Add check before use to make code run more safer.

[mirror_edk2.git] / MdePkg / Library / BasePostCodeLibPort80 / PostCode.c

diff --git a/MdePkg/Library/BasePostCodeLibPort80/PostCode.c b/MdePkg/Library/BasePostCodeLibPort80/PostCode.c
index d3b11e66c7db0ac36542f262d21eb7739640fd0d..925c7404bc39b7f8db57fca10b5b1af50f1d15cd 100644 (file)
--- a/MdePkg/Library/BasePostCodeLibPort80/PostCode.c
+++ b/MdePkg/Library/BasePostCodeLibPort80/PostCode.c
@@ -1,28 +1,19 @@
 /** @file\r
-  Report Status Code Library Post Code functions for DXE Phase.\r
+  Post Code Library instance that writes post code values to I/O port 0x80.\r
 \r
-  Copyright (c) 2006, Intel Corporation<BR>\r
-  All rights reserved. This program and the accompanying materials                          \r
+  Copyright (c) 2006 - 2010, 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
-//\r
-// The package level header files this module uses\r
-//\r
 #include <Base.h>\r
-//\r
-// The protocols, PPI and GUID defintions for this module\r
-//\r
-//\r
-// The Library classes this module consumes\r
-//\r
+\r
 #include <Library/PostCodeLib.h>\r
 #include <Library/PcdLib.h>\r
 #include <Library/IoLib.h>\r
@@ -37,12 +28,12 @@
   display the 32-bit value on the status reporting device.\r
   \r
   PostCode() must actively prevent recursion.  If PostCode() is called while \r
-  processing another any other Report Status Code Library function, then \r
+  processing another any other Post Code Library function, then \r
   PostCode() must return Value immediately.\r
 \r
   @param  Value  The 32-bit value to write to the POST card.\r
 \r
-  @return  Value\r
+  @return The 32-bit value to write to the POST card.\r
 \r
 **/\r
 UINT32\r
@@ -68,16 +59,16 @@ PostCode (
   value on the status reporting device.  \r
 \r
   PostCodeWithDescription()must actively prevent recursion.  If \r
-  PostCodeWithDescription() is called while processing another any other Report \r
-  Status Code Library function, then PostCodeWithDescription() must return Value \r
+  PostCodeWithDescription() is called while processing another any other Post \r
+  Code Library function, then PostCodeWithDescription() must return Value \r
   immediately.\r
 \r
   @param  Value        The 32-bit value to write to the POST card.\r
-  @param  Description  Pointer to an ASCII string that is a description of the \r
+  @param  Description  The pointer to an ASCII string that is a description of the \r
                        POST code value.  This is an optional parameter that may \r
                        be NULL.\r
 \r
-  @return  Value\r
+  @return The 32-bit value to write to the POST card.\r
 \r
 **/\r
 UINT32\r
@@ -117,14 +108,13 @@ PostCodeEnabled (
 /**\r
   Returns TRUE if POST code descriptions are enabled.\r
 \r
-  This function returns TRUE if the \r
-  POST_CODE_PROPERTY_POST_CODE_ENABLED bit of \r
-  PcdPostCodePropertyMask is set.  Otherwise FALSE is returned.\r
+  This function returns TRUE if the POST_CODE_PROPERTY_POST_CODE_DESCRIPTION_ENABLED\r
+  bit of PcdPostCodePropertyMask is set.  Otherwise FALSE is returned.\r
 \r
-  @retval  TRUE   The POST_CODE_PROPERTY_POST_CODE_ENABLED \r
-                  bit of PcdPostCodeProperyMask is set.\r
-  @retval  FALSE  The POST_CODE_PROPERTY_POST_CODE_ENABLED \r
-                  bit of PcdPostCodeProperyMask is clear.\r
+  @retval  TRUE   The POST_CODE_PROPERTY_POST_CODE_DESCRIPTION_ENABLED bit of\r
+                  PcdPostCodeProperyMask is set.\r
+  @retval  FALSE  The POST_CODE_PROPERTY_POST_CODE_DESCRIPTION_ENABLED bit of\r
+                  PcdPostCodeProperyMask is clear.\r
 \r
 **/\r
 BOOLEAN\r
@@ -133,5 +123,5 @@ PostCodeDescriptionEnabled (
   VOID\r
   )\r
 {\r
-  return (BOOLEAN) ((PcdGet8(PcdPostCodePropertyMask) & POST_CODE_PROPERTY_POST_CODE_ENABLED) != 0);\r
+  return (BOOLEAN) ((PcdGet8(PcdPostCodePropertyMask) & POST_CODE_PROPERTY_POST_CODE_DESCRIPTION_ENABLED) != 0);\r
 }\r