DOS ain't dead - non-DOS (yet): an interesting project for x86-64

non-DOS (yet): an interesting project for x86-64 (Miscellaneous)

posted by Japheth , Germany (South), 23.01.2021, 08:52

> I was also under the impression that once you enter long mode, there’s no
> way to fault back into any other mode.

It's clearly documented how to switch between modes. To switch from long mode to real-mode is no problem at all. The only switches that aren't (directly) possible is from legacy 32-bit paging to PAE-paging and vice versa - because that requires to set both cpu registers CR3 and CR4 simultaneously.

---
MS-DOS forever!

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Complete thread:

non-DOS (yet): an interesting project for x86-64 - effebi68, 18.01.2021, 08:57 (Miscellaneous)
- non-DOS (yet): an interesting project for x86-64 - glennmcc, 19.01.2021, 17:52
  - non-DOS (yet): an interesting project for x86-64 - effebi68, 19.01.2021, 18:35
  - non-DOS (yet): an interesting project for x86-64 - ecm, 19.01.2021, 18:57
    - non-DOS (yet): an interesting project for x86-64 - RayeR, 19.01.2021, 19:14
      - non-DOS (yet): an interesting project for x86-64 - ecm, 19.01.2021, 20:01
    - non-DOS (yet): an interesting project for x86-64 - glennmcc, 20.01.2021, 07:16
      - non-DOS (yet): an interesting project for x86-64 - tkchia, 21.01.2021, 17:42
        non-DOS (yet): an interesting project for x86-64 - ecm, 21.01.2021, 18:24
        non-DOS (yet): an interesting project for x86-64 - tkchia, 21.01.2021, 18:40
        non-DOS (yet): an interesting project for x86-64 - RayeR, 21.01.2021, 18:57
        non-DOS (yet): an interesting project for x86-64 - Oso2k, 23.01.2021, 05:26
        non-DOS (yet): an interesting project for x86-64 - Zyzzle, 23.01.2021, 07:03
        non-DOS (yet): an interesting project for x86-64 - tkchia, 23.01.2021, 15:13
        non-DOS (yet): an interesting project for x86-64 - RayeR, 23.01.2021, 20:35
        non-DOS (yet): an interesting project for x86-64 - tkchia, 24.01.2021, 04:20
        non-DOS (yet): an interesting project for x86-64 - RayeR, 25.01.2021, 17:34
        non-DOS (yet): an interesting project for x86-64 - Japheth, 23.01.2021, 08:52
        non-DOS (yet): an interesting project for x86-64 - glennmcc, 23.01.2021, 17:38
        non-DOS (yet): an interesting project for x86-64 - tkchia, 23.01.2021, 18:31
        non-DOS (yet): an interesting project for x86-64 - glennmcc, 23.01.2021, 21:07
        non-DOS (yet): an interesting project for x86-64 - tom, 23.01.2021, 23:31
        non-DOS (yet): an interesting project for x86-64 - glennmcc, 24.01.2021, 02:56
        non-DOS (yet): an interesting project for x86-64 - tkchia, 24.01.2021, 04:34
        non-DOS (yet): an interesting project for x86-64 - glennmcc, 24.01.2021, 05:17
        non-DOS (yet): an interesting project for x86-64 - tkchia, 24.01.2021, 06:26
        non-DOS (yet): an interesting project for x86-64 - glennmcc, 25.01.2021, 03:30
        non-DOS (yet): an interesting project for x86-64 - rr, 25.01.2021, 13:05
        non-DOS (yet): an interesting project for x86-64 - glennmcc, 27.01.2021, 04:03
        non-DOS (yet): an interesting project for x86-64 - tkchia, 27.01.2021, 07:04
        non-DOS (yet): an interesting project for x86-64 - RayeR, 25.01.2021, 17:51
        non-DOS (yet): an interesting project for x86-64 - tkchia, 24.01.2021, 03:59
        non-DOS (yet): an interesting project for x86-64 - tkchia, 20.07.2021, 10:29
- non-DOS (yet): an interesting project for x86-64 - tkchia, 15.11.2022, 08:44