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/10.1/sys/kern/init_main.c 255708 2013-09-19 18:53:42Z jhb $");
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 #ifndef BOOTHOWTO
105 #define BOOTHOWTO 0
106 #endif
107 int boothowto = BOOTHOWTO; /* initialized so that it can be patched */
108 SYSCTL_INT(_debug, OID_AUTO, boothowto, CTLFLAG_RD, &boothowto, 0,
109 "Boot control flags, passed from loader");
110
111 #ifndef BOOTVERBOSE
112 #define BOOTVERBOSE 0
113 #endif
114 int bootverbose = BOOTVERBOSE;
115 SYSCTL_INT(_debug, OID_AUTO, bootverbose, CTLFLAG_RW, &bootverbose, 0,
116 "Control the output of verbose kernel messages");
117
118 /*
119 * This ensures that there is at least one entry so that the sysinit_set
120 * symbol is not undefined. A sybsystem ID of SI_SUB_DUMMY is never
121 * executed.
122 */
123 SYSINIT(placeholder, SI_SUB_DUMMY, SI_ORDER_ANY, NULL, NULL);
124
125 /*
126 * The sysinit table itself. Items are checked off as the are run.
127 * If we want to register new sysinit types, add them to newsysinit.
128 */
129 SET_DECLARE(sysinit_set, struct sysinit);
130 struct sysinit **sysinit, **sysinit_end;
131 struct sysinit **newsysinit, **newsysinit_end;
132
133 /*
134 * Merge a new sysinit set into the current set, reallocating it if
135 * necessary. This can only be called after malloc is running.
136 */
137 void
138 sysinit_add(struct sysinit **set, struct sysinit **set_end)
139 {
140 struct sysinit **newset;
141 struct sysinit **sipp;
142 struct sysinit **xipp;
143 int count;
144
145 count = set_end - set;
146 if (newsysinit)
147 count += newsysinit_end - newsysinit;
148 else
149 count += sysinit_end - sysinit;
150 newset = malloc(count * sizeof(*sipp), M_TEMP, M_NOWAIT);
151 if (newset == NULL)
152 panic("cannot malloc for sysinit");
153 xipp = newset;
154 if (newsysinit)
155 for (sipp = newsysinit; sipp < newsysinit_end; sipp++)
156 *xipp++ = *sipp;
157 else
158 for (sipp = sysinit; sipp < sysinit_end; sipp++)
159 *xipp++ = *sipp;
160 for (sipp = set; sipp < set_end; sipp++)
161 *xipp++ = *sipp;
162 if (newsysinit)
163 free(newsysinit, M_TEMP);
164 newsysinit = newset;
165 newsysinit_end = newset + count;
166 }
167
168 #if defined (DDB) && defined(VERBOSE_SYSINIT)
169 static const char *
170 symbol_name(vm_offset_t va, db_strategy_t strategy)
171 {
172 const char *name;
173 c_db_sym_t sym;
174 db_expr_t offset;
175
176 if (va == 0)
177 return (NULL);
178 sym = db_search_symbol(va, strategy, &offset);
179 if (offset != 0)
180 return (NULL);
181 db_symbol_values(sym, &name, NULL);
182 return (name);
183 }
184 #endif
185
186 /*
187 * System startup; initialize the world, create process 0, mount root
188 * filesystem, and fork to create init and pagedaemon. Most of the
189 * hard work is done in the lower-level initialization routines including
190 * startup(), which does memory initialization and autoconfiguration.
191 *
192 * This allows simple addition of new kernel subsystems that require
193 * boot time initialization. It also allows substitution of subsystem
194 * (for instance, a scheduler, kernel profiler, or VM system) by object
195 * module. Finally, it allows for optional "kernel threads".
196 */
197 void
198 mi_startup(void)
199 {
200
201 register struct sysinit **sipp; /* system initialization*/
202 register struct sysinit **xipp; /* interior loop of sort*/
203 register struct sysinit *save; /* bubble*/
204
205 #if defined(VERBOSE_SYSINIT)
206 int last;
207 int verbose;
208 #endif
209
210 if (boothowto & RB_VERBOSE)
211 bootverbose++;
212
213 if (sysinit == NULL) {
214 sysinit = SET_BEGIN(sysinit_set);
215 sysinit_end = SET_LIMIT(sysinit_set);
216 }
217
218 restart:
219 /*
220 * Perform a bubble sort of the system initialization objects by
221 * their subsystem (primary key) and order (secondary key).
222 */
223 for (sipp = sysinit; sipp < sysinit_end; sipp++) {
224 for (xipp = sipp + 1; xipp < sysinit_end; xipp++) {
225 if ((*sipp)->subsystem < (*xipp)->subsystem ||
226 ((*sipp)->subsystem == (*xipp)->subsystem &&
227 (*sipp)->order <= (*xipp)->order))
228 continue; /* skip*/
229 save = *sipp;
230 *sipp = *xipp;
231 *xipp = save;
232 }
233 }
234
235 #if defined(VERBOSE_SYSINIT)
236 last = SI_SUB_COPYRIGHT;
237 verbose = 0;
238 #if !defined(DDB)
239 printf("VERBOSE_SYSINIT: DDB not enabled, symbol lookups disabled.\n");
240 #endif
241 #endif
242
243 /*
244 * Traverse the (now) ordered list of system initialization tasks.
245 * Perform each task, and continue on to the next task.
246 */
247 for (sipp = sysinit; sipp < sysinit_end; sipp++) {
248
249 if ((*sipp)->subsystem == SI_SUB_DUMMY)
250 continue; /* skip dummy task(s)*/
251
252 if ((*sipp)->subsystem == SI_SUB_DONE)
253 continue;
254
255 #if defined(VERBOSE_SYSINIT)
256 if ((*sipp)->subsystem > last) {
257 verbose = 1;
258 last = (*sipp)->subsystem;
259 printf("subsystem %x\n", last);
260 }
261 if (verbose) {
262 #if defined(DDB)
263 const char *func, *data;
264
265 func = symbol_name((vm_offset_t)(*sipp)->func,
266 DB_STGY_PROC);
267 data = symbol_name((vm_offset_t)(*sipp)->udata,
268 DB_STGY_ANY);
269 if (func != NULL && data != NULL)
270 printf(" %s(&%s)... ", func, data);
271 else if (func != NULL)
272 printf(" %s(%p)... ", func, (*sipp)->udata);
273 else
274 #endif
275 printf(" %p(%p)... ", (*sipp)->func,
276 (*sipp)->udata);
277 }
278 #endif
279
280 /* Call function */
281 (*((*sipp)->func))((*sipp)->udata);
282
283 #if defined(VERBOSE_SYSINIT)
284 if (verbose)
285 printf("done.\n");
286 #endif
287
288 /* Check off the one we're just done */
289 (*sipp)->subsystem = SI_SUB_DONE;
290
291 /* Check if we've installed more sysinit items via KLD */
292 if (newsysinit != NULL) {
293 if (sysinit != SET_BEGIN(sysinit_set))
294 free(sysinit, M_TEMP);
295 sysinit = newsysinit;
296 sysinit_end = newsysinit_end;
297 newsysinit = NULL;
298 newsysinit_end = NULL;
299 goto restart;
300 }
301 }
302
303 mtx_assert(&Giant, MA_OWNED | MA_NOTRECURSED);
304 mtx_unlock(&Giant);
305
306 /*
307 * Now hand over this thread to swapper.
308 */
309 swapper();
310 /* NOTREACHED*/
311 }
312
313
314 /*
315 ***************************************************************************
316 ****
317 **** The following SYSINIT's belong elsewhere, but have not yet
318 **** been moved.
319 ****
320 ***************************************************************************
321 */
322 static void
323 print_caddr_t(void *data)
324 {
325 printf("%s", (char *)data);
326 }
327
328 static void
329 print_version(void *data __unused)
330 {
331 int len;
332
333 /* Strip a trailing newline from version. */
334 len = strlen(version);
335 while (len > 0 && version[len - 1] == '\n')
336 len--;
337 printf("%.*s %s\n", len, version, machine);
338 printf("%s\n", compiler_version);
339 }
340
341 SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t,
342 copyright);
343 SYSINIT(trademark, SI_SUB_COPYRIGHT, SI_ORDER_SECOND, print_caddr_t,
344 trademark);
345 SYSINIT(version, SI_SUB_COPYRIGHT, SI_ORDER_THIRD, print_version, NULL);
346
347 #ifdef WITNESS
348 static char wit_warn[] =
349 "WARNING: WITNESS option enabled, expect reduced performance.\n";
350 SYSINIT(witwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 1,
351 print_caddr_t, wit_warn);
352 SYSINIT(witwarn2, SI_SUB_LAST, SI_ORDER_THIRD + 1,
353 print_caddr_t, wit_warn);
354 #endif
355
356 #ifdef DIAGNOSTIC
357 static char diag_warn[] =
358 "WARNING: DIAGNOSTIC option enabled, expect reduced performance.\n";
359 SYSINIT(diagwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 2,
360 print_caddr_t, diag_warn);
361 SYSINIT(diagwarn2, SI_SUB_LAST, SI_ORDER_THIRD + 2,
362 print_caddr_t, diag_warn);
363 #endif
364
365 static int
366 null_fetch_syscall_args(struct thread *td __unused,
367 struct syscall_args *sa __unused)
368 {
369
370 panic("null_fetch_syscall_args");
371 }
372
373 static void
374 null_set_syscall_retval(struct thread *td __unused, int error __unused)
375 {
376
377 panic("null_set_syscall_retval");
378 }
379
380 struct sysentvec null_sysvec = {
381 .sv_size = 0,
382 .sv_table = NULL,
383 .sv_mask = 0,
384 .sv_sigsize = 0,
385 .sv_sigtbl = NULL,
386 .sv_errsize = 0,
387 .sv_errtbl = NULL,
388 .sv_transtrap = NULL,
389 .sv_fixup = NULL,
390 .sv_sendsig = NULL,
391 .sv_sigcode = NULL,
392 .sv_szsigcode = NULL,
393 .sv_prepsyscall = NULL,
394 .sv_name = "null",
395 .sv_coredump = NULL,
396 .sv_imgact_try = NULL,
397 .sv_minsigstksz = 0,
398 .sv_pagesize = PAGE_SIZE,
399 .sv_minuser = VM_MIN_ADDRESS,
400 .sv_maxuser = VM_MAXUSER_ADDRESS,
401 .sv_usrstack = USRSTACK,
402 .sv_psstrings = PS_STRINGS,
403 .sv_stackprot = VM_PROT_ALL,
404 .sv_copyout_strings = NULL,
405 .sv_setregs = NULL,
406 .sv_fixlimit = NULL,
407 .sv_maxssiz = NULL,
408 .sv_flags = 0,
409 .sv_set_syscall_retval = null_set_syscall_retval,
410 .sv_fetch_syscall_args = null_fetch_syscall_args,
411 .sv_syscallnames = NULL,
412 .sv_schedtail = NULL,
413 };
414
415 /*
416 ***************************************************************************
417 ****
418 **** The two following SYSINIT's are proc0 specific glue code. I am not
419 **** convinced that they can not be safely combined, but their order of
420 **** operation has been maintained as the same as the original init_main.c
421 **** for right now.
422 ****
423 **** These probably belong in init_proc.c or kern_proc.c, since they
424 **** deal with proc0 (the fork template process).
425 ****
426 ***************************************************************************
427 */
428 /* ARGSUSED*/
429 static void
430 proc0_init(void *dummy __unused)
431 {
432 struct proc *p;
433 struct thread *td;
434 vm_paddr_t pageablemem;
435 int i;
436
437 GIANT_REQUIRED;
438 p = &proc0;
439 td = &thread0;
440
441 /*
442 * Initialize magic number and osrel.
443 */
444 p->p_magic = P_MAGIC;
445 p->p_osrel = osreldate;
446
447 /*
448 * Initialize thread and process structures.
449 */
450 procinit(); /* set up proc zone */
451 threadinit(); /* set up UMA zones */
452
453 /*
454 * Initialise scheduler resources.
455 * Add scheduler specific parts to proc, thread as needed.
456 */
457 schedinit(); /* scheduler gets its house in order */
458
459 /*
460 * Create process 0 (the swapper).
461 */
462 LIST_INSERT_HEAD(&allproc, p, p_list);
463 LIST_INSERT_HEAD(PIDHASH(0), p, p_hash);
464 mtx_init(&pgrp0.pg_mtx, "process group", NULL, MTX_DEF | MTX_DUPOK);
465 p->p_pgrp = &pgrp0;
466 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash);
467 LIST_INIT(&pgrp0.pg_members);
468 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist);
469
470 pgrp0.pg_session = &session0;
471 mtx_init(&session0.s_mtx, "session", NULL, MTX_DEF);
472 refcount_init(&session0.s_count, 1);
473 session0.s_leader = p;
474
475 p->p_sysent = &null_sysvec;
476 p->p_flag = P_SYSTEM | P_INMEM;
477 p->p_flag2 = 0;
478 p->p_state = PRS_NORMAL;
479 knlist_init_mtx(&p->p_klist, &p->p_mtx);
480 STAILQ_INIT(&p->p_ktr);
481 p->p_nice = NZERO;
482 /* pid_max cannot be greater than PID_MAX */
483 td->td_tid = PID_MAX + 1;
484 LIST_INSERT_HEAD(TIDHASH(td->td_tid), td, td_hash);
485 td->td_state = TDS_RUNNING;
486 td->td_pri_class = PRI_TIMESHARE;
487 td->td_user_pri = PUSER;
488 td->td_base_user_pri = PUSER;
489 td->td_lend_user_pri = PRI_MAX;
490 td->td_priority = PVM;
491 td->td_base_pri = PVM;
492 td->td_oncpu = 0;
493 td->td_flags = TDF_INMEM;
494 td->td_pflags = TDP_KTHREAD;
495 td->td_cpuset = cpuset_thread0();
496 prison0.pr_cpuset = cpuset_ref(td->td_cpuset);
497 p->p_peers = 0;
498 p->p_leader = p;
499
500
501 strncpy(p->p_comm, "kernel", sizeof (p->p_comm));
502 strncpy(td->td_name, "swapper", sizeof (td->td_name));
503
504 callout_init_mtx(&p->p_itcallout, &p->p_mtx, 0);
505 callout_init_mtx(&p->p_limco, &p->p_mtx, 0);
506 callout_init(&td->td_slpcallout, CALLOUT_MPSAFE);
507
508 /* Create credentials. */
509 p->p_ucred = crget();
510 p->p_ucred->cr_ngroups = 1; /* group 0 */
511 p->p_ucred->cr_uidinfo = uifind(0);
512 p->p_ucred->cr_ruidinfo = uifind(0);
513 p->p_ucred->cr_prison = &prison0;
514 p->p_ucred->cr_loginclass = loginclass_find("default");
515 #ifdef AUDIT
516 audit_cred_kproc0(p->p_ucred);
517 #endif
518 #ifdef MAC
519 mac_cred_create_swapper(p->p_ucred);
520 #endif
521 td->td_ucred = crhold(p->p_ucred);
522
523 /* Create sigacts. */
524 p->p_sigacts = sigacts_alloc();
525
526 /* Initialize signal state for process 0. */
527 siginit(&proc0);
528
529 /* Create the file descriptor table. */
530 p->p_fd = fdinit(NULL);
531 p->p_fdtol = NULL;
532
533 /* Create the limits structures. */
534 p->p_limit = lim_alloc();
535 for (i = 0; i < RLIM_NLIMITS; i++)
536 p->p_limit->pl_rlimit[i].rlim_cur =
537 p->p_limit->pl_rlimit[i].rlim_max = RLIM_INFINITY;
538 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_cur =
539 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles;
540 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_cur =
541 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc;
542 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_cur = dfldsiz;
543 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_max = maxdsiz;
544 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_cur = dflssiz;
545 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_max = maxssiz;
546 /* Cast to avoid overflow on i386/PAE. */
547 pageablemem = ptoa((vm_paddr_t)cnt.v_free_count);
548 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_cur =
549 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_max = pageablemem;
550 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = pageablemem / 3;
551 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_max = pageablemem;
552 p->p_cpulimit = RLIM_INFINITY;
553
554 /* Initialize resource accounting structures. */
555 racct_create(&p->p_racct);
556
557 p->p_stats = pstats_alloc();
558
559 /* Allocate a prototype map so we have something to fork. */
560 pmap_pinit0(vmspace_pmap(&vmspace0));
561 p->p_vmspace = &vmspace0;
562 vmspace0.vm_refcnt = 1;
563
564 /*
565 * proc0 is not expected to enter usermode, so there is no special
566 * handling for sv_minuser here, like is done for exec_new_vmspace().
567 */
568 vm_map_init(&vmspace0.vm_map, vmspace_pmap(&vmspace0),
569 p->p_sysent->sv_minuser, p->p_sysent->sv_maxuser);
570
571 /*
572 * Call the init and ctor for the new thread and proc. We wait
573 * to do this until all other structures are fairly sane.
574 */
575 EVENTHANDLER_INVOKE(process_init, p);
576 EVENTHANDLER_INVOKE(thread_init, td);
577 EVENTHANDLER_INVOKE(process_ctor, p);
578 EVENTHANDLER_INVOKE(thread_ctor, td);
579
580 /*
581 * Charge root for one process.
582 */
583 (void)chgproccnt(p->p_ucred->cr_ruidinfo, 1, 0);
584 PROC_LOCK(p);
585 racct_add_force(p, RACCT_NPROC, 1);
586 PROC_UNLOCK(p);
587 }
588 SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL);
589
590 /* ARGSUSED*/
591 static void
592 proc0_post(void *dummy __unused)
593 {
594 struct timespec ts;
595 struct proc *p;
596 struct rusage ru;
597 struct thread *td;
598
599 /*
600 * Now we can look at the time, having had a chance to verify the
601 * time from the filesystem. Pretend that proc0 started now.
602 */
603 sx_slock(&allproc_lock);
604 FOREACH_PROC_IN_SYSTEM(p) {
605 microuptime(&p->p_stats->p_start);
606 PROC_SLOCK(p);
607 rufetch(p, &ru); /* Clears thread stats */
608 PROC_SUNLOCK(p);
609 p->p_rux.rux_runtime = 0;
610 p->p_rux.rux_uticks = 0;
611 p->p_rux.rux_sticks = 0;
612 p->p_rux.rux_iticks = 0;
613 FOREACH_THREAD_IN_PROC(p, td) {
614 td->td_runtime = 0;
615 }
616 }
617 sx_sunlock(&allproc_lock);
618 PCPU_SET(switchtime, cpu_ticks());
619 PCPU_SET(switchticks, ticks);
620
621 /*
622 * Give the ``random'' number generator a thump.
623 */
624 nanotime(&ts);
625 srandom(ts.tv_sec ^ ts.tv_nsec);
626 }
627 SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL);
628
629 static void
630 random_init(void *dummy __unused)
631 {
632
633 /*
634 * After CPU has been started we have some randomness on most
635 * platforms via get_cyclecount(). For platforms that don't
636 * we will reseed random(9) in proc0_post() as well.
637 */
638 srandom(get_cyclecount());
639 }
640 SYSINIT(random, SI_SUB_RANDOM, SI_ORDER_FIRST, random_init, NULL);
641
642 /*
643 ***************************************************************************
644 ****
645 **** The following SYSINIT's and glue code should be moved to the
646 **** respective files on a per subsystem basis.
647 ****
648 ***************************************************************************
649 */
650
651
652 /*
653 ***************************************************************************
654 ****
655 **** The following code probably belongs in another file, like
656 **** kern/init_init.c.
657 ****
658 ***************************************************************************
659 */
660
661 /*
662 * List of paths to try when searching for "init".
663 */
664 static char init_path[MAXPATHLEN] =
665 #ifdef INIT_PATH
666 __XSTRING(INIT_PATH);
667 #else
668 "/sbin/init:/sbin/oinit:/sbin/init.bak:/rescue/init";
669 #endif
670 SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0,
671 "Path used to search the init process");
672
673 /*
674 * Shutdown timeout of init(8).
675 * Unused within kernel, but used to control init(8), hence do not remove.
676 */
677 #ifndef INIT_SHUTDOWN_TIMEOUT
678 #define INIT_SHUTDOWN_TIMEOUT 120
679 #endif
680 static int init_shutdown_timeout = INIT_SHUTDOWN_TIMEOUT;
681 SYSCTL_INT(_kern, OID_AUTO, init_shutdown_timeout,
682 CTLFLAG_RW, &init_shutdown_timeout, 0, "Shutdown timeout of init(8). "
683 "Unused within kernel, but used to control init(8)");
684
685 /*
686 * Start the initial user process; try exec'ing each pathname in init_path.
687 * The program is invoked with one argument containing the boot flags.
688 */
689 static void
690 start_init(void *dummy)
691 {
692 vm_offset_t addr;
693 struct execve_args args;
694 int options, error;
695 char *var, *path, *next, *s;
696 char *ucp, **uap, *arg0, *arg1;
697 struct thread *td;
698 struct proc *p;
699
700 mtx_lock(&Giant);
701
702 GIANT_REQUIRED;
703
704 td = curthread;
705 p = td->td_proc;
706
707 vfs_mountroot();
708
709 /*
710 * Need just enough stack to hold the faked-up "execve()" arguments.
711 */
712 addr = p->p_sysent->sv_usrstack - PAGE_SIZE;
713 if (vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &addr, PAGE_SIZE, 0,
714 VMFS_NO_SPACE, VM_PROT_ALL, VM_PROT_ALL, 0) != 0)
715 panic("init: couldn't allocate argument space");
716 p->p_vmspace->vm_maxsaddr = (caddr_t)addr;
717 p->p_vmspace->vm_ssize = 1;
718
719 if ((var = getenv("init_path")) != NULL) {
720 strlcpy(init_path, var, sizeof(init_path));
721 freeenv(var);
722 }
723
724 for (path = init_path; *path != '\0'; path = next) {
725 while (*path == ':')
726 path++;
727 if (*path == '\0')
728 break;
729 for (next = path; *next != '\0' && *next != ':'; next++)
730 /* nothing */ ;
731 if (bootverbose)
732 printf("start_init: trying %.*s\n", (int)(next - path),
733 path);
734
735 /*
736 * Move out the boot flag argument.
737 */
738 options = 0;
739 ucp = (char *)p->p_sysent->sv_usrstack;
740 (void)subyte(--ucp, 0); /* trailing zero */
741 if (boothowto & RB_SINGLE) {
742 (void)subyte(--ucp, 's');
743 options = 1;
744 }
745 #ifdef notyet
746 if (boothowto & RB_FASTBOOT) {
747 (void)subyte(--ucp, 'f');
748 options = 1;
749 }
750 #endif
751
752 #ifdef BOOTCDROM
753 (void)subyte(--ucp, 'C');
754 options = 1;
755 #endif
756
757 if (options == 0)
758 (void)subyte(--ucp, '-');
759 (void)subyte(--ucp, '-'); /* leading hyphen */
760 arg1 = ucp;
761
762 /*
763 * Move out the file name (also arg 0).
764 */
765 (void)subyte(--ucp, 0);
766 for (s = next - 1; s >= path; s--)
767 (void)subyte(--ucp, *s);
768 arg0 = ucp;
769
770 /*
771 * Move out the arg pointers.
772 */
773 uap = (char **)((intptr_t)ucp & ~(sizeof(intptr_t)-1));
774 (void)suword((caddr_t)--uap, (long)0); /* terminator */
775 (void)suword((caddr_t)--uap, (long)(intptr_t)arg1);
776 (void)suword((caddr_t)--uap, (long)(intptr_t)arg0);
777
778 /*
779 * Point at the arguments.
780 */
781 args.fname = arg0;
782 args.argv = uap;
783 args.envv = NULL;
784
785 /*
786 * Now try to exec the program. If can't for any reason
787 * other than it doesn't exist, complain.
788 *
789 * Otherwise, return via fork_trampoline() all the way
790 * to user mode as init!
791 */
792 if ((error = sys_execve(td, &args)) == 0) {
793 mtx_unlock(&Giant);
794 return;
795 }
796 if (error != ENOENT)
797 printf("exec %.*s: error %d\n", (int)(next - path),
798 path, error);
799 }
800 printf("init: not found in path %s\n", init_path);
801 panic("no init");
802 }
803
804 /*
805 * Like kproc_create(), but runs in it's own address space.
806 * We do this early to reserve pid 1.
807 *
808 * Note special case - do not make it runnable yet. Other work
809 * in progress will change this more.
810 */
811 static void
812 create_init(const void *udata __unused)
813 {
814 struct ucred *newcred, *oldcred;
815 int error;
816
817 error = fork1(&thread0, RFFDG | RFPROC | RFSTOPPED, 0, &initproc,
818 NULL, 0);
819 if (error)
820 panic("cannot fork init: %d\n", error);
821 KASSERT(initproc->p_pid == 1, ("create_init: initproc->p_pid != 1"));
822 /* divorce init's credentials from the kernel's */
823 newcred = crget();
824 PROC_LOCK(initproc);
825 initproc->p_flag |= P_SYSTEM | P_INMEM;
826 oldcred = initproc->p_ucred;
827 crcopy(newcred, oldcred);
828 #ifdef MAC
829 mac_cred_create_init(newcred);
830 #endif
831 #ifdef AUDIT
832 audit_cred_proc1(newcred);
833 #endif
834 initproc->p_ucred = newcred;
835 PROC_UNLOCK(initproc);
836 crfree(oldcred);
837 cred_update_thread(FIRST_THREAD_IN_PROC(initproc));
838 cpu_set_fork_handler(FIRST_THREAD_IN_PROC(initproc), start_init, NULL);
839 }
840 SYSINIT(init, SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL);
841
842 /*
843 * Make it runnable now.
844 */
845 static void
846 kick_init(const void *udata __unused)
847 {
848 struct thread *td;
849
850 td = FIRST_THREAD_IN_PROC(initproc);
851 thread_lock(td);
852 TD_SET_CAN_RUN(td);
853 sched_add(td, SRQ_BORING);
854 thread_unlock(td);
855 }
856 SYSINIT(kickinit, SI_SUB_KTHREAD_INIT, SI_ORDER_FIRST, kick_init, NULL);
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