SIIS_SG_ENTRIES
KASSERT(nsegs <= SIIS_SG_ENTRIES, ("too many DMA segment entries\n"));
SIIS_SG_ENTRIES * PAGE_SIZE, SIIS_SG_ENTRIES, 0xFFFFFFFF,
#define SIIS_PRB_SIZE (32 + 16 + SIIS_SG_ENTRIES * 16)