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1 | #------------------------------------------------------------------------------ |
2 | # | |
4ea9375a HT |
3 | # Copyright (c) 2008, Intel Corporation. All rights reserved.<BR> |
4 | # This program and the accompanying materials | |
e8de4680 A |
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 | # EfiCopyMemRep1.S | |
15 | # | |
16 | # Abstract: | |
17 | # | |
18 | # CopyMem function | |
19 | # | |
20 | # Notes: | |
21 | # | |
22 | #------------------------------------------------------------------------------ | |
23 | #include <EfiBind.h> | |
24 | ||
25 | .code: | |
26 | ||
27 | .globl ASM_PFX(EfiCommonLibCopyMem) | |
28 | ||
29 | #------------------------------------------------------------------------------ | |
30 | # VOID | |
31 | # EfiCommonLibCopyMem ( | |
32 | # OUT VOID *Destination, | |
33 | # IN VOID *Source, | |
34 | # IN UINTN Count | |
35 | # ); | |
36 | #------------------------------------------------------------------------------ | |
37 | ASM_PFX(EfiCommonLibCopyMem): | |
38 | push %rsi | |
39 | push %rdi | |
40 | cmp %rcx,%rdx | |
41 | je CopyMemDone | |
42 | cmp $0x0,%r8 | |
43 | je CopyMemDone | |
44 | mov %rdx,%rsi | |
45 | mov %rcx,%rdi | |
46 | lea -1(%r8,%rsi,1),%r9 | |
47 | cmp %rdi,%rsi | |
48 | jae CopyBytes | |
49 | cmp %rdi,%r9 | |
50 | jb CopyBytes | |
51 | mov %r9,%rsi | |
52 | lea -1(%r8,%rdi,1),%rdi | |
53 | std | |
54 | ||
55 | CopyBytes: | |
56 | mov %r8,%rcx | |
57 | rep movsb %ds:(%rsi),%es:(%rdi) | |
58 | cld | |
59 | ||
60 | CopyMemDone: | |
61 | pop %rdi | |
62 | pop %rsi | |
63 | retq | |
64 | ||
65 | ||
66 |