linux-kernel - Re: how to use TLB to prevent Linux accessing a particular memory region

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Message-ID: <Pine.LNX.4.64.0710161001550.21385@pixie.tetracon-eng.net>
Date:	Tue, 16 Oct 2007 10:13:38 -0400 (EDT)
From:	"J. Scott Kasten" <jscottkasten@...oo.com>
To:	veerasena reddy <veerasena_b@...oo.co.in>
cc:	"linux-kernel.org" <linux-kernel@...r.kernel.org>,
	linux-mips <linux-mips@...ux-mips.org>
Subject: Re: how to use TLB to prevent Linux accessing a particular memory
 region 


Really, it sounds more like you want a custom driver that "owns" that 
region of memory so it's marked as used and this driver is the gate 
keeper.  I wonder if the console frame buffer driver for the mips ip32 
arch might be a good example for you as it swallows a several meg chunk of 
memory for the display.

-S-

On Tue, 16 Oct 2007, veerasena reddy wrote:

> Hi,
>
> I have a board, which has two processors ( one is MIPS
> on which Linux-2.6.18 kernel runs and another is DSP
> based processor) and 32MB DDR.
>
> Out of 32MB of DDR 8MB is reserved for use by DSP
> processor. But the MIPS processor downloads firmware
> into this reserved memory for the DSP.
>
> Now, is it possible to use the TLB to prevent Linux
> from accessing the reserved memory after the firmware
> has been downloaded?
>
> Also we'd need to remove those TLB entries if the
> firmware would ever need to be reloaded to the DSP'
> memory region.
>
> What are the APIs to be used to achieve the above?
>
>
> Thanks in advance.
>
> Regards,
> Veerasena.
>
>
>      5, 50, 500, 5000 - Store N number of mails in your inbox. Go to http://help.yahoo.com/l/in/yahoo/mail/yahoomail/tools/tools-08.html
>
>
-
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