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Annotation of src/sys/arch/x86/include/lock.h, Revision 1.8.4.1

1.8.4.1 ! kent        1: /*     $NetBSD: lock.h,v 1.9 2005/04/16 07:45:59 yamt Exp $    */
1.1       fvdl        2:
                      3: /*-
                      4:  * Copyright (c) 2000 The NetBSD Foundation, Inc.
                      5:  * All rights reserved.
                      6:  *
                      7:  * This code is derived from software contributed to The NetBSD Foundation
                      8:  * by Jason R. Thorpe.
                      9:  *
                     10:  * Redistribution and use in source and binary forms, with or without
                     11:  * modification, are permitted provided that the following conditions
                     12:  * are met:
                     13:  * 1. Redistributions of source code must retain the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer.
                     15:  * 2. Redistributions in binary form must reproduce the above copyright
                     16:  *    notice, this list of conditions and the following disclaimer in the
                     17:  *    documentation and/or other materials provided with the distribution.
                     18:  * 3. All advertising materials mentioning features or use of this software
                     19:  *    must display the following acknowledgement:
                     20:  *     This product includes software developed by the NetBSD
                     21:  *     Foundation, Inc. and its contributors.
                     22:  * 4. Neither the name of The NetBSD Foundation nor the names of its
                     23:  *    contributors may be used to endorse or promote products derived
                     24:  *    from this software without specific prior written permission.
                     25:  *
                     26:  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
                     27:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
                     28:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
                     29:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
                     30:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
                     31:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
                     32:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
                     33:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
                     34:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
                     35:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
                     36:  * POSSIBILITY OF SUCH DAMAGE.
                     37:  */
                     38:
                     39: /*
                     40:  * Machine-dependent spin lock operations.
                     41:  */
                     42:
1.8.4.1 ! kent       43: #ifndef _X86_LOCK_H_
        !            44: #define        _X86_LOCK_H_
1.1       fvdl       45:
                     46: #if defined(_KERNEL_OPT)
                     47: #include "opt_lockdebug.h"
                     48: #endif
                     49:
1.2       fvdl       50: #include <machine/cpufunc.h>
1.1       fvdl       51:
                     52: #ifdef LOCKDEBUG
                     53:
1.5       junyoung   54: extern void __cpu_simple_lock_init(__cpu_simple_lock_t *);
                     55: extern void __cpu_simple_lock(__cpu_simple_lock_t *);
                     56: extern int __cpu_simple_lock_try(__cpu_simple_lock_t *);
                     57: extern void __cpu_simple_unlock(__cpu_simple_lock_t *);
1.1       fvdl       58:
                     59: #else
                     60:
                     61: #include <machine/atomic.h>
                     62:
1.5       junyoung   63: static __inline void __cpu_simple_lock_init(__cpu_simple_lock_t *)
1.1       fvdl       64:        __attribute__((__unused__));
1.5       junyoung   65: static __inline void __cpu_simple_lock(__cpu_simple_lock_t *)
1.1       fvdl       66:        __attribute__((__unused__));
1.5       junyoung   67: static __inline int __cpu_simple_lock_try(__cpu_simple_lock_t *)
1.1       fvdl       68:        __attribute__((__unused__));
1.5       junyoung   69: static __inline void __cpu_simple_unlock(__cpu_simple_lock_t *)
1.1       fvdl       70:        __attribute__((__unused__));
                     71:
                     72: static __inline void
                     73: __cpu_simple_lock_init(__cpu_simple_lock_t *lockp)
                     74: {
                     75:
                     76:        *lockp = __SIMPLELOCK_UNLOCKED;
1.7       yamt       77:        __insn_barrier();
1.1       fvdl       78: }
                     79:
                     80: static __inline void
                     81: __cpu_simple_lock(__cpu_simple_lock_t *lockp)
                     82: {
                     83:
                     84:        while (x86_atomic_testset_i(lockp, __SIMPLELOCK_LOCKED)
1.6       yamt       85:            != __SIMPLELOCK_UNLOCKED) {
                     86:                do {
                     87:                        x86_pause();
                     88:                } while (*lockp == __SIMPLELOCK_LOCKED);
                     89:        }
1.7       yamt       90:        __insn_barrier();
1.1       fvdl       91: }
                     92:
                     93: static __inline int
                     94: __cpu_simple_lock_try(__cpu_simple_lock_t *lockp)
                     95: {
                     96:        int r = (x86_atomic_testset_i(lockp, __SIMPLELOCK_LOCKED)
                     97:            == __SIMPLELOCK_UNLOCKED);
                     98:
1.7       yamt       99:        __insn_barrier();
1.1       fvdl      100:
                    101:        return (r);
                    102: }
                    103:
                    104: static __inline void
                    105: __cpu_simple_unlock(__cpu_simple_lock_t *lockp)
                    106: {
                    107:
1.7       yamt      108:        __insn_barrier();
1.1       fvdl      109:        *lockp = __SIMPLELOCK_UNLOCKED;
                    110: }
                    111:
                    112: #endif /* !LOCKDEBUG */
1.4       yamt      113:
                    114: #ifdef _KERNEL
                    115: #define        SPINLOCK_SPIN_HOOK      x86_pause()
                    116: #endif
1.1       fvdl      117:
1.8.4.1 ! kent      118: #endif /* _X86_LOCK_H_ */

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