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lock.h revision 1.11.20.1
      1  1.11.20.1        ad /*	$NetBSD: lock.h,v 1.11.20.1 2006/10/20 19:30:31 ad Exp $	*/
      2        1.1      fvdl 
      3        1.1      fvdl /*-
      4  1.11.20.1        ad  * Copyright (c) 2000, 2006 The NetBSD Foundation, Inc.
      5        1.1      fvdl  * All rights reserved.
      6        1.1      fvdl  *
      7        1.1      fvdl  * This code is derived from software contributed to The NetBSD Foundation
      8  1.11.20.1        ad  * by Jason R. Thorpe and Andrew Doran.
      9        1.1      fvdl  *
     10        1.1      fvdl  * Redistribution and use in source and binary forms, with or without
     11        1.1      fvdl  * modification, are permitted provided that the following conditions
     12        1.1      fvdl  * are met:
     13        1.1      fvdl  * 1. Redistributions of source code must retain the above copyright
     14        1.1      fvdl  *    notice, this list of conditions and the following disclaimer.
     15        1.1      fvdl  * 2. Redistributions in binary form must reproduce the above copyright
     16        1.1      fvdl  *    notice, this list of conditions and the following disclaimer in the
     17        1.1      fvdl  *    documentation and/or other materials provided with the distribution.
     18        1.1      fvdl  * 3. All advertising materials mentioning features or use of this software
     19        1.1      fvdl  *    must display the following acknowledgement:
     20        1.1      fvdl  *	This product includes software developed by the NetBSD
     21        1.1      fvdl  *	Foundation, Inc. and its contributors.
     22        1.1      fvdl  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23        1.1      fvdl  *    contributors may be used to endorse or promote products derived
     24        1.1      fvdl  *    from this software without specific prior written permission.
     25        1.1      fvdl  *
     26        1.1      fvdl  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27        1.1      fvdl  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28        1.1      fvdl  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29        1.1      fvdl  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30        1.1      fvdl  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31        1.1      fvdl  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32        1.1      fvdl  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33        1.1      fvdl  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34        1.1      fvdl  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35        1.1      fvdl  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36        1.1      fvdl  * POSSIBILITY OF SUCH DAMAGE.
     37        1.1      fvdl  */
     38        1.1      fvdl 
     39        1.1      fvdl /*
     40        1.1      fvdl  * Machine-dependent spin lock operations.
     41        1.1      fvdl  */
     42        1.1      fvdl 
     43        1.9      yamt #ifndef _X86_LOCK_H_
     44        1.9      yamt #define	_X86_LOCK_H_
     45        1.1      fvdl 
     46        1.1      fvdl #if defined(_KERNEL_OPT)
     47        1.1      fvdl #include "opt_lockdebug.h"
     48        1.1      fvdl #endif
     49        1.1      fvdl 
     50        1.2      fvdl #include <machine/cpufunc.h>
     51        1.1      fvdl 
     52        1.1      fvdl #ifdef LOCKDEBUG
     53        1.1      fvdl 
     54        1.5  junyoung extern void __cpu_simple_lock_init(__cpu_simple_lock_t *);
     55        1.5  junyoung extern void __cpu_simple_lock(__cpu_simple_lock_t *);
     56        1.5  junyoung extern int __cpu_simple_lock_try(__cpu_simple_lock_t *);
     57        1.5  junyoung extern void __cpu_simple_unlock(__cpu_simple_lock_t *);
     58        1.1      fvdl 
     59        1.1      fvdl #else
     60        1.1      fvdl 
     61        1.1      fvdl #include <machine/atomic.h>
     62        1.1      fvdl 
     63       1.11     perry static __inline void __cpu_simple_lock_init(__cpu_simple_lock_t *)
     64        1.1      fvdl 	__attribute__((__unused__));
     65       1.11     perry static __inline void __cpu_simple_lock(__cpu_simple_lock_t *)
     66        1.1      fvdl 	__attribute__((__unused__));
     67       1.11     perry static __inline int __cpu_simple_lock_try(__cpu_simple_lock_t *)
     68        1.1      fvdl 	__attribute__((__unused__));
     69       1.11     perry static __inline void __cpu_simple_unlock(__cpu_simple_lock_t *)
     70        1.1      fvdl 	__attribute__((__unused__));
     71        1.1      fvdl 
     72       1.11     perry static __inline void
     73        1.1      fvdl __cpu_simple_lock_init(__cpu_simple_lock_t *lockp)
     74        1.1      fvdl {
     75        1.1      fvdl 
     76        1.1      fvdl 	*lockp = __SIMPLELOCK_UNLOCKED;
     77        1.7      yamt 	__insn_barrier();
     78        1.1      fvdl }
     79        1.1      fvdl 
     80       1.11     perry static __inline void
     81        1.1      fvdl __cpu_simple_lock(__cpu_simple_lock_t *lockp)
     82        1.1      fvdl {
     83        1.1      fvdl 
     84        1.1      fvdl 	while (x86_atomic_testset_i(lockp, __SIMPLELOCK_LOCKED)
     85        1.6      yamt 	    != __SIMPLELOCK_UNLOCKED) {
     86        1.6      yamt 		do {
     87        1.6      yamt 			x86_pause();
     88        1.6      yamt 		} while (*lockp == __SIMPLELOCK_LOCKED);
     89        1.6      yamt 	}
     90        1.7      yamt 	__insn_barrier();
     91        1.1      fvdl }
     92        1.1      fvdl 
     93       1.11     perry static __inline int
     94        1.1      fvdl __cpu_simple_lock_try(__cpu_simple_lock_t *lockp)
     95        1.1      fvdl {
     96        1.1      fvdl 	int r = (x86_atomic_testset_i(lockp, __SIMPLELOCK_LOCKED)
     97        1.1      fvdl 	    == __SIMPLELOCK_UNLOCKED);
     98        1.1      fvdl 
     99        1.7      yamt 	__insn_barrier();
    100        1.1      fvdl 
    101        1.1      fvdl 	return (r);
    102        1.1      fvdl }
    103        1.1      fvdl 
    104       1.11     perry static __inline void
    105        1.1      fvdl __cpu_simple_unlock(__cpu_simple_lock_t *lockp)
    106        1.1      fvdl {
    107        1.1      fvdl 
    108        1.7      yamt 	__insn_barrier();
    109        1.1      fvdl 	*lockp = __SIMPLELOCK_UNLOCKED;
    110        1.1      fvdl }
    111        1.1      fvdl 
    112        1.1      fvdl #endif /* !LOCKDEBUG */
    113        1.4      yamt 
    114        1.4      yamt #ifdef _KERNEL
    115        1.4      yamt #define	SPINLOCK_SPIN_HOOK	x86_pause()
    116        1.4      yamt #endif
    117        1.1      fvdl 
    118  1.11.20.1        ad static inline void
    119  1.11.20.1        ad mb_read(void)
    120  1.11.20.1        ad {
    121  1.11.20.1        ad 	__insn_barrier();
    122  1.11.20.1        ad }
    123  1.11.20.1        ad 
    124  1.11.20.1        ad static inline void
    125  1.11.20.1        ad mb_write(void)
    126  1.11.20.1        ad {
    127  1.11.20.1        ad 	__insn_barrier();
    128  1.11.20.1        ad }
    129  1.11.20.1        ad 
    130  1.11.20.1        ad static inline void
    131  1.11.20.1        ad mb_memory(void)
    132  1.11.20.1        ad {
    133  1.11.20.1        ad 	__insn_barrier();
    134  1.11.20.1        ad }
    135  1.11.20.1        ad 
    136        1.9      yamt #endif /* _X86_LOCK_H_ */
    137