Changeset 227 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AH15h_HSize.asm

Timestamp:

Jan 29, 2012, 1:33:44 PM (12 years ago)

Author:

aitotat@…

google:author:

aitotat@gmail.com

Message:

Changes to XTIDE Universal BIOS:

• EBIOS functions now work in lite mode.

File:

• trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AH15h_HSize.asm (modified) (2 diffs)

trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AH15h_HSize.asm

@@ -53 +53 @@
     jmp     SHORT ConvertAH08hReturnValuesToSectorCount
 
-ALIGN JUMP_ALIGN
 AH15h_GetSectorCountToDXAX:
     call    AH8h_GetDriveParameters
@@ -60 +59 @@
 ConvertAH08hReturnValuesToSectorCount:
     call    Address_ExtractLCHSparametersFromOldInt13hAddress
-    xor     ax, ax          ; Zero AX
-    inc     cx              ; Max cylinder number to cylinder count
-    xchg    al, bh          ; AX=Max head number, BX=Sectors per track
-    inc     ax              ; AX=Head count
-    mul     bx              ; AX=Head count * Sectors per track
-    mul     cx              ; DX:AX = Total sector count
-    xor     bx, bx          ; Zero BX for 48-bit sector count (and clear CF)
+    xchg    ax, cx
+    inc     ax              ; Max cylinder number to cylinder count
+.MultiplyChsInAXBLBHtoBXDXAX:
+    xchg    bx, ax
+    mul     ah          ; Multiply heads and sectors
+    mul     bx          ; Multiply with cylinders
+    xor     bx, bx
     ret