Changeset 421 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/Tools/Prepare.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/Tools/Prepare.asm (modified) (2 diffs)

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

@@ -53 +53 @@
     ; Get EBIOS command index to BX
     ; LBA28 or LBA48 command
-    cwd
-    mov     al, [es:si+DAP.qwLBA+3] ; Load LBA48 byte 3 (bits 24...31)
-    and     al, 0F0h                ; Clear LBA28 bits 24...27
-    or      ax, [es:si+DAP.qwLBA+4] ; Set bits from LBA bytes 4 and 5
-    cmp     dx, ax                  ; Set CF if any of bits 28...47 set
-    rcl     dx, 1                   ; DX = 0 for LBA28, DX = 1 for LBA48
     call    Prepare_GetOldInt13hCommandIndexToBX
-    or      bx, dx                  ; Set block mode / single sector bit
+    mov     al, [di+DPT.bFlagsLow]
+    shl     al, 1                   ; Set CF if LBA48 supported
+    adc     bl, bh                  ; LBA48 EXT commands
     ret
-%endif
+%endif ; MODULE_EBIOS
 
 
@@ -116 +112 @@
 ;       Nothing
 ;--------------------------------------------------------------------
-ALIGN JUMP_ALIGN
 Prepare_ByValidatingSectorsInALforOldInt13h:
     test    al, al