source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AH9h_HInit.asm@ 371

; Project name  :   XTIDE Universal BIOS
; Description   :   Int 13h function AH=9h, Initialize Drive Parameters.

; Section containing code
SECTION .text

;--------------------------------------------------------------------
; Int 13h function AH=9h, Initialize Drive Parameters.
;
; AH9h_HandlerForInitializeDriveParameters
;   Parameters:
;       DL:     Translated Drive number
;       DS:DI:  Ptr to DPT (in RAMVARS segment)
;       SS:BP:  Ptr to IDEPACK
;   Returns with INTPACK:
;       AH:     Int 13h return status
;       CF:     0 if successful, 1 if error
;--------------------------------------------------------------------
AH9h_HandlerForInitializeDriveParameters:
%ifndef USE_186
    call    AH9h_InitializeDriveForUse
    jmp     Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
%else
    push    Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
    ; Fall to AH9h_InitializeDriveForUse
%endif


;--------------------------------------------------------------------
; Initialized drive to be ready for use.
;
; AH9h_InitializeDriveForUse
;   Parameters:
;       DS:DI:  Ptr to DPT (in RAMVARS segment)
;       SS:BP:  Ptr to IDEPACK
;   Returns:
;       AH:     Int 13h return status
;       CF:     0 if successful, 1 if error
;   Corrupts registers:
;       AL, BX, CX, DX
;--------------------------------------------------------------------
AH9h_InitializeDriveForUse:
    push    es
    push    si

%ifdef MODULE_SERIAL
    ; no need to do this for serial devices
    xor     ah, ah
    test    byte [di+DPT.bFlagsHigh], FLGH_DPT_SERIAL_DEVICE    ; Clears CF
    jnz     .ReturnWithErrorCodeInAH

%else
    ; Clear Initialization Error flags from DPT
    mov     BYTE [di+DPT_ATA.bInitError], 0
%endif

    ; Try to select drive and wait until ready
    call    AccessDPT_GetDriveSelectByteToAL
    mov     [bp+IDEPACK.bDrvAndHead], al
    call    Device_SelectDrive
    mov     al, FLG_INITERROR_FAILED_TO_SELECT_DRIVE
    call    SetErrorFlagFromALwithErrorCodeInAH
    jc      SHORT .ReturnWithErrorCodeInAH

    ; Initialize CHS parameters if LBA is not used
    call    InitializeDeviceParameters
    mov     al, FLG_INITERROR_FAILED_TO_INITIALIZE_CHS_PARAMETERS
    call    SetErrorFlagFromALwithErrorCodeInAH

    ; Enable or Disable Write Cache
    call    SetWriteCache
    mov     al, FLG_INITERROR_FAILED_TO_SET_WRITE_CACHE
    call    SetErrorFlagFromALwithErrorCodeInAH

    ; Recalibrate drive by seeking to cylinder 0
.RecalibrateDrive:
    call    AH11h_RecalibrateDrive
    mov     al, FLG_INITERROR_FAILED_TO_RECALIBRATE_DRIVE
    call    SetErrorFlagFromALwithErrorCodeInAH

    ; Initialize block mode transfers
.InitializeBlockMode:
    call    InitializeBlockMode
    mov     al, FLG_INITERROR_FAILED_TO_SET_BLOCK_MODE
    call    SetErrorFlagFromALwithErrorCodeInAH

%ifdef MODULE_ADVANCED_ATA
; Initialize fastest supported PIO mode
.InitializePioMode:
    call    InitializePioMode
    mov     al, FLG_INITERROR_FAILED_TO_SET_PIO_MODE
    call    SetErrorFlagFromALwithErrorCodeInAH
%endif

    ; There might have been several errors so just return
    ; one error code for them all
    cmp     BYTE [di+DPT_ATA.bInitError], 0
    je      SHORT .ReturnWithErrorCodeInAH
    mov     ah, RET_HD_RESETFAIL
    stc

.ReturnWithErrorCodeInAH:
    pop     si
    pop     es
    ret


;--------------------------------------------------------------------
; InitializeDeviceParameters
;   Parameters:
;       DS:DI:  Ptr to DPT (in RAMVARS segment)
;       SS:BP:  Ptr to IDEPACK
;   Returns:
;       AH:     BIOS Error code
;       CF:     Cleared if successful
;               Set if any error
;   Corrupts registers:
;       AL, BX, CX, DX
;--------------------------------------------------------------------
InitializeDeviceParameters:
    ; No need to initialize CHS parameters if LBA mode enabled
    test    BYTE [di+DPT.bFlagsLow], FLG_DRVNHEAD_LBA   ; Clear CF
    jnz     SHORT ReturnSuccessSinceInitializationNotNeeded

    ; Initialize Logical Sectors per Track and Max Head number
    mov     ah, [di+DPT.bPchsHeads]
    dec     ah                          ; Max Head number
    mov     dl, [di+DPT.bPchsSectors]   ; Sectors per Track
    mov     al, COMMAND_INITIALIZE_DEVICE_PARAMETERS
    mov     bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_BSY, FLG_STATUS_BSY)
    jmp     Idepack_StoreNonExtParametersAndIssueCommandFromAL


;--------------------------------------------------------------------
; SetWriteCache
;   Parameters:
;       DS:DI:  Ptr to DPT (in RAMVARS segment)
;   Returns:
;       AH:     BIOS Error code
;       CF:     Cleared if successful
;               Set if any error
;   Corrupts registers:
;       AL, BX, CX, DX, SI
;--------------------------------------------------------------------
SetWriteCache:
    call    AccessDPT_GetPointerToDRVPARAMStoCSBX
    mov     bl, [cs:bx+DRVPARAMS.wFlags]
    and     bx, BYTE MASK_DRVPARAMS_WRITECACHE
    jz      SHORT ReturnSuccessSinceInitializationNotNeeded     ; DEFAULT_WRITE_CACHE
    mov     si, [cs:bx+.rgbWriteCacheCommands]
    jmp     AH23h_SetControllerFeatures

.rgbWriteCacheCommands:
    db      0                               ; DEFAULT_WRITE_CACHE
    db      FEATURE_DISABLE_WRITE_CACHE     ; DISABLE_WRITE_CACHE
    db      FEATURE_ENABLE_WRITE_CACHE      ; ENABLE_WRITE_CACHE


%ifdef MODULE_ADVANCED_ATA
;--------------------------------------------------------------------
; InitializePioMode
;   Parameters:
;       DS:DI:  Ptr to DPT (in RAMVARS segment)
;   Returns:
;       AH:     BIOS Error code
;       CF:     Cleared if successful
;               Set if any error
;   Corrupts registers:
;       AL, BX, CX, DX
;--------------------------------------------------------------------
InitializePioMode:
    mov     dl, PIO_DEFAULT_MODE_DISABLE_IORDY
    test    BYTE [di+DPT.bFlagsHigh], FLGH_DPT_IORDY
    jz      SHORT .IordyNotSupported

    ; Advanced PIO mode 3 and above
    mov     dl, [di+DPT_ADVANCED_ATA.bPioMode]
    or      dl, PIO_FLOW_CONTROL_MODE_xxx

.IordyNotSupported:
    mov     si, FEATURE_SET_TRANSFER_MODE
    jmp     AH23h_SetControllerFeatures
%endif


;--------------------------------------------------------------------
; InitializeBlockMode
;   Parameters:
;       DS:DI:  Ptr to DPT (in RAMVARS segment)
;   Returns:
;       AH:     BIOS Error code
;       CF:     Cleared if successful
;               Set if any error
;   Corrupts registers:
;       AL, BX, CX, DX
;--------------------------------------------------------------------
InitializeBlockMode:
    test    BYTE [di+DPT.bFlagsHigh], FLGH_DPT_BLOCK_MODE_SUPPORTED ; Clear CF
    jz      SHORT .BlockModeNotSupportedOrDisabled
    call    AccessDPT_GetPointerToDRVPARAMStoCSBX
    test    BYTE [cs:bx+DRVPARAMS.wFlags], FLG_DRVPARAMS_BLOCKMODE
    jz      SHORT .BlockModeNotSupportedOrDisabled

    ; Try block sizes until we find largest possible supported by drive
    mov     bl, 128
.TryNextBlockSize:
    mov     al, bl
    call    AH24h_SetBlockSize
    jnc     SHORT .SupportedBlockSizeFound
    shr     bl, 1                       ; Try next size
    jmp     SHORT .TryNextBlockSize
.SupportedBlockSizeFound:
    mov     [di+DPT_ATA.bBlockSize], bl
.BlockModeNotSupportedOrDisabled:
ReturnSuccessSinceInitializationNotNeeded:
    ret


;--------------------------------------------------------------------
; SetErrorFlagFromALwithErrorCodeInAH
;   Parameters:
;       AH:     BIOS Error Code
;       AL:     Error flag to set
;       DS:DI:  Ptr to DPT
;   Returns:
;       CF:     Clear if no error
;               Set if error flag was set
;   Corrupts registers:
;       Nothing
;--------------------------------------------------------------------
SetErrorFlagFromALwithErrorCodeInAH:
    jnc     SHORT .NoErrorFlagToSet
    cmp     ah, RET_HD_INVALID
    jbe     SHORT .IgnoreInvalidCommandError

    or      [di+DPT_ATA.bInitError], al
    stc
    ret
.IgnoreInvalidCommandError:
    xor     ah, ah
.NoErrorFlagToSet:
    ret