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From: michael@stb.UUCP (Michael)
Newsgroups: comp.sys.amiga
Subject: Re: the 68070 - has it left hyperspace yet? (Really: MEMF_PUBLIC)
Message-ID: <1555@stb.UUCP>
Date: Sun, 17-May-87 15:22:06 EDT
Article-I.D.: stb.1555
Posted: Sun May 17 15:22:06 1987
Date-Received: Tue, 19-May-87 04:11:29 EDT
References: <280@spectrix.UUCP> <110@l5comp.UUCP> <303@rocky.STANFORD.EDU> <2686@cit-vax.Caltech.Edu>
Reply-To: michael@stb.UUCP (Michael)
Distribution: world
Organization: STB BBS, La, Ca, USA, 90402
Lines: 27
Keywords: 68070, signetics, Philips, mac/st/amiga UN*X
Summary: Only other TASKS/DEVICES need MEMF_PUBLIC'd mem.

In article <2686@cit-vax.Caltech.Edu> walton@tybalt.caltech.edu.UUCP (Steve Walton) writes:
>Since none of the Wizards took this up, thought I would.  Nearly EVERY
>system call in the Amiga gets a pointer, and thus this pointer would
>have to be MEMF_PUBLIC if we had an MMU.  When was the last time

ONLY pointers passed to other tasks (including devices) needs to be MEMF_PUBLIC.
You do not need to declare memory passed to intuition calls, exec.library,
graphics.library, etc. Only memory that is
A: Pointed to by a pointer in a message
B: The message itself (not sure about this, the send message call may imply
		any re-mapping necesary)
C: The segments loaded by LoadSeg() (since they may be used for another task)

What I'd like to know is: If you put a MMU up, how do you tell AddTask()?
All you give it is starting address, termination routine. How does it know
any MMU information? Does it need to run from MEMF_PUBLIC or would it 
share your MMU status (which makes sense). How would CreateProc inform
exec about MMU information in the segments?

Bottom line (as far as I can tell): Code (text and initialized data) must
be MEMF_PUBLIC, only AllocMem() memory can be otherwise (including non-
initialized data).
				Michael
-- 
: Michael Gersten		seismo!scgvaxd!stb!michael
: The above is the result of being educated at a school that discriminates
: against roosters.