MdePkg/Library/BaseMemoryLibSse2/Ia32/ZeroMem.asm

   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     .686
  30     .model  flat,C
  31     .xmm
  32     .code
  33
  34 ;------------------------------------------------------------------------------
  35 ;  VOID *
  36 ;  EFIAPI
  37 ;  InternalMemZeroMem (
  38 ;    IN VOID   *Buffer,
  39 ;    IN UINTN  Count
  40 ;    );
  41 ;------------------------------------------------------------------------------
  42 InternalMemZeroMem  PROC    USES    edi
  43     mov     edi, [esp + 8]
  44     mov     edx, [esp + 12]
  45     xor     ecx, ecx
  46     sub     ecx, edi
  47     xor     eax, eax
  48     and     ecx, 15
  49     jz      @F
  50     cmp     ecx, edx
  51     cmova   ecx, edx
  52     sub     edx, ecx
  53     rep     stosb
  54 @@:
  55     mov     ecx, edx
  56     and     edx, 15
  57     shr     ecx, 4
  58     jz      @ZeroBytes
  59     pxor    xmm0, xmm0
  60 @@:
  61     movntdq [edi], xmm0
  62     add     edi, 16
  63     loop    @B
  64     mfence
  65 @ZeroBytes:
  66     mov     ecx, edx
  67     rep     stosb
  68     mov     eax, [esp + 8]
  69     ret
  70 InternalMemZeroMem  ENDP
  71
  72     END