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

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1996-10-13 06:59:55 +04:00
/* $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;
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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