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118 lines
2.7 KiB
C
118 lines
2.7 KiB
C
/* $NetBSD: iopl.c,v 1.2 2008/01/04 16:18:52 yamt Exp $ */
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/*-
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* Copyright (c)2008 YAMAMOTO Takashi,
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__RCSID("$NetBSD: iopl.c,v 1.2 2008/01/04 16:18:52 yamt Exp $");
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#endif /* not lint */
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#include <sys/types.h>
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#include <machine/sysarch.h>
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#include <err.h>
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#include <signal.h>
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#include <setjmp.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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/* arbitrary port to test */
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#define IO_TIMER1 0x40
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#define TIMER_CNTR0 0
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#define PORT (IO_TIMER1+TIMER_CNTR0)
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static uint8_t
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inb(uint16_t port)
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{
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uint8_t data;
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__asm __volatile("inb %1, %0" : "=a"(data) : "id"(port));
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return data;
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}
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sigjmp_buf env;
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int gotsig;
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static void
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sighandler(int sig)
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{
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siglongjmp(env, sig);
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}
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static void
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try(const char *msg, bool success)
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{
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int sig;
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sig = sigsetjmp(env, 1);
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if (sig == 0) {
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inb(PORT);
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if (!success) {
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errx(EXIT_FAILURE, "%s: unexpected success of inb",
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msg);
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}
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return;
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}
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if (success) {
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errx(EXIT_FAILURE, "%s: got signal %d\n", msg, sig);
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}
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}
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int
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main(int argc, char *argv[])
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{
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int ret;
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signal(SIGSEGV, sighandler);
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try("1", false);
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sleep(1);
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ret = i386_iopl(3);
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if (ret == -1) {
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err(EXIT_FAILURE, "iopl 1");
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}
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sleep(1);
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try("2", true);
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sleep(1);
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ret = i386_iopl(0);
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if (ret == -1) {
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err(EXIT_FAILURE, "iopl 2");
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}
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sleep(1);
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try("3", false);
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}
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