On Monday 29 June 2009 14:10:11 Stanislav Sedov wrote: > On Mon, 29 Jun 2009 13:37:41 +0200 > > Hans Petter Selasky <[email protected]> mentioned: > > USB is currently _updating_ (!!) the PAGE offset part of "vaddr". If > > cpu_dcache_inv_range() is called with an address not starting at the > > cache line what will the cpu_dcache_inv_range() do? Will it skip to the > > next cache line? Or will it completely skip the whole cache sync > > operation?! > > Currently, the address passed to cpu_dcache_inv_range will be rounded up > to the cache line boundary and the whole line will be invalidated if the > range requested is smaller than 16KiB. Otherwise, the whole cache will > be invalidated.
That maybe explains it, because USB will require rounding down the address and rounding up the length accordingly, because it uses the "BUS_DMA_KEEP_PG_OFFSET" flag. --HPS _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-usb To unsubscribe, send any mail to "[email protected]"
