Path: utzoo!mnetor!uunet!mcvax!botter!star!ast
From: ast@cs.vu.nl (Andy Tanenbaum)
Newsgroups: comp.os.minix
Subject: Re: alternative ways to construct system task
Message-ID: <670@ast.cs.vu.nl>
Date: 10 Mar 88 13:54:39 GMT
References: <1421@louie.udel.EDU>
Reply-To: ast@cs.vu.nl (Andy Tanenbaum)
Organization: VU Informatica, Amsterdam
Lines: 15

In article <1421@louie.udel.EDU> Leisner.Henr@xerox.com (Marty) writes:
>As long as either mm or fs (but not both) use the system task (for example --
>sys_exec() by mm) I'm thinking of providing a callgate interface on 80286
>systems.
>
Not unreasonable.

>
>I'm also thinking of using callgates to implement magic calls between mm and fs.

I see this as a conceptual hack. These are user space processes and really
shouldn't be talking to each other directly.  User-kernel interaction is
more logical (cf. the MULTICS ring structure).

Andy Tanenbaum (ast@cs.vu.nl)