Changeset 148 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/Initialization/DriveXlate.asm

Timestamp:

Mar 19, 2011, 8:09:41 PM (13 years ago)

Author:

aitotat

google:author:

aitotat

Message:

Changes to XTIDE Universal BIOS:

• INT 13h optimizations to save almost 100 bytes.

File:

• trunk/XTIDE_Universal_BIOS/Src/Initialization/DriveXlate.asm (modified) (6 diffs)

trunk/XTIDE_Universal_BIOS/Src/Initialization/DriveXlate.asm

@@ -6 +6 @@
 
 ;--------------------------------------------------------------------
-; Translates drive number when entering INT 13h.
-;
-; DriveXlate_WhenEnteringInt13h
-;   Parameters:
-;       DL:     Drive number to be possibly translated
-;       DS:     RAMVARS segment
-;   Returns:
-;       DL:     Translated drive number
-;   Corrupts registers:
-;       DI
-;--------------------------------------------------------------------
-ALIGN JUMP_ALIGN
-DriveXlate_WhenEnteringInt13h:
-    inc     BYTE [RAMVARS.xlateVars+XLATEVARS.bRecurCnt]
-    cmp     BYTE [RAMVARS.xlateVars+XLATEVARS.bRecurCnt], 1
-    je      SHORT DriveXlate_ToOrBack
-    ret
-
-
-;--------------------------------------------------------------------
-; DriveXlate_WhenLeavingInt13hWithReturnValueInDL
-;   Parameters:
-;       DS:     RAMVARS segment
-;   Returns:
-;       Nothing
-;   Corrupts registers:
-;       DI
-;--------------------------------------------------------------------
-ALIGN JUMP_ALIGN
-DriveXlate_WhenLeavingInt13hWithReturnValueInDL:
-    dec     BYTE [RAMVARS.xlateVars+XLATEVARS.bRecurCnt]
-    ret
-
-;--------------------------------------------------------------------
-; Translates drive number when leaving INT 13h.
-;
-; DriveXlate_WhenLeavingInt13h
-;   Parameters:
-;       DL:     Drive number to be possibly translated
-;       DS:     RAMVARS segment
-;   Returns:
-;       DL:     Translated drive number
-;   Corrupts registers:
-;       DI
-;--------------------------------------------------------------------
-ALIGN JUMP_ALIGN
-DriveXlate_WhenLeavingInt13h:
-    dec     BYTE [RAMVARS.xlateVars+XLATEVARS.bRecurCnt]
-    jz      SHORT DriveXlate_ToOrBack
-    ret
-
-
-;--------------------------------------------------------------------
-; Translates drive number to or back.
-;
 ; DriveXlate_ToOrBack
 ;   Parameters:
@@ -75 +20 @@
     jz      SHORT .Return           ; Return if translation disabled
     xchg    di, ax                  ; Backup AX
-    call    DriveXlate_SwapFloppyDriveOrHardDisk
+    call    SwapFloppyDriveOrHardDisk
     xchg    ax, di
 .Return:
@@ -82 +27 @@
 
 ;--------------------------------------------------------------------
-; Swaps Floppy Drive or Hard Disk number.
-;
-; DriveXlate_SwapFloppyDriveOrHardDisk
+; SwapFloppyDriveOrHardDisk
 ;   Parameters:
 ;       DL:     Drive number to be possibly swapped
@@ -94 +37 @@
 ;--------------------------------------------------------------------
 ALIGN JUMP_ALIGN
-DriveXlate_SwapFloppyDriveOrHardDisk:
+SwapFloppyDriveOrHardDisk:
     mov     ah, 80h                 ; Assume hard disk
     mov     al, BYTE [RAMVARS.xlateVars+XLATEVARS.bHDSwap]
@@ -145 +88 @@
 DriveXlate_Reset:
     mov     WORD [RAMVARS.xlateVars], 8000h ; .bFDSwap and .bHDSwap
-    mov     BYTE [RAMVARS.xlateVars+XLATEVARS.bRecurCnt], 0
     ret
 
@@ -172 +114 @@
     mov     [RAMVARS.xlateVars+XLATEVARS.bHDSwap], dl
     ret
-
-
-;--------------------------------------------------------------------
-; Checks if INT 13h function returns some value in DL
-; (other than the drive number that was also parameter).
-;
-; DriveXlate_DoesFunctionReturnSomethingInDL
-;   Parameters:
-;       AH:     INT 13h BIOS Function
-;       DL:     Drive number
-;   Returns:
-;       CF:     Set if something is returned in DL
-;               Cleared if only drive number parameter is returned in DL
-;   Corrupts registers:
-;       Nothing
-;--------------------------------------------------------------------
-ALIGN JUMP_ALIGN
-DriveXlate_DoesFunctionReturnSomethingInDL:
-    cmp     ah, 08h         ; AH=08h, Read Disk Drive Parameters?
-    je      SHORT DriveXlate_FunctionReturnsSomethingInDL
-    test    dl, dl
-    jns     SHORT DriveXlate_DoesFloppyFunctionReturnSomethingInDL
-    ; Fall to DriveXlate_DoesHardDiskFunctionReturnSomethingInDL
-
-;--------------------------------------------------------------------
-; Checks if INT 13h hard disk or floppy drive function returns some
-; value in DL other than the drive number that was also parameter).
-; Some functions return different values for hard disks and floppy drives.
-;
-; DriveXlate_DoesHardDiskFunctionReturnSomethingInDL
-; DriveXlate_DoesFloppyFunctionReturnSomethingInDL
-;   Parameters:
-;       AH:     INT 13h BIOS Function
-;       DL:     Hard Disk number
-;   Returns:
-;       CF:     Set if something is returned in DL
-;               Cleared if only drive number parameter is returned in DL
-;   Corrupts registers:
-;       Nothing
-;--------------------------------------------------------------------
-; ALIGN JUMP_ALIGN
-DriveXlate_DoesHardDiskFunctionReturnSomethingInDL:
-    cmp     ah, 15h         ; AH=15h, Read Disk Drive Size?
-    je      SHORT DriveXlate_FunctionReturnsSomethingInDL
-DriveXlate_DoesFloppyFunctionReturnSomethingInDL:
-    clc
-    ret
-
-ALIGN JUMP_ALIGN
-DriveXlate_FunctionReturnsSomethingInDL:
-    stc
-    ret