On Wednesday 12 August 2009 10:36:02 Jamie Lokier wrote: > Jim Donelson wrote: > > I wonder why (on an SP machine) you don't just disable interrupts for > > a few instructions and give yourself an atomic dec? > > Yes, that's fine. > > However, it's not secure to allow userspace to disable interrupts(*), > so we've talked about a custom instruction which lets userspace > disable interrupts for a maximum of 3/4 instructions, then the > hardware forces them on again. > > (*) with an MMU; without an MMU there's no security anyway so it > doesn't matter as much.
s/without an MMU/without an MMU or MPU/ ;) -mike
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