Use of Interrupt Priorities by Windows 2000
The last chapter introduced the concept of interrupt priorities as a means of arbitrating among different I/O devices competing for CPU service. This section presents a scheme implemented by Windows 2000 that not only takes into account hardware interrupt prioritization, but extends the concept to include prioritization of execution context.
CPU Priority Levels
Since different CPU architectures have different ways of handling hardware interrupt priorities, Windows 2000 presents an idealized, abstract scheme to deal with all platforms. The actual implementation of the abstraction utilizes HAL routines that are platform-specific.
The basis for this abstract priority scheme is the interrupt request level ...
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