1 /* $NetBSD: intr.h,v 1.13 2000/06/04 21:27:40 mycroft Exp $ */ 2 3 /*- 4 * Copyright (c) 1998 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. 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 extern void Xspllower __P((void)); 77 78 static __inline int splraise __P((int)); 79 static __inline int spllower __P((int)); 80 static __inline void splx __P((int)); 81 static __inline void softintr __P((int)); 82 83 /* 84 * Add a mask to cpl, and return the old value of cpl. 85 */ 86 static __inline int 87 splraise(ncpl) 88 register int ncpl; 89 { 90 register int ocpl = cpl; 91 92 cpl = ocpl | ncpl; 93 return (ocpl); 94 } 95 96 /* 97 * Restore a value to cpl (unmasking interrupts). If any unmasked 98 * interrupts are pending, call Xspllower() to process them. 99 */ 100 static __inline void 101 splx(ncpl) 102 register int ncpl; 103 { 104 105 cpl = ncpl; 106 if (ipending & ~ncpl) 107 Xspllower(); 108 } 109 110 /* 111 * Same as splx(), but we return the old value of spl, for the 112 * benefit of some splsoftclock() callers. 113 */ 114 static __inline int 115 spllower(ncpl) 116 register int ncpl; 117 { 118 register int ocpl = cpl; 119 120 cpl = ncpl; 121 if (ipending & ~ncpl) 122 Xspllower(); 123 return (ocpl); 124 } 125 126 /* 127 * Hardware interrupt masks 128 */ 129 #define splbio() splraise(imask[IPL_BIO]) 130 #define splnet() splraise(imask[IPL_NET]) 131 #define spltty() splraise(imask[IPL_TTY]) 132 #define splaudio() splraise(imask[IPL_AUDIO]) 133 #define splclock() splraise(imask[IPL_CLOCK]) 134 #define splstatclock() splclock() 135 #define splserial() splraise(imask[IPL_SERIAL]) 136 137 #define spllpt() spltty() 138 139 /* 140 * Software interrupt masks 141 * 142 * NOTE: splsoftclock() is used by hardclock() to lower the priority from 143 * clock to softclock before it calls softclock(). 144 */ 145 #define spllowersoftclock() spllower(imask[IPL_SOFTCLOCK]) 146 #define splsoftclock() splraise(imask[IPL_SOFTCLOCK]) 147 #define splsoftnet() splraise(imask[IPL_SOFTNET]) 148 #define splsoftserial() splraise(imask[IPL_SOFTSERIAL]) 149 150 /* 151 * Miscellaneous 152 */ 153 #define splimp() splraise(imask[IPL_IMP]) 154 #define splhigh() splraise(imask[IPL_HIGH]) 155 #define spl0() spllower(0) 156 157 /* 158 * Software interrupt registration 159 * 160 * We hand-code this to ensure that it's atomic. 161 */ 162 static __inline void 163 softintr(mask) 164 register int mask; 165 { 166 __asm __volatile("orl %1, %0" : "=m"(ipending) : "ir" (1 << mask)); 167 } 168 169 #define setsoftast() (astpending = 1) 170 #define setsoftclock() softintr(SIR_CLOCK) 171 #define setsoftnet() softintr(SIR_NET) 172 #define setsoftserial() softintr(SIR_SERIAL) 173 174 #endif /* !_LOCORE */ 175 176 #endif /* !_I386_INTR_H_ */ 177