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Re: A Question to throw at you guys

From: Christian Helmuth
Subject: Re: A Question to throw at you guys
Date: Tue, 14 Nov 2006 10:44:41 +0100
User-agent: Mutt/1.5.12-2006-07-14


On Mon, Nov 13, 2006 at 10:36:34AM +0100, Tom Bachmann wrote:
> > [...]
> > What if a DDL (Driver Description Language) framework could be devised
> > that was easy to learn and write for? Included modern mechanisms to
> > capture programming errors. Was only allowed to be linked to the device
> > that it was to be operating.
> How would you expect that to work? The problem, as you stated above, is
> _not_ that we cannot limit what the driver is allowed to do, but that we
> have to believe it that it really needs the capabilities it asked for.

IMO the required capabalities for a driver to work can be derived from the
I/O resource and device structure. So devices attached to buses are
dominated by the bus drivers (which may be dominated by host drivers or
bus drivers again, e.g. PCI - USB - USB device). This requires more trust
into bus drivers than into drivers for the attached devices, but could
help to design a trusted driver tree. Opinions?

Christian Helmuth

TU Dresden, Dept. of CS
Operating Systems Group

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