1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
|
;------------------------------------------------------------------------------
;
; Copyright (c) 2006, Intel Corporation
; All rights reserved. This program and the accompanying materials
; are licensed and made available under the terms and conditions of the BSD License
; which accompanies this distribution. The full text of the license may be found at
; http://opensource.org/licenses/bsd-license.php
;
; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
;
; Module Name:
;
; ZeroMem.asm
;
; Abstract:
;
; ZeroMem function
;
; Notes:
;
;------------------------------------------------------------------------------
.code
;------------------------------------------------------------------------------
; VOID *
; InternalMemZeroMem (
; IN VOID *Buffer,
; IN UINTN Count
; )
;------------------------------------------------------------------------------
InternalMemZeroMem PROC USES rdi
mov rdi, rcx
xor rcx, rcx
xor eax, eax
sub rcx, rdi
and rcx, 15
mov r8, rdi
jz @F
cmp rcx, rdx
cmova rcx, rdx
sub rdx, rcx
rep stosb
@@:
mov rcx, rdx
and edx, 15
shr rcx, 4
jz @ZeroBytes
pxor xmm0, xmm0
@@:
movntdq [rdi], xmm0 ; rdi should be 16-byte aligned
add rdi, 16
loop @B
mfence
@ZeroBytes:
mov ecx, edx
rep stosb
mov rax, r8
ret
InternalMemZeroMem ENDP
END
|
