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DCE Flags

DCE bit 2 indicates that a driver supports the driver gestalt interface defined in the next section. The complete list of DCE bits in the dCtlflags word is given in Table 8-4.

Table 8-4 DCE bits in dCtlflags word

Name	Value	Description
`VMImmune`	0	This bit indicates that your device driver is VM safe.
`reserved`	1	This bit is reserved.
`kmDriverGestaltEnableMask`	2	This bit is set if the driver supports the Driver Gestalt mechanism.
Native Driver	3	Set if the driver is a native driver (ndrv). The system sets this bit when it loads your native driver.
Concurrent	4	Set if the native driver supports concurrent operation. When loading a native driver, the system sets this bit based on the `kDriverIsConcurrent` field of the `driverOSRuntimeInfo.driverRuntime` field of your `DriverDescription`.
`dOpenedMask`	5	This bit is set if the driver is open.
`dRAMBasedMask`	6	(Not used with native drivers) This bit is set if the `dCtlDriver` field is a `DRVRHeaderHandle` rather than `aDRVRHeaderPtr`.
`drvrActiveMask`	7	This bit is set if the driver is currently processing a request.
`dReadEnableMask`	8	This bit is set if the driver handles `_Read` requests.
`dWriteEnableMask`	9	This bit is set if the driver handles `_Write` requests.
`dCtlEnableMask`	10	This bit is set if the driver handles `_Control` requests.
`dStatEnableMask`	11	This bit is set if the driver handles `_Status` requests.
`dNeedGoodbyeMask`	12	This bit is set if the driver needs a "goodbye" `_Control` call before the application heap is reinitialized.
`dNeedTimeMask`	13	This bit is set if the driver wants periodic SystemTask time through the "accRun" `_Control` call.
`dNeedLockMask`	14	This bit is set if the driver requires that its DCE and code be locked at all times while the driver is open.
`reserved`	15	This bit is reserved.