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MFC r253604: rename scheduler->swapper and SI_SUB_RUN_SCHEDULER->SI_SUB_LAST
[FreeBSD/stable/9.git] / 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("$FreeBSD$");
46
47 #include "opt_ddb.h"
48 #include "opt_init_path.h"
49
50 #include <sys/param.h>
51 #include <sys/kernel.h>
52 #include <sys/exec.h>
53 #include <sys/file.h>
54 #include <sys/filedesc.h>
55 #include <sys/jail.h>
56 #include <sys/ktr.h>
57 #include <sys/lock.h>
58 #include <sys/loginclass.h>
59 #include <sys/mount.h>
60 #include <sys/mutex.h>
61 #include <sys/syscallsubr.h>
62 #include <sys/sysctl.h>
63 #include <sys/proc.h>
64 #include <sys/racct.h>
65 #include <sys/resourcevar.h>
66 #include <sys/systm.h>
67 #include <sys/signalvar.h>
68 #include <sys/vnode.h>
69 #include <sys/sysent.h>
70 #include <sys/reboot.h>
71 #include <sys/sched.h>
72 #include <sys/sx.h>
73 #include <sys/sysproto.h>
74 #include <sys/vmmeter.h>
75 #include <sys/unistd.h>
76 #include <sys/malloc.h>
77 #include <sys/conf.h>
78 #include <sys/cpuset.h>
79
80 #include <machine/cpu.h>
81
82 #include <security/audit/audit.h>
83 #include <security/mac/mac_framework.h>
84
85 #include <vm/vm.h>
86 #include <vm/vm_param.h>
87 #include <vm/pmap.h>
88 #include <vm/vm_map.h>
89 #include <sys/copyright.h>
90
91 #include <ddb/ddb.h>
92 #include <ddb/db_sym.h>
93
94 void mi_startup(void);                          /* Should be elsewhere */
95
96 /* Components of the first process -- never freed. */
97 static struct session session0;
98 static struct pgrp pgrp0;
99 struct  proc proc0;
100 struct  thread thread0 __aligned(16);
101 struct  vmspace vmspace0;
102 struct  proc *initproc;
103
104 int     boothowto = 0;          /* initialized so that it can be patched */
105 SYSCTL_INT(_debug, OID_AUTO, boothowto, CTLFLAG_RD, &boothowto, 0,
106         "Boot control flags, passed from loader");
107 int     bootverbose;
108 SYSCTL_INT(_debug, OID_AUTO, bootverbose, CTLFLAG_RW, &bootverbose, 0,
109         "Control the output of verbose kernel messages");
110
111 /*
112  * This ensures that there is at least one entry so that the sysinit_set
113  * symbol is not undefined.  A sybsystem ID of SI_SUB_DUMMY is never
114  * executed.
115  */
116 SYSINIT(placeholder, SI_SUB_DUMMY, SI_ORDER_ANY, NULL, NULL);
117
118 /*
119  * The sysinit table itself.  Items are checked off as the are run.
120  * If we want to register new sysinit types, add them to newsysinit.
121  */
122 SET_DECLARE(sysinit_set, struct sysinit);
123 struct sysinit **sysinit, **sysinit_end;
124 struct sysinit **newsysinit, **newsysinit_end;
125
126 /*
127  * Merge a new sysinit set into the current set, reallocating it if
128  * necessary.  This can only be called after malloc is running.
129  */
130 void
131 sysinit_add(struct sysinit **set, struct sysinit **set_end)
132 {
133         struct sysinit **newset;
134         struct sysinit **sipp;
135         struct sysinit **xipp;
136         int count;
137
138         count = set_end - set;
139         if (newsysinit)
140                 count += newsysinit_end - newsysinit;
141         else
142                 count += sysinit_end - sysinit;
143         newset = malloc(count * sizeof(*sipp), M_TEMP, M_NOWAIT);
144         if (newset == NULL)
145                 panic("cannot malloc for sysinit");
146         xipp = newset;
147         if (newsysinit)
148                 for (sipp = newsysinit; sipp < newsysinit_end; sipp++)
149                         *xipp++ = *sipp;
150         else
151                 for (sipp = sysinit; sipp < sysinit_end; sipp++)
152                         *xipp++ = *sipp;
153         for (sipp = set; sipp < set_end; sipp++)
154                 *xipp++ = *sipp;
155         if (newsysinit)
156                 free(newsysinit, M_TEMP);
157         newsysinit = newset;
158         newsysinit_end = newset + count;
159 }
160
161 #if defined (DDB) && defined(VERBOSE_SYSINIT)
162 static const char *
163 symbol_name(vm_offset_t va, db_strategy_t strategy)
164 {
165         const char *name;
166         c_db_sym_t sym;
167         db_expr_t  offset;
168
169         if (va == 0)
170                 return (NULL);
171         sym = db_search_symbol(va, strategy, &offset);
172         if (offset != 0)
173                 return (NULL);
174         db_symbol_values(sym, &name, NULL);
175         return (name);
176 }
177 #endif
178
179 /*
180  * System startup; initialize the world, create process 0, mount root
181  * filesystem, and fork to create init and pagedaemon.  Most of the
182  * hard work is done in the lower-level initialization routines including
183  * startup(), which does memory initialization and autoconfiguration.
184  *
185  * This allows simple addition of new kernel subsystems that require
186  * boot time initialization.  It also allows substitution of subsystem
187  * (for instance, a scheduler, kernel profiler, or VM system) by object
188  * module.  Finally, it allows for optional "kernel threads".
189  */
190 void
191 mi_startup(void)
192 {
193
194         register struct sysinit **sipp;         /* system initialization*/
195         register struct sysinit **xipp;         /* interior loop of sort*/
196         register struct sysinit *save;          /* bubble*/
197
198 #if defined(VERBOSE_SYSINIT)
199         int last;
200         int verbose;
201 #endif
202
203         if (boothowto & RB_VERBOSE)
204                 bootverbose++;
205
206         if (sysinit == NULL) {
207                 sysinit = SET_BEGIN(sysinit_set);
208                 sysinit_end = SET_LIMIT(sysinit_set);
209         }
210
211 restart:
212         /*
213          * Perform a bubble sort of the system initialization objects by
214          * their subsystem (primary key) and order (secondary key).
215          */
216         for (sipp = sysinit; sipp < sysinit_end; sipp++) {
217                 for (xipp = sipp + 1; xipp < sysinit_end; xipp++) {
218                         if ((*sipp)->subsystem < (*xipp)->subsystem ||
219                              ((*sipp)->subsystem == (*xipp)->subsystem &&
220                               (*sipp)->order <= (*xipp)->order))
221                                 continue;       /* skip*/
222                         save = *sipp;
223                         *sipp = *xipp;
224                         *xipp = save;
225                 }
226         }
227
228 #if defined(VERBOSE_SYSINIT)
229         last = SI_SUB_COPYRIGHT;
230         verbose = 0;
231 #if !defined(DDB)
232         printf("VERBOSE_SYSINIT: DDB not enabled, symbol lookups disabled.\n");
233 #endif
234 #endif
235
236         /*
237          * Traverse the (now) ordered list of system initialization tasks.
238          * Perform each task, and continue on to the next task.
239          */
240         for (sipp = sysinit; sipp < sysinit_end; sipp++) {
241
242                 if ((*sipp)->subsystem == SI_SUB_DUMMY)
243                         continue;       /* skip dummy task(s)*/
244
245                 if ((*sipp)->subsystem == SI_SUB_DONE)
246                         continue;
247
248 #if defined(VERBOSE_SYSINIT)
249                 if ((*sipp)->subsystem > last) {
250                         verbose = 1;
251                         last = (*sipp)->subsystem;
252                         printf("subsystem %x\n", last);
253                 }
254                 if (verbose) {
255 #if defined(DDB)
256                         const char *func, *data;
257
258                         func = symbol_name((vm_offset_t)(*sipp)->func,
259                             DB_STGY_PROC);
260                         data = symbol_name((vm_offset_t)(*sipp)->udata,
261                             DB_STGY_ANY);
262                         if (func != NULL && data != NULL)
263                                 printf("   %s(&%s)... ", func, data);
264                         else if (func != NULL)
265                                 printf("   %s(%p)... ", func, (*sipp)->udata);
266                         else
267 #endif
268                                 printf("   %p(%p)... ", (*sipp)->func,
269                                     (*sipp)->udata);
270                 }
271 #endif
272
273                 /* Call function */
274                 (*((*sipp)->func))((*sipp)->udata);
275
276 #if defined(VERBOSE_SYSINIT)
277                 if (verbose)
278                         printf("done.\n");
279 #endif
280
281                 /* Check off the one we're just done */
282                 (*sipp)->subsystem = SI_SUB_DONE;
283
284                 /* Check if we've installed more sysinit items via KLD */
285                 if (newsysinit != NULL) {
286                         if (sysinit != SET_BEGIN(sysinit_set))
287                                 free(sysinit, M_TEMP);
288                         sysinit = newsysinit;
289                         sysinit_end = newsysinit_end;
290                         newsysinit = NULL;
291                         newsysinit_end = NULL;
292                         goto restart;
293                 }
294         }
295
296         mtx_assert(&Giant, MA_OWNED | MA_NOTRECURSED);
297         mtx_unlock(&Giant);
298
299         /*
300          * Now hand over this thread to swapper.
301          */
302         swapper();
303         /* NOTREACHED*/
304 }
305
306
307 /*
308  ***************************************************************************
309  ****
310  **** The following SYSINIT's belong elsewhere, but have not yet
311  **** been moved.
312  ****
313  ***************************************************************************
314  */
315 static void
316 print_caddr_t(void *data)
317 {
318         printf("%s", (char *)data);
319 }
320
321 static void
322 print_version(void *data __unused)
323 {
324         int len;
325
326         /* Strip a trailing newline from version. */
327         len = strlen(version);
328         while (len > 0 && version[len - 1] == '\n')
329                 len--;
330         printf("%.*s %s\n", len, version, machine);
331         printf("%s\n", compiler_version);
332 }
333
334 SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t,
335     copyright);
336 SYSINIT(trademark, SI_SUB_COPYRIGHT, SI_ORDER_SECOND, print_caddr_t,
337     trademark);
338 SYSINIT(version, SI_SUB_COPYRIGHT, SI_ORDER_THIRD, print_version, NULL);
339
340 #ifdef WITNESS
341 static char wit_warn[] =
342      "WARNING: WITNESS option enabled, expect reduced performance.\n";
343 SYSINIT(witwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 1,
344    print_caddr_t, wit_warn);
345 SYSINIT(witwarn2, SI_SUB_LAST, SI_ORDER_THIRD + 1,
346    print_caddr_t, wit_warn);
347 #endif
348
349 #ifdef DIAGNOSTIC
350 static char diag_warn[] =
351      "WARNING: DIAGNOSTIC option enabled, expect reduced performance.\n";
352 SYSINIT(diagwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 2,
353     print_caddr_t, diag_warn);
354 SYSINIT(diagwarn2, SI_SUB_LAST, SI_ORDER_THIRD + 2,
355     print_caddr_t, diag_warn);
356 #endif
357
358 static int
359 null_fetch_syscall_args(struct thread *td __unused,
360     struct syscall_args *sa __unused)
361 {
362
363         panic("null_fetch_syscall_args");
364 }
365
366 static void
367 null_set_syscall_retval(struct thread *td __unused, int error __unused)
368 {
369
370         panic("null_set_syscall_retval");
371 }
372
373 struct sysentvec null_sysvec = {
374         .sv_size        = 0,
375         .sv_table       = NULL,
376         .sv_mask        = 0,
377         .sv_sigsize     = 0,
378         .sv_sigtbl      = NULL,
379         .sv_errsize     = 0,
380         .sv_errtbl      = NULL,
381         .sv_transtrap   = NULL,
382         .sv_fixup       = NULL,
383         .sv_sendsig     = NULL,
384         .sv_sigcode     = NULL,
385         .sv_szsigcode   = NULL,
386         .sv_prepsyscall = NULL,
387         .sv_name        = "null",
388         .sv_coredump    = NULL,
389         .sv_imgact_try  = NULL,
390         .sv_minsigstksz = 0,
391         .sv_pagesize    = PAGE_SIZE,
392         .sv_minuser     = VM_MIN_ADDRESS,
393         .sv_maxuser     = VM_MAXUSER_ADDRESS,
394         .sv_usrstack    = USRSTACK,
395         .sv_psstrings   = PS_STRINGS,
396         .sv_stackprot   = VM_PROT_ALL,
397         .sv_copyout_strings     = NULL,
398         .sv_setregs     = NULL,
399         .sv_fixlimit    = NULL,
400         .sv_maxssiz     = NULL,
401         .sv_flags       = 0,
402         .sv_set_syscall_retval = null_set_syscall_retval,
403         .sv_fetch_syscall_args = null_fetch_syscall_args,
404         .sv_syscallnames = NULL,
405         .sv_schedtail   = NULL,
406 };
407
408 /*
409  ***************************************************************************
410  ****
411  **** The two following SYSINIT's are proc0 specific glue code.  I am not
412  **** convinced that they can not be safely combined, but their order of
413  **** operation has been maintained as the same as the original init_main.c
414  **** for right now.
415  ****
416  **** These probably belong in init_proc.c or kern_proc.c, since they
417  **** deal with proc0 (the fork template process).
418  ****
419  ***************************************************************************
420  */
421 /* ARGSUSED*/
422 static void
423 proc0_init(void *dummy __unused)
424 {
425         struct proc *p;
426         struct thread *td;
427         vm_paddr_t pageablemem;
428         int i;
429
430         GIANT_REQUIRED;
431         p = &proc0;
432         td = &thread0;
433         
434         /*
435          * Initialize magic number and osrel.
436          */
437         p->p_magic = P_MAGIC;
438         p->p_osrel = osreldate;
439
440         /*
441          * Initialize thread and process structures.
442          */
443         procinit();     /* set up proc zone */
444         threadinit();   /* set up UMA zones */
445
446         /*
447          * Initialise scheduler resources.
448          * Add scheduler specific parts to proc, thread as needed.
449          */
450         schedinit();    /* scheduler gets its house in order */
451         /*
452          * Initialize sleep queue hash table
453          */
454         sleepinit();
455
456         /*
457          * additional VM structures
458          */
459         vm_init2();
460
461         /*
462          * Create process 0 (the swapper).
463          */
464         LIST_INSERT_HEAD(&allproc, p, p_list);
465         LIST_INSERT_HEAD(PIDHASH(0), p, p_hash);
466         mtx_init(&pgrp0.pg_mtx, "process group", NULL, MTX_DEF | MTX_DUPOK);
467         p->p_pgrp = &pgrp0;
468         LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash);
469         LIST_INIT(&pgrp0.pg_members);
470         LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist);
471
472         pgrp0.pg_session = &session0;
473         mtx_init(&session0.s_mtx, "session", NULL, MTX_DEF);
474         refcount_init(&session0.s_count, 1);
475         session0.s_leader = p;
476
477         p->p_sysent = &null_sysvec;
478         p->p_flag = P_SYSTEM | P_INMEM;
479         p->p_state = PRS_NORMAL;
480         knlist_init_mtx(&p->p_klist, &p->p_mtx);
481         STAILQ_INIT(&p->p_ktr);
482         p->p_nice = NZERO;
483         /* pid_max cannot be greater than PID_MAX */
484         td->td_tid = PID_MAX + 1;
485         LIST_INSERT_HEAD(TIDHASH(td->td_tid), td, td_hash);
486         td->td_state = TDS_RUNNING;
487         td->td_pri_class = PRI_TIMESHARE;
488         td->td_user_pri = PUSER;
489         td->td_base_user_pri = PUSER;
490         td->td_lend_user_pri = PRI_MAX;
491         td->td_priority = PVM;
492         td->td_base_pri = PVM;
493         td->td_oncpu = 0;
494         td->td_flags = TDF_INMEM|TDP_KTHREAD;
495         td->td_cpuset = cpuset_thread0();
496         prison0.pr_cpuset = cpuset_ref(td->td_cpuset);
497         p->p_peers = 0;
498         p->p_leader = p;
499
500
501         strncpy(p->p_comm, "kernel", sizeof (p->p_comm));
502         strncpy(td->td_name, "swapper", sizeof (td->td_name));
503
504         callout_init_mtx(&p->p_itcallout, &p->p_mtx, 0);
505         callout_init_mtx(&p->p_limco, &p->p_mtx, 0);
506         callout_init(&td->td_slpcallout, CALLOUT_MPSAFE);
507
508         /* Create credentials. */
509         p->p_ucred = crget();
510         p->p_ucred->cr_ngroups = 1;     /* group 0 */
511         p->p_ucred->cr_uidinfo = uifind(0);
512         p->p_ucred->cr_ruidinfo = uifind(0);
513         p->p_ucred->cr_prison = &prison0;
514         p->p_ucred->cr_loginclass = loginclass_find("default");
515 #ifdef AUDIT
516         audit_cred_kproc0(p->p_ucred);
517 #endif
518 #ifdef MAC
519         mac_cred_create_swapper(p->p_ucred);
520 #endif
521         td->td_ucred = crhold(p->p_ucred);
522
523         /* Create sigacts. */
524         p->p_sigacts = sigacts_alloc();
525
526         /* Initialize signal state for process 0. */
527         siginit(&proc0);
528
529         /* Create the file descriptor table. */
530         p->p_fd = fdinit(NULL);
531         p->p_fdtol = NULL;
532
533         /* Create the limits structures. */
534         p->p_limit = lim_alloc();
535         for (i = 0; i < RLIM_NLIMITS; i++)
536                 p->p_limit->pl_rlimit[i].rlim_cur =
537                     p->p_limit->pl_rlimit[i].rlim_max = RLIM_INFINITY;
538         p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_cur =
539             p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles;
540         p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_cur =
541             p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc;
542         p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_cur = dfldsiz;
543         p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_max = maxdsiz;
544         p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_cur = dflssiz;
545         p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_max = maxssiz;
546         /* Cast to avoid overflow on i386/PAE. */
547         pageablemem = ptoa((vm_paddr_t)cnt.v_free_count);
548         p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_cur =
549             p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_max = pageablemem;
550         p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = pageablemem / 3;
551         p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_max = pageablemem;
552         p->p_cpulimit = RLIM_INFINITY;
553
554         /* Initialize resource accounting structures. */
555         racct_create(&p->p_racct);
556
557         p->p_stats = pstats_alloc();
558
559         /* Allocate a prototype map so we have something to fork. */
560         pmap_pinit0(vmspace_pmap(&vmspace0));
561         p->p_vmspace = &vmspace0;
562         vmspace0.vm_refcnt = 1;
563
564         /*
565          * proc0 is not expected to enter usermode, so there is no special
566          * handling for sv_minuser here, like is done for exec_new_vmspace().
567          */
568         vm_map_init(&vmspace0.vm_map, vmspace_pmap(&vmspace0),
569             p->p_sysent->sv_minuser, p->p_sysent->sv_maxuser);
570
571         /*
572          * Call the init and ctor for the new thread and proc.  We wait
573          * to do this until all other structures are fairly sane.
574          */
575         EVENTHANDLER_INVOKE(process_init, p);
576         EVENTHANDLER_INVOKE(thread_init, td);
577         EVENTHANDLER_INVOKE(process_ctor, p);
578         EVENTHANDLER_INVOKE(thread_ctor, td);
579
580         /*
581          * Charge root for one process.
582          */
583         (void)chgproccnt(p->p_ucred->cr_ruidinfo, 1, 0);
584         PROC_LOCK(p);
585         racct_add_force(p, RACCT_NPROC, 1);
586         PROC_UNLOCK(p);
587 }
588 SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL);
589
590 /* ARGSUSED*/
591 static void
592 proc0_post(void *dummy __unused)
593 {
594         struct timespec ts;
595         struct proc *p;
596         struct rusage ru;
597         struct thread *td;
598
599         /*
600          * Now we can look at the time, having had a chance to verify the
601          * time from the filesystem.  Pretend that proc0 started now.
602          */
603         sx_slock(&allproc_lock);
604         FOREACH_PROC_IN_SYSTEM(p) {
605                 microuptime(&p->p_stats->p_start);
606                 PROC_SLOCK(p);
607                 rufetch(p, &ru);        /* Clears thread stats */
608                 PROC_SUNLOCK(p);
609                 p->p_rux.rux_runtime = 0;
610                 p->p_rux.rux_uticks = 0;
611                 p->p_rux.rux_sticks = 0;
612                 p->p_rux.rux_iticks = 0;
613                 FOREACH_THREAD_IN_PROC(p, td) {
614                         td->td_runtime = 0;
615                 }
616         }
617         sx_sunlock(&allproc_lock);
618         PCPU_SET(switchtime, cpu_ticks());
619         PCPU_SET(switchticks, ticks);
620
621         /*
622          * Give the ``random'' number generator a thump.
623          */
624         nanotime(&ts);
625         srandom(ts.tv_sec ^ ts.tv_nsec);
626 }
627 SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL);
628
629 static void
630 random_init(void *dummy __unused)
631 {
632
633         /*
634          * After CPU has been started we have some randomness on most
635          * platforms via get_cyclecount().  For platforms that don't
636          * we will reseed random(9) in proc0_post() as well.
637          */
638         srandom(get_cyclecount());
639 }
640 SYSINIT(random, SI_SUB_RANDOM, SI_ORDER_FIRST, random_init, NULL);
641
642 /*
643  ***************************************************************************
644  ****
645  **** The following SYSINIT's and glue code should be moved to the
646  **** respective files on a per subsystem basis.
647  ****
648  ***************************************************************************
649  */
650
651
652 /*
653  ***************************************************************************
654  ****
655  **** The following code probably belongs in another file, like
656  **** kern/init_init.c.
657  ****
658  ***************************************************************************
659  */
660
661 /*
662  * List of paths to try when searching for "init".
663  */
664 static char init_path[MAXPATHLEN] =
665 #ifdef  INIT_PATH
666     __XSTRING(INIT_PATH);
667 #else
668     "/sbin/init:/sbin/oinit:/sbin/init.bak:/rescue/init:/stand/sysinstall";
669 #endif
670 SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0,
671         "Path used to search the init process");
672
673 /*
674  * Shutdown timeout of init(8).
675  * Unused within kernel, but used to control init(8), hence do not remove.
676  */
677 #ifndef INIT_SHUTDOWN_TIMEOUT
678 #define INIT_SHUTDOWN_TIMEOUT 120
679 #endif
680 static int init_shutdown_timeout = INIT_SHUTDOWN_TIMEOUT;
681 SYSCTL_INT(_kern, OID_AUTO, init_shutdown_timeout,
682         CTLFLAG_RW, &init_shutdown_timeout, 0, "Shutdown timeout of init(8). "
683         "Unused within kernel, but used to control init(8)");
684
685 /*
686  * Start the initial user process; try exec'ing each pathname in init_path.
687  * The program is invoked with one argument containing the boot flags.
688  */
689 static void
690 start_init(void *dummy)
691 {
692         vm_offset_t addr;
693         struct execve_args args;
694         int options, error;
695         char *var, *path, *next, *s;
696         char *ucp, **uap, *arg0, *arg1;
697         struct thread *td;
698         struct proc *p;
699
700         mtx_lock(&Giant);
701
702         GIANT_REQUIRED;
703
704         td = curthread;
705         p = td->td_proc;
706
707         vfs_mountroot();
708
709         /*
710          * Need just enough stack to hold the faked-up "execve()" arguments.
711          */
712         addr = p->p_sysent->sv_usrstack - PAGE_SIZE;
713         if (vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &addr, PAGE_SIZE,
714                         FALSE, VM_PROT_ALL, VM_PROT_ALL, 0) != 0)
715                 panic("init: couldn't allocate argument space");
716         p->p_vmspace->vm_maxsaddr = (caddr_t)addr;
717         p->p_vmspace->vm_ssize = 1;
718
719         if ((var = getenv("init_path")) != NULL) {
720                 strlcpy(init_path, var, sizeof(init_path));
721                 freeenv(var);
722         }
723         
724         for (path = init_path; *path != '\0'; path = next) {
725                 while (*path == ':')
726                         path++;
727                 if (*path == '\0')
728                         break;
729                 for (next = path; *next != '\0' && *next != ':'; next++)
730                         /* nothing */ ;
731                 if (bootverbose)
732                         printf("start_init: trying %.*s\n", (int)(next - path),
733                             path);
734                         
735                 /*
736                  * Move out the boot flag argument.
737                  */
738                 options = 0;
739                 ucp = (char *)p->p_sysent->sv_usrstack;
740                 (void)subyte(--ucp, 0);         /* trailing zero */
741                 if (boothowto & RB_SINGLE) {
742                         (void)subyte(--ucp, 's');
743                         options = 1;
744                 }
745 #ifdef notyet
746                 if (boothowto & RB_FASTBOOT) {
747                         (void)subyte(--ucp, 'f');
748                         options = 1;
749                 }
750 #endif
751
752 #ifdef BOOTCDROM
753                 (void)subyte(--ucp, 'C');
754                 options = 1;
755 #endif
756
757                 if (options == 0)
758                         (void)subyte(--ucp, '-');
759                 (void)subyte(--ucp, '-');               /* leading hyphen */
760                 arg1 = ucp;
761
762                 /*
763                  * Move out the file name (also arg 0).
764                  */
765                 (void)subyte(--ucp, 0);
766                 for (s = next - 1; s >= path; s--)
767                         (void)subyte(--ucp, *s);
768                 arg0 = ucp;
769
770                 /*
771                  * Move out the arg pointers.
772                  */
773                 uap = (char **)((intptr_t)ucp & ~(sizeof(intptr_t)-1));
774                 (void)suword((caddr_t)--uap, (long)0);  /* terminator */
775                 (void)suword((caddr_t)--uap, (long)(intptr_t)arg1);
776                 (void)suword((caddr_t)--uap, (long)(intptr_t)arg0);
777
778                 /*
779                  * Point at the arguments.
780                  */
781                 args.fname = arg0;
782                 args.argv = uap;
783                 args.envv = NULL;
784
785                 /*
786                  * Now try to exec the program.  If can't for any reason
787                  * other than it doesn't exist, complain.
788                  *
789                  * Otherwise, return via fork_trampoline() all the way
790                  * to user mode as init!
791                  */
792                 if ((error = sys_execve(td, &args)) == 0) {
793                         mtx_unlock(&Giant);
794                         return;
795                 }
796                 if (error != ENOENT)
797                         printf("exec %.*s: error %d\n", (int)(next - path), 
798                             path, error);
799         }
800         printf("init: not found in path %s\n", init_path);
801         panic("no init");
802 }
803
804 /*
805  * Like kproc_create(), but runs in it's own address space.
806  * We do this early to reserve pid 1.
807  *
808  * Note special case - do not make it runnable yet.  Other work
809  * in progress will change this more.
810  */
811 static void
812 create_init(const void *udata __unused)
813 {
814         struct ucred *newcred, *oldcred;
815         int error;
816
817         error = fork1(&thread0, RFFDG | RFPROC | RFSTOPPED, 0, &initproc,
818             NULL, 0);
819         if (error)
820                 panic("cannot fork init: %d\n", error);
821         KASSERT(initproc->p_pid == 1, ("create_init: initproc->p_pid != 1"));
822         /* divorce init's credentials from the kernel's */
823         newcred = crget();
824         PROC_LOCK(initproc);
825         initproc->p_flag |= P_SYSTEM | P_INMEM;
826         oldcred = initproc->p_ucred;
827         crcopy(newcred, oldcred);
828 #ifdef MAC
829         mac_cred_create_init(newcred);
830 #endif
831 #ifdef AUDIT
832         audit_cred_proc1(newcred);
833 #endif
834         initproc->p_ucred = newcred;
835         PROC_UNLOCK(initproc);
836         crfree(oldcred);
837         cred_update_thread(FIRST_THREAD_IN_PROC(initproc));
838         cpu_set_fork_handler(FIRST_THREAD_IN_PROC(initproc), start_init, NULL);
839 }
840 SYSINIT(init, SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL);
841
842 /*
843  * Make it runnable now.
844  */
845 static void
846 kick_init(const void *udata __unused)
847 {
848         struct thread *td;
849
850         td = FIRST_THREAD_IN_PROC(initproc);
851         thread_lock(td);
852         TD_SET_CAN_RUN(td);
853         sched_add(td, SRQ_BORING);
854         thread_unlock(td);
855 }
856 SYSINIT(kickinit, SI_SUB_KTHREAD_INIT, SI_ORDER_FIRST, kick_init, NULL);