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Figure out how we support real realmode codegen #2

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opened 2025-05-06 18:16:12 +02:00 by mai-lapyst · 0 comments
mai-lapyst commented 2025-05-06 18:16:12 +02:00
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Currently the code generated by the rust target for the bootsector of bios boots is using size prefixed 32bit instructions to work in 16bit CPU mode. This should be changed.

For this there are two ideas:

  • Post processing the rust output (either by asking it to output asm and just rewriting that or by byte juggeling)
  • Changing LLVM to emit true 16bit code when asked nicely (or not-so-niecely)
Currently the code generated by the rust target for the bootsector of bios boots is using size prefixed 32bit instructions to work in 16bit CPU mode. This should be changed. For this there are two ideas: - Post processing the rust output (either by asking it to output asm and just rewriting that or by byte juggeling) - Changing LLVM to emit true 16bit code when asked nicely (or not-so-niecely)
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#1 Support bios that expect a BPB being present
chalk-os/rustboot
Reference: chalk-os/rustboot#2
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