（操作系统实验和课程设计）掌握增加设备驱动程序的方法。通过模块方法，增加一个新的设备驱动程序，其功能可以简单。实现字符设备的驱动 -(Experimental operating system and curriculum design) add device drivers to master methods. Through modular approach, adding a new device driver, its functionality can be easy. Achie