hpc1_hdd_bufptr
hva->hpc1_hdd_bufptr = segp->ds_addr;
hva->hpc1_hdd_bufptr |= HPC1_HDD_CTL_EOCHAIN;
sc->sc_txdesc[nexttx].hpc1_hdd_bufptr =
sc->sc_txdesc[seg].hpc1_hdd_bufptr);
sc->sc_txdesc[lasttx].hpc1_hdd_bufptr |=
__rxd->hpc1_hdd_bufptr =