From e1f414b6a7d8a0424e0e01f655b09a4612b4d0e8 Mon Sep 17 00:00:00 2001
From: vanjeff <vanjeff@6f19259b-4bc3-4df7-8a09-765794883524>
Date: Fri, 22 Jun 2007 03:21:45 +0000
Subject: Import some basic libraries instances for Mde Packages.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@2704 6f19259b-4bc3-4df7-8a09-765794883524
---
 MdePkg/Library/BaseLib/Ia32/WriteDr5.asm | 48 ++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)
 create mode 100644 MdePkg/Library/BaseLib/Ia32/WriteDr5.asm

(limited to 'MdePkg/Library/BaseLib/Ia32/WriteDr5.asm')

diff --git a/MdePkg/Library/BaseLib/Ia32/WriteDr5.asm b/MdePkg/Library/BaseLib/Ia32/WriteDr5.asm
new file mode 100644
index 0000000000..e10434ef3d
--- /dev/null
+++ b/MdePkg/Library/BaseLib/Ia32/WriteDr5.asm
@@ -0,0 +1,48 @@
+;------------------------------------------------------------------------------
+;
+; 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:
+;
+;   WriteDr5.Asm
+;
+; Abstract:
+;
+;   AsmWriteDr5 function
+;
+; Notes:
+;
+;------------------------------------------------------------------------------
+
+    .586p
+    .model  flat,C
+    .code
+
+;------------------------------------------------------------------------------
+; UINTN
+; EFIAPI
+; AsmWriteDr5 (
+;   IN UINTN Value
+;   );
+;------------------------------------------------------------------------------
+AsmWriteDr5 PROC
+    mov     eax, [esp + 4]
+    ;
+    ; DR5 is alias to DR7 only if DE (in CR4) is cleared. Otherwise, writing to
+    ; 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, 23h, 0e8h
+    ret
+AsmWriteDr5 ENDP
+
+    END
-- 
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