124 lines
2.9 KiB
C
124 lines
2.9 KiB
C
/*
|
|
* Copyright (C) 2006 Atmark Techno, Inc.
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#ifndef _ASM_MICROBLAZE_ATOMIC_H
|
|
#define _ASM_MICROBLAZE_ATOMIC_H
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/compiler.h> /* likely */
|
|
#include <asm/system.h> /* local_irq_XXX and friends */
|
|
|
|
#define ATOMIC_INIT(i) { (i) }
|
|
#define atomic_read(v) ((v)->counter)
|
|
#define atomic_set(v, i) (((v)->counter) = (i))
|
|
|
|
#define atomic_inc(v) (atomic_add_return(1, (v)))
|
|
#define atomic_dec(v) (atomic_sub_return(1, (v)))
|
|
|
|
#define atomic_add(i, v) (atomic_add_return(i, (v)))
|
|
#define atomic_sub(i, v) (atomic_sub_return(i, (v)))
|
|
|
|
#define atomic_inc_return(v) (atomic_add_return(1, (v)))
|
|
#define atomic_dec_return(v) (atomic_sub_return(1, (v)))
|
|
|
|
#define atomic_inc_and_test(v) (atomic_add_return(1, (v)) == 0)
|
|
#define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0)
|
|
|
|
#define atomic_inc_not_zero(v) (atomic_add_unless((v), 1, 0))
|
|
|
|
#define atomic_sub_and_test(i, v) (atomic_sub_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;
|
|
}
|
|
|
|
static inline int atomic_add_unless(atomic_t *v, int a, int u)
|
|
{
|
|
int c, old;
|
|
|
|
c = atomic_read(v);
|
|
while (c != u && (old = atomic_cmpxchg((v), c, c + a)) != c)
|
|
c = old;
|
|
return c != u;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
/**
|
|
* atomic_add_return - add and return
|
|
* @i: integer value to add
|
|
* @v: pointer of type atomic_t
|
|
*
|
|
* Atomically adds @i to @v and returns @i + @v
|
|
*/
|
|
static inline int atomic_add_return(int i, atomic_t *v)
|
|
{
|
|
unsigned long flags;
|
|
int val;
|
|
|
|
local_irq_save(flags);
|
|
val = v->counter;
|
|
v->counter = val += i;
|
|
local_irq_restore(flags);
|
|
|
|
return val;
|
|
}
|
|
|
|
static inline int atomic_sub_return(int i, atomic_t *v)
|
|
{
|
|
return atomic_add_return(-i, v);
|
|
}
|
|
|
|
/*
|
|
* Atomically test *v and decrement if it is greater than 0.
|
|
* The function returns the old value of *v minus 1.
|
|
*/
|
|
static inline int atomic_dec_if_positive(atomic_t *v)
|
|
{
|
|
unsigned long flags;
|
|
int res;
|
|
|
|
local_irq_save(flags);
|
|
res = v->counter - 1;
|
|
if (res >= 0)
|
|
v->counter = res;
|
|
local_irq_restore(flags);
|
|
|
|
return res;
|
|
}
|
|
|
|
#define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0)
|
|
#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
|
|
|
|
/* Atomic operations are already serializing */
|
|
#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 /* _ASM_MICROBLAZE_ATOMIC_H */
|