Changeset 555 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h.asm


Ignore:
Timestamp:
Jun 15, 2013, 1:39:33 PM (11 years ago)
Author:
aitotat@…
google:author:
aitotat@gmail.com
Message:

Changes to XTIDE Universal BIOS:

  • Short timeouts for drive detection work again.
  • All drives are now reset before booting (instead of XTIDE Universal BIOS controlled drives only).
  • Windows 98 now works without tricks (Floppy Drive accesses are redirected from INT 13h to 40h).
File:
1 edited

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  • trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h.asm

    r542 r555  
    7979
    8080;--------------------------------------------------------------------
    81 ; Int 13h software interrupt handler.
    82 ; Jumps to specific function defined in AH.
    83 ;
    84 ; Note to developers: Do not make recursive INT 13h calls!
    85 ;
    86 ; Int13h_DiskFunctionsHandler
     81; Int 13h (Hard Drive) to Int 40h (Floppy Drive)
     82; We must not call previous INT 13h for floppy drives since it
     83; does not work on Windows 98 (when using HSFLOP.PDR driver) for some reason.
     84;
     85; DirectCallToFloppyHandler40h
    8786;   Parameters:
    8887;       AH:     Bios function
    … …  
    9291;       Depends on function
    9392;--------------------------------------------------------------------
     93DirectCallToFloppyHandler40h:
     94; With serial floppy support, we handle all traffic for function 08h,
     95; as we need to wrap both hard disk and floppy drive counts.
     96%ifdef MODULE_SERIAL_FLOPPY
     97    cmp     ah, GET_DRIVE_PARAMETERS    ; 08h
     98    je      SHORT WeHandleTheFloppyFunction
     99%endif
     100
     101    int     BIOS_DISKETTE_INTERRUPT_40h
     102    retf    2           ; Skip FLAGS from stack
     103
     104
     105;--------------------------------------------------------------------
     106; Int 13h software interrupt handler.
     107; Jumps to specific function defined in AH.
     108;
     109; Note to developers: Do not make recursive INT 13h calls!
     110;
     111; Int13h_DiskFunctionsHandler
     112;   Parameters:
     113;       AH:     Bios function
     114;       DL:     Drive number
     115;       Other:  Depends on function
     116;   Returns:
     117;       Depends on function
     118;--------------------------------------------------------------------
    94119ALIGN JUMP_ALIGN
    95120Int13h_DiskFunctionsHandler:
     121    test    dl, dl                      ; Floppy Drive?
     122    jns     SHORT DirectCallToFloppyHandler40h
     123WeHandleTheFloppyFunction:
     124
    96125%ifndef RELOCATE_INT13H_STACK
    97126    sti                                 ; Enable interrupts
    98 %endif
     127%endif 
    99128    cld                                 ; String instructions to increment pointers
    100129    CREATE_FRAME_INTPACK_TO_SSBP    SIZE_OF_IDEPACK_WITHOUT_INTPACK
    … …  
    138167    jz      SHORT .OurFunction          ; We handle all function 0h requests (resets)
    139168
    140 %ifndef MODULE_SERIAL_FLOPPY
    141 ; Without floppy support, we handle only hard disk traffic for function 08h.
    142     test    dl, dl
    143     jns     SHORT Int13h_DirectCallToAnotherBios
    144 %endif
    145 ; With floppy support, we handle all traffic for function 08h, as we need to wrap both hard disk and floppy drive counts.
    146     cmp     ah, 8
     169; We handle all traffic for function 08h, as we need to wrap both hard disk and floppy drive counts.
     170    cmp     ah, GET_DRIVE_PARAMETERS    ; 08h
    147171    je      SHORT .OurFunction
    148172    ; Fall to Int13h_DirectCallToAnotherBios
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