NetBSD/sys/kern/init_main.c

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/* $NetBSD: init_main.c,v 1.151 1999/05/13 21:58:37 thorpej Exp $ */
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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
* The Regents of the University of California. All rights reserved.
* (c) UNIX System Laboratories, Inc.
* All or some portions of this file are derived from material licensed
* to the University of California by American Telephone and Telegraph
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
* the permission of UNIX System Laboratories, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
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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"
#include "rnd.h"
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#include <sys/param.h>
#include <sys/filedesc.h>
#include <sys/file.h>
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#include <sys/errno.h>
#include <sys/exec.h>
#include <sys/kernel.h>
#include <sys/mount.h>
#include <sys/map.h>
#include <sys/proc.h>
#include <sys/kthread.h>
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#include <sys/resourcevar.h>
#include <sys/signalvar.h>
#include <sys/systm.h>
#include <sys/vnode.h>
#include <sys/tty.h>
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#include <sys/conf.h>
#include <sys/disklabel.h>
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#include <sys/buf.h>
#include <sys/device.h>
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#include <sys/socketvar.h>
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#include <sys/protosw.h>
#include <sys/reboot.h>
#include <sys/user.h>
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#ifdef SYSVSHM
#include <sys/shm.h>
#endif
#ifdef SYSVSEM
#include <sys/sem.h>
#endif
#ifdef SYSVMSG
#include <sys/msg.h>
#endif
#include <sys/domain.h>
#include <sys/mbuf.h>
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#include <sys/namei.h>
#if NRND > 0
#include <sys/rnd.h>
#endif
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#include <sys/syscall.h>
#include <sys/syscallargs.h>
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#include <ufs/ufs/quota.h>
#include <machine/cpu.h>
#include <vm/vm.h>
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#include <vm/vm_pageout.h>
#include <uvm/uvm.h>
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#include <net/if.h>
#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.
Copyright (c) 1982, 1986, 1989, 1991, 1993
The Regents of the University of California. All rights reserved.
";
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/* Components of the first process -- never freed. */
struct session session0;
struct pgrp pgrp0;
struct proc proc0;
struct pcred cred0;
struct filedesc0 filedesc0;
struct cwdinfo cwdi0;
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struct plimit limit0;
struct vmspace vmspace0;
struct sigacts sigacts0;
#ifndef curproc
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struct proc *curproc = &proc0;
#endif
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struct proc *initproc;
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int cmask = CMASK;
extern struct user *proc0paddr;
struct vnode *rootvp, *swapdev_vp;
int boothowto;
struct timeval boottime;
struct timeval runtime;
static void check_console __P((struct proc *p));
static void start_init __P((void *));
static void start_pagedaemon __P((void *));
static void start_reaper __P((void *));
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void main __P((void));
extern char sigcode[], esigcode[];
#ifdef SYSCALL_DEBUG
extern char *syscallnames[];
#endif
struct emul emul_netbsd = {
"netbsd",
NULL,
sendsig,
SYS_syscall,
SYS_MAXSYSCALL,
sysent,
#ifdef SYSCALL_DEBUG
syscallnames,
#else
NULL,
#endif
0,
copyargs,
setregs,
sigcode,
esigcode,
};
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/*
* System startup; initialize the world, create process 0, mount root
* filesystem, and fork to create init and pagedaemon. Most of the
* hard work is done in the lower-level initialization routines including
* startup(), which does memory initialization and autoconfiguration.
*/
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void
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main()
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{
struct proc *p;
struct pdevinit *pdev;
int i, s, error;
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extern struct pdevinit pdevinit[];
extern void roundrobin __P((void *));
extern void schedcpu __P((void *));
extern void disk_init __P((void));
#if defined(NFSSERVER) || defined(NFS)
extern void nfs_init __P((void));
#endif
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/*
* Initialize the current process pointer (curproc) before
* any possible traps/probes to simplify trap processing.
*/
p = &proc0;
curproc = p;
/*
* Attempt to find console and initialize
* in case of early panic or other messages.
*/
consinit();
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printf("%s", copyright);
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uvm_init();
/* Do machine-dependent initialization. */
cpu_startup();
/*
* Initialize mbuf's. Do this now because we might attempt to
* allocate mbufs or mbuf clusters during autoconfiguration.
*/
mbinit();
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/* Initialize sockets. */
soinit();
disk_init(); /* must come before autoconfiguration */
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tty_init(); /* initialise tty list */
#if NRND > 0
rnd_init();
#endif
config_init(); /* init autoconfiguration data structures */
configure(); /* ...and configure the hardware */
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/*
* Initialize process and pgrp structures.
*/
procinit();
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/*
* Create process 0 (the swapper).
*/
LIST_INSERT_HEAD(&allproc, p, p_list);
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p->p_pgrp = &pgrp0;
LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash);
LIST_INIT(&pgrp0.pg_members);
LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist);
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pgrp0.pg_session = &session0;
session0.s_count = 1;
session0.s_sid = p->p_pid;
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session0.s_leader = p;
/*
* Set P_NOCLDWAIT so that kernel threads are reparented to
* init(8) when they exit. init(8) can easily wait them out
* for us.
*/
p->p_flag = P_INMEM | P_SYSTEM | P_NOCLDWAIT;
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p->p_stat = SRUN;
p->p_nice = NZERO;
p->p_emul = &emul_netbsd;
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strncpy(p->p_comm, "swapper", MAXCOMLEN);
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/* Create credentials. */
cred0.p_refcnt = 1;
p->p_cred = &cred0;
p->p_ucred = crget();
p->p_ucred->cr_ngroups = 1; /* group 0 */
/* Create the file descriptor table. */
finit();
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p->p_fd = &filedesc0.fd_fd;
fdinit1(&filedesc0);
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/* Create the CWD info. */
p->p_cwdi = &cwdi0;
cwdi0.cwdi_cmask = cmask;
cwdi0.cwdi_refcnt = 1;
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/* Create the limits structures. */
p->p_limit = &limit0;
for (i = 0; i < sizeof(p->p_rlimit)/sizeof(p->p_rlimit[0]); i++)
limit0.pl_rlimit[i].rlim_cur =
limit0.pl_rlimit[i].rlim_max = RLIM_INFINITY;
limit0.pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles;
limit0.pl_rlimit[RLIMIT_NOFILE].rlim_cur =
maxfiles < NOFILE ? maxfiles : NOFILE;
limit0.pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc;
limit0.pl_rlimit[RLIMIT_NPROC].rlim_cur =
maxproc < MAXUPRC ? maxproc : MAXUPRC;
i = ptoa(uvmexp.free);
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limit0.pl_rlimit[RLIMIT_RSS].rlim_max = i;
limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_max = i;
limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = i / 3;
limit0.p_refcnt = 1;
/*
* Initialize proc0's vmspace, which uses the kernel pmap.
* All kernel processes (which never have user space mappings)
* share proc0's vmspace, and thus, the kernel pmap.
*/
uvmspace_init(&vmspace0, pmap_kernel(), round_page(VM_MIN_ADDRESS),
trunc_page(VM_MAX_ADDRESS), TRUE);
p->p_vmspace = &vmspace0;
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p->p_addr = proc0paddr; /* XXX */
/*
* We continue to place resource usage info in the
* user struct so they're pageable.
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*/
p->p_stats = &p->p_addr->u_stats;
/*
* Charge root for one process.
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*/
(void)chgproccnt(0, 1);
rqinit();
/* Configure virtual memory system, set vm rlimits. */
uvm_init_limits(p);
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/* Initialize the file systems. */
#if defined(NFSSERVER) || defined(NFS)
nfs_init(); /* initialize server/shared data */
#endif
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vfsinit();
/* Start real time and statistics clocks. */
initclocks();
#ifdef SYSVSHM
/* Initialize System V style shared memory. */
shminit();
#endif
#ifdef SYSVSEM
/* Initialize System V style semaphores. */
seminit();
#endif
#ifdef SYSVMSG
/* Initialize System V style message queues. */
msginit();
#endif
/* Attach pseudo-devices. */
for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++)
(*pdev->pdev_attach)(pdev->pdev_count);
/*
* Initialize protocols. Block reception of incoming packets
* until everything is ready.
*/
s = splimp();
ifinit();
domaininit();
splx(s);
#ifdef GPROF
/* Initialize kernel profiling. */
kmstartup();
#endif
/* Kick off timeout driven events by calling first time. */
roundrobin(NULL);
schedcpu(NULL);
/* Determine the root and dump devices. */
cpu_rootconf();
cpu_dumpconf();
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/* Mount the root file system. */
do {
domountroothook();
if ((error = vfs_mountroot())) {
printf("cannot mount root, error = %d\n", error);
boothowto |= RB_ASKNAME;
setroot(root_device,
(rootdev != NODEV) ? DISKPART(rootdev) : 0, NULL);
}
} while (error != 0);
mountroothook_destroy();
mountlist.cqh_first->mnt_flag |= MNT_ROOTFS;
mountlist.cqh_first->mnt_op->vfs_refcount++;
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/*
* Get the vnode for '/'. Set filedesc0.fd_fd.fd_cdir to
* reference it.
*/
if (VFS_ROOT(mountlist.cqh_first, &rootvnode))
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panic("cannot find root vnode");
cwdi0.cwdi_cdir = rootvnode;
VREF(cwdi0.cwdi_cdir);
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VOP_UNLOCK(rootvnode, 0);
cwdi0.cwdi_rdir = NULL;
uvm_swap_init();
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/*
* 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.
*/
p->p_stats->p_start = runtime = mono_time = boottime = time;
p->p_rtime.tv_sec = p->p_rtime.tv_usec = 0;
/*
* Initialize signal-related data structures, and signal state
* for proc0.
*/
signal_init();
p->p_sigacts = &sigacts0;
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siginit(p);
/* Create process 1 (init(8)). */
if (fork1(p, 0, SIGCHLD, NULL, 0, NULL, &initproc))
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panic("fork init");
cpu_set_kpc(initproc, start_init, initproc);
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/* Create process 2, the pageout daemon kernel thread. */
if (kthread_create(start_pagedaemon, NULL, NULL, "pagedaemon"))
panic("fork pagedaemon");
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/* Create process 3, the process reaper kernel thread. */
if (kthread_create(start_reaper, NULL, NULL, "reaper"))
panic("fork reaper");
/* Create any other deferred kernel threads. */
kthread_run_deferred_queue();
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/* The scheduler is an infinite loop. */
uvm_scheduler();
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/* NOTREACHED */
}
static void
check_console(p)
struct proc *p;
{
struct nameidata nd;
int error;
NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "/dev/console", p);
error = namei(&nd);
if (error == 0)
vrele(nd.ni_vp);
else if (error == ENOENT)
printf("warning: no /dev/console\n");
else
printf("warning: lookup /dev/console: error %d\n", error);
}
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/*
* List of paths to try when searching for "init".
*/
static char *initpaths[] = {
"/sbin/init",
"/sbin/oinit",
"/sbin/init.bak",
NULL,
};
/*
* Start the initial user process; try exec'ing each pathname in "initpaths".
* The program is invoked with one argument containing the boot flags.
*/
static void
start_init(arg)
void *arg;
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{
struct proc *p = arg;
vaddr_t addr;
struct sys_execve_args /* {
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syscallarg(const char *) path;
syscallarg(char * const *) argp;
syscallarg(char * const *) envp;
} */ args;
int options, i, error;
register_t retval[2];
char flags[4], *flagsp;
char **pathp, *path, *slash, *ucp, **uap, *arg0, *arg1 = NULL;
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/*
* Now in process 1.
*/
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strncpy(p->p_comm, "init", MAXCOMLEN);
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/*
* This is not the right way to do this. We really should
* hand-craft a descriptor onto /dev/console to hand to init,
* but that's a _lot_ more work, and the benefit from this easy
* hack makes up for the "good is the enemy of the best" effect.
*/
check_console(p);
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/*
* Need just enough stack to hold the faked-up "execve()" arguments.
*/
addr = USRSTACK - PAGE_SIZE;
if (uvm_map(&p->p_vmspace->vm_map, &addr, PAGE_SIZE,
NULL, UVM_UNKNOWN_OFFSET,
UVM_MAPFLAG(UVM_PROT_ALL, UVM_PROT_ALL, UVM_INH_COPY,
UVM_ADV_NORMAL,
UVM_FLAG_FIXED|UVM_FLAG_OVERLAY|UVM_FLAG_COPYONW))
!= KERN_SUCCESS)
panic("init: couldn't allocate argument space");
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p->p_vmspace->vm_maxsaddr = (caddr_t)addr;
for (pathp = &initpaths[0]; (path = *pathp) != NULL; pathp++) {
ucp = (char *)(addr + PAGE_SIZE);
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/*
* Construct the boot flag argument.
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*/
flagsp = flags;
*flagsp++ = '-';
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options = 0;
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if (boothowto & RB_SINGLE) {
*flagsp++ = 's';
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options = 1;
}
#ifdef notyet
if (boothowto & RB_FASTBOOT) {
*flagsp++ = 'f';
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options = 1;
}
#endif
/*
* Move out the flags (arg 1), if necessary.
*/
if (options != 0) {
*flagsp++ = '\0';
i = flagsp - flags;
#ifdef DEBUG
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printf("init: copying out flags `%s' %d\n", flags, i);
#endif
(void)copyout((caddr_t)flags, (caddr_t)(ucp -= i), i);
arg1 = ucp;
}
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/*
* Move out the file name (also arg 0).
*/
i = strlen(path) + 1;
#ifdef DEBUG
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printf("init: copying out path `%s' %d\n", path, i);
#endif
(void)copyout((caddr_t)path, (caddr_t)(ucp -= i), i);
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arg0 = ucp;
/*
* Move out the arg pointers.
*/
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uap = (char **)((long)ucp & ~ALIGNBYTES);
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(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);
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/*
* Point at the arguments.
*/
SCARG(&args, path) = arg0;
SCARG(&args, argp) = uap;
SCARG(&args, envp) = NULL;
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/*
* 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)
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return;
if (error != ENOENT)
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printf("exec %s: error %d\n", path, error);
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}
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printf("init: not found\n");
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panic("no init");
}
/* ARGSUSED */
static void
start_pagedaemon(arg)
void *arg;
{
uvm_pageout();
/* NOTREACHED */
}
/* ARGSUSED */
static void
start_reaper(arg)
void *arg;
{
reaper();
/* NOTREACHED */
}