GetFrDs
unsigned int to_fr_ds = (GetToDs(pframe) << 1) | GetFrDs(pframe);
unsigned int to_fr_ds = (GetToDs(pframe) << 1) | GetFrDs(pframe);
unsigned int to_fr_ds = (GetToDs(pframe) << 1) | GetFrDs(pframe);
#define get_tofr_ds(pframe) ((GetToDs(pframe) << 1) | GetFrDs(pframe))