1 /****************************************************************************** 2 * 3 * Module Name: exsystem - Interface to OS services 4 * 5 *****************************************************************************/ 6 7 /****************************************************************************** 8 * 9 * 1. Copyright Notice 10 * 11 * Some or all of this work - Copyright (c) 1999 - 2013, Intel Corp. 12 * All rights reserved. 13 * 14 * 2. License 15 * 16 * 2.1. This is your license from Intel Corp. under its intellectual property 17 * rights. You may have additional license terms from the party that provided 18 * you this software, covering your right to use that party's intellectual 19 * property rights. 20 * 21 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a 22 * copy of the source code appearing in this file ("Covered Code") an 23 * irrevocable, perpetual, worldwide license under Intel's copyrights in the 24 * base code distributed originally by Intel ("Original Intel Code") to copy, 25 * make derivatives, distribute, use and display any portion of the Covered 26 * Code in any form, with the right to sublicense such rights; and 27 * 28 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent 29 * license (with the right to sublicense), under only those claims of Intel 30 * patents that are infringed by the Original Intel Code, to make, use, sell, 31 * offer to sell, and import the Covered Code and derivative works thereof 32 * solely to the minimum extent necessary to exercise the above copyright 33 * license, and in no event shall the patent license extend to any additions 34 * to or modifications of the Original Intel Code. No other license or right 35 * is granted directly or by implication, estoppel or otherwise; 36 * 37 * The above copyright and patent license is granted only if the following 38 * conditions are met: 39 * 40 * 3. Conditions 41 * 42 * 3.1. Redistribution of Source with Rights to Further Distribute Source. 43 * Redistribution of source code of any substantial portion of the Covered 44 * Code or modification with rights to further distribute source must include 45 * the above Copyright Notice, the above License, this list of Conditions, 46 * and the following Disclaimer and Export Compliance provision. In addition, 47 * Licensee must cause all Covered Code to which Licensee contributes to 48 * contain a file documenting the changes Licensee made to create that Covered 49 * Code and the date of any change. Licensee must include in that file the 50 * documentation of any changes made by any predecessor Licensee. Licensee 51 * must include a prominent statement that the modification is derived, 52 * directly or indirectly, from Original Intel Code. 53 * 54 * 3.2. Redistribution of Source with no Rights to Further Distribute Source. 55 * Redistribution of source code of any substantial portion of the Covered 56 * Code or modification without rights to further distribute source must 57 * include the following Disclaimer and Export Compliance provision in the 58 * documentation and/or other materials provided with distribution. In 59 * addition, Licensee may not authorize further sublicense of source of any 60 * portion of the Covered Code, and must include terms to the effect that the 61 * license from Licensee to its licensee is limited to the intellectual 62 * property embodied in the software Licensee provides to its licensee, and 63 * not to intellectual property embodied in modifications its licensee may 64 * make. 65 * 66 * 3.3. Redistribution of Executable. Redistribution in executable form of any 67 * substantial portion of the Covered Code or modification must reproduce the 68 * above Copyright Notice, and the following Disclaimer and Export Compliance 69 * provision in the documentation and/or other materials provided with the 70 * distribution. 71 * 72 * 3.4. Intel retains all right, title, and interest in and to the Original 73 * Intel Code. 74 * 75 * 3.5. Neither the name Intel nor any other trademark owned or controlled by 76 * Intel shall be used in advertising or otherwise to promote the sale, use or 77 * other dealings in products derived from or relating to the Covered Code 78 * without prior written authorization from Intel. 79 * 80 * 4. Disclaimer and Export Compliance 81 * 82 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED 83 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE 84 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, 85 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY 86 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY 87 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A 88 * PARTICULAR PURPOSE. 89 * 90 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES 91 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR 92 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, 93 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY 94 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL 95 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS 96 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY 97 * LIMITED REMEDY. 98 * 99 * 4.3. Licensee shall not export, either directly or indirectly, any of this 100 * software or system incorporating such software without first obtaining any 101 * required license or other approval from the U. S. Department of Commerce or 102 * any other agency or department of the United States Government. In the 103 * event Licensee exports any such software from the United States or 104 * re-exports any such software from a foreign destination, Licensee shall 105 * ensure that the distribution and export/re-export of the software is in 106 * compliance with all laws, regulations, orders, or other restrictions of the 107 * U.S. Export Administration Regulations. Licensee agrees that neither it nor 108 * any of its subsidiaries will export/re-export any technical data, process, 109 * software, or service, directly or indirectly, to any country for which the 110 * United States government or any agency thereof requires an export license, 111 * other governmental approval, or letter of assurance, without first obtaining 112 * such license, approval or letter. 113 * 114 *****************************************************************************/ 115 116 #define __EXSYSTEM_C__ 117 118 #include "acpi.h" 119 #include "accommon.h" 120 #include "acinterp.h" 121 122 #define _COMPONENT ACPI_EXECUTER 123 ACPI_MODULE_NAME ("exsystem") 124 125 126 /******************************************************************************* 127 * 128 * FUNCTION: AcpiExSystemWaitSemaphore 129 * 130 * PARAMETERS: Semaphore - Semaphore to wait on 131 * Timeout - Max time to wait 132 * 133 * RETURN: Status 134 * 135 * DESCRIPTION: Implements a semaphore wait with a check to see if the 136 * semaphore is available immediately. If it is not, the 137 * interpreter is released before waiting. 138 * 139 ******************************************************************************/ 140 141 ACPI_STATUS 142 AcpiExSystemWaitSemaphore ( 143 ACPI_SEMAPHORE Semaphore, 144 UINT16 Timeout) 145 { 146 ACPI_STATUS Status; 147 148 149 ACPI_FUNCTION_TRACE (ExSystemWaitSemaphore); 150 151 152 Status = AcpiOsWaitSemaphore (Semaphore, 1, ACPI_DO_NOT_WAIT); 153 if (ACPI_SUCCESS (Status)) 154 { 155 return_ACPI_STATUS (Status); 156 } 157 158 if (Status == AE_TIME) 159 { 160 /* We must wait, so unlock the interpreter */ 161 162 AcpiExRelinquishInterpreter (); 163 164 Status = AcpiOsWaitSemaphore (Semaphore, 1, Timeout); 165 166 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, 167 "*** Thread awake after blocking, %s\n", 168 AcpiFormatException (Status))); 169 170 /* Reacquire the interpreter */ 171 172 AcpiExReacquireInterpreter (); 173 } 174 175 return_ACPI_STATUS (Status); 176 } 177 178 179 /******************************************************************************* 180 * 181 * FUNCTION: AcpiExSystemWaitMutex 182 * 183 * PARAMETERS: Mutex - Mutex to wait on 184 * Timeout - Max time to wait 185 * 186 * RETURN: Status 187 * 188 * DESCRIPTION: Implements a mutex wait with a check to see if the 189 * mutex is available immediately. If it is not, the 190 * interpreter is released before waiting. 191 * 192 ******************************************************************************/ 193 194 ACPI_STATUS 195 AcpiExSystemWaitMutex ( 196 ACPI_MUTEX Mutex, 197 UINT16 Timeout) 198 { 199 ACPI_STATUS Status; 200 201 202 ACPI_FUNCTION_TRACE (ExSystemWaitMutex); 203 204 205 Status = AcpiOsAcquireMutex (Mutex, ACPI_DO_NOT_WAIT); 206 if (ACPI_SUCCESS (Status)) 207 { 208 return_ACPI_STATUS (Status); 209 } 210 211 if (Status == AE_TIME) 212 { 213 /* We must wait, so unlock the interpreter */ 214 215 AcpiExRelinquishInterpreter (); 216 217 Status = AcpiOsAcquireMutex (Mutex, Timeout); 218 219 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, 220 "*** Thread awake after blocking, %s\n", 221 AcpiFormatException (Status))); 222 223 /* Reacquire the interpreter */ 224 225 AcpiExReacquireInterpreter (); 226 } 227 228 return_ACPI_STATUS (Status); 229 } 230 231 232 /******************************************************************************* 233 * 234 * FUNCTION: AcpiExSystemDoStall 235 * 236 * PARAMETERS: HowLong - The amount of time to stall, 237 * in microseconds 238 * 239 * RETURN: Status 240 * 241 * DESCRIPTION: Suspend running thread for specified amount of time. 242 * Note: ACPI specification requires that Stall() does not 243 * relinquish the processor, and delays longer than 100 usec 244 * should use Sleep() instead. We allow stalls up to 255 usec 245 * for compatibility with other interpreters and existing BIOSs. 246 * 247 ******************************************************************************/ 248 249 ACPI_STATUS 250 AcpiExSystemDoStall ( 251 UINT32 HowLong) 252 { 253 ACPI_STATUS Status = AE_OK; 254 255 256 ACPI_FUNCTION_ENTRY (); 257 258 259 if (HowLong > 255) /* 255 microseconds */ 260 { 261 /* 262 * Longer than 255 usec, this is an error 263 * 264 * (ACPI specifies 100 usec as max, but this gives some slack in 265 * order to support existing BIOSs) 266 */ 267 ACPI_ERROR ((AE_INFO, "Time parameter is too large (%u)", 268 HowLong)); 269 Status = AE_AML_OPERAND_VALUE; 270 } 271 else 272 { 273 AcpiOsStall (HowLong); 274 } 275 276 return (Status); 277 } 278 279 280 /******************************************************************************* 281 * 282 * FUNCTION: AcpiExSystemDoSleep 283 * 284 * PARAMETERS: HowLong - The amount of time to sleep, 285 * in milliseconds 286 * 287 * RETURN: None 288 * 289 * DESCRIPTION: Sleep the running thread for specified amount of time. 290 * 291 ******************************************************************************/ 292 293 ACPI_STATUS 294 AcpiExSystemDoSleep ( 295 UINT64 HowLong) 296 { 297 ACPI_FUNCTION_ENTRY (); 298 299 300 /* Since this thread will sleep, we must release the interpreter */ 301 302 AcpiExRelinquishInterpreter (); 303 304 /* 305 * For compatibility with other ACPI implementations and to prevent 306 * accidental deep sleeps, limit the sleep time to something reasonable. 307 */ 308 if (HowLong > ACPI_MAX_SLEEP) 309 { 310 HowLong = ACPI_MAX_SLEEP; 311 } 312 313 AcpiOsSleep (HowLong); 314 315 /* And now we must get the interpreter again */ 316 317 AcpiExReacquireInterpreter (); 318 return (AE_OK); 319 } 320 321 322 /******************************************************************************* 323 * 324 * FUNCTION: AcpiExSystemSignalEvent 325 * 326 * PARAMETERS: ObjDesc - The object descriptor for this op 327 * 328 * RETURN: Status 329 * 330 * DESCRIPTION: Provides an access point to perform synchronization operations 331 * within the AML. 332 * 333 ******************************************************************************/ 334 335 ACPI_STATUS 336 AcpiExSystemSignalEvent ( 337 ACPI_OPERAND_OBJECT *ObjDesc) 338 { 339 ACPI_STATUS Status = AE_OK; 340 341 342 ACPI_FUNCTION_TRACE (ExSystemSignalEvent); 343 344 345 if (ObjDesc) 346 { 347 Status = AcpiOsSignalSemaphore (ObjDesc->Event.OsSemaphore, 1); 348 } 349 350 return_ACPI_STATUS (Status); 351 } 352 353 354 /******************************************************************************* 355 * 356 * FUNCTION: AcpiExSystemWaitEvent 357 * 358 * PARAMETERS: TimeDesc - The 'time to delay' object descriptor 359 * ObjDesc - The object descriptor for this op 360 * 361 * RETURN: Status 362 * 363 * DESCRIPTION: Provides an access point to perform synchronization operations 364 * within the AML. This operation is a request to wait for an 365 * event. 366 * 367 ******************************************************************************/ 368 369 ACPI_STATUS 370 AcpiExSystemWaitEvent ( 371 ACPI_OPERAND_OBJECT *TimeDesc, 372 ACPI_OPERAND_OBJECT *ObjDesc) 373 { 374 ACPI_STATUS Status = AE_OK; 375 376 377 ACPI_FUNCTION_TRACE (ExSystemWaitEvent); 378 379 380 if (ObjDesc) 381 { 382 Status = AcpiExSystemWaitSemaphore (ObjDesc->Event.OsSemaphore, 383 (UINT16) TimeDesc->Integer.Value); 384 } 385 386 return_ACPI_STATUS (Status); 387 } 388 389 390 /******************************************************************************* 391 * 392 * FUNCTION: AcpiExSystemResetEvent 393 * 394 * PARAMETERS: ObjDesc - The object descriptor for this op 395 * 396 * RETURN: Status 397 * 398 * DESCRIPTION: Reset an event to a known state. 399 * 400 ******************************************************************************/ 401 402 ACPI_STATUS 403 AcpiExSystemResetEvent ( 404 ACPI_OPERAND_OBJECT *ObjDesc) 405 { 406 ACPI_STATUS Status = AE_OK; 407 ACPI_SEMAPHORE TempSemaphore; 408 409 410 ACPI_FUNCTION_ENTRY (); 411 412 413 /* 414 * We are going to simply delete the existing semaphore and 415 * create a new one! 416 */ 417 Status = AcpiOsCreateSemaphore (ACPI_NO_UNIT_LIMIT, 0, &TempSemaphore); 418 if (ACPI_SUCCESS (Status)) 419 { 420 (void) AcpiOsDeleteSemaphore (ObjDesc->Event.OsSemaphore); 421 ObjDesc->Event.OsSemaphore = TempSemaphore; 422 } 423 424 return (Status); 425 } 426