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23c98c94 | 1 | /** @file\r |
504214c4 LG |
2 | Core Timer Services\r |
3 | \r | |
d1edec0a | 4 | Copyright (c) 2006 - 2013, 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 |
28a00297 | 19 | //\r |
20 | // Internal data\r | |
21 | //\r | |
22 | \r | |
e94a9ff7 | 23 | LIST_ENTRY mEfiTimerList = INITIALIZE_LIST_HEAD_VARIABLE (mEfiTimerList);\r |
24 | EFI_LOCK mEfiTimerLock = EFI_INITIALIZE_LOCK_VARIABLE (TPL_HIGH_LEVEL - 1);\r | |
25 | EFI_EVENT mEfiCheckTimerEvent = NULL;\r | |
28a00297 | 26 | \r |
e94a9ff7 | 27 | EFI_LOCK mEfiSystemTimeLock = EFI_INITIALIZE_LOCK_VARIABLE (TPL_HIGH_LEVEL);\r |
28 | UINT64 mEfiSystemTime = 0;\r | |
28a00297 | 29 | \r |
30 | //\r | |
31 | // Timer functions\r | |
32 | //\r | |
162ed594 | 33 | /**\r |
f94b9be3 | 34 | Inserts the timer event.\r |
35 | \r | |
36 | @param Event Points to the internal structure of timer event\r | |
37 | to be installed\r | |
162ed594 | 38 | \r |
39 | **/\r | |
28a00297 | 40 | VOID\r |
f94b9be3 | 41 | CoreInsertEventTimer (\r |
42 | IN IEVENT *Event\r | |
28a00297 | 43 | )\r |
28a00297 | 44 | {\r |
f94b9be3 | 45 | UINT64 TriggerTime;\r |
46 | LIST_ENTRY *Link;\r | |
47 | IEVENT *Event2;\r | |
28a00297 | 48 | \r |
f94b9be3 | 49 | ASSERT_LOCKED (&mEfiTimerLock);\r |
50 | \r | |
51 | //\r | |
52 | // Get the timer's trigger time\r | |
53 | //\r | |
1ccdbf2a | 54 | TriggerTime = Event->Timer.TriggerTime;\r |
f94b9be3 | 55 | \r |
56 | //\r | |
57 | // Insert the timer into the timer database in assending sorted order\r | |
58 | //\r | |
59 | for (Link = mEfiTimerList.ForwardLink; Link != &mEfiTimerList; Link = Link->ForwardLink) {\r | |
1ccdbf2a | 60 | Event2 = CR (Link, IEVENT, Timer.Link, EVENT_SIGNATURE);\r |
28a00297 | 61 | \r |
1ccdbf2a | 62 | if (Event2->Timer.TriggerTime > TriggerTime) {\r |
f94b9be3 | 63 | break;\r |
64 | }\r | |
65 | }\r | |
66 | \r | |
1ccdbf2a | 67 | InsertTailList (Link, &Event->Timer.Link);\r |
f94b9be3 | 68 | }\r |
162ed594 | 69 | \r |
70 | /**\r | |
71 | Returns the current system time.\r | |
72 | \r | |
73 | @return The current system time\r | |
74 | \r | |
75 | **/\r | |
28a00297 | 76 | UINT64\r |
77 | CoreCurrentSystemTime (\r | |
78 | VOID\r | |
79 | )\r | |
28a00297 | 80 | {\r |
81 | UINT64 SystemTime;\r | |
82 | \r | |
83 | CoreAcquireLock (&mEfiSystemTimeLock);\r | |
84 | SystemTime = mEfiSystemTime;\r | |
85 | CoreReleaseLock (&mEfiSystemTimeLock);\r | |
022c6d45 | 86 | \r |
28a00297 | 87 | return SystemTime;\r |
88 | }\r | |
89 | \r | |
162ed594 | 90 | /**\r |
91 | Checks the sorted timer list against the current system time.\r | |
92 | Signals any expired event timer.\r | |
93 | \r | |
022c6d45 | 94 | @param CheckEvent Not used\r |
162ed594 | 95 | @param Context Not used\r |
96 | \r | |
97 | **/\r | |
28a00297 | 98 | VOID\r |
99 | EFIAPI\r | |
100 | CoreCheckTimers (\r | |
101 | IN EFI_EVENT CheckEvent,\r | |
102 | IN VOID *Context\r | |
103 | )\r | |
28a00297 | 104 | {\r |
105 | UINT64 SystemTime;\r | |
106 | IEVENT *Event;\r | |
107 | \r | |
108 | //\r | |
109 | // Check the timer database for expired timers\r | |
110 | //\r | |
28a00297 | 111 | CoreAcquireLock (&mEfiTimerLock);\r |
112 | SystemTime = CoreCurrentSystemTime ();\r | |
113 | \r | |
114 | while (!IsListEmpty (&mEfiTimerList)) {\r | |
1ccdbf2a | 115 | Event = CR (mEfiTimerList.ForwardLink, IEVENT, Timer.Link, EVENT_SIGNATURE);\r |
28a00297 | 116 | \r |
117 | //\r | |
118 | // If this timer is not expired, then we're done\r | |
119 | //\r | |
1ccdbf2a | 120 | if (Event->Timer.TriggerTime > SystemTime) {\r |
28a00297 | 121 | break;\r |
122 | }\r | |
123 | \r | |
124 | //\r | |
125 | // Remove this timer from the timer queue\r | |
126 | //\r | |
127 | \r | |
1ccdbf2a | 128 | RemoveEntryList (&Event->Timer.Link);\r |
129 | Event->Timer.Link.ForwardLink = NULL;\r | |
28a00297 | 130 | \r |
131 | //\r | |
132 | // Signal it\r | |
133 | //\r | |
134 | CoreSignalEvent (Event);\r | |
135 | \r | |
136 | //\r | |
137 | // If this is a periodic timer, set it\r | |
138 | //\r | |
1ccdbf2a | 139 | if (Event->Timer.Period != 0) {\r |
28a00297 | 140 | //\r |
141 | // Compute the timers new trigger time\r | |
142 | //\r | |
1ccdbf2a | 143 | Event->Timer.TriggerTime = Event->Timer.TriggerTime + Event->Timer.Period;\r |
28a00297 | 144 | \r |
145 | //\r | |
146 | // If that's before now, then reset the timer to start from now\r | |
147 | //\r | |
1ccdbf2a | 148 | if (Event->Timer.TriggerTime <= SystemTime) {\r |
149 | Event->Timer.TriggerTime = SystemTime;\r | |
28a00297 | 150 | CoreSignalEvent (mEfiCheckTimerEvent);\r |
151 | }\r | |
152 | \r | |
153 | //\r | |
154 | // Add the timer\r | |
155 | //\r | |
28a00297 | 156 | CoreInsertEventTimer (Event);\r |
157 | }\r | |
158 | }\r | |
159 | \r | |
160 | CoreReleaseLock (&mEfiTimerLock);\r | |
161 | }\r | |
162 | \r | |
162ed594 | 163 | \r |
164 | /**\r | |
f94b9be3 | 165 | Initializes timer support.\r |
162ed594 | 166 | \r |
f94b9be3 | 167 | **/\r |
168 | VOID\r | |
169 | CoreInitializeTimer (\r | |
170 | VOID\r | |
171 | )\r | |
172 | {\r | |
173 | EFI_STATUS Status;\r | |
174 | \r | |
670d4d88 | 175 | Status = CoreCreateEventInternal (\r |
f94b9be3 | 176 | EVT_NOTIFY_SIGNAL,\r |
177 | TPL_HIGH_LEVEL - 1,\r | |
178 | CoreCheckTimers,\r | |
179 | NULL,\r | |
670d4d88 | 180 | NULL,\r |
f94b9be3 | 181 | &mEfiCheckTimerEvent\r |
182 | );\r | |
183 | ASSERT_EFI_ERROR (Status);\r | |
184 | }\r | |
185 | \r | |
186 | \r | |
187 | /**\r | |
188 | Called by the platform code to process a tick.\r | |
189 | \r | |
6393d9c8 | 190 | @param Duration The number of 100ns elapsed since the last call\r |
f94b9be3 | 191 | to TimerTick\r |
162ed594 | 192 | \r |
193 | **/\r | |
28a00297 | 194 | VOID\r |
f94b9be3 | 195 | EFIAPI\r |
196 | CoreTimerTick (\r | |
197 | IN UINT64 Duration\r | |
28a00297 | 198 | )\r |
28a00297 | 199 | {\r |
f94b9be3 | 200 | IEVENT *Event;\r |
28a00297 | 201 | \r |
f94b9be3 | 202 | //\r |
203 | // Check runtiem flag in case there are ticks while exiting boot services\r | |
204 | //\r | |
205 | CoreAcquireLock (&mEfiSystemTimeLock);\r | |
28a00297 | 206 | \r |
207 | //\r | |
f94b9be3 | 208 | // Update the system time\r |
28a00297 | 209 | //\r |
f94b9be3 | 210 | mEfiSystemTime += Duration;\r |
28a00297 | 211 | \r |
212 | //\r | |
f94b9be3 | 213 | // If the head of the list is expired, fire the timer event\r |
214 | // to process it\r | |
28a00297 | 215 | //\r |
f94b9be3 | 216 | if (!IsListEmpty (&mEfiTimerList)) {\r |
1ccdbf2a | 217 | Event = CR (mEfiTimerList.ForwardLink, IEVENT, Timer.Link, EVENT_SIGNATURE);\r |
28a00297 | 218 | \r |
1ccdbf2a | 219 | if (Event->Timer.TriggerTime <= mEfiSystemTime) {\r |
f94b9be3 | 220 | CoreSignalEvent (mEfiCheckTimerEvent);\r |
28a00297 | 221 | }\r |
222 | }\r | |
223 | \r | |
f94b9be3 | 224 | CoreReleaseLock (&mEfiSystemTimeLock);\r |
28a00297 | 225 | }\r |
226 | \r | |
227 | \r | |
228 | \r | |
162ed594 | 229 | /**\r |
230 | Sets the type of timer and the trigger time for a timer event.\r | |
231 | \r | |
022c6d45 | 232 | @param UserEvent The timer event that is to be signaled at the\r |
233 | specified time\r | |
234 | @param Type The type of time that is specified in\r | |
235 | TriggerTime\r | |
236 | @param TriggerTime The number of 100ns units until the timer\r | |
237 | expires\r | |
162ed594 | 238 | \r |
022c6d45 | 239 | @retval EFI_SUCCESS The event has been set to be signaled at the\r |
240 | requested time\r | |
162ed594 | 241 | @retval EFI_INVALID_PARAMETER Event or Type is not valid\r |
242 | \r | |
243 | **/\r | |
28a00297 | 244 | EFI_STATUS\r |
245 | EFIAPI\r | |
246 | CoreSetTimer (\r | |
247 | IN EFI_EVENT UserEvent,\r | |
248 | IN EFI_TIMER_DELAY Type,\r | |
249 | IN UINT64 TriggerTime\r | |
250 | )\r | |
28a00297 | 251 | {\r |
252 | IEVENT *Event;\r | |
253 | \r | |
254 | Event = UserEvent;\r | |
255 | \r | |
256 | if (Event == NULL) {\r | |
257 | return EFI_INVALID_PARAMETER;\r | |
258 | }\r | |
259 | \r | |
260 | if (Event->Signature != EVENT_SIGNATURE) {\r | |
261 | return EFI_INVALID_PARAMETER;\r | |
262 | }\r | |
263 | \r | |
3d78c020 | 264 | if ((UINT32)Type > TimerRelative || (Event->Type & EVT_TIMER) == 0) {\r |
28a00297 | 265 | return EFI_INVALID_PARAMETER;\r |
266 | }\r | |
267 | \r | |
268 | CoreAcquireLock (&mEfiTimerLock);\r | |
269 | \r | |
270 | //\r | |
271 | // If the timer is queued to the timer database, remove it\r | |
272 | //\r | |
1ccdbf2a | 273 | if (Event->Timer.Link.ForwardLink != NULL) {\r |
274 | RemoveEntryList (&Event->Timer.Link);\r | |
275 | Event->Timer.Link.ForwardLink = NULL;\r | |
28a00297 | 276 | }\r |
277 | \r | |
1ccdbf2a | 278 | Event->Timer.TriggerTime = 0;\r |
279 | Event->Timer.Period = 0;\r | |
28a00297 | 280 | \r |
281 | if (Type != TimerCancel) {\r | |
282 | \r | |
283 | if (Type == TimerPeriodic) {\r | |
d1edec0a EL |
284 | if (TriggerTime == 0) {\r |
285 | gTimer->GetTimerPeriod (gTimer, &TriggerTime);\r | |
286 | }\r | |
1ccdbf2a | 287 | Event->Timer.Period = TriggerTime;\r |
28a00297 | 288 | }\r |
289 | \r | |
1ccdbf2a | 290 | Event->Timer.TriggerTime = CoreCurrentSystemTime () + TriggerTime;\r |
28a00297 | 291 | CoreInsertEventTimer (Event);\r |
292 | \r | |
293 | if (TriggerTime == 0) {\r | |
294 | CoreSignalEvent (mEfiCheckTimerEvent);\r | |
295 | }\r | |
296 | }\r | |
297 | \r | |
298 | CoreReleaseLock (&mEfiTimerLock);\r | |
e94a9ff7 | 299 | \r |
28a00297 | 300 | return EFI_SUCCESS;\r |
301 | }\r |