home *** CD-ROM | disk | FTP | other *** search
- From: clausb@hpbbrd.bbn.hp.com (Claus Brod)
- Date: Thu, 17 Dec 1992 13:34:43 GMT
- Subject: Re: XBRA and Memory Protection.
- Message-ID: <BzEoDw.39n@hpbbrd.bbn.hp.com>
- Organization: HP Mechanical Design Division
- Path: sparky!uunet!spool.mu.edu!sdd.hp.com!col.hp.com!news.dtc.hp.com!hpscit.sc.hp.com!hplextra!hpcc05!hpbbn!hpbbrd!clausb
- Newsgroups: comp.sys.atari.st.tech
- References: <memo.814282@cix.compulink.co.uk>
- X-Newsreader: TIN [version 1.1.8 PL6]
- Lines: 22
-
- Adam Pelled (apelled@cix.compulink.co.uk) wrote:
- > >---------[N_STPROG ]-----------------------------------------------
- > >If i want to follow a XBRA structure, i MUST peek inside EVERY program in
- > >the XBRA list.
- > >With MultiTOS/68030 programs will have memory protection, and if my program
- > >tries to look into some other programs occupied memory, the MMU of the
- > >68030 will generate a BUS ERROR to my program.
- > >
- > >The question is - Am i right or wrong about this ??
- > >-!-
- > > ! Origin: STacken BBS, Mj|lby, Sweden. +(46)142-19331. (90:1100/110)
- > >--------------------------------------------------------------------------
-
- Only TSRs should intercept OS vectors, thus effectively becoming a part of
- the OS. Now if every TSR has its 'global' flag set (i.e. announces that
- all its memory shall be public to other processes), everyone can follow
- the vector chain without any memory protection problems.
-
- --
- --clausb@hpbeo79.bbn.hp.com----------------------------------------------
- Claus Brod, MDD, HP Boeblingen Things. Take. Time. (Piet Hein)
- --#include <std_disclaimer>----------------------------------------------
-