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631f060b | 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 <- Last byte of Source\r | |
39 | cmp rsi, rdi\r | |
40 | mov rax, rdi ; rax <- Destination as return value\r | |
41 | jae @F ; Copy forward if Source > Destination\r | |
42 | cmp r9, rdi ; Overlapped?\r | |
43 | jae @CopyBackward ; Copy backward if overlapped\r | |
44 | @@:\r | |
45 | xor rcx, rcx\r | |
46 | sub rcx, rdi ; rcx <- -rdi\r | |
47 | and rcx, 15 ; rcx + rsi should be 16 bytes aligned\r | |
48 | jz @F ; skip if rcx == 0\r | |
49 | cmp rcx, r8\r | |
50 | cmova rcx, r8\r | |
51 | sub r8, rcx\r | |
52 | rep movsb\r | |
53 | @@:\r | |
54 | mov rcx, r8\r | |
55 | and r8, 15\r | |
56 | shr rcx, 4 ; rcx <- # of DQwords to copy\r | |
57 | jz @CopyBytes\r | |
58 | movdqa [rsp + 18h], xmm0 ; save xmm0 on stack\r | |
59 | @@:\r | |
60 | movdqu xmm0, [rsi] ; rsi may not be 16-byte aligned\r | |
61 | movntdq [rdi], xmm0 ; rdi should be 16-byte aligned\r | |
62 | add rsi, 16\r | |
63 | add rdi, 16\r | |
64 | loop @B\r | |
65 | mfence\r | |
66 | movdqa xmm0, [rsp + 18h] ; restore xmm0\r | |
67 | jmp @CopyBytes ; copy remaining bytes\r | |
68 | @CopyBackward:\r | |
69 | mov rsi, r9 ; rsi <- Last byte of Source\r | |
70 | lea rdi, [rdi + r8 - 1] ; rdi <- Last byte of Destination\r | |
71 | std\r | |
72 | @CopyBytes:\r | |
73 | mov rcx, r8\r | |
74 | rep movsb\r | |
75 | cld\r | |
76 | ret\r | |
77 | InternalMemCopyMem ENDP\r | |
78 | \r | |
79 | END\r |