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 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 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 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 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 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 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 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