/** @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
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
- This function copies a source GUID to a destination GUID.\r
+ Copies a source GUID to a destination GUID.\r
\r
- This function copies the contents of the 128-bit GUID specified by SourceGuid\r
- to DestinationGuid, and returns DestinationGuid.\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 A pointer to the destination GUID.\r
+ @param SourceGuid A pointer to the source GUID.\r
\r
- @return DestinationGuid\r
+ @return DestinationGuid.\r
\r
**/\r
GUID *\r
EFIAPI\r
CopyGuid (\r
- OUT GUID *DestinationGuid,\r
- IN CONST GUID *SourceGuid\r
+ OUT GUID *DestinationGuid,\r
+ IN CONST GUID *SourceGuid\r
)\r
{\r
WriteUnaligned64 (\r
}\r
\r
/**\r
- Compares two GUIDs\r
+ Compares two GUIDs.\r
\r
- This function compares Guid1 to Guid2. If the GUIDs are identical then TRUE\r
- is returned. If there are any bit differences in the two GUIDs, then FALSE is\r
- returned.\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
- @param Guid1 guid to compare\r
- @param Guid2 guid to compare\r
+ @param Guid1 A pointer to a 128 bit GUID.\r
+ @param Guid2 A pointer to a 128 bit GUID.\r
\r
- @retval TRUE if Guid1 == Guid2\r
- @retval FALSE if Guid1 != Guid2\r
+ @retval TRUE Guid1 and Guid2 are identical.\r
+ @retval FALSE Guid1 and Guid2 are not identical.\r
\r
**/\r
BOOLEAN\r
EFIAPI\r
CompareGuid (\r
- IN CONST GUID *Guid1,\r
- IN CONST GUID *Guid2\r
+ IN CONST GUID *Guid1,\r
+ IN CONST GUID *Guid2\r
)\r
{\r
- return (BOOLEAN)(\r
- ReadUnaligned64 ((CONST UINT64*)Guid1)\r
- == ReadUnaligned64 ((CONST UINT64*)Guid2) &&\r
- ReadUnaligned64 ((CONST UINT64*)Guid1 + 1)\r
- == ReadUnaligned64 ((CONST UINT64*)Guid2 + 1)\r
- );\r
+ UINT64 LowPartOfGuid1;\r
+ UINT64 LowPartOfGuid2;\r
+ UINT64 HighPartOfGuid1;\r
+ UINT64 HighPartOfGuid2;\r
+\r
+ LowPartOfGuid1 = ReadUnaligned64 ((CONST UINT64*) Guid1);\r
+ LowPartOfGuid2 = ReadUnaligned64 ((CONST UINT64*) Guid2);\r
+ HighPartOfGuid1 = ReadUnaligned64 ((CONST UINT64*) Guid1 + 1);\r
+ HighPartOfGuid2 = ReadUnaligned64 ((CONST UINT64*) Guid2 + 1);\r
+\r
+ return (BOOLEAN) (LowPartOfGuid1 == LowPartOfGuid2 && HighPartOfGuid1 == HighPartOfGuid2);\r
}\r
\r
/**\r
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
- the lowest address to the highest address at 128-bit increments for the\r
- 128-bit GUID value that matches Guid. If a match is found, then a pointer to\r
- the matching GUID in the target buffer is returned. If no match is found,\r
- then NULL is returned. If Length is 0, then NULL is returned.\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 Buffer is NULL, then ASSERT().\r
- If Buffer is not aligned on a 64-bit boundary, then ASSERT().\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
\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
- @return Pointer to the first occurrence.\r
- @retval NULL if Length == 0 or Guid was not found.\r
**/\r
VOID *\r
EFIAPI\r
ScanGuid (\r
- IN CONST VOID *Buffer,\r
- IN UINTN Length,\r
- IN CONST GUID *Guid\r
+ IN CONST VOID *Buffer,\r
+ IN UINTN Length,\r
+ IN CONST GUID *Guid\r
)\r
{\r
CONST GUID *GuidPtr;\r
\r
- ASSERT (Buffer != NULL);\r
- //\r
- // Make sure Buffer is aligned on a 64-bit boundary.\r
- //\r
- ASSERT (((UINTN) Buffer & 7) == 0);\r
-\r
+ ASSERT (((UINTN)Buffer & (sizeof (Guid->Data1) - 1)) == 0);\r
ASSERT (Length <= (MAX_ADDRESS - (UINTN)Buffer + 1));\r
+ ASSERT ((Length & (sizeof (*GuidPtr) - 1)) == 0);\r
\r
GuidPtr = (GUID*)Buffer;\r
- Buffer = GuidPtr + Length / sizeof (*GuidPtr);\r
+ Buffer = GuidPtr + Length / sizeof (*GuidPtr);\r
while (GuidPtr < (CONST GUID*)Buffer) {\r
if (CompareGuid (GuidPtr, Guid)) {\r
return (VOID*)GuidPtr;\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