BGE_JLEN
ptr += BGE_JLEN;
int i = ((char *)buf - (char *)sc->bge_cdata.bge_jumbo_buf) / BGE_JLEN;
BGE_JLEN, BUS_DMASYNC_PREREAD);
BGE_JLEN, BUS_DMASYNC_POSTREAD);
#define BGE_RESID (BGE_JPAGESZ - (BGE_JLEN * BGE_JSLOTS) % BGE_JPAGESZ)
#define BGE_JMEM ((BGE_JLEN * BGE_JSLOTS) + BGE_RESID)