atomic.h 1.8 KB

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  1. /*
  2. * PowerPC atomic operations
  3. */
  4. #ifndef _ASM_PPC_ATOMIC_H_
  5. #define _ASM_PPC_ATOMIC_H_
  6. #include <linux/config.h>
  7. #ifdef CONFIG_SMP
  8. typedef struct { volatile int counter; } atomic_t;
  9. #else
  10. typedef struct { int counter; } atomic_t;
  11. #endif
  12. #define ATOMIC_INIT(i) { (i) }
  13. #define atomic_read(v) ((v)->counter)
  14. #define atomic_set(v,i) (((v)->counter) = (i))
  15. extern void atomic_clear_mask(unsigned long mask, unsigned long *addr);
  16. extern void atomic_set_mask(unsigned long mask, unsigned long *addr);
  17. extern __inline__ int atomic_add_return(int a, atomic_t *v)
  18. {
  19. int t;
  20. __asm__ __volatile__("\n\
  21. 1: lwarx %0,0,%3\n\
  22. add %0,%2,%0\n\
  23. stwcx. %0,0,%3\n\
  24. bne- 1b"
  25. : "=&r" (t), "=m" (*v)
  26. : "r" (a), "r" (v), "m" (*v)
  27. : "cc");
  28. return t;
  29. }
  30. extern __inline__ int atomic_sub_return(int a, atomic_t *v)
  31. {
  32. int t;
  33. __asm__ __volatile__("\n\
  34. 1: lwarx %0,0,%3\n\
  35. subf %0,%2,%0\n\
  36. stwcx. %0,0,%3\n\
  37. bne- 1b"
  38. : "=&r" (t), "=m" (*v)
  39. : "r" (a), "r" (v), "m" (*v)
  40. : "cc");
  41. return t;
  42. }
  43. extern __inline__ int atomic_inc_return(atomic_t *v)
  44. {
  45. int t;
  46. __asm__ __volatile__("\n\
  47. 1: lwarx %0,0,%2\n\
  48. addic %0,%0,1\n\
  49. stwcx. %0,0,%2\n\
  50. bne- 1b"
  51. : "=&r" (t), "=m" (*v)
  52. : "r" (v), "m" (*v)
  53. : "cc");
  54. return t;
  55. }
  56. extern __inline__ int atomic_dec_return(atomic_t *v)
  57. {
  58. int t;
  59. __asm__ __volatile__("\n\
  60. 1: lwarx %0,0,%2\n\
  61. addic %0,%0,-1\n\
  62. stwcx. %0,0,%2\n\
  63. bne 1b"
  64. : "=&r" (t), "=m" (*v)
  65. : "r" (v), "m" (*v)
  66. : "cc");
  67. return t;
  68. }
  69. #define atomic_add(a, v) ((void) atomic_add_return((a), (v)))
  70. #define atomic_sub(a, v) ((void) atomic_sub_return((a), (v)))
  71. #define atomic_sub_and_test(a, v) (atomic_sub_return((a), (v)) == 0)
  72. #define atomic_inc(v) ((void) atomic_inc_return((v)))
  73. #define atomic_dec(v) ((void) atomic_dec_return((v)))
  74. #define atomic_dec_and_test(v) (atomic_dec_return((v)) == 0)
  75. #endif /* _ASM_PPC_ATOMIC_H_ */