Changeset 271 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/VariablesAndDPTs

Timestamp:

Feb 27, 2012, 4:24:52 PM (13 years ago)

Author:

aitotat@…

google:author:

aitotat@gmail.com

Message:

Changes to XTIDE Universal BIOS:

• AH=0h (Reset) should now work but our drives are no longer reset if DL belongs to foreign drive.

File:

• trunk/XTIDE_Universal_BIOS/Src/VariablesAndDPTs/FindDPT.asm (modified) (3 diffs)

trunk/XTIDE_Universal_BIOS/Src/VariablesAndDPTs/FindDPT.asm

@@ -116 +116 @@
     ret
 
+
+;--------------------------------------------------------------------
+; FindDPT_ForIdevarsOffsetInDL
+;   Parameters:
+;       DL:     Offset to IDEVARS to search for
+;       DS:     RAMVARS segment
+;   Returns:
+;       DS:DI:      Ptr to first DPT with same IDEVARS as in DL
+;       CF:         Clear if wanted DPT found
+;                   Set if DPT not found, or no DPTs present
+;   Corrupts registers:
+;       SI
+;--------------------------------------------------------------------
+FindDPT_ForIdevarsOffsetInDL:
+    mov     si, IterateFindFirstDPTforIdevars           ; iteration routine (see below)
+    jmp     SHORT FindDPT_IterateAllDPTs                ; look for the first drive on this controller, if any
+
+;--------------------------------------------------------------------
+; Iteration routine for FindDPT_ForIdevarsOffsetInDL, 
+; for use with IterateAllDPTs
+; 
+; Returns when DPT is found on the controller with Idevars offset in DL
+;
+; IterateFindFirstDPTforIdevars
+;       DL:     Offset to IDEVARS to search from DPTs
+;       DS:DI:  Ptr to DPT to examine
+;   Returns:
+;       CF:     Clear if wanted DPT found
+;               Set if wrong DPT
+;--------------------------------------------------------------------
+IterateFindFirstDPTforIdevars:      
+    cmp     dl, [di+DPT.bIdevarsOffset]         ; Clears CF if matched
+    je      .done
+    stc                                         ; Set CF for not found
+.done:  
+    ret
+
+
 ;--------------------------------------------------------------------
 ; Finds pointer to first unused Disk Parameter Table.
@@ -198 +236 @@
 ; Iterates all Disk Parameter Tables.
 ;
-; IterateAllDPTs
+; FindDPT_IterateAllDPTs
 ;   Parameters:
 ;       AX,BX,DX:   Parameters to callback function
@@ -213 +251 @@
 ;--------------------------------------------------------------------
 ALIGN JUMP_ALIGN
-IterateAllDPTs:
+FindDPT_IterateAllDPTs:
     push    cx