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  1. /*
  2.  * Copyright (C) 2005 Jakub Jermar
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. #ifndef __ia64_ATOMIC_H__
  30. #define __ia64_ATOMIC_H__
  31.  
  32. /** Atomic addition.
  33.  *
  34.  * @param val Atomic value.
  35.  * @param imm Value to add.
  36.  *
  37.  * @return Value before addition.
  38.  */
  39. static inline long atomic_add(atomic_t *val, int imm)
  40. {
  41.     long v;
  42.  
  43.     __asm__ volatile ("fetchadd8.rel %0 = %1, %2\n" : "=r" (v), "+m" (val->count) : "i" (imm));
  44.  
  45.     return v;
  46. }
  47.  
  48. static inline void atomic_inc(atomic_t *val) { atomic_add(val, 1); }
  49. static inline void atomic_dec(atomic_t *val) { atomic_add(val, -1); }
  50.  
  51. static inline long atomic_preinc(atomic_t *val) { return atomic_add(val, 1) + 1; }
  52. static inline long atomic_predec(atomic_t *val) { return atomic_add(val, -1) - 1; }
  53.  
  54. static inline long atomic_postinc(atomic_t *val) { return atomic_add(val, 1); }
  55. static inline long atomic_postdec(atomic_t *val) { return atomic_add(val, -1); }
  56.  
  57. #endif
  58.