/* * include/asm-v850/atomic.h -- Atomic operations * *  Copyright (C) 2001,02  NEC Corporation *  Copyright (C) 2001,02  Miles Bader <miles@gnu.org> * * This file is subject to the terms and conditions of the GNU General * Public License.  See the file COPYING in the main directory of this * archive for more details. * * Written by Miles Bader <miles@gnu.org> */ #ifndef __V850_ATOMIC_H__#define __V850_ATOMIC_H__  #include <asm/system.h> #ifdef CONFIG_SMP#error SMP not supported#endif typedef struct { int counter; } atomic_t; #define ATOMIC_INIT(i)	{ (i) } #ifdef __KERNEL__ #define atomic_read(v)		((v)->counter)#define atomic_set(v,i)		(((v)->counter) = (i)) static inline int atomic_add_return (int i, volatile atomic_t *v){	unsigned long flags;	int res; 	local_irq_save (flags);	res = v->counter + i;	v->counter = res;	local_irq_restore (flags); 	return res;} static __inline__ int atomic_sub_return (int i, volatile atomic_t *v){	unsigned long flags;	int res; 	local_irq_save (flags);	res = v->counter - i;	v->counter = res;	local_irq_restore (flags); 	return res;} static __inline__ void atomic_clear_mask (unsigned long mask, unsigned long *addr){	unsigned long flags; 	local_irq_save (flags);	*addr &= ~mask;	local_irq_restore (flags);} #endif #define atomic_add(i, v)	atomic_add_return ((i), (v))#define atomic_sub(i, v)	atomic_sub_return ((i), (v)) #define atomic_dec_return(v)	atomic_sub_return (1, (v))#define atomic_inc_return(v)	atomic_add_return (1, (v))#define atomic_inc(v) 		atomic_inc_return (v)#define atomic_dec(v) 		atomic_dec_return (v) /* * atomic_inc_and_test - increment and test * @v: pointer of type atomic_t * * Atomically increments @v by 1 * and returns true if the result is zero, or false for all * other cases. */#define atomic_inc_and_test(v) (atomic_inc_return(v) == 0) #define atomic_sub_and_test(i,v)	(atomic_sub_return ((i), (v)) == 0)#define atomic_dec_and_test(v)		(atomic_sub_return (1, (v)) == 0)#define atomic_add_negative(i,v)	(atomic_add_return ((i), (v)) < 0) static inline int atomic_cmpxchg(atomic_t *v, int old, int new){	int ret;	unsigned long flags; 	local_irq_save(flags);	ret = v->counter;	if (likely(ret == old))		v->counter = new;	local_irq_restore(flags); 	return ret;} #define atomic_xchg(v, new) (xchg(&((v)->counter), new)) static inline int atomic_add_unless(atomic_t *v, int a, int u){	int ret;	unsigned long flags; 	local_irq_save(flags);	ret = v->counter;	if (ret != u)		v->counter += a;	local_irq_restore(flags); 	return ret != u;} #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0) /* Atomic operations are already serializing on ARM */#define smp_mb__before_atomic_dec()	barrier()#define smp_mb__after_atomic_dec()	barrier()#define smp_mb__before_atomic_inc()	barrier()#define smp_mb__after_atomic_inc()	barrier() #include <asm-generic/atomic.h>#endif /* __V850_ATOMIC_H__ */