Changeset 422 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/VariablesAndDPTs/CreateDPT.asm

Timestamp:

May 12, 2012, 1:58:25 PM (13 years ago)

Author:

aitotat@…

google:author:

aitotat@gmail.com

Message:

Changes to XTIDE Universal BIOS:

• Modified ROMVARS for user defined CHS translation mode.
• Base DPT struct now includes initialization error flags again.

File:

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

trunk/XTIDE_Universal_BIOS/Src/VariablesAndDPTs/CreateDPT.asm

@@ -55 +55 @@
 ;--------------------------------------------------------------------
 .InitializeDPT:
-    mov     [di+DPT.bIdevarsOffset], bp ; IDEVARS must start in first 256 bytes of ROM
+    mov     [di+DPT.bIdevarsOffset], bp     ; IDEVARS must start in first 256 bytes of ROM
     ; Fall to .StoreDriveSelectAndDriveControlByte
 
@@ -95 +95 @@
 .StoreCHSparametersAndAddressingMode:
     ; Check if CHS defined in ROMVARS
-    call    AccessDPT_GetPointerToDRVPARAMStoCSBX
-    test    byte [cs:bx+DRVPARAMS.wFlags], FLG_DRVPARAMS_USERCHS    ; User specified P-CHS?
+    call    GetUserDefinedCapacityToBXAXandFlagsToCXandModeToDXfromROMVARS
+    test    cl, FLG_DRVPARAMS_USERCHS
     jz      SHORT .AutodetectPCHSvalues
 
-    ; Use DRVPARAMS P-CHS values instead of autodetected
-    mov     ax, [cs:bx+DRVPARAMS.wCylinders]
-    mov     bx, [cs:bx+DRVPARAMS.wHeadsAndSectors]
-    call    AtaGeometry_GetLCHStoAXBLBHfromPCHSinAXBLBH
+    ; Translate P-CHS to L-CHS
+    call    AtaGeometry_GetLCHStoAXBLBHfromPCHSinAXBLBHandTranslateModeInDX
     jmp     SHORT .StoreLCHStoDPT
-
-    ; Get L-CHS parameters and addressing mode
 .AutodetectPCHSvalues:
-    call    AtaGeometry_GetLCHStoAXBLBHfromAtaInfoInESSI
+    call    AtaGeometry_GetLCHStoAXBLBHfromAtaInfoInESSIandTranslateModeInDX
 
 .StoreLCHStoDPT:
-    eSHL_IM dl, ADDRESSING_MODE_FIELD_POSITION
+    eSHL_IM dl, TRANSLATEMODE_FIELD_POSITION
     or      cl, dl
     or      [di+DPT.bFlagsLow], cl      ; Shift count and addressing mode
@@ -144 +140 @@
 
     ; Load user defined LBA
-    call    AccessDPT_GetPointerToDRVPARAMStoCSBX
-    test    BYTE [cs:bx+DRVPARAMS.wFlags], FLG_DRVPARAMS_USERLBA
+    call    GetUserDefinedCapacityToBXAXandFlagsToCXandModeToDXfromROMVARS
+    test    cl, 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
+    xor     dx, dx
+    xchg    bx, dx      ; User defined LBA now in BX:DX:AX
     cmp     bx, [di+DPT.twLbaSectors+4]
     jb      SHORT .StoreUserDefinedSectorCountToDPT
@@ -160 +155 @@
     jae     SHORT .KeepTotalSectorsFromAtaID
 .StoreUserDefinedSectorCountToDPT:
-    xor     cx, cx      ; Always LBA28 for user defined values
+    ; CL bit FLGL_DPT_LBA48 is clear at this point
     call    StoreLba48AddressingFromCLandTotalSectorCountFromBXDXAX
 
@@ -234 +229 @@
 
 
+;--------------------------------------------------------------------
+; GetUserDefinedCapacityToBXAXandFlagsToCXandModeToDXfromROMVARS
+;   Parameters:
+;       DS:DI:      Ptr to Disk Parameter Table
+;   Returns:
+;       AX:         User defined P-CHS Cylinders or LBA low word
+;       BX:         User defined P-CHS Heads and Sectors or LBA high word
+;       DX:         Translate mode or TRANSLATEMODE_AUTO
+;       CX:         FLG_DRVPARAMS_USERCHS if user defined CHS in BX:AX
+;                   FLG_DRVPARAMS_USERLBA if user defined LBA in BX:AX
+;                   Zero if user has not defined capacity
+;   Corrupts registers:
+;       Nothing
+;--------------------------------------------------------------------
+GetUserDefinedCapacityToBXAXandFlagsToCXandModeToDXfromROMVARS:
+    call    AccessDPT_GetPointerToDRVPARAMStoCSBX
+
+    ; Get settings
+    mov     cx, [cs:bx+DRVPARAMS.wFlags]
+    mov     dx, cx
+    and     cx, BYTE FLG_DRVPARAMS_USERCHS | FLG_DRVPARAMS_USERLBA
+    and     dx, BYTE MASK_DRVPARAMS_TRANSLATEMODE
+    eSHR_IM dx, TRANSLATEMODE_FIELD_POSITION
+
+    ; Get capacity
+    mov     ax, [cs:bx+DRVPARAMS.wCylinders]        ; Or .dwMaximumLBA
+    mov     bx, [cs:bx+DRVPARAMS.wHeadsAndSectors]  ; Or .dwMaximumLBA+2
+    ret
+
+
 %ifdef MODULE_EBIOS
 ;--------------------------------------------------------------------