SGX adds the ability to attest and seal individual enclaves, with a root attestation key in the CPU die: https://docs.google.com/file/d/0B_wHUJwViKDaSUV6aUcxR0dPejg/...

This key has some similarities to a TPM EK / AIK, but rather than PCRs for the measurements they have a cryptographic log of the enclave.