source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AH9h_HInit.asm@ 399

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

;
; XTIDE Universal BIOS and Associated Tools
; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2012 by XTIDE Universal BIOS Team.
;
; This program is free software; you can redistribute it and/or modify
; it under the terms of the GNU General Public License as published by
; the Free Software Foundation; either version 2 of the License, or
; (at your option) any later version.
;
; This program is distributed in the hope that it will be useful,
; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
; GNU General Public License for more details.
; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
;

; 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


;--------------------------------------------------------------------
; Initialize 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:
    xor     ax, ax

    ; Clear Initialization Error flags from DPT
    mov     [di+DPT_ATA.bInitError], al

%ifdef MODULE_SERIAL
    ; No need to do this for serial devices
    test    BYTE [di+DPT.bFlagsHigh], FLGH_DPT_SERIAL_DEVICE    ; Clears CF
    jz      SHORT .ContinueInitialization
    ret     ; With AH and CF cleared
    .ContinueInitialization:
%endif

    push    es
    push    si

;;; SelectDrive
    ; 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      .ReturnWithErrorCodeInAH

;;; InitializeDeviceParameters
    ; Initialize CHS parameters if LBA is not used
    test    BYTE [di+DPT.bFlagsLow], FLG_DRVNHEAD_LBA
    jnz     SHORT .SkipInitializeDeviceParameters       ; No need to initialize CHS parameters if LBA mode enabled

    ; 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)
    call    Idepack_StoreNonExtParametersAndIssueCommandFromAL

    mov     al, FLG_INITERROR_FAILED_TO_INITIALIZE_CHS_PARAMETERS
    call    .SetErrorFlagFromALwithErrorCodeInAH
.SkipInitializeDeviceParameters:

;;; SetWriteCache
    ; Enable or Disable Write Cache
    call    AccessDPT_GetPointerToDRVPARAMStoCSBX
    mov     bl, [cs:bx+DRVPARAMS.wFlags]
    push    bx  ; Save .wFlags for later use in InitializeBlockMode
    and     bx, BYTE MASK_DRVPARAMS_WRITECACHE
    jz      SHORT .SkipSetWriteCache        ; DEFAULT_WRITE_CACHE
    mov     si, [cs:bx+.rgbWriteCacheCommands]
    call    AH23h_SetControllerFeatures

    mov     al, FLG_INITERROR_FAILED_TO_SET_WRITE_CACHE
    call    .SetErrorFlagFromALwithErrorCodeInAH
.SkipSetWriteCache:

;;; RecalibrateDrive
    ; Recalibrate drive by seeking to cylinder 0
    call    AH11h_RecalibrateDrive

    mov     al, FLG_INITERROR_FAILED_TO_RECALIBRATE_DRIVE
    call    .SetErrorFlagFromALwithErrorCodeInAH

;;; InitializeBlockMode
    ; Initialize block mode transfers
    pop     ax  ; Restore .wFlags saved in SetWriteCache
    test    BYTE [di+DPT.bFlagsHigh], FLGH_DPT_BLOCK_MODE_SUPPORTED
    jz      SHORT .BlockModeNotSupportedOrDisabled
    test    al, 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  ; Stores block size to DPT
    jnc     SHORT .SupportedBlockSizeFound
    shr     bl, 1
    jnc     SHORT .TryNextBlockSize

    mov     al, FLG_INITERROR_FAILED_TO_SET_BLOCK_MODE
    call    .SetErrorFlagFromALwithErrorCodeInAH
.BlockModeNotSupportedOrDisabled:
.SupportedBlockSizeFound:

%ifdef MODULE_ADVANCED_ATA
;;; InitializePioMode
    ; Initialize fastest supported PIO mode
    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
    call    AH23h_SetControllerFeatures

    mov     al, FLG_INITERROR_FAILED_TO_SET_PIO_MODE
    call    .SetErrorFlagFromALwithErrorCodeInAH
%endif ; MODULE_ADVANCED_ATA

%ifdef MODULE_FEATURE_SETS
;;; InitStandbyTimer
    ; Initialize the standby timer (if supported)
    test    BYTE [di+DPT.bFlagsHigh], FLGH_DPT_POWER_MANAGEMENT_SUPPORTED
    jz      .NoPowerManagementSupport

    mov     al, COMMAND_IDLE
    mov     dl, [cs:ROMVARS.bIdleTimeout]
    mov     bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_BSY, FLG_STATUS_BSY)
    call    Idepack_StoreNonExtParametersAndIssueCommandFromAL

    mov     al, FLG_INITERROR_FAILED_TO_INITIALIZE_STANDBY_TIMER
    call    .SetErrorFlagFromALwithErrorCodeInAH
.NoPowerManagementSupport:
%endif ; MODULE_FEATURE_SETS

    ; There might have been several errors so just return one error code for them all
    mov     ah, [di+DPT_ATA.bInitError]
    test    ah, ah  ; Clears CF
    jz      SHORT .ReturnWithErrorCodeInAH
    mov     ah, RET_HD_RESETFAIL
    stc

.ReturnWithErrorCodeInAH:
    pop     si
    pop     es
    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
;--------------------------------------------------------------------
.IgnoreInvalidCommandError:
    xor     ah, ah  ; Clears CF

.SetErrorFlagFromALwithErrorCodeInAH:
    jnc     SHORT .NoErrorFlagToSet
    cmp     ah, RET_HD_INVALID
    jbe     SHORT .IgnoreInvalidCommandError

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


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