vIER
gIER = vIER;
via1[vIER] = 0x7F;
(uint) via1[vPCR], (uint) via1[vIFR], (uint) via1[vIER]);
(uint) via2[vIFR], (uint) via2[vIER]);
events = via1[vIFR] & via1[vIER] & 0x7F;
via1[vIER] = IER_SET_BIT(irq_idx);
via1[vIER] = IER_CLR_BIT(irq_idx);