1#ifndef __ARCH_M68K_ATOMIC__
2#define __ARCH_M68K_ATOMIC__
3
4#include <linux/types.h>
5#include <linux/irqflags.h>
6#include <asm/cmpxchg.h>
7#include <asm/barrier.h>
8
9
10
11
12
13
14
15
16
17
18#define ATOMIC_INIT(i) { (i) }
19
20#define atomic_read(v) ACCESS_ONCE((v)->counter)
21#define atomic_set(v, i) (((v)->counter) = i)
22
23
24
25
26
27#ifdef CONFIG_COLDFIRE
28#define ASM_DI "d"
29#else
30#define ASM_DI "di"
31#endif
32
33#define ATOMIC_OP(op, c_op, asm_op) \
34static inline void atomic_##op(int i, atomic_t *v) \
35{ \
36 __asm__ __volatile__(#asm_op "l %1,%0" : "+m" (*v) : ASM_DI (i));\
37} \
38
39#ifdef CONFIG_RMW_INSNS
40
41#define ATOMIC_OP_RETURN(op, c_op, asm_op) \
42static inline int atomic_##op##_return(int i, atomic_t *v) \
43{ \
44 int t, tmp; \
45 \
46 __asm__ __volatile__( \
47 "1: movel %2,%1\n" \
48 " " #asm_op "l %3,%1\n" \
49 " casl %2,%1,%0\n" \
50 " jne 1b" \
51 : "+m" (*v), "=&d" (t), "=&d" (tmp) \
52 : "g" (i), "2" (atomic_read(v))); \
53 return t; \
54}
55
56#else
57
58#define ATOMIC_OP_RETURN(op, c_op, asm_op) \
59static inline int atomic_##op##_return(int i, atomic_t * v) \
60{ \
61 unsigned long flags; \
62 int t; \
63 \
64 local_irq_save(flags); \
65 t = (v->counter c_op i); \
66 local_irq_restore(flags); \
67 \
68 return t; \
69}
70
71#endif
72
73#define ATOMIC_OPS(op, c_op, asm_op) \
74 ATOMIC_OP(op, c_op, asm_op) \
75 ATOMIC_OP_RETURN(op, c_op, asm_op)
76
77ATOMIC_OPS(add, +=, add)
78ATOMIC_OPS(sub, -=, sub)
79
80#undef ATOMIC_OPS
81#undef ATOMIC_OP_RETURN
82#undef ATOMIC_OP
83
84static inline void atomic_inc(atomic_t *v)
85{
86 __asm__ __volatile__("addql #1,%0" : "+m" (*v));
87}
88
89static inline void atomic_dec(atomic_t *v)
90{
91 __asm__ __volatile__("subql #1,%0" : "+m" (*v));
92}
93
94static inline int atomic_dec_and_test(atomic_t *v)
95{
96 char c;
97 __asm__ __volatile__("subql #1,%1; seq %0" : "=d" (c), "+m" (*v));
98 return c != 0;
99}
100
101static inline int atomic_dec_and_test_lt(atomic_t *v)
102{
103 char c;
104 __asm__ __volatile__(
105 "subql #1,%1; slt %0"
106 : "=d" (c), "=m" (*v)
107 : "m" (*v));
108 return c != 0;
109}
110
111static inline int atomic_inc_and_test(atomic_t *v)
112{
113 char c;
114 __asm__ __volatile__("addql #1,%1; seq %0" : "=d" (c), "+m" (*v));
115 return c != 0;
116}
117
118#ifdef CONFIG_RMW_INSNS
119
120#define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n)))
121#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
122
123#else
124
125static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
126{
127 unsigned long flags;
128 int prev;
129
130 local_irq_save(flags);
131 prev = atomic_read(v);
132 if (prev == old)
133 atomic_set(v, new);
134 local_irq_restore(flags);
135 return prev;
136}
137
138static inline int atomic_xchg(atomic_t *v, int new)
139{
140 unsigned long flags;
141 int prev;
142
143 local_irq_save(flags);
144 prev = atomic_read(v);
145 atomic_set(v, new);
146 local_irq_restore(flags);
147 return prev;
148}
149
150#endif
151
152#define atomic_dec_return(v) atomic_sub_return(1, (v))
153#define atomic_inc_return(v) atomic_add_return(1, (v))
154
155static inline int atomic_sub_and_test(int i, atomic_t *v)
156{
157 char c;
158 __asm__ __volatile__("subl %2,%1; seq %0"
159 : "=d" (c), "+m" (*v)
160 : ASM_DI (i));
161 return c != 0;
162}
163
164static inline int atomic_add_negative(int i, atomic_t *v)
165{
166 char c;
167 __asm__ __volatile__("addl %2,%1; smi %0"
168 : "=d" (c), "+m" (*v)
169 : ASM_DI (i));
170 return c != 0;
171}
172
173static inline void atomic_clear_mask(unsigned long mask, unsigned long *v)
174{
175 __asm__ __volatile__("andl %1,%0" : "+m" (*v) : ASM_DI (~(mask)));
176}
177
178static inline void atomic_set_mask(unsigned long mask, unsigned long *v)
179{
180 __asm__ __volatile__("orl %1,%0" : "+m" (*v) : ASM_DI (mask));
181}
182
183static __inline__ int __atomic_add_unless(atomic_t *v, int a, int u)
184{
185 int c, old;
186 c = atomic_read(v);
187 for (;;) {
188 if (unlikely(c == (u)))
189 break;
190 old = atomic_cmpxchg((v), c, c + (a));
191 if (likely(old == c))
192 break;
193 c = old;
194 }
195 return c;
196}
197
198#endif
199
