Subject: Re: Unfinished business - +256MB RAM (3 level page table)
To: None <port-mips@NetBSD.org, port-evbmips@NetBSD.org>
From: der Mouse <mouse@Rodents.Montreal.QC.CA>
Date: 03/20/2004 00:45:15
>>> The introduction of "supervisor mode" was a mystery.
>> It was introduced to try to get DEC to adopt it for its new
>> machines, I thought, since VMS needed it.
> I'm skeptic it because VAX does not have it.
...huh?? Sure the VAX has it. The VAX has four privilege modes: user,
supervisor, executive, and kernel. VMS used all four: memory says it
was user for most code, supervisor for the CLI, executive for the
filesystem, and kernel for, well, the kernel: scheduler, VM, device
Unless the "supervisor mode" under discussion isn't a privilege level
wedged in between the usual userland and OS-kernel modes (which latter
is called "supervisor mode" by some other CPUs, such as the 68k, that
have only two privilege modes).
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