Changeset 174 in xtideuniversalbios

Timestamp:

Sep 18, 2011, 10:51:12 PM (13 years ago)

Author:

krille_n_@…

google:author:

krille_n_@hotmail.com

Message:

Changes to XTIDE Universal BIOS:

• Excluded the Math_DivDXAXbyCX procedure as it is currently unused. Also made it 2 bytes smaller.

Location:

trunk

Files:

• Assembly_Library/Src/Util/Math.asm (modified) (3 diffs)
• XTIDE_Universal_BIOS/Src/Initialization/AtaID.asm (modified) (2 diffs)

trunk/Assembly_Library/Src/Util/Math.asm

@@ -18 +18 @@
 ;--------------------------------------------------------------------
 ALIGN JUMP_ALIGN
-Math_DivQWatSSBPbyCX:
+Math_DivQWatSSBPbyCX:       ; This procedure is included but not used in XTIDECFG
     xor     dx, dx
     mov     ax, [bp+6]      ; Load highest divident WORD to DX:AX
@@ -49 +49 @@
 ;       Nothing
 ;--------------------------------------------------------------------
+%ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS
 ALIGN JUMP_ALIGN
-Math_DivDXAXbyCX:
-    mov     bx, ax
-    mov     ax, dx
-    xor     dx, dx
+Math_DivDXAXbyCX:           ; This procedure is included but not used in XTIDECFG
+    xor     bx, bx
+    xchg    bx, ax
+    xchg    dx, ax
     div     cx
     xchg    ax, bx
@@ -59 +60 @@
     xchg    dx, bx
     ret
+%endif

trunk/XTIDE_Universal_BIOS/Src/Initialization/AtaID.asm

@@ -10 +10 @@
 ; this is how to fit a big drive into INT13's skimpy size requirements,
 ; with a maximum of 8.4G available.
-; 
-; total LBAs (as obtained by words 60+61) 
+;
+; total LBAs (as obtained by words 60+61)
 ; divided by 63 (sectors per track) (save as value A)
 ; Sub 1 from A
-; divide A by 1024 + truncate. 
+; divide A by 1024 + truncate.
 ; == total number of heads to use.
 ; add 1
 ; this value must be either 16, 32, 64, 128, or 256 (round up)
 ; then take the value A above and divide by # of heads
-; to get the # of cylinders to use.  
+; to get the # of cylinders to use.
 ;
 ;
 ; so a LBA28 drive will have 268,435,456 as maximum LBAs
-; 
+;
 ; 10000000h / 63   = 410410h (total cylinders or tracks)
 ;   410410h / 1024 = 1041h, which is way more than 256 heads, but 256 is max.
@@ -35 +35 @@
 ; anyway, so there's no need to use the 48bit LBA values.
 ;
-; AtaID_GetLbaAssistedCHStoAXBLBH:
+; AtaID_GetLbaAssistedCHStoDXAXBLBH:
 ;   Parameters:
 ;       BX:DX:AX:   Total number of sectors