RADEON_OV0_VID_BUF0_BASE_ADRS
WRITE_IB_REG( RADEON_OV0_VID_BUF0_BASE_ADRS, offset);
OUTREG( ai->regs, RADEON_OV0_VID_BUF0_BASE_ADRS, offset);
OUTREG( regs, RADEON_OV0_VID_BUF0_BASE_ADRS, offset );
new_buf == 0 ? RADEON_OV0_VID_BUF0_BASE_ADRS : RADEON_OV0_VID_BUF3_BASE_ADRS,