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eadcb0a1 JJ |
1 | ;------------------------------------------------------------------------------\r |
2 | ;\r | |
3 | ; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>\r | |
9344f092 | 4 | ; SPDX-License-Identifier: BSD-2-Clause-Patent\r |
eadcb0a1 JJ |
5 | ;\r |
6 | ; Module Name:\r | |
7 | ;\r | |
8 | ; CopyMem.nasm\r | |
9 | ;\r | |
10 | ; Abstract:\r | |
11 | ;\r | |
12 | ; CopyMem function\r | |
13 | ;\r | |
14 | ; Notes:\r | |
15 | ;\r | |
16 | ;------------------------------------------------------------------------------\r | |
17 | \r | |
18 | DEFAULT REL\r | |
19 | SECTION .text\r | |
20 | \r | |
21 | ;------------------------------------------------------------------------------\r | |
22 | ; VOID *\r | |
23 | ; EFIAPI\r | |
24 | ; InternalMemCopyMem (\r | |
25 | ; OUT VOID *DestinationBuffer,\r | |
26 | ; IN CONST VOID *SourceBuffer,\r | |
27 | ; IN UINTN Length\r | |
28 | ; );\r | |
29 | ;------------------------------------------------------------------------------\r | |
30 | global ASM_PFX(InternalMemCopyMem)\r | |
31 | ASM_PFX(InternalMemCopyMem):\r | |
32 | push rsi\r | |
33 | push rdi\r | |
34 | mov rsi, rdx ; rsi <- Source\r | |
35 | mov rdi, rcx ; rdi <- Destination\r | |
36 | lea r9, [rsi + r8 - 1] ; r9 <- End of Source\r | |
37 | cmp rsi, rdi\r | |
38 | mov rax, rdi ; rax <- Destination as return value\r | |
39 | jae .0\r | |
40 | cmp r9, rdi\r | |
41 | jae @CopyBackward ; Copy backward if overlapped\r | |
42 | .0:\r | |
43 | mov rcx, r8\r | |
44 | and r8, 7\r | |
45 | shr rcx, 3 ; rcx <- # of Qwords to copy\r | |
46 | jz @CopyBytes\r | |
47 | DB 0x49, 0xf, 0x7e, 0xc2 ; movd r10, mm0 (Save mm0 in r10)\r | |
48 | .1:\r | |
49 | DB 0xf, 0x6f, 0x6 ; movd mm0, [rsi]\r | |
50 | DB 0xf, 0xe7, 0x7 ; movntq [rdi], mm0\r | |
51 | add rsi, 8\r | |
52 | add rdi, 8\r | |
53 | loop .1\r | |
54 | mfence\r | |
55 | DB 0x49, 0xf, 0x6e, 0xc2 ; movd mm0, r10 (Restore mm0)\r | |
56 | jmp @CopyBytes\r | |
57 | @CopyBackward:\r | |
58 | mov rsi, r9 ; rsi <- End of Source\r | |
59 | lea rdi, [rdi + r8 - 1] ; rdi <- End of Destination\r | |
60 | std ; set direction flag\r | |
61 | @CopyBytes:\r | |
62 | mov rcx, r8\r | |
63 | rep movsb ; Copy bytes backward\r | |
64 | cld\r | |
65 | pop rdi\r | |
66 | pop rsi\r | |
67 | ret\r | |
68 | \r |