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Linux kernel mirror (for testing)
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kernel
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linux
1#ifndef __ARCH_M68K_ATOMIC__
2#define __ARCH_M68K_ATOMIC__
3
4#include <linux/types.h>
5#include <asm/system.h>
6
7/*
8 * Atomic operations that C can't guarantee us. Useful for
9 * resource counting etc..
10 */
11
12/*
13 * We do not have SMP m68k systems, so we don't have to deal with that.
14 */
15
16#define ATOMIC_INIT(i) { (i) }
17
18#define atomic_read(v) ((v)->counter)
19#define atomic_set(v, i) (((v)->counter) = i)
20
21static inline void atomic_add(int i, atomic_t *v)
22{
23 __asm__ __volatile__("addl %1,%0" : "+m" (*v) : "id" (i));
24}
25
26static inline void atomic_sub(int i, atomic_t *v)
27{
28 __asm__ __volatile__("subl %1,%0" : "+m" (*v) : "id" (i));
29}
30
31static inline void atomic_inc(atomic_t *v)
32{
33 __asm__ __volatile__("addql #1,%0" : "+m" (*v));
34}
35
36static inline void atomic_dec(atomic_t *v)
37{
38 __asm__ __volatile__("subql #1,%0" : "+m" (*v));
39}
40
41static inline int atomic_dec_and_test(atomic_t *v)
42{
43 char c;
44 __asm__ __volatile__("subql #1,%1; seq %0" : "=d" (c), "+m" (*v));
45 return c != 0;
46}
47
48static inline int atomic_inc_and_test(atomic_t *v)
49{
50 char c;
51 __asm__ __volatile__("addql #1,%1; seq %0" : "=d" (c), "+m" (*v));
52 return c != 0;
53}
54
55#ifdef CONFIG_RMW_INSNS
56
57static inline int atomic_add_return(int i, atomic_t *v)
58{
59 int t, tmp;
60
61 __asm__ __volatile__(
62 "1: movel %2,%1\n"
63 " addl %3,%1\n"
64 " casl %2,%1,%0\n"
65 " jne 1b"
66 : "+m" (*v), "=&d" (t), "=&d" (tmp)
67 : "g" (i), "2" (atomic_read(v)));
68 return t;
69}
70
71static inline int atomic_sub_return(int i, atomic_t *v)
72{
73 int t, tmp;
74
75 __asm__ __volatile__(
76 "1: movel %2,%1\n"
77 " subl %3,%1\n"
78 " casl %2,%1,%0\n"
79 " jne 1b"
80 : "+m" (*v), "=&d" (t), "=&d" (tmp)
81 : "g" (i), "2" (atomic_read(v)));
82 return t;
83}
84
85#define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n)))
86#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
87
88#else /* !CONFIG_RMW_INSNS */
89
90static inline int atomic_add_return(int i, atomic_t * v)
91{
92 unsigned long flags;
93 int t;
94
95 local_irq_save(flags);
96 t = atomic_read(v);
97 t += i;
98 atomic_set(v, t);
99 local_irq_restore(flags);
100
101 return t;
102}
103
104static inline int atomic_sub_return(int i, atomic_t * v)
105{
106 unsigned long flags;
107 int t;
108
109 local_irq_save(flags);
110 t = atomic_read(v);
111 t -= i;
112 atomic_set(v, t);
113 local_irq_restore(flags);
114
115 return t;
116}
117
118static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
119{
120 unsigned long flags;
121 int prev;
122
123 local_irq_save(flags);
124 prev = atomic_read(v);
125 if (prev == old)
126 atomic_set(v, new);
127 local_irq_restore(flags);
128 return prev;
129}
130
131static inline int atomic_xchg(atomic_t *v, int new)
132{
133 unsigned long flags;
134 int prev;
135
136 local_irq_save(flags);
137 prev = atomic_read(v);
138 atomic_set(v, new);
139 local_irq_restore(flags);
140 return prev;
141}
142
143#endif /* !CONFIG_RMW_INSNS */
144
145#define atomic_dec_return(v) atomic_sub_return(1, (v))
146#define atomic_inc_return(v) atomic_add_return(1, (v))
147
148static inline int atomic_sub_and_test(int i, atomic_t *v)
149{
150 char c;
151 __asm__ __volatile__("subl %2,%1; seq %0" : "=d" (c), "+m" (*v): "g" (i));
152 return c != 0;
153}
154
155static inline int atomic_add_negative(int i, atomic_t *v)
156{
157 char c;
158 __asm__ __volatile__("addl %2,%1; smi %0" : "=d" (c), "+m" (*v): "g" (i));
159 return c != 0;
160}
161
162static inline void atomic_clear_mask(unsigned long mask, unsigned long *v)
163{
164 __asm__ __volatile__("andl %1,%0" : "+m" (*v) : "id" (~(mask)));
165}
166
167static inline void atomic_set_mask(unsigned long mask, unsigned long *v)
168{
169 __asm__ __volatile__("orl %1,%0" : "+m" (*v) : "id" (mask));
170}
171
172static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
173{
174 int c, old;
175 c = atomic_read(v);
176 for (;;) {
177 if (unlikely(c == (u)))
178 break;
179 old = atomic_cmpxchg((v), c, c + (a));
180 if (likely(old == c))
181 break;
182 c = old;
183 }
184 return c != (u);
185}
186
187#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
188
189/* Atomic operations are already serializing */
190#define smp_mb__before_atomic_dec() barrier()
191#define smp_mb__after_atomic_dec() barrier()
192#define smp_mb__before_atomic_inc() barrier()
193#define smp_mb__after_atomic_inc() barrier()
194
195#include <asm-generic/atomic-long.h>
196#endif /* __ARCH_M68K_ATOMIC __ */