From 631f060bb7fb457ff8720a690f4bdd378328cb2d Mon Sep 17 00:00:00 2001
From: mdkinney <mdkinney@6f19259b-4bc3-4df7-8a09-765794883524>
Date: Sat, 6 Oct 2007 23:23:49 +0000
Subject: Add BaseMemoryLib optimized for DXE

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@4036 6f19259b-4bc3-4df7-8a09-765794883524
---
 .../Library/BaseMemoryLibOptDxe/ScanMem64Wrapper.c | 69 ++++++++++++++++++++++
 1 file changed, 69 insertions(+)
 create mode 100644 MdePkg/Library/BaseMemoryLibOptDxe/ScanMem64Wrapper.c

(limited to 'MdePkg/Library/BaseMemoryLibOptDxe/ScanMem64Wrapper.c')

diff --git a/MdePkg/Library/BaseMemoryLibOptDxe/ScanMem64Wrapper.c b/MdePkg/Library/BaseMemoryLibOptDxe/ScanMem64Wrapper.c
new file mode 100644
index 0000000000..c9cc20316c
--- /dev/null
+++ b/MdePkg/Library/BaseMemoryLibOptDxe/ScanMem64Wrapper.c
@@ -0,0 +1,69 @@
+/** @file
+  ScanMem64() implementation.
+
+  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
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+  The following BaseMemoryLib instances share the same version of this file:
+
+    BaseMemoryLib
+    BaseMemoryLibMmx
+    BaseMemoryLibSse2
+    BaseMemoryLibRepStr
+    PeiMemoryLib
+    DxeMemoryLib
+
+**/
+
+//
+// Include common header file for this module.
+//
+
+
+#include "MemLibInternals.h"
+
+/**
+  Scans a target buffer for a 64-bit value, and returns a pointer to the matching 64-bit value
+  in the target buffer.
+
+  This function searches target the buffer specified by Buffer and Length from the lowest
+  address to the highest address for a 64-bit value that matches Value.  If a match is found,
+  then a pointer to the matching byte 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 64-bit boundary, then ASSERT().
+  If Length is not aligned on a 64-bit boundary, 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  Value       Value to search for in the target buffer.
+
+  @return A pointer to the matching byte in the target buffer or NULL otherwise.
+
+**/
+VOID *
+EFIAPI
+ScanMem64 (
+  IN CONST VOID  *Buffer,
+  IN UINTN       Length,
+  IN UINT64      Value
+  )
+{
+  if (Length == 0) {
+    return NULL;
+  }
+
+  ASSERT (Buffer != NULL);
+  ASSERT (((UINTN)Buffer & (sizeof (Value) - 1)) == 0);
+  ASSERT ((Length - 1) <= (MAX_ADDRESS - (UINTN)Buffer));
+  ASSERT ((Length & (sizeof (Value) - 1)) == 0);
+
+  return (VOID*)InternalMemScanMem64 (Buffer, Length / sizeof (Value), Value);
+}
-- 
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