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