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Date: Thu, 18 Nov 1999 10:35:01 -0600 (CST)
From: "M. R. Brown" <marcusb AT csd DOT uwm DOT edu>
To: Philippe PUJAS <Philippe DOT Pujas AT iutbeziers DOT univ-montp2 DOT fr>
cc: cygwin AT sourceware DOT cygnus DOT com
Subject: Re: IO PORT ACCESS UNDER NT
In-Reply-To: <3.0.1.32.19991117173745.00971920@194.199.229.198>
Message-ID: <Pine.OSF.3.96.991118102959.22417A-100000@alpha3.csd.uwm.edu>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII

NT by its nature doesn't allow direct hardware access to _ANY_ user
program, only device drivers are allowed to get low-level with your
hardware, and writing one is not a walk in the park :)  You can search the
net for a generic NT device driver that allows arbitrary I/O port access
using IOCTLs, or you can roll your own.  Even the practice of writing
directly to I/O ports is depreciated under Windows 9x, as 9x "attempts" to
do some hardware management.  To my knowledge, cygwin doesn't support any
functions regarding ioport access (think about it, does VC++ have any
methods of rw I/O ports?).

Marcus

On Wed, 17 Nov 1999, Philippe PUJAS wrote:

> I want to manage directly ioport from inp/outp (inb,outb) commands under
> 
> Cygwin20.1/NT4.
> 
> 1st These instructions don't exist on Cygwin20.1
> 
> 2nd I try the assembler routines from the FAQ and I get the following
> 
> message : handle_exceptions: Exception STATUS_PRIVILEGED_INSTRUCTION
> 
> 
> 
> Thank you for your help.
> 


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