Initialize status register A.Initializes data variables that are based on CMOS setup questions.Initializes both the 8259 compatible PICs in the system.

• ) ；并载入上电默认的参数设置；初始化状态寄存器(如同在BIOS设置的选项:载入默认的设置)；同时初始化8259(中断优先级).