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/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2019 Justin Hibbits
*
* 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 AUTHOR 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 AUTHOR 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.
*/
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/smp.h>
#include <sys/systm.h>
#include <machine/atomic.h>
#include <machine/param.h>
#include <vm/vm.h>
#include <vm/pmap.h>
enum {
ATOMIC64_ADD,
ATOMIC64_CLEAR,
ATOMIC64_CMPSET,
ATOMIC64_FCMPSET,
ATOMIC64_FETCHADD,
ATOMIC64_LOAD,
ATOMIC64_SET,
ATOMIC64_SUBTRACT,
ATOMIC64_STORE,
ATOMIC64_SWAP
};
#ifdef _KERNEL
#ifdef SMP
#define A64_POOL_SIZE MAXCPU
/* Estimated size of a cacheline */
#define CACHE_ALIGN CACHE_LINE_SIZE
static struct mtx a64_mtx_pool[A64_POOL_SIZE];
#define GET_MUTEX(p) \
(&a64_mtx_pool[(pmap_kextract((vm_offset_t)p) / CACHE_ALIGN) % (A64_POOL_SIZE)])
#define LOCK_A64() \
struct mtx *_amtx = GET_MUTEX(p); \
if (smp_started) mtx_lock(_amtx)
#define UNLOCK_A64() if (smp_started) mtx_unlock(_amtx)
#else /* !SMP */
#define LOCK_A64() { register_t s = intr_disable()
#define UNLOCK_A64() intr_restore(s); }
#endif /* SMP */
#define ATOMIC64_EMU_UN(op, rt, block, ret) \
rt \
atomic_##op##_64(const volatile uint64_t *p) { \
uint64_t tmp __unused; \
LOCK_A64(); \
block; \
UNLOCK_A64(); \
ret; } struct hack
#define ATOMIC64_EMU_BIN(op, rt, block, ret) \
rt \
atomic_##op##_64(volatile uint64_t *p, uint64_t v) { \
uint64_t tmp __unused; \
LOCK_A64(); \
block; \
UNLOCK_A64(); \
ret; } struct hack
ATOMIC64_EMU_BIN(add, void, (*p = *p + v), return);
ATOMIC64_EMU_BIN(clear, void, *p &= ~v, return);
ATOMIC64_EMU_BIN(fetchadd, uint64_t, (*p = *p + v, v = *p - v), return (v));
ATOMIC64_EMU_UN(load, uint64_t, (tmp = *p), return (tmp));
ATOMIC64_EMU_BIN(set, void, *p |= v, return);
ATOMIC64_EMU_BIN(subtract, void, (*p = *p - v), return);
ATOMIC64_EMU_BIN(store, void, *p = v, return);
ATOMIC64_EMU_BIN(swap, uint64_t, tmp = *p; *p = v; v = tmp, return(v));
int atomic_cmpset_64(volatile uint64_t *p, uint64_t old, uint64_t new)
{
uint64_t tmp;
LOCK_A64();
tmp = *p;
if (tmp == old)
*p = new;
UNLOCK_A64();
return (tmp == old);
}
int atomic_fcmpset_64(volatile uint64_t *p, uint64_t *old, uint64_t new)
{
uint64_t tmp, tmp_old;
LOCK_A64();
tmp = *p;
tmp_old = *old;
if (tmp == tmp_old)
*p = new;
else
*old = tmp;
UNLOCK_A64();
return (tmp == tmp_old);
}
#ifdef SMP
static void
atomic64_mtxinit(void *x __unused)
{
int i;
for (i = 0; i < A64_POOL_SIZE; i++)
mtx_init(&a64_mtx_pool[i], "atomic64 mutex", NULL, MTX_DEF);
}
SYSINIT(atomic64_mtxinit, SI_SUB_LOCK, SI_ORDER_MIDDLE, atomic64_mtxinit, NULL);
#endif /* SMP */
#endif /* _KERNEL */
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