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TODO revision 1.1.1.2 
      1 To do list (not in any particular order).
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      3     o	Improve pmap_zero_page and pmap_copy_page. Speed and flushing.
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      5     o	Move the RO and WIRED attribute from the pte to the pv table.
      6 	This saves four instructions in the tlb miss handler.
      7 InWork: Have a test version. The system hangs after a while. Not solved yet.
      8         Also, is it worth the effort to remove 4 instr. in TLB-miss handler?
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     10     o   Boot. Standalone boot program instead of booting the kernel directly?
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     12     o   sigsetjmp/siglongjmp missing....
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     14     o   Add more videomodes to pccons driver. 50kHz and 64kHz monitors?
     15 InWork: This seems to be hard. Need more info on the chip.
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     17     o   Find out why bitmap load to S3-928 flashes screen.
     18 Know why (enable linear mode). Need S3 info.
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     20     o   Can we have 32 double registers?
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     23 Lots of other things.....
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