自己动手写操作系统，小练习包括fifo.c\fork.c\popen.c等，保护模式，超过1M内存管理模式，等代码，生成的中间文件等，适合初学者参考！-Do-it-yourself write operation system, small exercises include fifo. C \ fork. C \ popen. C, and other protection mode, more than 1 M memory management mode, and the code, ge