1. Updated function headers in all assembly files.

2. Split x86LowLevel.c into a bunch of C files to make images linked with BaseLib smaller.
3. Fixed a few minor bugs.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@1066 6f19259b-4bc3-4df7-8a09-765794883524

MdePkg/Library/BaseLib/Ia32/DivU64x32Remainder.asm

@@ -23,6 +23,15 @@
     .model  flat,C
     .code
 
+;------------------------------------------------------------------------------
+; UINT64
+; EFIAPI
+; InternalMathDivRemU64x32 (
+;   IN      UINT64                    Dividend,
+;   IN      UINT32                    Divisor,
+;   OUT     UINT32                    *Remainder
+;   );
+;------------------------------------------------------------------------------
 InternalMathDivRemU64x32    PROC
     mov     ecx, [esp + 12]
     mov     eax, [esp + 8]
@@ -32,7 +41,7 @@ InternalMathDivRemU64x32    PROC
     mov     eax, [esp + 8]
     div     ecx
     mov     ecx, [esp + 20]
-    jecxz   @F
+    jecxz   @F                      ; abandon remainder if Remainder == NULL
     mov     [ecx], edx
 @@:
     pop     edx