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Date:      Tue, 28 Oct 1997 20:04:54 +0000
From:      njs3@doc.ic.ac.uk (Niall Smart)
To:        Terry Lambert <tlambert@primenet.com>, njs3@doc.ic.ac.uk (Niall Smart)
Cc:        freebsd-hackers@freebsd.org
Subject:   Re: Loading code from userland
Message-ID:  <E0xQHsk-0007XH-00@ash2.doc.ic.ac.uk>
In-Reply-To: Terry Lambert <tlambert@primenet.com> "Re: Loading code from userland" (Oct 28,  5:57pm)

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On Oct 28,  5:57pm, Terry Lambert wrote:
[snip]
> FreeBSD does not support the concept of more than two protection
> domains, mostly because it aspires to run on more hardware than just
> VAX and Intel processors, and some of that hardware only supports
> two domain identities.

I presume the two protection domains you refer to are user and supervisor
modes.

> In practice, the LKM will need to be frequently recompiled.  A
> procedurally abstract interface does not depend on structure
> references, so this is another reason to use one instead of LKM's
> (at least until there is a formal DDI/DKI specification).

What do DDI/DDK stand for?  Is there a project implementing them (you
seem to think they are useful)

Niall



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