projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | #ifndef __ASM_SH_ATOMIC_H |
| 2 | #define __ASM_SH_ATOMIC_H | |
| 3 | ||
| 4 | /* | |
| 5 | * Atomic operations that C can't guarantee us. Useful for | |
| 6 | * resource counting etc.. | |
| 7 | * | |
| 8 | */ | |
| 9 | ||
| 10 | typedef struct { volatile int counter; } atomic_t; | |
| 11 | ||
| 12 | #define ATOMIC_INIT(i) ( (atomic_t) { (i) } ) | |
| 13 | ||
| 14 | #define atomic_read(v) ((v)->counter) | |
| 15 | #define atomic_set(v,i) ((v)->counter = (i)) | |
| 16 | ||
| e4c2cfee | 17 | #include <linux/compiler.h> |
| 1da177e4 LT |
18 | #include <asm/system.h> |
| 19 | ||
| 781125ca | 20 | #ifdef CONFIG_CPU_SH4A |
| ec723fbe | 21 | #include <asm/atomic-llsc.h> |
| 781125ca | 22 | #else |
| ec723fbe | 23 | #include <asm/atomic-irq.h> |
| 781125ca | 24 | #endif |
| 1da177e4 LT |
25 | |
| 26 | #define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0) | |
| 27 | ||
| 1da177e4 LT |
28 | #define atomic_dec_return(v) atomic_sub_return(1,(v)) |
| 29 | #define atomic_inc_return(v) atomic_add_return(1,(v)) | |
| 30 | ||
| 31 | /* | |
| 32 | * atomic_inc_and_test - increment and test | |
| 33 | * @v: pointer of type atomic_t | |
| 34 | * | |
| 35 | * Atomically increments @v by 1 | |
| 36 | * and returns true if the result is zero, or false for all | |
| 37 | * other cases. | |
| 38 | */ | |
| 39 | #define atomic_inc_and_test(v) (atomic_inc_return(v) == 0) | |
| 40 | ||
| 41 | #define atomic_sub_and_test(i,v) (atomic_sub_return((i), (v)) == 0) | |
| 42 | #define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0) | |
| 43 | ||
| 44 | #define atomic_inc(v) atomic_add(1,(v)) | |
| 45 | #define atomic_dec(v) atomic_sub(1,(v)) | |
| 46 | ||
| 4a6dae6d NP |
47 | static inline int atomic_cmpxchg(atomic_t *v, int old, int new) |
| 48 | { | |
| 49 | int ret; | |
| 50 | unsigned long flags; | |
| 51 | ||
| 52 | local_irq_save(flags); | |
| 53 | ret = v->counter; | |
| 54 | if (likely(ret == old)) | |
| 55 | v->counter = new; | |
| 56 | local_irq_restore(flags); | |
| 57 | ||
| 58 | return ret; | |
| 59 | } | |
| 60 | ||
| ffbf670f IM |
61 | #define atomic_xchg(v, new) (xchg(&((v)->counter), new)) |
| 62 | ||
| 8426e1f6 NP |
63 | static inline int atomic_add_unless(atomic_t *v, int a, int u) |
| 64 | { | |
| 65 | int ret; | |
| 66 | unsigned long flags; | |
| 67 | ||
| 68 | local_irq_save(flags); | |
| 69 | ret = v->counter; | |
| 70 | if (ret != u) | |
| 71 | v->counter += a; | |
| 72 | local_irq_restore(flags); | |
| 73 | ||
| 74 | return ret != u; | |
| 75 | } | |
| 76 | #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0) | |
| 77 | ||
| 1da177e4 LT |
78 | /* Atomic operations are already serializing on SH */ |
| 79 | #define smp_mb__before_atomic_dec() barrier() | |
| 80 | #define smp_mb__after_atomic_dec() barrier() | |
| 81 | #define smp_mb__before_atomic_inc() barrier() | |
| 82 | #define smp_mb__after_atomic_inc() barrier() | |
| 83 | ||
| d3cb4871 | 84 | #include <asm-generic/atomic.h> |
| 1da177e4 | 85 | #endif /* __ASM_SH_ATOMIC_H */ |