MdePkg/Library/BaseMemoryLibMmx/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 ;  InternalMemZeroMem (
  29 ;    IN VOID   *Buffer,
  30 ;    IN UINTN  Count
  31 ;    );
  32 ;------------------------------------------------------------------------------
  33 global ASM_PFX(InternalMemZeroMem)
  34 ASM_PFX(InternalMemZeroMem):
  35     push    edi
  36     mov     edi, [esp + 8]
  37     mov     ecx, [esp + 12]
  38     mov     edx, ecx
  39     shr     ecx, 3
  40     jz      @ZeroBytes
  41     pxor    mm0, mm0
  42 .0:
  43     movq    [edi], mm0
  44     add     edi, 8
  45     loop    .0
  46 @ZeroBytes:
  47     and     edx, 7
  48     xor     eax, eax
  49     mov     ecx, edx
  50     rep     stosb
  51     mov     eax, [esp + 8]
  52     pop     edi
  53     ret
  54