MdePkg/Library/BaseMemoryLibMmx/Ia32/ZeroMem.S

   1 #------------------------------------------------------------------------------
   2 #
   3 # Copyright (c) 2006, Intel Corporation
   4 # All rights reserved. This program and the accompanying materials
   5 # are licensed and made available under the terms and conditions of the BSD License
   6 # which accompanies this distribution.  The full text of the license may be found at
   7 # http://opensource.org/licenses/bsd-license.php
   8 #
   9 # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  10 # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  11 #
  12 # Module Name:
  13 #
  14 #   ZeroMem.asm
  15 #
  16 # Abstract:
  17 #
  18 #   ZeroMem function
  19 #
  20 # Notes:
  21 #
  22 #------------------------------------------------------------------------------
  23
  24 .global _InternalMemZeroMem
  25
  26 #------------------------------------------------------------------------------
  27 #  VOID *
  28 #  EFIAPI
  29 #  InternalMemZeroMem (
  30 #    IN VOID   *Buffer,
  31 #    IN UINTN  Count
  32 #    );
  33 #------------------------------------------------------------------------------
  34 _InternalMemZeroMem:
  35     push    %edi
  36     movl    8(%esp), %edi
  37     movl    12(%esp), %ecx
  38     movl    %ecx, %edx
  39     shrl    $3, %ecx
  40     jz      @ZeroBytes
  41     pxor    %mm0, %mm0
  42 L0:
  43     movq    %mm0, (%edi)
  44     addl    $8, %edi
  45     loop    L0
  46 @ZeroBytes:
  47     andl    $7, %edx
  48     xorl    %eax, %eax
  49     movl    %edx, %ecx
  50     rep
  51     stosb
  52     movl    8(%esp), %eax
  53     pop     %edi
  54     ret