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/i386/isa/ithread.c

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    1 /*-
    2  * Copyright (c) 1997 Berkeley Software Design, Inc. All rights reserved.
    3  *
    4  * Redistribution and use in source and binary forms, with or without
    5  * modification, are permitted provided that the following conditions
    6  * are met:
    7  * 1. Redistributions of source code must retain the above copyright
    8  *    notice, this list of conditions and the following disclaimer.
    9  * 2. Redistributions in binary form must reproduce the above copyright
   10  *    notice, this list of conditions and the following disclaimer in the
   11  *    documentation and/or other materials provided with the distribution.
   12  * 3. Berkeley Software Design Inc's name may not be used to endorse or
   13  *    promote products derived from this software without specific prior
   14  *    written permission.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN INC ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL BERKELEY SOFTWARE DESIGN INC BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  *
   28  *      From BSDI: intr.c,v 1.6.2.5 1999/07/06 19:16:52 cp Exp
   29  * $FreeBSD: releng/5.1/sys/i386/isa/ithread.c 89979 2002-01-30 12:23:49Z bde $
   30  */
   31 
   32 /* Interrupt thread code. */
   33 
   34 #include <sys/param.h>
   35 #include <sys/bus.h>
   36 #include <sys/interrupt.h>
   37 #include <sys/systm.h>
   38 #include <sys/vmmeter.h>
   39 
   40 #include <i386/isa/icu.h>
   41 #include <i386/isa/intr_machdep.h>
   42 
   43 struct int_entropy {
   44         struct proc *p;
   45         int irq;
   46 };
   47 
   48 static u_int straycount[ICU_LEN];
   49 
   50 #define MAX_STRAY_LOG   5
   51 
   52 /*
   53  * Schedule a heavyweight interrupt process.  This function is called
   54  * from the interrupt handlers Xintr<num>.
   55  */
   56 void
   57 sched_ithd(void *cookie)
   58 {
   59         int irq = (int) cookie;         /* IRQ we're handling */
   60         struct ithd *ithd = ithds[irq]; /* and the process that does it */
   61         int error;
   62 
   63         /* This used to be in icu_vector.s */
   64         /*
   65          * We count software interrupts when we process them.  The
   66          * code here follows previous practice, but there's an
   67          * argument for counting hardware interrupts when they're
   68          * processed too.
   69          */
   70         atomic_add_long(intr_countp[irq], 1); /* one more for this IRQ */
   71         atomic_add_int(&cnt.v_intr, 1); /* one more global interrupt */
   72 
   73         /*
   74          * Schedule the interrupt thread to run if needed and switch to it
   75          * if we schedule it if !cold.
   76          */
   77         error = ithread_schedule(ithd, !cold);
   78 
   79         /*
   80          * Log stray interrupts.
   81          */
   82         if (error == EINVAL)
   83                 if (straycount[irq] < MAX_STRAY_LOG) {
   84                         printf("stray irq %d\n", irq);
   85                         if (++straycount[irq] == MAX_STRAY_LOG)
   86                                 printf(
   87                             "got %d stray irq %d's: not logging anymore\n",
   88                                     MAX_STRAY_LOG, irq);
   89                 }
   90 }

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