Messages in this thread | | | Date | Mon, 09 Sep 2002 11:17:07 -0700 (PDT) | Subject | Re: Calculating kernel logical address .. | From | "David S. Miller" <> |
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From: "Richard B. Johnson" <root@chaos.analogic.com> Date: Mon, 9 Sep 2002 14:00:35 -0400 (EDT)
Well I just read Documentation/DMA-mapping.txt as advised by David and it seems as though it will no longer be possible to do what many programmers have been wanting to do, to wit:
(1) In user-code, allocate a buffer. (2) Lock that buffer into memory. (3) Call some driver that DMAs data to/from that buffer.
Video capture drivers and ALSA layer in 2.5.x kernel do this perfectly fine. Perhaps you should have a look at how they handle DMA on PCI. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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