arch/h8300/include/asm/atomic.h

   1 #ifndef __ARCH_H8300_ATOMIC__
   2 #define __ARCH_H8300_ATOMIC__
   3
   4 #include <linux/types.h>
   5
   6 /*
   7  * Atomic operations that C can't guarantee us.  Useful for
   8  * resource counting etc..
   9  */
  10
  11 #define ATOMIC_INIT(i)  { (i) }
  12
  13 #define atomic_read(v)          (*(volatile int *)&(v)->counter)
  14 #define atomic_set(v, i)        (((v)->counter) = i)
  15
  16 #include <asm/system.h>
  17 #include <linux/kernel.h>
  18
  19 static __inline__ int atomic_add_return(int i, atomic_t *v)
  20 {
  21         unsigned long flags;
  22         int ret;
  23         local_irq_save(flags);
  24         ret = v->counter += i;
  25         local_irq_restore(flags);
  26         return ret;
  27 }
  28
  29 #define atomic_add(i, v) atomic_add_return(i, v)
  30 #define atomic_add_negative(a, v)       (atomic_add_return((a), (v)) < 0)
  31
  32 static __inline__ int atomic_sub_return(int i, atomic_t *v)
  33 {
  34         unsigned long flags;
  35         int ret;
  36         local_irq_save(flags);
  37         ret = v->counter -= i;
  38         local_irq_restore(flags);
  39         return ret;
  40 }
  41
  42 #define atomic_sub(i, v) atomic_sub_return(i, v)
  43 #define atomic_sub_and_test(i,v) (atomic_sub_return(i, v) == 0)
  44
  45 static __inline__ int atomic_inc_return(atomic_t *v)
  46 {
  47         unsigned long flags;
  48         int ret;
  49         local_irq_save(flags);
  50         v->counter++;
  51         ret = v->counter;
  52         local_irq_restore(flags);
  53         return ret;
  54 }
  55
  56 #define atomic_inc(v) atomic_inc_return(v)
  57
  58 /*
  59  * atomic_inc_and_test - increment and test
  60  * @v: pointer of type atomic_t
  61  *
  62  * Atomically increments @v by 1
  63  * and returns true if the result is zero, or false for all
  64  * other cases.
  65  */
  66 #define atomic_inc_and_test(v) (atomic_inc_return(v) == 0)
  67
  68 static __inline__ int atomic_dec_return(atomic_t *v)
  69 {
  70         unsigned long flags;
  71         int ret;
  72         local_irq_save(flags);
  73         --v->counter;
  74         ret = v->counter;
  75         local_irq_restore(flags);
  76         return ret;
  77 }
  78
  79 #define atomic_dec(v) atomic_dec_return(v)
  80
  81 static __inline__ int atomic_dec_and_test(atomic_t *v)
  82 {
  83         unsigned long flags;
  84         int ret;
  85         local_irq_save(flags);
  86         --v->counter;
  87         ret = v->counter;
  88         local_irq_restore(flags);
  89         return ret == 0;
  90 }
  91
  92 static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
  93 {
  94         int ret;
  95         unsigned long flags;
  96
  97         local_irq_save(flags);
  98         ret = v->counter;
  99         if (likely(ret == old))
 100                 v->counter = new;
 101         local_irq_restore(flags);
 102         return ret;
 103 }
 104
 105 #define atomic_xchg(v, new) (xchg(&((v)->counter), new))
 106
 107 static inline int __atomic_add_unless(atomic_t *v, int a, int u)
 108 {
 109         int ret;
 110         unsigned long flags;
 111
 112         local_irq_save(flags);
 113         ret = v->counter;
 114         if (ret != u)
 115                 v->counter += a;
 116         local_irq_restore(flags);
 117         return ret;
 118 }
 119
 120 static __inline__ void atomic_clear_mask(unsigned long mask, unsigned long *v)
 121 {
 122         __asm__ __volatile__("stc ccr,r1l\n\t"
 123                              "orc #0x80,ccr\n\t"
 124                              "mov.l %0,er0\n\t"
 125                              "and.l %1,er0\n\t"
 126                              "mov.l er0,%0\n\t"
 127                              "ldc r1l,ccr"
 128                              : "=m" (*v) : "g" (~(mask)) :"er0","er1");
 129 }
 130
 131 static __inline__ void atomic_set_mask(unsigned long mask, unsigned long *v)
 132 {
 133         __asm__ __volatile__("stc ccr,r1l\n\t"
 134                              "orc #0x80,ccr\n\t"
 135                              "mov.l %0,er0\n\t"
 136                              "or.l %1,er0\n\t"
 137                              "mov.l er0,%0\n\t"
 138                              "ldc r1l,ccr"
 139                              : "=m" (*v) : "g" (mask) :"er0","er1");
 140 }
 141
 142 /* Atomic operations are already serializing */
 143 #define smp_mb__before_atomic_dec()    barrier()
 144 #define smp_mb__after_atomic_dec() barrier()
 145 #define smp_mb__before_atomic_inc()    barrier()
 146 #define smp_mb__after_atomic_inc() barrier()
 147
 148 #endif /* __ARCH_H8300_ATOMIC __ */