lock.h revision 1.16.12.3
1 /* $NetBSD: lock.h,v 1.16.12.3 2007/09/03 14:30:48 yamt Exp $ */ 2 3 /* 4 * Copyright (c) 2000 Ludd, University of Lule}, Sweden. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed at Ludd, University of Lule}. 18 * 4. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #ifndef _VAX_LOCK_H_ 34 #define _VAX_LOCK_H_ 35 36 #ifdef _KERNEL 37 #ifdef _KERNEL_OPT 38 #include "opt_multiprocessor.h" 39 #include <machine/intr.h> 40 #endif 41 #include <machine/cpu.h> 42 #endif 43 44 static __inline void __cpu_simple_lock_init(__cpu_simple_lock_t *); 45 static __inline void 46 __cpu_simple_lock_init(__cpu_simple_lock_t *__alp) 47 { 48 #ifdef _KERNEL 49 __asm volatile ("movl %0,%%r1;jsb Sunlock" 50 : /* No output */ 51 : "g"(__alp) 52 : "r1","cc","memory"); 53 #else 54 __asm volatile ("bbcci $0,%0,1f;1:" 55 : /* No output */ 56 : "m"(*__alp) 57 : "cc"); 58 #endif 59 } 60 61 static __inline int __cpu_simple_lock_try(__cpu_simple_lock_t *); 62 static __inline int 63 __cpu_simple_lock_try(__cpu_simple_lock_t *__alp) 64 { 65 int ret; 66 67 #ifdef _KERNEL 68 __asm volatile ("movl %1,%%r1;jsb Slocktry;movl %%r0,%0" 69 : "=&r"(ret) 70 : "g"(__alp) 71 : "r0","r1","cc","memory"); 72 #else 73 __asm volatile ("clrl %0;bbssi $0,%1,1f;incl %0;1:" 74 : "=&r"(ret) 75 : "m"(*__alp) 76 : "cc"); 77 #endif 78 79 return ret; 80 } 81 82 #ifdef _KERNEL 83 #if defined(MULTIPROCESSOR) 84 #define VAX_LOCK_CHECKS ((1 << IPI_SEND_CNCHAR) | (1 << IPI_DDB)) 85 #define __cpu_simple_lock(__alp) \ 86 do { \ 87 struct cpu_info *__ci = curcpu(); \ 88 \ 89 while (__cpu_simple_lock_try(__alp) == 0) { \ 90 int __s; \ 91 \ 92 if (__ci->ci_ipimsgs & VAX_LOCK_CHECKS) { \ 93 __s = splipi(); \ 94 cpu_handle_ipi(); \ 95 splx(__s); \ 96 } \ 97 } \ 98 } while (/*CONSTCOND*/0) 99 #else /* MULTIPROCESSOR */ 100 #define __cpu_simple_lock(__alp) \ 101 do { \ 102 while (__cpu_simple_lock_try(__alp) == 0) { \ 103 ; \ 104 } \ 105 } while (/*CONSTCOND*/0) 106 #endif 107 #else 108 static __inline void __cpu_simple_lock(__cpu_simple_lock_t *); 109 static __inline void 110 __cpu_simple_lock(__cpu_simple_lock_t *__alp) 111 { 112 __asm volatile ("1:bbssi $0,%0,1b" 113 : /* No outputs */ 114 : "m"(*__alp) 115 : "cc"); 116 } 117 #endif /* _KERNEL */ 118 119 #if 0 120 static __inline void __cpu_simple_lock(__cpu_simple_lock_t *); 121 static __inline void 122 __cpu_simple_lock(__cpu_simple_lock_t *__alp) 123 { 124 struct cpu_info *ci = curcpu(); 125 126 while (__cpu_simple_lock_try(__alp) == 0) { 127 int s; 128 129 if (ci->ci_ipimsgs & IPI_SEND_CNCHAR) { 130 s = splipi(); 131 cpu_handle_ipi(); 132 splx(s); 133 } 134 } 135 136 #if 0 137 __asm volatile ("movl %0,%%r1;jsb Slock" 138 : /* No output */ 139 : "g"(__alp) 140 : "r0","r1","cc","memory"); 141 #endif 142 #if 0 143 __asm volatile ("1:;bbssi $0, %0, 1b" 144 : /* No output */ 145 : "m"(*__alp)); 146 #endif 147 } 148 #endif 149 150 static __inline void __cpu_simple_unlock(__cpu_simple_lock_t *); 151 static __inline void 152 __cpu_simple_unlock(__cpu_simple_lock_t *__alp) 153 { 154 #ifdef _KERNEL 155 __asm volatile ("movl %0,%%r1;jsb Sunlock" 156 : /* No output */ 157 : "g"(__alp) 158 : "r1","cc","memory"); 159 #else 160 __asm volatile ("bbcci $0,%0,1f;1:" 161 : /* No output */ 162 : "m"(*__alp) 163 : "cc"); 164 #endif 165 } 166 167 #if defined(MULTIPROCESSOR) 168 /* 169 * On the Vax, interprocessor interrupts can come in at device priority 170 * level or lower. This can cause some problems while waiting for r/w 171 * spinlocks from a high'ish priority level: IPIs that come in will not 172 * be processed. This can lead to deadlock. 173 * 174 * This hook allows IPIs to be processed while a spinlock's interlock 175 * is released. 176 */ 177 #define SPINLOCK_SPIN_HOOK \ 178 do { \ 179 struct cpu_info *__ci = curcpu(); \ 180 int __s; \ 181 \ 182 if (__ci->ci_ipimsgs != 0) { \ 183 /* printf("CPU %lu has IPIs pending\n", \ 184 __ci->ci_cpuid); */ \ 185 __s = splipi(); \ 186 cpu_handle_ipi(); \ 187 splx(__s); \ 188 } \ 189 } while (/*CONSTCOND*/0) 190 #endif /* MULTIPROCESSOR */ 191 192 static __inline void mb_read(void); 193 static __inline void 194 mb_read(void) 195 { 196 } 197 198 static __inline void mb_write(void); 199 static __inline void 200 mb_write(void) 201 { 202 } 203 #endif /* _VAX_LOCK_H_ */ 204
Indexes created Wed Oct 15 07:09:58 GMT 2025