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intr.h revision 1.22 
      1 /* 	$NetBSD: intr.h,v 1.22 2007/02/16 01:34:02 matt Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1998 Matt Thomas.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. The name of the company nor the name of the author may be used to
     16  *    endorse or promote products derived from this software without specific
     17  *    prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
     20  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     21  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     22  * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
     23  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     24  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     25  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 #ifndef _VAX_INTR_H_
     33 #define _VAX_INTR_H_
     34 
     35 #include <sys/queue.h>
     36 #include <machine/mtpr.h>
     37 
     38 /* Define the various Interrupt Priority Levels */
     39 
     40 /* Interrupt Priority Levels are not mutually exclusive. */
     41 
     42 /* Hardware interrupt levels are 16 (0x10) thru 31 (0x1f)
     43  */
     44 #define IPL_HIGH	0x1f	/* high -- blocks all interrupts */
     45 #define IPL_CLOCK	0x18	/* clock */
     46 #define IPL_STATCLOCK	IPL_CLOCK
     47 #define IPL_UBA		0x17	/* unibus adapters */
     48 #define IPL_VM		0x17	/* memory allocation */
     49 #define IPL_NET		0x16	/* network */
     50 #define IPL_BIO		0x15	/* block I/O */
     51 #define IPL_TTY		0x15	/* terminal */
     52 #define IPL_AUDIO	0x15	/* audio */
     53 #define IPL_IPI		0x14	/* interprocessor interrupt */
     54 #define IPL_CONSMEDIA	0x14	/* console media */
     55 
     56 /* Software interrupt level s are 0 (0x00) thru 15 (0x0f)
     57  */
     58 #define IPL_SOFTDDB	0x0f	/* used by DDB on VAX */
     59 #define IPL_SOFTSERIAL	0x0d	/* soft serial */
     60 #define IPL_SOFTNET	0x0c	/* soft network */
     61 #define IPL_SOFTCLOCK	0x08
     62 #define IPL_NONE	0x00
     63 
     64 /* Misc
     65  */
     66 
     67 #define	IPL_SCHED	IPL_HIGH
     68 #define	IPL_LOCK	IPL_HIGH
     69 
     70 #define IPL_LEVELS	32
     71 
     72 #define IST_UNUSABLE	-1	/* interrupt cannot be used */
     73 #define IST_NONE	0	/* none (dummy) */
     74 #define IST_PULSE	1	/* pulsed */
     75 #define IST_EDGE	2	/* edge-triggered */
     76 #define IST_LEVEL	3	/* level-triggered */
     77 
     78 
     79 #ifdef _KERNEL
     80 typedef int ipl_t;
     81 
     82 static inline ipl_t
     83 splx(ipl_t new_ipl)
     84 {
     85 	ipl_t old_ipl = mfpr(PR_IPL);
     86 	mtpr(new_ipl, PR_IPL);
     87 	return old_ipl;
     88 }
     89 
     90 static inline void
     91 _splset(ipl_t ipl)
     92 {
     93 	mtpr(ipl, PR_IPL);
     94 }
     95 
     96 typedef struct {
     97 	ipl_t _ipl;
     98 } ipl_cookie_t;
     99 
    100 static inline ipl_cookie_t
    101 makeiplcookie(ipl_t ipl)
    102 {
    103 
    104 	return (ipl_cookie_t){._ipl = ipl};
    105 }
    106 
    107 static inline int
    108 splraiseipl(ipl_cookie_t icookie)
    109 {
    110 	register ipl_t __val;
    111 	ipl_t newipl = icookie._ipl;
    112 
    113 	__asm volatile ("mfpr %1,%0" : "=&g" (__val) : "g" (PR_IPL));
    114 	if (newipl > __val) {
    115 		_splset(newipl);
    116 	}
    117 	return __val;
    118 }
    119 
    120 #define _setsirr(reg)	mtpr((reg), PR_SIRR)
    121 
    122 #define spl0()		_splset(IPL_NONE)		/* IPL00 */
    123 #define spllowersoftclock() _splset(IPL_SOFTCLOCK)	/* IPL08 */
    124 #define splddb()	splraiseipl(makeiplcookie(IPL_SOFTDDB)) /* IPL0F */
    125 #define splconsmedia()	splraiseipl(makeiplcookie(IPL_CONSMEDIA)) /* IPL14 */
    126 
    127 #include <sys/spl.h>
    128 
    129 /* These are better to use when playing with VAX buses */
    130 #define	spluba()	splraiseipl(makeiplcookie(IPL_UBA)) /* IPL17 */
    131 #define spl4()		splx(0x14)
    132 #define spl5()		splx(0x15)
    133 #define spl6()		splx(0x16)
    134 #define spl7()		splx(0x17)
    135 
    136 /* schedule software interrupts
    137  */
    138 #define setsoftddb()	_setsirr(IPL_SOFTDDB)
    139 #define setsoftserial()	_setsirr(IPL_SOFTSERIAL)
    140 #define setsoftnet()	_setsirr(IPL_SOFTNET)
    141 
    142 #if !defined(_LOCORE)
    143 LIST_HEAD(sh_head, softintr_handler);
    144 
    145 struct softintr_head {
    146 	int shd_ipl;
    147 	struct sh_head shd_intrs;
    148 };
    149 
    150 struct softintr_handler {
    151 	struct softintr_head *sh_head;
    152 	LIST_ENTRY(softintr_handler) sh_link;
    153 	void (*sh_func)(void *);
    154 	void *sh_arg;
    155 	int sh_pending;
    156 };
    157 
    158 extern void *softintr_establish(int, void (*)(void *), void *);
    159 extern void softintr_disestablish(void *);
    160 
    161 static __inline void
    162 softintr_schedule(void *arg)
    163 {
    164 	struct softintr_handler * const sh = arg;
    165 	sh->sh_pending = 1;
    166 	_setsirr(sh->sh_head->shd_ipl);
    167 }
    168 #endif /* _LOCORE */
    169 #endif /* _KERNEL */
    170 #endif	/* _VAX_INTR_H */
    171