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23c98c94 | 1 | /** @file\r |
504214c4 LG |
2 | UEFI Event support functions implemented in this file.\r |
3 | \r | |
54cd17e9 | 4 | Copyright (c) 2006 - 2011, Intel Corporation. All rights reserved.<BR>\r |
cd5ebaa0 | 5 | This program and the accompanying materials\r |
28a00297 | 6 | are licensed and made available under the terms and conditions of the BSD License\r |
7 | which accompanies this distribution. The full text of the license may be found at\r | |
8 | http://opensource.org/licenses/bsd-license.php\r | |
9 | \r | |
10 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
11 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
12 | \r | |
504214c4 | 13 | **/\r |
28a00297 | 14 | \r |
15 | \r | |
9c4ac31c | 16 | #include "DxeMain.h"\r |
ec90508b | 17 | #include "Event.h"\r |
28a00297 | 18 | \r |
1947c70c | 19 | ///\r |
20 | /// gEfiCurrentTpl - Current Task priority level\r | |
21 | ///\r | |
22 | EFI_TPL gEfiCurrentTpl = TPL_APPLICATION;\r | |
23 | \r | |
24 | ///\r | |
d613c2a8 | 25 | /// gEventQueueLock - Protects the event queues\r |
1947c70c | 26 | ///\r |
27 | EFI_LOCK gEventQueueLock = EFI_INITIALIZE_LOCK_VARIABLE (TPL_HIGH_LEVEL);\r | |
28 | \r | |
29 | ///\r | |
30 | /// gEventQueue - A list of event's to notify for each priority level\r | |
31 | ///\r | |
32 | LIST_ENTRY gEventQueue[TPL_HIGH_LEVEL + 1];\r | |
33 | \r | |
34 | ///\r | |
35 | /// gEventPending - A bitmask of the EventQueues that are pending\r | |
36 | ///\r | |
37 | UINTN gEventPending = 0;\r | |
38 | \r | |
39 | ///\r | |
40 | /// gEventSignalQueue - A list of events to signal based on EventGroup type\r | |
41 | ///\r | |
42 | LIST_ENTRY gEventSignalQueue = INITIALIZE_LIST_HEAD_VARIABLE (gEventSignalQueue);\r | |
43 | \r | |
44 | ///\r | |
45 | /// Enumerate the valid types\r | |
46 | ///\r | |
28a00297 | 47 | UINT32 mEventTable[] = {\r |
1947c70c | 48 | ///\r |
49 | /// 0x80000200 Timer event with a notification function that is\r | |
50 | /// queue when the event is signaled with SignalEvent()\r | |
51 | ///\r | |
28a00297 | 52 | EVT_TIMER | EVT_NOTIFY_SIGNAL,\r |
1947c70c | 53 | ///\r |
54 | /// 0x80000000 Timer event without a notification function. It can be\r | |
55 | /// signaled with SignalEvent() and checked with CheckEvent() or WaitForEvent().\r | |
56 | ///\r | |
28a00297 | 57 | EVT_TIMER,\r |
1947c70c | 58 | ///\r |
59 | /// 0x00000100 Generic event with a notification function that\r | |
60 | /// can be waited on with CheckEvent() or WaitForEvent()\r | |
61 | ///\r | |
28a00297 | 62 | EVT_NOTIFY_WAIT,\r |
1947c70c | 63 | ///\r |
64 | /// 0x00000200 Generic event with a notification function that\r | |
65 | /// is queue when the event is signaled with SignalEvent()\r | |
66 | ///\r | |
28a00297 | 67 | EVT_NOTIFY_SIGNAL,\r |
1947c70c | 68 | ///\r |
69 | /// 0x00000201 ExitBootServicesEvent.\r | |
70 | ///\r | |
28a00297 | 71 | EVT_SIGNAL_EXIT_BOOT_SERVICES,\r |
1947c70c | 72 | ///\r |
73 | /// 0x60000202 SetVirtualAddressMapEvent.\r | |
74 | ///\r | |
28a00297 | 75 | EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE,\r |
76 | \r | |
1947c70c | 77 | ///\r |
78 | /// 0x00000000 Generic event without a notification function.\r | |
79 | /// It can be signaled with SignalEvent() and checked with CheckEvent()\r | |
80 | /// or WaitForEvent().\r | |
81 | ///\r | |
28a00297 | 82 | 0x00000000,\r |
1947c70c | 83 | ///\r |
84 | /// 0x80000100 Timer event with a notification function that can be\r | |
85 | /// waited on with CheckEvent() or WaitForEvent()\r | |
86 | ///\r | |
28a00297 | 87 | EVT_TIMER | EVT_NOTIFY_WAIT,\r |
88 | };\r | |
89 | \r | |
54cd17e9 | 90 | ///\r |
91 | /// gIdleLoopEvent - Event which is signalled when the core is idle\r | |
92 | ///\r | |
93 | EFI_EVENT gIdleLoopEvent = NULL;\r | |
94 | \r | |
162ed594 | 95 | \r |
96 | /**\r | |
97 | Enter critical section by acquiring the lock on gEventQueueLock.\r | |
98 | \r | |
99 | **/\r | |
28a00297 | 100 | VOID\r |
101 | CoreAcquireEventLock (\r | |
102 | VOID\r | |
103 | )\r | |
28a00297 | 104 | {\r |
105 | CoreAcquireLock (&gEventQueueLock);\r | |
106 | }\r | |
107 | \r | |
162ed594 | 108 | \r |
109 | /**\r | |
110 | Exit critical section by releasing the lock on gEventQueueLock.\r | |
111 | \r | |
112 | **/\r | |
28a00297 | 113 | VOID\r |
114 | CoreReleaseEventLock (\r | |
115 | VOID\r | |
116 | )\r | |
28a00297 | 117 | {\r |
118 | CoreReleaseLock (&gEventQueueLock);\r | |
119 | }\r | |
120 | \r | |
121 | \r | |
28a00297 | 122 | \r |
162ed594 | 123 | /**\r |
c18f12d3 | 124 | Initializes "event" support.\r |
28a00297 | 125 | \r |
162ed594 | 126 | @retval EFI_SUCCESS Always return success\r |
28a00297 | 127 | \r |
162ed594 | 128 | **/\r |
129 | EFI_STATUS\r | |
130 | CoreInitializeEventServices (\r | |
131 | VOID\r | |
132 | )\r | |
28a00297 | 133 | {\r |
134 | UINTN Index;\r | |
135 | \r | |
136 | for (Index=0; Index <= TPL_HIGH_LEVEL; Index++) {\r | |
137 | InitializeListHead (&gEventQueue[Index]);\r | |
138 | }\r | |
139 | \r | |
140 | CoreInitializeTimer ();\r | |
141 | \r | |
54cd17e9 | 142 | CoreCreateEventEx (\r |
143 | EVT_NOTIFY_SIGNAL,\r | |
144 | TPL_NOTIFY,\r | |
145 | CoreEmptyCallbackFunction,\r | |
146 | NULL,\r | |
147 | &gIdleLoopEventGuid,\r | |
148 | &gIdleLoopEvent\r | |
149 | );\r | |
150 | \r | |
28a00297 | 151 | return EFI_SUCCESS;\r |
152 | }\r | |
153 | \r | |
154 | \r | |
28a00297 | 155 | \r |
162ed594 | 156 | /**\r |
28a00297 | 157 | Dispatches all pending events.\r |
158 | \r | |
022c6d45 | 159 | @param Priority The task priority level of event notifications\r |
162ed594 | 160 | to dispatch\r |
28a00297 | 161 | \r |
162ed594 | 162 | **/\r |
163 | VOID\r | |
164 | CoreDispatchEventNotifies (\r | |
165 | IN EFI_TPL Priority\r | |
166 | )\r | |
28a00297 | 167 | {\r |
168 | IEVENT *Event;\r | |
169 | LIST_ENTRY *Head;\r | |
170 | \r | |
171 | CoreAcquireEventLock ();\r | |
172 | ASSERT (gEventQueueLock.OwnerTpl == Priority);\r | |
173 | Head = &gEventQueue[Priority];\r | |
174 | \r | |
175 | //\r | |
176 | // Dispatch all the pending notifications\r | |
177 | //\r | |
178 | while (!IsListEmpty (Head)) {\r | |
179 | \r | |
180 | Event = CR (Head->ForwardLink, IEVENT, NotifyLink, EVENT_SIGNATURE);\r | |
181 | RemoveEntryList (&Event->NotifyLink);\r | |
182 | \r | |
183 | Event->NotifyLink.ForwardLink = NULL;\r | |
184 | \r | |
185 | //\r | |
186 | // Only clear the SIGNAL status if it is a SIGNAL type event.\r | |
187 | // WAIT type events are only cleared in CheckEvent()\r | |
188 | //\r | |
6e536468 | 189 | if ((Event->Type & EVT_NOTIFY_SIGNAL) != 0) {\r |
28a00297 | 190 | Event->SignalCount = 0;\r |
191 | }\r | |
192 | \r | |
193 | CoreReleaseEventLock ();\r | |
194 | \r | |
195 | //\r | |
196 | // Notify this event\r | |
197 | //\r | |
198 | ASSERT (Event->NotifyFunction != NULL);\r | |
199 | Event->NotifyFunction (Event, Event->NotifyContext);\r | |
200 | \r | |
201 | //\r | |
202 | // Check for next pending event\r | |
203 | //\r | |
204 | CoreAcquireEventLock ();\r | |
205 | }\r | |
206 | \r | |
207 | gEventPending &= ~(1 << Priority);\r | |
208 | CoreReleaseEventLock ();\r | |
209 | }\r | |
210 | \r | |
211 | \r | |
162ed594 | 212 | \r |
213 | /**\r | |
214 | Queues the event's notification function to fire.\r | |
215 | \r | |
216 | @param Event The Event to notify\r | |
217 | \r | |
218 | **/\r | |
28a00297 | 219 | VOID\r |
220 | CoreNotifyEvent (\r | |
221 | IN IEVENT *Event\r | |
222 | )\r | |
28a00297 | 223 | {\r |
224 | \r | |
225 | //\r | |
226 | // Event database must be locked\r | |
227 | //\r | |
228 | ASSERT_LOCKED (&gEventQueueLock);\r | |
229 | \r | |
230 | //\r | |
231 | // If the event is queued somewhere, remove it\r | |
232 | //\r | |
233 | \r | |
234 | if (Event->NotifyLink.ForwardLink != NULL) {\r | |
235 | RemoveEntryList (&Event->NotifyLink);\r | |
236 | Event->NotifyLink.ForwardLink = NULL;\r | |
237 | }\r | |
238 | \r | |
239 | //\r | |
240 | // Queue the event to the pending notification list\r | |
241 | //\r | |
242 | \r | |
243 | InsertTailList (&gEventQueue[Event->NotifyTpl], &Event->NotifyLink);\r | |
244 | gEventPending |= (UINTN)(1 << Event->NotifyTpl);\r | |
245 | }\r | |
246 | \r | |
247 | \r | |
248 | \r | |
162ed594 | 249 | \r |
250 | /**\r | |
251 | Signals all events in the EventGroup.\r | |
252 | \r | |
253 | @param EventGroup The list to signal\r | |
254 | \r | |
255 | **/\r | |
28a00297 | 256 | VOID\r |
257 | CoreNotifySignalList (\r | |
258 | IN EFI_GUID *EventGroup\r | |
259 | )\r | |
28a00297 | 260 | {\r |
261 | LIST_ENTRY *Link;\r | |
262 | LIST_ENTRY *Head;\r | |
263 | IEVENT *Event;\r | |
264 | \r | |
265 | CoreAcquireEventLock ();\r | |
266 | \r | |
267 | Head = &gEventSignalQueue;\r | |
268 | for (Link = Head->ForwardLink; Link != Head; Link = Link->ForwardLink) {\r | |
269 | Event = CR (Link, IEVENT, SignalLink, EVENT_SIGNATURE);\r | |
270 | if (CompareGuid (&Event->EventGroup, EventGroup)) {\r | |
271 | CoreNotifyEvent (Event);\r | |
272 | }\r | |
273 | }\r | |
274 | \r | |
275 | CoreReleaseEventLock ();\r | |
276 | }\r | |
277 | \r | |
162ed594 | 278 | \r |
279 | /**\r | |
280 | Creates a general-purpose event structure.\r | |
281 | \r | |
022c6d45 | 282 | @param Type The type of event to create and its mode and\r |
283 | attributes\r | |
284 | @param NotifyTpl The task priority level of event notifications\r | |
285 | @param NotifyFunction Pointer to the events notification function\r | |
286 | @param NotifyContext Pointer to the notification functions context;\r | |
287 | corresponds to parameter "Context" in the\r | |
288 | notification function\r | |
289 | @param Event Pointer to the newly created event if the call\r | |
290 | succeeds; undefined otherwise\r | |
291 | \r | |
292 | @retval EFI_SUCCESS The event structure was created\r | |
293 | @retval EFI_INVALID_PARAMETER One of the parameters has an invalid value\r | |
162ed594 | 294 | @retval EFI_OUT_OF_RESOURCES The event could not be allocated\r |
295 | \r | |
296 | **/\r | |
28a00297 | 297 | EFI_STATUS\r |
298 | EFIAPI\r | |
299 | CoreCreateEvent (\r | |
300 | IN UINT32 Type,\r | |
301 | IN EFI_TPL NotifyTpl,\r | |
302 | IN EFI_EVENT_NOTIFY NotifyFunction, OPTIONAL\r | |
303 | IN VOID *NotifyContext, OPTIONAL\r | |
304 | OUT EFI_EVENT *Event\r | |
305 | )\r | |
28a00297 | 306 | {\r |
bb8ffffd | 307 | return CoreCreateEventEx (Type, NotifyTpl, NotifyFunction, NotifyContext, NULL, Event);\r |
28a00297 | 308 | }\r |
309 | \r | |
310 | \r | |
162ed594 | 311 | \r |
312 | /**\r | |
313 | Creates a general-purpose event structure\r | |
314 | \r | |
022c6d45 | 315 | @param Type The type of event to create and its mode and\r |
316 | attributes\r | |
317 | @param NotifyTpl The task priority level of event notifications\r | |
318 | @param NotifyFunction Pointer to the events notification function\r | |
319 | @param NotifyContext Pointer to the notification functions context;\r | |
320 | corresponds to parameter "Context" in the\r | |
321 | notification function\r | |
322 | @param EventGroup GUID for EventGroup if NULL act the same as\r | |
323 | gBS->CreateEvent().\r | |
324 | @param Event Pointer to the newly created event if the call\r | |
325 | succeeds; undefined otherwise\r | |
326 | \r | |
327 | @retval EFI_SUCCESS The event structure was created\r | |
328 | @retval EFI_INVALID_PARAMETER One of the parameters has an invalid value\r | |
162ed594 | 329 | @retval EFI_OUT_OF_RESOURCES The event could not be allocated\r |
330 | \r | |
331 | **/\r | |
28a00297 | 332 | EFI_STATUS\r |
333 | EFIAPI\r | |
334 | CoreCreateEventEx (\r | |
335 | IN UINT32 Type,\r | |
336 | IN EFI_TPL NotifyTpl,\r | |
337 | IN EFI_EVENT_NOTIFY NotifyFunction, OPTIONAL\r | |
338 | IN CONST VOID *NotifyContext, OPTIONAL\r | |
339 | IN CONST EFI_GUID *EventGroup, OPTIONAL\r | |
340 | OUT EFI_EVENT *Event\r | |
341 | )\r | |
28a00297 | 342 | {\r |
343 | EFI_STATUS Status;\r | |
344 | IEVENT *IEvent;\r | |
345 | INTN Index;\r | |
346 | \r | |
347 | \r | |
51b02d81 | 348 | if (Event == NULL) {\r |
28a00297 | 349 | return EFI_INVALID_PARAMETER;\r |
350 | }\r | |
351 | \r | |
352 | //\r | |
353 | // Check to make sure no reserved flags are set\r | |
354 | //\r | |
355 | Status = EFI_INVALID_PARAMETER;\r | |
356 | for (Index = 0; Index < (sizeof (mEventTable) / sizeof (UINT32)); Index++) {\r | |
357 | if (Type == mEventTable[Index]) {\r | |
358 | Status = EFI_SUCCESS;\r | |
359 | break;\r | |
360 | }\r | |
361 | }\r | |
362 | if(EFI_ERROR (Status)) {\r | |
363 | return EFI_INVALID_PARAMETER;\r | |
364 | }\r | |
365 | \r | |
bb8ffffd | 366 | //\r |
367 | // Convert Event type for pre-defined Event groups\r | |
368 | //\r | |
369 | if (EventGroup != NULL) {\r | |
370 | //\r | |
371 | // For event group, type EVT_SIGNAL_EXIT_BOOT_SERVICES and EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE\r | |
372 | // are not valid\r | |
373 | //\r | |
374 | if ((Type == EVT_SIGNAL_EXIT_BOOT_SERVICES) || (Type == EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE)) {\r | |
375 | return EFI_INVALID_PARAMETER;\r | |
376 | }\r | |
377 | if (CompareGuid (EventGroup, &gEfiEventExitBootServicesGuid)) {\r | |
378 | Type = EVT_SIGNAL_EXIT_BOOT_SERVICES;\r | |
379 | } else if (CompareGuid (EventGroup, &gEfiEventVirtualAddressChangeGuid)) {\r | |
380 | Type = EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE;\r | |
381 | }\r | |
382 | } else {\r | |
383 | //\r | |
384 | // Convert EFI 1.10 Events to their UEFI 2.0 CreateEventEx mapping\r | |
385 | //\r | |
386 | if (Type == EVT_SIGNAL_EXIT_BOOT_SERVICES) {\r | |
387 | EventGroup = &gEfiEventExitBootServicesGuid;\r | |
388 | } else if (Type == EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE) {\r | |
389 | EventGroup = &gEfiEventVirtualAddressChangeGuid;\r | |
390 | }\r | |
391 | }\r | |
392 | \r | |
28a00297 | 393 | //\r |
394 | // If it's a notify type of event, check its parameters\r | |
395 | //\r | |
71f68914 | 396 | if ((Type & (EVT_NOTIFY_WAIT | EVT_NOTIFY_SIGNAL)) != 0) {\r |
28a00297 | 397 | //\r |
398 | // Check for an invalid NotifyFunction or NotifyTpl\r | |
399 | //\r | |
400 | if ((NotifyFunction == NULL) ||\r | |
51b02d81 | 401 | (NotifyTpl <= TPL_APPLICATION) ||\r |
28a00297 | 402 | (NotifyTpl >= TPL_HIGH_LEVEL)) {\r |
403 | return EFI_INVALID_PARAMETER;\r | |
404 | }\r | |
405 | \r | |
406 | } else {\r | |
407 | //\r | |
408 | // No notification needed, zero ignored values\r | |
409 | //\r | |
410 | NotifyTpl = 0;\r | |
411 | NotifyFunction = NULL;\r | |
412 | NotifyContext = NULL;\r | |
413 | }\r | |
414 | \r | |
415 | //\r | |
b364eeb0 | 416 | // Allocate and initialize a new event structure.\r |
28a00297 | 417 | //\r |
b364eeb0 | 418 | if ((Type & EVT_RUNTIME) != 0) {\r |
419 | IEvent = AllocateRuntimeZeroPool (sizeof (IEVENT));\r | |
420 | } else {\r | |
421 | IEvent = AllocateZeroPool (sizeof (IEVENT));\r | |
422 | }\r | |
423 | if (IEvent == NULL) {\r | |
28a00297 | 424 | return EFI_OUT_OF_RESOURCES;\r |
425 | }\r | |
426 | \r | |
28a00297 | 427 | IEvent->Signature = EVENT_SIGNATURE;\r |
428 | IEvent->Type = Type;\r | |
429 | \r | |
430 | IEvent->NotifyTpl = NotifyTpl;\r | |
431 | IEvent->NotifyFunction = NotifyFunction;\r | |
432 | IEvent->NotifyContext = (VOID *)NotifyContext;\r | |
433 | if (EventGroup != NULL) {\r | |
434 | CopyGuid (&IEvent->EventGroup, EventGroup);\r | |
435 | IEvent->ExFlag = TRUE;\r | |
436 | }\r | |
437 | \r | |
438 | *Event = IEvent;\r | |
439 | \r | |
71f68914 | 440 | if ((Type & EVT_RUNTIME) != 0) {\r |
28a00297 | 441 | //\r |
442 | // Keep a list of all RT events so we can tell the RT AP.\r | |
443 | //\r | |
444 | IEvent->RuntimeData.Type = Type;\r | |
445 | IEvent->RuntimeData.NotifyTpl = NotifyTpl;\r | |
446 | IEvent->RuntimeData.NotifyFunction = NotifyFunction;\r | |
447 | IEvent->RuntimeData.NotifyContext = (VOID *) NotifyContext;\r | |
448 | IEvent->RuntimeData.Event = (EFI_EVENT *) IEvent;\r | |
449 | InsertTailList (&gRuntime->EventHead, &IEvent->RuntimeData.Link);\r | |
450 | }\r | |
451 | \r | |
452 | CoreAcquireEventLock ();\r | |
453 | \r | |
454 | if ((Type & EVT_NOTIFY_SIGNAL) != 0x00000000) {\r | |
455 | //\r | |
456 | // The Event's NotifyFunction must be queued whenever the event is signaled\r | |
457 | //\r | |
458 | InsertHeadList (&gEventSignalQueue, &IEvent->SignalLink);\r | |
459 | }\r | |
460 | \r | |
461 | CoreReleaseEventLock ();\r | |
462 | \r | |
463 | //\r | |
464 | // Done\r | |
465 | //\r | |
466 | return EFI_SUCCESS;\r | |
467 | }\r | |
468 | \r | |
469 | \r | |
470 | \r | |
28a00297 | 471 | \r |
162ed594 | 472 | /**\r |
e94a9ff7 | 473 | Signals the event. Queues the event to be notified if needed.\r |
28a00297 | 474 | \r |
e94a9ff7 | 475 | @param UserEvent The event to signal .\r |
28a00297 | 476 | \r |
022c6d45 | 477 | @retval EFI_INVALID_PARAMETER Parameters are not valid.\r |
162ed594 | 478 | @retval EFI_SUCCESS The event was signaled.\r |
28a00297 | 479 | \r |
162ed594 | 480 | **/\r |
481 | EFI_STATUS\r | |
482 | EFIAPI\r | |
483 | CoreSignalEvent (\r | |
484 | IN EFI_EVENT UserEvent\r | |
485 | )\r | |
28a00297 | 486 | {\r |
487 | IEVENT *Event;\r | |
488 | \r | |
489 | Event = UserEvent;\r | |
490 | \r | |
491 | if (Event == NULL) {\r | |
492 | return EFI_INVALID_PARAMETER;\r | |
493 | }\r | |
494 | \r | |
495 | if (Event->Signature != EVENT_SIGNATURE) {\r | |
496 | return EFI_INVALID_PARAMETER;\r | |
497 | }\r | |
498 | \r | |
499 | CoreAcquireEventLock ();\r | |
500 | \r | |
501 | //\r | |
502 | // If the event is not already signalled, do so\r | |
503 | //\r | |
504 | \r | |
505 | if (Event->SignalCount == 0x00000000) {\r | |
506 | Event->SignalCount++;\r | |
507 | \r | |
508 | //\r | |
509 | // If signalling type is a notify function, queue it\r | |
510 | //\r | |
6e536468 | 511 | if ((Event->Type & EVT_NOTIFY_SIGNAL) != 0) {\r |
28a00297 | 512 | if (Event->ExFlag) {\r |
513 | //\r | |
514 | // The CreateEventEx() style requires all members of the Event Group\r | |
515 | // to be signaled.\r | |
516 | //\r | |
517 | CoreReleaseEventLock ();\r | |
518 | CoreNotifySignalList (&Event->EventGroup);\r | |
519 | CoreAcquireEventLock ();\r | |
520 | } else {\r | |
521 | CoreNotifyEvent (Event);\r | |
522 | }\r | |
523 | }\r | |
524 | }\r | |
525 | \r | |
526 | CoreReleaseEventLock ();\r | |
527 | return EFI_SUCCESS;\r | |
528 | }\r | |
529 | \r | |
530 | \r | |
162ed594 | 531 | \r |
532 | /**\r | |
533 | Check the status of an event.\r | |
534 | \r | |
022c6d45 | 535 | @param UserEvent The event to check\r |
162ed594 | 536 | \r |
022c6d45 | 537 | @retval EFI_SUCCESS The event is in the signaled state\r |
538 | @retval EFI_NOT_READY The event is not in the signaled state\r | |
162ed594 | 539 | @retval EFI_INVALID_PARAMETER Event is of type EVT_NOTIFY_SIGNAL\r |
540 | \r | |
541 | **/\r | |
28a00297 | 542 | EFI_STATUS\r |
543 | EFIAPI\r | |
544 | CoreCheckEvent (\r | |
545 | IN EFI_EVENT UserEvent\r | |
546 | )\r | |
28a00297 | 547 | {\r |
548 | IEVENT *Event;\r | |
549 | EFI_STATUS Status;\r | |
550 | \r | |
551 | Event = UserEvent;\r | |
552 | \r | |
553 | if (Event == NULL) {\r | |
554 | return EFI_INVALID_PARAMETER;\r | |
555 | }\r | |
556 | \r | |
557 | if (Event->Signature != EVENT_SIGNATURE) {\r | |
558 | return EFI_INVALID_PARAMETER;\r | |
559 | }\r | |
560 | \r | |
e94a9ff7 | 561 | if ((Event->Type & EVT_NOTIFY_SIGNAL) != 0) {\r |
28a00297 | 562 | return EFI_INVALID_PARAMETER;\r |
563 | }\r | |
564 | \r | |
565 | Status = EFI_NOT_READY;\r | |
566 | \r | |
6e536468 | 567 | if ((Event->SignalCount == 0) && ((Event->Type & EVT_NOTIFY_WAIT) != 0)) {\r |
28a00297 | 568 | \r |
569 | //\r | |
570 | // Queue the wait notify function\r | |
571 | //\r | |
28a00297 | 572 | CoreAcquireEventLock ();\r |
6e536468 | 573 | if (Event->SignalCount == 0) {\r |
28a00297 | 574 | CoreNotifyEvent (Event);\r |
575 | }\r | |
576 | CoreReleaseEventLock ();\r | |
577 | }\r | |
578 | \r | |
579 | //\r | |
580 | // If the even looks signalled, get the lock and clear it\r | |
581 | //\r | |
582 | \r | |
6e536468 | 583 | if (Event->SignalCount != 0) {\r |
28a00297 | 584 | CoreAcquireEventLock ();\r |
585 | \r | |
6e536468 | 586 | if (Event->SignalCount != 0) {\r |
28a00297 | 587 | Event->SignalCount = 0;\r |
588 | Status = EFI_SUCCESS;\r | |
589 | }\r | |
590 | \r | |
591 | CoreReleaseEventLock ();\r | |
592 | }\r | |
593 | \r | |
594 | return Status;\r | |
595 | }\r | |
596 | \r | |
597 | \r | |
598 | \r | |
162ed594 | 599 | /**\r |
600 | Stops execution until an event is signaled.\r | |
601 | \r | |
022c6d45 | 602 | @param NumberOfEvents The number of events in the UserEvents array\r |
603 | @param UserEvents An array of EFI_EVENT\r | |
604 | @param UserIndex Pointer to the index of the event which\r | |
605 | satisfied the wait condition\r | |
162ed594 | 606 | \r |
022c6d45 | 607 | @retval EFI_SUCCESS The event indicated by Index was signaled.\r |
608 | @retval EFI_INVALID_PARAMETER The event indicated by Index has a notification\r | |
609 | function or Event was not a valid type\r | |
162ed594 | 610 | @retval EFI_UNSUPPORTED The current TPL is not TPL_APPLICATION\r |
611 | \r | |
612 | **/\r | |
28a00297 | 613 | EFI_STATUS\r |
614 | EFIAPI\r | |
615 | CoreWaitForEvent (\r | |
616 | IN UINTN NumberOfEvents,\r | |
617 | IN EFI_EVENT *UserEvents,\r | |
618 | OUT UINTN *UserIndex\r | |
619 | )\r | |
28a00297 | 620 | {\r |
621 | EFI_STATUS Status;\r | |
622 | UINTN Index;\r | |
623 | \r | |
624 | //\r | |
625 | // Can only WaitForEvent at TPL_APPLICATION\r | |
626 | //\r | |
627 | if (gEfiCurrentTpl != TPL_APPLICATION) {\r | |
628 | return EFI_UNSUPPORTED;\r | |
629 | }\r | |
630 | \r | |
631 | for(;;) {\r | |
632 | \r | |
633 | for(Index = 0; Index < NumberOfEvents; Index++) {\r | |
634 | \r | |
635 | Status = CoreCheckEvent (UserEvents[Index]);\r | |
636 | \r | |
637 | //\r | |
638 | // provide index of event that caused problem\r | |
639 | //\r | |
640 | if (Status != EFI_NOT_READY) {\r | |
641 | *UserIndex = Index;\r | |
642 | return Status;\r | |
643 | }\r | |
644 | }\r | |
645 | \r | |
646 | //\r | |
54cd17e9 | 647 | // Signal the Idle event\r |
28a00297 | 648 | //\r |
54cd17e9 | 649 | CoreSignalEvent (gIdleLoopEvent);\r |
28a00297 | 650 | }\r |
651 | }\r | |
652 | \r | |
653 | \r | |
162ed594 | 654 | /**\r |
28a00297 | 655 | Closes an event and frees the event structure.\r |
656 | \r | |
022c6d45 | 657 | @param UserEvent Event to close\r |
28a00297 | 658 | \r |
022c6d45 | 659 | @retval EFI_INVALID_PARAMETER Parameters are not valid.\r |
162ed594 | 660 | @retval EFI_SUCCESS The event has been closed\r |
28a00297 | 661 | \r |
162ed594 | 662 | **/\r |
663 | EFI_STATUS\r | |
664 | EFIAPI\r | |
665 | CoreCloseEvent (\r | |
666 | IN EFI_EVENT UserEvent\r | |
667 | )\r | |
28a00297 | 668 | {\r |
669 | EFI_STATUS Status;\r | |
670 | IEVENT *Event;\r | |
671 | \r | |
672 | Event = UserEvent;\r | |
673 | \r | |
674 | if (Event == NULL) {\r | |
675 | return EFI_INVALID_PARAMETER;\r | |
676 | }\r | |
677 | \r | |
678 | if (Event->Signature != EVENT_SIGNATURE) {\r | |
679 | return EFI_INVALID_PARAMETER;\r | |
680 | }\r | |
681 | \r | |
682 | //\r | |
683 | // If it's a timer event, make sure it's not pending\r | |
684 | //\r | |
e94a9ff7 | 685 | if ((Event->Type & EVT_TIMER) != 0) {\r |
28a00297 | 686 | CoreSetTimer (Event, TimerCancel, 0);\r |
687 | }\r | |
688 | \r | |
689 | CoreAcquireEventLock ();\r | |
690 | \r | |
691 | //\r | |
692 | // If the event is queued somewhere, remove it\r | |
693 | //\r | |
694 | \r | |
695 | if (Event->RuntimeData.Link.ForwardLink != NULL) {\r | |
696 | RemoveEntryList (&Event->RuntimeData.Link);\r | |
697 | }\r | |
698 | \r | |
699 | if (Event->NotifyLink.ForwardLink != NULL) {\r | |
700 | RemoveEntryList (&Event->NotifyLink);\r | |
701 | }\r | |
702 | \r | |
703 | if (Event->SignalLink.ForwardLink != NULL) {\r | |
704 | RemoveEntryList (&Event->SignalLink);\r | |
705 | }\r | |
706 | \r | |
707 | CoreReleaseEventLock ();\r | |
708 | \r | |
709 | //\r | |
710 | // If the event is registered on a protocol notify, then remove it from the protocol database\r | |
711 | //\r | |
712 | CoreUnregisterProtocolNotify (Event);\r | |
713 | \r | |
714 | Status = CoreFreePool (Event);\r | |
715 | ASSERT_EFI_ERROR (Status);\r | |
716 | \r | |
717 | return Status;\r | |
718 | }\r | |
54cd17e9 | 719 | \r |