dma_cache_maintenance
dma_cache_maintenance( virt_to_phys(addr), 512, 0 );
dma_cache_maintenance( PhysTrackBuffer, MaxSectors[DriveType] * 512, 0 );
dma_cache_maintenance( paddr, BUFFER_SIZE, 1 );
dma_cache_maintenance( paddr, 512, 1 );
dma_cache_maintenance(addr, count, dir);