NdisRawWritePortBufferUchar (NDIS 5.1) function

Article
06/19/2017

Note NDIS 5. x has been deprecated and is superseded by NDIS 6. x. For new NDIS driver development, see Network Drivers Starting with Windows Vista. For information about porting NDIS 5. x drivers to NDIS 6. x, see Porting NDIS 5.x Drivers to NDIS 6.0.

NdisRawWritePortBufferUchar writes a specified number of bytes from a caller-supplied buffer to a given I/O port.

Syntax

VOID NdisRawWritePortBufferUchar(
  _In_ ULONG_PTR Port,
  _In_ PUCHAR    Buffer,
  _In_ ULONG     Length
);

Parameters

Port [in]
Specifies the I/O port. This address falls in a range that was mapped during initialization with NdisMRegisterIoPortRange.
Buffer [in]
Pointer to a caller-allocated resident buffer containing the bytes to be written.
Length [in]
Specifies the number of bytes to write to the I/O port.

Return value

None

Remarks

A NIC driver calls NdisRawWritePortBufferUchar to transfer a sequence of bytes, one at a time, to its NIC.

NdisRawWritePortBufferUchar runs significantly faster than NdisImmediateWritePortBufferUchar because it need not map a bus-relative port address onto a host-dependent logical port address at every call.

Requirements

Target platform	Desktop
Version	See NdisRawWritePortBufferUchar.
Header	Ndis.h (include Ndis.h)
IRQL	Any level