/*      $NetBSD: devopen.c,v 1.1 2006/09/01 21:26:18 uwe 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 <lib/libsa/stand.h>
#include <lib/libkern/libkern.h>

#include "biosdisk.h"

#include "boot.h"
#include "bootinfo.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, "hd") == 0) {
                if (unit == 0 || unit == 1) {
                        *biosdev = 0x40 + (unit << 4);
                        return (0);
                }
        }
        return (ENXIO);
}

int
bios2dev(int biosdev, char **devname, u_int *unit, u_int sector, u_int *ptnp)
{

        *devname = "hd";
        *unit = (biosdev >> 4) & 1;
        *ptnp = biosdisk_findptn(biosdev, sector);
        return (0);
}

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)
{
        static struct btinfo_bootpath bibp;
        struct devsw *dp;
        char *devname;
        unsigned int dev, ctlr, unit, partition;
        int biosdev;
        int error;

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

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

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

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

        strncpy(bibp.bootpath, *file, sizeof(bibp.bootpath));
        BI_ADD(&bibp, BTINFO_BOOTPATH, sizeof(bibp));

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

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