/*      $NetBSD: devopen.c,v 1.2 2012/01/18 23:12:21 nonaka Exp $       */

/*-
 *  Copyright (c) 1993 John Brezak
 *  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.
 *  3. The name of the author may not be used to endorse or promote products
 *     derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR `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 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/param.h>
#include <sys/disklabel.h>

#include "boot.h"
#include "bootinfo.h"
#include "disk.h"
#include "unixdev.h"

static int dev2bios(char *devname, unsigned int unit, int *biosdev);
static int devlookup(char *d);

static int
dev2bios(char *devname, unsigned int unit, int *biosdev)
{

        if (strcmp(devname, devname_hd) == 0) {
                *biosdev = 0x80 + unit;
                return 0;
        } else if (strcmp(devname, devname_mmcd) == 0) {
                *biosdev = 0x00 + unit;
                return 0;
        }
        return ENXIO;
}

static int
devlookup(char *d)
{
        struct devsw *dp = devsw;
        int i;

        for (i = 0; i < ndevs; i++, dp++) {
                if ((dp->dv_name != NULL) && (strcmp(dp->dv_name, d) == 0)) {
                        return i;
                }
        }

        printf("No such device - Configured devices are:\n");
        for (dp = devsw, i = 0; i < ndevs; i++, dp++) {
                if (dp->dv_name != NULL) {
                        printf(" %s", dp->dv_name);
                }
        }
        printf("\n");
        return -1;
}

int
devopen(struct open_file *f, const char *fname, char **file)
{
        struct devsw *dp;
        char *fsname, *devname;
        u_int dev, unit, partition;
        int biosdev;
        int error;

#if defined(UNIX_DEBUG)
        printf("devopen: fname = %s\n", fname ? fname : "(null)");
#endif

        if ((error = parsebootfile(fname, &fsname, &devname, &unit, &partition,
            (const char **)file)) != 0) {
                return error;
        }

#if defined(UNIX_DEBUG)
        printf("devopen: devname = %s\n", devname);
#endif
        dev = devlookup(devname);
        if (dev == -1) {
#if defined(UNIX_DEBUG)
                printf("devopen: devlookup failed\n");
#endif
                return ENXIO;
        }

        dp = &devsw[dev];
        if (dp->dv_open == NULL) {
#if defined(UNIX_DEBUG)
                printf("devopen: dev->dv_open() == NULL\n");
#endif
                return ENODEV;
        }
        f->f_dev = dp;

        if (dev2bios(devname, unit, &biosdev) == 0) {
#if defined(UNIX_DEBUG)
                printf("devopen: bios disk\n");
#endif
                return unixopen(f, devname, unit, partition, *file);
        }

#if defined(UNIX_DEBUG)
        printf("devopen: dev->dv_open()\n");
#endif
        if ((error = (*dp->dv_open)(f, devname, unit, partition, *file)) == 0) {
#if defined(UNIX_DEBUG)
                printf("devopen: dev->dv_open() opened\n");
#endif
                return 0;
        }

        printf("%s%d%c:%s : %s\n", dp->dv_name, unit, partition + 'a', *file,
            strerror(error));
        return error;
}