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

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.

Location:

trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/Tools

Files:

• Address.asm (modified) (2 diffs)
• Prepare.asm (modified) (1 diff)

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

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