MdePkg/BaseLib: Support IA32 processors without CLFLUSH

[mirror_edk2.git] / MdePkg / Library / BaseLib / Ia32 / ReadDr0.c

diff --git a/MdePkg/Library/BaseLib/Ia32/ReadDr0.c b/MdePkg/Library/BaseLib/Ia32/ReadDr0.c
index cc91973295131787d992157944a3cf7e465e9714..5ef1087221f255aaa8c6ba06c72ac7ced6b61f8b 100644 (file)
--- a/MdePkg/Library/BaseLib/Ia32/ReadDr0.c
+++ b/MdePkg/Library/BaseLib/Ia32/ReadDr0.c
@@ -1,19 +1,30 @@
 /** @file\r
   AsmReadDr0 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 0 (DR0).\r
+\r
+  Reads and returns the current value of DR0. 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 0 (DR0).\r
+\r
+**/\r
 UINTN\r
 EFIAPI\r
 AsmReadDr0 (\r
@@ -25,4 +36,3 @@ AsmReadDr0 (
   }\r
 }\r
 \r
-#endif\r