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/8.0/sys/kern/init_main.c 198434 2009-10-24 04:55:14Z ru $");
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/mount.h>
59 #include <sys/mutex.h>
60 #include <sys/syscallsubr.h>
61 #include <sys/sysctl.h>
62 #include <sys/proc.h>
63 #include <sys/resourcevar.h>
64 #include <sys/systm.h>
65 #include <sys/signalvar.h>
66 #include <sys/vnode.h>
67 #include <sys/sysent.h>
68 #include <sys/reboot.h>
69 #include <sys/sched.h>
70 #include <sys/sx.h>
71 #include <sys/sysproto.h>
72 #include <sys/vmmeter.h>
73 #include <sys/unistd.h>
74 #include <sys/malloc.h>
75 #include <sys/conf.h>
76 #include <sys/cpuset.h>
77
78 #include <machine/cpu.h>
79
80 #include <security/audit/audit.h>
81 #include <security/mac/mac_framework.h>
82
83 #include <vm/vm.h>
84 #include <vm/vm_param.h>
85 #include <vm/pmap.h>
86 #include <vm/vm_map.h>
87 #include <sys/copyright.h>
88
89 #include <ddb/ddb.h>
90 #include <ddb/db_sym.h>
91
92 void mi_startup(void); /* Should be elsewhere */
93
94 /* Components of the first process -- never freed. */
95 static struct session session0;
96 static struct pgrp pgrp0;
97 struct proc proc0;
98 struct thread thread0 __aligned(16);
99 struct vmspace vmspace0;
100 struct proc *initproc;
101
102 int boothowto = 0; /* initialized so that it can be patched */
103 SYSCTL_INT(_debug, OID_AUTO, boothowto, CTLFLAG_RD, &boothowto, 0, "");
104 int bootverbose;
105 SYSCTL_INT(_debug, OID_AUTO, bootverbose, CTLFLAG_RW, &bootverbose, 0, "");
106
107 /*
108 * This ensures that there is at least one entry so that the sysinit_set
109 * symbol is not undefined. A sybsystem ID of SI_SUB_DUMMY is never
110 * executed.
111 */
112 SYSINIT(placeholder, SI_SUB_DUMMY, SI_ORDER_ANY, NULL, NULL);
113
114 /*
115 * The sysinit table itself. Items are checked off as the are run.
116 * If we want to register new sysinit types, add them to newsysinit.
117 */
118 SET_DECLARE(sysinit_set, struct sysinit);
119 struct sysinit **sysinit, **sysinit_end;
120 struct sysinit **newsysinit, **newsysinit_end;
121
122 /*
123 * Merge a new sysinit set into the current set, reallocating it if
124 * necessary. This can only be called after malloc is running.
125 */
126 void
127 sysinit_add(struct sysinit **set, struct sysinit **set_end)
128 {
129 struct sysinit **newset;
130 struct sysinit **sipp;
131 struct sysinit **xipp;
132 int count;
133
134 count = set_end - set;
135 if (newsysinit)
136 count += newsysinit_end - newsysinit;
137 else
138 count += sysinit_end - sysinit;
139 newset = malloc(count * sizeof(*sipp), M_TEMP, M_NOWAIT);
140 if (newset == NULL)
141 panic("cannot malloc for sysinit");
142 xipp = newset;
143 if (newsysinit)
144 for (sipp = newsysinit; sipp < newsysinit_end; sipp++)
145 *xipp++ = *sipp;
146 else
147 for (sipp = sysinit; sipp < sysinit_end; sipp++)
148 *xipp++ = *sipp;
149 for (sipp = set; sipp < set_end; sipp++)
150 *xipp++ = *sipp;
151 if (newsysinit)
152 free(newsysinit, M_TEMP);
153 newsysinit = newset;
154 newsysinit_end = newset + count;
155 }
156
157 /*
158 * System startup; initialize the world, create process 0, mount root
159 * filesystem, and fork to create init and pagedaemon. Most of the
160 * hard work is done in the lower-level initialization routines including
161 * startup(), which does memory initialization and autoconfiguration.
162 *
163 * This allows simple addition of new kernel subsystems that require
164 * boot time initialization. It also allows substitution of subsystem
165 * (for instance, a scheduler, kernel profiler, or VM system) by object
166 * module. Finally, it allows for optional "kernel threads".
167 */
168 void
169 mi_startup(void)
170 {
171
172 register struct sysinit **sipp; /* system initialization*/
173 register struct sysinit **xipp; /* interior loop of sort*/
174 register struct sysinit *save; /* bubble*/
175
176 #if defined(VERBOSE_SYSINIT)
177 int last;
178 int verbose;
179 #endif
180
181 if (sysinit == NULL) {
182 sysinit = SET_BEGIN(sysinit_set);
183 sysinit_end = SET_LIMIT(sysinit_set);
184 }
185
186 restart:
187 /*
188 * Perform a bubble sort of the system initialization objects by
189 * their subsystem (primary key) and order (secondary key).
190 */
191 for (sipp = sysinit; sipp < sysinit_end; sipp++) {
192 for (xipp = sipp + 1; xipp < sysinit_end; xipp++) {
193 if ((*sipp)->subsystem < (*xipp)->subsystem ||
194 ((*sipp)->subsystem == (*xipp)->subsystem &&
195 (*sipp)->order <= (*xipp)->order))
196 continue; /* skip*/
197 save = *sipp;
198 *sipp = *xipp;
199 *xipp = save;
200 }
201 }
202
203 #if defined(VERBOSE_SYSINIT)
204 last = SI_SUB_COPYRIGHT;
205 verbose = 0;
206 #if !defined(DDB)
207 printf("VERBOSE_SYSINIT: DDB not enabled, symbol lookups disabled.\n");
208 #endif
209 #endif
210
211 /*
212 * Traverse the (now) ordered list of system initialization tasks.
213 * Perform each task, and continue on to the next task.
214 *
215 * The last item on the list is expected to be the scheduler,
216 * which will not return.
217 */
218 for (sipp = sysinit; sipp < sysinit_end; sipp++) {
219
220 if ((*sipp)->subsystem == SI_SUB_DUMMY)
221 continue; /* skip dummy task(s)*/
222
223 if ((*sipp)->subsystem == SI_SUB_DONE)
224 continue;
225
226 #if defined(VERBOSE_SYSINIT)
227 if ((*sipp)->subsystem > last) {
228 verbose = 1;
229 last = (*sipp)->subsystem;
230 printf("subsystem %x\n", last);
231 }
232 if (verbose) {
233 #if defined(DDB)
234 const char *name;
235 c_db_sym_t sym;
236 db_expr_t offset;
237
238 sym = db_search_symbol((vm_offset_t)(*sipp)->func,
239 DB_STGY_PROC, &offset);
240 db_symbol_values(sym, &name, NULL);
241 if (name != NULL)
242 printf(" %s(%p)... ", name, (*sipp)->udata);
243 else
244 #endif
245 printf(" %p(%p)... ", (*sipp)->func,
246 (*sipp)->udata);
247 }
248 #endif
249
250 /* Call function */
251 (*((*sipp)->func))((*sipp)->udata);
252
253 #if defined(VERBOSE_SYSINIT)
254 if (verbose)
255 printf("done.\n");
256 #endif
257
258 /* Check off the one we're just done */
259 (*sipp)->subsystem = SI_SUB_DONE;
260
261 /* Check if we've installed more sysinit items via KLD */
262 if (newsysinit != NULL) {
263 if (sysinit != SET_BEGIN(sysinit_set))
264 free(sysinit, M_TEMP);
265 sysinit = newsysinit;
266 sysinit_end = newsysinit_end;
267 newsysinit = NULL;
268 newsysinit_end = NULL;
269 goto restart;
270 }
271 }
272
273 panic("Shouldn't get here!");
274 /* NOTREACHED*/
275 }
276
277
278 /*
279 ***************************************************************************
280 ****
281 **** The following SYSINIT's belong elsewhere, but have not yet
282 **** been moved.
283 ****
284 ***************************************************************************
285 */
286 static void
287 print_caddr_t(void *data __unused)
288 {
289 printf("%s", (char *)data);
290 }
291 SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t,
292 copyright);
293 SYSINIT(trademark, SI_SUB_COPYRIGHT, SI_ORDER_SECOND, print_caddr_t,
294 trademark);
295 SYSINIT(version, SI_SUB_COPYRIGHT, SI_ORDER_THIRD, print_caddr_t, version);
296
297 #ifdef WITNESS
298 static char wit_warn[] =
299 "WARNING: WITNESS option enabled, expect reduced performance.\n";
300 SYSINIT(witwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 1,
301 print_caddr_t, wit_warn);
302 SYSINIT(witwarn2, SI_SUB_RUN_SCHEDULER, SI_ORDER_THIRD + 1,
303 print_caddr_t, wit_warn);
304 #endif
305
306 #ifdef DIAGNOSTIC
307 static char diag_warn[] =
308 "WARNING: DIAGNOSTIC option enabled, expect reduced performance.\n";
309 SYSINIT(diagwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 2,
310 print_caddr_t, diag_warn);
311 SYSINIT(diagwarn2, SI_SUB_RUN_SCHEDULER, SI_ORDER_THIRD + 2,
312 print_caddr_t, diag_warn);
313 #endif
314
315 static void
316 set_boot_verbose(void *data __unused)
317 {
318
319 if (boothowto & RB_VERBOSE)
320 bootverbose++;
321 }
322 SYSINIT(boot_verbose, SI_SUB_TUNABLES, SI_ORDER_ANY, set_boot_verbose, NULL);
323
324 struct sysentvec null_sysvec = {
325 .sv_size = 0,
326 .sv_table = NULL,
327 .sv_mask = 0,
328 .sv_sigsize = 0,
329 .sv_sigtbl = NULL,
330 .sv_errsize = 0,
331 .sv_errtbl = NULL,
332 .sv_transtrap = NULL,
333 .sv_fixup = NULL,
334 .sv_sendsig = NULL,
335 .sv_sigcode = NULL,
336 .sv_szsigcode = NULL,
337 .sv_prepsyscall = NULL,
338 .sv_name = "null",
339 .sv_coredump = NULL,
340 .sv_imgact_try = NULL,
341 .sv_minsigstksz = 0,
342 .sv_pagesize = PAGE_SIZE,
343 .sv_minuser = VM_MIN_ADDRESS,
344 .sv_maxuser = VM_MAXUSER_ADDRESS,
345 .sv_usrstack = USRSTACK,
346 .sv_psstrings = PS_STRINGS,
347 .sv_stackprot = VM_PROT_ALL,
348 .sv_copyout_strings = NULL,
349 .sv_setregs = NULL,
350 .sv_fixlimit = NULL,
351 .sv_maxssiz = NULL
352 };
353
354 /*
355 ***************************************************************************
356 ****
357 **** The two following SYSINIT's are proc0 specific glue code. I am not
358 **** convinced that they can not be safely combined, but their order of
359 **** operation has been maintained as the same as the original init_main.c
360 **** for right now.
361 ****
362 **** These probably belong in init_proc.c or kern_proc.c, since they
363 **** deal with proc0 (the fork template process).
364 ****
365 ***************************************************************************
366 */
367 /* ARGSUSED*/
368 static void
369 proc0_init(void *dummy __unused)
370 {
371 struct proc *p;
372 unsigned i;
373 struct thread *td;
374
375 GIANT_REQUIRED;
376 p = &proc0;
377 td = &thread0;
378
379 /*
380 * Initialize magic number and osrel.
381 */
382 p->p_magic = P_MAGIC;
383 p->p_osrel = osreldate;
384
385 /*
386 * Initialize thread and process structures.
387 */
388 procinit(); /* set up proc zone */
389 threadinit(); /* set up UMA zones */
390
391 /*
392 * Initialise scheduler resources.
393 * Add scheduler specific parts to proc, thread as needed.
394 */
395 schedinit(); /* scheduler gets its house in order */
396 /*
397 * Initialize sleep queue hash table
398 */
399 sleepinit();
400
401 /*
402 * additional VM structures
403 */
404 vm_init2();
405
406 /*
407 * Create process 0 (the swapper).
408 */
409 LIST_INSERT_HEAD(&allproc, p, p_list);
410 LIST_INSERT_HEAD(PIDHASH(0), p, p_hash);
411 mtx_init(&pgrp0.pg_mtx, "process group", NULL, MTX_DEF | MTX_DUPOK);
412 p->p_pgrp = &pgrp0;
413 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash);
414 LIST_INIT(&pgrp0.pg_members);
415 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist);
416
417 pgrp0.pg_session = &session0;
418 mtx_init(&session0.s_mtx, "session", NULL, MTX_DEF);
419 refcount_init(&session0.s_count, 1);
420 session0.s_leader = p;
421
422 p->p_sysent = &null_sysvec;
423 p->p_flag = P_SYSTEM | P_INMEM;
424 p->p_state = PRS_NORMAL;
425 knlist_init_mtx(&p->p_klist, &p->p_mtx);
426 STAILQ_INIT(&p->p_ktr);
427 p->p_nice = NZERO;
428 td->td_tid = PID_MAX + 1;
429 td->td_state = TDS_RUNNING;
430 td->td_pri_class = PRI_TIMESHARE;
431 td->td_user_pri = PUSER;
432 td->td_base_user_pri = PUSER;
433 td->td_priority = PVM;
434 td->td_base_pri = PUSER;
435 td->td_oncpu = 0;
436 td->td_flags = TDF_INMEM|TDP_KTHREAD;
437 td->td_cpuset = cpuset_thread0();
438 prison0.pr_cpuset = cpuset_ref(td->td_cpuset);
439 p->p_peers = 0;
440 p->p_leader = p;
441
442
443 strncpy(p->p_comm, "kernel", sizeof (p->p_comm));
444 strncpy(td->td_name, "swapper", sizeof (td->td_name));
445
446 callout_init(&p->p_itcallout, CALLOUT_MPSAFE);
447 callout_init_mtx(&p->p_limco, &p->p_mtx, 0);
448 callout_init(&td->td_slpcallout, CALLOUT_MPSAFE);
449
450 /* Create credentials. */
451 p->p_ucred = crget();
452 p->p_ucred->cr_ngroups = 1; /* group 0 */
453 p->p_ucred->cr_uidinfo = uifind(0);
454 p->p_ucred->cr_ruidinfo = uifind(0);
455 p->p_ucred->cr_prison = &prison0;
456 #ifdef AUDIT
457 audit_cred_kproc0(p->p_ucred);
458 #endif
459 #ifdef MAC
460 mac_cred_create_swapper(p->p_ucred);
461 #endif
462 td->td_ucred = crhold(p->p_ucred);
463
464 /* Create sigacts. */
465 p->p_sigacts = sigacts_alloc();
466
467 /* Initialize signal state for process 0. */
468 siginit(&proc0);
469
470 /* Create the file descriptor table. */
471 p->p_fd = fdinit(NULL);
472 p->p_fdtol = NULL;
473
474 /* Create the limits structures. */
475 p->p_limit = lim_alloc();
476 for (i = 0; i < RLIM_NLIMITS; i++)
477 p->p_limit->pl_rlimit[i].rlim_cur =
478 p->p_limit->pl_rlimit[i].rlim_max = RLIM_INFINITY;
479 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_cur =
480 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles;
481 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_cur =
482 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc;
483 i = ptoa(cnt.v_free_count);
484 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_max = i;
485 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_max = i;
486 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = i / 3;
487 p->p_cpulimit = RLIM_INFINITY;
488
489 p->p_stats = pstats_alloc();
490
491 /* Allocate a prototype map so we have something to fork. */
492 pmap_pinit0(vmspace_pmap(&vmspace0));
493 p->p_vmspace = &vmspace0;
494 vmspace0.vm_refcnt = 1;
495
496 /*
497 * proc0 is not expected to enter usermode, so there is no special
498 * handling for sv_minuser here, like is done for exec_new_vmspace().
499 */
500 vm_map_init(&vmspace0.vm_map, p->p_sysent->sv_minuser,
501 p->p_sysent->sv_maxuser);
502 vmspace0.vm_map.pmap = vmspace_pmap(&vmspace0);
503
504 /*-
505 * call the init and ctor for the new thread and proc
506 * we wait to do this until all other structures
507 * are fairly sane.
508 */
509 EVENTHANDLER_INVOKE(process_init, p);
510 EVENTHANDLER_INVOKE(thread_init, td);
511 EVENTHANDLER_INVOKE(process_ctor, p);
512 EVENTHANDLER_INVOKE(thread_ctor, td);
513
514 /*
515 * Charge root for one process.
516 */
517 (void)chgproccnt(p->p_ucred->cr_ruidinfo, 1, 0);
518 }
519 SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL);
520
521 /* ARGSUSED*/
522 static void
523 proc0_post(void *dummy __unused)
524 {
525 struct timespec ts;
526 struct proc *p;
527 struct rusage ru;
528 struct thread *td;
529
530 /*
531 * Now we can look at the time, having had a chance to verify the
532 * time from the filesystem. Pretend that proc0 started now.
533 */
534 sx_slock(&allproc_lock);
535 FOREACH_PROC_IN_SYSTEM(p) {
536 microuptime(&p->p_stats->p_start);
537 PROC_SLOCK(p);
538 rufetch(p, &ru); /* Clears thread stats */
539 PROC_SUNLOCK(p);
540 p->p_rux.rux_runtime = 0;
541 p->p_rux.rux_uticks = 0;
542 p->p_rux.rux_sticks = 0;
543 p->p_rux.rux_iticks = 0;
544 FOREACH_THREAD_IN_PROC(p, td) {
545 td->td_runtime = 0;
546 }
547 }
548 sx_sunlock(&allproc_lock);
549 PCPU_SET(switchtime, cpu_ticks());
550 PCPU_SET(switchticks, ticks);
551
552 /*
553 * Give the ``random'' number generator a thump.
554 */
555 nanotime(&ts);
556 srandom(ts.tv_sec ^ ts.tv_nsec);
557 }
558 SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL);
559
560 static void
561 random_init(void *dummy __unused)
562 {
563
564 /*
565 * After CPU has been started we have some randomness on most
566 * platforms via get_cyclecount(). For platforms that don't
567 * we will reseed random(9) in proc0_post() as well.
568 */
569 srandom(get_cyclecount());
570 }
571 SYSINIT(random, SI_SUB_RANDOM, SI_ORDER_FIRST, random_init, NULL);
572
573 /*
574 ***************************************************************************
575 ****
576 **** The following SYSINIT's and glue code should be moved to the
577 **** respective files on a per subsystem basis.
578 ****
579 ***************************************************************************
580 */
581
582
583 /*
584 ***************************************************************************
585 ****
586 **** The following code probably belongs in another file, like
587 **** kern/init_init.c.
588 ****
589 ***************************************************************************
590 */
591
592 /*
593 * List of paths to try when searching for "init".
594 */
595 static char init_path[MAXPATHLEN] =
596 #ifdef INIT_PATH
597 __XSTRING(INIT_PATH);
598 #else
599 "/sbin/init:/sbin/oinit:/sbin/init.bak:/rescue/init:/stand/sysinstall";
600 #endif
601 SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0,
602 "Path used to search the init process");
603
604 /*
605 * Shutdown timeout of init(8).
606 * Unused within kernel, but used to control init(8), hence do not remove.
607 */
608 #ifndef INIT_SHUTDOWN_TIMEOUT
609 #define INIT_SHUTDOWN_TIMEOUT 120
610 #endif
611 static int init_shutdown_timeout = INIT_SHUTDOWN_TIMEOUT;
612 SYSCTL_INT(_kern, OID_AUTO, init_shutdown_timeout,
613 CTLFLAG_RW, &init_shutdown_timeout, 0, "");
614
615 /*
616 * Start the initial user process; try exec'ing each pathname in init_path.
617 * The program is invoked with one argument containing the boot flags.
618 */
619 static void
620 start_init(void *dummy)
621 {
622 vm_offset_t addr;
623 struct execve_args args;
624 int options, error;
625 char *var, *path, *next, *s;
626 char *ucp, **uap, *arg0, *arg1;
627 struct thread *td;
628 struct proc *p;
629
630 mtx_lock(&Giant);
631
632 GIANT_REQUIRED;
633
634 td = curthread;
635 p = td->td_proc;
636
637 vfs_mountroot();
638
639 /*
640 * Need just enough stack to hold the faked-up "execve()" arguments.
641 */
642 addr = p->p_sysent->sv_usrstack - PAGE_SIZE;
643 if (vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &addr, PAGE_SIZE,
644 FALSE, VM_PROT_ALL, VM_PROT_ALL, 0) != 0)
645 panic("init: couldn't allocate argument space");
646 p->p_vmspace->vm_maxsaddr = (caddr_t)addr;
647 p->p_vmspace->vm_ssize = 1;
648
649 if ((var = getenv("init_path")) != NULL) {
650 strlcpy(init_path, var, sizeof(init_path));
651 freeenv(var);
652 }
653
654 for (path = init_path; *path != '\0'; path = next) {
655 while (*path == ':')
656 path++;
657 if (*path == '\0')
658 break;
659 for (next = path; *next != '\0' && *next != ':'; next++)
660 /* nothing */ ;
661 if (bootverbose)
662 printf("start_init: trying %.*s\n", (int)(next - path),
663 path);
664
665 /*
666 * Move out the boot flag argument.
667 */
668 options = 0;
669 ucp = (char *)p->p_sysent->sv_usrstack;
670 (void)subyte(--ucp, 0); /* trailing zero */
671 if (boothowto & RB_SINGLE) {
672 (void)subyte(--ucp, 's');
673 options = 1;
674 }
675 #ifdef notyet
676 if (boothowto & RB_FASTBOOT) {
677 (void)subyte(--ucp, 'f');
678 options = 1;
679 }
680 #endif
681
682 #ifdef BOOTCDROM
683 (void)subyte(--ucp, 'C');
684 options = 1;
685 #endif
686
687 if (options == 0)
688 (void)subyte(--ucp, '-');
689 (void)subyte(--ucp, '-'); /* leading hyphen */
690 arg1 = ucp;
691
692 /*
693 * Move out the file name (also arg 0).
694 */
695 (void)subyte(--ucp, 0);
696 for (s = next - 1; s >= path; s--)
697 (void)subyte(--ucp, *s);
698 arg0 = ucp;
699
700 /*
701 * Move out the arg pointers.
702 */
703 uap = (char **)((intptr_t)ucp & ~(sizeof(intptr_t)-1));
704 (void)suword((caddr_t)--uap, (long)0); /* terminator */
705 (void)suword((caddr_t)--uap, (long)(intptr_t)arg1);
706 (void)suword((caddr_t)--uap, (long)(intptr_t)arg0);
707
708 /*
709 * Point at the arguments.
710 */
711 args.fname = arg0;
712 args.argv = uap;
713 args.envv = NULL;
714
715 /*
716 * Now try to exec the program. If can't for any reason
717 * other than it doesn't exist, complain.
718 *
719 * Otherwise, return via fork_trampoline() all the way
720 * to user mode as init!
721 */
722 if ((error = execve(td, &args)) == 0) {
723 mtx_unlock(&Giant);
724 return;
725 }
726 if (error != ENOENT)
727 printf("exec %.*s: error %d\n", (int)(next - path),
728 path, error);
729 }
730 printf("init: not found in path %s\n", init_path);
731 panic("no init");
732 }
733
734 /*
735 * Like kproc_create(), but runs in it's own address space.
736 * We do this early to reserve pid 1.
737 *
738 * Note special case - do not make it runnable yet. Other work
739 * in progress will change this more.
740 */
741 static void
742 create_init(const void *udata __unused)
743 {
744 struct ucred *newcred, *oldcred;
745 int error;
746
747 error = fork1(&thread0, RFFDG | RFPROC | RFSTOPPED, 0, &initproc);
748 if (error)
749 panic("cannot fork init: %d\n", error);
750 KASSERT(initproc->p_pid == 1, ("create_init: initproc->p_pid != 1"));
751 /* divorce init's credentials from the kernel's */
752 newcred = crget();
753 PROC_LOCK(initproc);
754 initproc->p_flag |= P_SYSTEM | P_INMEM;
755 oldcred = initproc->p_ucred;
756 crcopy(newcred, oldcred);
757 #ifdef MAC
758 mac_cred_create_init(newcred);
759 #endif
760 #ifdef AUDIT
761 audit_cred_proc1(newcred);
762 #endif
763 initproc->p_ucred = newcred;
764 PROC_UNLOCK(initproc);
765 crfree(oldcred);
766 cred_update_thread(FIRST_THREAD_IN_PROC(initproc));
767 cpu_set_fork_handler(FIRST_THREAD_IN_PROC(initproc), start_init, NULL);
768 }
769 SYSINIT(init, SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL);
770
771 /*
772 * Make it runnable now.
773 */
774 static void
775 kick_init(const void *udata __unused)
776 {
777 struct thread *td;
778
779 td = FIRST_THREAD_IN_PROC(initproc);
780 thread_lock(td);
781 TD_SET_CAN_RUN(td);
782 sched_add(td, SRQ_BORING);
783 thread_unlock(td);
784 }
785 SYSINIT(kickinit, SI_SUB_KTHREAD_INIT, SI_ORDER_FIRST, kick_init, NULL);
Cache object: 3901ef9d4e95e90f622ef2fa743af29b
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