674 lines
18 KiB
C
674 lines
18 KiB
C
/*
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* Copyright (c) 1995 Terrence R. Lambert
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* All rights reserved.
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*
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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 8.9 (Berkeley) 1/21/94
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* $Id: init_main.c,v 1.73 1997/11/06 19:29:07 phk Exp $
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*/
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#include "opt_devfs.h"
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#include <sys/param.h>
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#include <sys/file.h>
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#include <sys/filedesc.h>
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#include <sys/kernel.h>
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#include <sys/mount.h>
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#include <sys/sysctl.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/vnode.h>
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#include <sys/sysent.h>
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#include <sys/reboot.h>
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#include <sys/sysproto.h>
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#include <sys/vmmeter.h>
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#include <machine/cpu.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <vm/vm_prot.h>
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#include <sys/lock.h>
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#include <vm/pmap.h>
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#include <vm/vm_map.h>
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#include <sys/user.h>
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#include <sys/copyright.h>
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extern struct linker_set sysinit_set; /* XXX */
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extern void __main __P((void));
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extern void main __P((void *framep));
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extern void secondary_main __P((void));
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/* Components of the first process -- never freed. */
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static struct session session0;
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static struct pgrp pgrp0;
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struct proc proc0;
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static struct pcred cred0;
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static struct filedesc0 filedesc0;
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static struct plimit limit0;
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static struct vmspace vmspace0;
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#ifndef SMP /* per-cpu on smp */
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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;
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int boothowto;
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struct timeval boottime;
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SYSCTL_STRUCT(_kern, KERN_BOOTTIME, boottime,
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CTLFLAG_RW, &boottime, timeval, "");
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static int shutdowntimeout = 120;
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SYSCTL_INT(_kern, OID_AUTO, shutdown_timeout,
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CTLFLAG_RW, &shutdowntimeout, 0, "");
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#ifndef SMP /* per-cpu on smp */
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struct timeval runtime;
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#endif
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/*
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* Promiscuous argument pass for start_init()
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*
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* This is a kludge because we use a return from main() rather than a call
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* to a new routine in locore.s to kick the kernel alive from locore.s.
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*/
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static void *init_framep;
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#if __GNUC__ >= 2
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void __main() {}
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#endif
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/*
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* This ensures that there is at least one entry so that the sysinit_set
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* symbol is not undefined. A sybsystem ID of SI_SUB_DUMMY is never
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* executed.
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*/
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SYSINIT(placeholder, SI_SUB_DUMMY,SI_ORDER_ANY, NULL, NULL)
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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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* This allows simple addition of new kernel subsystems that require
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* boot time initialization. It also allows substitution of subsystem
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* (for instance, a scheduler, kernel profiler, or VM system) by object
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* module. Finally, it allows for optional "kernel threads", like an LFS
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* cleaner.
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*/
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void
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main(framep)
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void *framep;
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{
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register struct sysinit **sipp; /* system initialization*/
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register struct sysinit **xipp; /* interior loop of sort*/
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register struct sysinit *save; /* bubble*/
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/*
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* Copy the locore.s frame pointer for proc0, this is forked into
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* all other processes.
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*/
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init_framep = framep;
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#ifdef SMP
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/*
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* XXX curproc is per-cpu in SMP, and exists in freshly mapped pages,
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* so its value must be initialized now before it is used by various
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* initialization routines. proc0_init() isn't soon enough:
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* among other things, configure() is called first, and may call
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* setdumpdev(), which panics without a valid curproc.
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*/
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curproc = &proc0;
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#endif /* SMP */
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/*
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* Perform a bubble sort of the system initialization objects by
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* their subsystem (primary key) and order (secondary key).
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*
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* Since some things care about execution order, this is the
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* operation which ensures continued function.
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*/
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for( sipp = (struct sysinit **)sysinit_set.ls_items; *sipp; sipp++) {
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for( xipp = sipp + 1; *xipp; xipp++) {
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if( (*sipp)->subsystem < (*xipp)->subsystem ||
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( (*sipp)->subsystem == (*xipp)->subsystem &&
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(*sipp)->order < (*xipp)->order))
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continue; /* skip*/
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save = *sipp;
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*sipp = *xipp;
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*xipp = save;
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}
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}
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/*
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* Traverse the (now) ordered list of system initialization tasks.
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* Perform each task, and continue on to the next task.
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*
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* The last item on the list is expected to be the scheduler,
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* which will not return.
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*/
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for( sipp = (struct sysinit **)sysinit_set.ls_items; *sipp; sipp++) {
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if( (*sipp)->subsystem == SI_SUB_DUMMY)
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continue; /* skip dummy task(s)*/
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switch( (*sipp)->type) {
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case SI_TYPE_DEFAULT:
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/* no special processing*/
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(*((*sipp)->func))( (*sipp)->udata);
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break;
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case SI_TYPE_KTHREAD:
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/* kernel thread*/
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if (fork(&proc0, NULL))
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panic("fork kernel process");
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cpu_set_fork_handler(pfind(proc0.p_retval[0]),
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(*sipp)->func, (*sipp)->udata);
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break;
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default:
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panic( "init_main: unrecognized init type");
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}
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}
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panic("Shouldn't get here!");
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/* NOTREACHED*/
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}
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/*
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* Start a kernel process. This is called after a fork() call in
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* main() in the file kern/init_main.c.
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*
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* This function is used to start "internal" daemons.
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*/
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/* ARGSUSED*/
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void
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kproc_start(udata)
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void *udata;
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{
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struct kproc_desc *kp = udata;
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struct proc *p = curproc;
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#ifdef DIAGNOSTIC
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printf("Start pid=%d <%s>\n",p->p_pid, kp->arg0);
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#endif
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/* save a global descriptor, if desired*/
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if( kp->global_procpp != NULL)
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*kp->global_procpp = p;
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/* this is a non-swapped system process*/
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p->p_flag |= P_INMEM | P_SYSTEM;
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/* set up arg0 for 'ps', et al*/
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strcpy( p->p_comm, kp->arg0);
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/* call the processes' main()...*/
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(*kp->func)();
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/* NOTREACHED */
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panic("kproc_start: %s", kp->arg0);
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}
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/*
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***************************************************************************
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****
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**** The following SYSINIT's belong elsewhere, but have not yet
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**** been moved.
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****
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***************************************************************************
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*/
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#ifdef OMIT
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/*
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* Handled by vfs_mountroot (bad idea) at this time... should be
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* done the same as 4.4Lite2.
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*/
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SYSINIT(swapinit, SI_SUB_SWAP, SI_ORDER_FIRST, swapinit, NULL)
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#endif /* OMIT*/
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static void print_caddr_t __P((void *data));
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static void
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print_caddr_t(data)
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void *data;
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{
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printf("%s", (char *)data);
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}
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SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t, copyright)
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/*
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***************************************************************************
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****
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**** The two following SYSINT's are proc0 specific glue code. I am not
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**** convinced that they can not be safely combined, but their order of
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**** operation has been maintained as the same as the original init_main.c
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**** for right now.
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****
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**** These probably belong in init_proc.c or kern_proc.c, since they
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**** deal with proc0 (the fork template process).
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****
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***************************************************************************
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*/
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/* ARGSUSED*/
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static void proc0_init __P((void *dummy));
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static void
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proc0_init(dummy)
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void *dummy;
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{
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register struct proc *p;
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register struct filedesc0 *fdp;
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register unsigned i;
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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; /* XXX redundant*/
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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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* Initialize sleep queue hash table
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*/
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sleepinit();
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/*
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* additional VM structures
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*/
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vm_init2();
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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_leader = p;
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p->p_sysent = &aout_sysvec;
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p->p_flag = P_INMEM | P_SYSTEM;
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p->p_stat = SRUN;
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p->p_nice = NZERO;
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p->p_rtprio.type = RTP_PRIO_NORMAL;
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p->p_rtprio.prio = 0;
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/*
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* Link for kernel based threads
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*/
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p->p_peers = 0;
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p->p_leader = p;
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bcopy("swapper", p->p_comm, sizeof ("swapper"));
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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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fdp = &filedesc0;
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p->p_fd = &fdp->fd_fd;
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fdp->fd_fd.fd_refcnt = 1;
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fdp->fd_fd.fd_cmask = cmask;
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fdp->fd_fd.fd_ofiles = fdp->fd_dfiles;
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fdp->fd_fd.fd_ofileflags = fdp->fd_dfileflags;
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fdp->fd_fd.fd_nfiles = NDFILE;
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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_cur =
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limit0.pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles;
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limit0.pl_rlimit[RLIMIT_NPROC].rlim_cur =
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limit0.pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc;
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i = ptoa(cnt.v_free_count);
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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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/* Allocate a prototype map so we have something to fork. */
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p->p_vmspace = &vmspace0;
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vmspace0.vm_refcnt = 1;
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pmap_pinit(&vmspace0.vm_pmap);
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vm_map_init(&vmspace0.vm_map, round_page(VM_MIN_ADDRESS),
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trunc_page(VM_MAXUSER_ADDRESS), TRUE);
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vmspace0.vm_map.pmap = &vmspace0.vm_pmap;
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p->p_addr = proc0paddr; /* XXX */
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#define INCOMPAT_LITES2
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#ifdef INCOMPAT_LITES2
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/*
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* proc0 needs to have a coherent frame base in it's stack.
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*/
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cpu_set_init_frame(p, init_framep); /* XXX! */
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#endif /* INCOMPAT_LITES2*/
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/*
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* We continue to place resource usage info and signal
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* actions in the 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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p->p_sigacts = &p->p_addr->u_sigacts;
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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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}
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SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL)
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/* ARGSUSED*/
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static void proc0_post __P((void *dummy));
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static void
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proc0_post(dummy)
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void *dummy;
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{
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struct timeval tv;
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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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gettime(&boottime);
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proc0.p_stats->p_start = runtime = mono_time = boottime;
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proc0.p_rtime.tv_sec = proc0.p_rtime.tv_usec = 0;
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/*
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* Give the ``random'' number generator a thump.
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*/
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microtime(&tv);
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srandom(tv.tv_sec ^ tv.tv_usec);
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/* Initialize signal state for process 0. */
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siginit(&proc0);
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}
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SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL)
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/*
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***************************************************************************
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****
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**** The following SYSINIT's and glue code should be moved to the
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**** respective files on a per subsystem basis.
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****
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***************************************************************************
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*/
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/* ARGSUSED */
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static void sched_setup __P((void *dummy));
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static void
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sched_setup(dummy)
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void *dummy;
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{
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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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}
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SYSINIT(sched_setup, SI_SUB_KICK_SCHEDULER, SI_ORDER_FIRST, sched_setup, NULL)
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/* ARGSUSED */
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static void root_conf __P((void *dummy));
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static void
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root_conf(dummy)
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void *dummy;
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{
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cpu_rootconf();
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}
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SYSINIT(root_conf, SI_SUB_ROOT_CONF, SI_ORDER_FIRST, root_conf, NULL)
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/* ARGSUSED */
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static void dump_conf __P((void *dummy));
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static void
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dump_conf(dummy)
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void *dummy;
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{
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cpu_dumpconf();
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}
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SYSINIT(dump_conf, SI_SUB_DUMP_CONF, SI_ORDER_FIRST, dump_conf, NULL)
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/* ARGSUSED*/
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static void xxx_vfs_mountroot __P((void *fsnamep));
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#ifdef BOOTP
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extern void bootpc_init __P((void));
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#endif
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static void
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xxx_vfs_mountroot(fsnamep)
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void *fsnamep;
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{
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/* XXX Add a separate SYSINIT entry */
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#ifdef BOOTP
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bootpc_init();
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#endif
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/* Mount the root file system. */
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if (vfs_mountrootfs(*((char **) fsnamep)))
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panic("cannot mount root");
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}
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SYSINIT(mountroot, SI_SUB_MOUNT_ROOT, SI_ORDER_FIRST, xxx_vfs_mountroot,
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&mountrootfsname)
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/* ARGSUSED*/
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static void xxx_vfs_root_fdtab __P((void *dummy));
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static void
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xxx_vfs_root_fdtab(dummy)
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void *dummy;
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{
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register struct filedesc0 *fdp = &filedesc0;
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|
|
/* Get the vnode for '/'. Set fdp->fd_fd.fd_cdir to reference it. */
|
|
if (VFS_ROOT(mountlist.cqh_first, &rootvnode))
|
|
panic("cannot find root vnode");
|
|
fdp->fd_fd.fd_cdir = rootvnode;
|
|
VREF(fdp->fd_fd.fd_cdir);
|
|
VOP_UNLOCK(rootvnode, 0, &proc0);
|
|
fdp->fd_fd.fd_rdir = NULL;
|
|
}
|
|
SYSINIT(retrofit, SI_SUB_ROOT_FDTAB, SI_ORDER_FIRST, xxx_vfs_root_fdtab, NULL)
|
|
|
|
|
|
/*
|
|
***************************************************************************
|
|
****
|
|
**** The following code probably belongs in another file, like
|
|
**** kern/init_init.c. It is here for two reasons only:
|
|
****
|
|
**** 1) This code returns to startup the system; this is
|
|
**** abnormal for a kernel thread.
|
|
**** 2) This code promiscuously uses init_frame
|
|
****
|
|
***************************************************************************
|
|
*/
|
|
|
|
static void kthread_init __P((void *dummy));
|
|
SYSINIT_KT(init,SI_SUB_KTHREAD_INIT, SI_ORDER_FIRST, kthread_init, NULL)
|
|
|
|
|
|
extern void prepare_usermode __P((void));
|
|
static void start_init __P((struct proc *p));
|
|
|
|
/* ARGSUSED*/
|
|
static void
|
|
kthread_init(dummy)
|
|
void *dummy;
|
|
{
|
|
/* Create process 1 (init(8)). */
|
|
start_init(curproc);
|
|
|
|
prepare_usermode();
|
|
|
|
/*
|
|
* This returns to the fork trampoline, then to user mode.
|
|
*/
|
|
return;
|
|
}
|
|
|
|
|
|
/*
|
|
* List of paths to try when searching for "init".
|
|
*/
|
|
static char *initpaths[] = {
|
|
"/sbin/init",
|
|
"/sbin/oinit",
|
|
"/sbin/init.bak",
|
|
"/stand/sysinstall",
|
|
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(p)
|
|
struct proc *p;
|
|
{
|
|
vm_offset_t addr;
|
|
struct execve_args args;
|
|
int options, i, error;
|
|
char **pathp, *path, *ucp, **uap, *arg0, *arg1;
|
|
|
|
initproc = p;
|
|
|
|
/*
|
|
* Need just enough stack to hold the faked-up "execve()" arguments.
|
|
*/
|
|
addr = trunc_page(VM_MAXUSER_ADDRESS - PAGE_SIZE);
|
|
if (vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &addr, PAGE_SIZE, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0) != 0)
|
|
panic("init: couldn't allocate argument space");
|
|
p->p_vmspace->vm_maxsaddr = (caddr_t)addr;
|
|
p->p_vmspace->vm_ssize = 1;
|
|
|
|
for (pathp = &initpaths[0]; (path = *pathp) != NULL; pathp++) {
|
|
/*
|
|
* Move out the boot flag argument.
|
|
*/
|
|
options = 0;
|
|
ucp = (char *)USRSTACK;
|
|
(void)subyte(--ucp, 0); /* trailing zero */
|
|
if (boothowto & RB_SINGLE) {
|
|
(void)subyte(--ucp, 's');
|
|
options = 1;
|
|
}
|
|
#ifdef notyet
|
|
if (boothowto & RB_FASTBOOT) {
|
|
(void)subyte(--ucp, 'f');
|
|
options = 1;
|
|
}
|
|
#endif
|
|
|
|
#ifdef BOOTCDROM
|
|
(void)subyte(--ucp, 'C');
|
|
options = 1;
|
|
#endif
|
|
|
|
#if defined(DEVFS) && defined(DEVFS_ROOT)
|
|
(void)subyte(--ucp, 'd');
|
|
options = 1;
|
|
#endif
|
|
if (options == 0)
|
|
(void)subyte(--ucp, '-');
|
|
(void)subyte(--ucp, '-'); /* leading hyphen */
|
|
arg1 = ucp;
|
|
|
|
/*
|
|
* Move out the file name (also arg 0).
|
|
*/
|
|
for (i = strlen(path) + 1; i >= 0; i--)
|
|
(void)subyte(--ucp, path[i]);
|
|
arg0 = ucp;
|
|
|
|
/*
|
|
* Move out the arg pointers.
|
|
*/
|
|
uap = (char **)((int)ucp & ~(NBPW-1));
|
|
(void)suword((caddr_t)--uap, 0); /* terminator */
|
|
(void)suword((caddr_t)--uap, (int)arg1);
|
|
(void)suword((caddr_t)--uap, (int)arg0);
|
|
|
|
/*
|
|
* Point at the arguments.
|
|
*/
|
|
args.fname = arg0;
|
|
args.argv = uap;
|
|
args.envv = NULL;
|
|
|
|
/*
|
|
* Now try to exec the program. If can't for any reason
|
|
* other than it doesn't exist, complain.
|
|
*
|
|
* Otherwise return to main() which returns to btext
|
|
* which completes the system startup.
|
|
*/
|
|
if ((error = execve(p, &args)) == 0)
|
|
return;
|
|
if (error != ENOENT)
|
|
printf("exec %s: error %d\n", path, error);
|
|
}
|
|
printf("init: not found\n");
|
|
panic("no init");
|
|
}
|