/arch/ia64/include/asm/atomic.h
C++ Header | 220 lines | 172 code | 32 blank | 16 comment | 90 complexity | f857dedc6f4b38f101980e929be5801c MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
1#ifndef _ASM_IA64_ATOMIC_H 2#define _ASM_IA64_ATOMIC_H 3 4/* 5 * Atomic operations that C can't guarantee us. Useful for 6 * resource counting etc.. 7 * 8 * NOTE: don't mess with the types below! The "unsigned long" and 9 * "int" types were carefully placed so as to ensure proper operation 10 * of the macros. 11 * 12 * Copyright (C) 1998, 1999, 2002-2003 Hewlett-Packard Co 13 * David Mosberger-Tang <davidm@hpl.hp.com> 14 */ 15#include <linux/types.h> 16 17#include <asm/intrinsics.h> 18#include <asm/system.h> 19 20 21#define ATOMIC_INIT(i) ((atomic_t) { (i) }) 22#define ATOMIC64_INIT(i) ((atomic64_t) { (i) }) 23 24#define atomic_read(v) (*(volatile int *)&(v)->counter) 25#define atomic64_read(v) (*(volatile long *)&(v)->counter) 26 27#define atomic_set(v,i) (((v)->counter) = (i)) 28#define atomic64_set(v,i) (((v)->counter) = (i)) 29 30static __inline__ int 31ia64_atomic_add (int i, atomic_t *v) 32{ 33 __s32 old, new; 34 CMPXCHG_BUGCHECK_DECL 35 36 do { 37 CMPXCHG_BUGCHECK(v); 38 old = atomic_read(v); 39 new = old + i; 40 } while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic_t)) != old); 41 return new; 42} 43 44static __inline__ int 45ia64_atomic64_add (__s64 i, atomic64_t *v) 46{ 47 __s64 old, new; 48 CMPXCHG_BUGCHECK_DECL 49 50 do { 51 CMPXCHG_BUGCHECK(v); 52 old = atomic64_read(v); 53 new = old + i; 54 } while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic64_t)) != old); 55 return new; 56} 57 58static __inline__ int 59ia64_atomic_sub (int i, atomic_t *v) 60{ 61 __s32 old, new; 62 CMPXCHG_BUGCHECK_DECL 63 64 do { 65 CMPXCHG_BUGCHECK(v); 66 old = atomic_read(v); 67 new = old - i; 68 } while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic_t)) != old); 69 return new; 70} 71 72static __inline__ int 73ia64_atomic64_sub (__s64 i, atomic64_t *v) 74{ 75 __s64 old, new; 76 CMPXCHG_BUGCHECK_DECL 77 78 do { 79 CMPXCHG_BUGCHECK(v); 80 old = atomic64_read(v); 81 new = old - i; 82 } while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic64_t)) != old); 83 return new; 84} 85 86#define atomic_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), old, new)) 87#define atomic_xchg(v, new) (xchg(&((v)->counter), new)) 88 89#define atomic64_cmpxchg(v, old, new) \ 90 (cmpxchg(&((v)->counter), old, new)) 91#define atomic64_xchg(v, new) (xchg(&((v)->counter), new)) 92 93static __inline__ int atomic_add_unless(atomic_t *v, int a, int u) 94{ 95 int c, old; 96 c = atomic_read(v); 97 for (;;) { 98 if (unlikely(c == (u))) 99 break; 100 old = atomic_cmpxchg((v), c, c + (a)); 101 if (likely(old == c)) 102 break; 103 c = old; 104 } 105 return c != (u); 106} 107 108#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0) 109 110static __inline__ int atomic64_add_unless(atomic64_t *v, long a, long u) 111{ 112 long c, old; 113 c = atomic64_read(v); 114 for (;;) { 115 if (unlikely(c == (u))) 116 break; 117 old = atomic64_cmpxchg((v), c, c + (a)); 118 if (likely(old == c)) 119 break; 120 c = old; 121 } 122 return c != (u); 123} 124 125#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0) 126 127#define atomic_add_return(i,v) \ 128({ \ 129 int __ia64_aar_i = (i); \ 130 (__builtin_constant_p(i) \ 131 && ( (__ia64_aar_i == 1) || (__ia64_aar_i == 4) \ 132 || (__ia64_aar_i == 8) || (__ia64_aar_i == 16) \ 133 || (__ia64_aar_i == -1) || (__ia64_aar_i == -4) \ 134 || (__ia64_aar_i == -8) || (__ia64_aar_i == -16))) \ 135 ? ia64_fetch_and_add(__ia64_aar_i, &(v)->counter) \ 136 : ia64_atomic_add(__ia64_aar_i, v); \ 137}) 138 139#define atomic64_add_return(i,v) \ 140({ \ 141 long __ia64_aar_i = (i); \ 142 (__builtin_constant_p(i) \ 143 && ( (__ia64_aar_i == 1) || (__ia64_aar_i == 4) \ 144 || (__ia64_aar_i == 8) || (__ia64_aar_i == 16) \ 145 || (__ia64_aar_i == -1) || (__ia64_aar_i == -4) \ 146 || (__ia64_aar_i == -8) || (__ia64_aar_i == -16))) \ 147 ? ia64_fetch_and_add(__ia64_aar_i, &(v)->counter) \ 148 : ia64_atomic64_add(__ia64_aar_i, v); \ 149}) 150 151/* 152 * Atomically add I to V and return TRUE if the resulting value is 153 * negative. 154 */ 155static __inline__ int 156atomic_add_negative (int i, atomic_t *v) 157{ 158 return atomic_add_return(i, v) < 0; 159} 160 161static __inline__ int 162atomic64_add_negative (__s64 i, atomic64_t *v) 163{ 164 return atomic64_add_return(i, v) < 0; 165} 166 167#define atomic_sub_return(i,v) \ 168({ \ 169 int __ia64_asr_i = (i); \ 170 (__builtin_constant_p(i) \ 171 && ( (__ia64_asr_i == 1) || (__ia64_asr_i == 4) \ 172 || (__ia64_asr_i == 8) || (__ia64_asr_i == 16) \ 173 || (__ia64_asr_i == -1) || (__ia64_asr_i == -4) \ 174 || (__ia64_asr_i == -8) || (__ia64_asr_i == -16))) \ 175 ? ia64_fetch_and_add(-__ia64_asr_i, &(v)->counter) \ 176 : ia64_atomic_sub(__ia64_asr_i, v); \ 177}) 178 179#define atomic64_sub_return(i,v) \ 180({ \ 181 long __ia64_asr_i = (i); \ 182 (__builtin_constant_p(i) \ 183 && ( (__ia64_asr_i == 1) || (__ia64_asr_i == 4) \ 184 || (__ia64_asr_i == 8) || (__ia64_asr_i == 16) \ 185 || (__ia64_asr_i == -1) || (__ia64_asr_i == -4) \ 186 || (__ia64_asr_i == -8) || (__ia64_asr_i == -16))) \ 187 ? ia64_fetch_and_add(-__ia64_asr_i, &(v)->counter) \ 188 : ia64_atomic64_sub(__ia64_asr_i, v); \ 189}) 190 191#define atomic_dec_return(v) atomic_sub_return(1, (v)) 192#define atomic_inc_return(v) atomic_add_return(1, (v)) 193#define atomic64_dec_return(v) atomic64_sub_return(1, (v)) 194#define atomic64_inc_return(v) atomic64_add_return(1, (v)) 195 196#define atomic_sub_and_test(i,v) (atomic_sub_return((i), (v)) == 0) 197#define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0) 198#define atomic_inc_and_test(v) (atomic_add_return(1, (v)) == 0) 199#define atomic64_sub_and_test(i,v) (atomic64_sub_return((i), (v)) == 0) 200#define atomic64_dec_and_test(v) (atomic64_sub_return(1, (v)) == 0) 201#define atomic64_inc_and_test(v) (atomic64_add_return(1, (v)) == 0) 202 203#define atomic_add(i,v) atomic_add_return((i), (v)) 204#define atomic_sub(i,v) atomic_sub_return((i), (v)) 205#define atomic_inc(v) atomic_add(1, (v)) 206#define atomic_dec(v) atomic_sub(1, (v)) 207 208#define atomic64_add(i,v) atomic64_add_return((i), (v)) 209#define atomic64_sub(i,v) atomic64_sub_return((i), (v)) 210#define atomic64_inc(v) atomic64_add(1, (v)) 211#define atomic64_dec(v) atomic64_sub(1, (v)) 212 213/* Atomic operations are already serializing */ 214#define smp_mb__before_atomic_dec() barrier() 215#define smp_mb__after_atomic_dec() barrier() 216#define smp_mb__before_atomic_inc() barrier() 217#define smp_mb__after_atomic_inc() barrier() 218 219#include <asm-generic/atomic-long.h> 220#endif /* _ASM_IA64_ATOMIC_H */