Enhance shadow support: Write-enable c, d, e segments; write protect
option roms before boot.
-Replace hand-rolled memory allocation code with new malloc_fseg() and
-malloc_high() functions.
-
-Refactor acpi rsdt table creation code - allow each sub-table to be
-added dynamically.
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-Deploy smbios in high memory.
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Unify floppy functions and main disk functions?
Add int 0x1589 support.