From: "Gerhard Pircher" <gerhard_pircher@gmx•net>
To: Benjamin Herrenschmidt <benh@kernel•crashing.org>
Cc: linuxppc-dev@ozlabs•org, debian-powerpc@lists•debian.org
Subject: Re: Unmapping pages from the linear addressing without HIGHMEM support
Date: Sat, 11 Mar 2006 14:28:22 +0100 (MET) [thread overview]
Message-ID: <20006.1142083702@www079.gmx.net> (raw)
In-Reply-To: 1142032411.4057.31.camel@localhost.localdomain
> --- Ursprüngliche Nachricht ---
> Von: Benjamin Herrenschmidt <benh@kernel•crashing.org>
> An: Gerhard Pircher <gerhard_pircher@gmx•net>
> Kopie: linuxppc-dev@ozlabs•org, debian-powerpc@lists•debian.org
> Betreff: Re: Unmapping pages from the linear addressing
> without HIGHMEM support
> Datum: Sat, 11 Mar 2006 10:13:30 +1100
>
> > That would mean I cannot reuse the code in dma-mapping.c, right?
> > Killing the BAT mappings or limiting the memory size covered by the
> > BATs seems to be fairly easy, but I guess I have to setup my own page
> > table for the reserved DMA memory area and implement my own
> > alloc_pages() function!?
>
> No, just limit the size of the BAT mapping and mark some of the top
> pages of the address space reserved... That should be enough.
>
Okay, I will try that first. Marking some of the pages as reserved sounds
like the code you implemented for the uninorth_agp driver with this
"agp_special_page". I guess I still have to modify the code in dma_mapping.c
to use the reserved address space for the consistent memory allocation
(CONSISTENT_BASE, CONSISTENT_END)?
Thanks again!
Gerhard
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next prev parent reply other threads:[~2006-03-11 13:28 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-03-09 13:51 Unmapping pages from the linear addressing without HIGHMEM support Gerhard Pircher
2006-03-09 22:11 ` Benjamin Herrenschmidt
2006-03-10 9:09 ` Gerhard Pircher
2006-03-10 12:59 ` Dan Malek
2006-03-10 23:12 ` Benjamin Herrenschmidt
2006-03-10 23:13 ` Benjamin Herrenschmidt
2006-03-11 13:28 ` Gerhard Pircher [this message]
2006-03-12 0:07 ` Benjamin Herrenschmidt
[not found] <31042.1141997321@www088.gmx.net>
2006-03-10 13:31 ` Gerhard Pircher
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