Changeset 599 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/Menus/HotkeyBar.asm

Timestamp:

Jul 14, 2018, 1:21:16 PM (6 years ago)

Author:

aitotat

Message:

Hotkey bar is now updated and drawn from system timer tick handler 1Ch. This gives much more responsive key input and makes possible to implement some simple detection animation to show that system has not frozen.

File:

• trunk/XTIDE_Universal_BIOS/Src/Menus/HotkeyBar.asm (modified) (5 diffs)

trunk/XTIDE_Universal_BIOS/Src/Menus/HotkeyBar.asm

@@ -21 +21 @@
 SECTION .text
 
+
+;--------------------------------------------------------------------
+; Handler for INT 1Ch System Timer Tick.
+; Reads key presses and draws hotkey bar.
+;
+; HotkeyBar_TimerTickHandler
+;   Parameters:
+;       DS:     RAMVARS segment
+;       ES:     BDA segment (zero)
+;   Returns:
+;       Nothing
+;   Corrupts registers:
+;       AX, CX, DX, SI, DI
+;--------------------------------------------------------------------
+HotkeyBar_TimerTickHandler:
+    push    es
+    push    ds
+%ifdef USE_186
+    ePUSHA
+%else
+    push    di
+    push    si
+    push    dx
+    push    cx
+    push    ax
+%endif
+    sti         ; Enable interrupts (is this really necessary? Do we lose key inputs if we keep interrupts disabled?)
+                ; There would be no need for FLG_HOTKEY_UPDATING if we can keep interrupts disabled during whole update.
+
+    LOAD_BDA_SEGMENT_TO es, ax
+    call    RamVars_GetSegmentToDS
+
+    ; Call previous handler
+    pushf
+    call far [es:BOOTVARS.hotkeyVars+HOTKEYVARS.fpPrevTimerHandler]
+
+    ; Do not start updating if update is already in progress (do we need this on AT systems?)
+    test    BYTE [es:BOOTVARS.hotkeyVars+HOTKEYVARS.bFlags], FLG_HOTKEY_UPDATING
+    jnz     SHORT .ReturnFromHandler
+
+    ; Update Hotkeybar (process key input and draw)
+%ifndef USE_AT  ; Ease XT systems a bit by updating every other timer tick
+    call    TimerTicks_ReadFromBdaToAX
+    shr     ax, 1
+    jnc     SHORT .ReturnFromHandler
+%endif
+    or      BYTE [es:BOOTVARS.hotkeyVars+HOTKEYVARS.bFlags], FLG_HOTKEY_UPDATING
+    call    UpdateDuringDriveDetection
+    and     BYTE [es:BOOTVARS.hotkeyVars+HOTKEYVARS.bFlags], ~FLG_HOTKEY_UPDATING
+
+.ReturnFromHandler:
+%ifdef USE_186
+    ePOPA
+%else
+    pop     ax
+    pop     cx
+    pop     dx
+    pop     si
+    pop     di
+%endif
+    pop     ds
+    pop     es
+    iret
+
+
 ;--------------------------------------------------------------------
 ; Scans key presses and draws any hotkey changes.
@@ -33 +98 @@
 ;       AX, CX, DX, SI, DI
 ;--------------------------------------------------------------------
-HotkeyBar_UpdateDuringDriveDetection:
+UpdateDuringDriveDetection:
     call    ScanHotkeysFromKeyBufferAndStoreToBootvars
+
+    ; If ESC pressed, abort detection by forcing timeout
+    cmp     al, ESC_SCANCODE
+    jne     SHORT .ContinueDrawing
+    mov     BYTE [RAMVARS.bTimeoutTicksLeft], 0
+.ContinueDrawing:
+    
     ; Fall to HotkeyBar_DrawToTopOfScreen
 
@@ -78 +150 @@
     ; Clear CH if floppy drive is selected for boot
     mov     ch, [es:BOOTVARS.hotkeyVars+HOTKEYVARS.bFlags]
-;   and     ch, FLG_HOTKEY_HD_FIRST     ; Needed if more flags are added
+    and     ch, FLG_HOTKEY_HD_FIRST
     call    FormatDriveHotkeyString
 
@@ -97 +169 @@
     mov     ah, ANGLE_QUOTE_RIGHT
     mov     cx, [es:BOOTVARS.hotkeyVars+HOTKEYVARS.wHddLetterAndFlags]  ; Letter to CL, flags to CH
-;   and     ch, FLG_HOTKEY_HD_FIRST     ; Needed if more flags are added
+    and     ch, FLG_HOTKEY_HD_FIRST
     xor     ch, FLG_HOTKEY_HD_FIRST     ; Clear CH if HD is selected for boot, set otherwise
     mov     di, g_szHDD
@@ -332 +404 @@
 
 ;--------------------------------------------------------------------
+; HotkeyBar_StoreDefaultDriveLettersToHotkeyVars
+;   Parameters:
+;       ES:     BDA Segment
+;   Returns:
+;       Nothing
+;   Corrupts registers:
+;       AX
+;--------------------------------------------------------------------
+HotkeyBar_StoreDefaultDriveLettersToHotkeyVars:
+    call    BootVars_GetLetterForFirstHardDriveToAX
+    mov     ah, DEFAULT_FLOPPY_DRIVE_LETTER
+    xchg    al, ah
+    mov     [es:BOOTVARS.hotkeyVars+HOTKEYVARS.wFddAndHddLetters], ax
+    ret
+
+
+;--------------------------------------------------------------------
+; HotkeyBar_InitializeVariables
+;   Parameters:
+;       DS:     RAMVARS Segment
+;       ES:     BDA Segment
+;   Returns:
+;       Nothing
+;   Corrupts registers:
+;       AX, CX, DX, DI
+;--------------------------------------------------------------------
+HotkeyBar_InitializeVariables:
+    push    ds
+    push    es
+    pop     ds
+
+    ; Store system 1Ch Timer Tick handler and install our hotkeybar handler
+    mov     ax, [SYSTEM_TIMER_TICK*4]
+    mov     [BOOTVARS.hotkeyVars+HOTKEYVARS.fpPrevTimerHandler], ax
+    mov     ax, [SYSTEM_TIMER_TICK*4+2]
+    mov     [BOOTVARS.hotkeyVars+HOTKEYVARS.fpPrevTimerHandler+2], ax
+    mov     al, SYSTEM_TIMER_TICK
+    mov     si, HotkeyBar_TimerTickHandler
+    call    Interrupts_InstallHandlerToVectorInALFromCSSI
+
+    ; Store time when hotkeybar is displayed
+    ; (it will be displayed after initialization is complete)
+    call    TimerTicks_ReadFromBdaToAX
+    mov     [BOOTVARS.hotkeyVars+HOTKEYVARS.wTimeWhenDisplayed], ax
+
+    pop     ds
+
+    ; Initialize HOTKEYVARS by storing default drives to boot from
+    call    HotkeyBar_StoreDefaultDriveLettersToHotkeyVars
+    mov     dl, [cs:ROMVARS.bBootDrv]
+    ; Fall to HotkeyBar_StoreHotkeyToBootvarsForDriveNumberInDL
+
+
+;--------------------------------------------------------------------
 ; HotkeyBar_StoreHotkeyToBootvarsForDriveNumberInDL
 ;   Parameters: