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

["J. Scott Kasten" <jscottkasten@yahoo.com>]

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.
>
>
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