1 /******************************************************************************
2 *
3 * Module Name: exsystem - Interface to OS services
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2016, Intel Corp.
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions, and the following disclaimer,
16 * without modification.
17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18 * substantially similar to the "NO WARRANTY" disclaimer below
19 * ("Disclaimer") and any redistribution must be conditioned upon
20 * including a substantially similar Disclaimer requirement for further
21 * binary redistribution.
22 * 3. Neither the names of the above-listed copyright holders nor the names
23 * of any contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
25 *
26 * Alternatively, this software may be distributed under the terms of the
27 * GNU General Public License ("GPL") version 2 as published by the Free
28 * Software Foundation.
29 *
30 * NO WARRANTY
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41 * POSSIBILITY OF SUCH DAMAGES.
42 */
43
44 #include "acpi.h"
45 #include "accommon.h"
46 #include "acinterp.h"
47
48 #define _COMPONENT ACPI_EXECUTER
49 ACPI_MODULE_NAME ("exsystem")
50
51
52 /*******************************************************************************
53 *
54 * FUNCTION: AcpiExSystemWaitSemaphore
55 *
56 * PARAMETERS: Semaphore - Semaphore to wait on
57 * Timeout - Max time to wait
58 *
59 * RETURN: Status
60 *
61 * DESCRIPTION: Implements a semaphore wait with a check to see if the
62 * semaphore is available immediately. If it is not, the
63 * interpreter is released before waiting.
64 *
65 ******************************************************************************/
66
67 ACPI_STATUS
AcpiExSystemWaitSemaphore(ACPI_SEMAPHORE Semaphore,UINT16 Timeout)68 AcpiExSystemWaitSemaphore (
69 ACPI_SEMAPHORE Semaphore,
70 UINT16 Timeout)
71 {
72 ACPI_STATUS Status;
73
74
75 ACPI_FUNCTION_TRACE (ExSystemWaitSemaphore);
76
77
78 Status = AcpiOsWaitSemaphore (Semaphore, 1, ACPI_DO_NOT_WAIT);
79 if (ACPI_SUCCESS (Status))
80 {
81 return_ACPI_STATUS (Status);
82 }
83
84 if (Status == AE_TIME)
85 {
86 /* We must wait, so unlock the interpreter */
87
88 AcpiExExitInterpreter ();
89 Status = AcpiOsWaitSemaphore (Semaphore, 1, Timeout);
90
91 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
92 "*** Thread awake after blocking, %s\n",
93 AcpiFormatException (Status)));
94
95 /* Reacquire the interpreter */
96
97 AcpiExEnterInterpreter ();
98 }
99
100 return_ACPI_STATUS (Status);
101 }
102
103
104 /*******************************************************************************
105 *
106 * FUNCTION: AcpiExSystemWaitMutex
107 *
108 * PARAMETERS: Mutex - Mutex to wait on
109 * Timeout - Max time to wait
110 *
111 * RETURN: Status
112 *
113 * DESCRIPTION: Implements a mutex wait with a check to see if the
114 * mutex is available immediately. If it is not, the
115 * interpreter is released before waiting.
116 *
117 ******************************************************************************/
118
119 ACPI_STATUS
AcpiExSystemWaitMutex(ACPI_MUTEX Mutex,UINT16 Timeout)120 AcpiExSystemWaitMutex (
121 ACPI_MUTEX Mutex,
122 UINT16 Timeout)
123 {
124 ACPI_STATUS Status;
125
126
127 ACPI_FUNCTION_TRACE (ExSystemWaitMutex);
128
129
130 Status = AcpiOsAcquireMutex (Mutex, ACPI_DO_NOT_WAIT);
131 if (ACPI_SUCCESS (Status))
132 {
133 return_ACPI_STATUS (Status);
134 }
135
136 if (Status == AE_TIME)
137 {
138 /* We must wait, so unlock the interpreter */
139
140 AcpiExExitInterpreter ();
141 Status = AcpiOsAcquireMutex (Mutex, Timeout);
142
143 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
144 "*** Thread awake after blocking, %s\n",
145 AcpiFormatException (Status)));
146
147 /* Reacquire the interpreter */
148
149 AcpiExEnterInterpreter ();
150 }
151
152 return_ACPI_STATUS (Status);
153 }
154
155
156 /*******************************************************************************
157 *
158 * FUNCTION: AcpiExSystemDoStall
159 *
160 * PARAMETERS: HowLong - The amount of time to stall,
161 * in microseconds
162 *
163 * RETURN: Status
164 *
165 * DESCRIPTION: Suspend running thread for specified amount of time.
166 * Note: ACPI specification requires that Stall() does not
167 * relinquish the processor, and delays longer than 100 usec
168 * should use Sleep() instead. We allow stalls up to 255 usec
169 * for compatibility with other interpreters and existing BIOSs.
170 *
171 ******************************************************************************/
172
173 ACPI_STATUS
AcpiExSystemDoStall(UINT32 HowLong)174 AcpiExSystemDoStall (
175 UINT32 HowLong)
176 {
177 ACPI_STATUS Status = AE_OK;
178
179
180 ACPI_FUNCTION_ENTRY ();
181
182
183 if (HowLong > 255) /* 255 microseconds */
184 {
185 /*
186 * Longer than 255 usec, this is an error
187 *
188 * (ACPI specifies 100 usec as max, but this gives some slack in
189 * order to support existing BIOSs)
190 */
191 ACPI_ERROR ((AE_INFO,
192 "Time parameter is too large (%u)", HowLong));
193 Status = AE_AML_OPERAND_VALUE;
194 }
195 else
196 {
197 AcpiOsStall (HowLong);
198 }
199
200 return (Status);
201 }
202
203
204 /*******************************************************************************
205 *
206 * FUNCTION: AcpiExSystemDoSleep
207 *
208 * PARAMETERS: HowLong - The amount of time to sleep,
209 * in milliseconds
210 *
211 * RETURN: None
212 *
213 * DESCRIPTION: Sleep the running thread for specified amount of time.
214 *
215 ******************************************************************************/
216
217 ACPI_STATUS
AcpiExSystemDoSleep(UINT64 HowLong)218 AcpiExSystemDoSleep (
219 UINT64 HowLong)
220 {
221 ACPI_FUNCTION_ENTRY ();
222
223
224 /* Since this thread will sleep, we must release the interpreter */
225
226 AcpiExExitInterpreter ();
227
228 /*
229 * For compatibility with other ACPI implementations and to prevent
230 * accidental deep sleeps, limit the sleep time to something reasonable.
231 */
232 if (HowLong > ACPI_MAX_SLEEP)
233 {
234 HowLong = ACPI_MAX_SLEEP;
235 }
236
237 AcpiOsSleep (HowLong);
238
239 /* And now we must get the interpreter again */
240
241 AcpiExEnterInterpreter ();
242 return (AE_OK);
243 }
244
245
246 /*******************************************************************************
247 *
248 * FUNCTION: AcpiExSystemSignalEvent
249 *
250 * PARAMETERS: ObjDesc - The object descriptor for this op
251 *
252 * RETURN: Status
253 *
254 * DESCRIPTION: Provides an access point to perform synchronization operations
255 * within the AML.
256 *
257 ******************************************************************************/
258
259 ACPI_STATUS
AcpiExSystemSignalEvent(ACPI_OPERAND_OBJECT * ObjDesc)260 AcpiExSystemSignalEvent (
261 ACPI_OPERAND_OBJECT *ObjDesc)
262 {
263 ACPI_STATUS Status = AE_OK;
264
265
266 ACPI_FUNCTION_TRACE (ExSystemSignalEvent);
267
268
269 if (ObjDesc)
270 {
271 Status = AcpiOsSignalSemaphore (ObjDesc->Event.OsSemaphore, 1);
272 }
273
274 return_ACPI_STATUS (Status);
275 }
276
277
278 /*******************************************************************************
279 *
280 * FUNCTION: AcpiExSystemWaitEvent
281 *
282 * PARAMETERS: TimeDesc - The 'time to delay' object descriptor
283 * ObjDesc - The object descriptor for this op
284 *
285 * RETURN: Status
286 *
287 * DESCRIPTION: Provides an access point to perform synchronization operations
288 * within the AML. This operation is a request to wait for an
289 * event.
290 *
291 ******************************************************************************/
292
293 ACPI_STATUS
AcpiExSystemWaitEvent(ACPI_OPERAND_OBJECT * TimeDesc,ACPI_OPERAND_OBJECT * ObjDesc)294 AcpiExSystemWaitEvent (
295 ACPI_OPERAND_OBJECT *TimeDesc,
296 ACPI_OPERAND_OBJECT *ObjDesc)
297 {
298 ACPI_STATUS Status = AE_OK;
299
300
301 ACPI_FUNCTION_TRACE (ExSystemWaitEvent);
302
303
304 if (ObjDesc)
305 {
306 Status = AcpiExSystemWaitSemaphore (ObjDesc->Event.OsSemaphore,
307 (UINT16) TimeDesc->Integer.Value);
308 }
309
310 return_ACPI_STATUS (Status);
311 }
312
313
314 /*******************************************************************************
315 *
316 * FUNCTION: AcpiExSystemResetEvent
317 *
318 * PARAMETERS: ObjDesc - The object descriptor for this op
319 *
320 * RETURN: Status
321 *
322 * DESCRIPTION: Reset an event to a known state.
323 *
324 ******************************************************************************/
325
326 ACPI_STATUS
AcpiExSystemResetEvent(ACPI_OPERAND_OBJECT * ObjDesc)327 AcpiExSystemResetEvent (
328 ACPI_OPERAND_OBJECT *ObjDesc)
329 {
330 ACPI_STATUS Status = AE_OK;
331 ACPI_SEMAPHORE TempSemaphore;
332
333
334 ACPI_FUNCTION_ENTRY ();
335
336
337 /*
338 * We are going to simply delete the existing semaphore and
339 * create a new one!
340 */
341 Status = AcpiOsCreateSemaphore (ACPI_NO_UNIT_LIMIT, 0, &TempSemaphore);
342 if (ACPI_SUCCESS (Status))
343 {
344 (void) AcpiOsDeleteSemaphore (ObjDesc->Event.OsSemaphore);
345 ObjDesc->Event.OsSemaphore = TempSemaphore;
346 }
347
348 return (Status);
349 }
350