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devopen.c revision 1.8 
      1 /*	$NetBSD: devopen.c,v 1.8 2005/06/22 20:36:17 junyoung 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  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 
     29 #include <lib/libsa/stand.h>
     30 #include <lib/libkern/libkern.h>
     31 #include <lib/libsa/ufs.h>
     32 
     33 #include <libi386.h>
     34 #include <biosdisk.h>
     35 #include <dosfile.h>
     36 #include <bootinfo.h>
     37 
     38 struct devsw devsw[] = {
     39 	{"disk", biosdisk_strategy, biosdisk_open, biosdisk_close, biosdisk_ioctl},
     40 };
     41 int ndevs = sizeof(devsw) / sizeof(struct devsw);
     42 
     43 static struct fs_ops dosfs = {
     44 	dos_open, dos_close, dos_read, dos_write, dos_seek, dos_stat
     45 };
     46 static struct fs_ops ufsfs = {
     47 	ufs_open, ufs_close, ufs_read, ufs_write, ufs_seek, ufs_stat
     48 };
     49 
     50 struct fs_ops   file_system[] = {
     51 	{0},
     52 };
     53 int  nfsys = 1;
     54 
     55 static struct {
     56 	char           *name;
     57 	int             biosdev;
     58 }               biosdevtab[] = {
     59 	{
     60 		"fd", 0
     61 	},
     62 	{
     63 		"wd", 0x80
     64 	},
     65 	{
     66 		"sd", 0x80
     67 	},
     68 	{
     69 		"hd", 0x80
     70 	}
     71 };
     72 #define NUMBIOSDEVS (sizeof(biosdevtab) / sizeof(biosdevtab[0]))
     73 
     74 static int dev2bios __P((char *, unsigned int, int *));
     75 
     76 static int
     77 dev2bios(devname, unit, biosdev)
     78 	char           *devname;
     79 	unsigned int    unit;
     80 	int            *biosdev;
     81 {
     82 	unsigned             i;
     83 
     84 	for (i = 0; i < NUMBIOSDEVS; i++)
     85 		if (!strcmp(devname, biosdevtab[i].name)) {
     86 			*biosdev = biosdevtab[i].biosdev + unit;
     87 			if (unit >= 4)	/* ??? */
     88 				return (EUNIT);
     89 			return (0);
     90 		}
     91 	return (ENXIO);
     92 }
     93 
     94 struct btinfo_bootpath bibp;
     95 
     96 int
     97 devopen(f, fname, file)
     98 	struct open_file *f;
     99 	const char     *fname;
    100 	char          **file;
    101 {
    102 	char           *devname;
    103 	char           *fsmode;
    104 	unsigned int    unit, partition;
    105 	int             biosdev;
    106 	int             error;
    107 	struct devsw   *dp;
    108 
    109 	if ((error = parsebootfile(fname, &fsmode, &devname, &unit,
    110 	    &partition, (const char **) file)))
    111 		return (error);
    112 
    113 	if (!strcmp(fsmode, "dos")) {
    114 		file_system[0] = dosfs;	/* structure assignment! */
    115 		f->f_flags |= F_NODEV;	/* handled by DOS */
    116 		return (0);
    117 	} else if (!strcmp(fsmode, "ufs")) {
    118 		if ((error = dev2bios(devname, unit, &biosdev)))
    119 			return (error);
    120 		file_system[0] = ufsfs;	/* structure assignment! */
    121 		dp = &devsw[0];	/* must be biosdisk */
    122 		f->f_dev = dp;
    123 
    124 		strncpy(bibp.bootpath, *file, sizeof(bibp.bootpath));
    125 		BI_ADD(&bibp, BTINFO_BOOTPATH, sizeof(bibp));
    126 
    127 		return (biosdisk_open(f, biosdev, partition));
    128 	} else {
    129 		printf("no file system\n");
    130 		return (ENXIO);
    131 	}
    132 	/* NOTREACHED */
    133 }
    134