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/boottrace.h>
55 #include <sys/conf.h>
56 #include <sys/cpuset.h>
57 #include <sys/dtrace_bsd.h>
58 #include <sys/epoch.h>
59 #include <sys/eventhandler.h>
60 #include <sys/exec.h>
61 #include <sys/file.h>
62 #include <sys/filedesc.h>
63 #include <sys/imgact.h>
64 #include <sys/jail.h>
65 #include <sys/kernel.h>
66 #include <sys/ktr.h>
67 #include <sys/lock.h>
68 #include <sys/loginclass.h>
69 #include <sys/malloc.h>
70 #include <sys/mount.h>
71 #include <sys/mutex.h>
72 #include <sys/proc.h>
73 #include <sys/racct.h>
74 #include <sys/reboot.h>
75 #include <sys/resourcevar.h>
76 #include <sys/queue.h>
77 #include <sys/queue_mergesort.h>
78 #include <sys/sched.h>
79 #include <sys/signalvar.h>
80 #include <sys/sx.h>
81 #include <sys/syscallsubr.h>
82 #include <sys/sysctl.h>
83 #include <sys/sysent.h>
84 #include <sys/sysproto.h>
85 #include <sys/unistd.h>
86 #include <sys/vmmeter.h>
87 #include <sys/vnode.h>
88
89 #include <machine/cpu.h>
90
91 #include <security/audit/audit.h>
92 #include <security/mac/mac_framework.h>
93
94 #include <vm/vm.h>
95 #include <vm/vm_param.h>
96 #include <vm/vm_extern.h>
97 #include <vm/pmap.h>
98 #include <vm/vm_map.h>
99 #include <sys/copyright.h>
100
101 #include <ddb/ddb.h>
102 #include <ddb/db_sym.h>
103
104 void mi_startup(void); /* Should be elsewhere */
105
106 /* Components of the first process -- never freed. */
107 static struct session session0;
108 static struct pgrp pgrp0;
109 struct proc proc0;
110 struct thread0_storage thread0_st __aligned(32);
111 struct vmspace vmspace0;
112 struct proc *initproc;
113
114 int
linux_alloc_current_noop(struct thread * td __unused,int flags __unused)115 linux_alloc_current_noop(struct thread *td __unused, int flags __unused)
116 {
117 return (0);
118 }
119 int (*lkpi_alloc_current)(struct thread *, int) = linux_alloc_current_noop;
120
121 #ifndef BOOTHOWTO
122 #define BOOTHOWTO 0
123 #endif
124 int boothowto = BOOTHOWTO; /* initialized so that it can be patched */
125 SYSCTL_INT(_debug, OID_AUTO, boothowto, CTLFLAG_RD, &boothowto, 0,
126 "Boot control flags, passed from loader");
127
128 #ifndef BOOTVERBOSE
129 #define BOOTVERBOSE 0
130 #endif
131 int bootverbose = BOOTVERBOSE;
132 SYSCTL_INT(_debug, OID_AUTO, bootverbose, CTLFLAG_RW, &bootverbose, 0,
133 "Control the output of verbose kernel messages");
134
135 #ifdef VERBOSE_SYSINIT
136 /*
137 * We'll use the defined value of VERBOSE_SYSINIT from the kernel config to
138 * dictate the default VERBOSE_SYSINIT behavior. Significant values for this
139 * option and associated tunable are:
140 * - 0, 'compiled in but silent by default'
141 * - 1, 'compiled in but verbose by default' (default)
142 */
143 int verbose_sysinit = VERBOSE_SYSINIT;
144 TUNABLE_INT("debug.verbose_sysinit", &verbose_sysinit);
145 #endif
146
147 #ifdef INVARIANTS
148 FEATURE(invariants, "Kernel compiled with INVARIANTS, may affect performance");
149 #endif
150
151 /*
152 * This ensures that there is at least one entry so that the sysinit_set
153 * symbol is not undefined. A sybsystem ID of SI_SUB_DUMMY is never
154 * executed.
155 */
156 SYSINIT(placeholder, SI_SUB_DUMMY, SI_ORDER_ANY, NULL, NULL);
157
158 /*
159 * The sysinit linker set compiled into the kernel. These are placed onto the
160 * sysinit list by mi_startup; sysinit_add can add (e.g., from klds) additional
161 * sysinits to the linked list but the linker set here does not change.
162 */
163 SET_DECLARE(sysinit_set, struct sysinit);
164
165 /*
166 * The sysinit lists. Items are moved to sysinit_done_list when done.
167 */
168 static STAILQ_HEAD(sysinitlist, sysinit) sysinit_list;
169 static struct sysinitlist sysinit_done_list =
170 STAILQ_HEAD_INITIALIZER(sysinit_done_list);
171
172 /*
173 * Compare two sysinits; return -1, 0, or 1 if a comes before, at the same time
174 * as, or after b.
175 */
176 static int
sysinit_compar(struct sysinit * a,struct sysinit * b,void * thunk __unused)177 sysinit_compar(struct sysinit *a, struct sysinit *b, void *thunk __unused)
178 {
179
180 if (a->subsystem < b->subsystem)
181 return (-1);
182 if (a->subsystem > b->subsystem)
183 return (1);
184 if (a->order < b->order)
185 return (-1);
186 if (a->order > b->order)
187 return (1);
188 return (0);
189 }
190
191 static void
sysinit_mklist(struct sysinitlist * list,struct sysinit ** set,struct sysinit ** set_end)192 sysinit_mklist(struct sysinitlist *list, struct sysinit **set,
193 struct sysinit **set_end)
194 {
195 struct sysinit **sipp;
196
197 TSENTER();
198 TSENTER2("listify");
199 STAILQ_INIT(list);
200 for (sipp = set; sipp < set_end; sipp++)
201 STAILQ_INSERT_TAIL(list, *sipp, next);
202 TSEXIT2("listify");
203 TSENTER2("mergesort");
204 STAILQ_MERGESORT(list, NULL, sysinit_compar, sysinit, next);
205 TSEXIT2("mergesort");
206 TSEXIT();
207 }
208
209 /*
210 * Merge a new sysinit set into the sysinit list.
211 */
212 void
sysinit_add(struct sysinit ** set,struct sysinit ** set_end)213 sysinit_add(struct sysinit **set, struct sysinit **set_end)
214 {
215 struct sysinitlist new_list;
216
217 TSENTER();
218
219 /* Construct a sorted list from the new sysinits. */
220 sysinit_mklist(&new_list, set, set_end);
221
222 /* Merge the new list into the existing one. */
223 TSENTER2("STAILQ_MERGE");
224 STAILQ_MERGE(&sysinit_list, &new_list, NULL, sysinit_compar, sysinit, next);
225 TSEXIT2("STAILQ_MERGE");
226
227 TSEXIT();
228 }
229
230 #if defined (DDB) && defined(VERBOSE_SYSINIT)
231 static const char *
symbol_name(vm_offset_t va,db_strategy_t strategy)232 symbol_name(vm_offset_t va, db_strategy_t strategy)
233 {
234 const char *name;
235 c_db_sym_t sym;
236 db_expr_t offset;
237
238 if (va == 0)
239 return (NULL);
240 sym = db_search_symbol(va, strategy, &offset);
241 if (offset != 0)
242 return (NULL);
243 db_symbol_values(sym, &name, NULL);
244 return (name);
245 }
246 #endif
247
248 /*
249 * System startup; initialize the world, create process 0, mount root
250 * filesystem, and fork to create init and pagedaemon. Most of the
251 * hard work is done in the lower-level initialization routines including
252 * startup(), which does memory initialization and autoconfiguration.
253 *
254 * This allows simple addition of new kernel subsystems that require
255 * boot time initialization. It also allows substitution of subsystem
256 * (for instance, a scheduler, kernel profiler, or VM system) by object
257 * module. Finally, it allows for optional "kernel threads".
258 */
259 void
mi_startup(void)260 mi_startup(void)
261 {
262
263 struct sysinit *sip;
264 int last;
265 #if defined(VERBOSE_SYSINIT)
266 int verbose;
267 #endif
268
269 TSENTER();
270
271 if (boothowto & RB_VERBOSE)
272 bootverbose++;
273
274 /* Construct and sort sysinit list. */
275 sysinit_mklist(&sysinit_list, SET_BEGIN(sysinit_set), SET_LIMIT(sysinit_set));
276
277 last = SI_SUB_COPYRIGHT;
278 #if defined(VERBOSE_SYSINIT)
279 verbose = 0;
280 #if !defined(DDB)
281 printf("VERBOSE_SYSINIT: DDB not enabled, symbol lookups disabled.\n");
282 #endif
283 #endif
284
285 /*
286 * Perform each system initialization task from the ordered list. Note
287 * that if sysinit_list is modified (e.g. by a KLD) we will nonetheless
288 * always perform the earlist-sorted sysinit at each step; using the
289 * STAILQ_FOREACH macro would result in items being skipped if inserted
290 * earlier than the "current item".
291 */
292 while ((sip = STAILQ_FIRST(&sysinit_list)) != NULL) {
293 STAILQ_REMOVE_HEAD(&sysinit_list, next);
294 STAILQ_INSERT_TAIL(&sysinit_done_list, sip, next);
295
296 if (sip->subsystem == SI_SUB_DUMMY)
297 continue; /* skip dummy task(s)*/
298
299 if (sip->subsystem > last)
300 BOOTTRACE_INIT("sysinit 0x%7x", sip->subsystem);
301
302 #if defined(VERBOSE_SYSINIT)
303 if (sip->subsystem > last && verbose_sysinit != 0) {
304 verbose = 1;
305 printf("subsystem %x\n", last);
306 }
307 if (verbose) {
308 #if defined(DDB)
309 const char *func, *data;
310
311 func = symbol_name((vm_offset_t)sip->func,
312 DB_STGY_PROC);
313 data = symbol_name((vm_offset_t)sip->udata,
314 DB_STGY_ANY);
315 if (func != NULL && data != NULL)
316 printf(" %s(&%s)... ", func, data);
317 else if (func != NULL)
318 printf(" %s(%p)... ", func, sip->udata);
319 else
320 #endif
321 printf(" %p(%p)... ", sip->func,
322 sip->udata);
323 }
324 #endif
325
326 /* Call function */
327 (*(sip->func))(sip->udata);
328
329 #if defined(VERBOSE_SYSINIT)
330 if (verbose)
331 printf("done.\n");
332 #endif
333
334 /* Check off the one we're just done */
335 last = sip->subsystem;
336 }
337
338 TSEXIT(); /* Here so we don't overlap with start_init. */
339 BOOTTRACE("mi_startup done");
340
341 mtx_assert(&Giant, MA_OWNED | MA_NOTRECURSED);
342 mtx_unlock(&Giant);
343
344 /*
345 * Now hand over this thread to swapper.
346 */
347 swapper();
348 /* NOTREACHED*/
349 }
350
351 static void
print_caddr_t(const void * data)352 print_caddr_t(const void *data)
353 {
354 printf("%s", (const char *)data);
355 }
356
357 static void
print_version(const void * data __unused)358 print_version(const void *data __unused)
359 {
360 int len;
361
362 /* Strip a trailing newline from version. */
363 len = strlen(version);
364 while (len > 0 && version[len - 1] == '\n')
365 len--;
366 printf("%.*s %s\n", len, version, machine);
367 printf("%s\n", compiler_version);
368 }
369
370 C_SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t,
371 copyright);
372 C_SYSINIT(trademark, SI_SUB_COPYRIGHT, SI_ORDER_SECOND, print_caddr_t,
373 trademark);
374 C_SYSINIT(version, SI_SUB_COPYRIGHT, SI_ORDER_THIRD, print_version, NULL);
375
376 #ifdef WITNESS
377 static const char wit_warn[] =
378 "WARNING: WITNESS option enabled, expect reduced performance.\n";
379 C_SYSINIT(witwarn, SI_SUB_COPYRIGHT, SI_ORDER_FOURTH,
380 print_caddr_t, wit_warn);
381 C_SYSINIT(witwarn2, SI_SUB_LAST, SI_ORDER_FOURTH,
382 print_caddr_t, wit_warn);
383 #endif
384
385 #ifdef DIAGNOSTIC
386 static const char diag_warn[] =
387 "WARNING: DIAGNOSTIC option enabled, expect reduced performance.\n";
388 C_SYSINIT(diagwarn, SI_SUB_COPYRIGHT, SI_ORDER_FIFTH,
389 print_caddr_t, diag_warn);
390 C_SYSINIT(diagwarn2, SI_SUB_LAST, SI_ORDER_FIFTH,
391 print_caddr_t, diag_warn);
392 #endif
393
394 #if __SIZEOF_LONG__ == 4
395 static const char ilp32_warn[] =
396 "WARNING: 32-bit kernels are deprecated and may be removed in FreeBSD 15.0.\n";
397 C_SYSINIT(ilp32warn, SI_SUB_COPYRIGHT, SI_ORDER_FIFTH,
398 print_caddr_t, ilp32_warn);
399 C_SYSINIT(ilp32warn2, SI_SUB_LAST, SI_ORDER_FIFTH,
400 print_caddr_t, ilp32_warn);
401 #endif
402
403 static int
null_fetch_syscall_args(struct thread * td __unused)404 null_fetch_syscall_args(struct thread *td __unused)
405 {
406
407 panic("null_fetch_syscall_args");
408 }
409
410 static void
null_set_syscall_retval(struct thread * td __unused,int error __unused)411 null_set_syscall_retval(struct thread *td __unused, int error __unused)
412 {
413
414 panic("null_set_syscall_retval");
415 }
416
417 static void
null_set_fork_retval(struct thread * td __unused)418 null_set_fork_retval(struct thread *td __unused)
419 {
420
421 }
422
423 struct sysentvec null_sysvec = {
424 .sv_size = 0,
425 .sv_table = NULL,
426 .sv_fixup = NULL,
427 .sv_sendsig = NULL,
428 .sv_sigcode = NULL,
429 .sv_szsigcode = NULL,
430 .sv_name = "null",
431 .sv_coredump = NULL,
432 .sv_minsigstksz = 0,
433 .sv_minuser = VM_MIN_ADDRESS,
434 .sv_maxuser = VM_MAXUSER_ADDRESS,
435 .sv_usrstack = USRSTACK,
436 .sv_psstrings = PS_STRINGS,
437 .sv_psstringssz = sizeof(struct ps_strings),
438 .sv_stackprot = VM_PROT_ALL,
439 .sv_copyout_strings = NULL,
440 .sv_setregs = NULL,
441 .sv_fixlimit = NULL,
442 .sv_maxssiz = NULL,
443 .sv_flags = 0,
444 .sv_set_syscall_retval = null_set_syscall_retval,
445 .sv_fetch_syscall_args = null_fetch_syscall_args,
446 .sv_syscallnames = NULL,
447 .sv_schedtail = NULL,
448 .sv_thread_detach = NULL,
449 .sv_trap = NULL,
450 .sv_set_fork_retval = null_set_fork_retval,
451 .sv_regset_begin = NULL,
452 .sv_regset_end = NULL,
453 };
454
455 /*
456 * The two following SYSINIT's are proc0 specific glue code. I am not
457 * convinced that they can not be safely combined, but their order of
458 * operation has been maintained as the same as the original init_main.c
459 * for right now.
460 */
461 /* ARGSUSED*/
462 static void
proc0_init(void * dummy __unused)463 proc0_init(void *dummy __unused)
464 {
465 struct proc *p;
466 struct thread *td;
467 struct ucred *newcred;
468 struct uidinfo tmpuinfo;
469 struct loginclass tmplc = {
470 .lc_name = "",
471 };
472 vm_paddr_t pageablemem;
473 int i;
474
475 GIANT_REQUIRED;
476 p = &proc0;
477 td = &thread0;
478
479 /*
480 * Initialize magic number and osrel.
481 */
482 p->p_magic = P_MAGIC;
483 p->p_osrel = osreldate;
484
485 /*
486 * Initialize thread and process structures.
487 */
488 procinit(); /* set up proc zone */
489 threadinit(); /* set up UMA zones */
490
491 /*
492 * Initialise scheduler resources.
493 * Add scheduler specific parts to proc, thread as needed.
494 */
495 schedinit(); /* scheduler gets its house in order */
496
497 /*
498 * Create process 0 (the swapper).
499 */
500 LIST_INSERT_HEAD(&allproc, p, p_list);
501 LIST_INSERT_HEAD(PIDHASH(0), p, p_hash);
502 mtx_init(&pgrp0.pg_mtx, "process group", NULL, MTX_DEF | MTX_DUPOK);
503 sx_init(&pgrp0.pg_killsx, "killpg racer");
504 p->p_pgrp = &pgrp0;
505 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash);
506 LIST_INIT(&pgrp0.pg_members);
507 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist);
508
509 pgrp0.pg_session = &session0;
510 mtx_init(&session0.s_mtx, "session", NULL, MTX_DEF);
511 refcount_init(&session0.s_count, 1);
512 session0.s_leader = p;
513
514 p->p_sysent = &null_sysvec;
515 p->p_flag = P_SYSTEM | P_INMEM | P_KPROC;
516 p->p_flag2 = 0;
517 p->p_state = PRS_NORMAL;
518 p->p_klist = knlist_alloc(&p->p_mtx);
519 STAILQ_INIT(&p->p_ktr);
520 p->p_nice = NZERO;
521 td->td_tid = THREAD0_TID;
522 tidhash_add(td);
523 TD_SET_STATE(td, TDS_RUNNING);
524 td->td_pri_class = PRI_TIMESHARE;
525 td->td_user_pri = PUSER;
526 td->td_base_user_pri = PUSER;
527 td->td_lend_user_pri = PRI_MAX;
528 td->td_priority = PVM;
529 td->td_base_pri = PVM;
530 td->td_oncpu = curcpu;
531 td->td_flags = TDF_INMEM;
532 td->td_pflags = TDP_KTHREAD;
533 td->td_cpuset = cpuset_thread0();
534 td->td_domain.dr_policy = td->td_cpuset->cs_domain;
535 prison0_init();
536 p->p_peers = 0;
537 p->p_leader = p;
538 p->p_reaper = p;
539 p->p_treeflag |= P_TREE_REAPER;
540 LIST_INIT(&p->p_reaplist);
541
542 strncpy(p->p_comm, "kernel", sizeof (p->p_comm));
543 strncpy(td->td_name, "swapper", sizeof (td->td_name));
544
545 callout_init_mtx(&p->p_itcallout, &p->p_mtx, 0);
546 callout_init_mtx(&p->p_limco, &p->p_mtx, 0);
547 callout_init(&td->td_slpcallout, 1);
548 TAILQ_INIT(&p->p_kqtim_stop);
549
550 /* Create credentials. */
551 newcred = crget();
552 newcred->cr_ngroups = 1; /* group 0 */
553 /* A hack to prevent uifind from tripping over NULL pointers. */
554 curthread->td_ucred = newcred;
555 tmpuinfo.ui_uid = 1;
556 newcred->cr_uidinfo = newcred->cr_ruidinfo = &tmpuinfo;
557 newcred->cr_uidinfo = uifind(0);
558 newcred->cr_ruidinfo = uifind(0);
559 newcred->cr_loginclass = &tmplc;
560 newcred->cr_loginclass = loginclass_find("default");
561 /* End hack. creds get properly set later with thread_cow_get_proc */
562 curthread->td_ucred = NULL;
563 newcred->cr_prison = &prison0;
564 newcred->cr_users++; /* avoid assertion failure */
565 proc_set_cred_init(p, newcred);
566 newcred->cr_users--;
567 crfree(newcred);
568 #ifdef AUDIT
569 audit_cred_kproc0(newcred);
570 #endif
571 #ifdef MAC
572 mac_cred_create_swapper(newcred);
573 #endif
574 /* Create sigacts. */
575 p->p_sigacts = sigacts_alloc();
576
577 /* Initialize signal state for process 0. */
578 siginit(&proc0);
579
580 /* Create the file descriptor table. */
581 p->p_pd = pdinit(NULL, false);
582 p->p_fd = fdinit();
583 p->p_fdtol = NULL;
584
585 /* Create the limits structures. */
586 p->p_limit = lim_alloc();
587 for (i = 0; i < RLIM_NLIMITS; i++)
588 p->p_limit->pl_rlimit[i].rlim_cur =
589 p->p_limit->pl_rlimit[i].rlim_max = RLIM_INFINITY;
590 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_cur =
591 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles;
592 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_cur =
593 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc;
594 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_cur = dfldsiz;
595 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_max = maxdsiz;
596 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_cur = dflssiz;
597 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_max = maxssiz;
598 /* Cast to avoid overflow on i386/PAE. */
599 pageablemem = ptoa((vm_paddr_t)vm_free_count());
600 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_cur =
601 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_max = pageablemem;
602 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = pageablemem / 3;
603 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_max = pageablemem;
604 p->p_cpulimit = RLIM_INFINITY;
605
606 PROC_LOCK(p);
607 thread_cow_get_proc(td, p);
608 PROC_UNLOCK(p);
609
610 /* Initialize resource accounting structures. */
611 racct_create(&p->p_racct);
612
613 p->p_stats = pstats_alloc();
614
615 /* Allocate a prototype map so we have something to fork. */
616 p->p_vmspace = &vmspace0;
617 refcount_init(&vmspace0.vm_refcnt, 1);
618 pmap_pinit0(vmspace_pmap(&vmspace0));
619
620 /*
621 * proc0 is not expected to enter usermode, so there is no special
622 * handling for sv_minuser here, like is done for exec_new_vmspace().
623 */
624 vm_map_init(&vmspace0.vm_map, vmspace_pmap(&vmspace0),
625 p->p_sysent->sv_minuser, p->p_sysent->sv_maxuser);
626
627 /*
628 * Call the init and ctor for the new thread and proc. We wait
629 * to do this until all other structures are fairly sane.
630 */
631 EVENTHANDLER_DIRECT_INVOKE(process_init, p);
632 EVENTHANDLER_DIRECT_INVOKE(thread_init, td);
633 #ifdef KDTRACE_HOOKS
634 kdtrace_proc_ctor(p);
635 kdtrace_thread_ctor(td);
636 #endif
637 EVENTHANDLER_DIRECT_INVOKE(process_ctor, p);
638 EVENTHANDLER_DIRECT_INVOKE(thread_ctor, td);
639
640 /*
641 * Charge root for one process.
642 */
643 (void)chgproccnt(p->p_ucred->cr_ruidinfo, 1, 0);
644 PROC_LOCK(p);
645 racct_add_force(p, RACCT_NPROC, 1);
646 PROC_UNLOCK(p);
647 }
648 SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL);
649
650 /* ARGSUSED*/
651 static void
proc0_post(void * dummy __unused)652 proc0_post(void *dummy __unused)
653 {
654 struct proc *p;
655 struct rusage ru;
656 struct thread *td;
657
658 /*
659 * Now we can look at the time, having had a chance to verify the
660 * time from the filesystem. Pretend that proc0 started now.
661 */
662 sx_slock(&allproc_lock);
663 FOREACH_PROC_IN_SYSTEM(p) {
664 PROC_LOCK(p);
665 if (p->p_state == PRS_NEW) {
666 PROC_UNLOCK(p);
667 continue;
668 }
669 microuptime(&p->p_stats->p_start);
670 PROC_STATLOCK(p);
671 rufetch(p, &ru); /* Clears thread stats */
672 p->p_rux.rux_runtime = 0;
673 p->p_rux.rux_uticks = 0;
674 p->p_rux.rux_sticks = 0;
675 p->p_rux.rux_iticks = 0;
676 PROC_STATUNLOCK(p);
677 FOREACH_THREAD_IN_PROC(p, td) {
678 td->td_runtime = 0;
679 }
680 PROC_UNLOCK(p);
681 }
682 sx_sunlock(&allproc_lock);
683 PCPU_SET(switchtime, cpu_ticks());
684 PCPU_SET(switchticks, ticks);
685 }
686 SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL);
687
688 /*
689 ***************************************************************************
690 ****
691 **** The following SYSINIT's and glue code should be moved to the
692 **** respective files on a per subsystem basis.
693 ****
694 ***************************************************************************
695 */
696
697 /*
698 * List of paths to try when searching for "init".
699 */
700 static char init_path[MAXPATHLEN] =
701 #ifdef INIT_PATH
702 __XSTRING(INIT_PATH);
703 #else
704 "/sbin/init:/sbin/oinit:/sbin/init.bak:/rescue/init";
705 #endif
706 SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0,
707 "Path used to search the init process");
708
709 /*
710 * Shutdown timeout of init(8).
711 * Unused within kernel, but used to control init(8), hence do not remove.
712 */
713 #ifndef INIT_SHUTDOWN_TIMEOUT
714 #define INIT_SHUTDOWN_TIMEOUT 120
715 #endif
716 static int init_shutdown_timeout = INIT_SHUTDOWN_TIMEOUT;
717 SYSCTL_INT(_kern, OID_AUTO, init_shutdown_timeout,
718 CTLFLAG_RW, &init_shutdown_timeout, 0, "Shutdown timeout of init(8). "
719 "Unused within kernel, but used to control init(8)");
720
721 /*
722 * Start the initial user process; try exec'ing each pathname in init_path.
723 * The program is invoked with one argument containing the boot flags.
724 */
725 static void
start_init(void * dummy)726 start_init(void *dummy)
727 {
728 struct image_args args;
729 int error;
730 char *var, *path;
731 char *free_init_path, *tmp_init_path;
732 struct thread *td;
733 struct proc *p;
734 struct vmspace *oldvmspace;
735
736 TSENTER(); /* Here so we don't overlap with mi_startup. */
737
738 td = curthread;
739 p = td->td_proc;
740
741 vfs_mountroot();
742
743 /* Wipe GELI passphrase from the environment. */
744 kern_unsetenv("kern.geom.eli.passphrase");
745
746 /* For Multicons, report which console is primary to both */
747 if (boothowto & RB_MULTIPLE) {
748 if (boothowto & RB_SERIAL)
749 printf("Dual Console: Serial Primary, Video Secondary\n");
750 else
751 printf("Dual Console: Video Primary, Serial Secondary\n");
752 }
753
754 if ((var = kern_getenv("init_path")) != NULL) {
755 strlcpy(init_path, var, sizeof(init_path));
756 freeenv(var);
757 }
758 free_init_path = tmp_init_path = strdup(init_path, M_TEMP);
759
760 while ((path = strsep(&tmp_init_path, ":")) != NULL) {
761 if (bootverbose)
762 printf("start_init: trying %s\n", path);
763
764 memset(&args, 0, sizeof(args));
765 error = exec_alloc_args(&args);
766 if (error != 0)
767 panic("%s: Can't allocate space for init arguments %d",
768 __func__, error);
769
770 error = exec_args_add_fname(&args, path, UIO_SYSSPACE);
771 if (error != 0)
772 panic("%s: Can't add fname %d", __func__, error);
773 error = exec_args_add_arg(&args, path, UIO_SYSSPACE);
774 if (error != 0)
775 panic("%s: Can't add argv[0] %d", __func__, error);
776 if (boothowto & RB_SINGLE)
777 error = exec_args_add_arg(&args, "-s", UIO_SYSSPACE);
778 if (error != 0)
779 panic("%s: Can't add argv[0] %d", __func__, error);
780
781 /*
782 * Now try to exec the program. If can't for any reason
783 * other than it doesn't exist, complain.
784 *
785 * Otherwise, return via fork_trampoline() all the way
786 * to user mode as init!
787 */
788 KASSERT((td->td_pflags & TDP_EXECVMSPC) == 0,
789 ("nested execve"));
790 memset(td->td_frame, 0, sizeof(*td->td_frame));
791 oldvmspace = p->p_vmspace;
792 error = kern_execve(td, &args, NULL, oldvmspace);
793 KASSERT(error != 0,
794 ("kern_execve returned success, not EJUSTRETURN"));
795 if (error == EJUSTRETURN) {
796 exec_cleanup(td, oldvmspace);
797 free(free_init_path, M_TEMP);
798 TSEXIT();
799 return;
800 }
801 if (error != ENOENT)
802 printf("exec %s: error %d\n", path, error);
803 }
804 free(free_init_path, M_TEMP);
805 printf("init: not found in path %s\n", init_path);
806 panic("no init");
807 }
808
809 /*
810 * Like kproc_create(), but runs in its own address space. We do this
811 * early to reserve pid 1. Note special case - do not make it
812 * runnable yet, init execution is started when userspace can be served.
813 */
814 static void
create_init(const void * udata __unused)815 create_init(const void *udata __unused)
816 {
817 struct fork_req fr;
818 struct ucred *newcred, *oldcred;
819 struct thread *td;
820 int error;
821
822 bzero(&fr, sizeof(fr));
823 fr.fr_flags = RFFDG | RFPROC | RFSTOPPED;
824 fr.fr_procp = &initproc;
825 error = fork1(&thread0, &fr);
826 if (error)
827 panic("cannot fork init: %d\n", error);
828 KASSERT(initproc->p_pid == 1, ("create_init: initproc->p_pid != 1"));
829 /* divorce init's credentials from the kernel's */
830 newcred = crget();
831 sx_xlock(&proctree_lock);
832 PROC_LOCK(initproc);
833 initproc->p_flag |= P_SYSTEM | P_INMEM;
834 initproc->p_treeflag |= P_TREE_REAPER;
835 oldcred = initproc->p_ucred;
836 crcopy(newcred, oldcred);
837 #ifdef MAC
838 mac_cred_create_init(newcred);
839 #endif
840 #ifdef AUDIT
841 audit_cred_proc1(newcred);
842 #endif
843 proc_set_cred(initproc, newcred);
844 td = FIRST_THREAD_IN_PROC(initproc);
845 crcowfree(td);
846 td->td_realucred = crcowget(initproc->p_ucred);
847 td->td_ucred = td->td_realucred;
848 PROC_UNLOCK(initproc);
849 sx_xunlock(&proctree_lock);
850 crfree(oldcred);
851 cpu_fork_kthread_handler(FIRST_THREAD_IN_PROC(initproc),
852 start_init, NULL);
853 }
854 SYSINIT(init, SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL);
855
856 /*
857 * Make it runnable now.
858 */
859 static void
kick_init(const void * udata __unused)860 kick_init(const void *udata __unused)
861 {
862 struct thread *td;
863
864 td = FIRST_THREAD_IN_PROC(initproc);
865 thread_lock(td);
866 TD_SET_CAN_RUN(td);
867 sched_add(td, SRQ_BORING);
868 }
869 SYSINIT(kickinit, SI_SUB_KTHREAD_INIT, SI_ORDER_MIDDLE, kick_init, NULL);
870
871 /*
872 * DDB(4).
873 */
874 #ifdef DDB
875 static void
db_show_print_syinit(struct sysinit * sip,bool ddb)876 db_show_print_syinit(struct sysinit *sip, bool ddb)
877 {
878 const char *sname, *funcname;
879 c_db_sym_t sym;
880 db_expr_t offset;
881
882 #define xprint(...) \
883 if (ddb) \
884 db_printf(__VA_ARGS__); \
885 else \
886 printf(__VA_ARGS__)
887
888 if (sip == NULL) {
889 xprint("%s: no sysinit * given\n", __func__);
890 return;
891 }
892
893 sym = db_search_symbol((vm_offset_t)sip, DB_STGY_ANY, &offset);
894 db_symbol_values(sym, &sname, NULL);
895 sym = db_search_symbol((vm_offset_t)sip->func, DB_STGY_PROC, &offset);
896 db_symbol_values(sym, &funcname, NULL);
897 xprint("%s(%p)\n", (sname != NULL) ? sname : "", sip);
898 xprint(" %#08x %#08x\n", sip->subsystem, sip->order);
899 xprint(" %p(%s)(%p)\n",
900 sip->func, (funcname != NULL) ? funcname : "", sip->udata);
901 #undef xprint
902 }
903
DB_SHOW_COMMAND_FLAGS(sysinit,db_show_sysinit,DB_CMD_MEMSAFE)904 DB_SHOW_COMMAND_FLAGS(sysinit, db_show_sysinit, DB_CMD_MEMSAFE)
905 {
906 struct sysinit *sip;
907
908 db_printf("SYSINIT vs Name(Ptr)\n");
909 db_printf(" Subsystem Order\n");
910 db_printf(" Function(Name)(Arg)\n");
911 STAILQ_FOREACH(sip, &sysinit_done_list, next) {
912 db_show_print_syinit(sip, true);
913 if (db_pager_quit)
914 return;
915 }
916 STAILQ_FOREACH(sip, &sysinit_list, next) {
917 db_show_print_syinit(sip, true);
918 if (db_pager_quit)
919 break;
920 }
921 }
922 #endif /* DDB */
923