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freebsd-dev/sys/i386/include/lock.h

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Another round of lock pushdown. 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>
1997-08-30 08:08:10 +00:00
/*
* 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.
*
$Id$ -> $FreeBSD$
1999-08-28 01:08:13 +00:00
* $FreeBSD$
Another round of lock pushdown. 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>
1997-08-30 08:08:10 +00:00
*/
#ifndef _MACHINE_LOCK_H_
#define _MACHINE_LOCK_H_
#ifdef LOCORE
#ifdef SMP
#define MPLOCKED lock ;
/*
* Protects the IO APIC and apic_imen as a critical region.
*/
Convert all simplelocks to mutexes and remove the simplelock implementations.
2001-01-24 12:35:55 +00:00
#define IMASK_LOCK MTX_ENTER(_imen_mtx, MTX_SPIN)
#define IMASK_UNLOCK MTX_EXIT(_imen_mtx, MTX_SPIN)
Another round of lock pushdown. 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>
1997-08-30 08:08:10 +00:00
#else /* SMP */
#define MPLOCKED /* NOP */
Major update to the way synchronization is done in the kernel. Highlights include: * Mutual exclusion is used instead of spl*(). See mutex(9). (Note: The alpha port is still in transition and currently uses both.) * Per-CPU idle processes. * Interrupts are run in their own separate kernel threads and can be preempted (i386 only). Partially contributed by: BSDi (BSD/OS) Submissions by (at least): cp, dfr, dillon, grog, jake, jhb, sheldonh
2000-09-07 01:33:02 +00:00
#define IMASK_LOCK /* NOP */
#define IMASK_UNLOCK /* NOP */
Another round of lock pushdown. 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>
1997-08-30 08:08:10 +00:00
#endif /* SMP */
#else /* LOCORE */
#ifdef SMP
General cleanup of the sub-system locking macros. Eliminated the RECURSIVE_MPINTRLOCK. clock.c and microtime use clock_lock. sio.c and cy.c use com_lock. Suggestions by: Bruce Evans <bde@zeta.org.au>
1997-09-01 07:45:37 +00:00
#include <machine/smptests.h> /** xxx_LOCK */
General cleanup of the lock pushdown code. They are grouped and enabled from machine/smptests.h: #define PUSHDOWN_LEVEL_1 #define PUSHDOWN_LEVEL_2 #define PUSHDOWN_LEVEL_3 #define PUSHDOWN_LEVEL_4_NOT
1997-09-07 22:04:09 +00:00
/*
* sio/cy lock.
* XXX should rc (RISCom/8) use this?
*/
General cleanup of the sub-system locking macros. Eliminated the RECURSIVE_MPINTRLOCK. clock.c and microtime use clock_lock. sio.c and cy.c use com_lock. Suggestions by: Bruce Evans <bde@zeta.org.au>
1997-09-01 07:45:37 +00:00
#ifdef USE_COMLOCK
Convert all simplelocks to mutexes and remove the simplelock implementations.
2001-01-24 12:35:55 +00:00
#define COM_LOCK() mtx_enter(&com_mtx, MTX_SPIN)
#define COM_UNLOCK() mtx_exit(&com_mtx, MTX_SPIN)
General cleanup of the sub-system locking macros. Eliminated the RECURSIVE_MPINTRLOCK. clock.c and microtime use clock_lock. sio.c and cy.c use com_lock. Suggestions by: Bruce Evans <bde@zeta.org.au>
1997-09-01 07:45:37 +00:00
#else
#define COM_LOCK()
#define COM_UNLOCK()
#endif /* USE_COMLOCK */
Another round of lock pushdown. 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>
1997-08-30 08:08:10 +00:00
#else /* SMP */
General cleanup of the sub-system locking macros. Eliminated the RECURSIVE_MPINTRLOCK. clock.c and microtime use clock_lock. sio.c and cy.c use com_lock. Suggestions by: Bruce Evans <bde@zeta.org.au>
1997-09-01 07:45:37 +00:00
#define COM_LOCK()
#define COM_UNLOCK()
Another round of lock pushdown. 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>
1997-08-30 08:08:10 +00:00
#endif /* SMP */
/* global data in mp_machdep.c */
Convert all simplelocks to mutexes and remove the simplelock implementations.
2001-01-24 12:35:55 +00:00
extern struct mtx imen_mtx;
extern struct mtx com_mtx;
extern struct mtx mcount_mtx;
extern struct mtx panic_mtx;
Another round of lock pushdown. 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>
1997-08-30 08:08:10 +00:00
#endif /* LOCORE */
#endif /* !_MACHINE_LOCK_H_ */
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