In theory nothing
> 1. Are there tables that are created by the BIOS that we
> destroy during Linux runtime? mps tables spring to mind -
> I can't see where we preserve them ...
They should be in E820 reserved pages anyway and we do keep them and the
EBDA safe. You will however have blown away ACPI pages marked as disposable
> 2. Things that are reset by reboot that we don't reset during
> normal kernel boot?
Possibly. I wouldnt like to hand control back to the BIOS but the kernel
ought to be ok with itself.
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