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/dev/io/iodev.c

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    1 /*-
    2  * Copyright (c) 2004 Mark R V Murray
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer
   10  *    in this position and unchanged.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
   16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   25  *
   26  */
   27 
   28 #include <sys/cdefs.h>
   29 __FBSDID("$FreeBSD: releng/8.0/sys/dev/io/iodev.c 181428 2008-08-08 13:43:56Z ed $");
   30 
   31 #include <sys/param.h>
   32 #include <sys/conf.h>
   33 #include <sys/fcntl.h>
   34 #include <sys/kernel.h>
   35 #include <sys/lock.h>
   36 #include <sys/malloc.h>
   37 #include <sys/module.h>
   38 #include <sys/mutex.h>
   39 #include <sys/proc.h>
   40 #include <sys/signalvar.h>
   41 #include <sys/systm.h>
   42 #include <sys/uio.h>
   43 
   44 #include <machine/specialreg.h>
   45 
   46 #include <vm/vm.h>
   47 #include <vm/pmap.h>
   48 
   49 #include <machine/iodev.h>
   50 
   51 static struct cdev *iodev;
   52 
   53 static struct cdevsw io_cdevsw = {
   54         .d_version =    D_VERSION,
   55         .d_open =       ioopen,
   56         .d_close =      ioclose,
   57         .d_name =       "io",
   58 };
   59 
   60 /* ARGSUSED */
   61 static int
   62 io_modevent(module_t mod __unused, int type, void *data __unused)
   63 {
   64         switch(type) {
   65         case MOD_LOAD:
   66                 if (bootverbose)
   67                         printf("io: <I/O>\n");
   68                 iodev = make_dev(&io_cdevsw, 0,
   69                         UID_ROOT, GID_WHEEL, 0600, "io");
   70                 break;
   71 
   72         case MOD_UNLOAD:
   73                 destroy_dev(iodev);
   74                 break;
   75 
   76         case MOD_SHUTDOWN:
   77                 break;
   78 
   79         default:
   80                 return(EOPNOTSUPP);
   81                 break;
   82 
   83         }
   84 
   85         return (0);
   86 }
   87 
   88 DEV_MODULE(io, io_modevent, NULL);
   89 MODULE_VERSION(io, 1);

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