1 /******************************************************************************
3 * Module Name: exsystem - Interface to OS services
5 *****************************************************************************/
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44 #include <contrib/dev/acpica/include/acpi.h>
45 #include <contrib/dev/acpica/include/accommon.h>
46 #include <contrib/dev/acpica/include/acinterp.h>
48 #define _COMPONENT ACPI_EXECUTER
49 ACPI_MODULE_NAME ("exsystem")
52 /*******************************************************************************
54 * FUNCTION: AcpiExSystemWaitSemaphore
56 * PARAMETERS: Semaphore - Semaphore to wait on
57 * Timeout - Max time to wait
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.
65 ******************************************************************************/
68 AcpiExSystemWaitSemaphore (
69 ACPI_SEMAPHORE Semaphore,
75 ACPI_FUNCTION_TRACE (ExSystemWaitSemaphore);
78 Status = AcpiOsWaitSemaphore (Semaphore, 1, ACPI_DO_NOT_WAIT);
79 if (ACPI_SUCCESS (Status))
81 return_ACPI_STATUS (Status);
84 if (Status == AE_TIME)
86 /* We must wait, so unlock the interpreter */
88 AcpiExExitInterpreter ();
89 Status = AcpiOsWaitSemaphore (Semaphore, 1, Timeout);
91 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
92 "*** Thread awake after blocking, %s\n",
93 AcpiFormatException (Status)));
95 /* Reacquire the interpreter */
97 AcpiExEnterInterpreter ();
100 return_ACPI_STATUS (Status);
104 /*******************************************************************************
106 * FUNCTION: AcpiExSystemWaitMutex
108 * PARAMETERS: Mutex - Mutex to wait on
109 * Timeout - Max time to wait
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.
117 ******************************************************************************/
120 AcpiExSystemWaitMutex (
127 ACPI_FUNCTION_TRACE (ExSystemWaitMutex);
130 Status = AcpiOsAcquireMutex (Mutex, ACPI_DO_NOT_WAIT);
131 if (ACPI_SUCCESS (Status))
133 return_ACPI_STATUS (Status);
136 if (Status == AE_TIME)
138 /* We must wait, so unlock the interpreter */
140 AcpiExExitInterpreter ();
141 Status = AcpiOsAcquireMutex (Mutex, Timeout);
143 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
144 "*** Thread awake after blocking, %s\n",
145 AcpiFormatException (Status)));
147 /* Reacquire the interpreter */
149 AcpiExEnterInterpreter ();
152 return_ACPI_STATUS (Status);
156 /*******************************************************************************
158 * FUNCTION: AcpiExSystemDoStall
160 * PARAMETERS: HowLong - The amount of time to stall,
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.
171 ******************************************************************************/
174 AcpiExSystemDoStall (
177 ACPI_STATUS Status = AE_OK;
180 ACPI_FUNCTION_ENTRY ();
183 if (HowLong > 255) /* 255 microseconds */
186 * Longer than 255 usec, this is an error
188 * (ACPI specifies 100 usec as max, but this gives some slack in
189 * order to support existing BIOSs)
191 ACPI_ERROR ((AE_INFO,
192 "Time parameter is too large (%u)", HowLong));
193 Status = AE_AML_OPERAND_VALUE;
197 AcpiOsStall (HowLong);
204 /*******************************************************************************
206 * FUNCTION: AcpiExSystemDoSleep
208 * PARAMETERS: HowLong - The amount of time to sleep,
213 * DESCRIPTION: Sleep the running thread for specified amount of time.
215 ******************************************************************************/
218 AcpiExSystemDoSleep (
221 ACPI_FUNCTION_ENTRY ();
224 /* Since this thread will sleep, we must release the interpreter */
226 AcpiExExitInterpreter ();
229 * For compatibility with other ACPI implementations and to prevent
230 * accidental deep sleeps, limit the sleep time to something reasonable.
232 if (HowLong > ACPI_MAX_SLEEP)
234 HowLong = ACPI_MAX_SLEEP;
237 AcpiOsSleep (HowLong);
239 /* And now we must get the interpreter again */
241 AcpiExEnterInterpreter ();
246 /*******************************************************************************
248 * FUNCTION: AcpiExSystemSignalEvent
250 * PARAMETERS: ObjDesc - The object descriptor for this op
254 * DESCRIPTION: Provides an access point to perform synchronization operations
257 ******************************************************************************/
260 AcpiExSystemSignalEvent (
261 ACPI_OPERAND_OBJECT *ObjDesc)
263 ACPI_STATUS Status = AE_OK;
266 ACPI_FUNCTION_TRACE (ExSystemSignalEvent);
271 Status = AcpiOsSignalSemaphore (ObjDesc->Event.OsSemaphore, 1);
274 return_ACPI_STATUS (Status);
278 /*******************************************************************************
280 * FUNCTION: AcpiExSystemWaitEvent
282 * PARAMETERS: TimeDesc - The 'time to delay' object descriptor
283 * ObjDesc - The object descriptor for this op
287 * DESCRIPTION: Provides an access point to perform synchronization operations
288 * within the AML. This operation is a request to wait for an
291 ******************************************************************************/
294 AcpiExSystemWaitEvent (
295 ACPI_OPERAND_OBJECT *TimeDesc,
296 ACPI_OPERAND_OBJECT *ObjDesc)
298 ACPI_STATUS Status = AE_OK;
301 ACPI_FUNCTION_TRACE (ExSystemWaitEvent);
306 Status = AcpiExSystemWaitSemaphore (ObjDesc->Event.OsSemaphore,
307 (UINT16) TimeDesc->Integer.Value);
310 return_ACPI_STATUS (Status);
314 /*******************************************************************************
316 * FUNCTION: AcpiExSystemResetEvent
318 * PARAMETERS: ObjDesc - The object descriptor for this op
322 * DESCRIPTION: Reset an event to a known state.
324 ******************************************************************************/
327 AcpiExSystemResetEvent (
328 ACPI_OPERAND_OBJECT *ObjDesc)
330 ACPI_STATUS Status = AE_OK;
331 ACPI_SEMAPHORE TempSemaphore;
334 ACPI_FUNCTION_ENTRY ();
338 * We are going to simply delete the existing semaphore and
341 Status = AcpiOsCreateSemaphore (ACPI_NO_UNIT_LIMIT, 0, &TempSemaphore);
342 if (ACPI_SUCCESS (Status))
344 (void) AcpiOsDeleteSemaphore (ObjDesc->Event.OsSemaphore);
345 ObjDesc->Event.OsSemaphore = TempSemaphore;