ABSTRACT
Figure 2.1 shows how I have divided up a device driver’s functionality into different modules. The figure also shows the filenames that I have used for the modules in this book.
Strictly speaking, only the Initialization module is mandatory. In practice, all drivers have dispatch routines to handle user I/O requests. A WDM device driver needs a Plug and Play module, along with an installation INF file. NT style drivers will usually create their devices in their Initialization routine and delete them in an Unload routine. All other modules are
dows Management Instrumentation modules, simply to pass any requests to lower drivers.
