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Memory mapped devices from resl mode (Developers)

posted by Khusraw , Bucharest, Romania, 04.03.2020, 15:02
(edited by Khusraw on 04.03.2020, 15:15)

> Or maybe other possibility could be the DPMI assistance.
> I can imagine this scenario:
>
> 1) Resident DPMI server
> 2) Hooked interrupt (or callback) processed in the protected mode
> 3) Realmode soundriver calls interrupt (or callback) which will be routed
> to resident DPMI routine
>
> This mechanism should certainly work for new programs which will be aware
> of this situation.
>
> But it is uncertain about old already compiled games.
> I am not sure about possibility of persistent DPMI hook of
> interrupt/callback

Why would you want to complicate the things and try do that is something that I can't understand. If your program is a DPMI program, then use DPMI to access that memory, if your program is intended to run in real mode/V86 mode, then use INT 15h/87h. If you have a program which uses DPMI-based sound card drivers, then write a DPMI-based driver for it, if you have a program which uses real mode sound card drivers, then write a real mode driver for it and access the HDA's memory registers with INT 15h/87h, it works very well. Your problem is that you don't know how to use an already existing driver, or that you have no driver and want to write one? BTW, if I want to use the same driver with both real mode and DPMI programs, I would rather write a real mode one.

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Glory to God for all things

Complete thread:

• Memory mapped devices from resl mode - Laaca, 26.02.2020, 12:11 (Developers)
  • Memory mapped devices from resl mode - Khusraw, 26.02.2020, 12:35
  • Memory mapped devices from resl mode - RayeR, 27.02.2020, 05:27
    • Memory mapped devices from resl mode - Khusraw, 27.02.2020, 09:07
      • Memory mapped devices from resl mode - Laaca, 04.03.2020, 14:01
        • Memory mapped devices from resl mode - Khusraw, 04.03.2020, 15:02
          • Memory mapped devices from resl mode - Laaca, 04.03.2020, 15:08
            • Memory mapped devices from resl mode - Khusraw, 04.03.2020, 15:23
            • Memory mapped devices from resl mode - Khusraw, 04.03.2020, 15:36
            • Memory mapped devices from resl mode - Khusraw, 04.03.2020, 16:55
              • Memory mapped devices from resl mode - Laaca, 04.03.2020, 18:54
                • Memory mapped devices from resl mode - Khusraw, 04.03.2020, 19:33
    • Memory mapped devices from resl mode - Laaca, 27.02.2020, 17:50
      • Memory mapped devices from resl mode - Khusraw, 27.02.2020, 20:25
        • Memory mapped devices from resl mode - KormaX, 01.03.2020, 22:23
          • Memory mapped devices from resl mode - Zyzzle, 02.03.2020, 06:10
            • Memory mapped devices from resl mode - KormaX, 12.05.2020, 11:21
        • Memory mapped devices from resl mode - marcov, 02.03.2020, 15:43
          • Memory mapped devices from resl mode - Khusraw, 02.03.2020, 19:39
            • Memory mapped devices from resl mode - marcov, 02.03.2020, 23:13
              • Memory mapped devices from real mode - Rugxulo, 03.03.2020, 06:11
                • Memory mapped devices from real mode - marcov, 03.03.2020, 10:12
                  • Memory mapped devices from real mode - Rugxulo, 03.03.2020, 22:12
              • Memory mapped devices from resl mode - Khusraw, 03.03.2020, 13:34