mailbox其实是多核处理器soc上，核与核之间互相发中断的机制，由于核与核之间可能存在不同的业务，故硬件上设计分配一两个中断已经无法满足业务的需求，软件拓展起来很困难，所以mailbox可以理解为软件可自由定义的中断模块。

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