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23c98c94 | 1 | /** @file\r |
504214c4 LG |
2 | Core Timer Services\r |
3 | \r | |
23c98c94 | 4 | Copyright (c) 2006 - 2008, Intel Corporation. <BR>\r |
28a00297 | 5 | All rights reserved. This program and the accompanying materials\r |
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 |
28a00297 | 17 | \r |
28a00297 | 18 | //\r |
19 | // Internal data\r | |
20 | //\r | |
21 | \r | |
e94a9ff7 | 22 | LIST_ENTRY mEfiTimerList = INITIALIZE_LIST_HEAD_VARIABLE (mEfiTimerList);\r |
23 | EFI_LOCK mEfiTimerLock = EFI_INITIALIZE_LOCK_VARIABLE (TPL_HIGH_LEVEL - 1);\r | |
24 | EFI_EVENT mEfiCheckTimerEvent = NULL;\r | |
28a00297 | 25 | \r |
e94a9ff7 | 26 | EFI_LOCK mEfiSystemTimeLock = EFI_INITIALIZE_LOCK_VARIABLE (TPL_HIGH_LEVEL);\r |
27 | UINT64 mEfiSystemTime = 0;\r | |
28a00297 | 28 | \r |
29 | //\r | |
30 | // Timer functions\r | |
31 | //\r | |
162ed594 | 32 | /**\r |
f94b9be3 | 33 | Inserts the timer event.\r |
34 | \r | |
35 | @param Event Points to the internal structure of timer event\r | |
36 | to be installed\r | |
162ed594 | 37 | \r |
38 | **/\r | |
28a00297 | 39 | VOID\r |
f94b9be3 | 40 | CoreInsertEventTimer (\r |
41 | IN IEVENT *Event\r | |
28a00297 | 42 | )\r |
28a00297 | 43 | {\r |
f94b9be3 | 44 | UINT64 TriggerTime;\r |
45 | LIST_ENTRY *Link;\r | |
46 | IEVENT *Event2;\r | |
28a00297 | 47 | \r |
f94b9be3 | 48 | ASSERT_LOCKED (&mEfiTimerLock);\r |
49 | \r | |
50 | //\r | |
51 | // Get the timer's trigger time\r | |
52 | //\r | |
53 | TriggerTime = Event->u.Timer.TriggerTime;\r | |
54 | \r | |
55 | //\r | |
56 | // Insert the timer into the timer database in assending sorted order\r | |
57 | //\r | |
58 | for (Link = mEfiTimerList.ForwardLink; Link != &mEfiTimerList; Link = Link->ForwardLink) {\r | |
59 | Event2 = CR (Link, IEVENT, u.Timer.Link, EVENT_SIGNATURE);\r | |
28a00297 | 60 | \r |
f94b9be3 | 61 | if (Event2->u.Timer.TriggerTime > TriggerTime) {\r |
62 | break;\r | |
63 | }\r | |
64 | }\r | |
65 | \r | |
66 | InsertTailList (Link, &Event->u.Timer.Link);\r | |
67 | }\r | |
162ed594 | 68 | \r |
69 | /**\r | |
70 | Returns the current system time.\r | |
71 | \r | |
72 | @return The current system time\r | |
73 | \r | |
74 | **/\r | |
28a00297 | 75 | UINT64\r |
76 | CoreCurrentSystemTime (\r | |
77 | VOID\r | |
78 | )\r | |
28a00297 | 79 | {\r |
80 | UINT64 SystemTime;\r | |
81 | \r | |
82 | CoreAcquireLock (&mEfiSystemTimeLock);\r | |
83 | SystemTime = mEfiSystemTime;\r | |
84 | CoreReleaseLock (&mEfiSystemTimeLock);\r | |
022c6d45 | 85 | \r |
28a00297 | 86 | return SystemTime;\r |
87 | }\r | |
88 | \r | |
162ed594 | 89 | /**\r |
90 | Checks the sorted timer list against the current system time.\r | |
91 | Signals any expired event timer.\r | |
92 | \r | |
022c6d45 | 93 | @param CheckEvent Not used\r |
162ed594 | 94 | @param Context Not used\r |
95 | \r | |
96 | **/\r | |
28a00297 | 97 | VOID\r |
98 | EFIAPI\r | |
99 | CoreCheckTimers (\r | |
100 | IN EFI_EVENT CheckEvent,\r | |
101 | IN VOID *Context\r | |
102 | )\r | |
28a00297 | 103 | {\r |
104 | UINT64 SystemTime;\r | |
105 | IEVENT *Event;\r | |
106 | \r | |
107 | //\r | |
108 | // Check the timer database for expired timers\r | |
109 | //\r | |
28a00297 | 110 | CoreAcquireLock (&mEfiTimerLock);\r |
111 | SystemTime = CoreCurrentSystemTime ();\r | |
112 | \r | |
113 | while (!IsListEmpty (&mEfiTimerList)) {\r | |
114 | Event = CR (mEfiTimerList.ForwardLink, IEVENT, u.Timer.Link, EVENT_SIGNATURE);\r | |
115 | \r | |
116 | //\r | |
117 | // If this timer is not expired, then we're done\r | |
118 | //\r | |
28a00297 | 119 | if (Event->u.Timer.TriggerTime > SystemTime) {\r |
120 | break;\r | |
121 | }\r | |
122 | \r | |
123 | //\r | |
124 | // Remove this timer from the timer queue\r | |
125 | //\r | |
126 | \r | |
127 | RemoveEntryList (&Event->u.Timer.Link);\r | |
128 | Event->u.Timer.Link.ForwardLink = NULL;\r | |
129 | \r | |
130 | //\r | |
131 | // Signal it\r | |
132 | //\r | |
133 | CoreSignalEvent (Event);\r | |
134 | \r | |
135 | //\r | |
136 | // If this is a periodic timer, set it\r | |
137 | //\r | |
138 | if (Event->u.Timer.Period) {\r | |
28a00297 | 139 | //\r |
140 | // Compute the timers new trigger time\r | |
141 | //\r | |
28a00297 | 142 | Event->u.Timer.TriggerTime = Event->u.Timer.TriggerTime + Event->u.Timer.Period;\r |
143 | \r | |
144 | //\r | |
145 | // If that's before now, then reset the timer to start from now\r | |
146 | //\r | |
147 | if (Event->u.Timer.TriggerTime <= SystemTime) {\r | |
148 | Event->u.Timer.TriggerTime = SystemTime;\r | |
149 | CoreSignalEvent (mEfiCheckTimerEvent);\r | |
150 | }\r | |
151 | \r | |
152 | //\r | |
153 | // Add the timer\r | |
154 | //\r | |
28a00297 | 155 | CoreInsertEventTimer (Event);\r |
156 | }\r | |
157 | }\r | |
158 | \r | |
159 | CoreReleaseLock (&mEfiTimerLock);\r | |
160 | }\r | |
161 | \r | |
162ed594 | 162 | \r |
163 | /**\r | |
f94b9be3 | 164 | Initializes timer support.\r |
162ed594 | 165 | \r |
f94b9be3 | 166 | **/\r |
167 | VOID\r | |
168 | CoreInitializeTimer (\r | |
169 | VOID\r | |
170 | )\r | |
171 | {\r | |
172 | EFI_STATUS Status;\r | |
173 | \r | |
174 | Status = CoreCreateEvent (\r | |
175 | EVT_NOTIFY_SIGNAL,\r | |
176 | TPL_HIGH_LEVEL - 1,\r | |
177 | CoreCheckTimers,\r | |
178 | NULL,\r | |
179 | &mEfiCheckTimerEvent\r | |
180 | );\r | |
181 | ASSERT_EFI_ERROR (Status);\r | |
182 | }\r | |
183 | \r | |
184 | \r | |
185 | /**\r | |
186 | Called by the platform code to process a tick.\r | |
187 | \r | |
188 | @param Duration The number of 100ns elasped since the last call\r | |
189 | to TimerTick\r | |
162ed594 | 190 | \r |
191 | **/\r | |
28a00297 | 192 | VOID\r |
f94b9be3 | 193 | EFIAPI\r |
194 | CoreTimerTick (\r | |
195 | IN UINT64 Duration\r | |
28a00297 | 196 | )\r |
28a00297 | 197 | {\r |
f94b9be3 | 198 | IEVENT *Event;\r |
28a00297 | 199 | \r |
f94b9be3 | 200 | //\r |
201 | // Check runtiem flag in case there are ticks while exiting boot services\r | |
202 | //\r | |
203 | CoreAcquireLock (&mEfiSystemTimeLock);\r | |
28a00297 | 204 | \r |
205 | //\r | |
f94b9be3 | 206 | // Update the system time\r |
28a00297 | 207 | //\r |
f94b9be3 | 208 | mEfiSystemTime += Duration;\r |
28a00297 | 209 | \r |
210 | //\r | |
f94b9be3 | 211 | // If the head of the list is expired, fire the timer event\r |
212 | // to process it\r | |
28a00297 | 213 | //\r |
f94b9be3 | 214 | if (!IsListEmpty (&mEfiTimerList)) {\r |
215 | Event = CR (mEfiTimerList.ForwardLink, IEVENT, u.Timer.Link, EVENT_SIGNATURE);\r | |
28a00297 | 216 | \r |
f94b9be3 | 217 | if (Event->u.Timer.TriggerTime <= mEfiSystemTime) {\r |
218 | CoreSignalEvent (mEfiCheckTimerEvent);\r | |
28a00297 | 219 | }\r |
220 | }\r | |
221 | \r | |
f94b9be3 | 222 | CoreReleaseLock (&mEfiSystemTimeLock);\r |
28a00297 | 223 | }\r |
224 | \r | |
225 | \r | |
226 | \r | |
162ed594 | 227 | /**\r |
228 | Sets the type of timer and the trigger time for a timer event.\r | |
229 | \r | |
022c6d45 | 230 | @param UserEvent The timer event that is to be signaled at the\r |
231 | specified time\r | |
232 | @param Type The type of time that is specified in\r | |
233 | TriggerTime\r | |
234 | @param TriggerTime The number of 100ns units until the timer\r | |
235 | expires\r | |
162ed594 | 236 | \r |
022c6d45 | 237 | @retval EFI_SUCCESS The event has been set to be signaled at the\r |
238 | requested time\r | |
162ed594 | 239 | @retval EFI_INVALID_PARAMETER Event or Type is not valid\r |
240 | \r | |
241 | **/\r | |
28a00297 | 242 | EFI_STATUS\r |
243 | EFIAPI\r | |
244 | CoreSetTimer (\r | |
245 | IN EFI_EVENT UserEvent,\r | |
246 | IN EFI_TIMER_DELAY Type,\r | |
247 | IN UINT64 TriggerTime\r | |
248 | )\r | |
28a00297 | 249 | {\r |
250 | IEVENT *Event;\r | |
251 | \r | |
252 | Event = UserEvent;\r | |
253 | \r | |
254 | if (Event == NULL) {\r | |
255 | return EFI_INVALID_PARAMETER;\r | |
256 | }\r | |
257 | \r | |
258 | if (Event->Signature != EVENT_SIGNATURE) {\r | |
259 | return EFI_INVALID_PARAMETER;\r | |
260 | }\r | |
261 | \r | |
262 | if (Type < 0 || Type > TimerRelative || !(Event->Type & EVT_TIMER)) {\r | |
263 | return EFI_INVALID_PARAMETER;\r | |
264 | }\r | |
265 | \r | |
266 | CoreAcquireLock (&mEfiTimerLock);\r | |
267 | \r | |
268 | //\r | |
269 | // If the timer is queued to the timer database, remove it\r | |
270 | //\r | |
28a00297 | 271 | if (Event->u.Timer.Link.ForwardLink != NULL) {\r |
272 | RemoveEntryList (&Event->u.Timer.Link);\r | |
273 | Event->u.Timer.Link.ForwardLink = NULL;\r | |
274 | }\r | |
275 | \r | |
276 | Event->u.Timer.TriggerTime = 0;\r | |
277 | Event->u.Timer.Period = 0;\r | |
278 | \r | |
279 | if (Type != TimerCancel) {\r | |
280 | \r | |
281 | if (Type == TimerPeriodic) {\r | |
282 | Event->u.Timer.Period = TriggerTime;\r | |
283 | }\r | |
284 | \r | |
285 | Event->u.Timer.TriggerTime = CoreCurrentSystemTime () + TriggerTime;\r | |
286 | CoreInsertEventTimer (Event);\r | |
287 | \r | |
288 | if (TriggerTime == 0) {\r | |
289 | CoreSignalEvent (mEfiCheckTimerEvent);\r | |
290 | }\r | |
291 | }\r | |
292 | \r | |
293 | CoreReleaseLock (&mEfiTimerLock);\r | |
e94a9ff7 | 294 | \r |
28a00297 | 295 | return EFI_SUCCESS;\r |
296 | }\r |