RADEON_GEN_INT_STATUS
OUTREG( ai->regs, RADEON_GEN_INT_STATUS, int_cntl );
OUTREG( di->regs, RADEON_GEN_INT_STATUS, RADEON_VIDDMA_AK );
full_int_status = INREG(regs, RADEON_GEN_INT_STATUS);
OUTREG(regs, RADEON_GEN_INT_STATUS, int_status);