From: Val Henson <val@nmt.edu>
To: benh@kernel.crashing.org
Cc: linux-kernel@vger.kernel.org
Subject: Re: Athlon/AGP issue update
Date: Fri, 25 Jan 2002 11:34:43 -0700 [thread overview]
Message-ID: <20020125113443.C26874@boardwalk> (raw)
In-Reply-To: <20020123.060855.26275529.davem@redhat.com> <20020123154737.19204@mailhost.mipsys.com>
In-Reply-To: <20020123154737.19204@mailhost.mipsys.com>; from benh@kernel.crashing.org on Wed, Jan 23, 2002 at 04:47:37PM +0100
On Wed, Jan 23, 2002 at 04:47:37PM +0100, benh@kernel.crashing.org wrote:
> >I don't think your PPC case needs the kernel mappings messed with.
> >I really doubt the PPC will speculatively fetch/store to a TLB
> >missing address.... unless you guys have large TLB mappings on
> >PPC too?
>
> Yes, we use BATs (sort of built-in fixed large TLBs) to map
> the lowmem (or entire RAM without CONFIG_HIGHMEM).
Looking at bat_mapin_ram, it looks like we only map the first 512MB of
RAM with BATs, so we actually map the 512MB - 768MB range with PTEs
(and highmem starts at 768MB). Two of the DBATs are used by I/O
mappings, so that only leaves two DBATs of 256MB each to map lowmem
anyway. Am I missing something?
By the way, does the "nobats" option currently work on PowerMac?
-VAL
next prev parent reply other threads:[~2002-01-25 18:35 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-01-23 9:52 Athlon/AGP issue update Daniel Robbins
2002-01-23 10:18 ` David S. Miller
2002-01-23 2:46 ` benh
2002-01-23 14:08 ` David S. Miller
2002-01-23 15:47 ` benh
2002-01-25 18:34 ` Val Henson [this message]
2002-01-26 0:20 ` Benjamin Herrenschmidt
2002-01-27 19:22 ` Val Henson
2002-01-27 19:32 ` Benjamin Herrenschmidt
2002-01-23 16:31 ` Albert D. Cahalan
2002-01-23 16:57 ` Daniel Robbins
2002-01-23 17:14 ` benh
2002-01-23 23:14 ` Albert D. Cahalan
2002-01-25 18:17 ` Val Henson
2002-01-23 19:20 ` Oliver Neukum
[not found] ` <200201231010.g0NAAuE05886@Port.imtp.ilyichevsk.odessa.ua>
2002-01-23 10:24 ` David S. Miller
2002-01-23 10:31 ` Rik van Riel
2002-01-23 11:39 ` David S. Miller
2002-01-23 11:39 ` William Lee Irwin III
2002-01-23 11:47 ` David S. Miller
2002-01-23 17:09 ` Albert D. Cahalan
2002-01-23 18:38 ` David S. Miller
-- strict thread matches above, loose matches on Subject: below --
2002-01-23 10:38 Studierende der Universitaet des Saarlandes
2002-01-23 11:44 ` David S. Miller
2002-01-23 12:32 ` Momchil Velikov
2002-01-23 12:34 ` David S. Miller
2002-01-23 12:41 ` Momchil Velikov
2002-01-23 14:50 ` Manfred Spraul
2002-01-23 11:44 ` David Woodhouse
2002-01-23 11:49 ` David S. Miller
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