tboot (Intel TXT)

http://sourceforge.net/projects/tboot

Trusted Boot (tboot) is an open source, pre- kernel/VMM module that uses Intel(R) Trusted Execution Technology (Intel(R) TXT) to perform a measured and verified launch of an OS kernel/VMM.

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Intel® Trusted Execution Technology
http://www.intel.com/technology/security/index.htm

Intel Trusted Execution Technology specification
http://download.intel.com/technology/security/downloads/31516804.pdf