Changeset 30 for trunk/BOOTCODE/SPECIAL/FAT16.ASM

Timestamp:

May 6, 2011, 4:25:19 AM (14 years ago)

Author:

Ben Rietbroek

Message:

AiR-BOOT v1.07 -- As released with eCS v2.1. [2011-05-06]
Signature-date: 2006-03-13. (incorrect)
Trunk contains buildable v1.07 version as distributed with eCS v2.1.
Directory 'tags' contains v1.06 & v1.07 reference versions
built for all languages. Note that language ID for 'Dutch' changed
from 'DT' to 'NL' in v1.07 and that the v1.06 reference version also
uses 'NL' for 'Dutch'.
Also note that helper programs like the installer and setaboot are
are only modified for the OS/2 versions in v1.07.
The signature-date for v1.07 incorrectly states the same
date as for v1.06. The signature-version is correct.
Removed other binaries. (cd-rom images, old releases, etc.)
The tags serve as reference versions:

• v1.06: rebuilt from source. (tags/v1.06r)
• v1.07: built as released with eCS v2.1. (tags/v1.07r)

File:

• trunk/BOOTCODE/SPECIAL/FAT16.ASM (modified) (5 diffs)

trunk/BOOTCODE/SPECIAL/FAT16.ASM

@@ -20 +20 @@
 ;---------------------------------------------------------------------------
 
+IFDEF ModuleNames
+DB 'FAT16',0
+ENDIF
+
 ; Here is access code for accessing FAT-16 partitions. It's not a complete
 ;  File-API and only for simple readonly-access.
@@ -27 +31 @@
 ;        I did not want to code silly cylinder stuff here. I have also used
 ;        i386 code in here, because Linux requires so as well. Please note that
-;        I don't use i386 code anywhere (!) else in AiR-BOOT.
-;
+;        I don't use i386 code anywhere (!) else in AiR-BOOT.                    ; Rousseau: yes you did, movezx is 386-only :-)
+;                                                                                ; Replaced by 286 instructions.
 ; Initialize FAT-16 access on specified partition (required for following xs)
 ;        In: DS:SI - IPT-Entry that contains a FAT-16 partition
@@ -131 +135 @@
       mov    ax, dx
       sub    ax, 2                       ; Everything starts at Cluster 2
-      movzx  bx, FAT16_SecsPerCluster
+      ;movzx  bx, FAT16_SecsPerCluster
+      mov   bl,FAT16_SecsPerCluster
+      mov   bh,0
+
       mul    bx
       shl    edx, 16
@@ -145 +152 @@
    add    di, ax
    ; Finally, look for next Cluster following to this one...
-   movzx  bx, dl
+   ;movzx  bx, dl
+   mov   bl,dl
+   mov   bh,0
+
    shl    bx, 1                          ; BX - Offset within FAT-Table
    shr    dx, 8                          ; DX - FAT-Sector
@@ -259 +269 @@
          pop       ax
          mov    dx, si
-         movzx  cx, ah
+         ;movzx  cx, ah
+         mov   cl,ah
+         mov   ch,0
+
          rep    movsb
          mov    si, dx                   ; Restore SI