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 - 2016, 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 #include "acpi.h" 117 #include "accommon.h" 118 #include "acinterp.h" 119 120 #define _COMPONENT ACPI_EXECUTER 121 ACPI_MODULE_NAME ("exsystem") 122 123 124 /******************************************************************************* 125 * 126 * FUNCTION: AcpiExSystemWaitSemaphore 127 * 128 * PARAMETERS: Semaphore - Semaphore to wait on 129 * Timeout - Max time to wait 130 * 131 * RETURN: Status 132 * 133 * DESCRIPTION: Implements a semaphore wait with a check to see if the 134 * semaphore is available immediately. If it is not, the 135 * interpreter is released before waiting. 136 * 137 ******************************************************************************/ 138 139 ACPI_STATUS 140 AcpiExSystemWaitSemaphore ( 141 ACPI_SEMAPHORE Semaphore, 142 UINT16 Timeout) 143 { 144 ACPI_STATUS Status; 145 146 147 ACPI_FUNCTION_TRACE (ExSystemWaitSemaphore); 148 149 150 Status = AcpiOsWaitSemaphore (Semaphore, 1, ACPI_DO_NOT_WAIT); 151 if (ACPI_SUCCESS (Status)) 152 { 153 return_ACPI_STATUS (Status); 154 } 155 156 if (Status == AE_TIME) 157 { 158 /* We must wait, so unlock the interpreter */ 159 160 AcpiExExitInterpreter (); 161 Status = AcpiOsWaitSemaphore (Semaphore, 1, Timeout); 162 163 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, 164 "*** Thread awake after blocking, %s\n", 165 AcpiFormatException (Status))); 166 167 /* Reacquire the interpreter */ 168 169 AcpiExEnterInterpreter (); 170 } 171 172 return_ACPI_STATUS (Status); 173 } 174 175 176 /******************************************************************************* 177 * 178 * FUNCTION: AcpiExSystemWaitMutex 179 * 180 * PARAMETERS: Mutex - Mutex to wait on 181 * Timeout - Max time to wait 182 * 183 * RETURN: Status 184 * 185 * DESCRIPTION: Implements a mutex wait with a check to see if the 186 * mutex is available immediately. If it is not, the 187 * interpreter is released before waiting. 188 * 189 ******************************************************************************/ 190 191 ACPI_STATUS 192 AcpiExSystemWaitMutex ( 193 ACPI_MUTEX Mutex, 194 UINT16 Timeout) 195 { 196 ACPI_STATUS Status; 197 198 199 ACPI_FUNCTION_TRACE (ExSystemWaitMutex); 200 201 202 Status = AcpiOsAcquireMutex (Mutex, ACPI_DO_NOT_WAIT); 203 if (ACPI_SUCCESS (Status)) 204 { 205 return_ACPI_STATUS (Status); 206 } 207 208 if (Status == AE_TIME) 209 { 210 /* We must wait, so unlock the interpreter */ 211 212 AcpiExExitInterpreter (); 213 Status = AcpiOsAcquireMutex (Mutex, Timeout); 214 215 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, 216 "*** Thread awake after blocking, %s\n", 217 AcpiFormatException (Status))); 218 219 /* Reacquire the interpreter */ 220 221 AcpiExEnterInterpreter (); 222 } 223 224 return_ACPI_STATUS (Status); 225 } 226 227 228 /******************************************************************************* 229 * 230 * FUNCTION: AcpiExSystemDoStall 231 * 232 * PARAMETERS: HowLong - The amount of time to stall, 233 * in microseconds 234 * 235 * RETURN: Status 236 * 237 * DESCRIPTION: Suspend running thread for specified amount of time. 238 * Note: ACPI specification requires that Stall() does not 239 * relinquish the processor, and delays longer than 100 usec 240 * should use Sleep() instead. We allow stalls up to 255 usec 241 * for compatibility with other interpreters and existing BIOSs. 242 * 243 ******************************************************************************/ 244 245 ACPI_STATUS 246 AcpiExSystemDoStall ( 247 UINT32 HowLong) 248 { 249 ACPI_STATUS Status = AE_OK; 250 251 252 ACPI_FUNCTION_ENTRY (); 253 254 255 if (HowLong > 255) /* 255 microseconds */ 256 { 257 /* 258 * Longer than 255 usec, this is an error 259 * 260 * (ACPI specifies 100 usec as max, but this gives some slack in 261 * order to support existing BIOSs) 262 */ 263 ACPI_ERROR ((AE_INFO, 264 "Time parameter is too large (%u)", HowLong)); 265 Status = AE_AML_OPERAND_VALUE; 266 } 267 else 268 { 269 AcpiOsStall (HowLong); 270 } 271 272 return (Status); 273 } 274 275 276 /******************************************************************************* 277 * 278 * FUNCTION: AcpiExSystemDoSleep 279 * 280 * PARAMETERS: HowLong - The amount of time to sleep, 281 * in milliseconds 282 * 283 * RETURN: None 284 * 285 * DESCRIPTION: Sleep the running thread for specified amount of time. 286 * 287 ******************************************************************************/ 288 289 ACPI_STATUS 290 AcpiExSystemDoSleep ( 291 UINT64 HowLong) 292 { 293 ACPI_FUNCTION_ENTRY (); 294 295 296 /* Since this thread will sleep, we must release the interpreter */ 297 298 AcpiExExitInterpreter (); 299 300 /* 301 * For compatibility with other ACPI implementations and to prevent 302 * accidental deep sleeps, limit the sleep time to something reasonable. 303 */ 304 if (HowLong > ACPI_MAX_SLEEP) 305 { 306 HowLong = ACPI_MAX_SLEEP; 307 } 308 309 AcpiOsSleep (HowLong); 310 311 /* And now we must get the interpreter again */ 312 313 AcpiExEnterInterpreter (); 314 return (AE_OK); 315 } 316 317 318 /******************************************************************************* 319 * 320 * FUNCTION: AcpiExSystemSignalEvent 321 * 322 * PARAMETERS: ObjDesc - The object descriptor for this op 323 * 324 * RETURN: Status 325 * 326 * DESCRIPTION: Provides an access point to perform synchronization operations 327 * within the AML. 328 * 329 ******************************************************************************/ 330 331 ACPI_STATUS 332 AcpiExSystemSignalEvent ( 333 ACPI_OPERAND_OBJECT *ObjDesc) 334 { 335 ACPI_STATUS Status = AE_OK; 336 337 338 ACPI_FUNCTION_TRACE (ExSystemSignalEvent); 339 340 341 if (ObjDesc) 342 { 343 Status = AcpiOsSignalSemaphore (ObjDesc->Event.OsSemaphore, 1); 344 } 345 346 return_ACPI_STATUS (Status); 347 } 348 349 350 /******************************************************************************* 351 * 352 * FUNCTION: AcpiExSystemWaitEvent 353 * 354 * PARAMETERS: TimeDesc - The 'time to delay' object descriptor 355 * ObjDesc - The object descriptor for this op 356 * 357 * RETURN: Status 358 * 359 * DESCRIPTION: Provides an access point to perform synchronization operations 360 * within the AML. This operation is a request to wait for an 361 * event. 362 * 363 ******************************************************************************/ 364 365 ACPI_STATUS 366 AcpiExSystemWaitEvent ( 367 ACPI_OPERAND_OBJECT *TimeDesc, 368 ACPI_OPERAND_OBJECT *ObjDesc) 369 { 370 ACPI_STATUS Status = AE_OK; 371 372 373 ACPI_FUNCTION_TRACE (ExSystemWaitEvent); 374 375 376 if (ObjDesc) 377 { 378 Status = AcpiExSystemWaitSemaphore (ObjDesc->Event.OsSemaphore, 379 (UINT16) TimeDesc->Integer.Value); 380 } 381 382 return_ACPI_STATUS (Status); 383 } 384 385 386 /******************************************************************************* 387 * 388 * FUNCTION: AcpiExSystemResetEvent 389 * 390 * PARAMETERS: ObjDesc - The object descriptor for this op 391 * 392 * RETURN: Status 393 * 394 * DESCRIPTION: Reset an event to a known state. 395 * 396 ******************************************************************************/ 397 398 ACPI_STATUS 399 AcpiExSystemResetEvent ( 400 ACPI_OPERAND_OBJECT *ObjDesc) 401 { 402 ACPI_STATUS Status = AE_OK; 403 ACPI_SEMAPHORE TempSemaphore; 404 405 406 ACPI_FUNCTION_ENTRY (); 407 408 409 /* 410 * We are going to simply delete the existing semaphore and 411 * create a new one! 412 */ 413 Status = AcpiOsCreateSemaphore (ACPI_NO_UNIT_LIMIT, 0, &TempSemaphore); 414 if (ACPI_SUCCESS (Status)) 415 { 416 (void) AcpiOsDeleteSemaphore (ObjDesc->Event.OsSemaphore); 417 ObjDesc->Event.OsSemaphore = TempSemaphore; 418 } 419 420 return (Status); 421 } 422