PeiMemoryLib\r
UefiMemoryLib\r
\r
- Copyright (c) 2006 - 2009, Intel Corporation. All rights reserved.<BR>\r
+ Copyright (c) 2006 - 2016, 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
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
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
\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
}\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