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Annotation of sys/arch/powerpc/include/lock.h, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: lock.h,v 1.1 2007/03/20 20:59:53 kettenis Exp $       */
        !             2: /*     $NetBSD: lock.h,v 1.8 2005/12/28 19:09:29 perry Exp $   */
        !             3:
        !             4: /*-
        !             5:  * Copyright (c) 2000 The NetBSD Foundation, Inc.
        !             6:  * All rights reserved.
        !             7:  *
        !             8:  * This code is derived from software contributed to The NetBSD Foundation
        !             9:  * by Jason R. Thorpe.
        !            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 _POWERPC_LOCK_H_
        !            45: #define _POWERPC_LOCK_H_
        !            46:
        !            47: typedef __volatile int          __cpu_simple_lock_t;
        !            48:
        !            49: #define __SIMPLELOCK_LOCKED     1
        !            50: #define __SIMPLELOCK_UNLOCKED   0
        !            51:
        !            52: static __inline void
        !            53: __cpu_simple_lock_init(__cpu_simple_lock_t *alp)
        !            54: {
        !            55:        *alp = __SIMPLELOCK_UNLOCKED;
        !            56:        __asm volatile ("sync");
        !            57: }
        !            58:
        !            59: static __inline void
        !            60: __cpu_simple_lock(__cpu_simple_lock_t *alp)
        !            61: {
        !            62:        int old;
        !            63:
        !            64:        __asm volatile ("       \
        !            65:                                \n\
        !            66: 1:     lwarx   %0,0,%1         \n\
        !            67:        cmpwi   %0,%2           \n\
        !            68:        beq+    3f              \n\
        !            69: 2:     lwzx    %0,0,%1         \n\
        !            70:        cmpwi   %0,%2           \n\
        !            71:        beq+    1b              \n\
        !            72:        b       2b              \n\
        !            73: 3:     stwcx.  %3,0,%1         \n\
        !            74:        bne-    1b              \n\
        !            75:        isync                   \n\
        !            76:                                \n"
        !            77:        : "=&r"(old)
        !            78:        : "r"(alp), "I"(__SIMPLELOCK_UNLOCKED), "r"(__SIMPLELOCK_LOCKED)
        !            79:        : "memory");
        !            80: }
        !            81:
        !            82: static __inline int
        !            83: __cpu_simple_lock_try(__cpu_simple_lock_t *alp)
        !            84: {
        !            85:        int old, dummy;
        !            86:
        !            87:        __asm volatile ("       \
        !            88:                                \n\
        !            89: 1:     lwarx   %0,0,%1         \n\
        !            90:        cmpwi   %0,%2           \n\
        !            91:        bne     2f              \n\
        !            92:        stwcx.  %3,0,%1         \n\
        !            93:        bne-    1b              \n\
        !            94: 2:     stwcx.  %3,0,%4         \n\
        !            95:        isync                   \n\
        !            96:                                \n"
        !            97:        : "=&r"(old)
        !            98:        : "r"(alp), "I"(__SIMPLELOCK_UNLOCKED), "r"(__SIMPLELOCK_LOCKED),
        !            99:          "r"(&dummy)
        !           100:        : "memory");
        !           101:
        !           102:        return (old == __SIMPLELOCK_UNLOCKED);
        !           103: }
        !           104:
        !           105: static __inline void
        !           106: __cpu_simple_unlock(__cpu_simple_lock_t *alp)
        !           107: {
        !           108:        __asm volatile ("sync");
        !           109:        *alp = __SIMPLELOCK_UNLOCKED;
        !           110: }
        !           111:
        !           112: #endif /* _POWERPC_LOCK_H_ */