From: erik quanstrom <quanstro@coraid.com>
To: 9fans@9fans.net
Subject: Re: [9fans] ugliness in vesa
Date: Tue, 14 Jul 2009 12:49:47 -0400 [thread overview]
Message-ID: <7a42f4b097199fba129f9b3067746968@coraid.com> (raw)
In-Reply-To: <7d3530220907140923s590847dcs2128ca4e33dcc13f@mail.gmail.com>
> As I'm reading it, the change to vganvidia.c you posted above
> (re-pasted below) does pat stuff. Am I confused? I don't think pat and
> mtrr are the same thing...
they're not. mtrr operates at the physical address level and
it's just a bunch of registers that control caching of a (limited set of)
fixed and variable ranges. pat on the other hand, works on
page tables (and directories).
however the net result is that for pci space (or the vga ap)
which is normally UC (or is it UC-), if you use a mtrr range to
mark it as WT or pat entries to market it as WT, there is no
difference.
- erik
next prev parent reply other threads:[~2009-07-14 16:49 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-07-13 23:57 john
2009-07-14 2:42 ` erik quanstrom
2009-07-14 5:23 ` John Floren
2009-07-14 12:06 ` erik quanstrom
2009-07-14 16:03 ` John Floren
2009-07-14 16:10 ` erik quanstrom
2009-07-14 16:23 ` John Floren
2009-07-14 16:49 ` erik quanstrom [this message]
2009-07-14 4:42 ` lucio
2009-07-14 6:24 ` cinap_lenrek
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