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

     /*-
      * Copyright (c) 1997, Stefan Esser <se@freebsd.org>
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice unmodified, this list of conditions, and the following
     *    disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     *
     * $FreeBSD$
     */
    
    #ifndef _SYS_INTERRUPT_H_
    #define _SYS_INTERRUPT_H_
    
    #include <sys/_lock.h>
    #include <sys/_mutex.h>
    
    struct intr_event;
    struct intr_thread;
    struct trapframe;
    
    /*
     * Describe a hardware interrupt handler.
     *
     * Multiple interrupt handlers for a specific event can be chained
     * together.
     */
    struct intr_handler {
            driver_filter_t *ih_filter;     /* Filter function. */
            driver_intr_t   *ih_handler;    /* Handler function. */
            void            *ih_argument;   /* Argument to pass to handler. */
            int              ih_flags;
            const char      *ih_name;       /* Name of handler. */
            struct intr_event *ih_event;    /* Event we are connected to. */
            int              ih_need;       /* Needs service. */
            TAILQ_ENTRY(intr_handler) ih_next; /* Next handler for this event. */
            u_char           ih_pri;        /* Priority of this handler. */
            struct intr_thread *ih_thread;  /* Ithread for filtered handler. */
    };
    
    /* Interrupt handle flags kept in ih_flags */
    #define IH_EXCLUSIVE    0x00000002      /* Exclusive interrupt. */
    #define IH_ENTROPY      0x00000004      /* Device is a good entropy source. */
    #define IH_DEAD         0x00000008      /* Handler should be removed. */
    #define IH_MPSAFE       0x80000000      /* Handler does not need Giant. */
    
    /*
     * Describe an interrupt event.  An event holds a list of handlers.
     */
    struct intr_event {
            TAILQ_ENTRY(intr_event) ie_list;
            TAILQ_HEAD(, intr_handler) ie_handlers; /* Interrupt handlers. */
            char            ie_name[MAXCOMLEN]; /* Individual event name. */
            char            ie_fullname[MAXCOMLEN];
            struct mtx      ie_lock;
            void            *ie_source;     /* Cookie used by MD code. */
            struct intr_thread *ie_thread;  /* Thread we are connected to. */
            void            (*ie_enable)(void *);
            int             (*ie_assign_cpu)(void *, u_char);
    #ifdef INTR_FILTER
            void            (*ie_eoi)(void *);
            void            (*ie_disab)(void *);
    #endif
            int             ie_flags;
            int             ie_count;       /* Loop counter. */
            int             ie_warncnt;     /* Rate-check interrupt storm warns. */
            struct timeval  ie_warntm;
            u_char          ie_cpu;         /* CPU this event is bound to. */
    };
    
    /* Interrupt event flags kept in ie_flags. */
    #define IE_SOFT         0x000001        /* Software interrupt. */
    #define IE_ENTROPY      0x000002        /* Interrupt is an entropy source. */
    #define IE_ADDING_THREAD 0x000004       /* Currently building an ithread. */
    
    /* Flags to pass to sched_swi. */
    #define SWI_DELAY       0x2
    
    /*
     * Software interrupt numbers in priority order.  The priority determines
     * the priority of the corresponding interrupt thread.
     */
   #define SWI_TTY         0
   #define SWI_NET         1
   #define SWI_CAMBIO      2
   #define SWI_VM          3
   #define SWI_CLOCK       4
   #define SWI_TQ_FAST     5
   #define SWI_TQ          6
   #define SWI_TQ_GIANT    6
   
   extern struct   intr_event *tty_intr_event;
   extern struct   intr_event *clk_intr_event;
   extern void     *softclock_ih;
   extern void     *vm_ih;
   
   /* Counts and names for statistics (defined in MD code). */
   extern u_long   eintrcnt[];     /* end of intrcnt[] */
   extern char     eintrnames[];   /* end of intrnames[] */
   extern u_long   intrcnt[];      /* counts for for each device and stray */
   extern char     intrnames[];    /* string table containing device names */
   
   #ifdef DDB
   void    db_dump_intr_event(struct intr_event *ie, int handlers);
   #endif
   #ifdef INTR_FILTER
   int     intr_filter_loop(struct intr_event *ie, struct trapframe *frame, 
                            struct intr_thread **ithd);
   int     intr_event_handle(struct intr_event *ie, struct trapframe *frame);
   #endif
   u_char  intr_priority(enum intr_type flags);
   int     intr_event_add_handler(struct intr_event *ie, const char *name,
               driver_filter_t filter, driver_intr_t handler, void *arg, 
               u_char pri, enum intr_type flags, void **cookiep);      
   int     intr_event_bind(struct intr_event *ie, u_char cpu);
   #ifndef INTR_FILTER
   int     intr_event_create(struct intr_event **event, void *source,
               int flags, void (*enable)(void *),
               int (*assign_cpu)(void *, u_char), const char *fmt, ...)
               __printflike(6, 7);
   #else
   int     intr_event_create(struct intr_event **event, void *source,
               int flags, void (*enable)(void *), void (*eoi)(void *), 
               void (*disab)(void *), int (*assign_cpu)(void *, u_char),
               const char *fmt, ...)
               __printflike(8, 9);
   #endif
   int     intr_event_destroy(struct intr_event *ie);
   int     intr_event_remove_handler(void *cookie);
   #ifndef INTR_FILTER
   int     intr_event_schedule_thread(struct intr_event *ie);
   #else
   int     intr_event_schedule_thread(struct intr_event *ie,
               struct intr_thread *ithd);
   #endif
   void    *intr_handler_source(void *cookie);
   int     swi_add(struct intr_event **eventp, const char *name,
               driver_intr_t handler, void *arg, int pri, enum intr_type flags,
               void **cookiep);
   void    swi_sched(void *cookie, int flags);
   int     swi_remove(void *cookie);
   
   #endif

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