MdePkg/Library/BaseMemoryLib/SetMem.c

   1 /** @file
   2   Implementation of the EfiSetMem routine. This function is broken
   3   out into its own source file so that it can be excluded from a
   4   build for a particular platform easily if an optimized version
   5   is desired.
   6
   7   Copyright (c) 2006 - 2008, Intel Corporation<BR>
   8   All rights reserved. This program and the accompanying materials
   9   are licensed and made available under the terms and conditions of the BSD License
  10   which accompanies this distribution.  The full text of the license may be found at
  11   http://opensource.org/licenses/bsd-license.php
  12
  13   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  14   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  15
  16 **/
  17
  18
  19
  20
  21 #include "MemLibInternals.h"
  22
  23 /**
  24   Set Buffer to Value for Size bytes.
  25
  26   @param  Buffer   Memory to set.
  27   @param  Length   Number of bytes to set
  28   @param  Value    Value of the set operation.
  29
  30   @return Buffer
  31
  32 **/
  33 VOID *
  34 EFIAPI
  35 InternalMemSetMem (
  36   IN      VOID                      *Buffer,
  37   IN      UINTN                     Length,
  38   IN      UINT8                     Value
  39   )
  40 {
  41   //
  42   // Declare the local variables that actually move the data elements as
  43   // volatile to prevent the optimizer from replacing this function with
  44   // the intrinsic memset()
  45   //
  46   volatile UINT8                    *Pointer;
  47
  48   Pointer = (UINT8*)Buffer;
  49   while (Length-- != 0) {
  50     *(Pointer++) = Value;
  51   }
  52   return Buffer;
  53 }