On Wed, 17 Dec 1997 14:32:10 +0100 
 Leo Weppelman <leo@wau.mis.ah.nl> wrote:

 > Yesterday, I was looking at a contributed driver that contained a line
 > like:
 > 
 >      uiomove((caddr_t)(sc->sc_memt + sc->sc_memh + uio->uio_offset),
 >              length, uio);
 > 
 > obviously, this is not correct. However, what *is* the correct solution
 > here? Should there always be an intermediate copy to a buffer like:
 >      bus_space_read_multi_1(sc->sc_memt, sc->sc_memh, uio->uio_offset,
 >                             buf, length);
 >      uiomove(buf, length, uio);
 > 
 > This is not very efficient.  Am I missing something obvious?

What is the driver?  In any case, with shared memory devices like this,
you really don't have much of a choice.

Jason R. Thorpe                                       thorpej@nas.nasa.gov
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