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/amd64/amd64/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/6.2/sys/amd64/amd64/io.c 132956 2004-08-01 11:40:54Z markm $");
   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/proc.h>
   37 #include <sys/signalvar.h>
   38 #include <sys/systm.h>
   39 
   40 #include <machine/db_machdep.h>
   41 #include <machine/frame.h>
   42 #include <machine/psl.h>
   43 #include <machine/specialreg.h>
   44 
   45 #include <vm/vm.h>
   46 #include <vm/pmap.h>
   47 
   48 #include <machine/iodev.h>
   49 
   50 /* ARGSUSED */
   51 int
   52 ioopen(struct cdev *dev __unused, int flags __unused, int fmt __unused,
   53     struct thread *td)
   54 {
   55         int error;
   56 
   57         error = suser(td);
   58         if (error != 0)
   59                 return (error);
   60         error = securelevel_gt(td->td_ucred, 0);
   61         if (error != 0)
   62                 return (error);
   63 
   64         td->td_frame->tf_rflags |= PSL_IOPL;
   65 
   66         return (0);
   67 }
   68 
   69 /* ARGSUSED */
   70 int
   71 ioclose(struct cdev *dev __unused, int flags __unused, int fmt __unused,
   72     struct thread *td)
   73 {
   74         td->td_frame->tf_rflags &= ~PSL_IOPL;
   75 
   76         return (0);
   77 }

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