1/* atomic.h: Thankfully the V9 is at least reasonable for this 2 * stuff. 3 * 4 * Copyright (C) 1996, 1997, 2000 David S. Miller (davem@redhat.com) 5 */ 6 7#ifndef __ARCH_SPARC64_ATOMIC__ 8#define __ARCH_SPARC64_ATOMIC__ 9 10#include <linux/types.h> 11#include <asm/system.h> 12 13#define ATOMIC_INIT(i) { (i) } 14#define ATOMIC64_INIT(i) { (i) } 15 16#define atomic_read(v) (*(volatile int *)&(v)->counter) 17#define atomic64_read(v) (*(volatile long *)&(v)->counter) 18 19#define atomic_set(v, i) (((v)->counter) = i) 20#define atomic64_set(v, i) (((v)->counter) = i) 21 22extern void atomic_add(int, atomic_t *); 23extern void atomic64_add(long, atomic64_t *); 24extern void atomic_sub(int, atomic_t *); 25extern void atomic64_sub(long, atomic64_t *); 26 27extern int atomic_add_ret(int, atomic_t *); 28extern long atomic64_add_ret(long, atomic64_t *); 29extern int atomic_sub_ret(int, atomic_t *); 30extern long atomic64_sub_ret(long, atomic64_t *); 31 32#define atomic_dec_return(v) atomic_sub_ret(1, v) 33#define atomic64_dec_return(v) atomic64_sub_ret(1, v) 34 35#define atomic_inc_return(v) atomic_add_ret(1, v) 36#define atomic64_inc_return(v) atomic64_add_ret(1, v) 37 38#define atomic_sub_return(i, v) atomic_sub_ret(i, v) 39#define atomic64_sub_return(i, v) atomic64_sub_ret(i, v) 40 41#define atomic_add_return(i, v) atomic_add_ret(i, v) 42#define atomic64_add_return(i, v) atomic64_add_ret(i, v) 43 44/* 45 * atomic_inc_and_test - increment and test 46 * @v: pointer of type atomic_t 47 * 48 * Atomically increments @v by 1 49 * and returns true if the result is zero, or false for all 50 * other cases. 51 */ 52#define atomic_inc_and_test(v) (atomic_inc_return(v) == 0) 53#define atomic64_inc_and_test(v) (atomic64_inc_return(v) == 0) 54 55#define atomic_sub_and_test(i, v) (atomic_sub_ret(i, v) == 0) 56#define atomic64_sub_and_test(i, v) (atomic64_sub_ret(i, v) == 0) 57 58#define atomic_dec_and_test(v) (atomic_sub_ret(1, v) == 0) 59#define atomic64_dec_and_test(v) (atomic64_sub_ret(1, v) == 0) 60 61#define atomic_inc(v) atomic_add(1, v) 62#define atomic64_inc(v) atomic64_add(1, v) 63 64#define atomic_dec(v) atomic_sub(1, v) 65#define atomic64_dec(v) atomic64_sub(1, v) 66 67#define atomic_add_negative(i, v) (atomic_add_ret(i, v) < 0) 68#define atomic64_add_negative(i, v) (atomic64_add_ret(i, v) < 0) 69 70#define atomic_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n))) 71#define atomic_xchg(v, new) (xchg(&((v)->counter), new)) 72 73static inline int atomic_add_unless(atomic_t *v, int a, int u) 74{ 75 int c, old; 76 c = atomic_read(v); 77 for (;;) { 78 if (unlikely(c == (u))) 79 break; 80 old = atomic_cmpxchg((v), c, c + (a)); 81 if (likely(old == c)) 82 break; 83 c = old; 84 } 85 return c != (u); 86} 87 88#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0) 89 90#define atomic64_cmpxchg(v, o, n) \ 91 ((__typeof__((v)->counter))cmpxchg(&((v)->counter), (o), (n))) 92#define atomic64_xchg(v, new) (xchg(&((v)->counter), new)) 93 94static inline long atomic64_add_unless(atomic64_t *v, long a, long u) 95{ 96 long c, old; 97 c = atomic64_read(v); 98 for (;;) { 99 if (unlikely(c == (u))) 100 break; 101 old = atomic64_cmpxchg((v), c, c + (a)); 102 if (likely(old == c)) 103 break; 104 c = old; 105 } 106 return c != (u); 107} 108 109#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0) 110 111/* Atomic operations are already serializing */ 112#define smp_mb__before_atomic_dec() barrier() 113#define smp_mb__after_atomic_dec() barrier() 114#define smp_mb__before_atomic_inc() barrier() 115#define smp_mb__after_atomic_inc() barrier() 116 117#include <asm-generic/atomic-long.h> 118#endif /* !(__ARCH_SPARC64_ATOMIC__) */ 119