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631f060b | 1 | ;------------------------------------------------------------------------------\r |
2 | ;\r | |
373ade0e | 3 | ; Copyright (c) 2006 - 2008, Intel Corporation\r |
631f060b | 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 | ; SetMem 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 | ; InternalMemSetMem (\r | |
30 | ; IN VOID *Buffer,\r | |
31 | ; IN UINTN Count,\r | |
32 | ; IN UINT8 Value\r | |
33 | ; )\r | |
34 | ;------------------------------------------------------------------------------\r | |
35 | InternalMemSetMem PROC USES rdi rbx\r | |
36 | push rcx ; push Buffer\r | |
37 | mov rax, r8 ; rax = Value\r | |
38 | and rax, 0ffh ; rax = lower 8 bits of r8, upper 56 bits are 0\r | |
39 | mov ah, al ; ah = al\r | |
40 | mov bx, ax ; bx = ax\r | |
41 | shl rax, 10h ; rax = ax << 16\r | |
42 | mov ax, bx ; ax = bx\r | |
43 | mov rbx, rax ; ebx = eax\r | |
44 | shl rax, 20h ; rax = rax << 32\r | |
45 | or rax, rbx ; eax = ebx\r | |
46 | mov rdi, rcx ; rdi = Buffer\r | |
47 | mov rcx, rdx ; rcx = Count\r | |
48 | shr rcx, 3 ; rcx = rcx / 8\r | |
49 | cld\r | |
6f890d5b | 50 | rep stosq \r |
631f060b | 51 | mov rcx, rdx ; rcx = rdx\r |
52 | and rcx, 7 ; rcx = rcx & 7\r | |
6f890d5b | 53 | rep stosb \r |
631f060b | 54 | pop rax ; rax = Buffer\r |
55 | ret\r | |
56 | InternalMemSetMem ENDP\r | |
57 | \r | |
58 | END\r |