Path: utzoo!attcan!uunet!cbmvax!ditto
From: ditto@cbmvax.UUCP (Michael "Ford" Ditto)
Newsgroups: comp.sys.amiga.tech
Subject: Re: MMU in 2620/Macintosh emulation
Message-ID: <5821@cbmvax.UUCP>
Date: 26 Jan 89 21:31:36 GMT
References: <7338@netnews.upenn.edu> <5819@cbmvax.UUCP>
Reply-To: ditto@cbmvax.UUCP (Michael "Ford" Ditto)
Organization: Commodore Technology, West Chester, PA
Lines: 16

In article <5819@cbmvax.UUCP> daveh@cbmvax.UUCP (Dave Haynie) writes:
>Since all the
>Mac OS stuff runs in Supervisor mode, there's no way to trap MMU instructions

Sure there is, that's what all the 68020 virtual machine support is for.
It's for that very reason that the mov sr,ea was made a privileged
instruction, so that you could run OSes in user mode without their knowing
it.  It would cause a slight performance decrease, since every privileged
instruction in the Mac OS would have to be emulated.
-- 
					-=] Ford [=-

"The number of Unix installations	(In Real Life:  Mike Ditto)
has grown to 10, with more expected."	ford@kenobi.cts.com
- The Unix Programmer's Manual,		...!sdcsvax!crash!elgar!ford
  2nd Edition, June, 1972.		ditto@cbmvax.commodore.com