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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2018 HardenedLinux.
*
* This program 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; version 2 of the License.
*
* This program 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.
*/
#ifndef ARCH_SMP_SPINLOCK_H
#define ARCH_SMP_SPINLOCK_H
#include <arch/encoding.h>
#include <arch/smp/atomic.h>
#define barrier() { asm volatile ("fence" ::: "memory"); }
typedef struct {
atomic_t lock;
} spinlock_t;
static inline void spinlock_lock(spinlock_t *lock)
{
while (atomic_swap(&lock->lock, -1))
;
barrier();
}
static inline void spinlock_unlock(spinlock_t *lock)
{
barrier();
atomic_set(&lock->lock, 0);
}
#endif // ARCH_SMP_SPINLOCK_H
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