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("$FreeBSD$");
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 VERBOSE_SYSINIT
121 /*
122 * We'll use the defined value of VERBOSE_SYSINIT from the kernel config to
123 * dictate the default VERBOSE_SYSINIT behavior. Significant values for this
124 * option and associated tunable are:
125 * - 0, 'compiled in but silent by default'
126 * - 1, 'compiled in but verbose by default' (default)
127 */
128 int verbose_sysinit = VERBOSE_SYSINIT;
129 TUNABLE_INT("debug.verbose_sysinit", &verbose_sysinit);
130 #endif
131
132 #ifdef INVARIANTS
133 FEATURE(invariants, "Kernel compiled with INVARIANTS, may affect performance");
134 #endif
135
136 /*
137 * This ensures that there is at least one entry so that the sysinit_set
138 * symbol is not undefined. A sybsystem ID of SI_SUB_DUMMY is never
139 * executed.
140 */
141 SYSINIT(placeholder, SI_SUB_DUMMY, SI_ORDER_ANY, NULL, NULL);
142
143 /*
144 * The sysinit table itself. Items are checked off as the are run.
145 * If we want to register new sysinit types, add them to newsysinit.
146 */
147 SET_DECLARE(sysinit_set, struct sysinit);
148 struct sysinit **sysinit, **sysinit_end;
149 struct sysinit **newsysinit, **newsysinit_end;
150
151 EVENTHANDLER_LIST_DECLARE(process_init);
152 EVENTHANDLER_LIST_DECLARE(thread_init);
153 EVENTHANDLER_LIST_DECLARE(process_ctor);
154 EVENTHANDLER_LIST_DECLARE(thread_ctor);
155
156 /*
157 * Merge a new sysinit set into the current set, reallocating it if
158 * necessary. This can only be called after malloc is running.
159 */
160 void
sysinit_add(struct sysinit ** set,struct sysinit ** set_end)161 sysinit_add(struct sysinit **set, struct sysinit **set_end)
162 {
163 struct sysinit **newset;
164 struct sysinit **sipp;
165 struct sysinit **xipp;
166 int count;
167
168 count = set_end - set;
169 if (newsysinit)
170 count += newsysinit_end - newsysinit;
171 else
172 count += sysinit_end - sysinit;
173 newset = malloc(count * sizeof(*sipp), M_TEMP, M_NOWAIT);
174 if (newset == NULL)
175 panic("cannot malloc for sysinit");
176 xipp = newset;
177 if (newsysinit)
178 for (sipp = newsysinit; sipp < newsysinit_end; sipp++)
179 *xipp++ = *sipp;
180 else
181 for (sipp = sysinit; sipp < sysinit_end; sipp++)
182 *xipp++ = *sipp;
183 for (sipp = set; sipp < set_end; sipp++)
184 *xipp++ = *sipp;
185 if (newsysinit)
186 free(newsysinit, M_TEMP);
187 newsysinit = newset;
188 newsysinit_end = newset + count;
189 }
190
191 #if defined (DDB) && defined(VERBOSE_SYSINIT)
192 static const char *
symbol_name(vm_offset_t va,db_strategy_t strategy)193 symbol_name(vm_offset_t va, db_strategy_t strategy)
194 {
195 const char *name;
196 c_db_sym_t sym;
197 db_expr_t offset;
198
199 if (va == 0)
200 return (NULL);
201 sym = db_search_symbol(va, strategy, &offset);
202 if (offset != 0)
203 return (NULL);
204 db_symbol_values(sym, &name, NULL);
205 return (name);
206 }
207 #endif
208
209 /*
210 * System startup; initialize the world, create process 0, mount root
211 * filesystem, and fork to create init and pagedaemon. Most of the
212 * hard work is done in the lower-level initialization routines including
213 * startup(), which does memory initialization and autoconfiguration.
214 *
215 * This allows simple addition of new kernel subsystems that require
216 * boot time initialization. It also allows substitution of subsystem
217 * (for instance, a scheduler, kernel profiler, or VM system) by object
218 * module. Finally, it allows for optional "kernel threads".
219 */
220 void
mi_startup(void)221 mi_startup(void)
222 {
223
224 register struct sysinit **sipp; /* system initialization*/
225 register struct sysinit **xipp; /* interior loop of sort*/
226 register struct sysinit *save; /* bubble*/
227
228 #if defined(VERBOSE_SYSINIT)
229 int last;
230 int verbose;
231 #endif
232
233 if (boothowto & RB_VERBOSE)
234 bootverbose++;
235
236 if (sysinit == NULL) {
237 sysinit = SET_BEGIN(sysinit_set);
238 sysinit_end = SET_LIMIT(sysinit_set);
239 }
240
241 restart:
242 /*
243 * Perform a bubble sort of the system initialization objects by
244 * their subsystem (primary key) and order (secondary key).
245 */
246 for (sipp = sysinit; sipp < sysinit_end; sipp++) {
247 for (xipp = sipp + 1; xipp < sysinit_end; xipp++) {
248 if ((*sipp)->subsystem < (*xipp)->subsystem ||
249 ((*sipp)->subsystem == (*xipp)->subsystem &&
250 (*sipp)->order <= (*xipp)->order))
251 continue; /* skip*/
252 save = *sipp;
253 *sipp = *xipp;
254 *xipp = save;
255 }
256 }
257
258 #if defined(VERBOSE_SYSINIT)
259 last = SI_SUB_COPYRIGHT;
260 verbose = 0;
261 #if !defined(DDB)
262 printf("VERBOSE_SYSINIT: DDB not enabled, symbol lookups disabled.\n");
263 #endif
264 #endif
265
266 /*
267 * Traverse the (now) ordered list of system initialization tasks.
268 * Perform each task, and continue on to the next task.
269 */
270 for (sipp = sysinit; sipp < sysinit_end; sipp++) {
271
272 if ((*sipp)->subsystem == SI_SUB_DUMMY)
273 continue; /* skip dummy task(s)*/
274
275 if ((*sipp)->subsystem == SI_SUB_DONE)
276 continue;
277
278 #if defined(VERBOSE_SYSINIT)
279 if ((*sipp)->subsystem > last && verbose_sysinit != 0) {
280 verbose = 1;
281 last = (*sipp)->subsystem;
282 printf("subsystem %x\n", last);
283 }
284 if (verbose) {
285 #if defined(DDB)
286 const char *func, *data;
287
288 func = symbol_name((vm_offset_t)(*sipp)->func,
289 DB_STGY_PROC);
290 data = symbol_name((vm_offset_t)(*sipp)->udata,
291 DB_STGY_ANY);
292 if (func != NULL && data != NULL)
293 printf(" %s(&%s)... ", func, data);
294 else if (func != NULL)
295 printf(" %s(%p)... ", func, (*sipp)->udata);
296 else
297 #endif
298 printf(" %p(%p)... ", (*sipp)->func,
299 (*sipp)->udata);
300 }
301 #endif
302
303 /* Call function */
304 (*((*sipp)->func))((*sipp)->udata);
305
306 #if defined(VERBOSE_SYSINIT)
307 if (verbose)
308 printf("done.\n");
309 #endif
310
311 /* Check off the one we're just done */
312 (*sipp)->subsystem = SI_SUB_DONE;
313
314 /* Check if we've installed more sysinit items via KLD */
315 if (newsysinit != NULL) {
316 if (sysinit != SET_BEGIN(sysinit_set))
317 free(sysinit, M_TEMP);
318 sysinit = newsysinit;
319 sysinit_end = newsysinit_end;
320 newsysinit = NULL;
321 newsysinit_end = NULL;
322 goto restart;
323 }
324 }
325
326 mtx_assert(&Giant, MA_OWNED | MA_NOTRECURSED);
327 mtx_unlock(&Giant);
328
329 /*
330 * Now hand over this thread to swapper.
331 */
332 swapper();
333 /* NOTREACHED*/
334 }
335
336
337 /*
338 ***************************************************************************
339 ****
340 **** The following SYSINIT's belong elsewhere, but have not yet
341 **** been moved.
342 ****
343 ***************************************************************************
344 */
345 static void
print_caddr_t(void * data)346 print_caddr_t(void *data)
347 {
348 printf("%s", (char *)data);
349 }
350
351 static void
print_version(void * data __unused)352 print_version(void *data __unused)
353 {
354 int len;
355
356 /* Strip a trailing newline from version. */
357 len = strlen(version);
358 while (len > 0 && version[len - 1] == '\n')
359 len--;
360 printf("%.*s %s\n", len, version, machine);
361 printf("%s\n", compiler_version);
362 }
363
364 SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t,
365 copyright);
366 SYSINIT(trademark, SI_SUB_COPYRIGHT, SI_ORDER_SECOND, print_caddr_t,
367 trademark);
368 SYSINIT(version, SI_SUB_COPYRIGHT, SI_ORDER_THIRD, print_version, NULL);
369
370 #ifdef WITNESS
371 static char wit_warn[] =
372 "WARNING: WITNESS option enabled, expect reduced performance.\n";
373 SYSINIT(witwarn, SI_SUB_COPYRIGHT, SI_ORDER_FOURTH,
374 print_caddr_t, wit_warn);
375 SYSINIT(witwarn2, SI_SUB_LAST, SI_ORDER_FOURTH,
376 print_caddr_t, wit_warn);
377 #endif
378
379 #ifdef DIAGNOSTIC
380 static char diag_warn[] =
381 "WARNING: DIAGNOSTIC option enabled, expect reduced performance.\n";
382 SYSINIT(diagwarn, SI_SUB_COPYRIGHT, SI_ORDER_FIFTH,
383 print_caddr_t, diag_warn);
384 SYSINIT(diagwarn2, SI_SUB_LAST, SI_ORDER_FIFTH,
385 print_caddr_t, diag_warn);
386 #endif
387
388 static int
null_fetch_syscall_args(struct thread * td __unused)389 null_fetch_syscall_args(struct thread *td __unused)
390 {
391
392 panic("null_fetch_syscall_args");
393 }
394
395 static void
null_set_syscall_retval(struct thread * td __unused,int error __unused)396 null_set_syscall_retval(struct thread *td __unused, int error __unused)
397 {
398
399 panic("null_set_syscall_retval");
400 }
401
402 struct sysentvec null_sysvec = {
403 .sv_size = 0,
404 .sv_table = NULL,
405 .sv_mask = 0,
406 .sv_errsize = 0,
407 .sv_errtbl = 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_pagesize = PAGE_SIZE,
418 .sv_minuser = VM_MIN_ADDRESS,
419 .sv_maxuser = VM_MAXUSER_ADDRESS,
420 .sv_usrstack = USRSTACK,
421 .sv_psstrings = PS_STRINGS,
422 .sv_stackprot = VM_PROT_ALL,
423 .sv_copyout_strings = NULL,
424 .sv_setregs = NULL,
425 .sv_fixlimit = NULL,
426 .sv_maxssiz = NULL,
427 .sv_flags = 0,
428 .sv_set_syscall_retval = null_set_syscall_retval,
429 .sv_fetch_syscall_args = null_fetch_syscall_args,
430 .sv_syscallnames = NULL,
431 .sv_schedtail = NULL,
432 .sv_thread_detach = NULL,
433 .sv_trap = NULL,
434 };
435
436 /*
437 ***************************************************************************
438 ****
439 **** The two following SYSINIT's are proc0 specific glue code. I am not
440 **** convinced that they can not be safely combined, but their order of
441 **** operation has been maintained as the same as the original init_main.c
442 **** for right now.
443 ****
444 **** These probably belong in init_proc.c or kern_proc.c, since they
445 **** deal with proc0 (the fork template process).
446 ****
447 ***************************************************************************
448 */
449 /* ARGSUSED*/
450 static void
proc0_init(void * dummy __unused)451 proc0_init(void *dummy __unused)
452 {
453 struct proc *p;
454 struct thread *td;
455 struct ucred *newcred;
456 vm_paddr_t pageablemem;
457 int i;
458
459 GIANT_REQUIRED;
460 p = &proc0;
461 td = &thread0;
462
463 /*
464 * Initialize magic number and osrel.
465 */
466 p->p_magic = P_MAGIC;
467 p->p_osrel = osreldate;
468
469 /*
470 * Initialize thread and process structures.
471 */
472 procinit(); /* set up proc zone */
473 threadinit(); /* set up UMA zones */
474
475 /*
476 * Initialise scheduler resources.
477 * Add scheduler specific parts to proc, thread as needed.
478 */
479 schedinit(); /* scheduler gets its house in order */
480
481 /*
482 * Create process 0 (the swapper).
483 */
484 LIST_INSERT_HEAD(&allproc, p, p_list);
485 LIST_INSERT_HEAD(PIDHASH(0), p, p_hash);
486 mtx_init(&pgrp0.pg_mtx, "process group", NULL, MTX_DEF | MTX_DUPOK);
487 p->p_pgrp = &pgrp0;
488 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash);
489 LIST_INIT(&pgrp0.pg_members);
490 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist);
491
492 pgrp0.pg_session = &session0;
493 mtx_init(&session0.s_mtx, "session", NULL, MTX_DEF);
494 refcount_init(&session0.s_count, 1);
495 session0.s_leader = p;
496
497 p->p_sysent = &null_sysvec;
498 p->p_flag = P_SYSTEM | P_INMEM | P_KPROC;
499 p->p_flag2 = 0;
500 p->p_state = PRS_NORMAL;
501 p->p_klist = knlist_alloc(&p->p_mtx);
502 STAILQ_INIT(&p->p_ktr);
503 p->p_nice = NZERO;
504 /* pid_max cannot be greater than PID_MAX */
505 td->td_tid = PID_MAX + 1;
506 LIST_INSERT_HEAD(TIDHASH(td->td_tid), td, td_hash);
507 td->td_state = TDS_RUNNING;
508 td->td_pri_class = PRI_TIMESHARE;
509 td->td_user_pri = PUSER;
510 td->td_base_user_pri = PUSER;
511 td->td_lend_user_pri = PRI_MAX;
512 td->td_priority = PVM;
513 td->td_base_pri = PVM;
514 td->td_oncpu = 0;
515 td->td_flags = TDF_INMEM;
516 td->td_pflags = TDP_KTHREAD;
517 td->td_cpuset = cpuset_thread0();
518 vm_domain_policy_init(&td->td_vm_dom_policy);
519 vm_domain_policy_set(&td->td_vm_dom_policy, VM_POLICY_NONE, -1);
520 vm_domain_policy_init(&p->p_vm_dom_policy);
521 vm_domain_policy_set(&p->p_vm_dom_policy, VM_POLICY_NONE, -1);
522 prison0_init();
523 p->p_peers = 0;
524 p->p_leader = p;
525 p->p_reaper = p;
526 LIST_INIT(&p->p_reaplist);
527
528 strncpy(p->p_comm, "kernel", sizeof (p->p_comm));
529 strncpy(td->td_name, "swapper", sizeof (td->td_name));
530
531 callout_init_mtx(&p->p_itcallout, &p->p_mtx, 0);
532 callout_init_mtx(&p->p_limco, &p->p_mtx, 0);
533 callout_init(&td->td_slpcallout, 1);
534
535 /* Create credentials. */
536 newcred = crget();
537 newcred->cr_ngroups = 1; /* group 0 */
538 newcred->cr_uidinfo = uifind(0);
539 newcred->cr_ruidinfo = uifind(0);
540 newcred->cr_prison = &prison0;
541 newcred->cr_loginclass = loginclass_find("default");
542 proc_set_cred_init(p, newcred);
543 #ifdef AUDIT
544 audit_cred_kproc0(newcred);
545 #endif
546 #ifdef MAC
547 mac_cred_create_swapper(newcred);
548 #endif
549 /* Create sigacts. */
550 p->p_sigacts = sigacts_alloc();
551
552 /* Initialize signal state for process 0. */
553 siginit(&proc0);
554
555 /* Create the file descriptor table. */
556 p->p_fd = fdinit(NULL, false);
557 p->p_fdtol = NULL;
558
559 /* Create the limits structures. */
560 p->p_limit = lim_alloc();
561 for (i = 0; i < RLIM_NLIMITS; i++)
562 p->p_limit->pl_rlimit[i].rlim_cur =
563 p->p_limit->pl_rlimit[i].rlim_max = RLIM_INFINITY;
564 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_cur =
565 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles;
566 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_cur =
567 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc;
568 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_cur = dfldsiz;
569 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_max = maxdsiz;
570 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_cur = dflssiz;
571 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_max = maxssiz;
572 /* Cast to avoid overflow on i386/PAE. */
573 pageablemem = ptoa((vm_paddr_t)vm_cnt.v_free_count);
574 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_cur =
575 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_max = pageablemem;
576 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = pageablemem / 3;
577 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_max = pageablemem;
578 p->p_cpulimit = RLIM_INFINITY;
579
580 PROC_LOCK(p);
581 thread_cow_get_proc(td, p);
582 PROC_UNLOCK(p);
583
584 /* Initialize resource accounting structures. */
585 racct_create(&p->p_racct);
586
587 p->p_stats = pstats_alloc();
588
589 /* Allocate a prototype map so we have something to fork. */
590 p->p_vmspace = &vmspace0;
591 vmspace0.vm_refcnt = 1;
592 pmap_pinit0(vmspace_pmap(&vmspace0));
593
594 /*
595 * proc0 is not expected to enter usermode, so there is no special
596 * handling for sv_minuser here, like is done for exec_new_vmspace().
597 */
598 vm_map_init(&vmspace0.vm_map, vmspace_pmap(&vmspace0),
599 p->p_sysent->sv_minuser, p->p_sysent->sv_maxuser);
600
601 /*
602 * Call the init and ctor for the new thread and proc. We wait
603 * to do this until all other structures are fairly sane.
604 */
605 EVENTHANDLER_DIRECT_INVOKE(process_init, p);
606 EVENTHANDLER_DIRECT_INVOKE(thread_init, td);
607 EVENTHANDLER_DIRECT_INVOKE(process_ctor, p);
608 EVENTHANDLER_DIRECT_INVOKE(thread_ctor, td);
609
610 /*
611 * Charge root for one process.
612 */
613 (void)chgproccnt(p->p_ucred->cr_ruidinfo, 1, 0);
614 PROC_LOCK(p);
615 racct_add_force(p, RACCT_NPROC, 1);
616 PROC_UNLOCK(p);
617 }
618 SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL);
619
620 /* ARGSUSED*/
621 static void
proc0_post(void * dummy __unused)622 proc0_post(void *dummy __unused)
623 {
624 struct timespec ts;
625 struct proc *p;
626 struct rusage ru;
627 struct thread *td;
628
629 /*
630 * Now we can look at the time, having had a chance to verify the
631 * time from the filesystem. Pretend that proc0 started now.
632 */
633 sx_slock(&allproc_lock);
634 FOREACH_PROC_IN_SYSTEM(p) {
635 PROC_LOCK(p);
636 if (p->p_state == PRS_NEW) {
637 PROC_UNLOCK(p);
638 continue;
639 }
640 microuptime(&p->p_stats->p_start);
641 PROC_STATLOCK(p);
642 rufetch(p, &ru); /* Clears thread stats */
643 p->p_rux.rux_runtime = 0;
644 p->p_rux.rux_uticks = 0;
645 p->p_rux.rux_sticks = 0;
646 p->p_rux.rux_iticks = 0;
647 PROC_STATUNLOCK(p);
648 FOREACH_THREAD_IN_PROC(p, td) {
649 td->td_runtime = 0;
650 }
651 PROC_UNLOCK(p);
652 }
653 sx_sunlock(&allproc_lock);
654 PCPU_SET(switchtime, cpu_ticks());
655 PCPU_SET(switchticks, ticks);
656
657 /*
658 * Give the ``random'' number generator a thump.
659 */
660 nanotime(&ts);
661 srandom(ts.tv_sec ^ ts.tv_nsec);
662 }
663 SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL);
664
665 static void
random_init(void * dummy __unused)666 random_init(void *dummy __unused)
667 {
668
669 /*
670 * After CPU has been started we have some randomness on most
671 * platforms via get_cyclecount(). For platforms that don't
672 * we will reseed random(9) in proc0_post() as well.
673 */
674 srandom(get_cyclecount());
675 }
676 SYSINIT(random, SI_SUB_RANDOM, SI_ORDER_FIRST, random_init, NULL);
677
678 /*
679 ***************************************************************************
680 ****
681 **** The following SYSINIT's and glue code should be moved to the
682 **** respective files on a per subsystem basis.
683 ****
684 ***************************************************************************
685 */
686
687
688 /*
689 ***************************************************************************
690 ****
691 **** The following code probably belongs in another file, like
692 **** kern/init_init.c.
693 ****
694 ***************************************************************************
695 */
696
697 /*
698 * List of paths to try when searching for "init".
699 */
700 static char init_path[MAXPATHLEN] =
701 #ifdef INIT_PATH
702 __XSTRING(INIT_PATH);
703 #else
704 "/sbin/init:/sbin/oinit:/sbin/init.bak:/rescue/init";
705 #endif
706 SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0,
707 "Path used to search the init process");
708
709 /*
710 * Shutdown timeout of init(8).
711 * Unused within kernel, but used to control init(8), hence do not remove.
712 */
713 #ifndef INIT_SHUTDOWN_TIMEOUT
714 #define INIT_SHUTDOWN_TIMEOUT 120
715 #endif
716 static int init_shutdown_timeout = INIT_SHUTDOWN_TIMEOUT;
717 SYSCTL_INT(_kern, OID_AUTO, init_shutdown_timeout,
718 CTLFLAG_RW, &init_shutdown_timeout, 0, "Shutdown timeout of init(8). "
719 "Unused within kernel, but used to control init(8)");
720
721 /*
722 * Start the initial user process; try exec'ing each pathname in init_path.
723 * The program is invoked with one argument containing the boot flags.
724 */
725 static void
start_init(void * dummy)726 start_init(void *dummy)
727 {
728 vm_offset_t addr;
729 struct execve_args args;
730 int options, error;
731 char *var, *path, *next, *s;
732 char *ucp, **uap, *arg0, *arg1;
733 struct thread *td;
734 struct proc *p;
735
736 mtx_lock(&Giant);
737
738 GIANT_REQUIRED;
739
740 td = curthread;
741 p = td->td_proc;
742
743 vfs_mountroot();
744
745 /* Wipe GELI passphrase from the environment. */
746 kern_unsetenv("kern.geom.eli.passphrase");
747
748 /*
749 * Need just enough stack to hold the faked-up "execve()" arguments.
750 */
751 addr = p->p_sysent->sv_usrstack - PAGE_SIZE;
752 if (vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &addr, PAGE_SIZE, 0,
753 VMFS_NO_SPACE, VM_PROT_ALL, VM_PROT_ALL, 0) != 0)
754 panic("init: couldn't allocate argument space");
755 p->p_vmspace->vm_maxsaddr = (caddr_t)addr;
756 p->p_vmspace->vm_ssize = 1;
757
758 if ((var = kern_getenv("init_path")) != NULL) {
759 strlcpy(init_path, var, sizeof(init_path));
760 freeenv(var);
761 }
762
763 for (path = init_path; *path != '\0'; path = next) {
764 while (*path == ':')
765 path++;
766 if (*path == '\0')
767 break;
768 for (next = path; *next != '\0' && *next != ':'; next++)
769 /* nothing */ ;
770 if (bootverbose)
771 printf("start_init: trying %.*s\n", (int)(next - path),
772 path);
773
774 /*
775 * Move out the boot flag argument.
776 */
777 options = 0;
778 ucp = (char *)p->p_sysent->sv_usrstack;
779 (void)subyte(--ucp, 0); /* trailing zero */
780 if (boothowto & RB_SINGLE) {
781 (void)subyte(--ucp, 's');
782 options = 1;
783 }
784 #ifdef notyet
785 if (boothowto & RB_FASTBOOT) {
786 (void)subyte(--ucp, 'f');
787 options = 1;
788 }
789 #endif
790
791 #ifdef BOOTCDROM
792 (void)subyte(--ucp, 'C');
793 options = 1;
794 #endif
795
796 if (options == 0)
797 (void)subyte(--ucp, '-');
798 (void)subyte(--ucp, '-'); /* leading hyphen */
799 arg1 = ucp;
800
801 /*
802 * Move out the file name (also arg 0).
803 */
804 (void)subyte(--ucp, 0);
805 for (s = next - 1; s >= path; s--)
806 (void)subyte(--ucp, *s);
807 arg0 = ucp;
808
809 /*
810 * Move out the arg pointers.
811 */
812 uap = (char **)rounddown2((intptr_t)ucp, sizeof(intptr_t));
813 (void)suword((caddr_t)--uap, (long)0); /* terminator */
814 (void)suword((caddr_t)--uap, (long)(intptr_t)arg1);
815 (void)suword((caddr_t)--uap, (long)(intptr_t)arg0);
816
817 /*
818 * Point at the arguments.
819 */
820 args.fname = arg0;
821 args.argv = uap;
822 args.envv = NULL;
823
824 /*
825 * Now try to exec the program. If can't for any reason
826 * other than it doesn't exist, complain.
827 *
828 * Otherwise, return via fork_trampoline() all the way
829 * to user mode as init!
830 */
831 if ((error = sys_execve(td, &args)) == 0) {
832 mtx_unlock(&Giant);
833 return;
834 }
835 if (error != ENOENT)
836 printf("exec %.*s: error %d\n", (int)(next - path),
837 path, error);
838 }
839 printf("init: not found in path %s\n", init_path);
840 panic("no init");
841 }
842
843 /*
844 * Like kproc_create(), but runs in its own address space. We do this
845 * early to reserve pid 1. Note special case - do not make it
846 * runnable yet, init execution is started when userspace can be served.
847 */
848 static void
create_init(const void * udata __unused)849 create_init(const void *udata __unused)
850 {
851 struct fork_req fr;
852 struct ucred *newcred, *oldcred;
853 struct thread *td;
854 int error;
855
856 bzero(&fr, sizeof(fr));
857 fr.fr_flags = RFFDG | RFPROC | RFSTOPPED;
858 fr.fr_procp = &initproc;
859 error = fork1(&thread0, &fr);
860 if (error)
861 panic("cannot fork init: %d\n", error);
862 KASSERT(initproc->p_pid == 1, ("create_init: initproc->p_pid != 1"));
863 /* divorce init's credentials from the kernel's */
864 newcred = crget();
865 sx_xlock(&proctree_lock);
866 PROC_LOCK(initproc);
867 initproc->p_flag |= P_SYSTEM | P_INMEM;
868 initproc->p_treeflag |= P_TREE_REAPER;
869 LIST_INSERT_HEAD(&initproc->p_reaplist, &proc0, p_reapsibling);
870 oldcred = initproc->p_ucred;
871 crcopy(newcred, oldcred);
872 #ifdef MAC
873 mac_cred_create_init(newcred);
874 #endif
875 #ifdef AUDIT
876 audit_cred_proc1(newcred);
877 #endif
878 proc_set_cred(initproc, newcred);
879 td = FIRST_THREAD_IN_PROC(initproc);
880 crfree(td->td_ucred);
881 td->td_ucred = crhold(initproc->p_ucred);
882 PROC_UNLOCK(initproc);
883 sx_xunlock(&proctree_lock);
884 crfree(oldcred);
885 cpu_fork_kthread_handler(FIRST_THREAD_IN_PROC(initproc),
886 start_init, NULL);
887 }
888 SYSINIT(init, SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL);
889
890 /*
891 * Make it runnable now.
892 */
893 static void
kick_init(const void * udata __unused)894 kick_init(const void *udata __unused)
895 {
896 struct thread *td;
897
898 td = FIRST_THREAD_IN_PROC(initproc);
899 thread_lock(td);
900 TD_SET_CAN_RUN(td);
901 sched_add(td, SRQ_BORING);
902 thread_unlock(td);
903 }
904 SYSINIT(kickinit, SI_SUB_KTHREAD_INIT, SI_ORDER_MIDDLE, kick_init, NULL);
905