WdfDeviceGetHardwareRegisterMappedAddress function
[Applies to UMDF only]
A driver calls WdfDeviceGetHardwareRegisterMappedAddress to get the user-mode mapped address of the memory resource it mapped previously using WdfDeviceMapIoSpace.
Syntax
PVOID WdfDeviceGetHardwareRegisterMappedAddress( _In_ WDFDEVICE Device, _In_ PVOID PseudoBaseAddress );
Parameters
- Device [in]
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A handle to a framework device object.
- PseudoBaseAddress [in]
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The address of a location that receives a pointer to the pseudo base address.
Return value
User-mode base address of the resources mapped earlier using WdfDeviceMapIoSpace.
Remarks
This function is the UMDF version 2 equivalent of IWDFDevice3::GetHardwareRegisterMappedAddress.
After the driver calls WdfDeviceGetHardwareRegisterMappedAddress, it can access the user-mode address directly to read and write to the register.
Note This is not the recommended approach for accessing registers because it prevents UMDF from doing any validation on the access.
If you do use WdfDeviceGetHardwareRegisterMappedAddress, you must set the UmdfRegisterAccessMode INF directive to RegisterAccessUsingUserModeMapping. For more information about UMDF INF directives, see Specifying WDF Directives in INF Files.
Requirements
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Minimum support | Windows 8.1 |
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Minimum UMDF version | 2.0 |
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Header |
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Library |
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IRQL | PASSIVE_LEVEL |
See also
