2645264a72
holding CPU along with the lock. When a CPU fails to get the lock it compares its own id to the holder id. If they are the same it panic()s, as simple locks are binary, and this would cause a deadlock. Controlled by smptests.h: SL_DEBUG, ON by default. Some minor cleanup.
226 lines
6.0 KiB
C
226 lines
6.0 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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* $Id: lock.h,v 1.3 1997/08/31 03:03:48 smp Exp smp $
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*/
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#ifndef _MACHINE_LOCK_H_
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#define _MACHINE_LOCK_H_
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/*
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* XXX some temp debug control of cpl locks
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*/
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#define REAL_ECPL /* exception.s: SCPL_LOCK/SCPL_UNLOCK */
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#define REAL_ICPL /* ipl.s: CPL_LOCK/CPL_UNLOCK/FAST */
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#define REAL_AICPL /* apic_ipl.s: SCPL_LOCK/SCPL_UNLOCK */
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#define REAL_AVCPL /* apic_vector.s: CPL_LOCK/CPL_UNLOCK */
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#define REAL_IFCPL /* ipl_funcs.c: SCPL_LOCK/SCPL_UNLOCK */
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#define REAL_MCPL_NOT /* microtime.s: CPL_LOCK/movl $0,_cpl_lock */
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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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* Some handy macros to allow logical organization and
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* convenient reassignment of various locks.
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*/
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#define FPU_LOCK call _get_fpu_lock
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#define ALIGN_LOCK call _get_align_lock
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#define SYSCALL_LOCK call _get_syscall_lock
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#define ALTSYSCALL_LOCK call _get_altsyscall_lock
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/*
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* Protects INTR() ISRs.
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*/
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#define ISR_TRYLOCK \
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pushl $_mp_lock ; /* GIANT_LOCK */ \
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call _MPtrylock ; /* try to get lock */ \
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add $4, %esp
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#define ISR_RELLOCK \
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pushl $_mp_lock ; /* GIANT_LOCK */ \
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call _MPrellock ; \
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add $4, %esp
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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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pushl $_imen_lock ; /* address of lock */ \
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call _s_unlock ; /* MP-safe */ \
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addl $4, %esp
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/*
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* Variations of CPL_LOCK protect spl updates as a critical region.
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* Items within this 'region' include:
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* cpl
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* cil
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* ipending
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* ???
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*/
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/*
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* Botom half routines, ie. those already protected from INTs.
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*
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* Used in:
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* sys/i386/i386/microtime.s (XXX currently NOT used, possible race?)
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* sys/i386/isa/ipl.s: _doreti
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* sys/i386/isa/apic_vector.s: _Xintr0, ..., _Xintr23
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*/
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#define CPL_LOCK \
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pushl $_cpl_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 CPL_UNLOCK \
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pushl $_cpl_lock ; /* address of lock */ \
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call _s_unlock ; /* MP-safe */ \
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addl $4, %esp
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/*
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* INT safe version for top half of kernel.
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*
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* Used in:
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* sys/i386/i386/exception.s: _Xfpu, _Xalign, _Xsyscall, _Xint0x80_syscall
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* sys/i386/isa/apic_ipl.s: splz()
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*/
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#define SCPL_LOCK \
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pushl $_cpl_lock ; \
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call _ss_lock ; \
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addl $4, %esp
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#define SCPL_UNLOCK \
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pushl $_cpl_lock ; \
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call _ss_unlock ; \
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addl $4, %esp
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#else /* SMP */
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#define MPLOCKED /* NOP */
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#define FPU_LOCK /* NOP */
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#define ALIGN_LOCK /* NOP */
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#define SYSCALL_LOCK /* NOP */
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#define ALTSYSCALL_LOCK /* 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_MPINTR_LOCK */
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/*
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* Protects cpl/cml/cil/ipending data as a critical region.
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*
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* Used in:
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* sys/i386/isa/ipl_funcs.c: DO_SETBITS, softclockpending(), GENSPL,
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* spl0(), splx(), splq()
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*/
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#define CPL_LOCK() s_lock(&cpl_lock) /* Bottom end */
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#define CPL_UNLOCK() s_unlock(&cpl_lock)
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#define SCPL_LOCK() ss_lock(&cpl_lock) /* INT safe: top end */
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#define SCPL_UNLOCK() ss_unlock(&cpl_lock)
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/*
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* Locks regions protected in UP kernel via cli/sti.
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*/
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#if defined(SIMPLE_MPINTRLOCK)
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#define MPINTR_LOCK() s_lock(&mpintr_lock)
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#define MPINTR_UNLOCK() s_unlock(&mpintr_lock)
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#elif defined(RECURSIVE_MPINTRLOCK)
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#define MPINTR_LOCK() get_mpintrlock()
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#define MPINTR_UNLOCK() rel_mpintrlock();
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#else
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#error whats up doc?
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#endif /* _MPINTRLOCK */
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#else /* SMP */
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#define CPL_LOCK()
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#define CPL_UNLOCK()
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#define SCPL_LOCK()
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#define SCPL_UNLOCK()
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#define MPINTR_LOCK()
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#define MPINTR_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 s_unlock __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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/* 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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#ifdef SIMPLE_MPINTRLOCK
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extern struct simplelock mpintr_lock;
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#endif/* SIMPLE_MPINTRLOCK */
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#if !defined(SIMPLELOCK_DEBUG) && NCPUS > 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 && NCPUS > 1 */
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#endif /* LOCORE */
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#endif /* !_MACHINE_LOCK_H_ */
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