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 *

 * Module Name: exresolv - AML Interpreter object resolution

 *

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

 *

 * 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 "amlcode.h"

#include "acdispat.h"

#include "acinterp.h"

#include "acnamesp.h"

        ACPI_MODULE_NAME    ("exresolv")

AcpiExResolveObjectToValue (

    ACPI_OPERAND_OBJECT     **StackPtr,

    ACPI_WALK_STATE         *WalkState);

 *

 * FUNCTION:    AcpiExResolveToValue

 *

 * PARAMETERS:  **StackPtr          - Points to entry on ObjStack, which can

 *                                    be either an (ACPI_OPERAND_OBJECT *)

 *                                    or an ACPI_HANDLE.

 *              WalkState           - Current method state

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Convert Reference objects to values

 *

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

AcpiExResolveToValue (

    ACPI_OPERAND_OBJECT     **StackPtr,

    ACPI_WALK_STATE         *WalkState)

{

    ACPI_STATUS             Status;

    {

        ACPI_ERROR ((AE_INFO, "Internal - null pointer"));

        return_ACPI_STATUS (AE_AML_NO_OPERAND);

    }

     * The entity pointed to by the StackPtr can be either

     * 1) A valid ACPI_OPERAND_OBJECT, or

     * 2) A ACPI_NAMESPACE_NODE (NamedObj)

     */

    if (ACPI_GET_DESCRIPTOR_TYPE (*StackPtr) == ACPI_DESC_TYPE_OPERAND)

    {

        Status = AcpiExResolveObjectToValue (StackPtr, WalkState);

        if (ACPI_FAILURE (Status))

        {

            return_ACPI_STATUS (Status);

        }

        {

            ACPI_ERROR ((AE_INFO, "Internal - null pointer"));

            return_ACPI_STATUS (AE_AML_NO_OPERAND);

        }

    }

     * Object on the stack may have changed if AcpiExResolveObjectToValue()

     * was called (i.e., we can't use an _else_ here.)

     */

    if (ACPI_GET_DESCRIPTOR_TYPE (*StackPtr) == ACPI_DESC_TYPE_NAMED)

    {

        Status = AcpiExResolveNodeToValue (

                        ACPI_CAST_INDIRECT_PTR (ACPI_NAMESPACE_NODE, StackPtr),

                        WalkState);

        if (ACPI_FAILURE (Status))

        {

            return_ACPI_STATUS (Status);

        }

    }

    return_ACPI_STATUS (AE_OK);

}

 *

 * FUNCTION:    AcpiExResolveObjectToValue

 *

 * PARAMETERS:  StackPtr        - Pointer to an internal object

 *              WalkState       - Current method state

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Retrieve the value from an internal object. The Reference type

 *              uses the associated AML opcode to determine the value.

 *

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

AcpiExResolveObjectToValue (

    ACPI_OPERAND_OBJECT     **StackPtr,

    ACPI_WALK_STATE         *WalkState)

{

    ACPI_STATUS             Status = AE_OK;

    ACPI_OPERAND_OBJECT     *StackDesc;

    ACPI_OPERAND_OBJECT     *ObjDesc = NULL;

    UINT8                   RefType;

    {

    case ACPI_TYPE_LOCAL_REFERENCE:

        {

        case ACPI_REFCLASS_LOCAL:

        case ACPI_REFCLASS_ARG:

             * Get the local from the method's state info

             * Note: this increments the local's object reference count

             */

            Status = AcpiDsMethodDataGetValue (RefType,

                            StackDesc->Reference.Value, WalkState, &ObjDesc);

            if (ACPI_FAILURE (Status))

            {

                return_ACPI_STATUS (Status);

            }

                StackDesc->Reference.Value, ObjDesc));

             * Now we can delete the original Reference Object and

             * replace it with the resolved value

             */

            AcpiUtRemoveReference (StackDesc);

            *StackPtr = ObjDesc;

            break;

            {

            case ACPI_TYPE_BUFFER_FIELD:

                break;

                    (WalkState->Opcode == AML_COPY_OP))

                {

                    break;

                }

                if (ObjDesc)

                {

                    /*

                     * Valid object descriptor, copy pointer to return value

                     * (i.e., dereference the package index)

                     * Delete the ref object, increment the returned object

                     */

                    AcpiUtRemoveReference (StackDesc);

                    AcpiUtAddReference (ObjDesc);

                    *StackPtr = ObjDesc;

                }

                else

                {

                    /*

                     * A NULL object descriptor means an uninitialized element of

                     * the package, can't dereference it

                     */

                    ACPI_ERROR ((AE_INFO,

                        "Attempt to dereference an Index to NULL package element Idx=%p",

                        StackDesc));

                    Status = AE_AML_UNINITIALIZED_ELEMENT;

                }

                break;

                    "Unknown TargetType 0x%X in Index/Reference object %p",

                    StackDesc->Reference.TargetType, StackDesc));

                Status = AE_AML_INTERNAL;

                break;

            }

            break;

        case ACPI_REFCLASS_DEBUG:

        case ACPI_REFCLASS_TABLE:

                (StackDesc->Reference.Node->Type == ACPI_TYPE_THERMAL))

            {

                /* These node types do not have 'real' subobjects */

            }

            else

            {

                /* Get the object pointed to by the namespace node */

                AcpiUtAddReference (*StackPtr);

            }

            break;

                "Unknown Reference type 0x%X in %p", RefType, StackDesc));

            Status = AE_AML_INTERNAL;

            break;

        }

        break;

        break;

        break;

    case ACPI_TYPE_LOCAL_REGION_FIELD:

    case ACPI_TYPE_LOCAL_BANK_FIELD:

    case ACPI_TYPE_LOCAL_INDEX_FIELD:

            StackDesc, StackDesc->Common.Type));

        *StackPtr = (void *) ObjDesc;

        break;

        break;

    }

}

 *

 * FUNCTION:    AcpiExResolveMultiple

 *

 * PARAMETERS:  WalkState           - Current state (contains AML opcode)

 *              Operand             - Starting point for resolution

 *              ReturnType          - Where the object type is returned

 *              ReturnDesc          - Where the resolved object is returned

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Return the base object and type.  Traverse a reference list if

 *              necessary to get to the base object.

 *

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

AcpiExResolveMultiple (

    ACPI_WALK_STATE         *WalkState,

    ACPI_OPERAND_OBJECT     *Operand,

    ACPI_OBJECT_TYPE        *ReturnType,

    ACPI_OPERAND_OBJECT     **ReturnDesc)

{

    ACPI_OPERAND_OBJECT     *ObjDesc = (void *) Operand;

    ACPI_NAMESPACE_NODE     *Node;

    ACPI_OBJECT_TYPE        Type;

    ACPI_STATUS             Status;

    {

    case ACPI_DESC_TYPE_OPERAND:

        Type = ObjDesc->Common.Type;

        break;

        Type = ((ACPI_NAMESPACE_NODE *) ObjDesc)->Type;

        ObjDesc = AcpiNsGetAttachedObject ((ACPI_NAMESPACE_NODE *) ObjDesc);

        {

            Type = ((ACPI_NAMESPACE_NODE *) ObjDesc)->Type;

            ObjDesc = AcpiNsGetAttachedObject ((ACPI_NAMESPACE_NODE *) ObjDesc);

        }

        break;

        return_ACPI_STATUS (AE_AML_OPERAND_TYPE);

    }

    {

        goto Exit;

    }

     * For reference objects created via the RefOf, Index, or Load/LoadTable

     * operators, we need to get to the base object (as per the ACPI

     * specification of the ObjectType and SizeOf operators). This means

     * traversing the list of possibly many nested references.

     */

    while (ObjDesc->Common.Type == ACPI_TYPE_LOCAL_REFERENCE)

    {

        switch (ObjDesc->Reference.Class)

        {

        case ACPI_REFCLASS_REFOF:

        case ACPI_REFCLASS_NAME:

            {

                Node = ObjDesc->Reference.Object;

            }

            else /* AML_INT_NAMEPATH_OP */

            {

                Node = ObjDesc->Reference.Node;

            }

            {

                ACPI_ERROR ((AE_INFO,

                    "Not a namespace node %p [%s]",

                    Node, AcpiUtGetDescriptorName (Node)));

                return_ACPI_STATUS (AE_AML_INTERNAL);

            }

            if (!ObjDesc)

            {

                /* No object, use the NS node type */

                goto Exit;

            }

            {

                return_ACPI_STATUS (AE_AML_CIRCULAR_REFERENCE);

            }

            break;

            if (Type != ACPI_TYPE_PACKAGE)

            {

                goto Exit;

            }

             * The main object is a package, we want to get the type

             * of the individual package element that is referenced by

             * the index.

             *

             * This could of course in turn be another reference object.

             */

            ObjDesc = *(ObjDesc->Reference.Where);

            if (!ObjDesc)

            {

                /* NULL package elements are allowed */

                goto Exit;

            }

            break;

            goto Exit;

        case ACPI_REFCLASS_ARG:

            {

                Status = AcpiDsMethodDataGetValue (ObjDesc->Reference.Class,

                            ObjDesc->Reference.Value, WalkState, &ObjDesc);

                if (ACPI_FAILURE (Status))

                {

                    return_ACPI_STATUS (Status);

                }

                AcpiUtRemoveReference (ObjDesc);

            }

            else

            {

                Status = AcpiDsMethodDataGetNode (ObjDesc->Reference.Class,

                            ObjDesc->Reference.Value, WalkState, &Node);

                if (ACPI_FAILURE (Status))

                {

                    return_ACPI_STATUS (Status);

                }

                if (!ObjDesc)

                {

                    Type = ACPI_TYPE_ANY;

                    goto Exit;

                }

            }

            break;

            goto Exit;

                "Unknown Reference Class 0x%2.2X", ObjDesc->Reference.Class));

            return_ACPI_STATUS (AE_AML_INTERNAL);

        }

    }

     * Now we are guaranteed to have an object that has not been created

     * via the RefOf or Index operators.

     */

    Type = ObjDesc->Common.Type;

    /* Convert internal types to external types */

    {

    case ACPI_TYPE_LOCAL_REGION_FIELD:

    case ACPI_TYPE_LOCAL_BANK_FIELD:

    case ACPI_TYPE_LOCAL_INDEX_FIELD:

        break;

        break;

        /* No change to Type required */

        break;

    }

    if (ReturnDesc)

    {

        *ReturnDesc = ObjDesc;

    }

    return_ACPI_STATUS (AE_OK);

}