conf.c

早期freebsd实现

/*
 * Copyright (c) 1992 OMRON Corporation.
 * Copyright (c) 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * OMRON Corporation.
 *
 * 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 by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
 *
 *	@(#)conf.c	8.1 (Berkeley) 6/10/93
 */

#include <luna68k/stand/saio.h>

devread(io)
	register struct iob *io;
{
	int cc;

	io->i_flgs |= F_RDDATA;
	io->i_error = 0;
	cc = (*devsw[io->i_dev].dv_strategy)(io, READ);
	io->i_flgs &= ~F_TYPEMASK;
	return (cc);
}

devwrite(io)
	register struct iob *io;
{
	int cc;

	io->i_flgs |= F_WRDATA;
	io->i_error = 0;
	cc = (*devsw[io->i_dev].dv_strategy)(io, WRITE);
	io->i_flgs &= ~F_TYPEMASK;
	return (cc);
}

devopen(io)
	register struct iob *io;
{

	(*devsw[io->i_dev].dv_open)(io);
}

devclose(io)
	register struct iob *io;
{

	(*devsw[io->i_dev].dv_close)(io);
}

devioctl(io, cmd, arg)
	register struct iob *io;
	int cmd;
	caddr_t arg;
{

	return ((*devsw[io->i_dev].dv_ioctl)(io, cmd, arg));
}

/*ARGSUSED*/
nullsys(io)
	struct iob *io;
{

	;
}

/*ARGSUSED*/
nullioctl(io, cmd, arg)
	struct iob *io;
	int cmd;
	caddr_t arg;
{

	return (ECMD);
}

int	nullsys(), nullioctl();
int	sdstrategy(), sdopen(), sdioctl();

struct devsw devsw[] = {
	{ "sd",	sdstrategy,	sdopen,		nullsys,	nullioctl },
	{ 0, 0, 0, 0, 0 },
};

dev_t
make_device(str)
	char *str;
{
	char *cp;
	struct devsw *dp;
	int major, unit, part;

	/*
	 * parse path strings
	 */
							/* find end of dev type name */
	for (cp = str; *cp && *cp != '('; cp++)
			;
	if (*cp != '(') {
		return (-1);
	}
							/* compare dev type name */
	*cp = '\0';
	for (dp = devsw; dp->dv_name; dp++)
		if (!strcmp(str, dp->dv_name))
			break;
	*cp++ = '(';
	if (dp->dv_name == NULL) {
		return (-1);
	}
	major = dp - devsw;
							/* get unit number */
	unit = *cp++ - '0';
	if (*cp >= '0' && *cp <= '9')
		unit = unit * 10 + *cp++ - '0';
	if (unit < 0 || unit > 63) {
		return (-1);
	}
							/* get partition offset */
	if (*cp++ != ',') {
		return (-1);
	}
	part = *cp - '0';
							/* check out end of dev spec */
	for (;;) {
		if (*cp == ')')
			break;
		if (*cp++)
			continue;
		return (-1);
	}

	return(major << 8 | unit << 3 | part);
}