DOS ain't dead

Code at 0x9F00 segment after boot (Miscellaneous)

posted by CandyMan, 04.11.2020, 17:50

Strange code at 0x9F00:0x000 (equal to 4KB) after boot (AMI UEFI DUAL BIOS).
It includes MONITOR and MWAIT instructions, among others, and jumps to protected mode.
What could it be?
Is there any option in UEFI to get rid of it?

Complete thread:

• Code at 0x9F00 segment after boot - CandyMan, 04.11.2020, 17:50 (Miscellaneous)
  • Code at 0x9F00 segment after boot - Laaca, 04.11.2020, 21:00
    • Code at 0x9F00 segment after boot - CandyMan, 05.11.2020, 12:35
      • Code at 0x9F00 segment after boot - RayeR, 06.11.2020, 13:27
        • Code at 0x9F00 segment after boot - tkchia, 08.11.2020, 07:45
          • Code at 0x9F00 segment after boot - RayeR, 08.11.2020, 16:07
            • Code at 0x9F00 segment after boot - Zyzzle, 09.11.2020, 06:46
              • Code at 0x9F00 segment after boot - tkchia, 09.11.2020, 17:23
                • Code at 0x9F00 segment after boot - RayeR, 10.11.2020, 03:52
          • Code at 0x9F00 segment after boot - CandyMan, 08.11.2020, 20:50
            • Code at 0x9F00 segment after boot - tkchia, 09.11.2020, 17:03
        • Code at 0x9F00 segment after boot - CandyMan, 08.11.2020, 20:45
          • Code at 0x9F00 segment after boot - bretjohn, 09.11.2020, 00:26