1 /* $NetBSD: intr.h,v 1.7 1997/03/21 04:34:18 mycroft Exp $ */ 2 3 /* 4 * Copyright (c) 1996, 1997 Charles M. Hannum. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by Charles M. Hannum. 17 * 4. The name of the author may not be used to endorse or promote products 18 * derived from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #ifndef _I386_INTR_H_ 33 #define _I386_INTR_H_ 34 35 /* Interrupt priority `levels'. */ 36 #define IPL_NONE 9 /* nothing */ 37 #define IPL_SOFTCLOCK 8 /* timeouts */ 38 #define IPL_SOFTNET 7 /* protocol stacks */ 39 #define IPL_BIO 6 /* block I/O */ 40 #define IPL_NET 5 /* network */ 41 #define IPL_SOFTSERIAL 4 /* serial */ 42 #define IPL_TTY 3 /* terminal */ 43 #define IPL_IMP 3 /* memory allocation */ 44 #define IPL_AUDIO 2 /* audio */ 45 #define IPL_CLOCK 1 /* clock */ 46 #define IPL_HIGH 1 /* everything */ 47 #define IPL_SERIAL 0 /* serial */ 48 #define NIPL 10 49 50 /* Interrupt sharing types. */ 51 #define IST_NONE 0 /* none */ 52 #define IST_PULSE 1 /* pulsed */ 53 #define IST_EDGE 2 /* edge-triggered */ 54 #define IST_LEVEL 3 /* level-triggered */ 55 56 /* Soft interrupt masks. */ 57 #define SIR_CLOCK 31 58 #define SIR_NET 30 59 #define SIR_SERIAL 29 60 61 #ifndef _LOCORE 62 63 volatile int cpl, ipending, astpending; 64 int imask[NIPL]; 65 66 extern void Xspllower __P((void)); 67 68 static __inline int splraise __P((int)); 69 static __inline int spllower __P((int)); 70 static __inline void splx __P((int)); 71 static __inline void softintr __P((int)); 72 73 /* 74 * Add a mask to cpl, and return the old value of cpl. 75 */ 76 static __inline int 77 splraise(ncpl) 78 register int ncpl; 79 { 80 register int ocpl = cpl; 81 82 cpl = ocpl | ncpl; 83 return (ocpl); 84 } 85 86 /* 87 * Restore a value to cpl (unmasking interrupts). If any unmasked 88 * interrupts are pending, call Xspllower() to process them. 89 */ 90 static __inline void 91 splx(ncpl) 92 register int ncpl; 93 { 94 95 cpl = ncpl; 96 if (ipending & ~ncpl) 97 Xspllower(); 98 } 99 100 /* 101 * Same as splx(), but we return the old value of spl, for the 102 * benefit of some splsoftclock() callers. 103 */ 104 static __inline int 105 spllower(ncpl) 106 register int ncpl; 107 { 108 register int ocpl = cpl; 109 110 cpl = ncpl; 111 if (ipending & ~ncpl) 112 Xspllower(); 113 return (ocpl); 114 } 115 116 /* 117 * Hardware interrupt masks 118 */ 119 #define splbio() splraise(imask[IPL_BIO]) 120 #define splnet() splraise(imask[IPL_NET]) 121 #define spltty() splraise(imask[IPL_TTY]) 122 #define splaudio() splraise(imask[IPL_AUDIO]) 123 #define splclock() splraise(imask[IPL_CLOCK]) 124 #define splstatclock() splclock() 125 #define splserial() splraise(imask[IPL_SERIAL]) 126 127 /* 128 * Software interrupt masks 129 * 130 * NOTE: splsoftclock() is used by hardclock() to lower the priority from 131 * clock to softclock before it calls softclock(). 132 */ 133 #define splsoftclock() spllower(imask[IPL_SOFTCLOCK]) 134 #define splsoftnet() splraise(imask[IPL_SOFTNET]) 135 #define splsoftserial() splraise(imask[IPL_SOFTSERIAL]) 136 137 /* 138 * Miscellaneous 139 */ 140 #define splimp() splraise(imask[IPL_IMP]) 141 #define splhigh() splraise(imask[IPL_HIGH]) 142 #define spl0() spllower(0) 143 144 /* 145 * Software interrupt registration 146 * 147 * We hand-code this to ensure that it's atomic. 148 */ 149 static __inline void 150 softintr(mask) 151 register int mask; 152 { 153 154 __asm __volatile("orl %0,_ipending" : : "ir" (1 << mask)); 155 } 156 157 #define setsoftast() (astpending = 1) 158 #define setsoftclock() softintr(SIR_CLOCK) 159 #define setsoftnet() softintr(SIR_NET) 160 #define setsoftserial() softintr(SIR_SERIAL) 161 162 #endif /* !_LOCORE */ 163 164 #endif /* !_I386_INTR_H_ */ 165