Subject: Re: Using inb() and outb() from machine/pio.h
To: Dave Burgess <>
From: Bill Sommerfeld <>
List: current-users
Date: 01/19/2000 21:30:23
See i386_set_ioperm(2) and/or i386_iopl(2).

For (probably obvious) reasons, inb/outb are disabled for most stuff
in userspace, which is why you're getting the bus errors.

The two calls cited above can be used to enable i/o space access from
a process running as root.

					- Bill