X-Git-Url: https://git.proxmox.com/?a=blobdiff_plain;f=MdePkg%2FLibrary%2FBaseMemoryLibMmx%2FMemLibGuid.c;h=9ded5ca0f105b6d198d2181761329b79d169fb47;hb=2f88bd3a1296c522317f1c21377876de63de5be7;hp=feac25db500a41c2fb0906e768f10d37a07bc104;hpb=d531bfee01a957038d7ac1a16748558a62165fb2;p=mirror_edk2.git

diff --git a/MdePkg/Library/BaseMemoryLibMmx/MemLibGuid.c b/MdePkg/Library/BaseMemoryLibMmx/MemLibGuid.c
index feac25db50..9ded5ca0f1 100644
--- a/MdePkg/Library/BaseMemoryLibMmx/MemLibGuid.c
+++ b/MdePkg/Library/BaseMemoryLibMmx/MemLibGuid.c
@@ -2,6 +2,7 @@
   Implementation of GUID functions.
 
   The following BaseMemoryLib instances contain the same copy of this file:
+
     BaseMemoryLib
     BaseMemoryLibMmx
     BaseMemoryLibSse2
@@ -9,16 +10,10 @@
     BaseMemoryLibOptDxe
     BaseMemoryLibOptPei
     PeiMemoryLib
-    DxeMemoryLib
-
-  Copyright (c) 2006, Intel Corporation<BR>
-  All rights reserved. This program and the accompanying materials
-  are licensed and made available under the terms and conditions of the BSD License
-  which accompanies this distribution.  The full text of the license may be found at
-  http://opensource.org/licenses/bsd-license.php
+    UefiMemoryLib
 
-  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
-  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+  Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
+  SPDX-License-Identifier: BSD-2-Clause-Patent
 
 **/
 
@@ -29,11 +24,12 @@
 
   This function copies the contents of the 128-bit GUID specified by SourceGuid to
   DestinationGuid, and returns DestinationGuid.
+
   If DestinationGuid is NULL, then ASSERT().
   If SourceGuid is NULL, then ASSERT().
 
-  @param  DestinationGuid   Pointer to the destination GUID.
-  @param  SourceGuid        Pointer to the source GUID.
+  @param  DestinationGuid   The pointer to the destination GUID.
+  @param  SourceGuid        The pointer to the source GUID.
 
   @return DestinationGuid.
 
@@ -46,12 +42,12 @@ CopyGuid (
   )
 {
   WriteUnaligned64 (
-    (UINT64*)DestinationGuid,
-    ReadUnaligned64 ((CONST UINT64*)SourceGuid)
+    (UINT64 *)DestinationGuid,
+    ReadUnaligned64 ((CONST UINT64 *)SourceGuid)
     );
   WriteUnaligned64 (
-    (UINT64*)DestinationGuid + 1,
-    ReadUnaligned64 ((CONST UINT64*)SourceGuid + 1)
+    (UINT64 *)DestinationGuid + 1,
+    ReadUnaligned64 ((CONST UINT64 *)SourceGuid + 1)
     );
   return DestinationGuid;
 }
@@ -61,6 +57,7 @@ CopyGuid (
 
   This function compares Guid1 to Guid2.  If the GUIDs are identical then TRUE is returned.
   If there are any bit differences in the two GUIDs, then FALSE is returned.
+
   If Guid1 is NULL, then ASSERT().
   If Guid2 is NULL, then ASSERT().
 
@@ -83,31 +80,32 @@ CompareGuid (
   UINT64  HighPartOfGuid1;
   UINT64  HighPartOfGuid2;
 
-  LowPartOfGuid1  = ReadUnaligned64 ((CONST UINT64*) Guid1);
-  LowPartOfGuid2  = ReadUnaligned64 ((CONST UINT64*) Guid2);
-  HighPartOfGuid1 = ReadUnaligned64 ((CONST UINT64*) Guid1 + 1);
-  HighPartOfGuid2 = ReadUnaligned64 ((CONST UINT64*) Guid2 + 1);
+  LowPartOfGuid1  = ReadUnaligned64 ((CONST UINT64 *)Guid1);
+  LowPartOfGuid2  = ReadUnaligned64 ((CONST UINT64 *)Guid2);
+  HighPartOfGuid1 = ReadUnaligned64 ((CONST UINT64 *)Guid1 + 1);
+  HighPartOfGuid2 = ReadUnaligned64 ((CONST UINT64 *)Guid2 + 1);
 
-  return (BOOLEAN) (LowPartOfGuid1 == LowPartOfGuid2 && HighPartOfGuid1 == HighPartOfGuid2);
+  return (BOOLEAN)(LowPartOfGuid1 == LowPartOfGuid2 && HighPartOfGuid1 == HighPartOfGuid2);
 }
 
 /**
   Scans a target buffer for a GUID, and returns a pointer to the matching GUID
   in the target buffer.
 
-  This function searches target the buffer specified by Buffer and Length from
+  This function searches the target buffer specified by Buffer and Length from
   the lowest address to the highest address at 128-bit increments for the 128-bit
   GUID value that matches Guid.  If a match is found, then a pointer to the matching
   GUID in the target buffer is returned.  If no match is found, then NULL is returned.
   If Length is 0, then NULL is returned.
+
   If Length > 0 and Buffer is NULL, then ASSERT().
   If Buffer is not aligned on a 32-bit boundary, then ASSERT().
   If Length is not aligned on a 128-bit boundary, then ASSERT().
-  If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT(). 
+  If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
 
-  @param  Buffer  Pointer to the target buffer to scan.
-  @param  Length  Number of bytes in Buffer to scan.
-  @param  Guid    Value to search for in the target buffer.
+  @param  Buffer  The pointer to the target buffer to scan.
+  @param  Length  The number of bytes in Buffer to scan.
+  @param  Guid    The value to search for in the target buffer.
 
   @return A pointer to the matching Guid in the target buffer or NULL otherwise.
 
@@ -120,19 +118,50 @@ ScanGuid (
   IN CONST GUID  *Guid
   )
 {
-  CONST GUID                        *GuidPtr;
+  CONST GUID  *GuidPtr;
 
   ASSERT (((UINTN)Buffer & (sizeof (Guid->Data1) - 1)) == 0);
   ASSERT (Length <= (MAX_ADDRESS - (UINTN)Buffer + 1));
   ASSERT ((Length & (sizeof (*GuidPtr) - 1)) == 0);
 
-  GuidPtr = (GUID*)Buffer;
+  GuidPtr = (GUID *)Buffer;
   Buffer  = GuidPtr + Length / sizeof (*GuidPtr);
-  while (GuidPtr < (CONST GUID*)Buffer) {
+  while (GuidPtr < (CONST GUID *)Buffer) {
     if (CompareGuid (GuidPtr, Guid)) {
-      return (VOID*)GuidPtr;
+      return (VOID *)GuidPtr;
     }
+
     GuidPtr++;
   }
+
   return NULL;
 }
+
+/**
+  Checks if the given GUID is a zero GUID.
+
+  This function checks whether the given GUID is a zero GUID. If the GUID is
+  identical to a zero GUID then TRUE is returned. Otherwise, FALSE is returned.
+
+  If Guid is NULL, then ASSERT().
+
+  @param  Guid        The pointer to a 128 bit GUID.
+
+  @retval TRUE        Guid is a zero GUID.
+  @retval FALSE       Guid is not a zero GUID.
+
+**/
+BOOLEAN
+EFIAPI
+IsZeroGuid (
+  IN CONST GUID  *Guid
+  )
+{
+  UINT64  LowPartOfGuid;
+  UINT64  HighPartOfGuid;
+
+  LowPartOfGuid  = ReadUnaligned64 ((CONST UINT64 *)Guid);
+  HighPartOfGuid = ReadUnaligned64 ((CONST UINT64 *)Guid + 1);
+
+  return (BOOLEAN)(LowPartOfGuid == 0 && HighPartOfGuid == 0);
+}