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878ddf1f | 1 | /*++\r |
2 | \r | |
3 | Copyright (c) 2006, Intel Corporation \r | |
4 | All rights reserved. This program and the accompanying materials \r | |
5 | are licensed and made available under the terms and conditions of the BSD License \r | |
6 | which accompanies this distribution. The full text of the license may be found at \r | |
7 | http://opensource.org/licenses/bsd-license.php \r | |
8 | \r | |
9 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, \r | |
10 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. \r | |
11 | \r | |
12 | Module Name:\r | |
13 | \r | |
14 | timer.c\r | |
15 | \r | |
16 | Abstract:\r | |
17 | \r | |
18 | EFI Event support\r | |
19 | \r | |
20 | Revision History\r | |
21 | \r | |
22 | --*/\r | |
23 | \r | |
24 | \r | |
25 | #include <DxeMain.h>\r | |
26 | \r | |
27 | //\r | |
28 | // Internal prototypes\r | |
29 | //\r | |
30 | STATIC\r | |
31 | UINT64\r | |
32 | CoreCurrentSystemTime (\r | |
33 | VOID\r | |
34 | );\r | |
35 | \r | |
36 | VOID\r | |
37 | EFIAPI\r | |
38 | CoreCheckTimers (\r | |
39 | IN EFI_EVENT Event,\r | |
40 | IN VOID *Context\r | |
41 | );\r | |
42 | \r | |
43 | STATIC\r | |
44 | VOID\r | |
45 | CoreInsertEventTimer (\r | |
46 | IN IEVENT *Event\r | |
47 | );\r | |
48 | \r | |
49 | //\r | |
50 | // Internal data\r | |
51 | //\r | |
52 | \r | |
53 | static LIST_ENTRY mEfiTimerList = INITIALIZE_LIST_HEAD_VARIABLE (mEfiTimerList);\r | |
54 | static EFI_LOCK mEfiTimerLock = EFI_INITIALIZE_LOCK_VARIABLE (EFI_TPL_HIGH_LEVEL - 1);\r | |
55 | static EFI_EVENT mEfiCheckTimerEvent;\r | |
56 | \r | |
57 | static EFI_LOCK mEfiSystemTimeLock = EFI_INITIALIZE_LOCK_VARIABLE (EFI_TPL_HIGH_LEVEL);\r | |
58 | static UINT64 mEfiSystemTime = 0;\r | |
59 | \r | |
60 | //\r | |
61 | // Timer functions\r | |
62 | //\r | |
63 | \r | |
64 | VOID\r | |
65 | CoreInitializeTimer (\r | |
66 | VOID\r | |
67 | )\r | |
68 | /*++\r | |
69 | \r | |
70 | Routine Description:\r | |
71 | \r | |
72 | Initializes timer support\r | |
73 | \r | |
74 | Arguments:\r | |
75 | \r | |
76 | None\r | |
77 | \r | |
78 | Returns:\r | |
79 | \r | |
80 | None\r | |
81 | \r | |
82 | --*/\r | |
83 | {\r | |
84 | EFI_STATUS Status;\r | |
85 | \r | |
86 | Status = CoreCreateEvent (\r | |
87 | EFI_EVENT_NOTIFY_SIGNAL,\r | |
88 | EFI_TPL_HIGH_LEVEL - 1,\r | |
89 | CoreCheckTimers,\r | |
90 | NULL,\r | |
91 | &mEfiCheckTimerEvent\r | |
92 | );\r | |
93 | ASSERT_EFI_ERROR (Status);\r | |
94 | }\r | |
95 | \r | |
96 | STATIC\r | |
97 | UINT64\r | |
98 | CoreCurrentSystemTime (\r | |
99 | VOID\r | |
100 | )\r | |
101 | /*++\r | |
102 | \r | |
103 | Routine Description:\r | |
104 | \r | |
105 | Returns the current system time\r | |
106 | \r | |
107 | Arguments:\r | |
108 | \r | |
109 | None\r | |
110 | \r | |
111 | Returns:\r | |
112 | \r | |
113 | Returns the current system time\r | |
114 | \r | |
115 | --*/\r | |
116 | {\r | |
117 | UINT64 SystemTime;\r | |
118 | \r | |
119 | CoreAcquireLock (&mEfiSystemTimeLock);\r | |
120 | SystemTime = mEfiSystemTime;\r | |
121 | CoreReleaseLock (&mEfiSystemTimeLock);\r | |
122 | return SystemTime;\r | |
123 | }\r | |
124 | \r | |
125 | VOID\r | |
126 | EFIAPI\r | |
127 | CoreTimerTick (\r | |
128 | IN UINT64 Duration\r | |
129 | )\r | |
130 | /*++\r | |
131 | \r | |
132 | Routine Description:\r | |
133 | \r | |
134 | Called by the platform code to process a tick.\r | |
135 | \r | |
136 | Arguments:\r | |
137 | \r | |
138 | Duration - The number of 100ns elasped since the last call to TimerTick\r | |
139 | \r | |
140 | Returns:\r | |
141 | \r | |
142 | None\r | |
143 | \r | |
144 | --*/\r | |
145 | {\r | |
146 | IEVENT *Event;\r | |
147 | \r | |
148 | //\r | |
149 | // Check runtiem flag in case there are ticks while exiting boot services\r | |
150 | //\r | |
151 | \r | |
152 | CoreAcquireLock (&mEfiSystemTimeLock);\r | |
153 | \r | |
154 | //\r | |
155 | // Update the system time\r | |
156 | //\r | |
157 | \r | |
158 | mEfiSystemTime += Duration;\r | |
159 | \r | |
160 | //\r | |
161 | // If the head of the list is expired, fire the timer event\r | |
162 | // to process it\r | |
163 | //\r | |
164 | \r | |
165 | if (!IsListEmpty (&mEfiTimerList)) {\r | |
166 | Event = CR (mEfiTimerList.ForwardLink, IEVENT, u.Timer.Link, EVENT_SIGNATURE);\r | |
167 | \r | |
168 | if (Event->u.Timer.TriggerTime <= mEfiSystemTime) {\r | |
169 | CoreSignalEvent (mEfiCheckTimerEvent);\r | |
170 | }\r | |
171 | }\r | |
172 | \r | |
173 | CoreReleaseLock (&mEfiSystemTimeLock);\r | |
174 | }\r | |
175 | \r | |
176 | VOID\r | |
177 | EFIAPI\r | |
178 | CoreCheckTimers (\r | |
179 | IN EFI_EVENT CheckEvent,\r | |
180 | IN VOID *Context\r | |
181 | )\r | |
182 | /*++\r | |
183 | \r | |
184 | Routine Description:\r | |
185 | \r | |
186 | Checks the sorted timer list against the current system time.\r | |
187 | Signals any expired event timer.\r | |
188 | \r | |
189 | Arguments:\r | |
190 | \r | |
191 | CheckEvent - Not used\r | |
192 | \r | |
193 | Context - Not used\r | |
194 | \r | |
195 | Returns:\r | |
196 | \r | |
197 | None\r | |
198 | \r | |
199 | --*/\r | |
200 | {\r | |
201 | UINT64 SystemTime;\r | |
202 | IEVENT *Event;\r | |
203 | \r | |
204 | //\r | |
205 | // Check the timer database for expired timers\r | |
206 | //\r | |
207 | \r | |
208 | CoreAcquireLock (&mEfiTimerLock);\r | |
209 | SystemTime = CoreCurrentSystemTime ();\r | |
210 | \r | |
211 | while (!IsListEmpty (&mEfiTimerList)) {\r | |
212 | Event = CR (mEfiTimerList.ForwardLink, IEVENT, u.Timer.Link, EVENT_SIGNATURE);\r | |
213 | \r | |
214 | //\r | |
215 | // If this timer is not expired, then we're done\r | |
216 | //\r | |
217 | \r | |
218 | if (Event->u.Timer.TriggerTime > SystemTime) {\r | |
219 | break;\r | |
220 | }\r | |
221 | \r | |
222 | //\r | |
223 | // Remove this timer from the timer queue\r | |
224 | //\r | |
225 | \r | |
226 | RemoveEntryList (&Event->u.Timer.Link);\r | |
227 | Event->u.Timer.Link.ForwardLink = NULL;\r | |
228 | \r | |
229 | //\r | |
230 | // Signal it\r | |
231 | //\r | |
232 | CoreSignalEvent (Event);\r | |
233 | \r | |
234 | //\r | |
235 | // If this is a periodic timer, set it\r | |
236 | //\r | |
237 | if (Event->u.Timer.Period) {\r | |
238 | \r | |
239 | //\r | |
240 | // Compute the timers new trigger time\r | |
241 | //\r | |
242 | \r | |
243 | Event->u.Timer.TriggerTime = Event->u.Timer.TriggerTime + Event->u.Timer.Period;\r | |
244 | \r | |
245 | //\r | |
246 | // If that's before now, then reset the timer to start from now\r | |
247 | //\r | |
248 | if (Event->u.Timer.TriggerTime <= SystemTime) {\r | |
249 | Event->u.Timer.TriggerTime = SystemTime;\r | |
250 | CoreSignalEvent (mEfiCheckTimerEvent);\r | |
251 | }\r | |
252 | \r | |
253 | //\r | |
254 | // Add the timer\r | |
255 | //\r | |
256 | \r | |
257 | CoreInsertEventTimer (Event);\r | |
258 | }\r | |
259 | }\r | |
260 | \r | |
261 | CoreReleaseLock (&mEfiTimerLock);\r | |
262 | }\r | |
263 | \r | |
264 | STATIC\r | |
265 | VOID\r | |
266 | CoreInsertEventTimer (\r | |
267 | IN IEVENT *Event\r | |
268 | )\r | |
269 | /*++\r | |
270 | \r | |
271 | Routine Description:\r | |
272 | \r | |
273 | Inserts the timer event\r | |
274 | \r | |
275 | Arguments:\r | |
276 | \r | |
277 | Event - Points to the internal structure of timer event to be installed\r | |
278 | \r | |
279 | Returns:\r | |
280 | \r | |
281 | None\r | |
282 | \r | |
283 | --*/\r | |
284 | {\r | |
285 | UINT64 TriggerTime;\r | |
286 | LIST_ENTRY *Link;\r | |
287 | IEVENT *Event2;\r | |
288 | \r | |
289 | ASSERT_LOCKED (&mEfiTimerLock);\r | |
290 | \r | |
291 | //\r | |
292 | // Get the timer's trigger time\r | |
293 | //\r | |
294 | \r | |
295 | TriggerTime = Event->u.Timer.TriggerTime;\r | |
296 | \r | |
297 | //\r | |
298 | // Insert the timer into the timer database in assending sorted order\r | |
299 | //\r | |
300 | \r | |
301 | for (Link = mEfiTimerList.ForwardLink; Link != &mEfiTimerList; Link = Link->ForwardLink) {\r | |
302 | Event2 = CR (Link, IEVENT, u.Timer.Link, EVENT_SIGNATURE);\r | |
303 | \r | |
304 | if (Event2->u.Timer.TriggerTime > TriggerTime) {\r | |
305 | break;\r | |
306 | }\r | |
307 | }\r | |
308 | \r | |
309 | InsertTailList (Link, &Event->u.Timer.Link);\r | |
310 | }\r | |
311 | \r | |
312 | \r | |
313 | \r | |
314 | EFI_STATUS\r | |
315 | EFIAPI\r | |
316 | CoreSetTimer (\r | |
317 | IN EFI_EVENT UserEvent,\r | |
318 | IN EFI_TIMER_DELAY Type,\r | |
319 | IN UINT64 TriggerTime\r | |
320 | )\r | |
321 | /*++\r | |
322 | \r | |
323 | Routine Description:\r | |
324 | \r | |
325 | Sets the type of timer and the trigger time for a timer event.\r | |
326 | \r | |
327 | Arguments:\r | |
328 | \r | |
329 | UserEvent - The timer event that is to be signaled at the specified time\r | |
330 | Type - The type of time that is specified in TriggerTime\r | |
331 | TriggerTime - The number of 100ns units until the timer expires\r | |
332 | \r | |
333 | Returns:\r | |
334 | \r | |
335 | EFI_SUCCESS - The event has been set to be signaled at the requested time\r | |
336 | EFI_INVALID_PARAMETER - Event or Type is not valid\r | |
337 | \r | |
338 | --*/ \r | |
339 | {\r | |
340 | IEVENT *Event;\r | |
341 | \r | |
342 | Event = UserEvent;\r | |
343 | \r | |
344 | if (Event == NULL) {\r | |
345 | return EFI_INVALID_PARAMETER;\r | |
346 | }\r | |
347 | \r | |
348 | if (Event->Signature != EVENT_SIGNATURE) {\r | |
349 | return EFI_INVALID_PARAMETER;\r | |
350 | }\r | |
351 | \r | |
352 | if (Type < 0 || Type > TimerRelative || !(Event->Type & EFI_EVENT_TIMER)) {\r | |
353 | return EFI_INVALID_PARAMETER;\r | |
354 | }\r | |
355 | \r | |
356 | CoreAcquireLock (&mEfiTimerLock);\r | |
357 | \r | |
358 | //\r | |
359 | // If the timer is queued to the timer database, remove it\r | |
360 | //\r | |
361 | \r | |
362 | if (Event->u.Timer.Link.ForwardLink != NULL) {\r | |
363 | RemoveEntryList (&Event->u.Timer.Link);\r | |
364 | Event->u.Timer.Link.ForwardLink = NULL;\r | |
365 | }\r | |
366 | \r | |
367 | Event->u.Timer.TriggerTime = 0;\r | |
368 | Event->u.Timer.Period = 0;\r | |
369 | \r | |
370 | if (Type != TimerCancel) {\r | |
371 | \r | |
372 | if (Type == TimerPeriodic) {\r | |
373 | Event->u.Timer.Period = TriggerTime;\r | |
374 | }\r | |
375 | \r | |
376 | Event->u.Timer.TriggerTime = CoreCurrentSystemTime () + TriggerTime;\r | |
377 | CoreInsertEventTimer (Event);\r | |
378 | \r | |
379 | if (TriggerTime == 0) {\r | |
380 | CoreSignalEvent (mEfiCheckTimerEvent);\r | |
381 | }\r | |
382 | }\r | |
383 | \r | |
384 | CoreReleaseLock (&mEfiTimerLock);\r | |
385 | return EFI_SUCCESS;\r | |
386 | }\r |