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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. #define atomic_inc_pre(x) (atomic_inc(x) - 1)
  35. #define atomic_dec_pre(x) (atomic_dec(x) + 1)
  36.  
  37. #define atomic_inc_post(x) atomic_inc(x)
  38. #define atomic_dec_post(x) atomic_dec(x)
  39.  
  40. typedef struct { volatile __u32 count; } atomic_t;
  41.  
  42. static inline void atomic_inc(atomic_t *val) {
  43.     __u32 tmp;
  44.  
  45.     asm __volatile__ (
  46.         "1:\n"
  47.         "lwarx %0, 0, %2\n"
  48.         "addic %0, %0, 1\n"
  49.         "stwcx. %0, 0, %2\n"
  50.         "bne- 1b"
  51.         : "=&r" (tmp), "=m" (val->count)
  52.         : "r" (&val->count), "m" (val->count)
  53.         : "cc");
  54. }
  55.  
  56. static inline void atomic_dec(atomic_t *val) {
  57.     __u32 tmp;
  58.  
  59.     asm __volatile__(
  60.         "1:\n"
  61.         "lwarx %0, 0, %2\n"
  62.         "addic %0, %0, -1\n"
  63.         "stwcx. %0, 0, %2\n"
  64.         "bne- 1b"
  65.         : "=&r" (tmp), "=m" (val->count)
  66.         : "r" (&val->count), "m" (val->count)
  67.         : "cc");
  68. }
  69.  
  70. static inline void atomic_set(atomic_t *val, __u32 i)
  71. {
  72.     val->count = i;
  73. }
  74.  
  75. static inline __u32 atomic_get(atomic_t *val)
  76. {
  77.     return val->count;
  78. }
  79.  
  80. #endif
  81.