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 *

 * 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.

 *

 *****************************************************************************/

#include "accommon.h"

#include "acinterp.h"

        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.

 *

 ******************************************************************************/

AcpiExSystemWaitSemaphore (

    ACPI_SEMAPHORE          Semaphore,

    UINT16                  Timeout)

{

    ACPI_STATUS             Status;

    if (ACPI_SUCCESS (Status))

    {

        return_ACPI_STATUS (Status);

    }

    {

        /* We must wait, so unlock the interpreter */

            "*** Thread awake after blocking, %s\n",

            AcpiFormatException (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.

 *

 ******************************************************************************/

AcpiExSystemWaitMutex (

    ACPI_MUTEX              Mutex,

    UINT16                  Timeout)

{

    ACPI_STATUS             Status;

    if (ACPI_SUCCESS (Status))

    {

        return_ACPI_STATUS (Status);

    }

    {

        /* We must wait, so unlock the interpreter */

            "*** Thread awake after blocking, %s\n",

            AcpiFormatException (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.

 *

 ******************************************************************************/

AcpiExSystemDoStall (

    UINT32                  HowLong)

{

    ACPI_STATUS             Status = AE_OK;

    {

        /*

         * 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);

    }

}

 *

 * FUNCTION:    AcpiExSystemDoSleep

 *

 * PARAMETERS:  HowLong         - The amount of time to sleep,

 *                                in milliseconds

 *

 * RETURN:      None

 *

 * DESCRIPTION: Sleep the running thread for specified amount of time.

 *

 ******************************************************************************/

AcpiExSystemDoSleep (

    UINT64                  HowLong)

{

    ACPI_FUNCTION_ENTRY ();

     * 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;

    }

    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.

 *

 ******************************************************************************/

AcpiExSystemSignalEvent (

    ACPI_OPERAND_OBJECT     *ObjDesc)

{

    ACPI_STATUS             Status = AE_OK;

    {

        Status = AcpiOsSignalSemaphore (ObjDesc->Event.OsSemaphore, 1);

    }

}

 *

 * 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.

 *

 ******************************************************************************/

AcpiExSystemWaitEvent (

    ACPI_OPERAND_OBJECT     *TimeDesc,

    ACPI_OPERAND_OBJECT     *ObjDesc)

{

    ACPI_STATUS             Status = AE_OK;

    {

        Status = AcpiExSystemWaitSemaphore (ObjDesc->Event.OsSemaphore,

                    (UINT16) TimeDesc->Integer.Value);

    }

}

 *

 * FUNCTION:    AcpiExSystemResetEvent

 *

 * PARAMETERS:  ObjDesc         - The object descriptor for this op

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Reset an event to a known state.

 *

 ******************************************************************************/

AcpiExSystemResetEvent (

    ACPI_OPERAND_OBJECT     *ObjDesc)

{

    ACPI_STATUS             Status = AE_OK;

    ACPI_SEMAPHORE          TempSemaphore;

     * 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;

    }

}