Virtual Memory Management in x86

System Developer Manuals:
http://www.intel.com/content/www/us/en/processors/architectures-software-developer-manuals.html

Condensed picture:
http://osr507doc.sco.com/en/OSAdminG/addr_trans.html

Some more explanation:
http://www.cs.cmu.edu/~410/doc/segments/segments.html

When is LDT used?
http://en.wikipedia.org/wiki/Local_Descriptor_Table

http://stackoverflow.com/questions/4575032/reason-for-different-segments-in-linux-on-x86