Changeset 181 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/Device/IDE/IdeTransfer.asm

Timestamp:

Nov 13, 2011, 3:38:40 PM (13 years ago)

Author:

krille_n_@…

google:author:

krille_n_@hotmail.com

Message:

Changes to all parts of the project:

• Size optimizations.
• Added a define (EXCLUDE_FROM_XTIDECFG) to exclude unused library code from XTIDECFG.
• Tried to minimize time spent with interrupts disabled.
• Some minor attempts to improve speed (reordering instructions etc).
• Tried to improve readability, did some cleanup and fixed some errors in comments.

File:

• trunk/XTIDE_Universal_BIOS/Src/Device/IDE/IdeTransfer.asm (modified) (3 diffs)

trunk/XTIDE_Universal_BIOS/Src/Device/IDE/IdeTransfer.asm

@@ -230 +230 @@
 ALIGN JUMP_ALIGN
 DualByteReadForXtide:
-%ifdef USE_186
-    shr     cx, 2       ; Smaller but slower on 186/286
-%else
-    times 2 shr cx, 1   ; Loop unrolling
-%endif
+    eSHR_IM cx, 2       ; Loop unrolling
     mov     bx, 8       ; Bit mask for toggling data low/high reg
 ALIGN JUMP_ALIGN
@@ -322 +318 @@
     push    ds
     push    bx
-%ifdef USE_186
-    shr     cx, 2       ; Smaller but slower on 186/286
-%else
-    times 2 shr cx, 1   ; Loop unrolling
-%endif
+    eSHR_IM cx, 2       ; Loop unrolling
     mov     bx, 8       ; Bit mask for toggling data low/high reg
     push    es          ; Copy ES...
@@ -372 +364 @@
 WordWriteForXTIDEmod:
     push    ds
-%ifdef USE_186
-    shr     cx, 2       ; Smaller but slower on 186/286
-%else
-    times 2 shr cx, 1   ; Loop unrolling
-%endif
+    eSHR_IM cx, 2       ; Loop unrolling
     push    es          ; Copy ES...
     pop     ds          ; ...to DS