ACPI_STATUS AcpiNsEvaluate ( ACPI_EVALUATE_INFO * Info )
Definition at line 165 of file nseval.c.
Referenced by AcpiEvaluateObject(), AcpiEvAsynchExecuteGpeMethod(), AcpiEvExecuteRegMethod(), AcpiGetSleepTypeData(), AcpiNsExecModuleCode(), AcpiNsInitializeDevices(), AcpiNsInitOneDevice(), AcpiRsSetSrsMethodData(), and AcpiUtEvaluateObject().
{
    ACPI_STATUS             Status;
    ACPI_NAMESPACE_NODE     *Node;


    ACPI_FUNCTION_TRACE (NsEvaluate);


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

    /* Initialize the return value to an invalid object */

    Info->ReturnObject = NULL;
    Info->ParamCount = 0;

    /*
     * Get the actual namespace node for the target object. Handles these cases:
     *
     * 1) Null node, Pathname (absolute path)
     * 2) Node, Pathname (path relative to Node)
     * 3) Node, Null Pathname
     */
    Status = AcpiNsGetNode (Info->PrefixNode, Info->Pathname,
                ACPI_NS_NO_UPSEARCH, &Info->ResolvedNode);
    if (ACPI_FAILURE (Status))
    {
        return_ACPI_STATUS (Status);
    }

    /*
     * For a method alias, we must grab the actual method node so that proper
     * scoping context will be established before execution.
     */
    if (AcpiNsGetType (Info->ResolvedNode) == ACPI_TYPE_LOCAL_METHOD_ALIAS)
    {
        Info->ResolvedNode =
            ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, Info->ResolvedNode->Object);
    }

    ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "%s [%p] Value %p\n", Info->Pathname,
        Info->ResolvedNode, AcpiNsGetAttachedObject (Info->ResolvedNode)));

    Node = Info->ResolvedNode;

    /*
     * Two major cases here:
     *
     * 1) The object is a control method -- execute it
     * 2) The object is not a method -- just return it's current value
     */
    if (AcpiNsGetType (Info->ResolvedNode) == ACPI_TYPE_METHOD)
    {
        /*
         * 1) Object is a control method - execute it
         */

        /* Verify that there is a method object associated with this node */

        Info->ObjDesc = AcpiNsGetAttachedObject (Info->ResolvedNode);
        if (!Info->ObjDesc)
        {
            ACPI_ERROR ((AE_INFO, "Control method has no attached sub-object"));
            return_ACPI_STATUS (AE_NULL_OBJECT);
        }

        /* Count the number of arguments being passed to the method */

        if (Info->Parameters)
        {
            while (Info->Parameters[Info->ParamCount])
            {
                if (Info->ParamCount > ACPI_METHOD_MAX_ARG)
                {
                    return_ACPI_STATUS (AE_LIMIT);
                }
                Info->ParamCount++;
            }
        }

        ACPI_DUMP_PATHNAME (Info->ResolvedNode, "ACPI: Execute Method",
            ACPI_LV_INFO, _COMPONENT);

        ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
            "Method at AML address %p Length %X\n",
            Info->ObjDesc->Method.AmlStart + 1,
            Info->ObjDesc->Method.AmlLength - 1));

        /*
         * Any namespace deletion must acquire both the namespace and
         * interpreter locks to ensure that no thread is using the portion of
         * the namespace that is being deleted.
         *
         * Execute the method via the interpreter. The interpreter is locked
         * here before calling into the AML parser
         */
        AcpiExEnterInterpreter ();
        Status = AcpiPsExecuteMethod (Info);
        AcpiExExitInterpreter ();
    }
    else
    {
        /*
         * 2) Object is not a method, return its current value
         *
         * Disallow certain object types. For these, "evaluation" is undefined.
         */
        switch (Info->ResolvedNode->Type)
        {
        case ACPI_TYPE_DEVICE:
        case ACPI_TYPE_EVENT:
        case ACPI_TYPE_MUTEX:
        case ACPI_TYPE_REGION:
        case ACPI_TYPE_THERMAL:
        case ACPI_TYPE_LOCAL_SCOPE:

            ACPI_ERROR ((AE_INFO,
                "[%4.4s] Evaluation of object type [%s] is not supported",
                Info->ResolvedNode->Name.Ascii,
                AcpiUtGetTypeName (Info->ResolvedNode->Type)));

            return_ACPI_STATUS (AE_TYPE);

        default:
            break;
        }

        /*
         * Objects require additional resolution steps (e.g., the Node may be
         * a field that must be read, etc.) -- we can't just grab the object
         * out of the node.
         *
         * Use ResolveNodeToValue() to get the associated value.
         *
         * NOTE: we can get away with passing in NULL for a walk state because
         * ResolvedNode is guaranteed to not be a reference to either a method
         * local or a method argument (because this interface is never called
         * from a running method.)
         *
         * Even though we do not directly invoke the interpreter for object
         * resolution, we must lock it because we could access an opregion.
         * The opregion access code assumes that the interpreter is locked.
         */
        AcpiExEnterInterpreter ();

        /* Function has a strange interface */

        Status = AcpiExResolveNodeToValue (&Info->ResolvedNode, NULL);
        AcpiExExitInterpreter ();

        /*
         * If AcpiExResolveNodeToValue() succeeded, the return value was placed
         * in ResolvedNode.
         */
        if (ACPI_SUCCESS (Status))
        {
            Status = AE_CTRL_RETURN_VALUE;
            Info->ReturnObject =
                ACPI_CAST_PTR (ACPI_OPERAND_OBJECT, Info->ResolvedNode);

            ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "Returning object %p [%s]\n",
                Info->ReturnObject,
                AcpiUtGetObjectTypeName (Info->ReturnObject)));
        }
    }

    /*
     * Check input argument count against the ASL-defined count for a method.
     * Also check predefined names: argument count and return value against
     * the ACPI specification. Some incorrect return value types are repaired.
     */
    (void) AcpiNsCheckPredefinedNames (Node, Info->ParamCount,
                Status, &Info->ReturnObject);

    /* Check if there is a return value that must be dealt with */

    if (Status == AE_CTRL_RETURN_VALUE)
    {
        /* If caller does not want the return value, delete it */

        if (Info->Flags & ACPI_IGNORE_RETURN_VALUE)
        {
            AcpiUtRemoveReference (Info->ReturnObject);
            Info->ReturnObject = NULL;
        }

        /* Map AE_CTRL_RETURN_VALUE to AE_OK, we are done with it */

        Status = AE_OK;
    }

    ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
        "*** Completed evaluation of object %s ***\n", Info->Pathname));

    /*
     * Namespace was unlocked by the handling AcpiNs* function, so we
     * just return
     */
    return_ACPI_STATUS (Status);
}
ReactOS Development > Doxygen
