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)          ((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         int ret,flags;
  22         local_irq_save(flags);
  23         ret = v->counter += i;
  24         local_irq_restore(flags);
  25         return ret;
  26 }
  27
  28 #define atomic_add(i, v) atomic_add_return(i, v)
  29 #define atomic_add_negative(a, v)       (atomic_add_return((a), (v)) < 0)
  30
  31 static __inline__ int atomic_sub_return(int i, atomic_t *v)
  32 {
  33         int ret,flags;
  34         local_irq_save(flags);
  35         ret = v->counter -= i;
  36         local_irq_restore(flags);
  37         return ret;
  38 }
  39
  40 #define atomic_sub(i, v) atomic_sub_return(i, v)
  41 #define atomic_sub_and_test(i,v) (atomic_sub_return(i, v) == 0)
  42
  43 static __inline__ int atomic_inc_return(atomic_t *v)
  44 {
  45         int ret,flags;
  46         local_irq_save(flags);
  47         v->counter++;
  48         ret = v->counter;
  49         local_irq_restore(flags);
  50         return ret;
  51 }
  52
  53 #define atomic_inc(v) atomic_inc_return(v)
  54
  55 /*
  56  * atomic_inc_and_test - increment and test
  57  * @v: pointer of type atomic_t
  58  *
  59  * Atomically increments @v by 1
  60  * and returns true if the result is zero, or false for all
  61  * other cases.
  62  */
  63 #define atomic_inc_and_test(v) (atomic_inc_return(v) == 0)
  64
  65 static __inline__ int atomic_dec_return(atomic_t *v)
  66 {
  67         int ret,flags;
  68         local_irq_save(flags);
  69         --v->counter;
  70         ret = v->counter;
  71         local_irq_restore(flags);
  72         return ret;
  73 }
  74
  75 #define atomic_dec(v) atomic_dec_return(v)
  76
  77 static __inline__ int atomic_dec_and_test(atomic_t *v)
  78 {
  79         int ret,flags;
  80         local_irq_save(flags);
  81         --v->counter;
  82         ret = v->counter;
  83         local_irq_restore(flags);
  84         return ret == 0;
  85 }
  86
  87 static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
  88 {
  89         int ret;
  90         unsigned long flags;
  91
  92         local_irq_save(flags);
  93         ret = v->counter;
  94         if (likely(ret == old))
  95                 v->counter = new;
  96         local_irq_restore(flags);
  97         return ret;
  98 }
  99
 100 #define atomic_xchg(v, new) (xchg(&((v)->counter), new))
 101
 102 static inline int atomic_add_unless(atomic_t *v, int a, int u)
 103 {
 104         int ret;
 105         unsigned long flags;
 106
 107         local_irq_save(flags);
 108         ret = v->counter;
 109         if (ret != u)
 110                 v->counter += a;
 111         local_irq_restore(flags);
 112         return ret != u;
 113 }
 114 #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
 115
 116 static __inline__ void atomic_clear_mask(unsigned long mask, unsigned long *v)
 117 {
 118         __asm__ __volatile__("stc ccr,r1l\n\t"
 119                              "orc #0x80,ccr\n\t"
 120                              "mov.l %0,er0\n\t"
 121                              "and.l %1,er0\n\t"
 122                              "mov.l er0,%0\n\t"
 123                              "ldc r1l,ccr"
 124                              : "=m" (*v) : "g" (~(mask)) :"er0","er1");
 125 }
 126
 127 static __inline__ void atomic_set_mask(unsigned long mask, unsigned long *v)
 128 {
 129         __asm__ __volatile__("stc ccr,r1l\n\t"
 130                              "orc #0x80,ccr\n\t"
 131                              "mov.l %0,er0\n\t"
 132                              "or.l %1,er0\n\t"
 133                              "mov.l er0,%0\n\t"
 134                              "ldc r1l,ccr"
 135                              : "=m" (*v) : "g" (mask) :"er0","er1");
 136 }
 137
 138 /* Atomic operations are already serializing */
 139 #define smp_mb__before_atomic_dec()    barrier()
 140 #define smp_mb__after_atomic_dec() barrier()
 141 #define smp_mb__before_atomic_inc()    barrier()
 142 #define smp_mb__after_atomic_inc() barrier()
 143
 144 #include <asm-generic/atomic.h>
 145 #endif /* __ARCH_H8300_ATOMIC __ */