说明：  <自己动手写操作系统>这本书的电子版，是学习操作系统的经典书籍，看了此书，您就可以编写属于自己的操作系统了。强烈推荐
(<Do-It-Yourself to write the operating system> This electronic version of this book is a classic book to learn the operating system, read this book, you can write their own operating system. Strongly recommend)