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The linux boot code compiles into 32-bit, i386+ code using the unmodified i386 back end. That it runs in a code segment where the default data and address sizes are 16 bits just means that it needs a lot of 0x66 and 0x67 prefixes, but that's handled entirely by GAS. If you want to help the linux people here, implement an option to reliably output a ".code16gcc" directive at the beginning of the asm file.
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