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  1. /*
  2.  * Copyright (C) 2005 Martin Decky
  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 __ppc32_ATOMIC_H__
  30. #define __ppc32_ATOMIC_H__
  31.  
  32. static inline void atomic_inc(atomic_t *val)
  33. {
  34.     long tmp;
  35.  
  36.     asm __volatile__ (
  37.         "1:\n"
  38.         "lwarx %0, 0, %2\n"
  39.         "addic %0, %0, 1\n"
  40.         "stwcx. %0, 0, %2\n"
  41.         "bne- 1b"
  42.         : "=&r" (tmp), "=m" (val->count)
  43.         : "r" (&val->count), "m" (val->count)
  44.         : "cc");
  45. }
  46.  
  47. static inline void atomic_dec(atomic_t *val)
  48. {
  49.     long tmp;
  50.  
  51.     asm __volatile__(
  52.         "1:\n"
  53.         "lwarx %0, 0, %2\n"
  54.         "addic %0, %0, -1\n"
  55.         "stwcx. %0, 0, %2\n"
  56.         "bne- 1b"
  57.         : "=&r" (tmp), "=m" (val->count)
  58.         : "r" (&val->count), "m" (val->count)
  59.         : "cc");
  60. }
  61.  
  62. static inline long atomic_postinc(atomic_t *val)
  63. {
  64.     atomic_inc(val);
  65.     return val->count - 1;
  66. }
  67.  
  68. static inline long atomic_postdec(atomic_t *val)
  69. {
  70.     atomic_dec(val);
  71.     return val->count + 1;
  72. }
  73.  
  74. static inline long atomic_preinc(atomic_t *val)
  75. {
  76.     atomic_inc(val);
  77.     return val->count;
  78. }
  79.  
  80. static inline long atomic_predec(atomic_t *val)
  81. {
  82.     atomic_dec(val);
  83.     return val->count;
  84. }
  85.  
  86. #endif
  87.