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intr.h revision 1.12.12.1 
      1 /*	$NetBSD: intr.h,v 1.12.12.1 2000/06/22 17:00:32 minoura 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 void spllower __P((int));
     80 static __inline void softintr __P((int));
     81 
     82 /*
     83  * Add a mask to cpl, and return the old value of cpl.
     84  */
     85 static __inline int
     86 splraise(ncpl)
     87 	register int ncpl;
     88 {
     89 	register int ocpl = cpl;
     90 
     91 	cpl = ocpl | ncpl;
     92 	return (ocpl);
     93 }
     94 
     95 /*
     96  * Restore a value to cpl (unmasking interrupts).  If any unmasked
     97  * interrupts are pending, call Xspllower() to process them.
     98  */
     99 static __inline void
    100 spllower(ncpl)
    101 	register int ncpl;
    102 {
    103 
    104 	cpl = ncpl;
    105 	if (ipending & ~ncpl)
    106 		Xspllower();
    107 }
    108 
    109 /*
    110  * Hardware interrupt masks
    111  */
    112 #define	splbio()	splraise(imask[IPL_BIO])
    113 #define	splnet()	splraise(imask[IPL_NET])
    114 #define	spltty()	splraise(imask[IPL_TTY])
    115 #define	splaudio()	splraise(imask[IPL_AUDIO])
    116 #define	splclock()	splraise(imask[IPL_CLOCK])
    117 #define	splstatclock()	splclock()
    118 #define	splserial()	splraise(imask[IPL_SERIAL])
    119 
    120 #define spllpt()	spltty()
    121 
    122 /*
    123  * Software interrupt masks
    124  *
    125  * NOTE: splsoftclock() is used by hardclock() to lower the priority from
    126  * clock to softclock before it calls softclock().
    127  */
    128 #define	spllowersoftclock() spllower(imask[IPL_SOFTCLOCK])
    129 #define	splsoftclock()	splraise(imask[IPL_SOFTCLOCK])
    130 #define	splsoftnet()	splraise(imask[IPL_SOFTNET])
    131 #define	splsoftserial()	splraise(imask[IPL_SOFTSERIAL])
    132 
    133 /*
    134  * Miscellaneous
    135  */
    136 #define	splimp()	splraise(imask[IPL_IMP])
    137 #define	splhigh()	splraise(imask[IPL_HIGH])
    138 #define	spl0()		spllower(0)
    139 #define	splx(x)		spllower(x)
    140 
    141 /*
    142  * Software interrupt registration
    143  *
    144  * We hand-code this to ensure that it's atomic.
    145  */
    146 static __inline void
    147 softintr(mask)
    148 	register int mask;
    149 {
    150 	__asm __volatile("orl %1, %0" : "=m"(ipending) : "ir" (1 << mask));
    151 }
    152 
    153 #define	setsoftast()	(astpending = 1)
    154 #define	setsoftclock()	softintr(SIR_CLOCK)
    155 #define	setsoftnet()	softintr(SIR_NET)
    156 #define	setsoftserial()	softintr(SIR_SERIAL)
    157 
    158 #endif /* !_LOCORE */
    159 
    160 #endif /* !_I386_INTR_H_ */
    161