Date: Mon, 01 Jan 1996 12:36:59 +0530 From: A JOSEPH KOSHY <koshy@india.hp.com> To: hackers@freebsd.org Subject: IOPerms (was Re: /dev/io) Message-ID: <199601010707.AA013100019@fakir.india.hp.com>
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Whilst on the discussion on the use of /dev/io ... Things that can be said for the use of I/O permission bitmaps: a. You can control the useage of i/o ports by processes. This is useful in trapping programming errors leading to inadvertant accesses to critical ports etc. It also helps keep your confidence in your system high :). b. Its my guess that using the I/O permission bitmaps would help in implementing VM86 mode, specially when manipulating multiple VM86 tasks all attempting to access the hardware. Koshy
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