nx-bit and TPM

[Igor]

Hello,
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 was wondering if it is due to a general lack of interest and/or
personal preference (gcc?) or are there other issues. The reason I'm asking
is I'm currently doing a MSc degree in Information Security and was
looking into optionally implementing both of the above for FreeBSD as part
of my thesis. I would appreciate any input regarding usefulness of such
thing.
Regards,
Igor.