HC_IC
ATA_OUTL(ctlr->r_mem, HC_BASE(i) + HC_IC, 0x00000000);
ATA_OUTL(ctlr->r_mem, HC_BASE(p == 4) + HC_IC, ~aic);
ATA_OUTL(ctlr->r_mem, HC_IC, 0x00000000);
ATA_OUTL(ctlr->r_mem, HC_IC, ~aic);