/*      $NetBSD: ioperm.c,v 1.2 2008/01/04 16:18:52 yamt Exp $  */

/*-
 * Copyright (c)2008 YAMAMOTO Takashi,
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: ioperm.c,v 1.2 2008/01/04 16:18:52 yamt Exp $");
#endif /* not lint */

#include <err.h>
#include <signal.h>
#include <setjmp.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

int i386_get_ioperm(unsigned long *);
int i386_set_ioperm(unsigned long *);

/* arbitrary port to test */
#define IO_TIMER1       0x40
#define TIMER_CNTR0     0
#define PORT    (IO_TIMER1+TIMER_CNTR0)

static uint8_t
inb(uint16_t port)
{
        uint8_t data;

        __asm __volatile("inb %1, %0" : "=a"(data) : "id"(port));
        return data;
}

sigjmp_buf env;
int gotsig;

static void
sighandler(int sig)
{

        siglongjmp(env, sig);
}

static void
try(const char *msg, bool success)
{
        int sig;

        sig = sigsetjmp(env, 1);
        if (sig == 0) {
                inb(PORT);
                if (!success) {
                        errx(EXIT_FAILURE, "%s: unexpected success of inb",
                            msg);
                }
                return;
        }
        if (success) {
                errx(EXIT_FAILURE, "%s: got signal %d\n", msg, sig);
        }
}

int
main(int argc, char *argv[])
{
        unsigned long buf[32];
        unsigned long buf2[32];
        int ret;
        int i;

        ret = i386_get_ioperm(buf);
        if (ret == -1) {
                err(EXIT_FAILURE, "get_ioperm 1");
        }
        for (i = 0; i < __arraycount(buf); i++) {
                if (buf[i] != 0xffffffff) {
                        errx(EXIT_FAILURE, "buf[%d] == 0x%lx", i, buf[i]);
                }
        }

        signal(SIGSEGV, sighandler);

        try("1", false);
        sleep(1);

        memset(buf2, 0x00, sizeof(buf2));
        strcpy((char *)buf2, "foobarbaz");
        buf2[PORT / 8 / sizeof(unsigned long)] &=
            ~(1 << (PORT % (8 * sizeof(unsigned long))));
        ret = i386_set_ioperm(buf2);
        if (ret == -1) {
                err(EXIT_FAILURE, "set_ioperm 1");
        }
        ret = i386_get_ioperm(buf);
        if (ret == -1) {
                err(EXIT_FAILURE, "get_ioperm 2");
        }
        if (memcmp(buf, buf2, sizeof(buf))) {
                errx(EXIT_FAILURE, "iomap mismatch");
        }

        sleep(1);
        try("2", true);
        sleep(1);

        buf2[PORT / 8 / sizeof(unsigned long)] |=
            (1 << (PORT % (8 * sizeof(unsigned long))));
        ret = i386_set_ioperm(buf2);
        if (ret == -1) {
                err(EXIT_FAILURE, "set_ioperm 3");
        }

        sleep(1);
        try("3", false);
}