759 lines
19 KiB
C
759 lines
19 KiB
C
/* $NetBSD: kern_subr.c,v 1.228 2020/01/01 22:57:17 thorpej Exp $ */
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/*-
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* Copyright (c) 1997, 1998, 1999, 2002, 2007, 2008 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
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* NASA Ames Research Center, and by Luke Mewburn.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Copyright (c) 1982, 1986, 1991, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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*
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This software was developed by the Computer Systems Engineering group
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* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
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* contributed to Berkeley.
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*
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* All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Lawrence Berkeley Laboratory.
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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. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)kern_subr.c 8.4 (Berkeley) 2/14/95
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: kern_subr.c,v 1.228 2020/01/01 22:57:17 thorpej Exp $");
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#include "opt_ddb.h"
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#include "opt_md.h"
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#include "opt_tftproot.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/mount.h>
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#include <sys/device.h>
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#include <sys/reboot.h>
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#include <sys/conf.h>
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#include <sys/disk.h>
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#include <sys/disklabel.h>
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#include <sys/queue.h>
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#include <sys/fcntl.h>
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#include <sys/kauth.h>
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#include <sys/stat.h>
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#include <sys/vnode.h>
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#include <sys/module.h>
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#include <dev/cons.h>
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#include <net/if.h>
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/* XXX these should eventually move to subr_autoconf.c */
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static device_t finddevice(const char *);
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static device_t getdisk(const char *, int, int, dev_t *, int);
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static device_t parsedisk(const char *, int, int, dev_t *);
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static const char *getwedgename(const char *, int);
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static void setroot_nfs(device_t);
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static void setroot_md(device_t *);
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static void setroot_ask(device_t, int);
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static void setroot_root(device_t, int);
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static void setroot_dump(device_t, device_t);
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#ifdef TFTPROOT
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int tftproot_dhcpboot(device_t);
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#endif
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dev_t dumpcdev; /* for savecore */
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static int
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isswap(device_t dv)
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{
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struct dkwedge_info wi;
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struct vnode *vn;
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int error;
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if (device_class(dv) != DV_DISK || !device_is_a(dv, "dk"))
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return 0;
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if ((vn = opendisk(dv)) == NULL)
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return 0;
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error = VOP_IOCTL(vn, DIOCGWEDGEINFO, &wi, FREAD, NOCRED);
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VOP_CLOSE(vn, FREAD, NOCRED);
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vput(vn);
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if (error) {
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#ifdef DEBUG_WEDGE
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printf("%s: Get wedge info returned %d\n", device_xname(dv), error);
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#endif
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return 0;
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}
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return strcmp(wi.dkw_ptype, DKW_PTYPE_SWAP) == 0;
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}
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/*
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* Determine the root device and, if instructed to, the root file system.
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*/
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#ifdef MEMORY_DISK_IS_ROOT
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int md_is_root = 1;
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#else
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int md_is_root = 0;
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#endif
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/*
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* The device and partition that we booted from.
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*
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* This data might be initialized by MD code, but is defined here.
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*/
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device_t booted_device;
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const char *booted_method;
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int booted_partition;
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daddr_t booted_startblk;
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uint64_t booted_nblks;
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char *bootspec;
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/*
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* Use partition letters if it's a disk class but not a wedge or flash.
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* XXX Check for wedge/flash is kinda gross.
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*/
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#define DEV_USES_PARTITIONS(dv) \
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(device_class((dv)) == DV_DISK && \
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!device_is_a((dv), "dk") && \
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!device_is_a((dv), "flash"))
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void
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setroot(device_t bootdv, int bootpartition)
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{
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/*
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* Let bootcode augment "rootspec", ensure that
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* rootdev is invalid to avoid confusion.
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*/
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if (rootspec == NULL) {
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rootspec = bootspec;
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rootdev = NODEV;
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}
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/*
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* force boot device to md0
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*/
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if (md_is_root)
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setroot_md(&bootdv);
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#ifdef TFTPROOT
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/*
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* XXX
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* if rootspec specifies an interface
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* sets root_device to that interface
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* reuses NFS init code to set up network
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* fetch image into ram disk
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*
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* if successful, we change boot device
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*/
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if (tftproot_dhcpboot(bootdv) == 0)
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setroot_md(&bootdv);
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#endif
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/*
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* quirk for
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* evbarm/mini2440
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* hpcarm
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* hpcmips
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* hpcsh
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*
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* if rootfstype is set to NFS and the
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* kernel supports NFS and the boot device
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* is unknown or not a network interface
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* -> chose the first network interface you find
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*
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* hp300 has similar MD code
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*/
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setroot_nfs(bootdv);
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/*
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* If no bootdv was found by MD code and no
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* root specified ask the user.
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*/
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if (rootspec == NULL && bootdv == NULL)
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boothowto |= RB_ASKNAME;
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/*
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* loop until a root device is specified
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*/
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do {
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if (boothowto & RB_ASKNAME)
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setroot_ask(bootdv, bootpartition);
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else
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setroot_root(bootdv, bootpartition);
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if (root_device == NULL)
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boothowto |= RB_ASKNAME;
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} while (root_device == NULL);
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}
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/*
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* If NFS is specified as the file system, and we found
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* a DV_DISK boot device (or no boot device at all), then
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* find a reasonable network interface for "rootspec".
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*/
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static void
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setroot_nfs(device_t dv)
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{
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struct vfsops *vops;
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struct ifnet *ifp;
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vops = vfs_getopsbyname(MOUNT_NFS);
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if (vops != NULL && strcmp(rootfstype, MOUNT_NFS) == 0 &&
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rootspec == NULL &&
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(dv == NULL || device_class(dv) != DV_IFNET)) {
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int s = pserialize_read_enter();
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IFNET_READER_FOREACH(ifp) {
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if ((ifp->if_flags &
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(IFF_LOOPBACK|IFF_POINTOPOINT)) == 0)
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break;
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}
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if (ifp != NULL) {
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/*
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* Have a suitable interface; behave as if
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* the user specified this interface.
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*/
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rootspec = (const char *)ifp->if_xname;
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}
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pserialize_read_exit(s);
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}
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if (vops != NULL)
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vfs_delref(vops);
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}
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/*
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* Change boot device to md0
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*
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* md0 only exists when it is opened once.
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*/
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static void
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setroot_md(device_t *dvp)
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{
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int md_major;
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dev_t md_dev;
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md_major = devsw_name2blk("md", NULL, 0);
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if (md_major >= 0) {
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md_dev = MAKEDISKDEV(md_major, 0, RAW_PART);
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if (bdev_open(md_dev, FREAD, S_IFBLK, curlwp) == 0)
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*dvp = device_find_by_xname("md0");
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}
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}
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static void
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setroot_ask(device_t bootdv, int bootpartition)
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{
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device_t dv, defdumpdv, rootdv, dumpdv;
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dev_t nrootdev, ndumpdev;
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struct vfsops *vops;
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const char *deffsname;
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int len;
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char buf[128];
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for (;;) {
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printf("root device");
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if (bootdv != NULL) {
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printf(" (default %s", device_xname(bootdv));
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if (DEV_USES_PARTITIONS(bootdv))
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printf("%c", bootpartition + 'a');
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printf(")");
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}
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printf(": ");
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len = cngetsn(buf, sizeof(buf));
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if (len == 0 && bootdv != NULL) {
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strlcpy(buf, device_xname(bootdv), sizeof(buf));
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len = strlen(buf);
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}
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if (len > 0 && buf[len - 1] == '*') {
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buf[--len] = '\0';
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dv = getdisk(buf, len, 1, &nrootdev, 0);
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if (dv != NULL) {
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rootdv = dv;
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break;
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}
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}
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dv = getdisk(buf, len, bootpartition, &nrootdev, 0);
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if (dv != NULL) {
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rootdv = dv;
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break;
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}
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}
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rootdev = nrootdev;
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/*
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* Set up the default dump device. If root is on
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* a network device or a disk without partitions,
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* there is no default dump device.
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*/
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if (DEV_USES_PARTITIONS(rootdv) == 0)
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defdumpdv = NULL;
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else
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defdumpdv = rootdv;
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ndumpdev = NODEV;
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for (;;) {
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printf("dump device");
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if (defdumpdv != NULL) {
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/*
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* Note, we know it's a disk if we get here.
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*/
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printf(" (default %sb)", device_xname(defdumpdv));
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}
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printf(": ");
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len = cngetsn(buf, sizeof(buf));
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if (len == 0) {
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if (defdumpdv != NULL) {
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ndumpdev = MAKEDISKDEV(major(nrootdev),
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DISKUNIT(nrootdev), 1);
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}
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dumpdv = defdumpdv;
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break;
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}
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if (len == 4 && strcmp(buf, "none") == 0) {
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dumpdv = NULL;
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break;
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}
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dv = getdisk(buf, len, 1, &ndumpdev, 1);
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if (dv != NULL) {
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dumpdv = dv;
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break;
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}
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}
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dumpdev = ndumpdev;
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for (vops = LIST_FIRST(&vfs_list); vops != NULL;
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vops = LIST_NEXT(vops, vfs_list)) {
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if (vops->vfs_mountroot != NULL &&
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strcmp(rootfstype, vops->vfs_name) == 0)
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break;
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}
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if (vops == NULL) {
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deffsname = "generic";
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} else
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deffsname = vops->vfs_name;
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for (;;) {
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printf("file system (default %s): ", deffsname);
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len = cngetsn(buf, sizeof(buf));
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if (len == 0) {
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if (strcmp(deffsname, "generic") == 0)
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rootfstype = ROOT_FSTYPE_ANY;
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break;
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}
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if (len == 4 && strcmp(buf, "halt") == 0)
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kern_reboot(RB_HALT, NULL);
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else if (len == 6 && strcmp(buf, "reboot") == 0)
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kern_reboot(0, NULL);
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#if defined(DDB)
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else if (len == 3 && strcmp(buf, "ddb") == 0) {
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console_debugger();
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}
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#endif
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else if (len == 7 && strcmp(buf, "generic") == 0) {
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rootfstype = ROOT_FSTYPE_ANY;
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break;
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}
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vops = vfs_getopsbyname(buf);
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if (vops == NULL || vops->vfs_mountroot == NULL) {
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printf("use one of: generic");
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for (vops = LIST_FIRST(&vfs_list);
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vops != NULL;
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vops = LIST_NEXT(vops, vfs_list)) {
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if (vops->vfs_mountroot != NULL)
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printf(" %s", vops->vfs_name);
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}
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if (vops != NULL)
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vfs_delref(vops);
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#if defined(DDB)
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printf(" ddb");
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#endif
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printf(" halt reboot\n");
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} else {
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/*
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* XXX If *vops gets freed between here and
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* the call to mountroot(), rootfstype will
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* point to something unexpected. But in
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* this case the system will fail anyway.
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*/
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rootfstype = vops->vfs_name;
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vfs_delref(vops);
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break;
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}
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}
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root_device = rootdv;
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setroot_dump(root_device, dumpdv);
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}
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/*
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* configure
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* device_t root_device
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* dev_t rootdev (for disks)
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*
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*/
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static void
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setroot_root(device_t bootdv, int bootpartition)
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{
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device_t rootdv;
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int majdev;
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const char *rootdevname;
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char buf[128];
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dev_t nrootdev;
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if (rootspec == NULL) {
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/*
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* Wildcarded root; use the boot device.
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*/
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rootdv = bootdv;
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if (bootdv)
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majdev = devsw_name2blk(device_xname(bootdv), NULL, 0);
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else
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majdev = -1;
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if (majdev >= 0) {
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/*
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* Root is on a disk. `bootpartition' is root,
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* unless the device does not use partitions.
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*/
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if (DEV_USES_PARTITIONS(bootdv))
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rootdev = MAKEDISKDEV(majdev,
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device_unit(bootdv),
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bootpartition);
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else
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rootdev = makedev(majdev, device_unit(bootdv));
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}
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} else {
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/*
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* `root on <dev> ...'
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*/
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/*
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* If rootspec can be parsed, just use it.
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*/
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rootdv = parsedisk(rootspec, strlen(rootspec), 0, &nrootdev);
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if (rootdv != NULL) {
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rootdev = nrootdev;
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goto haveroot;
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}
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/*
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* Fall back to rootdev, compute rootdv for it
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*/
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rootdevname = devsw_blk2name(major(rootdev));
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if (rootdevname == NULL) {
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printf("unknown device major 0x%llx\n",
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(unsigned long long)rootdev);
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return;
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}
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memset(buf, 0, sizeof(buf));
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snprintf(buf, sizeof(buf), "%s%llu", rootdevname,
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(unsigned long long)DISKUNIT(rootdev));
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rootdv = finddevice(buf);
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if (rootdv == NULL) {
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printf("device %s (0x%llx) not configured\n",
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buf, (unsigned long long)rootdev);
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return;
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}
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}
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haveroot:
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switch (device_class(rootdv)) {
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case DV_IFNET:
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case DV_DISK:
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aprint_normal("root on %s", device_xname(rootdv));
|
|
if (DEV_USES_PARTITIONS(rootdv))
|
|
aprint_normal("%c", (int)DISKPART(rootdev) + 'a');
|
|
break;
|
|
default:
|
|
printf("can't determine root device\n");
|
|
return;
|
|
}
|
|
|
|
root_device = rootdv;
|
|
setroot_dump(rootdv, NULL);
|
|
}
|
|
|
|
/*
|
|
* configure
|
|
* dev_t dumpdev
|
|
* dev_t dumpcdev
|
|
*
|
|
* set to NODEV if device not found
|
|
*/
|
|
static void
|
|
setroot_dump(device_t rootdv, device_t dumpdv)
|
|
{
|
|
device_t dv;
|
|
deviter_t di;
|
|
const char *dumpdevname;
|
|
int majdev;
|
|
char buf[128];
|
|
|
|
/*
|
|
* Now configure the dump device.
|
|
*
|
|
* If we haven't figured out the dump device, do so, with
|
|
* the following rules:
|
|
*
|
|
* (a) We already know dumpdv in the RB_ASKNAME case.
|
|
*
|
|
* (b) If dumpspec is set, try to use it. If the device
|
|
* is not available, punt.
|
|
*
|
|
* (c) If dumpspec is not set, the dump device is
|
|
* wildcarded or unspecified. If the root device
|
|
* is DV_IFNET, punt. Otherwise, use partition b
|
|
* of the root device.
|
|
*/
|
|
|
|
if (boothowto & RB_ASKNAME) { /* (a) */
|
|
if (dumpdv == NULL)
|
|
goto nodumpdev;
|
|
} else if (dumpspec != NULL) { /* (b) */
|
|
if (strcmp(dumpspec, "none") == 0 || dumpdev == NODEV) {
|
|
/*
|
|
* Operator doesn't want a dump device.
|
|
* Or looks like they tried to pick a network
|
|
* device. Oops.
|
|
*/
|
|
goto nodumpdev;
|
|
}
|
|
|
|
dumpdevname = devsw_blk2name(major(dumpdev));
|
|
if (dumpdevname == NULL)
|
|
goto nodumpdev;
|
|
memset(buf, 0, sizeof(buf));
|
|
snprintf(buf, sizeof(buf), "%s%llu", dumpdevname,
|
|
(unsigned long long)DISKUNIT(dumpdev));
|
|
|
|
dumpdv = finddevice(buf);
|
|
if (dumpdv == NULL) {
|
|
/*
|
|
* Device not configured.
|
|
*/
|
|
goto nodumpdev;
|
|
}
|
|
} else { /* (c) */
|
|
if (DEV_USES_PARTITIONS(rootdv) == 0) {
|
|
for (dv = deviter_first(&di, DEVITER_F_ROOT_FIRST);
|
|
dv != NULL;
|
|
dv = deviter_next(&di))
|
|
if (isswap(dv))
|
|
break;
|
|
deviter_release(&di);
|
|
if (dv == NULL)
|
|
goto nodumpdev;
|
|
|
|
majdev = devsw_name2blk(device_xname(dv), NULL, 0);
|
|
if (majdev < 0)
|
|
goto nodumpdev;
|
|
dumpdv = dv;
|
|
dumpdev = makedev(majdev, device_unit(dumpdv));
|
|
} else {
|
|
dumpdv = rootdv;
|
|
dumpdev = MAKEDISKDEV(major(rootdev),
|
|
device_unit(dumpdv), 1);
|
|
}
|
|
}
|
|
|
|
dumpcdev = devsw_blk2chr(dumpdev);
|
|
aprint_normal(" dumps on %s", device_xname(dumpdv));
|
|
if (DEV_USES_PARTITIONS(dumpdv))
|
|
aprint_normal("%c", (int)DISKPART(dumpdev) + 'a');
|
|
aprint_normal("\n");
|
|
return;
|
|
|
|
nodumpdev:
|
|
dumpdev = NODEV;
|
|
dumpcdev = NODEV;
|
|
aprint_normal("\n");
|
|
}
|
|
|
|
static device_t
|
|
finddevice(const char *name)
|
|
{
|
|
const char *wname;
|
|
|
|
if ((wname = getwedgename(name, strlen(name))) != NULL)
|
|
return dkwedge_find_by_wname(wname);
|
|
|
|
return device_find_by_xname(name);
|
|
}
|
|
|
|
static device_t
|
|
getdisk(const char *str, int len, int defpart, dev_t *devp, int isdump)
|
|
{
|
|
device_t dv;
|
|
deviter_t di;
|
|
|
|
if (len == 4 && strcmp(str, "halt") == 0)
|
|
kern_reboot(RB_HALT, NULL);
|
|
else if (len == 6 && strcmp(str, "reboot") == 0)
|
|
kern_reboot(0, NULL);
|
|
#if defined(DDB)
|
|
else if (len == 3 && strcmp(str, "ddb") == 0) {
|
|
console_debugger();
|
|
return NULL;
|
|
}
|
|
#endif
|
|
|
|
if ((dv = parsedisk(str, len, defpart, devp)) == NULL) {
|
|
printf("use one of:");
|
|
for (dv = deviter_first(&di, DEVITER_F_ROOT_FIRST); dv != NULL;
|
|
dv = deviter_next(&di)) {
|
|
if (DEV_USES_PARTITIONS(dv))
|
|
printf(" %s[a-%c]", device_xname(dv),
|
|
'a' + MAXPARTITIONS - 1);
|
|
else if (device_class(dv) == DV_DISK)
|
|
printf(" %s", device_xname(dv));
|
|
if (isdump == 0 && device_class(dv) == DV_IFNET)
|
|
printf(" %s", device_xname(dv));
|
|
}
|
|
deviter_release(&di);
|
|
dkwedge_print_wnames();
|
|
if (isdump)
|
|
printf(" none");
|
|
#if defined(DDB)
|
|
printf(" ddb");
|
|
#endif
|
|
printf(" halt reboot\n");
|
|
}
|
|
return dv;
|
|
}
|
|
|
|
static const char *
|
|
getwedgename(const char *name, int namelen)
|
|
{
|
|
const char *wpfx1 = "wedge:";
|
|
const char *wpfx2 = "NAME=";
|
|
const int wpfx1len = strlen(wpfx1);
|
|
const int wpfx2len = strlen(wpfx2);
|
|
|
|
if (namelen > wpfx1len && strncmp(name, wpfx1, wpfx1len) == 0)
|
|
return name + wpfx1len;
|
|
|
|
if (namelen > wpfx2len && strncasecmp(name, wpfx2, wpfx2len) == 0)
|
|
return name + wpfx2len;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static device_t
|
|
parsedisk(const char *str, int len, int defpart, dev_t *devp)
|
|
{
|
|
device_t dv;
|
|
const char *wname;
|
|
char c;
|
|
int majdev, part;
|
|
char xname[16]; /* same size as dv_xname */
|
|
|
|
if (len == 0)
|
|
return (NULL);
|
|
|
|
if ((wname = getwedgename(str, len)) != NULL) {
|
|
if ((dv = dkwedge_find_by_wname(wname)) == NULL)
|
|
return NULL;
|
|
part = defpart;
|
|
goto gotdisk;
|
|
}
|
|
|
|
c = str[len-1];
|
|
if (c >= 'a' && c <= ('a' + MAXPARTITIONS - 1)) {
|
|
part = c - 'a';
|
|
len--;
|
|
if (len > sizeof(xname)-1)
|
|
return NULL;
|
|
memcpy(xname, str, len);
|
|
xname[len] = '\0';
|
|
str = xname;
|
|
} else
|
|
part = defpart;
|
|
|
|
dv = finddevice(str);
|
|
if (dv != NULL) {
|
|
if (device_class(dv) == DV_DISK) {
|
|
gotdisk:
|
|
majdev = devsw_name2blk(device_xname(dv), NULL, 0);
|
|
if (majdev < 0)
|
|
panic("parsedisk");
|
|
if (DEV_USES_PARTITIONS(dv))
|
|
*devp = MAKEDISKDEV(majdev, device_unit(dv),
|
|
part);
|
|
else
|
|
*devp = makedev(majdev, device_unit(dv));
|
|
}
|
|
|
|
if (device_class(dv) == DV_IFNET)
|
|
*devp = NODEV;
|
|
}
|
|
|
|
return (dv);
|
|
}
|