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f1baef62 | 1 | ;------------------------------------------------------------------------------\r |
2 | ;\r | |
3 | ; Copyright (c) 2006, Intel Corporation\r | |
4 | ; All rights reserved. This program and the accompanying materials\r | |
5 | ; are licensed and made available under the terms and conditions of the BSD License\r | |
6 | ; which accompanies this distribution. The full text of the license may be found at\r | |
7 | ; http://opensource.org/licenses/bsd-license.php\r | |
8 | ;\r | |
9 | ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
10 | ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
11 | ;\r | |
12 | ; Module Name:\r | |
13 | ;\r | |
14 | ; CopyMem.Asm\r | |
15 | ;\r | |
16 | ; Abstract:\r | |
17 | ;\r | |
18 | ; CopyMem function\r | |
19 | ;\r | |
20 | ; Notes:\r | |
21 | ;\r | |
22 | ;------------------------------------------------------------------------------\r | |
23 | \r | |
24 | .code\r | |
25 | \r | |
26 | ;------------------------------------------------------------------------------\r | |
27 | ; VOID *\r | |
28 | ; EFIAPI\r | |
29 | ; InternalMemCopyMem (\r | |
30 | ; IN VOID *Destination,\r | |
31 | ; IN VOID *Source,\r | |
32 | ; IN UINTN Count\r | |
33 | ; )\r | |
34 | ;------------------------------------------------------------------------------\r | |
35 | InternalMemCopyMem PROC USES rsi rdi\r | |
36 | mov rsi, rdx ; rsi <- Source\r | |
37 | mov rdi, rcx ; rdi <- Destination\r | |
38 | lea r9, [rsi + r8 - 1] ; r9 <- End of Source\r | |
39 | cmp rsi, rdi\r | |
40 | mov rax, rdi ; rax <- Destination as return value\r | |
41 | jae @F\r | |
a0b4ea2a | 42 | cmp r9, rdi\r |
f1baef62 | 43 | jae @CopyBackward ; Copy backward if overlapped\r |
44 | @@:\r | |
45 | mov rcx, r8\r | |
46 | and r8, 7\r | |
47 | shr rcx, 3\r | |
48 | rep movsq ; Copy as many Qwords as possible\r | |
49 | jmp @CopyBytes\r | |
50 | @CopyBackward:\r | |
51 | mov rsi, r9 ; rsi <- End of Source\r | |
52 | lea rdi, [rdi + r8 - 1] ; esi <- End of Destination\r | |
53 | std ; set direction flag\r | |
54 | @CopyBytes:\r | |
55 | mov rcx, r8\r | |
56 | rep movsb ; Copy bytes backward\r | |
57 | cld\r | |
58 | ret\r | |
59 | InternalMemCopyMem ENDP\r | |
60 | \r | |
61 | END\r |