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/i386/i386/io.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 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/8.0/sys/i386/i386/io.c 164033 2006-11-06 13:42:10Z rwatson $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/conf.h>
   32 #include <sys/fcntl.h>
   33 #include <sys/lock.h>
   34 #include <sys/malloc.h>
   35 #include <sys/mutex.h>
   36 #include <sys/priv.h>
   37 #include <sys/proc.h>
   38 #include <sys/signalvar.h>
   39 #include <sys/systm.h>
   40 
   41 #include <machine/db_machdep.h>
   42 #include <machine/frame.h>
   43 #include <machine/psl.h>
   44 #include <machine/specialreg.h>
   45 
   46 #include <vm/vm.h>
   47 #include <vm/pmap.h>
   48 
   49 #include <machine/iodev.h>
   50 
   51 /* ARGSUSED */
   52 int
   53 ioopen(struct cdev *dev __unused, int flags __unused, int fmt __unused,
   54     struct thread *td)
   55 {
   56         int error;
   57 
   58         error = priv_check(td, PRIV_IO);
   59         if (error != 0)
   60                 return (error);
   61         error = securelevel_gt(td->td_ucred, 0);
   62         if (error != 0)
   63                 return (error);
   64 
   65         td->td_frame->tf_eflags |= PSL_IOPL;
   66 
   67         return (0);
   68 }
   69 
   70 /* ARGSUSED */
   71 int
   72 ioclose(struct cdev *dev __unused, int flags __unused, int fmt __unused,
   73     struct thread *td)
   74 {
   75         td->td_frame->tf_eflags &= ~PSL_IOPL;
   76 
   77         return (0);
   78 }

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