From: Tom Ivar Helbekkmo via TUHS <tuhs@minnie.tuhs.org>
To: Noel Chiappa <jnc@mercury.lcs.mit.edu>
Cc: TUHS@minnie.tuhs.org
Subject: Re: [TUHS] maybe off-topic: Unix on a microcontroller
Date: Sun, 17 Jun 2018 12:27:33 +0200 [thread overview]
Message-ID: <m2fu1lr9m2.fsf@thuvia.hamartun.priv.no> (raw)
In-Reply-To: <20180616192402.120E718C0A7@mercury.lcs.mit.edu> (Noel Chiappa's message of "Sat, 16 Jun 2018 15:24:02 -0400 (EDT)")
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Noel Chiappa <jnc@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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next prev parent reply other threads:[~2018-06-17 10:33 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-16 19:24 Noel Chiappa
2018-06-17 10:27 ` Tom Ivar Helbekkmo via TUHS [this message]
[not found] <mailman.1.1529200802.30486.tuhs@minnie.tuhs.org>
2018-06-17 9:36 ` Johnny Billquist
[not found] <mailman.1.1529114402.31005.tuhs@minnie.tuhs.org>
2018-06-16 19:13 ` Johnny Billquist
-- strict thread matches above, loose matches on Subject: below --
2018-06-15 9:12 arnold
2018-06-15 9:22 ` Lars Brinkhoff
2018-06-15 14:25 ` Warner Losh
2018-06-15 19:09 ` Tom Ivar Helbekkmo via TUHS
2018-06-15 19:12 ` Warner Losh
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