Changeset 531 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS

Timestamp:

Mar 30, 2013, 6:50:48 PM (12 years ago)

Author:

krille_n_@…

google:author:

krille_n_@hotmail.com

Message:

Changes:

• A few minor optimizations.

Location:

trunk/XTIDE_Universal_BIOS/Src

Files:

• Initialization/FloppyDrive.asm (modified) (4 diffs)
• VariablesAndDPTs/RamVars.asm (modified) (1 diff)

trunk/XTIDE_Universal_BIOS/Src/Initialization/FloppyDrive.asm

@@ -64 +64 @@
 
 %else ; if XT build
-    cmp     WORD [es:BIOS_DISKETTE_INTERRUPT_40h*4+2], 0C000h   ; Any ROM segment? (set CF if not)
+    cmp     BYTE [es:BIOS_DISKETTE_INTERRUPT_40h*4+3], 0C0h ; Any ROM segment? (set CF if not)
 %endif ; USE_AT
     cmc
@@ -134 +134 @@
     js      .UseBIOSorBDA               ; We didn't add in any drives, counts here are not valid
 
-    adc     al ,1                       ; adds in the drive count bit, and adds 1 for count vs. 0-index,
+    adc     al, 1                       ; adds in the drive count bit, and adds 1 for count vs. 0-index,
     jmp     .FinishCalc                 ; need to clear AH on the way out, and add in minimum drive numbers
 
@@ -175 +175 @@
     cwd                             ; Floppy Drive 00h
     int     BIOS_DISKETTE_INTERRUPT_40h
-    mov     al, dl                  ; Number of Floppy Drives to AL
+    xchg    dx, ax                  ; Number of Floppy Drives to AL
 
     pop     dx
@@ -187 +187 @@
     LOAD_BDA_SEGMENT_TO es, ax
     mov     al, [es:BDA.wEquipment] ; Load Equipment WORD low byte
+
+%ifdef USE_UNDOC_INTEL
+    and     al, 0C1h
+    eAAM    64
+%else
     mov     ah, al                  ; Copy it to AH
     and     ax, 0C001h              ; Leave bits 15..14 and 0
     eROL_IM ah, 2                   ; EW low byte bits 7..6 to 1..0
+%endif ; USE_UNDOC_INTEL
+
     add     al, ah                  ; AL = Floppy Drive count
-%endif
+%endif ; USE_AT
 
     pop     es

trunk/XTIDE_Universal_BIOS/Src/VariablesAndDPTs/RamVars.asm

@@ -56 +56 @@
     mov     al, [cs:ROMVARS.bStealSize]
     sub     [BDA.wBaseMem], ax
-    mov     ax, [BDA.wBaseMem]
+    mov     ax, [BDA.wBaseMem]          ; We can save a byte here by using INT 12h instead
     eSHL_IM ax, 6                       ; Segment to first stolen kB (*=40h)
     ; Fall to .InitializeRamvars