123 lines
3.3 KiB
C
123 lines
3.3 KiB
C
/* $NetBSD: md_root.c,v 1.1 1996/06/20 20:15:40 pk Exp $ */
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/*
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* Copyright (c) 1995 Gordon W. Ross
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/param.h>
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#include <sys/reboot.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/buf.h>
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#include <sys/conf.h>
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#include <sys/stat.h>
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#include <dev/ramdisk.h>
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extern int boothowto;
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int (*rd_read_image) __P((size_t *, caddr_t *));
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/*
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* This is called during autoconfig.
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*/
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void
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rd_attach_hook(unit, rd)
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int unit;
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struct rd_conf *rd;
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{
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if (unit == 0 && rd_read_image != NULL) {
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/* Setup root ramdisk */
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if ((*rd_read_image)(&rd->rd_size, &rd->rd_addr) != 0)
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panic("rd_attach");
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rd->rd_type = RD_KMEM_FIXED;
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printf("rd0: fixed, %d blocks", rd->rd_size >> DEV_BSHIFT);
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}
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}
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/*
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* This is called during open (i.e. mountroot)
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*/
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void
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rd_open_hook(unit, rd)
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int unit;
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struct rd_conf *rd;
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{
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if (unit == 0) {
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/* The root ramdisk only works single-user. */
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boothowto |= RB_SINGLE;
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}
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}
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#if 0
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int
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rd_read_image (dev, addr)
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dev_t dev;
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caddr_t addr;
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{
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off_t offset;
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int error;
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extern struct proc proc0;
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struct buf fishtank;
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struct buf *bp = &fishtank;
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error = (*bdevsw[major(dev)].d_open)(dev, 0, S_IFCHR, &proc0);
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if (error)
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panic("rd_read_image: open: error %d", error);
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bzero(bp, sizeof(*bp));
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offset = 0;
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for (;;) {
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iovec.iov_base = addr;
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iovec.iov_len = DEV_BSIZE;
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uio.uio_iov = &iovec;
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uio.uio_iovcnt = 1;
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uio.uio_offset = offset;
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uio.uio_resid = DEV_BSIZE;
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uio.uio_segflg = UIO_SYSSPACE;
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uio.uio_rw = UIO_READ;
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uio.uio_procp = &proc0;
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error = (*cdevsw[major(dev)].d_read)(dev, &uio, 0);
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if (error)
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panic("rd_read_image: read: error %d", error);
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if (uio.uio_resid != 0)
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break;
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addr += DEV_BSIZE;
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offset += DEV_BSIZE;
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rd_root_size += DEV_BSIZE;
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if (offset + DEV_BSIZE > rd_root_size)
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break;
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}
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(void)(*bdevsw[major(dev)].d_close)(dev, 0, S_IFCHR, &proc0);
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rd_root_size = offset;
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return 0;
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}
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#endif
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