The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/interrupt.h

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    1 /*-
    2  * Copyright (c) 1997, Stefan Esser <se@freebsd.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice unmodified, this list of conditions, and the following
   10  *    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  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   25  *
   26  * $FreeBSD$
   27  */
   28 
   29 #ifndef _SYS_INTERRUPT_H_
   30 #define _SYS_INTERRUPT_H_
   31 
   32 #include <sys/_lock.h>
   33 #include <sys/_mutex.h>
   34 
   35 struct intr_event;
   36 struct intr_thread;
   37 struct trapframe;
   38 
   39 /*
   40  * Describe a hardware interrupt handler.
   41  *
   42  * Multiple interrupt handlers for a specific event can be chained
   43  * together.
   44  */
   45 struct intr_handler {
   46         driver_filter_t *ih_filter;     /* Filter function. */
   47         driver_intr_t   *ih_handler;    /* Handler function. */
   48         void            *ih_argument;   /* Argument to pass to handler. */
   49         int              ih_flags;
   50         const char      *ih_name;       /* Name of handler. */
   51         struct intr_event *ih_event;    /* Event we are connected to. */
   52         int              ih_need;       /* Needs service. */
   53         TAILQ_ENTRY(intr_handler) ih_next; /* Next handler for this event. */
   54         u_char           ih_pri;        /* Priority of this handler. */
   55         struct intr_thread *ih_thread;  /* Ithread for filtered handler. */
   56 };
   57 
   58 /* Interrupt handle flags kept in ih_flags */
   59 #define IH_EXCLUSIVE    0x00000002      /* Exclusive interrupt. */
   60 #define IH_ENTROPY      0x00000004      /* Device is a good entropy source. */
   61 #define IH_DEAD         0x00000008      /* Handler should be removed. */
   62 #define IH_MPSAFE       0x80000000      /* Handler does not need Giant. */
   63 
   64 /*
   65  * Describe an interrupt event.  An event holds a list of handlers.
   66  */
   67 struct intr_event {
   68         TAILQ_ENTRY(intr_event) ie_list;
   69         TAILQ_HEAD(, intr_handler) ie_handlers; /* Interrupt handlers. */
   70         char            ie_name[MAXCOMLEN]; /* Individual event name. */
   71         char            ie_fullname[MAXCOMLEN];
   72         struct mtx      ie_lock;
   73         void            *ie_source;     /* Cookie used by MD code. */
   74         struct intr_thread *ie_thread;  /* Thread we are connected to. */
   75         void            (*ie_enable)(void *);
   76         int             (*ie_assign_cpu)(void *, u_char);
   77 #ifdef INTR_FILTER
   78         void            (*ie_eoi)(void *);
   79         void            (*ie_disab)(void *);
   80 #endif
   81         int             ie_flags;
   82         int             ie_count;       /* Loop counter. */
   83         int             ie_warncnt;     /* Rate-check interrupt storm warns. */
   84         struct timeval  ie_warntm;
   85         u_char          ie_cpu;         /* CPU this event is bound to. */
   86 };
   87 
   88 /* Interrupt event flags kept in ie_flags. */
   89 #define IE_SOFT         0x000001        /* Software interrupt. */
   90 #define IE_ENTROPY      0x000002        /* Interrupt is an entropy source. */
   91 #define IE_ADDING_THREAD 0x000004       /* Currently building an ithread. */
   92 
   93 /* Flags to pass to sched_swi. */
   94 #define SWI_DELAY       0x2
   95 
   96 /*
   97  * Software interrupt numbers in priority order.  The priority determines
   98  * the priority of the corresponding interrupt thread.
   99  */
  100 #define SWI_TTY         0
  101 #define SWI_NET         1
  102 #define SWI_CAMBIO      2
  103 #define SWI_VM          3
  104 #define SWI_CLOCK       4
  105 #define SWI_TQ_FAST     5
  106 #define SWI_TQ          6
  107 #define SWI_TQ_GIANT    6
  108 
  109 extern struct   intr_event *tty_intr_event;
  110 extern struct   intr_event *clk_intr_event;
  111 extern void     *softclock_ih;
  112 extern void     *vm_ih;
  113 
  114 /* Counts and names for statistics (defined in MD code). */
  115 extern u_long   eintrcnt[];     /* end of intrcnt[] */
  116 extern char     eintrnames[];   /* end of intrnames[] */
  117 extern u_long   intrcnt[];      /* counts for for each device and stray */
  118 extern char     intrnames[];    /* string table containing device names */
  119 
  120 #ifdef DDB
  121 void    db_dump_intr_event(struct intr_event *ie, int handlers);
  122 #endif
  123 #ifdef INTR_FILTER
  124 int     intr_filter_loop(struct intr_event *ie, struct trapframe *frame, 
  125                          struct intr_thread **ithd);
  126 int     intr_event_handle(struct intr_event *ie, struct trapframe *frame);
  127 #endif
  128 u_char  intr_priority(enum intr_type flags);
  129 int     intr_event_add_handler(struct intr_event *ie, const char *name,
  130             driver_filter_t filter, driver_intr_t handler, void *arg, 
  131             u_char pri, enum intr_type flags, void **cookiep);      
  132 int     intr_event_bind(struct intr_event *ie, u_char cpu);
  133 #ifndef INTR_FILTER
  134 int     intr_event_create(struct intr_event **event, void *source,
  135             int flags, void (*enable)(void *),
  136             int (*assign_cpu)(void *, u_char), const char *fmt, ...)
  137             __printflike(6, 7);
  138 #else
  139 int     intr_event_create(struct intr_event **event, void *source,
  140             int flags, void (*enable)(void *), void (*eoi)(void *), 
  141             void (*disab)(void *), int (*assign_cpu)(void *, u_char),
  142             const char *fmt, ...)
  143             __printflike(8, 9);
  144 #endif
  145 int     intr_event_destroy(struct intr_event *ie);
  146 int     intr_event_remove_handler(void *cookie);
  147 #ifndef INTR_FILTER
  148 int     intr_event_schedule_thread(struct intr_event *ie);
  149 #else
  150 int     intr_event_schedule_thread(struct intr_event *ie,
  151             struct intr_thread *ithd);
  152 #endif
  153 void    *intr_handler_source(void *cookie);
  154 int     swi_add(struct intr_event **eventp, const char *name,
  155             driver_intr_t handler, void *arg, int pri, enum intr_type flags,
  156             void **cookiep);
  157 void    swi_sched(void *cookie, int flags);
  158 int     swi_remove(void *cookie);
  159 
  160 #endif

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