This HOWTO document describes programming hardware I/O ports and waiting for small periods of time in user-mode Linux programs running on the Intel x86 architecture. This document is a descendant of the very small IO-Port mini-HOWTO by the same author.
This document is Copyright 1995-1997 Riku Saikkonen. See the Linux HOWTO copyright for details.
If you have corrections or something to add, feel free to e-mail me
(Riku.Saikkonen@hut.fi)...
Changes from the previous released version (Mar 30 1997):
inb_p/outb_p and port 0x80.udelay(), since nanosleep()
provides a cleaner way of using it.
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