125 lines
4.3 KiB
Groff
125 lines
4.3 KiB
Groff
.\" $NetBSD: isr_add.9,v 1.9 2008/04/30 13:10:59 martin Exp $
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.\"
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.\" Copyright (c) 1997 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Jeremy Cooper.
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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, this list of conditions and the following 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS BE
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.\" LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd May 21, 1997
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.Dt ISR_ADD 9 sun3
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.Os
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.Sh NAME
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.Nm isr_add ,
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.Nm isr_add_autovect ,
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.Nm isr_add_vectored ,
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.Nm isr_add_custom
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.Nd establish interrupt handler
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.Sh SYNOPSIS
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.In sun3/autoconf.h
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.Bd -literal
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typedef int (*isr_func_t)(void *);
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.Ed
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.Ft void
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.Fn isr_add_autovect "isr_func_t fun" "void *arg" "int level"
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.Ft void
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.Fn isr_add_vectored "isr_func_t fun" "void *arg" "int pri" "int vec"
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.Ft void
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.Fn isr_add_custom "int level" "void *fun"
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.Sh DESCRIPTION
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The
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.Nm
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functions establish interrupt handlers into the system interrupt dispatch table
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and are typically called from device drivers during the autoconfiguration
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process.
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.Pp
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There are two types of interrupts in the Motorola 68000 architecture,
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which differ in the way that an interrupt request is mapped to a dispatch
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function within the interrupt vector table.
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.Pp
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When the CPU detects an asserted signal on one of its interrupt request lines,
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it suspends normal instruction execution and begins an interrupt acknowledge
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cycle on the system bus.
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During this cycle the interrupting device directs how the CPU is to dispatch
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its interrupt request.
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.Pp
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If the interrupting device is integrated tightly with the system bus,
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it provides an 8-bit interrupt vector number to the CPU and a
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.Sy vectored
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interrupt occurs.
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This vector number points to a vector entry within the interrupt
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vector table to which instruction execution is immediately transfered.
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.Pp
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If the interrupting device cannot provide a vector number,
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it asserts a specialized bus line and an
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.Sy autovectored
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interrupt occurs.
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The vector number to use is determined by adding the interrupt priority
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.Pq 0\(en6
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to an autovector base
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.Pq typically Li 18 hexadecimal .
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.Pp
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.Bl -tag -width isr_add_autovec
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.It Fn isr_add_autovect
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Adds the function
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.Fa fun
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to the list of interrupt handlers to be called during an autovectored interrupt
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of priority
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.Fa level .
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The pointer
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.Fa arg
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is passed to the function as its first argument.
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.It Fn isr_add_vectored
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Adds the function
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.Fa fun
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to the list of interrupt handlers to be called during a vectored interrupts of
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priority
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.Fa pri
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at dispatch vector number
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.Fa vec .
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The pointer
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.Fa arg
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is passed to the function as its first argument.
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.It Fn isr_add_custom
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Establish function
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.Fa fun
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as the interrupt handler for vector
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.Fa level .
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The autovector base number is automatically added to
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.Fa level .
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.Pp
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.Fa fun
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is called directly as the dispatch handler and must handle all of the specifics
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of saving the processor state and returning from a processor exception.
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These requirements generally dictate that
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.Fa fun
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be written in assembler.
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.El
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.Sh CODE REFERENCES
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.Pa sys/arch/sun3/sun3/isr.c
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.Sh REFERENCES
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MC68030 User's Manual, Third edition, MC68030UM/AD Rev 2, Motorola Inc.
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.Sh BUGS
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There is no way to remove a handler once it has been added.
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