MdePkg/BaseLib: Support IA32 processors without CLFLUSH

[mirror_edk2.git] / MdePkg / Library / BaseLib / Ia32 / ReadCr4.c

diff --git a/MdePkg/Library/BaseLib/Ia32/ReadCr4.c b/MdePkg/Library/BaseLib/Ia32/ReadCr4.c
index 71ffa9b72dd8422733766c0e1c72213a07b967fb..c9045fffa2bdc6ba7e86020f58ac45b218df8c70 100644 (file)
--- a/MdePkg/Library/BaseLib/Ia32/ReadCr4.c
+++ b/MdePkg/Library/BaseLib/Ia32/ReadCr4.c
@@ -1,22 +1,30 @@
 /** @file\r
   AsmReadCr4 function\r
 \r
-  Copyright (c) 2006 - 2007, 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
-//\r
-// Include common header file for this module.\r
-//\r
 \r
 \r
+\r
+/**\r
+  Reads the current value of the Control Register 4 (CR4).\r
+\r
+  Reads and returns the current value of CR4. 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 the Control Register 4 (CR4).\r
+\r
+**/\r
 UINTN\r
 EFIAPI\r
 AsmReadCr4 (\r