Changeset 150 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AH0h_HReset.asm

Timestamp:

Apr 29, 2011, 7:04:13 PM (13 years ago)

Author:

aitotat

google:author:

aitotat

Message:

Changes to XTIDE Universal BIOS:

• Redesigned Disk Parameter Tables.
• Code generalizations for supporting non-IDE devices in the future.

File:

• trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AH0h_HReset.asm (modified) (4 diffs)

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

@@ -13 +13 @@
 ;               If bit 7 is set all hard disks and floppy disks reset.
 ;       DS:DI:  Ptr to DPT (in RAMVARS segment)
-;       SS:BP:  Ptr to INTPACK
-;   Returns with INTPACK in SS:BP:
+;       SS:BP:  Ptr to IDEPACK
+;   Returns with INTPACK:
 ;       AH:     Int 13h return status (from drive requested in DL)
 ;       CF:     0 if succesfull, 1 if error
@@ -89 +89 @@
 
 ;--------------------------------------------------------------------
-; ResetHardDisksHandledByOurBIOS
+; AH0h_ResetHardDisksHandledByOurBIOS
 ;   Parameters:
 ;       BL:     Requested drive (DL when entering AH=00h)
 ;       DS:     RAMVARS segment
+;       SS:BP:  Ptr to IDEPACK
 ;   Returns:
 ;       BH:     Error code from requested drive (if available)
 ;   Corrupts registers:
-;       AX, CX, DX, DI
+;       AX, CX, DX, SI, DI
 ;--------------------------------------------------------------------
 ALIGN JUMP_ALIGN
@@ -103 +104 @@
     test    dh, dh
     jz      SHORT .AllDrivesReset       ; Return if no drives
-    mov     dl, [RAMVARS.bFirstDrv]     ; Load number of first our drive
+    mov     dl, [RAMVARS.bFirstDrv]     ; Load number of our first drive
     add     dh, dl                      ; DH = one past last drive to reset
 ALIGN JUMP_ALIGN
@@ -132 +133 @@
 .BackupErrorCodeFromMasterOrSlaveToBH:
     call    BackupErrorCodeFromTheRequestedDriveToBH
-    mov     cx, [RAMVARS.wIdeBase]      ; Load base port for resetted drive
-
+    call    GetBasePortToCX             ; Load base port for resetted drive
+    push    cx
     inc     dx                          ; DL to next drive
-    call    FindDPT_ForDriveNumber      ; Get DPT to DS:DI, store port to RAMVARS
-    jnc     SHORT .NoMoreDrivesOrNoSlaveDrive
-    cmp     cx, [RAMVARS.wIdeBase]      ; Next drive is from same controller?
+    call    GetBasePortToCX
+    pop     di
+    cmp     cx, di                      ; Next drive is from same controller?
     je      SHORT BackupErrorCodeFromTheRequestedDriveToBH
 .NoMoreDrivesOrNoSlaveDrive:
     dec     dx
+    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
+    jnc     SHORT .DptNotFound
+    mov     bl, [di+DPT.bIdevarsOffset]
+    mov     bx, [cs:bx+IDEVARS.wPort]
+.DptNotFound:
+    xchg    bx, cx
     ret