exresolv.c

acpi tools for linux include acpiexec and acpixtract

                ACPI_ERROR ((AE_INFO,
                    "Unknown TargetType %X in Index/Reference object %p",
                    StackDesc->Reference.TargetType, StackDesc));
                Status = AE_AML_INTERNAL;
                break;
            }
            break;


        case AML_REF_OF_OP:
        case AML_DEBUG_OP:
        case AML_LOAD_OP:

            /* Just leave the object as-is, do not dereference */

            break;

        case AML_INT_NAMEPATH_OP:   /* Reference to a named object */

            /* Dereference the name */

            if ((StackDesc->Reference.Node->Type == ACPI_TYPE_DEVICE) ||
                (StackDesc->Reference.Node->Type == ACPI_TYPE_THERMAL))
            {
                /* These node types do not have 'real' subobjects */

                *StackPtr = (void *) StackDesc->Reference.Node;
            }
            else
            {
                /* Get the object pointed to by the namespace node */

                *StackPtr = (StackDesc->Reference.Node)->Object;
                AcpiUtAddReference (*StackPtr);
            }

            AcpiUtRemoveReference (StackDesc);
            break;

        default:

            ACPI_ERROR ((AE_INFO,
                "Unknown Reference opcode %X (%s) in %p",
                Opcode, AcpiPsGetOpcodeName (Opcode), StackDesc));
            Status = AE_AML_INTERNAL;
            break;
        }
        break;


    case ACPI_TYPE_BUFFER:

        Status = AcpiDsGetBufferArguments (StackDesc);
        break;


    case ACPI_TYPE_PACKAGE:

        Status = AcpiDsGetPackageArguments (StackDesc);
        break;


    case ACPI_TYPE_BUFFER_FIELD:
    case ACPI_TYPE_LOCAL_REGION_FIELD:
    case ACPI_TYPE_LOCAL_BANK_FIELD:
    case ACPI_TYPE_LOCAL_INDEX_FIELD:

        ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "FieldRead SourceDesc=%p Type=%X\n",
            StackDesc, ACPI_GET_OBJECT_TYPE (StackDesc)));

        Status = AcpiExReadDataFromField (WalkState, StackDesc, &ObjDesc);

        /* Remove a reference to the original operand, then override */

        AcpiUtRemoveReference (*StackPtr);
        *StackPtr = (void *) ObjDesc;
        break;

    default:
        break;
    }

    return_ACPI_STATUS (Status);
}


/*******************************************************************************
 *
 * 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.
 *
 ******************************************************************************/

ACPI_STATUS
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;


    ACPI_FUNCTION_TRACE (AcpiExResolveMultiple);


    /* Operand can be either a namespace node or an operand descriptor */

    switch (ACPI_GET_DESCRIPTOR_TYPE (ObjDesc))
    {
    case ACPI_DESC_TYPE_OPERAND:
        Type = ObjDesc->Common.Type;
        break;

    case ACPI_DESC_TYPE_NAMED:
        Type = ((ACPI_NAMESPACE_NODE *) ObjDesc)->Type;
        ObjDesc = AcpiNsGetAttachedObject ((ACPI_NAMESPACE_NODE *) ObjDesc);

        /* If we had an Alias node, use the attached object for type info */

        if (Type == ACPI_TYPE_LOCAL_ALIAS)
        {
            Type = ((ACPI_NAMESPACE_NODE *) ObjDesc)->Type;
            ObjDesc = AcpiNsGetAttachedObject ((ACPI_NAMESPACE_NODE *) ObjDesc);
        }
        break;

    default:
        return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
    }

    /* If type is anything other than a reference, we are done */

    if (Type != ACPI_TYPE_LOCAL_REFERENCE)
    {
        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 (ACPI_GET_OBJECT_TYPE (ObjDesc) == ACPI_TYPE_LOCAL_REFERENCE)
    {
        switch (ObjDesc->Reference.Opcode)
        {
        case AML_REF_OF_OP:
        case AML_INT_NAMEPATH_OP:

            /* Dereference the reference pointer */

            if (ObjDesc->Reference.Opcode == AML_REF_OF_OP)
            {
                Node = ObjDesc->Reference.Object;
            }
            else /* AML_INT_NAMEPATH_OP */
            {
                Node = ObjDesc->Reference.Node;
            }

            /* All "References" point to a NS node */

            if (ACPI_GET_DESCRIPTOR_TYPE (Node) != ACPI_DESC_TYPE_NAMED)
            {
                ACPI_ERROR ((AE_INFO,
                    "Not a NS node %p [%s]",
                    Node, AcpiUtGetDescriptorName (Node)));
                return_ACPI_STATUS (AE_AML_INTERNAL);
            }

            /* Get the attached object */

            ObjDesc = AcpiNsGetAttachedObject (Node);
            if (!ObjDesc)
            {
                /* No object, use the NS node type */

                Type = AcpiNsGetType (Node);
                goto Exit;
            }

            /* Check for circular references */

            if (ObjDesc == Operand)
            {
                return_ACPI_STATUS (AE_AML_CIRCULAR_REFERENCE);
            }
            break;


        case AML_INDEX_OP:

            /* Get the type of this reference (index into another object) */

            Type = ObjDesc->Reference.TargetType;
            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 */

                Type = 0; /* Uninitialized */
                goto Exit;
            }
            break;


        case AML_LOAD_OP:

            Type = ACPI_TYPE_DDB_HANDLE;
            goto Exit;


        case AML_LOCAL_OP:
        case AML_ARG_OP:

            if (ReturnDesc)
            {
                Status = AcpiDsMethodDataGetValue (ObjDesc->Reference.Opcode,
                            ObjDesc->Reference.Offset, WalkState, &ObjDesc);
                if (ACPI_FAILURE (Status))
                {
                    return_ACPI_STATUS (Status);
                }
                AcpiUtRemoveReference (ObjDesc);
            }
            else
            {
                Status = AcpiDsMethodDataGetNode (ObjDesc->Reference.Opcode,
                            ObjDesc->Reference.Offset, WalkState, &Node);
                if (ACPI_FAILURE (Status))
                {
                    return_ACPI_STATUS (Status);
                }

                ObjDesc = AcpiNsGetAttachedObject (Node);
                if (!ObjDesc)
                {
                    Type = ACPI_TYPE_ANY;
                    goto Exit;
                }
            }
            break;


        case AML_DEBUG_OP:

            /* The Debug Object is of type "DebugObject" */

            Type = ACPI_TYPE_DEBUG_OBJECT;
            goto Exit;


        default:

            ACPI_ERROR ((AE_INFO,
                "Unknown Reference subtype %X",
                ObjDesc->Reference.Opcode));
            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 = ACPI_GET_OBJECT_TYPE (ObjDesc);


Exit:
    /* Convert internal types to external types */

    switch (Type)
    {
    case ACPI_TYPE_LOCAL_REGION_FIELD:
    case ACPI_TYPE_LOCAL_BANK_FIELD:
    case ACPI_TYPE_LOCAL_INDEX_FIELD:

        Type = ACPI_TYPE_FIELD_UNIT;
        break;

    case ACPI_TYPE_LOCAL_SCOPE:

        /* Per ACPI Specification, Scope is untyped */

        Type = ACPI_TYPE_ANY;
        break;

    default:
        /* No change to Type required */
        break;
    }

    *ReturnType = Type;
    if (ReturnDesc)
    {
        *ReturnDesc = ObjDesc;
    }
    return_ACPI_STATUS (AE_OK);
}