718 lines
18 KiB
C
718 lines
18 KiB
C
/* $NetBSD: init_main.c,v 1.204 2002/08/25 19:15:55 thorpej Exp $ */
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/*
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* Copyright (c) 1995 Christopher G. Demetriou. All rights reserved.
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* Copyright (c) 1982, 1986, 1989, 1991, 1992, 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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* 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. 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, Berkeley and its contributors.
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* 4. 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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* @(#)init_main.c 8.16 (Berkeley) 5/14/95
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: init_main.c,v 1.204 2002/08/25 19:15:55 thorpej Exp $");
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#include "fs_nfs.h"
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#include "opt_nfsserver.h"
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#include "opt_sysv.h"
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#include "opt_maxuprc.h"
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#include "opt_multiprocessor.h"
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#include "opt_pipe.h"
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#include "opt_syscall_debug.h"
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#include "opt_systrace.h"
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#include "rnd.h"
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#include <sys/param.h>
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#include <sys/acct.h>
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#include <sys/filedesc.h>
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#include <sys/file.h>
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#include <sys/errno.h>
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#include <sys/callout.h>
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#include <sys/kernel.h>
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#include <sys/mount.h>
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#include <sys/map.h>
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#include <sys/proc.h>
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#include <sys/kthread.h>
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#include <sys/resourcevar.h>
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#include <sys/signalvar.h>
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#include <sys/systm.h>
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#include <sys/vnode.h>
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#include <sys/tty.h>
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#include <sys/conf.h>
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#include <sys/disklabel.h>
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#include <sys/buf.h>
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#include <sys/device.h>
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#include <sys/disk.h>
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#include <sys/exec.h>
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#include <sys/socketvar.h>
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#include <sys/protosw.h>
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#include <sys/reboot.h>
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#include <sys/user.h>
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#include <sys/sysctl.h>
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#ifdef SYSVSHM
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#include <sys/shm.h>
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#endif
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#ifdef SYSVSEM
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#include <sys/sem.h>
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#endif
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#ifdef SYSVMSG
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#include <sys/msg.h>
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#endif
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#ifdef SYSTRACE
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#include <sys/systrace.h>
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#endif
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#include <sys/domain.h>
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#include <sys/mbuf.h>
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#include <sys/namei.h>
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#if NRND > 0
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#include <sys/rnd.h>
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#endif
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#ifndef PIPE_SOCKETPAIR
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#include <sys/pipe.h>
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#endif
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#include <sys/syscall.h>
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#include <sys/syscallargs.h>
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#include <ufs/ufs/quota.h>
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#include <miscfs/genfs/genfs.h>
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#include <miscfs/syncfs/syncfs.h>
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#include <machine/cpu.h>
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#include <uvm/uvm.h>
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#include <dev/cons.h>
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#include <net/if.h>
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#include <net/raw_cb.h>
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const char copyright[] =
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"Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001, 2002\n"
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" The NetBSD Foundation, Inc. All rights reserved.\n"
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"Copyright (c) 1982, 1986, 1989, 1991, 1993\n"
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" The Regents of the University of California. All rights reserved.\n"
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"\n";
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/* Components of the first process -- never freed. */
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struct session session0;
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struct pgrp pgrp0;
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struct proc proc0;
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struct pcred cred0;
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struct filedesc0 filedesc0;
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struct cwdinfo cwdi0;
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struct plimit limit0;
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struct vmspace vmspace0;
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struct sigacts sigacts0;
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#ifndef curproc
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struct proc *curproc = &proc0;
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#endif
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struct proc *initproc;
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int cmask = CMASK;
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extern struct user *proc0paddr;
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struct vnode *rootvp, *swapdev_vp;
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int boothowto;
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int cold = 1; /* still working on startup */
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struct timeval boottime;
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__volatile int start_init_exec; /* semaphore for start_init() */
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static void check_console(struct proc *p);
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static void start_init(void *);
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void main(void);
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extern const struct emul emul_netbsd; /* defined in kern_exec.c */
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/*
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* System startup; initialize the world, create process 0, mount root
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* filesystem, and fork to create init and pagedaemon. Most of the
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* hard work is done in the lower-level initialization routines including
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* startup(), which does memory initialization and autoconfiguration.
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*/
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void
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main(void)
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{
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struct proc *p;
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struct pdevinit *pdev;
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int s, error;
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u_int i;
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rlim_t lim;
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extern struct pdevinit pdevinit[];
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extern void schedcpu(void *);
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#if defined(NFSSERVER) || defined(NFS)
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extern void nfs_init(void);
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#endif
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#ifdef NVNODE_IMPLICIT
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int usevnodes;
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#endif
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/*
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* Initialize the current process pointer (curproc) before
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* any possible traps/probes to simplify trap processing.
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*/
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p = &proc0;
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curproc = p;
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p->p_cpu = curcpu();
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/*
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* Attempt to find console and initialize
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* in case of early panic or other messages.
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*/
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consinit();
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printf("%s", copyright);
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KERNEL_LOCK_INIT();
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uvm_init();
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/* Do machine-dependent initialization. */
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cpu_startup();
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/* Initialize callouts. */
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callout_startup();
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/*
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* Initialize mbuf's. Do this now because we might attempt to
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* allocate mbufs or mbuf clusters during autoconfiguration.
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*/
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mbinit();
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/* Initialize sockets. */
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soinit();
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/*
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* The following 3 things must be done before autoconfiguration.
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*/
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disk_init(); /* initialize disk list */
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tty_init(); /* initialize tty list */
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#if NRND > 0
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rnd_init(); /* initialize RNG */
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#endif
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/* Initialize the sysctl subsystem. */
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sysctl_init();
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/*
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* Initialize process and pgrp structures.
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*/
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procinit();
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/*
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* Create process 0 (the swapper).
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*/
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s = proclist_lock_write();
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LIST_INSERT_HEAD(&allproc, p, p_list);
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LIST_INSERT_HEAD(PIDHASH(p->p_pid), p, p_hash);
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proclist_unlock_write(s);
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p->p_pgrp = &pgrp0;
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LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash);
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LIST_INIT(&pgrp0.pg_members);
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LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist);
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pgrp0.pg_session = &session0;
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session0.s_count = 1;
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session0.s_sid = p->p_pid;
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session0.s_leader = p;
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/*
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* Set P_NOCLDWAIT so that kernel threads are reparented to
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* init(8) when they exit. init(8) can easily wait them out
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* for us.
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*/
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p->p_flag = P_INMEM | P_SYSTEM | P_NOCLDWAIT;
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p->p_stat = SONPROC;
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p->p_nice = NZERO;
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p->p_emul = &emul_netbsd;
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#ifdef __HAVE_SYSCALL_INTERN
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(*p->p_emul->e_syscall_intern)(p);
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#endif
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strncpy(p->p_comm, "swapper", MAXCOMLEN);
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callout_init(&p->p_realit_ch);
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callout_init(&p->p_tsleep_ch);
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/* Create credentials. */
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cred0.p_refcnt = 1;
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p->p_cred = &cred0;
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p->p_ucred = crget();
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p->p_ucred->cr_ngroups = 1; /* group 0 */
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/* Create the file descriptor table. */
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finit();
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p->p_fd = &filedesc0.fd_fd;
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fdinit1(&filedesc0);
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/* Create the CWD info. */
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p->p_cwdi = &cwdi0;
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cwdi0.cwdi_cmask = cmask;
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cwdi0.cwdi_refcnt = 1;
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/* Create the limits structures. */
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p->p_limit = &limit0;
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for (i = 0; i < sizeof(p->p_rlimit)/sizeof(p->p_rlimit[0]); i++)
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limit0.pl_rlimit[i].rlim_cur =
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limit0.pl_rlimit[i].rlim_max = RLIM_INFINITY;
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limit0.pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles;
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limit0.pl_rlimit[RLIMIT_NOFILE].rlim_cur =
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maxfiles < NOFILE ? maxfiles : NOFILE;
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limit0.pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc;
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limit0.pl_rlimit[RLIMIT_NPROC].rlim_cur =
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maxproc < MAXUPRC ? maxproc : MAXUPRC;
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lim = ptoa(uvmexp.free);
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limit0.pl_rlimit[RLIMIT_RSS].rlim_max = lim;
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limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_max = lim;
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limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = lim / 3;
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limit0.pl_corename = defcorename;
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limit0.p_refcnt = 1;
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/*
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* Initialize proc0's vmspace, which uses the kernel pmap.
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* All kernel processes (which never have user space mappings)
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* share proc0's vmspace, and thus, the kernel pmap.
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*/
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uvmspace_init(&vmspace0, pmap_kernel(), round_page(VM_MIN_ADDRESS),
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trunc_page(VM_MAX_ADDRESS));
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p->p_vmspace = &vmspace0;
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p->p_addr = proc0paddr; /* XXX */
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/*
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* We continue to place resource usage info in the
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* user struct so they're pageable.
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*/
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p->p_stats = &p->p_addr->u_stats;
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/*
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* Charge root for one process.
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*/
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(void)chgproccnt(0, 1);
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rqinit();
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/* Configure virtual memory system, set vm rlimits. */
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uvm_init_limits(p);
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/* Initialize the file systems. */
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#if defined(NFSSERVER) || defined(NFS)
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nfs_init(); /* initialize server/shared data */
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#endif
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#ifdef NVNODE_IMPLICIT
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/*
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* If maximum number of vnodes in namei vnode cache is not explicitly
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* defined in kernel config, adjust the number such as we use roughly
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* 0.5% of memory for vnode cache (but not less than NVNODE vnodes).
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*/
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usevnodes = (ptoa((unsigned)physmem) / 200) / sizeof(struct vnode);
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if (usevnodes > desiredvnodes)
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desiredvnodes = usevnodes;
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#endif
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vfsinit();
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/* Configure the system hardware. This will enable interrupts. */
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configure();
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ubc_init(); /* must be after autoconfig */
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/* Lock the kernel on behalf of proc0. */
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KERNEL_PROC_LOCK(p);
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#ifdef SYSVSHM
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/* Initialize System V style shared memory. */
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shminit();
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#endif
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#ifdef SYSVSEM
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/* Initialize System V style semaphores. */
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seminit();
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#endif
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#ifdef SYSVMSG
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/* Initialize System V style message queues. */
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msginit();
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#endif
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/* Attach pseudo-devices. */
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for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++)
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(*pdev->pdev_attach)(pdev->pdev_count);
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/*
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* Initialize protocols. Block reception of incoming packets
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* until everything is ready.
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*/
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s = splnet();
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ifinit();
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domaininit();
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if_attachdomain();
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splx(s);
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#ifdef GPROF
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/* Initialize kernel profiling. */
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kmstartup();
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#endif
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/* Initialize system accouting. */
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acct_init();
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#ifdef SYSTRACE
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systrace_init();
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#endif
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/*
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* Initialize signal-related data structures, and signal state
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* for proc0.
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*/
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signal_init();
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p->p_sigacts = &sigacts0;
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siginit(p);
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/* Kick off timeout driven events by calling first time. */
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schedcpu(NULL);
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/*
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* Create process 1 (init(8)). We do this now, as Unix has
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* historically had init be process 1, and changing this would
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* probably upset a lot of people.
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*
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* Note that process 1 won't immediately exec init(8), but will
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* wait for us to inform it that the root file system has been
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* mounted.
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*/
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if (fork1(p, 0, SIGCHLD, NULL, 0, start_init, NULL, NULL, &initproc))
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panic("fork init");
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/*
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* Create any kernel threads who's creation was deferred because
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* initproc had not yet been created.
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*/
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kthread_run_deferred_queue();
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/*
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* Now that device driver threads have been created, wait for
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* them to finish any deferred autoconfiguration. Note we don't
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* need to lock this semaphore, since we haven't booted any
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* secondary processors, yet.
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*/
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while (config_pending)
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(void) tsleep((void *)&config_pending, PWAIT, "cfpend", 0);
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/*
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* Now that autoconfiguration has completed, we can determine
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* the root and dump devices.
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*/
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cpu_rootconf();
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cpu_dumpconf();
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/* Mount the root file system. */
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do {
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domountroothook();
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if ((error = vfs_mountroot())) {
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printf("cannot mount root, error = %d\n", error);
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boothowto |= RB_ASKNAME;
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setroot(root_device,
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(rootdev != NODEV) ? DISKPART(rootdev) : 0);
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}
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} while (error != 0);
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mountroothook_destroy();
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mountlist.cqh_first->mnt_flag |= MNT_ROOTFS;
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mountlist.cqh_first->mnt_op->vfs_refcount++;
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/*
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* Get the vnode for '/'. Set filedesc0.fd_fd.fd_cdir to
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* reference it.
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*/
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if (VFS_ROOT(mountlist.cqh_first, &rootvnode))
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panic("cannot find root vnode");
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cwdi0.cwdi_cdir = rootvnode;
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VREF(cwdi0.cwdi_cdir);
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VOP_UNLOCK(rootvnode, 0);
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cwdi0.cwdi_rdir = NULL;
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/*
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* Now that root is mounted, we can fixup initproc's CWD
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* info. All other processes are kthreads, which merely
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* share proc0's CWD info.
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*/
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initproc->p_cwdi->cwdi_cdir = rootvnode;
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VREF(initproc->p_cwdi->cwdi_cdir);
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initproc->p_cwdi->cwdi_rdir = NULL;
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/*
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* Now can look at time, having had a chance to verify the time
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* from the file system. Reset p->p_rtime as it may have been
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* munched in mi_switch() after the time got set.
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*/
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proclist_lock_read();
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s = splsched();
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for (p = LIST_FIRST(&allproc); p != NULL;
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p = LIST_NEXT(p, p_list)) {
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p->p_stats->p_start = mono_time = boottime = time;
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if (p->p_cpu != NULL)
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p->p_cpu->ci_schedstate.spc_runtime = time;
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p->p_rtime.tv_sec = p->p_rtime.tv_usec = 0;
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}
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splx(s);
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proclist_unlock_read();
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/* Create the pageout daemon kernel thread. */
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uvm_swap_init();
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if (kthread_create1(uvm_pageout, NULL, NULL, "pagedaemon"))
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panic("fork pagedaemon");
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/* Create the process reaper kernel thread. */
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if (kthread_create1(reaper, NULL, NULL, "reaper"))
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panic("fork reaper");
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/* Create the filesystem syncer kernel thread. */
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if (kthread_create1(sched_sync, NULL, NULL, "ioflush"))
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panic("fork syncer");
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/* Create the aiodone daemon kernel thread. */
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if (kthread_create1(uvm_aiodone_daemon, NULL, NULL, "aiodoned"))
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panic("fork aiodoned");
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#if defined(MULTIPROCESSOR)
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/* Boot the secondary processors. */
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cpu_boot_secondary_processors();
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#endif
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|
|
|
/* Initialize exec structures */
|
|
exec_init(1);
|
|
|
|
#ifndef PIPE_SOCKETPAIR
|
|
/* Initialize pipe structures */
|
|
pipe_init();
|
|
#endif
|
|
|
|
/*
|
|
* Okay, now we can let init(8) exec! It's off to userland!
|
|
*/
|
|
start_init_exec = 1;
|
|
wakeup((void *)&start_init_exec);
|
|
|
|
/* The scheduler is an infinite loop. */
|
|
uvm_scheduler();
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
static void
|
|
check_console(struct proc *p)
|
|
{
|
|
struct nameidata nd;
|
|
int error;
|
|
|
|
NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "/dev/console", p);
|
|
error = namei(&nd);
|
|
if (error == 0)
|
|
vrele(nd.ni_vp);
|
|
else if (error == ENOENT)
|
|
printf("warning: no /dev/console\n");
|
|
else
|
|
printf("warning: lookup /dev/console: error %d\n", error);
|
|
}
|
|
|
|
/*
|
|
* List of paths to try when searching for "init".
|
|
*/
|
|
static const char *initpaths[] = {
|
|
"/sbin/init",
|
|
"/sbin/oinit",
|
|
"/sbin/init.bak",
|
|
NULL,
|
|
};
|
|
|
|
/*
|
|
* Start the initial user process; try exec'ing each pathname in "initpaths".
|
|
* The program is invoked with one argument containing the boot flags.
|
|
*/
|
|
static void
|
|
start_init(void *arg)
|
|
{
|
|
struct proc *p = arg;
|
|
vaddr_t addr;
|
|
struct sys_execve_args /* {
|
|
syscallarg(const char *) path;
|
|
syscallarg(char * const *) argp;
|
|
syscallarg(char * const *) envp;
|
|
} */ args;
|
|
int options, i, error;
|
|
register_t retval[2];
|
|
char flags[4], *flagsp;
|
|
const char *path, *slash;
|
|
char *ucp, **uap, *arg0, *arg1 = NULL;
|
|
char ipath[129];
|
|
int ipx, len;
|
|
|
|
/*
|
|
* Now in process 1.
|
|
*/
|
|
strncpy(p->p_comm, "init", MAXCOMLEN);
|
|
|
|
/*
|
|
* Wait for main() to tell us that it's safe to exec.
|
|
*/
|
|
while (start_init_exec == 0)
|
|
(void) tsleep((void *)&start_init_exec, PWAIT, "initexec", 0);
|
|
|
|
/*
|
|
* This is not the right way to do this. We really should
|
|
* hand-craft a descriptor onto /dev/console to hand to init,
|
|
* but that's a _lot_ more work, and the benefit from this easy
|
|
* hack makes up for the "good is the enemy of the best" effect.
|
|
*/
|
|
check_console(p);
|
|
|
|
/*
|
|
* Need just enough stack to hold the faked-up "execve()" arguments.
|
|
*/
|
|
addr = USRSTACK - PAGE_SIZE;
|
|
if (uvm_map(&p->p_vmspace->vm_map, &addr, PAGE_SIZE,
|
|
NULL, UVM_UNKNOWN_OFFSET, 0,
|
|
UVM_MAPFLAG(UVM_PROT_ALL, UVM_PROT_ALL, UVM_INH_COPY,
|
|
UVM_ADV_NORMAL,
|
|
UVM_FLAG_FIXED|UVM_FLAG_OVERLAY|UVM_FLAG_COPYONW)) != 0)
|
|
panic("init: couldn't allocate argument space");
|
|
p->p_vmspace->vm_maxsaddr = (caddr_t)addr;
|
|
|
|
ipx = 0;
|
|
while (1) {
|
|
if (boothowto & RB_ASKNAME) {
|
|
printf("init path");
|
|
if (initpaths[ipx])
|
|
printf(" (default %s)", initpaths[ipx]);
|
|
printf(": ");
|
|
len = cngetsn(ipath, sizeof(ipath)-1);
|
|
if (len == 0) {
|
|
if (initpaths[ipx])
|
|
path = initpaths[ipx++];
|
|
else
|
|
continue;
|
|
} else {
|
|
ipath[len] = '\0';
|
|
path = ipath;
|
|
}
|
|
} else {
|
|
if ((path = initpaths[ipx++]) == NULL)
|
|
break;
|
|
}
|
|
|
|
ucp = (char *)(addr + PAGE_SIZE);
|
|
|
|
/*
|
|
* Construct the boot flag argument.
|
|
*/
|
|
flagsp = flags;
|
|
*flagsp++ = '-';
|
|
options = 0;
|
|
|
|
if (boothowto & RB_SINGLE) {
|
|
*flagsp++ = 's';
|
|
options = 1;
|
|
}
|
|
#ifdef notyet
|
|
if (boothowto & RB_FASTBOOT) {
|
|
*flagsp++ = 'f';
|
|
options = 1;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Move out the flags (arg 1), if necessary.
|
|
*/
|
|
if (options != 0) {
|
|
*flagsp++ = '\0';
|
|
i = flagsp - flags;
|
|
#ifdef DEBUG
|
|
printf("init: copying out flags `%s' %d\n", flags, i);
|
|
#endif
|
|
(void)copyout((caddr_t)flags, (caddr_t)(ucp -= i), i);
|
|
arg1 = ucp;
|
|
}
|
|
|
|
/*
|
|
* Move out the file name (also arg 0).
|
|
*/
|
|
i = strlen(path) + 1;
|
|
#ifdef DEBUG
|
|
printf("init: copying out path `%s' %d\n", path, i);
|
|
#else
|
|
if (boothowto & RB_ASKNAME || path != initpaths[0])
|
|
printf("init: trying %s\n", path);
|
|
#endif
|
|
(void)copyout((caddr_t)path, (caddr_t)(ucp -= i), i);
|
|
arg0 = ucp;
|
|
|
|
/*
|
|
* Move out the arg pointers.
|
|
*/
|
|
uap = (char **)((long)ucp & ~ALIGNBYTES);
|
|
(void)suword((caddr_t)--uap, 0); /* terminator */
|
|
if (options != 0)
|
|
(void)suword((caddr_t)--uap, (long)arg1);
|
|
slash = strrchr(path, '/');
|
|
if (slash)
|
|
(void)suword((caddr_t)--uap,
|
|
(long)arg0 + (slash + 1 - path));
|
|
else
|
|
(void)suword((caddr_t)--uap, (long)arg0);
|
|
|
|
/*
|
|
* Point at the arguments.
|
|
*/
|
|
SCARG(&args, path) = arg0;
|
|
SCARG(&args, argp) = uap;
|
|
SCARG(&args, envp) = NULL;
|
|
|
|
/*
|
|
* Now try to exec the program. If can't for any reason
|
|
* other than it doesn't exist, complain.
|
|
*/
|
|
error = sys_execve(p, &args, retval);
|
|
if (error == 0 || error == EJUSTRETURN) {
|
|
KERNEL_PROC_UNLOCK(p);
|
|
return;
|
|
}
|
|
printf("exec %s: error %d\n", path, error);
|
|
}
|
|
printf("init: not found\n");
|
|
panic("no init");
|
|
}
|