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("$FreeBSD$");
    #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>
    
    static struct intr_event *intr_events[NIRQ];
    static int intrcnt_tab[NIRQ];
    static int intrcnt_index = 0;
    static int last_printed = 0;
    
    void    arm_handler_execute(struct trapframe *, int);
    
    #ifdef INTR_FILTER
    static void
    intr_disab_eoi_src(void *arg)
    {
            uintptr_t nb;
    
            nb = (uintptr_t)arg;
            arm_mask_irq(nb);
    }
    
    static void
    intr_eoi_src(void *arg)
    {
            uintptr_t nb;
    
            nb = (uintptr_t)arg;
            arm_unmask_irq(nb);
    }
    
    #endif
    
    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) {
    #ifdef INTR_FILTER
                    error = intr_event_create(&event, (void *)irq, 0,
                        (void (*)(void *))arm_unmask_irq, intr_eoi_src,
                        intr_disab_eoi_src, NULL, "intr%d:", irq);
    #else
                    error = intr_event_create(&event, (void *)irq, 0,
                        (void (*)(void *))arm_unmask_irq, NULL, "intr%d:", irq);
    #endif
                   if (error)
                           return;
                   intr_events[irq] = event;
                   last_printed += 
                       snprintf(intrnames + last_printed,
                       MAXCOMLEN + 1,
                       "irq%d: %s", irq, name);
                   last_printed++;
                   intrcnt_tab[irq] = intrcnt_index;
                   intrcnt_index++;
                   
           }
           intr_event_add_handler(event, name, filt, hand, arg,
               intr_priority(flags), flags, cookiep);
   }
   
   int
   arm_remove_irqhandler(void *cookie)
   {
           return (intr_event_remove_handler(cookie));
   }
   
   void dosoftints(void);
   void
   dosoftints(void)
   {
   }
   
   void
   arm_handler_execute(struct trapframe *frame, int irqnb)
   {
           struct intr_event *event;
           struct thread *td = curthread;
   #ifdef INTR_FILTER
           int i;
   #else
           int i, thread, ret;
           struct intr_handler *ih;
   #endif
   
           PCPU_INC(cnt.v_intr);
           td->td_intr_nesting_level++;
           while ((i = arm_get_next_irq()) != -1) {
   #ifndef INTR_FILTER
                   arm_mask_irq(i);
   #endif
                   intrcnt[intrcnt_tab[i]]++;
                   event = intr_events[i];
                   if (!event || TAILQ_EMPTY(&event->ie_handlers)) {
   #ifdef INTR_FILTER
                           arm_mask_irq(i);
   #endif
                           continue;
                   }
   
   #ifdef INTR_FILTER
                   intr_event_handle(event, frame);
                   /* XXX: Log stray IRQs */
   #else
                   /* Execute fast handlers. */
                   ret = 0;
                   thread = 0;
                   TAILQ_FOREACH(ih, &event->ie_handlers, ih_next) {
                           if (ih->ih_filter == NULL)
                                   thread = 1;
                           else
                                   ret = ih->ih_filter(ih->ih_argument ?
                                       ih->ih_argument : frame);
                           /*
                            * Wrapper handler special case: see
                            * i386/intr_machdep.c::intr_execute_handlers()
                            */
                           if (!thread) {
                                   if (ret == FILTER_SCHEDULE_THREAD)
                                           thread = 1;
                           }
                   }
   
                   /* Schedule thread if needed. */
                   if (thread)
                           intr_event_schedule_thread(event);
                   else
                           arm_unmask_irq(i);
   #endif
           }
           td->td_intr_nesting_level--;
   }

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