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8b247ef7 JJ |
1 | ;------------------------------------------------------------------------------\r |
2 | ;\r | |
d3febfd9 | 3 | ; Copyright (c) 2006 - 2022, Intel Corporation. All rights reserved.<BR>\r |
9344f092 | 4 | ; SPDX-License-Identifier: BSD-2-Clause-Patent\r |
8b247ef7 JJ |
5 | ;\r |
6 | ; Module Name:\r | |
7 | ;\r | |
8 | ; ZeroMem.nasm\r | |
9 | ;\r | |
10 | ; Abstract:\r | |
11 | ;\r | |
12 | ; ZeroMem 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 | ; InternalMemZeroMem (\r | |
24 | ; IN VOID *Buffer,\r | |
25 | ; IN UINTN Count\r | |
26 | ; );\r | |
27 | ;------------------------------------------------------------------------------\r | |
28 | global ASM_PFX(InternalMemZeroMem)\r | |
29 | ASM_PFX(InternalMemZeroMem):\r | |
30 | push rdi\r | |
31 | mov rdi, rcx\r | |
32 | mov rcx, rdx\r | |
33 | mov r8, rdi\r | |
34 | and edx, 7\r | |
35 | shr rcx, 3\r | |
36 | jz @ZeroBytes\r | |
d3febfd9 | 37 | pxor mm0, mm0\r |
8b247ef7 | 38 | .0:\r |
d3febfd9 | 39 | movntq [rdi], mm0\r |
8b247ef7 JJ |
40 | add rdi, 8\r |
41 | loop .0\r | |
d3febfd9 | 42 | mfence\r |
8b247ef7 JJ |
43 | @ZeroBytes:\r |
44 | xor eax, eax\r | |
45 | mov ecx, edx\r | |
46 | rep stosb\r | |
47 | mov rax, r8\r | |
48 | pop rdi\r | |
49 | ret\r | |
50 | \r |