MdePkg: Clean up source files

[mirror_edk2.git] / MdePkg / Library / PeiMemoryLib / MemLibGuid.c

diff --git a/MdePkg/Library/PeiMemoryLib/MemLibGuid.c b/MdePkg/Library/PeiMemoryLib/MemLibGuid.c
index 36da5b742424ea92fbe05836e41d9b6587ebac1c..4cc95d3aab563392e6901f2ee5bf24d8cb5aadfd 100644 (file)
--- a/MdePkg/Library/PeiMemoryLib/MemLibGuid.c
+++ b/MdePkg/Library/PeiMemoryLib/MemLibGuid.c
@@ -1,38 +1,41 @@
 /** @file\r
   Implementation of GUID functions.\r
 \r
-  Copyright (c) 2006, 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
-  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
-  Module Name:  MemLibGuid.c\r
-\r
-  The following BaseMemoryLib instances share the same version of this file:\r
+  The following BaseMemoryLib instances contain the same copy of this file:\r
 \r
     BaseMemoryLib\r
     BaseMemoryLibMmx\r
     BaseMemoryLibSse2\r
     BaseMemoryLibRepStr\r
+    BaseMemoryLibOptDxe\r
+    BaseMemoryLibOptPei\r
     PeiMemoryLib\r
-    DxeMemoryLib\r
+    UefiMemoryLib\r
+\r
+  Copyright (c) 2006 - 2018, 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
+\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
+#include "MemLibInternals.h"\r
+\r
 /**\r
   Copies a source GUID to a destination GUID.\r
 \r
   This function copies the contents of the 128-bit GUID specified by SourceGuid to\r
   DestinationGuid, and returns DestinationGuid.\r
+\r
   If DestinationGuid is NULL, then ASSERT().\r
   If SourceGuid is NULL, then ASSERT().\r
 \r
-  @param  DestinationGuid   Pointer to the destination GUID.\r
-  @param  SourceGuid        Pointer to the source GUID.\r
+  @param  DestinationGuid   The pointer to the destination GUID.\r
+  @param  SourceGuid        The pointer to the source GUID.\r
 \r
   @return DestinationGuid.\r
 \r
@@ -60,6 +63,7 @@ CopyGuid (
 \r
   This function compares Guid1 to Guid2.  If the GUIDs are identical then TRUE is returned.\r
   If there are any bit differences in the two GUIDs, then FALSE is returned.\r
+\r
   If Guid1 is NULL, then ASSERT().\r
   If Guid2 is NULL, then ASSERT().\r
 \r
@@ -94,19 +98,20 @@ CompareGuid (
   Scans a target buffer for a GUID, and returns a pointer to the matching GUID\r
   in the target buffer.\r
 \r
-  This function searches target the buffer specified by Buffer and Length from\r
+  This function searches the target buffer specified by Buffer and Length from\r
   the lowest address to the highest address at 128-bit increments for the 128-bit\r
   GUID value that matches Guid.  If a match is found, then a pointer to the matching\r
   GUID in the target buffer is returned.  If no match is found, then NULL is returned.\r
   If Length is 0, then NULL is returned.\r
+\r
   If Length > 0 and Buffer is NULL, then ASSERT().\r
   If Buffer is not aligned on a 32-bit boundary, then ASSERT().\r
   If Length is not aligned on a 128-bit boundary, then ASSERT().\r
-  If Length is greater than (MAX_ADDRESS ? Buffer + 1), then ASSERT(). \r
+  If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().\r
 \r
-  @param  Buffer  Pointer to the target buffer to scan.\r
-  @param  Length  Number of bytes in Buffer to scan.\r
-  @param  Guid    Value to search for in the target buffer.\r
+  @param  Buffer  The pointer to the target buffer to scan.\r
+  @param  Length  The number of bytes in Buffer to scan.\r
+  @param  Guid    The value to search for in the target buffer.\r
 \r
   @return A pointer to the matching Guid in the target buffer or NULL otherwise.\r
 \r
@@ -135,3 +140,32 @@ ScanGuid (
   }\r
   return NULL;\r
 }\r
+\r
+/**\r
+  Checks if the given GUID is a zero GUID.\r
+\r
+  This function checks whether the given GUID is a zero GUID. If the GUID is\r
+  identical to a zero GUID then TRUE is returned. Otherwise, FALSE is returned.\r
+\r
+  If Guid is NULL, then ASSERT().\r
+\r
+  @param  Guid        The pointer to a 128 bit GUID.\r
+\r
+  @retval TRUE        Guid is a zero GUID.\r
+  @retval FALSE       Guid is not a zero GUID.\r
+\r
+**/\r
+BOOLEAN\r
+EFIAPI\r
+IsZeroGuid (\r
+  IN CONST GUID  *Guid\r
+  )\r
+{\r
+  UINT64  LowPartOfGuid;\r
+  UINT64  HighPartOfGuid;\r
+\r
+  LowPartOfGuid  = ReadUnaligned64 ((CONST UINT64*) Guid);\r
+  HighPartOfGuid = ReadUnaligned64 ((CONST UINT64*) Guid + 1);\r
+\r
+  return (BOOLEAN) (LowPartOfGuid == 0 && HighPartOfGuid == 0);\r
+}\r