Messages in this thread | | | From | (H. Peter Anvin) | Subject | Re: Change mode to kernel? | Date | 19 May 1998 21:11:45 GMT |
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Followup to: <19980519111908.A20937@planetfall.com> By author: Jeff Noxon <jeff@planetfall.com> In newsgroup: linux.dev.kernel > > 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? >
Doing the dirty part as a kernel module.
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