Because if we just pass in this one extra piece of information which is
normally already available in the driver, we can avoid a whole lot of ugly
cruft in the out-of-line functions by plugging in the correct out-of-line
function to match the resource.
> The multiple bus stuff is a port specific detail hidden behind
> readb() and friends.
The alternative view is that the _single_ bus stuff is a port-specific
detail which has permeated all the drivers and forced the non-i386
architectures' I/O functions to have to try to work out which bus they're
talking to when the driver could have just passed that information to them.
-- dwmw2
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