MdePkg/Library/BaseMemoryLibSse2/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 #  EFIAPI
  34 #  InternalMemZeroMem (
  35 #    IN VOID   *Buffer,
  36 #    IN UINTN  Count
  37 #    );
  38 #------------------------------------------------------------------------------
  39 _InternalMemZeroMem:
  40     push    %edi
  41     movl    8(%esp), %edi
  42     movl    12(%esp), %edx
  43     xorl    %ecx, %ecx
  44     subl    %edi, %ecx
  45     xorl    %eax, %eax
  46     andl    $15, %ecx
  47     jz      L0
  48     cmpl    %edx, %ecx
  49     cmova   %edx, %ecx
  50     subl    %ecx, %edx
  51     rep
  52     stosb
  53 L0:
  54     movl    %edx, %ecx
  55     andl    $15, %edx
  56     shrl    $4, %ecx
  57     jz      L_ZeroBytes
  58     pxor    %xmm0, %xmm0
  59 L1:
  60     movntdq %xmm0, (%edi)
  61     addl    $16, %edi
  62     loop    L1
  63     mfence
  64 L_ZeroBytes:
  65     movl    %edx, %ecx
  66     rep
  67     stosb
  68     movl    8(%esp), %eax
  69     pop     %edi
  70     ret