MdePkg: Clean up source files

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

diff --git a/MdePkg/Library/BaseMemoryLibOptPei/MemLibGuid.c b/MdePkg/Library/BaseMemoryLibOptPei/MemLibGuid.c
index 6f6edd0d8ff2738a5b728202ca0493106a9c1ff9..4cc95d3aab563392e6901f2ee5bf24d8cb5aadfd 100644 (file)
--- a/MdePkg/Library/BaseMemoryLibOptPei/MemLibGuid.c
+++ b/MdePkg/Library/BaseMemoryLibOptPei/MemLibGuid.c
@@ -2,7 +2,7 @@
   Implementation of GUID functions.\r
 \r
   The following BaseMemoryLib instances contain the same copy of this file:\r
-  \r
+\r
     BaseMemoryLib\r
     BaseMemoryLibMmx\r
     BaseMemoryLibSse2\r
@@ -12,7 +12,7 @@
     PeiMemoryLib\r
     UefiMemoryLib\r
 \r
-  Copyright (c) 2006 - 2009, Intel Corporation. All rights reserved.<BR>\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
@@ -30,7 +30,7 @@
 \r
   This function copies the contents of the 128-bit GUID specified by SourceGuid to\r
   DestinationGuid, and returns DestinationGuid.\r
-  \r
+\r
   If DestinationGuid is NULL, then ASSERT().\r
   If SourceGuid is NULL, then ASSERT().\r
 \r
@@ -63,7 +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
+\r
   If Guid1 is NULL, then ASSERT().\r
   If Guid2 is NULL, then ASSERT().\r
 \r
@@ -103,7 +103,7 @@ CompareGuid (
   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
+\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
@@ -140,3 +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