Add limitation clarification for usage of AsmPrepareThunk16(), AsmThunk16(), AsmPrepa...

[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..01f8f466de773e72f92101e7400914b5e163c7d0 100644 (file)
--- a/MdePkg/Library/BaseLib/Ia32/ReadDr0.c
+++ b/MdePkg/Library/BaseLib/Ia32/ReadDr0.c
@@ -1,7 +1,7 @@
 /** @file\r
   AsmReadDr0 function\r
 \r
-  Copyright (c) 2006, Intel Corporation<BR>\r
+  Copyright (c) 2006 - 2008, Intel Corporation<BR>\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
@@ -12,8 +12,19 @@
 \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