MdePkg/Library/BaseMemoryLibSse2/Ia32/ZeroMem.nasm

   1 ;------------------------------------------------------------------------------
   2 ;
   3 ; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
   4 ; 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.nasm
  15 ;
  16 ; Abstract:
  17 ;
  18 ;   ZeroMem function
  19 ;
  20 ; Notes:
  21 ;
  22 ;------------------------------------------------------------------------------
  23
  24     SECTION .text
  25
  26 ;------------------------------------------------------------------------------
  27 ;  VOID *
  28 ;  EFIAPI
  29 ;  InternalMemZeroMem (
  30 ;    IN VOID   *Buffer,
  31 ;    IN UINTN  Count
  32 ;    );
  33 ;------------------------------------------------------------------------------
  34 global ASM_PFX(InternalMemZeroMem)
  35 ASM_PFX(InternalMemZeroMem):
  36     push    edi
  37     mov     edi, [esp + 8]
  38     mov     edx, [esp + 12]
  39     xor     ecx, ecx
  40     sub     ecx, edi
  41     xor     eax, eax
  42     and     ecx, 15
  43     jz      .0
  44     cmp     ecx, edx
  45     cmova   ecx, edx
  46     sub     edx, ecx
  47     rep     stosb
  48 .0:
  49     mov     ecx, edx
  50     and     edx, 15
  51     shr     ecx, 4
  52     jz      @ZeroBytes
  53     pxor    xmm0, xmm0
  54 .1:
  55     movntdq [edi], xmm0
  56     add     edi, 16
  57     loop    .1
  58     mfence
  59 @ZeroBytes:
  60     mov     ecx, edx
  61     rep     stosb
  62     mov     eax, [esp + 8]
  63     pop     edi
  64     ret
  65