Changeset 269 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS

Timestamp:

Feb 27, 2012, 2:58:34 PM (13 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.

Location:

trunk/XTIDE_Universal_BIOS/Src

Files:

• Boot/BootMenuInfo.asm (modified) (2 diffs)
• Handlers/Int13h/AH0h_HReset.asm (modified) (1 diff)
• Initialization/DetectDrives.asm (modified) (2 diffs)

trunk/XTIDE_Universal_BIOS/Src/Boot/BootMenuInfo.asm

@@ -21 +21 @@
 BootMenuInfo_CreateForHardDisk:
     call    BootMenuInfo_ConvertDPTtoBX         ; ES:BX now points to new BOOTMENUINFO
-    push    bx                                  ; Preserve for return
-
-    mov     di, bx                              ; Starting pointer at beginning of structure
 
     ; Store Drive Name
@@ -45 +42 @@
     pop     si
     pop     ds
-    pop     bx
         
     ret

trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AH0h_HReset.asm

@@ -148 +148 @@
     mov     dl, ROMVARS.ideVars0                        ; starting Idevars offset
 
-    mov     cl, [cs:ROMVARS.bIdeCnt]                    ; get count of ide controllers
-    mov     ch, 0
+    call    RamVars_GetIdeControllerCountToCX
     jcxz    .done                                       ; just in case bIdeCnt is zero (shouldn't be)
 

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: