VideoPortUnmapDmaMemory - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers 
// video.h

VIDEOPORT_DEPRECATED VIDEOPORT_API BOOLEAN VideoPortUnmapDmaMemory(
  PVOID  HwDeviceExtension,
  PVOID  VirtualAddress,
  HANDLE ProcessHandle,
  PDMA   BoardMemoryHandle
);
View the official Windows Driver Kit DDI reference

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Windows Driver Kit DDI reference (nf-video-videoportunmapdmamemory)

VideoPortUnmapDmaMemory function

Description

The VideoPortUnmapDmaMemory function is obsolete in Windows 2000 and later.

VideoPortUnmapDmaMemory unmaps a range of memory previously mapped by VideoPortMapDmaMemory.

Parameters

HwDeviceExtension

Pointer to the miniport driver's device extension.

VirtualAddress

Pointer to a virtual address within the mapped range to be released.

ProcessHandle

Is the handle to the current process.

BoardMemoryHandle

Is the handle to adapter's memory.

Return value

VideoPortUnmapDmaMemory always FALSE.

Remarks

See Bus-Master DMA in Video Miniport Drivers for information about packet-based and common-buffer DMA transfers.

View the official Windows Driver Kit DDI reference

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