驱动开发，涉及了调用门，中断门，任务门，和陷阱门等等，特别是对调用门的讲解，因为可以实现内核权限的切换。常用于黑客编程。-Driven development, involving a call gate, interrupt gate, task gate, and trap doors, etc., especially on the door called to explain, because you can achieve core competence of the switch.