Linked by Thom Holwerda on Wed 5th Jan 2011 22:09 UTC
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Maybe you could, but once you get enough 64-bit support in the kernel to be able to run 64-bit processes, it's just weird to keep the rest of the kernel 32-bit.
Moreover, drivers and kernel could only write in the first 4GB of RAM without being PAE-aware, which could be problematic for things like DMA.




Member since:
2008-01-09
64 bit kernel is not necessary, see OS X. X86-64 CPU's can switch between two modes of operations at run-time allowing 64 bits processes as well as a 32 bit kernel and drivers.