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

Timestamp:

Mar 4, 2012, 1:35:10 AM (13 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/Address.asm (modified) (2 diffs)

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

@@ -128 +128 @@
 ConvertLCHStoLBARegisterValues:
     ; cylToSeek*headsPerCyl (18-bit result)
-    mov     ax, cx                  ; Copy Cylinder number to AX
-    ; We could save a byte here by using CWD instead of the XOR DH, DH in eMOVZX
-    ; but I'm not sure how that would affect speed.
+    mov     ax, LBA_ASSIST_SPT      ; Load Sectors per Track
+    xchg    cx, ax                  ; Cylinder number to AX, Sectors per Track to CX
 
-    eMOVZX  dx, BYTE [di+DPT.bLbaHeads]
+%ifdef USE_386
+    movzx   dx, [di+DPT.bLbaHeads]
+%else
+    cwd
+    mov     dl, [di+DPT.bLbaHeads]
+%endif
     mul     dx                      ; DX:AX = cylToSeek*headsPerCyl
 
@@ -141 +145 @@
 
     ; *=sectPerTrack (18-bit by 6-bit multiplication with 24-bit result)
-    mov     cx, LBA_ASSIST_SPT      ; Load Sectors per Track
     xchg    ax, dx                  ; Hiword to AX, loword to DX
     mul     cl                      ; AX = hiword * Sectors per Track