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