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
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
|
/* $NetBSD: lock.h,v 1.19 2022/02/13 13:41:53 riastradh Exp $ */
/*-
* Copyright (c) 2002 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Gregory McGarry.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Machine-dependent spin lock operations.
*/
#ifndef _SH3_LOCK_H_
#define _SH3_LOCK_H_
static __inline void __cpu_simple_lock_init(__cpu_simple_lock_t *)
__attribute__((__unused__));
static __inline void __cpu_simple_lock(__cpu_simple_lock_t *)
__attribute__((__unused__));
static __inline int __cpu_simple_lock_try(__cpu_simple_lock_t *)
__attribute__((__unused__));
static __inline void __cpu_simple_unlock(__cpu_simple_lock_t *)
__attribute__((__unused__));
static __inline int
__SIMPLELOCK_LOCKED_P(const __cpu_simple_lock_t *__ptr)
{
return *__ptr == __SIMPLELOCK_LOCKED;
}
static __inline int
__SIMPLELOCK_UNLOCKED_P(const __cpu_simple_lock_t *__ptr)
{
return *__ptr == __SIMPLELOCK_UNLOCKED;
}
static __inline void
__cpu_simple_lock_clear(__cpu_simple_lock_t *__ptr)
{
*__ptr = __SIMPLELOCK_UNLOCKED;
}
static __inline void
__cpu_simple_lock_set(__cpu_simple_lock_t *__ptr)
{
*__ptr = __SIMPLELOCK_LOCKED;
}
static __inline void
__cpu_simple_lock_init(__cpu_simple_lock_t *alp)
{
*alp = __SIMPLELOCK_UNLOCKED;
}
static __inline void
__cpu_simple_lock(__cpu_simple_lock_t *alp)
{
__asm volatile(
"1: tas.b @%0 \n"
" bf 1b \n"
: /* no outputs */
: "r" (alp)
: "cc", "memory");
}
static __inline int
__cpu_simple_lock_try(__cpu_simple_lock_t *alp)
{
int __rv;
__asm volatile(
" tas.b @%1 \n"
" movt %0 \n"
: "=r" (__rv)
: "r" (alp)
: "cc", "memory");
return (__rv);
}
static __inline void
__cpu_simple_unlock(__cpu_simple_lock_t *alp)
{
__insn_barrier();
*alp = __SIMPLELOCK_UNLOCKED;
}
#endif /* !_SH3_LOCK_H_ */
|