DMAI_FLAGS_MAPPED
mp->dmai_flags |= (DMAI_FLAGS_INUSE | DMAI_FLAGS_MAPPED);
mp->dmai_flags |= DMAI_FLAGS_MAPPED;
mp->dmai_flags &= ~DMAI_FLAGS_MAPPED;
mp->dmai_flags |= DMAI_FLAGS_MAPPED;
#define PCI_DMA_ISMAPPED(mp) ((mp)->dmai_flags & DMAI_FLAGS_MAPPED)