NetBSD/sys/arch/sparc/dev/md_root.c

/*	$NetBSD: md_root.c,v 1.3 1996/10/13 03:00:02 christos Exp $	*/

/*
 * Copyright (c) 1995 Gordon W. Ross
 * 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. 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 <sys/param.h>
#include <sys/reboot.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/buf.h>
#include <sys/conf.h>
#include <sys/stat.h>

#include <dev/ramdisk.h>

extern int boothowto;

int	(*rd_read_image) __P((size_t *, caddr_t *));

/*
 * This is called during autoconfig.
 */
void
rd_attach_hook(unit, rd)
	int unit;
	struct rd_conf *rd;
{
	if (unit == 0 && rd_read_image != NULL) {
		/* Setup root ramdisk */
		if ((*rd_read_image)(&rd->rd_size, &rd->rd_addr) != 0)
			panic("rd_attach");
		rd->rd_type = RD_KMEM_FIXED;
		printf("rd0: fixed, %d blocks", rd->rd_size >> DEV_BSHIFT);
	}
}

/*
 * This is called during open (i.e. mountroot)
 */
void
rd_open_hook(unit, rd)
	int unit;
	struct rd_conf *rd;
{
	if (unit == 0) {
		/* The root ramdisk only works single-user. */
		boothowto |= RB_SINGLE;
	}
}

#if 0
int
rd_read_image (dev, addr)
	dev_t dev;
	caddr_t addr;
{
	off_t offset;
	int error;
	extern struct proc proc0;
	struct buf fishtank;
	struct buf *bp = &fishtank;

	error = (*bdevsw[major(dev)].d_open)(dev, 0, S_IFCHR, &proc0);
	if (error)
		panic("rd_read_image: open: error %d", error);

	bzero(bp, sizeof(*bp));
	offset = 0;

	for (;;) {
		iovec.iov_base = addr;
		iovec.iov_len = DEV_BSIZE;

		uio.uio_iov = &iovec;
		uio.uio_iovcnt = 1;
		uio.uio_offset = offset;
		uio.uio_resid = DEV_BSIZE;
		uio.uio_segflg = UIO_SYSSPACE;
		uio.uio_rw = UIO_READ;
		uio.uio_procp = &proc0;
		error = (*cdevsw[major(dev)].d_read)(dev, &uio, 0);
		if (error)
			panic("rd_read_image: read: error %d", error);

		if (uio.uio_resid != 0)
			break;

		addr += DEV_BSIZE;
		offset += DEV_BSIZE;
		rd_root_size += DEV_BSIZE;
		if (offset + DEV_BSIZE > rd_root_size)
			break;
	}
	(void)(*bdevsw[major(dev)].d_close)(dev, 0, S_IFCHR, &proc0);
	rd_root_size = offset;
	return 0;
}
#endif