Changeset 547 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/VariablesAndDPTs/AtaGeometry.asm

Timestamp:

Apr 21, 2013, 3:47:11 PM (11 years ago)

Author:

aitotat@…

google:author:

aitotat@gmail.com

Message:

Changes to XTIDE Universal BIOS:

• Hotkeys were incorrectly initialized to use 'C' as first hard drive letter.
• All CHS translate modes should again work (incorrectly decremented DX instead of DL, it might or might not have caused problems).

File:

• trunk/XTIDE_Universal_BIOS/Src/VariablesAndDPTs/AtaGeometry.asm (modified) (2 diffs)

trunk/XTIDE_Universal_BIOS/Src/VariablesAndDPTs/AtaGeometry.asm

@@ -176 +176 @@
 ;       BL:     Number of L-CHS heads (?...240)
 ;       CX:     Number of bits shifted (0...3)
-;       DL:     ADDRESSING_MODE_NORMAL or ADDRESSING_MODE_LARGE
+;       DX:     ADDRESSING_MODE_NORMAL or ADDRESSING_MODE_LARGE
 ;   Corrupts registers:
 ;       Nothing
@@ -218 +218 @@
 ; ConvertPCHfromAXBLtoEnhancedCHinAXBL:
 ;   Parameters:
-;       AX:     Number of P-CHS cylinders (1...8192)
+;       AX:     Number of P-CHS cylinders (1...8192, or up to 17475 if fell from above)
 ;       BL:     Number of P-CHS heads (1...16)
 ;   Returns:
 ;       AX:     Number of L-CHS cylinders (?...1024)
-;       BL:     Number of L-CHS heads (?...128)
+;       BL:     Number of L-CHS heads (?...128, or up to 240 if fell from above)
 ;       CX:     Number of bits shifted (0...3)
-;       DL:     TRANSLATEMODE_NORMAL or TRANSLATEMODE_LARGE
+;       DX:     TRANSLATEMODE_NORMAL or TRANSLATEMODE_LARGE
 ;   Corrupts registers:
 ;       Nothing
 ;--------------------------------------------------------------------
 ConvertPCHfromAXBLtoEnhancedCHinAXBL:
+    cwd                 ; Assume TRANSLATEMODE_NORMAL
     xor     cx, cx      ; No bits to shift initially
-    xor     dl, dl      ; Assume TRANSLATEMODE_NORMAL
 .ShiftIfMoreThan1024Cylinder:
     cmp     ax, MAX_LCHS_CYLINDERS