CryptoPkg/Library/IntrinsicLib/MemoryIntrinsics.c

   1 /** @file
   2   Intrinsic Memory Routines Wrapper Implementation for OpenSSL-based
   3   Cryptographic Library.
   4
   5 Copyright (c) 2010 - 2018, Intel Corporation. All rights reserved.<BR>
   6 SPDX-License-Identifier: BSD-2-Clause-Patent
   7
   8 **/
   9
  10 #include <Base.h>
  11 #include <Library/BaseMemoryLib.h>
  12 #include <Library/BaseLib.h>
  13
  14 typedef UINTN  size_t;
  15
  16 /* OpenSSL will use floating point support, and C compiler produces the _fltused
  17    symbol by default. Simply define this symbol here to satisfy the linker. */
  18 int _fltused = 1;
  19
  20 /* Sets buffers to a specified character */
  21 void * memset (void *dest, int ch, size_t count)
  22 {
  23   //
  24   // NOTE: Here we use one base implementation for memset, instead of the direct
  25   //       optimized SetMem() wrapper. Because the IntrinsicLib has to be built
  26   //       without whole program optimization option, and there will be some
  27   //       potential register usage errors when calling other optimized codes.
  28   //
  29
  30   //
  31   // Declare the local variables that actually move the data elements as
  32   // volatile to prevent the optimizer from replacing this function with
  33   // the intrinsic memset()
  34   //
  35   volatile UINT8  *Pointer;
  36
  37   Pointer = (UINT8 *)dest;
  38   while (count-- != 0) {
  39     *(Pointer++) = (UINT8)ch;
  40   }
  41
  42   return dest;
  43 }
  44
  45 /* Compare bytes in two buffers. */
  46 int memcmp (const void *buf1, const void *buf2, size_t count)
  47 {
  48   return (int)CompareMem(buf1, buf2, count);
  49 }
  50
  51 int strcmp (const char *s1, const char *s2)
  52 {
  53   return (int)AsciiStrCmp(s1, s2);
  54 }