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
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
|
/* $OpenBSD: atomic.h,v 1.10 2014/11/14 09:56:06 dlg Exp $ */
/* Public Domain */
#ifndef _ARM_ATOMIC_H_
#define _ARM_ATOMIC_H_
#if defined(_KERNEL)
#include <arm/cpufunc.h>
/*
* on pre-v6 arm processors, it is necessary to disable interrupts if
* in the kernel and atomic updates are necessary without full mutexes
*
* eventually it would be interesting to have these functions
* support the V6/V7+ atomic instructions ldrex/strex if available
* on the CPU.
*/
static inline unsigned int
_atomic_cas_uint(volatile unsigned int *uip, unsigned int o, unsigned int n)
{
unsigned int cpsr;
unsigned int rv;
cpsr = disable_interrupts(I32_bit|F32_bit);
rv = *uip;
if (rv == o)
*uip = n;
restore_interrupts(cpsr);
return (rv);
}
#define atomic_cas_uint(_p, _o, _n) _atomic_cas_uint((_p), (_o), (_n))
static inline unsigned int
_atomic_cas_ulong(volatile unsigned long *uip, unsigned long o, unsigned long n)
{
unsigned int cpsr;
unsigned long rv;
cpsr = disable_interrupts(I32_bit|F32_bit);
rv = *uip;
if (rv == o)
*uip = n;
restore_interrupts(cpsr);
return (rv);
}
#define atomic_cas_ulong(_p, _o, _n) _atomic_cas_ulong((_p), (_o), (_n))
static inline void *
_atomic_cas_ptr(volatile void *uip, void *o, void *n)
{
unsigned int cpsr;
void * volatile *uipp = (void * volatile *)uip;
void *rv;
cpsr = disable_interrupts(I32_bit|F32_bit);
rv = *uipp;
if (rv == o)
*uipp = n;
restore_interrupts(cpsr);
return (rv);
}
#define atomic_cas_ptr(_p, _o, _n) _atomic_cas_ptr((_p), (_o), (_n))
static inline unsigned int
_atomic_swap_uint(volatile unsigned int *uip, unsigned int n)
{
unsigned int cpsr;
unsigned int rv;
cpsr = disable_interrupts(I32_bit|F32_bit);
rv = *uip;
*uip = n;
restore_interrupts(cpsr);
return (rv);
}
#define atomic_swap_uint(_p, _n) _atomic_swap_uint((_p), (_n))
static inline unsigned long
_atomic_swap_ulong(volatile unsigned long *uip, unsigned long n)
{
unsigned int cpsr;
unsigned long rv;
cpsr = disable_interrupts(I32_bit|F32_bit);
rv = *uip;
*uip = n;
restore_interrupts(cpsr);
return (rv);
}
#define atomic_swap_ulong(_p, _n) _atomic_swap_ulong((_p), (_n))
static inline void *
_atomic_swap_ptr(volatile void *uip, void *n)
{
unsigned int cpsr;
void * volatile *uipp = (void * volatile *)uip;
void *rv;
cpsr = disable_interrupts(I32_bit|F32_bit);
rv = *uipp;
*uipp = n;
restore_interrupts(cpsr);
return (rv);
}
#define atomic_swap_ptr(_p, _n) _atomic_swap_ptr((_p), (_n))
static inline unsigned int
_atomic_add_int_nv(volatile unsigned int *uip, unsigned int v)
{
unsigned int cpsr;
unsigned int rv;
cpsr = disable_interrupts(I32_bit|F32_bit);
rv = *uip + v;
*uip = rv;
restore_interrupts(cpsr);
return (rv);
}
#define atomic_add_int_nv(_p, _v) _atomic_add_int_nv((_p), (_v))
static inline unsigned long
_atomic_add_long_nv(volatile unsigned long *uip, unsigned long v)
{
unsigned int cpsr;
unsigned long rv;
cpsr = disable_interrupts(I32_bit|F32_bit);
rv = *uip + v;
*uip = rv;
restore_interrupts(cpsr);
return (rv);
}
#define atomic_add_long_nv(_p, _v) _atomic_add_long_nv((_p), (_v))
static inline unsigned int
_atomic_sub_int_nv(volatile unsigned int *uip, unsigned int v)
{
unsigned int cpsr;
unsigned int rv;
cpsr = disable_interrupts(I32_bit|F32_bit);
rv = *uip - v;
*uip = rv;
restore_interrupts(cpsr);
return (rv);
}
#define atomic_sub_int_nv(_p, _v) _atomic_sub_int_nv((_p), (_v))
static inline unsigned long
_atomic_sub_long_nv(volatile unsigned long *uip, unsigned long v)
{
unsigned int cpsr;
unsigned long rv;
cpsr = disable_interrupts(I32_bit|F32_bit);
rv = *uip - v;
*uip = rv;
restore_interrupts(cpsr);
return (rv);
}
#define atomic_sub_long_nv(_p, _v) _atomic_sub_long_nv((_p), (_v))
static inline void
atomic_setbits_int(volatile unsigned int *uip, unsigned int v)
{
unsigned int cpsr;
cpsr = disable_interrupts(I32_bit|F32_bit);
*uip |= v;
restore_interrupts(cpsr);
}
static inline void
atomic_clearbits_int(volatile unsigned int *uip, unsigned int v)
{
unsigned int cpsr;
cpsr = disable_interrupts(I32_bit|F32_bit);
*uip &= ~v;
restore_interrupts(cpsr);
}
#endif /* defined(_KERNEL) */
#endif /* _ARM_ATOMIC_H_ */
|
