Changeset 322 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/Initialization

Timestamp:

Mar 11, 2012, 4:17:46 PM (13 years ago)

Author:

krille_n_@…

google:author:

krille_n_@hotmail.com

Message:

Changes to XTIDE Universal BIOS:

• Commented out the FS and GS segment registers from INTPACK since we never touch them anyway.
• Minor changes to improve speed in the Int13h handler.
• Changed Prepare_ByValidatingSectorsInALforOldInt13h so it really doesn't corrupt anything.
• Changed the makefile so 'make strings' now works even if StringsCompressed.asm is missing or empty.

File:

• trunk/XTIDE_Universal_BIOS/Src/Initialization/DriveXlate.asm (modified) (1 diff)

trunk/XTIDE_Universal_BIOS/Src/Initialization/DriveXlate.asm

@@ -20 +20 @@
     jz      SHORT .Return           ; Return if translation disabled
     xchg    di, ax                  ; Backup AX
-    call    SwapFloppyDriveOrHardDisk
-    xchg    ax, di
-.Return:
-    ret
 
-
-;--------------------------------------------------------------------
-; SwapFloppyDriveOrHardDisk
-;   Parameters:
-;       DL:     Drive number to be possibly swapped
-;       DS:     RAMVARS segment
-;   Returns:
-;       DL:     Translated drive number
-;   Corrupts registers:
-;       AX
-;--------------------------------------------------------------------
-ALIGN JUMP_ALIGN
-SwapFloppyDriveOrHardDisk:
     mov     ah, 80h                 ; Assume hard disk
     mov     al, [RAMVARS.xlateVars+XLATEVARS.bHDSwap]
     test    dl, ah                  ; Hard disk?
-    jnz     SHORT SwapDrive         ; If so, jump to swap
+    jnz     SHORT .SwapDrive        ; If so, jump to swap
     mov     al, [RAMVARS.xlateVars+XLATEVARS.bFDSwap]
     cbw
-    ; Fall to SwapDrive
 
-;--------------------------------------------------------------------
-; SwapDrive
-;   Parameters:
-;       AL:     Drive number to swap to 00h/80h
-;       AH:     00h/80h to be swapped to stored drive number
-;       DL:     Drive number to be possibly swapped
-;   Returns:
-;       DL:     Translated drive number
-;   Corrupts registers:
-;       AL
-;--------------------------------------------------------------------
 ALIGN JUMP_ALIGN
-SwapDrive:
-    cmp     ah, dl              ; Swap DL from 00h/80h to xxh?
+.SwapDrive:
+    cmp     ah, dl                  ; Swap DL from 00h/80h to xxh?
     je      SHORT .SwapToXXhInAL
-    cmp     al, dl              ; Swap DL from xxh to 00h/80h?
-    jne     SHORT .Return
+    cmp     al, dl                  ; Swap DL from xxh to 00h/80h?
+    jne     SHORT .RestoreAXandReturn
     mov     al, ah
 ALIGN JUMP_ALIGN
 .SwapToXXhInAL:
     mov     dl, al
+ALIGN JUMP_ALIGN
+.RestoreAXandReturn:
+    xchg    ax, di                  ; Restore AX
 ALIGN JUMP_ALIGN, ret
 .Return: