on 30/07/2010 00:41 Alexander Fiveg said the following: > Thanks a lot for your answers. But i am afraid i do not have enough > experience to solve these tasks. Could you please provide me with helpful > information how to: > - get access to the pages associated with a certain memory-buffer ? > I mean, I want to get the structures, that describe the page properties I > should change (for instance, in order to make the page non-cacheable). > > if you are aware of any good papers or examples in the system code, where > these topics are covered, I would appreciate it if you gave me the > references.
I don't have a recipe, but some pointers to get you started: 1. investigate BUS_DMA_NOCACHE, see bus_dma(9) 2. check sys/dev/sound/pci/hda/hdac.c for HDAC_F_DMA_NOCACHE and comment about PCIe snoop - this might be relevenat 3. see pmap_change_attr for way to change caching type for a memory mapping 4. hope that more knowledgeable people (experts) provide their advice, keep nudging them via mailing list(s) :-) -- Andriy Gapon _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscr...@freebsd.org"
