1 files changed, 42 insertions, 0 deletions
diff --git a/OldMdePkg/Library/BaseLib/X64/ReadDr5.asm b/OldMdePkg/Library/BaseLib/X64/ReadDr5.asm
new file mode 100644
index 0000000000..3bee3a56ec
--- /dev/null
+++ b/OldMdePkg/Library/BaseLib/X64/ReadDr5.asm
@@ -0,0 +1,42 @@
+;------------------------------------------------------------------------------
+;
+; Copyright (c) 2006, Intel Corporation
+; All rights reserved. This program and the accompanying materials
+; are licensed and made available under the terms and conditions of the BSD License
+; which accompanies this distribution.  The full text of the license may be found at
+; http://opensource.org/licenses/bsd-license.php
+;
+; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+;
+; Module Name:
+;
+;   ReadDr5.Asm
+;
+; Abstract:
+;
+;   AsmReadDr5 function
+;
+; Notes:
+;
+;------------------------------------------------------------------------------
+
+    .code
+
+;------------------------------------------------------------------------------
+; UINTN
+; EFIAPI
+; AsmReadDr5 (
+;   VOID
+;   );
+;------------------------------------------------------------------------------
+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
+
+    END