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    SubjectRe: [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@t-online.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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