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 #ifdef CONFIG_COLDFIRE
23 static __inline__ void atomic_add(int i, atomic_t *v)
33 static __inline__ void atomic_sub(int i, atomic_t *v)
45 static __inline__ void atomic_add(int i, atomic_t *v)
47 __asm__ __volatile__("addl %1,%0" : "=m" (*v) : "d" (i), "0" (*v));
50 static __inline__ void atomic_sub(int i, atomic_t *v)
52 __asm__ __volatile__("subl %1,%0" : "=m" (*v) : "d" (i), "0" (*v));
57 static __inline__ void atomic_inc(volatile atomic_t *v)
59 __asm__ __volatile__("addql #1,%0" : "=m" (*v): "0" (*v));
62 static __inline__ void atomic_dec(volatile atomic_t *v)
64 __asm__ __volatile__("subql #1,%0" : "=m" (*v): "0" (*v));
67 static __inline__ int atomic_dec_and_test(volatile atomic_t *v)
70 __asm__ __volatile__("subql #1,%1; seq %0" : "=d" (c), "=m" (*v): "1" (*v));
74 #define atomic_clear_mask(mask, v) \
75 __asm__ __volatile__("andl %1,%0" : "=m" (*v) : "id" (~(mask)),"0"(*v))
77 #define atomic_set_mask(mask, v) \
78 __asm__ __volatile__("orl %1,%0" : "=m" (*v) : "id" (mask),"0"(*v))
80 /* Atomic operations are already serializing */
81 #define smp_mb__before_atomic_dec() barrier()
82 #define smp_mb__after_atomic_dec() barrier()
83 #define smp_mb__before_atomic_inc() barrier()
84 #define smp_mb__after_atomic_inc() barrier()
86 extern __inline__ int atomic_add_return(int i, atomic_t * v)
88 unsigned long temp, flags;
90 local_irq_save(flags);
94 local_irq_restore(flags);
99 extern __inline__ int atomic_sub_return(int i, atomic_t * v)
101 unsigned long temp, flags;
103 local_irq_save(flags);
107 local_irq_restore(flags);
112 #define atomic_dec_return(v) atomic_sub_return(1,(v))
113 #define atomic_inc_return(v) atomic_add_return(1,(v))
115 #define atomic_sub_and_test(i,v) (atomic_sub_return((i), (v)) == 0)
116 #define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0)
118 #endif /* __ARCH_M68KNOMMU_ATOMIC __ */