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/DivU64x32.asm

@@ -23,15 +23,23 @@
     .model  flat,C
     .code
 
+;------------------------------------------------------------------------------
+; UINT64
+; EFIAPI
+; InternalMathDivU64x32 (
+;   IN      UINT64                    Dividend,
+;   IN      UINT32                    Divisor
+;   );
+;------------------------------------------------------------------------------
 InternalMathDivU64x32   PROC
     mov     eax, [esp + 8]
     mov     ecx, [esp + 12]
     xor     edx, edx
     div     ecx
-    push    eax
+    push    eax                     ; save quotient on stack
     mov     eax, [esp + 8]
     div     ecx
-    pop     edx
+    pop     edx                     ; restore high-order dword of the quotient
     ret
 InternalMathDivU64x32   ENDP