Changeset 207 in xtideuniversalbios for trunk/Assembly_Library/Src

Timestamp:

Jan 7, 2012, 7:57:57 PM (12 years ago)

Author:

gregli@…

google:author:

gregli@hotmail.com

Message:

Added buffer pointer denormalization check within the serial port code and reused the last portion of the NormalizeESSI and NormalizeESDI routines to save memory.

File:

• trunk/Assembly_Library/Src/Util/Registers.asm (modified) (1 diff)

trunk/Assembly_Library/Src/Util/Registers.asm

@@ -69 +69 @@
 ;   Corrupts registers:
 ;       AX, CX
+; 
+; Inline of NORMALIZE_FAR_POINTER so that we can share the last 2/3 of the 
+; routine with Registers_NormalizeFinish.
+; 
 ;--------------------------------------------------------------------
 ALIGN JUMP_ALIGN
 Registers_NormalizeESSI:
-    NORMALIZE_FAR_POINTER es, si, ax, cx
-    ret
+    mov         cx, si
+    and         si, byte 0fh
+    jmp         Registers_NormalizeFinish
 
 ALIGN JUMP_ALIGN
 Registers_NormalizeESDI:
-    NORMALIZE_FAR_POINTER es, di, ax, cx
+    mov         cx, di
+    and         di, byte 0fh
+;;; fall-through
+
+ALIGN JUMP_ALIGN        
+Registers_NormalizeFinish:      
+    eSHR_IM     cx, 4
+    mov         ax, es
+    add         ax, cx
+    mov         es, ax
     ret
-
+        
 
 ;--------------------------------------------------------------------