NdisMUnmapIoSpace

VOID
NdisMUnmapIoSpace(
IN NDIS_HANDLE MiniportAdapterHandle,
IN PVOID VirtualAddress,
IN UINT Length
);

NdisMUnmapIoSpace releases a virtual range mapped by an initialization-time call to NdisMMapIoSpace.

Parameters

MiniportAdapterHandle: Specifies the handle originally input to MiniportInitialize.
VirtualAddress: Specifies the base virtual address for the mapped range that was returned by NdisMMapIoSpace.
Length: Specifies the number of bytes in the range that was mapped with NdisMMapIoSpace.

Comments

When a miniport is unloading, any memory range that it mapped during initialization with NdisMMapIoSpace must be released with a call to NdisMUnmapIoSpace.

The Length passed to NdisMUnmapIoSpace must match the Length originally passed to NdisMMapIoSpace.

NdisMUnmapIoSpace can be called only from a NIC driver’s MiniportInitialize and MiniportHalt functions.

Callers of NdisMUnmapIoSpace run at IRQL PASSIVE_LEVEL.