(WIP) tiny 32-bit OS in D and GAS requirements LDC GCC QEMU make run ref http://lv4.hateblo.jp/archive/category/%E8%87%AA%E4%BD%9COS http://qiita.com/kotetuco/items/54af67d5663013ad0db7 http://www.ertl.jp/~takayuki/readings/c/no09.html