1 /* $NetBSD: lock.h,v 1.17 2017/09/17 00:01:08 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 2002 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Gregory McGarry. 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 _SH3_LOCK_H_ 37 #define _SH3_LOCK_H_ 38 39 static __inline void __cpu_simple_lock_init(__cpu_simple_lock_t *) 40 __attribute__((__unused__)); 41 static __inline void __cpu_simple_lock(__cpu_simple_lock_t *) 42 __attribute__((__unused__)); 43 static __inline int __cpu_simple_lock_try(__cpu_simple_lock_t *) 44 __attribute__((__unused__)); 45 static __inline void __cpu_simple_unlock(__cpu_simple_lock_t *) 46 __attribute__((__unused__)); 47 48 static __inline int 49 __SIMPLELOCK_LOCKED_P(const __cpu_simple_lock_t *__ptr) 50 { 51 return *__ptr == __SIMPLELOCK_LOCKED; 52 } 53 54 static __inline int 55 __SIMPLELOCK_UNLOCKED_P(const __cpu_simple_lock_t *__ptr) 56 { 57 return *__ptr == __SIMPLELOCK_UNLOCKED; 58 } 59 60 static __inline void 61 __cpu_simple_lock_clear(__cpu_simple_lock_t *__ptr) 62 { 63 *__ptr = __SIMPLELOCK_UNLOCKED; 64 } 65 66 static __inline void 67 __cpu_simple_lock_set(__cpu_simple_lock_t *__ptr) 68 { 69 *__ptr = __SIMPLELOCK_LOCKED; 70 } 71 72 static __inline void 73 __cpu_simple_lock_init(__cpu_simple_lock_t *alp) 74 { 75 76 *alp = __SIMPLELOCK_UNLOCKED; 77 } 78 79 static __inline void 80 __cpu_simple_lock(__cpu_simple_lock_t *alp) 81 { 82 83 __asm volatile( 84 "1: tas.b @%0 \n" 85 " bf 1b \n" 86 : /* no outputs */ 87 : "r" (alp) 88 : "cc", "memory"); 89 } 90 91 static __inline int 92 __cpu_simple_lock_try(__cpu_simple_lock_t *alp) 93 { 94 int __rv; 95 96 __asm volatile( 97 " tas.b @%1 \n" 98 " movt %0 \n" 99 : "=r" (__rv) 100 : "r" (alp) 101 : "cc", "memory"); 102 103 return (__rv); 104 } 105 106 static __inline void 107 __cpu_simple_unlock(__cpu_simple_lock_t *alp) 108 { 109 110 *alp = __SIMPLELOCK_UNLOCKED; 111 } 112 113 static __inline void 114 mb_read(void) 115 { 116 __asm volatile("" : : : "memory"); 117 } 118 119 static __inline void 120 mb_write(void) 121 { 122 __asm volatile("" : : : "memory"); 123 } 124 125 static __inline void 126 mb_memory(void) 127 { 128 __asm volatile("" : : : "memory"); 129 } 130 131 #endif /* !_SH3_LOCK_H_ */ 132