> one potential issue: if system-accessible memory can exist in the
> upper phyical space (or, really, anything you might want to get at
> with libkvm), you might have issues.  libkvm seems to pervasively
> assume phys. addr == long.

Yes.
But since the intention of this patch is to support large device 
address space (there is no main memory beyond 4GB boundary), 
this issue can be postponed until 64-bit register or 64bit address 
space support.
--
soda