MdePkg/Library/BaseMemoryLibSse2/Ia32/ZeroMem.asm

   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     .686
  25     .model  flat,C
  26     .xmm
  27     .code
  28
  29 ;------------------------------------------------------------------------------
  30 ;  VOID *
  31 ;  EFIAPI
  32 ;  InternalMemZeroMem (
  33 ;    IN VOID   *Buffer,
  34 ;    IN UINTN  Count
  35 ;    );
  36 ;------------------------------------------------------------------------------
  37 InternalMemZeroMem  PROC    USES    edi
  38     mov     edi, [esp + 8]
  39     mov     edx, [esp + 12]
  40     xor     ecx, ecx
  41     sub     ecx, edi
  42     xor     eax, eax
  43     and     ecx, 15
  44     jz      @F
  45     cmp     ecx, edx
  46     cmova   ecx, edx
  47     sub     edx, ecx
  48     rep     stosb
  49 @@:
  50     mov     ecx, edx
  51     and     edx, 15
  52     shr     ecx, 4
  53     jz      @ZeroBytes
  54     pxor    xmm0, xmm0
  55 @@:
  56     movntdq [edi], xmm0
  57     add     edi, 16
  58     loop    @B
  59     mfence
  60 @ZeroBytes:
  61     mov     ecx, edx
  62     rep     stosb
  63     mov     eax, [esp + 8]
  64     ret
  65 InternalMemZeroMem  ENDP
  66
  67     END