1 /* 2 * Copyright (c) 2006 The DragonFly Project. All rights reserved. 3 * 4 * This code is derived from software contributed to The DragonFly Project 5 * by Matthew Dillon <dillon@backplane.com> 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 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * 3. Neither the name of The DragonFly Project nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific, prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <sys/types.h> 36 #include <sys/systm.h> 37 #include <sys/kernel.h> 38 #include <sys/machintr.h> 39 #include <sys/errno.h> 40 #include <sys/mman.h> 41 #include <sys/globaldata.h> 42 #include <sys/interrupt.h> 43 #include <stdio.h> 44 #include <signal.h> 45 #include <machine/globaldata.h> 46 #include <machine/md_var.h> 47 #include <sys/thread2.h> 48 49 #include <unistd.h> 50 51 /* 52 * Interrupt Subsystem ABI 53 */ 54 55 static void dummy_intr_disable(int); 56 static void dummy_intr_enable(int); 57 static void dummy_intr_setup(int, int); 58 static void dummy_intr_teardown(int); 59 static int dummy_legacy_intr_cpuid(int); 60 static void dummy_finalize(void); 61 static void dummy_intrcleanup(void); 62 static void dummy_stabilize(void); 63 64 struct machintr_abi MachIntrABI = { 65 MACHINTR_GENERIC, 66 .intr_disable = dummy_intr_disable, 67 .intr_enable = dummy_intr_enable, 68 .intr_setup = dummy_intr_setup, 69 .intr_teardown = dummy_intr_teardown, 70 .legacy_intr_cpuid = dummy_legacy_intr_cpuid, 71 72 .finalize = dummy_finalize, 73 .cleanup = dummy_intrcleanup, 74 .stabilize = dummy_stabilize 75 }; 76 77 static void 78 dummy_intr_disable(int intr) 79 { 80 } 81 82 static void 83 dummy_intr_enable(int intr) 84 { 85 } 86 87 static void 88 dummy_intr_setup(int intr, int flags) 89 { 90 } 91 92 static void 93 dummy_intr_teardown(int intr) 94 { 95 } 96 97 static void 98 dummy_finalize(void) 99 { 100 } 101 102 static void 103 dummy_intrcleanup(void) 104 { 105 } 106 107 static void 108 dummy_stabilize(void) 109 { 110 } 111 112 static int 113 dummy_legacy_intr_cpuid(int irq __unused) 114 { 115 return 0; 116 } 117 118 /* 119 * Process pending interrupts 120 */ 121 void 122 splz(void) 123 { 124 struct mdglobaldata *gd = mdcpu; 125 thread_t td = gd->mi.gd_curthread; 126 int irq; 127 128 while (gd->mi.gd_reqflags & (RQF_IPIQ|RQF_INTPEND)) { 129 crit_enter_quick(td); 130 if (gd->mi.gd_reqflags & RQF_IPIQ) { 131 atomic_clear_int(&gd->mi.gd_reqflags, RQF_IPIQ); 132 atomic_swap_int(&gd->mi.gd_npoll, 0); 133 lwkt_process_ipiq(); 134 } 135 if (gd->mi.gd_reqflags & RQF_INTPEND) { 136 atomic_clear_int(&gd->mi.gd_reqflags, RQF_INTPEND); 137 while ((irq = ffs(gd->gd_spending)) != 0) { 138 --irq; 139 atomic_clear_int(&gd->gd_spending, 1 << irq); 140 irq += FIRST_SOFTINT; 141 sched_ithd_soft(irq); 142 } 143 while ((irq = ffs(gd->gd_fpending)) != 0) { 144 --irq; 145 atomic_clear_int(&gd->gd_fpending, 1 << irq); 146 sched_ithd_hard_virtual(irq); 147 } 148 } 149 crit_exit_noyield(td); 150 } 151 } 152 153 /* 154 * Allows an unprotected signal handler or mailbox to signal an interrupt 155 * 156 * For sched_ithd_hard_virtual() to properly preempt via lwkt_schedule() we 157 * cannot enter a critical section here. We use td_nest_count instead. 158 */ 159 void 160 signalintr(int intr) 161 { 162 struct mdglobaldata *gd = mdcpu; 163 thread_t td = gd->mi.gd_curthread; 164 165 if (td->td_critcount || td->td_nest_count) { 166 atomic_set_int_nonlocked(&gd->gd_fpending, 1 << intr); 167 atomic_set_int(&gd->mi.gd_reqflags, RQF_INTPEND); 168 umtx_wakeup(&gd->mi.gd_reqflags, 0); 169 } else { 170 ++td->td_nest_count; 171 atomic_clear_int(&gd->gd_fpending, 1 << intr); 172 sched_ithd_hard_virtual(intr); 173 --td->td_nest_count; 174 } 175 } 176 177 /* 178 * Must block any signal normally handled as maskable interrupt. 179 */ 180 void 181 cpu_disable_intr(void) 182 { 183 sigblock(sigmask(SIGALRM)|sigmask(SIGIO)|sigmask(SIGUSR1)); 184 } 185 186 void 187 cpu_enable_intr(void) 188 { 189 sigsetmask(0); 190 } 191 192 void 193 cpu_mask_all_signals(void) 194 { 195 sigblock(sigmask(SIGALRM)|sigmask(SIGIO)|sigmask(SIGQUIT)| 196 sigmask(SIGUSR1)|sigmask(SIGTERM)|sigmask(SIGWINCH)| 197 sigmask(SIGUSR2)); 198 } 199 200 void 201 cpu_unmask_all_signals(void) 202 { 203 sigsetmask(0); 204 } 205