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1 | ;------------------------------------------------------------------------------\r | |
2 | ;\r | |
3 | ; Copyright (c) 2007, 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 | ; SetMem.asm\r | |
15 | ;\r | |
16 | ; Abstract:\r | |
17 | ;\r | |
18 | ; memset function\r | |
19 | ;\r | |
20 | ; Notes:\r | |
21 | ;\r | |
22 | ;------------------------------------------------------------------------------\r | |
23 | \r | |
24 | .686\r | |
25 | .model flat,C\r | |
26 | .mmx\r | |
27 | .code\r | |
28 | \r | |
29 | ;------------------------------------------------------------------------------\r | |
30 | ; VOID *\r | |
31 | ; memset (\r | |
32 | ; OUT VOID *Buffer,\r | |
33 | ; IN UINT8 Value,\r | |
34 | ; IN UINTN Count\r | |
35 | ; )\r | |
36 | ;------------------------------------------------------------------------------\r | |
37 | memset PROC USES edi\r | |
38 | mov al, [esp + 12]\r | |
39 | mov ah, al\r | |
40 | shrd edx, eax, 16\r | |
41 | shld eax, edx, 16\r | |
42 | mov ecx, [esp + 16] ; ecx <- Count\r | |
43 | cmp ecx, 0 ; if Count == 0, do nothing\r | |
44 | je @SetDone\r | |
45 | mov edi, [esp + 8] ; edi <- Buffer\r | |
46 | mov edx, ecx\r | |
47 | and edx, 7\r | |
48 | shr ecx, 3 ; # of Qwords to set\r | |
49 | jz @SetBytes\r | |
50 | add esp, -10h\r | |
51 | movq [esp], mm0 ; save mm0\r | |
52 | movq [esp + 8], mm1 ; save mm1\r | |
53 | movd mm0, eax\r | |
54 | movd mm1, eax\r | |
55 | psllq mm0, 32\r | |
56 | por mm0, mm1 ; fill mm0 with 8 Value's\r | |
57 | @@:\r | |
58 | movq [edi], mm0\r | |
59 | add edi, 8\r | |
60 | loop @B\r | |
61 | movq mm0, [esp] ; restore mm0\r | |
62 | movq mm1, [esp + 8] ; restore mm1\r | |
63 | add esp, 10h ; stack cleanup\r | |
64 | @SetBytes:\r | |
65 | mov ecx, edx\r | |
66 | rep stosb\r | |
67 | @SetDone: \r | |
68 | mov eax, [esp + 8] ; eax <- Buffer as return value\r | |
69 | ret\r | |
70 | memset ENDP\r | |
71 | \r | |
72 | END\r |