Changeset 521 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/VariablesAndDPTs/FindDPT.asm

Timestamp:

Mar 10, 2013, 3:46:59 PM (11 years ago)

Author:

aitotat@…

google:author:

aitotat@gmail.com

Message:

Changes to XTIDE Universal BIOS:

• Hopefully fixed problems with recent changes to AH=00h.
• Timeout error code is no longer displayed when trying to boot from floppy drive.

File:

• trunk/XTIDE_Universal_BIOS/Src/VariablesAndDPTs/FindDPT.asm (modified) (4 diffs)

trunk/XTIDE_Universal_BIOS/Src/VariablesAndDPTs/FindDPT.asm

@@ -136 +136 @@
 
 ;--------------------------------------------------------------------
-; FindDPT_ForIdevarsOffsetInDL
+; FindDPT_MasterOrSingleForIdevarsOffsetInDL
 ;   Parameters:
 ;       DL:     Offset to IDEVARS to search for
@@ -147 +147 @@
 ;       SI
 ;--------------------------------------------------------------------
-FindDPT_ForIdevarsOffsetInDL:
+FindDPT_MasterOrSingleForIdevarsOffsetInDL:
     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
+; FindDPT_SlaveForIdevarsOffsetInDL
+;   Parameters:
+;       DL:     Offset to IDEVARS to search for
+;       DS:     RAMVARS segment
+;   Returns:
+;       DS:DI:      Ptr to second 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_SlaveForIdevarsOffsetInDL:
+    mov     si, IterateFindSecondDPTforIdevars          ; iteration routine (see below)
+    jmp     SHORT FindDPT_IterateAllDPTs                ; look for the second drive on this controller, if any
+
+;--------------------------------------------------------------------
+; Iteration routines for FindDPT_MasterOrSingleForIdevarsOffsetInDL and
+; FindDPT_SlaveForIdevarsOffsetInDL, for use with IterateAllDPTs
 ;
 ; Returns when DPT is found on the controller with Idevars offset in DL
 ;
+; IterateFindSecondDPTforIdevars
 ; IterateFindFirstDPTforIdevars
 ;       DL:     Offset to IDEVARS to search from DPTs
@@ -164 +181 @@
 ;               Set if wrong DPT
 ;--------------------------------------------------------------------
+IterateFindSecondDPTforIdevars:
+    call    IterateFindFirstDPTforIdevars
+    jc      SHORT IterateFindFirstDPTforIdevars.done    ; Wrong controller
+
+    ; We have found DPT for Master Drive,
+    ; next DPT is for slave drive or master for another controller
+    add     di, BYTE LARGEST_DPT_SIZE
+    ; Fall to IterateFindFirstDPTforIdevars
+
 IterateFindFirstDPTforIdevars:
     cmp     dl, [di+DPT.bIdevarsOffset]         ; Clears CF if matched
@@ -293 +319 @@
     pop     cx
     ret
-