ahc_inl
sgptr = ahc_inl(ahc, SCB_RESIDUAL_SGPTR);
data_cnt = ahc_inl(ahc, SCB_RESIDUAL_DATACNT);
data_addr = ahc_inl(ahc, SHADDR);
ahc_inl(struct ahc_softc *ahc, u_int port);
if (ahc_inl(ahc, SCB_BASE) != 0x5aa555aa)