exstore.c

acpi tools for linux include acpiexec and acpixtract

    default:

        /* Destination is not a Reference object */

        ACPI_ERROR ((AE_INFO,
            "Target is not a Reference or Constant object - %s [%p]",
            AcpiUtGetObjectTypeName (DestDesc), DestDesc));

        ACPI_DUMP_STACK_ENTRY (SourceDesc);
        ACPI_DUMP_STACK_ENTRY (DestDesc);
        ACPI_DUMP_OPERANDS (&DestDesc, ACPI_IMODE_EXECUTE, "ExStore",
                        2, "Target is not a Reference or Constant object");

        return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
    }

    /*
     * Examine the Reference opcode.  These cases are handled:
     *
     * 1) Store to Name (Change the object associated with a name)
     * 2) Store to an indexed area of a Buffer or Package
     * 3) Store to a Method Local or Arg
     * 4) Store to the debug object
     */
    switch (RefDesc->Reference.Opcode)
    {
    case AML_REF_OF_OP:

        /* Storing an object into a Name "container" */

        Status = AcpiExStoreObjectToNode (SourceDesc,
                    RefDesc->Reference.Object,
                    WalkState, ACPI_IMPLICIT_CONVERSION);
        break;


    case AML_INDEX_OP:

        /* Storing to an Index (pointer into a packager or buffer) */

        Status = AcpiExStoreObjectToIndex (SourceDesc, RefDesc, WalkState);
        break;


    case AML_LOCAL_OP:
    case AML_ARG_OP:

        /* Store to a method local/arg  */

        Status = AcpiDsStoreObjectToLocal (RefDesc->Reference.Opcode,
                    RefDesc->Reference.Offset, SourceDesc, WalkState);
        break;


    case AML_DEBUG_OP:

        /*
         * Storing to the Debug object causes the value stored to be
         * displayed and otherwise has no effect -- see ACPI Specification
         */
        ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
            "**** Write to Debug Object: Object %p %s ****:\n\n",
            SourceDesc, AcpiUtGetObjectTypeName (SourceDesc)));

        AcpiExDoDebugObject (SourceDesc, 0, 0);
        break;


    default:

        ACPI_ERROR ((AE_INFO, "Unknown Reference opcode %X",
            RefDesc->Reference.Opcode));
        ACPI_DUMP_ENTRY (RefDesc, ACPI_LV_ERROR);

        Status = AE_AML_INTERNAL;
        break;
    }

    return_ACPI_STATUS (Status);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiExStoreObjectToIndex
 *
 * PARAMETERS:  *SourceDesc             - Value to be stored
 *              *DestDesc               - Named object to receive the value
 *              WalkState               - Current walk state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Store the object to indexed Buffer or Package element
 *
 ******************************************************************************/

static ACPI_STATUS
AcpiExStoreObjectToIndex (
    ACPI_OPERAND_OBJECT     *SourceDesc,
    ACPI_OPERAND_OBJECT     *IndexDesc,
    ACPI_WALK_STATE         *WalkState)
{
    ACPI_STATUS             Status = AE_OK;
    ACPI_OPERAND_OBJECT     *ObjDesc;
    ACPI_OPERAND_OBJECT     *NewDesc;
    UINT8                   Value = 0;
    UINT32                  i;


    ACPI_FUNCTION_TRACE (ExStoreObjectToIndex);


    /*
     * Destination must be a reference pointer, and
     * must point to either a buffer or a package
     */
    switch (IndexDesc->Reference.TargetType)
    {
    case ACPI_TYPE_PACKAGE:
        /*
         * Storing to a package element. Copy the object and replace
         * any existing object with the new object. No implicit
         * conversion is performed.
         *
         * The object at *(IndexDesc->Reference.Where) is the
         * element within the package that is to be modified.
         * The parent package object is at IndexDesc->Reference.Object
         */
        ObjDesc = *(IndexDesc->Reference.Where);

        if (ACPI_GET_OBJECT_TYPE (SourceDesc) == ACPI_TYPE_LOCAL_REFERENCE &&
            SourceDesc->Reference.Opcode == AML_LOAD_OP)
        {
            /* This is a DDBHandle, just add a reference to it */

            AcpiUtAddReference (SourceDesc);
            NewDesc = SourceDesc;
        }
        else
        {
            /* Normal object, copy it */

            Status = AcpiUtCopyIobjectToIobject (SourceDesc, &NewDesc, WalkState);
            if (ACPI_FAILURE (Status))
            {
                return_ACPI_STATUS (Status);
            }
        }

        if (ObjDesc)
        {
            /* Decrement reference count by the ref count of the parent package */

            for (i = 0;
                 i < ((ACPI_OPERAND_OBJECT *)
                        IndexDesc->Reference.Object)->Common.ReferenceCount;
                 i++)
            {
                AcpiUtRemoveReference (ObjDesc);
            }
        }

        *(IndexDesc->Reference.Where) = NewDesc;

        /* Increment ref count by the ref count of the parent package-1 */

        for (i = 1;
             i < ((ACPI_OPERAND_OBJECT *)
                    IndexDesc->Reference.Object)->Common.ReferenceCount;
             i++)
        {
            AcpiUtAddReference (NewDesc);
        }

        break;


    case ACPI_TYPE_BUFFER_FIELD:

        /*
         * Store into a Buffer or String (not actually a real BufferField)
         * at a location defined by an Index.
         *
         * The first 8-bit element of the source object is written to the
         * 8-bit Buffer location defined by the Index destination object,
         * according to the ACPI 2.0 specification.
         */

        /*
         * Make sure the target is a Buffer or String. An error should
         * not happen here, since the ReferenceObject was constructed
         * by the INDEX_OP code.
         */
        ObjDesc = IndexDesc->Reference.Object;
        if ((ACPI_GET_OBJECT_TYPE (ObjDesc) != ACPI_TYPE_BUFFER) &&
            (ACPI_GET_OBJECT_TYPE (ObjDesc) != ACPI_TYPE_STRING))
        {
            return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
        }

        /*
         * The assignment of the individual elements will be slightly
         * different for each source type.
         */
        switch (ACPI_GET_OBJECT_TYPE (SourceDesc))
        {
        case ACPI_TYPE_INTEGER:

            /* Use the least-significant byte of the integer */

            Value = (UINT8) (SourceDesc->Integer.Value);
            break;

        case ACPI_TYPE_BUFFER:
        case ACPI_TYPE_STRING:

            /* Note: Takes advantage of common string/buffer fields */

            Value = SourceDesc->Buffer.Pointer[0];
            break;

        default:

            /* All other types are invalid */

            ACPI_ERROR ((AE_INFO,
                "Source must be Integer/Buffer/String type, not %s",
                AcpiUtGetObjectTypeName (SourceDesc)));
            return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
        }

        /* Store the source value into the target buffer byte */

        ObjDesc->Buffer.Pointer[IndexDesc->Reference.Offset] = Value;
        break;


    default:
        ACPI_ERROR ((AE_INFO,
            "Target is not a Package or BufferField"));
        Status = AE_AML_OPERAND_TYPE;
        break;
    }

    return_ACPI_STATUS (Status);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiExStoreObjectToNode
 *
 * PARAMETERS:  SourceDesc              - Value to be stored
 *              Node                    - Named object to receive the value
 *              WalkState               - Current walk state
 *              ImplicitConversion      - Perform implicit conversion (yes/no)
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Store the object to the named object.
 *
 *              The Assignment of an object to a named object is handled here
 *              The value passed in will replace the current value (if any)
 *              with the input value.
 *
 *              When storing into an object the data is converted to the
 *              target object type then stored in the object.  This means
 *              that the target object type (for an initialized target) will
 *              not be changed by a store operation.
 *
 *              Assumes parameters are already validated.
 *
 ******************************************************************************/

ACPI_STATUS
AcpiExStoreObjectToNode (
    ACPI_OPERAND_OBJECT     *SourceDesc,
    ACPI_NAMESPACE_NODE     *Node,
    ACPI_WALK_STATE         *WalkState,
    UINT8                   ImplicitConversion)
{
    ACPI_STATUS             Status = AE_OK;
    ACPI_OPERAND_OBJECT     *TargetDesc;
    ACPI_OPERAND_OBJECT     *NewDesc;
    ACPI_OBJECT_TYPE        TargetType;


    ACPI_FUNCTION_TRACE_PTR (ExStoreObjectToNode, SourceDesc);


    /* Get current type of the node, and object attached to Node */

    TargetType = AcpiNsGetType (Node);
    TargetDesc = AcpiNsGetAttachedObject (Node);

    ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Storing %p(%s) into node %p(%s)\n",
        SourceDesc, AcpiUtGetObjectTypeName (SourceDesc),
              Node, AcpiUtGetTypeName (TargetType)));

    /*
     * Resolve the source object to an actual value
     * (If it is a reference object)
     */
    Status = AcpiExResolveObject (&SourceDesc, TargetType, WalkState);
    if (ACPI_FAILURE (Status))
    {
        return_ACPI_STATUS (Status);
    }

    /* If no implicit conversion, drop into the default case below */

    if ((!ImplicitConversion) || 
          ((WalkState->Opcode == AML_COPY_OP) &&
           (TargetType != ACPI_TYPE_LOCAL_REGION_FIELD) &&
           (TargetType != ACPI_TYPE_LOCAL_BANK_FIELD) &&
           (TargetType != ACPI_TYPE_LOCAL_INDEX_FIELD)))
    {
        /*
         * Force execution of default (no implicit conversion). Note:
         * CopyObject does not perform an implicit conversion, as per the ACPI
         * spec -- except in case of region/bank/index fields -- because these
         * objects must retain their original type permanently.
         */
        TargetType = ACPI_TYPE_ANY;
    }

    /* Do the actual store operation */

    switch (TargetType)
    {
    case ACPI_TYPE_BUFFER_FIELD:
    case ACPI_TYPE_LOCAL_REGION_FIELD:
    case ACPI_TYPE_LOCAL_BANK_FIELD:
    case ACPI_TYPE_LOCAL_INDEX_FIELD:

        /* For fields, copy the source data to the target field. */

        Status = AcpiExWriteDataToField (SourceDesc, TargetDesc,
                    &WalkState->ResultObj);
        break;


    case ACPI_TYPE_INTEGER:
    case ACPI_TYPE_STRING:
    case ACPI_TYPE_BUFFER:

        /*
         * These target types are all of type Integer/String/Buffer, and
         * therefore support implicit conversion before the store.
         *
         * Copy and/or convert the source object to a new target object
         */
        Status = AcpiExStoreObjectToObject (SourceDesc, TargetDesc,
                    &NewDesc, WalkState);
        if (ACPI_FAILURE (Status))
        {
            return_ACPI_STATUS (Status);
        }

        if (NewDesc != TargetDesc)
        {
            /*
             * Store the new NewDesc as the new value of the Name, and set
             * the Name's type to that of the value being stored in it.
             * SourceDesc reference count is incremented by AttachObject.
             *
             * Note: This may change the type of the node if an explicit store
             * has been performed such that the node/object type has been
             * changed.
             */
            Status = AcpiNsAttachObject (Node, NewDesc, NewDesc->Common.Type);

            ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
                "Store %s into %s via Convert/Attach\n",
                AcpiUtGetObjectTypeName (SourceDesc),
                AcpiUtGetObjectTypeName (NewDesc)));
        }
        break;


    default:

        ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
            "Storing %s (%p) directly into node (%p) with no implicit conversion\n",
            AcpiUtGetObjectTypeName (SourceDesc), SourceDesc, Node));

        /* No conversions for all other types.  Just attach the source object */

        Status = AcpiNsAttachObject (Node, SourceDesc,
                    ACPI_GET_OBJECT_TYPE (SourceDesc));
        break;
    }

    return_ACPI_STATUS (Status);
}