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。
The process of generating dimension chain does reflect the kernel of assembly function.
尺寸链的形成过程反映了装配函数的核心内容。
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