Changeset 421 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AH9h_HInit.asm

Timestamp:

May 9, 2012, 7:12:53 PM (12 years ago)

Author:

aitotat@…

google:author:

aitotat@gmail.com

Message:

Changes to XTIDE Universal BIOS:

• Addressing modes are now NORMAL, LARGE and LBA.
• L-CHS parameters are now generated differently for drives with 8192 or less cylinders.

File:

• trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AH9h_HInit.asm (modified) (2 diffs)

trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AH9h_HInit.asm

@@ -99 +99 @@
 ;;; SelectDrive
     ; Try to select drive and wait until ready
-    call    AccessDPT_GetDriveSelectByteToAL
+    call    AccessDPT_GetDriveSelectByteForOldInt13hToAL
     mov     [bp+IDEPACK.bDrvAndHead], al
     call    Device_SelectDrive
@@ -109 +109 @@
 
 ;;; InitializeDeviceParameters
-    ; Initialize CHS parameters if LBA is not used
-    test    BYTE [di+DPT.bFlagsLow], FLG_DRVNHEAD_LBA
+    ; Initialize CHS parameters if LBA is not used and
+    ; user has specified P-CHS parameters
+    test    BYTE [di+DPT.bFlagsLow], FLGL_DPT_ASSISTED_LBA
     jnz     SHORT .SkipInitializeDeviceParameters       ; No need to initialize CHS parameters if LBA mode enabled
+    call    AccessDPT_GetPointerToDRVPARAMStoCSBX
+    test    BYTE [cs:bx+DRVPARAMS.wFlags], FLG_DRVPARAMS_USERCHS    ; User specified P-CHS?
+    jz      SHORT .SkipInitializeDeviceParameters
 
     ; Initialize Logical Sectors per Track and Max Head number
-    mov     ah, [di+DPT.bPchsHeads]
-    dec     ah                          ; Max Head number
-    mov     dl, [di+DPT.bPchsSectors]   ; Sectors per Track
+    mov     ax, [cs:bx+DRVPARAMS.wHeadsAndSectors]
+    dec     ax                          ; Max Head number
+    xchg    al, ah                      ; Heads now in AH
+    mov     dx, ax                      ; Sectors per Track now in DL
     mov     al, COMMAND_INITIALIZE_DEVICE_PARAMETERS
     mov     bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_BSY, FLG_STATUS_BSY)