Changeset 158 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/Device/IDE/IdeTransfer.asm

Timestamp:

May 2, 2011, 9:41:51 AM (13 years ago)

Author:

aitotat

google:author:

aitotat

Message:

Changes to XTIDE Universal BIOS:

• Optimized few bytes.

File:

• trunk/XTIDE_Universal_BIOS/Src/Device/IDE/IdeTransfer.asm (modified) (3 diffs)

trunk/XTIDE_Universal_BIOS/Src/Device/IDE/IdeTransfer.asm

@@ -166 +166 @@
 ; InitializePiovarsInSSBPwithSectorCountInAX
 ;   Parameters:
-;       AX:     Number of sectors to transfer (0=65536)
+;       AX:     Number of sectors to transfer (1...65535)
 ;       BX:     Offset to transfer function lookup table
 ;       DS:DI:  Ptr to DPT (in RAMVARS segment)
@@ -179 +179 @@
     ; Store number of blocks to transfer
     eMOVZX  cx, BYTE [di+DPT_ATA.bSetBlock]     ; Block size in sectors
-    xor     dx, dx
-    test    ax, ax
-    eCMOVZ  dl, 1       ; DX:AX = Sectors to transfer (1...65536)
+    xor     dx, dx      ; DX:AX = Sectors to transfer (1...65535)
     div     cx          ; AX = Full blocks to transfer
     test    dx, dx
@@ -197 +195 @@
 
     ; Get transfer function based on bus type
-    xchg    ax, bx
+    xchg    ax, bx                              ; Lookup table offset to AX
     eMOVZX  bx, BYTE [di+DPT.bIdevarsOffset]    ; CS:BX now points to IDEVARS
     mov     dx, [cs:bx+IDEVARS.wPort]           ; Load IDE Data port address