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

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Message-ID: <8bd0f97a0907150455l59a86540l655604579ab70b4f@mail.gmail.com>
Date:	Wed, 15 Jul 2009 07:55:18 -0400
From:	Mike Frysinger <vapier.adi@...il.com>
To:	David Howells <dhowells@...hat.com>
Cc:	Bernd Schmidt <bernds_cb1@...nline.de>,
	uclinux-dist-devel@...ckfin.uclinux.org,
	linux-kernel@...r.kernel.org
Subject: Re: [Uclinux-dist-devel] [PATCH v2] NOMMU: add support for Memory 
	Protection Units (MPU)

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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