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
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 for (sipp = sysinit; sipp < sysinit_end; sipp++) {
241
242 if ((*sipp)->subsystem == SI_SUB_DUMMY)
243 continue; /* skip dummy task(s)*/
244
245 if ((*sipp)->subsystem == SI_SUB_DONE)
246 continue;
247
248 #if defined(VERBOSE_SYSINIT)
249 if ((*sipp)->subsystem > last) {
250 verbose = 1;
251 last = (*sipp)->subsystem;
252 printf("subsystem %x\n", last);
253 }
254 if (verbose) {
255 #if defined(DDB)
256 const char *func, *data;
257
258 func = symbol_name((vm_offset_t)(*sipp)->func,
259 DB_STGY_PROC);
260 data = symbol_name((vm_offset_t)(*sipp)->udata,
261 DB_STGY_ANY);
262 if (func != NULL && data != NULL)
263 printf(" %s(&%s)... ", func, data);
264 else if (func != NULL)
265 printf(" %s(%p)... ", func, (*sipp)->udata);
266 else
267 #endif
268 printf(" %p(%p)... ", (*sipp)->func,
269 (*sipp)->udata);
270 }
271 #endif
272
273 /* Call function */
274 (*((*sipp)->func))((*sipp)->udata);
275
276 #if defined(VERBOSE_SYSINIT)
277 if (verbose)
278 printf("done.\n");
279 #endif
280
281 /* Check off the one we're just done */
282 (*sipp)->subsystem = SI_SUB_DONE;
283
284 /* Check if we've installed more sysinit items via KLD */
285 if (newsysinit != NULL) {
286 if (sysinit != SET_BEGIN(sysinit_set))
287 free(sysinit, M_TEMP);
288 sysinit = newsysinit;
289 sysinit_end = newsysinit_end;
290 newsysinit = NULL;
291 newsysinit_end = NULL;
292 goto restart;
293 }
294 }
295
296 mtx_assert(&Giant, MA_OWNED | MA_NOTRECURSED);
297 mtx_unlock(&Giant);
298
299 /*
300 * Now hand over this thread to swapper.
301 */
302 swapper();
303 /* NOTREACHED*/
304 }
305
306
307 /*
308 ***************************************************************************
309 ****
310 **** The following SYSINIT's belong elsewhere, but have not yet
311 **** been moved.
312 ****
313 ***************************************************************************
314 */
315 static void
316 print_caddr_t(void *data)
317 {
318 printf("%s", (char *)data);
319 }
320
321 static void
322 print_version(void *data __unused)
323 {
324 int len;
325
326 /* Strip a trailing newline from version. */
327 len = strlen(version);
328 while (len > 0 && version[len - 1] == '\n')
329 len--;
330 printf("%.*s %s\n", len, version, machine);
331 printf("%s\n", compiler_version);
332 }
333
334 SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t,
335 copyright);
336 SYSINIT(trademark, SI_SUB_COPYRIGHT, SI_ORDER_SECOND, print_caddr_t,
337 trademark);
338 SYSINIT(version, SI_SUB_COPYRIGHT, SI_ORDER_THIRD, print_version, NULL);
339
340 #ifdef WITNESS
341 static char wit_warn[] =
342 "WARNING: WITNESS option enabled, expect reduced performance.\n";
343 SYSINIT(witwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 1,
344 print_caddr_t, wit_warn);
345 SYSINIT(witwarn2, SI_SUB_LAST, SI_ORDER_THIRD + 1,
346 print_caddr_t, wit_warn);
347 #endif
348
349 #ifdef DIAGNOSTIC
350 static char diag_warn[] =
351 "WARNING: DIAGNOSTIC option enabled, expect reduced performance.\n";
352 SYSINIT(diagwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 2,
353 print_caddr_t, diag_warn);
354 SYSINIT(diagwarn2, SI_SUB_LAST, SI_ORDER_THIRD + 2,
355 print_caddr_t, diag_warn);
356 #endif
357
358 static int
359 null_fetch_syscall_args(struct thread *td __unused,
360 struct syscall_args *sa __unused)
361 {
362
363 panic("null_fetch_syscall_args");
364 }
365
366 static void
367 null_set_syscall_retval(struct thread *td __unused, int error __unused)
368 {
369
370 panic("null_set_syscall_retval");
371 }
372
373 struct sysentvec null_sysvec = {
374 .sv_size = 0,
375 .sv_table = NULL,
376 .sv_mask = 0,
377 .sv_sigsize = 0,
378 .sv_sigtbl = NULL,
379 .sv_errsize = 0,
380 .sv_errtbl = NULL,
381 .sv_transtrap = NULL,
382 .sv_fixup = NULL,
383 .sv_sendsig = NULL,
384 .sv_sigcode = NULL,
385 .sv_szsigcode = NULL,
386 .sv_prepsyscall = NULL,
387 .sv_name = "null",
388 .sv_coredump = NULL,
389 .sv_imgact_try = NULL,
390 .sv_minsigstksz = 0,
391 .sv_pagesize = PAGE_SIZE,
392 .sv_minuser = VM_MIN_ADDRESS,
393 .sv_maxuser = VM_MAXUSER_ADDRESS,
394 .sv_usrstack = USRSTACK,
395 .sv_psstrings = PS_STRINGS,
396 .sv_stackprot = VM_PROT_ALL,
397 .sv_copyout_strings = NULL,
398 .sv_setregs = NULL,
399 .sv_fixlimit = NULL,
400 .sv_maxssiz = NULL,
401 .sv_flags = 0,
402 .sv_set_syscall_retval = null_set_syscall_retval,
403 .sv_fetch_syscall_args = null_fetch_syscall_args,
404 .sv_syscallnames = NULL,
405 .sv_schedtail = NULL,
406 };
407
408 /*
409 ***************************************************************************
410 ****
411 **** The two following SYSINIT's are proc0 specific glue code. I am not
412 **** convinced that they can not be safely combined, but their order of
413 **** operation has been maintained as the same as the original init_main.c
414 **** for right now.
415 ****
416 **** These probably belong in init_proc.c or kern_proc.c, since they
417 **** deal with proc0 (the fork template process).
418 ****
419 ***************************************************************************
420 */
421 /* ARGSUSED*/
422 static void
423 proc0_init(void *dummy __unused)
424 {
425 struct proc *p;
426 struct thread *td;
427 vm_paddr_t pageablemem;
428 int i;
429
430 GIANT_REQUIRED;
431 p = &proc0;
432 td = &thread0;
433
434 /*
435 * Initialize magic number and osrel.
436 */
437 p->p_magic = P_MAGIC;
438 p->p_osrel = osreldate;
439
440 /*
441 * Initialize thread and process structures.
442 */
443 procinit(); /* set up proc zone */
444 threadinit(); /* set up UMA zones */
445
446 /*
447 * Initialise scheduler resources.
448 * Add scheduler specific parts to proc, thread as needed.
449 */
450 schedinit(); /* scheduler gets its house in order */
451 /*
452 * Initialize sleep queue hash table
453 */
454 sleepinit();
455
456 /*
457 * additional VM structures
458 */
459 vm_init2();
460
461 /*
462 * Create process 0 (the swapper).
463 */
464 LIST_INSERT_HEAD(&allproc, p, p_list);
465 LIST_INSERT_HEAD(PIDHASH(0), p, p_hash);
466 mtx_init(&pgrp0.pg_mtx, "process group", NULL, MTX_DEF | MTX_DUPOK);
467 p->p_pgrp = &pgrp0;
468 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash);
469 LIST_INIT(&pgrp0.pg_members);
470 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist);
471
472 pgrp0.pg_session = &session0;
473 mtx_init(&session0.s_mtx, "session", NULL, MTX_DEF);
474 refcount_init(&session0.s_count, 1);
475 session0.s_leader = p;
476
477 p->p_sysent = &null_sysvec;
478 p->p_flag = P_SYSTEM | P_INMEM | P_KTHREAD;
479 p->p_flag2 = 0;
480 p->p_state = PRS_NORMAL;
481 knlist_init_mtx(&p->p_klist, &p->p_mtx);
482 STAILQ_INIT(&p->p_ktr);
483 p->p_nice = NZERO;
484 /* pid_max cannot be greater than PID_MAX */
485 td->td_tid = PID_MAX + 1;
486 LIST_INSERT_HEAD(TIDHASH(td->td_tid), td, td_hash);
487 td->td_state = TDS_RUNNING;
488 td->td_pri_class = PRI_TIMESHARE;
489 td->td_user_pri = PUSER;
490 td->td_base_user_pri = PUSER;
491 td->td_lend_user_pri = PRI_MAX;
492 td->td_priority = PVM;
493 td->td_base_pri = PVM;
494 td->td_oncpu = 0;
495 td->td_flags = TDF_INMEM|TDP_KTHREAD;
496 td->td_cpuset = cpuset_thread0();
497 prison0.pr_cpuset = cpuset_ref(td->td_cpuset);
498 p->p_peers = 0;
499 p->p_leader = p;
500
501
502 strncpy(p->p_comm, "kernel", sizeof (p->p_comm));
503 strncpy(td->td_name, "swapper", sizeof (td->td_name));
504
505 callout_init_mtx(&p->p_itcallout, &p->p_mtx, 0);
506 callout_init_mtx(&p->p_limco, &p->p_mtx, 0);
507 callout_init(&td->td_slpcallout, CALLOUT_MPSAFE);
508
509 /* Create credentials. */
510 p->p_ucred = crget();
511 p->p_ucred->cr_ngroups = 1; /* group 0 */
512 p->p_ucred->cr_uidinfo = uifind(0);
513 p->p_ucred->cr_ruidinfo = uifind(0);
514 p->p_ucred->cr_prison = &prison0;
515 p->p_ucred->cr_loginclass = loginclass_find("default");
516 #ifdef AUDIT
517 audit_cred_kproc0(p->p_ucred);
518 #endif
519 #ifdef MAC
520 mac_cred_create_swapper(p->p_ucred);
521 #endif
522 td->td_ucred = crhold(p->p_ucred);
523
524 /* Create sigacts. */
525 p->p_sigacts = sigacts_alloc();
526
527 /* Initialize signal state for process 0. */
528 siginit(&proc0);
529
530 /* Create the file descriptor table. */
531 p->p_fd = fdinit(NULL);
532 p->p_fdtol = NULL;
533
534 /* Create the limits structures. */
535 p->p_limit = lim_alloc();
536 for (i = 0; i < RLIM_NLIMITS; i++)
537 p->p_limit->pl_rlimit[i].rlim_cur =
538 p->p_limit->pl_rlimit[i].rlim_max = RLIM_INFINITY;
539 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_cur =
540 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles;
541 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_cur =
542 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc;
543 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_cur = dfldsiz;
544 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_max = maxdsiz;
545 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_cur = dflssiz;
546 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_max = maxssiz;
547 /* Cast to avoid overflow on i386/PAE. */
548 pageablemem = ptoa((vm_paddr_t)cnt.v_free_count);
549 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_cur =
550 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_max = pageablemem;
551 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = pageablemem / 3;
552 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_max = pageablemem;
553 p->p_cpulimit = RLIM_INFINITY;
554
555 /* Initialize resource accounting structures. */
556 racct_create(&p->p_racct);
557
558 p->p_stats = pstats_alloc();
559
560 /* Allocate a prototype map so we have something to fork. */
561 pmap_pinit0(vmspace_pmap(&vmspace0));
562 p->p_vmspace = &vmspace0;
563 vmspace0.vm_refcnt = 1;
564
565 /*
566 * proc0 is not expected to enter usermode, so there is no special
567 * handling for sv_minuser here, like is done for exec_new_vmspace().
568 */
569 vm_map_init(&vmspace0.vm_map, vmspace_pmap(&vmspace0),
570 p->p_sysent->sv_minuser, p->p_sysent->sv_maxuser);
571
572 /*
573 * Call the init and ctor for the new thread and proc. We wait
574 * to do this until all other structures are fairly sane.
575 */
576 EVENTHANDLER_INVOKE(process_init, p);
577 EVENTHANDLER_INVOKE(thread_init, td);
578 EVENTHANDLER_INVOKE(process_ctor, p);
579 EVENTHANDLER_INVOKE(thread_ctor, td);
580
581 /*
582 * Charge root for one process.
583 */
584 (void)chgproccnt(p->p_ucred->cr_ruidinfo, 1, 0);
585 PROC_LOCK(p);
586 racct_add_force(p, RACCT_NPROC, 1);
587 PROC_UNLOCK(p);
588 }
589 SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL);
590
591 /* ARGSUSED*/
592 static void
593 proc0_post(void *dummy __unused)
594 {
595 struct timespec ts;
596 struct proc *p;
597 struct rusage ru;
598 struct thread *td;
599
600 /*
601 * Now we can look at the time, having had a chance to verify the
602 * time from the filesystem. Pretend that proc0 started now.
603 */
604 sx_slock(&allproc_lock);
605 FOREACH_PROC_IN_SYSTEM(p) {
606 microuptime(&p->p_stats->p_start);
607 PROC_SLOCK(p);
608 rufetch(p, &ru); /* Clears thread stats */
609 PROC_SUNLOCK(p);
610 p->p_rux.rux_runtime = 0;
611 p->p_rux.rux_uticks = 0;
612 p->p_rux.rux_sticks = 0;
613 p->p_rux.rux_iticks = 0;
614 FOREACH_THREAD_IN_PROC(p, td) {
615 td->td_runtime = 0;
616 }
617 }
618 sx_sunlock(&allproc_lock);
619 PCPU_SET(switchtime, cpu_ticks());
620 PCPU_SET(switchticks, ticks);
621
622 /*
623 * Give the ``random'' number generator a thump.
624 */
625 nanotime(&ts);
626 srandom(ts.tv_sec ^ ts.tv_nsec);
627 }
628 SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL);
629
630 static void
631 random_init(void *dummy __unused)
632 {
633
634 /*
635 * After CPU has been started we have some randomness on most
636 * platforms via get_cyclecount(). For platforms that don't
637 * we will reseed random(9) in proc0_post() as well.
638 */
639 srandom(get_cyclecount());
640 }
641 SYSINIT(random, SI_SUB_RANDOM, SI_ORDER_FIRST, random_init, NULL);
642
643 /*
644 ***************************************************************************
645 ****
646 **** The following SYSINIT's and glue code should be moved to the
647 **** respective files on a per subsystem basis.
648 ****
649 ***************************************************************************
650 */
651
652
653 /*
654 ***************************************************************************
655 ****
656 **** The following code probably belongs in another file, like
657 **** kern/init_init.c.
658 ****
659 ***************************************************************************
660 */
661
662 /*
663 * List of paths to try when searching for "init".
664 */
665 static char init_path[MAXPATHLEN] =
666 #ifdef INIT_PATH
667 __XSTRING(INIT_PATH);
668 #else
669 "/sbin/init:/sbin/oinit:/sbin/init.bak:/rescue/init:/stand/sysinstall";
670 #endif
671 SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0,
672 "Path used to search the init process");
673
674 /*
675 * Shutdown timeout of init(8).
676 * Unused within kernel, but used to control init(8), hence do not remove.
677 */
678 #ifndef INIT_SHUTDOWN_TIMEOUT
679 #define INIT_SHUTDOWN_TIMEOUT 120
680 #endif
681 static int init_shutdown_timeout = INIT_SHUTDOWN_TIMEOUT;
682 SYSCTL_INT(_kern, OID_AUTO, init_shutdown_timeout,
683 CTLFLAG_RW, &init_shutdown_timeout, 0, "Shutdown timeout of init(8). "
684 "Unused within kernel, but used to control init(8)");
685
686 /*
687 * Start the initial user process; try exec'ing each pathname in init_path.
688 * The program is invoked with one argument containing the boot flags.
689 */
690 static void
691 start_init(void *dummy)
692 {
693 vm_offset_t addr;
694 struct execve_args args;
695 int options, error;
696 char *var, *path, *next, *s;
697 char *ucp, **uap, *arg0, *arg1;
698 struct thread *td;
699 struct proc *p;
700
701 mtx_lock(&Giant);
702
703 GIANT_REQUIRED;
704
705 td = curthread;
706 p = td->td_proc;
707
708 vfs_mountroot();
709
710 /*
711 * Need just enough stack to hold the faked-up "execve()" arguments.
712 */
713 addr = p->p_sysent->sv_usrstack - PAGE_SIZE;
714 if (vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &addr, PAGE_SIZE,
715 FALSE, VM_PROT_ALL, VM_PROT_ALL, 0) != 0)
716 panic("init: couldn't allocate argument space");
717 p->p_vmspace->vm_maxsaddr = (caddr_t)addr;
718 p->p_vmspace->vm_ssize = 1;
719
720 if ((var = getenv("init_path")) != NULL) {
721 strlcpy(init_path, var, sizeof(init_path));
722 freeenv(var);
723 }
724
725 for (path = init_path; *path != '\0'; path = next) {
726 while (*path == ':')
727 path++;
728 if (*path == '\0')
729 break;
730 for (next = path; *next != '\0' && *next != ':'; next++)
731 /* nothing */ ;
732 if (bootverbose)
733 printf("start_init: trying %.*s\n", (int)(next - path),
734 path);
735
736 /*
737 * Move out the boot flag argument.
738 */
739 options = 0;
740 ucp = (char *)p->p_sysent->sv_usrstack;
741 (void)subyte(--ucp, 0); /* trailing zero */
742 if (boothowto & RB_SINGLE) {
743 (void)subyte(--ucp, 's');
744 options = 1;
745 }
746 #ifdef notyet
747 if (boothowto & RB_FASTBOOT) {
748 (void)subyte(--ucp, 'f');
749 options = 1;
750 }
751 #endif
752
753 #ifdef BOOTCDROM
754 (void)subyte(--ucp, 'C');
755 options = 1;
756 #endif
757
758 if (options == 0)
759 (void)subyte(--ucp, '-');
760 (void)subyte(--ucp, '-'); /* leading hyphen */
761 arg1 = ucp;
762
763 /*
764 * Move out the file name (also arg 0).
765 */
766 (void)subyte(--ucp, 0);
767 for (s = next - 1; s >= path; s--)
768 (void)subyte(--ucp, *s);
769 arg0 = ucp;
770
771 /*
772 * Move out the arg pointers.
773 */
774 uap = (char **)((intptr_t)ucp & ~(sizeof(intptr_t)-1));
775 (void)suword((caddr_t)--uap, (long)0); /* terminator */
776 (void)suword((caddr_t)--uap, (long)(intptr_t)arg1);
777 (void)suword((caddr_t)--uap, (long)(intptr_t)arg0);
778
779 /*
780 * Point at the arguments.
781 */
782 args.fname = arg0;
783 args.argv = uap;
784 args.envv = NULL;
785
786 /*
787 * Now try to exec the program. If can't for any reason
788 * other than it doesn't exist, complain.
789 *
790 * Otherwise, return via fork_trampoline() all the way
791 * to user mode as init!
792 */
793 if ((error = sys_execve(td, &args)) == 0) {
794 mtx_unlock(&Giant);
795 return;
796 }
797 if (error != ENOENT)
798 printf("exec %.*s: error %d\n", (int)(next - path),
799 path, error);
800 }
801 printf("init: not found in path %s\n", init_path);
802 panic("no init");
803 }
804
805 /*
806 * Like kproc_create(), but runs in it's own address space.
807 * We do this early to reserve pid 1.
808 *
809 * Note special case - do not make it runnable yet. Other work
810 * in progress will change this more.
811 */
812 static void
813 create_init(const void *udata __unused)
814 {
815 struct ucred *newcred, *oldcred;
816 int error;
817
818 error = fork1(&thread0, RFFDG | RFPROC | RFSTOPPED, 0, &initproc,
819 NULL, 0);
820 if (error)
821 panic("cannot fork init: %d\n", error);
822 KASSERT(initproc->p_pid == 1, ("create_init: initproc->p_pid != 1"));
823 /* divorce init's credentials from the kernel's */
824 newcred = crget();
825 PROC_LOCK(initproc);
826 initproc->p_flag |= P_SYSTEM | P_INMEM;
827 oldcred = initproc->p_ucred;
828 crcopy(newcred, oldcred);
829 #ifdef MAC
830 mac_cred_create_init(newcred);
831 #endif
832 #ifdef AUDIT
833 audit_cred_proc1(newcred);
834 #endif
835 initproc->p_ucred = newcred;
836 PROC_UNLOCK(initproc);
837 crfree(oldcred);
838 cred_update_thread(FIRST_THREAD_IN_PROC(initproc));
839 cpu_set_fork_handler(FIRST_THREAD_IN_PROC(initproc), start_init, NULL);
840 }
841 SYSINIT(init, SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL);
842
843 /*
844 * Make it runnable now.
845 */
846 static void
847 kick_init(const void *udata __unused)
848 {
849 struct thread *td;
850
851 td = FIRST_THREAD_IN_PROC(initproc);
852 thread_lock(td);
853 TD_SET_CAN_RUN(td);
854 sched_add(td, SRQ_BORING);
855 thread_unlock(td);
856 }
857 SYSINIT(kickinit, SI_SUB_KTHREAD_INIT, SI_ORDER_FIRST, kick_init, NULL);
Cache object: d387458af4076385ca8e7a591010e7ab
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