1#------------------------------------------------------------------------------
2#
3# Copyright (c) 2006 - 2008, 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
24ASM_GLOBAL ASM_PFX(InternalMemZeroMem)
25
26#------------------------------------------------------------------------------
27#  VOID *
28#  EFIAPI
29#  InternalMemZeroMem (
30#    IN VOID   *Buffer,
31#    IN UINTN  Count
32#    );
33#------------------------------------------------------------------------------
34ASM_PFX(InternalMemZeroMem):
35    push    %edi
36    movl    8(%esp), %edi
37    movl    12(%esp), %edx
38    xorl    %ecx, %ecx
39    subl    %edi, %ecx
40    xorl    %eax, %eax
41    andl    $15, %ecx
42    jz      L0
43    cmpl    %edx, %ecx
44    cmova   %edx, %ecx
45    subl    %ecx, %edx
46    rep
47    stosb
48L0:
49    movl    %edx, %ecx
50    andl    $15, %edx
51    shrl    $4, %ecx
52    jz      L_ZeroBytes
53    pxor    %xmm0, %xmm0
54L1:
55    movntdq %xmm0, (%edi)
56    addl    $16, %edi
57    loop    L1
58    mfence
59L_ZeroBytes:
60    movl    %edx, %ecx
61    rep
62    stosb
63    movl    8(%esp), %eax
64    pop     %edi
65    ret
66