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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. /** @addtogroup ia64   
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #ifndef KERN_ia64_ATOMIC_H_
  36. #define KERN_ia64_ATOMIC_H_
  37.  
  38. /** Atomic addition.
  39.  *
  40.  * @param val Atomic value.
  41.  * @param imm Value to add.
  42.  *
  43.  * @return Value before addition.
  44.  */
  45. static inline long atomic_add(atomic_t *val, int imm)
  46. {
  47.     long v;
  48.  
  49.     __asm__ volatile ("fetchadd8.rel %0 = %1, %2\n" : "=r" (v), "+m" (val->count) : "i" (imm));
  50.  
  51.     return v;
  52. }
  53.  
  54. static inline void atomic_inc(atomic_t *val) { atomic_add(val, 1); }
  55. static inline void atomic_dec(atomic_t *val) { atomic_add(val, -1); }
  56.  
  57. static inline long atomic_preinc(atomic_t *val) { return atomic_add(val, 1) + 1; }
  58. static inline long atomic_predec(atomic_t *val) { return atomic_add(val, -1) - 1; }
  59.  
  60. static inline long atomic_postinc(atomic_t *val) { return atomic_add(val, 1); }
  61. static inline long atomic_postdec(atomic_t *val) { return atomic_add(val, -1); }
  62.  
  63. #endif
  64.  
  65. /** @}
  66.  */
  67.