exsystem.c revision 117521
1 2/****************************************************************************** 3 * 4 * Module Name: exsystem - Interface to OS services 5 * $Revision: 76 $ 6 * 7 *****************************************************************************/ 8 9/****************************************************************************** 10 * 11 * 1. Copyright Notice 12 * 13 * Some or all of this work - Copyright (c) 1999 - 2003, 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 * 193 * RETURN: Status 194 * 195 * DESCRIPTION: Suspend running thread for specified amount of time. 196 * 197 ******************************************************************************/ 198 199ACPI_STATUS 200AcpiExSystemDoStall ( 201 UINT32 HowLong) 202{ 203 ACPI_STATUS Status = AE_OK; 204 205 206 ACPI_FUNCTION_ENTRY (); 207 208 209 if (HowLong > 1000) /* 1 millisecond */ 210 { 211 /* Since this thread will sleep, we must release the interpreter */ 212 213 AcpiExExitInterpreter (); 214 215 AcpiOsSleep (0, (HowLong / 1000) + 1); 216 217 /* And now we must get the interpreter again */ 218 219 Status = AcpiExEnterInterpreter (); 220 } 221 222 else 223 { 224 AcpiOsStall (HowLong); 225 } 226 227 return (Status); 228} 229 230 231/******************************************************************************* 232 * 233 * FUNCTION: AcpiExSystemDoSuspend 234 * 235 * PARAMETERS: HowLong - The amount of time to suspend 236 * 237 * RETURN: None 238 * 239 * DESCRIPTION: Suspend running thread for specified amount of time. 240 * 241 ******************************************************************************/ 242 243ACPI_STATUS 244AcpiExSystemDoSuspend ( 245 UINT32 HowLong) 246{ 247 ACPI_STATUS Status; 248 249 250 ACPI_FUNCTION_ENTRY (); 251 252 253 /* Since this thread will sleep, we must release the interpreter */ 254 255 AcpiExExitInterpreter (); 256 257 AcpiOsSleep ((UINT16) (HowLong / (UINT32) 1000), 258 (UINT16) (HowLong % (UINT32) 1000)); 259 260 /* And now we must get the interpreter again */ 261 262 Status = AcpiExEnterInterpreter (); 263 return (Status); 264} 265 266 267/******************************************************************************* 268 * 269 * FUNCTION: AcpiExSystemAcquireMutex 270 * 271 * PARAMETERS: *TimeDesc - The 'time to delay' object descriptor 272 * *ObjDesc - The object descriptor for this op 273 * 274 * RETURN: Status 275 * 276 * DESCRIPTION: Provides an access point to perform synchronization operations 277 * within the AML. This function will cause a lock to be generated 278 * for the Mutex pointed to by ObjDesc. 279 * 280 ******************************************************************************/ 281 282ACPI_STATUS 283AcpiExSystemAcquireMutex ( 284 ACPI_OPERAND_OBJECT *TimeDesc, 285 ACPI_OPERAND_OBJECT *ObjDesc) 286{ 287 ACPI_STATUS Status = AE_OK; 288 289 290 ACPI_FUNCTION_TRACE_PTR ("ExSystemAcquireMutex", ObjDesc); 291 292 293 if (!ObjDesc) 294 { 295 return_ACPI_STATUS (AE_BAD_PARAMETER); 296 } 297 298 /* 299 * Support for the _GL_ Mutex object -- go get the global lock 300 */ 301 if (ObjDesc->Mutex.Semaphore == AcpiGbl_GlobalLockSemaphore) 302 { 303 Status = AcpiEvAcquireGlobalLock ((UINT16) TimeDesc->Integer.Value); 304 return_ACPI_STATUS (Status); 305 } 306 307 Status = AcpiExSystemWaitSemaphore (ObjDesc->Mutex.Semaphore, 308 (UINT16) TimeDesc->Integer.Value); 309 return_ACPI_STATUS (Status); 310} 311 312 313/******************************************************************************* 314 * 315 * FUNCTION: AcpiExSystemReleaseMutex 316 * 317 * PARAMETERS: *ObjDesc - The object descriptor for this op 318 * 319 * RETURN: Status 320 * 321 * DESCRIPTION: Provides an access point to perform synchronization operations 322 * within the AML. This operation is a request to release a 323 * previously acquired Mutex. If the Mutex variable is set then 324 * it will be decremented. 325 * 326 ******************************************************************************/ 327 328ACPI_STATUS 329AcpiExSystemReleaseMutex ( 330 ACPI_OPERAND_OBJECT *ObjDesc) 331{ 332 ACPI_STATUS Status = AE_OK; 333 334 335 ACPI_FUNCTION_TRACE ("ExSystemReleaseMutex"); 336 337 338 if (!ObjDesc) 339 { 340 return_ACPI_STATUS (AE_BAD_PARAMETER); 341 } 342 343 /* 344 * Support for the _GL_ Mutex object -- release the global lock 345 */ 346 if (ObjDesc->Mutex.Semaphore == AcpiGbl_GlobalLockSemaphore) 347 { 348 Status = AcpiEvReleaseGlobalLock (); 349 return_ACPI_STATUS (Status); 350 } 351 352 Status = AcpiOsSignalSemaphore (ObjDesc->Mutex.Semaphore, 1); 353 return_ACPI_STATUS (Status); 354} 355 356 357/******************************************************************************* 358 * 359 * FUNCTION: AcpiExSystemSignalEvent 360 * 361 * PARAMETERS: *ObjDesc - The object descriptor for this op 362 * 363 * RETURN: AE_OK 364 * 365 * DESCRIPTION: Provides an access point to perform synchronization operations 366 * within the AML. 367 * 368 ******************************************************************************/ 369 370ACPI_STATUS 371AcpiExSystemSignalEvent ( 372 ACPI_OPERAND_OBJECT *ObjDesc) 373{ 374 ACPI_STATUS Status = AE_OK; 375 376 377 ACPI_FUNCTION_TRACE ("ExSystemSignalEvent"); 378 379 380 if (ObjDesc) 381 { 382 Status = AcpiOsSignalSemaphore (ObjDesc->Event.Semaphore, 1); 383 } 384 385 return_ACPI_STATUS (Status); 386} 387 388 389/******************************************************************************* 390 * 391 * FUNCTION: AcpiExSystemWaitEvent 392 * 393 * PARAMETERS: *TimeDesc - The 'time to delay' object descriptor 394 * *ObjDesc - The object descriptor for this op 395 * 396 * RETURN: Status 397 * 398 * DESCRIPTION: Provides an access point to perform synchronization operations 399 * within the AML. This operation is a request to wait for an 400 * event. 401 * 402 ******************************************************************************/ 403 404ACPI_STATUS 405AcpiExSystemWaitEvent ( 406 ACPI_OPERAND_OBJECT *TimeDesc, 407 ACPI_OPERAND_OBJECT *ObjDesc) 408{ 409 ACPI_STATUS Status = AE_OK; 410 411 412 ACPI_FUNCTION_TRACE ("ExSystemWaitEvent"); 413 414 415 if (ObjDesc) 416 { 417 Status = AcpiExSystemWaitSemaphore (ObjDesc->Event.Semaphore, 418 (UINT16) TimeDesc->Integer.Value); 419 } 420 421 return_ACPI_STATUS (Status); 422} 423 424 425/******************************************************************************* 426 * 427 * FUNCTION: AcpiExSystemResetEvent 428 * 429 * PARAMETERS: *ObjDesc - The object descriptor for this op 430 * 431 * RETURN: Status 432 * 433 * DESCRIPTION: Reset an event to a known state. 434 * 435 ******************************************************************************/ 436 437ACPI_STATUS 438AcpiExSystemResetEvent ( 439 ACPI_OPERAND_OBJECT *ObjDesc) 440{ 441 ACPI_STATUS Status = AE_OK; 442 void *TempSemaphore; 443 444 445 ACPI_FUNCTION_ENTRY (); 446 447 448 /* 449 * We are going to simply delete the existing semaphore and 450 * create a new one! 451 */ 452 Status = AcpiOsCreateSemaphore (ACPI_NO_UNIT_LIMIT, 0, &TempSemaphore); 453 if (ACPI_SUCCESS (Status)) 454 { 455 (void) AcpiOsDeleteSemaphore (ObjDesc->Event.Semaphore); 456 ObjDesc->Event.Semaphore = TempSemaphore; 457 } 458 459 return (Status); 460} 461 462