Messages in this thread | | | Date | Tue, 19 May 1998 11:19:08 -0500 | From | Jeff Noxon <> | Subject | Change mode to kernel? |
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Is it possible for user code to change to kernel mode and back? Or is that something that only VMS can do? :)
I want to write a simple device driver that doesn't require IRQs or DMAs, and I'd rather not do the dirty part as a kernel module. Certain I/O operations need to be atomic to avoid races with other code tweaking the same hardware. I understand (possibly incorrectly) that it isn't safe (or possible) to disable IRQs in userland...
What's the best approach?
Thanks in advance,
Jeff
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