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/* $NetBSD: mutex.h,v 1.3 2021/08/25 04:13:41 thorpej Exp $ */
/*-
* Copyright (c) 2002, 2007 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe and Andrew Doran.
*
* 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
#ifndef _OR1K_MUTEX_H_
#define _OR1K_MUTEX_H_
#ifndef __MUTEX_PRIVATE
struct kmutex {
uintptr_t mtx_pad1;
};
#else /* __MUTEX_PRIVATE */
struct kmutex {
union {
/* Adaptive mutex */
volatile uintptr_t mtxa_owner;
/* Spin mutex */
struct {
/*
* Since the low bit of mtax_owner is used to flag this
* mutex as a spin mutex, we can't use the first byte
* or the last byte to store the ipl or lock values.
*/
volatile uint8_t mtxs_dummy;
ipl_cookie_t mtxs_ipl;
__cpu_simple_lock_t mtxs_lock;
volatile uint8_t mtxs_unused;
} s;
} u;
};
#define mtx_owner u.mtxa_owner
#define mtx_ipl u.s.mtxs_ipl
#define mtx_lock u.s.mtxs_lock
#if 0
#define __HAVE_MUTEX_STUBS 1
#define __HAVE_SPIN_MUTEX_STUBS 1
#endif
#define __HAVE_SIMPLE_MUTEXES 1
#endif /* __MUTEX_PRIVATE */
#endif /* _OR1K_MUTEX_H_ */
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