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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. #include <arch/types.h>
  33.  
  34. typedef struct { volatile __u64 count; } atomic_t;
  35.  
  36. /** Atomic addition.
  37.  *
  38.  * @param val Atomic value.
  39.  * @param imm Value to add.
  40.  *
  41.  * @return Value before addition.
  42.  */
  43. static inline count_t atomic_add(atomic_t *val, int imm)
  44. {
  45.     count_t v;
  46.  
  47.     __asm__ volatile ("fetchadd8.rel %0 = %1, %2\n" : "=r" (v), "+m" (val->count) : "i" (imm));
  48.  
  49.     return v;
  50. }
  51.  
  52. static inline void atomic_set(atomic_t *val, __u64 i)
  53. {
  54.     val->count = i;
  55. }
  56.  
  57. static inline __u32 atomic_get(atomic_t *val)
  58. {
  59.     return val->count;
  60. }
  61.  
  62. static inline void atomic_inc(atomic_t *val) { atomic_add(val, 1); }
  63. static inline void atomic_dec(atomic_t *val) { atomic_add(val, -1); }
  64.  
  65. static inline count_t atomic_preinc(atomic_t *val) { return atomic_add(val, 1) + 1; }
  66. static inline count_t atomic_predec(atomic_t *val) { return atomic_add(val, -1) - 1; }
  67.  
  68. static inline count_t atomic_postinc(atomic_t *val) { return atomic_add(val, 1); }
  69. static inline count_t atomic_postdec(atomic_t *val) { return atomic_add(val, -1); }
  70.  
  71. #endif
  72.