For some of the interrupts such as the APIC timer interrupt and NIC interrupt, interrupt handling procedures are directly set in the interrupt descriptor table, in order to provide deterministic interrupt response time. 把一些中断例如APIC和网卡中断的中断处理程序直接注册在中断描述符表中,这样可以得到确定的中断响应时间。
Booting module gets information of the computer and configures the global descriptor table, interrupt descriptor table and page directory, after this, it use long jump instruction to go into protected mode. 内核引导完成的主要功能是从磁盘上把内核装载至内存,读取系统硬件参数,设置全局描述符表、中断描述符表和页目录表,利用长跳转指令,从实模式切入保护模式。