LXR linux/arch/h8300/include/asm/atomic.h

   1#ifndef __ARCH_H8300_ATOMIC__
   2#define __ARCH_H8300_ATOMIC__
   3
   4#include <linux/types.h>
   5#include <asm/cmpxchg.h>
   6
   7/*
   8 * Atomic operations that C can't guarantee us.  Useful for
   9 * resource counting etc..
  10 */
  11
  12#define ATOMIC_INIT(i)  { (i) }
  13
  14#define atomic_read(v)          ACCESS_ONCE((v)->counter)
  15#define atomic_set(v, i)        (((v)->counter) = i)
  16
  17#include <linux/kernel.h>
  18
  19#define ATOMIC_OP_RETURN(op, c_op)                              \
  20static inline int atomic_##op##_return(int i, atomic_t *v)      \
  21{                                                               \
  22        h8300flags flags;                                       \
  23        int ret;                                                \
  24                                                                \
  25        flags = arch_local_irq_save();                          \
  26        ret = v->counter c_op i;                                \
  27        arch_local_irq_restore(flags);                          \
  28        return ret;                                             \
  29}
  30
  31#define ATOMIC_OP(op, c_op)                                     \
  32static inline void atomic_##op(int i, atomic_t *v)              \
  33{                                                               \
  34        h8300flags flags;                                       \
  35                                                                \
  36        flags = arch_local_irq_save();                          \
  37        v->counter c_op i;                                      \
  38        arch_local_irq_restore(flags);                          \
  39}
  40
  41ATOMIC_OP_RETURN(add, +=)
  42ATOMIC_OP_RETURN(sub, -=)
  43
  44ATOMIC_OP(and, &=)
  45ATOMIC_OP(or,  |=)
  46ATOMIC_OP(xor, ^=)
  47
  48#undef ATOMIC_OP_RETURN
  49#undef ATOMIC_OP
  50
  51#define atomic_add(i, v)                (void)atomic_add_return(i, v)
  52#define atomic_add_negative(a, v)       (atomic_add_return((a), (v)) < 0)
  53
  54#define atomic_sub(i, v)                (void)atomic_sub_return(i, v)
  55#define atomic_sub_and_test(i, v)       (atomic_sub_return(i, v) == 0)
  56
  57#define atomic_inc_return(v)            atomic_add_return(1, v)
  58#define atomic_dec_return(v)            atomic_sub_return(1, v)
  59
  60#define atomic_inc(v)                   (void)atomic_inc_return(v)
  61#define atomic_inc_and_test(v)          (atomic_inc_return(v) == 0)
  62
  63#define atomic_dec(v)                   (void)atomic_dec_return(v)
  64#define atomic_dec_and_test(v)          (atomic_dec_return(v) == 0)
  65
  66static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
  67{
  68        int ret;
  69        h8300flags flags;
  70
  71        flags = arch_local_irq_save();
  72        ret = v->counter;
  73        if (likely(ret == old))
  74                v->counter = new;
  75        arch_local_irq_restore(flags);
  76        return ret;
  77}
  78
  79static inline int __atomic_add_unless(atomic_t *v, int a, int u)
  80{
  81        int ret;
  82        h8300flags flags;
  83
  84        flags = arch_local_irq_save();
  85        ret = v->counter;
  86        if (ret != u)
  87                v->counter += a;
  88        arch_local_irq_restore(flags);
  89        return ret;
  90}
  91
  92#endif /* __ARCH_H8300_ATOMIC __ */
  93