MdePkg/Library/BaseMemoryLibRepStr/ScanMem64Wrapper.c

   1 /** @file
   2   ScanMem64() implementation.
   3
   4   The following BaseMemoryLib instances contain the same copy of this file:
   5
   6     BaseMemoryLib
   7     BaseMemoryLibMmx
   8     BaseMemoryLibSse2
   9     BaseMemoryLibRepStr
  10     BaseMemoryLibOptDxe
  11     BaseMemoryLibOptPei
  12     PeiMemoryLib
  13     UefiMemoryLib
  14
  15   Copyright (c) 2006 - 2009, Intel Corporation. All rights reserved.<BR>
  16   This program and the accompanying materials
  17   are licensed and made available under the terms and conditions of the BSD License
  18   which accompanies this distribution.  The full text of the license may be found at
  19   http://opensource.org/licenses/bsd-license.php
  20
  21   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  22   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  23
  24 **/
  25
  26 #include "MemLibInternals.h"
  27
  28 /**
  29   Scans a target buffer for a 64-bit value, and returns a pointer to the matching 64-bit value
  30   in the target buffer.
  31
  32   This function searches the target buffer specified by Buffer and Length from the lowest
  33   address to the highest address for a 64-bit value that matches Value.  If a match is found,
  34   then a pointer to the matching byte in the target buffer is returned.  If no match is found,
  35   then NULL is returned.  If Length is 0, then NULL is returned.
  36
  37   If Length > 0 and Buffer is NULL, then ASSERT().
  38   If Buffer is not aligned on a 64-bit boundary, then ASSERT().
  39   If Length is not aligned on a 64-bit boundary, then ASSERT().
  40   If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
  41
  42   @param  Buffer      Pointer to the target buffer to scan.
  43   @param  Length      Number of bytes in Buffer to scan.
  44   @param  Value       Value to search for in the target buffer.
  45
  46   @return A pointer to the matching byte in the target buffer or NULL otherwise.
  47
  48 **/
  49 VOID *
  50 EFIAPI
  51 ScanMem64 (
  52   IN CONST VOID  *Buffer,
  53   IN UINTN       Length,
  54   IN UINT64      Value
  55   )
  56 {
  57   if (Length == 0) {
  58     return NULL;
  59   }
  60
  61   ASSERT (Buffer != NULL);
  62   ASSERT (((UINTN)Buffer & (sizeof (Value) - 1)) == 0);
  63   ASSERT ((Length - 1) <= (MAX_ADDRESS - (UINTN)Buffer));
  64   ASSERT ((Length & (sizeof (Value) - 1)) == 0);
  65
  66   return (VOID*)InternalMemScanMem64 (Buffer, Length / sizeof (Value), Value);
  67 }