mpr_add_dmaseg
error = mpr_add_dmaseg(cm, segs[i].ds_addr, segs[i].ds_len,
mpr_add_dmaseg(cm, 0, 0, 0, 1);
int mpr_add_dmaseg(struct mpr_command *, vm_paddr_t, size_t, u_int, int);