1. Added comments to ASM files

2. Fixed a bug in 64-bit AsmDisablePaging64(), which may cause a #GP exception.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@2206 6f19259b-4bc3-4df7-8a09-765794883524

MdePkg/Library/BaseLib/Ia32/EnablePaging32.asm

@@ -40,14 +40,14 @@ InternalX86EnablePaging32 PROC
     mov     ecx, [esp + 8]
     mov     edx, [esp + 12]
     pushfd
-    pop     edi
+    pop     edi                         ; save flags in edi
     cli
     mov     eax, cr0
     bts     eax, 31
     mov     esp, [esp + 16]
     mov     cr0, eax
     push    edi
-    popfd
+    popfd                               ; restore flags
     push    edx
     push    ecx
     call    ebx