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/*
* Copyright (c) 1997, by Steve Passe
* All rights reserved.
*
* 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. The name of the developer may NOT be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* 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.
*
* $FreeBSD$
*/
#ifndef _MACHINE_LOCK_H_
#define _MACHINE_LOCK_H_
#ifdef LOCORE
#ifdef SMP
#define MPLOCKED lock ;
/*
* Protects the IO APIC and apic_imen as a critical region.
*/
#define IMASK_LOCK \
pushl $_imen_lock ; /* address of lock */ \
call _s_lock ; /* MP-safe */ \
addl $4, %esp
#define IMASK_UNLOCK \
movl $0, _imen_lock
#else /* SMP */
#define MPLOCKED /* NOP */
#define IMASK_LOCK /* NOP */
#define IMASK_UNLOCK /* NOP */
#endif /* SMP */
#else /* LOCORE */
#ifdef SMP
#include <machine/smptests.h> /** xxx_LOCK */
/*
* sio/cy lock.
* XXX should rc (RISCom/8) use this?
*/
#ifdef USE_COMLOCK
#define COM_LOCK() s_lock(&com_lock)
#define COM_UNLOCK() s_unlock(&com_lock)
#else
#define COM_LOCK()
#define COM_UNLOCK()
#endif /* USE_COMLOCK */
/*
* Clock hardware/struct lock.
* XXX pcaudio and friends still need this lock installed.
*/
#ifdef USE_CLOCKLOCK
#define CLOCK_LOCK() s_lock(&clock_lock)
#define CLOCK_UNLOCK() s_unlock(&clock_lock)
#else
#define CLOCK_LOCK()
#define CLOCK_UNLOCK()
#endif /* USE_CLOCKLOCK */
#else /* SMP */
#define COM_LOCK()
#define COM_UNLOCK()
#define CLOCK_LOCK()
#define CLOCK_UNLOCK()
#endif /* SMP */
/*
* Simple spin lock.
* It is an error to hold one of these locks while a process is sleeping.
*/
struct simplelock {
volatile int lock_data;
};
/* functions in simplelock.s */
void s_lock_init __P((struct simplelock *));
void s_lock __P((struct simplelock *));
int s_lock_try __P((struct simplelock *));
void ss_lock __P((struct simplelock *));
void ss_unlock __P((struct simplelock *));
void s_lock_np __P((struct simplelock *));
void s_unlock_np __P((struct simplelock *));
/* inline simplelock functions */
static __inline void
s_unlock(struct simplelock *lkp)
{
lkp->lock_data = 0;
}
/* global data in mp_machdep.c */
extern struct simplelock imen_lock;
extern struct simplelock cpl_lock;
extern struct simplelock fast_intr_lock;
extern struct simplelock intr_lock;
extern struct simplelock clock_lock;
extern struct simplelock com_lock;
extern struct simplelock mpintr_lock;
extern struct simplelock mcount_lock;
extern struct simplelock panic_lock;
#if !defined(SIMPLELOCK_DEBUG) && NCPUS > 1
/*
* This set of defines turns on the real functions in i386/isa/apic_ipl.s.
*/
#define simple_lock_init(alp) s_lock_init(alp)
#define simple_lock(alp) s_lock(alp)
#define simple_lock_try(alp) s_lock_try(alp)
#define simple_unlock(alp) s_unlock(alp)
#endif /* !SIMPLELOCK_DEBUG && NCPUS > 1 */
#endif /* LOCORE */
#endif /* !_MACHINE_LOCK_H_ */
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