> --- Ursprüngliche Nachricht --- > Von: Dan Malek <[EMAIL PROTECTED]> > An: "Gerhard Pircher" <[EMAIL PROTECTED]> > Kopie: [email protected], [EMAIL PROTECTED], Benjamin > Herrenschmidt <[EMAIL PROTECTED]> > Betreff: Re: Unmapping pages from the linear addressing without > HIGHMEM support > Datum: Fri, 10 Mar 2006 07:59:33 -0500 > > On Mar 10, 2006, at 4:09 AM, Gerhard Pircher wrote: > > > That would mean I cannot reuse the code in dma-mapping.c, right? > > Sure you can. All you need to do is turn of BAT mapping, which > is as easy as using the 'nobats' command line parameter and > all of this code should just work for you. Yes, that was the solution I would have used. The other solution is to reserve a physical memory area for DMA operations that is not mapped by the BATs (AFAIU nor by any page tables setup by the kernel). Therefore I doubt that I can simply reuse the dma-mapping.c code for the latter approach!? Do I mix something up here?
> > ... but I guess I have to setup my own page table for the reserved > > DMA memory area and implement my own alloc_pages() function!? > > No, that's already done for you behind all of these functions. But only, if the whole BAT mapping is killed, right? Thanks! Gerhard -- "Feel free" mit GMX FreeMail! Monat für Monat 10 FreeSMS inklusive! http://www.gmx.net -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
