DOS ain't dead

indirect far jmp - calling old INT problem (Developers)

posted by RayeR , CZ, 13.05.2012, 04:01
(edited by RayeR on 13.05.2012, 04:19)

> OK I'll rewrite it to call old ISR via INT.

I tried it in BOCHS and I have problem with calling old ISR via INT.
I got error messages when freedos boots and in bochs.log I can see:

00482449844i[BIOS ] int13_harddisk: function 00, unmapped device for ELDL=80
00482456146i[BIOS ] int13_harddisk: function 08, unmapped device for ELDL=80
00482460917i[BIOS ] int13_harddisk: function 00, unmapped device for ELDL=80
00482465680i[BIOS ] int13_harddisk: function 00, unmapped device for ELDL=81
00482470443i[BIOS ] int13_harddisk: function 00, unmapped device for ELDL=82
00482475206i[BIOS ] int13_harddisk: function 00, unmapped device for ELDL=83
...

I still can use "real" drive A: (I emulate B:) so it seems that old ISR is called but something got messed... I modified my code this way:

NEW_INT13H:                     ;INT XX do PUSH F, CLI, PUSH CS,IP (6B) / INT XX provadi PUSH F, CLI, PUSH CS,IP (6B)
        PUSHF                   ;store flags (2B) / uloz flagy (2B)
        CMP     DL,ROMDISK_DRIVE;related to our disk ? / tyka se to naseho disku?
        JE      @NEW_INT13H_HUB ;if yes continue below else / pokud ano, pokracuj nize, jinak
        POPF                    ;restore flags (2B) and / obnov flagy (2B) a

;JMP 0xF000:0xE3FE ; OK (hardcoded BOCHS ISR vector)

;        push ds ; OK (cm's example)
;        push ax
;        mov ax, 0
;        mov ds, ax
;        push bp
;        mov bp, sp
;        mov ax, [OLD_INT13H*4+2]
;        xchg ax, [bp+4]
;        push ax
;        mov ax, [OLD_INT13H*4]
;        xchg ax, [bp+2]
;        pop ds
;        pop bp
;        retf

        INT     85h             ;call old INT 13h handler / zavolej puvodni preruseni INT 13h
        IRET                    ;and return to caller program / a predej rizeni zpet volajicimu programu

@NEW_INT13H_HUB:                ;subfunction hub / rozcestnik podfunkci
...


If I call old ISR by direct far call or via cm's method (longer code than my old) it boots ok without error. What can be wrong?

---
DOS gives me freedom to unlimited HW access.

Complete thread:

• indirect far jmp in NASM - RayeR, 10.05.2012, 10:46 (Developers)
  • indirect far jmp in NASM - RayeR, 10.05.2012, 13:16
    • indirect far jmp - ecm, 10.05.2012, 13:26
    • indirect far jmp in NASM - Rugxulo, 10.05.2012, 13:26
      • indirect far jmp in NASM - RayeR, 10.05.2012, 14:07
        • indirect far jmp - ecm, 10.05.2012, 15:17
          • indirect far jmp - RayeR, 11.05.2012, 00:47
            • indirect far jmp - ecm, 11.05.2012, 12:46
            • indirect far jmp - bretjohn, 11.05.2012, 18:53
              • indirect far jmp - RayeR, 11.05.2012, 19:31
                • indirect far jmp - bretjohn, 11.05.2012, 22:31
                  • indirect far jmp - ecm, 11.05.2012, 22:33
                    • indirect far jmp - RayeR, 12.05.2012, 00:33
                      • indirect far jmp - Arjay, 12.05.2012, 01:07
                        • indirect far jmp - ecm, 12.05.2012, 01:27
                          • indirect far jmp - Arjay, 12.05.2012, 11:09
                            • indirect far jmp - ecm, 12.05.2012, 21:18
                        • indirect far jmp - RayeR, 12.05.2012, 21:17
                          • indirect far jmp/call - Chaining Interrupt Service Routines - Arjay, 13.05.2012, 13:16
                      • indirect far jmp - calling old INT problem - RayeR, 13.05.2012, 04:01
                        • indirect far jmp - calling old INT problem - ecm, 13.05.2012, 04:27
                          • indirect far jmp - calling old INT problem - RayeR, 13.05.2012, 15:33
                            • indirect far jmp - calling old INT problem - bretjohn, 13.05.2012, 17:05
                              • indirect far jmp - calling old INT problem - RayeR, 13.05.2012, 17:15
                                • indirect far jmp - calling old INT problem - RayeR, 13.05.2012, 19:19
                                  • indirect far jmp - calling old INT problem - Rugxulo, 13.05.2012, 20:02
                                    • indirect far jmp - calling old INT problem - RayeR, 13.05.2012, 20:49
                                    • indirect far jmp - calling old INT problem - ecm, 13.05.2012, 23:49
                                  • indirect far jmp - calling old INT problem - ecm, 13.05.2012, 23:40
                                    • indirect far jmp - calling old INT problem - ecm, 14.05.2012, 00:07
                                      • indirect far jmp - calling old INT problem - RayeR, 14.05.2012, 01:19
                            • indirect far jmp - calling old INT problem - ecm, 13.05.2012, 23:44
                              • indirect far jmp - calling old INT problem - bretjohn, 14.05.2012, 18:30
                                • redundant override in "ss:bp" for clarity - ecm, 14.05.2012, 18:47
                                • indirect far jmp - calling old INT problem - RayeR, 14.05.2012, 18:50
                                  • indirect far jmp - calling old INT problem - bretjohn, 14.05.2012, 20:16
                                    • indirect far jmp - calling old INT problem - ecm, 14.05.2012, 20:21
                                      • indirect far jmp - calling old INT problem - bretjohn, 14.05.2012, 21:42
                                        • indirect far jmp - calling old INT problem - bretjohn, 15.05.2012, 18:45
                                          • indirect far jmp - calling old INT problem - ecm, 15.05.2012, 18:53
                                            • indirect far jmp - calling old INT problem - bretjohn, 15.05.2012, 20:13
                                              • indirect far jmp - calling old INT problem - RayeR, 17.05.2012, 01:25