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  1. /*
  2.  * Copyright (C) 2001-2004 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. #ifndef __ia32_ATOMIC_H__
  30. #define __ia32_ATOMIC_H__
  31.  
  32. #include <arch/types.h>
  33.  
  34. static inline void atomic_inc(volatile int *val) {
  35. #ifdef __SMP__
  36.     __asm__ volatile ("lock incl %0\n" : "=m" (*val));
  37. #else
  38.     __asm__ volatile ("incl %0\n" : "=m" (*val));
  39. #endif /* __SMP__ */
  40. }
  41.  
  42. static inline void atomic_dec(volatile int *val) {
  43. #ifdef __SMP__
  44.     __asm__ volatile ("lock decl %0\n" : "=m" (*val));
  45. #else
  46.     __asm__ volatile ("decl %0\n" : "=m" (*val));
  47. #endif /* __SMP__ */
  48. }
  49.  
  50. static inline int test_and_set(volatile int *val) {
  51.     int v;
  52.    
  53.     __asm__ volatile (
  54.         "movl $1, %0\n"
  55.         "xchgl %0, %1\n"
  56.         : "=r" (v),"=m" (*val)
  57.     );
  58.    
  59.     return v;
  60. }
  61.  
  62.  
  63. extern void spinlock_arch(volatile int *val);
  64.  
  65. #endif
  66.