source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Device/IDE/IdeCommand.asm@ 590

; Project name  :   XTIDE Universal BIOS
; Description   :   IDE Device Command functions.

;
; XTIDE Universal BIOS and Associated Tools
; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 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

;--------------------------------------------------------------------
; IdeCommand_ResetMasterAndSlaveController
;   Parameters:
;       DS:DI:  Ptr to DPT (in RAMVARS segment)
;   Returns:
;       AH:     INT 13h Error Code
;       CF:     Cleared if success, Set if error
;   Corrupts registers:
;       AL, BX, CX, DX
;--------------------------------------------------------------------
IdeCommand_ResetMasterAndSlaveController:
    ; HSR0: Set_SRST
; Used to be:
;   call    AccessDPT_GetDeviceControlByteToAL
;   or      al, FLG_DEVCONTROL_SRST | FLG_DEVCONTROL_nIEN   ; Set Reset bit
; Is now:
    mov     al, FLG_DEVCONTROL_SRST | FLG_DEVCONTROL_nIEN
; ---
    OUTPUT_AL_TO_IDE_CONTROL_BLOCK_REGISTER     DEVICE_CONTROL_REGISTER_out
    mov     ax, HSR0_RESET_WAIT_US
    call    Timer_DelayMicrosecondsFromAX

    ; HSR1: Clear_wait
; Used to be:
;   call    AccessDPT_GetDeviceControlByteToAL
;   or      al, FLG_DEVCONTROL_nIEN
;   and     al, ~FLG_DEVCONTROL_SRST                        ; Clear reset bit
; Is now:
    mov     al, FLG_DEVCONTROL_nIEN
; ---
    OUTPUT_AL_TO_IDE_CONTROL_BLOCK_REGISTER     DEVICE_CONTROL_REGISTER_out
    mov     ax, HSR1_RESET_WAIT_US
    call    Timer_DelayMicrosecondsFromAX

    ; HSR2: Check_status
    mov     bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_MAXIMUM, FLG_STATUS_BSY)
    jmp     IdeWait_PollStatusFlagInBLwithTimeoutInBH

; *FIXME* AccessDPT_GetDeviceControlByteToAL currently always returns with
; AL cleared (0) or with only bit 1 set (FLG_DEVCONTROL_nIEN = 2).
; The commented away instructions above sets FLG_DEVCONTROL_nIEN anyway
; making the call to AccessDPT_GetDeviceControlByteToAL redundant.
; I have left this code as is since I don't know if it's a mistake
; (from all the way back to r150) or if it's coded this way in anticipation
; of some future changes to AccessDPT_GetDeviceControlByteToAL.

;--------------------------------------------------------------------
; IdeCommand_IdentifyDeviceToBufferInESSIwithDriveSelectByteInBH
;   Parameters:
;       BH:     Drive Select byte for Drive and Head Select Register
;       DX:     Autodetected port for XT-CF
;       DS:     Segment to RAMVARS
;       ES:SI:  Ptr to buffer to receive 512-byte IDE Information
;       CS:BP:  Ptr to IDEVARS
;   Returns:
;       AH:     INT 13h Error Code
;       CF:     Cleared if success, Set if error
;   Corrupts registers:
;       AL, BX, CX, DX, SI, DI, ES
;--------------------------------------------------------------------
IdeCommand_IdentifyDeviceToBufferInESSIwithDriveSelectByteInBH:
    ; Create fake DPT to be able to use Device.asm functions
    call    FindDPT_ForNewDriveToDSDI
    eMOVZX  ax, bh
    mov     [di+DPT.wFlags], ax
    call    CreateDPT_StoreIdevarsOffsetAndBasePortFromCSBPtoDPTinDSDI
    call    IdeDPT_StoreDeviceTypeToDPTinDSDIfromIdevarsInCSBP
    mov     BYTE [di+DPT_ATA.bBlockSize], 1 ; Block = 1 sector

    ; Wait until drive motors have reached full speed
    cmp     bp, BYTE ROMVARS.ideVars0   ; First controller?
    jne     SHORT .SkipLongWaitSinceDriveIsNotPrimaryMaster
    test    bh, FLG_DRVNHEAD_DRV        ; Wait already done for Master
    jnz     SHORT .SkipLongWaitSinceDriveIsNotPrimaryMaster
    mov     bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_MOTOR_STARTUP, FLG_STATUS_BSY)
    call    IdeWait_PollStatusFlagInBLwithTimeoutInBH
.SkipLongWaitSinceDriveIsNotPrimaryMaster:

    ; Create IDEPACK without INTPACK
    push    bp
    call    Idepack_FakeToSSBP

%ifdef MODULE_8BIT_IDE
    push    si

    ; Enable 8-bit PIO for DEVICE_8BIT_ATA (no need to verify device type here)
    call    AH9h_Enable8bitModeForDevice8bitAta

    ; Set XT-CF mode. No need to check here if device is XT-CF or not.
%ifdef MODULE_8BIT_IDE_ADVANCED
    call    AH1Eh_GetCurrentXTCFmodeToAX    ; Reads from DPT_ATA.bDevice that we just stored
    call    AH9h_SetModeFromALtoXTCF        ; Enables/disables 8-bit mode when necessary
%endif ; MODULE_8BIT_IDE_ADVANCED
    pop     si
%endif ; MODULE_8BIT_IDE

    ; Prepare to output Identify Device command
    mov     dl, 1                       ; Sector count (required by IdeTransfer.asm)
    mov     al, COMMAND_IDENTIFY_DEVICE
    mov     bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_DRQ, FLG_STATUS_DRQ)
    call    Idepack_StoreNonExtParametersAndIssueCommandFromAL

    ; Clean stack and return
    lea     sp, [bp+SIZE_OF_IDEPACK_WITHOUT_INTPACK]    ; This assumes BP hasn't changed between Idepack_FakeToSSBP and here
    pop     bp
    ret


;--------------------------------------------------------------------
; IdeCommand_OutputWithParameters
;   Parameters:
;       BH:     System timer ticks for timeout
;       BL:     IDE Status Register bit to poll after command
;       ES:SI:  Ptr to buffer (for data transfer commands)
;       DS:DI:  Ptr to DPT (in RAMVARS segment)
;       SS:BP:  Ptr to IDEPACK
;   Returns:
;       AH:     INT 13h Error Code
;       CX:     Number of successfully transferred sectors (for transfer commands)
;       CF:     Cleared if success, Set if error
;   Corrupts registers:
;       AL, BX, (CX), DX, (ES:SI for data transfer commands)
;--------------------------------------------------------------------
ALIGN JUMP_ALIGN
IdeCommand_OutputWithParameters:
    push    bx                      ; Store status register bits to poll

    ; Select Master or Slave drive and output head number or LBA28 top bits
    call    IdeCommand_SelectDrive
    jc      SHORT .DriveNotReady

    ; Output Device Control Byte to enable or disable interrupts
    mov     al, [bp+IDEPACK.bDeviceControl]
%ifdef MODULE_IRQ
    test    al, FLG_DEVCONTROL_nIEN ; Interrupts disabled?
    jnz     SHORT .DoNotSetInterruptInServiceFlag

    ; Clear Task Flag and set Interrupt In-Service Flag
    push    ds
    LOAD_BDA_SEGMENT_TO ds, dx
    mov     BYTE [BDA.bHDTaskFlg], 1    ; Will be adjusted to zero later
    pop     ds
.DoNotSetInterruptInServiceFlag:
%endif
    OUTPUT_AL_TO_IDE_CONTROL_BLOCK_REGISTER     DEVICE_CONTROL_REGISTER_out

    ; Output Feature Number
    mov     al, [bp+IDEPACK.bFeatures]
    OUTPUT_AL_TO_IDE_REGISTER   FEATURES_REGISTER_out

    ; Output Sector Address High (only used by LBA48)
%ifdef MODULE_EBIOS
    eMOVZX  ax, [bp+IDEPACK.bLbaLowExt]     ; Zero sector count
    mov     cx, [bp+IDEPACK.wLbaMiddleAndHighExt]
    call    OutputSectorCountAndAddress
%endif

    ; Output Sector Address Low
    mov     ax, [bp+IDEPACK.wSectorCountAndLbaLow]
    mov     cx, [bp+IDEPACK.wLbaMiddleAndHigh]
    call    OutputSectorCountAndAddress

    ; Output command
    mov     al, [bp+IDEPACK.bCommand]
    OUTPUT_AL_TO_IDE_REGISTER   COMMAND_REGISTER_out

    ; Wait until command completed
    pop     bx                              ; Pop status and timeout for polling
    cmp     bl, FLG_STATUS_DRQ              ; Data transfer started?
    jne     SHORT .WaitUntilNonTransferCommandCompletes
%ifdef MODULE_8BIT_IDE_ADVANCED
    cmp     BYTE [di+DPT_ATA.bDevice], DEVICE_8BIT_JRIDE_ISA
    jae     SHORT JrIdeTransfer_StartWithCommandInAL    ; DEVICE_8BIT_JRIDE_ISA or DEVICE_8BIT_ADP50L
%endif
    jmp     IdeTransfer_StartWithCommandInAL

.WaitUntilNonTransferCommandCompletes:
%ifdef MODULE_IRQ
    test    BYTE [bp+IDEPACK.bDeviceControl], FLG_DEVCONTROL_nIEN
    jz      SHORT .PollStatusFlagInsteadOfWaitIrq
    jmp     IdeWait_IRQorStatusFlagInBLwithTimeoutInBH
.PollStatusFlagInsteadOfWaitIrq:
%endif
    jmp     IdeWait_PollStatusFlagInBLwithTimeoutInBH

.DriveNotReady:
    pop     bx                          ; Clean stack
    ret


;--------------------------------------------------------------------
; IdeCommand_SelectDrive
;   Parameters:
;       DS:DI:  Ptr to DPT (in RAMVARS segment)
;       SS:BP:  Ptr to IDEPACK
;   Returns:
;       AH:     INT 13h Error Code
;       CF:     Cleared if success, Set if error
;   Corrupts registers:
;       AL, BX, CX, DX
;--------------------------------------------------------------------
ALIGN JUMP_ALIGN
IdeCommand_SelectDrive:
    ; We use different timeout value when detecting drives.
    ; This prevents unnecessary long delays when drive is not present.
    mov     cx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_DRDY, FLG_STATUS_DRDY)
    cmp     WORD [RAMVARS.wDrvDetectSignature], RAMVARS_DRV_DETECT_SIGNATURE
    eCMOVE  ch, TIMEOUT_SELECT_DRIVE_DURING_DRIVE_DETECTION

    ; Select Master or Slave Drive
    mov     al, [bp+IDEPACK.bDrvAndHead]
    OUTPUT_AL_TO_IDE_REGISTER   DRIVE_AND_HEAD_SELECT_REGISTER
    mov     bx, cx
    call    IdeWait_PollStatusFlagInBLwithTimeoutInBH

    ; Ignore errors from IDE Error Register (set by previous command)
    cmp     ah, RET_HD_TIMEOUT
    je      SHORT .FailedToSelectDrive
    xor     ax, ax                  ; Always success unless timeout
    ret
.FailedToSelectDrive:
    stc
    ret


;--------------------------------------------------------------------
; OutputSectorCountAndAddress
;   Parameters:
;       AH:     LBA low bits (Sector Number)
;       AL:     Sector Count
;       CL:     LBA middle bits (Cylinder Number low)
;       CH:     LBA high bits (Cylinder Number high)
;       DS:DI:  Ptr to DPT (in RAMVARS segment)
;   Returns:
;       Nothing
;   Corrupts registers:
;       AL, BX, DX
;--------------------------------------------------------------------
ALIGN JUMP_ALIGN
OutputSectorCountAndAddress:
    OUTPUT_AL_TO_IDE_REGISTER   SECTOR_COUNT_REGISTER

    mov     al, ah
    OUTPUT_AL_TO_IDE_REGISTER   LBA_LOW_REGISTER

    mov     al, cl
    OUTPUT_AL_TO_IDE_REGISTER   LBA_MIDDLE_REGISTER

    mov     al, ch
    OUTPUT_AL_TO_IDE_REGISTER   LBA_HIGH_REGISTER
    ret