APIC_INT_LINE_MASK
#define APIC_INT_LINE(x) (((x) & APIC_INT_LINE_MASK) >> APIC_INT_LINE_SHIFT)
irq = ihp->line & APIC_INT_LINE_MASK;
irq = ihp->line & APIC_INT_LINE_MASK;
line = ihp->line & APIC_INT_LINE_MASK;
int line = ih.line & APIC_INT_LINE_MASK;
int l = ih.line & APIC_INT_LINE_MASK;