MmUnmapIoSpace routine
The MmUnmapIoSpace routine unmaps a specified range of physical addresses previously mapped by MmMapIoSpace.
Syntax
VOID MmUnmapIoSpace( _In_ PVOID BaseAddress, _In_ SIZE_T NumberOfBytes );
Parameters
- BaseAddress [in]
-
Pointer to the base virtual address to which the physical pages were mapped.
- NumberOfBytes [in]
-
Specifies the number of bytes that were mapped.
Return value
None
Remarks
If a driver calls MmMapIoSpace during device start-up, it must call MmUnmapIoSpace when it receives a PnP stop-device or remove-device IRP for the same device object.
Requirements
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Version | Available starting with Windows 2000. |
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Header |
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Library |
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IRQL | <=DISPATCH_LEVEL |
See also
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Build date: 5/22/2013
