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Potentially syscall to request access to specific ports, so a faulty driver that attempts to access a port it hasn't requested, it can be terminated
Memory mapping syscall
Registering and handling interrupts from userspace
Potentially by having a thread for each interrupt source, and blocking until the kernel messages it that an interrupt has been received
Threads waiting on an interrupt could also potentially be re-prioritized on interrupt reception, and the scheduler called
Registering a callback with the kernel would be more efficient, but would sacrifice some of the security/stability concerns of moving drivers to userspace
Inefficient drivers whose interrupts fire often can bog down the system
If drivers are run in kernel mode, they have greater access to the system
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