Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Atomic operations that C can't guarantee us. Useful for |
| 3 | * resource counting etc.. |
| 4 | * |
| 5 | * But use these as seldom as possible since they are much more slower |
| 6 | * than regular operations. |
| 7 | * |
| 8 | * This file is subject to the terms and conditions of the GNU General Public |
| 9 | * License. See the file "COPYING" in the main directory of this archive |
| 10 | * for more details. |
| 11 | * |
| 12 | * Copyright (C) 1996, 97, 99, 2000, 03, 04 by Ralf Baechle |
| 13 | */ |
| 14 | |
| 15 | /* |
| 16 | * As workaround for the ATOMIC_DEC_AND_LOCK / atomic_dec_and_lock mess in |
| 17 | * <linux/spinlock.h> we have to include <linux/spinlock.h> outside the |
| 18 | * main big wrapper ... |
| 19 | */ |
| 20 | #include <linux/config.h> |
| 21 | #include <linux/spinlock.h> |
| 22 | |
| 23 | #ifndef _ASM_ATOMIC_H |
| 24 | #define _ASM_ATOMIC_H |
| 25 | |
| 26 | #include <asm/cpu-features.h> |
| 27 | #include <asm/war.h> |
| 28 | |
| 29 | extern spinlock_t atomic_lock; |
| 30 | |
| 31 | typedef struct { volatile int counter; } atomic_t; |
| 32 | |
| 33 | #define ATOMIC_INIT(i) { (i) } |
| 34 | |
| 35 | /* |
| 36 | * atomic_read - read atomic variable |
| 37 | * @v: pointer of type atomic_t |
| 38 | * |
| 39 | * Atomically reads the value of @v. |
| 40 | */ |
| 41 | #define atomic_read(v) ((v)->counter) |
| 42 | |
| 43 | /* |
| 44 | * atomic_set - set atomic variable |
| 45 | * @v: pointer of type atomic_t |
| 46 | * @i: required value |
| 47 | * |
| 48 | * Atomically sets the value of @v to @i. |
| 49 | */ |
| 50 | #define atomic_set(v,i) ((v)->counter = (i)) |
| 51 | |
| 52 | /* |
| 53 | * atomic_add - add integer to atomic variable |
| 54 | * @i: integer value to add |
| 55 | * @v: pointer of type atomic_t |
| 56 | * |
| 57 | * Atomically adds @i to @v. |
| 58 | */ |
| 59 | static __inline__ void atomic_add(int i, atomic_t * v) |
| 60 | { |
| 61 | if (cpu_has_llsc && R10000_LLSC_WAR) { |
| 62 | unsigned long temp; |
| 63 | |
| 64 | __asm__ __volatile__( |
Maciej W. Rozycki | aac8aa7 | 2005-06-14 17:35:03 +0000 | [diff] [blame^] | 65 | " .set mips2 \n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | "1: ll %0, %1 # atomic_add \n" |
| 67 | " addu %0, %2 \n" |
| 68 | " sc %0, %1 \n" |
| 69 | " beqzl %0, 1b \n" |
Maciej W. Rozycki | aac8aa7 | 2005-06-14 17:35:03 +0000 | [diff] [blame^] | 70 | " .set mips0 \n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | : "=&r" (temp), "=m" (v->counter) |
| 72 | : "Ir" (i), "m" (v->counter)); |
| 73 | } else if (cpu_has_llsc) { |
| 74 | unsigned long temp; |
| 75 | |
| 76 | __asm__ __volatile__( |
Maciej W. Rozycki | aac8aa7 | 2005-06-14 17:35:03 +0000 | [diff] [blame^] | 77 | " .set mips2 \n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | "1: ll %0, %1 # atomic_add \n" |
| 79 | " addu %0, %2 \n" |
| 80 | " sc %0, %1 \n" |
| 81 | " beqz %0, 1b \n" |
Maciej W. Rozycki | aac8aa7 | 2005-06-14 17:35:03 +0000 | [diff] [blame^] | 82 | " .set mips0 \n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | : "=&r" (temp), "=m" (v->counter) |
| 84 | : "Ir" (i), "m" (v->counter)); |
| 85 | } else { |
| 86 | unsigned long flags; |
| 87 | |
| 88 | spin_lock_irqsave(&atomic_lock, flags); |
| 89 | v->counter += i; |
| 90 | spin_unlock_irqrestore(&atomic_lock, flags); |
| 91 | } |
| 92 | } |
| 93 | |
| 94 | /* |
| 95 | * atomic_sub - subtract the atomic variable |
| 96 | * @i: integer value to subtract |
| 97 | * @v: pointer of type atomic_t |
| 98 | * |
| 99 | * Atomically subtracts @i from @v. |
| 100 | */ |
| 101 | static __inline__ void atomic_sub(int i, atomic_t * v) |
| 102 | { |
| 103 | if (cpu_has_llsc && R10000_LLSC_WAR) { |
| 104 | unsigned long temp; |
| 105 | |
| 106 | __asm__ __volatile__( |
Maciej W. Rozycki | aac8aa7 | 2005-06-14 17:35:03 +0000 | [diff] [blame^] | 107 | " .set mips2 \n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | "1: ll %0, %1 # atomic_sub \n" |
| 109 | " subu %0, %2 \n" |
| 110 | " sc %0, %1 \n" |
| 111 | " beqzl %0, 1b \n" |
Maciej W. Rozycki | aac8aa7 | 2005-06-14 17:35:03 +0000 | [diff] [blame^] | 112 | " .set mips0 \n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | : "=&r" (temp), "=m" (v->counter) |
| 114 | : "Ir" (i), "m" (v->counter)); |
| 115 | } else if (cpu_has_llsc) { |
| 116 | unsigned long temp; |
| 117 | |
| 118 | __asm__ __volatile__( |
Maciej W. Rozycki | aac8aa7 | 2005-06-14 17:35:03 +0000 | [diff] [blame^] | 119 | " .set mips2 \n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | "1: ll %0, %1 # atomic_sub \n" |
| 121 | " subu %0, %2 \n" |
| 122 | " sc %0, %1 \n" |
| 123 | " beqz %0, 1b \n" |
Maciej W. Rozycki | aac8aa7 | 2005-06-14 17:35:03 +0000 | [diff] [blame^] | 124 | " .set mips0 \n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | : "=&r" (temp), "=m" (v->counter) |
| 126 | : "Ir" (i), "m" (v->counter)); |
| 127 | } else { |
| 128 | unsigned long flags; |
| 129 | |
| 130 | spin_lock_irqsave(&atomic_lock, flags); |
| 131 | v->counter -= i; |
| 132 | spin_unlock_irqrestore(&atomic_lock, flags); |
| 133 | } |
| 134 | } |
| 135 | |
| 136 | /* |
| 137 | * Same as above, but return the result value |
| 138 | */ |
| 139 | static __inline__ int atomic_add_return(int i, atomic_t * v) |
| 140 | { |
| 141 | unsigned long result; |
| 142 | |
| 143 | if (cpu_has_llsc && R10000_LLSC_WAR) { |
| 144 | unsigned long temp; |
| 145 | |
| 146 | __asm__ __volatile__( |
Maciej W. Rozycki | aac8aa7 | 2005-06-14 17:35:03 +0000 | [diff] [blame^] | 147 | " .set mips2 \n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | "1: ll %1, %2 # atomic_add_return \n" |
| 149 | " addu %0, %1, %3 \n" |
| 150 | " sc %0, %2 \n" |
| 151 | " beqzl %0, 1b \n" |
| 152 | " addu %0, %1, %3 \n" |
| 153 | " sync \n" |
Maciej W. Rozycki | aac8aa7 | 2005-06-14 17:35:03 +0000 | [diff] [blame^] | 154 | " .set mips0 \n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | : "=&r" (result), "=&r" (temp), "=m" (v->counter) |
| 156 | : "Ir" (i), "m" (v->counter) |
| 157 | : "memory"); |
| 158 | } else if (cpu_has_llsc) { |
| 159 | unsigned long temp; |
| 160 | |
| 161 | __asm__ __volatile__( |
Maciej W. Rozycki | aac8aa7 | 2005-06-14 17:35:03 +0000 | [diff] [blame^] | 162 | " .set mips2 \n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | "1: ll %1, %2 # atomic_add_return \n" |
| 164 | " addu %0, %1, %3 \n" |
| 165 | " sc %0, %2 \n" |
| 166 | " beqz %0, 1b \n" |
| 167 | " addu %0, %1, %3 \n" |
| 168 | " sync \n" |
Maciej W. Rozycki | aac8aa7 | 2005-06-14 17:35:03 +0000 | [diff] [blame^] | 169 | " .set mips0 \n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | : "=&r" (result), "=&r" (temp), "=m" (v->counter) |
| 171 | : "Ir" (i), "m" (v->counter) |
| 172 | : "memory"); |
| 173 | } else { |
| 174 | unsigned long flags; |
| 175 | |
| 176 | spin_lock_irqsave(&atomic_lock, flags); |
| 177 | result = v->counter; |
| 178 | result += i; |
| 179 | v->counter = result; |
| 180 | spin_unlock_irqrestore(&atomic_lock, flags); |
| 181 | } |
| 182 | |
| 183 | return result; |
| 184 | } |
| 185 | |
| 186 | static __inline__ int atomic_sub_return(int i, atomic_t * v) |
| 187 | { |
| 188 | unsigned long result; |
| 189 | |
| 190 | if (cpu_has_llsc && R10000_LLSC_WAR) { |
| 191 | unsigned long temp; |
| 192 | |
| 193 | __asm__ __volatile__( |
Maciej W. Rozycki | aac8aa7 | 2005-06-14 17:35:03 +0000 | [diff] [blame^] | 194 | " .set mips2 \n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | "1: ll %1, %2 # atomic_sub_return \n" |
| 196 | " subu %0, %1, %3 \n" |
| 197 | " sc %0, %2 \n" |
| 198 | " beqzl %0, 1b \n" |
| 199 | " subu %0, %1, %3 \n" |
| 200 | " sync \n" |
Maciej W. Rozycki | aac8aa7 | 2005-06-14 17:35:03 +0000 | [diff] [blame^] | 201 | " .set mips0 \n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | : "=&r" (result), "=&r" (temp), "=m" (v->counter) |
| 203 | : "Ir" (i), "m" (v->counter) |
| 204 | : "memory"); |
| 205 | } else if (cpu_has_llsc) { |
| 206 | unsigned long temp; |
| 207 | |
| 208 | __asm__ __volatile__( |
Maciej W. Rozycki | aac8aa7 | 2005-06-14 17:35:03 +0000 | [diff] [blame^] | 209 | " .set mips2 \n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | "1: ll %1, %2 # atomic_sub_return \n" |
| 211 | " subu %0, %1, %3 \n" |
| 212 | " sc %0, %2 \n" |
| 213 | " beqz %0, 1b \n" |
| 214 | " subu %0, %1, %3 \n" |
| 215 | " sync \n" |
Maciej W. Rozycki | aac8aa7 | 2005-06-14 17:35:03 +0000 | [diff] [blame^] | 216 | " .set mips0 \n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | : "=&r" (result), "=&r" (temp), "=m" (v->counter) |
| 218 | : "Ir" (i), "m" (v->counter) |
| 219 | : "memory"); |
| 220 | } else { |
| 221 | unsigned long flags; |
| 222 | |
| 223 | spin_lock_irqsave(&atomic_lock, flags); |
| 224 | result = v->counter; |
| 225 | result -= i; |
| 226 | v->counter = result; |
| 227 | spin_unlock_irqrestore(&atomic_lock, flags); |
| 228 | } |
| 229 | |
| 230 | return result; |
| 231 | } |
| 232 | |
| 233 | /* |
| 234 | * atomic_sub_if_positive - add integer to atomic variable |
| 235 | * @v: pointer of type atomic_t |
| 236 | * |
| 237 | * Atomically test @v and decrement if it is greater than 0. |
| 238 | * The function returns the old value of @v minus 1. |
| 239 | */ |
| 240 | static __inline__ int atomic_sub_if_positive(int i, atomic_t * v) |
| 241 | { |
| 242 | unsigned long result; |
| 243 | |
| 244 | if (cpu_has_llsc && R10000_LLSC_WAR) { |
| 245 | unsigned long temp; |
| 246 | |
| 247 | __asm__ __volatile__( |
Maciej W. Rozycki | aac8aa7 | 2005-06-14 17:35:03 +0000 | [diff] [blame^] | 248 | " .set mips2 \n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | "1: ll %1, %2 # atomic_sub_if_positive\n" |
| 250 | " subu %0, %1, %3 \n" |
| 251 | " bltz %0, 1f \n" |
| 252 | " sc %0, %2 \n" |
| 253 | " beqzl %0, 1b \n" |
| 254 | " sync \n" |
| 255 | "1: \n" |
Maciej W. Rozycki | aac8aa7 | 2005-06-14 17:35:03 +0000 | [diff] [blame^] | 256 | " .set mips0 \n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | : "=&r" (result), "=&r" (temp), "=m" (v->counter) |
| 258 | : "Ir" (i), "m" (v->counter) |
| 259 | : "memory"); |
| 260 | } else if (cpu_has_llsc) { |
| 261 | unsigned long temp; |
| 262 | |
| 263 | __asm__ __volatile__( |
Maciej W. Rozycki | aac8aa7 | 2005-06-14 17:35:03 +0000 | [diff] [blame^] | 264 | " .set mips2 \n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | "1: ll %1, %2 # atomic_sub_if_positive\n" |
| 266 | " subu %0, %1, %3 \n" |
| 267 | " bltz %0, 1f \n" |
| 268 | " sc %0, %2 \n" |
| 269 | " beqz %0, 1b \n" |
| 270 | " sync \n" |
| 271 | "1: \n" |
Maciej W. Rozycki | aac8aa7 | 2005-06-14 17:35:03 +0000 | [diff] [blame^] | 272 | " .set mips0 \n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | : "=&r" (result), "=&r" (temp), "=m" (v->counter) |
| 274 | : "Ir" (i), "m" (v->counter) |
| 275 | : "memory"); |
| 276 | } else { |
| 277 | unsigned long flags; |
| 278 | |
| 279 | spin_lock_irqsave(&atomic_lock, flags); |
| 280 | result = v->counter; |
| 281 | result -= i; |
| 282 | if (result >= 0) |
| 283 | v->counter = result; |
| 284 | spin_unlock_irqrestore(&atomic_lock, flags); |
| 285 | } |
| 286 | |
| 287 | return result; |
| 288 | } |
| 289 | |
| 290 | #define atomic_dec_return(v) atomic_sub_return(1,(v)) |
| 291 | #define atomic_inc_return(v) atomic_add_return(1,(v)) |
| 292 | |
| 293 | /* |
| 294 | * atomic_sub_and_test - subtract value from variable and test result |
| 295 | * @i: integer value to subtract |
| 296 | * @v: pointer of type atomic_t |
| 297 | * |
| 298 | * Atomically subtracts @i from @v and returns |
| 299 | * true if the result is zero, or false for all |
| 300 | * other cases. |
| 301 | */ |
| 302 | #define atomic_sub_and_test(i,v) (atomic_sub_return((i), (v)) == 0) |
| 303 | |
| 304 | /* |
| 305 | * atomic_inc_and_test - increment and test |
| 306 | * @v: pointer of type atomic_t |
| 307 | * |
| 308 | * Atomically increments @v by 1 |
| 309 | * and returns true if the result is zero, or false for all |
| 310 | * other cases. |
| 311 | */ |
| 312 | #define atomic_inc_and_test(v) (atomic_inc_return(v) == 0) |
| 313 | |
| 314 | /* |
| 315 | * atomic_dec_and_test - decrement by 1 and test |
| 316 | * @v: pointer of type atomic_t |
| 317 | * |
| 318 | * Atomically decrements @v by 1 and |
| 319 | * returns true if the result is 0, or false for all other |
| 320 | * cases. |
| 321 | */ |
| 322 | #define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0) |
| 323 | |
| 324 | /* |
| 325 | * atomic_dec_if_positive - decrement by 1 if old value positive |
| 326 | * @v: pointer of type atomic_t |
| 327 | */ |
| 328 | #define atomic_dec_if_positive(v) atomic_sub_if_positive(1, v) |
| 329 | |
| 330 | /* |
| 331 | * atomic_inc - increment atomic variable |
| 332 | * @v: pointer of type atomic_t |
| 333 | * |
| 334 | * Atomically increments @v by 1. |
| 335 | */ |
| 336 | #define atomic_inc(v) atomic_add(1,(v)) |
| 337 | |
| 338 | /* |
| 339 | * atomic_dec - decrement and test |
| 340 | * @v: pointer of type atomic_t |
| 341 | * |
| 342 | * Atomically decrements @v by 1. |
| 343 | */ |
| 344 | #define atomic_dec(v) atomic_sub(1,(v)) |
| 345 | |
| 346 | /* |
| 347 | * atomic_add_negative - add and test if negative |
| 348 | * @v: pointer of type atomic_t |
| 349 | * @i: integer value to add |
| 350 | * |
| 351 | * Atomically adds @i to @v and returns true |
| 352 | * if the result is negative, or false when |
| 353 | * result is greater than or equal to zero. |
| 354 | */ |
| 355 | #define atomic_add_negative(i,v) (atomic_add_return(i, (v)) < 0) |
| 356 | |
Ralf Baechle | 875d43e | 2005-09-03 15:56:16 -0700 | [diff] [blame] | 357 | #ifdef CONFIG_64BIT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | |
| 359 | typedef struct { volatile __s64 counter; } atomic64_t; |
| 360 | |
| 361 | #define ATOMIC64_INIT(i) { (i) } |
| 362 | |
| 363 | /* |
| 364 | * atomic64_read - read atomic variable |
| 365 | * @v: pointer of type atomic64_t |
| 366 | * |
| 367 | */ |
| 368 | #define atomic64_read(v) ((v)->counter) |
| 369 | |
| 370 | /* |
| 371 | * atomic64_set - set atomic variable |
| 372 | * @v: pointer of type atomic64_t |
| 373 | * @i: required value |
| 374 | */ |
| 375 | #define atomic64_set(v,i) ((v)->counter = (i)) |
| 376 | |
| 377 | /* |
| 378 | * atomic64_add - add integer to atomic variable |
| 379 | * @i: integer value to add |
| 380 | * @v: pointer of type atomic64_t |
| 381 | * |
| 382 | * Atomically adds @i to @v. |
| 383 | */ |
| 384 | static __inline__ void atomic64_add(long i, atomic64_t * v) |
| 385 | { |
| 386 | if (cpu_has_llsc && R10000_LLSC_WAR) { |
| 387 | unsigned long temp; |
| 388 | |
| 389 | __asm__ __volatile__( |
Maciej W. Rozycki | aac8aa7 | 2005-06-14 17:35:03 +0000 | [diff] [blame^] | 390 | " .set mips3 \n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | "1: lld %0, %1 # atomic64_add \n" |
| 392 | " addu %0, %2 \n" |
| 393 | " scd %0, %1 \n" |
| 394 | " beqzl %0, 1b \n" |
Maciej W. Rozycki | aac8aa7 | 2005-06-14 17:35:03 +0000 | [diff] [blame^] | 395 | " .set mips0 \n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | : "=&r" (temp), "=m" (v->counter) |
| 397 | : "Ir" (i), "m" (v->counter)); |
| 398 | } else if (cpu_has_llsc) { |
| 399 | unsigned long temp; |
| 400 | |
| 401 | __asm__ __volatile__( |
Maciej W. Rozycki | aac8aa7 | 2005-06-14 17:35:03 +0000 | [diff] [blame^] | 402 | " .set mips3 \n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | "1: lld %0, %1 # atomic64_add \n" |
| 404 | " addu %0, %2 \n" |
| 405 | " scd %0, %1 \n" |
| 406 | " beqz %0, 1b \n" |
Maciej W. Rozycki | aac8aa7 | 2005-06-14 17:35:03 +0000 | [diff] [blame^] | 407 | " .set mips0 \n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | : "=&r" (temp), "=m" (v->counter) |
| 409 | : "Ir" (i), "m" (v->counter)); |
| 410 | } else { |
| 411 | unsigned long flags; |
| 412 | |
| 413 | spin_lock_irqsave(&atomic_lock, flags); |
| 414 | v->counter += i; |
| 415 | spin_unlock_irqrestore(&atomic_lock, flags); |
| 416 | } |
| 417 | } |
| 418 | |
| 419 | /* |
| 420 | * atomic64_sub - subtract the atomic variable |
| 421 | * @i: integer value to subtract |
| 422 | * @v: pointer of type atomic64_t |
| 423 | * |
| 424 | * Atomically subtracts @i from @v. |
| 425 | */ |
| 426 | static __inline__ void atomic64_sub(long i, atomic64_t * v) |
| 427 | { |
| 428 | if (cpu_has_llsc && R10000_LLSC_WAR) { |
| 429 | unsigned long temp; |
| 430 | |
| 431 | __asm__ __volatile__( |
Maciej W. Rozycki | aac8aa7 | 2005-06-14 17:35:03 +0000 | [diff] [blame^] | 432 | " .set mips3 \n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | "1: lld %0, %1 # atomic64_sub \n" |
| 434 | " subu %0, %2 \n" |
| 435 | " scd %0, %1 \n" |
| 436 | " beqzl %0, 1b \n" |
Maciej W. Rozycki | aac8aa7 | 2005-06-14 17:35:03 +0000 | [diff] [blame^] | 437 | " .set mips0 \n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | : "=&r" (temp), "=m" (v->counter) |
| 439 | : "Ir" (i), "m" (v->counter)); |
| 440 | } else if (cpu_has_llsc) { |
| 441 | unsigned long temp; |
| 442 | |
| 443 | __asm__ __volatile__( |
Maciej W. Rozycki | aac8aa7 | 2005-06-14 17:35:03 +0000 | [diff] [blame^] | 444 | " .set mips3 \n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | "1: lld %0, %1 # atomic64_sub \n" |
| 446 | " subu %0, %2 \n" |
| 447 | " scd %0, %1 \n" |
| 448 | " beqz %0, 1b \n" |
Maciej W. Rozycki | aac8aa7 | 2005-06-14 17:35:03 +0000 | [diff] [blame^] | 449 | " .set mips0 \n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | : "=&r" (temp), "=m" (v->counter) |
| 451 | : "Ir" (i), "m" (v->counter)); |
| 452 | } else { |
| 453 | unsigned long flags; |
| 454 | |
| 455 | spin_lock_irqsave(&atomic_lock, flags); |
| 456 | v->counter -= i; |
| 457 | spin_unlock_irqrestore(&atomic_lock, flags); |
| 458 | } |
| 459 | } |
| 460 | |
| 461 | /* |
| 462 | * Same as above, but return the result value |
| 463 | */ |
| 464 | static __inline__ long atomic64_add_return(long i, atomic64_t * v) |
| 465 | { |
| 466 | unsigned long result; |
| 467 | |
| 468 | if (cpu_has_llsc && R10000_LLSC_WAR) { |
| 469 | unsigned long temp; |
| 470 | |
| 471 | __asm__ __volatile__( |
Maciej W. Rozycki | aac8aa7 | 2005-06-14 17:35:03 +0000 | [diff] [blame^] | 472 | " .set mips3 \n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | "1: lld %1, %2 # atomic64_add_return \n" |
| 474 | " addu %0, %1, %3 \n" |
| 475 | " scd %0, %2 \n" |
| 476 | " beqzl %0, 1b \n" |
| 477 | " addu %0, %1, %3 \n" |
| 478 | " sync \n" |
Maciej W. Rozycki | aac8aa7 | 2005-06-14 17:35:03 +0000 | [diff] [blame^] | 479 | " .set mips0 \n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | : "=&r" (result), "=&r" (temp), "=m" (v->counter) |
| 481 | : "Ir" (i), "m" (v->counter) |
| 482 | : "memory"); |
| 483 | } else if (cpu_has_llsc) { |
| 484 | unsigned long temp; |
| 485 | |
| 486 | __asm__ __volatile__( |
Maciej W. Rozycki | aac8aa7 | 2005-06-14 17:35:03 +0000 | [diff] [blame^] | 487 | " .set mips3 \n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | "1: lld %1, %2 # atomic64_add_return \n" |
| 489 | " addu %0, %1, %3 \n" |
| 490 | " scd %0, %2 \n" |
| 491 | " beqz %0, 1b \n" |
| 492 | " addu %0, %1, %3 \n" |
| 493 | " sync \n" |
Maciej W. Rozycki | aac8aa7 | 2005-06-14 17:35:03 +0000 | [diff] [blame^] | 494 | " .set mips0 \n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | : "=&r" (result), "=&r" (temp), "=m" (v->counter) |
| 496 | : "Ir" (i), "m" (v->counter) |
| 497 | : "memory"); |
| 498 | } else { |
| 499 | unsigned long flags; |
| 500 | |
| 501 | spin_lock_irqsave(&atomic_lock, flags); |
| 502 | result = v->counter; |
| 503 | result += i; |
| 504 | v->counter = result; |
| 505 | spin_unlock_irqrestore(&atomic_lock, flags); |
| 506 | } |
| 507 | |
| 508 | return result; |
| 509 | } |
| 510 | |
| 511 | static __inline__ long atomic64_sub_return(long i, atomic64_t * v) |
| 512 | { |
| 513 | unsigned long result; |
| 514 | |
| 515 | if (cpu_has_llsc && R10000_LLSC_WAR) { |
| 516 | unsigned long temp; |
| 517 | |
| 518 | __asm__ __volatile__( |
Maciej W. Rozycki | aac8aa7 | 2005-06-14 17:35:03 +0000 | [diff] [blame^] | 519 | " .set mips3 \n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | "1: lld %1, %2 # atomic64_sub_return \n" |
| 521 | " subu %0, %1, %3 \n" |
| 522 | " scd %0, %2 \n" |
| 523 | " beqzl %0, 1b \n" |
| 524 | " subu %0, %1, %3 \n" |
| 525 | " sync \n" |
Maciej W. Rozycki | aac8aa7 | 2005-06-14 17:35:03 +0000 | [diff] [blame^] | 526 | " .set mips0 \n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 527 | : "=&r" (result), "=&r" (temp), "=m" (v->counter) |
| 528 | : "Ir" (i), "m" (v->counter) |
| 529 | : "memory"); |
| 530 | } else if (cpu_has_llsc) { |
| 531 | unsigned long temp; |
| 532 | |
| 533 | __asm__ __volatile__( |
Maciej W. Rozycki | aac8aa7 | 2005-06-14 17:35:03 +0000 | [diff] [blame^] | 534 | " .set mips3 \n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | "1: lld %1, %2 # atomic64_sub_return \n" |
| 536 | " subu %0, %1, %3 \n" |
| 537 | " scd %0, %2 \n" |
| 538 | " beqz %0, 1b \n" |
| 539 | " subu %0, %1, %3 \n" |
| 540 | " sync \n" |
Maciej W. Rozycki | aac8aa7 | 2005-06-14 17:35:03 +0000 | [diff] [blame^] | 541 | " .set mips0 \n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 542 | : "=&r" (result), "=&r" (temp), "=m" (v->counter) |
| 543 | : "Ir" (i), "m" (v->counter) |
| 544 | : "memory"); |
| 545 | } else { |
| 546 | unsigned long flags; |
| 547 | |
| 548 | spin_lock_irqsave(&atomic_lock, flags); |
| 549 | result = v->counter; |
| 550 | result -= i; |
| 551 | v->counter = result; |
| 552 | spin_unlock_irqrestore(&atomic_lock, flags); |
| 553 | } |
| 554 | |
| 555 | return result; |
| 556 | } |
| 557 | |
| 558 | /* |
| 559 | * atomic64_sub_if_positive - add integer to atomic variable |
| 560 | * @v: pointer of type atomic64_t |
| 561 | * |
| 562 | * Atomically test @v and decrement if it is greater than 0. |
| 563 | * The function returns the old value of @v minus 1. |
| 564 | */ |
| 565 | static __inline__ long atomic64_sub_if_positive(long i, atomic64_t * v) |
| 566 | { |
| 567 | unsigned long result; |
| 568 | |
| 569 | if (cpu_has_llsc && R10000_LLSC_WAR) { |
| 570 | unsigned long temp; |
| 571 | |
| 572 | __asm__ __volatile__( |
Maciej W. Rozycki | aac8aa7 | 2005-06-14 17:35:03 +0000 | [diff] [blame^] | 573 | " .set mips3 \n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | "1: lld %1, %2 # atomic64_sub_if_positive\n" |
| 575 | " dsubu %0, %1, %3 \n" |
| 576 | " bltz %0, 1f \n" |
| 577 | " scd %0, %2 \n" |
| 578 | " beqzl %0, 1b \n" |
| 579 | " sync \n" |
| 580 | "1: \n" |
Maciej W. Rozycki | aac8aa7 | 2005-06-14 17:35:03 +0000 | [diff] [blame^] | 581 | " .set mips0 \n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | : "=&r" (result), "=&r" (temp), "=m" (v->counter) |
| 583 | : "Ir" (i), "m" (v->counter) |
| 584 | : "memory"); |
| 585 | } else if (cpu_has_llsc) { |
| 586 | unsigned long temp; |
| 587 | |
| 588 | __asm__ __volatile__( |
Maciej W. Rozycki | aac8aa7 | 2005-06-14 17:35:03 +0000 | [diff] [blame^] | 589 | " .set mips3 \n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | "1: lld %1, %2 # atomic64_sub_if_positive\n" |
| 591 | " dsubu %0, %1, %3 \n" |
| 592 | " bltz %0, 1f \n" |
| 593 | " scd %0, %2 \n" |
| 594 | " beqz %0, 1b \n" |
| 595 | " sync \n" |
| 596 | "1: \n" |
Maciej W. Rozycki | aac8aa7 | 2005-06-14 17:35:03 +0000 | [diff] [blame^] | 597 | " .set mips0 \n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 598 | : "=&r" (result), "=&r" (temp), "=m" (v->counter) |
| 599 | : "Ir" (i), "m" (v->counter) |
| 600 | : "memory"); |
| 601 | } else { |
| 602 | unsigned long flags; |
| 603 | |
| 604 | spin_lock_irqsave(&atomic_lock, flags); |
| 605 | result = v->counter; |
| 606 | result -= i; |
| 607 | if (result >= 0) |
| 608 | v->counter = result; |
| 609 | spin_unlock_irqrestore(&atomic_lock, flags); |
| 610 | } |
| 611 | |
| 612 | return result; |
| 613 | } |
| 614 | |
| 615 | #define atomic64_dec_return(v) atomic64_sub_return(1,(v)) |
| 616 | #define atomic64_inc_return(v) atomic64_add_return(1,(v)) |
| 617 | |
| 618 | /* |
| 619 | * atomic64_sub_and_test - subtract value from variable and test result |
| 620 | * @i: integer value to subtract |
| 621 | * @v: pointer of type atomic64_t |
| 622 | * |
| 623 | * Atomically subtracts @i from @v and returns |
| 624 | * true if the result is zero, or false for all |
| 625 | * other cases. |
| 626 | */ |
| 627 | #define atomic64_sub_and_test(i,v) (atomic64_sub_return((i), (v)) == 0) |
| 628 | |
| 629 | /* |
| 630 | * atomic64_inc_and_test - increment and test |
| 631 | * @v: pointer of type atomic64_t |
| 632 | * |
| 633 | * Atomically increments @v by 1 |
| 634 | * and returns true if the result is zero, or false for all |
| 635 | * other cases. |
| 636 | */ |
| 637 | #define atomic64_inc_and_test(v) (atomic64_inc_return(v) == 0) |
| 638 | |
| 639 | /* |
| 640 | * atomic64_dec_and_test - decrement by 1 and test |
| 641 | * @v: pointer of type atomic64_t |
| 642 | * |
| 643 | * Atomically decrements @v by 1 and |
| 644 | * returns true if the result is 0, or false for all other |
| 645 | * cases. |
| 646 | */ |
| 647 | #define atomic64_dec_and_test(v) (atomic64_sub_return(1, (v)) == 0) |
| 648 | |
| 649 | /* |
| 650 | * atomic64_dec_if_positive - decrement by 1 if old value positive |
| 651 | * @v: pointer of type atomic64_t |
| 652 | */ |
| 653 | #define atomic64_dec_if_positive(v) atomic64_sub_if_positive(1, v) |
| 654 | |
| 655 | /* |
| 656 | * atomic64_inc - increment atomic variable |
| 657 | * @v: pointer of type atomic64_t |
| 658 | * |
| 659 | * Atomically increments @v by 1. |
| 660 | */ |
| 661 | #define atomic64_inc(v) atomic64_add(1,(v)) |
| 662 | |
| 663 | /* |
| 664 | * atomic64_dec - decrement and test |
| 665 | * @v: pointer of type atomic64_t |
| 666 | * |
| 667 | * Atomically decrements @v by 1. |
| 668 | */ |
| 669 | #define atomic64_dec(v) atomic64_sub(1,(v)) |
| 670 | |
| 671 | /* |
| 672 | * atomic64_add_negative - add and test if negative |
| 673 | * @v: pointer of type atomic64_t |
| 674 | * @i: integer value to add |
| 675 | * |
| 676 | * Atomically adds @i to @v and returns true |
| 677 | * if the result is negative, or false when |
| 678 | * result is greater than or equal to zero. |
| 679 | */ |
| 680 | #define atomic64_add_negative(i,v) (atomic64_add_return(i, (v)) < 0) |
| 681 | |
Ralf Baechle | 875d43e | 2005-09-03 15:56:16 -0700 | [diff] [blame] | 682 | #endif /* CONFIG_64BIT */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 683 | |
| 684 | /* |
| 685 | * atomic*_return operations are serializing but not the non-*_return |
| 686 | * versions. |
| 687 | */ |
| 688 | #define smp_mb__before_atomic_dec() smp_mb() |
| 689 | #define smp_mb__after_atomic_dec() smp_mb() |
| 690 | #define smp_mb__before_atomic_inc() smp_mb() |
| 691 | #define smp_mb__after_atomic_inc() smp_mb() |
| 692 | |
| 693 | #endif /* _ASM_ATOMIC_H */ |