Changeset 537 in xtideuniversalbios for trunk/Assembly_Library

Timestamp:

Apr 11, 2013, 8:03:45 PM (12 years ago)

Author:

aitotat@…

google:author:

aitotat@gmail.com

Message:

Changes to Assembly Library:

• Commented that NORMALIZE_FAR_POINTER returns with CF set if segment overflow.

File:

• trunk/Assembly_Library/Inc/Registers.inc (modified) (1 diff)

trunk/Assembly_Library/Inc/Registers.inc

@@ -141 +141 @@
 ;   Returns:
 ;       %1:%2:      Normalized far pointer
+;       CF:         Set if overflow in (segment) normalization
+;                   Clear if normalized successfully
 ;   Corrupts registers:
 ;       %3, %4
 ;--------------------------------------------------------------------
 %macro NORMALIZE_FAR_POINTER 4
-    mov     %4, %2              ; Copy offset to scratch reg
-    and     %2, BYTE 0Fh        ; Clear offset bits 15...4
-    eSHR_IM %4, 4               ; Divide offset by 16
-    mov     %3, %1              ; Copy segment to scratch reg
-    add     %3, %4              ; Add shifted offset to segment
-    mov     %1, %3              ; Set normalized segment
+    mov     %4, %2          ; Copy offset to scratch reg
+    and     %2, BYTE 0Fh    ; Clear offset bits 15...4
+    eSHR_IM %4, 4           ; Divide offset by 16
+    mov     %3, %1          ; Copy segment to scratch reg
+    add     %3, %4          ; Add shifted offset to segment (sets or clears CF)
+    mov     %1, %3          ; Set normalized segment
 %endmacro