Home | History | Annotate | Line # | Download | only in include
intr.h revision 1.9 
      1 /*	$NetBSD: intr.h,v 1.9 1998/08/15 05:10:24 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 #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	splsoftclock()	spllower(imask[IPL_SOFTCLOCK])
    143 #define	splsoftnet()	splraise(imask[IPL_SOFTNET])
    144 #define	splsoftserial()	splraise(imask[IPL_SOFTSERIAL])
    145 
    146 /*
    147  * Miscellaneous
    148  */
    149 #define	splimp()	splraise(imask[IPL_IMP])
    150 #define	splhigh()	splraise(imask[IPL_HIGH])
    151 #define	spl0()		spllower(0)
    152 
    153 /*
    154  * Software interrupt registration
    155  *
    156  * We hand-code this to ensure that it's atomic.
    157  */
    158 static __inline void
    159 softintr(mask)
    160 	register int mask;
    161 {
    162 
    163 	__asm __volatile("orl %0,_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