From a9a812a0ed4ab3d83941fdc6da281aebdb9bb296 Mon Sep 17 00:00:00 2001
From: bxing <bxing@6f19259b-4bc3-4df7-8a09-765794883524>
Date: Wed, 10 Jan 2007 06:57:04 +0000
Subject: 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/X64/ReadDr5.asm | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'MdePkg/Library/BaseLib/X64/ReadDr5.asm')

diff --git a/MdePkg/Library/BaseLib/X64/ReadDr5.asm b/MdePkg/Library/BaseLib/X64/ReadDr5.asm
index 0582502220..3bee3a56ec 100644
--- a/MdePkg/Library/BaseLib/X64/ReadDr5.asm
+++ b/MdePkg/Library/BaseLib/X64/ReadDr5.asm
@@ -31,6 +31,10 @@
 ;   );
 ;------------------------------------------------------------------------------
 AsmReadDr5  PROC
+    ;
+    ; There's no obvious reason to access this register, since it's aliased to
+    ; DR7 when DE=0 or an exception generated when DE=1
+    ;
     DB      0fh, 21h, 0e8h
     ret
 AsmReadDr5  ENDP
-- 
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