linux-kernel - Re: Reading a physical memory location

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Date:	Wed, 11 Jul 2007 12:50:20 +0400
From:	"Manu Abraham" <abraham.manu@...il.com>
To:	"Nobin Mathew" <nobin.mathew@...il.com>
Cc:	"vraghavan3@...l.gatech.edu" <vraghavan3@...l.gatech.edu>,
	linux-kernel@...r.kernel.org
Subject: Re: Reading a physical memory location

On 7/11/07, Nobin Mathew <nobin.mathew@...il.com> wrote:
> See this in the documentation
>
> The returned virtual address is a current CPU mapping for the memory
> address given. It is only valid to use this function on addresses that
> have a kernel mapping
>
> This function does not handle bus mappings for DMA transfers. In
> almost all conceivable cases a device driver should not be using this
> function
>

To get a better idea, look here
http://tldp.org/LDP/khg/HyperNews/get/devices/addrxlate.html
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