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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 | ; OUT VOID *DestinationBuffer,\r | |
31 | ; IN CONST VOID *SourceBuffer,\r | |
32 | ; IN UINTN Length\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 | |
42 | cmp r9, rdi\r | |
43 | jae @CopyBackward ; Copy backward if overlapped\r | |
44 | @@:\r | |
45 | mov rcx, r8\r | |
46 | and r8, 7\r | |
47 | shr rcx, 3 ; rcx <- # of Qwords to copy\r | |
48 | jz @CopyBytes\r | |
49 | DB 49h, 0fh, 7eh, 0c2h ; movd r10, mm0 (Save mm0 in r10)\r | |
50 | @@:\r | |
51 | DB 0fh, 6fh, 06h ; movd mm0, [rsi]\r | |
52 | DB 0fh, 0e7h, 07h ; movntq [rdi], mm0\r | |
53 | add rsi, 8\r | |
54 | add rdi, 8\r | |
55 | loop @B\r | |
56 | mfence\r | |
57 | DB 49h, 0fh, 6eh, 0c2h ; movd mm0, r10 (Restore mm0)\r | |
58 | jmp @CopyBytes\r | |
59 | @CopyBackward:\r | |
60 | mov rsi, r9 ; rsi <- End of Source\r | |
61 | lea rdi, [rdi + r8 - 1] ; rdi <- End of Destination\r | |
62 | std ; set direction flag\r | |
63 | @CopyBytes:\r | |
64 | mov rcx, r8\r | |
65 | rep movsb ; Copy bytes backward\r | |
66 | cld\r | |
67 | ret\r | |
68 | InternalMemCopyMem ENDP\r | |
69 | \r | |
70 | END\r |