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878ddf1f | 1 | /** @file\r |
2 | Implementation of synchronization functions.\r | |
3 | \r | |
ef7baf58 | 4 | Copyright (c) 2006 - 2007, Intel Corporation<BR>\r |
878ddf1f | 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 | |
ef7baf58 | 13 | Module Name: SynchronizationMsc.c\r |
878ddf1f | 14 | \r |
15 | **/\r | |
16 | \r | |
58251024 | 17 | #include "BaseLibInternals.h"\r |
18 | \r | |
eb9603a0 | 19 | //\r |
ef7baf58 | 20 | // Microsoft Visual Studio 7.1 Function Prototypes for read write barrier Intrinsics\r |
eb9603a0 | 21 | //\r |
ef7baf58 | 22 | void _ReadWriteBarrier (void);\r |
23 | #pragma intrinsic(_ReadWriteBarrier)\r | |
24 | \r | |
25 | \r | |
46dd23b8 | 26 | #define SPIN_LOCK_RELEASED ((UINTN) 1)\r |
27 | #define SPIN_LOCK_ACQUIRED ((UINTN) 2)\r | |
878ddf1f | 28 | \r |
878ddf1f | 29 | /**\r |
30 | Retrieves the architecture specific spin lock alignment requirements for\r | |
31 | optimal spin lock performance.\r | |
32 | \r | |
33 | This function retrieves the spin lock alignment requirements for optimal\r | |
34 | performance on a given CPU architecture. The spin lock alignment must be a\r | |
35 | power of two and is returned by this function. If there are no alignment\r | |
36 | requirements, then 1 must be returned. The spin lock synchronization\r | |
37 | functions must function correctly if the spin lock size and alignment values\r | |
38 | returned by this function are not used at all. These values are hints to the\r | |
39 | consumers of the spin lock synchronization functions to obtain optimal spin\r | |
40 | lock performance.\r | |
41 | \r | |
42 | @return The architecture specific spin lock alignment.\r | |
43 | \r | |
44 | **/\r | |
45 | UINTN\r | |
46 | EFIAPI\r | |
47 | GetSpinLockProperties (\r | |
48 | VOID\r | |
49 | )\r | |
50 | {\r | |
51 | // @bug May use a PCD entry to determine this alignment.\r | |
52 | return 32;\r | |
53 | }\r | |
54 | \r | |
55 | /**\r | |
56 | Initializes a spin lock to the released state and returns the spin lock.\r | |
57 | \r | |
58 | This function initializes the spin lock specified by SpinLock to the released\r | |
59 | state, and returns SpinLock. Optimal performance can be achieved by calling\r | |
60 | GetSpinLockProperties() to determine the size and alignment requirements for\r | |
61 | SpinLock.\r | |
62 | \r | |
63 | If SpinLock is NULL, then ASSERT().\r | |
64 | \r | |
65 | @param SpinLock A pointer to the spin lock to initialize to the released\r | |
66 | state.\r | |
67 | \r | |
68 | @return SpinLock\r | |
69 | \r | |
70 | **/\r | |
71 | SPIN_LOCK *\r | |
72 | EFIAPI\r | |
73 | InitializeSpinLock (\r | |
74 | OUT SPIN_LOCK *SpinLock\r | |
75 | )\r | |
76 | {\r | |
77 | ASSERT (SpinLock != NULL);\r | |
ef7baf58 | 78 | \r |
79 | _ReadWriteBarrier();\r | |
27787243 | 80 | *SpinLock = SPIN_LOCK_RELEASED;\r |
ef7baf58 | 81 | _ReadWriteBarrier();\r |
82 | \r | |
878ddf1f | 83 | return SpinLock;\r |
84 | }\r | |
85 | \r | |
86 | /**\r | |
87 | Waits until a spin lock can be placed in the acquired state.\r | |
88 | \r | |
89 | This function checks the state of the spin lock specified by SpinLock. If\r | |
90 | SpinLock is in the released state, then this function places SpinLock in the\r | |
91 | acquired state and returns SpinLock. Otherwise, this function waits\r | |
92 | indefinitely for the spin lock to be released, and then places it in the\r | |
93 | acquired state and returns SpinLock. All state transitions of SpinLock must\r | |
94 | be performed using MP safe mechanisms.\r | |
95 | \r | |
96 | If SpinLock is NULL, then ASSERT().\r | |
97 | If SpinLock was not initialized with InitializeSpinLock(), then ASSERT().\r | |
98 | If PcdSpinLockTimeout is not zero, and SpinLock is can not be acquired in\r | |
99 | PcdSpinLockTimeout microseconds, then ASSERT().\r | |
100 | \r | |
101 | @param SpinLock A pointer to the spin lock to place in the acquired state.\r | |
102 | \r | |
103 | @return SpinLock\r | |
104 | \r | |
105 | **/\r | |
106 | SPIN_LOCK *\r | |
107 | EFIAPI\r | |
108 | AcquireSpinLock (\r | |
109 | IN OUT SPIN_LOCK *SpinLock\r | |
110 | )\r | |
111 | {\r | |
112 | UINT64 Tick;\r | |
113 | UINT64 Start, End;\r | |
114 | UINT64 Timeout;\r | |
115 | \r | |
116 | Tick = 0;\r | |
117 | Start = 0;\r | |
118 | End = 0;\r | |
dc530c7b | 119 | if (PcdGet32 (PcdSpinLockTimeout) > 0) {\r |
878ddf1f | 120 | Tick = GetPerformanceCounter ();\r |
121 | Timeout = DivU64x32 (\r | |
122 | MultU64x32 (\r | |
123 | GetPerformanceCounterProperties (&Start, &End),\r | |
dc530c7b | 124 | PcdGet32 (PcdSpinLockTimeout)\r |
878ddf1f | 125 | ),\r |
126 | 1000000\r | |
127 | );\r | |
128 | if (Start < End) {\r | |
129 | Tick += Timeout;\r | |
130 | } else {\r | |
131 | Tick -= Timeout;\r | |
132 | }\r | |
133 | }\r | |
134 | \r | |
135 | while (!AcquireSpinLockOrFail (SpinLock)) {\r | |
136 | CpuPause ();\r | |
137 | ASSERT ((Start < End) ^ (Tick <= GetPerformanceCounter ()));\r | |
138 | }\r | |
139 | return SpinLock;\r | |
140 | }\r | |
141 | \r | |
142 | /**\r | |
143 | Attempts to place a spin lock in the acquired state.\r | |
144 | \r | |
145 | This function checks the state of the spin lock specified by SpinLock. If\r | |
146 | SpinLock is in the released state, then this function places SpinLock in the\r | |
147 | acquired state and returns TRUE. Otherwise, FALSE is returned. All state\r | |
148 | transitions of SpinLock must be performed using MP safe mechanisms.\r | |
149 | \r | |
150 | If SpinLock is NULL, then ASSERT().\r | |
151 | If SpinLock was not initialized with InitializeSpinLock(), then ASSERT().\r | |
152 | \r | |
153 | @param SpinLock A pointer to the spin lock to place in the acquired state.\r | |
154 | \r | |
155 | @retval TRUE SpinLock was placed in the acquired state.\r | |
156 | @retval FALSE SpinLock could not be acquired.\r | |
157 | \r | |
158 | **/\r | |
159 | BOOLEAN\r | |
160 | EFIAPI\r | |
161 | AcquireSpinLockOrFail (\r | |
162 | IN OUT SPIN_LOCK *SpinLock\r | |
163 | )\r | |
164 | {\r | |
ef7baf58 | 165 | VOID *Result;\r |
166 | \r | |
878ddf1f | 167 | ASSERT (SpinLock != NULL);\r |
ef7baf58 | 168 | ASSERT (*SpinLock == SPIN_LOCK_ACQUIRED || *SpinLock == SPIN_LOCK_RELEASED);\r |
c9708ddd | 169 | \r |
ef7baf58 | 170 | _ReadWriteBarrier ();\r |
171 | Result = InterlockedCompareExchangePointer (\r | |
878ddf1f | 172 | (VOID**)SpinLock,\r |
173 | (VOID*)SPIN_LOCK_RELEASED,\r | |
174 | (VOID*)SPIN_LOCK_ACQUIRED\r | |
878ddf1f | 175 | );\r |
ef7baf58 | 176 | \r |
177 | _ReadWriteBarrier ();\r | |
178 | return (BOOLEAN) (Result == (VOID*) SPIN_LOCK_RELEASED);\r | |
878ddf1f | 179 | }\r |
180 | \r | |
181 | /**\r | |
182 | Releases a spin lock.\r | |
183 | \r | |
184 | This function places the spin lock specified by SpinLock in the release state\r | |
185 | and returns SpinLock.\r | |
186 | \r | |
187 | If SpinLock is NULL, then ASSERT().\r | |
188 | If SpinLock was not initialized with InitializeSpinLock(), then ASSERT().\r | |
189 | \r | |
190 | @param SpinLock A pointer to the spin lock to release.\r | |
191 | \r | |
192 | @return SpinLock\r | |
193 | \r | |
194 | **/\r | |
195 | SPIN_LOCK *\r | |
196 | EFIAPI\r | |
197 | ReleaseSpinLock (\r | |
198 | IN OUT SPIN_LOCK *SpinLock\r | |
199 | )\r | |
200 | {\r | |
201 | ASSERT (SpinLock != NULL);\r | |
ef7baf58 | 202 | ASSERT (*SpinLock == SPIN_LOCK_ACQUIRED || *SpinLock == SPIN_LOCK_RELEASED);\r |
c9708ddd | 203 | \r |
ef7baf58 | 204 | _ReadWriteBarrier ();\r |
27787243 | 205 | *SpinLock = SPIN_LOCK_RELEASED;\r |
ef7baf58 | 206 | _ReadWriteBarrier ();\r |
207 | \r | |
878ddf1f | 208 | return SpinLock;\r |
209 | }\r | |
210 | \r | |
211 | /**\r | |
212 | Performs an atomic increment of an 32-bit unsigned integer.\r | |
213 | \r | |
214 | Performs an atomic increment of the 32-bit unsigned integer specified by\r | |
215 | Value and returns the incremented value. The increment operation must be\r | |
216 | performed using MP safe mechanisms. The state of the return value is not\r | |
217 | guaranteed to be MP safe.\r | |
218 | \r | |
219 | If Value is NULL, then ASSERT().\r | |
220 | \r | |
221 | @param Value A pointer to the 32-bit value to increment.\r | |
222 | \r | |
223 | @return The incremented value.\r | |
224 | \r | |
225 | **/\r | |
226 | UINT32\r | |
227 | EFIAPI\r | |
228 | InterlockedIncrement (\r | |
229 | IN UINT32 *Value\r | |
230 | )\r | |
231 | {\r | |
232 | ASSERT (Value != NULL);\r | |
233 | return InternalSyncIncrement (Value);\r | |
234 | }\r | |
235 | \r | |
236 | /**\r | |
237 | Performs an atomic decrement of an 32-bit unsigned integer.\r | |
238 | \r | |
239 | Performs an atomic decrement of the 32-bit unsigned integer specified by\r | |
240 | Value and returns the decremented value. The decrement operation must be\r | |
241 | performed using MP safe mechanisms. The state of the return value is not\r | |
242 | guaranteed to be MP safe.\r | |
243 | \r | |
244 | If Value is NULL, then ASSERT().\r | |
245 | \r | |
246 | @param Value A pointer to the 32-bit value to decrement.\r | |
247 | \r | |
248 | @return The decremented value.\r | |
249 | \r | |
250 | **/\r | |
251 | UINT32\r | |
252 | EFIAPI\r | |
253 | InterlockedDecrement (\r | |
254 | IN UINT32 *Value\r | |
255 | )\r | |
256 | {\r | |
257 | ASSERT (Value != NULL);\r | |
258 | return InternalSyncDecrement (Value);\r | |
259 | }\r | |
260 | \r | |
261 | /**\r | |
262 | Performs an atomic compare exchange operation on a 32-bit unsigned integer.\r | |
263 | \r | |
1ea5ca46 | 264 | Performs an atomic compare exchange operation on the 32-bit unsigned integer\r |
265 | specified by Value. If Value is equal to CompareValue, then Value is set to \r | |
266 | ExchangeValue and CompareValue is returned. If Value is not equal to CompareValue,\r | |
267 | then Value is returned. The compare exchange operation must be performed using \r | |
268 | MP safe mechanisms.\r | |
269 | \r | |
270 | If Value is NULL, then ASSERT().\r | |
271 | \r | |
878ddf1f | 272 | @param Value A pointer to the 32-bit value for the compare exchange\r |
273 | operation.\r | |
274 | @param CompareValue 32-bit value used in compare operation.\r | |
275 | @param ExchangeValue 32-bit value used in exchange operation.\r | |
276 | \r | |
277 | @return The original *Value before exchange.\r | |
278 | \r | |
279 | **/\r | |
280 | UINT32\r | |
281 | EFIAPI\r | |
282 | InterlockedCompareExchange32 (\r | |
0ffa1286 | 283 | IN OUT UINT32 *Value,\r |
878ddf1f | 284 | IN UINT32 CompareValue,\r |
285 | IN UINT32 ExchangeValue\r | |
286 | )\r | |
287 | {\r | |
288 | ASSERT (Value != NULL);\r | |
289 | return InternalSyncCompareExchange32 (Value, CompareValue, ExchangeValue);\r | |
290 | }\r | |
291 | \r | |
292 | /**\r | |
293 | Performs an atomic compare exchange operation on a 64-bit unsigned integer.\r | |
294 | \r | |
1ea5ca46 | 295 | Performs an atomic compare exchange operation on the 64-bit unsigned integer specified \r |
296 | by Value. If Value is equal to CompareValue, then Value is set to ExchangeValue and \r | |
297 | CompareValue is returned. If Value is not equal to CompareValue, then Value is returned. \r | |
298 | The compare exchange operation must be performed using MP safe mechanisms.\r | |
299 | \r | |
300 | If Value is NULL, then ASSERT().\r | |
301 | \r | |
878ddf1f | 302 | @param Value A pointer to the 64-bit value for the compare exchange\r |
303 | operation.\r | |
304 | @param CompareValue 64-bit value used in compare operation.\r | |
305 | @param ExchangeValue 64-bit value used in exchange operation.\r | |
306 | \r | |
307 | @return The original *Value before exchange.\r | |
308 | \r | |
309 | **/\r | |
310 | UINT64\r | |
311 | EFIAPI\r | |
312 | InterlockedCompareExchange64 (\r | |
0ffa1286 | 313 | IN OUT UINT64 *Value,\r |
878ddf1f | 314 | IN UINT64 CompareValue,\r |
315 | IN UINT64 ExchangeValue\r | |
316 | )\r | |
317 | {\r | |
318 | ASSERT (Value != NULL);\r | |
319 | return InternalSyncCompareExchange64 (Value, CompareValue, ExchangeValue);\r | |
320 | }\r | |
321 | \r | |
322 | /**\r | |
323 | Performs an atomic compare exchange operation on a pointer value.\r | |
324 | \r | |
325 | Performs an atomic compare exchange operation on the pointer value specified\r | |
326 | by Value. If Value is equal to CompareValue, then Value is set to\r | |
327 | ExchangeValue and CompareValue is returned. If Value is not equal to\r | |
328 | CompareValue, then Value is returned. The compare exchange operation must be\r | |
329 | performed using MP safe mechanisms.\r | |
330 | \r | |
331 | If Value is NULL, then ASSERT().\r | |
332 | \r | |
333 | @param Value A pointer to the pointer value for the compare exchange\r | |
334 | operation.\r | |
335 | @param CompareValue Pointer value used in compare operation.\r | |
336 | @param ExchangeValue Pointer value used in exchange operation.\r | |
337 | \r | |
338 | **/\r | |
339 | VOID *\r | |
340 | EFIAPI\r | |
341 | InterlockedCompareExchangePointer (\r | |
0ffa1286 | 342 | IN OUT VOID **Value,\r |
878ddf1f | 343 | IN VOID *CompareValue,\r |
344 | IN VOID *ExchangeValue\r | |
345 | )\r | |
346 | {\r | |
58251024 | 347 | UINT8 SizeOfValue;\r |
348 | \r | |
349 | SizeOfValue = sizeof (*Value);\r | |
350 | \r | |
351 | switch (SizeOfValue) {\r | |
878ddf1f | 352 | case sizeof (UINT32):\r |
353 | return (VOID*)(UINTN)InterlockedCompareExchange32 (\r | |
354 | (UINT32*)Value,\r | |
355 | (UINT32)(UINTN)CompareValue,\r | |
356 | (UINT32)(UINTN)ExchangeValue\r | |
357 | );\r | |
358 | case sizeof (UINT64):\r | |
359 | return (VOID*)(UINTN)InterlockedCompareExchange64 (\r | |
360 | (UINT64*)Value,\r | |
361 | (UINT64)(UINTN)CompareValue,\r | |
362 | (UINT64)(UINTN)ExchangeValue\r | |
363 | );\r | |
364 | default:\r | |
365 | ASSERT (FALSE);\r | |
366 | return NULL;\r | |
367 | }\r | |
368 | }\r |