VideoPortMapDmaMemory - NtDoc

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

VIDEOPORT_DEPRECATED VIDEOPORT_API PDMA VideoPortMapDmaMemory(
  [in]      IN PVOID                 HwDeviceExtension,
  [in]      IN PVIDEO_REQUEST_PACKET pVrp,
  [in]      IN PHYSICAL_ADDRESS      BoardAddress,
  [in]      IN PULONG                Length,
  [in]      IN PULONG                InIoSpace,
  [in]      IN PVOID                 MappedUserEvent,
  [in]      IN PVOID                 DisplayDriverEvent,
  [in, out] IN OUT PVOID             *VirtualAddress
);
View the official Windows Driver Kit DDI reference

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

VideoPortMapDmaMemory function

Description

The VideoPortMapDmaMemory function is obsolete in Windows 2000 and later.

VideoPortMapDmaMemory maps a range of memory for use in DMA transfers.

Parameters

HwDeviceExtension [in]

Pointer to the miniport driver's device extension.

pVrp [in]

Pointer to a VIDEO_REQUEST_PACKET.

BoardAddress [in]

Specifies the adapter's beginning address.

Length [in]

Specifies the length, in bytes, of the range of memory.

InIoSpace [in]

Indicates the location of the range. This parameter can be one of the following values:

Value Meaning
VIDEO_MEMORY_SPACE_DENSE Memory is densely mapped and linear.
VIDEO_MEMORY_SPACE_IO The range is in system I/O space. Should not be set by the display driver.
VIDEO_MEMORY_SPACE_MEMORY The range is in memory space. Should not be set by the display driver.
VIDEO_MEMORY_SPACE_P6CACHE P6 MTRR caching, which is equivalent to write-combine caching. (kernel and user mode).
VIDEO_MEMORY_SPACE_USER_MODE Memory pointer for application use.

MappedUserEvent [in]

Is reserved for system use.

DisplayDriverEvent [in]

Is reserved for system use.

VirtualAddress [in, out]

Is reserved for system use.

Return value

VideoPortMapDmaMemory always returns NULL.

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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