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504214c4 | 1 | /** @file \r |
28a00297 | 2 | \r |
504214c4 LG |
3 | Core Timer Services\r |
4 | \r | |
5 | Copyright (c) 2006 - 2008, Intel Corporation\r | |
28a00297 | 6 | All rights reserved. This program and the accompanying materials\r |
7 | are licensed and made available under the terms and conditions of the BSD License\r | |
8 | which accompanies this distribution. The full text of the license may be found at\r | |
9 | http://opensource.org/licenses/bsd-license.php\r | |
10 | \r | |
11 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
12 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
13 | \r | |
504214c4 | 14 | **/\r |
28a00297 | 15 | \r |
16 | \r | |
17 | #include <DxeMain.h>\r | |
18 | \r | |
19 | //\r | |
20 | // Internal prototypes\r | |
21 | //\r | |
162ed594 | 22 | /**\r |
23 | Returns the current system time.\r | |
24 | \r | |
25 | @return The current system time\r | |
26 | \r | |
27 | **/\r | |
28a00297 | 28 | STATIC\r |
29 | UINT64\r | |
30 | CoreCurrentSystemTime (\r | |
31 | VOID\r | |
32 | );\r | |
33 | \r | |
162ed594 | 34 | /**\r |
35 | Checks the sorted timer list against the current system time.\r | |
36 | Signals any expired event timer.\r | |
37 | \r | |
38 | @param CheckEvent Not used \r | |
39 | @param Context Not used\r | |
40 | \r | |
41 | **/\r | |
28a00297 | 42 | STATIC\r |
43 | VOID\r | |
44 | EFIAPI\r | |
45 | CoreCheckTimers (\r | |
46 | IN EFI_EVENT Event,\r | |
47 | IN VOID *Context\r | |
48 | );\r | |
49 | \r | |
162ed594 | 50 | /**\r |
51 | Inserts the timer event.\r | |
52 | \r | |
53 | @param Event Points to the internal structure of timer event \r | |
54 | to be installed\r | |
55 | \r | |
56 | **/\r | |
28a00297 | 57 | STATIC\r |
58 | VOID\r | |
59 | CoreInsertEventTimer (\r | |
60 | IN IEVENT *Event\r | |
61 | );\r | |
62 | \r | |
63 | //\r | |
64 | // Internal data\r | |
65 | //\r | |
66 | \r | |
db405d1b | 67 | STATIC LIST_ENTRY mEfiTimerList = INITIALIZE_LIST_HEAD_VARIABLE (mEfiTimerList);\r |
68 | STATIC EFI_LOCK mEfiTimerLock = EFI_INITIALIZE_LOCK_VARIABLE (TPL_HIGH_LEVEL - 1);\r | |
69 | STATIC EFI_EVENT mEfiCheckTimerEvent;\r | |
28a00297 | 70 | \r |
db405d1b | 71 | STATIC EFI_LOCK mEfiSystemTimeLock = EFI_INITIALIZE_LOCK_VARIABLE (TPL_HIGH_LEVEL);\r |
72 | STATIC UINT64 mEfiSystemTime = 0;\r | |
28a00297 | 73 | \r |
74 | //\r | |
75 | // Timer functions\r | |
76 | //\r | |
77 | \r | |
162ed594 | 78 | \r |
79 | /**\r | |
80 | Initializes timer support.\r | |
81 | \r | |
82 | **/\r | |
28a00297 | 83 | VOID\r |
84 | CoreInitializeTimer (\r | |
85 | VOID\r | |
86 | )\r | |
28a00297 | 87 | {\r |
88 | EFI_STATUS Status;\r | |
89 | \r | |
90 | Status = CoreCreateEvent (\r | |
91 | EVT_NOTIFY_SIGNAL,\r | |
92 | TPL_HIGH_LEVEL - 1,\r | |
93 | CoreCheckTimers,\r | |
94 | NULL,\r | |
95 | &mEfiCheckTimerEvent\r | |
96 | );\r | |
97 | ASSERT_EFI_ERROR (Status);\r | |
98 | }\r | |
99 | \r | |
162ed594 | 100 | \r |
101 | /**\r | |
102 | Returns the current system time.\r | |
103 | \r | |
104 | @return The current system time\r | |
105 | \r | |
106 | **/\r | |
28a00297 | 107 | STATIC\r |
108 | UINT64\r | |
109 | CoreCurrentSystemTime (\r | |
110 | VOID\r | |
111 | )\r | |
28a00297 | 112 | {\r |
113 | UINT64 SystemTime;\r | |
114 | \r | |
115 | CoreAcquireLock (&mEfiSystemTimeLock);\r | |
116 | SystemTime = mEfiSystemTime;\r | |
117 | CoreReleaseLock (&mEfiSystemTimeLock);\r | |
118 | return SystemTime;\r | |
119 | }\r | |
120 | \r | |
162ed594 | 121 | \r |
122 | /**\r | |
123 | Called by the platform code to process a tick.\r | |
124 | \r | |
125 | @param Duration The number of 100ns elasped since the last call \r | |
126 | to TimerTick\r | |
127 | \r | |
128 | **/\r | |
28a00297 | 129 | VOID\r |
130 | EFIAPI\r | |
131 | CoreTimerTick (\r | |
132 | IN UINT64 Duration\r | |
133 | )\r | |
28a00297 | 134 | {\r |
135 | IEVENT *Event;\r | |
136 | \r | |
137 | //\r | |
138 | // Check runtiem flag in case there are ticks while exiting boot services\r | |
139 | //\r | |
140 | \r | |
141 | CoreAcquireLock (&mEfiSystemTimeLock);\r | |
142 | \r | |
143 | //\r | |
144 | // Update the system time\r | |
145 | //\r | |
146 | \r | |
147 | mEfiSystemTime += Duration;\r | |
148 | \r | |
149 | //\r | |
150 | // If the head of the list is expired, fire the timer event\r | |
151 | // to process it\r | |
152 | //\r | |
153 | \r | |
154 | if (!IsListEmpty (&mEfiTimerList)) {\r | |
155 | Event = CR (mEfiTimerList.ForwardLink, IEVENT, u.Timer.Link, EVENT_SIGNATURE);\r | |
156 | \r | |
157 | if (Event->u.Timer.TriggerTime <= mEfiSystemTime) {\r | |
158 | CoreSignalEvent (mEfiCheckTimerEvent);\r | |
159 | }\r | |
160 | }\r | |
161 | \r | |
162 | CoreReleaseLock (&mEfiSystemTimeLock);\r | |
163 | }\r | |
164 | \r | |
162ed594 | 165 | \r |
166 | /**\r | |
167 | Checks the sorted timer list against the current system time.\r | |
168 | Signals any expired event timer.\r | |
169 | \r | |
170 | @param CheckEvent Not used \r | |
171 | @param Context Not used\r | |
172 | \r | |
173 | **/\r | |
28a00297 | 174 | STATIC\r |
175 | VOID\r | |
176 | EFIAPI\r | |
177 | CoreCheckTimers (\r | |
178 | IN EFI_EVENT CheckEvent,\r | |
179 | IN VOID *Context\r | |
180 | )\r | |
28a00297 | 181 | {\r |
182 | UINT64 SystemTime;\r | |
183 | IEVENT *Event;\r | |
184 | \r | |
185 | //\r | |
186 | // Check the timer database for expired timers\r | |
187 | //\r | |
188 | \r | |
189 | CoreAcquireLock (&mEfiTimerLock);\r | |
190 | SystemTime = CoreCurrentSystemTime ();\r | |
191 | \r | |
192 | while (!IsListEmpty (&mEfiTimerList)) {\r | |
193 | Event = CR (mEfiTimerList.ForwardLink, IEVENT, u.Timer.Link, EVENT_SIGNATURE);\r | |
194 | \r | |
195 | //\r | |
196 | // If this timer is not expired, then we're done\r | |
197 | //\r | |
198 | \r | |
199 | if (Event->u.Timer.TriggerTime > SystemTime) {\r | |
200 | break;\r | |
201 | }\r | |
202 | \r | |
203 | //\r | |
204 | // Remove this timer from the timer queue\r | |
205 | //\r | |
206 | \r | |
207 | RemoveEntryList (&Event->u.Timer.Link);\r | |
208 | Event->u.Timer.Link.ForwardLink = NULL;\r | |
209 | \r | |
210 | //\r | |
211 | // Signal it\r | |
212 | //\r | |
213 | CoreSignalEvent (Event);\r | |
214 | \r | |
215 | //\r | |
216 | // If this is a periodic timer, set it\r | |
217 | //\r | |
218 | if (Event->u.Timer.Period) {\r | |
219 | \r | |
220 | //\r | |
221 | // Compute the timers new trigger time\r | |
222 | //\r | |
223 | \r | |
224 | Event->u.Timer.TriggerTime = Event->u.Timer.TriggerTime + Event->u.Timer.Period;\r | |
225 | \r | |
226 | //\r | |
227 | // If that's before now, then reset the timer to start from now\r | |
228 | //\r | |
229 | if (Event->u.Timer.TriggerTime <= SystemTime) {\r | |
230 | Event->u.Timer.TriggerTime = SystemTime;\r | |
231 | CoreSignalEvent (mEfiCheckTimerEvent);\r | |
232 | }\r | |
233 | \r | |
234 | //\r | |
235 | // Add the timer\r | |
236 | //\r | |
237 | \r | |
238 | CoreInsertEventTimer (Event);\r | |
239 | }\r | |
240 | }\r | |
241 | \r | |
242 | CoreReleaseLock (&mEfiTimerLock);\r | |
243 | }\r | |
244 | \r | |
162ed594 | 245 | \r |
246 | /**\r | |
247 | Inserts the timer event.\r | |
248 | \r | |
249 | @param Event Points to the internal structure of timer event \r | |
250 | to be installed\r | |
251 | \r | |
252 | **/\r | |
28a00297 | 253 | STATIC\r |
254 | VOID\r | |
255 | CoreInsertEventTimer (\r | |
256 | IN IEVENT *Event\r | |
257 | )\r | |
28a00297 | 258 | {\r |
259 | UINT64 TriggerTime;\r | |
260 | LIST_ENTRY *Link;\r | |
261 | IEVENT *Event2;\r | |
262 | \r | |
263 | ASSERT_LOCKED (&mEfiTimerLock);\r | |
264 | \r | |
265 | //\r | |
266 | // Get the timer's trigger time\r | |
267 | //\r | |
268 | \r | |
269 | TriggerTime = Event->u.Timer.TriggerTime;\r | |
270 | \r | |
271 | //\r | |
272 | // Insert the timer into the timer database in assending sorted order\r | |
273 | //\r | |
274 | \r | |
275 | for (Link = mEfiTimerList.ForwardLink; Link != &mEfiTimerList; Link = Link->ForwardLink) {\r | |
276 | Event2 = CR (Link, IEVENT, u.Timer.Link, EVENT_SIGNATURE);\r | |
277 | \r | |
278 | if (Event2->u.Timer.TriggerTime > TriggerTime) {\r | |
279 | break;\r | |
280 | }\r | |
281 | }\r | |
282 | \r | |
283 | InsertTailList (Link, &Event->u.Timer.Link);\r | |
284 | }\r | |
285 | \r | |
286 | \r | |
287 | \r | |
162ed594 | 288 | \r |
289 | /**\r | |
290 | Sets the type of timer and the trigger time for a timer event.\r | |
291 | \r | |
292 | @param UserEvent The timer event that is to be signaled at the \r | |
293 | specified time \r | |
294 | @param Type The type of time that is specified in \r | |
295 | TriggerTime \r | |
296 | @param TriggerTime The number of 100ns units until the timer \r | |
297 | expires \r | |
298 | \r | |
299 | @retval EFI_SUCCESS The event has been set to be signaled at the \r | |
300 | requested time \r | |
301 | @retval EFI_INVALID_PARAMETER Event or Type is not valid\r | |
302 | \r | |
303 | **/\r | |
28a00297 | 304 | EFI_STATUS\r |
305 | EFIAPI\r | |
306 | CoreSetTimer (\r | |
307 | IN EFI_EVENT UserEvent,\r | |
308 | IN EFI_TIMER_DELAY Type,\r | |
309 | IN UINT64 TriggerTime\r | |
310 | )\r | |
28a00297 | 311 | {\r |
312 | IEVENT *Event;\r | |
313 | \r | |
314 | Event = UserEvent;\r | |
315 | \r | |
316 | if (Event == NULL) {\r | |
317 | return EFI_INVALID_PARAMETER;\r | |
318 | }\r | |
319 | \r | |
320 | if (Event->Signature != EVENT_SIGNATURE) {\r | |
321 | return EFI_INVALID_PARAMETER;\r | |
322 | }\r | |
323 | \r | |
324 | if (Type < 0 || Type > TimerRelative || !(Event->Type & EVT_TIMER)) {\r | |
325 | return EFI_INVALID_PARAMETER;\r | |
326 | }\r | |
327 | \r | |
328 | CoreAcquireLock (&mEfiTimerLock);\r | |
329 | \r | |
330 | //\r | |
331 | // If the timer is queued to the timer database, remove it\r | |
332 | //\r | |
333 | \r | |
334 | if (Event->u.Timer.Link.ForwardLink != NULL) {\r | |
335 | RemoveEntryList (&Event->u.Timer.Link);\r | |
336 | Event->u.Timer.Link.ForwardLink = NULL;\r | |
337 | }\r | |
338 | \r | |
339 | Event->u.Timer.TriggerTime = 0;\r | |
340 | Event->u.Timer.Period = 0;\r | |
341 | \r | |
342 | if (Type != TimerCancel) {\r | |
343 | \r | |
344 | if (Type == TimerPeriodic) {\r | |
345 | Event->u.Timer.Period = TriggerTime;\r | |
346 | }\r | |
347 | \r | |
348 | Event->u.Timer.TriggerTime = CoreCurrentSystemTime () + TriggerTime;\r | |
349 | CoreInsertEventTimer (Event);\r | |
350 | \r | |
351 | if (TriggerTime == 0) {\r | |
352 | CoreSignalEvent (mEfiCheckTimerEvent);\r | |
353 | }\r | |
354 | }\r | |
355 | \r | |
356 | CoreReleaseLock (&mEfiTimerLock);\r | |
357 | return EFI_SUCCESS;\r | |
358 | }\r |