Changeset 173 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/Tools/Address.asm

Timestamp:

Sep 18, 2011, 11:41:29 AM (13 years ago)

Author:

aitotat@…

google:author:

aitotat@gmail.com

Message:

Changes to XTIDE Universal BIOS:

• L-CHS parameters are now generated differently for LBA enabled drives.
• Booting to EBIOS partitions now seems to work (at least on one drive).

File:

• trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/Tools/Address.asm (modified) (3 diffs)

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

@@ -83 +83 @@
     ; LHead / PHeadCount and LHead % PHeadCount
     eMOVZX  ax, bh                  ; Copy L-CHS Head number to AX
-    div     BYTE [di+DPT.bPchsHeads]; AL = LHead / PHeadCount, AH = LHead % PHeadCount
+    div     BYTE [di+DPT.bHeads]    ; AL = LHead / PHeadCount, AH = LHead % PHeadCount
     mov     bh, ah                  ; Copy P-CHS Head number to BH
     xor     ah, ah                  ; AX = LHead / PHeadCount
@@ -124 +124 @@
     ; cylToSeek*headsPerCyl (18-bit result)
     mov     ax, cx                  ; Copy Cylinder number to AX
-    eMOVZX  dx, BYTE [di+DPT.bLchsHeads]
+    eMOVZX  dx, BYTE [di+DPT.bHeads]
     mul     dx                      ; DX:AX = cylToSeek*headsPerCyl
 
@@ -133 +133 @@
 
     ; *=sectPerTrack (18-bit by 6-bit multiplication with 24-bit result)
-    eMOVZX  cx, BYTE [di+DPT.bPchsSectors]  ; Load Sectors per Track
+    mov     cx, LBA_ASSIST_SPT      ; Load Sectors per Track
     xchg    ax, dx                  ; Hiword to AX, loword to DX
     mul     cl                      ; AX = hiword * Sectors per Track