1 2 /****************************************************************************** 3 * 4 * Module Name: exsystem - Interface to OS services 5 * $Revision: 1.95 $ 6 * 7 *****************************************************************************/ 8 9 /****************************************************************************** 10 * 11 * 1. Copyright Notice 12 * 13 * Some or all of this work - Copyright (c) 1999 - 2008, Intel Corp. 14 * All rights reserved. 15 * 16 * 2. License 17 * 18 * 2.1. This is your license from Intel Corp. under its intellectual property 19 * rights. You may have additional license terms from the party that provided 20 * you this software, covering your right to use that party's intellectual 21 * property rights. 22 * 23 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a 24 * copy of the source code appearing in this file ("Covered Code") an 25 * irrevocable, perpetual, worldwide license under Intel's copyrights in the 26 * base code distributed originally by Intel ("Original Intel Code") to copy, 27 * make derivatives, distribute, use and display any portion of the Covered 28 * Code in any form, with the right to sublicense such rights; and 29 * 30 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent 31 * license (with the right to sublicense), under only those claims of Intel 32 * patents that are infringed by the Original Intel Code, to make, use, sell, 33 * offer to sell, and import the Covered Code and derivative works thereof 34 * solely to the minimum extent necessary to exercise the above copyright 35 * license, and in no event shall the patent license extend to any additions 36 * to or modifications of the Original Intel Code. No other license or right 37 * is granted directly or by implication, estoppel or otherwise; 38 * 39 * The above copyright and patent license is granted only if the following 40 * conditions are met: 41 * 42 * 3. Conditions 43 * 44 * 3.1. Redistribution of Source with Rights to Further Distribute Source. 45 * Redistribution of source code of any substantial portion of the Covered 46 * Code or modification with rights to further distribute source must include 47 * the above Copyright Notice, the above License, this list of Conditions, 48 * and the following Disclaimer and Export Compliance provision. In addition, 49 * Licensee must cause all Covered Code to which Licensee contributes to 50 * contain a file documenting the changes Licensee made to create that Covered 51 * Code and the date of any change. Licensee must include in that file the 52 * documentation of any changes made by any predecessor Licensee. Licensee 53 * must include a prominent statement that the modification is derived, 54 * directly or indirectly, from Original Intel Code. 55 * 56 * 3.2. Redistribution of Source with no Rights to Further Distribute Source. 57 * Redistribution of source code of any substantial portion of the Covered 58 * Code or modification without rights to further distribute source must 59 * include the following Disclaimer and Export Compliance provision in the 60 * documentation and/or other materials provided with distribution. In 61 * addition, Licensee may not authorize further sublicense of source of any 62 * portion of the Covered Code, and must include terms to the effect that the 63 * license from Licensee to its licensee is limited to the intellectual 64 * property embodied in the software Licensee provides to its licensee, and 65 * not to intellectual property embodied in modifications its licensee may 66 * make. 67 * 68 * 3.3. Redistribution of Executable. Redistribution in executable form of any 69 * substantial portion of the Covered Code or modification must reproduce the 70 * above Copyright Notice, and the following Disclaimer and Export Compliance 71 * provision in the documentation and/or other materials provided with the 72 * distribution. 73 * 74 * 3.4. Intel retains all right, title, and interest in and to the Original 75 * Intel Code. 76 * 77 * 3.5. Neither the name Intel nor any other trademark owned or controlled by 78 * Intel shall be used in advertising or otherwise to promote the sale, use or 79 * other dealings in products derived from or relating to the Covered Code 80 * without prior written authorization from Intel. 81 * 82 * 4. Disclaimer and Export Compliance 83 * 84 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED 85 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE 86 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, 87 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY 88 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY 89 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A 90 * PARTICULAR PURPOSE. 91 * 92 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES 93 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR 94 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, 95 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY 96 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL 97 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS 98 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY 99 * LIMITED REMEDY. 100 * 101 * 4.3. Licensee shall not export, either directly or indirectly, any of this 102 * software or system incorporating such software without first obtaining any 103 * required license or other approval from the U. S. Department of Commerce or 104 * any other agency or department of the United States Government. In the 105 * event Licensee exports any such software from the United States or 106 * re-exports any such software from a foreign destination, Licensee shall 107 * ensure that the distribution and export/re-export of the software is in 108 * compliance with all laws, regulations, orders, or other restrictions of the 109 * U.S. Export Administration Regulations. Licensee agrees that neither it nor 110 * any of its subsidiaries will export/re-export any technical data, process, 111 * software, or service, directly or indirectly, to any country for which the 112 * United States government or any agency thereof requires an export license, 113 * other governmental approval, or letter of assurance, without first obtaining 114 * such license, approval or letter. 115 * 116 *****************************************************************************/ 117 118 #define __EXSYSTEM_C__ 119 120 #include "acpi.h" 121 #include "acinterp.h" 122 123 #define _COMPONENT ACPI_EXECUTER 124 ACPI_MODULE_NAME ("exsystem") 125 126 127 /******************************************************************************* 128 * 129 * FUNCTION: AcpiExSystemWaitSemaphore 130 * 131 * PARAMETERS: Semaphore - Semaphore to wait on 132 * Timeout - Max time to wait 133 * 134 * RETURN: Status 135 * 136 * DESCRIPTION: Implements a semaphore wait with a check to see if the 137 * semaphore is available immediately. If it is not, the 138 * interpreter is released before waiting. 139 * 140 ******************************************************************************/ 141 142 ACPI_STATUS 143 AcpiExSystemWaitSemaphore ( 144 ACPI_SEMAPHORE Semaphore, 145 UINT16 Timeout) 146 { 147 ACPI_STATUS Status; 148 149 150 ACPI_FUNCTION_TRACE (ExSystemWaitSemaphore); 151 152 153 Status = AcpiOsWaitSemaphore (Semaphore, 1, ACPI_DO_NOT_WAIT); 154 if (ACPI_SUCCESS (Status)) 155 { 156 return_ACPI_STATUS (Status); 157 } 158 159 if (Status == AE_TIME) 160 { 161 /* We must wait, so unlock the interpreter */ 162 163 AcpiExRelinquishInterpreter (); 164 165 Status = AcpiOsWaitSemaphore (Semaphore, 1, Timeout); 166 167 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, 168 "*** Thread awake after blocking, %s\n", 169 AcpiFormatException (Status))); 170 171 /* Reacquire the interpreter */ 172 173 AcpiExReacquireInterpreter (); 174 } 175 176 return_ACPI_STATUS (Status); 177 } 178 179 180 /******************************************************************************* 181 * 182 * FUNCTION: AcpiExSystemWaitMutex 183 * 184 * PARAMETERS: Mutex - Mutex to wait on 185 * Timeout - Max time to wait 186 * 187 * RETURN: Status 188 * 189 * DESCRIPTION: Implements a mutex wait with a check to see if the 190 * mutex is available immediately. If it is not, the 191 * interpreter is released before waiting. 192 * 193 ******************************************************************************/ 194 195 ACPI_STATUS 196 AcpiExSystemWaitMutex ( 197 ACPI_MUTEX Mutex, 198 UINT16 Timeout) 199 { 200 ACPI_STATUS Status; 201 202 203 ACPI_FUNCTION_TRACE (ExSystemWaitMutex); 204 205 206 Status = AcpiOsAcquireMutex (Mutex, ACPI_DO_NOT_WAIT); 207 if (ACPI_SUCCESS (Status)) 208 { 209 return_ACPI_STATUS (Status); 210 } 211 212 if (Status == AE_TIME) 213 { 214 /* We must wait, so unlock the interpreter */ 215 216 AcpiExRelinquishInterpreter (); 217 218 Status = AcpiOsAcquireMutex (Mutex, Timeout); 219 220 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, 221 "*** Thread awake after blocking, %s\n", 222 AcpiFormatException (Status))); 223 224 /* Reacquire the interpreter */ 225 226 AcpiExReacquireInterpreter (); 227 } 228 229 return_ACPI_STATUS (Status); 230 } 231 232 233 /******************************************************************************* 234 * 235 * FUNCTION: AcpiExSystemDoStall 236 * 237 * PARAMETERS: HowLong - The amount of time to stall, 238 * in microseconds 239 * 240 * RETURN: Status 241 * 242 * DESCRIPTION: Suspend running thread for specified amount of time. 243 * Note: ACPI specification requires that Stall() does not 244 * relinquish the processor, and delays longer than 100 usec 245 * should use Sleep() instead. We allow stalls up to 255 usec 246 * for compatibility with other interpreters and existing BIOSs. 247 * 248 ******************************************************************************/ 249 250 ACPI_STATUS 251 AcpiExSystemDoStall ( 252 UINT32 HowLong) 253 { 254 ACPI_STATUS Status = AE_OK; 255 256 257 ACPI_FUNCTION_ENTRY (); 258 259 260 if (HowLong > 255) /* 255 microseconds */ 261 { 262 /* 263 * Longer than 255 usec, this is an error 264 * 265 * (ACPI specifies 100 usec as max, but this gives some slack in 266 * order to support existing BIOSs) 267 */ 268 ACPI_ERROR ((AE_INFO, "Time parameter is too large (%d)", 269 HowLong)); 270 Status = AE_AML_OPERAND_VALUE; 271 } 272 else 273 { 274 AcpiOsStall (HowLong); 275 } 276 277 return (Status); 278 } 279 280 281 /******************************************************************************* 282 * 283 * FUNCTION: AcpiExSystemDoSuspend 284 * 285 * PARAMETERS: HowLong - The amount of time to suspend, 286 * in milliseconds 287 * 288 * RETURN: None 289 * 290 * DESCRIPTION: Suspend running thread for specified amount of time. 291 * 292 ******************************************************************************/ 293 294 ACPI_STATUS 295 AcpiExSystemDoSuspend ( 296 ACPI_INTEGER HowLong) 297 { 298 ACPI_FUNCTION_ENTRY (); 299 300 301 /* Since this thread will sleep, we must release the interpreter */ 302 303 AcpiExRelinquishInterpreter (); 304 305 AcpiOsSleep (HowLong); 306 307 /* And now we must get the interpreter again */ 308 309 AcpiExReacquireInterpreter (); 310 return (AE_OK); 311 } 312 313 314 /******************************************************************************* 315 * 316 * FUNCTION: AcpiExSystemSignalEvent 317 * 318 * PARAMETERS: ObjDesc - The object descriptor for this op 319 * 320 * RETURN: Status 321 * 322 * DESCRIPTION: Provides an access point to perform synchronization operations 323 * within the AML. 324 * 325 ******************************************************************************/ 326 327 ACPI_STATUS 328 AcpiExSystemSignalEvent ( 329 ACPI_OPERAND_OBJECT *ObjDesc) 330 { 331 ACPI_STATUS Status = AE_OK; 332 333 334 ACPI_FUNCTION_TRACE (ExSystemSignalEvent); 335 336 337 if (ObjDesc) 338 { 339 Status = AcpiOsSignalSemaphore (ObjDesc->Event.OsSemaphore, 1); 340 } 341 342 return_ACPI_STATUS (Status); 343 } 344 345 346 /******************************************************************************* 347 * 348 * FUNCTION: AcpiExSystemWaitEvent 349 * 350 * PARAMETERS: TimeDesc - The 'time to delay' object descriptor 351 * ObjDesc - The object descriptor for this op 352 * 353 * RETURN: Status 354 * 355 * DESCRIPTION: Provides an access point to perform synchronization operations 356 * within the AML. This operation is a request to wait for an 357 * event. 358 * 359 ******************************************************************************/ 360 361 ACPI_STATUS 362 AcpiExSystemWaitEvent ( 363 ACPI_OPERAND_OBJECT *TimeDesc, 364 ACPI_OPERAND_OBJECT *ObjDesc) 365 { 366 ACPI_STATUS Status = AE_OK; 367 368 369 ACPI_FUNCTION_TRACE (ExSystemWaitEvent); 370 371 372 if (ObjDesc) 373 { 374 Status = AcpiExSystemWaitSemaphore (ObjDesc->Event.OsSemaphore, 375 (UINT16) TimeDesc->Integer.Value); 376 } 377 378 return_ACPI_STATUS (Status); 379 } 380 381 382 /******************************************************************************* 383 * 384 * FUNCTION: AcpiExSystemResetEvent 385 * 386 * PARAMETERS: ObjDesc - The object descriptor for this op 387 * 388 * RETURN: Status 389 * 390 * DESCRIPTION: Reset an event to a known state. 391 * 392 ******************************************************************************/ 393 394 ACPI_STATUS 395 AcpiExSystemResetEvent ( 396 ACPI_OPERAND_OBJECT *ObjDesc) 397 { 398 ACPI_STATUS Status = AE_OK; 399 ACPI_SEMAPHORE TempSemaphore; 400 401 402 ACPI_FUNCTION_ENTRY (); 403 404 405 /* 406 * We are going to simply delete the existing semaphore and 407 * create a new one! 408 */ 409 Status = AcpiOsCreateSemaphore (ACPI_NO_UNIT_LIMIT, 0, &TempSemaphore); 410 if (ACPI_SUCCESS (Status)) 411 { 412 (void) AcpiOsDeleteSemaphore (ObjDesc->Event.OsSemaphore); 413 ObjDesc->Event.OsSemaphore = TempSemaphore; 414 } 415 416 return (Status); 417 } 418 419