lock_machdep.c moved here from arch/i386/i386.
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fvdl
parent
f555536d9b
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0cb6724bc7
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@ -1,7 +1,7 @@
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# $NetBSD: files.x86,v 1.3 2003/02/27 01:50:40 fvdl Exp $
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# $NetBSD: files.x86,v 1.4 2003/03/01 22:55:02 fvdl Exp $
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# options for MP configuration through the MP spec
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defflag opt_mpbios.h MPBIOS MPVERBOSE MPDEBUGA
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defflag opt_mpbios.h MPBIOS MPVERBOSE MPDEBUG
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# MTRR support
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defflag MTRR
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@ -9,13 +9,14 @@ defflag MTRR
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define mainbus { [apid = -1] }
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file arch/x86/x86/apic.c ioapic | lapic
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file arch/x86/x86/bus_machdep.c
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file arch/x86/x86/consinit.c
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file arch/x86/x86/i8259.c
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file arch/x86/x86/intr.c
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file arch/x86/x86/softintr.c
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file arch/x86/x86/bus_machdep.c
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file arch/x86/x86/ipi.c multiprocessor
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file arch/x86/x86/lock_machdep.c lockdebug
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file arch/x86/x86/mtrr_i686.c mtrr
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file arch/x86/x86/softintr.c
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define lapic
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file arch/x86/x86/lapic.c lapic needs-flag
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@ -0,0 +1,143 @@
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/* $NetBSD: lock_machdep.c,v 1.1 2003/03/01 22:55:02 fvdl Exp $ */
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/*-
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* Copyright (c) 1998, 1999 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
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* NASA Ames Research Center.
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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. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
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/*
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* Machine-dependent spin lock operations.
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*/
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#include "opt_ddb.h"
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#include <sys/types.h>
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#include <sys/lock.h>
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#include <sys/systm.h>
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#include <machine/atomic.h>
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#include <machine/cpu.h>
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#include <ddb/db_output.h>
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void
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__cpu_simple_lock_init(lockp)
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__cpu_simple_lock_t *lockp;
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{
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*lockp = __SIMPLELOCK_UNLOCKED;
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}
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#if defined (DEBUG) && defined(DDB)
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int spin_limit = 10000000;
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__cpu_simple_lock_t *wantlock[X86_MAXPROCS], *gotlock[X86_MAXPROCS];
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#endif
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void
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__cpu_simple_lock(lockp)
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__cpu_simple_lock_t *lockp;
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{
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#if defined (DEBUG)
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#if defined(DDB)
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int spincount = 0;
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int cpu = cpu_number();
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int limit = spin_limit * (cpu + 1);
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#endif
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__cpu_simple_lock_t v = *lockp;
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KDASSERT((v == __SIMPLELOCK_LOCKED) || (v == __SIMPLELOCK_UNLOCKED));
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#if defined(DDB)
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wantlock[cpu] = lockp;
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#endif
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#endif
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while (x86_atomic_testset_i(lockp, __SIMPLELOCK_LOCKED) ==
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__SIMPLELOCK_LOCKED) {
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#if defined(DEBUG) && defined(DDB)
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spincount++;
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if (spincount == limit) {
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extern int db_active;
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spincount = 0;
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if (db_active) {
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db_printf("cpu%d: spinout while in debugger\n",
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cpu);
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while (db_active)
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;
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}
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db_printf("cpu%d: spinout\n", cpu);
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Debugger();
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}
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#endif
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}
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#if defined(DEBUG) && defined(DDB)
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wantlock[cpu] = 0;
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gotlock[cpu] = lockp;
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#endif
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__lockbarrier();
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}
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int
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__cpu_simple_lock_try(lockp)
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__cpu_simple_lock_t *lockp;
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{
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int r;
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#ifdef DEBUG
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__cpu_simple_lock_t v = *lockp;
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KDASSERT((v == __SIMPLELOCK_LOCKED) || (v == __SIMPLELOCK_UNLOCKED));
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#endif
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r = (x86_atomic_testset_i(lockp, __SIMPLELOCK_LOCKED)
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== __SIMPLELOCK_UNLOCKED);
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__lockbarrier();
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return (r);
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}
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void
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__cpu_simple_unlock(lockp)
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__cpu_simple_lock_t *lockp;
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{
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#ifdef DEBUG
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__cpu_simple_lock_t v = *lockp;
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KDASSERT((v == __SIMPLELOCK_LOCKED) || (v == __SIMPLELOCK_UNLOCKED));
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#endif
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__lockbarrier();
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*lockp = __SIMPLELOCK_UNLOCKED;
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}
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