MAT
#define RCAR_IRQ_SEND (MNR | MAL | MST | MAT | MDE)
#define RCAR_IRQ_RECV (MNR | MAL | MST | MAT | MDR)
if (msr & MAT)
irqs_to_clear |= MAT;
if (msr & MAT) {
irqs_to_clear |= MAT;