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intr.h revision 1.1 
      1 /*	$NetBSD: intr.h,v 1.1 2000/01/23 20:24:28 soda Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1996 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 _ARC_INTR_H_
     33 #define _ARC_INTR_H_
     34 
     35 /* Interrupt priority `levels'; not mutually exclusive. */
     36 #define	IPL_BIO		0	/* block I/O */
     37 #define	IPL_NET		1	/* network */
     38 #define	IPL_TTY		2	/* terminal */
     39 #define	IPL_CLOCK	3	/* clock */
     40 #define	IPL_IMP		4	/* memory allocation */
     41 #define	IPL_NONE	5	/* nothing */
     42 #define	IPL_HIGH	6	/* everything */
     43 
     44 /* Interrupt sharing types. */
     45 #define	IST_NONE	0	/* none */
     46 #define	IST_PULSE	1	/* pulsed */
     47 #define	IST_EDGE	2	/* edge-triggered */
     48 #define	IST_LEVEL	3	/* level-triggered */
     49 
     50 /* Soft interrupt masks. */
     51 #define	SIR_CLOCK	31
     52 #define	SIR_CLOCKMASK	((1 << SIR_CLOCK))
     53 #define	SIR_NET		30
     54 #define	SIR_NETMASK	((1 << SIR_NET) | SIR_CLOCKMASK)
     55 #define	SIR_TTY		29
     56 #define	SIR_TTYMASK	((1 << SIR_TTY) | SIR_CLOCKMASK)
     57 #define	SIR_ALLMASK	(SIR_CLOCKMASK | SIR_NETMASK | SIR_TTYMASK)
     58 
     59 #ifndef _LOCORE
     60 
     61 void setsoftclock __P((void));
     62 void clearsoftclock __P((void));
     63 int  splsoftclock __P((void));
     64 void setsoftnet   __P((void));
     65 void clearsoftnet __P((void));
     66 int  splsoftnet   __P((void));
     67 
     68 struct clockframe;
     69 void set_intr __P((int, int(*)(u_int, struct clockframe *), int));
     70 
     71 volatile int cpl, ipending, astpending;
     72 int imask[7];
     73 
     74 #if 0
     75 extern void Xspllower __P((void));
     76 
     77 static __inline int splraise __P((int));
     78 static __inline int spllower __P((int));
     79 static __inline void splx __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 splx(ncpl)
    101 	register int ncpl;
    102 {
    103 
    104 	cpl = ncpl;
    105 	if (ipending & ~ncpl)
    106 		Xspllower();
    107 }
    108 
    109 /*
    110  * Same as splx(), but we return the old value of spl, for the
    111  * benefit of some splsoftclock() callers.
    112  */
    113 static __inline int
    114 spllower(ncpl)
    115 	register int ncpl;
    116 {
    117 	register int ocpl = cpl;
    118 
    119 	cpl = ncpl;
    120 	if (ipending & ~ncpl)
    121 		Xspllower();
    122 	return (ocpl);
    123 }
    124 #endif
    125 
    126 /*
    127  * Hardware interrupt masks
    128  */
    129 #if 0
    130 #define	splbio()	splraise(imask[IPL_BIO])
    131 #define	splnet()	splraise(imask[IPL_NET])
    132 #define	spltty()	splraise(imask[IPL_TTY])
    133 #define	splclock()	splraise(imask[IPL_CLOCK])
    134 #define	splimp()	splraise(imask[IPL_IMP])
    135 #define	splstatclock()	splclock()
    136 
    137 /*
    138  * Software interrupt masks
    139  *
    140  * NOTE: splsoftclock() is used by hardclock() to lower the priority from
    141  * clock to softclock before it calls softclock().
    142  */
    143 #define	splsoftclock()	spllower(SIR_CLOCKMASK)
    144 #define	splsoftnet()	splraise(SIR_NETMASK)
    145 #define	splsofttty()	splraise(SIR_TTYMASK)
    146 
    147 /*
    148  * Miscellaneous
    149  */
    150 #define	splhigh()	splraise(-1)
    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" (mask));
    164 }
    165 
    166 #define	setsoftast()	(astpending = 1)
    167 #define	setsoftclock()	softintr(1 << SIR_CLOCK)
    168 #define	setsoftnet()	softintr(1 << SIR_NET)
    169 #define	setsofttty()	softintr(1 << SIR_TTY)
    170 #endif
    171 
    172 #endif /* _LOCORE */
    173 
    174 #endif /* _ARC_INTR_H_ */
    175