Intel CPU modes of operation

I have a question about CPU modes of operation, specifically for Intel's Ivy Bridge line of processors. I've read that these processors have your common privileged mode and user mode, but there are also other modes that give certain amounts of access as well. I can't seem to find documentation on what modes these line of processors can operate in. Can someone point (link) me in the right direction or list the answer? Thanks.
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kj_syenceAsked:
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David Johnson, CD, MVPConnect With a Mentor OwnerCommented:
Intel's datasheet
Intel® Architecture Instruction Set Extensions Programming Reference

Haswell added Supervisor Mode Access Prevention
an SMAP enabled kernel will be prevented from accessing user memory
https://forums.grsecurity.net/viewtopic.php?f=7&t=3046
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