Support for 64bit userspace.

[Jayachandran C.]

On Wed, Jul 28, 2010 at 2:04 AM, Jayachandran C.
<c.jayachandran at gmail.com> wrote:
> Here's my initial work to get 64bit user space.  With this set of
> changes, I can boot to the single user shell with n64 /sbin/init and
> /bin/sh.  There are still issues to fix, and the dynamic loader is
> still not working, but I think this would be a good time to get some
> initial feedback.

The dynamic loader seems to work after some straight-forward changes.
The only change is that the got[1] entry needs to be 64-bit.  The
changes are attached.

There is still an occasional kernel panic in n64, which I need to
track down - but I think the changes other than pmap.c/pmap64.c are
ready for check in.  I would like some feedback on pmap64.c I can
clean it up for check in.

Thanks,
JC.
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