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Chapter 8. Interrupt-Driven I/O > Driver Initialization and Cleanup
Driver Initialization and Cleanup
Programmed I/O device drivers must perform extra initialization during DriverEntry (or AddDevice for WDM drivers). Similarly, the driver's Unload routine must be extended to remove the additional resources allocated.
Initializing the Start I/O Entry Point
If a driver has a Start I/O routine, it must be announced during DriverEntry. This is done by storing the address of the Start I/O routine into the DriverStartIo field of the driver object, as in the following code fragment.
