24 Mar
2016
24 Mar
'16
5:37 p.m.
On 2016-03-24 12:35, Ron Natalie wrote:
Hmm. Ok. Gotta check this out. Thanks for the details.
Johnny
--
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: bqt(a)softjar.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol
Ok. Color me stupid, but I don't get it. I
totally do not understand how this locks anything out.
I misstated that a bit. The issue is if the next instruction is also an SPL
instruction, then interrupts never get enabled. So if you have a run of SPL
instructions, interrupts are locked out for the duration. If you can fill your address
space with SPL instructions (provided the OS doesn't fail in the process), you can
cause an uninterruptable loop. Interupt includes the HALT switch on the front. You
have to use the BUS RESET to jab it out of its catatonic state.