If RAM + swap can be more than 4GB, how does FreeBSD address swap on a
32-bit machine?  Does the kernel internally use a wider address space
with some kind of translation to 32-bit space for programs and hardware
that can't handle 64-bit addresses or does it not map swap into the
address space at all, instead using it as a kind of "offline" storage
for pages not in use?  Does the Alpha port handle swap the same way?

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