From owner-freebsd-hackers  Thu Apr 16 14:01:31 1998
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Date: Thu, 16 Apr 1998 14:01:38 -0700 (PDT)
From: Bernie Doehner <bad@uhf.wireless.net>
To: Mike Smith <mike@smith.net.au>
cc: Bernie Doehner <bad@ece.WPI.EDU>, hackers@FreeBSD.ORG, buaas@wireless.net,
        bad@ece.WPI.EDU
Subject: Re: Documentation of 2.2.5-RELEASE and 3.0 memory protection? 
In-Reply-To: <199804162026.NAA01011@dingo.cdrom.com>
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[...]
> > if_ed driver (some cards use shared memory, but in the ISA hole of
> > A0000-100000), to the Digiboard driver (which I thought uses shared
> > memory, but BELOW A0000). 
> 
> I don't understand you here - drivers are *inside* the kernel, and 
> behave completely differently to user-mode programs.

> Are you writing a driver, or a user-mode program?  This is a critical 
> difference.

Using used too loose a definition. Our stuff is ALL user-mode programs
currently and it appears to work (with one program using monochrome range
for shared-memory, and the other using ISA hole memory)

But we'd like to understand the kernel mechanisms better so that we can
move/some of it into the kernel and turn it into real device drivers.


Bernie


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