Home | History | Annotate | Line # | Download | only in dosboot 
      1 /*	$NetBSD: devopen.c,v 1.12 2024/06/29 13:46:40 rin 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 <bootinfo.h>
     36 
     37 #include "dosfile.h"
     38 
     39 struct devsw devsw[] = {
     40 	{"disk", biosdisk_strategy, biosdisk_open, biosdisk_close, biosdisk_ioctl},
     41 };
     42 int ndevs = sizeof(devsw) / sizeof(struct devsw);
     43 
     44 static struct fs_ops dosfs = {
     45 	dos_open, dos_close, dos_read, dos_write, dos_seek, dos_stat
     46 };
     47 static struct fs_ops ufsfs = {
     48 	ufs_open, ufs_close, ufs_read, ufs_write, ufs_seek, ufs_stat
     49 };
     50 
     51 struct fs_ops   file_system[] = {
     52 	{0},
     53 };
     54 int  nfsys = 1;
     55 
     56 static struct {
     57 	char           *name;
     58 	int             biosdev;
     59 }               biosdevtab[] = {
     60 	{
     61 		"fd", 0
     62 	},
     63 	{
     64 		"wd", 0x80
     65 	},
     66 	{
     67 		"sd", 0x80
     68 	},
     69 	{
     70 		"hd", 0x80
     71 	}
     72 };
     73 #define NUMBIOSDEVS (sizeof(biosdevtab) / sizeof(biosdevtab[0]))
     74 
     75 static int dev2bios(char *, unsigned int, int *);
     76 
     77 static int
     78 dev2bios(char *devname, unsigned int unit, int *biosdev)
     79 {
     80 	unsigned             i;
     81 
     82 	for (i = 0; i < NUMBIOSDEVS; i++)
     83 		if (!strcmp(devname, biosdevtab[i].name)) {
     84 			*biosdev = biosdevtab[i].biosdev + unit;
     85 			if (unit >= 4)	/* ??? */
     86 				return (EUNIT);
     87 			return (0);
     88 		}
     89 	return (ENXIO);
     90 }
     91 
     92 struct btinfo_bootpath bibp;
     93 
     94 int
     95 devopen(struct open_file *f, const char *fname, char **file)
     96 {
     97 	char           *devname;
     98 	char           *fsmode;
     99 	int             unit, partition;
    100 	int             biosdev;
    101 	int             error;
    102 	struct devsw   *dp;
    103 
    104 	if ((error = parsebootfile(fname, &fsmode, &devname, &unit,
    105 	    &partition, (const char **) file)))
    106 		return (error);
    107 
    108 	if (!strcmp(fsmode, "dos")) {
    109 		file_system[0] = dosfs;	/* structure assignment! */
    110 		f->f_flags |= F_NODEV;	/* handled by DOS */
    111 		return (0);
    112 	} else if (!strcmp(fsmode, "ufs")) {
    113 		if ((error = dev2bios(devname, unit, &biosdev)))
    114 			return (error);
    115 		file_system[0] = ufsfs;	/* structure assignment! */
    116 		dp = &devsw[0];	/* must be biosdisk */
    117 		f->f_dev = dp;
    118 
    119 		strncpy(bibp.bootpath, *file, sizeof(bibp.bootpath));
    120 		BI_ADD(&bibp, BTINFO_BOOTPATH, sizeof(bibp));
    121 
    122 		return (biosdisk_open(f, biosdev, partition));
    123 	} else {
    124 		printf("no file system\n");
    125 		return (ENXIO);
    126 	}
    127 	/* NOTREACHED */
    128 }
    129