NEC86_INTRBLK_UNIT
u_int base = NEC86_INTRBLK_UNIT;
if (blk < NEC86_INTRBLK_UNIT * 2)
return NEC86_INTRBLK_UNIT * 2;
watermark = (hw_blocksize / sc->pdma_nchunk) + (NEC86_INTRBLK_UNIT - 1);
wm = (wm / NEC86_INTRBLK_UNIT) * NEC86_INTRBLK_UNIT;
if (wm < NEC86_INTRBLK_UNIT)
wm = NEC86_INTRBLK_UNIT;
if ((wm < NEC86_INTRBLK_UNIT) || (wm > NEC86_BUFFSIZE)
|| ((wm % NEC86_INTRBLK_UNIT) != 0))
(wm / NEC86_INTRBLK_UNIT) - 1);