FreeBSD/Linux Kernel Cross Reference
sys/i386/i386/io.c
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/11.2/sys/i386/i386/io.c 331722 2018-03-29 02:50:57Z eadler $");
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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