DOS ain't dead

Memory mapped devices from resl mode (Developers)

posted by Khusraw , Bucharest, Romania, 04.03.2020, 15:36
(edited by Khusraw on 04.03.2020, 16:02)

To be more specific, in case of a HDA sound card, the only sound cards I have experience with that use MMIO, you have to find the device and get its memory base address by using INT 1Ah to call the PCI BIOS (see http://www.ctyme.com/intr/int-1A.htm), and then read and write the memory registers according to what you want to do, nothing more. For reading from/writing to the card's memory register to/from a memory address directly accesible to your program, you only need to set the correct values in the GDT that you pass to INT 15h/87h (see http://www.ctyme.com/intr/rb-1527.htm).

---
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