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("$FreeBSD$");
46
47 #include "opt_ddb.h"
48 #include "opt_init_path.h"
49 #include "opt_mac.h"
50
51 #include <sys/param.h>
52 #include <sys/kernel.h>
53 #include <sys/exec.h>
54 #include <sys/file.h>
55 #include <sys/filedesc.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 (boothowto & RB_VERBOSE)
182 bootverbose++;
183
184 if (sysinit == NULL) {
185 sysinit = SET_BEGIN(sysinit_set);
186 sysinit_end = SET_LIMIT(sysinit_set);
187 }
188
189 restart:
190 /*
191 * Perform a bubble sort of the system initialization objects by
192 * their subsystem (primary key) and order (secondary key).
193 */
194 for (sipp = sysinit; sipp < sysinit_end; sipp++) {
195 for (xipp = sipp + 1; xipp < sysinit_end; xipp++) {
196 if ((*sipp)->subsystem < (*xipp)->subsystem ||
197 ((*sipp)->subsystem == (*xipp)->subsystem &&
198 (*sipp)->order <= (*xipp)->order))
199 continue; /* skip*/
200 save = *sipp;
201 *sipp = *xipp;
202 *xipp = save;
203 }
204 }
205
206 #if defined(VERBOSE_SYSINIT)
207 last = SI_SUB_COPYRIGHT;
208 verbose = 0;
209 #if !defined(DDB)
210 printf("VERBOSE_SYSINIT: DDB not enabled, symbol lookups disabled.\n");
211 #endif
212 #endif
213
214 /*
215 * Traverse the (now) ordered list of system initialization tasks.
216 * Perform each task, and continue on to the next task.
217 *
218 * The last item on the list is expected to be the scheduler,
219 * which will not return.
220 */
221 for (sipp = sysinit; sipp < sysinit_end; sipp++) {
222
223 if ((*sipp)->subsystem == SI_SUB_DUMMY)
224 continue; /* skip dummy task(s)*/
225
226 if ((*sipp)->subsystem == SI_SUB_DONE)
227 continue;
228
229 #if defined(VERBOSE_SYSINIT)
230 if ((*sipp)->subsystem > last) {
231 verbose = 1;
232 last = (*sipp)->subsystem;
233 printf("subsystem %x\n", last);
234 }
235 if (verbose) {
236 #if defined(DDB)
237 const char *name;
238 c_db_sym_t sym;
239 db_expr_t offset;
240
241 sym = db_search_symbol((vm_offset_t)(*sipp)->func,
242 DB_STGY_PROC, &offset);
243 db_symbol_values(sym, &name, NULL);
244 if (name != NULL)
245 printf(" %s(%p)... ", name, (*sipp)->udata);
246 else
247 #endif
248 printf(" %p(%p)... ", (*sipp)->func,
249 (*sipp)->udata);
250 }
251 #endif
252
253 /* Call function */
254 (*((*sipp)->func))((*sipp)->udata);
255
256 #if defined(VERBOSE_SYSINIT)
257 if (verbose)
258 printf("done.\n");
259 #endif
260
261 /* Check off the one we're just done */
262 (*sipp)->subsystem = SI_SUB_DONE;
263
264 /* Check if we've installed more sysinit items via KLD */
265 if (newsysinit != NULL) {
266 if (sysinit != SET_BEGIN(sysinit_set))
267 free(sysinit, M_TEMP);
268 sysinit = newsysinit;
269 sysinit_end = newsysinit_end;
270 newsysinit = NULL;
271 newsysinit_end = NULL;
272 goto restart;
273 }
274 }
275
276 panic("Shouldn't get here!");
277 /* NOTREACHED*/
278 }
279
280
281 /*
282 ***************************************************************************
283 ****
284 **** The following SYSINIT's belong elsewhere, but have not yet
285 **** been moved.
286 ****
287 ***************************************************************************
288 */
289 static void
290 print_caddr_t(void *data)
291 {
292 printf("%s", (char *)data);
293 }
294
295 static void
296 print_version(void *data __unused)
297 {
298 int len;
299
300 /* Strip a trailing newline from version. */
301 len = strlen(version);
302 while (len > 0 && version[len - 1] == '\n')
303 len--;
304 printf("%.*s %s\n", len, version, machine);
305 }
306
307 SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t,
308 copyright);
309 SYSINIT(trademark, SI_SUB_COPYRIGHT, SI_ORDER_SECOND, print_caddr_t,
310 trademark);
311 SYSINIT(version, SI_SUB_COPYRIGHT, SI_ORDER_THIRD, print_version, NULL);
312
313 #ifdef WITNESS
314 static char wit_warn[] =
315 "WARNING: WITNESS option enabled, expect reduced performance.\n";
316 SYSINIT(witwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 1,
317 print_caddr_t, wit_warn);
318 SYSINIT(witwarn2, SI_SUB_RUN_SCHEDULER, SI_ORDER_THIRD + 1,
319 print_caddr_t, wit_warn);
320 #endif
321
322 #ifdef DIAGNOSTIC
323 static char diag_warn[] =
324 "WARNING: DIAGNOSTIC option enabled, expect reduced performance.\n";
325 SYSINIT(diagwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 2,
326 print_caddr_t, diag_warn);
327 SYSINIT(diagwarn2, SI_SUB_RUN_SCHEDULER, SI_ORDER_THIRD + 2,
328 print_caddr_t, diag_warn);
329 #endif
330
331 struct sysentvec null_sysvec = {
332 .sv_size = 0,
333 .sv_table = NULL,
334 .sv_mask = 0,
335 .sv_sigsize = 0,
336 .sv_sigtbl = NULL,
337 .sv_errsize = 0,
338 .sv_errtbl = NULL,
339 .sv_transtrap = NULL,
340 .sv_fixup = NULL,
341 .sv_sendsig = NULL,
342 .sv_sigcode = NULL,
343 .sv_szsigcode = NULL,
344 .sv_prepsyscall = NULL,
345 .sv_name = "null",
346 .sv_coredump = NULL,
347 .sv_imgact_try = NULL,
348 .sv_minsigstksz = 0,
349 .sv_pagesize = PAGE_SIZE,
350 .sv_minuser = VM_MIN_ADDRESS,
351 .sv_maxuser = VM_MAXUSER_ADDRESS,
352 .sv_usrstack = USRSTACK,
353 .sv_psstrings = PS_STRINGS,
354 .sv_stackprot = VM_PROT_ALL,
355 .sv_copyout_strings = NULL,
356 .sv_setregs = NULL,
357 .sv_fixlimit = NULL,
358 .sv_maxssiz = NULL
359 };
360
361 /*
362 ***************************************************************************
363 ****
364 **** The two following SYSINIT's are proc0 specific glue code. I am not
365 **** convinced that they can not be safely combined, but their order of
366 **** operation has been maintained as the same as the original init_main.c
367 **** for right now.
368 ****
369 **** These probably belong in init_proc.c or kern_proc.c, since they
370 **** deal with proc0 (the fork template process).
371 ****
372 ***************************************************************************
373 */
374 /* ARGSUSED*/
375 static void
376 proc0_init(void *dummy __unused)
377 {
378 struct proc *p;
379 unsigned i;
380 struct thread *td;
381
382 GIANT_REQUIRED;
383 p = &proc0;
384 td = &thread0;
385
386 /*
387 * Initialize magic number and osrel.
388 */
389 p->p_magic = P_MAGIC;
390 p->p_osrel = osreldate;
391
392 /*
393 * Initialize thread and process structures.
394 */
395 procinit(); /* set up proc zone */
396 threadinit(); /* set up UMA zones */
397
398 /*
399 * Initialise scheduler resources.
400 * Add scheduler specific parts to proc, thread as needed.
401 */
402 schedinit(); /* scheduler gets its house in order */
403 /*
404 * Initialize sleep queue hash table
405 */
406 sleepinit();
407
408 /*
409 * additional VM structures
410 */
411 vm_init2();
412
413 /*
414 * Create process 0 (the swapper).
415 */
416 LIST_INSERT_HEAD(&allproc, p, p_list);
417 LIST_INSERT_HEAD(PIDHASH(0), p, p_hash);
418 mtx_init(&pgrp0.pg_mtx, "process group", NULL, MTX_DEF | MTX_DUPOK);
419 p->p_pgrp = &pgrp0;
420 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash);
421 LIST_INIT(&pgrp0.pg_members);
422 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist);
423
424 pgrp0.pg_session = &session0;
425 mtx_init(&session0.s_mtx, "session", NULL, MTX_DEF);
426 session0.s_count = 1;
427 session0.s_leader = p;
428
429 p->p_sysent = &null_sysvec;
430 p->p_flag = P_SYSTEM | P_INMEM;
431 p->p_state = PRS_NORMAL;
432 knlist_init_mtx(&p->p_klist, &p->p_mtx);
433 STAILQ_INIT(&p->p_ktr);
434 p->p_nice = NZERO;
435 td->td_tid = PID_MAX + 1;
436 td->td_state = TDS_RUNNING;
437 td->td_pri_class = PRI_TIMESHARE;
438 td->td_user_pri = PUSER;
439 td->td_base_user_pri = PUSER;
440 td->td_priority = PVM;
441 td->td_base_pri = PVM;
442 td->td_oncpu = 0;
443 td->td_flags = TDF_INMEM;
444 td->td_cpuset = cpuset_thread0();
445 p->p_peers = 0;
446 p->p_leader = p;
447
448
449 bcopy("swapper", p->p_comm, sizeof ("swapper"));
450
451 callout_init(&p->p_itcallout, CALLOUT_MPSAFE);
452 callout_init_mtx(&p->p_limco, &p->p_mtx, 0);
453 callout_init(&td->td_slpcallout, CALLOUT_MPSAFE);
454
455 /* Create credentials. */
456 p->p_ucred = crget();
457 p->p_ucred->cr_ngroups = 1; /* group 0 */
458 p->p_ucred->cr_uidinfo = uifind(0);
459 p->p_ucred->cr_ruidinfo = uifind(0);
460 p->p_ucred->cr_prison = NULL; /* Don't jail it. */
461 #ifdef AUDIT
462 audit_cred_kproc0(p->p_ucred);
463 #endif
464 #ifdef MAC
465 mac_create_proc0(p->p_ucred);
466 #endif
467 td->td_ucred = crhold(p->p_ucred);
468
469 /* Create sigacts. */
470 p->p_sigacts = sigacts_alloc();
471
472 /* Initialize signal state for process 0. */
473 siginit(&proc0);
474
475 /* Create the file descriptor table. */
476 p->p_fd = fdinit(NULL);
477 p->p_fdtol = NULL;
478
479 /* Create the limits structures. */
480 p->p_limit = lim_alloc();
481 for (i = 0; i < RLIM_NLIMITS; i++)
482 p->p_limit->pl_rlimit[i].rlim_cur =
483 p->p_limit->pl_rlimit[i].rlim_max = RLIM_INFINITY;
484 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_cur =
485 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles;
486 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_cur =
487 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc;
488 i = ptoa(cnt.v_free_count);
489 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_max = i;
490 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_max = i;
491 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = i / 3;
492 p->p_cpulimit = RLIM_INFINITY;
493
494 p->p_stats = pstats_alloc();
495
496 /* Allocate a prototype map so we have something to fork. */
497 pmap_pinit0(vmspace_pmap(&vmspace0));
498 p->p_vmspace = &vmspace0;
499 vmspace0.vm_refcnt = 1;
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 * call the init and ctor for the new thread and proc
505 * we wait to do this until all other structures
506 * are fairly sane.
507 */
508 EVENTHANDLER_INVOKE(process_init, p);
509 EVENTHANDLER_INVOKE(thread_init, td);
510 EVENTHANDLER_INVOKE(process_ctor, p);
511 EVENTHANDLER_INVOKE(thread_ctor, td);
512
513 /*
514 * Charge root for one process.
515 */
516 (void)chgproccnt(p->p_ucred->cr_ruidinfo, 1, 0);
517 }
518 SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL);
519
520 /* ARGSUSED*/
521 static void
522 proc0_post(void *dummy __unused)
523 {
524 struct timespec ts;
525 struct proc *p;
526 struct rusage ru;
527 struct thread *td;
528
529 /*
530 * Now we can look at the time, having had a chance to verify the
531 * time from the filesystem. Pretend that proc0 started now.
532 */
533 sx_slock(&allproc_lock);
534 FOREACH_PROC_IN_SYSTEM(p) {
535 microuptime(&p->p_stats->p_start);
536 PROC_SLOCK(p);
537 rufetch(p, &ru); /* Clears thread stats */
538 PROC_SUNLOCK(p);
539 p->p_rux.rux_runtime = 0;
540 p->p_rux.rux_uticks = 0;
541 p->p_rux.rux_sticks = 0;
542 p->p_rux.rux_iticks = 0;
543 FOREACH_THREAD_IN_PROC(p, td) {
544 td->td_runtime = 0;
545 }
546 }
547 sx_sunlock(&allproc_lock);
548 PCPU_SET(switchtime, cpu_ticks());
549 PCPU_SET(switchticks, ticks);
550
551 /*
552 * Give the ``random'' number generator a thump.
553 */
554 nanotime(&ts);
555 srandom(ts.tv_sec ^ ts.tv_nsec);
556 }
557 SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL);
558
559 /*
560 ***************************************************************************
561 ****
562 **** The following SYSINIT's and glue code should be moved to the
563 **** respective files on a per subsystem basis.
564 ****
565 ***************************************************************************
566 */
567
568
569 /*
570 ***************************************************************************
571 ****
572 **** The following code probably belongs in another file, like
573 **** kern/init_init.c.
574 ****
575 ***************************************************************************
576 */
577
578 /*
579 * List of paths to try when searching for "init".
580 */
581 static char init_path[MAXPATHLEN] =
582 #ifdef INIT_PATH
583 __XSTRING(INIT_PATH);
584 #else
585 "/sbin/init:/sbin/oinit:/sbin/init.bak:/rescue/init:/stand/sysinstall";
586 #endif
587 SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0,
588 "Path used to search the init process");
589
590 /*
591 * Shutdown timeout of init(8).
592 * Unused within kernel, but used to control init(8), hence do not remove.
593 */
594 #ifndef INIT_SHUTDOWN_TIMEOUT
595 #define INIT_SHUTDOWN_TIMEOUT 120
596 #endif
597 static int init_shutdown_timeout = INIT_SHUTDOWN_TIMEOUT;
598 SYSCTL_INT(_kern, OID_AUTO, init_shutdown_timeout,
599 CTLFLAG_RW, &init_shutdown_timeout, 0, "");
600
601 /*
602 * Start the initial user process; try exec'ing each pathname in init_path.
603 * The program is invoked with one argument containing the boot flags.
604 */
605 static void
606 start_init(void *dummy)
607 {
608 vm_offset_t addr;
609 struct execve_args args;
610 int options, error;
611 char *var, *path, *next, *s;
612 char *ucp, **uap, *arg0, *arg1;
613 struct thread *td;
614 struct proc *p;
615
616 mtx_lock(&Giant);
617
618 GIANT_REQUIRED;
619
620 td = curthread;
621 p = td->td_proc;
622
623 vfs_mountroot();
624
625 /*
626 * Need just enough stack to hold the faked-up "execve()" arguments.
627 */
628 addr = p->p_sysent->sv_usrstack - PAGE_SIZE;
629 if (vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &addr, PAGE_SIZE,
630 FALSE, VM_PROT_ALL, VM_PROT_ALL, 0) != 0)
631 panic("init: couldn't allocate argument space");
632 p->p_vmspace->vm_maxsaddr = (caddr_t)addr;
633 p->p_vmspace->vm_ssize = 1;
634
635 if ((var = getenv("init_path")) != NULL) {
636 strlcpy(init_path, var, sizeof(init_path));
637 freeenv(var);
638 }
639
640 for (path = init_path; *path != '\0'; path = next) {
641 while (*path == ':')
642 path++;
643 if (*path == '\0')
644 break;
645 for (next = path; *next != '\0' && *next != ':'; next++)
646 /* nothing */ ;
647 if (bootverbose)
648 printf("start_init: trying %.*s\n", (int)(next - path),
649 path);
650
651 /*
652 * Move out the boot flag argument.
653 */
654 options = 0;
655 ucp = (char *)p->p_sysent->sv_usrstack;
656 (void)subyte(--ucp, 0); /* trailing zero */
657 if (boothowto & RB_SINGLE) {
658 (void)subyte(--ucp, 's');
659 options = 1;
660 }
661 #ifdef notyet
662 if (boothowto & RB_FASTBOOT) {
663 (void)subyte(--ucp, 'f');
664 options = 1;
665 }
666 #endif
667
668 #ifdef BOOTCDROM
669 (void)subyte(--ucp, 'C');
670 options = 1;
671 #endif
672
673 if (options == 0)
674 (void)subyte(--ucp, '-');
675 (void)subyte(--ucp, '-'); /* leading hyphen */
676 arg1 = ucp;
677
678 /*
679 * Move out the file name (also arg 0).
680 */
681 (void)subyte(--ucp, 0);
682 for (s = next - 1; s >= path; s--)
683 (void)subyte(--ucp, *s);
684 arg0 = ucp;
685
686 /*
687 * Move out the arg pointers.
688 */
689 uap = (char **)((intptr_t)ucp & ~(sizeof(intptr_t)-1));
690 (void)suword((caddr_t)--uap, (long)0); /* terminator */
691 (void)suword((caddr_t)--uap, (long)(intptr_t)arg1);
692 (void)suword((caddr_t)--uap, (long)(intptr_t)arg0);
693
694 /*
695 * Point at the arguments.
696 */
697 args.fname = arg0;
698 args.argv = uap;
699 args.envv = NULL;
700
701 /*
702 * Now try to exec the program. If can't for any reason
703 * other than it doesn't exist, complain.
704 *
705 * Otherwise, return via fork_trampoline() all the way
706 * to user mode as init!
707 */
708 if ((error = execve(td, &args)) == 0) {
709 mtx_unlock(&Giant);
710 return;
711 }
712 if (error != ENOENT)
713 printf("exec %.*s: error %d\n", (int)(next - path),
714 path, error);
715 }
716 printf("init: not found in path %s\n", init_path);
717 panic("no init");
718 }
719
720 /*
721 * Like kthread_create(), but runs in it's own address space.
722 * We do this early to reserve pid 1.
723 *
724 * Note special case - do not make it runnable yet. Other work
725 * in progress will change this more.
726 */
727 static void
728 create_init(const void *udata __unused)
729 {
730 struct ucred *newcred, *oldcred;
731 int error;
732
733 error = fork1(&thread0, RFFDG | RFPROC | RFSTOPPED, 0, &initproc);
734 if (error)
735 panic("cannot fork init: %d\n", error);
736 KASSERT(initproc->p_pid == 1, ("create_init: initproc->p_pid != 1"));
737 /* divorce init's credentials from the kernel's */
738 newcred = crget();
739 PROC_LOCK(initproc);
740 initproc->p_flag |= P_SYSTEM | P_INMEM;
741 oldcred = initproc->p_ucred;
742 crcopy(newcred, oldcred);
743 #ifdef MAC
744 mac_create_proc1(newcred);
745 #endif
746 #ifdef AUDIT
747 audit_cred_proc1(newcred);
748 #endif
749 initproc->p_ucred = newcred;
750 PROC_UNLOCK(initproc);
751 crfree(oldcred);
752 cred_update_thread(FIRST_THREAD_IN_PROC(initproc));
753 cpu_set_fork_handler(FIRST_THREAD_IN_PROC(initproc), start_init, NULL);
754 }
755 SYSINIT(init, SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL);
756
757 /*
758 * Make it runnable now.
759 */
760 static void
761 kick_init(const void *udata __unused)
762 {
763 struct thread *td;
764
765 td = FIRST_THREAD_IN_PROC(initproc);
766 thread_lock(td);
767 TD_SET_CAN_RUN(td);
768 sched_add(td, SRQ_BORING);
769 thread_unlock(td);
770 }
771 SYSINIT(kickinit, SI_SUB_KTHREAD_INIT, SI_ORDER_FIRST, kick_init, NULL);
Cache object: 02805f792dd7116f7b9a01ed4cc9a95a
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