// dispmprt.h

ULONG DlReadDeviceSpace(
  PVOID DeviceHandle,
  ULONG DataType,
  ULONG SlotNumber,
  PVOID Buffer,
  ULONG Offset,
  ULONG Length
);
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Windows Driver Kit DDI reference (nf-dispmprt-dlreaddevicespace)

DlReadDeviceSpace function

Description

Reads from a device configuration space or the expansion ROM of a display adapter.

Parameters

`DeviceHandle`

A handle that represents a display adapter.

`DataType`

The type of read transaction to be performed.

`SlotNumber`

`Buffer`

A pointer to a caller-allocated buffer that receives the data read from the configuration space or ROM.

`Offset`

The offset, into the configuration space or the expansion ROM, at which the read transaction begins.

`Length`

The number of bytes to be read.

Return value

This function returns ULONG.

DlReadDeviceSpace - NtDoc