FreeBSD/Linux Kernel Cross Reference
sys/kern/init_main.c
1 /*-
2 * Copyright (c) 1995 Terrence R. Lambert
3 * All rights reserved.
4 *
5 * Copyright (c) 1982, 1986, 1989, 1991, 1992, 1993
6 * The Regents of the University of California. All rights reserved.
7 * (c) UNIX System Laboratories, Inc.
8 * All or some portions of this file are derived from material licensed
9 * to the University of California by American Telephone and Telegraph
10 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
11 * the permission of UNIX System Laboratories, Inc.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. All advertising materials mentioning features or use of this software
22 * must display the following acknowledgement:
23 * This product includes software developed by the University of
24 * California, Berkeley and its contributors.
25 * 4. Neither the name of the University nor the names of its contributors
26 * may be used to endorse or promote products derived from this software
27 * without specific prior written permission.
28 *
29 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
30 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
31 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
32 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
33 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
34 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
35 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
37 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
38 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
39 * SUCH DAMAGE.
40 *
41 * @(#)init_main.c 8.9 (Berkeley) 1/21/94
42 */
43
44 #include <sys/cdefs.h>
45 __FBSDID("$FreeBSD: releng/11.2/sys/kern/init_main.c 331727 2018-03-29 04:41:45Z mjoras $");
46
47 #include "opt_ddb.h"
48 #include "opt_init_path.h"
49 #include "opt_verbose_sysinit.h"
50
51 #include <sys/param.h>
52 #include <sys/kernel.h>
53 #include <sys/exec.h>
54 #include <sys/file.h>
55 #include <sys/filedesc.h>
56 #include <sys/jail.h>
57 #include <sys/ktr.h>
58 #include <sys/lock.h>
59 #include <sys/loginclass.h>
60 #include <sys/mount.h>
61 #include <sys/mutex.h>
62 #include <sys/syscallsubr.h>
63 #include <sys/sysctl.h>
64 #include <sys/proc.h>
65 #include <sys/racct.h>
66 #include <sys/resourcevar.h>
67 #include <sys/systm.h>
68 #include <sys/signalvar.h>
69 #include <sys/vnode.h>
70 #include <sys/sysent.h>
71 #include <sys/reboot.h>
72 #include <sys/sched.h>
73 #include <sys/sx.h>
74 #include <sys/sysproto.h>
75 #include <sys/vmmeter.h>
76 #include <sys/unistd.h>
77 #include <sys/malloc.h>
78 #include <sys/conf.h>
79 #include <sys/cpuset.h>
80
81 #include <machine/cpu.h>
82
83 #include <security/audit/audit.h>
84 #include <security/mac/mac_framework.h>
85
86 #include <vm/vm.h>
87 #include <vm/vm_param.h>
88 #include <vm/pmap.h>
89 #include <vm/vm_map.h>
90 #include <vm/vm_domain.h>
91 #include <sys/copyright.h>
92
93 #include <ddb/ddb.h>
94 #include <ddb/db_sym.h>
95
96 void mi_startup(void); /* Should be elsewhere */
97
98 /* Components of the first process -- never freed. */
99 static struct session session0;
100 static struct pgrp pgrp0;
101 struct proc proc0;
102 struct thread0_storage thread0_st __aligned(32);
103 struct vmspace vmspace0;
104 struct proc *initproc;
105
106 #ifndef BOOTHOWTO
107 #define BOOTHOWTO 0
108 #endif
109 int boothowto = BOOTHOWTO; /* initialized so that it can be patched */
110 SYSCTL_INT(_debug, OID_AUTO, boothowto, CTLFLAG_RD, &boothowto, 0,
111 "Boot control flags, passed from loader");
112
113 #ifndef BOOTVERBOSE
114 #define BOOTVERBOSE 0
115 #endif
116 int bootverbose = BOOTVERBOSE;
117 SYSCTL_INT(_debug, OID_AUTO, bootverbose, CTLFLAG_RW, &bootverbose, 0,
118 "Control the output of verbose kernel messages");
119
120 #ifdef INVARIANTS
121 FEATURE(invariants, "Kernel compiled with INVARIANTS, may affect performance");
122 #endif
123
124 /*
125 * This ensures that there is at least one entry so that the sysinit_set
126 * symbol is not undefined. A sybsystem ID of SI_SUB_DUMMY is never
127 * executed.
128 */
129 SYSINIT(placeholder, SI_SUB_DUMMY, SI_ORDER_ANY, NULL, NULL);
130
131 /*
132 * The sysinit table itself. Items are checked off as the are run.
133 * If we want to register new sysinit types, add them to newsysinit.
134 */
135 SET_DECLARE(sysinit_set, struct sysinit);
136 struct sysinit **sysinit, **sysinit_end;
137 struct sysinit **newsysinit, **newsysinit_end;
138
139 EVENTHANDLER_LIST_DECLARE(process_init);
140 EVENTHANDLER_LIST_DECLARE(thread_init);
141 EVENTHANDLER_LIST_DECLARE(process_ctor);
142 EVENTHANDLER_LIST_DECLARE(thread_ctor);
143
144 /*
145 * Merge a new sysinit set into the current set, reallocating it if
146 * necessary. This can only be called after malloc is running.
147 */
148 void
149 sysinit_add(struct sysinit **set, struct sysinit **set_end)
150 {
151 struct sysinit **newset;
152 struct sysinit **sipp;
153 struct sysinit **xipp;
154 int count;
155
156 count = set_end - set;
157 if (newsysinit)
158 count += newsysinit_end - newsysinit;
159 else
160 count += sysinit_end - sysinit;
161 newset = malloc(count * sizeof(*sipp), M_TEMP, M_NOWAIT);
162 if (newset == NULL)
163 panic("cannot malloc for sysinit");
164 xipp = newset;
165 if (newsysinit)
166 for (sipp = newsysinit; sipp < newsysinit_end; sipp++)
167 *xipp++ = *sipp;
168 else
169 for (sipp = sysinit; sipp < sysinit_end; sipp++)
170 *xipp++ = *sipp;
171 for (sipp = set; sipp < set_end; sipp++)
172 *xipp++ = *sipp;
173 if (newsysinit)
174 free(newsysinit, M_TEMP);
175 newsysinit = newset;
176 newsysinit_end = newset + count;
177 }
178
179 #if defined (DDB) && defined(VERBOSE_SYSINIT)
180 static const char *
181 symbol_name(vm_offset_t va, db_strategy_t strategy)
182 {
183 const char *name;
184 c_db_sym_t sym;
185 db_expr_t offset;
186
187 if (va == 0)
188 return (NULL);
189 sym = db_search_symbol(va, strategy, &offset);
190 if (offset != 0)
191 return (NULL);
192 db_symbol_values(sym, &name, NULL);
193 return (name);
194 }
195 #endif
196
197 /*
198 * System startup; initialize the world, create process 0, mount root
199 * filesystem, and fork to create init and pagedaemon. Most of the
200 * hard work is done in the lower-level initialization routines including
201 * startup(), which does memory initialization and autoconfiguration.
202 *
203 * This allows simple addition of new kernel subsystems that require
204 * boot time initialization. It also allows substitution of subsystem
205 * (for instance, a scheduler, kernel profiler, or VM system) by object
206 * module. Finally, it allows for optional "kernel threads".
207 */
208 void
209 mi_startup(void)
210 {
211
212 register struct sysinit **sipp; /* system initialization*/
213 register struct sysinit **xipp; /* interior loop of sort*/
214 register struct sysinit *save; /* bubble*/
215
216 #if defined(VERBOSE_SYSINIT)
217 int last;
218 int verbose;
219 #endif
220
221 if (boothowto & RB_VERBOSE)
222 bootverbose++;
223
224 if (sysinit == NULL) {
225 sysinit = SET_BEGIN(sysinit_set);
226 sysinit_end = SET_LIMIT(sysinit_set);
227 }
228
229 restart:
230 /*
231 * Perform a bubble sort of the system initialization objects by
232 * their subsystem (primary key) and order (secondary key).
233 */
234 for (sipp = sysinit; sipp < sysinit_end; sipp++) {
235 for (xipp = sipp + 1; xipp < sysinit_end; xipp++) {
236 if ((*sipp)->subsystem < (*xipp)->subsystem ||
237 ((*sipp)->subsystem == (*xipp)->subsystem &&
238 (*sipp)->order <= (*xipp)->order))
239 continue; /* skip*/
240 save = *sipp;
241 *sipp = *xipp;
242 *xipp = save;
243 }
244 }
245
246 #if defined(VERBOSE_SYSINIT)
247 last = SI_SUB_COPYRIGHT;
248 verbose = 0;
249 #if !defined(DDB)
250 printf("VERBOSE_SYSINIT: DDB not enabled, symbol lookups disabled.\n");
251 #endif
252 #endif
253
254 /*
255 * Traverse the (now) ordered list of system initialization tasks.
256 * Perform each task, and continue on to the next task.
257 */
258 for (sipp = sysinit; sipp < sysinit_end; sipp++) {
259
260 if ((*sipp)->subsystem == SI_SUB_DUMMY)
261 continue; /* skip dummy task(s)*/
262
263 if ((*sipp)->subsystem == SI_SUB_DONE)
264 continue;
265
266 #if defined(VERBOSE_SYSINIT)
267 if ((*sipp)->subsystem > last) {
268 verbose = 1;
269 last = (*sipp)->subsystem;
270 printf("subsystem %x\n", last);
271 }
272 if (verbose) {
273 #if defined(DDB)
274 const char *func, *data;
275
276 func = symbol_name((vm_offset_t)(*sipp)->func,
277 DB_STGY_PROC);
278 data = symbol_name((vm_offset_t)(*sipp)->udata,
279 DB_STGY_ANY);
280 if (func != NULL && data != NULL)
281 printf(" %s(&%s)... ", func, data);
282 else if (func != NULL)
283 printf(" %s(%p)... ", func, (*sipp)->udata);
284 else
285 #endif
286 printf(" %p(%p)... ", (*sipp)->func,
287 (*sipp)->udata);
288 }
289 #endif
290
291 /* Call function */
292 (*((*sipp)->func))((*sipp)->udata);
293
294 #if defined(VERBOSE_SYSINIT)
295 if (verbose)
296 printf("done.\n");
297 #endif
298
299 /* Check off the one we're just done */
300 (*sipp)->subsystem = SI_SUB_DONE;
301
302 /* Check if we've installed more sysinit items via KLD */
303 if (newsysinit != NULL) {
304 if (sysinit != SET_BEGIN(sysinit_set))
305 free(sysinit, M_TEMP);
306 sysinit = newsysinit;
307 sysinit_end = newsysinit_end;
308 newsysinit = NULL;
309 newsysinit_end = NULL;
310 goto restart;
311 }
312 }
313
314 mtx_assert(&Giant, MA_OWNED | MA_NOTRECURSED);
315 mtx_unlock(&Giant);
316
317 /*
318 * Now hand over this thread to swapper.
319 */
320 swapper();
321 /* NOTREACHED*/
322 }
323
324
325 /*
326 ***************************************************************************
327 ****
328 **** The following SYSINIT's belong elsewhere, but have not yet
329 **** been moved.
330 ****
331 ***************************************************************************
332 */
333 static void
334 print_caddr_t(void *data)
335 {
336 printf("%s", (char *)data);
337 }
338
339 static void
340 print_version(void *data __unused)
341 {
342 int len;
343
344 /* Strip a trailing newline from version. */
345 len = strlen(version);
346 while (len > 0 && version[len - 1] == '\n')
347 len--;
348 printf("%.*s %s\n", len, version, machine);
349 printf("%s\n", compiler_version);
350 }
351
352 SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t,
353 copyright);
354 SYSINIT(trademark, SI_SUB_COPYRIGHT, SI_ORDER_SECOND, print_caddr_t,
355 trademark);
356 SYSINIT(version, SI_SUB_COPYRIGHT, SI_ORDER_THIRD, print_version, NULL);
357
358 #ifdef WITNESS
359 static char wit_warn[] =
360 "WARNING: WITNESS option enabled, expect reduced performance.\n";
361 SYSINIT(witwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 1,
362 print_caddr_t, wit_warn);
363 SYSINIT(witwarn2, SI_SUB_LAST, SI_ORDER_THIRD + 1,
364 print_caddr_t, wit_warn);
365 #endif
366
367 #ifdef DIAGNOSTIC
368 static char diag_warn[] =
369 "WARNING: DIAGNOSTIC option enabled, expect reduced performance.\n";
370 SYSINIT(diagwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 2,
371 print_caddr_t, diag_warn);
372 SYSINIT(diagwarn2, SI_SUB_LAST, SI_ORDER_THIRD + 2,
373 print_caddr_t, diag_warn);
374 #endif
375
376 static int
377 null_fetch_syscall_args(struct thread *td __unused)
378 {
379
380 panic("null_fetch_syscall_args");
381 }
382
383 static void
384 null_set_syscall_retval(struct thread *td __unused, int error __unused)
385 {
386
387 panic("null_set_syscall_retval");
388 }
389
390 struct sysentvec null_sysvec = {
391 .sv_size = 0,
392 .sv_table = NULL,
393 .sv_mask = 0,
394 .sv_errsize = 0,
395 .sv_errtbl = NULL,
396 .sv_transtrap = NULL,
397 .sv_fixup = NULL,
398 .sv_sendsig = NULL,
399 .sv_sigcode = NULL,
400 .sv_szsigcode = NULL,
401 .sv_name = "null",
402 .sv_coredump = NULL,
403 .sv_imgact_try = NULL,
404 .sv_minsigstksz = 0,
405 .sv_pagesize = PAGE_SIZE,
406 .sv_minuser = VM_MIN_ADDRESS,
407 .sv_maxuser = VM_MAXUSER_ADDRESS,
408 .sv_usrstack = USRSTACK,
409 .sv_psstrings = PS_STRINGS,
410 .sv_stackprot = VM_PROT_ALL,
411 .sv_copyout_strings = NULL,
412 .sv_setregs = NULL,
413 .sv_fixlimit = NULL,
414 .sv_maxssiz = NULL,
415 .sv_flags = 0,
416 .sv_set_syscall_retval = null_set_syscall_retval,
417 .sv_fetch_syscall_args = null_fetch_syscall_args,
418 .sv_syscallnames = NULL,
419 .sv_schedtail = NULL,
420 .sv_thread_detach = NULL,
421 .sv_trap = NULL,
422 };
423
424 /*
425 ***************************************************************************
426 ****
427 **** The two following SYSINIT's are proc0 specific glue code. I am not
428 **** convinced that they can not be safely combined, but their order of
429 **** operation has been maintained as the same as the original init_main.c
430 **** for right now.
431 ****
432 **** These probably belong in init_proc.c or kern_proc.c, since they
433 **** deal with proc0 (the fork template process).
434 ****
435 ***************************************************************************
436 */
437 /* ARGSUSED*/
438 static void
439 proc0_init(void *dummy __unused)
440 {
441 struct proc *p;
442 struct thread *td;
443 struct ucred *newcred;
444 vm_paddr_t pageablemem;
445 int i;
446
447 GIANT_REQUIRED;
448 p = &proc0;
449 td = &thread0;
450
451 /*
452 * Initialize magic number and osrel.
453 */
454 p->p_magic = P_MAGIC;
455 p->p_osrel = osreldate;
456
457 /*
458 * Initialize thread and process structures.
459 */
460 procinit(); /* set up proc zone */
461 threadinit(); /* set up UMA zones */
462
463 /*
464 * Initialise scheduler resources.
465 * Add scheduler specific parts to proc, thread as needed.
466 */
467 schedinit(); /* scheduler gets its house in order */
468
469 /*
470 * Create process 0 (the swapper).
471 */
472 LIST_INSERT_HEAD(&allproc, p, p_list);
473 LIST_INSERT_HEAD(PIDHASH(0), p, p_hash);
474 mtx_init(&pgrp0.pg_mtx, "process group", NULL, MTX_DEF | MTX_DUPOK);
475 p->p_pgrp = &pgrp0;
476 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash);
477 LIST_INIT(&pgrp0.pg_members);
478 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist);
479
480 pgrp0.pg_session = &session0;
481 mtx_init(&session0.s_mtx, "session", NULL, MTX_DEF);
482 refcount_init(&session0.s_count, 1);
483 session0.s_leader = p;
484
485 p->p_sysent = &null_sysvec;
486 p->p_flag = P_SYSTEM | P_INMEM | P_KPROC;
487 p->p_flag2 = 0;
488 p->p_state = PRS_NORMAL;
489 p->p_klist = knlist_alloc(&p->p_mtx);
490 STAILQ_INIT(&p->p_ktr);
491 p->p_nice = NZERO;
492 /* pid_max cannot be greater than PID_MAX */
493 td->td_tid = PID_MAX + 1;
494 LIST_INSERT_HEAD(TIDHASH(td->td_tid), td, td_hash);
495 td->td_state = TDS_RUNNING;
496 td->td_pri_class = PRI_TIMESHARE;
497 td->td_user_pri = PUSER;
498 td->td_base_user_pri = PUSER;
499 td->td_lend_user_pri = PRI_MAX;
500 td->td_priority = PVM;
501 td->td_base_pri = PVM;
502 td->td_oncpu = 0;
503 td->td_flags = TDF_INMEM;
504 td->td_pflags = TDP_KTHREAD;
505 td->td_cpuset = cpuset_thread0();
506 vm_domain_policy_init(&td->td_vm_dom_policy);
507 vm_domain_policy_set(&td->td_vm_dom_policy, VM_POLICY_NONE, -1);
508 vm_domain_policy_init(&p->p_vm_dom_policy);
509 vm_domain_policy_set(&p->p_vm_dom_policy, VM_POLICY_NONE, -1);
510 prison0_init();
511 p->p_peers = 0;
512 p->p_leader = p;
513 p->p_reaper = p;
514 LIST_INIT(&p->p_reaplist);
515
516 strncpy(p->p_comm, "kernel", sizeof (p->p_comm));
517 strncpy(td->td_name, "swapper", sizeof (td->td_name));
518
519 callout_init_mtx(&p->p_itcallout, &p->p_mtx, 0);
520 callout_init_mtx(&p->p_limco, &p->p_mtx, 0);
521 callout_init(&td->td_slpcallout, 1);
522
523 /* Create credentials. */
524 newcred = crget();
525 newcred->cr_ngroups = 1; /* group 0 */
526 newcred->cr_uidinfo = uifind(0);
527 newcred->cr_ruidinfo = uifind(0);
528 newcred->cr_prison = &prison0;
529 newcred->cr_loginclass = loginclass_find("default");
530 proc_set_cred_init(p, newcred);
531 #ifdef AUDIT
532 audit_cred_kproc0(newcred);
533 #endif
534 #ifdef MAC
535 mac_cred_create_swapper(newcred);
536 #endif
537 /* Create sigacts. */
538 p->p_sigacts = sigacts_alloc();
539
540 /* Initialize signal state for process 0. */
541 siginit(&proc0);
542
543 /* Create the file descriptor table. */
544 p->p_fd = fdinit(NULL, false);
545 p->p_fdtol = NULL;
546
547 /* Create the limits structures. */
548 p->p_limit = lim_alloc();
549 for (i = 0; i < RLIM_NLIMITS; i++)
550 p->p_limit->pl_rlimit[i].rlim_cur =
551 p->p_limit->pl_rlimit[i].rlim_max = RLIM_INFINITY;
552 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_cur =
553 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles;
554 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_cur =
555 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc;
556 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_cur = dfldsiz;
557 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_max = maxdsiz;
558 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_cur = dflssiz;
559 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_max = maxssiz;
560 /* Cast to avoid overflow on i386/PAE. */
561 pageablemem = ptoa((vm_paddr_t)vm_cnt.v_free_count);
562 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_cur =
563 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_max = pageablemem;
564 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = pageablemem / 3;
565 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_max = pageablemem;
566 p->p_cpulimit = RLIM_INFINITY;
567
568 PROC_LOCK(p);
569 thread_cow_get_proc(td, p);
570 PROC_UNLOCK(p);
571
572 /* Initialize resource accounting structures. */
573 racct_create(&p->p_racct);
574
575 p->p_stats = pstats_alloc();
576
577 /* Allocate a prototype map so we have something to fork. */
578 p->p_vmspace = &vmspace0;
579 vmspace0.vm_refcnt = 1;
580 pmap_pinit0(vmspace_pmap(&vmspace0));
581
582 /*
583 * proc0 is not expected to enter usermode, so there is no special
584 * handling for sv_minuser here, like is done for exec_new_vmspace().
585 */
586 vm_map_init(&vmspace0.vm_map, vmspace_pmap(&vmspace0),
587 p->p_sysent->sv_minuser, p->p_sysent->sv_maxuser);
588
589 /*
590 * Call the init and ctor for the new thread and proc. We wait
591 * to do this until all other structures are fairly sane.
592 */
593 EVENTHANDLER_DIRECT_INVOKE(process_init, p);
594 EVENTHANDLER_DIRECT_INVOKE(thread_init, td);
595 EVENTHANDLER_DIRECT_INVOKE(process_ctor, p);
596 EVENTHANDLER_DIRECT_INVOKE(thread_ctor, td);
597
598 /*
599 * Charge root for one process.
600 */
601 (void)chgproccnt(p->p_ucred->cr_ruidinfo, 1, 0);
602 PROC_LOCK(p);
603 racct_add_force(p, RACCT_NPROC, 1);
604 PROC_UNLOCK(p);
605 }
606 SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL);
607
608 /* ARGSUSED*/
609 static void
610 proc0_post(void *dummy __unused)
611 {
612 struct timespec ts;
613 struct proc *p;
614 struct rusage ru;
615 struct thread *td;
616
617 /*
618 * Now we can look at the time, having had a chance to verify the
619 * time from the filesystem. Pretend that proc0 started now.
620 */
621 sx_slock(&allproc_lock);
622 FOREACH_PROC_IN_SYSTEM(p) {
623 microuptime(&p->p_stats->p_start);
624 PROC_STATLOCK(p);
625 rufetch(p, &ru); /* Clears thread stats */
626 PROC_STATUNLOCK(p);
627 p->p_rux.rux_runtime = 0;
628 p->p_rux.rux_uticks = 0;
629 p->p_rux.rux_sticks = 0;
630 p->p_rux.rux_iticks = 0;
631 FOREACH_THREAD_IN_PROC(p, td) {
632 td->td_runtime = 0;
633 }
634 }
635 sx_sunlock(&allproc_lock);
636 PCPU_SET(switchtime, cpu_ticks());
637 PCPU_SET(switchticks, ticks);
638
639 /*
640 * Give the ``random'' number generator a thump.
641 */
642 nanotime(&ts);
643 srandom(ts.tv_sec ^ ts.tv_nsec);
644 }
645 SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL);
646
647 static void
648 random_init(void *dummy __unused)
649 {
650
651 /*
652 * After CPU has been started we have some randomness on most
653 * platforms via get_cyclecount(). For platforms that don't
654 * we will reseed random(9) in proc0_post() as well.
655 */
656 srandom(get_cyclecount());
657 }
658 SYSINIT(random, SI_SUB_RANDOM, SI_ORDER_FIRST, random_init, NULL);
659
660 /*
661 ***************************************************************************
662 ****
663 **** The following SYSINIT's and glue code should be moved to the
664 **** respective files on a per subsystem basis.
665 ****
666 ***************************************************************************
667 */
668
669
670 /*
671 ***************************************************************************
672 ****
673 **** The following code probably belongs in another file, like
674 **** kern/init_init.c.
675 ****
676 ***************************************************************************
677 */
678
679 /*
680 * List of paths to try when searching for "init".
681 */
682 static char init_path[MAXPATHLEN] =
683 #ifdef INIT_PATH
684 __XSTRING(INIT_PATH);
685 #else
686 "/sbin/init:/sbin/oinit:/sbin/init.bak:/rescue/init";
687 #endif
688 SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0,
689 "Path used to search the init process");
690
691 /*
692 * Shutdown timeout of init(8).
693 * Unused within kernel, but used to control init(8), hence do not remove.
694 */
695 #ifndef INIT_SHUTDOWN_TIMEOUT
696 #define INIT_SHUTDOWN_TIMEOUT 120
697 #endif
698 static int init_shutdown_timeout = INIT_SHUTDOWN_TIMEOUT;
699 SYSCTL_INT(_kern, OID_AUTO, init_shutdown_timeout,
700 CTLFLAG_RW, &init_shutdown_timeout, 0, "Shutdown timeout of init(8). "
701 "Unused within kernel, but used to control init(8)");
702
703 /*
704 * Start the initial user process; try exec'ing each pathname in init_path.
705 * The program is invoked with one argument containing the boot flags.
706 */
707 static void
708 start_init(void *dummy)
709 {
710 vm_offset_t addr;
711 struct execve_args args;
712 int options, error;
713 char *var, *path, *next, *s;
714 char *ucp, **uap, *arg0, *arg1;
715 struct thread *td;
716 struct proc *p;
717
718 mtx_lock(&Giant);
719
720 GIANT_REQUIRED;
721
722 td = curthread;
723 p = td->td_proc;
724
725 vfs_mountroot();
726
727 /* Wipe GELI passphrase from the environment. */
728 kern_unsetenv("kern.geom.eli.passphrase");
729
730 /*
731 * Need just enough stack to hold the faked-up "execve()" arguments.
732 */
733 addr = p->p_sysent->sv_usrstack - PAGE_SIZE;
734 if (vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &addr, PAGE_SIZE, 0,
735 VMFS_NO_SPACE, VM_PROT_ALL, VM_PROT_ALL, 0) != 0)
736 panic("init: couldn't allocate argument space");
737 p->p_vmspace->vm_maxsaddr = (caddr_t)addr;
738 p->p_vmspace->vm_ssize = 1;
739
740 if ((var = kern_getenv("init_path")) != NULL) {
741 strlcpy(init_path, var, sizeof(init_path));
742 freeenv(var);
743 }
744
745 for (path = init_path; *path != '\0'; path = next) {
746 while (*path == ':')
747 path++;
748 if (*path == '\0')
749 break;
750 for (next = path; *next != '\0' && *next != ':'; next++)
751 /* nothing */ ;
752 if (bootverbose)
753 printf("start_init: trying %.*s\n", (int)(next - path),
754 path);
755
756 /*
757 * Move out the boot flag argument.
758 */
759 options = 0;
760 ucp = (char *)p->p_sysent->sv_usrstack;
761 (void)subyte(--ucp, 0); /* trailing zero */
762 if (boothowto & RB_SINGLE) {
763 (void)subyte(--ucp, 's');
764 options = 1;
765 }
766 #ifdef notyet
767 if (boothowto & RB_FASTBOOT) {
768 (void)subyte(--ucp, 'f');
769 options = 1;
770 }
771 #endif
772
773 #ifdef BOOTCDROM
774 (void)subyte(--ucp, 'C');
775 options = 1;
776 #endif
777
778 if (options == 0)
779 (void)subyte(--ucp, '-');
780 (void)subyte(--ucp, '-'); /* leading hyphen */
781 arg1 = ucp;
782
783 /*
784 * Move out the file name (also arg 0).
785 */
786 (void)subyte(--ucp, 0);
787 for (s = next - 1; s >= path; s--)
788 (void)subyte(--ucp, *s);
789 arg0 = ucp;
790
791 /*
792 * Move out the arg pointers.
793 */
794 uap = (char **)rounddown2((intptr_t)ucp, sizeof(intptr_t));
795 (void)suword((caddr_t)--uap, (long)0); /* terminator */
796 (void)suword((caddr_t)--uap, (long)(intptr_t)arg1);
797 (void)suword((caddr_t)--uap, (long)(intptr_t)arg0);
798
799 /*
800 * Point at the arguments.
801 */
802 args.fname = arg0;
803 args.argv = uap;
804 args.envv = NULL;
805
806 /*
807 * Now try to exec the program. If can't for any reason
808 * other than it doesn't exist, complain.
809 *
810 * Otherwise, return via fork_trampoline() all the way
811 * to user mode as init!
812 */
813 if ((error = sys_execve(td, &args)) == 0) {
814 mtx_unlock(&Giant);
815 return;
816 }
817 if (error != ENOENT)
818 printf("exec %.*s: error %d\n", (int)(next - path),
819 path, error);
820 }
821 printf("init: not found in path %s\n", init_path);
822 panic("no init");
823 }
824
825 /*
826 * Like kproc_create(), but runs in it's own address space.
827 * We do this early to reserve pid 1.
828 *
829 * Note special case - do not make it runnable yet. Other work
830 * in progress will change this more.
831 */
832 static void
833 create_init(const void *udata __unused)
834 {
835 struct fork_req fr;
836 struct ucred *newcred, *oldcred;
837 struct thread *td;
838 int error;
839
840 bzero(&fr, sizeof(fr));
841 fr.fr_flags = RFFDG | RFPROC | RFSTOPPED;
842 fr.fr_procp = &initproc;
843 error = fork1(&thread0, &fr);
844 if (error)
845 panic("cannot fork init: %d\n", error);
846 KASSERT(initproc->p_pid == 1, ("create_init: initproc->p_pid != 1"));
847 /* divorce init's credentials from the kernel's */
848 newcred = crget();
849 sx_xlock(&proctree_lock);
850 PROC_LOCK(initproc);
851 initproc->p_flag |= P_SYSTEM | P_INMEM;
852 initproc->p_treeflag |= P_TREE_REAPER;
853 LIST_INSERT_HEAD(&initproc->p_reaplist, &proc0, p_reapsibling);
854 oldcred = initproc->p_ucred;
855 crcopy(newcred, oldcred);
856 #ifdef MAC
857 mac_cred_create_init(newcred);
858 #endif
859 #ifdef AUDIT
860 audit_cred_proc1(newcred);
861 #endif
862 proc_set_cred(initproc, newcred);
863 td = FIRST_THREAD_IN_PROC(initproc);
864 crfree(td->td_ucred);
865 td->td_ucred = crhold(initproc->p_ucred);
866 PROC_UNLOCK(initproc);
867 sx_xunlock(&proctree_lock);
868 crfree(oldcred);
869 cpu_fork_kthread_handler(FIRST_THREAD_IN_PROC(initproc),
870 start_init, NULL);
871 }
872 SYSINIT(init, SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL);
873
874 /*
875 * Make it runnable now.
876 */
877 static void
878 kick_init(const void *udata __unused)
879 {
880 struct thread *td;
881
882 td = FIRST_THREAD_IN_PROC(initproc);
883 thread_lock(td);
884 TD_SET_CAN_RUN(td);
885 sched_add(td, SRQ_BORING);
886 thread_unlock(td);
887 }
888 SYSINIT(kickinit, SI_SUB_KTHREAD_INIT, SI_ORDER_MIDDLE, kick_init, NULL);
Cache object: e404dd7bd3b38a0d35f03c22c4a09f13
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