Changeset 294 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/Tools/Prepare.asm

Timestamp:

Mar 4, 2012, 1:35:10 AM (12 years ago)

Author:

krille_n_@…

google:author:

krille_n_@hotmail.com

Message:

Commit 2/2 (BIOS):

• Fixed a bug in AH1h_HStatus.asm.
• Minor optimizations.
• Fixed spelling and did some cleaning.

File:

• trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/Tools/Prepare.asm (modified) (1 diff)

trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/Tools/Prepare.asm

@@ -34 +34 @@
     cmp     ax, BYTE 127
     ja      SHORT InvalidNumberOfSectorsRequested
-    ; Fall to GetEbiosCommandIndexToBX
 
-;--------------------------------------------------------------------
-; GetEbiosCommandIndexToBX
-;   Parameters:
-;       DS:DI:  Ptr to DPT
-;       ES:SI:  Ptr to DAP (Disk Address Packet)
-;   Returns:
-;       BX:     Index to command lookup table
-;   Corrupts registers:
-;       AX, DX
-;--------------------------------------------------------------------
-GetEbiosCommandIndexToBX:
+    ; Get EBIOS command index to BX
     ; LBA28 or LBA48 command
-    xor     dx, dx
+    cwd
     mov     al, [es:si+DAP.qwLBA+3] ; Load LBA48 byte 3 (bits 24...31)
-    and     ax, 00F0h               ; Clear LBA28 bits 24...27
+    and     al, 0F0h                ; Clear LBA28 bits 24...27
     or      ax, [es:si+DAP.qwLBA+4] ; Set bits from LBA bytes 4 and 5
     cmp     dx, ax                  ; Set CF if any of bits 28...47 set