MdePkg/Library/BaseMemoryLibRepStr/Ia32/ZeroMem.S

   1 //
   2 // Include common header file for this module.
   3 //
   4 #include "CommonHeader.h"
   5
   6 #------------------------------------------------------------------------------
   7 #
   8 # Copyright (c) 2006, Intel Corporation
   9 # All rights reserved. This program and the accompanying materials
  10 # are licensed and made available under the terms and conditions of the BSD License
  11 # which accompanies this distribution.  The full text of the license may be found at
  12 # http://opensource.org/licenses/bsd-license.php
  13 #
  14 # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  15 # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  16 #
  17 # Module Name:
  18 #
  19 #   ZeroMem.Asm
  20 #
  21 # Abstract:
  22 #
  23 #   ZeroMem function
  24 #
  25 # Notes:
  26 #
  27 #------------------------------------------------------------------------------
  28
  29 .globl _InternalMemZeroMem
  30
  31 #------------------------------------------------------------------------------
  32 #  VOID *
  33 #  InternalMemZeroMem (
  34 #    IN VOID   *Buffer,
  35 #    IN UINTN  Count
  36 #    );
  37 #------------------------------------------------------------------------------
  38 _InternalMemZeroMem:
  39     push    %edi
  40     xorl    %eax,%eax
  41     movl    8(%esp),%edi
  42     movl    12(%esp),%ecx
  43     movl    %ecx,%edx
  44     shrl    $2,%ecx
  45     andl    $3,%edx
  46     pushl   %edi
  47     rep
  48     stosl
  49     movl    %edx,%ecx
  50     rep
  51     stosb
  52     popl    %eax
  53     pop     %edi
  54     ret