Date: Mon, 27 Nov 2006 18:38:47 -0600
From: Robert Hancock <hancockr@shaw.ca>
Subject: Re: Reserving a fixed physical address page of RAM.
In-reply-to: <fa.LC2HgQx8572p2lwOKfUm6cxg95s@ifi.uio.no>
To: linux-kernel@vger.kernel.org
Cc: Jon Ringle <JRingle@vertical.com>
Message-id: <456B8517.7040502@shaw.ca>
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Jon Ringle wrote:
> Hi,
> 
> I need to reserve a page of memory at a specific area of RAM that will
> be used as a "shared memory" with another processor over PCI. How can I
> ensure that the this area of RAM gets reseved so that the Linux's memory
> management (kmalloc() and friends) don't use it?
> 
> Some things that I've considered are iotable_init() and ioremap().
> However, I've seen these used for memory mapped IO devices which are
> outside of the RAM memory. Can I use them for reseving RAM too?
> 
> I appreciate any advice in this regard.

Sounds to me like dma_alloc_coherent is what you want..

-- 
Robert Hancock      Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@nospamshaw.ca
Home Page: http://www.roberthancock.com/

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