// video.h

VIDEOPORT_DEPRECATED VIDEOPORT_API ULONG VideoPortReadPortUlong(
  PULONG Port
);
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Windows Driver Kit DDI reference (nf-video-videoportreadportulong)

VideoPortReadPortUlong function

Description

The VideoPortReadPortUlong function reads a ULONG value from 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.

Return value

VideoPortReadPortUlong returns the ULONG value read from the adapter.

Remarks

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

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

VideoPortReadPortUlong - NtDoc