIT(EFI_SUCCESS);
1469 * This function implements the Stall sercive.
1470 * See the Unified Extensible Firmware Interface (UEFI) specification
1473 * @microseconds period to sleep in microseconds
1474 * @return status code
1476 static efi_status_t EFIAPI efi_stall(unsigned long microseconds)
1478 EFI_ENTRY("%ld", microseconds);
1479 udelay(microseconds);
1480 return EFI_EXIT(EFI_SUCCESS);
1484 * Reset the watchdog timer.
1486 * This function implements the SetWatchdogTimer service.
1487 * See the Unified Extensible Firmware Interface (UEFI) specification
1490 * @timeout seconds before reset by watchdog
1491 * @watchdog_code code to be logged when resetting
1492 * @data_size size of buffer in bytes
1493 * @watchdog_data buffer with data describing the reset reason
1494 * @return status code
1496 static efi_status_t EFIAPI efi_set_watchdog_timer(unsigned long timeout,
1497 uint64_t watchdog_code,
1498 unsigned long data_size,
1499 uint16_t *watchdog_data)
1501 EFI_ENTRY("%ld, 0x%"PRIx64", %ld, %p", timeout, watchdog_code,
1502 data_size, watchdog_data);
1503 return EFI_EXIT(efi_set_watchdog(timeout));
1507 * Connect a controller to a driver.
1509 * This function implements the ConnectController service.
1510 * See the Unified Extensible Firmware Interface (UEFI) specification
1513 * @controller_handle handle of the controller
1514 * @driver_image_handle handle of the driver
1515 * @remain_device_path device path of a child controller
1516 * @recursive true to connect all child controllers
1517 * @return status code
1519 static efi_status_t EFIAPI efi_connect_controller(
1520 efi_handle_t controller_handle,
1521 efi_handle_t *driver_image_handle,
1522 struct efi_device_path *remain_device_path,
1525 EFI_ENTRY("%p, %p, %p, %d", controller_handle, driver_image_handle,
1526 remain_device_path, recursive);
1527 return EFI_EXIT(EFI_NOT_FOUND);
1531 * Disconnect a controller from a driver.
1533 * This function implements the DisconnectController service.
1534 * See the Unified Extensible Firmware Interface (UEFI) specification
1537 * @controller_handle handle of the controller
1538 * @driver_image_handle handle of the driver
1539 * @child_handle handle of the child to destroy
1540 * @return status code
1542 static efi_status_t EFIAPI efi_disconnect_controller(void *controller_handle,
1543 void *driver_image_handle,
1546 EFI_ENTRY("%p, %p, %p", controller_handle, driver_image_handle,
1548 return EFI_EXIT(EFI_INVALID_PARAMETER);
1554 * This function implements the CloseProtocol service.
1555 * See the Unified Extensible Firmware Interface (UEFI) specification
1558 * @handle handle on which the protocol shall be closed
1559 * @protocol GUID of the protocol to close
1560 * @agent_handle handle of the driver
1561 * @controller_handle handle of the controller
1562 * @return status code
1564 static efi_status_t EFIAPI efi_close_protocol(void *handle,
1565 const efi_guid_t *protocol,
1567 void *controller_handle)
1569 EFI_ENTRY("%p, %pUl, %p, %p", handle, protocol, agent_handle,
1571 return EFI_EXIT(EFI_NOT_FOUND);
1575 * Provide information about then open status of a protocol on a handle
1577 * This function implements the OpenProtocolInformation service.
1578 * See the Unified Extensible Firmware Interface (UEFI) specification
1581 * @handle handle for which the information shall be retrieved
1582 * @protocol GUID of the protocol
1583 * @entry_buffer buffer to receive the open protocol information
1584 * @entry_count number of entries available in the buffer
1585 * @return status code
1587 static efi_status_t EFIAPI efi_open_protocol_information(efi_handle_t handle,
1588 const efi_guid_t *protocol,
1589 struct efi_open_protocol_info_entry **entry_buffer,
1590 unsigned long *entry_count)
1592 EFI_ENTRY("%p, %pUl, %p, %p", handle, protocol, entry_buffer,
1594 return EFI_EXIT(EFI_NOT_FOUND);
1598 * Get protocols installed on a handle.
1600 * This function implements the ProtocolsPerHandleService.
1601 * See the Unified Extensible Firmware Interface (UEFI) specification
1604 * @handle handle for which the information is retrieved
1605 * @protocol_buffer buffer with protocol GUIDs
1606 * @protocol_buffer_count number of entries in the buffer
1607 * @return status code
1609 static efi_status_t EFIAPI efi_protocols_per_handle(void *handle,
1610 efi_guid_t ***protocol_buffer,
1611 unsigned long *protocol_buffer_count)
1613 unsigned long buffer_size;
1614 struct efi_object *efiobj;
1616 struct list_head *lhandle;
1619 EFI_ENTRY("%p, %p, %p", handle, protocol_buffer,
1620 protocol_buffer_count);
1622 if (!handle || !protocol_buffer || !protocol_buffer_count)
1623 return EFI_EXIT(EFI_INVALID_PARAMETER);
1625 *protocol_buffer = NULL;
1626 *protocol_buffer_count = 0;
1627 list_for_each(lhandle, &efi_obj_list) {
1628 efiobj = list_entry(lhandle, struct efi_object, link);
1630 if (efiobj->handle != handle)
1633 /* Count protocols */
1634 for (i = 0; i < ARRAY_SIZE(efiobj->protocols); i++) {
1635 if (efiobj->protocols[i].guid)
1636 ++*protocol_buffer_count;
1639 if (*protocol_buffer_count) {
1640 buffer_size = sizeof(efi_guid_t *) *
1641 *protocol_buffer_count;
1642 r = efi_allocate_pool(EFI_ALLOCATE_ANY_PAGES,
1644 (void **)protocol_buffer);
1645 if (r != EFI_SUCCESS)
1648 for (i = 0; i < ARRAY_SIZE(efiobj->protocols); ++i) {
1649 if (efiobj->protocols[i].guid) {
1650 (*protocol_buffer)[j] = (void *)
1651 efiobj->protocols[i].guid;
1659 return EFI_EXIT(EFI_SUCCESS);
1663 * Locate handles implementing a protocol.
1665 * This function implements the LocateHandleBuffer service.
1666 * See the Unified Extensible Firmware Interface (UEFI) specification
1669 * @search_type selection criterion
1670 * @protocol GUID of the protocol
1671 * @search_key registration key
1672 * @no_handles number of returned handles
1673 * @buffer buffer with the returned handles
1674 * @return status code
1676 static efi_status_t EFIAPI efi_locate_handle_buffer(
1677 enum efi_locate_search_type search_type,
1678 const efi_guid_t *protocol, void *search_key,
1679 unsigned long *no_handles, efi_handle_t **buffer)
1682 unsigned long buffer_size = 0;
1684 EFI_ENTRY("%d, %pUl, %p, %p, %p", search_type, protocol, search_key,
1685 no_handles, buffer);
1687 if (!no_handles || !buffer) {
1688 r = EFI_INVALID_PARAMETER;
1693 r = efi_locate_handle(search_type, protocol, search_key, &buffer_size,
1695 if (r != EFI_BUFFER_TOO_SMALL)
1697 r = efi_allocate_pool(EFI_ALLOCATE_ANY_PAGES, buffer_size,
1699 if (r != EFI_SUCCESS)
1701 r = efi_locate_handle(search_type, protocol, search_key, &buffer_size,
1703 if (r == EFI_SUCCESS)
1704 *no_handles = buffer_size / sizeof(void *);
1710 * Find an interface implementing a protocol.
1712 * This function implements the LocateProtocol service.
1713 * See the Unified Extensible Firmware Interface (UEFI) specification
1716 * @protocol GUID of the protocol
1717 * @registration registration key passed to the notification function
1718 * @protocol_interface interface implementing the protocol
1719 * @return status code
1721 static efi_status_t EFIAPI efi_locate_protocol(const efi_guid_t *protocol,
1723 void **protocol_interface)
1725 struct list_head *lhandle;
1728 EFI_ENTRY("%pUl, %p, %p", protocol, registration, protocol_interface);
1730 if (!protocol || !protocol_interface)
1731 return EFI_EXIT(EFI_INVALID_PARAMETER);
1733 EFI_PRINT_GUID("protocol", protocol);
1735 list_for_each(lhandle, &efi_obj_list) {
1736 struct efi_object *efiobj;
1738 efiobj = list_entry(lhandle, struct efi_object, link);
1739 for (i = 0; i < ARRAY_SIZE(efiobj->protocols); i++) {
1740 struct efi_handler *handler = &efiobj->protocols[i];
1744 if (!guidcmp(handler->guid, protocol)) {
1745 *protocol_interface =
1746 handler->protocol_interface;
1747 return EFI_EXIT(EFI_SUCCESS);
1751 *protocol_interface = NULL;
1753 return EFI_EXIT(EFI_NOT_FOUND);
1757 * Install multiple protocol interfaces.
1759 * This function implements the MultipleProtocolInterfaces service.
1760 * See the Unified Extensible Firmware Interface (UEFI) specification
1763 * @handle handle on which the protocol interfaces shall be installed
1764 * @... NULL terminated argument list with pairs of protocol GUIDS and
1766 * @return status code
1768 static efi_status_t EFIAPI efi_install_multiple_protocol_interfaces(
1771 EFI_ENTRY("%p", handle);
1774 const efi_guid_t *protocol;
1775 void *protocol_interface;
1776 efi_status_t r = EFI_SUCCESS;
1780 return EFI_EXIT(EFI_INVALID_PARAMETER);
1782 va_start(argptr, handle);
1784 protocol = va_arg(argptr, efi_guid_t*);
1787 protocol_interface = va_arg(argptr, void*);
1788 r = efi_install_protocol_interface(handle, protocol,
1789 EFI_NATIVE_INTERFACE,
1790 protocol_interface);
1791 if (r != EFI_SUCCESS)
1796 if (r == EFI_SUCCESS)
1799 /* If an error occured undo all changes. */
1800 va_start(argptr, handle);
1802 protocol = va_arg(argptr, efi_guid_t*);
1803 protocol_interface = va_arg(argptr, void*);
1804 efi_uninstall_protocol_interface(handle, protocol,
1805 protocol_interface);
1813 * Uninstall multiple protocol interfaces.
1815 * This function implements the UninstallMultipleProtocolInterfaces service.
1816 * See the Unified Extensible Firmware Interface (UEFI) specification
1819 * @handle handle from which the protocol interfaces shall be removed
1820 * @... NULL terminated argument list with pairs of protocol GUIDS and
1822 * @return status code
1824 static efi_status_t EFIAPI efi_uninstall_multiple_protocol_interfaces(
1827 EFI_ENTRY("%p", handle);
1828 return EFI_EXIT(EFI_INVALID_PARAMETER);
1832 * Calculate cyclic redundancy code.
1834 * This function implements the CalculateCrc32 service.
1835 * See the Unified Extensible Firmware Interface (UEFI) specification
1838 * @data buffer with data
1839 * @data_size size of buffer in bytes
1840 * @crc32_p cyclic redundancy code
1841 * @return status code
1843 static efi_status_t EFIAPI efi_calculate_crc32(void *data,
1844 unsigned long data_size,
1847 EFI_ENTRY("%p, %ld", data, data_size);
1848 *crc32_p = crc32(0, data, data_size);
1849 return EFI_EXIT(EFI_SUCCESS);
1855 * This function implements the CopyMem service.
1856 * See the Unified Extensible Firmware Interface (UEFI) specification
1859 * @destination destination of the copy operation
1860 * @source source of the copy operation
1861 * @length number of bytes to copy
1863 static void EFIAPI efi_copy_mem(void *destination, const void *source,
1866 EFI_ENTRY("%p, %p, %ld", destination, source, (unsigned long)length);
1867 memcpy(destination, source, length);
1868 EFI_EXIT(EFI_SUCCESS);
1872 * Fill memory with a byte value.
1874 * This function implements the SetMem service.
1875 * See the Unified Extensible Firmware Interface (UEFI) specification
1878 * @buffer buffer to fill
1879 * @size size of buffer in bytes
1880 * @value byte to copy to the buffer
1882 static void EFIAPI efi_set_mem(void *buffer, size_t size, uint8_t value)
1884 EFI_ENTRY("%p, %ld, 0x%x", buffer, (unsigned long)size, value);
1885 memset(buffer, value, size);
1886 EFI_EXIT(EFI_SUCCESS);
1890 * Open protocol interface on a handle.
1892 * This function implements the OpenProtocol interface.
1893 * See the Unified Extensible Firmware Interface (UEFI) specification
1896 * @handle handle on which the protocol shall be opened
1897 * @protocol GUID of the protocol
1898 * @protocol_interface interface implementing the protocol
1899 * @agent_handle handle of the driver
1900 * @controller_handle handle of the controller
1901 * @attributes attributes indicating how to open the protocol
1902 * @return status code
1904 static efi_status_t EFIAPI efi_open_protocol(
1905 void *handle, const efi_guid_t *protocol,
1906 void **protocol_interface, void *agent_handle,
1907 void *controller_handle, uint32_t attributes)
1909 struct list_head *lhandle;
1911 efi_status_t r = EFI_INVALID_PARAMETER;
1913 EFI_ENTRY("%p, %pUl, %p, %p, %p, 0x%x", handle, protocol,
1914 protocol_interface, agent_handle, controller_handle,
1917 if (!handle || !protocol ||
1918 (!protocol_interface && attributes !=
1919 EFI_OPEN_PROTOCOL_TEST_PROTOCOL)) {
1923 EFI_PRINT_GUID("protocol", protocol);
1925 switch (attributes) {
1926 case EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL:
1927 case EFI_OPEN_PROTOCOL_GET_PROTOCOL:
1928 case EFI_OPEN_PROTOCOL_TEST_PROTOCOL:
1930 case EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER:
1931 if (controller_handle == handle)
1933 case EFI_OPEN_PROTOCOL_BY_DRIVER:
1934 case EFI_OPEN_PROTOCOL_BY_DRIVER | EFI_OPEN_PROTOCOL_EXCLUSIVE:
1935 if (controller_handle == NULL)
1937 case EFI_OPEN_PROTOCOL_EXCLUSIVE:
1938 if (agent_handle == NULL)
1945 list_for_each(lhandle, &efi_obj_list) {
1946 struct efi_object *efiobj;
1947 efiobj = list_entry(lhandle, struct efi_object, link);
1949 if (efiobj->handle != handle)
1952 for (i = 0; i < ARRAY_SIZE(efiobj->protocols); i++) {
1953 struct efi_handler *handler = &efiobj->protocols[i];
1954 const efi_guid_t *hprotocol = handler->guid;
1957 if (!guidcmp(hprotocol, protocol)) {
1959 EFI_OPEN_PROTOCOL_TEST_PROTOCOL) {
1960 *protocol_interface =
1961 handler->protocol_interface;
1971 r = EFI_UNSUPPORTED;
1977 * Get interface of a protocol on a handle.
1979 * This function implements the HandleProtocol service.
1980 * See the Unified Extensible Firmware Interface (UEFI) specification
1983 * @handle handle on which the protocol shall be opened
1984 * @protocol GUID of the protocol
1985 * @protocol_interface interface implementing the protocol
1986 * @return status code
1988 static efi_status_t EFIAPI efi_handle_protocol(void *handle,
1989 const efi_guid_t *protocol,
1990 void **protocol_interface)
1992 return efi_open_protocol(handle, protocol, protocol_interface, NULL,
1993 NULL, EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL);
1996 static const struct efi_boot_services efi_boot_services = {
1998 .headersize = sizeof(struct efi_table_hdr),
2000 .raise_tpl = efi_raise_tpl,
2001 .restore_tpl = efi_restore_tpl,
2002 .allocate_pages = efi_allocate_pages_ext,
2003 .free_pages = efi_free_pages_ext,
2004 .get_memory_map = efi_get_memory_map_ext,
2005 .allocate_pool = efi_allocate_pool_ext,
2006 .free_pool = efi_free_pool_ext,
2007 .create_event = efi_create_event_ext,
2008 .set_timer = efi_set_timer_ext,
2009 .wait_for_event = efi_wait_for_event,
2010 .signal_event = efi_signal_event_ext,
2011 .close_event = efi_close_event,
2012 .check_event = efi_check_event,
2013 .install_protocol_interface = efi_install_protocol_interface_ext,
2014 .reinstall_protocol_interface = efi_reinstall_protocol_interface,
2015 .uninstall_protocol_interface = efi_uninstall_protocol_interface_ext,
2016 .handle_protocol = efi_handle_protocol,
2018 .register_protocol_notify = efi_register_protocol_notify,
2019 .locate_handle = efi_locate_handle_ext,
2020 .locate_device_path = efi_locate_device_path,
2021 .install_configuration_table = efi_install_configuration_table_ext,
2022 .load_image = efi_load_image,
2023 .start_image = efi_start_image,
2025 .unload_image = efi_unload_image,
2026 .exit_boot_services = efi_exit_boot_services,
2027 .get_next_monotonic_count = efi_get_next_monotonic_count,
2029 .set_watchdog_timer = efi_set_watchdog_timer,
2030 .connect_controller = efi_connect_controller,
2031 .disconnect_controller = efi_disconnect_controller,
2032 .open_protocol = efi_open_protocol,
2033 .close_protocol = efi_close_protocol,
2034 .open_protocol_information = efi_open_protocol_information,
2035 .protocols_per_handle = efi_protocols_per_handle,
2036 .locate_handle_buffer = efi_locate_handle_buffer,
2037 .locate_protocol = efi_locate_protocol,
2038 .install_multiple_protocol_interfaces = efi_install_multiple_protocol_interfaces,
2039 .uninstall_multiple_protocol_interfaces = efi_uninstall_multiple_protocol_interfaces,
2040 .calculate_crc32 = efi_calculate_crc32,
2041 .copy_mem = efi_copy_mem,
2042 .set_mem = efi_set_mem,
2046 static uint16_t __efi_runtime_data firmware_vendor[] =
2047 { 'D','a','s',' ','U','-','b','o','o','t',0 };
2049 struct efi_system_table __efi_runtime_data systab = {
2051 .signature = EFI_SYSTEM_TABLE_SIGNATURE,
2052 .revision = 0x20005, /* 2.5 */
2053 .headersize = sizeof(struct efi_table_hdr),
2055 .fw_vendor = (long)firmware_vendor,
2056 .con_in = (void*)&efi_con_in,
2057 .con_out = (void*)&efi_con_out,
2058 .std_err = (void*)&efi_con_out,
2059 .runtime = (void*)&efi_runtime_services,
2060 .boottime = (void*)&efi_boot_services,
2062 .tables = (void*)efi_conf_table,