I don't think you should fall back into real mode. There's no good reason to. I think you should look at how LOBOS does its thing, which is to boot linux entirely in protected mode, and emulate that in your bios.
Falling into real mode is a mess. Also, once you drop to real mode, you can't address 0x100000 any more. This is probably not what you want, since your code is at 0x101000.
ron
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