From: Steffen Seeger <seeger@physik.tu-chemnitz.de>
  To  : ggi-develop@eskimo.com
  Date: Tue, 21 Jul 1998 11:48:17 +0200 (MEST)

Re: DMA BLTs

> Brian writes:
> 
> >  2) What's the procedure for translating a processes's userspace address
> >  into physical address so it can be decided whether bounce buffers
> >  are needed?
> 
> I just read this on linux-kernel, hope it helps:
> 
> :  I agree with what Alan says in another message, a driver that kmallocs
> :  and maps the memory to user space is a lot saner, not least because the
> :  driver has proper control over the type of memory (GFP_DMA if needed,
> :  for example, and none of the complications of normal user pages).
> :  
> :  People may peek at the sound code for an example of mmaping pages used
> :  for DMA.

That's what the /dev/graphic driver does. (Hey, I did it the sane way! ;-)

>   Andrew Apted   <andrew@ggi-project.org>       \/

			Steffen

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