MdePkg/BaseLib: Support IA32 processors without CLFLUSH

[mirror_edk2.git] / MdePkg / Library / BaseLib / Ia32 / ReadDr4.c

diff --git a/MdePkg/Library/BaseLib/Ia32/ReadDr4.c b/MdePkg/Library/BaseLib/Ia32/ReadDr4.c
index fab9f67e0ede862c6b53e3329810b9130389d396..c31a8940a73580e9fea403b84c735a987bdac844 100644 (file)
--- a/MdePkg/Library/BaseLib/Ia32/ReadDr4.c
+++ b/MdePkg/Library/BaseLib/Ia32/ReadDr4.c
@@ -1,19 +1,30 @@
 /** @file\r
   AsmReadDr4 function\r
 \r
-  Copyright (c) 2006, Intel Corporation<BR>\r
-  All rights reserved. This program and the accompanying materials\r
+  Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>\r
+  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
+  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
-#if _MSC_EXTENSIONS\r
 \r
+\r
+\r
+/**\r
+  Reads the current value of Debug Register 4 (DR4).\r
+\r
+  Reads and returns the current value of DR4. This function is only available\r
+  on IA-32 and x64. This returns a 32-bit value on IA-32 and a 64-bit value on\r
+  x64.\r
+\r
+  @return The value of Debug Register 4 (DR4).\r
+\r
+**/\r
 UINTN\r
 EFIAPI\r
 AsmReadDr4 (\r
@@ -27,4 +38,3 @@ AsmReadDr4 (
   }\r
 }\r
 \r
-#endif\r