TX_AVAILABLE
outw(ACK_INTR | INT_LATCH | TX_AVAILABLE | RX_EARLY | INT_REQ,
outw((SET_INTR_ENB | INT_LATCH | TX_AVAILABLE | TX_COMPLETE |
if (status & TX_AVAILABLE) {
outw(ACK_INTR | TX_AVAILABLE, ioaddr + EL3_CMD);