Path: utzoo!mnetor!tmsoft!torsqnt!news-server.csri.toronto.edu!bonnie.concordia.ca!uunet!shelby!agate!pasteur!johnm@cory.Berkeley.EDU
From: johnm@cory.Berkeley.EDU (John D. Mitchell)
Newsgroups: comp.lang.c
Subject: Re: DS != SS in Turbo C 2.0
Summary: Upgrade!
Message-ID: <10875@pasteur.Berkeley.EDU>
Date: 7 Feb 91 15:10:47 GMT
References: <1991Feb7.105811.17817@computing-maths.cardiff.ac.uk>
Sender: news@pasteur.Berkeley.EDU
Reply-To: johnm@cory.Berkeley.EDU
Lines: 19

In article <1991Feb7.105811.17817@computing-maths.cardiff.ac.uk> rhl@computing-maths.cardiff.ac.uk (Robert Hartill) writes:
>I want to use Turbo C's small memory model to write Interrupt Service Routines
>for an operating system..

>Since the ISRs are to use tasks stack space, their DS and SS are going to be
> different, but TC assumes their the same. I want the ISRs to access kernel
> data via DS (which never changes), so changing DS to SS inside the ISR isn't
> good enough.
[...deleted...]
>What I need is a compier option *SS!=DS*, which is found on other compilers...

Upgrade to TC++ v1.0x (current version, akz TC v3.0x).  The compiler now
supports some switches so you can expressly request SS == or != DS.  Since
you can do this on a module by module basis none of you other code need be
screwed (oops sorry about that technical terminology :-).

Good luck,
	John
	johnm@cory.Berkeley.EDU