DMA_KERNADDR
return DMA_KERNADDR(&st->st_data);
addr == DMA_KERNADDR(&ad->ad_playback->st_data))
addr == DMA_KERNADDR(&ad->ad_capture->st_data))
bdl = DMA_KERNADDR(&st->st_bdl);
uint32_t *corb = DMA_KERNADDR(&sc->sc_corb);
uint64_t *rirb = DMA_KERNADDR(&sc->sc_rirb);