131 lines
4.8 KiB
C
131 lines
4.8 KiB
C
/*-
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* Copyright (c) 1997, Stefan Esser <se@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice unmodified, this list of conditions, and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _SYS_INTERRUPT_H_
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#define _SYS_INTERRUPT_H_
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#include <sys/_lock.h>
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#include <sys/_mutex.h>
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/*
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* Describe a hardware interrupt handler.
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*
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* Multiple interrupt handlers for a specific vector can be chained
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* together.
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*/
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struct intrhand {
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driver_intr_t *ih_handler; /* Handler function. */
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void *ih_argument; /* Argument to pass to handler. */
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int ih_flags;
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const char *ih_name; /* Name of handler. */
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struct ithd *ih_ithread; /* Ithread we are connected to. */
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int ih_need; /* Needs service. */
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TAILQ_ENTRY(intrhand) ih_next; /* Next handler for this vector. */
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u_char ih_pri; /* Priority of this handler. */
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};
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/* Interrupt handle flags kept in ih_flags */
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#define IH_FAST 0x00000001 /* Fast interrupt. */
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#define IH_EXCLUSIVE 0x00000002 /* Exclusive interrupt. */
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#define IH_ENTROPY 0x00000004 /* Device is a good entropy source. */
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#define IH_DEAD 0x00000008 /* Handler should be removed. */
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#define IH_MPSAFE 0x80000000 /* Handler does not need Giant. */
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/*
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* Describe an interrupt thread. There is one of these per interrupt vector.
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* Note that this actually describes an interrupt source. There may or may
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* not be an actual kernel thread attached to a given source.
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*/
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struct ithd {
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struct mtx it_lock;
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struct thread *it_td; /* Interrupt process. */
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LIST_ENTRY(ithd) it_list; /* All interrupt threads. */
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TAILQ_HEAD(, intrhand) it_handlers; /* Interrupt handlers. */
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struct ithd *it_interrupted; /* Who we interrupted. */
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void (*it_disable)(uintptr_t); /* Enable interrupt source. */
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void (*it_enable)(uintptr_t); /* Disable interrupt source. */
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void *it_md; /* Hook for MD interrupt code. */
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int it_flags; /* Interrupt-specific flags. */
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int it_need; /* Needs service. */
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uintptr_t it_vector;
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char it_name[MAXCOMLEN + 1];
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};
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/* Interrupt thread flags kept in it_flags */
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#define IT_SOFT 0x000001 /* Software interrupt. */
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#define IT_ENTROPY 0x000002 /* Interrupt is an entropy source. */
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#define IT_DEAD 0x000004 /* Thread is waiting to exit. */
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/* Flags to pass to sched_swi. */
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#define SWI_DELAY 0x2
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/*
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* Software interrupt numbers in priority order. The priority determines
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* the priority of the corresponding interrupt thread.
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*/
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#define SWI_TTY 0
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#define SWI_NET 1
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#define SWI_CAMBIO 2
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#define SWI_VM 3
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#define SWI_CLOCK 4
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#define SWI_TQ_FAST 5
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#define SWI_TQ 6
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#define SWI_TQ_GIANT 6
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extern struct ithd *tty_ithd;
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extern struct ithd *clk_ithd;
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extern void *net_ih;
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extern void *softclock_ih;
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extern void *vm_ih;
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/* Counts and names for statistics (defined in MD code). */
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extern u_long eintrcnt[]; /* end of intrcnt[] */
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extern char eintrnames[]; /* end of intrnames[] */
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extern u_long intrcnt[]; /* counts for for each device and stray */
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extern char intrnames[]; /* string table containing device names */
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#ifdef DDB
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void db_dump_ithread(struct ithd *ithd, int handlers);
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#endif
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int ithread_create(struct ithd **ithread, uintptr_t vector, int flags,
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void (*disable)(uintptr_t), void (*enable)(uintptr_t),
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const char *fmt, ...) __printflike(6, 7);
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int ithread_destroy(struct ithd *ithread);
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u_char ithread_priority(enum intr_type flags);
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int ithread_add_handler(struct ithd *ithread, const char *name,
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driver_intr_t handler, void *arg, u_char pri, enum intr_type flags,
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void **cookiep);
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int ithread_remove_handler(void *cookie);
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int ithread_schedule(struct ithd *ithread);
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int swi_add(struct ithd **ithdp, const char *name,
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driver_intr_t handler, void *arg, int pri, enum intr_type flags,
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void **cookiep);
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void swi_sched(void *cookie, int flags);
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#endif
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