exsystem.c revision 77424
1 2/****************************************************************************** 3 * 4 * Module Name: exsystem - Interface to OS services 5 * $Revision: 62 $ 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 ("AcpiExSystemWaitSemaphore"); 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 DEBUG_PRINT (TRACE_EXEC, ("*** Thread awake after blocking, %s\n", 170 AcpiUtFormatException (Status))); 171 172 /* Reacquire the interpreter */ 173 174 Status = AcpiExEnterInterpreter (); 175 if (ACPI_SUCCESS (Status)) 176 { 177 /* Restore the timeout exception */ 178 179 Status = AE_TIME; 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: None 194 * 195 * DESCRIPTION: Suspend running thread for specified amount of time. 196 * 197 ******************************************************************************/ 198 199void 200AcpiExSystemDoStall ( 201 UINT32 HowLong) 202{ 203 204 if (HowLong > 1000) /* 1 millisecond */ 205 { 206 /* Since this thread will sleep, we must release the interpreter */ 207 208 AcpiExExitInterpreter (); 209 210 AcpiOsSleepUsec (HowLong); 211 212 /* And now we must get the interpreter again */ 213 214 AcpiExEnterInterpreter (); 215 } 216 217 else 218 { 219 AcpiOsSleepUsec (HowLong); 220 } 221} 222 223 224/******************************************************************************* 225 * 226 * FUNCTION: AcpiExSystemDoSuspend 227 * 228 * PARAMETERS: HowLong - The amount of time to suspend 229 * 230 * RETURN: None 231 * 232 * DESCRIPTION: Suspend running thread for specified amount of time. 233 * 234 ******************************************************************************/ 235 236void 237AcpiExSystemDoSuspend ( 238 UINT32 HowLong) 239{ 240 /* Since this thread will sleep, we must release the interpreter */ 241 242 AcpiExExitInterpreter (); 243 244 AcpiOsSleep ((UINT16) (HowLong / (UINT32) 1000), 245 (UINT16) (HowLong % (UINT32) 1000)); 246 247 /* And now we must get the interpreter again */ 248 249 AcpiExEnterInterpreter (); 250} 251 252 253/******************************************************************************* 254 * 255 * FUNCTION: AcpiExSystemAcquireMutex 256 * 257 * PARAMETERS: *TimeDesc - The 'time to delay' object descriptor 258 * *ObjDesc - The object descriptor for this op 259 * 260 * RETURN: Status 261 * 262 * DESCRIPTION: Provides an access point to perform synchronization operations 263 * within the AML. This function will cause a lock to be generated 264 * for the Mutex pointed to by ObjDesc. 265 * 266 ******************************************************************************/ 267 268ACPI_STATUS 269AcpiExSystemAcquireMutex ( 270 ACPI_OPERAND_OBJECT *TimeDesc, 271 ACPI_OPERAND_OBJECT *ObjDesc) 272{ 273 ACPI_STATUS Status = AE_OK; 274 275 276 FUNCTION_TRACE_PTR ("AcpiExSystemAcquireMutex", ObjDesc); 277 278 if (!ObjDesc) 279 { 280 return_ACPI_STATUS (AE_BAD_PARAMETER); 281 } 282 283 /* 284 * Support for the _GL_ Mutex object -- go get the global lock 285 */ 286 287 if (ObjDesc->Mutex.Semaphore == AcpiGbl_GlobalLockSemaphore) 288 { 289 Status = AcpiEvAcquireGlobalLock (); 290 return_ACPI_STATUS (Status); 291 } 292 293 Status = AcpiExSystemWaitSemaphore (ObjDesc->Mutex.Semaphore, 294 (UINT32) TimeDesc->Integer.Value); 295 return_ACPI_STATUS (Status); 296} 297 298 299/******************************************************************************* 300 * 301 * FUNCTION: AcpiExSystemReleaseMutex 302 * 303 * PARAMETERS: *ObjDesc - The object descriptor for this op 304 * 305 * RETURN: Status 306 * 307 * DESCRIPTION: Provides an access point to perform synchronization operations 308 * within the AML. This operation is a request to release a 309 * previously acquired Mutex. If the Mutex variable is set then 310 * it will be decremented. 311 * 312 ******************************************************************************/ 313 314ACPI_STATUS 315AcpiExSystemReleaseMutex ( 316 ACPI_OPERAND_OBJECT *ObjDesc) 317{ 318 ACPI_STATUS Status = AE_OK; 319 320 321 FUNCTION_TRACE ("AcpiExSystemReleaseMutex"); 322 323 324 if (!ObjDesc) 325 { 326 return_ACPI_STATUS (AE_BAD_PARAMETER); 327 } 328 329 /* 330 * Support for the _GL_ Mutex object -- release the global lock 331 */ 332 if (ObjDesc->Mutex.Semaphore == AcpiGbl_GlobalLockSemaphore) 333 { 334 AcpiEvReleaseGlobalLock (); 335 return_ACPI_STATUS (AE_OK); 336 } 337 338 Status = AcpiOsSignalSemaphore (ObjDesc->Mutex.Semaphore, 1); 339 return_ACPI_STATUS (Status); 340} 341 342 343/******************************************************************************* 344 * 345 * FUNCTION: AcpiExSystemSignalEvent 346 * 347 * PARAMETERS: *ObjDesc - The object descriptor for this op 348 * 349 * RETURN: AE_OK 350 * 351 * DESCRIPTION: Provides an access point to perform synchronization operations 352 * within the AML. 353 * 354 ******************************************************************************/ 355 356ACPI_STATUS 357AcpiExSystemSignalEvent ( 358 ACPI_OPERAND_OBJECT *ObjDesc) 359{ 360 ACPI_STATUS Status = AE_OK; 361 362 363 FUNCTION_TRACE ("AcpiExSystemSignalEvent"); 364 365 366 if (ObjDesc) 367 { 368 Status = AcpiOsSignalSemaphore (ObjDesc->Event.Semaphore, 1); 369 } 370 371 return_ACPI_STATUS (Status); 372} 373 374 375/******************************************************************************* 376 * 377 * FUNCTION: AcpiExSystemWaitEvent 378 * 379 * PARAMETERS: *TimeDesc - The 'time to delay' object descriptor 380 * *ObjDesc - The object descriptor for this op 381 * 382 * RETURN: Status 383 * 384 * DESCRIPTION: Provides an access point to perform synchronization operations 385 * within the AML. This operation is a request to wait for an 386 * event. 387 * 388 ******************************************************************************/ 389 390ACPI_STATUS 391AcpiExSystemWaitEvent ( 392 ACPI_OPERAND_OBJECT *TimeDesc, 393 ACPI_OPERAND_OBJECT *ObjDesc) 394{ 395 ACPI_STATUS Status = AE_OK; 396 397 398 FUNCTION_TRACE ("AcpiExSystemWaitEvent"); 399 400 401 if (ObjDesc) 402 { 403 Status = AcpiExSystemWaitSemaphore (ObjDesc->Event.Semaphore, 404 (UINT32) TimeDesc->Integer.Value); 405 } 406 407 408 return_ACPI_STATUS (Status); 409} 410 411 412/******************************************************************************* 413 * 414 * FUNCTION: AcpiExSystemResetEvent 415 * 416 * PARAMETERS: *ObjDesc - The object descriptor for this op 417 * 418 * RETURN: Status 419 * 420 * DESCRIPTION: Reset an event to a known state. 421 * 422 ******************************************************************************/ 423 424ACPI_STATUS 425AcpiExSystemResetEvent ( 426 ACPI_OPERAND_OBJECT *ObjDesc) 427{ 428 ACPI_STATUS Status = AE_OK; 429 void *TempSemaphore; 430 431 432 /* 433 * We are going to simply delete the existing semaphore and 434 * create a new one! 435 */ 436 437 Status = AcpiOsCreateSemaphore (ACPI_NO_UNIT_LIMIT, 0, &TempSemaphore); 438 if (ACPI_SUCCESS (Status)) 439 { 440 AcpiOsDeleteSemaphore (ObjDesc->Event.Semaphore); 441 ObjDesc->Event.Semaphore = TempSemaphore; 442 } 443 444 return (Status); 445} 446 447