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