I8259_INTR_NUM
if (irq >= I8259_INTR_NUM) {
if (ih == 0 || (ih & 0xff) >= I8259_INTR_NUM || ih == 2)
#define OPENPIC_INTR_NUM ((ICU_LEN)-(I8259_INTR_NUM))
offset += I8259_INTR_NUM;