Changeset 324 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/VariablesAndDPTs/CreateDPT.asm

Timestamp:

Mar 11, 2012, 6:45:03 PM (13 years ago)

Author:

aitotat@…

google:author:

aitotat@gmail.com

Message:

Changes to XTIDE Universal BIOS:

• Boot Menu now displays correct capacity when using user defined LBA.

File:

• trunk/XTIDE_Universal_BIOS/Src/VariablesAndDPTs/CreateDPT.asm (modified) (2 diffs)

trunk/XTIDE_Universal_BIOS/Src/VariablesAndDPTs/CreateDPT.asm

@@ -87 +87 @@
     jz      SHORT .StoreCHSfromAXBHBL       ; Small old drive with CHS addressing only
 
-    ; Check if 48-bit LBA supported
-    test    BYTE [es:si+ATA6.wSetSup83+1], A6_wSetSup83_LBA48>>8
-    jz      SHORT .StoreLBA28addressing
-    or      BYTE [di+DPT.bFlagsLow], ADDRESSING_MODE_LBA48<<ADDRESSING_MODE_FIELD_POSITION
-.StoreLBA28addressing:
-    or      BYTE [di+DPT.bFlagsLow], ADDRESSING_MODE_LBA28<<ADDRESSING_MODE_FIELD_POSITION
+    ; Store LBA 28/48 addressing and total sector count
     call    AtaID_GetTotalSectorCountToBXDXAXfromAtaInfoInESSI
-    mov     [di+DPT.twLbaSectors], ax
-    mov     [di+DPT.twLbaSectors+2], dx
-    mov     [di+DPT.twLbaSectors+4], bx
-    call    AtaID_GetLbaAssistedCHStoDXAXBLBH
+    call    StoreLbaAddressingAndTotalSectorCountFromBXDXAX
+
+    ; Replace sector count with user defined if necessary
+    call    AccessDPT_GetPointerToDRVPARAMStoCSBX
+    test    BYTE [cs:bx+DRVPARAMS.wFlags], FLG_DRVPARAMS_USERLBA
+    jz      SHORT .KeepTotalSectorsFromAtaID
+    mov     ax, [cs:bx+DRVPARAMS.dwMaximumLBA]
+    mov     dx, [cs:bx+DRVPARAMS.dwMaximumLBA+2]
+    xor     bx, bx
+
+    ; Compare user defined and ATA-ID sector count and select smaller
+    cmp     bx, [di+DPT.twLbaSectors+4]
+    jb      SHORT .StoreUserDefinedSectorCountToDPT
+    cmp     dx, [di+DPT.twLbaSectors+2]
+    jb      SHORT .StoreUserDefinedSectorCountToDPT
+    ja      SHORT .KeepTotalSectorsFromAtaID
+    cmp     ax, [di+DPT.twLbaSectors]
+    jae     SHORT .KeepTotalSectorsFromAtaID
+.StoreUserDefinedSectorCountToDPT:
+    call    StoreLbaAddressingAndTotalSectorCountFromBXDXAX
+
+    ; Calculate L-CHS for old INT 13h
+.KeepTotalSectorsFromAtaID:
+    mov     bx, [di+DPT.twLbaSectors+4]     ; Restore BX
+    call    AccessDPT_ConvertSectorCountFromBXDXAXtoLbaAssistedCHSinDXAXBLBH
     mov     [di+DPT.bLbaHeads], bl
     jmp     SHORT .StoreBlockMode
@@ -233 +249 @@
     ret
 
+
+;--------------------------------------------------------------------
+; StoreLbaAddressingAndTotalSectorCountFromBXDXAX
+;   Parameters:
+;       BX:DX:AX:   Total Sector Count
+;       DS:DI:      Ptr to Disk Parameter Table
+;   Returns:
+;       Nothing
+;   Corrupts registers:
+;       CX
+;--------------------------------------------------------------------
+StoreLbaAddressingAndTotalSectorCountFromBXDXAX:
+    mov     [di+DPT.twLbaSectors], ax
+    mov     [di+DPT.twLbaSectors+2], dx
+    mov     [di+DPT.twLbaSectors+4], bx
+
+    and     BYTE [di+DPT.bFlagsLow], ~MASKL_DPT_ADDRESSING_MODE
+    test    bx, bx
+    jnz     SHORT .SetLba48AddressingToDPT
+    test    dh, 0F0h
+    jz      SHORT .SetLba28AddressingToDPT
+.SetLba48AddressingToDPT:
+    or      BYTE [di+DPT.bFlagsLow], ADDRESSING_MODE_LBA48<<ADDRESSING_MODE_FIELD_POSITION
+.SetLba28AddressingToDPT:
+    or      BYTE [di+DPT.bFlagsLow], ADDRESSING_MODE_LBA28<<ADDRESSING_MODE_FIELD_POSITION
+    ret