text: 
  /******************************************************************************
   *
   * Module Name: exsystem - Interface to OS services
   *
   *****************************************************************************/
  
  /******************************************************************************
   *
   * 1. Copyright Notice
   *
   * Some or all of this work - Copyright (c) 1999 - 2011, Intel Corp.
   * All rights reserved.
   *
   * 2. License
   *
   * 2.1. This is your license from Intel Corp. under its intellectual property
   * rights.  You may have additional license terms from the party that provided
   * you this software, covering your right to use that party's intellectual
   * property rights.
   *
   * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
   * copy of the source code appearing in this file ("Covered Code") an
   * irrevocable, perpetual, worldwide license under Intel's copyrights in the
   * base code distributed originally by Intel ("Original Intel Code") to copy,
   * make derivatives, distribute, use and display any portion of the Covered
   * Code in any form, with the right to sublicense such rights; and
   *
   * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
   * license (with the right to sublicense), under only those claims of Intel
   * patents that are infringed by the Original Intel Code, to make, use, sell,
   * offer to sell, and import the Covered Code and derivative works thereof
   * solely to the minimum extent necessary to exercise the above copyright
   * license, and in no event shall the patent license extend to any additions
   * to or modifications of the Original Intel Code.  No other license or right
   * is granted directly or by implication, estoppel or otherwise;
   *
   * The above copyright and patent license is granted only if the following
   * conditions are met:
   *
   * 3. Conditions
   *
   * 3.1. Redistribution of Source with Rights to Further Distribute Source.
   * Redistribution of source code of any substantial portion of the Covered
   * Code or modification with rights to further distribute source must include
   * the above Copyright Notice, the above License, this list of Conditions,
   * and the following Disclaimer and Export Compliance provision.  In addition,
   * Licensee must cause all Covered Code to which Licensee contributes to
   * contain a file documenting the changes Licensee made to create that Covered
   * Code and the date of any change.  Licensee must include in that file the
   * documentation of any changes made by any predecessor Licensee.  Licensee
   * must include a prominent statement that the modification is derived,
   * directly or indirectly, from Original Intel Code.
   *
   * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
   * Redistribution of source code of any substantial portion of the Covered
   * Code or modification without rights to further distribute source must
   * include the following Disclaimer and Export Compliance provision in the
   * documentation and/or other materials provided with distribution.  In
   * addition, Licensee may not authorize further sublicense of source of any
   * portion of the Covered Code, and must include terms to the effect that the
   * license from Licensee to its licensee is limited to the intellectual
   * property embodied in the software Licensee provides to its licensee, and
   * not to intellectual property embodied in modifications its licensee may
   * make.
   *
   * 3.3. Redistribution of Executable. Redistribution in executable form of any
   * substantial portion of the Covered Code or modification must reproduce the
   * above Copyright Notice, and the following Disclaimer and Export Compliance
   * provision in the documentation and/or other materials provided with the
   * distribution.
   *
   * 3.4. Intel retains all right, title, and interest in and to the Original
   * Intel Code.
   *
   * 3.5. Neither the name Intel nor any other trademark owned or controlled by
   * Intel shall be used in advertising or otherwise to promote the sale, use or
   * other dealings in products derived from or relating to the Covered Code
   * without prior written authorization from Intel.
   *
   * 4. Disclaimer and Export Compliance
   *
   * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
   * HERE.  ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
   * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT,  ASSISTANCE,
   * INSTALLATION, TRAINING OR OTHER SERVICES.  INTEL WILL NOT PROVIDE ANY
   * UPDATES, ENHANCEMENTS OR EXTENSIONS.  INTEL SPECIFICALLY DISCLAIMS ANY
   * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
   * PARTICULAR PURPOSE.
   *
   * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
   * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
   * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
   * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
   * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
   * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.  THESE LIMITATIONS
   * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
   * LIMITED REMEDY.
   *
   * 4.3. Licensee shall not export, either directly or indirectly, any of this
   * software or system incorporating such software without first obtaining any
   * required license or other approval from the U. S. Department of Commerce or
   * any other agency or department of the United States Government.  In the
   * event Licensee exports any such software from the United States or
   * re-exports any such software from a foreign destination, Licensee shall
   * ensure that the distribution and export/re-export of the software is in
   * compliance with all laws, regulations, orders, or other restrictions of the
   * U.S. Export Administration Regulations. Licensee agrees that neither it nor
   * any of its subsidiaries will export/re-export any technical data, process,
   * software, or service, directly or indirectly, to any country for which the
   * United States government or any agency thereof requires an export license,
   * other governmental approval, or letter of assurance, without first obtaining
   * such license, approval or letter.
   *
   *****************************************************************************/
  
  #define __EXSYSTEM_C__
  
  #include "acpi/acpi.h"
  #include "acpi/accommon.h"
  #include "acpi/acinterp.h"
  
  #define _COMPONENT          ACPI_EXECUTER
          ACPI_MODULE_NAME    ("exsystem")
  
  
  /*******************************************************************************
   *
   * FUNCTION:    AcpiExSystemWaitSemaphore
   *
   * PARAMETERS:  Semaphore       - Semaphore to wait on
   *              Timeout         - Max time to wait
   *
   * RETURN:      Status
   *
   * DESCRIPTION: Implements a semaphore wait with a check to see if the
   *              semaphore is available immediately.  If it is not, the
   *              interpreter is released before waiting.
   *
   ******************************************************************************/
  
  ACPI_STATUS
  AcpiExSystemWaitSemaphore (
      ACPI_SEMAPHORE          Semaphore,
      UINT16                  Timeout)
  {
      ACPI_STATUS             Status;
  
  
      ACPI_FUNCTION_TRACE (ExSystemWaitSemaphore);
  
  
      Status = AcpiOsWaitSemaphore (Semaphore, 1, ACPI_DO_NOT_WAIT);
      if (ACPI_SUCCESS (Status))
      {
          return_ACPI_STATUS (Status);
      }
  
      if (Status == AE_TIME)
      {
          /* We must wait, so unlock the interpreter */
  
          AcpiExRelinquishInterpreter ();
  
          Status = AcpiOsWaitSemaphore (Semaphore, 1, Timeout);
  
          ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
              "*** Thread awake after blocking, %s\n",
              AcpiFormatException (Status)));
  
          /* Reacquire the interpreter */
  
         AcpiExReacquireInterpreter ();
      }
  
      return_ACPI_STATUS (Status);
  }
  
  
  /*******************************************************************************
   *
   * FUNCTION:    AcpiExSystemWaitMutex
   *
   * PARAMETERS:  Mutex           - Mutex to wait on
   *              Timeout         - Max time to wait
   *
   * RETURN:      Status
   *
   * DESCRIPTION: Implements a mutex wait with a check to see if the
   *              mutex is available immediately.  If it is not, the
   *              interpreter is released before waiting.
   *
   ******************************************************************************/
  
  ACPI_STATUS
  AcpiExSystemWaitMutex (
      ACPI_MUTEX              Mutex,
      UINT16                  Timeout)
  {
      ACPI_STATUS             Status;
  
  
      ACPI_FUNCTION_TRACE (ExSystemWaitMutex);
  
  
      Status = AcpiOsAcquireMutex (Mutex, ACPI_DO_NOT_WAIT);
      if (ACPI_SUCCESS (Status))
      {
          return_ACPI_STATUS (Status);
      }
  
      if (Status == AE_TIME)
      {
          /* We must wait, so unlock the interpreter */
  
          AcpiExRelinquishInterpreter ();
  
          Status = AcpiOsAcquireMutex (Mutex, Timeout);
  
          ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
              "*** Thread awake after blocking, %s\n",
              AcpiFormatException (Status)));
  
          /* Reacquire the interpreter */
  
          AcpiExReacquireInterpreter ();
      }
  
      return_ACPI_STATUS (Status);
  }
  
  
  /*******************************************************************************
   *
   * FUNCTION:    AcpiExSystemDoStall
   *
   * PARAMETERS:  HowLong         - The amount of time to stall,
   *                                in microseconds
   *
   * RETURN:      Status
   *
   * DESCRIPTION: Suspend running thread for specified amount of time.
   *              Note: ACPI specification requires that Stall() does not
   *              relinquish the processor, and delays longer than 100 usec
   *              should use Sleep() instead.  We allow stalls up to 255 usec
   *              for compatibility with other interpreters and existing BIOSs.
   *
   ******************************************************************************/
  
  ACPI_STATUS
  AcpiExSystemDoStall (
      UINT32                  HowLong)
  {
      ACPI_STATUS             Status = AE_OK;
  
  
      ACPI_FUNCTION_ENTRY ();
  
  
      if (HowLong > 255) /* 255 microseconds */
      {
          /*
           * Longer than 255 usec, this is an error
           *
           * (ACPI specifies 100 usec as max, but this gives some slack in
           * order to support existing BIOSs)
           */
          ACPI_ERROR ((AE_INFO, "Time parameter is too large (%u)",
              HowLong));
          Status = AE_AML_OPERAND_VALUE;
      }
      else
      {
          AcpiOsStall (HowLong);
      }
  
      return (Status);
  }
  
  
  /*******************************************************************************
   *
   * FUNCTION:    AcpiExSystemDoSleep
   *
   * PARAMETERS:  HowLong         - The amount of time to sleep,
   *                                in milliseconds
   *
   * RETURN:      None
   *
   * DESCRIPTION: Sleep the running thread for specified amount of time.
   *
   ******************************************************************************/
  
  ACPI_STATUS
  AcpiExSystemDoSleep (
      UINT64                  HowLong)
  {
      ACPI_FUNCTION_ENTRY ();
  
  
      /* Since this thread will sleep, we must release the interpreter */
  
      AcpiExRelinquishInterpreter ();
  
      /*
       * For compatibility with other ACPI implementations and to prevent
       * accidental deep sleeps, limit the sleep time to something reasonable.
       */
      if (HowLong > ACPI_MAX_SLEEP)
      {
          HowLong = ACPI_MAX_SLEEP;
      }
  
      AcpiOsSleep (HowLong);
  
      /* And now we must get the interpreter again */
  
      AcpiExReacquireInterpreter ();
      return (AE_OK);
  }
  
  
  /*******************************************************************************
   *
   * FUNCTION:    AcpiExSystemSignalEvent
   *
   * PARAMETERS:  ObjDesc         - The object descriptor for this op
   *
   * RETURN:      Status
   *
   * DESCRIPTION: Provides an access point to perform synchronization operations
   *              within the AML.
   *
   ******************************************************************************/
  
  ACPI_STATUS
  AcpiExSystemSignalEvent (
      ACPI_OPERAND_OBJECT     *ObjDesc)
  {
      ACPI_STATUS             Status = AE_OK;
  
  
      ACPI_FUNCTION_TRACE (ExSystemSignalEvent);
  
  
      if (ObjDesc)
      {
          Status = AcpiOsSignalSemaphore (ObjDesc->Event.OsSemaphore, 1);
      }
  
      return_ACPI_STATUS (Status);
  }
  
  
  /*******************************************************************************
   *
   * FUNCTION:    AcpiExSystemWaitEvent
   *
   * PARAMETERS:  TimeDesc        - The 'time to delay' object descriptor
   *              ObjDesc         - The object descriptor for this op
   *
   * RETURN:      Status
   *
   * DESCRIPTION: Provides an access point to perform synchronization operations
   *              within the AML.  This operation is a request to wait for an
   *              event.
   *
   ******************************************************************************/
  
  ACPI_STATUS
  AcpiExSystemWaitEvent (
      ACPI_OPERAND_OBJECT     *TimeDesc,
      ACPI_OPERAND_OBJECT     *ObjDesc)
  {
      ACPI_STATUS             Status = AE_OK;
  
  
      ACPI_FUNCTION_TRACE (ExSystemWaitEvent);
  
  
      if (ObjDesc)
      {
          Status = AcpiExSystemWaitSemaphore (ObjDesc->Event.OsSemaphore,
                      (UINT16) TimeDesc->Integer.Value);
      }
  
      return_ACPI_STATUS (Status);
  }
  
  
  /*******************************************************************************
   *
   * FUNCTION:    AcpiExSystemResetEvent
   *
   * PARAMETERS:  ObjDesc         - The object descriptor for this op
   *
   * RETURN:      Status
   *
   * DESCRIPTION: Reset an event to a known state.
   *
   ******************************************************************************/
  
  ACPI_STATUS
  AcpiExSystemResetEvent (
      ACPI_OPERAND_OBJECT     *ObjDesc)
  {
      ACPI_STATUS             Status = AE_OK;
      ACPI_SEMAPHORE          TempSemaphore;
  
  
      ACPI_FUNCTION_ENTRY ();
  
  
      /*
       * We are going to simply delete the existing semaphore and
       * create a new one!
       */
      Status = AcpiOsCreateSemaphore (ACPI_NO_UNIT_LIMIT, 0, &TempSemaphore);
      if (ACPI_SUCCESS (Status))
      {
          (void) AcpiOsDeleteSemaphore (ObjDesc->Event.OsSemaphore);
          ObjDesc->Event.OsSemaphore = TempSemaphore;
      }
  
      return (Status);
  }
  
  