linux-kernel - Re: Reserving a fixed physical address page of RAM.

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Message-id: <456B8517.7040502@shaw.ca>
Date:	Mon, 27 Nov 2006 18:38:47 -0600
From:	Robert Hancock <hancockr@...w.ca>
To:	linux-kernel@...r.kernel.org
Cc:	Jon Ringle <JRingle@...tical.com>
Subject: Re: Reserving a fixed physical address page of RAM.

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@...pamshaw.ca
Home Page: http://www.roberthancock.com/

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