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Annotation of src/sys/arch/powerpc/include/lock.h, Revision 1.4.26.2

1.4.26.1  skrll       1: /*     $NetBSD: lock.h,v 1.5 2003/09/26 22:46:01 nathanw Exp $ */
1.1       thorpej     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:
                     43: #ifndef _POWERPC_LOCK_H_
1.3       tsubai     44: #define _POWERPC_LOCK_H_
1.2       thorpej    45:
1.3       tsubai     46: static __inline void
                     47: __cpu_simple_lock_init(__cpu_simple_lock_t *alp)
                     48: {
                     49:        *alp = __SIMPLELOCK_UNLOCKED;
                     50:        __asm __volatile ("sync");
                     51: }
                     52:
                     53: static __inline void
                     54: __cpu_simple_lock(__cpu_simple_lock_t *alp)
                     55: {
                     56:        int old;
                     57:
1.4       tsubai     58:        __asm __volatile ("     \
1.3       tsubai     59:                                \n\
                     60: 1:     lwarx   %0,0,%1         \n\
                     61:        cmpwi   %0,%2           \n\
                     62:        beq+    3f              \n\
1.4       tsubai     63: 2:     lwzx    %0,0,%1         \n\
1.3       tsubai     64:        cmpwi   %0,%2           \n\
                     65:        beq+    1b              \n\
                     66:        b       2b              \n\
                     67: 3:     stwcx.  %3,0,%1         \n\
                     68:        bne-    1b              \n\
                     69:        isync                   \n\
                     70:                                \n"
                     71:        : "=&r"(old)
                     72:        : "r"(alp), "I"(__SIMPLELOCK_UNLOCKED), "r"(__SIMPLELOCK_LOCKED)
                     73:        : "memory");
                     74: }
                     75:
                     76: static __inline int
                     77: __cpu_simple_lock_try(__cpu_simple_lock_t *alp)
                     78: {
1.4       tsubai     79:        int old, dummy;
1.3       tsubai     80:
1.4       tsubai     81:        __asm __volatile ("     \
1.3       tsubai     82:                                \n\
                     83: 1:     lwarx   %0,0,%1         \n\
                     84:        cmpwi   %0,%2           \n\
                     85:        bne     2f              \n\
                     86:        stwcx.  %3,0,%1         \n\
                     87:        bne-    1b              \n\
1.4       tsubai     88: 2:     stwcx.  %3,0,%4         \n\
1.3       tsubai     89:        isync                   \n\
1.4       tsubai     90:                                \n"
1.3       tsubai     91:        : "=&r"(old)
1.4       tsubai     92:        : "r"(alp), "I"(__SIMPLELOCK_UNLOCKED), "r"(__SIMPLELOCK_LOCKED),
                     93:          "r"(&dummy)
1.3       tsubai     94:        : "memory");
                     95:
                     96:        return (old == __SIMPLELOCK_UNLOCKED);
                     97: }
                     98:
                     99: static __inline void
                    100: __cpu_simple_unlock(__cpu_simple_lock_t *alp)
                    101: {
                    102:        __asm __volatile ("sync");
                    103:        *alp = __SIMPLELOCK_UNLOCKED;
                    104: }
1.1       thorpej   105:
                    106: #endif /* _POWERPC_LOCK_H_ */