source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Menus/BootMenu/BootMenuEvent.asm@ 502

; Project name  :   XTIDE Universal BIOS
; Description   :   Boot Menu event handler for menu library callbacks.

;
; 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

;--------------------------------------------------------------------
; GetMenuitemToDXforDriveInDL
;   Parameters:
;       DL:     Drive number
;   Returns:
;       DX:     Menuitem index (assuming drive is available)
;   Corrupts registers:
;       AX
;--------------------------------------------------------------------
GetMenuitemToDXforDriveInDL:
    xor     dh, dh                      ; Drive number now in DX
    test    dl, dl
    jns     SHORT .ReturnItemIndexInDX  ; Return if floppy drive (HD bit not set)
    call    FloppyDrive_GetCountToAX
    and     dl, ~80h                    ; Clear HD bit
    add     dx, ax
.ReturnItemIndexInDX:
    ret


;--------------------------------------------------------------------
; BootMenuEvent_Handler
;   Common parameters for all events:
;       BX:         Menu event (anything from MENUEVENT struct)
;       SS:BP:      Menu library handle
;   Common return values for all events:
;       CF:         Set if event processed
;                   Cleared if event not processed
;   Corrupts registers:
;       All
;--------------------------------------------------------------------
BootMenuEvent_Handler:
    LOAD_BDA_SEGMENT_TO es, di
    call    RamVars_GetSegmentToDS

%ifdef MENUEVENT_INLINE_OFFSETS

    add     bx, FirstEvent
    jmp     bx

.EventNotHandled:
.DoNotSetDefaultMenuitem:
    xor     dx, dx      ; Clear CF (and menuitem index for DoNotSetDefaultMenuitem)
    ret

MENUEVENT_InitializeMenuinitFromDSSI equ  (EventInitializeMenuinitFromSSBP - FirstEvent)
MENUEVENT_ExitMenu equ  (BootMenuEvent_Completed - FirstEvent)
MENUEVENT_ItemHighlightedFromCX equ (EventItemHighlightedFromCX - FirstEvent)
MENUEVENT_ItemSelectedFromCX equ (EventItemSelectedFromCX - FirstEvent)
MENUEVENT_RefreshTitle equ (BootMenuPrint_TitleStrings - FirstEvent)
MENUEVENT_RefreshInformation equ (BootMenuPrint_RefreshInformation - FirstEvent)
MENUEVENT_RefreshItemFromCX equ (BootMenuPrint_RefreshItem - FirstEvent)
;
; Note that there is no entry for MENUEVENT_IdleProcessing.  If MENUEVENT_IDLEPROCESSING_ENABLE is not %defined,
; then the entry point will not be called (saving memory on this end and at the CALL point).
;

%else

    cmp     bx, BYTE MENUEVENT.RefreshItemFromCX    ; Above last supported item?
    ja      SHORT .EventNotHandled
    jmp     [cs:bx+rgfnEventSpecificHandlers]

.EventNotHandled:
.DoNotSetDefaultMenuitem:
    xor     dx, dx      ; Clear CF (and menuitem index for DoNotSetDefaultMenuitem)
    ret

rgfnEventSpecificHandlers:
    dw      EventInitializeMenuinitFromSSBP     ; MENUEVENT.InitializeMenuinitFromDSSI
    dw      EventCompleted                      ; MENUEVENT.ExitMenu
    dw      EventNotHandled                     ; MENUEVENT.IdleProcessing
    dw      EventItemHighlightedFromCX          ; MENUEVENT.ItemHighlightedFromCX
    dw      EventItemSelectedFromCX             ; MENUEVENT.ItemSelectedFromCX
    dw      EventKeyStrokeInAX                  ; MENUEVENT.KeyStrokeInAX
    dw      BootMenuPrint_TitleStrings          ; MENUEVENT.RefreshTitle
    dw      BootMenuPrint_RefreshInformation    ; MENUEVENT.RefreshInformation
    dw      BootMenuPrint_RefreshItem           ; MENUEVENT.RefreshItemFromCX

%endif


;--------------------------------------------------------------------
; EventInitializeMenuinitFromSSBP
;   Parameters
;       DS:     Ptr to RAMVARS
;       ES:     Ptr to BDA (zero)
;       SS:BP:  Ptr to MENUINIT struct to initialize
;   Returns:
;       CF:     Set if event processed
;               Cleared if event not processed
;   Corrupts registers:
;       Does not matter
;--------------------------------------------------------------------
FirstEvent: 
EventInitializeMenuinitFromSSBP:
    ; Store default Menuitem (=default drive to boot from)
    xor     dx, dx
    mov     [bp+MENUINIT.wHighlightedItem], dx

    ; Store number of Menuitems
    call    RamVars_GetHardDiskCountFromBDAtoAX
    xchg    ax, cx
    call    FloppyDrive_GetCountToAX
    add     ax, cx
    inc     ax                              ; extra entry for ROM Boot item
    mov     [bp+MENUINIT.wItems], ax
                
    ; Store menu size
    mov     WORD [bp+MENUINIT.wTitleAndInfoLines], BOOT_MENU_TITLE_AND_INFO_LINES
    mov     BYTE [bp+MENUINIT.bWidth], BOOT_MENU_WIDTH
    add     al, BOOT_MENU_HEIGHT_WITHOUT_ITEMS
    xchg    cx, ax
    CALL_DISPLAY_LIBRARY    GetColumnsToALandRowsToAH
    MIN_U   ah, cl
    mov     [bp+MENUINIT.bHeight], ah

    ; Store selection timeout
    mov     ax, [cs:ROMVARS.wBootTimeout]
    CALL_MENU_LIBRARY StartSelectionTimeoutWithTicksInAX
    stc
    ret


;--------------------------------------------------------------------
; EventItemHighlightedFromCX
;   Parameters
;       CX:     Index of new highlighted item
;       DX:     Index of previously highlighted item or NO_ITEM_HIGHLIGHTED
;       DS:     Ptr to RAMVARS
;       ES:     Ptr to BDA (zero)
;       SS:BP:  Menu library handle
;   Returns:
;       CF:     Set if event processed
;               Cleared if event not processed
;   Corrupts registers:
;       Does not matter
;--------------------------------------------------------------------
EventItemHighlightedFromCX:
    push    cx
    call    BootMenu_GetDriveToDXforMenuitemInCX        
    jnc     .noDriveSwap        
    call    DriveXlate_SetDriveToSwap
.noDriveSwap:   
        
    ; Redraw changes in drive numbers
    xor     ax, ax  ; Update first floppy drive (for translated drive number)
    CALL_MENU_LIBRARY   RefreshItemFromAX
    mov     dl, 80h
    call    GetMenuitemToDXforDriveInDL
    xchg    ax, dx  ; Update first hard disk (for translated drive number)
    CALL_MENU_LIBRARY   RefreshItemFromAX
    pop     ax      ; Update new item (for translated drive number)
    CALL_MENU_LIBRARY   RefreshItemFromAX
    CALL_MENU_LIBRARY   RefreshInformation
    stc
    ret

        
;--------------------------------------------------------------------
; EventItemSelectedFromCX
;   Parameters
;       CX:     Index of selected item
;       DS:     Ptr to RAMVARS
;       ES:     Ptr to BDA (zero)
;       SS:BP:  Menu library handle
;   Returns:
;       CF:     Set if event processed
;               Cleared if event not processed
;   Corrupts registers:
;       Does not matter
;--------------------------------------------------------------------
EventItemSelectedFromCX:
    ; Fall to CloseBootMenu


;--------------------------------------------------------------------
; CloseBootMenu
;   Parameters
;       DS:     RAMVARS segment
;       ES:     BDA segment (zero)
;   Returns:
;       Nothing
;   Corrupts registers:
;       Does not matter
;--------------------------------------------------------------------
CloseBootMenu:
    CALL_MENU_LIBRARY   Close
    ; Fall to BootMenuEvent_Completed

        
;--------------------------------------------------------------------
; BootMenuEvent_Completed
;   Parameters
;       Nothing
;   Returns:
;       CF:     Set to exit from menu
;   Corrupts registers:
;       Nothing
;--------------------------------------------------------------------
BootMenuEvent_Completed:
    stc
    ret