umtx/libthr SMP fixes.

[Terry Lambert]

Bryan Liesner wrote:
> A non disclosure agreement is a non disclosure agreement, so no crap
> from me.
> 
> I'll give that a try and see if it makes a difference. I don't
> remember off of the top of my head from the previous posts on this
> subject, but does this bug apply to an Athlon XP as well?

The PSE bug applies to all CPU's that support 4M pages; it is
a hardware bug.  The PG_G is a seperate order of operation
problem that gets workked around by disabling it; it is a
software bug.

-- Terry