DMA_INTERRUPT_STATUS_REG
cobalt_read_bar0(cobalt, DMA_INTERRUPT_STATUS_REG) & 0xffff;
cobalt_write_bar0(cobalt, DMA_INTERRUPT_STATUS_REG, dma_interrupt);
dma_interrupt = cobalt_read_bar0(cobalt, DMA_INTERRUPT_STATUS_REG);
cobalt_write_bar0(cobalt, DMA_INTERRUPT_STATUS_REG,