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/DivU64x32Remainder.asm

@@ -33,18 +33,18 @@
 ;   );
 ;------------------------------------------------------------------------------
 InternalMathDivRemU64x32    PROC
-    mov     ecx, [esp + 12]
-    mov     eax, [esp + 8]
+    mov     ecx, [esp + 12]         ; ecx <- divisor
+    mov     eax, [esp + 8]          ; eax <- dividend[32..63]
     xor     edx, edx
-    div     ecx
+    div     ecx                     ; eax <- quotient[32..63], edx <- remainder
     push    eax
-    mov     eax, [esp + 8]
-    div     ecx
-    mov     ecx, [esp + 20]
+    mov     eax, [esp + 8]          ; eax <- dividend[0..31]
+    div     ecx                     ; eax <- quotient[0..31]
+    mov     ecx, [esp + 20]         ; ecx <- Remainder
     jecxz   @F                      ; abandon remainder if Remainder == NULL
     mov     [ecx], edx
 @@:
-    pop     edx
+    pop     edx                     ; edx <- quotient[32..63]
     ret
 InternalMathDivRemU64x32    ENDP