D_CHCR_TAG_SHIFT
(((x) >> D_CHCR_TAG_SHIFT) & D_CHCR_TAG_MASK)
((x) & ~(D_CHCR_TAG_MASK << D_CHCR_TAG_SHIFT))
((x) | (((val) << D_CHCR_TAG_SHIFT) & \
(D_CHCR_TAG_MASK << D_CHCR_TAG_SHIFT)))