This is hopefully the last time in a while that
something in the mm subsystem needs a refactor
this large. There are two main changes:
- The page frame allocator returns a vm_page_t
rather than a virtual address.
- Data for the slab allocator is now stored in
struct vm_page, which means there is no overhead
in the slab itself so the space is used in a
more efficient manner.
This has been brewing for quite some time now, and
it still is nowhere near finished, but at least it
compiles now. A lot has changed, and it's still
quite messy (i386 is almost certainly broken now,
i haven't even checked)
