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From
SubjectRe: HELP: Linux replacement for "DOS diagnostic" station
Date
Followup to:  <404CFF03.1090601@techsource.com>
By author: Timothy Miller <miller@techsource.com>
In newsgroup: linux.dev.kernel
>
> So, first of all, we need to make /dev/mem accessible to all users.
> Secondly, we need some mechanism to access I/O and config space, but it
> can be indirect through ioctl.
>
> Is there a driver for Linux which supports I/O and config space access
> for user-space programs in a completely generic way?
>

Just use iopl(3) and do the accesses directly from userspace, or use
/dev/port.

-hpa
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