FreeBSD/Linux Kernel Cross Reference
sys/kern/init_main.c
1 /*-
2 * SPDX-License-Identifier: BSD-4-Clause
3 *
4 * Copyright (c) 1995 Terrence R. Lambert
5 * All rights reserved.
6 *
7 * Copyright (c) 1982, 1986, 1989, 1991, 1992, 1993
8 * The Regents of the University of California. All rights reserved.
9 * (c) UNIX System Laboratories, Inc.
10 * All or some portions of this file are derived from material licensed
11 * to the University of California by American Telephone and Telegraph
12 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
13 * the permission of UNIX System Laboratories, Inc.
14 *
15 * Redistribution and use in source and binary forms, with or without
16 * modification, are permitted provided that the following conditions
17 * are met:
18 * 1. Redistributions of source code must retain the above copyright
19 * notice, this list of conditions and the following disclaimer.
20 * 2. Redistributions in binary form must reproduce the above copyright
21 * notice, this list of conditions and the following disclaimer in the
22 * documentation and/or other materials provided with the distribution.
23 * 3. All advertising materials mentioning features or use of this software
24 * must display the following acknowledgement:
25 * This product includes software developed by the University of
26 * California, Berkeley and its contributors.
27 * 4. Neither the name of the University nor the names of its contributors
28 * may be used to endorse or promote products derived from this software
29 * without specific prior written permission.
30 *
31 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
32 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
33 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
34 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
35 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
39 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
40 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
41 * SUCH DAMAGE.
42 *
43 * @(#)init_main.c 8.9 (Berkeley) 1/21/94
44 */
45
46 #include <sys/cdefs.h>
47 __FBSDID("$FreeBSD$");
48
49 #include "opt_ddb.h"
50 #include "opt_kdb.h"
51 #include "opt_init_path.h"
52 #include "opt_verbose_sysinit.h"
53
54 #include <sys/param.h>
55 #include <sys/systm.h>
56 #include <sys/conf.h>
57 #include <sys/cpuset.h>
58 #include <sys/dtrace_bsd.h>
59 #include <sys/epoch.h>
60 #include <sys/eventhandler.h>
61 #include <sys/exec.h>
62 #include <sys/file.h>
63 #include <sys/filedesc.h>
64 #include <sys/imgact.h>
65 #include <sys/jail.h>
66 #include <sys/kernel.h>
67 #include <sys/ktr.h>
68 #include <sys/lock.h>
69 #include <sys/loginclass.h>
70 #include <sys/malloc.h>
71 #include <sys/mount.h>
72 #include <sys/mutex.h>
73 #include <sys/proc.h>
74 #include <sys/racct.h>
75 #include <sys/reboot.h>
76 #include <sys/resourcevar.h>
77 #include <sys/sched.h>
78 #include <sys/signalvar.h>
79 #include <sys/sx.h>
80 #include <sys/syscallsubr.h>
81 #include <sys/sysctl.h>
82 #include <sys/sysent.h>
83 #include <sys/sysproto.h>
84 #include <sys/unistd.h>
85 #include <sys/vmmeter.h>
86 #include <sys/vnode.h>
87
88 #include <machine/cpu.h>
89
90 #include <security/audit/audit.h>
91 #include <security/mac/mac_framework.h>
92
93 #include <vm/vm.h>
94 #include <vm/vm_param.h>
95 #include <vm/vm_extern.h>
96 #include <vm/pmap.h>
97 #include <vm/vm_map.h>
98 #include <sys/copyright.h>
99
100 #include <ddb/ddb.h>
101 #include <ddb/db_sym.h>
102
103 void mi_startup(void); /* Should be elsewhere */
104
105 /* Components of the first process -- never freed. */
106 static struct session session0;
107 static struct pgrp pgrp0;
108 struct proc proc0;
109 struct thread0_storage thread0_st __aligned(32);
110 struct vmspace vmspace0;
111 struct proc *initproc;
112
113 int
114 linux_alloc_current_noop(struct thread *td __unused, int flags __unused)
115 {
116 return (0);
117 }
118 int (*lkpi_alloc_current)(struct thread *, int) = linux_alloc_current_noop;
119
120 #ifndef BOOTHOWTO
121 #define BOOTHOWTO 0
122 #endif
123 int boothowto = BOOTHOWTO; /* initialized so that it can be patched */
124 SYSCTL_INT(_debug, OID_AUTO, boothowto, CTLFLAG_RD, &boothowto, 0,
125 "Boot control flags, passed from loader");
126
127 #ifndef BOOTVERBOSE
128 #define BOOTVERBOSE 0
129 #endif
130 int bootverbose = BOOTVERBOSE;
131 SYSCTL_INT(_debug, OID_AUTO, bootverbose, CTLFLAG_RW, &bootverbose, 0,
132 "Control the output of verbose kernel messages");
133
134 #ifdef VERBOSE_SYSINIT
135 /*
136 * We'll use the defined value of VERBOSE_SYSINIT from the kernel config to
137 * dictate the default VERBOSE_SYSINIT behavior. Significant values for this
138 * option and associated tunable are:
139 * - 0, 'compiled in but silent by default'
140 * - 1, 'compiled in but verbose by default' (default)
141 */
142 int verbose_sysinit = VERBOSE_SYSINIT;
143 TUNABLE_INT("debug.verbose_sysinit", &verbose_sysinit);
144 #endif
145
146 #ifdef INVARIANTS
147 FEATURE(invariants, "Kernel compiled with INVARIANTS, may affect performance");
148 #endif
149
150 /*
151 * This ensures that there is at least one entry so that the sysinit_set
152 * symbol is not undefined. A sybsystem ID of SI_SUB_DUMMY is never
153 * executed.
154 */
155 SYSINIT(placeholder, SI_SUB_DUMMY, SI_ORDER_ANY, NULL, NULL);
156
157 /*
158 * The sysinit table itself. Items are checked off as the are run.
159 * If we want to register new sysinit types, add them to newsysinit.
160 */
161 SET_DECLARE(sysinit_set, struct sysinit);
162 struct sysinit **sysinit, **sysinit_end;
163 struct sysinit **newsysinit, **newsysinit_end;
164
165 /*
166 * Merge a new sysinit set into the current set, reallocating it if
167 * necessary. This can only be called after malloc is running.
168 */
169 void
170 sysinit_add(struct sysinit **set, struct sysinit **set_end)
171 {
172 struct sysinit **newset;
173 struct sysinit **sipp;
174 struct sysinit **xipp;
175 int count;
176
177 count = set_end - set;
178 if (newsysinit)
179 count += newsysinit_end - newsysinit;
180 else
181 count += sysinit_end - sysinit;
182 newset = malloc(count * sizeof(*sipp), M_TEMP, M_NOWAIT);
183 if (newset == NULL)
184 panic("cannot malloc for sysinit");
185 xipp = newset;
186 if (newsysinit)
187 for (sipp = newsysinit; sipp < newsysinit_end; sipp++)
188 *xipp++ = *sipp;
189 else
190 for (sipp = sysinit; sipp < sysinit_end; sipp++)
191 *xipp++ = *sipp;
192 for (sipp = set; sipp < set_end; sipp++)
193 *xipp++ = *sipp;
194 if (newsysinit)
195 free(newsysinit, M_TEMP);
196 newsysinit = newset;
197 newsysinit_end = newset + count;
198 }
199
200 #if defined (DDB) && defined(VERBOSE_SYSINIT)
201 static const char *
202 symbol_name(vm_offset_t va, db_strategy_t strategy)
203 {
204 const char *name;
205 c_db_sym_t sym;
206 db_expr_t offset;
207
208 if (va == 0)
209 return (NULL);
210 sym = db_search_symbol(va, strategy, &offset);
211 if (offset != 0)
212 return (NULL);
213 db_symbol_values(sym, &name, NULL);
214 return (name);
215 }
216 #endif
217
218 /*
219 * System startup; initialize the world, create process 0, mount root
220 * filesystem, and fork to create init and pagedaemon. Most of the
221 * hard work is done in the lower-level initialization routines including
222 * startup(), which does memory initialization and autoconfiguration.
223 *
224 * This allows simple addition of new kernel subsystems that require
225 * boot time initialization. It also allows substitution of subsystem
226 * (for instance, a scheduler, kernel profiler, or VM system) by object
227 * module. Finally, it allows for optional "kernel threads".
228 */
229 void
230 mi_startup(void)
231 {
232
233 struct sysinit **sipp; /* system initialization*/
234 struct sysinit **xipp; /* interior loop of sort*/
235 struct sysinit *save; /* bubble*/
236
237 #if defined(VERBOSE_SYSINIT)
238 int last;
239 int verbose;
240 #endif
241
242 TSENTER();
243
244 if (boothowto & RB_VERBOSE)
245 bootverbose++;
246
247 if (sysinit == NULL) {
248 sysinit = SET_BEGIN(sysinit_set);
249 sysinit_end = SET_LIMIT(sysinit_set);
250 }
251
252 restart:
253 /*
254 * Perform a bubble sort of the system initialization objects by
255 * their subsystem (primary key) and order (secondary key).
256 */
257 for (sipp = sysinit; sipp < sysinit_end; sipp++) {
258 for (xipp = sipp + 1; xipp < sysinit_end; xipp++) {
259 if ((*sipp)->subsystem < (*xipp)->subsystem ||
260 ((*sipp)->subsystem == (*xipp)->subsystem &&
261 (*sipp)->order <= (*xipp)->order))
262 continue; /* skip*/
263 save = *sipp;
264 *sipp = *xipp;
265 *xipp = save;
266 }
267 }
268
269 #if defined(VERBOSE_SYSINIT)
270 last = SI_SUB_COPYRIGHT;
271 verbose = 0;
272 #if !defined(DDB)
273 printf("VERBOSE_SYSINIT: DDB not enabled, symbol lookups disabled.\n");
274 #endif
275 #endif
276
277 /*
278 * Traverse the (now) ordered list of system initialization tasks.
279 * Perform each task, and continue on to the next task.
280 */
281 for (sipp = sysinit; sipp < sysinit_end; sipp++) {
282 if ((*sipp)->subsystem == SI_SUB_DUMMY)
283 continue; /* skip dummy task(s)*/
284
285 if ((*sipp)->subsystem == SI_SUB_DONE)
286 continue;
287
288 #if defined(VERBOSE_SYSINIT)
289 if ((*sipp)->subsystem > last && verbose_sysinit != 0) {
290 verbose = 1;
291 last = (*sipp)->subsystem;
292 printf("subsystem %x\n", last);
293 }
294 if (verbose) {
295 #if defined(DDB)
296 const char *func, *data;
297
298 func = symbol_name((vm_offset_t)(*sipp)->func,
299 DB_STGY_PROC);
300 data = symbol_name((vm_offset_t)(*sipp)->udata,
301 DB_STGY_ANY);
302 if (func != NULL && data != NULL)
303 printf(" %s(&%s)... ", func, data);
304 else if (func != NULL)
305 printf(" %s(%p)... ", func, (*sipp)->udata);
306 else
307 #endif
308 printf(" %p(%p)... ", (*sipp)->func,
309 (*sipp)->udata);
310 }
311 #endif
312
313 /* Call function */
314 (*((*sipp)->func))((*sipp)->udata);
315
316 #if defined(VERBOSE_SYSINIT)
317 if (verbose)
318 printf("done.\n");
319 #endif
320
321 /* Check off the one we're just done */
322 (*sipp)->subsystem = SI_SUB_DONE;
323
324 /* Check if we've installed more sysinit items via KLD */
325 if (newsysinit != NULL) {
326 if (sysinit != SET_BEGIN(sysinit_set))
327 free(sysinit, M_TEMP);
328 sysinit = newsysinit;
329 sysinit_end = newsysinit_end;
330 newsysinit = NULL;
331 newsysinit_end = NULL;
332 goto restart;
333 }
334 }
335
336 TSEXIT(); /* Here so we don't overlap with start_init. */
337
338 mtx_assert(&Giant, MA_OWNED | MA_NOTRECURSED);
339 mtx_unlock(&Giant);
340
341 /*
342 * Now hand over this thread to swapper.
343 */
344 swapper();
345 /* NOTREACHED*/
346 }
347
348 static void
349 print_caddr_t(void *data)
350 {
351 printf("%s", (char *)data);
352 }
353
354 static void
355 print_version(void *data __unused)
356 {
357 int len;
358
359 /* Strip a trailing newline from version. */
360 len = strlen(version);
361 while (len > 0 && version[len - 1] == '\n')
362 len--;
363 printf("%.*s %s\n", len, version, machine);
364 printf("%s\n", compiler_version);
365 }
366
367 SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t,
368 copyright);
369 SYSINIT(trademark, SI_SUB_COPYRIGHT, SI_ORDER_SECOND, print_caddr_t,
370 trademark);
371 SYSINIT(version, SI_SUB_COPYRIGHT, SI_ORDER_THIRD, print_version, NULL);
372
373 #ifdef WITNESS
374 static char wit_warn[] =
375 "WARNING: WITNESS option enabled, expect reduced performance.\n";
376 SYSINIT(witwarn, SI_SUB_COPYRIGHT, SI_ORDER_FOURTH,
377 print_caddr_t, wit_warn);
378 SYSINIT(witwarn2, SI_SUB_LAST, SI_ORDER_FOURTH,
379 print_caddr_t, wit_warn);
380 #endif
381
382 #ifdef DIAGNOSTIC
383 static char diag_warn[] =
384 "WARNING: DIAGNOSTIC option enabled, expect reduced performance.\n";
385 SYSINIT(diagwarn, SI_SUB_COPYRIGHT, SI_ORDER_FIFTH,
386 print_caddr_t, diag_warn);
387 SYSINIT(diagwarn2, SI_SUB_LAST, SI_ORDER_FIFTH,
388 print_caddr_t, diag_warn);
389 #endif
390
391 static int
392 null_fetch_syscall_args(struct thread *td __unused)
393 {
394
395 panic("null_fetch_syscall_args");
396 }
397
398 static void
399 null_set_syscall_retval(struct thread *td __unused, int error __unused)
400 {
401
402 panic("null_set_syscall_retval");
403 }
404
405 static void
406 null_set_fork_retval(struct thread *td __unused)
407 {
408
409 }
410
411 struct sysentvec null_sysvec = {
412 .sv_size = 0,
413 .sv_table = NULL,
414 .sv_fixup = NULL,
415 .sv_sendsig = NULL,
416 .sv_sigcode = NULL,
417 .sv_szsigcode = NULL,
418 .sv_name = "null",
419 .sv_coredump = NULL,
420 .sv_imgact_try = NULL,
421 .sv_minsigstksz = 0,
422 .sv_minuser = VM_MIN_ADDRESS,
423 .sv_maxuser = VM_MAXUSER_ADDRESS,
424 .sv_usrstack = USRSTACK,
425 .sv_psstrings = PS_STRINGS,
426 .sv_psstringssz = sizeof(struct ps_strings),
427 .sv_stackprot = VM_PROT_ALL,
428 .sv_copyout_strings = NULL,
429 .sv_setregs = NULL,
430 .sv_fixlimit = NULL,
431 .sv_maxssiz = NULL,
432 .sv_flags = 0,
433 .sv_set_syscall_retval = null_set_syscall_retval,
434 .sv_fetch_syscall_args = null_fetch_syscall_args,
435 .sv_syscallnames = NULL,
436 .sv_schedtail = NULL,
437 .sv_thread_detach = NULL,
438 .sv_trap = NULL,
439 .sv_regset_begin = NULL,
440 .sv_regset_end = NULL,
441 .sv_set_fork_retval = null_set_fork_retval,
442 };
443
444 /*
445 * The two following SYSINIT's are proc0 specific glue code. I am not
446 * convinced that they can not be safely combined, but their order of
447 * operation has been maintained as the same as the original init_main.c
448 * for right now.
449 */
450 /* ARGSUSED*/
451 static void
452 proc0_init(void *dummy __unused)
453 {
454 struct proc *p;
455 struct thread *td;
456 struct ucred *newcred;
457 struct uidinfo tmpuinfo;
458 struct loginclass tmplc = {
459 .lc_name = "",
460 };
461 vm_paddr_t pageablemem;
462 int i;
463
464 GIANT_REQUIRED;
465 p = &proc0;
466 td = &thread0;
467
468 /*
469 * Initialize magic number and osrel.
470 */
471 p->p_magic = P_MAGIC;
472 p->p_osrel = osreldate;
473
474 /*
475 * Initialize thread and process structures.
476 */
477 procinit(); /* set up proc zone */
478 threadinit(); /* set up UMA zones */
479
480 /*
481 * Initialise scheduler resources.
482 * Add scheduler specific parts to proc, thread as needed.
483 */
484 schedinit(); /* scheduler gets its house in order */
485
486 /*
487 * Create process 0 (the swapper).
488 */
489 LIST_INSERT_HEAD(&allproc, p, p_list);
490 LIST_INSERT_HEAD(PIDHASH(0), p, p_hash);
491 mtx_init(&pgrp0.pg_mtx, "process group", NULL, MTX_DEF | MTX_DUPOK);
492 p->p_pgrp = &pgrp0;
493 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash);
494 LIST_INIT(&pgrp0.pg_members);
495 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist);
496
497 pgrp0.pg_session = &session0;
498 mtx_init(&session0.s_mtx, "session", NULL, MTX_DEF);
499 refcount_init(&session0.s_count, 1);
500 session0.s_leader = p;
501
502 p->p_sysent = &null_sysvec;
503 p->p_flag = P_SYSTEM | P_INMEM | P_KPROC;
504 p->p_flag2 = 0;
505 p->p_state = PRS_NORMAL;
506 p->p_klist = knlist_alloc(&p->p_mtx);
507 STAILQ_INIT(&p->p_ktr);
508 p->p_nice = NZERO;
509 td->td_tid = THREAD0_TID;
510 tidhash_add(td);
511 td->td_state = TDS_RUNNING;
512 td->td_pri_class = PRI_TIMESHARE;
513 td->td_user_pri = PUSER;
514 td->td_base_user_pri = PUSER;
515 td->td_lend_user_pri = PRI_MAX;
516 td->td_priority = PVM;
517 td->td_base_pri = PVM;
518 td->td_oncpu = curcpu;
519 td->td_flags = TDF_INMEM;
520 td->td_pflags = TDP_KTHREAD;
521 td->td_cpuset = cpuset_thread0();
522 td->td_domain.dr_policy = td->td_cpuset->cs_domain;
523 prison0_init();
524 p->p_peers = 0;
525 p->p_leader = p;
526 p->p_reaper = p;
527 p->p_treeflag |= P_TREE_REAPER;
528 LIST_INIT(&p->p_reaplist);
529
530 strncpy(p->p_comm, "kernel", sizeof (p->p_comm));
531 strncpy(td->td_name, "swapper", sizeof (td->td_name));
532
533 callout_init_mtx(&p->p_itcallout, &p->p_mtx, 0);
534 callout_init_mtx(&p->p_limco, &p->p_mtx, 0);
535 callout_init(&td->td_slpcallout, 1);
536 TAILQ_INIT(&p->p_kqtim_stop);
537
538 /* Create credentials. */
539 newcred = crget();
540 newcred->cr_ngroups = 1; /* group 0 */
541 /* A hack to prevent uifind from tripping over NULL pointers. */
542 curthread->td_ucred = newcred;
543 tmpuinfo.ui_uid = 1;
544 newcred->cr_uidinfo = newcred->cr_ruidinfo = &tmpuinfo;
545 newcred->cr_uidinfo = uifind(0);
546 newcred->cr_ruidinfo = uifind(0);
547 newcred->cr_loginclass = &tmplc;
548 newcred->cr_loginclass = loginclass_find("default");
549 /* End hack. creds get properly set later with thread_cow_get_proc */
550 curthread->td_ucred = NULL;
551 newcred->cr_prison = &prison0;
552 newcred->cr_users++; /* avoid assertion failure */
553 proc_set_cred_init(p, newcred);
554 newcred->cr_users--;
555 crfree(newcred);
556 #ifdef AUDIT
557 audit_cred_kproc0(newcred);
558 #endif
559 #ifdef MAC
560 mac_cred_create_swapper(newcred);
561 #endif
562 /* Create sigacts. */
563 p->p_sigacts = sigacts_alloc();
564
565 /* Initialize signal state for process 0. */
566 siginit(&proc0);
567
568 /* Create the file descriptor table. */
569 p->p_pd = pdinit(NULL, false);
570 p->p_fd = fdinit(NULL, false, NULL);
571 p->p_fdtol = NULL;
572
573 /* Create the limits structures. */
574 p->p_limit = lim_alloc();
575 for (i = 0; i < RLIM_NLIMITS; i++)
576 p->p_limit->pl_rlimit[i].rlim_cur =
577 p->p_limit->pl_rlimit[i].rlim_max = RLIM_INFINITY;
578 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_cur =
579 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles;
580 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_cur =
581 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc;
582 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_cur = dfldsiz;
583 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_max = maxdsiz;
584 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_cur = dflssiz;
585 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_max = maxssiz;
586 /* Cast to avoid overflow on i386/PAE. */
587 pageablemem = ptoa((vm_paddr_t)vm_free_count());
588 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_cur =
589 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_max = pageablemem;
590 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = pageablemem / 3;
591 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_max = pageablemem;
592 p->p_cpulimit = RLIM_INFINITY;
593
594 PROC_LOCK(p);
595 thread_cow_get_proc(td, p);
596 PROC_UNLOCK(p);
597
598 /* Initialize resource accounting structures. */
599 racct_create(&p->p_racct);
600
601 p->p_stats = pstats_alloc();
602
603 /* Allocate a prototype map so we have something to fork. */
604 p->p_vmspace = &vmspace0;
605 refcount_init(&vmspace0.vm_refcnt, 1);
606 pmap_pinit0(vmspace_pmap(&vmspace0));
607
608 /*
609 * proc0 is not expected to enter usermode, so there is no special
610 * handling for sv_minuser here, like is done for exec_new_vmspace().
611 */
612 vm_map_init(&vmspace0.vm_map, vmspace_pmap(&vmspace0),
613 p->p_sysent->sv_minuser, p->p_sysent->sv_maxuser);
614
615 /*
616 * Call the init and ctor for the new thread and proc. We wait
617 * to do this until all other structures are fairly sane.
618 */
619 EVENTHANDLER_DIRECT_INVOKE(process_init, p);
620 EVENTHANDLER_DIRECT_INVOKE(thread_init, td);
621 #ifdef KDTRACE_HOOKS
622 kdtrace_proc_ctor(p);
623 kdtrace_thread_ctor(td);
624 #endif
625 EVENTHANDLER_DIRECT_INVOKE(process_ctor, p);
626 EVENTHANDLER_DIRECT_INVOKE(thread_ctor, td);
627
628 /*
629 * Charge root for one process.
630 */
631 (void)chgproccnt(p->p_ucred->cr_ruidinfo, 1, 0);
632 PROC_LOCK(p);
633 racct_add_force(p, RACCT_NPROC, 1);
634 PROC_UNLOCK(p);
635 }
636 SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL);
637
638 /* ARGSUSED*/
639 static void
640 proc0_post(void *dummy __unused)
641 {
642 struct proc *p;
643 struct rusage ru;
644 struct thread *td;
645
646 /*
647 * Now we can look at the time, having had a chance to verify the
648 * time from the filesystem. Pretend that proc0 started now.
649 */
650 sx_slock(&allproc_lock);
651 FOREACH_PROC_IN_SYSTEM(p) {
652 PROC_LOCK(p);
653 if (p->p_state == PRS_NEW) {
654 PROC_UNLOCK(p);
655 continue;
656 }
657 microuptime(&p->p_stats->p_start);
658 PROC_STATLOCK(p);
659 rufetch(p, &ru); /* Clears thread stats */
660 p->p_rux.rux_runtime = 0;
661 p->p_rux.rux_uticks = 0;
662 p->p_rux.rux_sticks = 0;
663 p->p_rux.rux_iticks = 0;
664 PROC_STATUNLOCK(p);
665 FOREACH_THREAD_IN_PROC(p, td) {
666 td->td_runtime = 0;
667 }
668 PROC_UNLOCK(p);
669 }
670 sx_sunlock(&allproc_lock);
671 PCPU_SET(switchtime, cpu_ticks());
672 PCPU_SET(switchticks, ticks);
673 }
674 SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL);
675
676 /*
677 ***************************************************************************
678 ****
679 **** The following SYSINIT's and glue code should be moved to the
680 **** respective files on a per subsystem basis.
681 ****
682 ***************************************************************************
683 */
684
685 /*
686 * List of paths to try when searching for "init".
687 */
688 static char init_path[MAXPATHLEN] =
689 #ifdef INIT_PATH
690 __XSTRING(INIT_PATH);
691 #else
692 "/sbin/init:/sbin/oinit:/sbin/init.bak:/rescue/init";
693 #endif
694 SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0,
695 "Path used to search the init process");
696
697 /*
698 * Shutdown timeout of init(8).
699 * Unused within kernel, but used to control init(8), hence do not remove.
700 */
701 #ifndef INIT_SHUTDOWN_TIMEOUT
702 #define INIT_SHUTDOWN_TIMEOUT 120
703 #endif
704 static int init_shutdown_timeout = INIT_SHUTDOWN_TIMEOUT;
705 SYSCTL_INT(_kern, OID_AUTO, init_shutdown_timeout,
706 CTLFLAG_RW, &init_shutdown_timeout, 0, "Shutdown timeout of init(8). "
707 "Unused within kernel, but used to control init(8)");
708
709 /*
710 * Start the initial user process; try exec'ing each pathname in init_path.
711 * The program is invoked with one argument containing the boot flags.
712 */
713 static void
714 start_init(void *dummy)
715 {
716 struct image_args args;
717 int error;
718 char *var, *path;
719 char *free_init_path, *tmp_init_path;
720 struct thread *td;
721 struct proc *p;
722 struct vmspace *oldvmspace;
723
724 TSENTER(); /* Here so we don't overlap with mi_startup. */
725
726 td = curthread;
727 p = td->td_proc;
728
729 vfs_mountroot();
730
731 /* Wipe GELI passphrase from the environment. */
732 kern_unsetenv("kern.geom.eli.passphrase");
733
734 /* For Multicons, report which console is primary to both */
735 if (boothowto & RB_MULTIPLE) {
736 if (boothowto & RB_SERIAL)
737 printf("Dual Console: Serial Primary, Video Secondary\n");
738 else
739 printf("Dual Console: Video Primary, Serial Secondary\n");
740 }
741
742 if ((var = kern_getenv("init_path")) != NULL) {
743 strlcpy(init_path, var, sizeof(init_path));
744 freeenv(var);
745 }
746 free_init_path = tmp_init_path = strdup(init_path, M_TEMP);
747
748 while ((path = strsep(&tmp_init_path, ":")) != NULL) {
749 if (bootverbose)
750 printf("start_init: trying %s\n", path);
751
752 memset(&args, 0, sizeof(args));
753 error = exec_alloc_args(&args);
754 if (error != 0)
755 panic("%s: Can't allocate space for init arguments %d",
756 __func__, error);
757
758 error = exec_args_add_fname(&args, path, UIO_SYSSPACE);
759 if (error != 0)
760 panic("%s: Can't add fname %d", __func__, error);
761 error = exec_args_add_arg(&args, path, UIO_SYSSPACE);
762 if (error != 0)
763 panic("%s: Can't add argv[0] %d", __func__, error);
764 if (boothowto & RB_SINGLE)
765 error = exec_args_add_arg(&args, "-s", UIO_SYSSPACE);
766 if (error != 0)
767 panic("%s: Can't add argv[0] %d", __func__, error);
768
769 /*
770 * Now try to exec the program. If can't for any reason
771 * other than it doesn't exist, complain.
772 *
773 * Otherwise, return via fork_trampoline() all the way
774 * to user mode as init!
775 */
776 KASSERT((td->td_pflags & TDP_EXECVMSPC) == 0,
777 ("nested execve"));
778 oldvmspace = p->p_vmspace;
779 error = kern_execve(td, &args, NULL, oldvmspace);
780 KASSERT(error != 0,
781 ("kern_execve returned success, not EJUSTRETURN"));
782 if (error == EJUSTRETURN) {
783 exec_cleanup(td, oldvmspace);
784 free(free_init_path, M_TEMP);
785 TSEXIT();
786 return;
787 }
788 if (error != ENOENT)
789 printf("exec %s: error %d\n", path, error);
790 }
791 free(free_init_path, M_TEMP);
792 printf("init: not found in path %s\n", init_path);
793 panic("no init");
794 }
795
796 /*
797 * Like kproc_create(), but runs in its own address space. We do this
798 * early to reserve pid 1. Note special case - do not make it
799 * runnable yet, init execution is started when userspace can be served.
800 */
801 static void
802 create_init(const void *udata __unused)
803 {
804 struct fork_req fr;
805 struct ucred *newcred, *oldcred;
806 struct thread *td;
807 int error;
808
809 bzero(&fr, sizeof(fr));
810 fr.fr_flags = RFFDG | RFPROC | RFSTOPPED;
811 fr.fr_procp = &initproc;
812 error = fork1(&thread0, &fr);
813 if (error)
814 panic("cannot fork init: %d\n", error);
815 KASSERT(initproc->p_pid == 1, ("create_init: initproc->p_pid != 1"));
816 /* divorce init's credentials from the kernel's */
817 newcred = crget();
818 sx_xlock(&proctree_lock);
819 PROC_LOCK(initproc);
820 initproc->p_flag |= P_SYSTEM | P_INMEM;
821 initproc->p_treeflag |= P_TREE_REAPER;
822 oldcred = initproc->p_ucred;
823 crcopy(newcred, oldcred);
824 #ifdef MAC
825 mac_cred_create_init(newcred);
826 #endif
827 #ifdef AUDIT
828 audit_cred_proc1(newcred);
829 #endif
830 proc_set_cred(initproc, newcred);
831 td = FIRST_THREAD_IN_PROC(initproc);
832 crcowfree(td);
833 td->td_realucred = crcowget(initproc->p_ucred);
834 td->td_ucred = td->td_realucred;
835 PROC_UNLOCK(initproc);
836 sx_xunlock(&proctree_lock);
837 crfree(oldcred);
838 cpu_fork_kthread_handler(FIRST_THREAD_IN_PROC(initproc),
839 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 }
856 SYSINIT(kickinit, SI_SUB_KTHREAD_INIT, SI_ORDER_MIDDLE, kick_init, NULL);
857
858 /*
859 * DDB(4).
860 */
861 #ifdef DDB
862 static void
863 db_show_print_syinit(struct sysinit *sip, bool ddb)
864 {
865 const char *sname, *funcname;
866 c_db_sym_t sym;
867 db_expr_t offset;
868
869 #define xprint(...) \
870 if (ddb) \
871 db_printf(__VA_ARGS__); \
872 else \
873 printf(__VA_ARGS__)
874
875 if (sip == NULL) {
876 xprint("%s: no sysinit * given\n", __func__);
877 return;
878 }
879
880 sym = db_search_symbol((vm_offset_t)sip, DB_STGY_ANY, &offset);
881 db_symbol_values(sym, &sname, NULL);
882 sym = db_search_symbol((vm_offset_t)sip->func, DB_STGY_PROC, &offset);
883 db_symbol_values(sym, &funcname, NULL);
884 xprint("%s(%p)\n", (sname != NULL) ? sname : "", sip);
885 xprint(" %#08x %#08x\n", sip->subsystem, sip->order);
886 xprint(" %p(%s)(%p)\n",
887 sip->func, (funcname != NULL) ? funcname : "", sip->udata);
888 #undef xprint
889 }
890
891 DB_SHOW_COMMAND(sysinit, db_show_sysinit)
892 {
893 struct sysinit **sipp;
894
895 db_printf("SYSINIT vs Name(Ptr)\n");
896 db_printf(" Subsystem Order\n");
897 db_printf(" Function(Name)(Arg)\n");
898 for (sipp = sysinit; sipp < sysinit_end; sipp++) {
899 db_show_print_syinit(*sipp, true);
900 if (db_pager_quit)
901 break;
902 }
903 }
904 #endif /* DDB */
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