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Machine-dependent spin lock operations for Alpha, included if MULTIPROCESSOR 

is specified.
This commit is contained in:
thorpej 1998-09-24 22:32:35 +00:00
parent 0c11d72456
commit 3cde5f5817
3 changed files with 141 additions and 1 deletions
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90
sys/arch/alpha/alpha/lock_machdep.c Normal file
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@ -0,0 +1,90 @@
/* $NetBSD: lock_machdep.c,v 1.1 1998/09/24 22:32:35 thorpej Exp $ */
/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
* NASA Ames Research Center.
*
* 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 by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
__KERNEL_RCSID(0, "$NetBSD: lock_machdep.c,v 1.1 1998/09/24 22:32:35 thorpej Exp $");
/*
* Machine-dependent spin lock operations.
*/
#include <sys/types.h>
#include <sys/lock.h>
#include <machine/alpha_cpu.h>
void
simple_lock_init(alp)
__volatile struct simplelock *alp;
{
alp->lock_data = 0;
alpha_mb();
}
void
simple_lock(alp)
__volatile struct simplelock *alp;
{
/* atomic operation performs barrier */
while (alpha_atomic_testset_l((unsigned int *)&alp->lock_data, 1) == 0)
/* spin */ ;
}
int
simple_lock_try(alp)
__volatile struct simplelock *alp;
{
/* atomic operation performs barrier */
if (alpha_atomic_testset_l((unsigned int *)&alp->lock_data, 1))
return (1);
return (0);
}
void
simple_unlock(alp)
__volatile struct simplelock *alp;
{
alp->lock_data = 0;
alpha_mb();
}

3
sys/arch/alpha/conf/files.alpha
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@ -1,4 +1,4 @@
# $NetBSD: files.alpha,v 1.90 1998/09/24 05:36:06 ross Exp $
# $NetBSD: files.alpha,v 1.91 1998/09/24 22:32:36 thorpej Exp $
#
# alpha-specific configuration info
@ -387,6 +387,7 @@ file arch/alpha/alpha/clock.c
file arch/alpha/alpha/conf.c
file arch/alpha/alpha/cpuconf.c
file arch/alpha/alpha/interrupt.c
file arch/alpha/alpha/lock_machdep.c multiprocessor
file arch/alpha/alpha/machdep.c
file arch/alpha/alpha/mainbus.c
file arch/alpha/alpha/mem.c

49
sys/arch/alpha/include/lock.h Normal file
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@ -0,0 +1,49 @@
/* $NetBSD: lock.h,v 1.1 1998/09/24 22:32:35 thorpej Exp $ */
/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
* NASA Ames Research Center.
*
* 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 by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
/*
* Machine-dependent spin lock operations.
*/
#if defined(_KERNEL)
void simple_lock_init __P((__volatile struct simplelock *));
void simple_lock __P((__volatile struct simplelock *));
int simple_lock_try __P((__volatile struct simplelock *));
void simple_unlock __P((__volatile struct simplelock *));
#endif /* _KERNEL */