OPENPIC_DSRC_VECTOR_OFFSET
OPENPIC_DSRC_VECTOR_OFFSET(irq), OPENPIC_IMASK);
distopic_write(opic, isu, OPENPIC_DSRC_VECTOR_OFFSET(realirq), x);
x = distopic_read(opic, isu, OPENPIC_DSRC_VECTOR_OFFSET(realirq));
distopic_write(opic, isu, OPENPIC_DSRC_VECTOR_OFFSET(realirq), x);
x = distopic_read(opic, isu, OPENPIC_DSRC_VECTOR_OFFSET(realirq));
distopic_write(opic, isu, OPENPIC_DSRC_VECTOR_OFFSET(realirq), x);