以下关于中断的叙述中,不正确的是()。
- A.中断处理过程包括中断响应、中断处理和中断恢复
- B.中断响应由硬件、软件共同完成
- C.中断响应时,软件完成程序状态字的交换
- D.中断处理完全由操作系统完成,按情况执行不同的中断处理例程
正确答案及解析
正确答案
解析
本题考查中断响应的基础知识。中断响应是一个软硬件结合起来处理系统例外事件的机制。硬件响应中断时,进行新老程序状态字的交换。所谓程序状态字,是指CPU的一些重要寄存器内容的有序集合。老程序状态字是指系统正在运行时的程序状态字,新程序状态字是指存放在内存制定单元的程序状态字,新程序状态字中的指令地址寄存器就是操作系统的入口地址。通过交换程序状态字,系统转入运行操作系统的程序。中断处理的工作将由操作系统完成。操作系统判别产生中断的原因,根据中断的原因调用相应的中断处理例程,完成中断处理。在中断处理结束后,再运行进程管理中的进程调度程序,将某个进程运行时的程序状态字内容填入相应的硬件寄存器中,从而使该进程投入运行。
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