Becky Bruce | feaf7cf | 2005-09-22 14:20:04 -0500 | [diff] [blame] | 1 | #ifndef _ASM_POWERPC_ATOMIC_H_ |
| 2 | #define _ASM_POWERPC_ATOMIC_H_ |
| 3 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | /* |
| 5 | * PowerPC atomic operations |
| 6 | */ |
| 7 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | typedef struct { volatile int counter; } atomic_t; |
| 9 | |
| 10 | #ifdef __KERNEL__ |
Becky Bruce | feaf7cf | 2005-09-22 14:20:04 -0500 | [diff] [blame] | 11 | #include <asm/synch.h> |
David Gibson | 3ddfbcf | 2005-11-10 12:56:55 +1100 | [diff] [blame] | 12 | #include <asm/asm-compat.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | |
Becky Bruce | feaf7cf | 2005-09-22 14:20:04 -0500 | [diff] [blame] | 14 | #define ATOMIC_INIT(i) { (i) } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | |
| 16 | #define atomic_read(v) ((v)->counter) |
| 17 | #define atomic_set(v,i) (((v)->counter) = (i)) |
| 18 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | static __inline__ void atomic_add(int a, atomic_t *v) |
| 20 | { |
| 21 | int t; |
| 22 | |
| 23 | __asm__ __volatile__( |
| 24 | "1: lwarx %0,0,%3 # atomic_add\n\ |
| 25 | add %0,%2,%0\n" |
| 26 | PPC405_ERR77(0,%3) |
| 27 | " stwcx. %0,0,%3 \n\ |
| 28 | bne- 1b" |
| 29 | : "=&r" (t), "=m" (v->counter) |
| 30 | : "r" (a), "r" (&v->counter), "m" (v->counter) |
| 31 | : "cc"); |
| 32 | } |
| 33 | |
| 34 | static __inline__ int atomic_add_return(int a, atomic_t *v) |
| 35 | { |
| 36 | int t; |
| 37 | |
| 38 | __asm__ __volatile__( |
Becky Bruce | feaf7cf | 2005-09-22 14:20:04 -0500 | [diff] [blame] | 39 | EIEIO_ON_SMP |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | "1: lwarx %0,0,%2 # atomic_add_return\n\ |
| 41 | add %0,%1,%0\n" |
| 42 | PPC405_ERR77(0,%2) |
| 43 | " stwcx. %0,0,%2 \n\ |
| 44 | bne- 1b" |
Becky Bruce | feaf7cf | 2005-09-22 14:20:04 -0500 | [diff] [blame] | 45 | ISYNC_ON_SMP |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | : "=&r" (t) |
| 47 | : "r" (a), "r" (&v->counter) |
| 48 | : "cc", "memory"); |
| 49 | |
| 50 | return t; |
| 51 | } |
| 52 | |
| 53 | #define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0) |
| 54 | |
| 55 | static __inline__ void atomic_sub(int a, atomic_t *v) |
| 56 | { |
| 57 | int t; |
| 58 | |
| 59 | __asm__ __volatile__( |
| 60 | "1: lwarx %0,0,%3 # atomic_sub\n\ |
| 61 | subf %0,%2,%0\n" |
| 62 | PPC405_ERR77(0,%3) |
| 63 | " stwcx. %0,0,%3 \n\ |
| 64 | bne- 1b" |
| 65 | : "=&r" (t), "=m" (v->counter) |
| 66 | : "r" (a), "r" (&v->counter), "m" (v->counter) |
| 67 | : "cc"); |
| 68 | } |
| 69 | |
| 70 | static __inline__ int atomic_sub_return(int a, atomic_t *v) |
| 71 | { |
| 72 | int t; |
| 73 | |
| 74 | __asm__ __volatile__( |
Becky Bruce | feaf7cf | 2005-09-22 14:20:04 -0500 | [diff] [blame] | 75 | EIEIO_ON_SMP |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | "1: lwarx %0,0,%2 # atomic_sub_return\n\ |
| 77 | subf %0,%1,%0\n" |
| 78 | PPC405_ERR77(0,%2) |
| 79 | " stwcx. %0,0,%2 \n\ |
| 80 | bne- 1b" |
Becky Bruce | feaf7cf | 2005-09-22 14:20:04 -0500 | [diff] [blame] | 81 | ISYNC_ON_SMP |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | : "=&r" (t) |
| 83 | : "r" (a), "r" (&v->counter) |
| 84 | : "cc", "memory"); |
| 85 | |
| 86 | return t; |
| 87 | } |
| 88 | |
| 89 | static __inline__ void atomic_inc(atomic_t *v) |
| 90 | { |
| 91 | int t; |
| 92 | |
| 93 | __asm__ __volatile__( |
| 94 | "1: lwarx %0,0,%2 # atomic_inc\n\ |
| 95 | addic %0,%0,1\n" |
| 96 | PPC405_ERR77(0,%2) |
| 97 | " stwcx. %0,0,%2 \n\ |
| 98 | bne- 1b" |
| 99 | : "=&r" (t), "=m" (v->counter) |
| 100 | : "r" (&v->counter), "m" (v->counter) |
| 101 | : "cc"); |
| 102 | } |
| 103 | |
| 104 | static __inline__ int atomic_inc_return(atomic_t *v) |
| 105 | { |
| 106 | int t; |
| 107 | |
| 108 | __asm__ __volatile__( |
Becky Bruce | feaf7cf | 2005-09-22 14:20:04 -0500 | [diff] [blame] | 109 | EIEIO_ON_SMP |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | "1: lwarx %0,0,%1 # atomic_inc_return\n\ |
| 111 | addic %0,%0,1\n" |
| 112 | PPC405_ERR77(0,%1) |
| 113 | " stwcx. %0,0,%1 \n\ |
| 114 | bne- 1b" |
Becky Bruce | feaf7cf | 2005-09-22 14:20:04 -0500 | [diff] [blame] | 115 | ISYNC_ON_SMP |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | : "=&r" (t) |
| 117 | : "r" (&v->counter) |
| 118 | : "cc", "memory"); |
| 119 | |
| 120 | return t; |
| 121 | } |
| 122 | |
| 123 | /* |
| 124 | * atomic_inc_and_test - increment and test |
| 125 | * @v: pointer of type atomic_t |
| 126 | * |
| 127 | * Atomically increments @v by 1 |
| 128 | * and returns true if the result is zero, or false for all |
| 129 | * other cases. |
| 130 | */ |
| 131 | #define atomic_inc_and_test(v) (atomic_inc_return(v) == 0) |
| 132 | |
| 133 | static __inline__ void atomic_dec(atomic_t *v) |
| 134 | { |
| 135 | int t; |
| 136 | |
| 137 | __asm__ __volatile__( |
| 138 | "1: lwarx %0,0,%2 # atomic_dec\n\ |
| 139 | addic %0,%0,-1\n" |
| 140 | PPC405_ERR77(0,%2)\ |
| 141 | " stwcx. %0,0,%2\n\ |
| 142 | bne- 1b" |
| 143 | : "=&r" (t), "=m" (v->counter) |
| 144 | : "r" (&v->counter), "m" (v->counter) |
| 145 | : "cc"); |
| 146 | } |
| 147 | |
| 148 | static __inline__ int atomic_dec_return(atomic_t *v) |
| 149 | { |
| 150 | int t; |
| 151 | |
| 152 | __asm__ __volatile__( |
Becky Bruce | feaf7cf | 2005-09-22 14:20:04 -0500 | [diff] [blame] | 153 | EIEIO_ON_SMP |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | "1: lwarx %0,0,%1 # atomic_dec_return\n\ |
| 155 | addic %0,%0,-1\n" |
| 156 | PPC405_ERR77(0,%1) |
| 157 | " stwcx. %0,0,%1\n\ |
| 158 | bne- 1b" |
Becky Bruce | feaf7cf | 2005-09-22 14:20:04 -0500 | [diff] [blame] | 159 | ISYNC_ON_SMP |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | : "=&r" (t) |
| 161 | : "r" (&v->counter) |
| 162 | : "cc", "memory"); |
| 163 | |
| 164 | return t; |
| 165 | } |
| 166 | |
Nick Piggin | 4a6dae6 | 2005-11-13 16:07:24 -0800 | [diff] [blame] | 167 | #define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n))) |
Ingo Molnar | ffbf670 | 2006-01-09 15:59:17 -0800 | [diff] [blame^] | 168 | #define atomic_xchg(v, new) (xchg(&((v)->counter), new)) |
Nick Piggin | 4a6dae6 | 2005-11-13 16:07:24 -0800 | [diff] [blame] | 169 | |
Nick Piggin | 8426e1f | 2005-11-13 16:07:25 -0800 | [diff] [blame] | 170 | /** |
| 171 | * atomic_add_unless - add unless the number is a given value |
| 172 | * @v: pointer of type atomic_t |
| 173 | * @a: the amount to add to v... |
| 174 | * @u: ...unless v is equal to u. |
| 175 | * |
| 176 | * Atomically adds @a to @v, so long as it was not @u. |
| 177 | * Returns non-zero if @v was not @u, and zero otherwise. |
| 178 | */ |
| 179 | #define atomic_add_unless(v, a, u) \ |
| 180 | ({ \ |
| 181 | int c, old; \ |
| 182 | c = atomic_read(v); \ |
| 183 | for (;;) { \ |
| 184 | if (unlikely(c == (u))) \ |
| 185 | break; \ |
| 186 | old = atomic_cmpxchg((v), c, c + (a)); \ |
| 187 | if (likely(old == c)) \ |
| 188 | break; \ |
| 189 | c = old; \ |
| 190 | } \ |
| 191 | c != (u); \ |
| 192 | }) |
| 193 | #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0) |
| 194 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | #define atomic_sub_and_test(a, v) (atomic_sub_return((a), (v)) == 0) |
| 196 | #define atomic_dec_and_test(v) (atomic_dec_return((v)) == 0) |
| 197 | |
| 198 | /* |
| 199 | * Atomically test *v and decrement if it is greater than 0. |
| 200 | * The function returns the old value of *v minus 1. |
| 201 | */ |
| 202 | static __inline__ int atomic_dec_if_positive(atomic_t *v) |
| 203 | { |
| 204 | int t; |
| 205 | |
| 206 | __asm__ __volatile__( |
Becky Bruce | feaf7cf | 2005-09-22 14:20:04 -0500 | [diff] [blame] | 207 | EIEIO_ON_SMP |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | "1: lwarx %0,0,%1 # atomic_dec_if_positive\n\ |
| 209 | addic. %0,%0,-1\n\ |
| 210 | blt- 2f\n" |
| 211 | PPC405_ERR77(0,%1) |
| 212 | " stwcx. %0,0,%1\n\ |
| 213 | bne- 1b" |
Becky Bruce | feaf7cf | 2005-09-22 14:20:04 -0500 | [diff] [blame] | 214 | ISYNC_ON_SMP |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | "\n\ |
| 216 | 2:" : "=&r" (t) |
| 217 | : "r" (&v->counter) |
| 218 | : "cc", "memory"); |
| 219 | |
| 220 | return t; |
| 221 | } |
| 222 | |
Becky Bruce | feaf7cf | 2005-09-22 14:20:04 -0500 | [diff] [blame] | 223 | #define smp_mb__before_atomic_dec() smp_mb() |
| 224 | #define smp_mb__after_atomic_dec() smp_mb() |
| 225 | #define smp_mb__before_atomic_inc() smp_mb() |
| 226 | #define smp_mb__after_atomic_inc() smp_mb() |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | |
Stephen Rothwell | 06a98db | 2005-11-10 15:51:14 +1100 | [diff] [blame] | 228 | #ifdef __powerpc64__ |
| 229 | |
| 230 | typedef struct { volatile long counter; } atomic64_t; |
| 231 | |
| 232 | #define ATOMIC64_INIT(i) { (i) } |
| 233 | |
| 234 | #define atomic64_read(v) ((v)->counter) |
| 235 | #define atomic64_set(v,i) (((v)->counter) = (i)) |
| 236 | |
| 237 | static __inline__ void atomic64_add(long a, atomic64_t *v) |
| 238 | { |
| 239 | long t; |
| 240 | |
| 241 | __asm__ __volatile__( |
| 242 | "1: ldarx %0,0,%3 # atomic64_add\n\ |
| 243 | add %0,%2,%0\n\ |
| 244 | stdcx. %0,0,%3 \n\ |
| 245 | bne- 1b" |
| 246 | : "=&r" (t), "=m" (v->counter) |
| 247 | : "r" (a), "r" (&v->counter), "m" (v->counter) |
| 248 | : "cc"); |
| 249 | } |
| 250 | |
| 251 | static __inline__ long atomic64_add_return(long a, atomic64_t *v) |
| 252 | { |
| 253 | long t; |
| 254 | |
| 255 | __asm__ __volatile__( |
| 256 | EIEIO_ON_SMP |
| 257 | "1: ldarx %0,0,%2 # atomic64_add_return\n\ |
| 258 | add %0,%1,%0\n\ |
| 259 | stdcx. %0,0,%2 \n\ |
| 260 | bne- 1b" |
| 261 | ISYNC_ON_SMP |
| 262 | : "=&r" (t) |
| 263 | : "r" (a), "r" (&v->counter) |
| 264 | : "cc", "memory"); |
| 265 | |
| 266 | return t; |
| 267 | } |
| 268 | |
| 269 | #define atomic64_add_negative(a, v) (atomic64_add_return((a), (v)) < 0) |
| 270 | |
| 271 | static __inline__ void atomic64_sub(long a, atomic64_t *v) |
| 272 | { |
| 273 | long t; |
| 274 | |
| 275 | __asm__ __volatile__( |
| 276 | "1: ldarx %0,0,%3 # atomic64_sub\n\ |
| 277 | subf %0,%2,%0\n\ |
| 278 | stdcx. %0,0,%3 \n\ |
| 279 | bne- 1b" |
| 280 | : "=&r" (t), "=m" (v->counter) |
| 281 | : "r" (a), "r" (&v->counter), "m" (v->counter) |
| 282 | : "cc"); |
| 283 | } |
| 284 | |
| 285 | static __inline__ long atomic64_sub_return(long a, atomic64_t *v) |
| 286 | { |
| 287 | long t; |
| 288 | |
| 289 | __asm__ __volatile__( |
| 290 | EIEIO_ON_SMP |
| 291 | "1: ldarx %0,0,%2 # atomic64_sub_return\n\ |
| 292 | subf %0,%1,%0\n\ |
| 293 | stdcx. %0,0,%2 \n\ |
| 294 | bne- 1b" |
| 295 | ISYNC_ON_SMP |
| 296 | : "=&r" (t) |
| 297 | : "r" (a), "r" (&v->counter) |
| 298 | : "cc", "memory"); |
| 299 | |
| 300 | return t; |
| 301 | } |
| 302 | |
| 303 | static __inline__ void atomic64_inc(atomic64_t *v) |
| 304 | { |
| 305 | long t; |
| 306 | |
| 307 | __asm__ __volatile__( |
| 308 | "1: ldarx %0,0,%2 # atomic64_inc\n\ |
| 309 | addic %0,%0,1\n\ |
| 310 | stdcx. %0,0,%2 \n\ |
| 311 | bne- 1b" |
| 312 | : "=&r" (t), "=m" (v->counter) |
| 313 | : "r" (&v->counter), "m" (v->counter) |
| 314 | : "cc"); |
| 315 | } |
| 316 | |
| 317 | static __inline__ long atomic64_inc_return(atomic64_t *v) |
| 318 | { |
| 319 | long t; |
| 320 | |
| 321 | __asm__ __volatile__( |
| 322 | EIEIO_ON_SMP |
| 323 | "1: ldarx %0,0,%1 # atomic64_inc_return\n\ |
| 324 | addic %0,%0,1\n\ |
| 325 | stdcx. %0,0,%1 \n\ |
| 326 | bne- 1b" |
| 327 | ISYNC_ON_SMP |
| 328 | : "=&r" (t) |
| 329 | : "r" (&v->counter) |
| 330 | : "cc", "memory"); |
| 331 | |
| 332 | return t; |
| 333 | } |
| 334 | |
| 335 | /* |
| 336 | * atomic64_inc_and_test - increment and test |
| 337 | * @v: pointer of type atomic64_t |
| 338 | * |
| 339 | * Atomically increments @v by 1 |
| 340 | * and returns true if the result is zero, or false for all |
| 341 | * other cases. |
| 342 | */ |
| 343 | #define atomic64_inc_and_test(v) (atomic64_inc_return(v) == 0) |
| 344 | |
| 345 | static __inline__ void atomic64_dec(atomic64_t *v) |
| 346 | { |
| 347 | long t; |
| 348 | |
| 349 | __asm__ __volatile__( |
| 350 | "1: ldarx %0,0,%2 # atomic64_dec\n\ |
| 351 | addic %0,%0,-1\n\ |
| 352 | stdcx. %0,0,%2\n\ |
| 353 | bne- 1b" |
| 354 | : "=&r" (t), "=m" (v->counter) |
| 355 | : "r" (&v->counter), "m" (v->counter) |
| 356 | : "cc"); |
| 357 | } |
| 358 | |
| 359 | static __inline__ long atomic64_dec_return(atomic64_t *v) |
| 360 | { |
| 361 | long t; |
| 362 | |
| 363 | __asm__ __volatile__( |
| 364 | EIEIO_ON_SMP |
| 365 | "1: ldarx %0,0,%1 # atomic64_dec_return\n\ |
| 366 | addic %0,%0,-1\n\ |
| 367 | stdcx. %0,0,%1\n\ |
| 368 | bne- 1b" |
| 369 | ISYNC_ON_SMP |
| 370 | : "=&r" (t) |
| 371 | : "r" (&v->counter) |
| 372 | : "cc", "memory"); |
| 373 | |
| 374 | return t; |
| 375 | } |
| 376 | |
| 377 | #define atomic64_sub_and_test(a, v) (atomic64_sub_return((a), (v)) == 0) |
| 378 | #define atomic64_dec_and_test(v) (atomic64_dec_return((v)) == 0) |
| 379 | |
| 380 | /* |
| 381 | * Atomically test *v and decrement if it is greater than 0. |
| 382 | * The function returns the old value of *v minus 1. |
| 383 | */ |
| 384 | static __inline__ long atomic64_dec_if_positive(atomic64_t *v) |
| 385 | { |
| 386 | long t; |
| 387 | |
| 388 | __asm__ __volatile__( |
| 389 | EIEIO_ON_SMP |
| 390 | "1: ldarx %0,0,%1 # atomic64_dec_if_positive\n\ |
| 391 | addic. %0,%0,-1\n\ |
| 392 | blt- 2f\n\ |
| 393 | stdcx. %0,0,%1\n\ |
| 394 | bne- 1b" |
| 395 | ISYNC_ON_SMP |
| 396 | "\n\ |
| 397 | 2:" : "=&r" (t) |
| 398 | : "r" (&v->counter) |
| 399 | : "cc", "memory"); |
| 400 | |
| 401 | return t; |
| 402 | } |
| 403 | |
| 404 | #endif /* __powerpc64__ */ |
| 405 | |
Christoph Lameter | d3cb487 | 2006-01-06 00:11:20 -0800 | [diff] [blame] | 406 | #include <asm-generic/atomic.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | #endif /* __KERNEL__ */ |
Becky Bruce | feaf7cf | 2005-09-22 14:20:04 -0500 | [diff] [blame] | 408 | #endif /* _ASM_POWERPC_ATOMIC_H_ */ |