726 lines
17 KiB
C
726 lines
17 KiB
C
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/* $OpenBSD: init_main.c,v 1.320 2023/01/01 07:00:51 jsg Exp $ */
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/* $NetBSD: init_main.c,v 1.84.4.1 1996/06/02 09:08:06 mrg 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. 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 8.9 (Berkeley) 1/21/94
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*/
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#include <sys/param.h>
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#include <sys/filedesc.h>
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#include <sys/errno.h>
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#include <sys/kthread.h>
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#include <sys/mount.h>
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#include <sys/proc.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/namei.h>
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#include <sys/vnode.h>
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#include <sys/tty.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/lockf.h>
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#include <sys/reboot.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/event.h>
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#include <sys/msgbuf.h>
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#include <sys/mbuf.h>
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#include <sys/pipe.h>
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#include <sys/witness.h>
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#include <sys/smr.h>
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#include <sys/evcount.h>
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#include <sys/syscallargs.h>
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#include <uvm/uvm_extern.h>
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#include <net/if.h>
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#include <net/rtable.h>
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#if defined(CRYPTO)
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#include <crypto/cryptodev.h>
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#include <crypto/cryptosoft.h>
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#endif
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#if defined(KUBSAN)
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extern void kubsan_init(void);
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#endif
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#if defined(NFSSERVER) || defined(NFSCLIENT)
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extern void nfs_init(void);
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#endif
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#include "stoeplitz.h"
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#if NSTOEPLITZ > 0
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extern void stoeplitz_init(void);
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#endif
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#include "mpath.h"
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#include "vscsi.h"
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#include "softraid.h"
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const char copyright[] =
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"Copyright (c) 1982, 1986, 1989, 1991, 1993\n"
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"\tThe Regents of the University of California. All rights reserved.\n"
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"Copyright (c) 1995-2023 OpenBSD. All rights reserved. https://www.OpenBSD.org\n"
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"Copyright (c) 2018-2023 SecBSD. All rights reserved. https://secbsd.org\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 process process0;
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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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struct process *initprocess;
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struct proc *reaperproc;
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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 db_active = 0;
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int ncpus = 1;
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int ncpusfound = 1; /* number of cpus we find */
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volatile int start_init_exec; /* semaphore for start_init() */
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#if !defined(NO_PROPOLICE)
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long __guard_local __attribute__((section(".openbsd.randomdata")));
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#endif
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/* XXX return int so gcc -Werror won't complain */
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int main(void *);
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void check_console(struct proc *);
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void start_init(void *);
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void db_ctf_init(void);
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void prof_init(void);
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void init_exec(void);
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void futex_init(void);
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void taskq_init(void);
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void timeout_proc_init(void);
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void pool_gc_pages(void *);
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void percpu_init(void);
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#ifdef DIAGNOSTIC
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int pdevinit_done = 0;
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#endif
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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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/* XXX return int, so gcc -Werror won't complain */
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int
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main(void *framep)
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{
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struct proc *p;
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struct process *pr;
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struct pdevinit *pdev;
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extern struct pdevinit pdevinit[];
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extern void disk_init(void);
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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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curproc = p = &proc0;
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p->p_cpu = curcpu();
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/*
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* Initialize timeouts.
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*/
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timeout_startup();
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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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config_init(); /* init autoconfiguration data structures */
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consinit();
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printf("%s\n", copyright);
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#ifdef KUBSAN
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/* Initialize kubsan. */
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kubsan_init();
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#endif
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WITNESS_INITIALIZE();
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KERNEL_LOCK_INIT();
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SCHED_LOCK_INIT();
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rw_obj_init();
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uvm_init();
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disk_init(); /* must come before autoconfiguration */
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tty_init(); /* initialise tty's */
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cpu_startup();
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random_start(boothowto & RB_GOODRANDOM); /* Start the flow */
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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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#if NSTOEPLITZ > 0
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stoeplitz_init();
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#endif
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/* Initialize sockets. */
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soinit();
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/* Initialize SRP subsystem. */
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srp_startup();
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/* Initialize SMR subsystem. */
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smr_startup();
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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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/* Initialize file locking. */
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lf_init();
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/*
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* Initialize filedescriptors.
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*/
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filedesc_init();
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/*
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* Initialize pipes.
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*/
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pipe_init();
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/*
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* Initialize kqueues.
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*/
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kqueue_init();
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/*
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* Initialize futexes.
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*/
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futex_init();
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/* Create credentials. */
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p->p_ucred = crget();
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p->p_ucred->cr_ngroups = 1; /* group 0 */
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/*
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* Create process 0 (the swapper).
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*/
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pr = &process0;
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process_initialize(pr, p);
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LIST_INSERT_HEAD(&allprocess, pr, ps_list);
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LIST_INSERT_HEAD(PIDHASH(0), pr, ps_hash);
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atomic_setbits_int(&pr->ps_flags, PS_SYSTEM);
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/* Set the default routing table/domain. */
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process0.ps_rtableid = 0;
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LIST_INSERT_HEAD(&allproc, p, p_list);
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pr->ps_pgrp = &pgrp0;
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LIST_INSERT_HEAD(TIDHASH(0), p, p_hash);
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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, pr, ps_pglist);
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pgrp0.pg_session = &session0;
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session0.s_count = 1;
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session0.s_leader = pr;
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atomic_setbits_int(&p->p_flag, P_SYSTEM);
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p->p_stat = SONPROC;
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pr->ps_nice = NZERO;
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strlcpy(pr->ps_comm, "swapper", sizeof(pr->ps_comm));
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/* Init timeouts. */
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timeout_set(&p->p_sleep_to, endtsleep, p);
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/* Initialize signal state for process 0. */
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signal_init();
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siginit(&sigacts0);
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pr->ps_sigacts = &sigacts0;
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/* Create the file descriptor table. */
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p->p_fd = pr->ps_fd = fdinit();
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/* Create the limits structures. */
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lim_startup(&limit0);
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pr->ps_limit = &limit0;
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/* Allocate a prototype map so we have something to fork. */
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uvmspace_init(&vmspace0, pmap_kernel(), round_page(VM_MIN_ADDRESS),
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trunc_page(VM_MAX_ADDRESS), TRUE, TRUE);
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p->p_vmspace = pr->ps_vmspace = &vmspace0;
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p->p_addr = proc0paddr; /* XXX */
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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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/* Initialize run queues */
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sched_init_runqueues();
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sleep_queue_init();
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sched_init_cpu(curcpu());
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p->p_cpu->ci_randseed = (arc4random() & 0x7fffffff) + 1;
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/* Initialize timeouts in process context. */
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timeout_proc_init();
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/* Initialize task queues */
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taskq_init();
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/* Initialize the interface/address trees */
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ifinit();
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/* Lock the kernel on behalf of proc0. */
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KERNEL_LOCK();
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#if NMPATH > 0
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/* Attach mpath before hardware */
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config_rootfound("mpath", NULL);
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#endif
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/* Configure the devices */
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cpu_configure();
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/* Configure virtual memory system, set vm rlimits. */
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uvm_init_limits(&limit0);
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/* Per CPU memory allocation */
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percpu_init();
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/* Initialize the file systems. */
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#if defined(NFSSERVER) || defined(NFSCLIENT)
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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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/* Create default routing table before attaching lo0. */
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rtable_init();
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/* Attach pseudo-devices. */
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for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++)
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if (pdev->pdev_count > 0)
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(*pdev->pdev_attach)(pdev->pdev_count);
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#ifdef DIAGNOSTIC
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pdevinit_done = 1;
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#endif
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#ifdef CRYPTO
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crypto_init();
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swcr_init();
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#endif /* CRYPTO */
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/*
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* Initialize protocols.
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*/
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domaininit();
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initconsbuf();
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#if defined(GPROF) || defined(DDBPROF)
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/* Initialize kernel profiling. */
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prof_init();
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#endif
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/* Enable per-CPU data. */
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mbcpuinit();
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kqueue_init_percpu();
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uvm_init_percpu();
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evcount_init_percpu();
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/* init exec */
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init_exec();
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/* Start the scheduler */
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scheduler_start();
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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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{
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struct proc *initproc;
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if (fork1(p, FORK_FORK, start_init, NULL, NULL, &initproc))
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panic("fork init");
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initprocess = initproc->p_p;
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}
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/*
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* Create any kernel threads whose creation was deferred because
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* initprocess 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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tsleep_nsec(&config_pending, PWAIT, "cfpend", INFSLP);
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dostartuphooks();
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#if NVSCSI > 0
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config_rootfound("vscsi", NULL);
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#endif
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#if NSOFTRAID > 0
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config_rootfound("softraid", NULL);
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#endif
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/* Configure root/swap devices */
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diskconf();
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#ifdef DDB
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/* Make debug symbols available in ddb. */
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db_ctf_init();
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#endif
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if (mountroot == NULL || ((*mountroot)() != 0))
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panic("cannot mount root");
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TAILQ_FIRST(&mountlist)->mnt_flag |= MNT_ROOTFS;
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/* Get the vnode for '/'. Set p->p_fd->fd_cdir to reference it. */
|
||
|
if (VFS_ROOT(TAILQ_FIRST(&mountlist), &rootvnode))
|
||
|
panic("cannot find root vnode");
|
||
|
p->p_fd->fd_cdir = rootvnode;
|
||
|
vref(p->p_fd->fd_cdir);
|
||
|
VOP_UNLOCK(rootvnode);
|
||
|
p->p_fd->fd_rdir = NULL;
|
||
|
|
||
|
/*
|
||
|
* Now that root is mounted, we can fixup initprocess's CWD
|
||
|
* info. All other processes are kthreads, which merely
|
||
|
* share proc0's CWD info.
|
||
|
*/
|
||
|
initprocess->ps_fd->fd_cdir = rootvnode;
|
||
|
vref(initprocess->ps_fd->fd_cdir);
|
||
|
initprocess->ps_fd->fd_rdir = NULL;
|
||
|
|
||
|
/*
|
||
|
* Now can look at time, having had a chance to verify the time
|
||
|
* from the file system. Reset p->p_rtime as it may have been
|
||
|
* munched in mi_switch() after the time got set.
|
||
|
*/
|
||
|
LIST_FOREACH(pr, &allprocess, ps_list) {
|
||
|
nanouptime(&pr->ps_start);
|
||
|
TAILQ_FOREACH(p, &pr->ps_threads, p_thr_link) {
|
||
|
nanouptime(&p->p_cpu->ci_schedstate.spc_runtime);
|
||
|
timespecclear(&p->p_rtime);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
uvm_swap_init();
|
||
|
|
||
|
/* Create the pageout daemon kernel thread. */
|
||
|
if (kthread_create(uvm_pageout, NULL, NULL, "pagedaemon"))
|
||
|
panic("fork pagedaemon");
|
||
|
|
||
|
/* Create the reaper daemon kernel thread. */
|
||
|
if (kthread_create(reaper, NULL, &reaperproc, "reaper"))
|
||
|
panic("fork reaper");
|
||
|
|
||
|
/* Create the cleaner daemon kernel thread. */
|
||
|
if (kthread_create(buf_daemon, NULL, &cleanerproc, "cleaner"))
|
||
|
panic("fork cleaner");
|
||
|
|
||
|
/* Create the update daemon kernel thread. */
|
||
|
if (kthread_create(syncer_thread, NULL, &syncerproc, "update"))
|
||
|
panic("fork update");
|
||
|
|
||
|
/* Create the aiodone daemon kernel thread. */
|
||
|
if (kthread_create(uvm_aiodone_daemon, NULL, NULL, "aiodoned"))
|
||
|
panic("fork aiodoned");
|
||
|
|
||
|
#if !defined(__hppa__)
|
||
|
/* Create the page zeroing kernel thread. */
|
||
|
if (kthread_create(uvm_pagezero_thread, NULL, NULL, "zerothread"))
|
||
|
panic("fork zerothread");
|
||
|
#endif
|
||
|
|
||
|
#if defined(MULTIPROCESSOR)
|
||
|
/* Boot the secondary processors. */
|
||
|
cpu_boot_secondary_processors();
|
||
|
#endif
|
||
|
|
||
|
/* Now that all CPUs partake in scheduling, start SMR thread. */
|
||
|
smr_startup_thread();
|
||
|
|
||
|
config_process_deferred_mountroot();
|
||
|
|
||
|
/*
|
||
|
* Okay, now we can let init(8) exec! It's off to userland!
|
||
|
*/
|
||
|
start_init_exec = 1;
|
||
|
wakeup((void *)&start_init_exec);
|
||
|
|
||
|
/*
|
||
|
* Start the idle pool page garbage collector
|
||
|
*/
|
||
|
#if !(defined(__m88k__) && defined(MULTIPROCESSOR)) /* XXX */
|
||
|
pool_gc_pages(NULL);
|
||
|
#endif
|
||
|
|
||
|
start_periodic_resettodr();
|
||
|
|
||
|
/*
|
||
|
* proc0: nothing to do, back to sleep
|
||
|
*/
|
||
|
while (1)
|
||
|
tsleep_nsec(&proc0, PVM, "scheduler", INFSLP);
|
||
|
/* NOTREACHED */
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* List of paths to try when searching for "init".
|
||
|
*/
|
||
|
static char *initpaths[] = {
|
||
|
"/sbin/init",
|
||
|
"/sbin/oinit",
|
||
|
"/sbin/init.bak",
|
||
|
NULL,
|
||
|
};
|
||
|
|
||
|
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) {
|
||
|
if (error == ENOENT)
|
||
|
printf("warning: /dev/console does not exist\n");
|
||
|
else
|
||
|
printf("warning: /dev/console error %d\n", error);
|
||
|
} else
|
||
|
vrele(nd.ni_vp);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Start the initial user process; try exec'ing each pathname in "initpaths".
|
||
|
* The program is invoked with one argument containing the boot flags.
|
||
|
*/
|
||
|
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, error;
|
||
|
long i;
|
||
|
register_t retval[2];
|
||
|
char flags[4], *flagsp;
|
||
|
char **pathp, *path, *ucp, **uap, *arg0, *arg1 = NULL;
|
||
|
|
||
|
/*
|
||
|
* Now in process 1.
|
||
|
*/
|
||
|
|
||
|
/*
|
||
|
* Wait for main() to tell us that it's safe to exec.
|
||
|
*/
|
||
|
while (start_init_exec == 0)
|
||
|
tsleep_nsec(&start_init_exec, PWAIT, "initexec", INFSLP);
|
||
|
|
||
|
check_console(p);
|
||
|
|
||
|
/* process 0 ignores SIGCHLD, but we can't */
|
||
|
p->p_p->ps_sigacts->ps_sigflags = 0;
|
||
|
|
||
|
/*
|
||
|
* Need just enough stack to hold the faked-up "execve()" arguments.
|
||
|
*/
|
||
|
#ifdef MACHINE_STACK_GROWS_UP
|
||
|
addr = USRSTACK;
|
||
|
#else
|
||
|
addr = USRSTACK - PAGE_SIZE;
|
||
|
#endif
|
||
|
p->p_vmspace->vm_maxsaddr = (caddr_t)addr;
|
||
|
p->p_vmspace->vm_minsaddr = (caddr_t)(addr + PAGE_SIZE);
|
||
|
if (uvm_map(&p->p_vmspace->vm_map, &addr, PAGE_SIZE,
|
||
|
NULL, UVM_UNKNOWN_OFFSET, 0,
|
||
|
UVM_MAPFLAG(PROT_READ | PROT_WRITE, PROT_MASK, MAP_INHERIT_COPY,
|
||
|
MADV_NORMAL,
|
||
|
UVM_FLAG_FIXED|UVM_FLAG_OVERLAY|UVM_FLAG_COPYONW|UVM_FLAG_STACK|UVM_FLAG_SYSCALL)))
|
||
|
panic("init: couldn't allocate argument space");
|
||
|
|
||
|
for (pathp = &initpaths[0]; (path = *pathp) != NULL; pathp++) {
|
||
|
#ifdef MACHINE_STACK_GROWS_UP
|
||
|
ucp = (char *)addr;
|
||
|
#else
|
||
|
ucp = (char *)(addr + PAGE_SIZE);
|
||
|
#endif
|
||
|
/*
|
||
|
* 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' %ld\n", flags, i);
|
||
|
#endif
|
||
|
#ifdef MACHINE_STACK_GROWS_UP
|
||
|
arg1 = ucp;
|
||
|
(void)copyout((caddr_t)flags, (caddr_t)ucp, i);
|
||
|
ucp += i;
|
||
|
#else
|
||
|
(void)copyout((caddr_t)flags, (caddr_t)(ucp -= i), i);
|
||
|
arg1 = ucp;
|
||
|
#endif
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Move out the file name (also arg 0).
|
||
|
*/
|
||
|
i = strlen(path) + 1;
|
||
|
#ifdef DEBUG
|
||
|
printf("init: copying out path `%s' %ld\n", path, i);
|
||
|
#endif
|
||
|
#ifdef MACHINE_STACK_GROWS_UP
|
||
|
arg0 = ucp;
|
||
|
(void)copyout((caddr_t)path, (caddr_t)ucp, i);
|
||
|
ucp += i;
|
||
|
ucp = (caddr_t)ALIGN((u_long)ucp);
|
||
|
uap = (char **)ucp + 3;
|
||
|
#else
|
||
|
(void)copyout((caddr_t)path, (caddr_t)(ucp -= i), i);
|
||
|
arg0 = ucp;
|
||
|
uap = (char **)((u_long)ucp & ~ALIGNBYTES);
|
||
|
#endif
|
||
|
|
||
|
/*
|
||
|
* Move out the arg pointers.
|
||
|
*/
|
||
|
i = 0;
|
||
|
copyout(&i, (caddr_t)--uap, sizeof(register_t)); /* terminator */
|
||
|
if (options != 0)
|
||
|
copyout(&arg1, (caddr_t)--uap, sizeof(register_t));
|
||
|
copyout(&arg0, (caddr_t)--uap, sizeof(register_t));
|
||
|
|
||
|
/*
|
||
|
* 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.
|
||
|
*/
|
||
|
if ((error = sys_execve(p, &args, retval)) == EJUSTRETURN) {
|
||
|
KERNEL_UNLOCK();
|
||
|
return;
|
||
|
}
|
||
|
if (error != ENOENT)
|
||
|
printf("exec %s: error %d\n", path, error);
|
||
|
}
|
||
|
printf("init: not found\n");
|
||
|
panic("no init");
|
||
|
}
|