evregion.c

acpi tools for linux include acpiexec and acpixtract

        while (NextHandlerObj)
        {
            /* Found a handler, is it for the same address space? */

            if (NextHandlerObj->AddressSpace.SpaceId == HandlerObj->AddressSpace.SpaceId)
            {
                ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
                    "Found handler for region [%s] in device %p(%p) handler %p\n",
                    AcpiUtGetRegionName (HandlerObj->AddressSpace.SpaceId),
                    ObjDesc, NextHandlerObj, HandlerObj));

                /*
                 * Since the object we found it on was a device, then it
                 * means that someone has already installed a handler for
                 * the branch of the namespace from this device on.  Just
                 * bail out telling the walk routine to not traverse this
                 * branch.  This preserves the scoping rule for handlers.
                 */
                return (AE_CTRL_DEPTH);
            }

            /* Walk the linked list of handlers attached to this device */

            NextHandlerObj = NextHandlerObj->AddressSpace.Next;
        }

        /*
         * As long as the device didn't have a handler for this
         * space we don't care about it.  We just ignore it and
         * proceed.
         */
        return (AE_OK);
    }

    /* Object is a Region */

    if (ObjDesc->Region.SpaceId != HandlerObj->AddressSpace.SpaceId)
    {
        /*
         * This region is for a different address space
         * -- just ignore it
         */
        return (AE_OK);
    }

    /*
     * Now we have a region and it is for the handler's address
     * space type.
     *
     * First disconnect region for any previous handler (if any)
     */
    AcpiEvDetachRegion (ObjDesc, FALSE);

    /* Connect the region to the new handler */

    Status = AcpiEvAttachRegion (HandlerObj, ObjDesc, FALSE);
    return (Status);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiEvInstallSpaceHandler
 *
 * PARAMETERS:  Node            - Namespace node for the device
 *              SpaceId         - The address space ID
 *              Handler         - Address of the handler
 *              Setup           - Address of the setup function
 *              Context         - Value passed to the handler on each access
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Install a handler for all OpRegions of a given SpaceId.
 *              Assumes namespace is locked
 *
 ******************************************************************************/

ACPI_STATUS
AcpiEvInstallSpaceHandler (
    ACPI_NAMESPACE_NODE     *Node,
    ACPI_ADR_SPACE_TYPE     SpaceId,
    ACPI_ADR_SPACE_HANDLER  Handler,
    ACPI_ADR_SPACE_SETUP    Setup,
    void                    *Context)
{
    ACPI_OPERAND_OBJECT     *ObjDesc;
    ACPI_OPERAND_OBJECT     *HandlerObj;
    ACPI_STATUS             Status;
    ACPI_OBJECT_TYPE        Type;
    UINT8                  Flags = 0;


    ACPI_FUNCTION_TRACE (EvInstallSpaceHandler);


    /*
     * This registration is valid for only the types below
     * and the root.  This is where the default handlers
     * get placed.
     */
    if ((Node->Type != ACPI_TYPE_DEVICE)     &&
        (Node->Type != ACPI_TYPE_PROCESSOR)  &&
        (Node->Type != ACPI_TYPE_THERMAL)    &&
        (Node != AcpiGbl_RootNode))
    {
        Status = AE_BAD_PARAMETER;
        goto UnlockAndExit;
    }

    if (Handler == ACPI_DEFAULT_HANDLER)
    {
        Flags = ACPI_ADDR_HANDLER_DEFAULT_INSTALLED;

        switch (SpaceId)
        {
        case ACPI_ADR_SPACE_SYSTEM_MEMORY:
            Handler = AcpiExSystemMemorySpaceHandler;
            Setup   = AcpiEvSystemMemoryRegionSetup;
            break;

        case ACPI_ADR_SPACE_SYSTEM_IO:
            Handler = AcpiExSystemIoSpaceHandler;
            Setup   = AcpiEvIoSpaceRegionSetup;
            break;

        case ACPI_ADR_SPACE_PCI_CONFIG:
            Handler = AcpiExPciConfigSpaceHandler;
            Setup   = AcpiEvPciConfigRegionSetup;
            break;

        case ACPI_ADR_SPACE_CMOS:
            Handler = AcpiExCmosSpaceHandler;
            Setup   = AcpiEvCmosRegionSetup;
            break;

        case ACPI_ADR_SPACE_PCI_BAR_TARGET:
            Handler = AcpiExPciBarSpaceHandler;
            Setup   = AcpiEvPciBarRegionSetup;
            break;

        case ACPI_ADR_SPACE_DATA_TABLE:
            Handler = AcpiExDataTableSpaceHandler;
            Setup   = NULL;
            break;

        default:
            Status = AE_BAD_PARAMETER;
            goto UnlockAndExit;
        }
    }

    /* If the caller hasn't specified a setup routine, use the default */

    if (!Setup)
    {
        Setup = AcpiEvDefaultRegionSetup;
    }

    /* Check for an existing internal object */

    ObjDesc = AcpiNsGetAttachedObject (Node);
    if (ObjDesc)
    {
        /*
         * The attached device object already exists.
         * Make sure the handler is not already installed.
         */
        HandlerObj = ObjDesc->Device.Handler;

        /* Walk the handler list for this device */

        while (HandlerObj)
        {
            /* Same SpaceId indicates a handler already installed */

            if (HandlerObj->AddressSpace.SpaceId == SpaceId)
            {
                if (HandlerObj->AddressSpace.Handler == Handler)
                {
                    /*
                     * It is (relatively) OK to attempt to install the SAME
                     * handler twice. This can easily happen
                     * with PCI_Config space.
                     */
                    Status = AE_SAME_HANDLER;
                    goto UnlockAndExit;
                }
                else
                {
                    /* A handler is already installed */

                    Status = AE_ALREADY_EXISTS;
                }
                goto UnlockAndExit;
            }

            /* Walk the linked list of handlers */

            HandlerObj = HandlerObj->AddressSpace.Next;
        }
    }
    else
    {
        ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
            "Creating object on Device %p while installing handler\n", Node));

        /* ObjDesc does not exist, create one */

        if (Node->Type == ACPI_TYPE_ANY)
        {
            Type = ACPI_TYPE_DEVICE;
        }
        else
        {
            Type = Node->Type;
        }

        ObjDesc = AcpiUtCreateInternalObject (Type);
        if (!ObjDesc)
        {
            Status = AE_NO_MEMORY;
            goto UnlockAndExit;
        }

        /* Init new descriptor */

        ObjDesc->Common.Type = (UINT8) Type;

        /* Attach the new object to the Node */

        Status = AcpiNsAttachObject (Node, ObjDesc, Type);

        /* Remove local reference to the object */

        AcpiUtRemoveReference (ObjDesc);

        if (ACPI_FAILURE (Status))
        {
            goto UnlockAndExit;
        }
    }

    ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
        "Installing address handler for region %s(%X) on Device %4.4s %p(%p)\n",
        AcpiUtGetRegionName (SpaceId), SpaceId,
        AcpiUtGetNodeName (Node), Node, ObjDesc));

    /*
     * Install the handler
     *
     * At this point there is no existing handler.
     * Just allocate the object for the handler and link it
     * into the list.
     */
    HandlerObj = AcpiUtCreateInternalObject (ACPI_TYPE_LOCAL_ADDRESS_HANDLER);
    if (!HandlerObj)
    {
        Status = AE_NO_MEMORY;
        goto UnlockAndExit;
    }

    /* Init handler obj */

    HandlerObj->AddressSpace.SpaceId = (UINT8) SpaceId;
    HandlerObj->AddressSpace.HandlerFlags = Flags;
    HandlerObj->AddressSpace.RegionList = NULL;
    HandlerObj->AddressSpace.Node = Node;
    HandlerObj->AddressSpace.Handler = Handler;
    HandlerObj->AddressSpace.Context = Context;
    HandlerObj->AddressSpace.Setup  = Setup;

    /* Install at head of Device.AddressSpace list */

    HandlerObj->AddressSpace.Next = ObjDesc->Device.Handler;

    /*
     * The Device object is the first reference on the HandlerObj.
     * Each region that uses the handler adds a reference.
     */
    ObjDesc->Device.Handler = HandlerObj;

    /*
     * Walk the namespace finding all of the regions this
     * handler will manage.
     *
     * Start at the device and search the branch toward
     * the leaf nodes until either the leaf is encountered or
     * a device is detected that has an address handler of the
     * same type.
     *
     * In either case, back up and search down the remainder
     * of the branch
     */
    Status = AcpiNsWalkNamespace (ACPI_TYPE_ANY, Node, ACPI_UINT32_MAX,
                ACPI_NS_WALK_UNLOCK, AcpiEvInstallHandler,
                HandlerObj, NULL);

UnlockAndExit:
    return_ACPI_STATUS (Status);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiEvExecuteRegMethods
 *
 * PARAMETERS:  Node            - Namespace node for the device
 *              SpaceId         - The address space ID
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Run all _REG methods for the input Space ID;
 *              Note: assumes namespace is locked, or system init time.
 *
 ******************************************************************************/

ACPI_STATUS
AcpiEvExecuteRegMethods (
    ACPI_NAMESPACE_NODE     *Node,
    ACPI_ADR_SPACE_TYPE     SpaceId)
{
    ACPI_STATUS             Status;


    ACPI_FUNCTION_TRACE (EvExecuteRegMethods);


    /*
     * Run all _REG methods for all Operation Regions for this
     * space ID.  This is a separate walk in order to handle any
     * interdependencies between regions and _REG methods.  (i.e. handlers
     * must be installed for all regions of this Space ID before we
     * can run any _REG methods)
     */
    Status = AcpiNsWalkNamespace (ACPI_TYPE_ANY, Node, ACPI_UINT32_MAX,
                ACPI_NS_WALK_UNLOCK, AcpiEvRegRun,
                &SpaceId, NULL);

    return_ACPI_STATUS (Status);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiEvRegRun
 *
 * PARAMETERS:  WalkNamespace callback
 *
 * DESCRIPTION: Run _REG method for region objects of the requested spaceID
 *
 ******************************************************************************/

static ACPI_STATUS
AcpiEvRegRun (
    ACPI_HANDLE             ObjHandle,
    UINT32                  Level,
    void                    *Context,
    void                    **ReturnValue)
{
    ACPI_OPERAND_OBJECT     *ObjDesc;
    ACPI_NAMESPACE_NODE     *Node;
    ACPI_ADR_SPACE_TYPE     SpaceId;
    ACPI_STATUS             Status;


    SpaceId = *ACPI_CAST_PTR (ACPI_ADR_SPACE_TYPE, Context);

    /* Convert and validate the device handle */

    Node = AcpiNsMapHandleToNode (ObjHandle);
    if (!Node)
    {
        return (AE_BAD_PARAMETER);
    }

    /*
     * We only care about regions.and objects
     * that are allowed to have address space handlers
     */
    if ((Node->Type != ACPI_TYPE_REGION) &&
        (Node != AcpiGbl_RootNode))
    {
        return (AE_OK);
    }

    /* Check for an existing internal object */

    ObjDesc = AcpiNsGetAttachedObject (Node);
    if (!ObjDesc)
    {
        /* No object, just exit */

        return (AE_OK);
    }

    /* Object is a Region */

    if (ObjDesc->Region.SpaceId != SpaceId)
    {
        /*
         * This region is for a different address space
         * -- just ignore it
         */
        return (AE_OK);
    }

    Status = AcpiEvExecuteRegMethod (ObjDesc, 1);
    return (Status);
}