NdisRawWritePortBufferUchar macro (ndis.h)

Article
02/22/2024

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

Syntax

void NdisRawWritePortBufferUchar(
  [in]  Port,
  [in]  Buffer,
  [in]  Length
);

Parameters

[in] Port

Specifies the I/O port. This address falls in a range that was mapped during initialization with NdisMRegisterIoPortRange.

[in] Buffer

Pointer to a caller-allocated resident buffer containing the bytes to be written.

[in] Length

Specifies the number of bytes to write to the I/O port.

Return value

None

Remarks

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

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

Requirements

Requirement	Value
Minimum supported client	Supported for NDIS 6.0 and NDIS 5.1 drivers (see NdisRawWritePortBufferUchar (NDIS 5.1)) in Windows Vista. Supported for NDIS 5.1 drivers (see NdisRawWritePortBufferUchar (NDIS 5.1)) in Windows XP.
Target Platform	Universal
Header	ndis.h (include Ndis.h)
IRQL	Any level