init_main.c revision 230455
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: head/sys/kern/init_main.c 230455 2012-01-22 11:01:36Z pjd $"); 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/racct.h> 65#include <sys/resourcevar.h> 66#include <sys/systm.h> 67#include <sys/signalvar.h> 68#include <sys/vnode.h> 69#include <sys/sysent.h> 70#include <sys/reboot.h> 71#include <sys/sched.h> 72#include <sys/sx.h> 73#include <sys/sysproto.h> 74#include <sys/vmmeter.h> 75#include <sys/unistd.h> 76#include <sys/malloc.h> 77#include <sys/conf.h> 78#include <sys/cpuset.h> 79 80#include <machine/cpu.h> 81 82#include <security/audit/audit.h> 83#include <security/mac/mac_framework.h> 84 85#include <vm/vm.h> 86#include <vm/vm_param.h> 87#include <vm/pmap.h> 88#include <vm/vm_map.h> 89#include <sys/copyright.h> 90 91#include <ddb/ddb.h> 92#include <ddb/db_sym.h> 93 94void mi_startup(void); /* Should be elsewhere */ 95 96/* Components of the first process -- never freed. */ 97static struct session session0; 98static struct pgrp pgrp0; 99struct proc proc0; 100struct thread thread0 __aligned(16); 101struct vmspace vmspace0; 102struct proc *initproc; 103 104int boothowto = 0; /* initialized so that it can be patched */ 105SYSCTL_INT(_debug, OID_AUTO, boothowto, CTLFLAG_RD, &boothowto, 0, 106 "Boot control flags, passed from loader"); 107int bootverbose; 108SYSCTL_INT(_debug, OID_AUTO, bootverbose, CTLFLAG_RW, &bootverbose, 0, 109 "Control the output of verbose kernel messages"); 110 111/* 112 * This ensures that there is at least one entry so that the sysinit_set 113 * symbol is not undefined. A sybsystem ID of SI_SUB_DUMMY is never 114 * executed. 115 */ 116SYSINIT(placeholder, SI_SUB_DUMMY, SI_ORDER_ANY, NULL, NULL); 117 118/* 119 * The sysinit table itself. Items are checked off as the are run. 120 * If we want to register new sysinit types, add them to newsysinit. 121 */ 122SET_DECLARE(sysinit_set, struct sysinit); 123struct sysinit **sysinit, **sysinit_end; 124struct sysinit **newsysinit, **newsysinit_end; 125 126/* 127 * Merge a new sysinit set into the current set, reallocating it if 128 * necessary. This can only be called after malloc is running. 129 */ 130void 131sysinit_add(struct sysinit **set, struct sysinit **set_end) 132{ 133 struct sysinit **newset; 134 struct sysinit **sipp; 135 struct sysinit **xipp; 136 int count; 137 138 count = set_end - set; 139 if (newsysinit) 140 count += newsysinit_end - newsysinit; 141 else 142 count += sysinit_end - sysinit; 143 newset = malloc(count * sizeof(*sipp), M_TEMP, M_NOWAIT); 144 if (newset == NULL) 145 panic("cannot malloc for sysinit"); 146 xipp = newset; 147 if (newsysinit) 148 for (sipp = newsysinit; sipp < newsysinit_end; sipp++) 149 *xipp++ = *sipp; 150 else 151 for (sipp = sysinit; sipp < sysinit_end; sipp++) 152 *xipp++ = *sipp; 153 for (sipp = set; sipp < set_end; sipp++) 154 *xipp++ = *sipp; 155 if (newsysinit) 156 free(newsysinit, M_TEMP); 157 newsysinit = newset; 158 newsysinit_end = newset + count; 159} 160 161/* 162 * System startup; initialize the world, create process 0, mount root 163 * filesystem, and fork to create init and pagedaemon. Most of the 164 * hard work is done in the lower-level initialization routines including 165 * startup(), which does memory initialization and autoconfiguration. 166 * 167 * This allows simple addition of new kernel subsystems that require 168 * boot time initialization. It also allows substitution of subsystem 169 * (for instance, a scheduler, kernel profiler, or VM system) by object 170 * module. Finally, it allows for optional "kernel threads". 171 */ 172void 173mi_startup(void) 174{ 175 176 register struct sysinit **sipp; /* system initialization*/ 177 register struct sysinit **xipp; /* interior loop of sort*/ 178 register struct sysinit *save; /* bubble*/ 179 180#if defined(VERBOSE_SYSINIT) 181 int last; 182 int verbose; 183#endif 184 185 if (boothowto & RB_VERBOSE) 186 bootverbose++; 187 188 if (sysinit == NULL) { 189 sysinit = SET_BEGIN(sysinit_set); 190 sysinit_end = SET_LIMIT(sysinit_set); 191 } 192 193restart: 194 /* 195 * Perform a bubble sort of the system initialization objects by 196 * their subsystem (primary key) and order (secondary key). 197 */ 198 for (sipp = sysinit; sipp < sysinit_end; sipp++) { 199 for (xipp = sipp + 1; xipp < sysinit_end; xipp++) { 200 if ((*sipp)->subsystem < (*xipp)->subsystem || 201 ((*sipp)->subsystem == (*xipp)->subsystem && 202 (*sipp)->order <= (*xipp)->order)) 203 continue; /* skip*/ 204 save = *sipp; 205 *sipp = *xipp; 206 *xipp = save; 207 } 208 } 209 210#if defined(VERBOSE_SYSINIT) 211 last = SI_SUB_COPYRIGHT; 212 verbose = 0; 213#if !defined(DDB) 214 printf("VERBOSE_SYSINIT: DDB not enabled, symbol lookups disabled.\n"); 215#endif 216#endif 217 218 /* 219 * Traverse the (now) ordered list of system initialization tasks. 220 * Perform each task, and continue on to the next task. 221 * 222 * The last item on the list is expected to be the scheduler, 223 * which will not return. 224 */ 225 for (sipp = sysinit; sipp < sysinit_end; sipp++) { 226 227 if ((*sipp)->subsystem == SI_SUB_DUMMY) 228 continue; /* skip dummy task(s)*/ 229 230 if ((*sipp)->subsystem == SI_SUB_DONE) 231 continue; 232 233#if defined(VERBOSE_SYSINIT) 234 if ((*sipp)->subsystem > last) { 235 verbose = 1; 236 last = (*sipp)->subsystem; 237 printf("subsystem %x\n", last); 238 } 239 if (verbose) { 240#if defined(DDB) 241 const char *name; 242 c_db_sym_t sym; 243 db_expr_t offset; 244 245 sym = db_search_symbol((vm_offset_t)(*sipp)->func, 246 DB_STGY_PROC, &offset); 247 db_symbol_values(sym, &name, NULL); 248 if (name != NULL) 249 printf(" %s(%p)... ", name, (*sipp)->udata); 250 else 251#endif 252 printf(" %p(%p)... ", (*sipp)->func, 253 (*sipp)->udata); 254 } 255#endif 256 257 /* Call function */ 258 (*((*sipp)->func))((*sipp)->udata); 259 260#if defined(VERBOSE_SYSINIT) 261 if (verbose) 262 printf("done.\n"); 263#endif 264 265 /* Check off the one we're just done */ 266 (*sipp)->subsystem = SI_SUB_DONE; 267 268 /* Check if we've installed more sysinit items via KLD */ 269 if (newsysinit != NULL) { 270 if (sysinit != SET_BEGIN(sysinit_set)) 271 free(sysinit, M_TEMP); 272 sysinit = newsysinit; 273 sysinit_end = newsysinit_end; 274 newsysinit = NULL; 275 newsysinit_end = NULL; 276 goto restart; 277 } 278 } 279 280 panic("Shouldn't get here!"); 281 /* NOTREACHED*/ 282} 283 284 285/* 286 *************************************************************************** 287 **** 288 **** The following SYSINIT's belong elsewhere, but have not yet 289 **** been moved. 290 **** 291 *************************************************************************** 292 */ 293static void 294print_caddr_t(void *data) 295{ 296 printf("%s", (char *)data); 297} 298 299static void 300print_version(void *data __unused) 301{ 302 int len; 303 304 /* Strip a trailing newline from version. */ 305 len = strlen(version); 306 while (len > 0 && version[len - 1] == '\n') 307 len--; 308 printf("%.*s %s\n", len, version, machine); 309} 310 311SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t, 312 copyright); 313SYSINIT(trademark, SI_SUB_COPYRIGHT, SI_ORDER_SECOND, print_caddr_t, 314 trademark); 315SYSINIT(version, SI_SUB_COPYRIGHT, SI_ORDER_THIRD, print_version, NULL); 316 317#ifdef WITNESS 318static char wit_warn[] = 319 "WARNING: WITNESS option enabled, expect reduced performance.\n"; 320SYSINIT(witwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 1, 321 print_caddr_t, wit_warn); 322SYSINIT(witwarn2, SI_SUB_RUN_SCHEDULER, SI_ORDER_THIRD + 1, 323 print_caddr_t, wit_warn); 324#endif 325 326#ifdef DIAGNOSTIC 327static char diag_warn[] = 328 "WARNING: DIAGNOSTIC option enabled, expect reduced performance.\n"; 329SYSINIT(diagwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 2, 330 print_caddr_t, diag_warn); 331SYSINIT(diagwarn2, SI_SUB_RUN_SCHEDULER, SI_ORDER_THIRD + 2, 332 print_caddr_t, diag_warn); 333#endif 334 335static int 336null_fetch_syscall_args(struct thread *td __unused, 337 struct syscall_args *sa __unused) 338{ 339 340 panic("null_fetch_syscall_args"); 341} 342 343static void 344null_set_syscall_retval(struct thread *td __unused, int error __unused) 345{ 346 347 panic("null_set_syscall_retval"); 348} 349 350struct sysentvec null_sysvec = { 351 .sv_size = 0, 352 .sv_table = NULL, 353 .sv_mask = 0, 354 .sv_sigsize = 0, 355 .sv_sigtbl = NULL, 356 .sv_errsize = 0, 357 .sv_errtbl = NULL, 358 .sv_transtrap = NULL, 359 .sv_fixup = NULL, 360 .sv_sendsig = NULL, 361 .sv_sigcode = NULL, 362 .sv_szsigcode = NULL, 363 .sv_prepsyscall = NULL, 364 .sv_name = "null", 365 .sv_coredump = NULL, 366 .sv_imgact_try = NULL, 367 .sv_minsigstksz = 0, 368 .sv_pagesize = PAGE_SIZE, 369 .sv_minuser = VM_MIN_ADDRESS, 370 .sv_maxuser = VM_MAXUSER_ADDRESS, 371 .sv_usrstack = USRSTACK, 372 .sv_psstrings = PS_STRINGS, 373 .sv_stackprot = VM_PROT_ALL, 374 .sv_copyout_strings = NULL, 375 .sv_setregs = NULL, 376 .sv_fixlimit = NULL, 377 .sv_maxssiz = NULL, 378 .sv_flags = 0, 379 .sv_set_syscall_retval = null_set_syscall_retval, 380 .sv_fetch_syscall_args = null_fetch_syscall_args, 381 .sv_syscallnames = NULL, 382 .sv_schedtail = NULL, 383}; 384 385/* 386 *************************************************************************** 387 **** 388 **** The two following SYSINIT's are proc0 specific glue code. I am not 389 **** convinced that they can not be safely combined, but their order of 390 **** operation has been maintained as the same as the original init_main.c 391 **** for right now. 392 **** 393 **** These probably belong in init_proc.c or kern_proc.c, since they 394 **** deal with proc0 (the fork template process). 395 **** 396 *************************************************************************** 397 */ 398/* ARGSUSED*/ 399static void 400proc0_init(void *dummy __unused) 401{ 402 struct proc *p; 403 struct thread *td; 404 vm_paddr_t pageablemem; 405 int i; 406 407 GIANT_REQUIRED; 408 p = &proc0; 409 td = &thread0; 410 411 /* 412 * Initialize magic number and osrel. 413 */ 414 p->p_magic = P_MAGIC; 415 p->p_osrel = osreldate; 416 417 /* 418 * Initialize thread and process structures. 419 */ 420 procinit(); /* set up proc zone */ 421 threadinit(); /* set up UMA zones */ 422 423 /* 424 * Initialise scheduler resources. 425 * Add scheduler specific parts to proc, thread as needed. 426 */ 427 schedinit(); /* scheduler gets its house in order */ 428 /* 429 * Initialize sleep queue hash table 430 */ 431 sleepinit(); 432 433 /* 434 * additional VM structures 435 */ 436 vm_init2(); 437 438 /* 439 * Create process 0 (the swapper). 440 */ 441 LIST_INSERT_HEAD(&allproc, p, p_list); 442 LIST_INSERT_HEAD(PIDHASH(0), p, p_hash); 443 mtx_init(&pgrp0.pg_mtx, "process group", NULL, MTX_DEF | MTX_DUPOK); 444 p->p_pgrp = &pgrp0; 445 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash); 446 LIST_INIT(&pgrp0.pg_members); 447 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist); 448 449 pgrp0.pg_session = &session0; 450 mtx_init(&session0.s_mtx, "session", NULL, MTX_DEF); 451 refcount_init(&session0.s_count, 1); 452 session0.s_leader = p; 453 454 p->p_sysent = &null_sysvec; 455 p->p_flag = P_SYSTEM | P_INMEM; 456 p->p_state = PRS_NORMAL; 457 knlist_init_mtx(&p->p_klist, &p->p_mtx); 458 STAILQ_INIT(&p->p_ktr); 459 p->p_nice = NZERO; 460 td->td_tid = PID_MAX + 1; 461 LIST_INSERT_HEAD(TIDHASH(td->td_tid), td, td_hash); 462 td->td_state = TDS_RUNNING; 463 td->td_pri_class = PRI_TIMESHARE; 464 td->td_user_pri = PUSER; 465 td->td_base_user_pri = PUSER; 466 td->td_lend_user_pri = PRI_MAX; 467 td->td_priority = PVM; 468 td->td_base_pri = PVM; 469 td->td_oncpu = 0; 470 td->td_flags = TDF_INMEM; 471 td->td_pflags = 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 p->p_ucred->cr_loginclass = loginclass_find("default"); 492#ifdef AUDIT 493 audit_cred_kproc0(p->p_ucred); 494#endif 495#ifdef MAC 496 mac_cred_create_swapper(p->p_ucred); 497#endif 498 td->td_ucred = crhold(p->p_ucred); 499 500 /* Create sigacts. */ 501 p->p_sigacts = sigacts_alloc(); 502 503 /* Initialize signal state for process 0. */ 504 siginit(&proc0); 505 506 /* Create the file descriptor table. */ 507 p->p_fd = fdinit(NULL); 508 p->p_fdtol = NULL; 509 510 /* Create the limits structures. */ 511 p->p_limit = lim_alloc(); 512 for (i = 0; i < RLIM_NLIMITS; i++) 513 p->p_limit->pl_rlimit[i].rlim_cur = 514 p->p_limit->pl_rlimit[i].rlim_max = RLIM_INFINITY; 515 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_cur = 516 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles; 517 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_cur = 518 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc; 519 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_cur = dfldsiz; 520 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_max = maxdsiz; 521 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_cur = dflssiz; 522 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_max = maxssiz; 523 /* Cast to avoid overflow on i386/PAE. */ 524 pageablemem = ptoa((vm_paddr_t)cnt.v_free_count); 525 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_cur = 526 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_max = pageablemem; 527 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = pageablemem / 3; 528 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_max = pageablemem; 529 p->p_cpulimit = RLIM_INFINITY; 530 531 /* Initialize resource accounting structures. */ 532 racct_create(&p->p_racct); 533 534 p->p_stats = pstats_alloc(); 535 536 /* Allocate a prototype map so we have something to fork. */ 537 pmap_pinit0(vmspace_pmap(&vmspace0)); 538 p->p_vmspace = &vmspace0; 539 vmspace0.vm_refcnt = 1; 540 541 /* 542 * proc0 is not expected to enter usermode, so there is no special 543 * handling for sv_minuser here, like is done for exec_new_vmspace(). 544 */ 545 vm_map_init(&vmspace0.vm_map, vmspace_pmap(&vmspace0), 546 p->p_sysent->sv_minuser, p->p_sysent->sv_maxuser); 547 548 /* 549 * Call the init and ctor for the new thread and proc. We wait 550 * to do this until all other structures are fairly sane. 551 */ 552 EVENTHANDLER_INVOKE(process_init, p); 553 EVENTHANDLER_INVOKE(thread_init, td); 554 EVENTHANDLER_INVOKE(process_ctor, p); 555 EVENTHANDLER_INVOKE(thread_ctor, td); 556 557 /* 558 * Charge root for one process. 559 */ 560 (void)chgproccnt(p->p_ucred->cr_ruidinfo, 1, 0); 561 PROC_LOCK(p); 562 racct_add_force(p, RACCT_NPROC, 1); 563 PROC_UNLOCK(p); 564} 565SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL); 566 567/* ARGSUSED*/ 568static void 569proc0_post(void *dummy __unused) 570{ 571 struct timespec ts; 572 struct proc *p; 573 struct rusage ru; 574 struct thread *td; 575 576 /* 577 * Now we can look at the time, having had a chance to verify the 578 * time from the filesystem. Pretend that proc0 started now. 579 */ 580 sx_slock(&allproc_lock); 581 FOREACH_PROC_IN_SYSTEM(p) { 582 microuptime(&p->p_stats->p_start); 583 PROC_SLOCK(p); 584 rufetch(p, &ru); /* Clears thread stats */ 585 PROC_SUNLOCK(p); 586 p->p_rux.rux_runtime = 0; 587 p->p_rux.rux_uticks = 0; 588 p->p_rux.rux_sticks = 0; 589 p->p_rux.rux_iticks = 0; 590 FOREACH_THREAD_IN_PROC(p, td) { 591 td->td_runtime = 0; 592 } 593 } 594 sx_sunlock(&allproc_lock); 595 PCPU_SET(switchtime, cpu_ticks()); 596 PCPU_SET(switchticks, ticks); 597 598 /* 599 * Give the ``random'' number generator a thump. 600 */ 601 nanotime(&ts); 602 srandom(ts.tv_sec ^ ts.tv_nsec); 603} 604SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL); 605 606static void 607random_init(void *dummy __unused) 608{ 609 610 /* 611 * After CPU has been started we have some randomness on most 612 * platforms via get_cyclecount(). For platforms that don't 613 * we will reseed random(9) in proc0_post() as well. 614 */ 615 srandom(get_cyclecount()); 616} 617SYSINIT(random, SI_SUB_RANDOM, SI_ORDER_FIRST, random_init, NULL); 618 619/* 620 *************************************************************************** 621 **** 622 **** The following SYSINIT's and glue code should be moved to the 623 **** respective files on a per subsystem basis. 624 **** 625 *************************************************************************** 626 */ 627 628 629/* 630 *************************************************************************** 631 **** 632 **** The following code probably belongs in another file, like 633 **** kern/init_init.c. 634 **** 635 *************************************************************************** 636 */ 637 638/* 639 * List of paths to try when searching for "init". 640 */ 641static char init_path[MAXPATHLEN] = 642#ifdef INIT_PATH 643 __XSTRING(INIT_PATH); 644#else 645 "/sbin/init:/sbin/oinit:/sbin/init.bak:/rescue/init"; 646#endif 647SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0, 648 "Path used to search the init process"); 649 650/* 651 * Shutdown timeout of init(8). 652 * Unused within kernel, but used to control init(8), hence do not remove. 653 */ 654#ifndef INIT_SHUTDOWN_TIMEOUT 655#define INIT_SHUTDOWN_TIMEOUT 120 656#endif 657static int init_shutdown_timeout = INIT_SHUTDOWN_TIMEOUT; 658SYSCTL_INT(_kern, OID_AUTO, init_shutdown_timeout, 659 CTLFLAG_RW, &init_shutdown_timeout, 0, "Shutdown timeout of init(8). " 660 "Unused within kernel, but used to control init(8)"); 661 662/* 663 * Start the initial user process; try exec'ing each pathname in init_path. 664 * The program is invoked with one argument containing the boot flags. 665 */ 666static void 667start_init(void *dummy) 668{ 669 vm_offset_t addr; 670 struct execve_args args; 671 int options, error; 672 char *var, *path, *next, *s; 673 char *ucp, **uap, *arg0, *arg1; 674 struct thread *td; 675 struct proc *p; 676 677 mtx_lock(&Giant); 678 679 GIANT_REQUIRED; 680 681 td = curthread; 682 p = td->td_proc; 683 684 vfs_mountroot(); 685 686 /* 687 * Need just enough stack to hold the faked-up "execve()" arguments. 688 */ 689 addr = p->p_sysent->sv_usrstack - PAGE_SIZE; 690 if (vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &addr, PAGE_SIZE, 691 FALSE, VM_PROT_ALL, VM_PROT_ALL, 0) != 0) 692 panic("init: couldn't allocate argument space"); 693 p->p_vmspace->vm_maxsaddr = (caddr_t)addr; 694 p->p_vmspace->vm_ssize = 1; 695 696 if ((var = getenv("init_path")) != NULL) { 697 strlcpy(init_path, var, sizeof(init_path)); 698 freeenv(var); 699 } 700 701 for (path = init_path; *path != '\0'; path = next) { 702 while (*path == ':') 703 path++; 704 if (*path == '\0') 705 break; 706 for (next = path; *next != '\0' && *next != ':'; next++) 707 /* nothing */ ; 708 if (bootverbose) 709 printf("start_init: trying %.*s\n", (int)(next - path), 710 path); 711 712 /* 713 * Move out the boot flag argument. 714 */ 715 options = 0; 716 ucp = (char *)p->p_sysent->sv_usrstack; 717 (void)subyte(--ucp, 0); /* trailing zero */ 718 if (boothowto & RB_SINGLE) { 719 (void)subyte(--ucp, 's'); 720 options = 1; 721 } 722#ifdef notyet 723 if (boothowto & RB_FASTBOOT) { 724 (void)subyte(--ucp, 'f'); 725 options = 1; 726 } 727#endif 728 729#ifdef BOOTCDROM 730 (void)subyte(--ucp, 'C'); 731 options = 1; 732#endif 733 734 if (options == 0) 735 (void)subyte(--ucp, '-'); 736 (void)subyte(--ucp, '-'); /* leading hyphen */ 737 arg1 = ucp; 738 739 /* 740 * Move out the file name (also arg 0). 741 */ 742 (void)subyte(--ucp, 0); 743 for (s = next - 1; s >= path; s--) 744 (void)subyte(--ucp, *s); 745 arg0 = ucp; 746 747 /* 748 * Move out the arg pointers. 749 */ 750 uap = (char **)((intptr_t)ucp & ~(sizeof(intptr_t)-1)); 751 (void)suword((caddr_t)--uap, (long)0); /* terminator */ 752 (void)suword((caddr_t)--uap, (long)(intptr_t)arg1); 753 (void)suword((caddr_t)--uap, (long)(intptr_t)arg0); 754 755 /* 756 * Point at the arguments. 757 */ 758 args.fname = arg0; 759 args.argv = uap; 760 args.envv = NULL; 761 762 /* 763 * Now try to exec the program. If can't for any reason 764 * other than it doesn't exist, complain. 765 * 766 * Otherwise, return via fork_trampoline() all the way 767 * to user mode as init! 768 */ 769 if ((error = sys_execve(td, &args)) == 0) { 770 mtx_unlock(&Giant); 771 return; 772 } 773 if (error != ENOENT) 774 printf("exec %.*s: error %d\n", (int)(next - path), 775 path, error); 776 } 777 printf("init: not found in path %s\n", init_path); 778 panic("no init"); 779} 780 781/* 782 * Like kproc_create(), but runs in it's own address space. 783 * We do this early to reserve pid 1. 784 * 785 * Note special case - do not make it runnable yet. Other work 786 * in progress will change this more. 787 */ 788static void 789create_init(const void *udata __unused) 790{ 791 struct ucred *newcred, *oldcred; 792 int error; 793 794 error = fork1(&thread0, RFFDG | RFPROC | RFSTOPPED, 0, &initproc, 795 NULL, 0); 796 if (error) 797 panic("cannot fork init: %d\n", error); 798 KASSERT(initproc->p_pid == 1, ("create_init: initproc->p_pid != 1")); 799 /* divorce init's credentials from the kernel's */ 800 newcred = crget(); 801 PROC_LOCK(initproc); 802 initproc->p_flag |= P_SYSTEM | P_INMEM; 803 oldcred = initproc->p_ucred; 804 crcopy(newcred, oldcred); 805#ifdef MAC 806 mac_cred_create_init(newcred); 807#endif 808#ifdef AUDIT 809 audit_cred_proc1(newcred); 810#endif 811 initproc->p_ucred = newcred; 812 PROC_UNLOCK(initproc); 813 crfree(oldcred); 814 cred_update_thread(FIRST_THREAD_IN_PROC(initproc)); 815 cpu_set_fork_handler(FIRST_THREAD_IN_PROC(initproc), start_init, NULL); 816} 817SYSINIT(init, SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL); 818 819/* 820 * Make it runnable now. 821 */ 822static void 823kick_init(const void *udata __unused) 824{ 825 struct thread *td; 826 827 td = FIRST_THREAD_IN_PROC(initproc); 828 thread_lock(td); 829 TD_SET_CAN_RUN(td); 830 sched_add(td, SRQ_BORING); 831 thread_unlock(td); 832} 833SYSINIT(kickinit, SI_SUB_KTHREAD_INIT, SI_ORDER_FIRST, kick_init, NULL); 834