dsmthdat.c

acpi tools for linux include acpiexec and acpixtract

    ACPI_STATUS             Status;
    ACPI_NAMESPACE_NODE     *Node;


    ACPI_FUNCTION_TRACE (DsMethodDataSetValue);


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

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

    Status = AcpiDsMethodDataGetNode (Opcode, 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);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiDsMethodDataGetValue
 *
 * PARAMETERS:  Opcode              - Either AML_LOCAL_OP or AML_ARG_OP
 *              Index               - Which localVar or argument to get
 *              WalkState           - Current walk state object
 *              DestDesc            - Where Arg or Local value is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Retrieve value of selected Arg or Local for this method
 *              Used only in AcpiExResolveToValue().
 *
 ******************************************************************************/

ACPI_STATUS
AcpiDsMethodDataGetValue (
    UINT16                  Opcode,
    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 (Opcode, 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 = AcpiUtCreateInternalObject (ACPI_TYPE_INTEGER);
            if (!Object)
            {
                return_ACPI_STATUS (AE_NO_MEMORY);
            }

            Object->Integer.Value = 0;
            Node->Object = Object;
        }

        /* Otherwise, return the error */

        else switch (Opcode)
        {
        case AML_ARG_OP:

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

            return_ACPI_STATUS (AE_AML_UNINITIALIZED_ARG);

        case AML_LOCAL_OP:

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

            return_ACPI_STATUS (AE_AML_UNINITIALIZED_LOCAL);

        default:
            ACPI_ERROR ((AE_INFO, "Not a Arg/Local opcode: %X", Opcode));
            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);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiDsMethodDataDeleteValue
 *
 * PARAMETERS:  Opcode              - Either AML_LOCAL_OP or AML_ARG_OP
 *              Index               - Which localVar or argument to delete
 *              WalkState           - Current walk state object
 *
 * RETURN:      None
 *
 * DESCRIPTION: Delete the entry at Opcode:Index.  Inserts
 *              a null into the stack slot after the object is deleted.
 *
 ******************************************************************************/

static void
AcpiDsMethodDataDeleteValue (
    UINT16                  Opcode,
    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 (Opcode, 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;
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiDsStoreObjectToLocal
 *
 * PARAMETERS:  Opcode              - Either AML_LOCAL_OP or AML_ARG_OP
 *              Index               - Which Local or Arg to set
 *              ObjDesc             - Value to be stored
 *              WalkState           - Current walk state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Store a value in an Arg or Local.  The ObjDesc is installed
 *              as the new value for the Arg or Local and the reference count
 *              for ObjDesc is incremented.
 *
 ******************************************************************************/

ACPI_STATUS
AcpiDsStoreObjectToLocal (
    UINT16                  Opcode,
    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, "Opcode=%X Index=%d Obj=%p\n",
        Opcode, Index, ObjDesc));

    /* Parameter validation */

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

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

    Status = AcpiDsMethodDataGetNode (Opcode, 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 (Opcode == AML_ARG_OP)
        {
            /*
             * 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.Opcode == AML_REF_OF_OP))
            {
                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.
                 */
                Status = AcpiExStoreObjectToNode (NewObjDesc,
                            CurrentObjDesc->Reference.Object, WalkState,
                            ACPI_NO_IMPLICIT_CONVERSION);

                /* Remove local reference if we copied the object above */

                if (NewObjDesc != ObjDesc)
                {
                    AcpiUtRemoveReference (NewObjDesc);
                }
                return_ACPI_STATUS (Status);
            }
        }

        /*
         * Delete the existing object
         * before storing the new one
         */
        AcpiDsMethodDataDeleteValue (Opcode, Index, WalkState);
    }

    /*
     * Install the Obj descriptor (*NewObjDesc) into
     * the descriptor for the Arg or Local.
     * (increments the object reference count by one)
     */
    Status = AcpiDsMethodDataSetValue (Opcode, Index, NewObjDesc, WalkState);

    /* Remove local reference if we copied the object above */

    if (NewObjDesc != ObjDesc)
    {
        AcpiUtRemoveReference (NewObjDesc);
    }

    return_ACPI_STATUS (Status);
}


#ifdef ACPI_OBSOLETE_FUNCTIONS
/*******************************************************************************
 *
 * FUNCTION:    AcpiDsMethodDataGetType
 *
 * PARAMETERS:  Opcode              - Either AML_LOCAL_OP or AML_ARG_OP
 *              Index               - Which Local or Arg whose type to get
 *              WalkState           - Current walk state object
 *
 * RETURN:      Data type of current value of the selected Arg or Local
 *
 * DESCRIPTION: Get the type of the object stored in the Local or Arg
 *
 ******************************************************************************/

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 (ACPI_GET_OBJECT_TYPE (Object));
}
#endif