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

132 lines
3.7 KiB
C

/* $NetBSD: md_root.c,v 1.6 1997/10/09 08:37:20 jtc Exp $ */
/*-
* Copyright (c) 1996 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Gordon W. Ross.
*
* 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 NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
#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/md.h>
extern int boothowto;
int (*md_read_image) __P((size_t *, caddr_t *));
/*
* This is called during autoconfig.
*/
void
md_attach_hook(unit, md)
int unit;
struct md_conf *md;
{
if (unit == 0 && md_read_image != NULL) {
/* Setup root ramdisk */
if ((*md_read_image)(&md->md_size, &md->md_addr) != 0)
panic("md_attach");
md->md_type = MD_KMEM_FIXED;
printf("md0: fixed, %d blocks", md->md_size >> DEV_BSHIFT);
}
}
/*
* This is called during open (i.e. mountroot)
*/
void
md_open_hook(unit, md)
int unit;
struct md_conf *md;
{
if (unit == 0) {
/* The root ramdisk only works single-user. */
boothowto |= RB_SINGLE;
}
}
#if 0
int
md_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("md_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("md_read_image: read: error %d", error);
if (uio.uio_resid != 0)
break;
addr += DEV_BSIZE;
offset += DEV_BSIZE;
md_root_size += DEV_BSIZE;
if (offset + DEV_BSIZE > md_root_size)
break;
}
(void)(*bdevsw[major(dev)].d_close)(dev, 0, S_IFCHR, &proc0);
md_root_size = offset;
return 0;
}
#endif