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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. /*
  37.  * TODO: these are just placeholders for real implementations of atomic_inc and atomic_dec.
  38.  * WARNING: the following functions cause the code to be preemption-unsafe !!!
  39.  */
  40.  
  41. static inline void atomic_inc(atomic_t *val) {
  42.     val->count++;
  43. }
  44.  
  45. static inline void atomic_dec(atomic_t *val) {
  46.     val->count--;
  47. }
  48.  
  49. static inline void atomic_set(atomic_t *val, __u32 i)
  50. {
  51.     val->count = i;
  52. }
  53.  
  54. static inline __u32 atomic_get(atomic_t *val)
  55. {
  56.     return val->count;
  57. }
  58.  
  59. #endif
  60.