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

[Mike Frysinger]

On Wed, Jul 15, 2009 at 06:37, David Howells wrote:
> Bernd Schmidt <bernds_cb1@xxxxxxxxxxx> 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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