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Date: Fri, 27 Jul 2001 04:02:04 +0200
To: cygwin AT cygwin DOT com
From: Gunnar Andre Dalsnes <hardon AT online DOT no>
Subject: Re: Read/write IO ports on NT
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At 24.07.01 12:15 , you wrote:
>Hi
>
>Trying to read and write directly at IO port on NT, using the following code
>
>int main()
>{
>  __asm("mov $1, %al");
>  __asm("mov $0x3f8, %dx");
>  __asm("out %al, %dx");
>  return 0;
>}
>
>also tried
>
>int main()
>{
>  _outp(0x378, 1);
>  return 0;
>}
>
>but get the following exception, Privileged instruction.
>Any suggestions or pointers of how to code this.
>
>Clive Mayo

You need a kernel-mode device driver to do this.
Get sample source from Dr. Dobb's Journal.
ftp://ftp.ddj.com/1996/1996.05/directio.zip

Gunnar.


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