[PATCH] very rough cut at EXA support for trident blade (#3)

[Jesse Barnes]

Ok, here's #3.  Fixed a few small bugs since the last one and looked at 
doing efficient uploadtoscreen (ignore the stubbed out implementation 
in this patch, it definitely won't work).  Seems like the Cyberblade 
needs the CPU to load host->fb data through some registers, rather than 
providing a nice host->fb blt command directly; I'll have to try it to 
see if it's faster than the current direct fb memcpy that EXA does by 
default.  (For certain types of data it might be possible to use the 
texture upload unit present in this device, but I'm not sure yet.)

Review & comments appreciated.

Thanks,
Jesse
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