1/* $Id: atomic.h,v 1.1.1.1 2007/08/03 18:53:36 Exp $ 2 * atomic.h: Thankfully the V9 is at least reasonable for this 3 * stuff. 4 * 5 * Copyright (C) 1996, 1997, 2000 David S. Miller (davem@redhat.com) 6 */ 7 8#ifndef __ARCH_SPARC64_ATOMIC__ 9#define __ARCH_SPARC64_ATOMIC__ 10 11#include <linux/types.h> 12#include <asm/system.h> 13 14typedef struct { volatile int counter; } atomic_t; 15typedef struct { volatile __s64 counter; } atomic64_t; 16 17#define ATOMIC_INIT(i) { (i) } 18#define ATOMIC64_INIT(i) { (i) } 19 20#define atomic_read(v) ((v)->counter) 21#define atomic64_read(v) ((v)->counter) 22 23#define atomic_set(v, i) (((v)->counter) = i) 24#define atomic64_set(v, i) (((v)->counter) = i) 25 26extern void atomic_add(int, atomic_t *); 27extern void atomic64_add(int, atomic64_t *); 28extern void atomic_sub(int, atomic_t *); 29extern void atomic64_sub(int, atomic64_t *); 30 31extern int atomic_add_ret(int, atomic_t *); 32extern int atomic64_add_ret(int, atomic64_t *); 33extern int atomic_sub_ret(int, atomic_t *); 34extern int atomic64_sub_ret(int, atomic64_t *); 35 36#define atomic_dec_return(v) atomic_sub_ret(1, v) 37#define atomic64_dec_return(v) atomic64_sub_ret(1, v) 38 39#define atomic_inc_return(v) atomic_add_ret(1, v) 40#define atomic64_inc_return(v) atomic64_add_ret(1, v) 41 42#define atomic_sub_return(i, v) atomic_sub_ret(i, v) 43#define atomic64_sub_return(i, v) atomic64_sub_ret(i, v) 44 45#define atomic_add_return(i, v) atomic_add_ret(i, v) 46#define atomic64_add_return(i, v) atomic64_add_ret(i, v) 47 48/* 49 * atomic_inc_and_test - increment and test 50 * @v: pointer of type atomic_t 51 * 52 * Atomically increments @v by 1 53 * and returns true if the result is zero, or false for all 54 * other cases. 55 */ 56#define atomic_inc_and_test(v) (atomic_inc_return(v) == 0) 57#define atomic64_inc_and_test(v) (atomic64_inc_return(v) == 0) 58 59#define atomic_sub_and_test(i, v) (atomic_sub_ret(i, v) == 0) 60#define atomic64_sub_and_test(i, v) (atomic64_sub_ret(i, v) == 0) 61 62#define atomic_dec_and_test(v) (atomic_sub_ret(1, v) == 0) 63#define atomic64_dec_and_test(v) (atomic64_sub_ret(1, v) == 0) 64 65#define atomic_inc(v) atomic_add(1, v) 66#define atomic64_inc(v) atomic64_add(1, v) 67 68#define atomic_dec(v) atomic_sub(1, v) 69#define atomic64_dec(v) atomic64_sub(1, v) 70 71#define atomic_add_negative(i, v) (atomic_add_ret(i, v) < 0) 72#define atomic64_add_negative(i, v) (atomic64_add_ret(i, v) < 0) 73 74#define atomic_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n))) 75#define atomic_xchg(v, new) (xchg(&((v)->counter), new)) 76 77static __inline__ int atomic_add_unless(atomic_t *v, int a, int u) 78{ 79 int c, old; 80 c = atomic_read(v); 81 for (;;) { 82 if (unlikely(c == (u))) 83 break; 84 old = atomic_cmpxchg((v), c, c + (a)); 85 if (likely(old == c)) 86 break; 87 c = old; 88 } 89 return c != (u); 90} 91 92#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0) 93 94#define atomic64_cmpxchg(v, o, n) \ 95 ((__typeof__((v)->counter))cmpxchg(&((v)->counter), (o), (n))) 96#define atomic64_xchg(v, new) (xchg(&((v)->counter), new)) 97 98static __inline__ int atomic64_add_unless(atomic64_t *v, long a, long u) 99{ 100 long c, old; 101 c = atomic64_read(v); 102 for (;;) { 103 if (unlikely(c == (u))) 104 break; 105 old = atomic64_cmpxchg((v), c, c + (a)); 106 if (likely(old == c)) 107 break; 108 c = old; 109 } 110 return c != (u); 111} 112 113#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0) 114 115/* Atomic operations are already serializing */ 116#ifdef CONFIG_SMP 117#define smp_mb__before_atomic_dec() membar_storeload_loadload(); 118#define smp_mb__after_atomic_dec() membar_storeload_storestore(); 119#define smp_mb__before_atomic_inc() membar_storeload_loadload(); 120#define smp_mb__after_atomic_inc() membar_storeload_storestore(); 121#else 122#define smp_mb__before_atomic_dec() barrier() 123#define smp_mb__after_atomic_dec() barrier() 124#define smp_mb__before_atomic_inc() barrier() 125#define smp_mb__after_atomic_inc() barrier() 126#endif 127 128#include <asm-generic/atomic.h> 129#endif /* !(__ARCH_SPARC64_ATOMIC__) */ 130