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/9.2/sys/kern/init_main.c 247874 2013-03-06 09:12:38Z avg $");
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 #if defined (DDB) && defined(VERBOSE_SYSINIT)
162 static const char *
163 symbol_name(vm_offset_t va, db_strategy_t strategy)
164 {
165 const char *name;
166 c_db_sym_t sym;
167 db_expr_t offset;
168
169 if (va == 0)
170 return (NULL);
171 sym = db_search_symbol(va, strategy, &offset);
172 if (offset != 0)
173 return (NULL);
174 db_symbol_values(sym, &name, NULL);
175 return (name);
176 }
177 #endif
178
179 /*
180 * System startup; initialize the world, create process 0, mount root
181 * filesystem, and fork to create init and pagedaemon. Most of the
182 * hard work is done in the lower-level initialization routines including
183 * startup(), which does memory initialization and autoconfiguration.
184 *
185 * This allows simple addition of new kernel subsystems that require
186 * boot time initialization. It also allows substitution of subsystem
187 * (for instance, a scheduler, kernel profiler, or VM system) by object
188 * module. Finally, it allows for optional "kernel threads".
189 */
190 void
191 mi_startup(void)
192 {
193
194 register struct sysinit **sipp; /* system initialization*/
195 register struct sysinit **xipp; /* interior loop of sort*/
196 register struct sysinit *save; /* bubble*/
197
198 #if defined(VERBOSE_SYSINIT)
199 int last;
200 int verbose;
201 #endif
202
203 if (boothowto & RB_VERBOSE)
204 bootverbose++;
205
206 if (sysinit == NULL) {
207 sysinit = SET_BEGIN(sysinit_set);
208 sysinit_end = SET_LIMIT(sysinit_set);
209 }
210
211 restart:
212 /*
213 * Perform a bubble sort of the system initialization objects by
214 * their subsystem (primary key) and order (secondary key).
215 */
216 for (sipp = sysinit; sipp < sysinit_end; sipp++) {
217 for (xipp = sipp + 1; xipp < sysinit_end; xipp++) {
218 if ((*sipp)->subsystem < (*xipp)->subsystem ||
219 ((*sipp)->subsystem == (*xipp)->subsystem &&
220 (*sipp)->order <= (*xipp)->order))
221 continue; /* skip*/
222 save = *sipp;
223 *sipp = *xipp;
224 *xipp = save;
225 }
226 }
227
228 #if defined(VERBOSE_SYSINIT)
229 last = SI_SUB_COPYRIGHT;
230 verbose = 0;
231 #if !defined(DDB)
232 printf("VERBOSE_SYSINIT: DDB not enabled, symbol lookups disabled.\n");
233 #endif
234 #endif
235
236 /*
237 * Traverse the (now) ordered list of system initialization tasks.
238 * Perform each task, and continue on to the next task.
239 *
240 * The last item on the list is expected to be the scheduler,
241 * which will not return.
242 */
243 for (sipp = sysinit; sipp < sysinit_end; sipp++) {
244
245 if ((*sipp)->subsystem == SI_SUB_DUMMY)
246 continue; /* skip dummy task(s)*/
247
248 if ((*sipp)->subsystem == SI_SUB_DONE)
249 continue;
250
251 #if defined(VERBOSE_SYSINIT)
252 if ((*sipp)->subsystem > last) {
253 verbose = 1;
254 last = (*sipp)->subsystem;
255 printf("subsystem %x\n", last);
256 }
257 if (verbose) {
258 #if defined(DDB)
259 const char *func, *data;
260
261 func = symbol_name((vm_offset_t)(*sipp)->func,
262 DB_STGY_PROC);
263 data = symbol_name((vm_offset_t)(*sipp)->udata,
264 DB_STGY_ANY);
265 if (func != NULL && data != NULL)
266 printf(" %s(&%s)... ", func, data);
267 else if (func != NULL)
268 printf(" %s(%p)... ", func, (*sipp)->udata);
269 else
270 #endif
271 printf(" %p(%p)... ", (*sipp)->func,
272 (*sipp)->udata);
273 }
274 #endif
275
276 /* Call function */
277 (*((*sipp)->func))((*sipp)->udata);
278
279 #if defined(VERBOSE_SYSINIT)
280 if (verbose)
281 printf("done.\n");
282 #endif
283
284 /* Check off the one we're just done */
285 (*sipp)->subsystem = SI_SUB_DONE;
286
287 /* Check if we've installed more sysinit items via KLD */
288 if (newsysinit != NULL) {
289 if (sysinit != SET_BEGIN(sysinit_set))
290 free(sysinit, M_TEMP);
291 sysinit = newsysinit;
292 sysinit_end = newsysinit_end;
293 newsysinit = NULL;
294 newsysinit_end = NULL;
295 goto restart;
296 }
297 }
298
299 panic("Shouldn't get here!");
300 /* NOTREACHED*/
301 }
302
303
304 /*
305 ***************************************************************************
306 ****
307 **** The following SYSINIT's belong elsewhere, but have not yet
308 **** been moved.
309 ****
310 ***************************************************************************
311 */
312 static void
313 print_caddr_t(void *data)
314 {
315 printf("%s", (char *)data);
316 }
317
318 static void
319 print_version(void *data __unused)
320 {
321 int len;
322
323 /* Strip a trailing newline from version. */
324 len = strlen(version);
325 while (len > 0 && version[len - 1] == '\n')
326 len--;
327 printf("%.*s %s\n", len, version, machine);
328 printf("%s\n", compiler_version);
329 }
330
331 SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t,
332 copyright);
333 SYSINIT(trademark, SI_SUB_COPYRIGHT, SI_ORDER_SECOND, print_caddr_t,
334 trademark);
335 SYSINIT(version, SI_SUB_COPYRIGHT, SI_ORDER_THIRD, print_version, NULL);
336
337 #ifdef WITNESS
338 static char wit_warn[] =
339 "WARNING: WITNESS option enabled, expect reduced performance.\n";
340 SYSINIT(witwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 1,
341 print_caddr_t, wit_warn);
342 SYSINIT(witwarn2, SI_SUB_RUN_SCHEDULER, SI_ORDER_THIRD + 1,
343 print_caddr_t, wit_warn);
344 #endif
345
346 #ifdef DIAGNOSTIC
347 static char diag_warn[] =
348 "WARNING: DIAGNOSTIC option enabled, expect reduced performance.\n";
349 SYSINIT(diagwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 2,
350 print_caddr_t, diag_warn);
351 SYSINIT(diagwarn2, SI_SUB_RUN_SCHEDULER, SI_ORDER_THIRD + 2,
352 print_caddr_t, diag_warn);
353 #endif
354
355 static int
356 null_fetch_syscall_args(struct thread *td __unused,
357 struct syscall_args *sa __unused)
358 {
359
360 panic("null_fetch_syscall_args");
361 }
362
363 static void
364 null_set_syscall_retval(struct thread *td __unused, int error __unused)
365 {
366
367 panic("null_set_syscall_retval");
368 }
369
370 struct sysentvec null_sysvec = {
371 .sv_size = 0,
372 .sv_table = NULL,
373 .sv_mask = 0,
374 .sv_sigsize = 0,
375 .sv_sigtbl = NULL,
376 .sv_errsize = 0,
377 .sv_errtbl = NULL,
378 .sv_transtrap = NULL,
379 .sv_fixup = NULL,
380 .sv_sendsig = NULL,
381 .sv_sigcode = NULL,
382 .sv_szsigcode = NULL,
383 .sv_prepsyscall = NULL,
384 .sv_name = "null",
385 .sv_coredump = NULL,
386 .sv_imgact_try = NULL,
387 .sv_minsigstksz = 0,
388 .sv_pagesize = PAGE_SIZE,
389 .sv_minuser = VM_MIN_ADDRESS,
390 .sv_maxuser = VM_MAXUSER_ADDRESS,
391 .sv_usrstack = USRSTACK,
392 .sv_psstrings = PS_STRINGS,
393 .sv_stackprot = VM_PROT_ALL,
394 .sv_copyout_strings = NULL,
395 .sv_setregs = NULL,
396 .sv_fixlimit = NULL,
397 .sv_maxssiz = NULL,
398 .sv_flags = 0,
399 .sv_set_syscall_retval = null_set_syscall_retval,
400 .sv_fetch_syscall_args = null_fetch_syscall_args,
401 .sv_syscallnames = NULL,
402 .sv_schedtail = NULL,
403 };
404
405 /*
406 ***************************************************************************
407 ****
408 **** The two following SYSINIT's are proc0 specific glue code. I am not
409 **** convinced that they can not be safely combined, but their order of
410 **** operation has been maintained as the same as the original init_main.c
411 **** for right now.
412 ****
413 **** These probably belong in init_proc.c or kern_proc.c, since they
414 **** deal with proc0 (the fork template process).
415 ****
416 ***************************************************************************
417 */
418 /* ARGSUSED*/
419 static void
420 proc0_init(void *dummy __unused)
421 {
422 struct proc *p;
423 struct thread *td;
424 vm_paddr_t pageablemem;
425 int i;
426
427 GIANT_REQUIRED;
428 p = &proc0;
429 td = &thread0;
430
431 /*
432 * Initialize magic number and osrel.
433 */
434 p->p_magic = P_MAGIC;
435 p->p_osrel = osreldate;
436
437 /*
438 * Initialize thread and process structures.
439 */
440 procinit(); /* set up proc zone */
441 threadinit(); /* set up UMA zones */
442
443 /*
444 * Initialise scheduler resources.
445 * Add scheduler specific parts to proc, thread as needed.
446 */
447 schedinit(); /* scheduler gets its house in order */
448 /*
449 * Initialize sleep queue hash table
450 */
451 sleepinit();
452
453 /*
454 * additional VM structures
455 */
456 vm_init2();
457
458 /*
459 * Create process 0 (the swapper).
460 */
461 LIST_INSERT_HEAD(&allproc, p, p_list);
462 LIST_INSERT_HEAD(PIDHASH(0), p, p_hash);
463 mtx_init(&pgrp0.pg_mtx, "process group", NULL, MTX_DEF | MTX_DUPOK);
464 p->p_pgrp = &pgrp0;
465 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash);
466 LIST_INIT(&pgrp0.pg_members);
467 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist);
468
469 pgrp0.pg_session = &session0;
470 mtx_init(&session0.s_mtx, "session", NULL, MTX_DEF);
471 refcount_init(&session0.s_count, 1);
472 session0.s_leader = p;
473
474 p->p_sysent = &null_sysvec;
475 p->p_flag = P_SYSTEM | P_INMEM;
476 p->p_state = PRS_NORMAL;
477 knlist_init_mtx(&p->p_klist, &p->p_mtx);
478 STAILQ_INIT(&p->p_ktr);
479 p->p_nice = NZERO;
480 /* pid_max cannot be greater than PID_MAX */
481 td->td_tid = PID_MAX + 1;
482 LIST_INSERT_HEAD(TIDHASH(td->td_tid), td, td_hash);
483 td->td_state = TDS_RUNNING;
484 td->td_pri_class = PRI_TIMESHARE;
485 td->td_user_pri = PUSER;
486 td->td_base_user_pri = PUSER;
487 td->td_lend_user_pri = PRI_MAX;
488 td->td_priority = PVM;
489 td->td_base_pri = PVM;
490 td->td_oncpu = 0;
491 td->td_flags = TDF_INMEM|TDP_KTHREAD;
492 td->td_cpuset = cpuset_thread0();
493 prison0.pr_cpuset = cpuset_ref(td->td_cpuset);
494 p->p_peers = 0;
495 p->p_leader = p;
496
497
498 strncpy(p->p_comm, "kernel", sizeof (p->p_comm));
499 strncpy(td->td_name, "swapper", sizeof (td->td_name));
500
501 callout_init_mtx(&p->p_itcallout, &p->p_mtx, 0);
502 callout_init_mtx(&p->p_limco, &p->p_mtx, 0);
503 callout_init(&td->td_slpcallout, CALLOUT_MPSAFE);
504
505 /* Create credentials. */
506 p->p_ucred = crget();
507 p->p_ucred->cr_ngroups = 1; /* group 0 */
508 p->p_ucred->cr_uidinfo = uifind(0);
509 p->p_ucred->cr_ruidinfo = uifind(0);
510 p->p_ucred->cr_prison = &prison0;
511 p->p_ucred->cr_loginclass = loginclass_find("default");
512 #ifdef AUDIT
513 audit_cred_kproc0(p->p_ucred);
514 #endif
515 #ifdef MAC
516 mac_cred_create_swapper(p->p_ucred);
517 #endif
518 td->td_ucred = crhold(p->p_ucred);
519
520 /* Create sigacts. */
521 p->p_sigacts = sigacts_alloc();
522
523 /* Initialize signal state for process 0. */
524 siginit(&proc0);
525
526 /* Create the file descriptor table. */
527 p->p_fd = fdinit(NULL);
528 p->p_fdtol = NULL;
529
530 /* Create the limits structures. */
531 p->p_limit = lim_alloc();
532 for (i = 0; i < RLIM_NLIMITS; i++)
533 p->p_limit->pl_rlimit[i].rlim_cur =
534 p->p_limit->pl_rlimit[i].rlim_max = RLIM_INFINITY;
535 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_cur =
536 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles;
537 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_cur =
538 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc;
539 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_cur = dfldsiz;
540 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_max = maxdsiz;
541 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_cur = dflssiz;
542 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_max = maxssiz;
543 /* Cast to avoid overflow on i386/PAE. */
544 pageablemem = ptoa((vm_paddr_t)cnt.v_free_count);
545 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_cur =
546 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_max = pageablemem;
547 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = pageablemem / 3;
548 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_max = pageablemem;
549 p->p_cpulimit = RLIM_INFINITY;
550
551 /* Initialize resource accounting structures. */
552 racct_create(&p->p_racct);
553
554 p->p_stats = pstats_alloc();
555
556 /* Allocate a prototype map so we have something to fork. */
557 pmap_pinit0(vmspace_pmap(&vmspace0));
558 p->p_vmspace = &vmspace0;
559 vmspace0.vm_refcnt = 1;
560
561 /*
562 * proc0 is not expected to enter usermode, so there is no special
563 * handling for sv_minuser here, like is done for exec_new_vmspace().
564 */
565 vm_map_init(&vmspace0.vm_map, vmspace_pmap(&vmspace0),
566 p->p_sysent->sv_minuser, p->p_sysent->sv_maxuser);
567
568 /*
569 * Call the init and ctor for the new thread and proc. We wait
570 * to do this until all other structures are fairly sane.
571 */
572 EVENTHANDLER_INVOKE(process_init, p);
573 EVENTHANDLER_INVOKE(thread_init, td);
574 EVENTHANDLER_INVOKE(process_ctor, p);
575 EVENTHANDLER_INVOKE(thread_ctor, td);
576
577 /*
578 * Charge root for one process.
579 */
580 (void)chgproccnt(p->p_ucred->cr_ruidinfo, 1, 0);
581 PROC_LOCK(p);
582 racct_add_force(p, RACCT_NPROC, 1);
583 PROC_UNLOCK(p);
584 }
585 SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL);
586
587 /* ARGSUSED*/
588 static void
589 proc0_post(void *dummy __unused)
590 {
591 struct timespec ts;
592 struct proc *p;
593 struct rusage ru;
594 struct thread *td;
595
596 /*
597 * Now we can look at the time, having had a chance to verify the
598 * time from the filesystem. Pretend that proc0 started now.
599 */
600 sx_slock(&allproc_lock);
601 FOREACH_PROC_IN_SYSTEM(p) {
602 microuptime(&p->p_stats->p_start);
603 PROC_SLOCK(p);
604 rufetch(p, &ru); /* Clears thread stats */
605 PROC_SUNLOCK(p);
606 p->p_rux.rux_runtime = 0;
607 p->p_rux.rux_uticks = 0;
608 p->p_rux.rux_sticks = 0;
609 p->p_rux.rux_iticks = 0;
610 FOREACH_THREAD_IN_PROC(p, td) {
611 td->td_runtime = 0;
612 }
613 }
614 sx_sunlock(&allproc_lock);
615 PCPU_SET(switchtime, cpu_ticks());
616 PCPU_SET(switchticks, ticks);
617
618 /*
619 * Give the ``random'' number generator a thump.
620 */
621 nanotime(&ts);
622 srandom(ts.tv_sec ^ ts.tv_nsec);
623 }
624 SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL);
625
626 static void
627 random_init(void *dummy __unused)
628 {
629
630 /*
631 * After CPU has been started we have some randomness on most
632 * platforms via get_cyclecount(). For platforms that don't
633 * we will reseed random(9) in proc0_post() as well.
634 */
635 srandom(get_cyclecount());
636 }
637 SYSINIT(random, SI_SUB_RANDOM, SI_ORDER_FIRST, random_init, NULL);
638
639 /*
640 ***************************************************************************
641 ****
642 **** The following SYSINIT's and glue code should be moved to the
643 **** respective files on a per subsystem basis.
644 ****
645 ***************************************************************************
646 */
647
648
649 /*
650 ***************************************************************************
651 ****
652 **** The following code probably belongs in another file, like
653 **** kern/init_init.c.
654 ****
655 ***************************************************************************
656 */
657
658 /*
659 * List of paths to try when searching for "init".
660 */
661 static char init_path[MAXPATHLEN] =
662 #ifdef INIT_PATH
663 __XSTRING(INIT_PATH);
664 #else
665 "/sbin/init:/sbin/oinit:/sbin/init.bak:/rescue/init:/stand/sysinstall";
666 #endif
667 SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0,
668 "Path used to search the init process");
669
670 /*
671 * Shutdown timeout of init(8).
672 * Unused within kernel, but used to control init(8), hence do not remove.
673 */
674 #ifndef INIT_SHUTDOWN_TIMEOUT
675 #define INIT_SHUTDOWN_TIMEOUT 120
676 #endif
677 static int init_shutdown_timeout = INIT_SHUTDOWN_TIMEOUT;
678 SYSCTL_INT(_kern, OID_AUTO, init_shutdown_timeout,
679 CTLFLAG_RW, &init_shutdown_timeout, 0, "Shutdown timeout of init(8). "
680 "Unused within kernel, but used to control init(8)");
681
682 /*
683 * Start the initial user process; try exec'ing each pathname in init_path.
684 * The program is invoked with one argument containing the boot flags.
685 */
686 static void
687 start_init(void *dummy)
688 {
689 vm_offset_t addr;
690 struct execve_args args;
691 int options, error;
692 char *var, *path, *next, *s;
693 char *ucp, **uap, *arg0, *arg1;
694 struct thread *td;
695 struct proc *p;
696
697 mtx_lock(&Giant);
698
699 GIANT_REQUIRED;
700
701 td = curthread;
702 p = td->td_proc;
703
704 vfs_mountroot();
705
706 /*
707 * Need just enough stack to hold the faked-up "execve()" arguments.
708 */
709 addr = p->p_sysent->sv_usrstack - PAGE_SIZE;
710 if (vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &addr, PAGE_SIZE,
711 FALSE, VM_PROT_ALL, VM_PROT_ALL, 0) != 0)
712 panic("init: couldn't allocate argument space");
713 p->p_vmspace->vm_maxsaddr = (caddr_t)addr;
714 p->p_vmspace->vm_ssize = 1;
715
716 if ((var = getenv("init_path")) != NULL) {
717 strlcpy(init_path, var, sizeof(init_path));
718 freeenv(var);
719 }
720
721 for (path = init_path; *path != '\0'; path = next) {
722 while (*path == ':')
723 path++;
724 if (*path == '\0')
725 break;
726 for (next = path; *next != '\0' && *next != ':'; next++)
727 /* nothing */ ;
728 if (bootverbose)
729 printf("start_init: trying %.*s\n", (int)(next - path),
730 path);
731
732 /*
733 * Move out the boot flag argument.
734 */
735 options = 0;
736 ucp = (char *)p->p_sysent->sv_usrstack;
737 (void)subyte(--ucp, 0); /* trailing zero */
738 if (boothowto & RB_SINGLE) {
739 (void)subyte(--ucp, 's');
740 options = 1;
741 }
742 #ifdef notyet
743 if (boothowto & RB_FASTBOOT) {
744 (void)subyte(--ucp, 'f');
745 options = 1;
746 }
747 #endif
748
749 #ifdef BOOTCDROM
750 (void)subyte(--ucp, 'C');
751 options = 1;
752 #endif
753
754 if (options == 0)
755 (void)subyte(--ucp, '-');
756 (void)subyte(--ucp, '-'); /* leading hyphen */
757 arg1 = ucp;
758
759 /*
760 * Move out the file name (also arg 0).
761 */
762 (void)subyte(--ucp, 0);
763 for (s = next - 1; s >= path; s--)
764 (void)subyte(--ucp, *s);
765 arg0 = ucp;
766
767 /*
768 * Move out the arg pointers.
769 */
770 uap = (char **)((intptr_t)ucp & ~(sizeof(intptr_t)-1));
771 (void)suword((caddr_t)--uap, (long)0); /* terminator */
772 (void)suword((caddr_t)--uap, (long)(intptr_t)arg1);
773 (void)suword((caddr_t)--uap, (long)(intptr_t)arg0);
774
775 /*
776 * Point at the arguments.
777 */
778 args.fname = arg0;
779 args.argv = uap;
780 args.envv = NULL;
781
782 /*
783 * Now try to exec the program. If can't for any reason
784 * other than it doesn't exist, complain.
785 *
786 * Otherwise, return via fork_trampoline() all the way
787 * to user mode as init!
788 */
789 if ((error = sys_execve(td, &args)) == 0) {
790 mtx_unlock(&Giant);
791 return;
792 }
793 if (error != ENOENT)
794 printf("exec %.*s: error %d\n", (int)(next - path),
795 path, error);
796 }
797 printf("init: not found in path %s\n", init_path);
798 panic("no init");
799 }
800
801 /*
802 * Like kproc_create(), but runs in it's own address space.
803 * We do this early to reserve pid 1.
804 *
805 * Note special case - do not make it runnable yet. Other work
806 * in progress will change this more.
807 */
808 static void
809 create_init(const void *udata __unused)
810 {
811 struct ucred *newcred, *oldcred;
812 int error;
813
814 error = fork1(&thread0, RFFDG | RFPROC | RFSTOPPED, 0, &initproc,
815 NULL, 0);
816 if (error)
817 panic("cannot fork init: %d\n", error);
818 KASSERT(initproc->p_pid == 1, ("create_init: initproc->p_pid != 1"));
819 /* divorce init's credentials from the kernel's */
820 newcred = crget();
821 PROC_LOCK(initproc);
822 initproc->p_flag |= P_SYSTEM | P_INMEM;
823 oldcred = initproc->p_ucred;
824 crcopy(newcred, oldcred);
825 #ifdef MAC
826 mac_cred_create_init(newcred);
827 #endif
828 #ifdef AUDIT
829 audit_cred_proc1(newcred);
830 #endif
831 initproc->p_ucred = newcred;
832 PROC_UNLOCK(initproc);
833 crfree(oldcred);
834 cred_update_thread(FIRST_THREAD_IN_PROC(initproc));
835 cpu_set_fork_handler(FIRST_THREAD_IN_PROC(initproc), start_init, NULL);
836 }
837 SYSINIT(init, SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL);
838
839 /*
840 * Make it runnable now.
841 */
842 static void
843 kick_init(const void *udata __unused)
844 {
845 struct thread *td;
846
847 td = FIRST_THREAD_IN_PROC(initproc);
848 thread_lock(td);
849 TD_SET_CAN_RUN(td);
850 sched_add(td, SRQ_BORING);
851 thread_unlock(td);
852 }
853 SYSINIT(kickinit, SI_SUB_KTHREAD_INIT, SI_ORDER_FIRST, kick_init, NULL);
Cache object: 6d766c52aedba859acf88d8c320f7bf6
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