DOS ain't dead - With DPMI into protect mode and back

With DPMI into protect mode and back | physical memory (Developers)

posted by ecm , Düsseldorf, Germany, 07.09.2010, 17:04

> > Using RM callbacks (which I did use too, but that's not
> > the point) doesn't properly remove the "DPMI process"
> > or "context", so you're not really back.
>
> There is so-called "raw" switch...

What's it do with the "DPMI process" or "context"? Nothing. And that's not better than the callback method, that's worse, because I want those to be properly removed.

> Right, but it may be useful to execute external dangerous code in a
> separate process on any OS.

True.

> > and going into PM on your own works with an EMM, XMM or DPMI host
> installed.
>
> ~~Right~~Wrong, it neither works with any EMM nor with some XMMs and DPMI hosts.

Yeah, that's what I meant.

> BTW, how do you ~~hog~~allocate or map physical memory in DPMI???

Maybe Int31.0508 (DPMI 1.0)? Otherwise, Int31.08 (DPMI 0.9+). As I understand it, you have to allocate an XMS memory block first and lock that, then access it with the linear address Int31.0800 returns.

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l

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Complete thread:

With DPMI into protect mode and back - Laaca, 13.08.2010, 10:36
- With DPMI into protect mode and back - EDIT: example - ecm, 13.08.2010, 14:30
  - With DPMI into protect mode and back - EDIT: example - DOS386, 26.08.2010, 09:18
    - With DPMI into protect mode and back - EDIT: example - ecm, 26.08.2010, 14:35
      - With DPMI into protect mode and back - EDIT: example - DOS386, 27.08.2010, 03:33
        With DPMI into protect mode and back - EDIT: example - ecm, 30.08.2010, 21:51
        With DPMI into protect mode and back | physical memory - DOS386, 06.09.2010, 20:08
        With DPMI into protect mode and back | physical memory - ecm, 07.09.2010, 17:04
        With DPMI into protect mode and back | physical memory - DOS386, 08.09.2010, 00:51
        With DPMI into protect mode and back | physical memory - ecm, 08.09.2010, 20:53
        With DPMI into protect mode and back | physical memory - DOS386, 11.09.2010, 01:02
        With DPMI into protect mode and back | physical memory - ecm, 11.09.2010, 01:25
- With DPMI into protect mode and back - Japheth, 18.08.2010, 08:04
  - With DPMI into protect mode and back - Japheth, 18.10.2010, 11:17
    - With DPMI into protect mode and back - Rugxulo, 18.10.2010, 23:07
      - With DPMI into protect mode and back - Japheth, 19.10.2010, 09:58
        With DPMI into protect mode and back - Rugxulo, 19.10.2010, 10:09
        With DPMI into protect mode and back - Japheth, 19.10.2010, 10:20
        Possible CWSDPMI design flaw - Japheth, 19.10.2010, 17:59