LAPIC_ESR
i82489_writereg(LAPIC_ESR, 0);
(void)i82489_readreg(LAPIC_ESR);
esr = i82489_readreg(LAPIC_ESR);
i82489_writereg(LAPIC_ESR, 0);
(void)i82489_readreg(LAPIC_ESR);
esr = i82489_readreg(LAPIC_ESR);