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DragonFly kernel List (threaded) for 2004-08
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Re: PCI Express

From: Joerg Sonnenberger <joerg@xxxxxxxxxxxxxxxxx>
Date: Wed, 25 Aug 2004 16:43:32 +0200

On Wed, Aug 25, 2004 at 09:47:38AM -0400, David Rhodus wrote:
> PCI-E natively provides a legacy interrupt mode which in turn
> simulates PCI interrupt lines. This provides support for operating
> systems which do not yet have support for the enhanced space.  This
> also allows us to change drivers over in an incremental fashion
> because the drivers can choose whether to use MSI or the legacy
> interrupt mode.  I'm not currently very familiar with our PCI code. So
> I'm not aware of the resources required for supporting PCI-E and MSI. 
> Though most likely all of this code will need to be completely
> re-written.
> --
>                                             -David
>                                             Steven David Rhodus
>                                             <drhodus@xxxxxxxxxxx>

It would be implemented as a new bridge type with specific interface for
PCIe. The current interrupt model is limited and I'm working my way through
the code to develop something better.


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