MmUnmapIoSpace function (wdm.h)
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
[in] BaseAddress
Pointer to the base virtual address to which the physical pages were mapped.
[in] NumberOfBytes
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
Requirement | Value |
---|---|
Minimum supported client | Available starting with Windows 2000. |
Target Platform | Universal |
Header | wdm.h (include Wdm.h, Ntddk.h, Ntifs.h) |
Library | NtosKrnl.lib |
DLL | NtosKrnl.exe |
IRQL | <=DISPATCH_LEVEL |
See also
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