x64アーキテクチャ向けの自作OS
x64アーキテクチャの公式リファレンス
•AMD64 Architecture Programmer’s Manual
Developer Guides & Manuals AMD
http://developer.amd.com/resources/documentation-articles/developer-guides-manuals/
Intel(R) 64 and IA-32 Architectures Software Developer's Manual
http://www.intel.com/content/www/us/en/processors/architectures-software-developer-manuals.html
日本語の資料(古いかも)
http://www.intel.co.jp/content/www/jp/ja/developer/download.html
Assembly Programming on x86-64 Linux
http://www.mztn.org/lxasm64/amd00.html
x86-64 Tour of Intel Manuals
http://x86asm.net/articles/x86-64-tour-of-intel-manuals/
・自作x64向けOSのソース
ReturnInfinity-BareMetal-OS · GitHub
https://github.com/ReturnInfinity/BareMetal-OS