HME_XD_SIZE
p += ntbuf * HME_XD_SIZE;
dma += ntbuf * HME_XD_SIZE;
p += nrbuf * HME_XD_SIZE;
dma += nrbuf * HME_XD_SIZE;
#define HME_XD_FLAGS(b, i) ((char *)(b) + ((i) * HME_XD_SIZE) + 0)
#define HME_XD_ADDR(b, i) ((char *)(b) + ((i) * HME_XD_SIZE) + 4)