CryptoPkg/Library/IntrinsicLib/MemoryIntrinsics.c

   1 /** @file
   2   Intrinsic Memory Routines Wrapper Implementation for OpenSSL-based
   3   Cryptographic Library.
   4
   5 Copyright (c) 2010 - 2014, Intel Corporation. All rights reserved.<BR>
   6 This program and the accompanying materials
   7 are licensed and made available under the terms and conditions of the BSD License
   8 which accompanies this distribution.  The full text of the license may be found at
   9 http://opensource.org/licenses/bsd-license.php
  10
  11 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  12 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  13
  14 **/
  15
  16 #include <Base.h>
  17 #include <Library/BaseMemoryLib.h>
  18
  19 /* OpenSSL will use floating point support, and C compiler produces the _fltused
  20    symbol by default. Simply define this symbol here to satisfy the linker. */
  21 int _fltused = 1;
  22
  23 /* Sets buffers to a specified character */
  24 void * memset (void *dest, char ch, unsigned int count)
  25 {
  26   //
  27   // NOTE: Here we use one base implementation for memset, instead of the direct
  28   //       optimized SetMem() wrapper. Because the IntrinsicLib has to be built
  29   //       without whole program optimization option, and there will be some
  30   //       potential register usage errors when calling other optimized codes.
  31   //
  32
  33   //
  34   // Declare the local variables that actually move the data elements as
  35   // volatile to prevent the optimizer from replacing this function with
  36   // the intrinsic memset()
  37   //
  38   volatile UINT8  *Pointer;
  39
  40   Pointer = (UINT8 *)dest;
  41   while (count-- != 0) {
  42     *(Pointer++) = ch;
  43   }
  44
  45   return dest;
  46 }