intr.h revision 1.24
1 /* $NetBSD: intr.h,v 1.24 2001/12/18 15:21:13 yamt Exp $ */ 2 3 /*- 4 * Copyright (c) 1998, 2001 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Charles M. Hannum, and by Jason R. Thorpe. 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 #ifndef _I386_INTR_H_ 40 #define _I386_INTR_H_ 41 42 /* Interrupt priority `levels'. */ 43 #define IPL_NONE 9 /* nothing */ 44 #define IPL_SOFTCLOCK 8 /* timeouts */ 45 #define IPL_SOFTNET 7 /* protocol stacks */ 46 #define IPL_BIO 6 /* block I/O */ 47 #define IPL_NET 5 /* network */ 48 #define IPL_SOFTSERIAL 4 /* serial */ 49 #define IPL_TTY 3 /* terminal */ 50 #define IPL_IMP 3 /* memory allocation */ 51 #define IPL_AUDIO 2 /* audio */ 52 #define IPL_CLOCK 1 /* clock */ 53 #define IPL_HIGH 1 /* everything */ 54 #define IPL_SERIAL 0 /* serial */ 55 #define NIPL 10 56 57 /* Interrupt sharing types. */ 58 #define IST_NONE 0 /* none */ 59 #define IST_PULSE 1 /* pulsed */ 60 #define IST_EDGE 2 /* edge-triggered */ 61 #define IST_LEVEL 3 /* level-triggered */ 62 63 /* Soft interrupt masks. */ 64 #define SIR_CLOCK 31 65 #define SIR_NET 30 66 #define SIR_SERIAL 29 67 68 /* Hack for CLKF_INTR(). */ 69 #define IPL_TAGINTR 28 70 71 #ifndef _LOCORE 72 73 volatile int cpl, ipending, astpending; 74 int imask[NIPL]; 75 76 void Xspllower __P((void)); 77 78 static __inline int splraise __P((int)); 79 static __inline void spllower __P((int)); 80 static __inline void softintr __P((int)); 81 82 /* 83 * compiler barrier: prevent reordering of instructions. 84 * XXX something similar will move to <sys/cdefs.h> 85 * or thereabouts. 86 * This prevents the compiler from reordering code around 87 * this "instruction", acting as a sequence point for code generation. 88 */ 89 90 #define __splbarrier() __asm __volatile("":::"memory") 91 92 /* 93 * Add a mask to cpl, and return the old value of cpl. 94 */ 95 static __inline int 96 splraise(ncpl) 97 register int ncpl; 98 { 99 register int ocpl = cpl; 100 101 cpl = ocpl | ncpl; 102 __splbarrier(); 103 return (ocpl); 104 } 105 106 /* 107 * Restore a value to cpl (unmasking interrupts). If any unmasked 108 * interrupts are pending, call Xspllower() to process them. 109 */ 110 static __inline void 111 spllower(ncpl) 112 register int ncpl; 113 { 114 115 __splbarrier(); 116 cpl = ncpl; 117 if (ipending & ~ncpl) 118 Xspllower(); 119 } 120 121 /* 122 * Hardware interrupt masks 123 */ 124 #define splbio() splraise(imask[IPL_BIO]) 125 #define splnet() splraise(imask[IPL_NET]) 126 #define spltty() splraise(imask[IPL_TTY]) 127 #define splaudio() splraise(imask[IPL_AUDIO]) 128 #define splclock() splraise(imask[IPL_CLOCK]) 129 #define splstatclock() splclock() 130 #define splserial() splraise(imask[IPL_SERIAL]) 131 132 #define spllpt() spltty() 133 134 /* 135 * Software interrupt masks 136 * 137 * NOTE: splsoftclock() is used by hardclock() to lower the priority from 138 * clock to softclock before it calls softclock(). 139 */ 140 #define spllowersoftclock() spllower(imask[IPL_SOFTCLOCK]) 141 #define splsoftclock() splraise(imask[IPL_SOFTCLOCK]) 142 #define splsoftnet() splraise(imask[IPL_SOFTNET]) 143 #define splsoftserial() splraise(imask[IPL_SOFTSERIAL]) 144 145 /* 146 * Miscellaneous 147 */ 148 #define splvm() splraise(imask[IPL_IMP]) 149 #define splhigh() splraise(imask[IPL_HIGH]) 150 #define splsched() splhigh() 151 #define spllock() splhigh() 152 #define spl0() spllower(0) 153 #define splx(x) spllower(x) 154 155 /* 156 * Software interrupt registration 157 * 158 * We hand-code this to ensure that it's atomic. 159 */ 160 static __inline void 161 softintr(mask) 162 register int mask; 163 { 164 __asm __volatile("orl %1, %0" : "=m"(ipending) : "ir" (1 << mask)); 165 } 166 167 #define setsoftast() (astpending = 1) 168 #define setsoftnet() softintr(SIR_NET) 169 170 #endif /* !_LOCORE */ 171 172 /* 173 * Generic software interrupt support. 174 */ 175 176 #define I386_SOFTINTR_SOFTCLOCK 0 177 #define I386_SOFTINTR_SOFTNET 1 178 #define I386_SOFTINTR_SOFTSERIAL 2 179 #define I386_NSOFTINTR 3 180 181 #ifndef _LOCORE 182 #include <sys/queue.h> 183 184 struct i386_soft_intrhand { 185 TAILQ_ENTRY(i386_soft_intrhand) 186 sih_q; 187 struct i386_soft_intr *sih_intrhead; 188 void (*sih_fn)(void *); 189 void *sih_arg; 190 int sih_pending; 191 }; 192 193 struct i386_soft_intr { 194 TAILQ_HEAD(, i386_soft_intrhand) 195 softintr_q; 196 int softintr_ssir; 197 }; 198 199 #define i386_softintr_lock(si, s) \ 200 do { \ 201 /* XXX splhigh braindamage on i386 */ \ 202 (s) = splserial(); \ 203 } while (/*CONSTCOND*/ 0) 204 205 #define i386_softintr_unlock(si, s) \ 206 do { \ 207 splx((s)); \ 208 } while (/*CONSTCOND*/ 0) 209 210 void *softintr_establish(int, void (*)(void *), void *); 211 void softintr_disestablish(void *); 212 void softintr_init(void); 213 void softintr_dispatch(int); 214 215 #define softintr_schedule(arg) \ 216 do { \ 217 struct i386_soft_intrhand *__sih = (arg); \ 218 struct i386_soft_intr *__si = __sih->sih_intrhead; \ 219 int __s; \ 220 \ 221 i386_softintr_lock(__si, __s); \ 222 if (__sih->sih_pending == 0) { \ 223 TAILQ_INSERT_TAIL(&__si->softintr_q, __sih, sih_q); \ 224 __sih->sih_pending = 1; \ 225 softintr(__si->softintr_ssir); \ 226 } \ 227 i386_softintr_unlock(__si, __s); \ 228 } while (/*CONSTCOND*/ 0) 229 #endif /* _LOCORE */ 230 231 #endif /* !_I386_INTR_H_ */ 232
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