77 lines
2.5 KiB
C
77 lines
2.5 KiB
C
/*
|
|
* 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_
|
|
|
|
|
|
/*
|
|
* Simple spin lock.
|
|
* It is an error to hold one of these locks while a process is sleeping.
|
|
*/
|
|
struct simplelock {
|
|
volatile u_int lock_data;
|
|
};
|
|
|
|
/* functions in mp_machdep.c */
|
|
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)
|
|
{
|
|
alpha_mb();
|
|
lkp->lock_data = 0;
|
|
}
|
|
|
|
extern struct simplelock panic_lock;
|
|
|
|
#if !defined(SIMPLELOCK_DEBUG) && MAXCPU > 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 && MAXCPU > 1 */
|
|
|
|
#define COM_LOCK()
|
|
#define COM_UNLOCK()
|
|
#define COM_DISABLE_INTR() COM_LOCK()
|
|
#define COM_ENABLE_INTR() COM_UNLOCK()
|
|
|
|
#endif /* !_MACHINE_LOCK_H_ */
|