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Annotation of src/sys/arch/powerpc/include/lock.h, Revision 1.12.44.1

1.12.44.1! jdolecek    1: /*     $NetBSD$        */
1.1       thorpej     2:
                      3: /*-
1.9       ad          4:  * Copyright (c) 2000, 2007 The NetBSD Foundation, Inc.
1.1       thorpej     5:  * All rights reserved.
                      6:  *
                      7:  * This code is derived from software contributed to The NetBSD Foundation
1.9       ad          8:  * by Jason R. Thorpe and Andrew Doran.
1.1       thorpej     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:  *
                     19:  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
                     20:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
                     21:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
                     22:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
                     23:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
                     24:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
                     25:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
                     26:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
                     27:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
                     28:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
                     29:  * POSSIBILITY OF SUCH DAMAGE.
                     30:  */
                     31:
                     32: /*
                     33:  * Machine-dependent spin lock operations.
                     34:  */
                     35:
                     36: #ifndef _POWERPC_LOCK_H_
1.3       tsubai     37: #define _POWERPC_LOCK_H_
                     38:
1.10      skrll      39: static __inline int
1.12.44.1! jdolecek   40: __SIMPLELOCK_LOCKED_P(const __cpu_simple_lock_t *__ptr)
1.10      skrll      41: {
                     42:        return *__ptr == __SIMPLELOCK_LOCKED;
                     43: }
                     44:
                     45: static __inline int
1.12.44.1! jdolecek   46: __SIMPLELOCK_UNLOCKED_P(const __cpu_simple_lock_t *__ptr)
1.10      skrll      47: {
                     48:        return *__ptr == __SIMPLELOCK_UNLOCKED;
                     49: }
                     50:
                     51: static __inline void
                     52: __cpu_simple_lock_clear(__cpu_simple_lock_t *__ptr)
                     53: {
                     54:        *__ptr = __SIMPLELOCK_UNLOCKED;
                     55: }
                     56:
                     57: static __inline void
                     58: __cpu_simple_lock_set(__cpu_simple_lock_t *__ptr)
                     59: {
                     60:        *__ptr = __SIMPLELOCK_LOCKED;
                     61: }
                     62:
1.8       perry      63: static __inline void
1.3       tsubai     64: __cpu_simple_lock_init(__cpu_simple_lock_t *alp)
                     65: {
                     66:        *alp = __SIMPLELOCK_UNLOCKED;
1.7       perry      67:        __asm volatile ("sync");
1.3       tsubai     68: }
                     69:
1.8       perry      70: static __inline void
1.3       tsubai     71: __cpu_simple_lock(__cpu_simple_lock_t *alp)
                     72: {
                     73:        int old;
                     74:
1.7       perry      75:        __asm volatile ("       \
1.3       tsubai     76:                                \n\
                     77: 1:     lwarx   %0,0,%1         \n\
                     78:        cmpwi   %0,%2           \n\
                     79:        beq+    3f              \n\
1.4       tsubai     80: 2:     lwzx    %0,0,%1         \n\
1.3       tsubai     81:        cmpwi   %0,%2           \n\
                     82:        beq+    1b              \n\
                     83:        b       2b              \n\
                     84: 3:     stwcx.  %3,0,%1         \n\
                     85:        bne-    1b              \n\
                     86:        isync                   \n\
                     87:                                \n"
                     88:        : "=&r"(old)
                     89:        : "r"(alp), "I"(__SIMPLELOCK_UNLOCKED), "r"(__SIMPLELOCK_LOCKED)
                     90:        : "memory");
                     91: }
                     92:
1.8       perry      93: static __inline int
1.3       tsubai     94: __cpu_simple_lock_try(__cpu_simple_lock_t *alp)
                     95: {
1.4       tsubai     96:        int old, dummy;
1.3       tsubai     97:
1.7       perry      98:        __asm volatile ("       \
1.3       tsubai     99:                                \n\
                    100: 1:     lwarx   %0,0,%1         \n\
                    101:        cmpwi   %0,%2           \n\
                    102:        bne     2f              \n\
                    103:        stwcx.  %3,0,%1         \n\
                    104:        bne-    1b              \n\
1.4       tsubai    105: 2:     stwcx.  %3,0,%4         \n\
1.3       tsubai    106:        isync                   \n\
1.4       tsubai    107:                                \n"
1.3       tsubai    108:        : "=&r"(old)
1.4       tsubai    109:        : "r"(alp), "I"(__SIMPLELOCK_UNLOCKED), "r"(__SIMPLELOCK_LOCKED),
                    110:          "r"(&dummy)
1.3       tsubai    111:        : "memory");
                    112:
                    113:        return (old == __SIMPLELOCK_UNLOCKED);
                    114: }
                    115:
1.8       perry     116: static __inline void
1.3       tsubai    117: __cpu_simple_unlock(__cpu_simple_lock_t *alp)
                    118: {
1.7       perry     119:        __asm volatile ("sync");
1.3       tsubai    120:        *alp = __SIMPLELOCK_UNLOCKED;
                    121: }
1.1       thorpej   122:
1.9       ad        123: static __inline void
                    124: mb_read(void)
                    125: {
                    126:        __asm volatile ("isync" ::: "memory");
                    127: }
                    128:
                    129: static __inline void
                    130: mb_write(void)
                    131: {
                    132:        __asm volatile ("sync" ::: "memory");
                    133: }
                    134:
                    135: static __inline void
                    136: mb_memory(void)
                    137: {
                    138:        __asm volatile ("sync" ::: "memory");
                    139: }
                    140:
1.1       thorpej   141: #endif /* _POWERPC_LOCK_H_ */

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