[haiku-development] Re: 64 bit physical addresses
- From: Ingo Weinhold <ingo_weinhold@xxxxxx>
- To: haiku-development@xxxxxxxxxxxxx
- Date: Tue, 22 Jun 2010 22:29:08 +0200
On 2010-06-22 at 19:02:05 [+0200], Philippe Houdoin
<philippe.houdoin@xxxxxxxxx> wrote:
> Ingo asked:
> > I wasn't quite sure what to do what to do with several drivers for USB
> > devices (usb_serial, usb_audio, etc.). They allocate memory with
> > B_CONTIGUOUS -- usually a sign for memory for DMA -- but the physical
> > addresses are never retrieved as far as I have seen. I might have
> > overlooked something, though.
>
> AFAIK, the physical addresses are retrieved by the USB bus module who
> handle the USB transfert request.
If that is the case, it escaped me where. Recursively grepping for
get_memory_map through src/add-ons/kernel turns up only two hits in USB
related code. Each in the bus manager after a respective create_area().
> I guess USB stack and busses modules will need to be made 64bit
> compliant to support such drivers...
Yep.
CU, Ingo
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