5c623cb649
- A nonprofiling version of s_lock (called s_lock_np) is used
by mcount.
- When profiling is active, more registers are clobbered in
seemingly simple assembly routines. This means that some
callers needed to save/restore extra registers.
- The stack pointer must have space for a 'fake' return address
in idle, to avoid stack underflow.
254 lines
6.6 KiB
C
254 lines
6.6 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 1.4 1997/09/07 22:01:39 fsmp Exp $
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*/
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#ifndef _MACHINE_LOCK_H_
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#define _MACHINE_LOCK_H_
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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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* cml
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* cil
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* ipending
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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_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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#ifdef USE_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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#else
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#define MPINTR_LOCK()
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#define MPINTR_UNLOCK()
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#endif /* USE_MPINTRLOCK */
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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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* sio/cy lock.
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* XXX should rc (RISCom/8) use this?
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*/
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#ifdef USE_COMLOCK
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#define COM_LOCK() s_lock(&com_lock)
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#define COM_UNLOCK() s_unlock(&com_lock)
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#define COM_DISABLE_INTR() \
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{ __asm __volatile("cli" : : : "memory"); COM_LOCK(); }
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#define COM_ENABLE_INTR() \
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{ COM_UNLOCK(); __asm __volatile("sti"); }
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#else
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#define COM_LOCK()
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#define COM_UNLOCK()
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#define COM_DISABLE_INTR() disable_intr()
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#define COM_ENABLE_INTR() enable_intr()
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#endif /* USE_COMLOCK */
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/*
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* Clock hardware/struct lock.
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* XXX pcaudio and friends still need this lock installed.
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*/
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#ifdef USE_CLOCKLOCK
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#define CLOCK_LOCK() s_lock(&clock_lock)
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#define CLOCK_UNLOCK() s_unlock(&clock_lock)
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#define CLOCK_DISABLE_INTR() \
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{ __asm __volatile("cli" : : : "memory"); CLOCK_LOCK(); }
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#define CLOCK_ENABLE_INTR() \
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{ CLOCK_UNLOCK(); __asm __volatile("sti"); }
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#else
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#define CLOCK_LOCK()
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#define CLOCK_UNLOCK()
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#define CLOCK_DISABLE_INTR() disable_intr()
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#define CLOCK_ENABLE_INTR() enable_intr()
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#endif /* USE_CLOCKLOCK */
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#else /* SMP */
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#define MPINTR_LOCK()
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#define MPINTR_UNLOCK()
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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 COM_LOCK()
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#define COM_UNLOCK()
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#define CLOCK_LOCK()
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#define CLOCK_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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void s_lock_np __P((struct simplelock *));
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void s_unlock_np __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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extern struct simplelock mpintr_lock;
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extern struct simplelock mcount_lock;
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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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