Subject: Re: the prom: to map or not to map
To: Jason Brazile <firstname.lastname@example.org>
From: Chris G. Demetriou <email@example.com>
Date: 06/12/1997 11:11:31
> > At system startup time, the firmware is living in a known location in
> > VA space: that covered by the first L1 PTE. Therefore, I squirrel
> > that away, and when necessary swap it with the 'normal' first L1 PTE
> > of the running process, do the firmware access, then swap it back.
> Hmm, the PTE of the running process.
yeah. it's expensive (translation buffer invalidate!) and ugly, but
That technique is only used on systems which don't have 'native'