[TUHS] maybe off-topic: Unix on a microcontroller
Tom Ivar Helbekkmo
tih at hamartun.priv.no
Sun Jun 17 20:27:33 AEST 2018
Noel Chiappa <jnc at mercury.lcs.mit.edu> writes:
> ISTR reading that it runs in Supervisor mode (no doubt so it could use the
> Supervisor mode virtual address space, and not have to go crazy with overlays
> in the Kernet space).
Indeed. From "Installing and Operating 2.11BSD on the PDP-11":
The networking in 2.11BSD runs in supervisor mode, separate from
the mainstream kernel. There is room without overlaying to hold
both a SL/IP and ethernet driver. This is a major win, as it
allows the networking to maintain its mbufs in normal data
space, among other things.
-tih
--
Most people who graduate with CS degrees don't understand the significance
of Lisp. Lisp is the most important idea in computer science. --Alan Kay
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