source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Device/IDE/IdeDPT.asm

; Project name  :   XTIDE Universal BIOS
; Description   :   Sets IDE Device specific parameters to DPT.

;
; 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

;--------------------------------------------------------------------
; IdeDPT_Finalize
;   Parameters:
;       DS:DI:  Ptr to Disk Parameter Table
;       ES:SI:  Ptr to 512-byte ATA information read from the drive
;       CS:BP:  Ptr to IDEVARS for the controller
;   Returns:
;       CF:     Clear, IDE interface only supports hard disks
;   Corrupts registers:
;       AX, BX, CX, DX
;--------------------------------------------------------------------
IdeDPT_Finalize:    ; Unused entrypoint OK

%ifdef MODULE_POWER_MANAGEMENT
;--------------------------------------------------------------------
; .DetectPowerManagementSupport
;   Parameters:
;       DS:DI:  Ptr to Disk Parameter Table
;       ES:SI:  Ptr to 512-byte ATA information read from the drive
;   Returns:
;       Nothing
;   Corrupts registers:
;       AX
;--------------------------------------------------------------------
.DetectPowerManagementSupport:
    mov     ax, A6_wSetSup83_APM << 8 | A6_wSetSup82_POWERMAN   ; Both of these flags are bit 3
    and     ah, [es:si+ATA6.wSetSup83]
    and     al, [es:si+ATA6.wSetSup82]
    eSHL_IM ah, 1                       ; APM bit 3 to bit 4 (same as FLGH_DPT_APM_SUPPORTED)
    or      al, ah
    or      [di+DPT.bFlagsHigh], al     ; FLGH_DPT_POWER_MANAGEMENT_SUPPORTED and FLGH_DPT_APM_SUPPORTED
%endif ; MODULE_POWER_MANAGEMENT


;--------------------------------------------------------------------
; .StoreDeviceType
;   Parameters:
;       DS:DI:  Ptr to Disk Parameter Table
;       CS:BP:  Ptr to IDEVARS for the controller
;   Returns:
;       Nothing
;   Corrupts registers:
;       AL
;--------------------------------------------------------------------
.StoreDeviceType:
    call    IdeDPT_StoreDeviceTypeToDPTinDSDIfromIdevarsInCSBP


;--------------------------------------------------------------------
; .StoreBlockMode
;   Parameters:
;       DS:DI:  Ptr to Disk Parameter Table
;   Returns:
;       Nothing
;   Corrupts registers:
;       Nothing
;--------------------------------------------------------------------
.StoreBlockMode:
    mov     BYTE [di+DPT_ATA.bBlockSize], 1


%ifdef MODULE_ADVANCED_ATA
;--------------------------------------------------------------------
; .StorePioModeAndTimings
;   Parameters:
;       DS:DI:  Ptr to Disk Parameter Table
;       ES:SI:  Ptr to 512-byte ATA information read from the drive
;       CS:BP:  Ptr to IDEVARS for the controller
;   Returns:
;       Nothing
;   Corrupts registers:
;       AX, BX, CX
;--------------------------------------------------------------------
.StorePioMode:
    call    AtaID_GetMaxPioModeToAXandMinCycleTimeToCX
    mov     [di+DPT_ADVANCED_ATA.wMinPioCycleTime], cx
    mov     [di+DPT_ADVANCED_ATA.bPioMode], al
    or      [di+DPT.bFlagsHigh], ah


;--------------------------------------------------------------------
; .DetectAdvancedIdeController
;   Parameters:
;       DS:DI:  Ptr to Disk Parameter Table
;       ES:SI:  Ptr to 512-byte ATA information read from the drive
;       CS:BP:  Ptr to IDEVARS for the controller
;   Returns:
;       Nothing
;   Corrupts registers:
;       AX, BX, CX, DX
;--------------------------------------------------------------------
.DetectAdvancedIdeController:
    ; Detection is only relevant on standard devices. XT-CF seems to give false positive for
    ; PDC20x30 detection so better to skip detection for 8-bit devices
    cmp     BYTE [di+DPT_ATA.bDevice], DEVICE_32BIT_ATA
    ja      SHORT .NoAdvancedControllerDetected

    mov     bx, [di+DPT.wBasePort]
    call    AdvAtaInit_DetectControllerForIdeBaseInBX
    mov     [di+DPT_ADVANCED_ATA.wControllerID], ax ; Store zero if none detected
    mov     [di+DPT_ADVANCED_ATA.wControllerBasePort], dx
    jnc     SHORT .NoAdvancedControllerDetected

    ; Use highest common PIO mode from controller and drive.
    ; Many VLB controllers support PIO modes up to 2.
    call    AdvAtaInit_GetControllerMaxPioModeToALandMinPioCycleTimeToBX
    jnz     SHORT .ChangeTo32bitDevice

    and     [di+DPT.bFlagsHigh], ah     ; Mask off FLGH_DPT_IORDY if IORDY not supported
    MIN_U   [di+DPT_ADVANCED_ATA.bPioMode], al
    mov     [di+DPT_ADVANCED_ATA.wMinPioCycleTime], bx

    ; We have detected 32-bit controller so change Device Type
    ; since it might have been set to 16-bit on IDEVARS
.ChangeTo32bitDevice:
    ; *FIXME* We might need to add code to detect the IBM 486SLC2 CPU (and possibly other
    ; 386+ class CPUs with a 16-bit external bus?) to avoid changing to DEVICE_32BIT_ATA.
    mov     BYTE [di+DPT_ATA.bDevice], DEVICE_32BIT_ATA
.NoAdvancedControllerDetected:
%endif  ; MODULE_ADVANCED_ATA

    ; End DPT
    clc
    ret


;--------------------------------------------------------------------
; IdeDPT_StoreDeviceTypeToDPTinDSDIfromIdevarsInCSBP
;   Parameters:
;       DS:DI:  Ptr to Disk Parameter Table
;       CS:BP:  Ptr to IDEVARS for the controller
;   Returns:
;       Nothing
;   Corrupts registers:
;       AL
;--------------------------------------------------------------------
IdeDPT_StoreDeviceTypeToDPTinDSDIfromIdevarsInCSBP:
    mov     al, [cs:bp+IDEVARS.bDevice]
    mov     [di+DPT_ATA.bDevice], al
    ret