1a47a12beSStefan Roese /*
2a47a12beSStefan Roese * PowerPC atomic operations
3a47a12beSStefan Roese */
4a47a12beSStefan Roese
5a47a12beSStefan Roese #ifndef _ASM_PPC_ATOMIC_H_
6a47a12beSStefan Roese #define _ASM_PPC_ATOMIC_H_
7a47a12beSStefan Roese
8a47a12beSStefan Roese #ifdef CONFIG_SMP
9a47a12beSStefan Roese typedef struct { volatile int counter; } atomic_t;
10a47a12beSStefan Roese #else
11a47a12beSStefan Roese typedef struct { int counter; } atomic_t;
12a47a12beSStefan Roese #endif
13a47a12beSStefan Roese
14a47a12beSStefan Roese #define ATOMIC_INIT(i) { (i) }
15a47a12beSStefan Roese
16a47a12beSStefan Roese #define atomic_read(v) ((v)->counter)
17a47a12beSStefan Roese #define atomic_set(v,i) (((v)->counter) = (i))
18a47a12beSStefan Roese
19a47a12beSStefan Roese extern void atomic_clear_mask(unsigned long mask, unsigned long *addr);
20a47a12beSStefan Roese extern void atomic_set_mask(unsigned long mask, unsigned long *addr);
21a47a12beSStefan Roese
atomic_add_return(int a,atomic_t * v)22*44d0677aSMåns Rullgård static __inline__ int atomic_add_return(int a, atomic_t *v)
23a47a12beSStefan Roese {
24a47a12beSStefan Roese int t;
25a47a12beSStefan Roese
26a47a12beSStefan Roese __asm__ __volatile__("\n\
27a47a12beSStefan Roese 1: lwarx %0,0,%3\n\
28a47a12beSStefan Roese add %0,%2,%0\n\
29a47a12beSStefan Roese stwcx. %0,0,%3\n\
30a47a12beSStefan Roese bne- 1b"
31a47a12beSStefan Roese : "=&r" (t), "=m" (*v)
32a47a12beSStefan Roese : "r" (a), "r" (v), "m" (*v)
33a47a12beSStefan Roese : "cc");
34a47a12beSStefan Roese
35a47a12beSStefan Roese return t;
36a47a12beSStefan Roese }
37a47a12beSStefan Roese
atomic_sub_return(int a,atomic_t * v)38*44d0677aSMåns Rullgård static __inline__ int atomic_sub_return(int a, atomic_t *v)
39a47a12beSStefan Roese {
40a47a12beSStefan Roese int t;
41a47a12beSStefan Roese
42a47a12beSStefan Roese __asm__ __volatile__("\n\
43a47a12beSStefan Roese 1: lwarx %0,0,%3\n\
44a47a12beSStefan Roese subf %0,%2,%0\n\
45a47a12beSStefan Roese stwcx. %0,0,%3\n\
46a47a12beSStefan Roese bne- 1b"
47a47a12beSStefan Roese : "=&r" (t), "=m" (*v)
48a47a12beSStefan Roese : "r" (a), "r" (v), "m" (*v)
49a47a12beSStefan Roese : "cc");
50a47a12beSStefan Roese
51a47a12beSStefan Roese return t;
52a47a12beSStefan Roese }
53a47a12beSStefan Roese
atomic_inc_return(atomic_t * v)54*44d0677aSMåns Rullgård static __inline__ int atomic_inc_return(atomic_t *v)
55a47a12beSStefan Roese {
56a47a12beSStefan Roese int t;
57a47a12beSStefan Roese
58a47a12beSStefan Roese __asm__ __volatile__("\n\
59a47a12beSStefan Roese 1: lwarx %0,0,%2\n\
60a47a12beSStefan Roese addic %0,%0,1\n\
61a47a12beSStefan Roese stwcx. %0,0,%2\n\
62a47a12beSStefan Roese bne- 1b"
63a47a12beSStefan Roese : "=&r" (t), "=m" (*v)
64a47a12beSStefan Roese : "r" (v), "m" (*v)
65a47a12beSStefan Roese : "cc");
66a47a12beSStefan Roese
67a47a12beSStefan Roese return t;
68a47a12beSStefan Roese }
69a47a12beSStefan Roese
atomic_dec_return(atomic_t * v)70*44d0677aSMåns Rullgård static __inline__ int atomic_dec_return(atomic_t *v)
71a47a12beSStefan Roese {
72a47a12beSStefan Roese int t;
73a47a12beSStefan Roese
74a47a12beSStefan Roese __asm__ __volatile__("\n\
75a47a12beSStefan Roese 1: lwarx %0,0,%2\n\
76a47a12beSStefan Roese addic %0,%0,-1\n\
77a47a12beSStefan Roese stwcx. %0,0,%2\n\
78a47a12beSStefan Roese bne 1b"
79a47a12beSStefan Roese : "=&r" (t), "=m" (*v)
80a47a12beSStefan Roese : "r" (v), "m" (*v)
81a47a12beSStefan Roese : "cc");
82a47a12beSStefan Roese
83a47a12beSStefan Roese return t;
84a47a12beSStefan Roese }
85a47a12beSStefan Roese
86a47a12beSStefan Roese #define atomic_add(a, v) ((void) atomic_add_return((a), (v)))
87a47a12beSStefan Roese #define atomic_sub(a, v) ((void) atomic_sub_return((a), (v)))
88a47a12beSStefan Roese #define atomic_sub_and_test(a, v) (atomic_sub_return((a), (v)) == 0)
89a47a12beSStefan Roese #define atomic_inc(v) ((void) atomic_inc_return((v)))
90a47a12beSStefan Roese #define atomic_dec(v) ((void) atomic_dec_return((v)))
91a47a12beSStefan Roese #define atomic_dec_and_test(v) (atomic_dec_return((v)) == 0)
92a47a12beSStefan Roese
93a47a12beSStefan Roese #endif /* _ASM_PPC_ATOMIC_H_ */
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