Re: [Uclinux-dist-devel] [PATCH v2] NOMMU: add support for Memory Protection Units (MPU)

[Mike Frysinger]

On Wed, Jul 15, 2009 at 07:45, David Howells wrote:
> Mike Frysinger wrote:
>> there is full 4k page protection between processes and between the
>> kernel and processes.
>
> So you have a separate bitmap per process?

yes, you can see page_rwx_mask in our mmu.h's mm_context_t.  this is
what the protect_page/update_protections operate on.  we have a global
current_rwx_mask that gets updated during context changes and the CPLB
miss handler uses that to keep things simple.
-mike
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