2 * Copyright (c) 1995 Terrence R. Lambert
5 * Copyright (c) 1982, 1986, 1989, 1991, 1992, 1993
6 * The Regents of the University of California. All rights reserved.
7 * (c) UNIX System Laboratories, Inc.
8 * All or some portions of this file are derived from material licensed
9 * to the University of California by American Telephone and Telegraph
10 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
11 * the permission of UNIX System Laboratories, Inc.
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. All advertising materials mentioning features or use of this software
22 * must display the following acknowledgement:
23 * This product includes software developed by the University of
24 * California, Berkeley and its contributors.
25 * 4. Neither the name of the University nor the names of its contributors
26 * may be used to endorse or promote products derived from this software
27 * without specific prior written permission.
29 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
30 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
31 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
32 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
33 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
34 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
35 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
37 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
38 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
41 * @(#)init_main.c 8.9 (Berkeley) 1/21/94
42 * $FreeBSD: src/sys/kern/init_main.c,v 1.134.2.8 2003/06/06 20:21:32 tegge Exp $
43 * $DragonFly: src/sys/kern/init_main.c,v 1.40 2004/10/12 19:20:46 dillon Exp $
46 #include "opt_init_path.h"
48 #include <sys/param.h>
50 #include <sys/filedesc.h>
51 #include <sys/kernel.h>
52 #include <sys/mount.h>
53 #include <sys/sysctl.h>
55 #include <sys/resourcevar.h>
56 #include <sys/signalvar.h>
57 #include <sys/systm.h>
58 #include <sys/vnode.h>
59 #include <sys/sysent.h>
60 #include <sys/reboot.h>
61 #include <sys/sysproto.h>
62 #include <sys/vmmeter.h>
63 #include <sys/unistd.h>
64 #include <sys/malloc.h>
65 #include <sys/file2.h>
66 #include <sys/thread2.h>
68 #include <machine/cpu.h>
71 #include <vm/vm_param.h>
74 #include <vm/vm_map.h>
76 #include <sys/copyright.h>
78 void mi_startup(void); /* Should be elsewhere */
80 /* Components of the first process -- never freed. */
81 static struct session session0
;
82 static struct pgrp pgrp0
;
83 static struct procsig procsig0
;
84 static struct filedesc0 filedesc0
;
85 static struct plimit limit0
;
86 static struct vmspace vmspace0
;
87 struct proc
*initproc
;
89 struct thread thread0
;
92 extern struct user
*proc0paddr
;
93 extern int fallback_elf_brand
;
95 int boothowto
= 0; /* initialized so that it can be patched */
96 SYSCTL_INT(_debug
, OID_AUTO
, boothowto
, CTLFLAG_RD
, &boothowto
, 0, "");
99 * This ensures that there is at least one entry so that the sysinit_set
100 * symbol is not undefined. A sybsystem ID of SI_SUB_DUMMY is never
103 SYSINIT(placeholder
, SI_SUB_DUMMY
, SI_ORDER_ANY
, NULL
, NULL
)
106 * The sysinit table itself. Items are checked off as the are run.
107 * If we want to register new sysinit types, add them to newsysinit.
109 SET_DECLARE(sysinit_set
, struct sysinit
);
110 struct sysinit
**sysinit
, **sysinit_end
;
111 struct sysinit
**newsysinit
, **newsysinit_end
;
115 * Merge a new sysinit set into the current set, reallocating it if
116 * necessary. This can only be called after malloc is running.
119 sysinit_add(struct sysinit
**set
, struct sysinit
**set_end
)
121 struct sysinit
**newset
;
122 struct sysinit
**sipp
;
123 struct sysinit
**xipp
;
126 count
= set_end
- set
;
128 count
+= newsysinit_end
- newsysinit
;
130 count
+= sysinit_end
- sysinit
;
131 newset
= malloc(count
* sizeof(*sipp
), M_TEMP
, M_WAITOK
);
133 panic("cannot malloc for sysinit");
136 for (sipp
= newsysinit
; sipp
< newsysinit_end
; sipp
++)
139 for (sipp
= sysinit
; sipp
< sysinit_end
; sipp
++)
142 for (sipp
= set
; sipp
< set_end
; sipp
++)
145 free(newsysinit
, M_TEMP
);
147 newsysinit_end
= newset
+ count
;
151 * System startup; initialize the world, create process 0, mount root
152 * filesystem, and fork to create init and pagedaemon. Most of the
153 * hard work is done in the lower-level initialization routines including
154 * startup(), which does memory initialization and autoconfiguration.
156 * This allows simple addition of new kernel subsystems that require
157 * boot time initialization. It also allows substitution of subsystem
158 * (for instance, a scheduler, kernel profiler, or VM system) by object
159 * module. Finally, it allows for optional "kernel threads".
164 struct sysinit
*sip
; /* system initialization*/
165 struct sysinit
**sipp
; /* system initialization*/
166 struct sysinit
**xipp
; /* interior loop of sort*/
167 struct sysinit
*save
; /* bubble*/
169 if (sysinit
== NULL
) {
170 sysinit
= SET_BEGIN(sysinit_set
);
171 sysinit_end
= SET_LIMIT(sysinit_set
);
176 * Perform a bubble sort of the system initialization objects by
177 * their subsystem (primary key) and order (secondary key).
179 for (sipp
= sysinit
; sipp
< sysinit_end
; sipp
++) {
180 for (xipp
= sipp
+ 1; xipp
< sysinit_end
; xipp
++) {
181 if ((*sipp
)->subsystem
< (*xipp
)->subsystem
||
182 ((*sipp
)->subsystem
== (*xipp
)->subsystem
&&
183 (*sipp
)->order
<= (*xipp
)->order
))
192 * Traverse the (now) ordered list of system initialization tasks.
193 * Perform each task, and continue on to the next task.
195 * The last item on the list is expected to be the scheduler,
196 * which will not return.
198 for (sipp
= sysinit
; sipp
< sysinit_end
; sipp
++) {
200 if (sip
->subsystem
== SI_SUB_DUMMY
)
201 continue; /* skip dummy task(s)*/
203 if (sip
->subsystem
== SI_SUB_DONE
)
207 (*(sip
->func
))(sip
->udata
);
209 /* Check off the one we're just done */
210 sip
->subsystem
= SI_SUB_DONE
;
212 /* Check if we've installed more sysinit items via KLD */
213 if (newsysinit
!= NULL
) {
214 if (sysinit
!= SET_BEGIN(sysinit_set
))
215 free(sysinit
, M_TEMP
);
216 sysinit
= newsysinit
;
217 sysinit_end
= newsysinit_end
;
219 newsysinit_end
= NULL
;
224 panic("Shouldn't get here!");
230 ***************************************************************************
232 **** The following SYSINIT's belong elsewhere, but have not yet
235 ***************************************************************************
238 print_caddr_t(void *data __unused
)
240 printf("%s", (char *)data
);
242 SYSINIT(announce
, SI_SUB_COPYRIGHT
, SI_ORDER_FIRST
, print_caddr_t
, copyright
)
245 * Leave the critical section that protected us from spurious interrupts
246 * so device probes work.
249 leavecrit(void *dummy __unused
)
252 KKASSERT(!IN_CRITICAL_SECT(curthread
));
254 printf("Leaving critical section, allowing interrupts\n");
256 SYSINIT(leavecrit
, SI_SUB_LEAVE_CRIT
, SI_ORDER_ANY
, leavecrit
, NULL
)
259 ***************************************************************************
261 **** The two following SYSINT's are proc0 specific glue code. I am not
262 **** convinced that they can not be safely combined, but their order of
263 **** operation has been maintained as the same as the original init_main.c
266 **** These probably belong in init_proc.c or kern_proc.c, since they
267 **** deal with proc0 (the fork template process).
269 ***************************************************************************
273 proc0_init(void *dummy __unused
)
276 struct filedesc0
*fdp
;
282 * Initialize process and pgrp structures.
287 * Initialize sleep queue hash table
292 * additional VM structures
297 * Create process 0 (the swapper).
299 LIST_INSERT_HEAD(&allproc
, p
, p_list
);
301 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0
, pg_hash
);
302 LIST_INIT(&pgrp0
.pg_members
);
303 LIST_INSERT_HEAD(&pgrp0
.pg_members
, p
, p_pglist
);
305 pgrp0
.pg_session
= &session0
;
306 session0
.s_count
= 1;
307 session0
.s_leader
= p
;
309 p
->p_sysent
= &aout_sysvec
;
310 TAILQ_INIT(&p
->p_sysmsgq
);
312 p
->p_flag
= P_INMEM
| P_SYSTEM
;
315 p
->p_rtprio
.type
= RTP_PRIO_NORMAL
;
316 p
->p_rtprio
.prio
= 0;
321 bcopy("swapper", p
->p_comm
, sizeof ("swapper"));
323 /* Create credentials. */
324 p
->p_ucred
= crget();
325 p
->p_ucred
->cr_ruidinfo
= uifind(0);
326 p
->p_ucred
->cr_ngroups
= 1; /* group 0 */
327 p
->p_ucred
->cr_uidinfo
= uifind(0);
330 p
->p_ucred
->cr_prison
= NULL
;
332 /* Create procsig. */
333 p
->p_procsig
= &procsig0
;
334 p
->p_procsig
->ps_refcnt
= 1;
336 /* Initialize signal state for process 0. */
339 /* Create the file descriptor table. */
341 p
->p_fd
= &fdp
->fd_fd
;
343 fdp
->fd_fd
.fd_refcnt
= 1;
344 fdp
->fd_fd
.fd_cmask
= cmask
;
345 fdp
->fd_fd
.fd_ofiles
= fdp
->fd_dfiles
;
346 fdp
->fd_fd
.fd_ofileflags
= fdp
->fd_dfileflags
;
347 fdp
->fd_fd
.fd_nfiles
= NDFILE
;
349 /* Create the limits structures. */
350 p
->p_limit
= &limit0
;
351 for (i
= 0; i
< sizeof(p
->p_rlimit
)/sizeof(p
->p_rlimit
[0]); i
++)
352 limit0
.pl_rlimit
[i
].rlim_cur
=
353 limit0
.pl_rlimit
[i
].rlim_max
= RLIM_INFINITY
;
354 limit0
.pl_rlimit
[RLIMIT_NOFILE
].rlim_cur
=
355 limit0
.pl_rlimit
[RLIMIT_NOFILE
].rlim_max
= maxfiles
;
356 limit0
.pl_rlimit
[RLIMIT_NPROC
].rlim_cur
=
357 limit0
.pl_rlimit
[RLIMIT_NPROC
].rlim_max
= maxproc
;
358 i
= ptoa(vmstats
.v_free_count
);
359 limit0
.pl_rlimit
[RLIMIT_RSS
].rlim_max
= i
;
360 limit0
.pl_rlimit
[RLIMIT_MEMLOCK
].rlim_max
= i
;
361 limit0
.pl_rlimit
[RLIMIT_MEMLOCK
].rlim_cur
= i
/ 3;
362 limit0
.p_cpulimit
= RLIM_INFINITY
;
365 /* Allocate a prototype map so we have something to fork. */
366 pmap_pinit0(vmspace_pmap(&vmspace0
));
367 p
->p_vmspace
= &vmspace0
;
368 vmspace0
.vm_refcnt
= 1;
369 vm_map_init(&vmspace0
.vm_map
, round_page(VM_MIN_ADDRESS
),
370 trunc_page(VM_MAXUSER_ADDRESS
));
371 vmspace0
.vm_map
.pmap
= vmspace_pmap(&vmspace0
);
374 * We continue to place resource usage info and signal
375 * actions in the user struct so they're pageable.
377 p
->p_stats
= &p
->p_addr
->u_stats
;
378 p
->p_sigacts
= &p
->p_addr
->u_sigacts
;
381 * Charge root for one process.
383 (void)chgproccnt(p
->p_ucred
->cr_uidinfo
, 1, 0);
386 SYSINIT(p0init
, SI_SUB_INTRINSIC
, SI_ORDER_FIRST
, proc0_init
, NULL
)
390 proc0_post(void *dummy __unused
)
396 * Now we can look at the time, having had a chance to verify the
397 * time from the file system. Pretend that proc0 started now.
399 FOREACH_PROC_IN_SYSTEM(p
) {
400 microtime(&p
->p_thread
->td_start
);
404 * Give the ``random'' number generator a thump.
405 * XXX: Does read_random() contain enough bits to be used here ?
408 srandom(ts
.tv_sec
^ ts
.tv_nsec
);
410 SYSINIT(p0post
, SI_SUB_INTRINSIC_POST
, SI_ORDER_FIRST
, proc0_post
, NULL
)
413 ***************************************************************************
415 **** The following SYSINIT's and glue code should be moved to the
416 **** respective files on a per subsystem basis.
418 ***************************************************************************
423 ***************************************************************************
425 **** The following code probably belongs in another file, like
426 **** kern/init_init.c.
428 ***************************************************************************
432 * List of paths to try when searching for "init".
434 static char init_path
[MAXPATHLEN
] =
436 __XSTRING(INIT_PATH
);
438 "/sbin/init:/sbin/oinit:/sbin/init.bak:/stand/sysinstall";
440 SYSCTL_STRING(_kern
, OID_AUTO
, init_path
, CTLFLAG_RD
, init_path
, 0, "");
443 * Start the initial user process; try exec'ing each pathname in init_path.
444 * The program is invoked with one argument containing the boot flags.
446 * The MP lock is held on entry.
449 start_init(void *dummy
)
452 struct execve_args args
;
454 char *var
, *path
, *next
, *s
;
455 char *ucp
, **uap
, *arg0
, *arg1
;
462 /* Get the vnode for '/'. Set p->p_fd->fd_cdir to reference it. */
463 mp
= TAILQ_FIRST(&mountlist
);
464 if (VFS_ROOT(mp
, &vp
))
465 panic("cannot find root vnode");
466 if (mp
->mnt_ncp
== NULL
) {
467 mp
->mnt_ncp
= cache_allocroot(mp
, vp
);
468 cache_unlock(mp
->mnt_ncp
); /* leave ref intact */
470 p
->p_fd
->fd_cdir
= vp
;
471 vref(p
->p_fd
->fd_cdir
);
472 p
->p_fd
->fd_rdir
= vp
;
473 vref(p
->p_fd
->fd_rdir
);
474 vfs_cache_setroot(vp
, cache_hold(mp
->mnt_ncp
));
475 VOP_UNLOCK(vp
, 0, curthread
); /* leave ref intact */
476 p
->p_fd
->fd_ncdir
= cache_hold(mp
->mnt_ncp
);
477 p
->p_fd
->fd_nrdir
= cache_hold(mp
->mnt_ncp
);
480 * Need just enough stack to hold the faked-up "execve()" arguments.
482 addr
= trunc_page(USRSTACK
- PAGE_SIZE
);
483 if (vm_map_find(&p
->p_vmspace
->vm_map
, NULL
, 0, &addr
, PAGE_SIZE
,
484 FALSE
, VM_PROT_ALL
, VM_PROT_ALL
, 0) != 0)
485 panic("init: couldn't allocate argument space");
486 p
->p_vmspace
->vm_maxsaddr
= (caddr_t
)addr
;
487 p
->p_vmspace
->vm_ssize
= 1;
489 if ((var
= getenv("init_path")) != NULL
) {
490 strncpy(init_path
, var
, sizeof init_path
);
491 init_path
[sizeof init_path
- 1] = 0;
493 if ((var
= getenv("kern.fallback_elf_brand")) != NULL
)
494 fallback_elf_brand
= strtol(var
, NULL
, 0);
496 for (path
= init_path
; *path
!= '\0'; path
= next
) {
501 for (next
= path
; *next
!= '\0' && *next
!= ':'; next
++)
504 printf("start_init: trying %.*s\n", (int)(next
- path
),
508 * Move out the boot flag argument.
511 ucp
= (char *)USRSTACK
;
512 (void)subyte(--ucp
, 0); /* trailing zero */
513 if (boothowto
& RB_SINGLE
) {
514 (void)subyte(--ucp
, 's');
518 if (boothowto
& RB_FASTBOOT
) {
519 (void)subyte(--ucp
, 'f');
525 (void)subyte(--ucp
, 'C');
529 (void)subyte(--ucp
, '-');
530 (void)subyte(--ucp
, '-'); /* leading hyphen */
534 * Move out the file name (also arg 0).
536 (void)subyte(--ucp
, 0);
537 for (s
= next
- 1; s
>= path
; s
--)
538 (void)subyte(--ucp
, *s
);
542 * Move out the arg pointers.
544 uap
= (char **)((intptr_t)ucp
& ~(sizeof(intptr_t)-1));
545 (void)suword((caddr_t
)--uap
, (long)0); /* terminator */
546 (void)suword((caddr_t
)--uap
, (long)(intptr_t)arg1
);
547 (void)suword((caddr_t
)--uap
, (long)(intptr_t)arg0
);
550 * Point at the arguments.
557 * Now try to exec the program. If can't for any reason
558 * other than it doesn't exist, complain.
560 * Otherwise, return via fork_trampoline() all the way
561 * to user mode as init!
563 * WARNING! We may have been moved to another cpu after
564 * acquiring the current user process designation. The
565 * MP lock will migrate with us though so we still have to
568 if ((error
= execve(&args
)) == 0) {
569 if (p
->p_thread
->td_gd
->gd_uschedcp
!= p
)
575 printf("exec %.*s: error %d\n", (int)(next
- path
),
578 printf("init: not found in path %s\n", init_path
);
583 * Like kthread_create(), but runs in it's own address space.
584 * We do this early to reserve pid 1.
586 * Note special case - do not make it runnable yet. Other work
587 * in progress will change this more.
590 create_init(const void *udata __unused
)
596 error
= fork1(&proc0
, RFFDG
| RFPROC
, &initproc
);
598 panic("cannot fork init: %d", error
);
599 initproc
->p_flag
|= P_INMEM
| P_SYSTEM
;
600 cpu_set_fork_handler(initproc
, start_init
, NULL
);
603 SYSINIT(init
,SI_SUB_CREATE_INIT
, SI_ORDER_FIRST
, create_init
, NULL
)
606 * Make it runnable now.
609 kick_init(const void *udata __unused
)
611 start_forked_proc(&proc0
, initproc
);
613 SYSINIT(kickinit
,SI_SUB_KTHREAD_INIT
, SI_ORDER_FIRST
, kick_init
, NULL
)
616 * Machine independant globaldata initialization
618 * WARNING! Called from early boot, 'mycpu' may not work yet.
621 mi_gdinit(struct globaldata
*gd
, int cpuid
)
623 TAILQ_INIT(&gd
->gd_tdfreeq
); /* for pmap_{new,dispose}_thread() */
624 TAILQ_INIT(&gd
->gd_systimerq
);
625 gd
->gd_cpuid
= cpuid
;
626 gd
->gd_cpumask
= (cpumask_t
)1 << cpuid
;
628 vm_map_entry_reserve_cpu_init(gd
);