Changeset 150 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/VariablesAndDPTs/RamVars.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/VariablesAndDPTs/RamVars.asm (modified) (5 diffs)

trunk/XTIDE_Universal_BIOS/Src/VariablesAndDPTs/RamVars.asm

@@ -40 +40 @@
     eSHL_IM ax, 6                       ; Segment to first stolen kB (*=40h)
     mov     ds, ax
-    mov     WORD [FULLRAMVARS.wSign], W_SIGN_FULLRAMVARS
-    ; Fall to .InitializeRamvarsFromDS
+    mov     WORD [RAMVARS.wSignature], RAMVARS_SIGNATURE
+    ; Fall to .InitializeRamvars
 
 ;--------------------------------------------------------------------
@@ -59 +59 @@
     pop     es
     call    Memory_ZeroESDIwithSizeInCX
+    mov     WORD [RAMVARS.wSignature], RAMVARS_SIGNATURE
     ; Fall to .InitializeDriveTranslationAndReturn
 
@@ -92 +93 @@
     test    BYTE [cs:ROMVARS.wFlags], FLG_ROMVARS_FULLMODE
     jnz     SHORT .GetStolenSegmentToDS
-    mov     di, SEGMENT_RAMVARS_TOP_OF_INTERRUPT_VECTORS
+    mov     di, LITE_MODE_RAMVARS_SEGMENT
     mov     ds, di
     ret
@@ -105 +106 @@
     mov     ds, di                  ; EBDA segment to DS
     add     di, BYTE 64             ; DI to next stolen kB
-    cmp     WORD [FULLRAMVARS.wSign], W_SIGN_FULLRAMVARS
+    cmp     WORD [RAMVARS.wSignature], RAMVARS_SIGNATURE
     jne     SHORT .LoopStolenKBs    ; Loop until sign found (always found eventually)
     ret
@@ -167 +168 @@
 
 ;--------------------------------------------------------------------
-; RamVars_IncrementHardDiskCount
-;   Parameters:
-;       DL:     Drive number for new drive
-;       DS:     RAMVARS segment
-;   Returns:
-;       Nothing
-;   Corrupts registers:
-;       Nothing
-;--------------------------------------------------------------------
-RamVars_IncrementHardDiskCount:
-    inc     BYTE [RAMVARS.bDrvCnt]      ; Increment drive count to RAMVARS
-    cmp     BYTE [RAMVARS.bFirstDrv], 0 ; First drive set?
-    ja      SHORT .Return               ;  If so, return
-    mov     [RAMVARS.bFirstDrv], dl     ; Store first drive number
-.Return:
-    ret
-
-
-;--------------------------------------------------------------------
 ; RamVars_GetHardDiskCountFromBDAtoCX
 ;   Parameters: