Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Mathieu Desnoyers | 2856f5e | 2007-05-08 00:34:38 -0700 | [diff] [blame] | 18 | #include <asm/system.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | |
| 20 | /* |
| 21 | * On IA-64, counter must always be volatile to ensure that that the |
| 22 | * memory accesses are ordered. |
| 23 | */ |
| 24 | typedef struct { volatile __s32 counter; } atomic_t; |
| 25 | typedef struct { volatile __s64 counter; } atomic64_t; |
| 26 | |
| 27 | #define ATOMIC_INIT(i) ((atomic_t) { (i) }) |
| 28 | #define ATOMIC64_INIT(i) ((atomic64_t) { (i) }) |
| 29 | |
| 30 | #define atomic_read(v) ((v)->counter) |
| 31 | #define atomic64_read(v) ((v)->counter) |
| 32 | |
| 33 | #define atomic_set(v,i) (((v)->counter) = (i)) |
| 34 | #define atomic64_set(v,i) (((v)->counter) = (i)) |
| 35 | |
| 36 | static __inline__ int |
| 37 | ia64_atomic_add (int i, atomic_t *v) |
| 38 | { |
| 39 | __s32 old, new; |
| 40 | CMPXCHG_BUGCHECK_DECL |
| 41 | |
| 42 | do { |
| 43 | CMPXCHG_BUGCHECK(v); |
| 44 | old = atomic_read(v); |
| 45 | new = old + i; |
| 46 | } while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic_t)) != old); |
| 47 | return new; |
| 48 | } |
| 49 | |
| 50 | static __inline__ int |
| 51 | ia64_atomic64_add (__s64 i, atomic64_t *v) |
| 52 | { |
| 53 | __s64 old, new; |
| 54 | CMPXCHG_BUGCHECK_DECL |
| 55 | |
| 56 | do { |
| 57 | CMPXCHG_BUGCHECK(v); |
Andreas Schwab | 6cba986 | 2007-08-10 23:42:59 +0200 | [diff] [blame^] | 58 | old = atomic64_read(v); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | new = old + i; |
| 60 | } while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic64_t)) != old); |
| 61 | return new; |
| 62 | } |
| 63 | |
| 64 | static __inline__ int |
| 65 | ia64_atomic_sub (int i, atomic_t *v) |
| 66 | { |
| 67 | __s32 old, new; |
| 68 | CMPXCHG_BUGCHECK_DECL |
| 69 | |
| 70 | do { |
| 71 | CMPXCHG_BUGCHECK(v); |
| 72 | old = atomic_read(v); |
| 73 | new = old - i; |
| 74 | } while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic_t)) != old); |
| 75 | return new; |
| 76 | } |
| 77 | |
| 78 | static __inline__ int |
| 79 | ia64_atomic64_sub (__s64 i, atomic64_t *v) |
| 80 | { |
| 81 | __s64 old, new; |
| 82 | CMPXCHG_BUGCHECK_DECL |
| 83 | |
| 84 | do { |
| 85 | CMPXCHG_BUGCHECK(v); |
Andreas Schwab | 6cba986 | 2007-08-10 23:42:59 +0200 | [diff] [blame^] | 86 | old = atomic64_read(v); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | new = old - i; |
| 88 | } while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic64_t)) != old); |
| 89 | return new; |
| 90 | } |
| 91 | |
Mathieu Desnoyers | 8197913 | 2007-05-08 00:34:22 -0700 | [diff] [blame] | 92 | #define atomic_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), old, new)) |
Ingo Molnar | ffbf670 | 2006-01-09 15:59:17 -0800 | [diff] [blame] | 93 | #define atomic_xchg(v, new) (xchg(&((v)->counter), new)) |
Nick Piggin | 4a6dae6 | 2005-11-13 16:07:24 -0800 | [diff] [blame] | 94 | |
Mathieu Desnoyers | 8197913 | 2007-05-08 00:34:22 -0700 | [diff] [blame] | 95 | #define atomic64_cmpxchg(v, old, new) \ |
| 96 | (cmpxchg(&((v)->counter), old, new)) |
| 97 | #define atomic64_xchg(v, new) (xchg(&((v)->counter), new)) |
| 98 | |
Mathieu Desnoyers | 2856f5e | 2007-05-08 00:34:38 -0700 | [diff] [blame] | 99 | static __inline__ int atomic_add_unless(atomic_t *v, int a, int u) |
| 100 | { |
| 101 | int c, old; |
| 102 | c = atomic_read(v); |
| 103 | for (;;) { |
| 104 | if (unlikely(c == (u))) |
| 105 | break; |
| 106 | old = atomic_cmpxchg((v), c, c + (a)); |
| 107 | if (likely(old == c)) |
| 108 | break; |
| 109 | c = old; |
| 110 | } |
| 111 | return c != (u); |
| 112 | } |
| 113 | |
Nick Piggin | 8426e1f | 2005-11-13 16:07:25 -0800 | [diff] [blame] | 114 | #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0) |
| 115 | |
Mathieu Desnoyers | 2856f5e | 2007-05-08 00:34:38 -0700 | [diff] [blame] | 116 | static __inline__ int atomic64_add_unless(atomic64_t *v, long a, long u) |
| 117 | { |
| 118 | long c, old; |
| 119 | c = atomic64_read(v); |
| 120 | for (;;) { |
| 121 | if (unlikely(c == (u))) |
| 122 | break; |
| 123 | old = atomic64_cmpxchg((v), c, c + (a)); |
| 124 | if (likely(old == c)) |
| 125 | break; |
| 126 | c = old; |
| 127 | } |
| 128 | return c != (u); |
| 129 | } |
| 130 | |
Mathieu Desnoyers | 8197913 | 2007-05-08 00:34:22 -0700 | [diff] [blame] | 131 | #define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0) |
| 132 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | #define atomic_add_return(i,v) \ |
| 134 | ({ \ |
| 135 | int __ia64_aar_i = (i); \ |
| 136 | (__builtin_constant_p(i) \ |
| 137 | && ( (__ia64_aar_i == 1) || (__ia64_aar_i == 4) \ |
| 138 | || (__ia64_aar_i == 8) || (__ia64_aar_i == 16) \ |
| 139 | || (__ia64_aar_i == -1) || (__ia64_aar_i == -4) \ |
| 140 | || (__ia64_aar_i == -8) || (__ia64_aar_i == -16))) \ |
| 141 | ? ia64_fetch_and_add(__ia64_aar_i, &(v)->counter) \ |
| 142 | : ia64_atomic_add(__ia64_aar_i, v); \ |
| 143 | }) |
| 144 | |
| 145 | #define atomic64_add_return(i,v) \ |
| 146 | ({ \ |
| 147 | long __ia64_aar_i = (i); \ |
| 148 | (__builtin_constant_p(i) \ |
| 149 | && ( (__ia64_aar_i == 1) || (__ia64_aar_i == 4) \ |
| 150 | || (__ia64_aar_i == 8) || (__ia64_aar_i == 16) \ |
| 151 | || (__ia64_aar_i == -1) || (__ia64_aar_i == -4) \ |
| 152 | || (__ia64_aar_i == -8) || (__ia64_aar_i == -16))) \ |
| 153 | ? ia64_fetch_and_add(__ia64_aar_i, &(v)->counter) \ |
| 154 | : ia64_atomic64_add(__ia64_aar_i, v); \ |
| 155 | }) |
| 156 | |
| 157 | /* |
| 158 | * Atomically add I to V and return TRUE if the resulting value is |
| 159 | * negative. |
| 160 | */ |
| 161 | static __inline__ int |
| 162 | atomic_add_negative (int i, atomic_t *v) |
| 163 | { |
| 164 | return atomic_add_return(i, v) < 0; |
| 165 | } |
| 166 | |
| 167 | static __inline__ int |
| 168 | atomic64_add_negative (__s64 i, atomic64_t *v) |
| 169 | { |
| 170 | return atomic64_add_return(i, v) < 0; |
| 171 | } |
| 172 | |
| 173 | #define atomic_sub_return(i,v) \ |
| 174 | ({ \ |
| 175 | int __ia64_asr_i = (i); \ |
| 176 | (__builtin_constant_p(i) \ |
| 177 | && ( (__ia64_asr_i == 1) || (__ia64_asr_i == 4) \ |
| 178 | || (__ia64_asr_i == 8) || (__ia64_asr_i == 16) \ |
| 179 | || (__ia64_asr_i == -1) || (__ia64_asr_i == -4) \ |
| 180 | || (__ia64_asr_i == -8) || (__ia64_asr_i == -16))) \ |
| 181 | ? ia64_fetch_and_add(-__ia64_asr_i, &(v)->counter) \ |
| 182 | : ia64_atomic_sub(__ia64_asr_i, v); \ |
| 183 | }) |
| 184 | |
| 185 | #define atomic64_sub_return(i,v) \ |
| 186 | ({ \ |
| 187 | long __ia64_asr_i = (i); \ |
| 188 | (__builtin_constant_p(i) \ |
| 189 | && ( (__ia64_asr_i == 1) || (__ia64_asr_i == 4) \ |
| 190 | || (__ia64_asr_i == 8) || (__ia64_asr_i == 16) \ |
| 191 | || (__ia64_asr_i == -1) || (__ia64_asr_i == -4) \ |
| 192 | || (__ia64_asr_i == -8) || (__ia64_asr_i == -16))) \ |
| 193 | ? ia64_fetch_and_add(-__ia64_asr_i, &(v)->counter) \ |
| 194 | : ia64_atomic64_sub(__ia64_asr_i, v); \ |
| 195 | }) |
| 196 | |
| 197 | #define atomic_dec_return(v) atomic_sub_return(1, (v)) |
| 198 | #define atomic_inc_return(v) atomic_add_return(1, (v)) |
| 199 | #define atomic64_dec_return(v) atomic64_sub_return(1, (v)) |
| 200 | #define atomic64_inc_return(v) atomic64_add_return(1, (v)) |
| 201 | |
| 202 | #define atomic_sub_and_test(i,v) (atomic_sub_return((i), (v)) == 0) |
| 203 | #define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0) |
| 204 | #define atomic_inc_and_test(v) (atomic_add_return(1, (v)) == 0) |
| 205 | #define atomic64_sub_and_test(i,v) (atomic64_sub_return((i), (v)) == 0) |
| 206 | #define atomic64_dec_and_test(v) (atomic64_sub_return(1, (v)) == 0) |
| 207 | #define atomic64_inc_and_test(v) (atomic64_add_return(1, (v)) == 0) |
| 208 | |
| 209 | #define atomic_add(i,v) atomic_add_return((i), (v)) |
| 210 | #define atomic_sub(i,v) atomic_sub_return((i), (v)) |
| 211 | #define atomic_inc(v) atomic_add(1, (v)) |
| 212 | #define atomic_dec(v) atomic_sub(1, (v)) |
| 213 | |
| 214 | #define atomic64_add(i,v) atomic64_add_return((i), (v)) |
| 215 | #define atomic64_sub(i,v) atomic64_sub_return((i), (v)) |
| 216 | #define atomic64_inc(v) atomic64_add(1, (v)) |
| 217 | #define atomic64_dec(v) atomic64_sub(1, (v)) |
| 218 | |
| 219 | /* Atomic operations are already serializing */ |
| 220 | #define smp_mb__before_atomic_dec() barrier() |
| 221 | #define smp_mb__after_atomic_dec() barrier() |
| 222 | #define smp_mb__before_atomic_inc() barrier() |
| 223 | #define smp_mb__after_atomic_inc() barrier() |
| 224 | |
Christoph Lameter | d3cb487 | 2006-01-06 00:11:20 -0800 | [diff] [blame] | 225 | #include <asm-generic/atomic.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | #endif /* _ASM_IA64_ATOMIC_H */ |