Softirqs were originally designed as a vector of 32 softirq entries supporting a variety of software interrupt behaviors.
软中断最初为具有 32 个软中断条目的矢量， 用来支持一系列的软件中断特性。
Resident operating system, usually held in low memory with interrupt vector.
为操作系统保留的部分，通常用中断矢量保存在内存低端。
If the serial interface is not able to generate an interrupt, set this value to any unused interrupt vector address.
如果串行接口是无法产生一个中断，将此值设置为任何未使用的中断向量地址。
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