static void
AcpiDsMethodDataDeleteValue (
    UINT8                   Type,
    UINT32                  Index,
    ACPI_WALK_STATE         *WalkState)
{
    ACPI_STATUS             Status;
    ACPI_NAMESPACE_NODE     *Node;
    ACPI_OPERAND_OBJECT     *Object;


    ACPI_FUNCTION_TRACE (DsMethodDataDeleteValue);


    /* Get the namespace node for the arg/local */

    Status = AcpiDsMethodDataGetNode (Type, Index, WalkState, &Node);
    if (ACPI_FAILURE (Status))
    {
        return_VOID;
    }

    /* Get the associated object */

    Object = AcpiNsGetAttachedObject (Node);

    /*
     * Undefine the Arg or Local by setting its descriptor
     * pointer to NULL. Locals/Args can contain both
     * ACPI_OPERAND_OBJECTS and ACPI_NAMESPACE_NODEs
     */
    Node->Object = NULL;

    if ((Object) &&
        (ACPI_GET_DESCRIPTOR_TYPE (Object) == ACPI_DESC_TYPE_OPERAND))
    {
        /*
         * There is a valid object.
         * Decrement the reference count by one to balance the
         * increment when the object was stored.
         */
        AcpiUtRemoveReference (Object);
    }

    return_VOID;
}

static ACPI_STATUS
AcpiDsMethodDataSetValue (
    UINT8                   Type,
    UINT32                  Index,
    ACPI_OPERAND_OBJECT     *Object,
    ACPI_WALK_STATE         *WalkState)
{
    ACPI_STATUS             Status;
    ACPI_NAMESPACE_NODE     *Node;


    ACPI_FUNCTION_TRACE (DsMethodDataSetValue);


    ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
        "NewObj %p Type %2.2X, Refs=%u [%s]\n", Object,
        Type, Object->Common.ReferenceCount,
        AcpiUtGetTypeName (Object->Common.Type)));

    /* Get the namespace node for the arg/local */

    Status = AcpiDsMethodDataGetNode (Type, Index, WalkState, &Node);
    if (ACPI_FAILURE (Status))
    {
        return_ACPI_STATUS (Status);
    }

    /*
     * Increment ref count so object can't be deleted while installed.
     * NOTE: We do not copy the object in order to preserve the call by
     * reference semantics of ACPI Control Method invocation.
     * (See ACPI Specification 2.0C)
     */
    AcpiUtAddReference (Object);

    /* Install the object */

    Node->Object = Object;
    return_ACPI_STATUS (Status);
}

ACPI_OBJECT_TYPE
AcpiDsMethodDataGetType (
    UINT16                  Opcode,
    UINT32                  Index,
    ACPI_WALK_STATE         *WalkState)
{
    ACPI_STATUS             Status;
    ACPI_NAMESPACE_NODE     *Node;
    ACPI_OPERAND_OBJECT     *Object;


    ACPI_FUNCTION_TRACE (DsMethodDataGetType);


    /* Get the namespace node for the arg/local */

    Status = AcpiDsMethodDataGetNode (Opcode, Index, WalkState, &Node);
    if (ACPI_FAILURE (Status))
    {
        return_VALUE ((ACPI_TYPE_NOT_FOUND));
    }

    /* Get the object */

    Object = AcpiNsGetAttachedObject (Node);
    if (!Object)
    {
        /* Uninitialized local/arg, return TYPE_ANY */

        return_VALUE (ACPI_TYPE_ANY);
    }

    /* Get the object type */

    return_VALUE (Object->Type);
}

//.........这里部分代码省略.........
            ACPI_ERROR ((AE_INFO, "Unknown Integer type 0x%X",
                OpInfo->Type));
            Status = AE_AML_OPERAND_TYPE;
            break;
        }
        break;


    case ACPI_TYPE_STRING:

        ObjDesc->String.Pointer = Op->Common.Value.String;
        ObjDesc->String.Length = (UINT32) ACPI_STRLEN (Op->Common.Value.String);

        /*
         * The string is contained in the ACPI table, don't ever try
         * to delete it
         */
        ObjDesc->Common.Flags |= AOPOBJ_STATIC_POINTER;
        break;


    case ACPI_TYPE_METHOD:
        break;


    case ACPI_TYPE_LOCAL_REFERENCE:

        switch (OpInfo->Type)
        {
        case AML_TYPE_LOCAL_VARIABLE:

            /* Local ID (0-7) is (AML opcode - base AML_LOCAL_OP) */

            ObjDesc->Reference.Value = ((UINT32) Opcode) - AML_LOCAL_OP;
            ObjDesc->Reference.Class = ACPI_REFCLASS_LOCAL;

#ifndef ACPI_NO_METHOD_EXECUTION
            Status = AcpiDsMethodDataGetNode (ACPI_REFCLASS_LOCAL,
                        ObjDesc->Reference.Value, WalkState,
                        ACPI_CAST_INDIRECT_PTR (ACPI_NAMESPACE_NODE,
                            &ObjDesc->Reference.Object));
#endif
            break;


        case AML_TYPE_METHOD_ARGUMENT:

            /* Arg ID (0-6) is (AML opcode - base AML_ARG_OP) */

            ObjDesc->Reference.Value = ((UINT32) Opcode) - AML_ARG_OP;
            ObjDesc->Reference.Class = ACPI_REFCLASS_ARG;

#ifndef ACPI_NO_METHOD_EXECUTION
            Status = AcpiDsMethodDataGetNode (ACPI_REFCLASS_ARG,
                        ObjDesc->Reference.Value, WalkState,
                        ACPI_CAST_INDIRECT_PTR (ACPI_NAMESPACE_NODE,
                            &ObjDesc->Reference.Object));
#endif
            break;

        default: /* Object name or Debug object */

            switch (Op->Common.AmlOpcode)
            {
            case AML_INT_NAMEPATH_OP:

                /* Node was saved in Op */

                ObjDesc->Reference.Node = Op->Common.Node;
                ObjDesc->Reference.Object = Op->Common.Node->Object;
                ObjDesc->Reference.Class = ACPI_REFCLASS_NAME;
                break;

            case AML_DEBUG_OP:

                ObjDesc->Reference.Class = ACPI_REFCLASS_DEBUG;
                break;

            default:

                ACPI_ERROR ((AE_INFO,
                    "Unimplemented reference type for AML opcode: 0x%4.4X", Opcode));
                return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
            }
            break;
        }
        break;


    default:

        ACPI_ERROR ((AE_INFO, "Unimplemented data type: 0x%X",
            ObjDesc->Common.Type));

        Status = AE_AML_OPERAND_TYPE;
        break;
    }

    return_ACPI_STATUS (Status);
}

ACPI_STATUS
AcpiDsStoreObjectToLocal (
    UINT8                   Type,
    UINT32                  Index,
    ACPI_OPERAND_OBJECT     *ObjDesc,
    ACPI_WALK_STATE         *WalkState)
{
    ACPI_STATUS             Status;
    ACPI_NAMESPACE_NODE     *Node;
    ACPI_OPERAND_OBJECT     *CurrentObjDesc;
    ACPI_OPERAND_OBJECT     *NewObjDesc;


    ACPI_FUNCTION_TRACE (DsStoreObjectToLocal);
    ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Type=%2.2X Index=%u Obj=%p\n",
        Type, Index, ObjDesc));

    /* Parameter validation */

    if (!ObjDesc)
    {
        return_ACPI_STATUS (AE_BAD_PARAMETER);
    }

    /* Get the namespace node for the arg/local */

    Status = AcpiDsMethodDataGetNode (Type, Index, WalkState, &Node);
    if (ACPI_FAILURE (Status))
    {
        return_ACPI_STATUS (Status);
    }

    CurrentObjDesc = AcpiNsGetAttachedObject (Node);
    if (CurrentObjDesc == ObjDesc)
    {
        ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Obj=%p already installed!\n",
            ObjDesc));
        return_ACPI_STATUS (Status);
    }

    /*
     * If the reference count on the object is more than one, we must
     * take a copy of the object before we store.  A reference count
     * of exactly 1 means that the object was just created during the
     * evaluation of an expression, and we can safely use it since it
     * is not used anywhere else.
     */
    NewObjDesc = ObjDesc;
    if (ObjDesc->Common.ReferenceCount > 1)
    {
        Status = AcpiUtCopyIobjectToIobject (ObjDesc, &NewObjDesc, WalkState);
        if (ACPI_FAILURE (Status))
        {
            return_ACPI_STATUS (Status);
        }
    }

    /*
     * If there is an object already in this slot, we either
     * have to delete it, or if this is an argument and there
     * is an object reference stored there, we have to do
     * an indirect store!
     */
    if (CurrentObjDesc)
    {
        /*
         * Check for an indirect store if an argument
         * contains an object reference (stored as an Node).
         * We don't allow this automatic dereferencing for
         * locals, since a store to a local should overwrite
         * anything there, including an object reference.
         *
         * If both Arg0 and Local0 contain RefOf (Local4):
         *
         * Store (1, Arg0)             - Causes indirect store to local4
         * Store (1, Local0)           - Stores 1 in local0, overwriting
         *                                  the reference to local4
         * Store (1, DeRefof (Local0)) - Causes indirect store to local4
         *
         * Weird, but true.
         */
        if (Type == ACPI_REFCLASS_ARG)
        {
            /*
             * If we have a valid reference object that came from RefOf(),
             * do the indirect store
             */
            if ((ACPI_GET_DESCRIPTOR_TYPE (CurrentObjDesc) == ACPI_DESC_TYPE_OPERAND) &&
                (CurrentObjDesc->Common.Type == ACPI_TYPE_LOCAL_REFERENCE) &&
                (CurrentObjDesc->Reference.Class == ACPI_REFCLASS_REFOF))
            {
                ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
                        "Arg (%p) is an ObjRef(Node), storing in node %p\n",
                        NewObjDesc, CurrentObjDesc));

                /*
                 * Store this object to the Node (perform the indirect store)
                 * NOTE: No implicit conversion is performed, as per the ACPI
                 * specification rules on storing to Locals/Args.
                 */
//.........这里部分代码省略.........

ACPI_STATUS
AcpiDsMethodDataGetValue (
    UINT8                   Type,
    UINT32                  Index,
    ACPI_WALK_STATE         *WalkState,
    ACPI_OPERAND_OBJECT     **DestDesc)
{
    ACPI_STATUS             Status;
    ACPI_NAMESPACE_NODE     *Node;
    ACPI_OPERAND_OBJECT     *Object;


    ACPI_FUNCTION_TRACE (DsMethodDataGetValue);


    /* Validate the object descriptor */

    if (!DestDesc)
    {
        ACPI_ERROR ((AE_INFO, "Null object descriptor pointer"));
        return_ACPI_STATUS (AE_BAD_PARAMETER);
    }

    /* Get the namespace node for the arg/local */

    Status = AcpiDsMethodDataGetNode (Type, Index, WalkState, &Node);
    if (ACPI_FAILURE (Status))
    {
        return_ACPI_STATUS (Status);
    }

    /* Get the object from the node */

    Object = Node->Object;

    /* Examine the returned object, it must be valid. */

    if (!Object)
    {
        /*
         * Index points to uninitialized object.
         * This means that either 1) The expected argument was
         * not passed to the method, or 2) A local variable
         * was referenced by the method (via the ASL)
         * before it was initialized.  Either case is an error.
         */

        /* If slack enabled, init the LocalX/ArgX to an Integer of value zero */

        if (AcpiGbl_EnableInterpreterSlack)
        {
            Object = AcpiUtCreateIntegerObject ((UINT64) 0);
            if (!Object)
            {
                return_ACPI_STATUS (AE_NO_MEMORY);
            }

            Node->Object = Object;
        }

        /* Otherwise, return the error */

        else switch (Type)
        {
        case ACPI_REFCLASS_ARG:

            ACPI_ERROR ((AE_INFO,
                "Uninitialized Arg[%u] at node %p",
                Index, Node));

            return_ACPI_STATUS (AE_AML_UNINITIALIZED_ARG);

        case ACPI_REFCLASS_LOCAL:

            /*
             * No error message for this case, will be trapped again later to
             * detect and ignore cases of Store(LocalX,LocalX)
             */
            return_ACPI_STATUS (AE_AML_UNINITIALIZED_LOCAL);

        default:

            ACPI_ERROR ((AE_INFO, "Not a Arg/Local opcode: 0x%X", Type));
            return_ACPI_STATUS (AE_AML_INTERNAL);
        }
    }

    /*
     * The Index points to an initialized and valid object.
     * Return an additional reference to the object
     */
    *DestDesc = Object;
    AcpiUtAddReference (Object);

    return_ACPI_STATUS (AE_OK);
}

//.........这里部分代码省略.........
            }
            break;


        case AML_TYPE_LITERAL:

            ObjDesc->Integer.Value = Op->Common.Value.Integer;
#ifndef ACPI_NO_METHOD_EXECUTION
            AcpiExTruncateFor32bitTable (ObjDesc);
#endif
            break;


        default:
            ACPI_ERROR ((AE_INFO, "Unknown Integer type %X",
                OpInfo->Type));
            Status = AE_AML_OPERAND_TYPE;
            break;
        }
        break;


    case ACPI_TYPE_STRING:

        ObjDesc->String.Pointer = Op->Common.Value.String;
        ObjDesc->String.Length = (UINT32) ACPI_STRLEN (Op->Common.Value.String);

        /*
         * The string is contained in the ACPI table, don't ever try
         * to delete it
         */
        ObjDesc->Common.Flags |= AOPOBJ_STATIC_POINTER;
        break;


    case ACPI_TYPE_METHOD:
        break;


    case ACPI_TYPE_LOCAL_REFERENCE:

        switch (OpInfo->Type)
        {
        case AML_TYPE_LOCAL_VARIABLE:

            /* Split the opcode into a base opcode + offset */

            ObjDesc->Reference.Opcode = AML_LOCAL_OP;
            ObjDesc->Reference.Offset = Opcode - AML_LOCAL_OP;

#ifndef ACPI_NO_METHOD_EXECUTION
            Status = AcpiDsMethodDataGetNode (AML_LOCAL_OP,
                        ObjDesc->Reference.Offset,
                        WalkState,
                        (ACPI_NAMESPACE_NODE **) &ObjDesc->Reference.Object);
#endif
            break;


        case AML_TYPE_METHOD_ARGUMENT:

            /* Split the opcode into a base opcode + offset */

            ObjDesc->Reference.Opcode = AML_ARG_OP;
            ObjDesc->Reference.Offset = Opcode - AML_ARG_OP;

#ifndef ACPI_NO_METHOD_EXECUTION
            Status = AcpiDsMethodDataGetNode (AML_ARG_OP,
                        ObjDesc->Reference.Offset,
                        WalkState,
                        (ACPI_NAMESPACE_NODE **) &ObjDesc->Reference.Object);
#endif
            break;

        default: /* Other literals, etc.. */

            if (Op->Common.AmlOpcode == AML_INT_NAMEPATH_OP)
            {
                /* Node was saved in Op */

                ObjDesc->Reference.Node = Op->Common.Node;
            }

            ObjDesc->Reference.Opcode = Opcode;
            break;
        }
        break;


    default:

        ACPI_ERROR ((AE_INFO, "Unimplemented data type: %X",
            ACPI_GET_OBJECT_TYPE (ObjDesc)));

        Status = AE_AML_OPERAND_TYPE;
        break;
    }

    return_ACPI_STATUS (Status);
}