MdePkg/Library/BaseMemoryLibMmx/Ia32/ZeroMem.nasm

   1 ;------------------------------------------------------------------------------
   2 ;
   3 ; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
   4 ; SPDX-License-Identifier: BSD-2-Clause-Patent
   5 ;
   6 ; Module Name:
   7 ;
   8 ;   ZeroMem.nasm
   9 ;
  10 ; Abstract:
  11 ;
  12 ;   ZeroMem function
  13 ;
  14 ; Notes:
  15 ;
  16 ;------------------------------------------------------------------------------
  17
  18     SECTION .text
  19
  20 ;------------------------------------------------------------------------------
  21 ;  VOID *
  22 ;  InternalMemZeroMem (
  23 ;    IN VOID   *Buffer,
  24 ;    IN UINTN  Count
  25 ;    );
  26 ;------------------------------------------------------------------------------
  27 global ASM_PFX(InternalMemZeroMem)
  28 ASM_PFX(InternalMemZeroMem):
  29     push    edi
  30     mov     edi, [esp + 8]
  31     mov     ecx, [esp + 12]
  32     mov     edx, ecx
  33     shr     ecx, 3
  34     jz      @ZeroBytes
  35     pxor    mm0, mm0
  36 .0:
  37     movq    [edi], mm0
  38     add     edi, 8
  39     loop    .0
  40 @ZeroBytes:
  41     and     edx, 7
  42     xor     eax, eax
  43     mov     ecx, edx
  44     rep     stosb
  45     mov     eax, [esp + 8]
  46     pop     edi
  47     ret
  48