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| /*
| * PowerPC atomic operations
| */
|
| #ifndef _ASM_PPC_ATOMIC_H_
| #define _ASM_PPC_ATOMIC_H_
|
| #ifdef CONFIG_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_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)
| : "r" (a), "r" (v), "m" (*v)
| : "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)
| : "r" (a), "r" (v), "m" (*v)
| : "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)
| : "r" (v), "m" (*v)
| : "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)
| : "r" (v), "m" (*v)
| : "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_ */
|
|
