include/asm-h8300/atomic.h

   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
  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
  98 #define atomic_xchg(v, new) (xchg(&((v)->counter), new))
  99
 100 static inline int atomic_add_unless(atomic_t *v, int a, int u)
 101 {
 102         int ret;
 103         unsigned long flags;
 104
 105         local_irq_save(flags);
 106         ret = v->counter;
 107         if (ret != u)
 108                 v->counter += a;
 109         local_irq_restore(flags);
 110         return ret != u;
 111 }
 112 #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
 113
 114 static __inline__ void atomic_clear_mask(unsigned long mask, unsigned long *v)
 115 {
 116         __asm__ __volatile__("stc ccr,r1l\n\t"
 117                              "orc #0x80,ccr\n\t"
 118                              "mov.l %0,er0\n\t"
 119                              "and.l %1,er0\n\t"
 120                              "mov.l er0,%0\n\t"
 121                              "ldc r1l,ccr"
 122                              : "=m" (*v) : "g" (~(mask)) :"er0","er1");
 123 }
 124
 125 static __inline__ void atomic_set_mask(unsigned long mask, unsigned long *v)
 126 {
 127         __asm__ __volatile__("stc ccr,r1l\n\t"
 128                              "orc #0x80,ccr\n\t"
 129                              "mov.l %0,er0\n\t"
 130                              "or.l %1,er0\n\t"
 131                              "mov.l er0,%0\n\t"
 132                              "ldc r1l,ccr"
 133                              : "=m" (*v) : "g" (mask) :"er0","er1");
 134 }
 135
 136 /* Atomic operations are already serializing */
 137 #define smp_mb__before_atomic_dec()    barrier()
 138 #define smp_mb__after_atomic_dec() barrier()
 139 #define smp_mb__before_atomic_inc()    barrier()
 140 #define smp_mb__after_atomic_inc() barrier()
 141
 142 #include <asm-generic/atomic.h>
 143 #endif /* __ARCH_H8300_ATOMIC __ */