sys/include/irq.h

   1 /*-
   2  * Copyright (c) 2005, Kohsuke Ohtani
   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, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the author nor the names of any co-contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #ifndef _IRQ_H
  31 #define _IRQ_H
  32
  33 #include <thread.h>
  34
  35 /*
  36  * IRQ descriptor
  37  */
  38 struct irq {
  39         int             vector;         /* Vector number */
  40         int             (*isr)(int);    /* Pointer to ISR */
  41         void            (*ist)(int);    /* Pointer to IST */
  42         u_int           count;          /* Interrupt count */
  43         int             ist_request;    /* Number of IST request */
  44         thread_t        thread;         /* Thread ID of IST */
  45         struct event    ist_event;      /* Event for IST */
  46 };
  47
  48 /*
  49  * Return values from ISR
  50  */
  51 #define INT_DONE        0       /* Success */
  52 #define INT_ERROR       1       /* Interrupt not handled */
  53 #define INT_CONTINUE    2       /* Continue processing (Request IST) */
  54
  55 extern void irq_init(void);
  56 extern int irq_attach(int irqno, int prio, int shared,
  57                       int (*isr)(int), void (*ist)(int));
  58 extern void irq_detach(int handle);
  59 extern void irq_lock(void);
  60 extern void irq_unlock(void);
  61 extern void irq_handler(int irqno);
  62
  63 #endif /* !_IRQ_H */