DOS ain't dead

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

posted by ecm  , Düsseldorf, Germany, 08.09.2010, 20:53

> This might work under some special optimal circumstances... but what do
> you do if there is no XMS host? BTW, I had very deliberately asked about
> physical memory hoggingallocation and not mapping, because there is
> a critical design fault (one of many) in DPMI: no "official" way to
> hogallocate physical memory.

There might not be specific DPMI functions for this, but your "special" optimal circumstances (an XMM) are the default on most DOS systems. Otherwise, abort the operation/process requiring physical memory and inform the user that he needs to configure his set-up to include an XMM. (Sometimes using memory handled by DOS can solve this, as this should be mapped exactly to physical memory if there is no XMM/EMM.) Not nice, but it's nothing critical.

Japheth might know this better.


You didn't even mention that physical memory can't be allocated in NTVDM! Oh no!

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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