操作系統(tǒng)開發(fā) - BIOS常識

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(shè)定成原來的狀態(tài)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(jīng)設(shè)定好的設(shè)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(shù)能夠進(jìn)入保護(hù)模式，（我相信很多人也以為BIOS函數(shù)只可以停留在實(shí)模式裏）