Ian Romanick wrote:
So, I was thinking about some CPUs that are about to hit the market and how they will interact with DRI. The main issue that I came across was with x86-64. When x86-64 systems roll of the line, they'll (eventually?) have 64-bit kernel support and (for legacy apps) 32-bit user-mode support.Keep in mind that the TDFX driver was ported to IA-64 many moons ago. I know Don Dugger had 32 bit applications (running in a 32 bit subsystem, w/ a 32 bit client side driver) direct rendering to the tdfx display controlled by a 64 bit server running on a 64 bit kernel.
My question is, what are the gottchas of having the DRM run in a 64-bit kernel and the rest of the driver run in either a 32-bit application or a 64-bit application? Will it even matter? If it will matter, is there anything we can start doing now to soften the blow?
Linus, do you have any thoughts on this issue?
If I recall there was some kind of 32bit to 64bit thunking layer for kernel calls.
TDFX didn't required any AGP support, so there's work to be done there.
This was all done open source, so that work should be around somewhere.
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