Changeset 474 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/Tools/Prepare.asm

Timestamp:

Oct 11, 2012, 5:30:15 PM (12 years ago)

Author:

aitotat@…

google:author:

aitotat@gmail.com

Message:

Changes to XTIDE Universal BIOS:

• Drive detection now displays autodetected XT-CF port and skips slave drives for XT-CF.
• AH=1Eh no longer tries to disable 8-bit mode for memory mapped and DMA transfer modes.
• Preparations to implement DMA.

File:

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

trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/Tools/Prepare.asm

@@ -82 +82 @@
 ;   Parameters:
 ;       AL:     Number of sectors to transfer
+;       DS:DI:  Ptr to DPT (in RAMVARS segment)
 ;       SS:BP:  Ptr to IDEPACK
 ;   Parameters on INTPACK:
@@ -93 +94 @@
 ALIGN JUMP_ALIGN
 Prepare_BufferToESSIforOldInt13hTransfer:
-    ; Normalize buffer pointer
+    cmp     BYTE [di+DPT_ATA.bDevice], DEVICE_8BIT_XTCF_DMA
+    jne     SHORT .NormalizeForSmallestPossibleOffset
+
+    ; Normalize segment for physical 64k pages
+    xor     bx, bx
+    mov     si, [bp+IDEPACK.intpack+INTPACK.es] ; Load segment
+%rep 4
+    shl     si, 1
+    rcl     bx, 1
+%endrep
+    add     si, [bp+IDEPACK.intpack+INTPACK.bx]
+    adc     bx, BYTE 0
+    mov     es, bx                              ; ES:SI now has physical address
+    jmp     SHORT Prepare_ByValidatingSectorsInALforOldInt13h
+
+    ; Normalize segment for 16b pages
+.NormalizeForSmallestPossibleOffset:
     mov     bx, [bp+IDEPACK.intpack+INTPACK.bx] ; Load offset
     mov     si, bx