dswexec.c

acpi tools for linux include acpiexec and acpixtract

/******************************************************************************
 *
 * Module Name: dswexec - Dispatcher method execution callbacks;
 *                        dispatch to interpreter.
 *              $Revision: 1.138 $
 *
 *****************************************************************************/

/******************************************************************************
 *
 * 1. Copyright Notice
 *
 * Some or all of this work - Copyright (c) 1999 - 2008, 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 __DSWEXEC_C__

#include "acpi.h"
#include "acparser.h"
#include "amlcode.h"
#include "acdispat.h"
#include "acinterp.h"
#include "acnamesp.h"
#include "acdebug.h"


#define _COMPONENT          ACPI_DISPATCHER
        ACPI_MODULE_NAME    ("dswexec")

/*
 * Dispatch table for opcode classes
 */
static ACPI_EXECUTE_OP      AcpiGbl_OpTypeDispatch [] =
{
    AcpiExOpcode_0A_0T_1R,
    AcpiExOpcode_1A_0T_0R,
    AcpiExOpcode_1A_0T_1R,
    AcpiExOpcode_1A_1T_0R,
    AcpiExOpcode_1A_1T_1R,
    AcpiExOpcode_2A_0T_0R,
    AcpiExOpcode_2A_0T_1R,
    AcpiExOpcode_2A_1T_1R,
    AcpiExOpcode_2A_2T_1R,
    AcpiExOpcode_3A_0T_0R,
    AcpiExOpcode_3A_1T_1R,
    AcpiExOpcode_6A_0T_1R
};


/*****************************************************************************
 *
 * FUNCTION:    AcpiDsGetPredicateValue
 *
 * PARAMETERS:  WalkState       - Current state of the parse tree walk
 *              ResultObj       - if non-zero, pop result from result stack
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Get the result of a predicate evaluation
 *
 ****************************************************************************/

ACPI_STATUS
AcpiDsGetPredicateValue (
    ACPI_WALK_STATE         *WalkState,
    ACPI_OPERAND_OBJECT     *ResultObj)
{
    ACPI_STATUS             Status = AE_OK;
    ACPI_OPERAND_OBJECT     *ObjDesc;
    ACPI_OPERAND_OBJECT     *LocalObjDesc = NULL;


    ACPI_FUNCTION_TRACE_PTR (DsGetPredicateValue, WalkState);


    WalkState->ControlState->Common.State = 0;

    if (ResultObj)
    {
        Status = AcpiDsResultPop (&ObjDesc, WalkState);
        if (ACPI_FAILURE (Status))
        {
            ACPI_EXCEPTION ((AE_INFO, Status,
                "Could not get result from predicate evaluation"));

            return_ACPI_STATUS (Status);
        }
    }
    else
    {
        Status = AcpiDsCreateOperand (WalkState, WalkState->Op, 0);
        if (ACPI_FAILURE (Status))
        {
            return_ACPI_STATUS (Status);
        }

        Status = AcpiExResolveToValue (&WalkState->Operands [0], WalkState);
        if (ACPI_FAILURE (Status))
        {
            return_ACPI_STATUS (Status);
        }

        ObjDesc = WalkState->Operands [0];
    }

    if (!ObjDesc)
    {
        ACPI_ERROR ((AE_INFO,
            "No predicate ObjDesc=%p State=%p",
            ObjDesc, WalkState));

        return_ACPI_STATUS (AE_AML_NO_OPERAND);
    }

    /*
     * Result of predicate evaluation must be an Integer
     * object. Implicitly convert the argument if necessary.
     */
    Status = AcpiExConvertToInteger (ObjDesc, &LocalObjDesc, 16);
    if (ACPI_FAILURE (Status))
    {
        goto Cleanup;
    }

    if (ACPI_GET_OBJECT_TYPE (LocalObjDesc) != ACPI_TYPE_INTEGER)
    {
        ACPI_ERROR ((AE_INFO,
            "Bad predicate (not an integer) ObjDesc=%p State=%p Type=%X",
            ObjDesc, WalkState, ACPI_GET_OBJECT_TYPE (ObjDesc)));

        Status = AE_AML_OPERAND_TYPE;
        goto Cleanup;
    }

    /* Truncate the predicate to 32-bits if necessary */

    AcpiExTruncateFor32bitTable (LocalObjDesc);

    /*
     * Save the result of the predicate evaluation on
     * the control stack
     */
    if (LocalObjDesc->Integer.Value)
    {
        WalkState->ControlState->Common.Value = TRUE;
    }
    else
    {
        /*
         * Predicate is FALSE, we will just toss the
         * rest of the package
         */
        WalkState->ControlState->Common.Value = FALSE;
        Status = AE_CTRL_FALSE;
    }


Cleanup:

    ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Completed a predicate eval=%X Op=%p\n",
        WalkState->ControlState->Common.Value, WalkState->Op));

     /* Break to debugger to display result */

    ACPI_DEBUGGER_EXEC (AcpiDbDisplayResultObject (LocalObjDesc, WalkState));

    /*
     * Delete the predicate result object (we know that
     * we don't need it anymore)
     */
    if (LocalObjDesc != ObjDesc)
    {
        AcpiUtRemoveReference (LocalObjDesc);
    }
    AcpiUtRemoveReference (ObjDesc);

    WalkState->ControlState->Common.State = ACPI_CONTROL_NORMAL;
    return_ACPI_STATUS (Status);
}


/*****************************************************************************
 *
 * FUNCTION:    AcpiDsExecBeginOp
 *
 * PARAMETERS:  WalkState       - Current state of the parse tree walk
 *              OutOp           - Where to return op if a new one is created
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Descending callback used during the execution of control
 *              methods.  This is where most operators and operands are
 *              dispatched to the interpreter.
 *
 ****************************************************************************/

ACPI_STATUS
AcpiDsExecBeginOp (
    ACPI_WALK_STATE         *WalkState,
    ACPI_PARSE_OBJECT       **OutOp)
{
    ACPI_PARSE_OBJECT       *Op;
    ACPI_STATUS             Status = AE_OK;
    UINT32                  OpcodeClass;


    ACPI_FUNCTION_TRACE_PTR (DsExecBeginOp, WalkState);


    Op = WalkState->Op;
    if (!Op)
    {
        Status = AcpiDsLoad2BeginOp (WalkState, OutOp);
        if (ACPI_FAILURE (Status))
        {
            goto ErrorExit;
        }

        Op = *OutOp;
        WalkState->Op = Op;
        WalkState->Opcode = Op->Common.AmlOpcode;
        WalkState->OpInfo = AcpiPsGetOpcodeInfo (Op->Common.AmlOpcode);

        if (AcpiNsOpensScope (WalkState->OpInfo->ObjectType))
        {
            ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
                "(%s) Popping scope for Op %p\n",
                AcpiUtGetTypeName (WalkState->OpInfo->ObjectType), Op));

            Status = AcpiDsScopeStackPop (WalkState);
            if (ACPI_FAILURE (Status))
            {
                goto ErrorExit;
            }
        }
    }

    if (Op == WalkState->Origin)
    {
        if (OutOp)
        {
            *OutOp = Op;
        }

        return_ACPI_STATUS (AE_OK);
    }

    /*
     * If the previous opcode was a conditional, this opcode
     * must be the beginning of the associated predicate.
     * Save this knowledge in the current scope descriptor
     */
    if ((WalkState->ControlState) &&
        (WalkState->ControlState->Common.State ==
            ACPI_CONTROL_CONDITIONAL_EXECUTING))
    {
        ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Exec predicate Op=%p State=%p\n",
                        Op, WalkState));

        WalkState->ControlState->Common.State = ACPI_CONTROL_PREDICATE_EXECUTING;

        /* Save start of predicate */

        WalkState->ControlState->Control.PredicateOp = Op;
    }


    OpcodeClass = WalkState->OpInfo->Class;

    /* We want to send namepaths to the load code */

    if (Op->Common.AmlOpcode == AML_INT_NAMEPATH_OP)
    {
        OpcodeClass = AML_CLASS_NAMED_OBJECT;
    }

    /*
     * Handle the opcode based upon the opcode type
     */
    switch (OpcodeClass)
    {
    case AML_CLASS_CONTROL:

        Status = AcpiDsExecBeginControlOp (WalkState, Op);
        break;


    case AML_CLASS_NAMED_OBJECT:

        if (WalkState->WalkType & ACPI_WALK_METHOD)
        {
            /*
             * Found a named object declaration during method execution;
             * we must enter this object into the namespace.  The created
             * object is temporary and will be deleted upon completion of
             * the execution of this method.
             */
            Status = AcpiDsLoad2BeginOp (WalkState, NULL);
        }

        break;


    case AML_CLASS_EXECUTE:
    case AML_CLASS_CREATE:

        break;


    default:
        break;
    }

    /* Nothing to do here during method execution */

    return_ACPI_STATUS (Status);


ErrorExit:
    Status = AcpiDsMethodError (Status, WalkState);
    return_ACPI_STATUS (Status);
}


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