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.asm
15;
16; Abstract:
17;
18;   ZeroMem function
19;
20; Notes:
21;
22;------------------------------------------------------------------------------
23
24    .code
25
26;------------------------------------------------------------------------------
27;  VOID *
28;  InternalMemZeroMem (
29;    IN VOID   *Buffer,
30;    IN UINTN  Count
31;    )
32;------------------------------------------------------------------------------
33InternalMemZeroMem  PROC    USES    rdi
34    mov     rdi, rcx
35    xor     rcx, rcx
36    xor     eax, eax
37    sub     rcx, rdi
38    and     rcx, 15
39    mov     r8, rdi
40    jz      @F
41    cmp     rcx, rdx
42    cmova   rcx, rdx
43    sub     rdx, rcx
44    rep     stosb
45@@:
46    mov     rcx, rdx
47    and     edx, 15
48    shr     rcx, 4
49    jz      @ZeroBytes
50    pxor    xmm0, xmm0
51@@:
52    movntdq [rdi], xmm0                 ; rdi should be 16-byte aligned
53    add     rdi, 16
54    loop    @B
55    mfence
56@ZeroBytes:
57    mov     ecx, edx
58    rep     stosb
59    mov     rax, r8
60    ret
61InternalMemZeroMem  ENDP
62
63    END
64