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#ifndef __ARCH_M68KNOMMU_ATOMIC__
#define __ARCH_M68KNOMMU_ATOMIC__
#include <asm/system.h>
/*
* 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)
{
#ifdef CONFIG_COLDFIRE
__asm__ __volatile__("addl %1,%0" : "+m" (*v) : "d" (i));
#else
__asm__ __volatile__("addl %1,%0" : "+m" (*v) : "di" (i));
#endif
}
static __inline__ void atomic_sub(int i, atomic_t *v)
{
#ifdef CONFIG_COLDFIRE
__asm__ __volatile__("subl %1,%0" : "+m" (*v) : "d" (i));
#else
__asm__ __volatile__("subl %1,%0" : "+m" (*v) : "di" (i));
#endif
}
static __inline__ int atomic_sub_and_test(int i, atomic_t * v)
{
char c;
#ifdef CONFIG_COLDFIRE
__asm__ __volatile__("subl %2,%1; seq %0"
: "=d" (c), "+m" (*v)
: "d" (i));
#else
__asm__ __volatile__("subl %2,%1; seq %0"
: "=d" (c), "+m" (*v)
: "di" (i));
#endif
return c != 0;
}
static __inline__ void atomic_inc(volatile atomic_t *v)
{
__asm__ __volatile__("addql #1,%0" : "+m" (*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.
*/
static __inline__ int atomic_inc_and_test(volatile atomic_t *v)
{
char c;
__asm__ __volatile__("addql #1,%1; seq %0" : "=d" (c), "+m" (*v));
return c != 0;
}
static __inline__ void atomic_dec(volatile atomic_t *v)
{
__asm__ __volatile__("subql #1,%0" : "+m" (*v));
}
static __inline__ int atomic_dec_and_test(volatile atomic_t *v)
{
char c;
__asm__ __volatile__("subql #1,%1; seq %0" : "=d" (c), "+m" (*v));
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));
}
/* 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()
static inline int atomic_add_return(int i, atomic_t * v)
{
unsigned long temp, flags;
local_irq_save(flags);
temp = *(long *)v;
temp += i;
*(long *)v = temp;
local_irq_restore(flags);
return temp;
}
#define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0)
static inline int atomic_sub_return(int i, atomic_t * v)
{
unsigned long temp, flags;
local_irq_save(flags);
temp = *(long *)v;
temp -= i;
*(long *)v = temp;
local_irq_restore(flags);
return temp;
}
#define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n)))
#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
static __inline__ int atomic_add_unless(atomic_t *v, int a, int 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;
}
return c != (u);
}
#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
#define atomic_dec_return(v) atomic_sub_return(1,(v))
#define atomic_inc_return(v) atomic_add_return(1,(v))
#include <asm-generic/atomic.h>
#endif /* __ARCH_M68KNOMMU_ATOMIC __ */
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