Changeset 269 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/Initialization

Timestamp:

Feb 27, 2012, 2:58:34 PM (12 years ago)

Author:

gregli@…

google:author:

gregli@hotmail.com

Message:

Fixed a bug with reporting the number of hard disks when there were only foreign disks (none managed by this bios). Also a few small optimizations.

File:

• trunk/XTIDE_Universal_BIOS/Src/Initialization/DetectDrives.asm (modified) (2 diffs)

trunk/XTIDE_Universal_BIOS/Src/Initialization/DetectDrives.asm

@@ -63 +63 @@
 ; Add in hard disks to BDA, finalize our Count and First variables
 ;
+; Note that we perform the add to bHDCount and store bFirstDrv even if the count is zero.
+; This is done because we use the value of .bFirstDrv to know how many drives were in the system
+; at the time of boot, and to return that number on int13h/8h calls.  Because the count is zero,
+; FindDPT_ForDriveNumber will not find any drives that are ours.
+;
     mov     cx, [RAMVARS.wDrvCntAndFlopCnt]     ; Our count of hard disks
-    test    cl, cl
-    jz      .AddFloppies                ; If none, nothing more to do
 
     mov     al, [es:BDA.bHDCount]
@@ -72 +75 @@
     or      al, 80h                     ; Or in hard disk flag      
     mov     [RAMVARS.bFirstDrv], al     ; Store first drive number      
-
 
 .AddFloppies: