78292efeef
Add a simplelock to deal with disable_intr()/enable_intr() as used in UP kernel. UP kernel expects that this is enough to guarantee exclusive access to regions of code bracketed by these 2 functions. Add a simplelock to bracket clock accesses in clock.c: clock_lock. Help from: Bruce Evans <bde@zeta.org.au>
227 lines
6.0 KiB
C
227 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 1.2 1997/08/30 07:51:10 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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/* Bottom half */
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#define CPL_LOCK() s_lock(&cpl_lock)
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#define CPL_UNLOCK() s_unlock(&cpl_lock)
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/* INT safe version for top half of kernel */
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#define SCPL_LOCK() ss_lock(&cpl_lock)
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#define SCPL_UNLOCK() ss_unlock(&cpl_lock)
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/* lock regions protected in UP kernel via cli/sti */
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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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#ifdef SIMPLE_MPINTRLOCK
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extern struct simplelock mpintr_lock;
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extern struct simplelock clock_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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