Changeset 262 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AH0h_HReset.asm

Timestamp:

Feb 24, 2012, 10:28:31 AM (13 years ago)

Author:

gregli@…

google:author:

gregli@hotmail.com

Message:

More optimizations. Merged RamVars_IsFunction/DriveHandledByThisBIOS in with FindDPT_ForDriveNumber, since they are often used together, making a returned NULL DI pointer indicate a foreign drive in many places. Revamped the iteration done in the handlers for int13/0dh and int13h/0h. Added serial specific print string during drive detection.

File:

• trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AH0h_HReset.asm (modified) (2 diffs)

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

@@ -121 +121 @@
 GetDriveNumberForForeignBiosesToDL:
     mov     dl, bl
-    call    RamVars_IsDriveHandledByThisBIOS
-    jc      SHORT .Return               ; Return what was in BL unmodified
+    test    di, di
+    jz      SHORT .Return               ; Return what was in BL unmodified
     mov     dl, 80h
 .Return:
@@ -141 +141 @@
 ALIGN JUMP_ALIGN
 AH0h_ResetHardDisksHandledByOurBIOS:
-    mov     dx, [RAMVARS.wDrvCntAndFirst]   ; DL = drive number, DH = drive count
-    test    dh, dh
-    jz      SHORT .AllDrivesReset       ; Return if no drives
-    add     dh, dl                      ; DH = one past last drive to reset
-ALIGN JUMP_ALIGN
-.DriveResetLoop:
-    call    AHDh_ResetDrive
-    call    .BackupErrorCodeFromMasterOrSlaveToBH
-    inc     dx
-    cmp     dl, dh                      ; All done?
-    jb      SHORT .DriveResetLoop       ;  If not, reset next drive
-.AllDrivesReset:
+    mov     bl, [di+DPT.bIdevarsOffset]                 ; replace drive number with Idevars pointer for comparisons
+    mov     cl, [cs:ROMVARS.bIdeCnt]                    ; get count of ide controllers
+    mov     ch, 0                                       
+    mov     dl, 0                                       ; starting Idevars offset
+    mov     si, IterateFindFirstDPTforIdevars           ; iteration routine
+.loop:
+    call    IterateAllDPTs                              ; look for the first drive on this controller, if any
+    jc      .notFound
+    call    AHDh_ResetDrive                             ; reset master and slave on that controller
+    call    BackupErrorCodeFromTheRequestedDriveToBH    ; save error code if same controller as initial request
+.notFound:
+    add     dl, IDEVARS_size                            ; move pointer forward
+    loop    .loop                                       ; and repeat
     ret
 
-                
 ;--------------------------------------------------------------------
-; .BackupErrorCodeFromMasterOrSlaveToBH
-;   Parameters:
-;       AH:     Error code for drive DL reset
-;       BL:     Requested drive (DL when entering AH=00h)
-;       DL:     Drive just resetted
-;       DS:     RAMVARS segment
-;   Returns:
-;       BH:     Backuped error code
-;       DL:     Incremented if next drive is slave drive
-;               (=already resetted)
-;   Corrupts registers:
-;       CX, DI
+; Iteration routine for AH0h_ResetHardDisksHandledByOurBIOS, 
+; for use with IterateAllDPTs
+; 
+; Returns when DPT is found on the controller with Idevars offset in DL
 ;--------------------------------------------------------------------
-ALIGN JUMP_ALIGN
-.BackupErrorCodeFromMasterOrSlaveToBH:
-    call    BackupErrorCodeFromTheRequestedDriveToBH
-    call    GetBasePortToCX             ; Load base port for resetted drive
-    push    cx
-    inc     dx                          ; DL to next drive
-    call    GetBasePortToCX
-    pop     di
-    cmp     cx, di                      ; Next drive is from same controller?
-    je      SHORT BackupErrorCodeFromTheRequestedDriveToBH
-.NoMoreDrivesOrNoSlaveDrive:
-    dec     dx
+IterateFindFirstDPTforIdevars:      
+    cmp     dl, [di+DPT.bIdevarsOffset]         ; Clears CF if matched
+    jz      .done
+    stc                                         ; Set CF for not found
+.done:  
     ret
-
-        
-;--------------------------------------------------------------------
-; GetBasePortToCX
-;   Parameters:
-;       DL:     Drive number
-;       DS:     RAMVARS segment
-;   Returns:
-;       CX:     Base port address
-;       CF:     Set if valid drive number
-;               Cleared if invalid drive number
-;   Corrupts registers:
-;       DI
-;--------------------------------------------------------------------
-ALIGN JUMP_ALIGN
-GetBasePortToCX:
-    xchg    cx, bx
-    xor     bx, bx
-    call    FindDPT_ForDriveNumber
-    mov     bl, [di+DPT.bIdevarsOffset]
-    mov     bx, [cs:bx+IDEVARS.wPort]
-    xchg    bx, cx
-    ret
-
-