Changeset 126 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src

Timestamp:

Mar 3, 2011, 6:33:01 PM (14 years ago)

Author:

krille_n_@…

google:author:

krille_n_@hotmail.com

Message:

Changes to the XTIDE Universal BIOS:

• Minor size optimization in DriveXlate.asm

File:

• trunk/XTIDE_Universal_BIOS/Src/Initialization/DriveXlate.asm (modified) (2 diffs)

trunk/XTIDE_Universal_BIOS/Src/Initialization/DriveXlate.asm

@@ -95 +95 @@
 ALIGN JUMP_ALIGN
 DriveXlate_SwapFloppyDriveOrHardDisk:
-    test    dl, 80h                         ; Hard disk?
-    jnz     SHORT .SwapHardDisk ; If so, jump to swap
-    ; Fall to .SwapFloppyDrive
-
-;--------------------------------------------------------------------
-; .SwapFloppyDrive
-;   Parameters:
-;       DL:     Drive number to be possibly swapped
-;       DS:     RAMVARS segment
-;   Returns:
-;       DL:     Translated drive number
-;   Corrupts registers:
-;       AX
-;--------------------------------------------------------------------
-.SwapFloppyDrive:
-    eMOVZX  ax, BYTE [RAMVARS.xlateVars+XLATEVARS.bFDSwap]
-    jmp     SHORT SwapDrive
-
-;--------------------------------------------------------------------
-; .SwapHardDisk
-;   Parameters:
-;       DL:     Drive number to be possibly swapped
-;       DS:     RAMVARS segment
-;   Returns:
-;       DL:     Translated drive number
-;   Corrupts registers:
-;       AX
-;--------------------------------------------------------------------
-ALIGN JUMP_ALIGN
-.SwapHardDisk:
-    mov     ah, 80h
+    mov     ah, 80h                 ; Assume hard disk
     mov     al, BYTE [RAMVARS.xlateVars+XLATEVARS.bHDSwap]
+    test    dl, ah                  ; Hard disk?
+    jnz     SHORT SwapDrive         ; If so, jump to swap
+    mov     al, BYTE [RAMVARS.xlateVars+XLATEVARS.bFDSwap]
+    cbw
     ; Fall to SwapDrive
 
@@ -140 +114 @@
 ;       Nothing
 ;--------------------------------------------------------------------
+ALIGN JUMP_ALIGN
 SwapDrive:
     cmp     ah, dl              ; Swap DL from 00h/80h to xxh?