--- /dev/null
+/**\r
+ AsmReadDr4 function\r
+\r
+ Copyright (c) 2006 - 2007, Intel Corporation\r
+ All rights reserved. This program and the accompanying materials\r
+ are licensed and made available under the terms and conditions of the BSD License\r
+ which accompanies this distribution. The full text of the license may be found at\r
+ http://opensource.org/licenses/bsd-license.php\r
+\r
+ THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
+ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
+\r
+**/\r
+\r
+#include "BaseLibInternals.h"\r
+\r
+UINTN\r
+EFIAPI\r
+AsmReadDr4 (\r
+ VOID\r
+ )\r
+{\r
+ __asm {\r
+ _emit 0x0f\r
+ _emit 0x21\r
+ _emit 0xe0\r
+ }\r
+}\r
+\r