This is the final part of the major mm subsystem
refactor (for now). The new and improved slab
allocator can do *proper* poisoning, with pretty
accurate out-of-bounds and use-after-free
detection.
vm_page_t has also been restructured; its flags
and order are now combined into one atomic field.
As of now, everything except the code imported
from FreeBSD is proprietary. Of course, it won't
be like this for long, only until we have decided
which license we like to use. The rationale is
that releasing everything under a copyleft license
later is always easier than doing so immediately
and then changing it afterwards.
Naturally, any changes made before this commit are
still subject to the terms of the CNPL.
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)
That's it, nothing major is gonna happen anymore
until i get amd64 support working and deprecate
the entire i386 branch. 32-bit just adds so many
extra complications to memory management that i
don't want to waste any more energy on this
platform which is obsolete anyway.
This is a huge commit, but it mainly just moves
some files around and doesn't change their
contents much.
A lot of stuff works the same on amd64 as it does
on i386, so i'm moving the parts that are specific
to the latter into separate subdirectories while
the rest can be shared with the amd64 codebase.
This commit also fixes the fun little size bug in
segment.S where i subtracted the end from the
start address of the GDT instead of the other way
round which resulted in a gigantic overflow :)
