Changeset 550 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/Menus/DriveXlate.asm

Timestamp:

Apr 27, 2013, 5:30:50 PM (11 years ago)

Author:

aitotat@…

google:author:

aitotat@gmail.com

Message:

Changes to XTIDE Universal BIOS:

• CREATE_COMPATIBLE_DPT is now MODULE_COMPATIBLE_TABLES.
• DPTs pointed by INT 41h and INT 46h are now swapped when swapping drives 81h and 80h.
• Block mode commands are no longer used when block size is set to 1 with AH=24h.

File:

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

trunk/XTIDE_Universal_BIOS/Src/Menus/DriveXlate.asm

@@ -96 +96 @@
     test    dl, ah                  ; Hard disk?
     jnz     SHORT .SwapDrive        ; If so, jump to swap
+
     mov     al, [RAMVARS.xlateVars+XLATEVARS.bFDSwap]
     cbw
@@ -106 +107 @@
     jne     SHORT .RestoreAXandReturn
     mov     al, ah
+
 ALIGN JUMP_ALIGN
 .SwapToXXhInAL:
     mov     dl, al
+
+%ifdef MODULE_COMPATIBLE_TABLES
+    cmp     al, 81h
+    jne     SHORT .RestoreAXandReturn
+
+    ; Since swapping drive 80h <=> 81h, we need to swap
+    ; DPT pointers in interrupt vectors 41h and 46h.
+    push    ds
+    LOAD_BDA_SEGMENT_TO ds, ax
+    mov     ax, [HD0_DPT_POINTER_41h*4]
+    xchg    [HD1_DPT_POINTER_46h*4], ax
+    mov     [HD0_DPT_POINTER_41h*4], ax
+    mov     ax, [HD0_DPT_POINTER_41h*4+2]
+    xchg    [HD1_DPT_POINTER_46h*4+2], ax
+    mov     [HD0_DPT_POINTER_41h*4+2], ax
+    pop     ds
+%endif ; MODULE_COMPATIBLE_TABLES
+
 ALIGN JUMP_ALIGN
 .RestoreAXandReturn: