FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/include/os/freebsd/spl/sys/atomic.h

     /*
      * Copyright (c) 2007 Pawel Jakub Dawidek <pjd@FreeBSD.org>
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * $FreeBSD$
     */
    
    #ifndef _OPENSOLARIS_SYS_ATOMIC_H_
    #define _OPENSOLARIS_SYS_ATOMIC_H_
    
    #ifndef _STANDALONE
    
    #include <sys/types.h>
    #include <machine/atomic.h>
    
    #define atomic_sub_64   atomic_subtract_64
    
    #if defined(__i386__) && (defined(_KERNEL) || defined(KLD_MODULE))
    #define I386_HAVE_ATOMIC64
    #endif
    
    #if defined(__i386__) || defined(__amd64__) || defined(__arm__)
    /* No spurious failures from fcmpset. */
    #define STRONG_FCMPSET
    #endif
    
    #if !defined(__LP64__) && !defined(__mips_n32) && \
            !defined(ARM_HAVE_ATOMIC64) && !defined(I386_HAVE_ATOMIC64) && \
            !defined(HAS_EMULATED_ATOMIC64)
    extern void atomic_add_64(volatile uint64_t *target, int64_t delta);
    extern void atomic_dec_64(volatile uint64_t *target);
    extern uint64_t atomic_swap_64(volatile uint64_t *a, uint64_t value);
    extern uint64_t atomic_load_64(volatile uint64_t *a);
    extern uint64_t atomic_add_64_nv(volatile uint64_t *target, int64_t delta);
    extern uint64_t atomic_cas_64(volatile uint64_t *target, uint64_t cmp,
        uint64_t newval);
    #endif
    
    #define membar_consumer()               atomic_thread_fence_acq()
    #define membar_producer()               atomic_thread_fence_rel()
    #define membar_sync()                   atomic_thread_fence_seq_cst()
    
    static __inline uint32_t
    atomic_add_32_nv(volatile uint32_t *target, int32_t delta)
    {
            return (atomic_fetchadd_32(target, delta) + delta);
    }
    
    static __inline uint_t
    atomic_add_int_nv(volatile uint_t *target, int delta)
    {
            return (atomic_add_32_nv(target, delta));
    }
    
    static __inline void
    atomic_inc_32(volatile uint32_t *target)
    {
            atomic_add_32(target, 1);
    }
    
    static __inline uint32_t
    atomic_inc_32_nv(volatile uint32_t *target)
    {
            return (atomic_add_32_nv(target, 1));
    }
    
    static __inline void
    atomic_dec_32(volatile uint32_t *target)
    {
            atomic_subtract_32(target, 1);
    }
    
    static __inline uint32_t
    atomic_dec_32_nv(volatile uint32_t *target)
    {
            return (atomic_add_32_nv(target, -1));
    }
    
   #ifndef __sparc64__
   static inline uint32_t
   atomic_cas_32(volatile uint32_t *target, uint32_t cmp, uint32_t newval)
   {
   #ifdef STRONG_FCMPSET
           (void) atomic_fcmpset_32(target, &cmp, newval);
   #else
           uint32_t expected = cmp;
   
           do {
                   if (atomic_fcmpset_32(target, &cmp, newval))
                           break;
           } while (cmp == expected);
   #endif
           return (cmp);
   }
   #endif
   
   #if defined(__LP64__) || defined(__mips_n32) || \
           defined(ARM_HAVE_ATOMIC64) || defined(I386_HAVE_ATOMIC64) || \
           defined(HAS_EMULATED_ATOMIC64)
   static __inline void
   atomic_dec_64(volatile uint64_t *target)
   {
           atomic_subtract_64(target, 1);
   }
   
   static inline uint64_t
   atomic_add_64_nv(volatile uint64_t *target, int64_t delta)
   {
           return (atomic_fetchadd_64(target, delta) + delta);
   }
   
   #ifndef __sparc64__
   static inline uint64_t
   atomic_cas_64(volatile uint64_t *target, uint64_t cmp, uint64_t newval)
   {
   #ifdef STRONG_FCMPSET
           (void) atomic_fcmpset_64(target, &cmp, newval);
   #else
           uint64_t expected = cmp;
   
           do {
                   if (atomic_fcmpset_64(target, &cmp, newval))
                           break;
           } while (cmp == expected);
   #endif
           return (cmp);
   }
   #endif
   #endif
   
   static __inline void
   atomic_inc_64(volatile uint64_t *target)
   {
           atomic_add_64(target, 1);
   }
   
   static __inline uint64_t
   atomic_inc_64_nv(volatile uint64_t *target)
   {
           return (atomic_add_64_nv(target, 1));
   }
   
   static __inline uint64_t
   atomic_dec_64_nv(volatile uint64_t *target)
   {
           return (atomic_add_64_nv(target, -1));
   }
   
   #if !defined(COMPAT_32BIT) && defined(__LP64__)
   static __inline void *
   atomic_cas_ptr(volatile void *target, void *cmp,  void *newval)
   {
           return ((void *)atomic_cas_64((volatile uint64_t *)target,
               (uint64_t)cmp, (uint64_t)newval));
   }
   #else
   static __inline void *
   atomic_cas_ptr(volatile void *target, void *cmp,  void *newval)
   {
           return ((void *)atomic_cas_32((volatile uint32_t *)target,
               (uint32_t)cmp, (uint32_t)newval));
   }
   #endif  /* !defined(COMPAT_32BIT) && defined(__LP64__) */
   
   #else /* _STANDALONE */
   /*
    * sometimes atomic_add_64 is defined, sometimes not, but the
    * following is always right for the boot loader.
    */
   #undef atomic_add_64
   #define atomic_add_64(ptr, val) *(ptr) += val
   #undef atomic_sub_64
   #define atomic_sub_64(ptr, val) *(ptr) -= val
   #endif /* !_STANDALONE */
   
   #endif  /* !_OPENSOLARIS_SYS_ATOMIC_H_ */

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