Changeset 421 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/EBIOS

Timestamp:

May 9, 2012, 7:12:53 PM (13 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/EBIOS/AH48h_GetExtendedDriveParameters.asm (modified) (4 diffs)

trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/EBIOS/AH48h_GetExtendedDriveParameters.asm

@@ -38 +38 @@
 ;--------------------------------------------------------------------
 AH48h_HandlerForGetExtendedDriveParameters:
-    call    AccessDPT_GetPointerToDRVPARAMStoCSBX
-    push    bx
     call    AccessDPT_GetLbaSectorCountToBXDXAX
-    pop     di          ; CS:DI now points to DRVPARAMS
 
     ; Point DS:SI to Extended Drive Information Table to fill
+    push    ds
+    pop     es          ; DPT now in ES:DI
     mov     ds, [bp+IDEPACK.intpack+INTPACK.ds]
     mov     cx, MINIMUM_EDRIVEINFO_SIZE
@@ -51 +50 @@
 
     ; We do not support EDD Configuration Parameters so set to FFFF:FFFFh
-    mov     cx, -1      ; FFFFh
+    sub     cx, BYTE MINIMUM_EDRIVEINFO_SIZE+1  ; CX => FFFFh
     mov     [si+EDRIVE_INFO.fpEDDparams], cx
     mov     [si+EDRIVE_INFO.fpEDDparams+2], cx
@@ -59 +58 @@
 .SkipEddConfigurationParameters:
     mov     [si+EDRIVE_INFO.wSize], cx
-    mov     WORD [si+EDRIVE_INFO.wFlags], FLG_DMA_BOUNDARY_ERRORS_HANDLED_BY_BIOS
+    mov     WORD [si+EDRIVE_INFO.wFlags], FLG_DMA_BOUNDARY_ERRORS_HANDLED_BY_BIOS | FLG_CHS_INFORMATION_IS_VALID
 
     ; Store total sector count
@@ -69 +68 @@
     mov     WORD [si+EDRIVE_INFO.wSectorSize], 512
 
+    ; Store P-CHS
+    eMOVZX  dx, BYTE [es:di+DPT.bPchsHeads]
+    xor     ax, ax                                  ; Also a return code
+    mov     [si+EDRIVE_INFO.dwHeads], dx
+    mov     [si+EDRIVE_INFO.dwHeads+2], ax
+
+    mov     dl, [es:di+DPT.bPchsSectorsPerTrack]
+    mov     [si+EDRIVE_INFO.dwSectorsPerTrack], dx
+    mov     [si+EDRIVE_INFO.dwSectorsPerTrack+2], ax
+
+    mov     dx, [es:di+DPT.wPchsCylinders]
+    mov     [si+EDRIVE_INFO.dwCylinders], dx
+    mov     [si+EDRIVE_INFO.dwCylinders+2], ax
+
 .ReturnWithError:
     jmp     Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH