// dispmprt.h
VOID DlFreeDeviceBase(
IN PVOID DeviceHandle,
IN PVOID MappedAddress
);
View the official Windows Driver Kit DDI referenceNo description available.
Frees a range of bus-relative device I/O ports or memory addresses previously mapped into the system address space.
DeviceHandleA handle that represents a display adapter.
MappedAddressSpecifies the base address of the mapped range to be freed.