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Handlers

Timestamp:

Apr 21, 2013, 3:47:11 PM (12 years ago)

Author:

aitotat@…

google:author:

aitotat@gmail.com

Message:

Changes to XTIDE Universal BIOS:

Hotkeys were incorrectly initialized to use 'C' as first hard drive letter.
All CHS translate modes should again work (incorrectly decremented DX instead of DL, it might or might not have caused problems).

Location:

trunk/XTIDE_Universal_BIOS/Src/Handlers

Files:

-              r526
+              r547
 ;--------------------------------------------------------------------
 ; Int 13h function AH=15h, Read Disk Drive Size.
+;
+; It is unclear what is the total number of sectors to return.
+; Award BIOS from 1997 returns full capacity instead of L-CHS limit
+; like we do. I think it makes more sense if this function returns
+; L-CHS limit.
+;
 ; AH15h_HandlerForReadDiskDriveSize

-              r526
+              r547
     ; Make sure that sector count is valid
+    mov     al, [es:si+DAP.wSectorCount]
+    test    al, al
+    jz      SHORT ZeroSectorsRequestedSoNoErrors
+    js      SHORT InvalidNumberOfSectorsRequested
+%if 0   ; Slow version in the unlikely case that high byte needs to be checked.
     mov     ax, [es:si+DAP.wSectorCount]
     test    ax, ax
 …
     cmp     ax, BYTE 127
     ja      SHORT InvalidNumberOfSectorsRequested
+%endif
     ; Get EBIOS command index to BX
 …
     call    Prepare_GetOldInt13hCommandIndexToBX
     mov     al, [di+DPT.bFlagsLow]
     eSHL_IM al, 1                   ; Set CF if LBA48 supported
+    shl     al, 1                   ; Set CF if LBA48 supported
     adc     bl, bh                  ; LBA48 EXT commands
     ret

-              r529
+              r547
 %ifdef MODULE_HOTKEYS
+    ; Last hard drive might have scrolled Hotkey Bar out of screen.
+    ; We want to display it during wait.
+    call    HotkeyBar_UpdateDuringDriveDetection
 .WaitUntilTimeToCloseHotkeyBar:
     call    TimerTicks_ReadFromBdaToAX

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