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

     /*
      *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
      *  Copyright (C) 2007 The Regents of the University of California.
      *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
      *  Written by Brian Behlendorf <behlendorf1@llnl.gov>.
      *  UCRL-CODE-235197
      *
      *  This file is part of the SPL, Solaris Porting Layer.
      *
     *  The SPL is free software; you can redistribute it and/or modify it
     *  under the terms of the GNU General Public License as published by the
     *  Free Software Foundation; either version 2 of the License, or (at your
     *  option) any later version.
     *
     *  The SPL is distributed in the hope that it will be useful, but WITHOUT
     *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
     *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
     *  for more details.
     *
     *  You should have received a copy of the GNU General Public License along
     *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
     */
    
    #ifndef _SPL_ATOMIC_H
    #define _SPL_ATOMIC_H
    
    #include <linux/module.h>
    #include <linux/spinlock.h>
    #include <sys/types.h>
    
    /*
     * Map the atomic_* functions to the Linux counterparts.  This relies on the
     * fact that the atomic types are internally really a uint32 or uint64.  If
     * this were to change an alternate approach would be needed.
     *
     * N.B. Due to the limitations of the original API atomicity is not strictly
     * preserved when using the 64-bit functions on a 32-bit system.  In order
     * to support this all consumers would need to be updated to use the Linux
     * provided atomic_t and atomic64_t types.
     */
    #define atomic_inc_32(v)        atomic_inc((atomic_t *)(v))
    #define atomic_dec_32(v)        atomic_dec((atomic_t *)(v))
    #define atomic_add_32(v, i)     atomic_add((i), (atomic_t *)(v))
    #define atomic_sub_32(v, i)     atomic_sub((i), (atomic_t *)(v))
    #define atomic_inc_32_nv(v)     atomic_inc_return((atomic_t *)(v))
    #define atomic_dec_32_nv(v)     atomic_dec_return((atomic_t *)(v))
    #define atomic_add_32_nv(v, i)  atomic_add_return((i), (atomic_t *)(v))
    #define atomic_sub_32_nv(v, i)  atomic_sub_return((i), (atomic_t *)(v))
    #define atomic_cas_32(v, x, y)  atomic_cmpxchg((atomic_t *)(v), x, y)
    #define atomic_swap_32(v, x)    atomic_xchg((atomic_t *)(v), x)
    #define atomic_load_32(v)       atomic_read((atomic_t *)(v))
    #define atomic_store_32(v, x)   atomic_set((atomic_t *)(v), x)
    #define atomic_inc_64(v)        atomic64_inc((atomic64_t *)(v))
    #define atomic_dec_64(v)        atomic64_dec((atomic64_t *)(v))
    #define atomic_add_64(v, i)     atomic64_add((i), (atomic64_t *)(v))
    #define atomic_sub_64(v, i)     atomic64_sub((i), (atomic64_t *)(v))
    #define atomic_inc_64_nv(v)     atomic64_inc_return((atomic64_t *)(v))
    #define atomic_dec_64_nv(v)     atomic64_dec_return((atomic64_t *)(v))
    #define atomic_add_64_nv(v, i)  atomic64_add_return((i), (atomic64_t *)(v))
    #define atomic_sub_64_nv(v, i)  atomic64_sub_return((i), (atomic64_t *)(v))
    #define atomic_cas_64(v, x, y)  atomic64_cmpxchg((atomic64_t *)(v), x, y)
    #define atomic_swap_64(v, x)    atomic64_xchg((atomic64_t *)(v), x)
    #define atomic_load_64(v)       atomic64_read((atomic64_t *)(v))
    #define atomic_store_64(v, x)   atomic64_set((atomic64_t *)(v), x)
    
    #ifdef _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 /* _LP64 */
    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 /* _LP64 */
    
    #endif  /* _SPL_ATOMIC_H */

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