// video.h

VIDEOPORT_DEPRECATED VIDEOPORT_API VOID VideoPortWritePortUlong(
  PULONG Port,
  ULONG  Value
);
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Windows Driver Kit DDI reference (nf-video-videoportwriteportulong)

VideoPortWritePortUlong function

Description

The VideoPortWritePortUlong function writes a ULONG value to a mapped I/O port.

Parameters

`Port`

Pointer to the port. The given Port must be in a mapped I/O-space range returned by VideoPortGetDeviceBase.

`Value`

Specifies a ULONG value to be transferred to the adapter.

Return value

None

Remarks

A miniport driver's HwVidInterrupt or HwVidSynchronizeExecutionCallback function can call VideoPortWritePortUlong.

Callers of VideoPortWritePortUlong can be running at any IRQL, provided that the memory pointed to by the Port parameter is resident, mapped device memory.

VideoPortWritePortUlong - NtDoc