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/*
* PowerPC atomic operations
*/
#ifndef _ASM_PPC_ATOMIC_H_
#define _ASM_PPC_ATOMIC_H_
typedef struct { volatile int counter; } atomic_t;
#define ATOMIC_INIT(i) { (i) }
#define atomic_read(v) ((v)->counter)
#define atomic_set(v,i) (((v)->counter) = (i))
extern void atomic_clear_mask(unsigned long mask, unsigned long *addr);
extern void atomic_set_mask(unsigned long mask, unsigned long *addr);
static __inline__ int atomic_add_return(int a, atomic_t *v)
{
int t;
__asm__ __volatile__("\n\
1: lwarx %0,0,%3\n\
add %0,%2,%0\n\
stwcx. %0,0,%3\n\
bne- 1b"
: "=&r" (t), "=m" (v->counter)
: "r" (a), "r" (v), "m" (v->counter)
: "cc");
return t;
}
static __inline__ int atomic_sub_return(int a, atomic_t *v)
{
int t;
__asm__ __volatile__("\n\
1: lwarx %0,0,%3\n\
subf %0,%2,%0\n\
stwcx. %0,0,%3\n\
bne- 1b"
: "=&r" (t), "=m" (v->counter)
: "r" (a), "r" (v), "m" (v->counter)
: "cc");
return t;
}
static __inline__ int atomic_inc_return(atomic_t *v)
{
int t;
__asm__ __volatile__("\n\
1: lwarx %0,0,%2\n\
addic %0,%0,1\n\
stwcx. %0,0,%2\n\
bne- 1b"
: "=&r" (t), "=m" (v->counter)
: "r" (v), "m" (v->counter)
: "cc");
return t;
}
static __inline__ int atomic_dec_return(atomic_t *v)
{
int t;
__asm__ __volatile__("\n\
1: lwarx %0,0,%2\n\
addic %0,%0,-1\n\
stwcx. %0,0,%2\n\
bne 1b"
: "=&r" (t), "=m" (v->counter)
: "r" (v), "m" (v->counter)
: "cc");
return t;
}
#define atomic_add(a, v) ((void) atomic_add_return((a), (v)))
#define atomic_sub(a, v) ((void) atomic_sub_return((a), (v)))
#define atomic_sub_and_test(a, v) (atomic_sub_return((a), (v)) == 0)
#define atomic_inc(v) ((void) atomic_inc_return((v)))
#define atomic_dec(v) ((void) atomic_dec_return((v)))
#define atomic_dec_and_test(v) (atomic_dec_return((v)) == 0)
#endif /* _ASM_PPC_ATOMIC_H_ */
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