source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Device/IDE/IdeCommand.asm@ 465

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

;
; 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

;--------------------------------------------------------------------
; 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
    call    AccessDPT_GetDeviceControlByteToAL
    or      al, FLG_DEVCONTROL_SRST | FLG_DEVCONTROL_nIEN   ; Set Reset bit
    OUTPUT_AL_TO_IDE_CONTROL_BLOCK_REGISTER     DEVICE_CONTROL_REGISTER_out
    mov     ax, HSR0_RESET_WAIT_US
    call    Timer_DelayMicrosecondsFromAX

    ; HSR1: Clear_wait
    call    AccessDPT_GetDeviceControlByteToAL
    or      al, FLG_DEVCONTROL_nIEN
    and     al, ~FLG_DEVCONTROL_SRST                        ; Clear reset bit
    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


;--------------------------------------------------------------------
; IdeCommand_IdentifyDeviceToBufferInESSIwithDriveSelectByteInBH
;   Parameters:
;       BH:     Drive Select byte for Drive and Head Select Register
;       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
    mov     [di+DPT.bIdevarsOffset], bp
    mov     BYTE [di+DPT_ATA.bBlockSize], 1 ; Block = 1 sector
    call    IdeDPT_StoreDeviceTypeFromIdevarsInCSBPtoDPTinDSDI

    ; 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
    call    AHDh_WaitUntilDriveMotorHasReachedFullSpeed
.SkipLongWaitSinceDriveIsNotPrimaryMaster:

    ; Create IDEPACK without INTPACK
    push    bp
    call    Idepack_FakeToSSBP

%ifdef MODULE_8BIT_IDE
    ; Enable 8-bit PIO mode for Lo-tech XT-CF
    push    si
    call    AH9h_Enable8bitPioModeForXTCF
    pop     si
    jc      SHORT .FailedToSet8bitMode
%endif

    ; 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
.FailedToSet8bitMode:
    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
    or      BYTE [di+DPT.bFlagsHigh], FLGH_DPT_INTERRUPT_IN_SERVICE
    push    ds
    LOAD_BDA_SEGMENT_TO ds, dx, !   ; Also zero DX
    mov     [BDA.bHDTaskFlg], dl
    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_JRIDE
    cmp     BYTE [di+DPT_ATA.bDevice], DEVICE_8BIT_JRIDE_ISA
    je      SHORT JrIdeTransfer_StartWithCommandInAL
%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     bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_DRDY, FLG_STATUS_DRDY)
    cmp     WORD [RAMVARS.wDrvDetectSignature], RAMVARS_DRV_DETECT_SIGNATURE
    eCMOVE  bh, 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
    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
    JUMP_TO_OUTPUT_AL_TO_IDE_REGISTER   LBA_HIGH_REGISTER