Writing Driver Dispatch Routines
Depending on the complexity of the device operation and the kind of I/O request, driver Dispatch routines range from trivial to quite difficult to implement. This section explains how to code these routines.
Execution Context
All Dispatch routines share the same function signature. (A function signature includes the number and type of parameters, and its calling convention.) Table 7.2 shows the prototype for all Dispatch routines. Like the driver's initialization and unload routines, Dispatch routines run at PASSIVE_LEVEL IRQL, which means they can access paged system resources.
The I/O Manager invokes Dispatch routines in response to user-mode or kernel-mode requests. Before calling, the I/O Manager builds and ...
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