1 #ifndef __ARCH_M68KNOMMU_ATOMIC__
2 #define __ARCH_M68KNOMMU_ATOMIC__
4 #include <asm/system.h> /* local_irq_XXX() */
7 * Atomic operations that C can't guarantee us. Useful for
8 * resource counting etc..
12 * We do not have SMP m68k systems, so we don't have to deal with that.
15 typedef struct { int counter
; } atomic_t
;
16 #define ATOMIC_INIT(i) { (i) }
18 #define atomic_read(v) ((v)->counter)
19 #define atomic_set(v, i) (((v)->counter) = i)
21 static __inline__
void atomic_add(int i
, atomic_t
*v
)
23 #ifdef CONFIG_COLDFIRE
24 __asm__
__volatile__("addl %1,%0" : "+m" (*v
) : "d" (i
));
26 __asm__
__volatile__("addl %1,%0" : "+m" (*v
) : "di" (i
));
30 static __inline__
void atomic_sub(int i
, atomic_t
*v
)
32 #ifdef CONFIG_COLDFIRE
33 __asm__
__volatile__("subl %1,%0" : "+m" (*v
) : "d" (i
));
35 __asm__
__volatile__("subl %1,%0" : "+m" (*v
) : "di" (i
));
39 static __inline__
int atomic_sub_and_test(int i
, atomic_t
* v
)
42 #ifdef CONFIG_COLDFIRE
43 __asm__
__volatile__("subl %2,%1; seq %0"
47 __asm__
__volatile__("subl %2,%1; seq %0"
54 static __inline__
void atomic_inc(volatile atomic_t
*v
)
56 __asm__
__volatile__("addql #1,%0" : "+m" (*v
));
60 * atomic_inc_and_test - increment and test
61 * @v: pointer of type atomic_t
63 * Atomically increments @v by 1
64 * and returns true if the result is zero, or false for all
68 static __inline__
int atomic_inc_and_test(volatile atomic_t
*v
)
71 __asm__
__volatile__("addql #1,%1; seq %0" : "=d" (c
), "+m" (*v
));
75 static __inline__
void atomic_dec(volatile atomic_t
*v
)
77 __asm__
__volatile__("subql #1,%0" : "+m" (*v
));
80 static __inline__
int atomic_dec_and_test(volatile atomic_t
*v
)
83 __asm__
__volatile__("subql #1,%1; seq %0" : "=d" (c
), "+m" (*v
));
87 static __inline__
void atomic_clear_mask(unsigned long mask
, unsigned long *v
)
89 __asm__
__volatile__("andl %1,%0" : "+m" (*v
) : "id" (~(mask
)));
92 static __inline__
void atomic_set_mask(unsigned long mask
, unsigned long *v
)
94 __asm__
__volatile__("orl %1,%0" : "+m" (*v
) : "id" (mask
));
97 /* Atomic operations are already serializing */
98 #define smp_mb__before_atomic_dec() barrier()
99 #define smp_mb__after_atomic_dec() barrier()
100 #define smp_mb__before_atomic_inc() barrier()
101 #define smp_mb__after_atomic_inc() barrier()
103 static inline int atomic_add_return(int i
, atomic_t
* v
)
105 unsigned long temp
, flags
;
107 local_irq_save(flags
);
111 local_irq_restore(flags
);
116 #define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0)
118 static inline int atomic_sub_return(int i
, atomic_t
* v
)
120 unsigned long temp
, flags
;
122 local_irq_save(flags
);
126 local_irq_restore(flags
);
131 #define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n)))
133 #define atomic_add_unless(v, a, u) \
136 c = atomic_read(v); \
137 while (c != (u) && (old = atomic_cmpxchg((v), c, c + (a))) != c) \
141 #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
143 #define atomic_dec_return(v) atomic_sub_return(1,(v))
144 #define atomic_inc_return(v) atomic_add_return(1,(v))
146 #endif /* __ARCH_M68KNOMMU_ATOMIC __ */
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