1/*	$NetBSD: iopl.c,v 1.1 2008/01/04 15:37:11 yamt Exp $	*/
2
3/*-
4 * Copyright (c)2008 YAMAMOTO Takashi,
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30#ifndef lint
31__RCSID("$NetBSD: iopl.c,v 1.1 2008/01/04 15:37:11 yamt Exp $");
32#endif /* not lint */
33
34#include <sys/types.h>
35
36#include <machine/sysarch.h>
37
38#include <err.h>
39#include <signal.h>
40#include <setjmp.h>
41#include <stdbool.h>
42#include <stdint.h>
43#include <stdio.h>
44#include <stdlib.h>
45#include <string.h>
46#include <unistd.h>
47
48/* arbitrary port to test */
49#define	IO_TIMER1	0x40
50#define	TIMER_CNTR0	0
51#define	PORT	(IO_TIMER1+TIMER_CNTR0)
52
53static uint8_t
54inb(uint16_t port)
55{
56	uint8_t data;
57
58	__asm __volatile("inb %1, %0" : "=a"(data) : "id"(port));
59	return data;
60}
61
62sigjmp_buf env;
63int gotsig;
64
65static void
66sighandler(int sig)
67{
68
69	siglongjmp(env, sig);
70}
71
72static void
73try(const char *msg, bool success)
74{
75	int sig;
76
77	sig = sigsetjmp(env, 1);
78	if (sig == 0) {
79		inb(PORT);
80		if (!success) {
81			errx(EXIT_FAILURE, "%s: unexpected success of inb",
82			    msg);
83		}
84		return;
85	}
86	if (success) {
87		errx(EXIT_FAILURE, "%s: got signal %d\n", msg, sig);
88	}
89}
90
91int
92main(int argc, char *argv[])
93{
94	int ret;
95
96	signal(SIGSEGV, sighandler);
97
98	try("1", false);
99	sleep(1);
100
101	ret = i386_iopl(3);
102	if (ret == -1) {
103		err(EXIT_FAILURE, "iopl 1");
104	}
105
106	sleep(1);
107	try("2", true);
108	sleep(1);
109
110	ret = i386_iopl(0);
111	if (ret == -1) {
112		err(EXIT_FAILURE, "iopl 2");
113	}
114
115	sleep(1);
116	try("3", false);
117}
118