exsystem.c revision 138287
1 2/****************************************************************************** 3 * 4 * Module Name: exsystem - Interface to OS services 5 * $Revision: 81 $ 6 * 7 *****************************************************************************/ 8 9/****************************************************************************** 10 * 11 * 1. Copyright Notice 12 * 13 * Some or all of this work - Copyright (c) 1999 - 2004, 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#include "acevents.h" 123 124#define _COMPONENT ACPI_EXECUTER 125 ACPI_MODULE_NAME ("exsystem") 126 127 128/******************************************************************************* 129 * 130 * FUNCTION: AcpiExSystemWaitSemaphore 131 * 132 * PARAMETERS: Semaphore - OSD semaphore to wait on 133 * Timeout - Max time to wait 134 * 135 * RETURN: Status 136 * 137 * DESCRIPTION: Implements a semaphore wait with a check to see if the 138 * semaphore is available immediately. If it is not, the 139 * interpreter is released. 140 * 141 ******************************************************************************/ 142 143ACPI_STATUS 144AcpiExSystemWaitSemaphore ( 145 ACPI_HANDLE Semaphore, 146 UINT16 Timeout) 147{ 148 ACPI_STATUS Status; 149 ACPI_STATUS Status2; 150 151 152 ACPI_FUNCTION_TRACE ("ExSystemWaitSemaphore"); 153 154 155 Status = AcpiOsWaitSemaphore (Semaphore, 1, 0); 156 if (ACPI_SUCCESS (Status)) 157 { 158 return_ACPI_STATUS (Status); 159 } 160 161 if (Status == AE_TIME) 162 { 163 /* We must wait, so unlock the interpreter */ 164 165 AcpiExExitInterpreter (); 166 167 Status = AcpiOsWaitSemaphore (Semaphore, 1, Timeout); 168 169 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "*** Thread awake after blocking, %s\n", 170 AcpiFormatException (Status))); 171 172 /* Reacquire the interpreter */ 173 174 Status2 = AcpiExEnterInterpreter (); 175 if (ACPI_FAILURE (Status2)) 176 { 177 /* Report fatal error, could not acquire interpreter */ 178 179 return_ACPI_STATUS (Status2); 180 } 181 } 182 183 return_ACPI_STATUS (Status); 184} 185 186 187/******************************************************************************* 188 * 189 * FUNCTION: AcpiExSystemDoStall 190 * 191 * PARAMETERS: HowLong - The amount of time to stall, 192 * in microseconds 193 * 194 * RETURN: Status 195 * 196 * DESCRIPTION: Suspend running thread for specified amount of time. 197 * Note: ACPI specification requires that Stall() does not 198 * relinquish the processor, and delays longer than 100 usec 199 * should use Sleep() instead. We allow stalls up to 255 usec 200 * for compatibility with other interpreters and existing BIOSs. 201 * 202 ******************************************************************************/ 203 204ACPI_STATUS 205AcpiExSystemDoStall ( 206 UINT32 HowLong) 207{ 208 ACPI_STATUS Status = AE_OK; 209 210 211 ACPI_FUNCTION_ENTRY (); 212 213 214 if (HowLong > 255) /* 255 microseconds */ 215 { 216 /* 217 * Longer than 255 usec, this is an error 218 * 219 * (ACPI specifies 100 usec as max, but this gives some slack in 220 * order to support existing BIOSs) 221 */ 222 ACPI_REPORT_ERROR (("Stall: Time parameter is too large (%d)\n", HowLong)); 223 Status = AE_AML_OPERAND_VALUE; 224 } 225 else 226 { 227 AcpiOsStall (HowLong); 228 } 229 230 return (Status); 231} 232 233 234/******************************************************************************* 235 * 236 * FUNCTION: AcpiExSystemDoSuspend 237 * 238 * PARAMETERS: HowLong - The amount of time to suspend, 239 * in milliseconds 240 * 241 * RETURN: None 242 * 243 * DESCRIPTION: Suspend running thread for specified amount of time. 244 * 245 ******************************************************************************/ 246 247ACPI_STATUS 248AcpiExSystemDoSuspend ( 249 ACPI_INTEGER HowLong) 250{ 251 ACPI_STATUS Status; 252 253 254 ACPI_FUNCTION_ENTRY (); 255 256 257 /* Since this thread will sleep, we must release the interpreter */ 258 259 AcpiExExitInterpreter (); 260 261 AcpiOsSleep (HowLong); 262 263 /* And now we must get the interpreter again */ 264 265 Status = AcpiExEnterInterpreter (); 266 return (Status); 267} 268 269 270/******************************************************************************* 271 * 272 * FUNCTION: AcpiExSystemAcquireMutex 273 * 274 * PARAMETERS: *TimeDesc - The 'time to delay' object descriptor 275 * *ObjDesc - The object descriptor for this op 276 * 277 * RETURN: Status 278 * 279 * DESCRIPTION: Provides an access point to perform synchronization operations 280 * within the AML. This function will cause a lock to be generated 281 * for the Mutex pointed to by ObjDesc. 282 * 283 ******************************************************************************/ 284 285ACPI_STATUS 286AcpiExSystemAcquireMutex ( 287 ACPI_OPERAND_OBJECT *TimeDesc, 288 ACPI_OPERAND_OBJECT *ObjDesc) 289{ 290 ACPI_STATUS Status = AE_OK; 291 292 293 ACPI_FUNCTION_TRACE_PTR ("ExSystemAcquireMutex", ObjDesc); 294 295 296 if (!ObjDesc) 297 { 298 return_ACPI_STATUS (AE_BAD_PARAMETER); 299 } 300 301 /* 302 * Support for the _GL_ Mutex object -- go get the global lock 303 */ 304 if (ObjDesc->Mutex.Semaphore == AcpiGbl_GlobalLockSemaphore) 305 { 306 Status = AcpiEvAcquireGlobalLock ((UINT16) TimeDesc->Integer.Value); 307 return_ACPI_STATUS (Status); 308 } 309 310 Status = AcpiExSystemWaitSemaphore (ObjDesc->Mutex.Semaphore, 311 (UINT16) TimeDesc->Integer.Value); 312 return_ACPI_STATUS (Status); 313} 314 315 316/******************************************************************************* 317 * 318 * FUNCTION: AcpiExSystemReleaseMutex 319 * 320 * PARAMETERS: *ObjDesc - The object descriptor for this op 321 * 322 * RETURN: Status 323 * 324 * DESCRIPTION: Provides an access point to perform synchronization operations 325 * within the AML. This operation is a request to release a 326 * previously acquired Mutex. If the Mutex variable is set then 327 * it will be decremented. 328 * 329 ******************************************************************************/ 330 331ACPI_STATUS 332AcpiExSystemReleaseMutex ( 333 ACPI_OPERAND_OBJECT *ObjDesc) 334{ 335 ACPI_STATUS Status = AE_OK; 336 337 338 ACPI_FUNCTION_TRACE ("ExSystemReleaseMutex"); 339 340 341 if (!ObjDesc) 342 { 343 return_ACPI_STATUS (AE_BAD_PARAMETER); 344 } 345 346 /* 347 * Support for the _GL_ Mutex object -- release the global lock 348 */ 349 if (ObjDesc->Mutex.Semaphore == AcpiGbl_GlobalLockSemaphore) 350 { 351 Status = AcpiEvReleaseGlobalLock (); 352 return_ACPI_STATUS (Status); 353 } 354 355 Status = AcpiOsSignalSemaphore (ObjDesc->Mutex.Semaphore, 1); 356 return_ACPI_STATUS (Status); 357} 358 359 360/******************************************************************************* 361 * 362 * FUNCTION: AcpiExSystemSignalEvent 363 * 364 * PARAMETERS: *ObjDesc - The object descriptor for this op 365 * 366 * RETURN: AE_OK 367 * 368 * DESCRIPTION: Provides an access point to perform synchronization operations 369 * within the AML. 370 * 371 ******************************************************************************/ 372 373ACPI_STATUS 374AcpiExSystemSignalEvent ( 375 ACPI_OPERAND_OBJECT *ObjDesc) 376{ 377 ACPI_STATUS Status = AE_OK; 378 379 380 ACPI_FUNCTION_TRACE ("ExSystemSignalEvent"); 381 382 383 if (ObjDesc) 384 { 385 Status = AcpiOsSignalSemaphore (ObjDesc->Event.Semaphore, 1); 386 } 387 388 return_ACPI_STATUS (Status); 389} 390 391 392/******************************************************************************* 393 * 394 * FUNCTION: AcpiExSystemWaitEvent 395 * 396 * PARAMETERS: *TimeDesc - The 'time to delay' object descriptor 397 * *ObjDesc - The object descriptor for this op 398 * 399 * RETURN: Status 400 * 401 * DESCRIPTION: Provides an access point to perform synchronization operations 402 * within the AML. This operation is a request to wait for an 403 * event. 404 * 405 ******************************************************************************/ 406 407ACPI_STATUS 408AcpiExSystemWaitEvent ( 409 ACPI_OPERAND_OBJECT *TimeDesc, 410 ACPI_OPERAND_OBJECT *ObjDesc) 411{ 412 ACPI_STATUS Status = AE_OK; 413 414 415 ACPI_FUNCTION_TRACE ("ExSystemWaitEvent"); 416 417 418 if (ObjDesc) 419 { 420 Status = AcpiExSystemWaitSemaphore (ObjDesc->Event.Semaphore, 421 (UINT16) TimeDesc->Integer.Value); 422 } 423 424 return_ACPI_STATUS (Status); 425} 426 427 428/******************************************************************************* 429 * 430 * FUNCTION: AcpiExSystemResetEvent 431 * 432 * PARAMETERS: *ObjDesc - The object descriptor for this op 433 * 434 * RETURN: Status 435 * 436 * DESCRIPTION: Reset an event to a known state. 437 * 438 ******************************************************************************/ 439 440ACPI_STATUS 441AcpiExSystemResetEvent ( 442 ACPI_OPERAND_OBJECT *ObjDesc) 443{ 444 ACPI_STATUS Status = AE_OK; 445 void *TempSemaphore; 446 447 448 ACPI_FUNCTION_ENTRY (); 449 450 451 /* 452 * We are going to simply delete the existing semaphore and 453 * create a new one! 454 */ 455 Status = AcpiOsCreateSemaphore (ACPI_NO_UNIT_LIMIT, 0, &TempSemaphore); 456 if (ACPI_SUCCESS (Status)) 457 { 458 (void) AcpiOsDeleteSemaphore (ObjDesc->Event.Semaphore); 459 ObjDesc->Event.Semaphore = TempSemaphore; 460 } 461 462 return (Status); 463} 464 465