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 * @(#)init_main.c 8.9 (Berkeley) 1/21/94
44 */
45
46 #include <sys/cdefs.h>
47 #include "opt_ddb.h"
48 #include "opt_kdb.h"
49 #include "opt_init_path.h"
50 #include "opt_verbose_sysinit.h"
51
52 #include <sys/param.h>
53 #include <sys/systm.h>
54 #include <sys/conf.h>
55 #include <sys/cpuset.h>
56 #include <sys/dtrace_bsd.h>
57 #include <sys/epoch.h>
58 #include <sys/eventhandler.h>
59 #include <sys/exec.h>
60 #include <sys/file.h>
61 #include <sys/filedesc.h>
62 #include <sys/imgact.h>
63 #include <sys/jail.h>
64 #include <sys/kernel.h>
65 #include <sys/ktr.h>
66 #include <sys/lock.h>
67 #include <sys/loginclass.h>
68 #include <sys/malloc.h>
69 #include <sys/mount.h>
70 #include <sys/mutex.h>
71 #include <sys/proc.h>
72 #include <sys/racct.h>
73 #include <sys/reboot.h>
74 #include <sys/resourcevar.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 #endif
142
143 #ifdef INVARIANTS
144 FEATURE(invariants, "Kernel compiled with INVARIANTS, may affect performance");
145 #endif
146
147 /*
148 * This ensures that there is at least one entry so that the sysinit_set
149 * symbol is not undefined. A sybsystem ID of SI_SUB_DUMMY is never
150 * executed.
151 */
152 SYSINIT(placeholder, SI_SUB_DUMMY, SI_ORDER_ANY, NULL, NULL);
153
154 /*
155 * The sysinit table itself. Items are checked off as the are run.
156 * If we want to register new sysinit types, add them to newsysinit.
157 */
158 SET_DECLARE(sysinit_set, struct sysinit);
159 struct sysinit **sysinit, **sysinit_end;
160 struct sysinit **newsysinit, **newsysinit_end;
161
162 /*
163 * Merge a new sysinit set into the current set, reallocating it if
164 * necessary. This can only be called after malloc is running.
165 */
166 void
sysinit_add(struct sysinit ** set,struct sysinit ** set_end)167 sysinit_add(struct sysinit **set, struct sysinit **set_end)
168 {
169 struct sysinit **newset;
170 struct sysinit **sipp;
171 struct sysinit **xipp;
172 int count;
173
174 count = set_end - set;
175 if (newsysinit)
176 count += newsysinit_end - newsysinit;
177 else
178 count += sysinit_end - sysinit;
179 newset = malloc(count * sizeof(*sipp), M_TEMP, M_NOWAIT);
180 if (newset == NULL)
181 panic("cannot malloc for sysinit");
182 xipp = newset;
183 if (newsysinit)
184 for (sipp = newsysinit; sipp < newsysinit_end; sipp++)
185 *xipp++ = *sipp;
186 else
187 for (sipp = sysinit; sipp < sysinit_end; sipp++)
188 *xipp++ = *sipp;
189 for (sipp = set; sipp < set_end; sipp++)
190 *xipp++ = *sipp;
191 if (newsysinit)
192 free(newsysinit, M_TEMP);
193 newsysinit = newset;
194 newsysinit_end = newset + count;
195 }
196
197 #if defined (DDB) && defined(VERBOSE_SYSINIT)
198 static const char *
symbol_name(vm_offset_t va,db_strategy_t strategy)199 symbol_name(vm_offset_t va, db_strategy_t strategy)
200 {
201 const char *name;
202 c_db_sym_t sym;
203 db_expr_t offset;
204
205 if (va == 0)
206 return (NULL);
207 sym = db_search_symbol(va, strategy, &offset);
208 if (offset != 0)
209 return (NULL);
210 db_symbol_values(sym, &name, NULL);
211 return (name);
212 }
213 #endif
214
215 /*
216 * System startup; initialize the world, create process 0, mount root
217 * filesystem, and fork to create init and pagedaemon. Most of the
218 * hard work is done in the lower-level initialization routines including
219 * startup(), which does memory initialization and autoconfiguration.
220 *
221 * This allows simple addition of new kernel subsystems that require
222 * boot time initialization. It also allows substitution of subsystem
223 * (for instance, a scheduler, kernel profiler, or VM system) by object
224 * module. Finally, it allows for optional "kernel threads".
225 */
226 void
mi_startup(void)227 mi_startup(void)
228 {
229
230 struct sysinit **sipp; /* system initialization*/
231 struct sysinit **xipp; /* interior loop of sort*/
232 struct sysinit *save; /* bubble*/
233
234 #if defined(VERBOSE_SYSINIT)
235 int last;
236 int verbose;
237 #endif
238
239 TSENTER();
240
241 if (boothowto & RB_VERBOSE)
242 bootverbose++;
243
244 if (sysinit == NULL) {
245 sysinit = SET_BEGIN(sysinit_set);
246 sysinit_end = SET_LIMIT(sysinit_set);
247 }
248
249 restart:
250 /*
251 * Perform a bubble sort of the system initialization objects by
252 * their subsystem (primary key) and order (secondary key).
253 */
254 for (sipp = sysinit; sipp < sysinit_end; sipp++) {
255 for (xipp = sipp + 1; xipp < sysinit_end; xipp++) {
256 if ((*sipp)->subsystem < (*xipp)->subsystem ||
257 ((*sipp)->subsystem == (*xipp)->subsystem &&
258 (*sipp)->order <= (*xipp)->order))
259 continue; /* skip*/
260 save = *sipp;
261 *sipp = *xipp;
262 *xipp = save;
263 }
264 }
265
266 #if defined(VERBOSE_SYSINIT)
267 last = SI_SUB_DUMMY;
268 TUNABLE_INT_FETCH("debug.verbose_sysinit", &verbose_sysinit);
269 verbose = 0;
270 #if !defined(DDB)
271 printf("VERBOSE_SYSINIT: DDB not enabled, symbol lookups disabled.\n");
272 #endif
273 #endif
274
275 /*
276 * Traverse the (now) ordered list of system initialization tasks.
277 * Perform each task, and continue on to the next task.
278 */
279 for (sipp = sysinit; sipp < sysinit_end; sipp++) {
280 if ((*sipp)->subsystem == SI_SUB_DUMMY)
281 continue; /* skip dummy task(s)*/
282
283 if ((*sipp)->subsystem == SI_SUB_DONE)
284 continue;
285
286 #if defined(VERBOSE_SYSINIT)
287 if ((*sipp)->subsystem > last && verbose_sysinit != 0) {
288 verbose = 1;
289 last = (*sipp)->subsystem;
290 printf("subsystem %x\n", last);
291 }
292 if (verbose) {
293 #if defined(DDB)
294 const char *func, *data;
295
296 func = symbol_name((vm_offset_t)(*sipp)->func,
297 DB_STGY_PROC);
298 data = symbol_name((vm_offset_t)(*sipp)->udata,
299 DB_STGY_ANY);
300 if (func != NULL && data != NULL)
301 printf(" %s(&%s)... ", func, data);
302 else if (func != NULL)
303 printf(" %s(%p)... ", func, (*sipp)->udata);
304 else
305 #endif
306 printf(" %p(%p)... ", (*sipp)->func,
307 (*sipp)->udata);
308 }
309 #endif
310
311 /* Call function */
312 (*((*sipp)->func))((*sipp)->udata);
313
314 #if defined(VERBOSE_SYSINIT)
315 if (verbose)
316 printf("done.\n");
317 #endif
318
319 /* Check off the one we're just done */
320 (*sipp)->subsystem = SI_SUB_DONE;
321
322 /* Check if we've installed more sysinit items via KLD */
323 if (newsysinit != NULL) {
324 if (sysinit != SET_BEGIN(sysinit_set))
325 free(sysinit, M_TEMP);
326 sysinit = newsysinit;
327 sysinit_end = newsysinit_end;
328 newsysinit = NULL;
329 newsysinit_end = NULL;
330 goto restart;
331 }
332 }
333
334 TSEXIT(); /* Here so we don't overlap with start_init. */
335
336 mtx_assert(&Giant, MA_OWNED | MA_NOTRECURSED);
337 mtx_unlock(&Giant);
338
339 /*
340 * Now hand over this thread to swapper.
341 */
342 swapper();
343 /* NOTREACHED*/
344 }
345
346 static void
print_caddr_t(const void * data)347 print_caddr_t(const void *data)
348 {
349 printf("%s", (const char *)data);
350 }
351
352 static void
print_version(const void * data __unused)353 print_version(const void *data __unused)
354 {
355 int len;
356
357 /* Strip a trailing newline from version. */
358 len = strlen(version);
359 while (len > 0 && version[len - 1] == '\n')
360 len--;
361 printf("%.*s %s\n", len, version, machine);
362 printf("%s\n", compiler_version);
363 }
364
365 C_SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t,
366 copyright);
367 C_SYSINIT(trademark, SI_SUB_COPYRIGHT, SI_ORDER_SECOND, print_caddr_t,
368 trademark);
369 C_SYSINIT(version, SI_SUB_COPYRIGHT, SI_ORDER_THIRD, print_version, NULL);
370
371 #ifdef WITNESS
372 static const char wit_warn[] =
373 "WARNING: WITNESS option enabled, expect reduced performance.\n";
374 C_SYSINIT(witwarn, SI_SUB_COPYRIGHT, SI_ORDER_FOURTH,
375 print_caddr_t, wit_warn);
376 C_SYSINIT(witwarn2, SI_SUB_LAST, SI_ORDER_FOURTH,
377 print_caddr_t, wit_warn);
378 #endif
379
380 #ifdef DIAGNOSTIC
381 static const char diag_warn[] =
382 "WARNING: DIAGNOSTIC option enabled, expect reduced performance.\n";
383 C_SYSINIT(diagwarn, SI_SUB_COPYRIGHT, SI_ORDER_FIFTH,
384 print_caddr_t, diag_warn);
385 C_SYSINIT(diagwarn2, SI_SUB_LAST, SI_ORDER_FIFTH,
386 print_caddr_t, diag_warn);
387 #endif
388
389 #if __SIZEOF_LONG__ == 4
390 static const char ilp32_warn[] =
391 "WARNING: 32-bit kernels are deprecated and may be removed in FreeBSD 15.0.\n";
392 C_SYSINIT(ilp32warn, SI_SUB_COPYRIGHT, SI_ORDER_FIFTH,
393 print_caddr_t, ilp32_warn);
394 C_SYSINIT(ilp32warn2, SI_SUB_LAST, SI_ORDER_FIFTH,
395 print_caddr_t, ilp32_warn);
396 #endif
397
398 static int
null_fetch_syscall_args(struct thread * td __unused)399 null_fetch_syscall_args(struct thread *td __unused)
400 {
401
402 panic("null_fetch_syscall_args");
403 }
404
405 static void
null_set_syscall_retval(struct thread * td __unused,int error __unused)406 null_set_syscall_retval(struct thread *td __unused, int error __unused)
407 {
408
409 panic("null_set_syscall_retval");
410 }
411
412 static void
null_set_fork_retval(struct thread * td __unused)413 null_set_fork_retval(struct thread *td __unused)
414 {
415
416 }
417
418 struct sysentvec null_sysvec = {
419 .sv_size = 0,
420 .sv_table = NULL,
421 .sv_fixup = NULL,
422 .sv_sendsig = NULL,
423 .sv_sigcode = NULL,
424 .sv_szsigcode = NULL,
425 .sv_name = "null",
426 .sv_coredump = NULL,
427 .sv_imgact_try = NULL,
428 .sv_minsigstksz = 0,
429 .sv_minuser = VM_MIN_ADDRESS,
430 .sv_maxuser = VM_MAXUSER_ADDRESS,
431 .sv_usrstack = USRSTACK,
432 .sv_psstrings = PS_STRINGS,
433 .sv_psstringssz = sizeof(struct ps_strings),
434 .sv_stackprot = VM_PROT_ALL,
435 .sv_copyout_strings = NULL,
436 .sv_setregs = NULL,
437 .sv_fixlimit = NULL,
438 .sv_maxssiz = NULL,
439 .sv_flags = 0,
440 .sv_set_syscall_retval = null_set_syscall_retval,
441 .sv_fetch_syscall_args = null_fetch_syscall_args,
442 .sv_syscallnames = NULL,
443 .sv_schedtail = NULL,
444 .sv_thread_detach = NULL,
445 .sv_trap = NULL,
446 .sv_regset_begin = NULL,
447 .sv_regset_end = NULL,
448 .sv_set_fork_retval = null_set_fork_retval,
449 };
450
451 /*
452 * The two following SYSINIT's are proc0 specific glue code. I am not
453 * convinced that they can not be safely combined, but their order of
454 * operation has been maintained as the same as the original init_main.c
455 * for right now.
456 */
457 /* ARGSUSED*/
458 static void
proc0_init(void * dummy __unused)459 proc0_init(void *dummy __unused)
460 {
461 struct proc *p;
462 struct thread *td;
463 struct ucred *newcred;
464 struct uidinfo tmpuinfo;
465 struct loginclass tmplc = {
466 .lc_name = "",
467 };
468 vm_paddr_t pageablemem;
469 int i;
470
471 GIANT_REQUIRED;
472 p = &proc0;
473 td = &thread0;
474
475 /*
476 * Initialize magic number and osrel.
477 */
478 p->p_magic = P_MAGIC;
479 p->p_osrel = osreldate;
480
481 /*
482 * Initialize thread and process structures.
483 */
484 procinit(); /* set up proc zone */
485 threadinit(); /* set up UMA zones */
486
487 /*
488 * Initialise scheduler resources.
489 * Add scheduler specific parts to proc, thread as needed.
490 */
491 schedinit(); /* scheduler gets its house in order */
492
493 /*
494 * Create process 0 (the swapper).
495 */
496 LIST_INSERT_HEAD(&allproc, p, p_list);
497 LIST_INSERT_HEAD(PIDHASH(0), p, p_hash);
498 mtx_init(&pgrp0.pg_mtx, "process group", NULL, MTX_DEF | MTX_DUPOK);
499 sx_init(&pgrp0.pg_killsx, "killpg racer");
500 p->p_pgrp = &pgrp0;
501 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash);
502 LIST_INIT(&pgrp0.pg_members);
503 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist);
504
505 pgrp0.pg_session = &session0;
506 mtx_init(&session0.s_mtx, "session", NULL, MTX_DEF);
507 refcount_init(&session0.s_count, 1);
508 session0.s_leader = p;
509
510 p->p_sysent = &null_sysvec;
511 p->p_flag = P_SYSTEM | P_INMEM | P_KPROC;
512 p->p_flag2 = 0;
513 p->p_state = PRS_NORMAL;
514 p->p_klist = knlist_alloc(&p->p_mtx);
515 STAILQ_INIT(&p->p_ktr);
516 p->p_nice = NZERO;
517 td->td_tid = THREAD0_TID;
518 tidhash_add(td);
519 td->td_state = TDS_RUNNING;
520 td->td_pri_class = PRI_TIMESHARE;
521 td->td_user_pri = PUSER;
522 td->td_base_user_pri = PUSER;
523 td->td_lend_user_pri = PRI_MAX;
524 td->td_priority = PVM;
525 td->td_base_pri = PVM;
526 td->td_oncpu = curcpu;
527 td->td_flags = TDF_INMEM;
528 td->td_pflags = TDP_KTHREAD;
529 td->td_cpuset = cpuset_thread0();
530 td->td_domain.dr_policy = td->td_cpuset->cs_domain;
531 prison0_init();
532 p->p_peers = 0;
533 p->p_leader = p;
534 p->p_reaper = p;
535 p->p_treeflag |= P_TREE_REAPER;
536 LIST_INIT(&p->p_reaplist);
537
538 strncpy(p->p_comm, "kernel", sizeof (p->p_comm));
539 strncpy(td->td_name, "swapper", sizeof (td->td_name));
540
541 callout_init_mtx(&p->p_itcallout, &p->p_mtx, 0);
542 callout_init_mtx(&p->p_limco, &p->p_mtx, 0);
543 callout_init(&td->td_slpcallout, 1);
544 TAILQ_INIT(&p->p_kqtim_stop);
545
546 /* Create credentials. */
547 newcred = crget();
548 newcred->cr_ngroups = 1; /* group 0 */
549 /* A hack to prevent uifind from tripping over NULL pointers. */
550 curthread->td_ucred = newcred;
551 tmpuinfo.ui_uid = 1;
552 newcred->cr_uidinfo = newcred->cr_ruidinfo = &tmpuinfo;
553 newcred->cr_uidinfo = uifind(0);
554 newcred->cr_ruidinfo = uifind(0);
555 newcred->cr_loginclass = &tmplc;
556 newcred->cr_loginclass = loginclass_find("default");
557 /* End hack. creds get properly set later with thread_cow_get_proc */
558 curthread->td_ucred = NULL;
559 newcred->cr_prison = &prison0;
560 newcred->cr_users++; /* avoid assertion failure */
561 p->p_ucred = crcowget(newcred);
562 newcred->cr_users--;
563 crfree(newcred);
564 #ifdef AUDIT
565 audit_cred_kproc0(newcred);
566 #endif
567 #ifdef MAC
568 mac_cred_create_swapper(newcred);
569 #endif
570 /* Create sigacts. */
571 p->p_sigacts = sigacts_alloc();
572
573 /* Initialize signal state for process 0. */
574 siginit(&proc0);
575
576 /* Create the file descriptor table. */
577 p->p_pd = pdinit(NULL, false);
578 p->p_fd = fdinit(NULL, false, NULL);
579 p->p_fdtol = NULL;
580
581 /* Create the limits structures. */
582 p->p_limit = lim_alloc();
583 for (i = 0; i < RLIM_NLIMITS; i++)
584 p->p_limit->pl_rlimit[i].rlim_cur =
585 p->p_limit->pl_rlimit[i].rlim_max = RLIM_INFINITY;
586 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_cur =
587 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles;
588 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_cur =
589 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc;
590 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_cur = dfldsiz;
591 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_max = maxdsiz;
592 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_cur = dflssiz;
593 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_max = maxssiz;
594 /* Cast to avoid overflow on i386/PAE. */
595 pageablemem = ptoa((vm_paddr_t)vm_free_count());
596 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_cur =
597 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_max = pageablemem;
598 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = pageablemem / 3;
599 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_max = pageablemem;
600 p->p_cpulimit = RLIM_INFINITY;
601
602 PROC_LOCK(p);
603 thread_cow_get_proc(td, p);
604 PROC_UNLOCK(p);
605
606 /* Initialize resource accounting structures. */
607 racct_create(&p->p_racct);
608
609 p->p_stats = pstats_alloc();
610
611 /* Allocate a prototype map so we have something to fork. */
612 p->p_vmspace = &vmspace0;
613 refcount_init(&vmspace0.vm_refcnt, 1);
614 pmap_pinit0(vmspace_pmap(&vmspace0));
615
616 /*
617 * proc0 is not expected to enter usermode, so there is no special
618 * handling for sv_minuser here, like is done for exec_new_vmspace().
619 */
620 vm_map_init(&vmspace0.vm_map, vmspace_pmap(&vmspace0),
621 p->p_sysent->sv_minuser, p->p_sysent->sv_maxuser);
622
623 /*
624 * Call the init and ctor for the new thread and proc. We wait
625 * to do this until all other structures are fairly sane.
626 */
627 EVENTHANDLER_DIRECT_INVOKE(process_init, p);
628 EVENTHANDLER_DIRECT_INVOKE(thread_init, td);
629 #ifdef KDTRACE_HOOKS
630 kdtrace_proc_ctor(p);
631 kdtrace_thread_ctor(td);
632 #endif
633 EVENTHANDLER_DIRECT_INVOKE(process_ctor, p);
634 EVENTHANDLER_DIRECT_INVOKE(thread_ctor, td);
635
636 /*
637 * Charge root for one process.
638 */
639 (void)chgproccnt(p->p_ucred->cr_ruidinfo, 1, 0);
640 PROC_LOCK(p);
641 racct_add_force(p, RACCT_NPROC, 1);
642 PROC_UNLOCK(p);
643 }
644 SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL);
645
646 /* ARGSUSED*/
647 static void
proc0_post(void * dummy __unused)648 proc0_post(void *dummy __unused)
649 {
650 struct proc *p;
651 struct rusage ru;
652 struct thread *td;
653
654 /*
655 * Now we can look at the time, having had a chance to verify the
656 * time from the filesystem. Pretend that proc0 started now.
657 */
658 sx_slock(&allproc_lock);
659 FOREACH_PROC_IN_SYSTEM(p) {
660 PROC_LOCK(p);
661 if (p->p_state == PRS_NEW) {
662 PROC_UNLOCK(p);
663 continue;
664 }
665 microuptime(&p->p_stats->p_start);
666 PROC_STATLOCK(p);
667 rufetch(p, &ru); /* Clears thread stats */
668 p->p_rux.rux_runtime = 0;
669 p->p_rux.rux_uticks = 0;
670 p->p_rux.rux_sticks = 0;
671 p->p_rux.rux_iticks = 0;
672 PROC_STATUNLOCK(p);
673 FOREACH_THREAD_IN_PROC(p, td) {
674 td->td_runtime = 0;
675 }
676 PROC_UNLOCK(p);
677 }
678 sx_sunlock(&allproc_lock);
679 PCPU_SET(switchtime, cpu_ticks());
680 PCPU_SET(switchticks, ticks);
681 }
682 SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL);
683
684 /*
685 ***************************************************************************
686 ****
687 **** The following SYSINIT's and glue code should be moved to the
688 **** respective files on a per subsystem basis.
689 ****
690 ***************************************************************************
691 */
692
693 /*
694 * List of paths to try when searching for "init".
695 */
696 static char init_path[MAXPATHLEN] =
697 #ifdef INIT_PATH
698 __XSTRING(INIT_PATH);
699 #else
700 "/sbin/init:/sbin/oinit:/sbin/init.bak:/rescue/init";
701 #endif
702 SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0,
703 "Path used to search the init process");
704
705 /*
706 * Shutdown timeout of init(8).
707 * Unused within kernel, but used to control init(8), hence do not remove.
708 */
709 #ifndef INIT_SHUTDOWN_TIMEOUT
710 #define INIT_SHUTDOWN_TIMEOUT 120
711 #endif
712 static int init_shutdown_timeout = INIT_SHUTDOWN_TIMEOUT;
713 SYSCTL_INT(_kern, OID_AUTO, init_shutdown_timeout,
714 CTLFLAG_RW, &init_shutdown_timeout, 0, "Shutdown timeout of init(8). "
715 "Unused within kernel, but used to control init(8)");
716
717 /*
718 * Start the initial user process; try exec'ing each pathname in init_path.
719 * The program is invoked with one argument containing the boot flags.
720 */
721 static void
start_init(void * dummy)722 start_init(void *dummy)
723 {
724 struct image_args args;
725 int error;
726 char *var, *path;
727 char *free_init_path, *tmp_init_path;
728 struct thread *td;
729 struct proc *p;
730 struct vmspace *oldvmspace;
731
732 TSENTER(); /* Here so we don't overlap with mi_startup. */
733
734 td = curthread;
735 p = td->td_proc;
736
737 vfs_mountroot();
738
739 /* Wipe GELI passphrase from the environment. */
740 kern_unsetenv("kern.geom.eli.passphrase");
741
742 /* For Multicons, report which console is primary to both */
743 if (boothowto & RB_MULTIPLE) {
744 if (boothowto & RB_SERIAL)
745 printf("Dual Console: Serial Primary, Video Secondary\n");
746 else
747 printf("Dual Console: Video Primary, Serial Secondary\n");
748 }
749
750 if ((var = kern_getenv("init_path")) != NULL) {
751 strlcpy(init_path, var, sizeof(init_path));
752 freeenv(var);
753 }
754 free_init_path = tmp_init_path = strdup(init_path, M_TEMP);
755
756 while ((path = strsep(&tmp_init_path, ":")) != NULL) {
757 if (bootverbose)
758 printf("start_init: trying %s\n", path);
759
760 memset(&args, 0, sizeof(args));
761 error = exec_alloc_args(&args);
762 if (error != 0)
763 panic("%s: Can't allocate space for init arguments %d",
764 __func__, error);
765
766 error = exec_args_add_fname(&args, path, UIO_SYSSPACE);
767 if (error != 0)
768 panic("%s: Can't add fname %d", __func__, error);
769 error = exec_args_add_arg(&args, path, UIO_SYSSPACE);
770 if (error != 0)
771 panic("%s: Can't add argv[0] %d", __func__, error);
772 if (boothowto & RB_SINGLE)
773 error = exec_args_add_arg(&args, "-s", UIO_SYSSPACE);
774 if (error != 0)
775 panic("%s: Can't add argv[0] %d", __func__, error);
776
777 /*
778 * Now try to exec the program. If can't for any reason
779 * other than it doesn't exist, complain.
780 *
781 * Otherwise, return via fork_trampoline() all the way
782 * to user mode as init!
783 */
784 KASSERT((td->td_pflags & TDP_EXECVMSPC) == 0,
785 ("nested execve"));
786 memset(td->td_frame, 0, sizeof(*td->td_frame));
787 oldvmspace = p->p_vmspace;
788 error = kern_execve(td, &args, NULL, oldvmspace);
789 KASSERT(error != 0,
790 ("kern_execve returned success, not EJUSTRETURN"));
791 if (error == EJUSTRETURN) {
792 exec_cleanup(td, oldvmspace);
793 free(free_init_path, M_TEMP);
794 TSEXIT();
795 return;
796 }
797 if (error != ENOENT)
798 printf("exec %s: error %d\n", path, error);
799 }
800 free(free_init_path, M_TEMP);
801 printf("init: not found in path %s\n", init_path);
802 panic("no init");
803 }
804
805 /*
806 * Like kproc_create(), but runs in its own address space. We do this
807 * early to reserve pid 1. Note special case - do not make it
808 * runnable yet, init execution is started when userspace can be served.
809 */
810 static void
create_init(const void * udata __unused)811 create_init(const void *udata __unused)
812 {
813 struct fork_req fr;
814 struct ucred *newcred, *oldcred;
815 struct thread *td;
816 int error;
817
818 bzero(&fr, sizeof(fr));
819 fr.fr_flags = RFFDG | RFPROC | RFSTOPPED;
820 fr.fr_procp = &initproc;
821 error = fork1(&thread0, &fr);
822 if (error)
823 panic("cannot fork init: %d\n", error);
824 KASSERT(initproc->p_pid == 1, ("create_init: initproc->p_pid != 1"));
825 /* divorce init's credentials from the kernel's */
826 newcred = crget();
827 sx_xlock(&proctree_lock);
828 PROC_LOCK(initproc);
829 initproc->p_flag |= P_SYSTEM | P_INMEM;
830 initproc->p_treeflag |= P_TREE_REAPER;
831 oldcred = initproc->p_ucred;
832 crcopy(newcred, oldcred);
833 #ifdef MAC
834 mac_cred_create_init(newcred);
835 #endif
836 #ifdef AUDIT
837 audit_cred_proc1(newcred);
838 #endif
839 proc_set_cred(initproc, newcred);
840 td = FIRST_THREAD_IN_PROC(initproc);
841 crcowfree(td);
842 td->td_realucred = crcowget(initproc->p_ucred);
843 td->td_ucred = td->td_realucred;
844 PROC_UNLOCK(initproc);
845 sx_xunlock(&proctree_lock);
846 crfree(oldcred);
847 cpu_fork_kthread_handler(FIRST_THREAD_IN_PROC(initproc),
848 start_init, NULL);
849 }
850 SYSINIT(init, SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL);
851
852 /*
853 * Make it runnable now.
854 */
855 static void
kick_init(const void * udata __unused)856 kick_init(const void *udata __unused)
857 {
858 struct thread *td;
859
860 td = FIRST_THREAD_IN_PROC(initproc);
861 thread_lock(td);
862 TD_SET_CAN_RUN(td);
863 sched_add(td, SRQ_BORING);
864 }
865 SYSINIT(kickinit, SI_SUB_KTHREAD_INIT, SI_ORDER_MIDDLE, kick_init, NULL);
866
867 /*
868 * DDB(4).
869 */
870 #ifdef DDB
871 static void
db_show_print_syinit(struct sysinit * sip,bool ddb)872 db_show_print_syinit(struct sysinit *sip, bool ddb)
873 {
874 const char *sname, *funcname;
875 c_db_sym_t sym;
876 db_expr_t offset;
877
878 #define xprint(...) \
879 if (ddb) \
880 db_printf(__VA_ARGS__); \
881 else \
882 printf(__VA_ARGS__)
883
884 if (sip == NULL) {
885 xprint("%s: no sysinit * given\n", __func__);
886 return;
887 }
888
889 sym = db_search_symbol((vm_offset_t)sip, DB_STGY_ANY, &offset);
890 db_symbol_values(sym, &sname, NULL);
891 sym = db_search_symbol((vm_offset_t)sip->func, DB_STGY_PROC, &offset);
892 db_symbol_values(sym, &funcname, NULL);
893 xprint("%s(%p)\n", (sname != NULL) ? sname : "", sip);
894 xprint(" %#08x %#08x\n", sip->subsystem, sip->order);
895 xprint(" %p(%s)(%p)\n",
896 sip->func, (funcname != NULL) ? funcname : "", sip->udata);
897 #undef xprint
898 }
899
DB_SHOW_COMMAND(sysinit,db_show_sysinit)900 DB_SHOW_COMMAND(sysinit, db_show_sysinit)
901 {
902 struct sysinit **sipp;
903
904 db_printf("SYSINIT vs Name(Ptr)\n");
905 db_printf(" Subsystem Order\n");
906 db_printf(" Function(Name)(Arg)\n");
907 for (sipp = sysinit; sipp < sysinit_end; sipp++) {
908 db_show_print_syinit(*sipp, true);
909 if (db_pager_quit)
910 break;
911 }
912 }
913 #endif /* DDB */
914