Re: OS/2 device drivers

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#2535

From: Peter Forsberg
Date: Thu, 11 Apr 1991 21:24

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In article <1991Apr10.211127.13982@hpmcaa.mcm.hp.com> winter@hpmcaa.mcm.hp.com (Kirt Alan Winter) writes:
   cale@lut.fi (Antti Kirmanen) writes:
   > 
   > I'm currently trying to write a device driver for OS/2.
   > My problem is, that I should use inp and outp functions to
   > communicate with a port. OS/2 programmers reference manual
   > says, that I should use DosPortAccess() function call but then ...
   > Program crashes allways in the first outp() or inp() call.
   > I'm using Microsoft C 6.0 with OS/2 1.1
   > 
   > Can anyone help me. A simple example would be great.
   > Thanks in advance....

The reason that you should use the DosPortAccess() API is *portability*.
In OS/2 2.0 32-bit programs neither IOPL-segments, nor the C-functions
inp() or outp() will be supported. This is because this is very hardware-
specific stuff, and will be hard to support in (possible) future versions
of OS/2 on hardware platforms other than the i[34]86 ("New Technology").
Just for your info...

/ Peter Forsberg  (RIT & IBM Sweden)
--
_______________________________________________________________________________
Peter Forsberg 		      Royal Institute of Technology, Stockholm, Sweden.
Internet: d88-pfo@nada.kth.se
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!rpi!uwm.edu!bionet!agate!ucbvax!bloom-beacon!eru!kth.se!cyklop.nada.kth.se!news
From: d88-pfo@dront.nada.kth.se (Peter Forsberg)
Newsgroups: comp.os.os2.programmer
Subject: Re: OS/2 device drivers
Message-ID: <D88-PFO.91Apr11232455@dront.nada.kth.se>
Date: 11 Apr 91 21:24:54 GMT
References: <1991Apr09.151935.19325@lut.fi>
 <1991Apr10.211127.13982@hpmcaa.mcm.hp.com>
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Organization: Royal Institute of Technology, Stockholm, Sweden
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In-reply-to: winter@hpmcaa.mcm.hp.com's message of 10 Apr 91 21:11:27 GMT

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