nx-bit and TPM

[Chuck Swiger]

On Mar 29, 2007, at 2:36 PM, Dag-Erling Smørgrav wrote:
>> I'm was looking through handbook and wikipedia and it appears FreeBSD
>> doesn't support hardware (nor software) nx bit.
>> There also doesn't seem to be any support for TPM (Trusted  
>> Platform Module).
>
> I believe NX support was never implemented because Intel's version of
> AMD64 didn't support it.  As for TPM, I don't see the point.

Intel supports the same capability in newer revisions of their EM64T  
CPUs, but they call it the "XD" bit instead (for eXecute Disabled).   
There's a reasonable set of documentation here:

   http://en.wikipedia.org/wiki/NX_bit#FreeBSD

-- 
-Chuck