atomic.h
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#ifndef __ARCH_H8300_ATOMIC__
#define __ARCH_H8300_ATOMIC__
#include <linux/types.h>
#include <asm/cmpxchg.h>
/*
* Atomic operations that C can't guarantee us. Useful for
* resource counting etc..
*/
#define ATOMIC_INIT(i) { (i) }
#define atomic_read(v) READ_ONCE((v)->counter)
#define atomic_set(v, i) WRITE_ONCE(((v)->counter), (i))
#include <linux/kernel.h>
#define ATOMIC_OP_RETURN(op, c_op) \
static inline int atomic_##op##_return(int i, atomic_t *v) \
{ \
h8300flags flags; \
int ret; \
\
flags = arch_local_irq_save(); \
ret = v->counter c_op i; \
arch_local_irq_restore(flags); \
return ret; \
}
#define ATOMIC_OP(op, c_op) \
static inline void atomic_##op(int i, atomic_t *v) \
{ \
h8300flags flags; \
\
flags = arch_local_irq_save(); \
v->counter c_op i; \
arch_local_irq_restore(flags); \
}
ATOMIC_OP_RETURN(add, +=)
ATOMIC_OP_RETURN(sub, -=)
ATOMIC_OP(and, &=)
ATOMIC_OP(or, |=)
ATOMIC_OP(xor, ^=)
#undef ATOMIC_OP_RETURN
#undef ATOMIC_OP
#define atomic_add(i, v) (void)atomic_add_return(i, v)
#define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0)
#define atomic_sub(i, v) (void)atomic_sub_return(i, v)
#define atomic_sub_and_test(i, v) (atomic_sub_return(i, v) == 0)
#define atomic_inc_return(v) atomic_add_return(1, v)
#define atomic_dec_return(v) atomic_sub_return(1, v)
#define atomic_inc(v) (void)atomic_inc_return(v)
#define atomic_inc_and_test(v) (atomic_inc_return(v) == 0)
#define atomic_dec(v) (void)atomic_dec_return(v)
#define atomic_dec_and_test(v) (atomic_dec_return(v) == 0)
static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
{
int ret;
h8300flags flags;
flags = arch_local_irq_save();
ret = v->counter;
if (likely(ret == old))
v->counter = new;
arch_local_irq_restore(flags);
return ret;
}
static inline int __atomic_add_unless(atomic_t *v, int a, int u)
{
int ret;
h8300flags flags;
flags = arch_local_irq_save();
ret = v->counter;
if (ret != u)
v->counter += a;
arch_local_irq_restore(flags);
return ret;
}
#endif /* __ARCH_H8300_ATOMIC __ */