DMATAG_CMD_PCE_MASK
(((x) >> DMATAG_CMD_PCE_SHIFT) & DMATAG_CMD_PCE_MASK)
((x) & ~(DMATAG_CMD_PCE_MASK << DMATAG_CMD_PCE_SHIFT))
(DMATAG_CMD_PCE_MASK << DMATAG_CMD_PCE_SHIFT)))