【单选题】【消耗次数：1】
当硬件的中断装置发现有中断事件发生时，就会中断原来程序的执行，然后在CPU上执行的是操作系统的（）
①
系统调用程序
②
中断处理服务程序
③
系统核心程序
④
系统引导程序
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简述程序中断方式的中断服务子程序执行过程。
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中断处理过程包括关中断、保护现场、执行中断服务程序、[填空1]和开中断阶段
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