EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/X64/EfiZeroMem.asm

   1 ;------------------------------------------------------------------------------
   2 ;
   3 ; Copyright (c) 2007, 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.asm
  15 ;
  16 ; Abstract:
  17 ;
  18 ;   ZeroMem function
  19 ;
  20 ; Notes:
  21 ;
  22 ;------------------------------------------------------------------------------
  23
  24     .code
  25
  26 ;------------------------------------------------------------------------------
  27 ;  VOID *
  28 ;  EfiCommonLibZeroMem (
  29 ;    IN VOID   *Buffer,
  30 ;    IN UINTN  Size
  31 ;    );
  32 ;------------------------------------------------------------------------------
  33 EfiCommonLibZeroMem  PROC    USES    rdi
  34     mov     rdi, rcx
  35     mov     rcx, rdx
  36     mov     r8, rdi
  37     and     edx, 7
  38     shr     rcx, 3
  39     jz      @ZeroBytes
  40     DB      0fh, 0efh, 0c0h             ; pxor mm0, mm0
  41 @@:
  42     DB      48h, 0fh, 7eh, 07h          ; movd [rdi], mm0
  43     add     rdi, 8
  44     loop    @B
  45 @ZeroBytes:
  46     xor     eax, eax
  47     mov     ecx, edx
  48     rep     stosb
  49     mov     rax, r8
  50     ret
  51 EfiCommonLibZeroMem  ENDP
  52
  53     END