Changeset 544 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/VariablesAndDPTs

Timestamp:

Apr 17, 2013, 5:16:00 PM (12 years ago)

Author:

aitotat@…

google:author:

aitotat@gmail.com

Message:

Changes to XTIDE Universal BIOS:

• Comparing BX:DX:AX against 15,482,880 sectors now works correctly.
• P-Cylinders are now stored to Compatible DPTs if EBIOS functions are disabled by CHS adressing mode.

File:

• trunk/XTIDE_Universal_BIOS/Src/VariablesAndDPTs/CreateDPT.asm (modified) (3 diffs)

trunk/XTIDE_Universal_BIOS/Src/VariablesAndDPTs/CreateDPT.asm

@@ -122 +122 @@
 
 %ifdef MODULE_EBIOS
+%ifdef CREATE_COMPATIBLE_DPT
+    ; Store P-Cylinders here for Compatible DPTs when FLGL_DPT_LBA is not set
+    ; or when drive has over 15,482,880 sectors
+    mov     [di+DPT.wPchsCylinders], ax
+%endif
     test    cl, FLGL_DPT_LBA
     jz      SHORT .NoLbaSoNoEBIOS
@@ -128 +133 @@
     ; we only need P-Cylinders so we can return it from AH=48h
     call    AtaGeometry_GetLbaSectorCountToBXDXAXfromAtaInfoInESSI
-    sub     ax, MAX_SECTOR_COUNT_TO_RETURN_PCHS & 0FFFFh
-    sbb     dx, MAX_SECTOR_COUNT_TO_RETURN_PCHS >> 16
+    sub     ax, (MAX_SECTOR_COUNT_TO_RETURN_PCHS+1) & 0FFFFh
+    sbb     dx, (MAX_SECTOR_COUNT_TO_RETURN_PCHS+1) >> 16
     sbb     bx, BYTE 0
-    ja      SHORT .StoreNumberOfLbaSectors
+    jnc     SHORT .StoreNumberOfLbaSectors
 
     ; Since we might have altered the default P-CHS parameters to be
@@ -146 +151 @@
 
     ; We could remove wPchsCylinders from DPT if we calculate it on AH=48h
-    ; but that would require extra code so we save ROM space instead.
+    ; (and for compatible DPTs) but that would require extra code so we save ROM space instead.
     mov     [di+DPT.wPchsCylinders], ax