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Annotation of sys/arch/sh/include/lock.h, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: lock.h,v 1.1.1.1 2006/10/06 21:02:55 miod Exp $       */
                      2: /*     $NetBSD: lock.h,v 1.10 2006/01/03 01:29:46 uwe Exp $    */
                      3:
                      4: /*-
                      5:  * Copyright (c) 2002 The NetBSD Foundation, Inc.
                      6:  * All rights reserved.
                      7:  *
                      8:  * This code is derived from software contributed to The NetBSD Foundation
                      9:  * by Gregory McGarry.
                     10:  *
                     11:  * Redistribution and use in source and binary forms, with or without
                     12:  * modification, are permitted provided that the following conditions
                     13:  * are met:
                     14:  * 1. Redistributions of source code must retain the above copyright
                     15:  *    notice, this list of conditions and the following disclaimer.
                     16:  * 2. Redistributions in binary form must reproduce the above copyright
                     17:  *    notice, this list of conditions and the following disclaimer in the
                     18:  *    documentation and/or other materials provided with the distribution.
                     19:  * 3. All advertising materials mentioning features or use of this software
                     20:  *    must display the following acknowledgement:
                     21:  *     This product includes software developed by the NetBSD
                     22:  *     Foundation, Inc. and its contributors.
                     23:  * 4. Neither the name of The NetBSD Foundation nor the names of its
                     24:  *    contributors may be used to endorse or promote products derived
                     25:  *    from this software without specific prior written permission.
                     26:  *
                     27:  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
                     28:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
                     29:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
                     30:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
                     31:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
                     32:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
                     33:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
                     34:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
                     35:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
                     36:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
                     37:  * POSSIBILITY OF SUCH DAMAGE.
                     38:  */
                     39:
                     40: /*
                     41:  * Machine-dependent spin lock operations.
                     42:  */
                     43:
                     44: #ifndef _SH_LOCK_H_
                     45: #define        _SH_LOCK_H_
                     46:
                     47: typedef volatile u_int8_t __cpu_simple_lock_t;
                     48:
                     49: #define        __SIMPLELOCK_LOCKED     0x80
                     50: #define        __SIMPLELOCK_UNLOCKED   0x00
                     51:
                     52: static __inline void
                     53: __cpu_simple_lock_init(__cpu_simple_lock_t *alp)
                     54: {
                     55:        *alp = __SIMPLELOCK_UNLOCKED;
                     56: }
                     57:
                     58: static __inline void
                     59: __cpu_simple_lock(__cpu_simple_lock_t *alp)
                     60: {
                     61:         __asm volatile(
                     62:                "1:     tas.b   %0      \n"
                     63:                "       bf      1b      \n"
                     64:                : "=m" (*alp));
                     65: }
                     66:
                     67: static __inline int
                     68: __cpu_simple_lock_try(__cpu_simple_lock_t *alp)
                     69: {
                     70:        int __rv;
                     71:
                     72:        __asm volatile(
                     73:                "       tas.b   %0      \n"
                     74:                "       mov     #0, %1  \n"
                     75:                "       rotcl   %1      \n"
                     76:                : "=m" (*alp), "=r" (__rv));
                     77:
                     78:        return (__rv);
                     79: }
                     80:
                     81: static __inline void
                     82: __cpu_simple_unlock(__cpu_simple_lock_t *alp)
                     83: {
                     84:        *alp = __SIMPLELOCK_UNLOCKED;
                     85: }
                     86:
                     87: #endif /* !_SH_LOCK_H_ */