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/DisablePaging32.asm

@@ -40,18 +40,18 @@ InternalX86DisablePaging32    PROC
     mov     ecx, [esp + 8]
     mov     edx, [esp + 12]
     pushfd
-    pop     edi
+    pop     edi                         ; save EFLAGS to edi
     cli
     mov     eax, cr0
     btr     eax, 31
     mov     esp, [esp + 16]
     mov     cr0, eax
     push    edi
-    popfd
+    popfd                               ; restore EFLAGS from edi
     push    edx
     push    ecx
     call    ebx
-    jmp     $
+    jmp     $                           ; EntryPoint() should not return
 InternalX86DisablePaging32    ENDP
 
     END