Changeset 543 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/VariablesAndDPTs/CompatibleDPT.asm

Timestamp:

Apr 16, 2013, 11:41:49 AM (12 years ago)

Author:

aitotat@…

google:author:

aitotat@gmail.com

Message:

Changes to XTIDE Universal BIOS:

• Compatible DPTs can no longer have more than 1024 cylinders.

File:

• trunk/XTIDE_Universal_BIOS/Src/VariablesAndDPTs/CompatibleDPT.asm (modified) (5 diffs)

trunk/XTIDE_Universal_BIOS/Src/VariablesAndDPTs/CompatibleDPT.asm

@@ -89 +89 @@
 ;--------------------------------------------------------------------
 FillToESDIusingDPTfromDSSI:
+    mov     ax, [si+DPT.wLchsCylinders]
+    call    AH8h_LimitAXtoMaximumLCylinders
     test    BYTE [si+DPT.bFlagsLow], MASKL_DPT_TRANSLATEMODE
     jz      SHORT FillStandardDPTtoESDIfromDPTinDSSI
@@ -96 +98 @@
 ; FillTranslatedDPTtoESDIfromDPTinDSSI
 ;   Parameters:
+;       AX:     Number of Logical Cylinders
 ;       CL:     Device Control Byte
 ;       DS:SI:  Ptr to DPT
@@ -106 +109 @@
 FillTranslatedDPTtoESDIfromDPTinDSSI:
     xor     dx, dx                      ; Clear for checksum
-    mov     ax, [si+DPT.wLchsCylinders]
-    ;MIN_U  ax, MAX_LCHS_CYLINDERS      ; Our DPT can have up to 1027
     call    StoswThenAddALandAHtoDL     ; Bytes 0 and 1 (Logical number of cylinders)
 
@@ -144 +145 @@
 ; FillStandardDPTtoESDIfromDPTinDSSI
 ;   Parameters:
+;       AX:     Number of Physical Cylinders == Number of Logical Cylinders
 ;       CL:     Device Control Byte
 ;       DS:SI:  Ptr to DPT
@@ -153 +155 @@
 ;--------------------------------------------------------------------
 FillStandardDPTtoESDIfromDPTinDSSI:
-    mov     ax, [si+DPT.wLchsCylinders]
     stosw               ; Bytes 0 and 1 (Physical number of cylinders)
     eMOVZX  ax, BYTE [si+DPT.bLchsHeads]