FreeBSD/Linux Kernel Cross Reference
sys/kern/init_main.c
1 /*-
2 * Copyright (c) 1995 Terrence R. Lambert
3 * All rights reserved.
4 *
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.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
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.
28 *
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
39 * SUCH DAMAGE.
40 *
41 * @(#)init_main.c 8.9 (Berkeley) 1/21/94
42 */
43
44 #include <sys/cdefs.h>
45 __FBSDID("$FreeBSD: releng/9.0/sys/kern/init_main.c 225617 2011-09-16 13:58:51Z kmacy $");
46
47 #include "opt_ddb.h"
48 #include "opt_init_path.h"
49
50 #include <sys/param.h>
51 #include <sys/kernel.h>
52 #include <sys/exec.h>
53 #include <sys/file.h>
54 #include <sys/filedesc.h>
55 #include <sys/jail.h>
56 #include <sys/ktr.h>
57 #include <sys/lock.h>
58 #include <sys/loginclass.h>
59 #include <sys/mount.h>
60 #include <sys/mutex.h>
61 #include <sys/syscallsubr.h>
62 #include <sys/sysctl.h>
63 #include <sys/proc.h>
64 #include <sys/racct.h>
65 #include <sys/resourcevar.h>
66 #include <sys/systm.h>
67 #include <sys/signalvar.h>
68 #include <sys/vnode.h>
69 #include <sys/sysent.h>
70 #include <sys/reboot.h>
71 #include <sys/sched.h>
72 #include <sys/sx.h>
73 #include <sys/sysproto.h>
74 #include <sys/vmmeter.h>
75 #include <sys/unistd.h>
76 #include <sys/malloc.h>
77 #include <sys/conf.h>
78 #include <sys/cpuset.h>
79
80 #include <machine/cpu.h>
81
82 #include <security/audit/audit.h>
83 #include <security/mac/mac_framework.h>
84
85 #include <vm/vm.h>
86 #include <vm/vm_param.h>
87 #include <vm/pmap.h>
88 #include <vm/vm_map.h>
89 #include <sys/copyright.h>
90
91 #include <ddb/ddb.h>
92 #include <ddb/db_sym.h>
93
94 void mi_startup(void); /* Should be elsewhere */
95
96 /* Components of the first process -- never freed. */
97 static struct session session0;
98 static struct pgrp pgrp0;
99 struct proc proc0;
100 struct thread thread0 __aligned(16);
101 struct vmspace vmspace0;
102 struct proc *initproc;
103
104 int boothowto = 0; /* initialized so that it can be patched */
105 SYSCTL_INT(_debug, OID_AUTO, boothowto, CTLFLAG_RD, &boothowto, 0,
106 "Boot control flags, passed from loader");
107 int bootverbose;
108 SYSCTL_INT(_debug, OID_AUTO, bootverbose, CTLFLAG_RW, &bootverbose, 0,
109 "Control the output of verbose kernel messages");
110
111 /*
112 * This ensures that there is at least one entry so that the sysinit_set
113 * symbol is not undefined. A sybsystem ID of SI_SUB_DUMMY is never
114 * executed.
115 */
116 SYSINIT(placeholder, SI_SUB_DUMMY, SI_ORDER_ANY, NULL, NULL);
117
118 /*
119 * The sysinit table itself. Items are checked off as the are run.
120 * If we want to register new sysinit types, add them to newsysinit.
121 */
122 SET_DECLARE(sysinit_set, struct sysinit);
123 struct sysinit **sysinit, **sysinit_end;
124 struct sysinit **newsysinit, **newsysinit_end;
125
126 /*
127 * Merge a new sysinit set into the current set, reallocating it if
128 * necessary. This can only be called after malloc is running.
129 */
130 void
131 sysinit_add(struct sysinit **set, struct sysinit **set_end)
132 {
133 struct sysinit **newset;
134 struct sysinit **sipp;
135 struct sysinit **xipp;
136 int count;
137
138 count = set_end - set;
139 if (newsysinit)
140 count += newsysinit_end - newsysinit;
141 else
142 count += sysinit_end - sysinit;
143 newset = malloc(count * sizeof(*sipp), M_TEMP, M_NOWAIT);
144 if (newset == NULL)
145 panic("cannot malloc for sysinit");
146 xipp = newset;
147 if (newsysinit)
148 for (sipp = newsysinit; sipp < newsysinit_end; sipp++)
149 *xipp++ = *sipp;
150 else
151 for (sipp = sysinit; sipp < sysinit_end; sipp++)
152 *xipp++ = *sipp;
153 for (sipp = set; sipp < set_end; sipp++)
154 *xipp++ = *sipp;
155 if (newsysinit)
156 free(newsysinit, M_TEMP);
157 newsysinit = newset;
158 newsysinit_end = newset + count;
159 }
160
161 /*
162 * System startup; initialize the world, create process 0, mount root
163 * filesystem, and fork to create init and pagedaemon. Most of the
164 * hard work is done in the lower-level initialization routines including
165 * startup(), which does memory initialization and autoconfiguration.
166 *
167 * This allows simple addition of new kernel subsystems that require
168 * boot time initialization. It also allows substitution of subsystem
169 * (for instance, a scheduler, kernel profiler, or VM system) by object
170 * module. Finally, it allows for optional "kernel threads".
171 */
172 void
173 mi_startup(void)
174 {
175
176 register struct sysinit **sipp; /* system initialization*/
177 register struct sysinit **xipp; /* interior loop of sort*/
178 register struct sysinit *save; /* bubble*/
179
180 #if defined(VERBOSE_SYSINIT)
181 int last;
182 int verbose;
183 #endif
184
185 if (boothowto & RB_VERBOSE)
186 bootverbose++;
187
188 if (sysinit == NULL) {
189 sysinit = SET_BEGIN(sysinit_set);
190 sysinit_end = SET_LIMIT(sysinit_set);
191 }
192
193 restart:
194 /*
195 * Perform a bubble sort of the system initialization objects by
196 * their subsystem (primary key) and order (secondary key).
197 */
198 for (sipp = sysinit; sipp < sysinit_end; sipp++) {
199 for (xipp = sipp + 1; xipp < sysinit_end; xipp++) {
200 if ((*sipp)->subsystem < (*xipp)->subsystem ||
201 ((*sipp)->subsystem == (*xipp)->subsystem &&
202 (*sipp)->order <= (*xipp)->order))
203 continue; /* skip*/
204 save = *sipp;
205 *sipp = *xipp;
206 *xipp = save;
207 }
208 }
209
210 #if defined(VERBOSE_SYSINIT)
211 last = SI_SUB_COPYRIGHT;
212 verbose = 0;
213 #if !defined(DDB)
214 printf("VERBOSE_SYSINIT: DDB not enabled, symbol lookups disabled.\n");
215 #endif
216 #endif
217
218 /*
219 * Traverse the (now) ordered list of system initialization tasks.
220 * Perform each task, and continue on to the next task.
221 *
222 * The last item on the list is expected to be the scheduler,
223 * which will not return.
224 */
225 for (sipp = sysinit; sipp < sysinit_end; sipp++) {
226
227 if ((*sipp)->subsystem == SI_SUB_DUMMY)
228 continue; /* skip dummy task(s)*/
229
230 if ((*sipp)->subsystem == SI_SUB_DONE)
231 continue;
232
233 #if defined(VERBOSE_SYSINIT)
234 if ((*sipp)->subsystem > last) {
235 verbose = 1;
236 last = (*sipp)->subsystem;
237 printf("subsystem %x\n", last);
238 }
239 if (verbose) {
240 #if defined(DDB)
241 const char *name;
242 c_db_sym_t sym;
243 db_expr_t offset;
244
245 sym = db_search_symbol((vm_offset_t)(*sipp)->func,
246 DB_STGY_PROC, &offset);
247 db_symbol_values(sym, &name, NULL);
248 if (name != NULL)
249 printf(" %s(%p)... ", name, (*sipp)->udata);
250 else
251 #endif
252 printf(" %p(%p)... ", (*sipp)->func,
253 (*sipp)->udata);
254 }
255 #endif
256
257 /* Call function */
258 (*((*sipp)->func))((*sipp)->udata);
259
260 #if defined(VERBOSE_SYSINIT)
261 if (verbose)
262 printf("done.\n");
263 #endif
264
265 /* Check off the one we're just done */
266 (*sipp)->subsystem = SI_SUB_DONE;
267
268 /* Check if we've installed more sysinit items via KLD */
269 if (newsysinit != NULL) {
270 if (sysinit != SET_BEGIN(sysinit_set))
271 free(sysinit, M_TEMP);
272 sysinit = newsysinit;
273 sysinit_end = newsysinit_end;
274 newsysinit = NULL;
275 newsysinit_end = NULL;
276 goto restart;
277 }
278 }
279
280 panic("Shouldn't get here!");
281 /* NOTREACHED*/
282 }
283
284
285 /*
286 ***************************************************************************
287 ****
288 **** The following SYSINIT's belong elsewhere, but have not yet
289 **** been moved.
290 ****
291 ***************************************************************************
292 */
293 static void
294 print_caddr_t(void *data)
295 {
296 printf("%s", (char *)data);
297 }
298
299 static void
300 print_version(void *data __unused)
301 {
302 int len;
303
304 /* Strip a trailing newline from version. */
305 len = strlen(version);
306 while (len > 0 && version[len - 1] == '\n')
307 len--;
308 printf("%.*s %s\n", len, version, machine);
309 }
310
311 SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t,
312 copyright);
313 SYSINIT(trademark, SI_SUB_COPYRIGHT, SI_ORDER_SECOND, print_caddr_t,
314 trademark);
315 SYSINIT(version, SI_SUB_COPYRIGHT, SI_ORDER_THIRD, print_version, NULL);
316
317 #ifdef WITNESS
318 static char wit_warn[] =
319 "WARNING: WITNESS option enabled, expect reduced performance.\n";
320 SYSINIT(witwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 1,
321 print_caddr_t, wit_warn);
322 SYSINIT(witwarn2, SI_SUB_RUN_SCHEDULER, SI_ORDER_THIRD + 1,
323 print_caddr_t, wit_warn);
324 #endif
325
326 #ifdef DIAGNOSTIC
327 static char diag_warn[] =
328 "WARNING: DIAGNOSTIC option enabled, expect reduced performance.\n";
329 SYSINIT(diagwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 2,
330 print_caddr_t, diag_warn);
331 SYSINIT(diagwarn2, SI_SUB_RUN_SCHEDULER, SI_ORDER_THIRD + 2,
332 print_caddr_t, diag_warn);
333 #endif
334
335 static int
336 null_fetch_syscall_args(struct thread *td __unused,
337 struct syscall_args *sa __unused)
338 {
339
340 panic("null_fetch_syscall_args");
341 }
342
343 static void
344 null_set_syscall_retval(struct thread *td __unused, int error __unused)
345 {
346
347 panic("null_set_syscall_retval");
348 }
349
350 struct sysentvec null_sysvec = {
351 .sv_size = 0,
352 .sv_table = NULL,
353 .sv_mask = 0,
354 .sv_sigsize = 0,
355 .sv_sigtbl = NULL,
356 .sv_errsize = 0,
357 .sv_errtbl = NULL,
358 .sv_transtrap = NULL,
359 .sv_fixup = NULL,
360 .sv_sendsig = NULL,
361 .sv_sigcode = NULL,
362 .sv_szsigcode = NULL,
363 .sv_prepsyscall = NULL,
364 .sv_name = "null",
365 .sv_coredump = NULL,
366 .sv_imgact_try = NULL,
367 .sv_minsigstksz = 0,
368 .sv_pagesize = PAGE_SIZE,
369 .sv_minuser = VM_MIN_ADDRESS,
370 .sv_maxuser = VM_MAXUSER_ADDRESS,
371 .sv_usrstack = USRSTACK,
372 .sv_psstrings = PS_STRINGS,
373 .sv_stackprot = VM_PROT_ALL,
374 .sv_copyout_strings = NULL,
375 .sv_setregs = NULL,
376 .sv_fixlimit = NULL,
377 .sv_maxssiz = NULL,
378 .sv_flags = 0,
379 .sv_set_syscall_retval = null_set_syscall_retval,
380 .sv_fetch_syscall_args = null_fetch_syscall_args,
381 .sv_syscallnames = NULL,
382 .sv_schedtail = NULL,
383 };
384
385 /*
386 ***************************************************************************
387 ****
388 **** The two following SYSINIT's are proc0 specific glue code. I am not
389 **** convinced that they can not be safely combined, but their order of
390 **** operation has been maintained as the same as the original init_main.c
391 **** for right now.
392 ****
393 **** These probably belong in init_proc.c or kern_proc.c, since they
394 **** deal with proc0 (the fork template process).
395 ****
396 ***************************************************************************
397 */
398 /* ARGSUSED*/
399 static void
400 proc0_init(void *dummy __unused)
401 {
402 struct proc *p;
403 struct thread *td;
404 vm_paddr_t pageablemem;
405 int i;
406
407 GIANT_REQUIRED;
408 p = &proc0;
409 td = &thread0;
410
411 /*
412 * Initialize magic number and osrel.
413 */
414 p->p_magic = P_MAGIC;
415 p->p_osrel = osreldate;
416
417 /*
418 * Initialize thread and process structures.
419 */
420 procinit(); /* set up proc zone */
421 threadinit(); /* set up UMA zones */
422
423 /*
424 * Initialise scheduler resources.
425 * Add scheduler specific parts to proc, thread as needed.
426 */
427 schedinit(); /* scheduler gets its house in order */
428 /*
429 * Initialize sleep queue hash table
430 */
431 sleepinit();
432
433 /*
434 * additional VM structures
435 */
436 vm_init2();
437
438 /*
439 * Create process 0 (the swapper).
440 */
441 LIST_INSERT_HEAD(&allproc, p, p_list);
442 LIST_INSERT_HEAD(PIDHASH(0), p, p_hash);
443 mtx_init(&pgrp0.pg_mtx, "process group", NULL, MTX_DEF | MTX_DUPOK);
444 p->p_pgrp = &pgrp0;
445 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash);
446 LIST_INIT(&pgrp0.pg_members);
447 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist);
448
449 pgrp0.pg_session = &session0;
450 mtx_init(&session0.s_mtx, "session", NULL, MTX_DEF);
451 refcount_init(&session0.s_count, 1);
452 session0.s_leader = p;
453
454 p->p_sysent = &null_sysvec;
455 p->p_flag = P_SYSTEM | P_INMEM;
456 p->p_state = PRS_NORMAL;
457 knlist_init_mtx(&p->p_klist, &p->p_mtx);
458 STAILQ_INIT(&p->p_ktr);
459 p->p_nice = NZERO;
460 td->td_tid = PID_MAX + 1;
461 LIST_INSERT_HEAD(TIDHASH(td->td_tid), td, td_hash);
462 td->td_state = TDS_RUNNING;
463 td->td_pri_class = PRI_TIMESHARE;
464 td->td_user_pri = PUSER;
465 td->td_base_user_pri = PUSER;
466 td->td_lend_user_pri = PRI_MAX;
467 td->td_priority = PVM;
468 td->td_base_pri = PVM;
469 td->td_oncpu = 0;
470 td->td_flags = TDF_INMEM|TDP_KTHREAD;
471 td->td_cpuset = cpuset_thread0();
472 prison0.pr_cpuset = cpuset_ref(td->td_cpuset);
473 p->p_peers = 0;
474 p->p_leader = p;
475
476
477 strncpy(p->p_comm, "kernel", sizeof (p->p_comm));
478 strncpy(td->td_name, "swapper", sizeof (td->td_name));
479
480 callout_init(&p->p_itcallout, CALLOUT_MPSAFE);
481 callout_init_mtx(&p->p_limco, &p->p_mtx, 0);
482 callout_init(&td->td_slpcallout, CALLOUT_MPSAFE);
483
484 /* Create credentials. */
485 p->p_ucred = crget();
486 p->p_ucred->cr_ngroups = 1; /* group 0 */
487 p->p_ucred->cr_uidinfo = uifind(0);
488 p->p_ucred->cr_ruidinfo = uifind(0);
489 p->p_ucred->cr_prison = &prison0;
490 p->p_ucred->cr_loginclass = loginclass_find("default");
491 #ifdef AUDIT
492 audit_cred_kproc0(p->p_ucred);
493 #endif
494 #ifdef MAC
495 mac_cred_create_swapper(p->p_ucred);
496 #endif
497 td->td_ucred = crhold(p->p_ucred);
498
499 /* Create sigacts. */
500 p->p_sigacts = sigacts_alloc();
501
502 /* Initialize signal state for process 0. */
503 siginit(&proc0);
504
505 /* Create the file descriptor table. */
506 p->p_fd = fdinit(NULL);
507 p->p_fdtol = NULL;
508
509 /* Create the limits structures. */
510 p->p_limit = lim_alloc();
511 for (i = 0; i < RLIM_NLIMITS; i++)
512 p->p_limit->pl_rlimit[i].rlim_cur =
513 p->p_limit->pl_rlimit[i].rlim_max = RLIM_INFINITY;
514 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_cur =
515 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles;
516 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_cur =
517 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc;
518 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_cur = dfldsiz;
519 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_max = maxdsiz;
520 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_cur = dflssiz;
521 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_max = maxssiz;
522 /* Cast to avoid overflow on i386/PAE. */
523 pageablemem = ptoa((vm_paddr_t)cnt.v_free_count);
524 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_cur =
525 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_max = pageablemem;
526 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = pageablemem / 3;
527 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_max = pageablemem;
528 p->p_cpulimit = RLIM_INFINITY;
529
530 /* Initialize resource accounting structures. */
531 racct_create(&p->p_racct);
532
533 p->p_stats = pstats_alloc();
534
535 /* Allocate a prototype map so we have something to fork. */
536 pmap_pinit0(vmspace_pmap(&vmspace0));
537 p->p_vmspace = &vmspace0;
538 vmspace0.vm_refcnt = 1;
539
540 /*
541 * proc0 is not expected to enter usermode, so there is no special
542 * handling for sv_minuser here, like is done for exec_new_vmspace().
543 */
544 vm_map_init(&vmspace0.vm_map, vmspace_pmap(&vmspace0),
545 p->p_sysent->sv_minuser, p->p_sysent->sv_maxuser);
546
547 /*
548 * Call the init and ctor for the new thread and proc. We wait
549 * to do this until all other structures are fairly sane.
550 */
551 EVENTHANDLER_INVOKE(process_init, p);
552 EVENTHANDLER_INVOKE(thread_init, td);
553 EVENTHANDLER_INVOKE(process_ctor, p);
554 EVENTHANDLER_INVOKE(thread_ctor, td);
555
556 /*
557 * Charge root for one process.
558 */
559 (void)chgproccnt(p->p_ucred->cr_ruidinfo, 1, 0);
560 PROC_LOCK(p);
561 racct_add_force(p, RACCT_NPROC, 1);
562 PROC_UNLOCK(p);
563 }
564 SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL);
565
566 /* ARGSUSED*/
567 static void
568 proc0_post(void *dummy __unused)
569 {
570 struct timespec ts;
571 struct proc *p;
572 struct rusage ru;
573 struct thread *td;
574
575 /*
576 * Now we can look at the time, having had a chance to verify the
577 * time from the filesystem. Pretend that proc0 started now.
578 */
579 sx_slock(&allproc_lock);
580 FOREACH_PROC_IN_SYSTEM(p) {
581 microuptime(&p->p_stats->p_start);
582 PROC_SLOCK(p);
583 rufetch(p, &ru); /* Clears thread stats */
584 PROC_SUNLOCK(p);
585 p->p_rux.rux_runtime = 0;
586 p->p_rux.rux_uticks = 0;
587 p->p_rux.rux_sticks = 0;
588 p->p_rux.rux_iticks = 0;
589 FOREACH_THREAD_IN_PROC(p, td) {
590 td->td_runtime = 0;
591 }
592 }
593 sx_sunlock(&allproc_lock);
594 PCPU_SET(switchtime, cpu_ticks());
595 PCPU_SET(switchticks, ticks);
596
597 /*
598 * Give the ``random'' number generator a thump.
599 */
600 nanotime(&ts);
601 srandom(ts.tv_sec ^ ts.tv_nsec);
602 }
603 SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL);
604
605 static void
606 random_init(void *dummy __unused)
607 {
608
609 /*
610 * After CPU has been started we have some randomness on most
611 * platforms via get_cyclecount(). For platforms that don't
612 * we will reseed random(9) in proc0_post() as well.
613 */
614 srandom(get_cyclecount());
615 }
616 SYSINIT(random, SI_SUB_RANDOM, SI_ORDER_FIRST, random_init, NULL);
617
618 /*
619 ***************************************************************************
620 ****
621 **** The following SYSINIT's and glue code should be moved to the
622 **** respective files on a per subsystem basis.
623 ****
624 ***************************************************************************
625 */
626
627
628 /*
629 ***************************************************************************
630 ****
631 **** The following code probably belongs in another file, like
632 **** kern/init_init.c.
633 ****
634 ***************************************************************************
635 */
636
637 /*
638 * List of paths to try when searching for "init".
639 */
640 static char init_path[MAXPATHLEN] =
641 #ifdef INIT_PATH
642 __XSTRING(INIT_PATH);
643 #else
644 "/sbin/init:/sbin/oinit:/sbin/init.bak:/rescue/init:/stand/sysinstall";
645 #endif
646 SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0,
647 "Path used to search the init process");
648
649 /*
650 * Shutdown timeout of init(8).
651 * Unused within kernel, but used to control init(8), hence do not remove.
652 */
653 #ifndef INIT_SHUTDOWN_TIMEOUT
654 #define INIT_SHUTDOWN_TIMEOUT 120
655 #endif
656 static int init_shutdown_timeout = INIT_SHUTDOWN_TIMEOUT;
657 SYSCTL_INT(_kern, OID_AUTO, init_shutdown_timeout,
658 CTLFLAG_RW, &init_shutdown_timeout, 0, "Shutdown timeout of init(8). "
659 "Unused within kernel, but used to control init(8)");
660
661 /*
662 * Start the initial user process; try exec'ing each pathname in init_path.
663 * The program is invoked with one argument containing the boot flags.
664 */
665 static void
666 start_init(void *dummy)
667 {
668 vm_offset_t addr;
669 struct execve_args args;
670 int options, error;
671 char *var, *path, *next, *s;
672 char *ucp, **uap, *arg0, *arg1;
673 struct thread *td;
674 struct proc *p;
675
676 mtx_lock(&Giant);
677
678 GIANT_REQUIRED;
679
680 td = curthread;
681 p = td->td_proc;
682
683 vfs_mountroot();
684
685 /*
686 * Need just enough stack to hold the faked-up "execve()" arguments.
687 */
688 addr = p->p_sysent->sv_usrstack - PAGE_SIZE;
689 if (vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &addr, PAGE_SIZE,
690 FALSE, VM_PROT_ALL, VM_PROT_ALL, 0) != 0)
691 panic("init: couldn't allocate argument space");
692 p->p_vmspace->vm_maxsaddr = (caddr_t)addr;
693 p->p_vmspace->vm_ssize = 1;
694
695 if ((var = getenv("init_path")) != NULL) {
696 strlcpy(init_path, var, sizeof(init_path));
697 freeenv(var);
698 }
699
700 for (path = init_path; *path != '\0'; path = next) {
701 while (*path == ':')
702 path++;
703 if (*path == '\0')
704 break;
705 for (next = path; *next != '\0' && *next != ':'; next++)
706 /* nothing */ ;
707 if (bootverbose)
708 printf("start_init: trying %.*s\n", (int)(next - path),
709 path);
710
711 /*
712 * Move out the boot flag argument.
713 */
714 options = 0;
715 ucp = (char *)p->p_sysent->sv_usrstack;
716 (void)subyte(--ucp, 0); /* trailing zero */
717 if (boothowto & RB_SINGLE) {
718 (void)subyte(--ucp, 's');
719 options = 1;
720 }
721 #ifdef notyet
722 if (boothowto & RB_FASTBOOT) {
723 (void)subyte(--ucp, 'f');
724 options = 1;
725 }
726 #endif
727
728 #ifdef BOOTCDROM
729 (void)subyte(--ucp, 'C');
730 options = 1;
731 #endif
732
733 if (options == 0)
734 (void)subyte(--ucp, '-');
735 (void)subyte(--ucp, '-'); /* leading hyphen */
736 arg1 = ucp;
737
738 /*
739 * Move out the file name (also arg 0).
740 */
741 (void)subyte(--ucp, 0);
742 for (s = next - 1; s >= path; s--)
743 (void)subyte(--ucp, *s);
744 arg0 = ucp;
745
746 /*
747 * Move out the arg pointers.
748 */
749 uap = (char **)((intptr_t)ucp & ~(sizeof(intptr_t)-1));
750 (void)suword((caddr_t)--uap, (long)0); /* terminator */
751 (void)suword((caddr_t)--uap, (long)(intptr_t)arg1);
752 (void)suword((caddr_t)--uap, (long)(intptr_t)arg0);
753
754 /*
755 * Point at the arguments.
756 */
757 args.fname = arg0;
758 args.argv = uap;
759 args.envv = NULL;
760
761 /*
762 * Now try to exec the program. If can't for any reason
763 * other than it doesn't exist, complain.
764 *
765 * Otherwise, return via fork_trampoline() all the way
766 * to user mode as init!
767 */
768 if ((error = sys_execve(td, &args)) == 0) {
769 mtx_unlock(&Giant);
770 return;
771 }
772 if (error != ENOENT)
773 printf("exec %.*s: error %d\n", (int)(next - path),
774 path, error);
775 }
776 printf("init: not found in path %s\n", init_path);
777 panic("no init");
778 }
779
780 /*
781 * Like kproc_create(), but runs in it's own address space.
782 * We do this early to reserve pid 1.
783 *
784 * Note special case - do not make it runnable yet. Other work
785 * in progress will change this more.
786 */
787 static void
788 create_init(const void *udata __unused)
789 {
790 struct ucred *newcred, *oldcred;
791 int error;
792
793 error = fork1(&thread0, RFFDG | RFPROC | RFSTOPPED, 0, &initproc,
794 NULL, 0);
795 if (error)
796 panic("cannot fork init: %d\n", error);
797 KASSERT(initproc->p_pid == 1, ("create_init: initproc->p_pid != 1"));
798 /* divorce init's credentials from the kernel's */
799 newcred = crget();
800 PROC_LOCK(initproc);
801 initproc->p_flag |= P_SYSTEM | P_INMEM;
802 oldcred = initproc->p_ucred;
803 crcopy(newcred, oldcred);
804 #ifdef MAC
805 mac_cred_create_init(newcred);
806 #endif
807 #ifdef AUDIT
808 audit_cred_proc1(newcred);
809 #endif
810 initproc->p_ucred = newcred;
811 PROC_UNLOCK(initproc);
812 crfree(oldcred);
813 cred_update_thread(FIRST_THREAD_IN_PROC(initproc));
814 cpu_set_fork_handler(FIRST_THREAD_IN_PROC(initproc), start_init, NULL);
815 }
816 SYSINIT(init, SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL);
817
818 /*
819 * Make it runnable now.
820 */
821 static void
822 kick_init(const void *udata __unused)
823 {
824 struct thread *td;
825
826 td = FIRST_THREAD_IN_PROC(initproc);
827 thread_lock(td);
828 TD_SET_CAN_RUN(td);
829 sched_add(td, SRQ_BORING);
830 thread_unlock(td);
831 }
832 SYSINIT(kickinit, SI_SUB_KTHREAD_INIT, SI_ORDER_FIRST, kick_init, NULL);
Cache object: f8af34c3bb9cbef02f5d5f8289d4405b
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