Changeset 230 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/EBIOS/AH48h_GetExtendedDriveParameters.asm

Timestamp:

Jan 29, 2012, 11:22:19 PM (12 years ago)

Author:

krille_n_@…

google:author:

krille_n_@hotmail.com

Message:

Changes to XTIDE Universal BIOS:

• Some small optimizations

File:

• trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/EBIOS/AH48h_GetExtendedDriveParameters.asm (modified) (1 diff)

trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/EBIOS/AH48h_GetExtendedDriveParameters.asm

@@ -45 +45 @@
     mov     WORD [si+EDRIVE_INFO.wFlags], FLG_DMA_BOUNDARY_ERRORS_HANDLED_BY_BIOS
 
+    push    ds  ; Move CS to DS to avoid segment overrides
+    push    cs
+    pop     ds
+
     ; Limit LBA if necessary
-    test    BYTE [cs:di+DRVPARAMS.wFlags], FLG_DRVPARAMS_USERLBA
+    test    BYTE [di+DRVPARAMS.wFlags], FLG_DRVPARAMS_USERLBA
     jz      SHORT .StoreTotalSectorsFromBXDXAX
     test    bx, bx
     jnz     SHORT .LimitTotalSectors
-    cmp     dx, [cs:di+DRVPARAMS.dwMaximumLBA+2]
+    cmp     dx, [di+DRVPARAMS.dwMaximumLBA+2]
     jb      SHORT .StoreTotalSectorsFromBXDXAX      ; Real size less than max
     ja      SHORT .LimitTotalSectors
-    cmp     ax, [cs:di+DRVPARAMS.dwMaximumLBA]
+    cmp     ax, [di+DRVPARAMS.dwMaximumLBA]
     jbe     SHORT .StoreTotalSectorsFromBXDXAX      ; Real size less than max
 
 .LimitTotalSectors:
     xor     bx, bx
-    mov     ax, [cs:di+DRVPARAMS.dwMaximumLBA]
-    mov     dx, [cs:di+DRVPARAMS.dwMaximumLBA+2]
+    mov     ax, [di+DRVPARAMS.dwMaximumLBA]
+    mov     dx, [di+DRVPARAMS.dwMaximumLBA+2]
 
 .StoreTotalSectorsFromBXDXAX:
+    pop     ds  ; Restore DS from the change above
     mov     [si+EDRIVE_INFO.qwTotalSectors], ax
     xor     ax, ax                                  ; Return with success