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;------------------------------------------------------------------------------
33EfiCommonLibZeroMem  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
51EfiCommonLibZeroMem  ENDP
52
53    END
54