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Please check the following link where you will find manuals/documentation regarding the Intel® 64 and IA-32 Architectures:
Intel® 64 and IA-32 Architectures Software Developer Manuals
In case you have questions regarding the manuals found in the link provided above or if you are unable to find an answer for your question, I recommend you to open a new thread in the Intel® Developer Zone Forums
Hope this information helps.