Structure of a Kernel-Mode Driver
A kernel-mode driver looks very different from conventional applications. In general, a driver is just a collection of routines that are called by operating system software (usually the I/O Manager). Flow charts don't provide much benefit when diagramming control paths of a device driver. The routines of the driver sit passively until they are invoked by routines of the I/O Manager.
Depending on the driver, the I/O Manager might call a driver routine in any of the following situations:
When a driver is loaded
When a driver is unloaded or the system is shutting down
When a device is inserted or removed
When a user-mode program issues an I/O system service call
When a shared hardware resource becomes available for ...
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