SDMA_INT_PEND
sdma_write(b, SDMA_INT_PEND, SDMA_INT_IMPL);
return sdma_read(&bestcomm_sc->sc_pic, SDMA_INT_PEND);
pending = sdma_read(b, SDMA_INT_PEND) & ~b->int_mask &
sdma_write(b, SDMA_INT_PEND, SDMA_INT_TASK(irq));