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1 | ;------------------------------------------------------------------------------\r |
2 | ;\r | |
3 | ; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>\r | |
4 | ; 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 | ; ZeroMem.nasm\r | |
15 | ;\r | |
16 | ; Abstract:\r | |
17 | ;\r | |
18 | ; ZeroMem function\r | |
19 | ;\r | |
20 | ; Notes:\r | |
21 | ;\r | |
22 | ;------------------------------------------------------------------------------\r | |
23 | \r | |
24 | DEFAULT REL\r | |
25 | SECTION .text\r | |
26 | \r | |
27 | ;------------------------------------------------------------------------------\r | |
28 | ; VOID *\r | |
29 | ; InternalMemZeroMem (\r | |
30 | ; IN VOID *Buffer,\r | |
31 | ; IN UINTN Count\r | |
32 | ; )\r | |
33 | ;------------------------------------------------------------------------------\r | |
34 | global ASM_PFX(InternalMemZeroMem)\r | |
35 | ASM_PFX(InternalMemZeroMem):\r | |
36 | push rdi\r | |
37 | mov rdi, rcx\r | |
38 | xor rcx, rcx\r | |
39 | xor eax, eax\r | |
40 | sub rcx, rdi\r | |
41 | and rcx, 15\r | |
42 | mov r8, rdi\r | |
43 | jz .0\r | |
44 | cmp rcx, rdx\r | |
45 | cmova rcx, rdx\r | |
46 | sub rdx, rcx\r | |
47 | rep stosb\r | |
48 | .0:\r | |
49 | mov rcx, rdx\r | |
50 | and edx, 15\r | |
51 | shr rcx, 4\r | |
52 | jz @ZeroBytes\r | |
53 | pxor xmm0, xmm0\r | |
54 | .1:\r | |
55 | movntdq [rdi], xmm0 ; rdi should be 16-byte aligned\r | |
56 | add rdi, 16\r | |
57 | loop .1\r | |
58 | mfence\r | |
59 | @ZeroBytes:\r | |
60 | mov ecx, edx\r | |
61 | rep stosb\r | |
62 | mov rax, r8\r | |
63 | pop rdi\r | |
64 | ret\r | |
65 | \r |