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), %ecx |
41 | movl %ecx, %edx |
42 | shrl $3, %ecx |
43 | jz @ZeroBytes |
44 | pxor %mm0, %mm0 |
45 | L0: |
46 | movntq %mm0, (%edi) |
47 | addl $8, %edi |
48 | loop L0 |
49 | mfence |
50 | @ZeroBytes: |
51 | andl $7, %edx |
52 | xorl %eax, %eax |
53 | movl %edx, %ecx |
54 | rep |
55 | stosb |
56 | movl 8(%esp), %eax |
57 | pop %edi |
58 | ret |