mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-22 11:17:19 +00:00
253 lines
6.5 KiB
C
253 lines
6.5 KiB
C
/*
|
|
* Copyright (c) 1997, by Steve Passe
|
|
* All rights reserved.
|
|
*
|
|
* 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. The name of the developer may NOT be used to endorse or promote products
|
|
* derived from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
|
|
*
|
|
* $Id: lock.h,v 1.5 1997/12/15 02:18:27 tegge Exp $
|
|
*/
|
|
|
|
|
|
#ifndef _MACHINE_LOCK_H_
|
|
#define _MACHINE_LOCK_H_
|
|
|
|
|
|
#ifdef LOCORE
|
|
|
|
#ifdef SMP
|
|
|
|
#define MPLOCKED lock ;
|
|
|
|
/*
|
|
* Some handy macros to allow logical organization and
|
|
* convenient reassignment of various locks.
|
|
*/
|
|
|
|
#define FPU_LOCK call _get_fpu_lock
|
|
#define ALIGN_LOCK call _get_align_lock
|
|
#define SYSCALL_LOCK call _get_syscall_lock
|
|
#define ALTSYSCALL_LOCK call _get_altsyscall_lock
|
|
|
|
/*
|
|
* Protects INTR() ISRs.
|
|
*/
|
|
#define ISR_TRYLOCK \
|
|
pushl $_mp_lock ; /* GIANT_LOCK */ \
|
|
call _MPtrylock ; /* try to get lock */ \
|
|
add $4, %esp
|
|
|
|
#define ISR_RELLOCK \
|
|
pushl $_mp_lock ; /* GIANT_LOCK */ \
|
|
call _MPrellock ; \
|
|
add $4, %esp
|
|
|
|
/*
|
|
* Protects the IO APIC and apic_imen as a critical region.
|
|
*/
|
|
#define IMASK_LOCK \
|
|
pushl $_imen_lock ; /* address of lock */ \
|
|
call _s_lock ; /* MP-safe */ \
|
|
addl $4, %esp
|
|
|
|
#define IMASK_UNLOCK \
|
|
pushl $_imen_lock ; /* address of lock */ \
|
|
call _s_unlock ; /* MP-safe */ \
|
|
addl $4, %esp
|
|
|
|
/*
|
|
* Variations of CPL_LOCK protect spl updates as a critical region.
|
|
* Items within this 'region' include:
|
|
* cpl
|
|
* cml
|
|
* cil
|
|
* ipending
|
|
*/
|
|
|
|
/*
|
|
* Botom half routines, ie. those already protected from INTs.
|
|
*
|
|
* Used in:
|
|
* sys/i386/isa/ipl.s: _doreti
|
|
* sys/i386/isa/apic_vector.s: _Xintr0, ..., _Xintr23
|
|
*/
|
|
#define CPL_LOCK \
|
|
pushl $_cpl_lock ; /* address of lock */ \
|
|
call _s_lock ; /* MP-safe */ \
|
|
addl $4, %esp
|
|
|
|
#define CPL_UNLOCK \
|
|
pushl $_cpl_lock ; /* address of lock */ \
|
|
call _s_unlock ; /* MP-safe */ \
|
|
addl $4, %esp
|
|
|
|
/*
|
|
* INT safe version for top half of kernel.
|
|
*
|
|
* Used in:
|
|
* sys/i386/i386/exception.s: _Xfpu, _Xalign, _Xsyscall, _Xint0x80_syscall
|
|
* sys/i386/isa/apic_ipl.s: splz()
|
|
*/
|
|
#define SCPL_LOCK \
|
|
pushl $_cpl_lock ; \
|
|
call _ss_lock ; \
|
|
addl $4, %esp
|
|
|
|
#define SCPL_UNLOCK \
|
|
pushl $_cpl_lock ; \
|
|
call _ss_unlock ; \
|
|
addl $4, %esp
|
|
|
|
#else /* SMP */
|
|
|
|
#define MPLOCKED /* NOP */
|
|
|
|
#define FPU_LOCK /* NOP */
|
|
#define ALIGN_LOCK /* NOP */
|
|
#define SYSCALL_LOCK /* NOP */
|
|
#define ALTSYSCALL_LOCK /* NOP */
|
|
|
|
#endif /* SMP */
|
|
|
|
#else /* LOCORE */
|
|
|
|
#ifdef SMP
|
|
|
|
#include <machine/smptests.h> /** xxx_LOCK */
|
|
|
|
/*
|
|
* Locks regions protected in UP kernel via cli/sti.
|
|
*/
|
|
#ifdef USE_MPINTRLOCK
|
|
#define MPINTR_LOCK() s_lock(&mpintr_lock)
|
|
#define MPINTR_UNLOCK() s_unlock(&mpintr_lock)
|
|
#else
|
|
#define MPINTR_LOCK()
|
|
#define MPINTR_UNLOCK()
|
|
#endif /* USE_MPINTRLOCK */
|
|
|
|
/*
|
|
* Protects cpl/cml/cil/ipending data as a critical region.
|
|
*
|
|
* Used in:
|
|
* sys/i386/isa/ipl_funcs.c: DO_SETBITS, softclockpending(), GENSPL,
|
|
* spl0(), splx(), splq()
|
|
*/
|
|
#define CPL_LOCK() s_lock(&cpl_lock) /* Bottom end */
|
|
#define CPL_UNLOCK() s_unlock(&cpl_lock)
|
|
#define SCPL_LOCK() ss_lock(&cpl_lock) /* INT safe: top end */
|
|
#define SCPL_UNLOCK() ss_unlock(&cpl_lock)
|
|
|
|
/*
|
|
* sio/cy lock.
|
|
* XXX should rc (RISCom/8) use this?
|
|
*/
|
|
#ifdef USE_COMLOCK
|
|
#define COM_LOCK() s_lock(&com_lock)
|
|
#define COM_UNLOCK() s_unlock(&com_lock)
|
|
#define COM_DISABLE_INTR() \
|
|
{ __asm __volatile("cli" : : : "memory"); COM_LOCK(); }
|
|
#define COM_ENABLE_INTR() \
|
|
{ COM_UNLOCK(); __asm __volatile("sti"); }
|
|
#else
|
|
#define COM_LOCK()
|
|
#define COM_UNLOCK()
|
|
#define COM_DISABLE_INTR() disable_intr()
|
|
#define COM_ENABLE_INTR() enable_intr()
|
|
#endif /* USE_COMLOCK */
|
|
|
|
/*
|
|
* Clock hardware/struct lock.
|
|
* XXX pcaudio and friends still need this lock installed.
|
|
*/
|
|
#ifdef USE_CLOCKLOCK
|
|
#define CLOCK_LOCK() s_lock(&clock_lock)
|
|
#define CLOCK_UNLOCK() s_unlock(&clock_lock)
|
|
#define CLOCK_DISABLE_INTR() \
|
|
{ __asm __volatile("cli" : : : "memory"); CLOCK_LOCK(); }
|
|
#define CLOCK_ENABLE_INTR() \
|
|
{ CLOCK_UNLOCK(); __asm __volatile("sti"); }
|
|
#else
|
|
#define CLOCK_LOCK()
|
|
#define CLOCK_UNLOCK()
|
|
#define CLOCK_DISABLE_INTR() disable_intr()
|
|
#define CLOCK_ENABLE_INTR() enable_intr()
|
|
#endif /* USE_CLOCKLOCK */
|
|
|
|
#else /* SMP */
|
|
|
|
#define MPINTR_LOCK()
|
|
#define MPINTR_UNLOCK()
|
|
|
|
#define CPL_LOCK()
|
|
#define CPL_UNLOCK()
|
|
#define SCPL_LOCK()
|
|
#define SCPL_UNLOCK()
|
|
|
|
#define COM_LOCK()
|
|
#define COM_UNLOCK()
|
|
#define CLOCK_LOCK()
|
|
#define CLOCK_UNLOCK()
|
|
|
|
#endif /* SMP */
|
|
|
|
/*
|
|
* Simple spin lock.
|
|
* It is an error to hold one of these locks while a process is sleeping.
|
|
*/
|
|
struct simplelock {
|
|
volatile int lock_data;
|
|
};
|
|
|
|
/* functions in simplelock.s */
|
|
void s_lock_init __P((struct simplelock *));
|
|
void s_lock __P((struct simplelock *));
|
|
int s_lock_try __P((struct simplelock *));
|
|
void s_unlock __P((struct simplelock *));
|
|
void ss_lock __P((struct simplelock *));
|
|
void ss_unlock __P((struct simplelock *));
|
|
void s_lock_np __P((struct simplelock *));
|
|
void s_unlock_np __P((struct simplelock *));
|
|
|
|
/* global data in mp_machdep.c */
|
|
extern struct simplelock imen_lock;
|
|
extern struct simplelock cpl_lock;
|
|
extern struct simplelock fast_intr_lock;
|
|
extern struct simplelock intr_lock;
|
|
extern struct simplelock clock_lock;
|
|
extern struct simplelock com_lock;
|
|
extern struct simplelock mpintr_lock;
|
|
extern struct simplelock mcount_lock;
|
|
|
|
#if !defined(SIMPLELOCK_DEBUG) && NCPUS > 1
|
|
/*
|
|
* This set of defines turns on the real functions in i386/isa/apic_ipl.s.
|
|
*/
|
|
#define simple_lock_init(alp) s_lock_init(alp)
|
|
#define simple_lock(alp) s_lock(alp)
|
|
#define simple_lock_try(alp) s_lock_try(alp)
|
|
#define simple_unlock(alp) s_unlock(alp)
|
|
|
|
#endif /* !SIMPLELOCK_DEBUG && NCPUS > 1 */
|
|
|
|
#endif /* LOCORE */
|
|
|
|
#endif /* !_MACHINE_LOCK_H_ */
|