NetBSD/sys/kern/init_main.c

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/* $NetBSD: init_main.c,v 1.98 1997/03/26 22:38:45 gwr 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.
*
* @(#)init_main.c 8.9 (Berkeley) 1/21/94
*/
#include <sys/param.h>
#include <sys/filedesc.h>
#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/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>
#ifdef REAL_CLISTS
#include <sys/clist.h>
#endif
#include <sys/device.h>
#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>
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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 <net/if.h>
#include <net/raw_cb.h>
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char copyright[] =
"Copyright (c) 1982, 1986, 1989, 1991, 1993\n The Regents of the University of California. All rights reserved.\n\n";
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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 plimit limit0;
struct vmspace vmspace0;
struct proc *curproc = &proc0;
struct proc *initproc, *pageproc;
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((struct proc *));
static void start_pagedaemon __P((struct proc *));
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void main __P((void *));
#ifdef cpu_set_init_frame
void *initframep; /* XXX should go away */
#endif
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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(framep)
void *framep; /* XXX should go away */
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{
register struct proc *p;
register struct pdevinit *pdev;
register int i;
int s, error;
register_t rval[2];
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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(copyright);
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vm_mem_init();
kmeminit();
disk_init(); /* must come before autoconfiguration */
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tty_init(); /* initialise tty list */
config_init(); /* init autoconfiguration data structures */
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cpu_startup();
/*
* 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_leader = p;
p->p_flag = P_INMEM | P_SYSTEM;
p->p_stat = SRUN;
p->p_nice = NZERO;
p->p_emul = &emul_netbsd;
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bcopy("swapper", p->p_comm, sizeof ("swapper"));
/* 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. */
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p->p_fd = &filedesc0.fd_fd;
filedesc0.fd_fd.fd_refcnt = 1;
filedesc0.fd_fd.fd_cmask = cmask;
filedesc0.fd_fd.fd_ofiles = filedesc0.fd_dfiles;
filedesc0.fd_fd.fd_ofileflags = filedesc0.fd_dfileflags;
filedesc0.fd_fd.fd_nfiles = NDFILE;
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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_cur = NOFILE;
limit0.pl_rlimit[RLIMIT_NPROC].rlim_cur = MAXUPRC;
i = ptoa(cnt.v_free_count);
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;
/* Allocate a prototype map so we have something to fork. */
p->p_vmspace = &vmspace0;
vmspace0.vm_refcnt = 1;
pmap_pinit(&vmspace0.vm_pmap);
vm_map_init(&p->p_vmspace->vm_map, round_page(VM_MIN_ADDRESS),
trunc_page(VM_MAX_ADDRESS), TRUE);
vmspace0.vm_map.pmap = &vmspace0.vm_pmap;
p->p_addr = proc0paddr; /* XXX */
/*
* We continue to place resource usage info and signal
* actions in the user struct so they're pageable.
*/
p->p_stats = &p->p_addr->u_stats;
p->p_sigacts = &p->p_addr->u_sigacts;
/*
* Charge root for one process.
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*/
(void)chgproccnt(0, 1);
rqinit();
/* Configure virtual memory system, set vm rlimits. */
vm_init_limits(p);
/* 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();
/* Initialize mbuf's. */
mbinit();
#ifdef REAL_CLISTS
/* Initialize clists. */
clist_init();
#endif
#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/swap/dump devices, etc. */
cpu_rootconf();
swapconf();
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");
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filedesc0.fd_fd.fd_cdir = rootvnode;
VREF(filedesc0.fd_fd.fd_cdir);
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VOP_UNLOCK(rootvnode);
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filedesc0.fd_fd.fd_rdir = NULL;
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swapinit();
/*
* 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 state for process 0. */
siginit(p);
/* Create process 1 (init(8)). */
if (sys_fork(p, NULL, rval))
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panic("fork init");
#ifdef cpu_set_init_frame /* XXX should go away */
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if (rval[1]) {
/*
* Now in process 1.
*/
initframep = framep;
start_init(curproc);
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return;
}
#else
cpu_set_kpc(pfind(1), start_init);
#endif
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/* Create process 2 (the pageout daemon). */
if (sys_fork(p, NULL, rval))
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panic("fork pager");
#ifdef cpu_set_init_frame /* XXX should go away */
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if (rval[1]) {
/*
* Now in process 2.
*/
start_pagedaemon(curproc);
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}
#else
cpu_set_kpc(pfind(2), start_pagedaemon);
#endif
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/* The scheduler is an infinite loop. */
scheduler();
/* 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(p)
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struct proc *p;
{
vm_offset_t addr;
struct sys_execve_args /* {
syscallarg(char *) path;
syscallarg(char * const *) argp;
syscallarg(char * const *) envp;
} */ args;
int options, i, error;
register_t retval[2];
char flags[4], *flagsp;
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char **pathp, *path, *ucp, **uap, *arg0, *arg1 = NULL;
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/*
* Now in process 1.
*/
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initproc = p;
#ifdef cpu_set_init_frame /* XXX should go away */
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/*
* We need to set the system call frame as if we were entered through
* a syscall() so that when we call sys_execve() below, it will be able
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* to set the entry point (see setregs) when it tries to exec. The
* startup code in "locore.s" has allocated space for the frame and
* passed a pointer to that space as main's argument.
*/
cpu_set_init_frame(p, initframep);
#endif
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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 (vm_allocate(&p->p_vmspace->vm_map, &addr, (vm_size_t)PAGE_SIZE,
FALSE) != 0)
panic("init: couldn't allocate argument space");
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);
(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.
*/
if ((error = sys_execve(p, &args, retval)) == 0)
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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");
}
static void
start_pagedaemon(p)
struct proc *p;
{
/*
* Now in process 2.
*/
pageproc = p;
p->p_flag |= P_INMEM | P_SYSTEM; /* XXX */
bcopy("pagedaemon", curproc->p_comm, sizeof ("pagedaemon"));
vm_pageout();
/* NOTREACHED */
}