| /* |
| * 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. |
| * For details, see <http://zfsonlinux.org/>. |
| * |
| * 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_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) |
| |
| #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 */ |