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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 | ||
b7089db1 | 24 | .globl _InternalMemZeroMem |
6e3b8c47 | 25 | |
26 | #------------------------------------------------------------------------------ | |
27 | # VOID * | |
eb227e96 | 28 | # EFIAPI |
29 | # InternalMemZeroMem ( | |
6e3b8c47 | 30 | # IN VOID *Buffer, |
31 | # IN UINTN Count | |
eb227e96 | 32 | # ); |
6e3b8c47 | 33 | #------------------------------------------------------------------------------ |
6e3b8c47 | 34 | _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 | |
eb227e96 | 48 | L0: |
6e3b8c47 | 49 | movl %edx, %ecx |
50 | andl $15, %edx | |
51 | shrl $4, %ecx | |
b7089db1 | 52 | jz L_ZeroBytes |
6e3b8c47 | 53 | pxor %xmm0, %xmm0 |
eb227e96 | 54 | L1: |
6e3b8c47 | 55 | movntdq %xmm0, (%edi) |
56 | addl $16, %edi | |
57 | loop L1 | |
58 | mfence | |
b7089db1 | 59 | L_ZeroBytes: |
6e3b8c47 | 60 | movl %edx, %ecx |
61 | rep | |
62 | stosb | |
63 | movl 8(%esp), %eax | |
64 | pop %edi | |
65 | ret |