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/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 94 void mi_startup(void); /* Should be elsewhere */ 95 96 /* Components of the first process -- never freed. */ 97 static struct session session0; 98 static struct pgrp pgrp0; 99 struct proc proc0; 100 struct thread thread0 __aligned(16); 101 struct vmspace vmspace0; 102 struct proc *initproc; 103 104 #ifndef BOOTHOWTO 105 #define BOOTHOWTO 0 106 #endif 107 int boothowto = BOOTHOWTO; /* initialized so that it can be patched */ 108 SYSCTL_INT(_debug, OID_AUTO, boothowto, CTLFLAG_RD, &boothowto, 0, 109 "Boot control flags, passed from loader"); 110 111 #ifndef BOOTVERBOSE 112 #define BOOTVERBOSE 0 113 #endif 114 int bootverbose = BOOTVERBOSE; 115 SYSCTL_INT(_debug, OID_AUTO, bootverbose, CTLFLAG_RW, &bootverbose, 0, 116 "Control the output of verbose kernel messages"); 117 118 /* 119 * This ensures that there is at least one entry so that the sysinit_set 120 * symbol is not undefined. A sybsystem ID of SI_SUB_DUMMY is never 121 * executed. 122 */ 123 SYSINIT(placeholder, SI_SUB_DUMMY, SI_ORDER_ANY, NULL, NULL); 124 125 /* 126 * The sysinit table itself. Items are checked off as the are run. 127 * If we want to register new sysinit types, add them to newsysinit. 128 */ 129 SET_DECLARE(sysinit_set, struct sysinit); 130 struct sysinit **sysinit, **sysinit_end; 131 struct sysinit **newsysinit, **newsysinit_end; 132 133 /* 134 * Merge a new sysinit set into the current set, reallocating it if 135 * necessary. This can only be called after malloc is running. 136 */ 137 void 138 sysinit_add(struct sysinit **set, struct sysinit **set_end) 139 { 140 struct sysinit **newset; 141 struct sysinit **sipp; 142 struct sysinit **xipp; 143 int count; 144 145 count = set_end - set; 146 if (newsysinit) 147 count += newsysinit_end - newsysinit; 148 else 149 count += sysinit_end - sysinit; 150 newset = malloc(count * sizeof(*sipp), M_TEMP, M_NOWAIT); 151 if (newset == NULL) 152 panic("cannot malloc for sysinit"); 153 xipp = newset; 154 if (newsysinit) 155 for (sipp = newsysinit; sipp < newsysinit_end; sipp++) 156 *xipp++ = *sipp; 157 else 158 for (sipp = sysinit; sipp < sysinit_end; sipp++) 159 *xipp++ = *sipp; 160 for (sipp = set; sipp < set_end; sipp++) 161 *xipp++ = *sipp; 162 if (newsysinit) 163 free(newsysinit, M_TEMP); 164 newsysinit = newset; 165 newsysinit_end = newset + count; 166 } 167 168 #if defined (DDB) && defined(VERBOSE_SYSINIT) 169 static const char * 170 symbol_name(vm_offset_t va, db_strategy_t strategy) 171 { 172 const char *name; 173 c_db_sym_t sym; 174 db_expr_t offset; 175 176 if (va == 0) 177 return (NULL); 178 sym = db_search_symbol(va, strategy, &offset); 179 if (offset != 0) 180 return (NULL); 181 db_symbol_values(sym, &name, NULL); 182 return (name); 183 } 184 #endif 185 186 /* 187 * System startup; initialize the world, create process 0, mount root 188 * filesystem, and fork to create init and pagedaemon. Most of the 189 * hard work is done in the lower-level initialization routines including 190 * startup(), which does memory initialization and autoconfiguration. 191 * 192 * This allows simple addition of new kernel subsystems that require 193 * boot time initialization. It also allows substitution of subsystem 194 * (for instance, a scheduler, kernel profiler, or VM system) by object 195 * module. Finally, it allows for optional "kernel threads". 196 */ 197 void 198 mi_startup(void) 199 { 200 201 register struct sysinit **sipp; /* system initialization*/ 202 register struct sysinit **xipp; /* interior loop of sort*/ 203 register struct sysinit *save; /* bubble*/ 204 205 #if defined(VERBOSE_SYSINIT) 206 int last; 207 int verbose; 208 #endif 209 210 if (boothowto & RB_VERBOSE) 211 bootverbose++; 212 213 if (sysinit == NULL) { 214 sysinit = SET_BEGIN(sysinit_set); 215 sysinit_end = SET_LIMIT(sysinit_set); 216 } 217 218 restart: 219 /* 220 * Perform a bubble sort of the system initialization objects by 221 * their subsystem (primary key) and order (secondary key). 222 */ 223 for (sipp = sysinit; sipp < sysinit_end; sipp++) { 224 for (xipp = sipp + 1; xipp < sysinit_end; xipp++) { 225 if ((*sipp)->subsystem < (*xipp)->subsystem || 226 ((*sipp)->subsystem == (*xipp)->subsystem && 227 (*sipp)->order <= (*xipp)->order)) 228 continue; /* skip*/ 229 save = *sipp; 230 *sipp = *xipp; 231 *xipp = save; 232 } 233 } 234 235 #if defined(VERBOSE_SYSINIT) 236 last = SI_SUB_COPYRIGHT; 237 verbose = 0; 238 #if !defined(DDB) 239 printf("VERBOSE_SYSINIT: DDB not enabled, symbol lookups disabled.\n"); 240 #endif 241 #endif 242 243 /* 244 * Traverse the (now) ordered list of system initialization tasks. 245 * Perform each task, and continue on to the next task. 246 * 247 * The last item on the list is expected to be the scheduler, 248 * which will not return. 249 */ 250 for (sipp = sysinit; sipp < sysinit_end; sipp++) { 251 252 if ((*sipp)->subsystem == SI_SUB_DUMMY) 253 continue; /* skip dummy task(s)*/ 254 255 if ((*sipp)->subsystem == SI_SUB_DONE) 256 continue; 257 258 #if defined(VERBOSE_SYSINIT) 259 if ((*sipp)->subsystem > last) { 260 verbose = 1; 261 last = (*sipp)->subsystem; 262 printf("subsystem %x\n", last); 263 } 264 if (verbose) { 265 #if defined(DDB) 266 const char *func, *data; 267 268 func = symbol_name((vm_offset_t)(*sipp)->func, 269 DB_STGY_PROC); 270 data = symbol_name((vm_offset_t)(*sipp)->udata, 271 DB_STGY_ANY); 272 if (func != NULL && data != NULL) 273 printf(" %s(&%s)... ", func, data); 274 else if (func != NULL) 275 printf(" %s(%p)... ", func, (*sipp)->udata); 276 else 277 #endif 278 printf(" %p(%p)... ", (*sipp)->func, 279 (*sipp)->udata); 280 } 281 #endif 282 283 /* Call function */ 284 (*((*sipp)->func))((*sipp)->udata); 285 286 #if defined(VERBOSE_SYSINIT) 287 if (verbose) 288 printf("done.\n"); 289 #endif 290 291 /* Check off the one we're just done */ 292 (*sipp)->subsystem = SI_SUB_DONE; 293 294 /* Check if we've installed more sysinit items via KLD */ 295 if (newsysinit != NULL) { 296 if (sysinit != SET_BEGIN(sysinit_set)) 297 free(sysinit, M_TEMP); 298 sysinit = newsysinit; 299 sysinit_end = newsysinit_end; 300 newsysinit = NULL; 301 newsysinit_end = NULL; 302 goto restart; 303 } 304 } 305 306 panic("Shouldn't get here!"); 307 /* NOTREACHED*/ 308 } 309 310 311 /* 312 *************************************************************************** 313 **** 314 **** The following SYSINIT's belong elsewhere, but have not yet 315 **** been moved. 316 **** 317 *************************************************************************** 318 */ 319 static void 320 print_caddr_t(void *data) 321 { 322 printf("%s", (char *)data); 323 } 324 325 static void 326 print_version(void *data __unused) 327 { 328 int len; 329 330 /* Strip a trailing newline from version. */ 331 len = strlen(version); 332 while (len > 0 && version[len - 1] == '\n') 333 len--; 334 printf("%.*s %s\n", len, version, machine); 335 printf("%s\n", compiler_version); 336 } 337 338 SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t, 339 copyright); 340 SYSINIT(trademark, SI_SUB_COPYRIGHT, SI_ORDER_SECOND, print_caddr_t, 341 trademark); 342 SYSINIT(version, SI_SUB_COPYRIGHT, SI_ORDER_THIRD, print_version, NULL); 343 344 #ifdef WITNESS 345 static char wit_warn[] = 346 "WARNING: WITNESS option enabled, expect reduced performance.\n"; 347 SYSINIT(witwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 1, 348 print_caddr_t, wit_warn); 349 SYSINIT(witwarn2, SI_SUB_RUN_SCHEDULER, SI_ORDER_THIRD + 1, 350 print_caddr_t, wit_warn); 351 #endif 352 353 #ifdef DIAGNOSTIC 354 static char diag_warn[] = 355 "WARNING: DIAGNOSTIC option enabled, expect reduced performance.\n"; 356 SYSINIT(diagwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 2, 357 print_caddr_t, diag_warn); 358 SYSINIT(diagwarn2, SI_SUB_RUN_SCHEDULER, SI_ORDER_THIRD + 2, 359 print_caddr_t, diag_warn); 360 #endif 361 362 static int 363 null_fetch_syscall_args(struct thread *td __unused, 364 struct syscall_args *sa __unused) 365 { 366 367 panic("null_fetch_syscall_args"); 368 } 369 370 static void 371 null_set_syscall_retval(struct thread *td __unused, int error __unused) 372 { 373 374 panic("null_set_syscall_retval"); 375 } 376 377 struct sysentvec null_sysvec = { 378 .sv_size = 0, 379 .sv_table = NULL, 380 .sv_mask = 0, 381 .sv_sigsize = 0, 382 .sv_sigtbl = NULL, 383 .sv_errsize = 0, 384 .sv_errtbl = NULL, 385 .sv_transtrap = NULL, 386 .sv_fixup = NULL, 387 .sv_sendsig = NULL, 388 .sv_sigcode = NULL, 389 .sv_szsigcode = NULL, 390 .sv_prepsyscall = NULL, 391 .sv_name = "null", 392 .sv_coredump = NULL, 393 .sv_imgact_try = NULL, 394 .sv_minsigstksz = 0, 395 .sv_pagesize = PAGE_SIZE, 396 .sv_minuser = VM_MIN_ADDRESS, 397 .sv_maxuser = VM_MAXUSER_ADDRESS, 398 .sv_usrstack = USRSTACK, 399 .sv_psstrings = PS_STRINGS, 400 .sv_stackprot = VM_PROT_ALL, 401 .sv_copyout_strings = NULL, 402 .sv_setregs = NULL, 403 .sv_fixlimit = NULL, 404 .sv_maxssiz = NULL, 405 .sv_flags = 0, 406 .sv_set_syscall_retval = null_set_syscall_retval, 407 .sv_fetch_syscall_args = null_fetch_syscall_args, 408 .sv_syscallnames = NULL, 409 .sv_schedtail = NULL, 410 }; 411 412 /* 413 *************************************************************************** 414 **** 415 **** The two following SYSINIT's are proc0 specific glue code. I am not 416 **** convinced that they can not be safely combined, but their order of 417 **** operation has been maintained as the same as the original init_main.c 418 **** for right now. 419 **** 420 **** These probably belong in init_proc.c or kern_proc.c, since they 421 **** deal with proc0 (the fork template process). 422 **** 423 *************************************************************************** 424 */ 425 /* ARGSUSED*/ 426 static void 427 proc0_init(void *dummy __unused) 428 { 429 struct proc *p; 430 struct thread *td; 431 vm_paddr_t pageablemem; 432 int i; 433 434 GIANT_REQUIRED; 435 p = &proc0; 436 td = &thread0; 437 438 /* 439 * Initialize magic number and osrel. 440 */ 441 p->p_magic = P_MAGIC; 442 p->p_osrel = osreldate; 443 444 /* 445 * Initialize thread and process structures. 446 */ 447 procinit(); /* set up proc zone */ 448 threadinit(); /* set up UMA zones */ 449 450 /* 451 * Initialise scheduler resources. 452 * Add scheduler specific parts to proc, thread as needed. 453 */ 454 schedinit(); /* scheduler gets its house in order */ 455 /* 456 * Initialize sleep queue hash table 457 */ 458 sleepinit(); 459 460 /* 461 * additional VM structures 462 */ 463 vm_init2(); 464 465 /* 466 * Create process 0 (the swapper). 467 */ 468 LIST_INSERT_HEAD(&allproc, p, p_list); 469 LIST_INSERT_HEAD(PIDHASH(0), p, p_hash); 470 mtx_init(&pgrp0.pg_mtx, "process group", NULL, MTX_DEF | MTX_DUPOK); 471 p->p_pgrp = &pgrp0; 472 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash); 473 LIST_INIT(&pgrp0.pg_members); 474 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist); 475 476 pgrp0.pg_session = &session0; 477 mtx_init(&session0.s_mtx, "session", NULL, MTX_DEF); 478 refcount_init(&session0.s_count, 1); 479 session0.s_leader = p; 480 481 p->p_sysent = &null_sysvec; 482 p->p_flag = P_SYSTEM | P_INMEM; 483 p->p_state = PRS_NORMAL; 484 knlist_init_mtx(&p->p_klist, &p->p_mtx); 485 STAILQ_INIT(&p->p_ktr); 486 p->p_nice = NZERO; 487 /* pid_max cannot be greater than PID_MAX */ 488 td->td_tid = PID_MAX + 1; 489 LIST_INSERT_HEAD(TIDHASH(td->td_tid), td, td_hash); 490 td->td_state = TDS_RUNNING; 491 td->td_pri_class = PRI_TIMESHARE; 492 td->td_user_pri = PUSER; 493 td->td_base_user_pri = PUSER; 494 td->td_lend_user_pri = PRI_MAX; 495 td->td_priority = PVM; 496 td->td_base_pri = PVM; 497 td->td_oncpu = 0; 498 td->td_flags = TDF_INMEM; 499 td->td_pflags = TDP_KTHREAD; 500 td->td_cpuset = cpuset_thread0(); 501 prison0.pr_cpuset = cpuset_ref(td->td_cpuset); 502 p->p_peers = 0; 503 p->p_leader = p; 504 505 506 strncpy(p->p_comm, "kernel", sizeof (p->p_comm)); 507 strncpy(td->td_name, "swapper", sizeof (td->td_name)); 508 509 callout_init_mtx(&p->p_itcallout, &p->p_mtx, 0); 510 callout_init_mtx(&p->p_limco, &p->p_mtx, 0); 511 callout_init(&td->td_slpcallout, CALLOUT_MPSAFE); 512 513 /* Create credentials. */ 514 p->p_ucred = crget(); 515 p->p_ucred->cr_ngroups = 1; /* group 0 */ 516 p->p_ucred->cr_uidinfo = uifind(0); 517 p->p_ucred->cr_ruidinfo = uifind(0); 518 p->p_ucred->cr_prison = &prison0; 519 p->p_ucred->cr_loginclass = loginclass_find("default"); 520 #ifdef AUDIT 521 audit_cred_kproc0(p->p_ucred); 522 #endif 523 #ifdef MAC 524 mac_cred_create_swapper(p->p_ucred); 525 #endif 526 td->td_ucred = crhold(p->p_ucred); 527 528 /* Create sigacts. */ 529 p->p_sigacts = sigacts_alloc(); 530 531 /* Initialize signal state for process 0. */ 532 siginit(&proc0); 533 534 /* Create the file descriptor table. */ 535 p->p_fd = fdinit(NULL); 536 p->p_fdtol = NULL; 537 538 /* Create the limits structures. */ 539 p->p_limit = lim_alloc(); 540 for (i = 0; i < RLIM_NLIMITS; i++) 541 p->p_limit->pl_rlimit[i].rlim_cur = 542 p->p_limit->pl_rlimit[i].rlim_max = RLIM_INFINITY; 543 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_cur = 544 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles; 545 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_cur = 546 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc; 547 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_cur = dfldsiz; 548 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_max = maxdsiz; 549 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_cur = dflssiz; 550 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_max = maxssiz; 551 /* Cast to avoid overflow on i386/PAE. */ 552 pageablemem = ptoa((vm_paddr_t)cnt.v_free_count); 553 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_cur = 554 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_max = pageablemem; 555 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = pageablemem / 3; 556 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_max = pageablemem; 557 p->p_cpulimit = RLIM_INFINITY; 558 559 /* Initialize resource accounting structures. */ 560 racct_create(&p->p_racct); 561 562 p->p_stats = pstats_alloc(); 563 564 /* Allocate a prototype map so we have something to fork. */ 565 pmap_pinit0(vmspace_pmap(&vmspace0)); 566 p->p_vmspace = &vmspace0; 567 vmspace0.vm_refcnt = 1; 568 569 /* 570 * proc0 is not expected to enter usermode, so there is no special 571 * handling for sv_minuser here, like is done for exec_new_vmspace(). 572 */ 573 vm_map_init(&vmspace0.vm_map, vmspace_pmap(&vmspace0), 574 p->p_sysent->sv_minuser, p->p_sysent->sv_maxuser); 575 576 /* 577 * Call the init and ctor for the new thread and proc. We wait 578 * to do this until all other structures are fairly sane. 579 */ 580 EVENTHANDLER_INVOKE(process_init, p); 581 EVENTHANDLER_INVOKE(thread_init, td); 582 EVENTHANDLER_INVOKE(process_ctor, p); 583 EVENTHANDLER_INVOKE(thread_ctor, td); 584 585 /* 586 * Charge root for one process. 587 */ 588 (void)chgproccnt(p->p_ucred->cr_ruidinfo, 1, 0); 589 PROC_LOCK(p); 590 racct_add_force(p, RACCT_NPROC, 1); 591 PROC_UNLOCK(p); 592 } 593 SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL); 594 595 /* ARGSUSED*/ 596 static void 597 proc0_post(void *dummy __unused) 598 { 599 struct timespec ts; 600 struct proc *p; 601 struct rusage ru; 602 struct thread *td; 603 604 /* 605 * Now we can look at the time, having had a chance to verify the 606 * time from the filesystem. Pretend that proc0 started now. 607 */ 608 sx_slock(&allproc_lock); 609 FOREACH_PROC_IN_SYSTEM(p) { 610 microuptime(&p->p_stats->p_start); 611 PROC_SLOCK(p); 612 rufetch(p, &ru); /* Clears thread stats */ 613 PROC_SUNLOCK(p); 614 p->p_rux.rux_runtime = 0; 615 p->p_rux.rux_uticks = 0; 616 p->p_rux.rux_sticks = 0; 617 p->p_rux.rux_iticks = 0; 618 FOREACH_THREAD_IN_PROC(p, td) { 619 td->td_runtime = 0; 620 } 621 } 622 sx_sunlock(&allproc_lock); 623 PCPU_SET(switchtime, cpu_ticks()); 624 PCPU_SET(switchticks, ticks); 625 626 /* 627 * Give the ``random'' number generator a thump. 628 */ 629 nanotime(&ts); 630 srandom(ts.tv_sec ^ ts.tv_nsec); 631 } 632 SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL); 633 634 static void 635 random_init(void *dummy __unused) 636 { 637 638 /* 639 * After CPU has been started we have some randomness on most 640 * platforms via get_cyclecount(). For platforms that don't 641 * we will reseed random(9) in proc0_post() as well. 642 */ 643 srandom(get_cyclecount()); 644 } 645 SYSINIT(random, SI_SUB_RANDOM, SI_ORDER_FIRST, random_init, NULL); 646 647 /* 648 *************************************************************************** 649 **** 650 **** The following SYSINIT's and glue code should be moved to the 651 **** respective files on a per subsystem basis. 652 **** 653 *************************************************************************** 654 */ 655 656 657 /* 658 *************************************************************************** 659 **** 660 **** The following code probably belongs in another file, like 661 **** kern/init_init.c. 662 **** 663 *************************************************************************** 664 */ 665 666 /* 667 * List of paths to try when searching for "init". 668 */ 669 static char init_path[MAXPATHLEN] = 670 #ifdef INIT_PATH 671 __XSTRING(INIT_PATH); 672 #else 673 "/sbin/init:/sbin/oinit:/sbin/init.bak:/rescue/init"; 674 #endif 675 SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0, 676 "Path used to search the init process"); 677 678 /* 679 * Shutdown timeout of init(8). 680 * Unused within kernel, but used to control init(8), hence do not remove. 681 */ 682 #ifndef INIT_SHUTDOWN_TIMEOUT 683 #define INIT_SHUTDOWN_TIMEOUT 120 684 #endif 685 static int init_shutdown_timeout = INIT_SHUTDOWN_TIMEOUT; 686 SYSCTL_INT(_kern, OID_AUTO, init_shutdown_timeout, 687 CTLFLAG_RW, &init_shutdown_timeout, 0, "Shutdown timeout of init(8). " 688 "Unused within kernel, but used to control init(8)"); 689 690 /* 691 * Start the initial user process; try exec'ing each pathname in init_path. 692 * The program is invoked with one argument containing the boot flags. 693 */ 694 static void 695 start_init(void *dummy) 696 { 697 vm_offset_t addr; 698 struct execve_args args; 699 int options, error; 700 char *var, *path, *next, *s; 701 char *ucp, **uap, *arg0, *arg1; 702 struct thread *td; 703 struct proc *p; 704 705 mtx_lock(&Giant); 706 707 GIANT_REQUIRED; 708 709 td = curthread; 710 p = td->td_proc; 711 712 vfs_mountroot(); 713 714 /* 715 * Need just enough stack to hold the faked-up "execve()" arguments. 716 */ 717 addr = p->p_sysent->sv_usrstack - PAGE_SIZE; 718 if (vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &addr, PAGE_SIZE, 719 FALSE, VM_PROT_ALL, VM_PROT_ALL, 0) != 0) 720 panic("init: couldn't allocate argument space"); 721 p->p_vmspace->vm_maxsaddr = (caddr_t)addr; 722 p->p_vmspace->vm_ssize = 1; 723 724 if ((var = getenv("init_path")) != NULL) { 725 strlcpy(init_path, var, sizeof(init_path)); 726 freeenv(var); 727 } 728 729 for (path = init_path; *path != '\0'; path = next) { 730 while (*path == ':') 731 path++; 732 if (*path == '\0') 733 break; 734 for (next = path; *next != '\0' && *next != ':'; next++) 735 /* nothing */ ; 736 if (bootverbose) 737 printf("start_init: trying %.*s\n", (int)(next - path), 738 path); 739 740 /* 741 * Move out the boot flag argument. 742 */ 743 options = 0; 744 ucp = (char *)p->p_sysent->sv_usrstack; 745 (void)subyte(--ucp, 0); /* trailing zero */ 746 if (boothowto & RB_SINGLE) { 747 (void)subyte(--ucp, 's'); 748 options = 1; 749 } 750 #ifdef notyet 751 if (boothowto & RB_FASTBOOT) { 752 (void)subyte(--ucp, 'f'); 753 options = 1; 754 } 755 #endif 756 757 #ifdef BOOTCDROM 758 (void)subyte(--ucp, 'C'); 759 options = 1; 760 #endif 761 762 if (options == 0) 763 (void)subyte(--ucp, '-'); 764 (void)subyte(--ucp, '-'); /* leading hyphen */ 765 arg1 = ucp; 766 767 /* 768 * Move out the file name (also arg 0). 769 */ 770 (void)subyte(--ucp, 0); 771 for (s = next - 1; s >= path; s--) 772 (void)subyte(--ucp, *s); 773 arg0 = ucp; 774 775 /* 776 * Move out the arg pointers. 777 */ 778 uap = (char **)((intptr_t)ucp & ~(sizeof(intptr_t)-1)); 779 (void)suword((caddr_t)--uap, (long)0); /* terminator */ 780 (void)suword((caddr_t)--uap, (long)(intptr_t)arg1); 781 (void)suword((caddr_t)--uap, (long)(intptr_t)arg0); 782 783 /* 784 * Point at the arguments. 785 */ 786 args.fname = arg0; 787 args.argv = uap; 788 args.envv = NULL; 789 790 /* 791 * Now try to exec the program. If can't for any reason 792 * other than it doesn't exist, complain. 793 * 794 * Otherwise, return via fork_trampoline() all the way 795 * to user mode as init! 796 */ 797 if ((error = sys_execve(td, &args)) == 0) { 798 mtx_unlock(&Giant); 799 return; 800 } 801 if (error != ENOENT) 802 printf("exec %.*s: error %d\n", (int)(next - path), 803 path, error); 804 } 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 it's own address space. 811 * We do this early to reserve pid 1. 812 * 813 * Note special case - do not make it runnable yet. Other work 814 * in progress will change this more. 815 */ 816 static void 817 create_init(const void *udata __unused) 818 { 819 struct ucred *newcred, *oldcred; 820 int error; 821 822 error = fork1(&thread0, RFFDG | RFPROC | RFSTOPPED, 0, &initproc, 823 NULL, 0); 824 if (error) 825 panic("cannot fork init: %d\n", error); 826 KASSERT(initproc->p_pid == 1, ("create_init: initproc->p_pid != 1")); 827 /* divorce init's credentials from the kernel's */ 828 newcred = crget(); 829 PROC_LOCK(initproc); 830 initproc->p_flag |= P_SYSTEM | P_INMEM; 831 oldcred = initproc->p_ucred; 832 crcopy(newcred, oldcred); 833 #ifdef MAC 834 mac_cred_create_init(newcred); 835 #endif 836 #ifdef AUDIT 837 audit_cred_proc1(newcred); 838 #endif 839 initproc->p_ucred = newcred; 840 PROC_UNLOCK(initproc); 841 crfree(oldcred); 842 cred_update_thread(FIRST_THREAD_IN_PROC(initproc)); 843 cpu_set_fork_handler(FIRST_THREAD_IN_PROC(initproc), start_init, NULL); 844 } 845 SYSINIT(init, SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL); 846 847 /* 848 * Make it runnable now. 849 */ 850 static void 851 kick_init(const void *udata __unused) 852 { 853 struct thread *td; 854 855 td = FIRST_THREAD_IN_PROC(initproc); 856 thread_lock(td); 857 TD_SET_CAN_RUN(td); 858 sched_add(td, SRQ_BORING); 859 thread_unlock(td); 860 } 861 SYSINIT(kickinit, SI_SUB_KTHREAD_INIT, SI_ORDER_FIRST, kick_init, NULL); 862