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#ifndef __ARCH_M68K_ATOMIC__
#define __ARCH_M68K_ATOMIC__
#include <asm/system.h> /* local_irq_XXX() */
/*
* Atomic operations that C can't guarantee us. Useful for
* resource counting etc..
*/
/*
* We do not have SMP m68k systems, so we don't have to deal with that.
*/
typedef struct { int counter; } atomic_t;
#define ATOMIC_INIT(i) { (i) }
#define atomic_read(v) ((v)->counter)
#define atomic_set(v, i) (((v)->counter) = i)
static inline void atomic_add(int i, atomic_t *v)
{
__asm__ __volatile__("addl %1,%0" : "+m" (*v) : "id" (i));
}
static inline void atomic_sub(int i, atomic_t *v)
{
__asm__ __volatile__("subl %1,%0" : "+m" (*v) : "id" (i));
}
static inline void atomic_inc(atomic_t *v)
{
__asm__ __volatile__("addql #1,%0" : "+m" (*v));
}
static inline void atomic_dec(atomic_t *v)
{
__asm__ __volatile__("subql #1,%0" : "+m" (*v));
}
static inline int atomic_dec_and_test(atomic_t *v)
{
char c;
__asm__ __volatile__("subql #1,%1; seq %0" : "=d" (c), "+m" (*v));
return c != 0;
}
static inline int atomic_inc_and_test(atomic_t *v)
{
char c;
__asm__ __volatile__("addql #1,%1; seq %0" : "=d" (c), "+m" (*v));
return c != 0;
}
#ifdef CONFIG_RMW_INSNS
static inline int atomic_add_return(int i, atomic_t *v)
{
int t, tmp;
__asm__ __volatile__(
"1: movel %2,%1\n"
" addl %3,%1\n"
" casl %2,%1,%0\n"
" jne 1b"
: "+m" (*v), "=&d" (t), "=&d" (tmp)
: "g" (i), "2" (atomic_read(v)));
return t;
}
static inline int atomic_sub_return(int i, atomic_t *v)
{
int t, tmp;
__asm__ __volatile__(
"1: movel %2,%1\n"
" subl %3,%1\n"
" casl %2,%1,%0\n"
" jne 1b"
: "+m" (*v), "=&d" (t), "=&d" (tmp)
: "g" (i), "2" (atomic_read(v)));
return t;
}
#define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n)))
#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
#else /* !CONFIG_RMW_INSNS */
static inline int atomic_add_return(int i, atomic_t * v)
{
unsigned long flags;
int t;
local_irq_save(flags);
t = atomic_read(v);
t += i;
atomic_set(v, t);
local_irq_restore(flags);
return t;
}
static inline int atomic_sub_return(int i, atomic_t * v)
{
unsigned long flags;
int t;
local_irq_save(flags);
t = atomic_read(v);
t -= i;
atomic_set(v, t);
local_irq_restore(flags);
return t;
}
static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
{
unsigned long flags;
int prev;
local_irq_save(flags);
prev = atomic_read(v);
if (prev == old)
atomic_set(v, new);
local_irq_restore(flags);
return prev;
}
static inline int atomic_xchg(atomic_t *v, int new)
{
unsigned long flags;
int prev;
local_irq_save(flags);
prev = atomic_read(v);
atomic_set(v, new);
local_irq_restore(flags);
return prev;
}
#endif /* !CONFIG_RMW_INSNS */
#define atomic_dec_return(v) atomic_sub_return(1, (v))
#define atomic_inc_return(v) atomic_add_return(1, (v))
static inline int atomic_sub_and_test(int i, atomic_t *v)
{
char c;
__asm__ __volatile__("subl %2,%1; seq %0" : "=d" (c), "+m" (*v): "g" (i));
return c != 0;
}
static inline int atomic_add_negative(int i, atomic_t *v)
{
char c;
__asm__ __volatile__("addl %2,%1; smi %0" : "=d" (c), "+m" (*v): "g" (i));
return c != 0;
}
static inline void atomic_clear_mask(unsigned long mask, unsigned long *v)
{
__asm__ __volatile__("andl %1,%0" : "+m" (*v) : "id" (~(mask)));
}
static inline void atomic_set_mask(unsigned long mask, unsigned long *v)
{
__asm__ __volatile__("orl %1,%0" : "+m" (*v) : "id" (mask));
}
#define atomic_add_unless(v, a, u) \
({ \
int c, old; \
c = atomic_read(v); \
for (;;) { \
if (unlikely(c == (u))) \
break; \
old = atomic_cmpxchg((v), c, c + (a)); \
if (likely(old == c)) \
break; \
c = old; \
} \
c != (u); \
})
#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
/* 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 /* __ARCH_M68K_ATOMIC __ */
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