Although the kernel may accept a new interrupt signal while handling a previous one, some critical regions exist inside the kernel code where interrupts must be disabled.
尽管内核可以在执行一个中断时，接收一个新的中断信号，内核代码中存在一些临界区域，这里中断必须关闭。
If high priority interrupts are not disabled during low priority interrupts, users must save the key registers in software during a low priority interrupt.
如果在响应低优先级中断时高优先级中断使能，用户必须在低优先级中断响应程序中保存那些关键的寄存器值。
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