1
#ifndef __ARCH_H8300_ATOMIC__
2
#define __ARCH_H8300_ATOMIC__
4
#include <linux/types.h>
7
* Atomic operations that C can't guarantee us. Useful for
8
* resource counting etc..
11
#define ATOMIC_INIT(i) { (i) }
13
#define atomic_read(v) (*(volatile int *)&(v)->counter)
14
#define atomic_set(v, i) (((v)->counter) = i)
16
#include <asm/system.h>
17
#include <linux/kernel.h>
19
static __inline__ int atomic_add_return(int i, atomic_t *v)
23
local_irq_save(flags);
24
ret = v->counter += i;
25
local_irq_restore(flags);
29
#define atomic_add(i, v) atomic_add_return(i, v)
30
#define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0)
32
static __inline__ int atomic_sub_return(int i, atomic_t *v)
36
local_irq_save(flags);
37
ret = v->counter -= i;
38
local_irq_restore(flags);
42
#define atomic_sub(i, v) atomic_sub_return(i, v)
43
#define atomic_sub_and_test(i,v) (atomic_sub_return(i, v) == 0)
45
static __inline__ int atomic_inc_return(atomic_t *v)
49
local_irq_save(flags);
52
local_irq_restore(flags);
56
#define atomic_inc(v) atomic_inc_return(v)
59
* atomic_inc_and_test - increment and test
60
* @v: pointer of type atomic_t
62
* Atomically increments @v by 1
63
* and returns true if the result is zero, or false for all
66
#define atomic_inc_and_test(v) (atomic_inc_return(v) == 0)
68
static __inline__ int atomic_dec_return(atomic_t *v)
72
local_irq_save(flags);
75
local_irq_restore(flags);
79
#define atomic_dec(v) atomic_dec_return(v)
81
static __inline__ int atomic_dec_and_test(atomic_t *v)
85
local_irq_save(flags);
88
local_irq_restore(flags);
92
static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
97
local_irq_save(flags);
99
if (likely(ret == old))
101
local_irq_restore(flags);
105
#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
107
static inline int __atomic_add_unless(atomic_t *v, int a, int u)
112
local_irq_save(flags);
116
local_irq_restore(flags);
120
static __inline__ void atomic_clear_mask(unsigned long mask, unsigned long *v)
122
__asm__ __volatile__("stc ccr,r1l\n\t"
128
: "=m" (*v) : "g" (~(mask)) :"er0","er1");
131
static __inline__ void atomic_set_mask(unsigned long mask, unsigned long *v)
133
__asm__ __volatile__("stc ccr,r1l\n\t"
139
: "=m" (*v) : "g" (mask) :"er0","er1");
142
/* Atomic operations are already serializing */
143
#define smp_mb__before_atomic_dec() barrier()
144
#define smp_mb__after_atomic_dec() barrier()
145
#define smp_mb__before_atomic_inc() barrier()
146
#define smp_mb__after_atomic_inc() barrier()
148
#endif /* __ARCH_H8300_ATOMIC __ */