VideoPortUnmapMemory - NtDoc
Native API online documentation, based on the System Informer
(formerly Process Hacker) phnt
headers
// video.h
VIDEOPORT_DEPRECATED VIDEOPORT_API VP_STATUS VideoPortUnmapMemory(
PVOID HwDeviceExtension,
PVOID VirtualAddress,
HANDLE ProcessHandle
);
View the official Windows Driver Kit DDI referenceNo description available.
The VideoPortUnmapMemory function releases a mapping between a logical address range for the adapter and a virtual address range in the user-mode address space of a particular thread. This function is the complement of VideoPortMapMemory.
HwDeviceExtensionPointer to the miniport driver's device extension.
VirtualAddressPointer to a virtual address within the mapped range to be released.
ProcessHandleShould be set to zero, or to the process handle specified when the miniport driver called VideoPortMapMemory.
VideoPortUnmapMemory returns NO_ERROR if the mapping was released. Otherwise, it returns ERROR_INVALID_PARAMETER.
A miniport driver cannot release a subrange of the mapping between a logical device range and the user-space virtual address range of its corresponding display driver. Whether the VirtualAddress parameter is the base virtual address for the mapped range that was returned by VideoPortMapMemory, or is an offset into that mapped virtual range, VideoPortUnmapMemory releases the mapping for the full range.