19 Jun
2024
19 Jun
'24
12:49 p.m.
Sort of between kernel and user mode, Unix [zillion trademarks etc] never
used it. but did RSX-11?
I used the latter long enough to hate it until Edition 5 arrived at UNSW,
and I still remember being blown away by the fact that there was nothing
privileged about the Shell :-)
-- Dave
19 Jun
19 Jun
1:48 p.m.
On Wed, Jun 19, 2024, 1:37 AM Dave Horsfall <dave(a)horsfall.org> wrote:
Sort of between kernel and user mode, Unix [zillion
trademarks etc] never
used it. but did RSX-11?
2.11BSD used a mode between kernel and user for the TCP stack to get more
effective address space...
Warner
I used the latter long enough to hate it until Edition 5 arrived at UNSW,
and I still remember being blown away by the fact that
there was nothing
privileged about the Shell :-)
-- Dave
5:11 p.m.
On Jun 19, 2024, at 1:49 AM, Dave Horsfall
<dave(a)horsfall.org> wrote:
Sort of between kernel and user mode, Unix [zillion trademarks etc] never
used it. but did RSX-11?
I don’t know about RSX-11.
Back to UNIX: Supervisor mode probably never ran any code, but its memory management
registers were used in m45.s in functions copyseg and clearseg.
—Milo
185
days inactive
185
days old
2 comments
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participants (3)
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Dave Horsfall -
Milo Velimirović -
Warner Losh