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- boot time memory allocation has changed. the fractal page map has been
replaced by a single self-mapped page giving 2MiB of ready virtual
space to play with without needing a fully-initialized memory manager. this
scheme may be repeated for other purposes
- the page stack has now been totally overhauled to make use of sparse
allocation and all of the ugly init_*() procedures are gone. long live
the new interface. also reference counting is a thing now. sort of.
- found a bug in vmt_init_node where insertion did not use the root node as
the parent in the case of no predecessor node. whoops.
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