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/*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2019 Western Digital Corporation or its affiliates.
* Copyright (c) 2021 Christoph Müllner <cmuellner@linux.com>
*/
#ifndef __RISCV_LOCKS_H__
#define __RISCV_LOCKS_H__
#include <sbi/sbi_types.h>
#define TICKET_SHIFT 16
typedef struct {
#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
u16 next;
u16 owner;
#else
u16 owner;
u16 next;
#endif
} __aligned(4) spinlock_t;
#define __SPIN_LOCK_UNLOCKED \
(spinlock_t) { 0, 0 }
#define SPIN_LOCK_INIT(x) \
x = __SPIN_LOCK_UNLOCKED
#define SPIN_LOCK_INITIALIZER \
__SPIN_LOCK_UNLOCKED
#define DEFINE_SPIN_LOCK(x) \
spinlock_t SPIN_LOCK_INIT(x)
int spin_lock_check(spinlock_t *lock);
int spin_trylock(spinlock_t *lock);
void spin_lock(spinlock_t *lock);
void spin_unlock(spinlock_t *lock);
#endif
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