drivers/acpi/executer/exsystem.c

   1
   2 /******************************************************************************
   3  *
   4  * Module Name: exsystem - Interface to OS services
   5  *
   6  *****************************************************************************/
   7
   8 /******************************************************************************
   9  *
  10  * 1. Copyright Notice
  11  *
  12  * Some or all of this work - Copyright (c) 1999 - 2010, Intel Corp.
  13  * All rights reserved.
  14  *
  15  * 2. License
  16  *
  17  * 2.1. This is your license from Intel Corp. under its intellectual property
  18  * rights.  You may have additional license terms from the party that provided
  19  * you this software, covering your right to use that party's intellectual
  20  * property rights.
  21  *
  22  * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
  23  * copy of the source code appearing in this file ("Covered Code") an
  24  * irrevocable, perpetual, worldwide license under Intel's copyrights in the
  25  * base code distributed originally by Intel ("Original Intel Code") to copy,
  26  * make derivatives, distribute, use and display any portion of the Covered
  27  * Code in any form, with the right to sublicense such rights; and
  28  *
  29  * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
  30  * license (with the right to sublicense), under only those claims of Intel
  31  * patents that are infringed by the Original Intel Code, to make, use, sell,
  32  * offer to sell, and import the Covered Code and derivative works thereof
  33  * solely to the minimum extent necessary to exercise the above copyright
  34  * license, and in no event shall the patent license extend to any additions
  35  * to or modifications of the Original Intel Code.  No other license or right
  36  * is granted directly or by implication, estoppel or otherwise;
  37  *
  38  * The above copyright and patent license is granted only if the following
  39  * conditions are met:
  40  *
  41  * 3. Conditions
  42  *
  43  * 3.1. Redistribution of Source with Rights to Further Distribute Source.
  44  * Redistribution of source code of any substantial portion of the Covered
  45  * Code or modification with rights to further distribute source must include
  46  * the above Copyright Notice, the above License, this list of Conditions,
  47  * and the following Disclaimer and Export Compliance provision.  In addition,
  48  * Licensee must cause all Covered Code to which Licensee contributes to
  49  * contain a file documenting the changes Licensee made to create that Covered
  50  * Code and the date of any change.  Licensee must include in that file the
  51  * documentation of any changes made by any predecessor Licensee.  Licensee
  52  * must include a prominent statement that the modification is derived,
  53  * directly or indirectly, from Original Intel Code.
  54  *
  55  * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
  56  * Redistribution of source code of any substantial portion of the Covered
  57  * Code or modification without rights to further distribute source must
  58  * include the following Disclaimer and Export Compliance provision in the
  59  * documentation and/or other materials provided with distribution.  In
  60  * addition, Licensee may not authorize further sublicense of source of any
  61  * portion of the Covered Code, and must include terms to the effect that the
  62  * license from Licensee to its licensee is limited to the intellectual
  63  * property embodied in the software Licensee provides to its licensee, and
  64  * not to intellectual property embodied in modifications its licensee may
  65  * make.
  66  *
  67  * 3.3. Redistribution of Executable. Redistribution in executable form of any
  68  * substantial portion of the Covered Code or modification must reproduce the
  69  * above Copyright Notice, and the following Disclaimer and Export Compliance
  70  * provision in the documentation and/or other materials provided with the
  71  * distribution.
  72  *
  73  * 3.4. Intel retains all right, title, and interest in and to the Original
  74  * Intel Code.
  75  *
  76  * 3.5. Neither the name Intel nor any other trademark owned or controlled by
  77  * Intel shall be used in advertising or otherwise to promote the sale, use or
  78  * other dealings in products derived from or relating to the Covered Code
  79  * without prior written authorization from Intel.
  80  *
  81  * 4. Disclaimer and Export Compliance
  82  *
  83  * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
  84  * HERE.  ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
  85  * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT,  ASSISTANCE,
  86  * INSTALLATION, TRAINING OR OTHER SERVICES.  INTEL WILL NOT PROVIDE ANY
  87  * UPDATES, ENHANCEMENTS OR EXTENSIONS.  INTEL SPECIFICALLY DISCLAIMS ANY
  88  * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
  89  * PARTICULAR PURPOSE.
  90  *
  91  * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
  92  * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
  93  * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
  94  * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
  95  * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
  96  * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.  THESE LIMITATIONS
  97  * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
  98  * LIMITED REMEDY.
  99  *
 100  * 4.3. Licensee shall not export, either directly or indirectly, any of this
 101  * software or system incorporating such software without first obtaining any
 102  * required license or other approval from the U. S. Department of Commerce or
 103  * any other agency or department of the United States Government.  In the
 104  * event Licensee exports any such software from the United States or
 105  * re-exports any such software from a foreign destination, Licensee shall
 106  * ensure that the distribution and export/re-export of the software is in
 107  * compliance with all laws, regulations, orders, or other restrictions of the
 108  * U.S. Export Administration Regulations. Licensee agrees that neither it nor
 109  * any of its subsidiaries will export/re-export any technical data, process,
 110  * software, or service, directly or indirectly, to any country for which the
 111  * United States government or any agency thereof requires an export license,
 112  * other governmental approval, or letter of assurance, without first obtaining
 113  * such license, approval or letter.
 114  *
 115  *****************************************************************************/
 116
 117 #define __EXSYSTEM_C__
 118
 119 #include "acpi.h"
 120 #include "accommon.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 (%u)",
 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:    AcpiExSystemDoSleep
 284  *
 285  * PARAMETERS:  HowLong         - The amount of time to sleep,
 286  *                                in milliseconds
 287  *
 288  * RETURN:      None
 289  *
 290  * DESCRIPTION: Sleep the running thread for specified amount of time.
 291  *
 292  ******************************************************************************/
 293
 294 ACPI_STATUS
 295 AcpiExSystemDoSleep (
 296     UINT64                  HowLong)
 297 {
 298     ACPI_FUNCTION_ENTRY ();
 299
 300
 301     /* Since this thread will sleep, we must release the interpreter */
 302
 303     AcpiExRelinquishInterpreter ();
 304
 305     /*
 306      * For compatibility with other ACPI implementations and to prevent
 307      * accidental deep sleeps, limit the sleep time to something reasonable.
 308      */
 309     if (HowLong > ACPI_MAX_SLEEP)
 310     {
 311         HowLong = ACPI_MAX_SLEEP;
 312     }
 313
 314     AcpiOsSleep (HowLong);
 315
 316     /* And now we must get the interpreter again */
 317
 318     AcpiExReacquireInterpreter ();
 319     return (AE_OK);
 320 }
 321
 322
 323 /*******************************************************************************
 324  *
 325  * FUNCTION:    AcpiExSystemSignalEvent
 326  *
 327  * PARAMETERS:  ObjDesc         - The object descriptor for this op
 328  *
 329  * RETURN:      Status
 330  *
 331  * DESCRIPTION: Provides an access point to perform synchronization operations
 332  *              within the AML.
 333  *
 334  ******************************************************************************/
 335
 336 ACPI_STATUS
 337 AcpiExSystemSignalEvent (
 338     ACPI_OPERAND_OBJECT     *ObjDesc)
 339 {
 340     ACPI_STATUS             Status = AE_OK;
 341
 342
 343     ACPI_FUNCTION_TRACE (ExSystemSignalEvent);
 344
 345
 346     if (ObjDesc)
 347     {
 348         Status = AcpiOsSignalSemaphore (ObjDesc->Event.OsSemaphore, 1);
 349     }
 350
 351     return_ACPI_STATUS (Status);
 352 }
 353
 354
 355 /*******************************************************************************
 356  *
 357  * FUNCTION:    AcpiExSystemWaitEvent
 358  *
 359  * PARAMETERS:  TimeDesc        - The 'time to delay' object descriptor
 360  *              ObjDesc         - The object descriptor for this op
 361  *
 362  * RETURN:      Status
 363  *
 364  * DESCRIPTION: Provides an access point to perform synchronization operations
 365  *              within the AML.  This operation is a request to wait for an
 366  *              event.
 367  *
 368  ******************************************************************************/
 369
 370 ACPI_STATUS
 371 AcpiExSystemWaitEvent (
 372     ACPI_OPERAND_OBJECT     *TimeDesc,
 373     ACPI_OPERAND_OBJECT     *ObjDesc)
 374 {
 375     ACPI_STATUS             Status = AE_OK;
 376
 377
 378     ACPI_FUNCTION_TRACE (ExSystemWaitEvent);
 379
 380
 381     if (ObjDesc)
 382     {
 383         Status = AcpiExSystemWaitSemaphore (ObjDesc->Event.OsSemaphore,
 384                     (UINT16) TimeDesc->Integer.Value);
 385     }
 386
 387     return_ACPI_STATUS (Status);
 388 }
 389
 390
 391 /*******************************************************************************
 392  *
 393  * FUNCTION:    AcpiExSystemResetEvent
 394  *
 395  * PARAMETERS:  ObjDesc         - The object descriptor for this op
 396  *
 397  * RETURN:      Status
 398  *
 399  * DESCRIPTION: Reset an event to a known state.
 400  *
 401  ******************************************************************************/
 402
 403 ACPI_STATUS
 404 AcpiExSystemResetEvent (
 405     ACPI_OPERAND_OBJECT     *ObjDesc)
 406 {
 407     ACPI_STATUS             Status = AE_OK;
 408     ACPI_SEMAPHORE          TempSemaphore;
 409
 410
 411     ACPI_FUNCTION_ENTRY ();
 412
 413
 414     /*
 415      * We are going to simply delete the existing semaphore and
 416      * create a new one!
 417      */
 418     Status = AcpiOsCreateSemaphore (ACPI_NO_UNIT_LIMIT, 0, &TempSemaphore);
 419     if (ACPI_SUCCESS (Status))
 420     {
 421         (void) AcpiOsDeleteSemaphore (ObjDesc->Event.OsSemaphore);
 422         ObjDesc->Event.OsSemaphore = TempSemaphore;
 423     }
 424
 425     return (Status);
 426 }
 427