IDT是一个有256个入口的线形表，每个IDT的入口是个8字节的描述符，所以整个IDT表的大小为256*8=2048 bytes，每个中断向量关联了一个中断

处理过程。所谓的中断向量就是把每个中断或者异常用一个0-255的数字识别-IDT is a linear table 256 entry, each IDT entry is 8-byte descr iptors, so the size of the IDT table 256* 8 = 2048 bytes, each interrupt vector associated with an interrupt handler. The so-called interrupt vector for each interrupt or exception is to use a 0-255 number recognition