On Mon, Jan 27, 2003 at 02:40:00AM +0100, Bernhard Kaindl wrote:
> > TDFX didn't required any AGP support, so there's work to be done there.
> Seems so, the x86_64 developers should be able to give some more info,
> e.g. I've read in arch/x86_64/kernel/pci-gart.c that the AMD Hammer has
> an IOMMU in the northbridge and it says that it can support PCI devices
> which can only support 32bit addresses on systems >4GB using the IOMMU.
It's actually something of a hack. It uses the agpgart as a
psuedo-IOMMU. It does this by allocating a percentage of the GART tables
for IOMMU usage, and reducing the size the agpgart code sees.
> PS: I don't know much about AGP, DRI and the internals of AMD Hammer
> Systems, so please forgive me if I overlooked something obvious.
Your comments make sense, and pretty much sum things up.
The ioctl stuff for eg.. the agp/dri ones are not yet added afaik
in the 32bit compatability code. (arch/x86_64/ia32/ia32_ioctl.c)
I've not looked at testing 64bit kernel + 32bit userspace yet,
so far just bringing up 64+64 / 32+32 has been enough work.
Dave
--
| Dave Jones. http://www.codemonkey.org.uk
| SuSE Labs
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