/* * PowerPC atomic operations */ #ifndef _ASM_PPC_ATOMIC_H_ #define _ASM_PPC_ATOMIC_H_ #include <linux/config.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); extern __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; } extern __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; } extern __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; } extern __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_ */