WdfDeviceUnmapIoSpace function (wdfdevice.h)

[Applies to UMDF only]

The WdfDeviceUnmapIoSpace function unmaps a specified range of physical addresses previously mapped by the WdfDeviceMapIoSpace function.

Syntax

void WdfDeviceUnmapIoSpace(
  [in] WDFDEVICE Device,
  [in] PVOID     PseudoBaseAddress,
  [in] SIZE_T    NumberOfBytes
);

[in] Device

A handle to a framework device object.

[in] PseudoBaseAddress

The address of a location that receives a pointer to the pseudo base address.

[in] NumberOfBytes

Specifies a value greater than zero, indicating the number of bytes to be mapped.

None

This function is the UMDF version 2 equivalent of IWDFDevice3::UnmapIoSpace.

If a driver calls WdfDeviceMapIoSpace in EvtDevicePrepareHardware callback, it must call WdfDeviceUnmapIoSpace in its EvtDeviceReleaseHardware callback.