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

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Message-ID: <8bd0f97a0907150412h234cf4d6l439d92d832055373@mail.gmail.com>
Date:	Wed, 15 Jul 2009 07:12:20 -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 06:37, David Howells wrote:
> Bernd Schmidt <bernds_cb1@...nline.de> wrote:
>> No page table, just three bitmaps (r/w/x), with one bit per page, per mm.
>
> I presume that all you do is maintain a distinction between
> userspace-accessible areas and kernel-only areas, and don't prevent userspace
> processes from destroying each other.

there is full 4k page protection between processes and between the
kernel and processes.
-mike
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