自己动手写操作系统, 教你一步一步来写一个简单的操作系统, 可能有点偏门, 但是从另外一条路上指明了如何来搞操作系统.-Write the operating system yourself, teach you step by step to write a simple operating system, may be a little side door, but a road from another operating system specifies how to carry out