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 1.87 2008/06/07 11:37:23 mneumann 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/machintr.h>
67 #include <sys/file2.h>
68 #include <sys/thread2.h>
69 #include <sys/sysref2.h>
70 #include <sys/spinlock2.h>
71 #include <sys/mplock2.h>
73 #include <machine/cpu.h>
76 #include <vm/vm_param.h>
79 #include <vm/vm_map.h>
80 #include <vm/vm_extern.h>
82 #include <sys/copyright.h>
84 int vfs_mountroot_devfs(void);
86 /* Components of the first process -- never freed. */
87 static struct session session0
;
88 static struct pgrp pgrp0
;
89 static struct sigacts sigacts0
;
90 static struct filedesc filedesc0
;
91 static struct plimit limit0
;
92 static struct vmspace vmspace0
;
93 struct proc
*initproc
;
96 struct thread thread0
;
99 extern struct user
*proc0paddr
;
100 extern int fallback_elf_brand
;
102 int boothowto
= 0; /* initialized so that it can be patched */
103 SYSCTL_INT(_debug
, OID_AUTO
, boothowto
, CTLFLAG_RD
, &boothowto
, 0, "");
106 * This ensures that there is at least one entry so that the sysinit_set
107 * symbol is not undefined. A subsystem ID of SI_SPECIAL_DUMMY is never
110 SYSINIT(placeholder
, SI_SPECIAL_DUMMY
, SI_ORDER_ANY
, NULL
, NULL
)
113 * The sysinit table itself. Items are checked off as the are run.
114 * If we want to register new sysinit types, add them to newsysinit.
116 SET_DECLARE(sysinit_set
, struct sysinit
);
117 struct sysinit
**sysinit
, **sysinit_end
;
118 struct sysinit
**newsysinit
, **newsysinit_end
;
122 * Merge a new sysinit set into the current set, reallocating it if
123 * necessary. This can only be called after malloc is running.
126 sysinit_add(struct sysinit
**set
, struct sysinit
**set_end
)
128 struct sysinit
**newset
;
129 struct sysinit
**sipp
;
130 struct sysinit
**xipp
;
133 count
= set_end
- set
;
135 count
+= newsysinit_end
- newsysinit
;
137 count
+= sysinit_end
- sysinit
;
138 newset
= kmalloc(count
* sizeof(*sipp
), M_TEMP
, M_WAITOK
);
141 for (sipp
= newsysinit
; sipp
< newsysinit_end
; sipp
++)
144 for (sipp
= sysinit
; sipp
< sysinit_end
; sipp
++)
147 for (sipp
= set
; sipp
< set_end
; sipp
++)
150 kfree(newsysinit
, M_TEMP
);
152 newsysinit_end
= newset
+ count
;
156 * Callbacks from machine-dependant startup code (e.g. init386) to set
157 * up low level entities related to cpu #0's globaldata.
159 * Called from very low level boot code.
162 mi_proc0init(struct globaldata
*gd
, struct user
*proc0paddr
)
164 lwkt_init_thread(&thread0
, proc0paddr
, LWKT_THREAD_STACK
, 0, gd
);
165 lwkt_set_comm(&thread0
, "thread0");
166 RB_INIT(&proc0
.p_lwp_tree
);
167 spin_init(&proc0
.p_spin
);
168 proc0
.p_lasttid
= 0; /* +1 = next TID */
169 lwp_rb_tree_RB_INSERT(&proc0
.p_lwp_tree
, &lwp0
);
170 lwp0
.lwp_thread
= &thread0
;
171 lwp0
.lwp_proc
= &proc0
;
172 proc0
.p_usched
= usched_init();
173 lwp0
.lwp_cpumask
= 0xFFFFFFFF;
174 varsymset_init(&proc0
.p_varsymset
, NULL
);
175 thread0
.td_flags
|= TDF_RUNNING
;
176 thread0
.td_proc
= &proc0
;
177 thread0
.td_lwp
= &lwp0
;
178 thread0
.td_switch
= cpu_lwkt_switch
;
179 lwkt_schedule_self(curthread
);
183 * System startup; initialize the world, create process 0, mount root
184 * filesystem, and fork to create init and pagedaemon. Most of the
185 * hard work is done in the lower-level initialization routines including
186 * startup(), which does memory initialization and autoconfiguration.
188 * This allows simple addition of new kernel subsystems that require
189 * boot time initialization. It also allows substitution of subsystem
190 * (for instance, a scheduler, kernel profiler, or VM system) by object
191 * module. Finally, it allows for optional "kernel threads".
196 struct sysinit
*sip
; /* system initialization*/
197 struct sysinit
**sipp
; /* system initialization*/
198 struct sysinit
**xipp
; /* interior loop of sort*/
199 struct sysinit
*save
; /* bubble*/
201 if (sysinit
== NULL
) {
202 sysinit
= SET_BEGIN(sysinit_set
);
203 sysinit_end
= SET_LIMIT(sysinit_set
);
208 * Perform a bubble sort of the system initialization objects by
209 * their subsystem (primary key) and order (secondary key).
211 for (sipp
= sysinit
; sipp
< sysinit_end
; sipp
++) {
212 for (xipp
= sipp
+ 1; xipp
< sysinit_end
; xipp
++) {
213 if ((*sipp
)->subsystem
< (*xipp
)->subsystem
||
214 ((*sipp
)->subsystem
== (*xipp
)->subsystem
&&
215 (*sipp
)->order
<= (*xipp
)->order
))
224 * Traverse the (now) ordered list of system initialization tasks.
225 * Perform each task, and continue on to the next task.
227 * The last item on the list is expected to be the scheduler,
228 * which will not return.
230 for (sipp
= sysinit
; sipp
< sysinit_end
; sipp
++) {
232 if (sip
->subsystem
== SI_SPECIAL_DUMMY
)
233 continue; /* skip dummy task(s)*/
235 if (sip
->subsystem
== SI_SPECIAL_DONE
)
239 (*(sip
->func
))(sip
->udata
);
241 /* Check off the one we're just done */
242 sip
->subsystem
= SI_SPECIAL_DONE
;
244 /* Check if we've installed more sysinit items via KLD */
245 if (newsysinit
!= NULL
) {
246 if (sysinit
!= SET_BEGIN(sysinit_set
))
247 kfree(sysinit
, M_TEMP
);
248 sysinit
= newsysinit
;
249 sysinit_end
= newsysinit_end
;
251 newsysinit_end
= NULL
;
256 panic("Shouldn't get here!");
262 ***************************************************************************
264 **** The following SYSINIT's belong elsewhere, but have not yet
267 ***************************************************************************
270 print_caddr_t(void *data __unused
)
272 kprintf("%s", (char *)data
);
274 SYSINIT(announce
, SI_BOOT1_COPYRIGHT
, SI_ORDER_FIRST
, print_caddr_t
, copyright
)
277 * Leave the critical section that protected us from spurious interrupts
278 * so device probes work.
281 leavecrit(void *dummy __unused
)
283 MachIntrABI
.finalize();
285 MachIntrABI
.cleanup();
287 KKASSERT(!IN_CRITICAL_SECT(curthread
));
290 kprintf("Leaving critical section, allowing interrupts\n");
292 SYSINIT(leavecrit
, SI_BOOT2_LEAVE_CRIT
, SI_ORDER_ANY
, leavecrit
, NULL
)
295 * This is called after the threading system is up and running,
296 * including the softclock, clock interrupts, and SMP.
299 tsleepworks(void *dummy __unused
)
301 tsleep_now_works
= 1;
303 SYSINIT(tsleepworks
, SI_BOOT2_FINISH_SMP
, SI_ORDER_SECOND
, tsleepworks
, NULL
)
306 * This is called after devices have configured. Tell the kernel we are
307 * no longer in cold boot.
310 endofcoldboot(void *dummy __unused
)
314 SYSINIT(endofcoldboot
, SI_SUB_ISWARM
, SI_ORDER_ANY
, endofcoldboot
, NULL
)
317 ***************************************************************************
319 **** The two following SYSINT's are proc0 specific glue code. I am not
320 **** convinced that they can not be safely combined, but their order of
321 **** operation has been maintained as the same as the original init_main.c
324 **** These probably belong in init_proc.c or kern_proc.c, since they
325 **** deal with proc0 (the fork template process).
327 ***************************************************************************
331 proc0_init(void *dummy __unused
)
340 * Initialize process and pgrp structures.
345 * additional VM structures
350 * Create process 0 (the swapper).
352 LIST_INSERT_HEAD(&allproc
, p
, p_list
);
354 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0
, pg_hash
);
355 LIST_INIT(&pgrp0
.pg_members
);
356 LIST_INSERT_HEAD(&pgrp0
.pg_members
, p
, p_pglist
);
358 pgrp0
.pg_session
= &session0
;
359 session0
.s_count
= 1;
360 session0
.s_leader
= p
;
362 p
->p_sysent
= &aout_sysvec
;
364 p
->p_flag
= P_SYSTEM
;
366 lp
->lwp_stat
= LSRUN
;
368 p
->p_rtprio
.type
= RTP_PRIO_NORMAL
;
369 p
->p_rtprio
.prio
= 0;
370 lp
->lwp_rtprio
= p
->p_rtprio
;
375 bcopy("swapper", p
->p_comm
, sizeof ("swapper"));
376 bcopy("swapper", thread0
.td_comm
, sizeof ("swapper"));
378 /* Create credentials. */
379 p
->p_ucred
= crget();
380 p
->p_ucred
->cr_ruidinfo
= uifind(0);
381 p
->p_ucred
->cr_ngroups
= 1; /* group 0 */
382 p
->p_ucred
->cr_uidinfo
= uifind(0);
383 thread0
.td_ucred
= crhold(p
->p_ucred
); /* bootstrap fork1() */
386 p
->p_ucred
->cr_prison
= NULL
;
388 /* Create sigacts. */
389 p
->p_sigacts
= &sigacts0
;
390 p
->p_sigacts
->ps_refcnt
= 1;
392 /* Initialize signal state for process 0. */
395 /* Create the file descriptor table. */
396 fdinit_bootstrap(p
, &filedesc0
, cmask
);
398 /* Create the limits structures. */
399 plimit_init0(&limit0
);
400 p
->p_limit
= &limit0
;
402 /* Allocate a prototype map so we have something to fork. */
403 pmap_pinit0(vmspace_pmap(&vmspace0
));
404 p
->p_vmspace
= &vmspace0
;
405 lp
->lwp_vmspace
= p
->p_vmspace
;
406 sysref_init(&vmspace0
.vm_sysref
, &vmspace_sysref_class
);
407 vm_map_init(&vmspace0
.vm_map
,
408 round_page(VM_MIN_USER_ADDRESS
),
409 trunc_page(VM_MAX_USER_ADDRESS
),
410 vmspace_pmap(&vmspace0
));
411 sysref_activate(&vmspace0
.vm_sysref
);
413 kqueue_init(&lwp0
.lwp_kqueue
, &filedesc0
);
416 * Charge root for one process.
418 (void)chgproccnt(p
->p_ucred
->cr_uidinfo
, 1, 0);
421 SYSINIT(p0init
, SI_BOOT2_PROC0
, SI_ORDER_FIRST
, proc0_init
, NULL
)
423 static int proc0_post_callback(struct proc
*p
, void *data __unused
);
427 proc0_post(void *dummy __unused
)
432 * Now we can look at the time, having had a chance to verify the
433 * time from the file system. Pretend that proc0 started now.
435 allproc_scan(proc0_post_callback
, NULL
);
438 * Give the ``random'' number generator a thump.
439 * XXX: Does read_random() contain enough bits to be used here ?
442 skrandom(ts
.tv_sec
^ ts
.tv_nsec
);
446 proc0_post_callback(struct proc
*p
, void *data __unused
)
448 microtime(&p
->p_start
);
452 SYSINIT(p0post
, SI_SUB_PROC0_POST
, SI_ORDER_FIRST
, proc0_post
, NULL
)
455 ***************************************************************************
457 **** The following SYSINIT's and glue code should be moved to the
458 **** respective files on a per subsystem basis.
460 ***************************************************************************
465 ***************************************************************************
467 **** The following code probably belongs in another file, like
468 **** kern/init_init.c.
470 ***************************************************************************
474 * List of paths to try when searching for "init".
476 static char init_path
[MAXPATHLEN
] =
478 __XSTRING(INIT_PATH
);
480 "/sbin/init:/sbin/oinit:/sbin/init.bak";
482 SYSCTL_STRING(_kern
, OID_AUTO
, init_path
, CTLFLAG_RD
, init_path
, 0, "");
485 * Start the initial user process; try exec'ing each pathname in init_path.
486 * The program is invoked with one argument containing the boot flags.
488 * The MP lock is held on entry.
491 start_init(void *dummy
, struct trapframe
*frame
)
494 struct execve_args args
;
496 char *var
, *path
, *next
, *s
;
497 char *ucp
, **uap
, *arg0
, *arg1
;
505 lp
= ONLY_LWP_IN_PROC(p
);
507 /* Get the vnode for '/'. Set p->p_fd->fd_cdir to reference it. */
508 mp
= mountlist_boot_getfirst();
509 if (VFS_ROOT(mp
, &vp
))
510 panic("cannot find root vnode");
511 if (mp
->mnt_ncmountpt
.ncp
== NULL
) {
512 cache_allocroot(&mp
->mnt_ncmountpt
, mp
, vp
);
513 cache_unlock(&mp
->mnt_ncmountpt
); /* leave ref intact */
515 p
->p_fd
->fd_cdir
= vp
;
516 vref(p
->p_fd
->fd_cdir
);
517 p
->p_fd
->fd_rdir
= vp
;
518 vref(p
->p_fd
->fd_rdir
);
519 vfs_cache_setroot(vp
, cache_hold(&mp
->mnt_ncmountpt
));
520 vn_unlock(vp
); /* leave ref intact */
521 cache_copy(&mp
->mnt_ncmountpt
, &p
->p_fd
->fd_ncdir
);
522 cache_copy(&mp
->mnt_ncmountpt
, &p
->p_fd
->fd_nrdir
);
524 kprintf("Mounting devfs\n");
525 vfs_mountroot_devfs();
528 * Need just enough stack to hold the faked-up "execve()" arguments.
530 addr
= trunc_page(USRSTACK
- PAGE_SIZE
);
531 error
= vm_map_find(&p
->p_vmspace
->vm_map
, NULL
, 0, &addr
, PAGE_SIZE
,
534 VM_PROT_ALL
, VM_PROT_ALL
,
537 panic("init: couldn't allocate argument space");
538 p
->p_vmspace
->vm_maxsaddr
= (caddr_t
)addr
;
539 p
->p_vmspace
->vm_ssize
= 1;
541 if ((var
= kgetenv("init_path")) != NULL
) {
542 strncpy(init_path
, var
, sizeof init_path
);
543 init_path
[sizeof init_path
- 1] = 0;
545 if ((var
= kgetenv("kern.fallback_elf_brand")) != NULL
)
546 fallback_elf_brand
= strtol(var
, NULL
, 0);
548 for (path
= init_path
; *path
!= '\0'; path
= next
) {
553 for (next
= path
; *next
!= '\0' && *next
!= ':'; next
++)
556 kprintf("start_init: trying %.*s\n", (int)(next
- path
),
560 * Move out the boot flag argument.
563 ucp
= (char *)USRSTACK
;
564 (void)subyte(--ucp
, 0); /* trailing zero */
565 if (boothowto
& RB_SINGLE
) {
566 (void)subyte(--ucp
, 's');
570 if (boothowto
& RB_FASTBOOT
) {
571 (void)subyte(--ucp
, 'f');
577 (void)subyte(--ucp
, 'C');
581 (void)subyte(--ucp
, '-');
582 (void)subyte(--ucp
, '-'); /* leading hyphen */
586 * Move out the file name (also arg 0).
588 (void)subyte(--ucp
, 0);
589 for (s
= next
- 1; s
>= path
; s
--)
590 (void)subyte(--ucp
, *s
);
594 * Move out the arg pointers.
596 uap
= (char **)((intptr_t)ucp
& ~(sizeof(intptr_t)-1));
597 (void)suword((caddr_t
)--uap
, (long)0); /* terminator */
598 (void)suword((caddr_t
)--uap
, (long)(intptr_t)arg1
);
599 (void)suword((caddr_t
)--uap
, (long)(intptr_t)arg0
);
602 * Point at the arguments.
609 * Now try to exec the program. If can't for any reason
610 * other than it doesn't exist, complain.
612 * Otherwise, return via fork_trampoline() all the way
613 * to user mode as init!
615 * WARNING! We may have been moved to another cpu after
616 * acquiring the current user process designation. The
617 * MP lock will migrate with us though so we still have to
620 if ((error
= sys_execve(&args
)) == 0) {
622 lp
->lwp_proc
->p_usched
->acquire_curproc(lp
);
626 kprintf("exec %.*s: error %d\n", (int)(next
- path
),
629 kprintf("init: not found in path %s\n", init_path
);
634 * Like kthread_create(), but runs in it's own address space.
635 * We do this early to reserve pid 1.
637 * Note special case - do not make it runnable yet. Other work
638 * in progress will change this more.
641 create_init(const void *udata __unused
)
647 error
= fork1(&lwp0
, RFFDG
| RFPROC
, &initproc
);
649 panic("cannot fork init: %d", error
);
650 initproc
->p_flag
|= P_SYSTEM
;
651 lp
= ONLY_LWP_IN_PROC(initproc
);
652 cpu_set_fork_handler(lp
, start_init
, NULL
);
655 SYSINIT(init
, SI_SUB_CREATE_INIT
, SI_ORDER_FIRST
, create_init
, NULL
)
658 * Make it runnable now.
661 kick_init(const void *udata __unused
)
663 start_forked_proc(&lwp0
, initproc
);
665 SYSINIT(kickinit
, SI_SUB_KTHREAD_INIT
, SI_ORDER_FIRST
, kick_init
, NULL
)
668 * Machine independant globaldata initialization
670 * WARNING! Called from early boot, 'mycpu' may not work yet.
673 mi_gdinit(struct globaldata
*gd
, int cpuid
)
675 TAILQ_INIT(&gd
->gd_systimerq
);
676 gd
->gd_sysid_alloc
= cpuid
; /* prime low bits for cpu lookup */
677 gd
->gd_cpuid
= cpuid
;
678 gd
->gd_cpumask
= (cpumask_t
)1 << cpuid
;
680 vm_map_entry_reserve_cpu_init(gd
);