projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | #ifndef __ARCH_H8300_ATOMIC__ |
| 2 | #define __ARCH_H8300_ATOMIC__ | |
| 3 | ||
| 4 | /* | |
| 5 | * Atomic operations that C can't guarantee us. Useful for | |
| 6 | * resource counting etc.. | |
| 7 | */ | |
| 8 | ||
| 9 | typedef struct { int counter; } atomic_t; | |
| 10 | #define ATOMIC_INIT(i) { (i) } | |
| 11 | ||
| 12 | #define atomic_read(v) ((v)->counter) | |
| 13 | #define atomic_set(v, i) (((v)->counter) = i) | |
| 14 | ||
| 15 | #include <asm/system.h> | |
| 16 | #include <linux/kernel.h> | |
| 17 | ||
| 18 | static __inline__ int atomic_add_return(int i, atomic_t *v) | |
| 19 | { | |
| 20 | int ret,flags; | |
| 21 | local_irq_save(flags); | |
| 22 | ret = v->counter += i; | |
| 23 | local_irq_restore(flags); | |
| 24 | return ret; | |
| 25 | } | |
| 26 | ||
| 27 | #define atomic_add(i, v) atomic_add_return(i, v) | |
| 28 | #define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0) | |
| 29 | ||
| 30 | static __inline__ int atomic_sub_return(int i, atomic_t *v) | |
| 31 | { | |
| 32 | int ret,flags; | |
| 33 | local_irq_save(flags); | |
| 34 | ret = v->counter -= i; | |
| 35 | local_irq_restore(flags); | |
| 36 | return ret; | |
| 37 | } | |
| 38 | ||
| 39 | #define atomic_sub(i, v) atomic_sub_return(i, v) | |
| 40 | ||
| 41 | static __inline__ int atomic_inc_return(atomic_t *v) | |
| 42 | { | |
| 43 | int ret,flags; | |
| 44 | local_irq_save(flags); | |
| 45 | v->counter++; | |
| 46 | ret = v->counter; | |
| 47 | local_irq_restore(flags); | |
| 48 | return ret; | |
| 49 | } | |
| 50 | ||
| 51 | #define atomic_inc(v) atomic_inc_return(v) | |
| 52 | ||
| 53 | /* | |
| 54 | * atomic_inc_and_test - increment and test | |
| 55 | * @v: pointer of type atomic_t | |
| 56 | * | |
| 57 | * Atomically increments @v by 1 | |
| 58 | * and returns true if the result is zero, or false for all | |
| 59 | * other cases. | |
| 60 | */ | |
| 61 | #define atomic_inc_and_test(v) (atomic_inc_return(v) == 0) | |
| 62 | ||
| 63 | static __inline__ int atomic_dec_return(atomic_t *v) | |
| 64 | { | |
| 65 | int ret,flags; | |
| 66 | local_irq_save(flags); | |
| 67 | --v->counter; | |
| 68 | ret = v->counter; | |
| 69 | local_irq_restore(flags); | |
| 70 | return ret; | |
| 71 | } | |
| 72 | ||
| 73 | #define atomic_dec(v) atomic_dec_return(v) | |
| 74 | ||
| 75 | static __inline__ int atomic_dec_and_test(atomic_t *v) | |
| 76 | { | |
| 77 | int ret,flags; | |
| 78 | local_irq_save(flags); | |
| 79 | --v->counter; | |
| 80 | ret = v->counter; | |
| 81 | local_irq_restore(flags); | |
| 82 | return ret == 0; | |
| 83 | } | |
| 84 | ||
| 4a6dae6d NP |
85 | static inline int atomic_cmpxchg(atomic_t *v, int old, int new) |
| 86 | { | |
| 87 | int ret; | |
| 88 | unsigned long flags; | |
| 89 | ||
| 90 | local_irq_save(flags); | |
| 91 | ret = v->counter; | |
| 92 | if (likely(ret == old)) | |
| 93 | v->counter = new; | |
| 94 | local_irq_restore(flags); | |
| 95 | return ret; | |
| 96 | } | |
| 97 | ||
| 1da177e4 LT |
98 | static __inline__ void atomic_clear_mask(unsigned long mask, unsigned long *v) |
| 99 | { | |
| 100 | __asm__ __volatile__("stc ccr,r1l\n\t" | |
| 101 | "orc #0x80,ccr\n\t" | |
| 102 | "mov.l %0,er0\n\t" | |
| 103 | "and.l %1,er0\n\t" | |
| 104 | "mov.l er0,%0\n\t" | |
| 105 | "ldc r1l,ccr" | |
| 106 | : "=m" (*v) : "g" (~(mask)) :"er0","er1"); | |
| 107 | } | |
| 108 | ||
| 109 | static __inline__ void atomic_set_mask(unsigned long mask, unsigned long *v) | |
| 110 | { | |
| 111 | __asm__ __volatile__("stc ccr,r1l\n\t" | |
| 112 | "orc #0x80,ccr\n\t" | |
| 113 | "mov.l %0,er0\n\t" | |
| 114 | "or.l %1,er0\n\t" | |
| 115 | "mov.l er0,%0\n\t" | |
| 116 | "ldc r1l,ccr" | |
| 117 | : "=m" (*v) : "g" (mask) :"er0","er1"); | |
| 118 | } | |
| 119 | ||
| 120 | /* Atomic operations are already serializing */ | |
| 121 | #define smp_mb__before_atomic_dec() barrier() | |
| 122 | #define smp_mb__after_atomic_dec() barrier() | |
| 123 | #define smp_mb__before_atomic_inc() barrier() | |
| 124 | #define smp_mb__after_atomic_inc() barrier() | |
| 125 | ||
| 126 | #endif /* __ARCH_H8300_ATOMIC __ */ |