Driven on the device side. The device sends a hardware signal (by generating an interrupt) to the kernel when it needs the kernel's attention.
设备驱动模式，在设备须要内核关注时，由设备主动发送一个硬件信号(通常是通过一个中断)给内核。
Attention please, we interrupt this program, with some disturbing news.
注意了。令人不安的消息打断了这个计划。
Excuse me. Sorry to interrupt, but can I have your attention please? Ok, hi, my niece is somewhere in this building.
抱歉打扰一下，大家能不能听我说一句？好了，我的外甥女就在你们之中。
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