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6e3b8c47 | 1 | #------------------------------------------------------------------------------ |
2 | # | |
3 | # Copyright (c) 2006, Intel Corporation | |
4 | # All rights reserved. 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 | .686: | |
25 | #.MODEL flat,C | |
26 | .xmm: | |
27 | .code: | |
28 | ||
29 | #------------------------------------------------------------------------------ | |
30 | # VOID * | |
31 | # _mem_ZeroMem ( | |
32 | # IN VOID *Buffer, | |
33 | # IN UINTN Count | |
34 | # ) | |
35 | #------------------------------------------------------------------------------ | |
36 | .global _InternalMemZeroMem | |
37 | _InternalMemZeroMem: | |
38 | push %edi | |
39 | movl 8(%esp), %edi | |
40 | movl 12(%esp), %edx | |
41 | xorl %ecx, %ecx | |
42 | subl %edi, %ecx | |
43 | xorl %eax, %eax | |
44 | andl $15, %ecx | |
45 | jz L0 | |
46 | cmpl %edx, %ecx | |
47 | cmova %edx, %ecx | |
48 | subl %ecx, %edx | |
49 | rep | |
50 | stosb | |
51 | L0: | |
52 | movl %edx, %ecx | |
53 | andl $15, %edx | |
54 | shrl $4, %ecx | |
55 | jz @ZeroBytes | |
56 | pxor %xmm0, %xmm0 | |
57 | L1: | |
58 | movntdq %xmm0, (%edi) | |
59 | addl $16, %edi | |
60 | loop L1 | |
61 | mfence | |
62 | @ZeroBytes: | |
63 | movl %edx, %ecx | |
64 | rep | |
65 | stosb | |
66 | movl 8(%esp), %eax | |
67 | pop %edi | |
68 | ret |