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147 lines
3.8 KiB
C
147 lines
3.8 KiB
C
/*
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* Copyright (c) 1997, by Steve Passe
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. The name of the developer may NOT be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _MACHINE_LOCK_H_
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#define _MACHINE_LOCK_H_
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#ifdef LOCORE
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#ifdef SMP
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#define MPLOCKED lock ;
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/*
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* Protects the IO APIC and apic_imen as a critical region.
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*/
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#define IMASK_LOCK \
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pushl $_imen_lock ; /* address of lock */ \
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call _s_lock ; /* MP-safe */ \
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addl $4, %esp
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#define IMASK_UNLOCK \
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movl $0, _imen_lock
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#else /* SMP */
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#define MPLOCKED /* NOP */
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#define IMASK_LOCK /* NOP */
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#define IMASK_UNLOCK /* NOP */
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#endif /* SMP */
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#else /* LOCORE */
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#ifdef SMP
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#include <machine/smptests.h> /** xxx_LOCK */
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/*
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* sio/cy lock.
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* XXX should rc (RISCom/8) use this?
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*/
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#ifdef USE_COMLOCK
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#define COM_LOCK() s_lock(&com_lock)
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#define COM_UNLOCK() s_unlock(&com_lock)
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#else
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#define COM_LOCK()
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#define COM_UNLOCK()
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#endif /* USE_COMLOCK */
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/*
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* Clock hardware/struct lock.
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* XXX pcaudio and friends still need this lock installed.
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*/
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#ifdef USE_CLOCKLOCK
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#define CLOCK_LOCK() s_lock(&clock_lock)
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#define CLOCK_UNLOCK() s_unlock(&clock_lock)
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#else
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#define CLOCK_LOCK()
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#define CLOCK_UNLOCK()
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#endif /* USE_CLOCKLOCK */
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#else /* SMP */
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#define COM_LOCK()
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#define COM_UNLOCK()
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#define CLOCK_LOCK()
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#define CLOCK_UNLOCK()
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#endif /* SMP */
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/*
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* Simple spin lock.
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* It is an error to hold one of these locks while a process is sleeping.
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*/
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struct simplelock {
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volatile int lock_data;
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};
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/* functions in simplelock.s */
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void s_lock_init __P((struct simplelock *));
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void s_lock __P((struct simplelock *));
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int s_lock_try __P((struct simplelock *));
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void ss_lock __P((struct simplelock *));
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void ss_unlock __P((struct simplelock *));
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void s_lock_np __P((struct simplelock *));
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void s_unlock_np __P((struct simplelock *));
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/* inline simplelock functions */
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static __inline void
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s_unlock(struct simplelock *lkp)
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{
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lkp->lock_data = 0;
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}
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/* global data in mp_machdep.c */
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extern struct simplelock imen_lock;
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extern struct simplelock cpl_lock;
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extern struct simplelock fast_intr_lock;
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extern struct simplelock intr_lock;
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extern struct simplelock clock_lock;
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extern struct simplelock com_lock;
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extern struct simplelock mpintr_lock;
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extern struct simplelock mcount_lock;
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extern struct simplelock panic_lock;
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#if !defined(SIMPLELOCK_DEBUG) && MAXCPU > 1
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/*
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* This set of defines turns on the real functions in i386/isa/apic_ipl.s.
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*/
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#define simple_lock_init(alp) s_lock_init(alp)
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#define simple_lock(alp) s_lock(alp)
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#define simple_lock_try(alp) s_lock_try(alp)
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#define simple_unlock(alp) s_unlock(alp)
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#endif /* !SIMPLELOCK_DEBUG && MAXCPU > 1 */
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#endif /* LOCORE */
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#endif /* !_MACHINE_LOCK_H_ */
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