/*- * Copyright (c) 1997 Berkeley Software Design, Inc. 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. Berkeley Software Design Inc's name may not be used to endorse or * promote products derived from this software without specific prior * written permission. * * THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN INC ``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 BERKELEY SOFTWARE DESIGN INC 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. * * From BSDI: intr.c,v 1.6.2.5 1999/07/06 19:16:52 cp Exp * $FreeBSD$ */ /* Interrupt thread code. */ #include #include #include #include #include #include #include #include struct int_entropy { struct proc *p; int irq; }; static u_int straycount[ICU_LEN]; static u_int glitchcount7; static u_int glitchcount15; #define MAX_STRAY_LOG 5 /* * Schedule a heavyweight interrupt process. This function is called * from the interrupt handlers Xintr. */ void sched_ithd(void *cookie) { int irq = (uintptr_t) cookie; /* IRQ we're handling */ struct ithd *ithd = ithds[irq]; /* and the process that does it */ int error, isr; /* This used to be in icu_vector.s */ /* * We count software interrupts when we process them. The * code here follows previous practice, but there's an * argument for counting hardware interrupts when they're * processed too. */ atomic_add_long(intr_countp[irq], 1); /* one more for this IRQ */ atomic_add_int(&cnt.v_intr, 1); /* one more global interrupt */ /* * Schedule the interrupt thread to run if needed and switch to it * if we schedule it if !cold. */ error = ithread_schedule(ithd, !cold); /* * Log stray interrupts. */ if (error == EINVAL) { /* Determine if it is a stray interrupt or simply a glitch */ if (irq == 7) { outb(IO_ICU1, OCW3_SEL); /* select IS register */ isr = inb(IO_ICU1); outb(IO_ICU1, OCW3_SEL | OCW3_RIS); /* reselect IIR */ if ((isr & 0x80) == 0) { glitchcount7++; return; } } if (irq == 15) { outb(IO_ICU2, OCW3_SEL); /* select IS register */ isr = inb(IO_ICU2); outb(IO_ICU2, OCW3_SEL | OCW3_RIS); /* reselect IIR */ if ((isr & 0x80) == 0) { glitchcount15++; return; } } if (straycount[irq] < MAX_STRAY_LOG) { printf("stray irq %d\n", irq); if (++straycount[irq] == MAX_STRAY_LOG) printf( "got %d stray irq %d's: not logging anymore\n", MAX_STRAY_LOG, irq); } } }