intr.c revision 1.3.2.2
1 1.3.2.2 skrll /* $NetBSD: intr.c,v 1.3.2.2 2008/10/10 22:36:16 skrll Exp $ */ 2 1.2 ad 3 1.3.2.2 skrll /* 4 1.3.2.2 skrll * Copyright (c) 2008 Antti Kantee. All Rights Reserved. 5 1.2 ad * 6 1.2 ad * Redistribution and use in source and binary forms, with or without 7 1.2 ad * modification, are permitted provided that the following conditions 8 1.2 ad * are met: 9 1.2 ad * 1. Redistributions of source code must retain the above copyright 10 1.2 ad * notice, this list of conditions and the following disclaimer. 11 1.2 ad * 2. Redistributions in binary form must reproduce the above copyright 12 1.2 ad * notice, this list of conditions and the following disclaimer in the 13 1.2 ad * documentation and/or other materials provided with the distribution. 14 1.2 ad * 15 1.3.2.2 skrll * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 16 1.3.2.2 skrll * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 17 1.3.2.2 skrll * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 18 1.3.2.2 skrll * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 1.3.2.2 skrll * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 1.3.2.2 skrll * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 21 1.3.2.2 skrll * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 1.3.2.2 skrll * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 1.3.2.2 skrll * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 1.3.2.2 skrll * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 1.3.2.2 skrll * SUCH DAMAGE. 26 1.2 ad */ 27 1.2 ad 28 1.2 ad #include <sys/param.h> 29 1.2 ad #include <sys/cpu.h> 30 1.3.2.2 skrll #include <sys/kthread.h> 31 1.3.2.2 skrll #include <sys/intr.h> 32 1.2 ad 33 1.3.2.2 skrll #include <rump/rumpuser.h> 34 1.3.2.2 skrll 35 1.3.2.2 skrll #include "rump_private.h" 36 1.3.2.2 skrll 37 1.3.2.2 skrll /* 38 1.3.2.2 skrll * Interrupt simulator. It executes hardclock() and softintrs. 39 1.3.2.2 skrll */ 40 1.3.2.2 skrll 41 1.3.2.2 skrll struct softint { 42 1.3.2.2 skrll void (*si_func)(void *); 43 1.3.2.2 skrll void *si_arg; 44 1.3.2.2 skrll bool si_onlist; 45 1.3.2.2 skrll bool si_mpsafe; 46 1.3.2.2 skrll 47 1.3.2.2 skrll LIST_ENTRY(softint) si_entries; 48 1.2 ad }; 49 1.3.2.2 skrll static LIST_HEAD(, softint) si_pending = LIST_HEAD_INITIALIZER(si_pending); 50 1.3.2.2 skrll static kmutex_t si_mtx; 51 1.3.2.2 skrll static kcondvar_t si_cv; 52 1.2 ad 53 1.3.2.2 skrll static void 54 1.3.2.2 skrll intr_worker(void *arg) 55 1.2 ad { 56 1.3.2.2 skrll struct softint *si; 57 1.3.2.2 skrll void (*func)(void *) = NULL; 58 1.3.2.2 skrll void *funarg = NULL; /* XXX gcc */ 59 1.3.2.2 skrll bool mpsafe = false; /* XXX gcc */ 60 1.3.2.2 skrll 61 1.3.2.2 skrll for (;;) { 62 1.3.2.2 skrll /* 63 1.3.2.2 skrll * XXX: not exactly executed once per tick, but without 64 1.3.2.2 skrll * a proper timer ticktocking we don't really care. 65 1.3.2.2 skrll */ 66 1.3.2.2 skrll callout_hardclock(); 67 1.3.2.2 skrll 68 1.3.2.2 skrll mutex_enter(&si_mtx); 69 1.3.2.2 skrll if (LIST_EMPTY(&si_pending)) { 70 1.3.2.2 skrll cv_timedwait(&si_cv, &si_mtx, 1); 71 1.3.2.2 skrll } else { 72 1.3.2.2 skrll si = LIST_FIRST(&si_pending); 73 1.3.2.2 skrll func = si->si_func; 74 1.3.2.2 skrll funarg = si->si_arg; 75 1.3.2.2 skrll mpsafe = si->si_mpsafe; 76 1.3.2.2 skrll 77 1.3.2.2 skrll si->si_onlist = false; 78 1.3.2.2 skrll LIST_REMOVE(si, si_entries); 79 1.3.2.2 skrll } 80 1.3.2.2 skrll mutex_exit(&si_mtx); 81 1.3.2.2 skrll 82 1.3.2.2 skrll if (func) { 83 1.3.2.2 skrll if (!mpsafe) 84 1.3.2.2 skrll KERNEL_LOCK(1, curlwp); 85 1.3.2.2 skrll func(funarg); 86 1.3.2.2 skrll func = NULL; 87 1.3.2.2 skrll if (!mpsafe) 88 1.3.2.2 skrll KERNEL_UNLOCK_ONE(curlwp); 89 1.3.2.2 skrll } 90 1.2 ad } 91 1.2 ad } 92 1.2 ad 93 1.2 ad void 94 1.3.2.2 skrll softint_init(struct cpu_info *ci) 95 1.2 ad { 96 1.3.2.2 skrll int rv; 97 1.2 ad 98 1.3.2.2 skrll mutex_init(&si_mtx, MUTEX_DEFAULT, IPL_NONE); 99 1.3.2.2 skrll cv_init(&si_cv, "intrw8"); 100 1.3.2.2 skrll 101 1.3.2.2 skrll /* XXX: should have separate "wanttimer" control */ 102 1.3.2.2 skrll if (rump_threads) { 103 1.3.2.2 skrll rv = kthread_create(PRI_NONE, 0, NULL, intr_worker, NULL, NULL, 104 1.3.2.2 skrll "rumpmtr"); 105 1.3.2.2 skrll if (rv) 106 1.3.2.2 skrll panic("timer thread creation failed %d", rv); 107 1.3.2.2 skrll } 108 1.3.2.2 skrll } 109 1.3.2.2 skrll 110 1.3.2.2 skrll /* 111 1.3.2.2 skrll * Soft interrupts bring two choices. If we are running with thread 112 1.3.2.2 skrll * support enabled, defer execution, otherwise execute in place. 113 1.3.2.2 skrll * See softint_schedule(). 114 1.3.2.2 skrll * 115 1.3.2.2 skrll * As there is currently no clear concept of when a thread finishes 116 1.3.2.2 skrll * work (although rump_clear_curlwp() is close), simply execute all 117 1.3.2.2 skrll * softints in the timer thread. This is probably not the most 118 1.3.2.2 skrll * efficient method, but good enough for now. 119 1.3.2.2 skrll */ 120 1.3.2.2 skrll void * 121 1.3.2.2 skrll softint_establish(u_int flags, void (*func)(void *), void *arg) 122 1.3.2.2 skrll { 123 1.3.2.2 skrll struct softint *si; 124 1.3.2.2 skrll 125 1.3.2.2 skrll si = kmem_alloc(sizeof(*si), KM_SLEEP); 126 1.3.2.2 skrll si->si_func = func; 127 1.3.2.2 skrll si->si_arg = arg; 128 1.3.2.2 skrll si->si_onlist = false; 129 1.3.2.2 skrll si->si_mpsafe = flags & SOFTINT_MPSAFE; 130 1.3.2.2 skrll 131 1.3.2.2 skrll return si; 132 1.2 ad } 133 1.2 ad 134 1.2 ad void 135 1.2 ad softint_schedule(void *arg) 136 1.2 ad { 137 1.3.2.2 skrll struct softint *si = arg; 138 1.2 ad 139 1.3.2.2 skrll if (!rump_threads) { 140 1.3.2.2 skrll si->si_func(si->si_arg); 141 1.3.2.2 skrll } else { 142 1.3.2.2 skrll mutex_enter(&si_mtx); 143 1.3.2.2 skrll if (!si->si_onlist) { 144 1.3.2.2 skrll LIST_INSERT_HEAD(&si_pending, si, si_entries); 145 1.3.2.2 skrll si->si_onlist = true; 146 1.3.2.2 skrll } 147 1.3.2.2 skrll cv_signal(&si_cv); 148 1.3.2.2 skrll mutex_exit(&si_mtx); 149 1.3.2.2 skrll } 150 1.2 ad } 151 1.2 ad 152 1.2 ad bool 153 1.3.2.2 skrll cpu_intr_p() 154 1.2 ad { 155 1.2 ad 156 1.2 ad return false; 157 1.2 ad } 158
Indexes created Tue Sep 23 23:09:58 GMT 2025