QM_REG_ISR
qm_out(&affine_portals[i]->p, QM_REG_ISR, 0xffffffff);
u32 is = qm_in(&p->p, QM_REG_ISR) & p->irq_sources;
qm_out(&p->p, QM_REG_ISR, clear);
qm_out(p, QM_REG_ISR, 0xffffffff);
qm_out(&p->p, QM_REG_ISR, ~ier);