NetBSD/sys/arch/vax/include/lock.h

158 lines
4.3 KiB
C

/* $NetBSD: lock.h,v 1.8 2001/06/04 21:37:12 ragge Exp $ */
/*
* Copyright (c) 2000 Ludd, University of Lule}, Sweden.
* 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. 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed at Ludd, University of Lule}.
* 4. The name of the author 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 ``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.
*/
#ifndef _VAX_LOCK_H_
#define _VAX_LOCK_H_
typedef __volatile int __cpu_simple_lock_t;
#define __SIMPLELOCK_LOCKED 1
#define __SIMPLELOCK_UNLOCKED 0
static __inline void
__cpu_simple_lock_init(__cpu_simple_lock_t *alp)
{
__asm__ __volatile ("movl %0,r1;jsb Sunlock"
: /* No output */
: "g"(alp)
: "r1","cc","memory");
#if 0
__asm__ __volatile ("bbcci $0, %0, 1f;1:"
: /* No output */
: "m"(*alp));
#endif
}
static __inline int
__cpu_simple_lock_try(__cpu_simple_lock_t *alp)
{
int ret;
__asm__ __volatile ("movl %1,r1;jsb Slocktry;movl r0,%0"
: "=&r"(ret)
: "g"(alp)
: "r0","r1","cc","memory");
#if 0
__asm__ __volatile ("movl $0,%0;bbssi $0,%1,1f;incl %0;1:"
: "=&r"(ret)
: "m"(*alp));
#endif
return ret;
}
#define VAX_LOCK_CHECKS ((1 << IPI_SEND_CNCHAR) | (1 << IPI_DDB))
#define __cpu_simple_lock(alp) \
{ \
struct cpu_info *__ci = curcpu(); \
\
while (__cpu_simple_lock_try(alp) == 0) { \
int __s; \
\
if (__ci->ci_ipimsgs & VAX_LOCK_CHECKS) { \
__s = splipi(); \
cpu_handle_ipi(); \
splx(__s); \
} \
} \
}
#if 0
static __inline void
__cpu_simple_lock(__cpu_simple_lock_t *alp)
{
struct cpu_info *ci = curcpu();
while (__cpu_simple_lock_try(alp) == 0) {
int s;
if (ci->ci_ipimsgs & IPI_SEND_CNCHAR) {
s = splipi();
cpu_handle_ipi();
splx(s);
}
}
#if 0
__asm__ __volatile ("movl %0,r1;jsb Slock"
: /* No output */
: "g"(alp)
: "r0","r1","cc","memory");
#endif
#if 0
__asm__ __volatile ("1:;bbssi $0, %0, 1b"
: /* No output */
: "m"(*alp));
#endif
}
#endif
static __inline void
__cpu_simple_unlock(__cpu_simple_lock_t *alp)
{
__asm__ __volatile ("movl %0,r1;jsb Sunlock"
: /* No output */
: "g"(alp)
: "r1","cc","memory");
#if 0
__asm__ __volatile ("bbcci $0, %0, 1f;1:"
: /* No output */
: "m"(*alp));
#endif
}
#if defined(MULTIPROCESSOR)
/*
* On the Vax, interprocessor interrupts can come in at device priority
* level or lower. This can cause some problems while waiting for r/w
* spinlocks from a high'ish priority level: IPIs that come in will not
* be processed. This can lead to deadlock.
*
* This hook allows IPIs to be processed while a spinlock's interlock
* is released.
*/
#define SPINLOCK_SPIN_HOOK \
do { \
struct cpu_info *__ci = curcpu(); \
int __s; \
\
if (__ci->ci_ipimsgs != 0) { \
/* printf("CPU %lu has IPIs pending\n", \
__ci->ci_cpuid); */ \
__s = splipi(); \
cpu_handle_ipi(); \
splx(__s); \
} \
} while (0)
#endif /* MULTIPROCESSOR */
#endif /* _VAX_LOCK_H_ */