Changeset 345 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS_Configurator_v2/Src/Menupages

Timestamp:

Mar 14, 2012, 7:01:44 PM (13 years ago)

Author:

aitotat@…

google:author:

aitotat@gmail.com

Message:

Changes to Configurator v2:

• Modified copyright string (now included XTIDE Universal BIOS Team).
• User inputted LBA is now decremented by one since LBA 28 limit is 0FFF FFFFh.

File:

• trunk/XTIDE_Universal_BIOS_Configurator_v2/Src/Menupages/MasterSlaveMenu.asm (modified) (2 diffs)

trunk/XTIDE_Universal_BIOS_Configurator_v2/Src/Menupages/MasterSlaveMenu.asm

@@ -345 +345 @@
 ALIGN JUMP_ALIGN
 ValueReaderForUserLbaValue:
-    mov     ax, [es:di+2]       ; SHR 16
-    eSHIFT_IM ax, 4, shr        ; SHR 16 + 4 = 20
+    push    dx
+
+    mov     ax, [es:di]
+    mov     dx, [es:di+2]       ; DX:AX now holds user defined LBA28 limit
+    add     ax, BYTE 1          ; Increment by one
+    adc     dx, BYTE 0
+
+    xchg    ax, dx              ; SHR 16
+    eSHIFT_IM ax, 4, shr        ; SHR 4 => AX = DX:AX / (1024*1024)
+
+    pop     dx
     ret
 
@@ -363 +372 @@
 ALIGN JUMP_ALIGN
 ValueWriterForUserLbaValue:
+    push    dx
+
+    xor     dx, dx
     eSHIFT_IM ax, 4, shl
-    mov     [es:di+2], ax
-    xor     ax, ax      ; Store zero to [es:di]
-    ret
+    xchg    dx, ax          ; DX:AX now holds AX * 1024 * 1024
+
+    sub     ax, BYTE 1      ; Decrement DX:AX by one
+    sbb     dx, BYTE 0      ; (necessary since maximum LBA28 sector count is 0FFF FFFFh)
+
+    mov     [es:di+2], dx   ; Store DX by ourselves
+    pop     dx
+    ret                     ; AX will be stored by our menu system