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128 lines
3.9 KiB
Groff
128 lines
3.9 KiB
Groff
.\" -*- nroff -*-
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.\"
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.\" Copyright (c) 2000 Alexander Langer
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.\"
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.\" All rights reserved.
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.\"
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.\" This program is free software.
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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 DEVELOPERS ``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 DEVELOPERS 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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.Dd February 13, 2018
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.Dt DECLARE_MODULE 9
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.Os
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.Sh NAME
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.Nm DECLARE_MODULE
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.Nd kernel module declaration macro
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.Sh SYNOPSIS
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.In sys/param.h
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.In sys/kernel.h
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.In sys/module.h
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.Fn DECLARE_MODULE "name" "moduledata_t data" "sub" "order"
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.Fn DECLARE_MODULE_TIED "name" "moduledata_t data" "sub" "order"
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.Sh DESCRIPTION
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The
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.Fn DECLARE_MODULE
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macro declares a generic kernel module.
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It is used to register the module with the system, using the
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.Fn SYSINIT
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macro.
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.Fn DECLARE_MODULE
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is usually used within other macros, such as
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.Xr DRIVER_MODULE 9 ,
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.Xr DEV_MODULE 9
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and
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.Xr SYSCALL_MODULE 9 .
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Of course, it can also be called directly, for example in
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order to implement dynamic sysctls.
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.Pp
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A module declared with
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.Fn DECLARE_MODULE_TIED
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will load only if the running kernel version
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(as specified by
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.Dv __FreeBSD_version )
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is identical to that on which it was built.
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This declaration should be used by modules which depend on interfaces beyond
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the stable kernel KBI (such as ABI emulators or hypervisors that rely on
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internal kernel structures).
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.Fn DECLARE_MODULE
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will behave like
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.Fn DECLARE_MODULE_TIED
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when compiled with modules built with the kernel.
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This allows locks and other synchronization primitives
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to be inlined safely.
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.Pp
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The arguments are:
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.Bl -tag -width indent
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.It Fa name
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The module name, which will be used in the
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.Fn SYSINIT
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call to identify the module.
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.It Fa data
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A
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.Vt moduledata_t
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structure, which contains two main items, the official name of the
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module name, which will be used in the
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.Vt module_t
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structure and a pointer to the event handler function of type
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.Vt modeventhand_t .
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.It Fa sub
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An argument directed to the
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.Fn SYSINIT
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macro.
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Valid values for this are contained in the
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.Vt sysinit_sub_id
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enumeration
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(see
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.In sys/kernel.h )
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and specify the type of system startup interfaces.
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The
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.Xr DRIVER_MODULE 9
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macro uses a value of
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.Dv SI_SUB_DRIVERS
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here for example, since these modules contain a driver for a device.
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For kernel modules that are loaded at runtime, a value of
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.Dv SI_SUB_EXEC
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is common.
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.It Fa order
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An argument for
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.Fn SYSINIT .
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It represents the KLDs order of initialization within the subsystem.
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Valid values are defined in the
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.Vt sysinit_elem_order
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enumeration
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.Pq In sys/kernel.h .
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.El
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.Sh SEE ALSO
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.Xr DEV_MODULE 9 ,
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.Xr DRIVER_MODULE 9 ,
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.Xr module 9 ,
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.Xr SYSCALL_MODULE 9
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.Pp
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.Pa /usr/include/sys/kernel.h ,
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.Pa /usr/share/examples/kld
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.Sh AUTHORS
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.An -nosplit
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This manual page was written by
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.An Alexander Langer Aq Mt alex@FreeBSD.org ,
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inspired by the KLD Facility Programming Tutorial by
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.An Andrew Reiter Aq Mt arr@watson.org .
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