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intr.h revision 1.26 
      1 /* 	$NetBSD: intr.h,v 1.26 2008/02/03 08:32:25 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_SCHED	0x18	/* clock */
     46 #define IPL_VM		0x17	/* memory allocation */
     47 
     48 /* Software interrupt levels are 0 (0x00) thru 15 (0x0f)
     49  */
     50 #define IPL_SOFTDDB	0x0f	/* used by DDB on VAX */
     51 #define IPL_SOFTSERIAL	0x0d	/* soft serial */
     52 #define IPL_SOFTNET	0x0c	/* soft network */
     53 #define IPL_SOFTBIO	0x0b	/* soft bio */
     54 #define IPL_SOFTCLOCK	0x08
     55 #define IPL_NONE	0x00
     56 
     57 /* vax weirdness
     58  */
     59 #define IPL_UBA		IPL_VM	/* unibus adapters */
     60 #define IPL_CONSMEDIA	IPL_VM	/* console media */
     61 
     62 /* Misc
     63  */
     64 
     65 #define IPL_LEVELS	32
     66 
     67 #define IST_UNUSABLE	-1	/* interrupt cannot be used */
     68 #define IST_NONE	0	/* none (dummy) */
     69 #define IST_PULSE	1	/* pulsed */
     70 #define IST_EDGE	2	/* edge-triggered */
     71 #define IST_LEVEL	3	/* level-triggered */
     72 
     73 
     74 #ifdef _KERNEL
     75 typedef int ipl_t;
     76 
     77 static inline void
     78 _splset(ipl_t ipl)
     79 {
     80 	mtpr(ipl, PR_IPL);
     81 }
     82 
     83 static inline ipl_t
     84 _splget(void)
     85 {
     86 	return mfpr(PR_IPL);
     87 }
     88 
     89 static inline ipl_t
     90 splx(ipl_t new_ipl)
     91 {
     92 	ipl_t old_ipl = _splget();
     93 	_splset(new_ipl);
     94 	return old_ipl;
     95 }
     96 
     97 typedef struct {
     98 	uint8_t _ipl;
     99 } ipl_cookie_t;
    100 
    101 static inline ipl_cookie_t
    102 makeiplcookie(ipl_t ipl)
    103 {
    104 	return (ipl_cookie_t){._ipl = (uint8_t)ipl};
    105 }
    106 
    107 static inline int
    108 splraiseipl(ipl_cookie_t icookie)
    109 {
    110 	ipl_t newipl = icookie._ipl;
    111 	ipl_t oldipl;
    112 
    113 	oldipl = _splget();
    114 	if (newipl > oldipl) {
    115 		_splset(newipl);
    116 	}
    117 	return oldipl;
    118 }
    119 
    120 #define _setsirr(reg)	mtpr((reg), PR_SIRR)
    121 
    122 #define spl0()		_splset(IPL_NONE)		/* IPL00 */
    123 #define splddb()	splraiseipl(makeiplcookie(IPL_SOFTDDB)) /* IPL0F */
    124 #define splconsmedia()	splraiseipl(makeiplcookie(IPL_CONSMEDIA)) /* IPL14 */
    125 
    126 #include <sys/spl.h>
    127 
    128 /* These are better to use when playing with VAX buses */
    129 #define	spluba()	splraiseipl(makeiplcookie(IPL_UBA)) /* IPL17 */
    130 #define spl4()		splx(0x14)
    131 #define spl5()		splx(0x15)
    132 #define spl6()		splx(0x16)
    133 #define spl7()		splx(0x17)
    134 
    135 /* schedule software interrupts
    136  */
    137 #define setsoftddb()	_setsirr(IPL_SOFTDDB)
    138 #define setsoftserial()	_setsirr(IPL_SOFTSERIAL)
    139 #define setsoftnet()	_setsirr(IPL_SOFTNET)
    140 
    141 #if !defined(_LOCORE)
    142 LIST_HEAD(sh_head, softintr_handler);
    143 
    144 struct softintr_head {
    145 	int shd_ipl;
    146 	struct sh_head shd_intrs;
    147 };
    148 
    149 struct softintr_handler {
    150 	struct softintr_head *sh_head;
    151 	LIST_ENTRY(softintr_handler) sh_link;
    152 	void (*sh_func)(void *);
    153 	void *sh_arg;
    154 	int sh_pending;
    155 };
    156 
    157 extern void *softintr_establish(int, void (*)(void *), void *);
    158 extern void softintr_disestablish(void *);
    159 
    160 static __inline void
    161 softintr_schedule(void *arg)
    162 {
    163 	struct softintr_handler * const sh = arg;
    164 	sh->sh_pending = 1;
    165 	_setsirr(sh->sh_head->shd_ipl);
    166 }
    167 #endif /* _LOCORE */
    168 #endif /* _KERNEL */
    169 #endif	/* _VAX_INTR_H */
    170