NetBSD/sys/arch/i386/stand/dosboot/devopen.c

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/* $NetBSD: devopen.c,v 1.3 1997/09/17 18:40:33 drochner Exp $ */
/*
* Copyright (c) 1996
* Matthias Drochner. 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed for the NetBSD Project
* by Matthias Drochner.
* 4. 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 <lib/libsa/ufs.h>
#include <libi386.h>
#include <biosdisk.h>
#include <dosfile.h>
#include <bootinfo.h>
extern int parsebootfile __P((const char *, char**, char**, unsigned int*,
unsigned int*, const char**));
struct devsw devsw[] = {
{"disk", biosdiskstrategy, biosdiskopen, biosdiskclose, biosdiskioctl},
};
int ndevs = sizeof(devsw) / sizeof(struct devsw);
static struct fs_ops dosfs = {
dos_open, dos_close, dos_read, dos_write, dos_seek, dos_stat
};
static struct fs_ops ufsfs = {
ufs_open, ufs_close, ufs_read, ufs_write, ufs_seek, ufs_stat
};
struct fs_ops file_system[] = {
{0},
};
int nfsys = 1;
static struct {
char *name;
int biosdev;
} biosdevtab[] = {
{
"fd", 0
},
{
"wd", 0x80
},
{
"sd", 0x80
},
{
"hd", 0x80
}
};
#define NUMBIOSDEVS (sizeof(biosdevtab) / sizeof(biosdevtab[0]))
static int
dev2bios(devname, unit, biosdev)
char *devname;
unsigned int unit;
int *biosdev;
{
int i;
for (i = 0; i < NUMBIOSDEVS; i++)
if (!strcmp(devname, biosdevtab[i].name)) {
*biosdev = biosdevtab[i].biosdev + unit;
if (unit >= 4) /* ??? */
return (EUNIT);
return (0);
}
return (ENXIO);
}
struct btinfo_bootpath bibp;
int
devopen(f, fname, file)
struct open_file *f;
const char *fname;
char **file;
{
char *devname;
char *fsmode;
unsigned int unit, partition;
int biosdev;
int error;
struct devsw *dp;
if ((error = parsebootfile(fname, &fsmode, &devname, &unit,
&partition, (const char **) file)))
return (error);
if (!strcmp(fsmode, "dos")) {
file_system[0] = dosfs; /* structure assignment! */
f->f_flags |= F_NODEV; /* handled by DOS */
return (0);
} else if (!strcmp(fsmode, "ufs")) {
if ((error = dev2bios(devname, unit, &biosdev)))
return (error);
file_system[0] = ufsfs; /* structure assignment! */
dp = &devsw[0]; /* must be biosdisk */
f->f_dev = dp;
strncpy(bibp.bootpath, *file, sizeof(bibp.bootpath));
BI_ADD(&bibp, BTINFO_BOOTPATH, sizeof(bibp));
return (biosdiskopen(f, biosdev, partition));
} else {
printf("no file system\n");
return (ENXIO);
}
/* NOTREACHED */
}