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atomic.h

#ifndef _ASM_IA64_ATOMIC_H
#define _ASM_IA64_ATOMIC_H

/*
 * Atomic operations that C can't guarantee us.  Useful for
 * resource counting etc..
 *
 * NOTE: don't mess with the types below!  The "unsigned long" and
 * "int" types were carefully placed so as to ensure proper operation
 * of the macros.
 *
 * Copyright (C) 1998, 1999, 2002-2003 Hewlett-Packard Co
 *    David Mosberger-Tang <davidm@hpl.hp.com>
 */
#include <linux/types.h>

#include <asm/intrinsics.h>
#include <asm/system.h>


#define ATOMIC_INIT(i)        ((atomic_t) { (i) })
#define ATOMIC64_INIT(i)      ((atomic64_t) { (i) })

#define atomic_read(v)        ((v)->counter)
#define atomic64_read(v)      ((v)->counter)

#define atomic_set(v,i)       (((v)->counter) = (i))
#define atomic64_set(v,i)     (((v)->counter) = (i))

static __inline__ int
ia64_atomic_add (int i, atomic_t *v)
{
      __s32 old, new;
      CMPXCHG_BUGCHECK_DECL

      do {
            CMPXCHG_BUGCHECK(v);
            old = atomic_read(v);
            new = old + i;
      } while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic_t)) != old);
      return new;
}

static __inline__ int
ia64_atomic64_add (__s64 i, atomic64_t *v)
{
      __s64 old, new;
      CMPXCHG_BUGCHECK_DECL

      do {
            CMPXCHG_BUGCHECK(v);
            old = atomic64_read(v);
            new = old + i;
      } while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic64_t)) != old);
      return new;
}

static __inline__ int
ia64_atomic_sub (int i, atomic_t *v)
{
      __s32 old, new;
      CMPXCHG_BUGCHECK_DECL

      do {
            CMPXCHG_BUGCHECK(v);
            old = atomic_read(v);
            new = old - i;
      } while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic_t)) != old);
      return new;
}

static __inline__ int
ia64_atomic64_sub (__s64 i, atomic64_t *v)
{
      __s64 old, new;
      CMPXCHG_BUGCHECK_DECL

      do {
            CMPXCHG_BUGCHECK(v);
            old = atomic64_read(v);
            new = old - i;
      } while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic64_t)) != old);
      return new;
}

#define atomic_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), old, new))
#define atomic_xchg(v, new) (xchg(&((v)->counter), new))

#define atomic64_cmpxchg(v, old, new) \
      (cmpxchg(&((v)->counter), old, new))
#define atomic64_xchg(v, new) (xchg(&((v)->counter), new))

static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
{
      int c, old;
      c = atomic_read(v);
      for (;;) {
            if (unlikely(c == (u)))
                  break;
            old = atomic_cmpxchg((v), c, c + (a));
            if (likely(old == c))
                  break;
            c = old;
      }
      return c != (u);
}

#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)

static __inline__ int atomic64_add_unless(atomic64_t *v, long a, long u)
{
      long c, old;
      c = atomic64_read(v);
      for (;;) {
            if (unlikely(c == (u)))
                  break;
            old = atomic64_cmpxchg((v), c, c + (a));
            if (likely(old == c))
                  break;
            c = old;
      }
      return c != (u);
}

#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0)

#define atomic_add_return(i,v)                                    \
({                                                    \
      int __ia64_aar_i = (i);                               \
      (__builtin_constant_p(i)                              \
       && (   (__ia64_aar_i ==  1) || (__ia64_aar_i ==   4)       \
           || (__ia64_aar_i ==  8) || (__ia64_aar_i ==  16)       \
           || (__ia64_aar_i == -1) || (__ia64_aar_i ==  -4)       \
           || (__ia64_aar_i == -8) || (__ia64_aar_i == -16)))           \
            ? ia64_fetch_and_add(__ia64_aar_i, &(v)->counter)     \
            : ia64_atomic_add(__ia64_aar_i, v);             \
})

#define atomic64_add_return(i,v)                            \
({                                                    \
      long __ia64_aar_i = (i);                              \
      (__builtin_constant_p(i)                              \
       && (   (__ia64_aar_i ==  1) || (__ia64_aar_i ==   4)       \
           || (__ia64_aar_i ==  8) || (__ia64_aar_i ==  16)       \
           || (__ia64_aar_i == -1) || (__ia64_aar_i ==  -4)       \
           || (__ia64_aar_i == -8) || (__ia64_aar_i == -16)))           \
            ? ia64_fetch_and_add(__ia64_aar_i, &(v)->counter)     \
            : ia64_atomic64_add(__ia64_aar_i, v);                 \
})

/*
 * Atomically add I to V and return TRUE if the resulting value is
 * negative.
 */
static __inline__ int
atomic_add_negative (int i, atomic_t *v)
{
      return atomic_add_return(i, v) < 0;
}

static __inline__ int
atomic64_add_negative (__s64 i, atomic64_t *v)
{
      return atomic64_add_return(i, v) < 0;
}

#define atomic_sub_return(i,v)                                    \
({                                                    \
      int __ia64_asr_i = (i);                               \
      (__builtin_constant_p(i)                              \
       && (   (__ia64_asr_i ==   1) || (__ia64_asr_i ==   4)            \
           || (__ia64_asr_i ==   8) || (__ia64_asr_i ==  16)            \
           || (__ia64_asr_i ==  -1) || (__ia64_asr_i ==  -4)            \
           || (__ia64_asr_i ==  -8) || (__ia64_asr_i == -16)))    \
            ? ia64_fetch_and_add(-__ia64_asr_i, &(v)->counter)    \
            : ia64_atomic_sub(__ia64_asr_i, v);             \
})

#define atomic64_sub_return(i,v)                            \
({                                                    \
      long __ia64_asr_i = (i);                              \
      (__builtin_constant_p(i)                              \
       && (   (__ia64_asr_i ==   1) || (__ia64_asr_i ==   4)            \
           || (__ia64_asr_i ==   8) || (__ia64_asr_i ==  16)            \
           || (__ia64_asr_i ==  -1) || (__ia64_asr_i ==  -4)            \
           || (__ia64_asr_i ==  -8) || (__ia64_asr_i == -16)))    \
            ? ia64_fetch_and_add(-__ia64_asr_i, &(v)->counter)    \
            : ia64_atomic64_sub(__ia64_asr_i, v);                 \
})

#define atomic_dec_return(v)        atomic_sub_return(1, (v))
#define atomic_inc_return(v)        atomic_add_return(1, (v))
#define atomic64_dec_return(v)            atomic64_sub_return(1, (v))
#define atomic64_inc_return(v)            atomic64_add_return(1, (v))

#define atomic_sub_and_test(i,v)    (atomic_sub_return((i), (v)) == 0)
#define atomic_dec_and_test(v)            (atomic_sub_return(1, (v)) == 0)
#define atomic_inc_and_test(v)            (atomic_add_return(1, (v)) == 0)
#define atomic64_sub_and_test(i,v)  (atomic64_sub_return((i), (v)) == 0)
#define atomic64_dec_and_test(v)    (atomic64_sub_return(1, (v)) == 0)
#define atomic64_inc_and_test(v)    (atomic64_add_return(1, (v)) == 0)

#define atomic_add(i,v)             atomic_add_return((i), (v))
#define atomic_sub(i,v)             atomic_sub_return((i), (v))
#define atomic_inc(v)               atomic_add(1, (v))
#define atomic_dec(v)               atomic_sub(1, (v))

#define atomic64_add(i,v)           atomic64_add_return((i), (v))
#define atomic64_sub(i,v)           atomic64_sub_return((i), (v))
#define atomic64_inc(v)             atomic64_add(1, (v))
#define atomic64_dec(v)             atomic64_sub(1, (v))

/* 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-long.h>
#endif /* _ASM_IA64_ATOMIC_H */

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