1 /*-
2 * SPDX-License-Identifier: BSD-4-Clause
3 *
4 * Copyright (c) 1995 Terrence R. Lambert
5 * All rights reserved.
6 *
7 * Copyright (c) 1982, 1986, 1989, 1991, 1992, 1993
8 * The Regents of the University of California. All rights reserved.
9 * (c) UNIX System Laboratories, Inc.
10 * All or some portions of this file are derived from material licensed
11 * to the University of California by American Telephone and Telegraph
12 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
13 * the permission of UNIX System Laboratories, Inc.
14 *
15 * Redistribution and use in source and binary forms, with or without
16 * modification, are permitted provided that the following conditions
17 * are met:
18 * 1. Redistributions of source code must retain the above copyright
19 * notice, this list of conditions and the following disclaimer.
20 * 2. Redistributions in binary form must reproduce the above copyright
21 * notice, this list of conditions and the following disclaimer in the
22 * documentation and/or other materials provided with the distribution.
23 * 3. All advertising materials mentioning features or use of this software
24 * must display the following acknowledgement:
25 * This product includes software developed by the University of
26 * California, Berkeley and its contributors.
27 * 4. Neither the name of the University nor the names of its contributors
28 * may be used to endorse or promote products derived from this software
29 * without specific prior written permission.
30 *
31 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
32 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
33 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
34 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
35 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
39 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
40 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
41 * SUCH DAMAGE.
42 */
43
44 #include "opt_ddb.h"
45 #include "opt_kdb.h"
46 #include "opt_init_path.h"
47 #include "opt_verbose_sysinit.h"
48
49 #include <sys/param.h>
50 #include <sys/systm.h>
51 #include <sys/boottrace.h>
52 #include <sys/conf.h>
53 #include <sys/cpuset.h>
54 #include <sys/dtrace_bsd.h>
55 #include <sys/epoch.h>
56 #include <sys/eventhandler.h>
57 #include <sys/exec.h>
58 #include <sys/file.h>
59 #include <sys/filedesc.h>
60 #include <sys/imgact.h>
61 #include <sys/jail.h>
62 #include <sys/kernel.h>
63 #include <sys/ktr.h>
64 #include <sys/lock.h>
65 #include <sys/loginclass.h>
66 #include <sys/malloc.h>
67 #include <sys/mount.h>
68 #include <sys/mutex.h>
69 #include <sys/proc.h>
70 #include <sys/racct.h>
71 #include <sys/reboot.h>
72 #include <sys/resourcevar.h>
73 #include <sys/queue.h>
74 #include <sys/queue_mergesort.h>
75 #include <sys/sched.h>
76 #include <sys/signalvar.h>
77 #include <sys/sx.h>
78 #include <sys/syscallsubr.h>
79 #include <sys/sysctl.h>
80 #include <sys/sysent.h>
81 #include <sys/sysproto.h>
82 #include <sys/unistd.h>
83 #include <sys/vmmeter.h>
84 #include <sys/vnode.h>
85
86 #include <machine/cpu.h>
87
88 #include <security/audit/audit.h>
89 #include <security/mac/mac_framework.h>
90
91 #include <vm/vm.h>
92 #include <vm/vm_param.h>
93 #include <vm/vm_extern.h>
94 #include <vm/pmap.h>
95 #include <vm/vm_map.h>
96 #include <sys/copyright.h>
97
98 #include <ddb/ddb.h>
99 #include <ddb/db_sym.h>
100
101 void mi_startup(void); /* Should be elsewhere */
102
103 /* Components of the first process -- never freed. */
104 static struct session session0;
105 static struct pgrp pgrp0;
106 struct proc proc0;
107 struct thread0_storage thread0_st __aligned(32);
108 struct vmspace vmspace0;
109 struct proc *initproc;
110
111 int
linux_alloc_current_noop(struct thread * td __unused,int flags __unused)112 linux_alloc_current_noop(struct thread *td __unused, int flags __unused)
113 {
114 return (0);
115 }
116 int (*lkpi_alloc_current)(struct thread *, int) = linux_alloc_current_noop;
117
118 #ifndef BOOTHOWTO
119 #define BOOTHOWTO 0
120 #endif
121 int boothowto = BOOTHOWTO; /* initialized so that it can be patched */
122 SYSCTL_INT(_debug, OID_AUTO, boothowto, CTLFLAG_RD, &boothowto, 0,
123 "Boot control flags, passed from loader");
124
125 #ifndef BOOTVERBOSE
126 #define BOOTVERBOSE 0
127 #endif
128 int bootverbose = BOOTVERBOSE;
129 SYSCTL_INT(_debug, OID_AUTO, bootverbose, CTLFLAG_RW, &bootverbose, 0,
130 "Control the output of verbose kernel messages");
131
132 #ifdef VERBOSE_SYSINIT
133 /*
134 * We'll use the defined value of VERBOSE_SYSINIT from the kernel config to
135 * dictate the default VERBOSE_SYSINIT behavior. Significant values for this
136 * option and associated tunable are:
137 * - 0, 'compiled in but silent by default'
138 * - 1, 'compiled in but verbose by default' (default)
139 */
140 int verbose_sysinit = VERBOSE_SYSINIT;
141 TUNABLE_INT("debug.verbose_sysinit", &verbose_sysinit);
142 #endif
143
144 #ifdef INVARIANTS
145 FEATURE(invariants, "Kernel compiled with INVARIANTS, may affect performance");
146 #endif
147
148 /*
149 * This ensures that there is at least one entry so that the sysinit_set
150 * symbol is not undefined. A sybsystem ID of SI_SUB_DUMMY is never
151 * executed.
152 */
153 SYSINIT(placeholder, SI_SUB_DUMMY, SI_ORDER_ANY, NULL, NULL);
154
155 /*
156 * The sysinit linker set compiled into the kernel. These are placed onto the
157 * sysinit list by mi_startup; sysinit_add can add (e.g., from klds) additional
158 * sysinits to the linked list but the linker set here does not change.
159 */
160 SET_DECLARE(sysinit_set, struct sysinit);
161
162 /*
163 * The sysinit lists. Items are moved to sysinit_done_list when done.
164 */
165 static STAILQ_HEAD(sysinitlist, sysinit) sysinit_list;
166 static struct sysinitlist sysinit_done_list =
167 STAILQ_HEAD_INITIALIZER(sysinit_done_list);
168
169 /*
170 * Compare two sysinits; return -1, 0, or 1 if a comes before, at the same time
171 * as, or after b.
172 */
173 static int
sysinit_compar(struct sysinit * a,struct sysinit * b,void * thunk __unused)174 sysinit_compar(struct sysinit *a, struct sysinit *b, void *thunk __unused)
175 {
176
177 if (a->subsystem < b->subsystem)
178 return (-1);
179 if (a->subsystem > b->subsystem)
180 return (1);
181 if (a->order < b->order)
182 return (-1);
183 if (a->order > b->order)
184 return (1);
185 return (0);
186 }
187
188 static void
sysinit_mklist(struct sysinitlist * list,struct sysinit ** set,struct sysinit ** set_end)189 sysinit_mklist(struct sysinitlist *list, struct sysinit **set,
190 struct sysinit **set_end)
191 {
192 struct sysinit **sipp;
193
194 TSENTER();
195 TSENTER2("listify");
196 STAILQ_INIT(list);
197 for (sipp = set; sipp < set_end; sipp++)
198 STAILQ_INSERT_TAIL(list, *sipp, next);
199 TSEXIT2("listify");
200 TSENTER2("mergesort");
201 STAILQ_MERGESORT(list, NULL, sysinit_compar, sysinit, next);
202 TSEXIT2("mergesort");
203 TSEXIT();
204 }
205
206 /*
207 * Merge a new sysinit set into the sysinit list.
208 */
209 void
sysinit_add(struct sysinit ** set,struct sysinit ** set_end)210 sysinit_add(struct sysinit **set, struct sysinit **set_end)
211 {
212 struct sysinitlist new_list;
213
214 TSENTER();
215
216 /* Construct a sorted list from the new sysinits. */
217 sysinit_mklist(&new_list, set, set_end);
218
219 /* Merge the new list into the existing one. */
220 TSENTER2("STAILQ_MERGE");
221 STAILQ_MERGE(&sysinit_list, &new_list, NULL, sysinit_compar, sysinit, next);
222 TSEXIT2("STAILQ_MERGE");
223
224 TSEXIT();
225 }
226
227 #if defined (DDB) && defined(VERBOSE_SYSINIT)
228 static const char *
symbol_name(vm_offset_t va,db_strategy_t strategy)229 symbol_name(vm_offset_t va, db_strategy_t strategy)
230 {
231 const char *name;
232 c_db_sym_t sym;
233 db_expr_t offset;
234
235 if (va == 0)
236 return (NULL);
237 sym = db_search_symbol(va, strategy, &offset);
238 if (offset != 0)
239 return (NULL);
240 db_symbol_values(sym, &name, NULL);
241 return (name);
242 }
243 #endif
244
245 /*
246 * System startup; initialize the world, create process 0, mount root
247 * filesystem, and fork to create init and pagedaemon. Most of the
248 * hard work is done in the lower-level initialization routines including
249 * startup(), which does memory initialization and autoconfiguration.
250 *
251 * This allows simple addition of new kernel subsystems that require
252 * boot time initialization. It also allows substitution of subsystem
253 * (for instance, a scheduler, kernel profiler, or VM system) by object
254 * module. Finally, it allows for optional "kernel threads".
255 */
256 void
mi_startup(void)257 mi_startup(void)
258 {
259
260 struct sysinit *sip;
261 int last;
262 #if defined(VERBOSE_SYSINIT)
263 int verbose;
264 #endif
265
266 TSENTER();
267
268 if (boothowto & RB_VERBOSE)
269 bootverbose++;
270
271 /* Construct and sort sysinit list. */
272 sysinit_mklist(&sysinit_list, SET_BEGIN(sysinit_set), SET_LIMIT(sysinit_set));
273
274 last = SI_SUB_COPYRIGHT;
275 #if defined(VERBOSE_SYSINIT)
276 verbose = 0;
277 #if !defined(DDB)
278 printf("VERBOSE_SYSINIT: DDB not enabled, symbol lookups disabled.\n");
279 #endif
280 #endif
281
282 /*
283 * Perform each system initialization task from the ordered list. Note
284 * that if sysinit_list is modified (e.g. by a KLD) we will nonetheless
285 * always perform the earlist-sorted sysinit at each step; using the
286 * STAILQ_FOREACH macro would result in items being skipped if inserted
287 * earlier than the "current item".
288 */
289 while ((sip = STAILQ_FIRST(&sysinit_list)) != NULL) {
290 STAILQ_REMOVE_HEAD(&sysinit_list, next);
291 STAILQ_INSERT_TAIL(&sysinit_done_list, sip, next);
292
293 if (sip->subsystem == SI_SUB_DUMMY)
294 continue; /* skip dummy task(s)*/
295
296 if (sip->subsystem > last)
297 BOOTTRACE_INIT("sysinit 0x%7x", sip->subsystem);
298
299 #if defined(VERBOSE_SYSINIT)
300 if (sip->subsystem > last && verbose_sysinit != 0) {
301 verbose = 1;
302 printf("subsystem %x\n", last);
303 }
304 if (verbose) {
305 #if defined(DDB)
306 const char *func, *data;
307
308 func = symbol_name((vm_offset_t)sip->func,
309 DB_STGY_PROC);
310 data = symbol_name((vm_offset_t)sip->udata,
311 DB_STGY_ANY);
312 if (func != NULL && data != NULL)
313 printf(" %s(&%s)... ", func, data);
314 else if (func != NULL)
315 printf(" %s(%p)... ", func, sip->udata);
316 else
317 #endif
318 printf(" %p(%p)... ", sip->func,
319 sip->udata);
320 }
321 #endif
322
323 /* Call function */
324 (*(sip->func))(sip->udata);
325
326 #if defined(VERBOSE_SYSINIT)
327 if (verbose)
328 printf("done.\n");
329 #endif
330
331 /* Check off the one we're just done */
332 last = sip->subsystem;
333 }
334
335 TSEXIT(); /* Here so we don't overlap with start_init. */
336 BOOTTRACE("mi_startup done");
337
338 mtx_assert(&Giant, MA_OWNED | MA_NOTRECURSED);
339 mtx_unlock(&Giant);
340
341 /*
342 * Now hand over this thread to swapper.
343 */
344 swapper();
345 /* NOTREACHED*/
346 }
347
348 static void
print_caddr_t(void * data)349 print_caddr_t(void *data)
350 {
351 printf("%s", (char *)data);
352 }
353
354 static void
print_version(void * data __unused)355 print_version(void *data __unused)
356 {
357 int len;
358
359 /* Strip a trailing newline from version. */
360 len = strlen(version);
361 while (len > 0 && version[len - 1] == '\n')
362 len--;
363 printf("%.*s %s\n", len, version, machine);
364 printf("%s\n", compiler_version);
365 }
366
367 SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t,
368 copyright);
369 SYSINIT(trademark, SI_SUB_COPYRIGHT, SI_ORDER_SECOND, print_caddr_t,
370 trademark);
371 SYSINIT(version, SI_SUB_COPYRIGHT, SI_ORDER_THIRD, print_version, NULL);
372
373 #ifdef WITNESS
374 static char wit_warn[] =
375 "WARNING: WITNESS option enabled, expect reduced performance.\n";
376 SYSINIT(witwarn, SI_SUB_COPYRIGHT, SI_ORDER_FOURTH,
377 print_caddr_t, wit_warn);
378 SYSINIT(witwarn2, SI_SUB_LAST, SI_ORDER_FOURTH,
379 print_caddr_t, wit_warn);
380 #endif
381
382 #ifdef DIAGNOSTIC
383 static char diag_warn[] =
384 "WARNING: DIAGNOSTIC option enabled, expect reduced performance.\n";
385 SYSINIT(diagwarn, SI_SUB_COPYRIGHT, SI_ORDER_FIFTH,
386 print_caddr_t, diag_warn);
387 SYSINIT(diagwarn2, SI_SUB_LAST, SI_ORDER_FIFTH,
388 print_caddr_t, diag_warn);
389 #endif
390
391 #if __SIZEOF_LONG__ == 4
392 static char ilp32_warn[] =
393 "WARNING: 32-bit kernels are deprecated and may be removed in FreeBSD 15.0.\n";
394 SYSINIT(ilp32warn, SI_SUB_COPYRIGHT, SI_ORDER_FIFTH,
395 print_caddr_t, ilp32_warn);
396 SYSINIT(ilp32warn2, SI_SUB_LAST, SI_ORDER_FIFTH,
397 print_caddr_t, ilp32_warn);
398 #endif
399
400 static int
null_fetch_syscall_args(struct thread * td __unused)401 null_fetch_syscall_args(struct thread *td __unused)
402 {
403
404 panic("null_fetch_syscall_args");
405 }
406
407 static void
null_set_syscall_retval(struct thread * td __unused,int error __unused)408 null_set_syscall_retval(struct thread *td __unused, int error __unused)
409 {
410
411 panic("null_set_syscall_retval");
412 }
413
414 static void
null_set_fork_retval(struct thread * td __unused)415 null_set_fork_retval(struct thread *td __unused)
416 {
417
418 }
419
420 struct sysentvec null_sysvec = {
421 .sv_size = 0,
422 .sv_table = NULL,
423 .sv_fixup = NULL,
424 .sv_sendsig = NULL,
425 .sv_sigcode = NULL,
426 .sv_szsigcode = NULL,
427 .sv_name = "null",
428 .sv_coredump = NULL,
429 .sv_minsigstksz = 0,
430 .sv_minuser = VM_MIN_ADDRESS,
431 .sv_maxuser = VM_MAXUSER_ADDRESS,
432 .sv_usrstack = USRSTACK,
433 .sv_psstrings = PS_STRINGS,
434 .sv_psstringssz = sizeof(struct ps_strings),
435 .sv_stackprot = VM_PROT_ALL,
436 .sv_copyout_strings = NULL,
437 .sv_setregs = NULL,
438 .sv_fixlimit = NULL,
439 .sv_maxssiz = NULL,
440 .sv_flags = 0,
441 .sv_set_syscall_retval = null_set_syscall_retval,
442 .sv_fetch_syscall_args = null_fetch_syscall_args,
443 .sv_syscallnames = NULL,
444 .sv_schedtail = NULL,
445 .sv_thread_detach = NULL,
446 .sv_trap = NULL,
447 .sv_set_fork_retval = null_set_fork_retval,
448 .sv_regset_begin = NULL,
449 .sv_regset_end = NULL,
450 };
451
452 /*
453 * The two following SYSINIT's are proc0 specific glue code. I am not
454 * convinced that they can not be safely combined, but their order of
455 * operation has been maintained as the same as the original init_main.c
456 * for right now.
457 */
458 /* ARGSUSED*/
459 static void
proc0_init(void * dummy __unused)460 proc0_init(void *dummy __unused)
461 {
462 struct proc *p;
463 struct thread *td;
464 struct ucred *newcred;
465 struct uidinfo tmpuinfo;
466 struct loginclass tmplc = {
467 .lc_name = "",
468 };
469 vm_paddr_t pageablemem;
470 int i;
471
472 GIANT_REQUIRED;
473 p = &proc0;
474 td = &thread0;
475
476 /*
477 * Initialize magic number and osrel.
478 */
479 p->p_magic = P_MAGIC;
480 p->p_osrel = osreldate;
481
482 /*
483 * Initialize thread and process structures.
484 */
485 procinit(); /* set up proc zone */
486 threadinit(); /* set up UMA zones */
487
488 /*
489 * Initialise scheduler resources.
490 * Add scheduler specific parts to proc, thread as needed.
491 */
492 schedinit(); /* scheduler gets its house in order */
493
494 /*
495 * Create process 0 (the swapper).
496 */
497 LIST_INSERT_HEAD(&allproc, p, p_list);
498 LIST_INSERT_HEAD(PIDHASH(0), p, p_hash);
499 mtx_init(&pgrp0.pg_mtx, "process group", NULL, MTX_DEF | MTX_DUPOK);
500 sx_init(&pgrp0.pg_killsx, "killpg racer");
501 p->p_pgrp = &pgrp0;
502 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash);
503 LIST_INIT(&pgrp0.pg_members);
504 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist);
505
506 pgrp0.pg_session = &session0;
507 mtx_init(&session0.s_mtx, "session", NULL, MTX_DEF);
508 refcount_init(&session0.s_count, 1);
509 session0.s_leader = p;
510
511 p->p_sysent = &null_sysvec;
512 p->p_flag = P_SYSTEM | P_INMEM | P_KPROC;
513 p->p_flag2 = 0;
514 p->p_state = PRS_NORMAL;
515 p->p_klist = knlist_alloc(&p->p_mtx);
516 STAILQ_INIT(&p->p_ktr);
517 p->p_nice = NZERO;
518 td->td_tid = THREAD0_TID;
519 tidhash_add(td);
520 TD_SET_STATE(td, TDS_RUNNING);
521 td->td_pri_class = PRI_TIMESHARE;
522 td->td_user_pri = PUSER;
523 td->td_base_user_pri = PUSER;
524 td->td_lend_user_pri = PRI_MAX;
525 td->td_priority = PVM;
526 td->td_base_pri = PVM;
527 td->td_oncpu = curcpu;
528 td->td_flags = TDF_INMEM;
529 td->td_pflags = TDP_KTHREAD;
530 td->td_cpuset = cpuset_thread0();
531 td->td_domain.dr_policy = td->td_cpuset->cs_domain;
532 prison0_init();
533 p->p_peers = 0;
534 p->p_leader = p;
535 p->p_reaper = p;
536 p->p_treeflag |= P_TREE_REAPER;
537 LIST_INIT(&p->p_reaplist);
538
539 strncpy(p->p_comm, "kernel", sizeof (p->p_comm));
540 strncpy(td->td_name, "swapper", sizeof (td->td_name));
541
542 callout_init_mtx(&p->p_itcallout, &p->p_mtx, 0);
543 callout_init_mtx(&p->p_limco, &p->p_mtx, 0);
544 callout_init(&td->td_slpcallout, 1);
545 TAILQ_INIT(&p->p_kqtim_stop);
546
547 /* Create credentials. */
548 newcred = crget();
549 newcred->cr_ngroups = 1; /* group 0 */
550 /* A hack to prevent uifind from tripping over NULL pointers. */
551 curthread->td_ucred = newcred;
552 tmpuinfo.ui_uid = 1;
553 newcred->cr_uidinfo = newcred->cr_ruidinfo = &tmpuinfo;
554 newcred->cr_uidinfo = uifind(0);
555 newcred->cr_ruidinfo = uifind(0);
556 newcred->cr_loginclass = &tmplc;
557 newcred->cr_loginclass = loginclass_find("default");
558 /* End hack. creds get properly set later with thread_cow_get_proc */
559 curthread->td_ucred = NULL;
560 newcred->cr_prison = &prison0;
561 newcred->cr_users++; /* avoid assertion failure */
562 p->p_ucred = crcowget(newcred);
563 newcred->cr_users--;
564 crfree(newcred);
565 #ifdef AUDIT
566 audit_cred_kproc0(newcred);
567 #endif
568 #ifdef MAC
569 mac_cred_create_swapper(newcred);
570 #endif
571 /* Create sigacts. */
572 p->p_sigacts = sigacts_alloc();
573
574 /* Initialize signal state for process 0. */
575 siginit(&proc0);
576
577 /* Create the file descriptor table. */
578 p->p_pd = pdinit(NULL, false);
579 p->p_fd = fdinit();
580 p->p_fdtol = NULL;
581
582 /* Create the limits structures. */
583 p->p_limit = lim_alloc();
584 for (i = 0; i < RLIM_NLIMITS; i++)
585 p->p_limit->pl_rlimit[i].rlim_cur =
586 p->p_limit->pl_rlimit[i].rlim_max = RLIM_INFINITY;
587 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_cur =
588 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles;
589 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_cur =
590 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc;
591 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_cur = dfldsiz;
592 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_max = maxdsiz;
593 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_cur = dflssiz;
594 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_max = maxssiz;
595 /* Cast to avoid overflow on i386/PAE. */
596 pageablemem = ptoa((vm_paddr_t)vm_free_count());
597 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_cur =
598 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_max = pageablemem;
599 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = pageablemem / 3;
600 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_max = pageablemem;
601 p->p_cpulimit = RLIM_INFINITY;
602
603 PROC_LOCK(p);
604 thread_cow_get_proc(td, p);
605 PROC_UNLOCK(p);
606
607 /* Initialize resource accounting structures. */
608 racct_create(&p->p_racct);
609
610 p->p_stats = pstats_alloc();
611
612 /* Allocate a prototype map so we have something to fork. */
613 p->p_vmspace = &vmspace0;
614 refcount_init(&vmspace0.vm_refcnt, 1);
615 pmap_pinit0(vmspace_pmap(&vmspace0));
616
617 /*
618 * proc0 is not expected to enter usermode, so there is no special
619 * handling for sv_minuser here, like is done for exec_new_vmspace().
620 */
621 vm_map_init(&vmspace0.vm_map, vmspace_pmap(&vmspace0),
622 p->p_sysent->sv_minuser, p->p_sysent->sv_maxuser);
623
624 /*
625 * Call the init and ctor for the new thread and proc. We wait
626 * to do this until all other structures are fairly sane.
627 */
628 EVENTHANDLER_DIRECT_INVOKE(process_init, p);
629 EVENTHANDLER_DIRECT_INVOKE(thread_init, td);
630 #ifdef KDTRACE_HOOKS
631 kdtrace_proc_ctor(p);
632 kdtrace_thread_ctor(td);
633 #endif
634 EVENTHANDLER_DIRECT_INVOKE(process_ctor, p);
635 EVENTHANDLER_DIRECT_INVOKE(thread_ctor, td);
636
637 /*
638 * Charge root for one process.
639 */
640 (void)chgproccnt(p->p_ucred->cr_ruidinfo, 1, 0);
641 PROC_LOCK(p);
642 racct_add_force(p, RACCT_NPROC, 1);
643 PROC_UNLOCK(p);
644 }
645 SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL);
646
647 /* ARGSUSED*/
648 static void
proc0_post(void * dummy __unused)649 proc0_post(void *dummy __unused)
650 {
651 struct proc *p;
652 struct rusage ru;
653 struct thread *td;
654
655 /*
656 * Now we can look at the time, having had a chance to verify the
657 * time from the filesystem. Pretend that proc0 started now.
658 */
659 sx_slock(&allproc_lock);
660 FOREACH_PROC_IN_SYSTEM(p) {
661 PROC_LOCK(p);
662 if (p->p_state == PRS_NEW) {
663 PROC_UNLOCK(p);
664 continue;
665 }
666 microuptime(&p->p_stats->p_start);
667 PROC_STATLOCK(p);
668 rufetch(p, &ru); /* Clears thread stats */
669 p->p_rux.rux_runtime = 0;
670 p->p_rux.rux_uticks = 0;
671 p->p_rux.rux_sticks = 0;
672 p->p_rux.rux_iticks = 0;
673 PROC_STATUNLOCK(p);
674 FOREACH_THREAD_IN_PROC(p, td) {
675 td->td_runtime = 0;
676 }
677 PROC_UNLOCK(p);
678 }
679 sx_sunlock(&allproc_lock);
680 PCPU_SET(switchtime, cpu_ticks());
681 PCPU_SET(switchticks, ticks);
682 }
683 SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL);
684
685 /*
686 ***************************************************************************
687 ****
688 **** The following SYSINIT's and glue code should be moved to the
689 **** respective files on a per subsystem basis.
690 ****
691 ***************************************************************************
692 */
693
694 /*
695 * List of paths to try when searching for "init".
696 */
697 static char init_path[MAXPATHLEN] =
698 #ifdef INIT_PATH
699 __XSTRING(INIT_PATH);
700 #else
701 "/sbin/init:/sbin/oinit:/sbin/init.bak:/rescue/init";
702 #endif
703 SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0,
704 "Path used to search the init process");
705
706 /*
707 * Shutdown timeout of init(8).
708 * Unused within kernel, but used to control init(8), hence do not remove.
709 */
710 #ifndef INIT_SHUTDOWN_TIMEOUT
711 #define INIT_SHUTDOWN_TIMEOUT 120
712 #endif
713 static int init_shutdown_timeout = INIT_SHUTDOWN_TIMEOUT;
714 SYSCTL_INT(_kern, OID_AUTO, init_shutdown_timeout,
715 CTLFLAG_RW, &init_shutdown_timeout, 0, "Shutdown timeout of init(8). "
716 "Unused within kernel, but used to control init(8)");
717
718 /*
719 * Start the initial user process; try exec'ing each pathname in init_path.
720 * The program is invoked with one argument containing the boot flags.
721 */
722 static void
start_init(void * dummy)723 start_init(void *dummy)
724 {
725 struct image_args args;
726 int error;
727 char *var, *path;
728 char *free_init_path, *tmp_init_path;
729 struct thread *td;
730 struct proc *p;
731 struct vmspace *oldvmspace;
732
733 TSENTER(); /* Here so we don't overlap with mi_startup. */
734
735 td = curthread;
736 p = td->td_proc;
737
738 vfs_mountroot();
739
740 /* Wipe GELI passphrase from the environment. */
741 kern_unsetenv("kern.geom.eli.passphrase");
742
743 /* For Multicons, report which console is primary to both */
744 if (boothowto & RB_MULTIPLE) {
745 if (boothowto & RB_SERIAL)
746 printf("Dual Console: Serial Primary, Video Secondary\n");
747 else
748 printf("Dual Console: Video Primary, Serial Secondary\n");
749 }
750
751 if ((var = kern_getenv("init_path")) != NULL) {
752 strlcpy(init_path, var, sizeof(init_path));
753 freeenv(var);
754 }
755 free_init_path = tmp_init_path = strdup(init_path, M_TEMP);
756
757 while ((path = strsep(&tmp_init_path, ":")) != NULL) {
758 if (bootverbose)
759 printf("start_init: trying %s\n", path);
760
761 memset(&args, 0, sizeof(args));
762 error = exec_alloc_args(&args);
763 if (error != 0)
764 panic("%s: Can't allocate space for init arguments %d",
765 __func__, error);
766
767 error = exec_args_add_fname(&args, path, UIO_SYSSPACE);
768 if (error != 0)
769 panic("%s: Can't add fname %d", __func__, error);
770 error = exec_args_add_arg(&args, path, UIO_SYSSPACE);
771 if (error != 0)
772 panic("%s: Can't add argv[0] %d", __func__, error);
773 if (boothowto & RB_SINGLE)
774 error = exec_args_add_arg(&args, "-s", UIO_SYSSPACE);
775 if (error != 0)
776 panic("%s: Can't add argv[0] %d", __func__, error);
777
778 /*
779 * Now try to exec the program. If can't for any reason
780 * other than it doesn't exist, complain.
781 *
782 * Otherwise, return via fork_trampoline() all the way
783 * to user mode as init!
784 */
785 KASSERT((td->td_pflags & TDP_EXECVMSPC) == 0,
786 ("nested execve"));
787 memset(td->td_frame, 0, sizeof(*td->td_frame));
788 oldvmspace = p->p_vmspace;
789 error = kern_execve(td, &args, NULL, oldvmspace);
790 KASSERT(error != 0,
791 ("kern_execve returned success, not EJUSTRETURN"));
792 if (error == EJUSTRETURN) {
793 exec_cleanup(td, oldvmspace);
794 free(free_init_path, M_TEMP);
795 TSEXIT();
796 return;
797 }
798 if (error != ENOENT)
799 printf("exec %s: error %d\n", path, error);
800 }
801 free(free_init_path, M_TEMP);
802 printf("init: not found in path %s\n", init_path);
803 panic("no init");
804 }
805
806 /*
807 * Like kproc_create(), but runs in its own address space. We do this
808 * early to reserve pid 1. Note special case - do not make it
809 * runnable yet, init execution is started when userspace can be served.
810 */
811 static void
create_init(const void * udata __unused)812 create_init(const void *udata __unused)
813 {
814 struct fork_req fr;
815 struct ucred *newcred, *oldcred;
816 struct thread *td;
817 int error;
818
819 bzero(&fr, sizeof(fr));
820 fr.fr_flags = RFFDG | RFPROC | RFSTOPPED;
821 fr.fr_procp = &initproc;
822 error = fork1(&thread0, &fr);
823 if (error)
824 panic("cannot fork init: %d\n", error);
825 KASSERT(initproc->p_pid == 1, ("create_init: initproc->p_pid != 1"));
826 /* divorce init's credentials from the kernel's */
827 newcred = crget();
828 sx_xlock(&proctree_lock);
829 PROC_LOCK(initproc);
830 initproc->p_flag |= P_SYSTEM | P_INMEM;
831 initproc->p_treeflag |= P_TREE_REAPER;
832 oldcred = initproc->p_ucred;
833 crcopy(newcred, oldcred);
834 #ifdef MAC
835 mac_cred_create_init(newcred);
836 #endif
837 #ifdef AUDIT
838 audit_cred_proc1(newcred);
839 #endif
840 proc_set_cred(initproc, newcred);
841 td = FIRST_THREAD_IN_PROC(initproc);
842 crcowfree(td);
843 td->td_realucred = crcowget(initproc->p_ucred);
844 td->td_ucred = td->td_realucred;
845 PROC_UNLOCK(initproc);
846 sx_xunlock(&proctree_lock);
847 crfree(oldcred);
848 cpu_fork_kthread_handler(FIRST_THREAD_IN_PROC(initproc),
849 start_init, NULL);
850 }
851 SYSINIT(init, SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL);
852
853 /*
854 * Make it runnable now.
855 */
856 static void
kick_init(const void * udata __unused)857 kick_init(const void *udata __unused)
858 {
859 struct thread *td;
860
861 td = FIRST_THREAD_IN_PROC(initproc);
862 thread_lock(td);
863 TD_SET_CAN_RUN(td);
864 sched_add(td, SRQ_BORING);
865 }
866 SYSINIT(kickinit, SI_SUB_KTHREAD_INIT, SI_ORDER_MIDDLE, kick_init, NULL);
867
868 /*
869 * DDB(4).
870 */
871 #ifdef DDB
872 static void
db_show_print_syinit(struct sysinit * sip,bool ddb)873 db_show_print_syinit(struct sysinit *sip, bool ddb)
874 {
875 const char *sname, *funcname;
876 c_db_sym_t sym;
877 db_expr_t offset;
878
879 #define xprint(...) \
880 if (ddb) \
881 db_printf(__VA_ARGS__); \
882 else \
883 printf(__VA_ARGS__)
884
885 if (sip == NULL) {
886 xprint("%s: no sysinit * given\n", __func__);
887 return;
888 }
889
890 sym = db_search_symbol((vm_offset_t)sip, DB_STGY_ANY, &offset);
891 db_symbol_values(sym, &sname, NULL);
892 sym = db_search_symbol((vm_offset_t)sip->func, DB_STGY_PROC, &offset);
893 db_symbol_values(sym, &funcname, NULL);
894 xprint("%s(%p)\n", (sname != NULL) ? sname : "", sip);
895 xprint(" %#08x %#08x\n", sip->subsystem, sip->order);
896 xprint(" %p(%s)(%p)\n",
897 sip->func, (funcname != NULL) ? funcname : "", sip->udata);
898 #undef xprint
899 }
900
DB_SHOW_COMMAND_FLAGS(sysinit,db_show_sysinit,DB_CMD_MEMSAFE)901 DB_SHOW_COMMAND_FLAGS(sysinit, db_show_sysinit, DB_CMD_MEMSAFE)
902 {
903 struct sysinit *sip;
904
905 db_printf("SYSINIT vs Name(Ptr)\n");
906 db_printf(" Subsystem Order\n");
907 db_printf(" Function(Name)(Arg)\n");
908 STAILQ_FOREACH(sip, &sysinit_done_list, next) {
909 db_show_print_syinit(sip, true);
910 if (db_pager_quit)
911 return;
912 }
913 STAILQ_FOREACH(sip, &sysinit_list, next) {
914 db_show_print_syinit(sip, true);
915 if (db_pager_quit)
916 break;
917 }
918 }
919 #endif /* DDB */
920