From: subingangadharan@gmail.com (subin gangadharan)
To: kernelnewbies@lists.kernelnewbies.org
Subject: identity mapped paging
Date: Tue, 19 Jun 2012 02:23:28 -0700 [thread overview]
Message-ID: <CAKRO8zJvvM8JXzqD+cyUEwbe3jRhXKThMeh=_0HTMsHcz4H7jw@mail.gmail.com> (raw)
In-Reply-To: <CAKuUYSy-j5HogDpg0-9j5RrVSPbNObBDKqafBEPgCTjHO2twFA@mail.gmail.com>
Hi Vaibhav,
> identity mappings no longer useful.According to this article
> http://geezer.osdevbrasil.net/osd/mem/index.htm#identity?- "The page table
> entries used to identity-map kernel memory can be deleted once paging and
> virtual addresses are enabled." Can somebody please explain?
I don't have a good idea on this. But my guess is, these entries has
to there to enable MMU. Because after enabling it you are still in the
same address space. Basically kernel needs an x to x
translation(identity mapping) before kernel do the jump to the virtual
space (0xc000 0000), after that those entries are not needed any
more.
Will wait for our kernel experts comments.
>
> Thanks
> Vaibhav Jain
>
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies at kernelnewbies.org
> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>
--
With Regards
Subin Gangadharan
I am not afraid and I am also not afraid of being afraid.
next prev parent reply other threads:[~2012-06-19 9:23 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-11 21:22 identity mapped paging Vaibhav Jain
2012-06-19 9:23 ` subin gangadharan [this message]
2012-06-19 15:54 ` Dave Hylands
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