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/9.0/sys/i386/i386/io.c 207329 2010-04-28 15:38:01Z attilio $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/proc.h>
   32 
   33 #include <machine/frame.h>
   34 #include <machine/iodev.h>
   35 #include <machine/psl.h>
   36 
   37 int
   38 iodev_open(struct thread *td)
   39 {
   40 
   41         td->td_frame->tf_eflags |= PSL_IOPL;
   42         return (0);
   43 }
   44 
   45 int
   46 iodev_close(struct thread *td)
   47 {
   48 
   49         td->td_frame->tf_eflags &= ~PSL_IOPL;
   50         return (0);
   51 }
   52 
   53 /* ARGSUSED */
   54 int
   55 iodev_ioctl(u_long cmd __unused, caddr_t data __unused)
   56 {
   57 
   58         return (ENOIOCTL);
   59 }

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