Function IoQueryKsrPersistentMemorySizeEx 

pub unsafe extern "C" fn IoQueryKsrPersistentMemorySizeEx(
    DriverObject: PDRIVER_OBJECT,
    PhysicalDeviceObject: PDEVICE_OBJECT,
    PhysicalDeviceId: PUNICODE_STRING,
    DataTag: PUSHORT,
    DataVersion: PULONG,
    BufferSize: PSIZE_T,
) -> NTSTATUS