exsystem.c revision 83174
1 2/****************************************************************************** 3 * 4 * Module Name: exsystem - Interface to OS services 5 * $Revision: 67 $ 6 * 7 *****************************************************************************/ 8 9/****************************************************************************** 10 * 11 * 1. Copyright Notice 12 * 13 * Some or all of this work - Copyright (c) 1999, 2000, 2001, 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 "acnamesp.h" 123#include "achware.h" 124#include "acevents.h" 125 126#define _COMPONENT ACPI_EXECUTER 127 MODULE_NAME ("exsystem") 128 129 130/******************************************************************************* 131 * 132 * FUNCTION: AcpiExSystemWaitSemaphore 133 * 134 * PARAMETERS: Semaphore - OSD semaphore to wait on 135 * Timeout - Max time to wait 136 * 137 * RETURN: Status 138 * 139 * DESCRIPTION: Implements a semaphore wait with a check to see if the 140 * semaphore is available immediately. If it is not, the 141 * interpreter is released. 142 * 143 ******************************************************************************/ 144 145ACPI_STATUS 146AcpiExSystemWaitSemaphore ( 147 ACPI_HANDLE Semaphore, 148 UINT32 Timeout) 149{ 150 ACPI_STATUS Status; 151 152 153 FUNCTION_TRACE ("ExSystemWaitSemaphore"); 154 155 156 Status = AcpiOsWaitSemaphore (Semaphore, 1, 0); 157 if (ACPI_SUCCESS (Status)) 158 { 159 return_ACPI_STATUS (Status); 160 } 161 162 if (Status == AE_TIME) 163 { 164 /* We must wait, so unlock the interpreter */ 165 166 AcpiExExitInterpreter (); 167 168 Status = AcpiOsWaitSemaphore (Semaphore, 1, Timeout); 169 170 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "*** Thread awake after blocking, %s\n", 171 AcpiFormatException (Status))); 172 173 /* Reacquire the interpreter */ 174 175 Status = AcpiExEnterInterpreter (); 176 if (ACPI_SUCCESS (Status)) 177 { 178 /* Restore the timeout exception */ 179 180 Status = AE_TIME; 181 } 182 } 183 184 return_ACPI_STATUS (Status); 185} 186 187 188/******************************************************************************* 189 * 190 * FUNCTION: AcpiExSystemDoStall 191 * 192 * PARAMETERS: HowLong - The amount of time to stall 193 * 194 * RETURN: None 195 * 196 * DESCRIPTION: Suspend running thread for specified amount of time. 197 * 198 ******************************************************************************/ 199 200void 201AcpiExSystemDoStall ( 202 UINT32 HowLong) 203{ 204 FUNCTION_ENTRY (); 205 206 207 if (HowLong > 1000) /* 1 millisecond */ 208 { 209 /* Since this thread will sleep, we must release the interpreter */ 210 211 AcpiExExitInterpreter (); 212 213 AcpiOsStall (HowLong); 214 215 /* And now we must get the interpreter again */ 216 217 AcpiExEnterInterpreter (); 218 } 219 220 else 221 { 222 AcpiOsSleep (0, (HowLong / 1000) + 1); 223 } 224} 225 226 227/******************************************************************************* 228 * 229 * FUNCTION: AcpiExSystemDoSuspend 230 * 231 * PARAMETERS: HowLong - The amount of time to suspend 232 * 233 * RETURN: None 234 * 235 * DESCRIPTION: Suspend running thread for specified amount of time. 236 * 237 ******************************************************************************/ 238 239void 240AcpiExSystemDoSuspend ( 241 UINT32 HowLong) 242{ 243 244 FUNCTION_ENTRY (); 245 246 247 /* Since this thread will sleep, we must release the interpreter */ 248 249 AcpiExExitInterpreter (); 250 251 AcpiOsSleep ((UINT16) (HowLong / (UINT32) 1000), 252 (UINT16) (HowLong % (UINT32) 1000)); 253 254 /* And now we must get the interpreter again */ 255 256 AcpiExEnterInterpreter (); 257} 258 259 260/******************************************************************************* 261 * 262 * FUNCTION: AcpiExSystemAcquireMutex 263 * 264 * PARAMETERS: *TimeDesc - The 'time to delay' object descriptor 265 * *ObjDesc - The object descriptor for this op 266 * 267 * RETURN: Status 268 * 269 * DESCRIPTION: Provides an access point to perform synchronization operations 270 * within the AML. This function will cause a lock to be generated 271 * for the Mutex pointed to by ObjDesc. 272 * 273 ******************************************************************************/ 274 275ACPI_STATUS 276AcpiExSystemAcquireMutex ( 277 ACPI_OPERAND_OBJECT *TimeDesc, 278 ACPI_OPERAND_OBJECT *ObjDesc) 279{ 280 ACPI_STATUS Status = AE_OK; 281 282 283 FUNCTION_TRACE_PTR ("ExSystemAcquireMutex", ObjDesc); 284 285 286 if (!ObjDesc) 287 { 288 return_ACPI_STATUS (AE_BAD_PARAMETER); 289 } 290 291 /* 292 * Support for the _GL_ Mutex object -- go get the global lock 293 */ 294 if (ObjDesc->Mutex.Semaphore == AcpiGbl_GlobalLockSemaphore) 295 { 296 Status = AcpiEvAcquireGlobalLock (); 297 return_ACPI_STATUS (Status); 298 } 299 300 Status = AcpiExSystemWaitSemaphore (ObjDesc->Mutex.Semaphore, 301 (UINT32) TimeDesc->Integer.Value); 302 return_ACPI_STATUS (Status); 303} 304 305 306/******************************************************************************* 307 * 308 * FUNCTION: AcpiExSystemReleaseMutex 309 * 310 * PARAMETERS: *ObjDesc - The object descriptor for this op 311 * 312 * RETURN: Status 313 * 314 * DESCRIPTION: Provides an access point to perform synchronization operations 315 * within the AML. This operation is a request to release a 316 * previously acquired Mutex. If the Mutex variable is set then 317 * it will be decremented. 318 * 319 ******************************************************************************/ 320 321ACPI_STATUS 322AcpiExSystemReleaseMutex ( 323 ACPI_OPERAND_OBJECT *ObjDesc) 324{ 325 ACPI_STATUS Status = AE_OK; 326 327 328 FUNCTION_TRACE ("ExSystemReleaseMutex"); 329 330 331 if (!ObjDesc) 332 { 333 return_ACPI_STATUS (AE_BAD_PARAMETER); 334 } 335 336 /* 337 * Support for the _GL_ Mutex object -- release the global lock 338 */ 339 if (ObjDesc->Mutex.Semaphore == AcpiGbl_GlobalLockSemaphore) 340 { 341 AcpiEvReleaseGlobalLock (); 342 return_ACPI_STATUS (AE_OK); 343 } 344 345 Status = AcpiOsSignalSemaphore (ObjDesc->Mutex.Semaphore, 1); 346 return_ACPI_STATUS (Status); 347} 348 349 350/******************************************************************************* 351 * 352 * FUNCTION: AcpiExSystemSignalEvent 353 * 354 * PARAMETERS: *ObjDesc - The object descriptor for this op 355 * 356 * RETURN: AE_OK 357 * 358 * DESCRIPTION: Provides an access point to perform synchronization operations 359 * within the AML. 360 * 361 ******************************************************************************/ 362 363ACPI_STATUS 364AcpiExSystemSignalEvent ( 365 ACPI_OPERAND_OBJECT *ObjDesc) 366{ 367 ACPI_STATUS Status = AE_OK; 368 369 370 FUNCTION_TRACE ("ExSystemSignalEvent"); 371 372 373 if (ObjDesc) 374 { 375 Status = AcpiOsSignalSemaphore (ObjDesc->Event.Semaphore, 1); 376 } 377 378 return_ACPI_STATUS (Status); 379} 380 381 382/******************************************************************************* 383 * 384 * FUNCTION: AcpiExSystemWaitEvent 385 * 386 * PARAMETERS: *TimeDesc - The 'time to delay' object descriptor 387 * *ObjDesc - The object descriptor for this op 388 * 389 * RETURN: Status 390 * 391 * DESCRIPTION: Provides an access point to perform synchronization operations 392 * within the AML. This operation is a request to wait for an 393 * event. 394 * 395 ******************************************************************************/ 396 397ACPI_STATUS 398AcpiExSystemWaitEvent ( 399 ACPI_OPERAND_OBJECT *TimeDesc, 400 ACPI_OPERAND_OBJECT *ObjDesc) 401{ 402 ACPI_STATUS Status = AE_OK; 403 404 405 FUNCTION_TRACE ("ExSystemWaitEvent"); 406 407 408 if (ObjDesc) 409 { 410 Status = AcpiExSystemWaitSemaphore (ObjDesc->Event.Semaphore, 411 (UINT32) TimeDesc->Integer.Value); 412 } 413 414 415 return_ACPI_STATUS (Status); 416} 417 418 419/******************************************************************************* 420 * 421 * FUNCTION: AcpiExSystemResetEvent 422 * 423 * PARAMETERS: *ObjDesc - The object descriptor for this op 424 * 425 * RETURN: Status 426 * 427 * DESCRIPTION: Reset an event to a known state. 428 * 429 ******************************************************************************/ 430 431ACPI_STATUS 432AcpiExSystemResetEvent ( 433 ACPI_OPERAND_OBJECT *ObjDesc) 434{ 435 ACPI_STATUS Status = AE_OK; 436 void *TempSemaphore; 437 438 439 FUNCTION_ENTRY (); 440 441 442 /* 443 * We are going to simply delete the existing semaphore and 444 * create a new one! 445 */ 446 Status = AcpiOsCreateSemaphore (ACPI_NO_UNIT_LIMIT, 0, &TempSemaphore); 447 if (ACPI_SUCCESS (Status)) 448 { 449 AcpiOsDeleteSemaphore (ObjDesc->Event.Semaphore); 450 ObjDesc->Event.Semaphore = TempSemaphore; 451 } 452 453 return (Status); 454} 455 456