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/*
* PowerPC atomic operations
*/
#ifndef _ASM_PPC_ATOMIC_H_
#define _ASM_PPC_ATOMIC_H_
#ifdef __SMP__
typedef struct { volatile int counter; } atomic_t;
#else
typedef struct { int counter; } atomic_t;
#endif
#define ATOMIC_INIT(i) { (i) }
#define atomic_read(v) ((v)->counter)
#define atomic_set(v,i) (((v)->counter) = (i))
extern void atomic_add(int a, atomic_t *v);
extern void atomic_sub(int a, atomic_t *v);
extern void atomic_inc(atomic_t *v);
extern int atomic_inc_return(atomic_t *v);
extern void atomic_dec(atomic_t *v);
extern int atomic_dec_return(atomic_t *v);
extern int atomic_dec_and_test(atomic_t *v);
extern void atomic_clear_mask(unsigned long mask, unsigned long *addr);
extern void atomic_set_mask(unsigned long mask, unsigned long *addr);
#if 0 /* for now */
extern __inline__ void atomic_add(atomic_t a, atomic_t *v)
{
atomic_t 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)
: "r" (a), "r" (v)
: "cc");
}
extern __inline__ void atomic_sub(atomic_t a, atomic_t *v)
{
atomic_t 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)
: "r" (a), "r" (v)
: "cc");
}
extern __inline__ int atomic_sub_and_test(atomic_t a, atomic_t *v)
{
atomic_t 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)
: "r" (a), "r" (v)
: "cc");
return t == 0;
}
extern __inline__ void atomic_inc(atomic_t *v)
{
atomic_t 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)
: "r" (v)
: "cc");
}
extern __inline__ void atomic_dec(atomic_t *v)
{
atomic_t 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)
: "r" (v)
: "cc");
}
extern __inline__ int atomic_dec_and_test(atomic_t *v)
{
atomic_t 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)
: "r" (v)
: "cc");
return t == 0;
}
#endif /* 0 */
#endif /* _ASM_PPC_ATOMIC_H_ */
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