1 /* $NetBSD: intr.h,v 1.12 1999/08/05 18:08:10 thorpej 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 #ifndef _LOCORE 69 70 volatile int cpl, ipending, astpending; 71 int imask[NIPL]; 72 73 extern void Xspllower __P((void)); 74 75 static __inline int splraise __P((int)); 76 static __inline int spllower __P((int)); 77 static __inline void splx __P((int)); 78 static __inline void softintr __P((int)); 79 80 /* 81 * Add a mask to cpl, and return the old value of cpl. 82 */ 83 static __inline int 84 splraise(ncpl) 85 register int ncpl; 86 { 87 register int ocpl = cpl; 88 89 cpl = ocpl | ncpl; 90 return (ocpl); 91 } 92 93 /* 94 * Restore a value to cpl (unmasking interrupts). If any unmasked 95 * interrupts are pending, call Xspllower() to process them. 96 */ 97 static __inline void 98 splx(ncpl) 99 register int ncpl; 100 { 101 102 cpl = ncpl; 103 if (ipending & ~ncpl) 104 Xspllower(); 105 } 106 107 /* 108 * Same as splx(), but we return the old value of spl, for the 109 * benefit of some splsoftclock() callers. 110 */ 111 static __inline int 112 spllower(ncpl) 113 register int ncpl; 114 { 115 register int ocpl = cpl; 116 117 cpl = ncpl; 118 if (ipending & ~ncpl) 119 Xspllower(); 120 return (ocpl); 121 } 122 123 /* 124 * Hardware interrupt masks 125 */ 126 #define splbio() splraise(imask[IPL_BIO]) 127 #define splnet() splraise(imask[IPL_NET]) 128 #define spltty() splraise(imask[IPL_TTY]) 129 #define splaudio() splraise(imask[IPL_AUDIO]) 130 #define splclock() splraise(imask[IPL_CLOCK]) 131 #define splstatclock() splclock() 132 #define splserial() splraise(imask[IPL_SERIAL]) 133 134 #define spllpt() spltty() 135 136 /* 137 * Software interrupt masks 138 * 139 * NOTE: splsoftclock() is used by hardclock() to lower the priority from 140 * clock to softclock before it calls softclock(). 141 */ 142 #define spllowersoftclock() spllower(imask[IPL_SOFTCLOCK]) 143 #define splsoftclock() splraise(imask[IPL_SOFTCLOCK]) 144 #define splsoftnet() splraise(imask[IPL_SOFTNET]) 145 #define splsoftserial() splraise(imask[IPL_SOFTSERIAL]) 146 147 /* 148 * Miscellaneous 149 */ 150 #define splimp() splraise(imask[IPL_IMP]) 151 #define splhigh() splraise(imask[IPL_HIGH]) 152 #define spl0() spllower(0) 153 154 /* 155 * Software interrupt registration 156 * 157 * We hand-code this to ensure that it's atomic. 158 */ 159 static __inline void 160 softintr(mask) 161 register int mask; 162 { 163 __asm __volatile("orl %1, %0" : "=m"(ipending) : "ir" (1 << mask)); 164 } 165 166 #define setsoftast() (astpending = 1) 167 #define setsoftclock() softintr(SIR_CLOCK) 168 #define setsoftnet() softintr(SIR_NET) 169 #define setsoftserial() softintr(SIR_SERIAL) 170 171 #endif /* !_LOCORE */ 172 173 #endif /* !_I386_INTR_H_ */ 174