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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. /** @addtogroup ia64   
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #ifndef KERN_ia64_ATOMIC_H_
  36. #define KERN_ia64_ATOMIC_H_
  37.  
  38. /** Atomic addition.
  39.  *
  40.  * @param val       Atomic value.
  41.  * @param imm       Value to add.
  42.  *
  43.  * @return      Value before addition.
  44.  */
  45. static inline long atomic_add(atomic_t *val, int imm)
  46. {
  47.     long v;
  48.  
  49.     asm volatile ("fetchadd8.rel %0 = %1, %2\n" : "=r" (v),
  50.         "+m" (val->count) : "i" (imm));
  51.  
  52.     return v;
  53. }
  54.  
  55. static inline uint64_t test_and_set(atomic_t *val)
  56. {
  57.     uint64_t v;
  58.        
  59.     asm volatile (
  60.         "movl %0 = 0x1;;\n"
  61.         "xchg8 %0 = %1, %0;;\n"
  62.         : "=r" (v), "+m" (val->count)
  63.     );
  64.    
  65.     return v;
  66. }
  67.  
  68. static inline void atomic_lock_arch(atomic_t *val)
  69. {
  70.     do {
  71.         while (val->count)
  72.             ;
  73.     } while (test_and_set(val));
  74. }
  75.  
  76. static inline void atomic_inc(atomic_t *val)
  77. {
  78.     atomic_add(val, 1);
  79. }
  80.  
  81. static inline void atomic_dec(atomic_t *val)
  82. {
  83.     atomic_add(val, -1);
  84. }
  85.  
  86. static inline long atomic_preinc(atomic_t *val)
  87. {
  88.     return atomic_add(val, 1) + 1;
  89. }
  90.  
  91. static inline long atomic_predec(atomic_t *val)
  92. {
  93.     return atomic_add(val, -1) - 1;
  94. }
  95.  
  96. static inline long atomic_postinc(atomic_t *val)
  97. {
  98.     return atomic_add(val, 1);
  99. }
  100.  
  101. static inline long atomic_postdec(atomic_t *val)
  102. {
  103.     return atomic_add(val, -1);
  104. }
  105.  
  106. #endif
  107.  
  108. /** @}
  109.  */
  110.