151 lines
4.0 KiB
C
151 lines
4.0 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2019 Justin Hibbits
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/cdefs.h>
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/smp.h>
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#include <sys/systm.h>
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#include <machine/atomic.h>
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#include <machine/param.h>
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#include <vm/vm.h>
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#include <vm/pmap.h>
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enum {
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ATOMIC64_ADD,
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ATOMIC64_CLEAR,
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ATOMIC64_CMPSET,
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ATOMIC64_FCMPSET,
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ATOMIC64_FETCHADD,
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ATOMIC64_LOAD,
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ATOMIC64_SET,
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ATOMIC64_SUBTRACT,
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ATOMIC64_STORE,
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ATOMIC64_SWAP
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};
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#ifdef _KERNEL
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#ifdef SMP
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#define A64_POOL_SIZE MAXCPU
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/* Estimated size of a cacheline */
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#define CACHE_ALIGN CACHE_LINE_SIZE
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static struct mtx a64_mtx_pool[A64_POOL_SIZE];
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#define GET_MUTEX(p) \
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(&a64_mtx_pool[(pmap_kextract((vm_offset_t)p) / CACHE_ALIGN) % (A64_POOL_SIZE)])
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#define LOCK_A64() \
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struct mtx *_amtx = GET_MUTEX(p); \
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if (smp_started) mtx_lock(_amtx)
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#define UNLOCK_A64() if (smp_started) mtx_unlock(_amtx)
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#else /* !SMP */
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#define LOCK_A64() { register_t s = intr_disable()
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#define UNLOCK_A64() intr_restore(s); }
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#endif /* SMP */
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#define ATOMIC64_EMU_UN(op, rt, block, ret) \
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rt \
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atomic_##op##_64(volatile u_int64_t *p) { \
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u_int64_t tmp __unused; \
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LOCK_A64(); \
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block; \
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UNLOCK_A64(); \
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ret; } struct hack
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#define ATOMIC64_EMU_BIN(op, rt, block, ret) \
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rt \
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atomic_##op##_64(volatile u_int64_t *p, u_int64_t v) { \
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u_int64_t tmp __unused; \
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LOCK_A64(); \
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block; \
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UNLOCK_A64(); \
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ret; } struct hack
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ATOMIC64_EMU_BIN(add, void, (*p = *p + v), return);
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ATOMIC64_EMU_BIN(clear, void, *p &= ~v, return);
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ATOMIC64_EMU_BIN(fetchadd, u_int64_t, (*p = *p + v, v = *p - v), return (v));
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ATOMIC64_EMU_UN(load, u_int64_t, (tmp = *p), return (tmp));
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ATOMIC64_EMU_BIN(set, void, *p |= v, return);
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ATOMIC64_EMU_BIN(subtract, void, (*p = *p - v), return);
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ATOMIC64_EMU_BIN(store, void, *p = v, return);
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ATOMIC64_EMU_BIN(swap, u_int64_t, tmp = *p; *p = v; v = tmp, return(v));
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int atomic_cmpset_64(volatile u_int64_t *p, u_int64_t old, u_int64_t new)
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{
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u_int64_t tmp;
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LOCK_A64();
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tmp = *p;
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if (tmp == old)
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*p = new;
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UNLOCK_A64();
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return (tmp == old);
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}
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int atomic_fcmpset_64(volatile u_int64_t *p, u_int64_t *old, u_int64_t new)
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{
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u_int64_t tmp, tmp_old;
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LOCK_A64();
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tmp = *p;
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tmp_old = *old;
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if (tmp == tmp_old)
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*p = new;
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else
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*old = tmp;
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UNLOCK_A64();
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return (tmp == tmp_old);
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}
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#ifdef SMP
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static void
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atomic64_mtxinit(void *x __unused)
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{
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int i;
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for (i = 0; i < A64_POOL_SIZE; i++)
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mtx_init(&a64_mtx_pool[i], "atomic64 mutex", NULL, MTX_DEF);
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}
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SYSINIT(atomic64_mtxinit, SI_SUB_LOCK, SI_ORDER_MIDDLE, atomic64_mtxinit, NULL);
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#endif /* SMP */
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#endif /* _KERNEL */
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