NdisMUnmapIoSpace function (ndis.h)
NdisMUnmapIoSpace releases a virtual range mapped by an initialization-time call to NdisMMapIoSpace.
Syntax
void NdisMUnmapIoSpace(
[in] NDIS_HANDLE MiniportAdapterHandle,
[in] PVOID VirtualAddress,
[in] UINT Length
);
Parameters
[in] MiniportAdapterHandle
Specifies the handle originally input to MiniportInitializeEx.
[in] VirtualAddress
Specifies the base virtual address for the mapped range that was returned by NdisMMapIoSpace.
[in] Length
Specifies the number of bytes in the range that was mapped with NdisMMapIoSpace.
Return value
None
Remarks
When a miniport driver 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 miniport driver's MiniportInitializeEx and MiniportHaltEx functions.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Supported for NDIS 6.0 and NDIS 5.1 drivers (see NdisMUnmapIoSpace (NDIS 5.1)) in Windows Vista. Supported for NDIS 5.1 drivers (see NdisMUnmapIoSpace (NDIS 5.1)) in Windows XP. |
| Target Platform | Universal |
| Header | ndis.h (include Ndis.h) |
| Library | Ndis.lib |
| IRQL | PASSIVE_LEVEL |
| DDI compliance rules | Irql_Miniport_Driver_Function(ndis) |