1 files changed, 47 insertions, 0 deletions
diff --git a/Core/MdePkg/Library/BaseLib/Ia32/ReadDr5.asm b/Core/MdePkg/Library/BaseLib/Ia32/ReadDr5.asm
new file mode 100644
index 0000000000..58b4ac26da
--- /dev/null
+++ b/Core/MdePkg/Library/BaseLib/Ia32/ReadDr5.asm
@@ -0,0 +1,47 @@
+;------------------------------------------------------------------------------
+;
+; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
+; 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:
+;
+;------------------------------------------------------------------------------
+
+    .586p
+    .model  flat,C
+    .code
+
+;------------------------------------------------------------------------------
+; UINTN
+; EFIAPI
+; AsmReadDr5 (
+;   VOID
+;   );
+;------------------------------------------------------------------------------
+AsmReadDr5  PROC
+    ;
+    ; DR5 is alias to DR7 only if DE (in CR4) is cleared. Otherwise, reading
+    ; this register will cause a #UD exception.
+    ;
+    ; MS assembler doesn't support this instruction since no one would use it
+    ; under normal circustances. Here opcode is used.
+    ;
+    DB      0fh, 21h, 0e8h
+    ret
+AsmReadDr5  ENDP
+
+    END