FreeBSD kernel kern code
init_main.c
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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/boottrace.h>
57#include <sys/conf.h>
58#include <sys/cpuset.h>
59#include <sys/dtrace_bsd.h>
60#include <sys/epoch.h>
61#include <sys/eventhandler.h>
62#include <sys/exec.h>
63#include <sys/file.h>
64#include <sys/filedesc.h>
65#include <sys/imgact.h>
66#include <sys/jail.h>
67#include <sys/kernel.h>
68#include <sys/ktr.h>
69#include <sys/lock.h>
70#include <sys/loginclass.h>
71#include <sys/malloc.h>
72#include <sys/mount.h>
73#include <sys/mutex.h>
74#include <sys/proc.h>
75#include <sys/racct.h>
76#include <sys/reboot.h>
77#include <sys/resourcevar.h>
78#include <sys/sched.h>
79#include <sys/signalvar.h>
80#include <sys/sx.h>
81#include <sys/syscallsubr.h>
82#include <sys/sysctl.h>
83#include <sys/sysent.h>
84#include <sys/sysproto.h>
85#include <sys/unistd.h>
86#include <sys/vmmeter.h>
87#include <sys/vnode.h>
88
89#include <machine/cpu.h>
90
91#include <security/audit/audit.h>
92#include <security/mac/mac_framework.h>
93
94#include <vm/vm.h>
95#include <vm/vm_param.h>
96#include <vm/vm_extern.h>
97#include <vm/pmap.h>
98#include <vm/vm_map.h>
99#include <sys/copyright.h>
100
101#include <ddb/ddb.h>
102#include <ddb/db_sym.h>
103
104void mi_startup(void); /* Should be elsewhere */
105
106/* Components of the first process -- never freed. */
107static struct session session0;
108static struct pgrp pgrp0;
109struct proc proc0;
110struct thread0_storage thread0_st __aligned(32);
111struct vmspace vmspace0;
112struct proc *initproc;
113
114int
115linux_alloc_current_noop(struct thread *td __unused, int flags __unused)
116{
117 return (0);
118}
119int (*lkpi_alloc_current)(struct thread *, int) = linux_alloc_current_noop;
120
121#ifndef BOOTHOWTO
122#define BOOTHOWTO 0
123#endif
124int boothowto = BOOTHOWTO; /* initialized so that it can be patched */
125SYSCTL_INT(_debug, OID_AUTO, boothowto, CTLFLAG_RD, &boothowto, 0,
126 "Boot control flags, passed from loader");
127
128#ifndef BOOTVERBOSE
129#define BOOTVERBOSE 0
130#endif
132SYSCTL_INT(_debug, OID_AUTO, bootverbose, CTLFLAG_RW, &bootverbose, 0,
133 "Control the output of verbose kernel messages");
134
135#ifdef VERBOSE_SYSINIT
136/*
137 * We'll use the defined value of VERBOSE_SYSINIT from the kernel config to
138 * dictate the default VERBOSE_SYSINIT behavior. Significant values for this
139 * option and associated tunable are:
140 * - 0, 'compiled in but silent by default'
141 * - 1, 'compiled in but verbose by default' (default)
142 */
143int verbose_sysinit = VERBOSE_SYSINIT;
144TUNABLE_INT("debug.verbose_sysinit", &verbose_sysinit);
145#endif
146
147#ifdef INVARIANTS
148FEATURE(invariants, "Kernel compiled with INVARIANTS, may affect performance");
149#endif
150
151/*
152 * This ensures that there is at least one entry so that the sysinit_set
153 * symbol is not undefined. A sybsystem ID of SI_SUB_DUMMY is never
154 * executed.
155 */
156SYSINIT(placeholder, SI_SUB_DUMMY, SI_ORDER_ANY, NULL, NULL);
157
158/*
159 * The sysinit table itself. Items are checked off as the are run.
160 * If we want to register new sysinit types, add them to newsysinit.
161 */
162SET_DECLARE(sysinit_set, struct sysinit);
165
166/*
167 * Merge a new sysinit set into the current set, reallocating it if
168 * necessary. This can only be called after malloc is running.
169 */
170void
171sysinit_add(struct sysinit **set, struct sysinit **set_end)
172{
173 struct sysinit **newset;
174 struct sysinit **sipp;
175 struct sysinit **xipp;
176 int count;
177
178 count = set_end - set;
179 if (newsysinit)
181 else
183 newset = malloc(count * sizeof(*sipp), M_TEMP, M_NOWAIT);
184 if (newset == NULL)
185 panic("cannot malloc for sysinit");
186 xipp = newset;
187 if (newsysinit)
188 for (sipp = newsysinit; sipp < newsysinit_end; sipp++)
189 *xipp++ = *sipp;
190 else
191 for (sipp = sysinit; sipp < sysinit_end; sipp++)
192 *xipp++ = *sipp;
193 for (sipp = set; sipp < set_end; sipp++)
194 *xipp++ = *sipp;
195 if (newsysinit)
196 free(newsysinit, M_TEMP);
197 newsysinit = newset;
198 newsysinit_end = newset + count;
199}
200
201#if defined (DDB) && defined(VERBOSE_SYSINIT)
202static const char *
203symbol_name(vm_offset_t va, db_strategy_t strategy)
204{
205 const char *name;
206 c_db_sym_t sym;
207 db_expr_t offset;
208
209 if (va == 0)
210 return (NULL);
211 sym = db_search_symbol(va, strategy, &offset);
212 if (offset != 0)
213 return (NULL);
214 db_symbol_values(sym, &name, NULL);
215 return (name);
216}
217#endif
218
219/*
220 * System startup; initialize the world, create process 0, mount root
221 * filesystem, and fork to create init and pagedaemon. Most of the
222 * hard work is done in the lower-level initialization routines including
223 * startup(), which does memory initialization and autoconfiguration.
224 *
225 * This allows simple addition of new kernel subsystems that require
226 * boot time initialization. It also allows substitution of subsystem
227 * (for instance, a scheduler, kernel profiler, or VM system) by object
228 * module. Finally, it allows for optional "kernel threads".
229 */
230void
232{
233
234 struct sysinit **sipp; /* system initialization*/
235 struct sysinit **xipp; /* interior loop of sort*/
236 struct sysinit *save; /* bubble*/
237
238 int last;
239#if defined(VERBOSE_SYSINIT)
240 int verbose;
241#endif
242
243 TSENTER();
244
245 if (boothowto & RB_VERBOSE)
246 bootverbose++;
247
248 if (sysinit == NULL) {
249 sysinit = SET_BEGIN(sysinit_set);
250 sysinit_end = SET_LIMIT(sysinit_set);
251 }
252
253restart:
254 /*
255 * Perform a bubble sort of the system initialization objects by
256 * their subsystem (primary key) and order (secondary key).
257 */
258 for (sipp = sysinit; sipp < sysinit_end; sipp++) {
259 for (xipp = sipp + 1; xipp < sysinit_end; xipp++) {
260 if ((*sipp)->subsystem < (*xipp)->subsystem ||
261 ((*sipp)->subsystem == (*xipp)->subsystem &&
262 (*sipp)->order <= (*xipp)->order))
263 continue; /* skip*/
264 save = *sipp;
265 *sipp = *xipp;
266 *xipp = save;
267 }
268 }
269
270 last = SI_SUB_COPYRIGHT;
271#if defined(VERBOSE_SYSINIT)
272 verbose = 0;
273#if !defined(DDB)
274 printf("VERBOSE_SYSINIT: DDB not enabled, symbol lookups disabled.\n");
275#endif
276#endif
277
278 /*
279 * Traverse the (now) ordered list of system initialization tasks.
280 * Perform each task, and continue on to the next task.
281 */
282 for (sipp = sysinit; sipp < sysinit_end; sipp++) {
283 if ((*sipp)->subsystem == SI_SUB_DUMMY)
284 continue; /* skip dummy task(s)*/
285
286 if ((*sipp)->subsystem == SI_SUB_DONE)
287 continue;
288
289 if ((*sipp)->subsystem > last)
290 BOOTTRACE_INIT("sysinit 0x%7x", (*sipp)->subsystem);
291
292#if defined(VERBOSE_SYSINIT)
293 if ((*sipp)->subsystem > last && verbose_sysinit != 0) {
294 verbose = 1;
295 printf("subsystem %x\n", last);
296 }
297 if (verbose) {
298#if defined(DDB)
299 const char *func, *data;
300
301 func = symbol_name((vm_offset_t)(*sipp)->func,
302 DB_STGY_PROC);
303 data = symbol_name((vm_offset_t)(*sipp)->udata,
304 DB_STGY_ANY);
305 if (func != NULL && data != NULL)
306 printf(" %s(&%s)... ", func, data);
307 else if (func != NULL)
308 printf(" %s(%p)... ", func, (*sipp)->udata);
309 else
310#endif
311 printf(" %p(%p)... ", (*sipp)->func,
312 (*sipp)->udata);
313 }
314#endif
315
316 /* Call function */
317 (*((*sipp)->func))((*sipp)->udata);
318
319#if defined(VERBOSE_SYSINIT)
320 if (verbose)
321 printf("done.\n");
322#endif
323
324 /* Check off the one we're just done */
325 last = (*sipp)->subsystem;
326 (*sipp)->subsystem = SI_SUB_DONE;
327
328 /* Check if we've installed more sysinit items via KLD */
329 if (newsysinit != NULL) {
330 if (sysinit != SET_BEGIN(sysinit_set))
331 free(sysinit, M_TEMP);
334 newsysinit = NULL;
335 newsysinit_end = NULL;
336 goto restart;
337 }
338 }
339
340 TSEXIT(); /* Here so we don't overlap with start_init. */
341 BOOTTRACE("mi_startup done");
342
343 mtx_assert(&Giant, MA_OWNED | MA_NOTRECURSED);
344 mtx_unlock(&Giant);
345
346 /*
347 * Now hand over this thread to swapper.
348 */
349 swapper();
350 /* NOTREACHED*/
351}
352
353static void
355{
356 printf("%s", (char *)data);
357}
358
359static void
360print_version(void *data __unused)
361{
362 int len;
363
364 /* Strip a trailing newline from version. */
365 len = strlen(version);
366 while (len > 0 && version[len - 1] == '\n')
367 len--;
368 printf("%.*s %s\n", len, version, machine);
369 printf("%s\n", compiler_version);
370}
371
372SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t,
373 copyright);
374SYSINIT(trademark, SI_SUB_COPYRIGHT, SI_ORDER_SECOND, print_caddr_t,
375 trademark);
376SYSINIT(version, SI_SUB_COPYRIGHT, SI_ORDER_THIRD, print_version, NULL);
377
378#ifdef WITNESS
379static char wit_warn[] =
380 "WARNING: WITNESS option enabled, expect reduced performance.\n";
381SYSINIT(witwarn, SI_SUB_COPYRIGHT, SI_ORDER_FOURTH,
382 print_caddr_t, wit_warn);
383SYSINIT(witwarn2, SI_SUB_LAST, SI_ORDER_FOURTH,
384 print_caddr_t, wit_warn);
385#endif
386
387#ifdef DIAGNOSTIC
388static char diag_warn[] =
389 "WARNING: DIAGNOSTIC option enabled, expect reduced performance.\n";
390SYSINIT(diagwarn, SI_SUB_COPYRIGHT, SI_ORDER_FIFTH,
391 print_caddr_t, diag_warn);
392SYSINIT(diagwarn2, SI_SUB_LAST, SI_ORDER_FIFTH,
393 print_caddr_t, diag_warn);
394#endif
395
396static int
397null_fetch_syscall_args(struct thread *td __unused)
398{
399
400 panic("null_fetch_syscall_args");
401}
402
403static void
404null_set_syscall_retval(struct thread *td __unused, int error __unused)
405{
406
407 panic("null_set_syscall_retval");
408}
409
410static void
411null_set_fork_retval(struct thread *td __unused)
412{
413
414}
415
416struct sysentvec null_sysvec = {
417 .sv_size = 0,
418 .sv_table = NULL,
419 .sv_transtrap = NULL,
420 .sv_fixup = NULL,
421 .sv_sendsig = NULL,
422 .sv_sigcode = NULL,
423 .sv_szsigcode = NULL,
424 .sv_name = "null",
425 .sv_coredump = NULL,
426 .sv_imgact_try = NULL,
427 .sv_minsigstksz = 0,
428 .sv_minuser = VM_MIN_ADDRESS,
429 .sv_maxuser = VM_MAXUSER_ADDRESS,
430 .sv_usrstack = USRSTACK,
431 .sv_psstrings = PS_STRINGS,
432 .sv_psstringssz = sizeof(struct ps_strings),
433 .sv_stackprot = VM_PROT_ALL,
434 .sv_copyout_strings = NULL,
435 .sv_setregs = NULL,
436 .sv_fixlimit = NULL,
437 .sv_maxssiz = NULL,
438 .sv_flags = 0,
439 .sv_set_syscall_retval = null_set_syscall_retval,
440 .sv_fetch_syscall_args = null_fetch_syscall_args,
441 .sv_syscallnames = NULL,
442 .sv_schedtail = NULL,
443 .sv_thread_detach = NULL,
444 .sv_trap = NULL,
445 .sv_set_fork_retval = null_set_fork_retval,
446 .sv_regset_begin = NULL,
447 .sv_regset_end = NULL,
448};
449
450/*
451 * The two following SYSINIT's are proc0 specific glue code. I am not
452 * convinced that they can not be safely combined, but their order of
453 * operation has been maintained as the same as the original init_main.c
454 * for right now.
455 */
456/* ARGSUSED*/
457static void
458proc0_init(void *dummy __unused)
459{
460 struct proc *p;
461 struct thread *td;
462 struct ucred *newcred;
463 struct uidinfo tmpuinfo;
464 struct loginclass tmplc = {
465 .lc_name = "",
466 };
467 vm_paddr_t pageablemem;
468 int i;
469
470 GIANT_REQUIRED;
471 p = &proc0;
472 td = &thread0;
473
474 /*
475 * Initialize magic number and osrel.
476 */
477 p->p_magic = P_MAGIC;
478 p->p_osrel = osreldate;
479
480 /*
481 * Initialize thread and process structures.
482 */
483 procinit(); /* set up proc zone */
484 threadinit(); /* set up UMA zones */
485
486 /*
487 * Initialise scheduler resources.
488 * Add scheduler specific parts to proc, thread as needed.
489 */
490 schedinit(); /* scheduler gets its house in order */
491
492 /*
493 * Create process 0 (the swapper).
494 */
495 LIST_INSERT_HEAD(&allproc, p, p_list);
496 LIST_INSERT_HEAD(PIDHASH(0), p, p_hash);
497 mtx_init(&pgrp0.pg_mtx, "process group", NULL, MTX_DEF | MTX_DUPOK);
498 p->p_pgrp = &pgrp0;
499 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash);
500 LIST_INIT(&pgrp0.pg_members);
501 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist);
502
503 pgrp0.pg_session = &session0;
504 mtx_init(&session0.s_mtx, "session", NULL, MTX_DEF);
505 refcount_init(&session0.s_count, 1);
506 session0.s_leader = p;
507
508 p->p_sysent = &null_sysvec;
509 p->p_flag = P_SYSTEM | P_INMEM | P_KPROC;
510 p->p_flag2 = 0;
511 p->p_state = PRS_NORMAL;
512 p->p_klist = knlist_alloc(&p->p_mtx);
513 STAILQ_INIT(&p->p_ktr);
514 p->p_nice = NZERO;
515 td->td_tid = THREAD0_TID;
516 tidhash_add(td);
517 TD_SET_STATE(td, TDS_RUNNING);
518 td->td_pri_class = PRI_TIMESHARE;
519 td->td_user_pri = PUSER;
520 td->td_base_user_pri = PUSER;
521 td->td_lend_user_pri = PRI_MAX;
522 td->td_priority = PVM;
523 td->td_base_pri = PVM;
524 td->td_oncpu = curcpu;
525 td->td_flags = TDF_INMEM;
526 td->td_pflags = TDP_KTHREAD;
527 td->td_cpuset = cpuset_thread0();
528 td->td_domain.dr_policy = td->td_cpuset->cs_domain;
529 prison0_init();
530 p->p_peers = 0;
531 p->p_leader = p;
532 p->p_reaper = p;
533 p->p_treeflag |= P_TREE_REAPER;
534 LIST_INIT(&p->p_reaplist);
535
536 strncpy(p->p_comm, "kernel", sizeof (p->p_comm));
537 strncpy(td->td_name, "swapper", sizeof (td->td_name));
538
539 callout_init_mtx(&p->p_itcallout, &p->p_mtx, 0);
540 callout_init_mtx(&p->p_limco, &p->p_mtx, 0);
541 callout_init(&td->td_slpcallout, 1);
542 TAILQ_INIT(&p->p_kqtim_stop);
543
544 /* Create credentials. */
545 newcred = crget();
546 newcred->cr_ngroups = 1; /* group 0 */
547 /* A hack to prevent uifind from tripping over NULL pointers. */
548 curthread->td_ucred = newcred;
549 tmpuinfo.ui_uid = 1;
550 newcred->cr_uidinfo = newcred->cr_ruidinfo = &tmpuinfo;
551 newcred->cr_uidinfo = uifind(0);
552 newcred->cr_ruidinfo = uifind(0);
553 newcred->cr_loginclass = &tmplc;
554 newcred->cr_loginclass = loginclass_find("default");
555 /* End hack. creds get properly set later with thread_cow_get_proc */
556 curthread->td_ucred = NULL;
557 newcred->cr_prison = &prison0;
558 newcred->cr_users++; /* avoid assertion failure */
559 proc_set_cred_init(p, newcred);
560 newcred->cr_users--;
561 crfree(newcred);
562#ifdef AUDIT
563 audit_cred_kproc0(newcred);
564#endif
565#ifdef MAC
566 mac_cred_create_swapper(newcred);
567#endif
568 /* Create sigacts. */
569 p->p_sigacts = sigacts_alloc();
570
571 /* Initialize signal state for process 0. */
572 siginit(&proc0);
573
574 /* Create the file descriptor table. */
575 p->p_pd = pdinit(NULL, false);
576 p->p_fd = fdinit();
577 p->p_fdtol = NULL;
578
579 /* Create the limits structures. */
580 p->p_limit = lim_alloc();
581 for (i = 0; i < RLIM_NLIMITS; i++)
582 p->p_limit->pl_rlimit[i].rlim_cur =
583 p->p_limit->pl_rlimit[i].rlim_max = RLIM_INFINITY;
584 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_cur =
585 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles;
586 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_cur =
587 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc;
588 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_cur = dfldsiz;
589 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_max = maxdsiz;
590 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_cur = dflssiz;
591 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_max = maxssiz;
592 /* Cast to avoid overflow on i386/PAE. */
593 pageablemem = ptoa((vm_paddr_t)vm_free_count());
594 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_cur =
595 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_max = pageablemem;
596 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = pageablemem / 3;
597 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_max = pageablemem;
598 p->p_cpulimit = RLIM_INFINITY;
599
600 PROC_LOCK(p);
601 thread_cow_get_proc(td, p);
602 PROC_UNLOCK(p);
603
604 /* Initialize resource accounting structures. */
605 racct_create(&p->p_racct);
606
607 p->p_stats = pstats_alloc();
608
609 /* Allocate a prototype map so we have something to fork. */
610 p->p_vmspace = &vmspace0;
611 refcount_init(&vmspace0.vm_refcnt, 1);
612 pmap_pinit0(vmspace_pmap(&vmspace0));
613
614 /*
615 * proc0 is not expected to enter usermode, so there is no special
616 * handling for sv_minuser here, like is done for exec_new_vmspace().
617 */
618 vm_map_init(&vmspace0.vm_map, vmspace_pmap(&vmspace0),
619 p->p_sysent->sv_minuser, p->p_sysent->sv_maxuser);
620
621 /*
622 * Call the init and ctor for the new thread and proc. We wait
623 * to do this until all other structures are fairly sane.
624 */
625 EVENTHANDLER_DIRECT_INVOKE(process_init, p);
626 EVENTHANDLER_DIRECT_INVOKE(thread_init, td);
627#ifdef KDTRACE_HOOKS
630#endif
631 EVENTHANDLER_DIRECT_INVOKE(process_ctor, p);
632 EVENTHANDLER_DIRECT_INVOKE(thread_ctor, td);
633
634 /*
635 * Charge root for one process.
636 */
637 (void)chgproccnt(p->p_ucred->cr_ruidinfo, 1, 0);
638 PROC_LOCK(p);
639 racct_add_force(p, RACCT_NPROC, 1);
640 PROC_UNLOCK(p);
641}
642SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL);
643
644/* ARGSUSED*/
645static void
646proc0_post(void *dummy __unused)
647{
648 struct proc *p;
649 struct rusage ru;
650 struct thread *td;
651
652 /*
653 * Now we can look at the time, having had a chance to verify the
654 * time from the filesystem. Pretend that proc0 started now.
655 */
656 sx_slock(&allproc_lock);
657 FOREACH_PROC_IN_SYSTEM(p) {
658 PROC_LOCK(p);
659 if (p->p_state == PRS_NEW) {
660 PROC_UNLOCK(p);
661 continue;
662 }
663 microuptime(&p->p_stats->p_start);
664 PROC_STATLOCK(p);
665 rufetch(p, &ru); /* Clears thread stats */
666 p->p_rux.rux_runtime = 0;
667 p->p_rux.rux_uticks = 0;
668 p->p_rux.rux_sticks = 0;
669 p->p_rux.rux_iticks = 0;
670 PROC_STATUNLOCK(p);
671 FOREACH_THREAD_IN_PROC(p, td) {
672 td->td_runtime = 0;
673 }
674 PROC_UNLOCK(p);
675 }
676 sx_sunlock(&allproc_lock);
677 PCPU_SET(switchtime, cpu_ticks());
678 PCPU_SET(switchticks, ticks);
679}
680SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL);
681
682/*
683 ***************************************************************************
684 ****
685 **** The following SYSINIT's and glue code should be moved to the
686 **** respective files on a per subsystem basis.
687 ****
688 ***************************************************************************
689 */
690
691/*
692 * List of paths to try when searching for "init".
693 */
694static char init_path[MAXPATHLEN] =
695#ifdef INIT_PATH
696 __XSTRING(INIT_PATH);
697#else
698 "/sbin/init:/sbin/oinit:/sbin/init.bak:/rescue/init";
699#endif
700SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0,
701 "Path used to search the init process");
702
703/*
704 * Shutdown timeout of init(8).
705 * Unused within kernel, but used to control init(8), hence do not remove.
706 */
707#ifndef INIT_SHUTDOWN_TIMEOUT
708#define INIT_SHUTDOWN_TIMEOUT 120
709#endif
712 CTLFLAG_RW, &init_shutdown_timeout, 0, "Shutdown timeout of init(8). "
713 "Unused within kernel, but used to control init(8)");
714
715/*
716 * Start the initial user process; try exec'ing each pathname in init_path.
717 * The program is invoked with one argument containing the boot flags.
718 */
719static void
721{
722 struct image_args args;
723 int error;
724 char *var, *path;
725 char *free_init_path, *tmp_init_path;
726 struct thread *td;
727 struct proc *p;
728 struct vmspace *oldvmspace;
729
730 TSENTER(); /* Here so we don't overlap with mi_startup. */
731
732 td = curthread;
733 p = td->td_proc;
734
736
737 /* Wipe GELI passphrase from the environment. */
738 kern_unsetenv("kern.geom.eli.passphrase");
739
740 /* For Multicons, report which console is primary to both */
741 if (boothowto & RB_MULTIPLE) {
742 if (boothowto & RB_SERIAL)
743 printf("Dual Console: Serial Primary, Video Secondary\n");
744 else
745 printf("Dual Console: Video Primary, Serial Secondary\n");
746 }
747
748 if ((var = kern_getenv("init_path")) != NULL) {
749 strlcpy(init_path, var, sizeof(init_path));
750 freeenv(var);
751 }
752 free_init_path = tmp_init_path = strdup(init_path, M_TEMP);
753
754 while ((path = strsep(&tmp_init_path, ":")) != NULL) {
755 if (bootverbose)
756 printf("start_init: trying %s\n", path);
757
758 memset(&args, 0, sizeof(args));
759 error = exec_alloc_args(&args);
760 if (error != 0)
761 panic("%s: Can't allocate space for init arguments %d",
762 __func__, error);
763
764 error = exec_args_add_fname(&args, path, UIO_SYSSPACE);
765 if (error != 0)
766 panic("%s: Can't add fname %d", __func__, error);
767 error = exec_args_add_arg(&args, path, UIO_SYSSPACE);
768 if (error != 0)
769 panic("%s: Can't add argv[0] %d", __func__, error);
770 if (boothowto & RB_SINGLE)
771 error = exec_args_add_arg(&args, "-s", UIO_SYSSPACE);
772 if (error != 0)
773 panic("%s: Can't add argv[0] %d", __func__, error);
774
775 /*
776 * Now try to exec the program. If can't for any reason
777 * other than it doesn't exist, complain.
778 *
779 * Otherwise, return via fork_trampoline() all the way
780 * to user mode as init!
781 */
782 KASSERT((td->td_pflags & TDP_EXECVMSPC) == 0,
783 ("nested execve"));
784 oldvmspace = p->p_vmspace;
785 error = kern_execve(td, &args, NULL, oldvmspace);
786 KASSERT(error != 0,
787 ("kern_execve returned success, not EJUSTRETURN"));
788 if (error == EJUSTRETURN) {
789 exec_cleanup(td, oldvmspace);
790 free(free_init_path, M_TEMP);
791 TSEXIT();
792 return;
793 }
794 if (error != ENOENT)
795 printf("exec %s: error %d\n", path, error);
796 }
797 free(free_init_path, M_TEMP);
798 printf("init: not found in path %s\n", init_path);
799 panic("no init");
800}
801
802/*
803 * Like kproc_create(), but runs in its own address space. We do this
804 * early to reserve pid 1. Note special case - do not make it
805 * runnable yet, init execution is started when userspace can be served.
806 */
807static void
808create_init(const void *udata __unused)
809{
810 struct fork_req fr;
811 struct ucred *newcred, *oldcred;
812 struct thread *td;
813 int error;
814
815 bzero(&fr, sizeof(fr));
816 fr.fr_flags = RFFDG | RFPROC | RFSTOPPED;
817 fr.fr_procp = &initproc;
818 error = fork1(&thread0, &fr);
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 sx_xlock(&proctree_lock);
825 PROC_LOCK(initproc);
826 initproc->p_flag |= P_SYSTEM | P_INMEM;
827 initproc->p_treeflag |= P_TREE_REAPER;
828 oldcred = initproc->p_ucred;
829 crcopy(newcred, oldcred);
830#ifdef MAC
831 mac_cred_create_init(newcred);
832#endif
833#ifdef AUDIT
834 audit_cred_proc1(newcred);
835#endif
836 proc_set_cred(initproc, newcred);
837 td = FIRST_THREAD_IN_PROC(initproc);
838 crcowfree(td);
839 td->td_realucred = crcowget(initproc->p_ucred);
840 td->td_ucred = td->td_realucred;
841 PROC_UNLOCK(initproc);
842 sx_xunlock(&proctree_lock);
843 crfree(oldcred);
844 cpu_fork_kthread_handler(FIRST_THREAD_IN_PROC(initproc),
845 start_init, NULL);
846}
847SYSINIT(init, SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL);
848
849/*
850 * Make it runnable now.
851 */
852static void
853kick_init(const void *udata __unused)
854{
855 struct thread *td;
856
857 td = FIRST_THREAD_IN_PROC(initproc);
858 thread_lock(td);
859 TD_SET_CAN_RUN(td);
860 sched_add(td, SRQ_BORING);
861}
862SYSINIT(kickinit, SI_SUB_KTHREAD_INIT, SI_ORDER_MIDDLE, kick_init, NULL);
863
864/*
865 * DDB(4).
866 */
867#ifdef DDB
868static void
869db_show_print_syinit(struct sysinit *sip, bool ddb)
870{
871 const char *sname, *funcname;
872 c_db_sym_t sym;
873 db_expr_t offset;
874
875#define xprint(...) \
876 if (ddb) \
877 db_printf(__VA_ARGS__); \
878 else \
879 printf(__VA_ARGS__)
880
881 if (sip == NULL) {
882 xprint("%s: no sysinit * given\n", __func__);
883 return;
884 }
885
886 sym = db_search_symbol((vm_offset_t)sip, DB_STGY_ANY, &offset);
887 db_symbol_values(sym, &sname, NULL);
888 sym = db_search_symbol((vm_offset_t)sip->func, DB_STGY_PROC, &offset);
889 db_symbol_values(sym, &funcname, NULL);
890 xprint("%s(%p)\n", (sname != NULL) ? sname : "", sip);
891 xprint(" %#08x %#08x\n", sip->subsystem, sip->order);
892 xprint(" %p(%s)(%p)\n",
893 sip->func, (funcname != NULL) ? funcname : "", sip->udata);
894#undef xprint
895}
896
897DB_SHOW_COMMAND(sysinit, db_show_sysinit)
898{
899 struct sysinit **sipp;
900
901 db_printf("SYSINIT vs Name(Ptr)\n");
902 db_printf(" Subsystem Order\n");
903 db_printf(" Function(Name)(Arg)\n");
904 for (sipp = sysinit; sipp < sysinit_end; sipp++) {
905 db_show_print_syinit(*sipp, true);
906 if (db_pager_quit)
907 break;
908 }
909}
910#endif /* DDB */
METHOD int set
Definition: cpufreq_if.m:43
int * count
Definition: cpufreq_if.m:63
const char * name
Definition: kern_fail.c:145
static int init_shutdown_timeout
Definition: init_main.c:710
static void create_init(const void *udata __unused)
Definition: init_main.c:808
struct vmspace vmspace0
Definition: init_main.c:111
void sysinit_add(struct sysinit **set, struct sysinit **set_end)
Definition: init_main.c:171
static void null_set_fork_retval(struct thread *td __unused)
Definition: init_main.c:411
static char init_path[MAXPATHLEN]
Definition: init_main.c:694
struct sysinit ** sysinit
Definition: init_main.c:163
static int null_fetch_syscall_args(struct thread *td __unused)
Definition: init_main.c:397
#define BOOTVERBOSE
Definition: init_main.c:129
static void print_caddr_t(void *data)
Definition: init_main.c:354
static void kick_init(const void *udata __unused)
Definition: init_main.c:853
static void start_init(void *dummy)
Definition: init_main.c:720
static void proc0_post(void *dummy __unused)
Definition: init_main.c:646
struct sysinit ** newsysinit_end
Definition: init_main.c:164
SYSCTL_INT(_debug, OID_AUTO, boothowto, CTLFLAG_RD, &boothowto, 0, "Boot control flags, passed from loader")
static struct session session0
Definition: init_main.c:107
static void print_version(void *data __unused)
Definition: init_main.c:360
static struct pgrp pgrp0
Definition: init_main.c:108
struct sysentvec null_sysvec
Definition: init_main.c:416
struct sysinit ** sysinit_end
Definition: init_main.c:163
__FBSDID("$FreeBSD$")
#define BOOTHOWTO
Definition: init_main.c:122
struct thread0_storage thread0_st __aligned(32)
struct sysinit ** newsysinit
Definition: init_main.c:164
int(* lkpi_alloc_current)(struct thread *, int)
Definition: init_main.c:119
int boothowto
Definition: init_main.c:124
static void null_set_syscall_retval(struct thread *td __unused, int error __unused)
Definition: init_main.c:404
int bootverbose
Definition: init_main.c:131
SYSINIT(placeholder, SI_SUB_DUMMY, SI_ORDER_ANY, NULL, NULL)
int linux_alloc_current_noop(struct thread *td __unused, int flags __unused)
Definition: init_main.c:115
SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0, "Path used to search the init process")
void mi_startup(void)
Definition: init_main.c:231
static void proc0_init(void *dummy __unused)
Definition: init_main.c:458
struct proc proc0
Definition: init_main.c:109
struct proc * initproc
Definition: init_main.c:112
#define INIT_SHUTDOWN_TIMEOUT
Definition: init_main.c:708
SET_DECLARE(sysinit_set, struct sysinit)
volatile int ticks
Definition: kern_clock.c:380
TUNABLE_INT("kern.eventtimer.periodic", &want_periodic)
struct cpuset * cpuset_thread0(void)
Definition: kern_cpuset.c:1602
struct pwddesc * pdinit(struct pwddesc *pdp, bool keeplock)
struct filedesc * fdinit(void)
void kdtrace_proc_ctor(struct proc *p)
Definition: kern_dtrace.c:71
FEATURE(kdtrace_hooks, "Kernel DTrace hooks which are required to load DTrace kernel modules")
void kdtrace_thread_ctor(struct thread *td)
Definition: kern_dtrace.c:94
void freeenv(char *env)
char * kern_getenv(const char *name)
int kern_unsetenv(const char *name)
struct knlist * knlist_alloc(struct mtx *lock)
Definition: kern_event.c:2571
void exec_cleanup(struct thread *td, struct vmspace *oldvmspace)
Definition: kern_exec.c:1028
int kern_execve(struct thread *td, struct image_args *args, struct mac *mac_p, struct vmspace *oldvmspace)
Definition: kern_exec.c:350
int exec_args_add_arg(struct image_args *args, const char *argp, enum uio_seg segflg)
Definition: kern_exec.c:1548
int exec_args_add_fname(struct image_args *args, const char *fname, enum uio_seg segflg)
Definition: kern_exec.c:1494
int exec_alloc_args(struct image_args *args)
Definition: kern_exec.c:1458
int fork1(struct thread *td, struct fork_req *fr)
Definition: kern_fork.c:853
struct prison prison0
Definition: kern_jail.c:101
void prison0_init(void)
Definition: kern_jail.c:239
struct loginclass * loginclass_find(const char *name)
void *() malloc(size_t size, struct malloc_type *mtp, int flags)
Definition: kern_malloc.c:632
void free(void *addr, struct malloc_type *mtp)
Definition: kern_malloc.c:907
struct mtx __exclusive_cache_line Giant
Definition: kern_mutex.c:181
void procinit(void)
Definition: kern_proc.c:182
struct pstats * pstats_alloc(void)
Definition: kern_proc.c:1343
struct sx __exclusive_cache_line proctree_lock
Definition: kern_proc.c:135
struct proclist allproc
Definition: kern_proc.c:133
struct sx __exclusive_cache_line allproc_lock
Definition: kern_proc.c:134
struct ucred * crget(void)
Definition: kern_prot.c:1991
void crcopy(struct ucred *dest, struct ucred *src)
Definition: kern_prot.c:2100
struct ucred * crcowget(struct ucred *cr)
Definition: kern_prot.c:1854
void proc_set_cred(struct proc *p, struct ucred *newcred)
Definition: kern_prot.c:2181
void proc_set_cred_init(struct proc *p, struct ucred *newcred)
Definition: kern_prot.c:2164
void crfree(struct ucred *cr)
Definition: kern_prot.c:2035
void crcowfree(struct thread *td)
Definition: kern_prot.c:1918
void rufetch(struct proc *p, struct rusage *ru)
struct plimit * lim_alloc()
struct uidinfo * uifind(uid_t uid)
int chgproccnt(struct uidinfo *uip, int diff, rlim_t max)
void panic(const char *fmt,...)
struct sigacts * sigacts_alloc(void)
Definition: kern_sig.c:4119
void siginit(struct proc *p)
Definition: kern_sig.c:963
cpu_tick_f * cpu_ticks
Definition: kern_tc.c:2174
void microuptime(struct timeval *tvp)
Definition: kern_tc.c:406
void tidhash_add(struct thread *td)
Definition: kern_thread.c:1763
void thread_cow_get_proc(struct thread *newtd, struct proc *p)
Definition: kern_thread.c:820
static int thread_init(void *mem, int size, int flags)
Definition: kern_thread.c:418
void threadinit(void)
Definition: kern_thread.c:488
static int thread_ctor(void *mem, int size, void *arg, int flags)
Definition: kern_thread.c:345
void callout_init(struct callout *c, int mpsafe)
c_linker_sym_t sym
Definition: linker_if.m:51
uint32_t * data
Definition: msi_if.m:90
void schedinit(void)
Definition: sched_4bsd.c:670
void sched_add(struct thread *td, int flags)
Definition: sched_4bsd.c:1285
u_long maxssiz
Definition: subr_param.c:109
int maxproc
Definition: subr_param.c:90
u_long dfldsiz
Definition: subr_param.c:106
int maxfiles
Definition: subr_param.c:92
u_long dflssiz
Definition: subr_param.c:108
u_long maxdsiz
Definition: subr_param.c:107
int printf(const char *fmt,...)
Definition: subr_prf.c:397
uint16_t flags
Definition: subr_stats.c:2
static int dummy
const char * path
Definition: vfs_extattr.c:715
void vfs_mountroot(void)