操作系统开发 - BIOS常识

BIOS calls may use interrupts, which means that you need to forward IRQs or map the PIC back to its original configuration.BIOS可能會用到中斷，就是說中斷過後你要自己把PIC重新設定成原來的狀態BIOS calls may access devices that you have already configured - notably the PIT and PICBIOS可能會存取一些你已經設定好的設備, 尤其是PIT和PICBIOS calls can enter protected mode on their own to access MMIO registers, which is beyond the limits of virtual 8086 mode.BIOS函數能夠進入保護模式，（我相信很多人也以為BIOS函數只可以停留在實模式裏）