c10a926030
the child inherits the stack pointer from the parent (traditional behavior). Like the signal stack, the stack area is secified as a low address and a size; machine-dependent code accounts for stack direction. This is required for clone(2).
598 lines
15 KiB
C
598 lines
15 KiB
C
/* $NetBSD: init_main.c,v 1.151 1999/05/13 21:58:37 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 "fs_nfs.h"
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#include "opt_nfsserver.h"
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#include "opt_sysv.h"
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#include "rnd.h"
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#include <sys/param.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/exec.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/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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#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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#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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#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 <machine/cpu.h>
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#include <vm/vm.h>
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#include <vm/vm_pageout.h>
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#include <uvm/uvm.h>
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#include <net/if.h>
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#include <net/raw_cb.h>
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char copyright[] = "\
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Copyright (c) 1996, 1997, 1998, 1999
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The NetBSD Foundation, Inc. All rights reserved.
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Copyright (c) 1982, 1986, 1989, 1991, 1993
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The Regents of the University of California. All rights reserved.
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";
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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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struct timeval boottime;
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struct timeval runtime;
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static void check_console __P((struct proc *p));
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static void start_init __P((void *));
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static void start_pagedaemon __P((void *));
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static void start_reaper __P((void *));
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void main __P((void));
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extern char sigcode[], esigcode[];
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#ifdef SYSCALL_DEBUG
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extern char *syscallnames[];
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#endif
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struct emul emul_netbsd = {
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"netbsd",
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NULL,
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sendsig,
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SYS_syscall,
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SYS_MAXSYSCALL,
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sysent,
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#ifdef SYSCALL_DEBUG
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syscallnames,
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#else
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NULL,
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#endif
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0,
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copyargs,
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setregs,
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sigcode,
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esigcode,
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};
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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()
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{
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struct proc *p;
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struct pdevinit *pdev;
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int i, s, error;
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extern struct pdevinit pdevinit[];
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extern void roundrobin __P((void *));
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extern void schedcpu __P((void *));
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extern void disk_init __P((void));
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#if defined(NFSSERVER) || defined(NFS)
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extern void nfs_init __P((void));
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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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/*
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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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uvm_init();
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/* Do machine-dependent initialization. */
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cpu_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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disk_init(); /* must come before autoconfiguration */
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tty_init(); /* initialise tty list */
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#if NRND > 0
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rnd_init();
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#endif
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config_init(); /* init autoconfiguration data structures */
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configure(); /* ...and configure the hardware */
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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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LIST_INSERT_HEAD(&allproc, p, p_list);
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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 = SRUN;
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p->p_nice = NZERO;
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p->p_emul = &emul_netbsd;
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strncpy(p->p_comm, "swapper", MAXCOMLEN);
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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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i = ptoa(uvmexp.free);
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limit0.pl_rlimit[RLIMIT_RSS].rlim_max = i;
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limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_max = i;
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limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = i / 3;
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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), TRUE);
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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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vfsinit();
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/* Start real time and statistics clocks. */
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initclocks();
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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 = splimp();
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ifinit();
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domaininit();
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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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/* Kick off timeout driven events by calling first time. */
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roundrobin(NULL);
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schedcpu(NULL);
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/* Determine the root and dump devices. */
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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, NULL);
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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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uvm_swap_init();
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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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p->p_stats->p_start = runtime = mono_time = boottime = time;
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p->p_rtime.tv_sec = p->p_rtime.tv_usec = 0;
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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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/* Create process 1 (init(8)). */
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if (fork1(p, 0, SIGCHLD, NULL, 0, NULL, &initproc))
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panic("fork init");
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cpu_set_kpc(initproc, start_init, initproc);
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/* Create process 2, the pageout daemon kernel thread. */
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if (kthread_create(start_pagedaemon, NULL, NULL, "pagedaemon"))
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panic("fork pagedaemon");
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/* Create process 3, the process reaper kernel thread. */
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if (kthread_create(start_reaper, NULL, NULL, "reaper"))
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panic("fork reaper");
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/* Create any other deferred kernel threads. */
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kthread_run_deferred_queue();
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/* The scheduler is an infinite loop. */
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uvm_scheduler();
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/* NOTREACHED */
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}
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static void
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check_console(p)
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struct proc *p;
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{
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struct nameidata nd;
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int error;
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NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "/dev/console", p);
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error = namei(&nd);
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if (error == 0)
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vrele(nd.ni_vp);
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else if (error == ENOENT)
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printf("warning: no /dev/console\n");
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else
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printf("warning: lookup /dev/console: error %d\n", error);
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}
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/*
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* List of paths to try when searching for "init".
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*/
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static char *initpaths[] = {
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"/sbin/init",
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"/sbin/oinit",
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"/sbin/init.bak",
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NULL,
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};
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/*
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* Start the initial user process; try exec'ing each pathname in "initpaths".
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* The program is invoked with one argument containing the boot flags.
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*/
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static void
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start_init(arg)
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void *arg;
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{
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struct proc *p = arg;
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vaddr_t addr;
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struct sys_execve_args /* {
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syscallarg(const char *) path;
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syscallarg(char * const *) argp;
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syscallarg(char * const *) envp;
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} */ args;
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int options, i, error;
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register_t retval[2];
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char flags[4], *flagsp;
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char **pathp, *path, *slash, *ucp, **uap, *arg0, *arg1 = NULL;
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/*
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* Now in process 1.
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*/
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strncpy(p->p_comm, "init", MAXCOMLEN);
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/*
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* This is not the right way to do this. We really should
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* hand-craft a descriptor onto /dev/console to hand to init,
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* but that's a _lot_ more work, and the benefit from this easy
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* hack makes up for the "good is the enemy of the best" effect.
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*/
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check_console(p);
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/*
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* Need just enough stack to hold the faked-up "execve()" arguments.
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*/
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addr = USRSTACK - PAGE_SIZE;
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if (uvm_map(&p->p_vmspace->vm_map, &addr, PAGE_SIZE,
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NULL, UVM_UNKNOWN_OFFSET,
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UVM_MAPFLAG(UVM_PROT_ALL, UVM_PROT_ALL, UVM_INH_COPY,
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UVM_ADV_NORMAL,
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UVM_FLAG_FIXED|UVM_FLAG_OVERLAY|UVM_FLAG_COPYONW))
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!= KERN_SUCCESS)
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panic("init: couldn't allocate argument space");
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p->p_vmspace->vm_maxsaddr = (caddr_t)addr;
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for (pathp = &initpaths[0]; (path = *pathp) != NULL; pathp++) {
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ucp = (char *)(addr + PAGE_SIZE);
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/*
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* Construct the boot flag argument.
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*/
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flagsp = flags;
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*flagsp++ = '-';
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options = 0;
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if (boothowto & RB_SINGLE) {
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*flagsp++ = 's';
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options = 1;
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}
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#ifdef notyet
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if (boothowto & RB_FASTBOOT) {
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*flagsp++ = 'f';
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options = 1;
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}
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#endif
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/*
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* Move out the flags (arg 1), if necessary.
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*/
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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);
|
|
#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)
|
|
return;
|
|
if (error != ENOENT)
|
|
printf("exec %s: error %d\n", path, error);
|
|
}
|
|
printf("init: not found\n");
|
|
panic("no init");
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static void
|
|
start_pagedaemon(arg)
|
|
void *arg;
|
|
{
|
|
|
|
uvm_pageout();
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static void
|
|
start_reaper(arg)
|
|
void *arg;
|
|
{
|
|
|
|
reaper();
|
|
/* NOTREACHED */
|
|
}
|