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devopen.c revision 1.4.16.1 
      1 /*	$NetBSD: devopen.c,v 1.4.16.1 2001/06/21 19:26:13 nathanw Exp $	 */
      2 
      3 /*
      4  * Copyright (c) 1996
      5  *	Matthias Drochner.  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  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed for the NetBSD Project
     18  *	by Matthias Drochner.
     19  * 4. The name of the author may not be used to endorse or promote products
     20  *    derived from this software without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     23  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     24  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     25  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     26  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     27  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     28  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     29  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     30  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     31  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     32  */
     33 
     34 
     35 #include <lib/libsa/stand.h>
     36 #include <lib/libkern/libkern.h>
     37 #include <lib/libsa/ufs.h>
     38 
     39 #include <libi386.h>
     40 #include <biosdisk.h>
     41 #include <dosfile.h>
     42 #include <bootinfo.h>
     43 
     44 struct devsw devsw[] = {
     45 	{"disk", biosdiskstrategy, biosdiskopen, biosdiskclose, biosdiskioctl},
     46 };
     47 int ndevs = sizeof(devsw) / sizeof(struct devsw);
     48 
     49 static struct fs_ops dosfs = {
     50 	dos_open, dos_close, dos_read, dos_write, dos_seek, dos_stat
     51 };
     52 static struct fs_ops ufsfs = {
     53 	ufs_open, ufs_close, ufs_read, ufs_write, ufs_seek, ufs_stat
     54 };
     55 
     56 struct fs_ops   file_system[] = {
     57 	{0},
     58 };
     59 int  nfsys = 1;
     60 
     61 static struct {
     62 	char           *name;
     63 	int             biosdev;
     64 }               biosdevtab[] = {
     65 	{
     66 		"fd", 0
     67 	},
     68 	{
     69 		"wd", 0x80
     70 	},
     71 	{
     72 		"sd", 0x80
     73 	},
     74 	{
     75 		"hd", 0x80
     76 	}
     77 };
     78 #define NUMBIOSDEVS (sizeof(biosdevtab) / sizeof(biosdevtab[0]))
     79 
     80 static int dev2bios __P((char *, unsigned int, int *));
     81 
     82 static int
     83 dev2bios(devname, unit, biosdev)
     84 	char           *devname;
     85 	unsigned int    unit;
     86 	int            *biosdev;
     87 {
     88 	int             i;
     89 
     90 	for (i = 0; i < NUMBIOSDEVS; i++)
     91 		if (!strcmp(devname, biosdevtab[i].name)) {
     92 			*biosdev = biosdevtab[i].biosdev + unit;
     93 			if (unit >= 4)	/* ??? */
     94 				return (EUNIT);
     95 			return (0);
     96 		}
     97 	return (ENXIO);
     98 }
     99 
    100 struct btinfo_bootpath bibp;
    101 
    102 int
    103 devopen(f, fname, file)
    104 	struct open_file *f;
    105 	const char     *fname;
    106 	char          **file;
    107 {
    108 	char           *devname;
    109 	char           *fsmode;
    110 	unsigned int    unit, partition;
    111 	int             biosdev;
    112 	int             error;
    113 	struct devsw   *dp;
    114 
    115 	if ((error = parsebootfile(fname, &fsmode, &devname, &unit,
    116 	    &partition, (const char **) file)))
    117 		return (error);
    118 
    119 	if (!strcmp(fsmode, "dos")) {
    120 		file_system[0] = dosfs;	/* structure assignment! */
    121 		f->f_flags |= F_NODEV;	/* handled by DOS */
    122 		return (0);
    123 	} else if (!strcmp(fsmode, "ufs")) {
    124 		if ((error = dev2bios(devname, unit, &biosdev)))
    125 			return (error);
    126 		file_system[0] = ufsfs;	/* structure assignment! */
    127 		dp = &devsw[0];	/* must be biosdisk */
    128 		f->f_dev = dp;
    129 
    130 		strncpy(bibp.bootpath, *file, sizeof(bibp.bootpath));
    131 		BI_ADD(&bibp, BTINFO_BOOTPATH, sizeof(bibp));
    132 
    133 		return (biosdiskopen(f, biosdev, partition));
    134 	} else {
    135 		printf("no file system\n");
    136 		return (ENXIO);
    137 	}
    138 	/* NOTREACHED */
    139 }
    140