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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 | #ifndef __ARCH_H8300_ATOMIC__ #define __ARCH_H8300_ATOMIC__ /* * Atomic operations that C can't guarantee us. Useful for * resource counting etc.. */ typedef struct { int counter; } atomic_t; #define ATOMIC_INIT(i) { (i) } #define atomic_read(v) ((v)->counter) #define atomic_set(v, i) (((v)->counter) = i) #include <asm/system.h> #include <linux/kernel.h> static __inline__ int atomic_add_return(int i, atomic_t *v) { int ret,flags; local_irq_save(flags); ret = v->counter += i; local_irq_restore(flags); return ret; } #define atomic_add(i, v) atomic_add_return(i, v) #define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0) static __inline__ int atomic_sub_return(int i, atomic_t *v) { int ret,flags; local_irq_save(flags); ret = v->counter -= i; local_irq_restore(flags); return ret; } #define atomic_sub(i, v) atomic_sub_return(i, v) static __inline__ int atomic_inc_return(atomic_t *v) { int ret,flags; local_irq_save(flags); v->counter++; ret = v->counter; local_irq_restore(flags); return ret; } #define atomic_inc(v) atomic_inc_return(v) /* * atomic_inc_and_test - increment and test * @v: pointer of type atomic_t * * Atomically increments @v by 1 * and returns true if the result is zero, or false for all * other cases. */ #define atomic_inc_and_test(v) (atomic_inc_return(v) == 0) static __inline__ int atomic_dec_return(atomic_t *v) { int ret,flags; local_irq_save(flags); --v->counter; ret = v->counter; local_irq_restore(flags); return ret; } #define atomic_dec(v) atomic_dec_return(v) static __inline__ int atomic_dec_and_test(atomic_t *v) { int ret,flags; local_irq_save(flags); --v->counter; ret = v->counter; local_irq_restore(flags); return ret == 0; } static inline int atomic_cmpxchg(atomic_t *v, int old, int new) { int ret; unsigned long flags; local_irq_save(flags); ret = v->counter; if (likely(ret == old)) v->counter = new; local_irq_restore(flags); return ret; } #define atomic_xchg(v, new) (xchg(&((v)->counter), new)) static inline int atomic_add_unless(atomic_t *v, int a, int u) { int ret; unsigned long flags; local_irq_save(flags); ret = v->counter; if (ret != u) v->counter += a; local_irq_restore(flags); return ret != u; } #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0) static __inline__ void atomic_clear_mask(unsigned long mask, unsigned long *v) { __asm__ __volatile__("stc ccr,r1l\n\t" "orc #0x80,ccr\n\t" "mov.l %0,er0\n\t" "and.l %1,er0\n\t" "mov.l er0,%0\n\t" "ldc r1l,ccr" : "=m" (*v) : "g" (~(mask)) :"er0","er1"); } static __inline__ void atomic_set_mask(unsigned long mask, unsigned long *v) { __asm__ __volatile__("stc ccr,r1l\n\t" "orc #0x80,ccr\n\t" "mov.l %0,er0\n\t" "or.l %1,er0\n\t" "mov.l er0,%0\n\t" "ldc r1l,ccr" : "=m" (*v) : "g" (mask) :"er0","er1"); } /* Atomic operations are already serializing */ #define smp_mb__before_atomic_dec() barrier() #define smp_mb__after_atomic_dec() barrier() #define smp_mb__before_atomic_inc() barrier() #define smp_mb__after_atomic_inc() barrier() #include <asm-generic/atomic.h> #endif /* __ARCH_H8300_ATOMIC __ */ |