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===============================================
BUGS / THINGS TO FIX (incomplete list)
===============================================
MMU zero-pages
==============
If a previously unreferenced page is accessed, a mapping to
the zero-page is inserted in the hash table. The mapping is
not updated if a write occur from one of the other two
MMU-modes.
MMU-BAT (FIXED)
=======
The PTEs in the hash-table used to emulate a BAT-register
remain even after the BAT-register has been altered.
604/603 separate BATs
=====================
IBATs/DBATs are not entirely treated as split bats
(due to implementation reasons). This should not
be a problem.
Processor "emulation":
======================
- DEC register DONE
- HIDx registers
- Floating point operations DONE
- DBATs (for 603/604) DONE
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