MdePkg/BaseLib: Support IA32 processors without CLFLUSH

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

diff --git a/MdePkg/Library/BaseLib/Ia32/ReadTsc.c b/MdePkg/Library/BaseLib/Ia32/ReadTsc.c
index 54cbd90aad90147fb5a722662ba484d84068b0ca..11a5095093412576e043d4159ed6a6801cdfb6e4 100644 (file)
--- a/MdePkg/Library/BaseLib/Ia32/ReadTsc.c
+++ b/MdePkg/Library/BaseLib/Ia32/ReadTsc.c
@@ -1,19 +1,29 @@
 /** @file\r
   AsmReadTsc 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 Time Stamp Counter (TSC).\r
+\r
+  Reads and returns the current value of TSC. This function is only available\r
+  on IA-32 and x64.\r
+\r
+  @return The current value of TSC\r
+\r
+**/\r
 UINT64\r
 EFIAPI\r
 AsmReadTsc (\r
@@ -25,4 +35,3 @@ AsmReadTsc (
   }\r
 }\r
 \r
-#endif\r