131 lines
2.9 KiB
C
131 lines
2.9 KiB
C
/*
|
|
* 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__ */
|