Ignore:
Timestamp:
Feb 24, 2012, 10:28:31 AM (12 years ago)
Author:
gregli@…
google:author:
gregli@hotmail.com
Message:

More optimizations. Merged RamVars_IsFunction/DriveHandledByThisBIOS in with FindDPT_ForDriveNumber, since they are often used together, making a returned NULL DI pointer indicate a foreign drive in many places. Revamped the iteration done in the handlers for int13/0dh and int13h/0h. Added serial specific print string during drive detection.

File:
1 edited

Legend:

Unmodified
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Removed

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

    r200 r262  
    4040;       CF:     0 if succesfull, 1 if error
    4141;   Corrupts registers:
    42 ;       AL, CX, SI, DI
     42;       AL, CX, SI
    4343;--------------------------------------------------------------------
    4444;ALIGN JUMP_ALIGN
    … …  
    4646    push    dx
    4747    push    bx
     48    push    di
    4849
    49     call    FindDPT_ForDriveNumber      ; DS:DI now points to DPT
    5050    call    Interrupts_UnmaskInterruptControllerForDriveInDSDI
    5151    call    Device_ResetMasterAndSlaveController
    52     ;jc     SHORT .ReturnError          ; CF would be set if slave drive present without master
    53                                         ; (error register has special values after reset)
     52    ;jc     SHORT .ReturnError                  ; CF would be set if slave drive present without master
     53                                                ; (error register has special values after reset)
    5454
    5555    ; Initialize Master and Slave drives
    56     eMOVZX  bx, BYTE [di+DPT.bIdevarsOffset]
    57     mov     dx, [cs:bx+IDEVARS.wPort]
    58     call    InitializeMasterAndSlaveDriveFromPortInDX
     56    mov     al, [di+DPT.bIdevarsOffset]         ; pointer to controller we are looking to reset
     57    mov     ah, 0                               ; initialize error code, assume success
     58       
     59    mov     si, IterateAndResetDrives
     60    call    IterateAllDPTs
    5961
     62    shr     ah, 1                               ; Move error code and CF into proper position
     63
     64    pop     di
    6065    pop     bx
    6166    pop     dx
    6267    ret
    6368
    64 
    6569;--------------------------------------------------------------------
    66 ; InitializeMasterAndSlaveDriveFromPortInDX
    67 ;   Parameters:
    68 ;       DX:     IDE Base Port address
    69 ;       SS:BP:  Ptr to IDEPACK
    70 ;   Returns:
    71 ;       AH:     Error code
    72 ;       CF:     0 if initialization succesfull
    73 ;               1 if any error
    74 ;   Corrupts registers:
    75 ;       AL, BX, CX, DX, SI, DI
     70; IterateAndResetDrives: Iteration routine for use with IterateAllDPTs.
     71;
     72; When a drive on the controller is found, it is reset, and the error code
     73; merged into overall error code for this controller.  Master will be reset
     74; first.  Note that the iteration will go until the end of the DPT list.
    7675;--------------------------------------------------------------------
    77 ALIGN JUMP_ALIGN
    78 InitializeMasterAndSlaveDriveFromPortInDX:
    79     push    dx                          ; Store base port address
    80     xor     cx, cx                      ; Assume no errors
    81     FindDPT_ToDSDIForIdeMasterAtPortDX
    82     jnc     SHORT .InitializeSlave      ; Master drive not present
    83     call    AH9h_InitializeDriveForUse
    84     mov     cl, ah                      ; Copy error code to CL
    85 .InitializeSlave:
    86     pop     dx                          ; Restore base port address
    87     FindDPT_ToDSDIForIdeSlaveAtPortDX
    88     jnc     SHORT .CombineErrors        ; Slave drive not present
    89     call    AH9h_InitializeDriveForUse
    90     mov     ch, ah                      ; Copy error code to CH
    91 .CombineErrors:
    92     or      cl, ch                      ; OR error codes, clear CF
    93     jz      SHORT .Return
    94     mov     ah, RET_HD_RESETFAIL        ; Load Reset Failed error code
    95     stc
    96 .Return:
     76IterateAndResetDrives:
     77    cmp     al, [di+DPT.bIdevarsOffset]         ; The right controller?
     78    jnz     .done
     79    push    ax
     80    call    AH9h_InitializeDriveForUse          ; Reset Master and Slave (Master will come first in DPT list)
     81    pop     ax     
     82    jc      .done
     83    or      ah, (RET_HD_RESETFAIL << 1) | 1     ; OR in Reset Failed error code and CF, will SHR into position later
     84.done:
     85    stc                                         ; From IterateAllDPTs perspective, the DPT is never found
    9786    ret
     87       
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