EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/X64/EfiZeroMemSSE2.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     xor     rcx, rcx
  36     xor     eax, eax
  37     sub     rcx, rdi
  38     and     rcx, 15
  39     jz      @F
  40     cmp     rcx, rdx
  41     cmova   rcx, rdx
  42     sub     rdx, rcx
  43     rep     stosb
  44 @@:
  45     mov     rcx, rdx
  46     and     edx, 15
  47     shr     rcx, 4
  48     jz      @ZeroBytes
  49     pxor    xmm0, xmm0
  50 @@:
  51     movdqa  [rdi], xmm0                 ; rdi should be 16-byte aligned
  52     add     rdi, 16
  53     loop    @B
  54 @ZeroBytes:
  55     mov     ecx, edx
  56     rep     stosb
  57     ret
  58 EfiCommonLibZeroMem  ENDP
  59
  60     END