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Annotation of sys/arch/m88k/include/lock.h, Revision 1.1.1.1

1.1       nbrk        1: #ifndef        _M88K_LOCK_H_
                      2: #define        _M88K_LOCK_H_
                      3: /*     $OpenBSD: lock.h,v 1.3 2007/05/19 16:58:43 miod Exp $   */
                      4:
                      5: /*
                      6:  * Copyright (c) 2005, Miodrag Vallat.
                      7:  *
                      8:  * Redistribution and use in source and binary forms, with or without
                      9:  * modification, are permitted provided that the following conditions
                     10:  * are met:
                     11:  * 1. Redistributions of source code must retain the above copyright
                     12:  *    notice, this list of conditions and the following disclaimer.
                     13:  * 2. Redistributions in binary form must reproduce the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer in the
                     15:  *    documentation and/or other materials provided with the distribution.
                     16:  *
                     17:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
                     18:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
                     19:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
                     20:  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
                     21:  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
                     22:  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
                     23:  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     24:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
                     25:  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
                     26:  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
                     27:  * POSSIBILITY OF SUCH DAMAGE.
                     28:  */
                     29:
                     30: #include <m88k/asm.h>
                     31:
                     32: typedef volatile u_int __cpu_simple_lock_t;
                     33:
                     34: /* do not change these - code below assumes r0 == __SIMPLELOCK_UNLOCKED */
                     35: #define        __SIMPLELOCK_LOCKED     1
                     36: #define        __SIMPLELOCK_UNLOCKED   0
                     37:
                     38: static __inline__ void
                     39: __cpu_simple_lock_init(__cpu_simple_lock_t *l)
                     40: {
                     41:        *l = __SIMPLELOCK_UNLOCKED;
                     42: }
                     43:
                     44: static __inline__ void
                     45: __cpu_simple_lock(__cpu_simple_lock_t *l)
                     46: {
                     47:        __cpu_simple_lock_t old;
                     48:
                     49:        do {
                     50:                old = __SIMPLELOCK_LOCKED;
                     51:                __asm__ __volatile__
                     52:                    ("xmem %0, %1, r0" : "+r" (old) : "r" (l));
                     53:        } while (old != __SIMPLELOCK_UNLOCKED);
                     54: }
                     55:
                     56: static __inline__ int
                     57: __cpu_simple_lock_try(__cpu_simple_lock_t *l)
                     58: {
                     59:        __cpu_simple_lock_t old = __SIMPLELOCK_LOCKED;
                     60:
                     61:        __asm__ __volatile__
                     62:            ("xmem %0, %1, r0" : "+r" (old) : "r" (l));
                     63:
                     64:        return (old == __SIMPLELOCK_UNLOCKED);
                     65: }
                     66:
                     67: static __inline__ void
                     68: __cpu_simple_unlock(__cpu_simple_lock_t *l)
                     69: {
                     70:        *l = __SIMPLELOCK_UNLOCKED;
                     71: }
                     72:
                     73: #endif /* _M88K_LOCK_H_ */