Changeset 221 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/Device/Idepack.asm

Timestamp:

Jan 25, 2012, 2:36:47 PM (12 years ago)

Author:

aitotat@…

google:author:

aitotat@gmail.com

Message:

Changes to XTIDE Universal BIOS:

• AH=0Ch (Seek) should work properly again.
• More than 127 sectors are no longer allowed for EBIOS functions.
• Changed location for BOOTNFO structs.

File:

• trunk/XTIDE_Universal_BIOS/Src/Device/Idepack.asm (modified) (6 diffs)

trunk/XTIDE_Universal_BIOS/Src/Device/Idepack.asm

@@ -25 +25 @@
 ;   Parameters:
 ;       AH:     IDE command to issue
+;       AL:     Number of sectors to transfer (for xfer commands)
 ;       BH:     Timeout ticks
 ;       BL:     IDE Status Register flag to wait after command
@@ -39 +40 @@
 ALIGN JUMP_ALIGN
 Idepack_ConvertDapToIdepackAndIssueCommandFromAH:
+    mov     [bp+IDEPACK.bSectorCount], al
     mov     [bp+IDEPACK.bCommand], ah
-    mov     al, [es:si+DAP.bSectorCount]
-    mov     [bp+IDEPACK.bSectorCount], al
 
     mov     al, [es:si+DAP.qwLBA]       ; LBA byte 0
@@ -56 +56 @@
     or      al, ah
     mov     [bp+IDEPACK.bDrvAndHead], al
-    les     si, [es:si+DAP.dwMemoryAddress]
+
+    ; Normalize data buffer pointer to ES:SI
+    mov     ax, [es:si+DAP.dwMemoryAddress]     ; Load offset
+    mov     cx, ax
+    eSHR_IM ax, 4                               ; Divide offset by 16
+    add     ax, [es:si+DAP.dwMemoryAddress+2]   ; Add segment
+    mov     es, ax                              ; Segment normalized
+    mov     si, cx
+    and     si, BYTE 0Fh                        ; Offset normalized
     jmp     SHORT GetDeviceControlByteToIdepackAndStartTransfer
 %endif
@@ -65 +73 @@
 ;   Parameters:
 ;       AH:     IDE command to issue
-;       AL:     Number of sectors to transfer
+;       AL:     Number of sectors to transfer (for xfer commands)
 ;       BH:     Timeout ticks
 ;       BL:     IDE Status Register flag to wait after command
@@ -73 +81 @@
 ;       DH:     Starting head number (0...255)
 ;       DS:DI:  Ptr to DPT (in RAMVARS segment)
+;       ES:SI:  Ptr to normalized data buffer (for xfer commands)
 ;       SS:BP:  Ptr to IDEPACK (containing INTPACK)
-;   Parameters on INTPACK:
-;       ES:BX:  Ptr to data buffer
 ;   Returns:
 ;       AH:     INT 13h Error Code
@@ -88 +95 @@
 
     push    bx
-    call    PrepareBuffer_ToESSIforOldInt13hTransfer
     call    Address_OldInt13hAddressToIdeAddress
     call    AccessDPT_GetDriveSelectByteToAL