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: releng/12.0/sys/kern/init_main.c 335993 2018-07-05 16:16:28Z bz $");
48
49 #include "opt_ddb.h"
50 #include "opt_init_path.h"
51 #include "opt_verbose_sysinit.h"
52
53 #include <sys/param.h>
54 #include <sys/kernel.h>
55 #include <sys/exec.h>
56 #include <sys/file.h>
57 #include <sys/filedesc.h>
58 #include <sys/jail.h>
59 #include <sys/ktr.h>
60 #include <sys/lock.h>
61 #include <sys/loginclass.h>
62 #include <sys/mount.h>
63 #include <sys/mutex.h>
64 #include <sys/syscallsubr.h>
65 #include <sys/sysctl.h>
66 #include <sys/proc.h>
67 #include <sys/racct.h>
68 #include <sys/resourcevar.h>
69 #include <sys/systm.h>
70 #include <sys/signalvar.h>
71 #include <sys/vnode.h>
72 #include <sys/sysent.h>
73 #include <sys/reboot.h>
74 #include <sys/sched.h>
75 #include <sys/sx.h>
76 #include <sys/sysproto.h>
77 #include <sys/vmmeter.h>
78 #include <sys/unistd.h>
79 #include <sys/malloc.h>
80 #include <sys/conf.h>
81 #include <sys/cpuset.h>
82
83 #include <machine/cpu.h>
84
85 #include <security/audit/audit.h>
86 #include <security/mac/mac_framework.h>
87
88 #include <vm/vm.h>
89 #include <vm/vm_param.h>
90 #include <vm/vm_extern.h>
91 #include <vm/pmap.h>
92 #include <vm/vm_map.h>
93 #include <sys/copyright.h>
94
95 #include <ddb/ddb.h>
96 #include <ddb/db_sym.h>
97
98 void mi_startup(void); /* Should be elsewhere */
99
100 /* Components of the first process -- never freed. */
101 static struct session session0;
102 static struct pgrp pgrp0;
103 struct proc proc0;
104 struct thread0_storage thread0_st __aligned(32);
105 struct vmspace vmspace0;
106 struct proc *initproc;
107
108 #ifndef BOOTHOWTO
109 #define BOOTHOWTO 0
110 #endif
111 int boothowto = BOOTHOWTO; /* initialized so that it can be patched */
112 SYSCTL_INT(_debug, OID_AUTO, boothowto, CTLFLAG_RD, &boothowto, 0,
113 "Boot control flags, passed from loader");
114
115 #ifndef BOOTVERBOSE
116 #define BOOTVERBOSE 0
117 #endif
118 int bootverbose = BOOTVERBOSE;
119 SYSCTL_INT(_debug, OID_AUTO, bootverbose, CTLFLAG_RW, &bootverbose, 0,
120 "Control the output of verbose kernel messages");
121
122 #ifdef VERBOSE_SYSINIT
123 /*
124 * We'll use the defined value of VERBOSE_SYSINIT from the kernel config to
125 * dictate the default VERBOSE_SYSINIT behavior. Significant values for this
126 * option and associated tunable are:
127 * - 0, 'compiled in but silent by default'
128 * - 1, 'compiled in but verbose by default' (default)
129 */
130 int verbose_sysinit = VERBOSE_SYSINIT;
131 TUNABLE_INT("debug.verbose_sysinit", &verbose_sysinit);
132 #endif
133
134 #ifdef INVARIANTS
135 FEATURE(invariants, "Kernel compiled with INVARIANTS, may affect performance");
136 #endif
137
138 /*
139 * This ensures that there is at least one entry so that the sysinit_set
140 * symbol is not undefined. A sybsystem ID of SI_SUB_DUMMY is never
141 * executed.
142 */
143 SYSINIT(placeholder, SI_SUB_DUMMY, SI_ORDER_ANY, NULL, NULL);
144
145 /*
146 * The sysinit table itself. Items are checked off as the are run.
147 * If we want to register new sysinit types, add them to newsysinit.
148 */
149 SET_DECLARE(sysinit_set, struct sysinit);
150 struct sysinit **sysinit, **sysinit_end;
151 struct sysinit **newsysinit, **newsysinit_end;
152
153 EVENTHANDLER_LIST_DECLARE(process_init);
154 EVENTHANDLER_LIST_DECLARE(thread_init);
155 EVENTHANDLER_LIST_DECLARE(process_ctor);
156 EVENTHANDLER_LIST_DECLARE(thread_ctor);
157
158 /*
159 * Merge a new sysinit set into the current set, reallocating it if
160 * necessary. This can only be called after malloc is running.
161 */
162 void
163 sysinit_add(struct sysinit **set, struct sysinit **set_end)
164 {
165 struct sysinit **newset;
166 struct sysinit **sipp;
167 struct sysinit **xipp;
168 int count;
169
170 count = set_end - set;
171 if (newsysinit)
172 count += newsysinit_end - newsysinit;
173 else
174 count += sysinit_end - sysinit;
175 newset = malloc(count * sizeof(*sipp), M_TEMP, M_NOWAIT);
176 if (newset == NULL)
177 panic("cannot malloc for sysinit");
178 xipp = newset;
179 if (newsysinit)
180 for (sipp = newsysinit; sipp < newsysinit_end; sipp++)
181 *xipp++ = *sipp;
182 else
183 for (sipp = sysinit; sipp < sysinit_end; sipp++)
184 *xipp++ = *sipp;
185 for (sipp = set; sipp < set_end; sipp++)
186 *xipp++ = *sipp;
187 if (newsysinit)
188 free(newsysinit, M_TEMP);
189 newsysinit = newset;
190 newsysinit_end = newset + count;
191 }
192
193 #if defined (DDB) && defined(VERBOSE_SYSINIT)
194 static const char *
195 symbol_name(vm_offset_t va, db_strategy_t strategy)
196 {
197 const char *name;
198 c_db_sym_t sym;
199 db_expr_t offset;
200
201 if (va == 0)
202 return (NULL);
203 sym = db_search_symbol(va, strategy, &offset);
204 if (offset != 0)
205 return (NULL);
206 db_symbol_values(sym, &name, NULL);
207 return (name);
208 }
209 #endif
210
211 /*
212 * System startup; initialize the world, create process 0, mount root
213 * filesystem, and fork to create init and pagedaemon. Most of the
214 * hard work is done in the lower-level initialization routines including
215 * startup(), which does memory initialization and autoconfiguration.
216 *
217 * This allows simple addition of new kernel subsystems that require
218 * boot time initialization. It also allows substitution of subsystem
219 * (for instance, a scheduler, kernel profiler, or VM system) by object
220 * module. Finally, it allows for optional "kernel threads".
221 */
222 void
223 mi_startup(void)
224 {
225
226 struct sysinit **sipp; /* system initialization*/
227 struct sysinit **xipp; /* interior loop of sort*/
228 struct sysinit *save; /* bubble*/
229
230 #if defined(VERBOSE_SYSINIT)
231 int last;
232 int verbose;
233 #endif
234
235 TSENTER();
236
237 if (boothowto & RB_VERBOSE)
238 bootverbose++;
239
240 if (sysinit == NULL) {
241 sysinit = SET_BEGIN(sysinit_set);
242 sysinit_end = SET_LIMIT(sysinit_set);
243 }
244
245 restart:
246 /*
247 * Perform a bubble sort of the system initialization objects by
248 * their subsystem (primary key) and order (secondary key).
249 */
250 for (sipp = sysinit; sipp < sysinit_end; sipp++) {
251 for (xipp = sipp + 1; xipp < sysinit_end; xipp++) {
252 if ((*sipp)->subsystem < (*xipp)->subsystem ||
253 ((*sipp)->subsystem == (*xipp)->subsystem &&
254 (*sipp)->order <= (*xipp)->order))
255 continue; /* skip*/
256 save = *sipp;
257 *sipp = *xipp;
258 *xipp = save;
259 }
260 }
261
262 #if defined(VERBOSE_SYSINIT)
263 last = SI_SUB_COPYRIGHT;
264 verbose = 0;
265 #if !defined(DDB)
266 printf("VERBOSE_SYSINIT: DDB not enabled, symbol lookups disabled.\n");
267 #endif
268 #endif
269
270 /*
271 * Traverse the (now) ordered list of system initialization tasks.
272 * Perform each task, and continue on to the next task.
273 */
274 for (sipp = sysinit; sipp < sysinit_end; sipp++) {
275
276 if ((*sipp)->subsystem == SI_SUB_DUMMY)
277 continue; /* skip dummy task(s)*/
278
279 if ((*sipp)->subsystem == SI_SUB_DONE)
280 continue;
281
282 #if defined(VERBOSE_SYSINIT)
283 if ((*sipp)->subsystem > last && verbose_sysinit != 0) {
284 verbose = 1;
285 last = (*sipp)->subsystem;
286 printf("subsystem %x\n", last);
287 }
288 if (verbose) {
289 #if defined(DDB)
290 const char *func, *data;
291
292 func = symbol_name((vm_offset_t)(*sipp)->func,
293 DB_STGY_PROC);
294 data = symbol_name((vm_offset_t)(*sipp)->udata,
295 DB_STGY_ANY);
296 if (func != NULL && data != NULL)
297 printf(" %s(&%s)... ", func, data);
298 else if (func != NULL)
299 printf(" %s(%p)... ", func, (*sipp)->udata);
300 else
301 #endif
302 printf(" %p(%p)... ", (*sipp)->func,
303 (*sipp)->udata);
304 }
305 #endif
306
307 /* Call function */
308 (*((*sipp)->func))((*sipp)->udata);
309
310 #if defined(VERBOSE_SYSINIT)
311 if (verbose)
312 printf("done.\n");
313 #endif
314
315 /* Check off the one we're just done */
316 (*sipp)->subsystem = SI_SUB_DONE;
317
318 /* Check if we've installed more sysinit items via KLD */
319 if (newsysinit != NULL) {
320 if (sysinit != SET_BEGIN(sysinit_set))
321 free(sysinit, M_TEMP);
322 sysinit = newsysinit;
323 sysinit_end = newsysinit_end;
324 newsysinit = NULL;
325 newsysinit_end = NULL;
326 goto restart;
327 }
328 }
329
330 TSEXIT(); /* Here so we don't overlap with start_init. */
331
332 mtx_assert(&Giant, MA_OWNED | MA_NOTRECURSED);
333 mtx_unlock(&Giant);
334
335 /*
336 * Now hand over this thread to swapper.
337 */
338 swapper();
339 /* NOTREACHED*/
340 }
341
342 static void
343 print_caddr_t(void *data)
344 {
345 printf("%s", (char *)data);
346 }
347
348 static void
349 print_version(void *data __unused)
350 {
351 int len;
352
353 /* Strip a trailing newline from version. */
354 len = strlen(version);
355 while (len > 0 && version[len - 1] == '\n')
356 len--;
357 printf("%.*s %s\n", len, version, machine);
358 printf("%s\n", compiler_version);
359 }
360
361 SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t,
362 copyright);
363 SYSINIT(trademark, SI_SUB_COPYRIGHT, SI_ORDER_SECOND, print_caddr_t,
364 trademark);
365 SYSINIT(version, SI_SUB_COPYRIGHT, SI_ORDER_THIRD, print_version, NULL);
366
367 #ifdef WITNESS
368 static char wit_warn[] =
369 "WARNING: WITNESS option enabled, expect reduced performance.\n";
370 SYSINIT(witwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 1,
371 print_caddr_t, wit_warn);
372 SYSINIT(witwarn2, SI_SUB_LAST, SI_ORDER_THIRD + 1,
373 print_caddr_t, wit_warn);
374 #endif
375
376 #ifdef DIAGNOSTIC
377 static char diag_warn[] =
378 "WARNING: DIAGNOSTIC option enabled, expect reduced performance.\n";
379 SYSINIT(diagwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 2,
380 print_caddr_t, diag_warn);
381 SYSINIT(diagwarn2, SI_SUB_LAST, SI_ORDER_THIRD + 2,
382 print_caddr_t, diag_warn);
383 #endif
384
385 static int
386 null_fetch_syscall_args(struct thread *td __unused)
387 {
388
389 panic("null_fetch_syscall_args");
390 }
391
392 static void
393 null_set_syscall_retval(struct thread *td __unused, int error __unused)
394 {
395
396 panic("null_set_syscall_retval");
397 }
398
399 struct sysentvec null_sysvec = {
400 .sv_size = 0,
401 .sv_table = NULL,
402 .sv_mask = 0,
403 .sv_errsize = 0,
404 .sv_errtbl = NULL,
405 .sv_transtrap = NULL,
406 .sv_fixup = NULL,
407 .sv_sendsig = NULL,
408 .sv_sigcode = NULL,
409 .sv_szsigcode = NULL,
410 .sv_name = "null",
411 .sv_coredump = NULL,
412 .sv_imgact_try = NULL,
413 .sv_minsigstksz = 0,
414 .sv_pagesize = PAGE_SIZE,
415 .sv_minuser = VM_MIN_ADDRESS,
416 .sv_maxuser = VM_MAXUSER_ADDRESS,
417 .sv_usrstack = USRSTACK,
418 .sv_psstrings = PS_STRINGS,
419 .sv_stackprot = VM_PROT_ALL,
420 .sv_copyout_strings = NULL,
421 .sv_setregs = NULL,
422 .sv_fixlimit = NULL,
423 .sv_maxssiz = NULL,
424 .sv_flags = 0,
425 .sv_set_syscall_retval = null_set_syscall_retval,
426 .sv_fetch_syscall_args = null_fetch_syscall_args,
427 .sv_syscallnames = NULL,
428 .sv_schedtail = NULL,
429 .sv_thread_detach = NULL,
430 .sv_trap = NULL,
431 };
432
433 /*
434 * The two following SYSINIT's are proc0 specific glue code. I am not
435 * convinced that they can not be safely combined, but their order of
436 * operation has been maintained as the same as the original init_main.c
437 * for right now.
438 */
439 /* ARGSUSED*/
440 static void
441 proc0_init(void *dummy __unused)
442 {
443 struct proc *p;
444 struct thread *td;
445 struct ucred *newcred;
446 struct uidinfo tmpuinfo;
447 struct loginclass tmplc = {
448 .lc_name = "",
449 };
450 vm_paddr_t pageablemem;
451 int i;
452
453 GIANT_REQUIRED;
454 p = &proc0;
455 td = &thread0;
456
457 /*
458 * Initialize magic number and osrel.
459 */
460 p->p_magic = P_MAGIC;
461 p->p_osrel = osreldate;
462
463 /*
464 * Initialize thread and process structures.
465 */
466 procinit(); /* set up proc zone */
467 threadinit(); /* set up UMA zones */
468
469 /*
470 * Initialise scheduler resources.
471 * Add scheduler specific parts to proc, thread as needed.
472 */
473 schedinit(); /* scheduler gets its house in order */
474
475 /*
476 * Create process 0 (the swapper).
477 */
478 LIST_INSERT_HEAD(&allproc, p, p_list);
479 LIST_INSERT_HEAD(PIDHASH(0), p, p_hash);
480 mtx_init(&pgrp0.pg_mtx, "process group", NULL, MTX_DEF | MTX_DUPOK);
481 p->p_pgrp = &pgrp0;
482 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash);
483 LIST_INIT(&pgrp0.pg_members);
484 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist);
485
486 pgrp0.pg_session = &session0;
487 mtx_init(&session0.s_mtx, "session", NULL, MTX_DEF);
488 refcount_init(&session0.s_count, 1);
489 session0.s_leader = p;
490
491 p->p_sysent = &null_sysvec;
492 p->p_flag = P_SYSTEM | P_INMEM | P_KPROC;
493 p->p_flag2 = 0;
494 p->p_state = PRS_NORMAL;
495 p->p_klist = knlist_alloc(&p->p_mtx);
496 STAILQ_INIT(&p->p_ktr);
497 p->p_nice = NZERO;
498 /* pid_max cannot be greater than PID_MAX */
499 td->td_tid = PID_MAX + 1;
500 LIST_INSERT_HEAD(TIDHASH(td->td_tid), td, td_hash);
501 td->td_state = TDS_RUNNING;
502 td->td_pri_class = PRI_TIMESHARE;
503 td->td_user_pri = PUSER;
504 td->td_base_user_pri = PUSER;
505 td->td_lend_user_pri = PRI_MAX;
506 td->td_priority = PVM;
507 td->td_base_pri = PVM;
508 td->td_oncpu = curcpu;
509 td->td_flags = TDF_INMEM;
510 td->td_pflags = TDP_KTHREAD;
511 td->td_cpuset = cpuset_thread0();
512 td->td_domain.dr_policy = td->td_cpuset->cs_domain;
513 prison0_init();
514 p->p_peers = 0;
515 p->p_leader = p;
516 p->p_reaper = p;
517 p->p_treeflag |= P_TREE_REAPER;
518 LIST_INIT(&p->p_reaplist);
519
520 strncpy(p->p_comm, "kernel", sizeof (p->p_comm));
521 strncpy(td->td_name, "swapper", sizeof (td->td_name));
522
523 callout_init_mtx(&p->p_itcallout, &p->p_mtx, 0);
524 callout_init_mtx(&p->p_limco, &p->p_mtx, 0);
525 callout_init(&td->td_slpcallout, 1);
526
527 /* Create credentials. */
528 newcred = crget();
529 newcred->cr_ngroups = 1; /* group 0 */
530 /* A hack to prevent uifind from tripping over NULL pointers. */
531 curthread->td_ucred = newcred;
532 tmpuinfo.ui_uid = 1;
533 newcred->cr_uidinfo = newcred->cr_ruidinfo = &tmpuinfo;
534 newcred->cr_uidinfo = uifind(0);
535 newcred->cr_ruidinfo = uifind(0);
536 newcred->cr_loginclass = &tmplc;
537 newcred->cr_loginclass = loginclass_find("default");
538 /* End hack. creds get properly set later with thread_cow_get_proc */
539 curthread->td_ucred = NULL;
540 newcred->cr_prison = &prison0;
541 proc_set_cred_init(p, newcred);
542 #ifdef AUDIT
543 audit_cred_kproc0(newcred);
544 #endif
545 #ifdef MAC
546 mac_cred_create_swapper(newcred);
547 #endif
548 /* Create sigacts. */
549 p->p_sigacts = sigacts_alloc();
550
551 /* Initialize signal state for process 0. */
552 siginit(&proc0);
553
554 /* Create the file descriptor table. */
555 p->p_fd = fdinit(NULL, false);
556 p->p_fdtol = NULL;
557
558 /* Create the limits structures. */
559 p->p_limit = lim_alloc();
560 for (i = 0; i < RLIM_NLIMITS; i++)
561 p->p_limit->pl_rlimit[i].rlim_cur =
562 p->p_limit->pl_rlimit[i].rlim_max = RLIM_INFINITY;
563 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_cur =
564 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles;
565 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_cur =
566 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc;
567 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_cur = dfldsiz;
568 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_max = maxdsiz;
569 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_cur = dflssiz;
570 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_max = maxssiz;
571 /* Cast to avoid overflow on i386/PAE. */
572 pageablemem = ptoa((vm_paddr_t)vm_free_count());
573 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_cur =
574 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_max = pageablemem;
575 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = pageablemem / 3;
576 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_max = pageablemem;
577 p->p_cpulimit = RLIM_INFINITY;
578
579 PROC_LOCK(p);
580 thread_cow_get_proc(td, p);
581 PROC_UNLOCK(p);
582
583 /* Initialize resource accounting structures. */
584 racct_create(&p->p_racct);
585
586 p->p_stats = pstats_alloc();
587
588 /* Allocate a prototype map so we have something to fork. */
589 p->p_vmspace = &vmspace0;
590 vmspace0.vm_refcnt = 1;
591 pmap_pinit0(vmspace_pmap(&vmspace0));
592
593 /*
594 * proc0 is not expected to enter usermode, so there is no special
595 * handling for sv_minuser here, like is done for exec_new_vmspace().
596 */
597 vm_map_init(&vmspace0.vm_map, vmspace_pmap(&vmspace0),
598 p->p_sysent->sv_minuser, p->p_sysent->sv_maxuser);
599
600 /*
601 * Call the init and ctor for the new thread and proc. We wait
602 * to do this until all other structures are fairly sane.
603 */
604 EVENTHANDLER_DIRECT_INVOKE(process_init, p);
605 EVENTHANDLER_DIRECT_INVOKE(thread_init, td);
606 EVENTHANDLER_DIRECT_INVOKE(process_ctor, p);
607 EVENTHANDLER_DIRECT_INVOKE(thread_ctor, td);
608
609 /*
610 * Charge root for one process.
611 */
612 (void)chgproccnt(p->p_ucred->cr_ruidinfo, 1, 0);
613 PROC_LOCK(p);
614 racct_add_force(p, RACCT_NPROC, 1);
615 PROC_UNLOCK(p);
616 }
617 SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL);
618
619 /* ARGSUSED*/
620 static void
621 proc0_post(void *dummy __unused)
622 {
623 struct timespec ts;
624 struct proc *p;
625 struct rusage ru;
626 struct thread *td;
627
628 /*
629 * Now we can look at the time, having had a chance to verify the
630 * time from the filesystem. Pretend that proc0 started now.
631 */
632 sx_slock(&allproc_lock);
633 FOREACH_PROC_IN_SYSTEM(p) {
634 PROC_LOCK(p);
635 if (p->p_state == PRS_NEW) {
636 PROC_UNLOCK(p);
637 continue;
638 }
639 microuptime(&p->p_stats->p_start);
640 PROC_STATLOCK(p);
641 rufetch(p, &ru); /* Clears thread stats */
642 p->p_rux.rux_runtime = 0;
643 p->p_rux.rux_uticks = 0;
644 p->p_rux.rux_sticks = 0;
645 p->p_rux.rux_iticks = 0;
646 PROC_STATUNLOCK(p);
647 FOREACH_THREAD_IN_PROC(p, td) {
648 td->td_runtime = 0;
649 }
650 PROC_UNLOCK(p);
651 }
652 sx_sunlock(&allproc_lock);
653 PCPU_SET(switchtime, cpu_ticks());
654 PCPU_SET(switchticks, ticks);
655
656 /*
657 * Give the ``random'' number generator a thump.
658 */
659 nanotime(&ts);
660 srandom(ts.tv_sec ^ ts.tv_nsec);
661 }
662 SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL);
663
664 static void
665 random_init(void *dummy __unused)
666 {
667
668 /*
669 * After CPU has been started we have some randomness on most
670 * platforms via get_cyclecount(). For platforms that don't
671 * we will reseed random(9) in proc0_post() as well.
672 */
673 srandom(get_cyclecount());
674 }
675 SYSINIT(random, SI_SUB_RANDOM, SI_ORDER_FIRST, random_init, NULL);
676
677 /*
678 ***************************************************************************
679 ****
680 **** The following SYSINIT's and glue code should be moved to the
681 **** respective files on a per subsystem basis.
682 ****
683 ***************************************************************************
684 */
685
686 /*
687 * List of paths to try when searching for "init".
688 */
689 static char init_path[MAXPATHLEN] =
690 #ifdef INIT_PATH
691 __XSTRING(INIT_PATH);
692 #else
693 "/sbin/init:/sbin/oinit:/sbin/init.bak:/rescue/init";
694 #endif
695 SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0,
696 "Path used to search the init process");
697
698 /*
699 * Shutdown timeout of init(8).
700 * Unused within kernel, but used to control init(8), hence do not remove.
701 */
702 #ifndef INIT_SHUTDOWN_TIMEOUT
703 #define INIT_SHUTDOWN_TIMEOUT 120
704 #endif
705 static int init_shutdown_timeout = INIT_SHUTDOWN_TIMEOUT;
706 SYSCTL_INT(_kern, OID_AUTO, init_shutdown_timeout,
707 CTLFLAG_RW, &init_shutdown_timeout, 0, "Shutdown timeout of init(8). "
708 "Unused within kernel, but used to control init(8)");
709
710 /*
711 * Start the initial user process; try exec'ing each pathname in init_path.
712 * The program is invoked with one argument containing the boot flags.
713 */
714 static void
715 start_init(void *dummy)
716 {
717 vm_offset_t addr;
718 struct execve_args args;
719 int options, error;
720 size_t pathlen;
721 char *var, *path;
722 char *free_init_path, *tmp_init_path;
723 char *ucp, **uap, *arg0, *arg1;
724 struct thread *td;
725 struct proc *p;
726
727 TSENTER(); /* Here so we don't overlap with mi_startup. */
728
729 td = curthread;
730 p = td->td_proc;
731
732 vfs_mountroot();
733
734 /* Wipe GELI passphrase from the environment. */
735 kern_unsetenv("kern.geom.eli.passphrase");
736
737 /*
738 * Need just enough stack to hold the faked-up "execve()" arguments.
739 */
740 addr = p->p_sysent->sv_usrstack - PAGE_SIZE;
741 if (vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &addr, PAGE_SIZE, 0,
742 VMFS_NO_SPACE, VM_PROT_ALL, VM_PROT_ALL, 0) != 0)
743 panic("init: couldn't allocate argument space");
744 p->p_vmspace->vm_maxsaddr = (caddr_t)addr;
745 p->p_vmspace->vm_ssize = 1;
746
747 if ((var = kern_getenv("init_path")) != NULL) {
748 strlcpy(init_path, var, sizeof(init_path));
749 freeenv(var);
750 }
751 free_init_path = tmp_init_path = strdup(init_path, M_TEMP);
752
753 while ((path = strsep(&tmp_init_path, ":")) != NULL) {
754 pathlen = strlen(path) + 1;
755 if (bootverbose)
756 printf("start_init: trying %s\n", path);
757
758 /*
759 * Move out the boot flag argument.
760 */
761 options = 0;
762 ucp = (char *)p->p_sysent->sv_usrstack;
763 (void)subyte(--ucp, 0); /* trailing zero */
764 if (boothowto & RB_SINGLE) {
765 (void)subyte(--ucp, 's');
766 options = 1;
767 }
768 #ifdef notyet
769 if (boothowto & RB_FASTBOOT) {
770 (void)subyte(--ucp, 'f');
771 options = 1;
772 }
773 #endif
774
775 #ifdef BOOTCDROM
776 (void)subyte(--ucp, 'C');
777 options = 1;
778 #endif
779
780 if (options == 0)
781 (void)subyte(--ucp, '-');
782 (void)subyte(--ucp, '-'); /* leading hyphen */
783 arg1 = ucp;
784
785 /*
786 * Move out the file name (also arg 0).
787 */
788 ucp -= pathlen;
789 copyout(path, ucp, pathlen);
790 arg0 = ucp;
791
792 /*
793 * Move out the arg pointers.
794 */
795 uap = (char **)rounddown2((intptr_t)ucp, sizeof(intptr_t));
796 (void)suword((caddr_t)--uap, (long)0); /* terminator */
797 (void)suword((caddr_t)--uap, (long)(intptr_t)arg1);
798 (void)suword((caddr_t)--uap, (long)(intptr_t)arg0);
799
800 /*
801 * Point at the arguments.
802 */
803 args.fname = arg0;
804 args.argv = uap;
805 args.envv = NULL;
806
807 /*
808 * Now try to exec the program. If can't for any reason
809 * other than it doesn't exist, complain.
810 *
811 * Otherwise, return via fork_trampoline() all the way
812 * to user mode as init!
813 */
814 if ((error = sys_execve(td, &args)) == EJUSTRETURN) {
815 free(free_init_path, M_TEMP);
816 TSEXIT();
817 return;
818 }
819 if (error != ENOENT)
820 printf("exec %s: error %d\n", path, error);
821 }
822 free(free_init_path, M_TEMP);
823 printf("init: not found in path %s\n", init_path);
824 panic("no init");
825 }
826
827 /*
828 * Like kproc_create(), but runs in its own address space.
829 * We do this early to reserve pid 1.
830 *
831 * Note special case - do not make it runnable yet. Other work
832 * in progress will change this more.
833 */
834 static void
835 create_init(const void *udata __unused)
836 {
837 struct fork_req fr;
838 struct ucred *newcred, *oldcred;
839 struct thread *td;
840 int error;
841
842 bzero(&fr, sizeof(fr));
843 fr.fr_flags = RFFDG | RFPROC | RFSTOPPED;
844 fr.fr_procp = &initproc;
845 error = fork1(&thread0, &fr);
846 if (error)
847 panic("cannot fork init: %d\n", error);
848 KASSERT(initproc->p_pid == 1, ("create_init: initproc->p_pid != 1"));
849 /* divorce init's credentials from the kernel's */
850 newcred = crget();
851 sx_xlock(&proctree_lock);
852 PROC_LOCK(initproc);
853 initproc->p_flag |= P_SYSTEM | P_INMEM;
854 initproc->p_treeflag |= P_TREE_REAPER;
855 oldcred = initproc->p_ucred;
856 crcopy(newcred, oldcred);
857 #ifdef MAC
858 mac_cred_create_init(newcred);
859 #endif
860 #ifdef AUDIT
861 audit_cred_proc1(newcred);
862 #endif
863 proc_set_cred(initproc, newcred);
864 td = FIRST_THREAD_IN_PROC(initproc);
865 crfree(td->td_ucred);
866 td->td_ucred = crhold(initproc->p_ucred);
867 PROC_UNLOCK(initproc);
868 sx_xunlock(&proctree_lock);
869 crfree(oldcred);
870 cpu_fork_kthread_handler(FIRST_THREAD_IN_PROC(initproc),
871 start_init, NULL);
872 }
873 SYSINIT(init, SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL);
874
875 /*
876 * Make it runnable now.
877 */
878 static void
879 kick_init(const void *udata __unused)
880 {
881 struct thread *td;
882
883 td = FIRST_THREAD_IN_PROC(initproc);
884 thread_lock(td);
885 TD_SET_CAN_RUN(td);
886 sched_add(td, SRQ_BORING);
887 thread_unlock(td);
888 }
889 SYSINIT(kickinit, SI_SUB_KTHREAD_INIT, SI_ORDER_MIDDLE, kick_init, NULL);
Cache object: dde53ef4073673143762da211b212213
|