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

[Jim Brooks]

> 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?

Well, even if you did remap PTEs (TLBs are N/A),
or claimed that special memory, that may be too late.
The kernel might've already allocated
and stomped over it.

A reliable way is to redefine the kernel's "memory
map"
which takes effect during boot.
Look for the memory map as a .h in arch/ (IIRC).

--
Jim Brooks


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