topbit
uint32_t topbit = BITMASK(p_cm->cm_width-1);
if (p_cm->cm_reg & topbit)
uint32_t topbit = BITMASK(p_cm->cm_width-1);
if (r & topbit)
csid->csi_hibit = topbit(csz) - 1;
uint32_t topbit = BITMASK(p_cm->cm_width-1);
if (p_cm->cm_reg & topbit)
uint32_t topbit = BITMASK(p_cm->cm_width-1);
if (r & topbit)