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#ifndef _M88K_MUTEX_H_
#define _M88K_MUTEX_H_
/* $OpenBSD: mutex.h,v 1.4 2015/07/03 15:12:49 miod Exp $ */
/*
* Copyright (c) 2005, Miodrag Vallat.
*
* 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 ``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 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.
*/
struct mutex {
volatile int mtx_lock; /* mutex.S relies upon this field being first */
int mtx_wantipl;
int mtx_oldipl;
void *mtx_owner;
};
/*
* To prevent lock ordering problems with the kernel lock, we need to
* make sure we block all interrupts that can grab the kernel lock.
* The simplest way to achieve this is to make sure mutexes always
* raise the interrupt priority level to the highest level that has
* interrupts that grab the kernel lock.
*/
#ifdef MULTIPROCESSOR
#define __MUTEX_IPL(ipl) \
(((ipl) > IPL_NONE && (ipl) < IPL_TTY) ? IPL_TTY : (ipl))
#else
#define __MUTEX_IPL(ipl) (ipl)
#endif
#define MUTEX_INITIALIZER(ipl) { 0, __MUTEX_IPL((ipl)), IPL_NONE, NULL }
void __mtx_init(struct mutex *, int);
#define mtx_init(mtx, ipl) __mtx_init((mtx), __MUTEX_IPL((ipl)))
#ifdef DIAGNOSTIC
#define MUTEX_ASSERT_LOCKED(mtx) do { \
if ((mtx)->mtx_owner != curcpu()) \
panic("mutex %p not held in %s", (mtx), __func__); \
} while (0)
#define MUTEX_ASSERT_UNLOCKED(mtx) do { \
if ((mtx)->mtx_owner == curcpu()) \
panic("mutex %p held in %s", (mtx), __func__); \
} while (0)
#else
#define MUTEX_ASSERT_LOCKED(mtx) do { /* nothing */ } while (0)
#define MUTEX_ASSERT_UNLOCKED(mtx) do { /* nothing */ } while (0)
#endif
#define MUTEX_OLDIPL(mtx) (mtx)->mtx_oldipl
#endif /* _M88K_MUTEX_H_ */
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