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/kernel.h>
56 #include <sys/epoch.h>
57 #include <sys/eventhandler.h>
58 #include <sys/exec.h>
59 #include <sys/file.h>
60 #include <sys/filedesc.h>
61 #include <sys/imgact.h>
62 #include <sys/jail.h>
63 #include <sys/ktr.h>
64 #include <sys/lock.h>
65 #include <sys/loginclass.h>
66 #include <sys/mount.h>
67 #include <sys/mutex.h>
68 #include <sys/dtrace_bsd.h>
69 #include <sys/syscallsubr.h>
70 #include <sys/sysctl.h>
71 #include <sys/proc.h>
72 #include <sys/racct.h>
73 #include <sys/resourcevar.h>
74 #include <sys/systm.h>
75 #include <sys/signalvar.h>
76 #include <sys/vnode.h>
77 #include <sys/sysent.h>
78 #include <sys/reboot.h>
79 #include <sys/sched.h>
80 #include <sys/sx.h>
81 #include <sys/sysproto.h>
82 #include <sys/vmmeter.h>
83 #include <sys/unistd.h>
84 #include <sys/malloc.h>
85 #include <sys/conf.h>
86 #include <sys/cpuset.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 struct sysentvec null_sysvec = {
406 .sv_size = 0,
407 .sv_table = NULL,
408 .sv_transtrap = NULL,
409 .sv_fixup = NULL,
410 .sv_sendsig = NULL,
411 .sv_sigcode = NULL,
412 .sv_szsigcode = NULL,
413 .sv_name = "null",
414 .sv_coredump = NULL,
415 .sv_imgact_try = NULL,
416 .sv_minsigstksz = 0,
417 .sv_minuser = VM_MIN_ADDRESS,
418 .sv_maxuser = VM_MAXUSER_ADDRESS,
419 .sv_usrstack = USRSTACK,
420 .sv_psstrings = PS_STRINGS,
421 .sv_stackprot = VM_PROT_ALL,
422 .sv_copyout_strings = NULL,
423 .sv_setregs = NULL,
424 .sv_fixlimit = NULL,
425 .sv_maxssiz = NULL,
426 .sv_flags = 0,
427 .sv_set_syscall_retval = null_set_syscall_retval,
428 .sv_fetch_syscall_args = null_fetch_syscall_args,
429 .sv_syscallnames = NULL,
430 .sv_schedtail = NULL,
431 .sv_thread_detach = NULL,
432 .sv_trap = NULL,
433 };
434
435 /*
436 * The two following SYSINIT's are proc0 specific glue code. I am not
437 * convinced that they can not be safely combined, but their order of
438 * operation has been maintained as the same as the original init_main.c
439 * for right now.
440 */
441 /* ARGSUSED*/
442 static void
443 proc0_init(void *dummy __unused)
444 {
445 struct proc *p;
446 struct thread *td;
447 struct ucred *newcred;
448 struct uidinfo tmpuinfo;
449 struct loginclass tmplc = {
450 .lc_name = "",
451 };
452 vm_paddr_t pageablemem;
453 int i;
454
455 GIANT_REQUIRED;
456 p = &proc0;
457 td = &thread0;
458
459 /*
460 * Initialize magic number and osrel.
461 */
462 p->p_magic = P_MAGIC;
463 p->p_osrel = osreldate;
464
465 /*
466 * Initialize thread and process structures.
467 */
468 procinit(); /* set up proc zone */
469 threadinit(); /* set up UMA zones */
470
471 /*
472 * Initialise scheduler resources.
473 * Add scheduler specific parts to proc, thread as needed.
474 */
475 schedinit(); /* scheduler gets its house in order */
476
477 /*
478 * Create process 0 (the swapper).
479 */
480 LIST_INSERT_HEAD(&allproc, p, p_list);
481 LIST_INSERT_HEAD(PIDHASH(0), p, p_hash);
482 mtx_init(&pgrp0.pg_mtx, "process group", NULL, MTX_DEF | MTX_DUPOK);
483 p->p_pgrp = &pgrp0;
484 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash);
485 LIST_INIT(&pgrp0.pg_members);
486 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist);
487
488 pgrp0.pg_session = &session0;
489 mtx_init(&session0.s_mtx, "session", NULL, MTX_DEF);
490 refcount_init(&session0.s_count, 1);
491 session0.s_leader = p;
492
493 p->p_sysent = &null_sysvec;
494 p->p_flag = P_SYSTEM | P_INMEM | P_KPROC;
495 p->p_flag2 = 0;
496 p->p_state = PRS_NORMAL;
497 p->p_klist = knlist_alloc(&p->p_mtx);
498 STAILQ_INIT(&p->p_ktr);
499 p->p_nice = NZERO;
500 td->td_tid = THREAD0_TID;
501 tidhash_add(td);
502 td->td_state = TDS_RUNNING;
503 td->td_pri_class = PRI_TIMESHARE;
504 td->td_user_pri = PUSER;
505 td->td_base_user_pri = PUSER;
506 td->td_lend_user_pri = PRI_MAX;
507 td->td_priority = PVM;
508 td->td_base_pri = PVM;
509 td->td_oncpu = curcpu;
510 td->td_flags = TDF_INMEM;
511 td->td_pflags = TDP_KTHREAD;
512 td->td_cpuset = cpuset_thread0();
513 td->td_domain.dr_policy = td->td_cpuset->cs_domain;
514 prison0_init();
515 p->p_peers = 0;
516 p->p_leader = p;
517 p->p_reaper = p;
518 p->p_treeflag |= P_TREE_REAPER;
519 LIST_INIT(&p->p_reaplist);
520
521 strncpy(p->p_comm, "kernel", sizeof (p->p_comm));
522 strncpy(td->td_name, "swapper", sizeof (td->td_name));
523
524 callout_init_mtx(&p->p_itcallout, &p->p_mtx, 0);
525 callout_init_mtx(&p->p_limco, &p->p_mtx, 0);
526 callout_init(&td->td_slpcallout, 1);
527
528 /* Create credentials. */
529 newcred = crget();
530 newcred->cr_ngroups = 1; /* group 0 */
531 /* A hack to prevent uifind from tripping over NULL pointers. */
532 curthread->td_ucred = newcred;
533 tmpuinfo.ui_uid = 1;
534 newcred->cr_uidinfo = newcred->cr_ruidinfo = &tmpuinfo;
535 newcred->cr_uidinfo = uifind(0);
536 newcred->cr_ruidinfo = uifind(0);
537 newcred->cr_loginclass = &tmplc;
538 newcred->cr_loginclass = loginclass_find("default");
539 /* End hack. creds get properly set later with thread_cow_get_proc */
540 curthread->td_ucred = NULL;
541 newcred->cr_prison = &prison0;
542 newcred->cr_users++; /* avoid assertion failure */
543 proc_set_cred_init(p, newcred);
544 newcred->cr_users--;
545 crfree(newcred);
546 #ifdef AUDIT
547 audit_cred_kproc0(newcred);
548 #endif
549 #ifdef MAC
550 mac_cred_create_swapper(newcred);
551 #endif
552 /* Create sigacts. */
553 p->p_sigacts = sigacts_alloc();
554
555 /* Initialize signal state for process 0. */
556 siginit(&proc0);
557
558 /* Create the file descriptor table. */
559 p->p_pd = pdinit(NULL, false);
560 p->p_fd = fdinit(NULL, false, NULL);
561 p->p_fdtol = NULL;
562
563 /* Create the limits structures. */
564 p->p_limit = lim_alloc();
565 for (i = 0; i < RLIM_NLIMITS; i++)
566 p->p_limit->pl_rlimit[i].rlim_cur =
567 p->p_limit->pl_rlimit[i].rlim_max = RLIM_INFINITY;
568 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_cur =
569 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles;
570 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_cur =
571 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc;
572 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_cur = dfldsiz;
573 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_max = maxdsiz;
574 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_cur = dflssiz;
575 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_max = maxssiz;
576 /* Cast to avoid overflow on i386/PAE. */
577 pageablemem = ptoa((vm_paddr_t)vm_free_count());
578 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_cur =
579 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_max = pageablemem;
580 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = pageablemem / 3;
581 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_max = pageablemem;
582 p->p_cpulimit = RLIM_INFINITY;
583
584 PROC_LOCK(p);
585 thread_cow_get_proc(td, p);
586 PROC_UNLOCK(p);
587
588 /* Initialize resource accounting structures. */
589 racct_create(&p->p_racct);
590
591 p->p_stats = pstats_alloc();
592
593 /* Allocate a prototype map so we have something to fork. */
594 p->p_vmspace = &vmspace0;
595 refcount_init(&vmspace0.vm_refcnt, 1);
596 pmap_pinit0(vmspace_pmap(&vmspace0));
597
598 /*
599 * proc0 is not expected to enter usermode, so there is no special
600 * handling for sv_minuser here, like is done for exec_new_vmspace().
601 */
602 vm_map_init(&vmspace0.vm_map, vmspace_pmap(&vmspace0),
603 p->p_sysent->sv_minuser, p->p_sysent->sv_maxuser);
604
605 /*
606 * Call the init and ctor for the new thread and proc. We wait
607 * to do this until all other structures are fairly sane.
608 */
609 EVENTHANDLER_DIRECT_INVOKE(process_init, p);
610 EVENTHANDLER_DIRECT_INVOKE(thread_init, td);
611 #ifdef KDTRACE_HOOKS
612 kdtrace_proc_ctor(p);
613 kdtrace_thread_ctor(td);
614 #endif
615 EVENTHANDLER_DIRECT_INVOKE(process_ctor, p);
616 EVENTHANDLER_DIRECT_INVOKE(thread_ctor, td);
617
618 /*
619 * Charge root for one process.
620 */
621 (void)chgproccnt(p->p_ucred->cr_ruidinfo, 1, 0);
622 PROC_LOCK(p);
623 racct_add_force(p, RACCT_NPROC, 1);
624 PROC_UNLOCK(p);
625 }
626 SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL);
627
628 /* ARGSUSED*/
629 static void
630 proc0_post(void *dummy __unused)
631 {
632 struct proc *p;
633 struct rusage ru;
634 struct thread *td;
635
636 /*
637 * Now we can look at the time, having had a chance to verify the
638 * time from the filesystem. Pretend that proc0 started now.
639 */
640 sx_slock(&allproc_lock);
641 FOREACH_PROC_IN_SYSTEM(p) {
642 PROC_LOCK(p);
643 if (p->p_state == PRS_NEW) {
644 PROC_UNLOCK(p);
645 continue;
646 }
647 microuptime(&p->p_stats->p_start);
648 PROC_STATLOCK(p);
649 rufetch(p, &ru); /* Clears thread stats */
650 p->p_rux.rux_runtime = 0;
651 p->p_rux.rux_uticks = 0;
652 p->p_rux.rux_sticks = 0;
653 p->p_rux.rux_iticks = 0;
654 PROC_STATUNLOCK(p);
655 FOREACH_THREAD_IN_PROC(p, td) {
656 td->td_runtime = 0;
657 }
658 PROC_UNLOCK(p);
659 }
660 sx_sunlock(&allproc_lock);
661 PCPU_SET(switchtime, cpu_ticks());
662 PCPU_SET(switchticks, ticks);
663 }
664 SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL);
665
666 /*
667 ***************************************************************************
668 ****
669 **** The following SYSINIT's and glue code should be moved to the
670 **** respective files on a per subsystem basis.
671 ****
672 ***************************************************************************
673 */
674
675 /*
676 * List of paths to try when searching for "init".
677 */
678 static char init_path[MAXPATHLEN] =
679 #ifdef INIT_PATH
680 __XSTRING(INIT_PATH);
681 #else
682 "/sbin/init:/sbin/oinit:/sbin/init.bak:/rescue/init";
683 #endif
684 SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0,
685 "Path used to search the init process");
686
687 /*
688 * Shutdown timeout of init(8).
689 * Unused within kernel, but used to control init(8), hence do not remove.
690 */
691 #ifndef INIT_SHUTDOWN_TIMEOUT
692 #define INIT_SHUTDOWN_TIMEOUT 120
693 #endif
694 static int init_shutdown_timeout = INIT_SHUTDOWN_TIMEOUT;
695 SYSCTL_INT(_kern, OID_AUTO, init_shutdown_timeout,
696 CTLFLAG_RW, &init_shutdown_timeout, 0, "Shutdown timeout of init(8). "
697 "Unused within kernel, but used to control init(8)");
698
699 /*
700 * Start the initial user process; try exec'ing each pathname in init_path.
701 * The program is invoked with one argument containing the boot flags.
702 */
703 static void
704 start_init(void *dummy)
705 {
706 struct image_args args;
707 int error;
708 char *var, *path;
709 char *free_init_path, *tmp_init_path;
710 struct thread *td;
711 struct proc *p;
712 struct vmspace *oldvmspace;
713
714 TSENTER(); /* Here so we don't overlap with mi_startup. */
715
716 td = curthread;
717 p = td->td_proc;
718
719 vfs_mountroot();
720
721 /* Wipe GELI passphrase from the environment. */
722 kern_unsetenv("kern.geom.eli.passphrase");
723
724 /* For Multicons, report which console is primary to both */
725 if (boothowto & RB_MULTIPLE) {
726 if (boothowto & RB_SERIAL)
727 printf("Dual Console: Serial Primary, Video Secondary\n");
728 else
729 printf("Dual Console: Video Primary, Serial Secondary\n");
730 }
731
732 if ((var = kern_getenv("init_path")) != NULL) {
733 strlcpy(init_path, var, sizeof(init_path));
734 freeenv(var);
735 }
736 free_init_path = tmp_init_path = strdup(init_path, M_TEMP);
737
738 while ((path = strsep(&tmp_init_path, ":")) != NULL) {
739 if (bootverbose)
740 printf("start_init: trying %s\n", path);
741
742 memset(&args, 0, sizeof(args));
743 error = exec_alloc_args(&args);
744 if (error != 0)
745 panic("%s: Can't allocate space for init arguments %d",
746 __func__, error);
747
748 error = exec_args_add_fname(&args, path, UIO_SYSSPACE);
749 if (error != 0)
750 panic("%s: Can't add fname %d", __func__, error);
751 error = exec_args_add_arg(&args, path, UIO_SYSSPACE);
752 if (error != 0)
753 panic("%s: Can't add argv[0] %d", __func__, error);
754 if (boothowto & RB_SINGLE)
755 error = exec_args_add_arg(&args, "-s", UIO_SYSSPACE);
756 if (error != 0)
757 panic("%s: Can't add argv[0] %d", __func__, error);
758
759 /*
760 * Now try to exec the program. If can't for any reason
761 * other than it doesn't exist, complain.
762 *
763 * Otherwise, return via fork_trampoline() all the way
764 * to user mode as init!
765 */
766 KASSERT((td->td_pflags & TDP_EXECVMSPC) == 0,
767 ("nested execve"));
768 oldvmspace = td->td_proc->p_vmspace;
769 error = kern_execve(td, &args, NULL, oldvmspace);
770 KASSERT(error != 0,
771 ("kern_execve returned success, not EJUSTRETURN"));
772 if (error == EJUSTRETURN) {
773 exec_cleanup(td, oldvmspace);
774 free(free_init_path, M_TEMP);
775 TSEXIT();
776 return;
777 }
778 if (error != ENOENT)
779 printf("exec %s: error %d\n", path, error);
780 }
781 free(free_init_path, M_TEMP);
782 printf("init: not found in path %s\n", init_path);
783 panic("no init");
784 }
785
786 /*
787 * Like kproc_create(), but runs in its own address space. We do this
788 * early to reserve pid 1. Note special case - do not make it
789 * runnable yet, init execution is started when userspace can be served.
790 */
791 static void
792 create_init(const void *udata __unused)
793 {
794 struct fork_req fr;
795 struct ucred *newcred, *oldcred;
796 struct thread *td;
797 int error;
798
799 bzero(&fr, sizeof(fr));
800 fr.fr_flags = RFFDG | RFPROC | RFSTOPPED;
801 fr.fr_procp = &initproc;
802 error = fork1(&thread0, &fr);
803 if (error)
804 panic("cannot fork init: %d\n", error);
805 KASSERT(initproc->p_pid == 1, ("create_init: initproc->p_pid != 1"));
806 /* divorce init's credentials from the kernel's */
807 newcred = crget();
808 sx_xlock(&proctree_lock);
809 PROC_LOCK(initproc);
810 initproc->p_flag |= P_SYSTEM | P_INMEM;
811 initproc->p_treeflag |= P_TREE_REAPER;
812 oldcred = initproc->p_ucred;
813 crcopy(newcred, oldcred);
814 #ifdef MAC
815 mac_cred_create_init(newcred);
816 #endif
817 #ifdef AUDIT
818 audit_cred_proc1(newcred);
819 #endif
820 proc_set_cred(initproc, newcred);
821 td = FIRST_THREAD_IN_PROC(initproc);
822 crcowfree(td);
823 td->td_realucred = crcowget(initproc->p_ucred);
824 td->td_ucred = td->td_realucred;
825 PROC_UNLOCK(initproc);
826 sx_xunlock(&proctree_lock);
827 crfree(oldcred);
828 cpu_fork_kthread_handler(FIRST_THREAD_IN_PROC(initproc),
829 start_init, NULL);
830 }
831 SYSINIT(init, SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL);
832
833 /*
834 * Make it runnable now.
835 */
836 static void
837 kick_init(const void *udata __unused)
838 {
839 struct thread *td;
840
841 td = FIRST_THREAD_IN_PROC(initproc);
842 thread_lock(td);
843 TD_SET_CAN_RUN(td);
844 sched_add(td, SRQ_BORING);
845 }
846 SYSINIT(kickinit, SI_SUB_KTHREAD_INIT, SI_ORDER_MIDDLE, kick_init, NULL);
847
848 /*
849 * DDB(4).
850 */
851 #ifdef DDB
852 static void
853 db_show_print_syinit(struct sysinit *sip, bool ddb)
854 {
855 const char *sname, *funcname;
856 c_db_sym_t sym;
857 db_expr_t offset;
858
859 #define xprint(...) \
860 if (ddb) \
861 db_printf(__VA_ARGS__); \
862 else \
863 printf(__VA_ARGS__)
864
865 if (sip == NULL) {
866 xprint("%s: no sysinit * given\n", __func__);
867 return;
868 }
869
870 sym = db_search_symbol((vm_offset_t)sip, DB_STGY_ANY, &offset);
871 db_symbol_values(sym, &sname, NULL);
872 sym = db_search_symbol((vm_offset_t)sip->func, DB_STGY_PROC, &offset);
873 db_symbol_values(sym, &funcname, NULL);
874 xprint("%s(%p)\n", (sname != NULL) ? sname : "", sip);
875 xprint(" %#08x %#08x\n", sip->subsystem, sip->order);
876 xprint(" %p(%s)(%p)\n",
877 sip->func, (funcname != NULL) ? funcname : "", sip->udata);
878 #undef xprint
879 }
880
881 DB_SHOW_COMMAND(sysinit, db_show_sysinit)
882 {
883 struct sysinit **sipp;
884
885 db_printf("SYSINIT vs Name(Ptr)\n");
886 db_printf(" Subsystem Order\n");
887 db_printf(" Function(Name)(Arg)\n");
888 for (sipp = sysinit; sipp < sysinit_end; sipp++) {
889 db_show_print_syinit(*sipp, true);
890 if (db_pager_quit)
891 break;
892 }
893 }
894 #endif /* DDB */
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