FreeBSD/Linux Kernel Cross Reference
sys/arm/arm/intr.c

     /*      $NetBSD: intr.c,v 1.12 2003/07/15 00:24:41 lukem Exp $  */
     
     /*-
      * Copyright (c) 2004 Olivier Houchard.
      * Copyright (c) 1994-1998 Mark Brinicombe.
      * 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, 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.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by Mark Brinicombe
     *      for the NetBSD Project.
     * 4. The name of the company nor the name of the author may be used to
     *    endorse or promote products derived from this software without specific
     *    prior written permission.
     *
     * 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 OR CONTRIBUTORS 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.
     *
     * Soft interrupt and other generic interrupt functions.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/10.0/sys/arm/arm/intr.c 246000 2013-01-27 20:16:50Z ian $");
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/syslog.h>
    #include <sys/malloc.h>
    #include <sys/proc.h>
    #include <sys/bus.h>
    #include <sys/interrupt.h>
    #include <sys/conf.h>
    #include <machine/atomic.h>
    #include <machine/intr.h>
    #include <machine/cpu.h>
    
    #define INTRNAME_LEN    (MAXCOMLEN + 1)
    
    typedef void (*mask_fn)(void *);
    
    static struct intr_event *intr_events[NIRQ];
    
    void    arm_handler_execute(struct trapframe *, int);
    
    void (*arm_post_filter)(void *) = NULL;
    
    /*
     * Pre-format intrnames into an array of fixed-size strings containing spaces.
     * This allows us to avoid the need for an intermediate table of indices into
     * the names and counts arrays, while still meeting the requirements and
     * assumptions of vmstat(8) and the kdb "show intrcnt" command, the two
     * consumers of this data.
     */
    void
    arm_intrnames_init(void)
    {
            int i;
    
            for (i = 0; i < NIRQ; ++i) {
                    snprintf(&intrnames[i * INTRNAME_LEN], INTRNAME_LEN, "%-*s",
                        INTRNAME_LEN - 1, "");
            }
    }
    
    void
    arm_setup_irqhandler(const char *name, driver_filter_t *filt,
        void (*hand)(void*), void *arg, int irq, int flags, void **cookiep)
    {
            struct intr_event *event;
            int error;
    
            if (irq < 0 || irq >= NIRQ)
                    return;
            event = intr_events[irq];
            if (event == NULL) {
                    error = intr_event_create(&event, (void *)irq, 0, irq,
                        (mask_fn)arm_mask_irq, (mask_fn)arm_unmask_irq,
                        arm_post_filter, NULL, "intr%d:", irq);
                    if (error)
                            return;
                    intr_events[irq] = event;
                    snprintf(&intrnames[irq * INTRNAME_LEN], INTRNAME_LEN, 
                        "irq%d: %-*s", irq, INTRNAME_LEN - 1, name);
           }
           intr_event_add_handler(event, name, filt, hand, arg,
               intr_priority(flags), flags, cookiep);
   }
   
   int
   arm_remove_irqhandler(int irq, void *cookie)
   {
           struct intr_event *event;
           int error;
   
           event = intr_events[irq];
           arm_mask_irq(irq);
           
           error = intr_event_remove_handler(cookie);
   
           if (!TAILQ_EMPTY(&event->ie_handlers))
                   arm_unmask_irq(irq);
           return (error);
   }
   
   void dosoftints(void);
   void
   dosoftints(void)
   {
   }
   
   void
   arm_handler_execute(struct trapframe *frame, int irqnb)
   {
           struct intr_event *event;
           int i;
   
           PCPU_INC(cnt.v_intr);
           i = -1;
           while ((i = arm_get_next_irq(i)) != -1) {
                   intrcnt[i]++;
                   event = intr_events[i];
                   if (intr_event_handle(event, frame) != 0) {
                           /* XXX: Log stray IRQs */
                           arm_mask_irq(i);
                   }
           }
   }

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