Subject: Re: mmap'ing framebuffer memory in MI drivers...
To: Anders Magnusson <firstname.lastname@example.org>
From: Jason Thorpe <email@example.com>
Date: 03/04/1999 14:00:13
On Thu, 4 Mar 1999 22:22:00 +0100 (MET)
Anders Magnusson <firstname.lastname@example.org> wrote:
> Not likely :-) but maybe the page tables that maps the framebuffer
> gets paged out.
Well, more like devices aren't really "wired" memory. The pmap is allowed
to forget those mappings at any time, as it sees fit.
Say, for example, a process which has mapped the frame buffers is _swapped_
out. The Alpha pmap will then free all of its page tables. You need to be
able to reestablish the mapping for individual pages later, when that process
-- Jason R. Thorpe <email@example.com>