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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. #include <arch/types.h>
  33.  
  34. typedef struct { volatile __u32 count; } atomic_t;
  35.  
  36. static inline void atomic_inc(atomic_t *val)
  37. {
  38.     __u32 tmp;
  39.  
  40.     asm __volatile__ (
  41.         "1:\n"
  42.         "lwarx %0, 0, %2\n"
  43.         "addic %0, %0, 1\n"
  44.         "stwcx. %0, 0, %2\n"
  45.         "bne- 1b"
  46.         : "=&r" (tmp), "=m" (val->count)
  47.         : "r" (&val->count), "m" (val->count)
  48.         : "cc");
  49. }
  50.  
  51. static inline void atomic_dec(atomic_t *val)
  52. {
  53.     __u32 tmp;
  54.  
  55.     asm __volatile__(
  56.         "1:\n"
  57.         "lwarx %0, 0, %2\n"
  58.         "addic %0, %0, -1\n"
  59.         "stwcx. %0, 0, %2\n"
  60.         "bne- 1b"
  61.         : "=&r" (tmp), "=m" (val->count)
  62.         : "r" (&val->count), "m" (val->count)
  63.         : "cc");
  64. }
  65.  
  66. static inline __u32 atomic_postinc(atomic_t *val)
  67. {
  68.     atomic_inc(val);
  69.     return val->count - 1;
  70. }
  71.  
  72. static inline __u32 atomic_postdec(atomic_t *val)
  73. {
  74.     atomic_dec(val);
  75.     return val->count + 1;
  76. }
  77.  
  78. static inline __u32 atomic_preinc(atomic_t *val)
  79. {
  80.     atomic_inc(val);
  81.     return val->count;
  82. }
  83.  
  84. static inline __u32 atomic_predec(atomic_t *val)
  85. {
  86.     atomic_dec(val);
  87.     return val->count;
  88. }
  89.  
  90. static inline void atomic_set(atomic_t *val, __u32 i)
  91. {
  92.     val->count = i;
  93. }
  94.  
  95. static inline __u32 atomic_get(atomic_t *val)
  96. {
  97.     return val->count;
  98. }
  99.  
  100. #endif
  101.