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 for (sipp = sysinit; sipp < sysinit_end; sipp++) { 248 249 if ((*sipp)->subsystem == SI_SUB_DUMMY) 250 continue; /* skip dummy task(s)*/ 251 252 if ((*sipp)->subsystem == SI_SUB_DONE) 253 continue; 254 255 #if defined(VERBOSE_SYSINIT) 256 if ((*sipp)->subsystem > last) { 257 verbose = 1; 258 last = (*sipp)->subsystem; 259 printf("subsystem %x\n", last); 260 } 261 if (verbose) { 262 #if defined(DDB) 263 const char *func, *data; 264 265 func = symbol_name((vm_offset_t)(*sipp)->func, 266 DB_STGY_PROC); 267 data = symbol_name((vm_offset_t)(*sipp)->udata, 268 DB_STGY_ANY); 269 if (func != NULL && data != NULL) 270 printf(" %s(&%s)... ", func, data); 271 else if (func != NULL) 272 printf(" %s(%p)... ", func, (*sipp)->udata); 273 else 274 #endif 275 printf(" %p(%p)... ", (*sipp)->func, 276 (*sipp)->udata); 277 } 278 #endif 279 280 /* Call function */ 281 (*((*sipp)->func))((*sipp)->udata); 282 283 #if defined(VERBOSE_SYSINIT) 284 if (verbose) 285 printf("done.\n"); 286 #endif 287 288 /* Check off the one we're just done */ 289 (*sipp)->subsystem = SI_SUB_DONE; 290 291 /* Check if we've installed more sysinit items via KLD */ 292 if (newsysinit != NULL) { 293 if (sysinit != SET_BEGIN(sysinit_set)) 294 free(sysinit, M_TEMP); 295 sysinit = newsysinit; 296 sysinit_end = newsysinit_end; 297 newsysinit = NULL; 298 newsysinit_end = NULL; 299 goto restart; 300 } 301 } 302 303 mtx_assert(&Giant, MA_OWNED | MA_NOTRECURSED); 304 mtx_unlock(&Giant); 305 306 /* 307 * Now hand over this thread to swapper. 308 */ 309 swapper(); 310 /* NOTREACHED*/ 311 } 312 313 314 /* 315 *************************************************************************** 316 **** 317 **** The following SYSINIT's belong elsewhere, but have not yet 318 **** been moved. 319 **** 320 *************************************************************************** 321 */ 322 static void 323 print_caddr_t(void *data) 324 { 325 printf("%s", (char *)data); 326 } 327 328 static void 329 print_version(void *data __unused) 330 { 331 int len; 332 333 /* Strip a trailing newline from version. */ 334 len = strlen(version); 335 while (len > 0 && version[len - 1] == '\n') 336 len--; 337 printf("%.*s %s\n", len, version, machine); 338 printf("%s\n", compiler_version); 339 } 340 341 SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t, 342 copyright); 343 SYSINIT(trademark, SI_SUB_COPYRIGHT, SI_ORDER_SECOND, print_caddr_t, 344 trademark); 345 SYSINIT(version, SI_SUB_COPYRIGHT, SI_ORDER_THIRD, print_version, NULL); 346 347 #ifdef WITNESS 348 static char wit_warn[] = 349 "WARNING: WITNESS option enabled, expect reduced performance.\n"; 350 SYSINIT(witwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 1, 351 print_caddr_t, wit_warn); 352 SYSINIT(witwarn2, SI_SUB_LAST, SI_ORDER_THIRD + 1, 353 print_caddr_t, wit_warn); 354 #endif 355 356 #ifdef DIAGNOSTIC 357 static char diag_warn[] = 358 "WARNING: DIAGNOSTIC option enabled, expect reduced performance.\n"; 359 SYSINIT(diagwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 2, 360 print_caddr_t, diag_warn); 361 SYSINIT(diagwarn2, SI_SUB_LAST, SI_ORDER_THIRD + 2, 362 print_caddr_t, diag_warn); 363 #endif 364 365 static int 366 null_fetch_syscall_args(struct thread *td __unused, 367 struct syscall_args *sa __unused) 368 { 369 370 panic("null_fetch_syscall_args"); 371 } 372 373 static void 374 null_set_syscall_retval(struct thread *td __unused, int error __unused) 375 { 376 377 panic("null_set_syscall_retval"); 378 } 379 380 struct sysentvec null_sysvec = { 381 .sv_size = 0, 382 .sv_table = NULL, 383 .sv_mask = 0, 384 .sv_sigsize = 0, 385 .sv_sigtbl = NULL, 386 .sv_errsize = 0, 387 .sv_errtbl = NULL, 388 .sv_transtrap = NULL, 389 .sv_fixup = NULL, 390 .sv_sendsig = NULL, 391 .sv_sigcode = NULL, 392 .sv_szsigcode = NULL, 393 .sv_prepsyscall = NULL, 394 .sv_name = "null", 395 .sv_coredump = NULL, 396 .sv_imgact_try = NULL, 397 .sv_minsigstksz = 0, 398 .sv_pagesize = PAGE_SIZE, 399 .sv_minuser = VM_MIN_ADDRESS, 400 .sv_maxuser = VM_MAXUSER_ADDRESS, 401 .sv_usrstack = USRSTACK, 402 .sv_psstrings = PS_STRINGS, 403 .sv_stackprot = VM_PROT_ALL, 404 .sv_copyout_strings = NULL, 405 .sv_setregs = NULL, 406 .sv_fixlimit = NULL, 407 .sv_maxssiz = NULL, 408 .sv_flags = 0, 409 .sv_set_syscall_retval = null_set_syscall_retval, 410 .sv_fetch_syscall_args = null_fetch_syscall_args, 411 .sv_syscallnames = NULL, 412 .sv_schedtail = NULL, 413 }; 414 415 /* 416 *************************************************************************** 417 **** 418 **** The two following SYSINIT's are proc0 specific glue code. I am not 419 **** convinced that they can not be safely combined, but their order of 420 **** operation has been maintained as the same as the original init_main.c 421 **** for right now. 422 **** 423 **** These probably belong in init_proc.c or kern_proc.c, since they 424 **** deal with proc0 (the fork template process). 425 **** 426 *************************************************************************** 427 */ 428 /* ARGSUSED*/ 429 static void 430 proc0_init(void *dummy __unused) 431 { 432 struct proc *p; 433 struct thread *td; 434 vm_paddr_t pageablemem; 435 int i; 436 437 GIANT_REQUIRED; 438 p = &proc0; 439 td = &thread0; 440 441 /* 442 * Initialize magic number and osrel. 443 */ 444 p->p_magic = P_MAGIC; 445 p->p_osrel = osreldate; 446 447 /* 448 * Initialize thread and process structures. 449 */ 450 procinit(); /* set up proc zone */ 451 threadinit(); /* set up UMA zones */ 452 453 /* 454 * Initialise scheduler resources. 455 * Add scheduler specific parts to proc, thread as needed. 456 */ 457 schedinit(); /* scheduler gets its house in order */ 458 459 /* 460 * Create process 0 (the swapper). 461 */ 462 LIST_INSERT_HEAD(&allproc, p, p_list); 463 LIST_INSERT_HEAD(PIDHASH(0), p, p_hash); 464 mtx_init(&pgrp0.pg_mtx, "process group", NULL, MTX_DEF | MTX_DUPOK); 465 p->p_pgrp = &pgrp0; 466 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash); 467 LIST_INIT(&pgrp0.pg_members); 468 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist); 469 470 pgrp0.pg_session = &session0; 471 mtx_init(&session0.s_mtx, "session", NULL, MTX_DEF); 472 refcount_init(&session0.s_count, 1); 473 session0.s_leader = p; 474 475 p->p_sysent = &null_sysvec; 476 p->p_flag = P_SYSTEM | P_INMEM; 477 p->p_flag2 = 0; 478 p->p_state = PRS_NORMAL; 479 knlist_init_mtx(&p->p_klist, &p->p_mtx); 480 STAILQ_INIT(&p->p_ktr); 481 p->p_nice = NZERO; 482 /* pid_max cannot be greater than PID_MAX */ 483 td->td_tid = PID_MAX + 1; 484 LIST_INSERT_HEAD(TIDHASH(td->td_tid), td, td_hash); 485 td->td_state = TDS_RUNNING; 486 td->td_pri_class = PRI_TIMESHARE; 487 td->td_user_pri = PUSER; 488 td->td_base_user_pri = PUSER; 489 td->td_lend_user_pri = PRI_MAX; 490 td->td_priority = PVM; 491 td->td_base_pri = PVM; 492 td->td_oncpu = 0; 493 td->td_flags = TDF_INMEM; 494 td->td_pflags = TDP_KTHREAD; 495 td->td_cpuset = cpuset_thread0(); 496 prison0.pr_cpuset = cpuset_ref(td->td_cpuset); 497 p->p_peers = 0; 498 p->p_leader = p; 499 p->p_reaper = p; 500 LIST_INIT(&p->p_reaplist); 501 502 strncpy(p->p_comm, "kernel", sizeof (p->p_comm)); 503 strncpy(td->td_name, "swapper", sizeof (td->td_name)); 504 505 callout_init_mtx(&p->p_itcallout, &p->p_mtx, 0); 506 callout_init_mtx(&p->p_limco, &p->p_mtx, 0); 507 callout_init(&td->td_slpcallout, CALLOUT_MPSAFE); 508 509 /* Create credentials. */ 510 p->p_ucred = crget(); 511 p->p_ucred->cr_ngroups = 1; /* group 0 */ 512 p->p_ucred->cr_uidinfo = uifind(0); 513 p->p_ucred->cr_ruidinfo = uifind(0); 514 p->p_ucred->cr_prison = &prison0; 515 p->p_ucred->cr_loginclass = loginclass_find("default"); 516 #ifdef AUDIT 517 audit_cred_kproc0(p->p_ucred); 518 #endif 519 #ifdef MAC 520 mac_cred_create_swapper(p->p_ucred); 521 #endif 522 td->td_ucred = crhold(p->p_ucred); 523 524 /* Create sigacts. */ 525 p->p_sigacts = sigacts_alloc(); 526 527 /* Initialize signal state for process 0. */ 528 siginit(&proc0); 529 530 /* Create the file descriptor table. */ 531 p->p_fd = fdinit(NULL, false); 532 p->p_fdtol = NULL; 533 534 /* Create the limits structures. */ 535 p->p_limit = lim_alloc(); 536 for (i = 0; i < RLIM_NLIMITS; i++) 537 p->p_limit->pl_rlimit[i].rlim_cur = 538 p->p_limit->pl_rlimit[i].rlim_max = RLIM_INFINITY; 539 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_cur = 540 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles; 541 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_cur = 542 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc; 543 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_cur = dfldsiz; 544 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_max = maxdsiz; 545 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_cur = dflssiz; 546 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_max = maxssiz; 547 /* Cast to avoid overflow on i386/PAE. */ 548 pageablemem = ptoa((vm_paddr_t)vm_cnt.v_free_count); 549 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_cur = 550 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_max = pageablemem; 551 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = pageablemem / 3; 552 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_max = pageablemem; 553 p->p_cpulimit = RLIM_INFINITY; 554 555 /* Initialize resource accounting structures. */ 556 racct_create(&p->p_racct); 557 558 p->p_stats = pstats_alloc(); 559 560 /* Allocate a prototype map so we have something to fork. */ 561 pmap_pinit0(vmspace_pmap(&vmspace0)); 562 p->p_vmspace = &vmspace0; 563 vmspace0.vm_refcnt = 1; 564 565 /* 566 * proc0 is not expected to enter usermode, so there is no special 567 * handling for sv_minuser here, like is done for exec_new_vmspace(). 568 */ 569 vm_map_init(&vmspace0.vm_map, vmspace_pmap(&vmspace0), 570 p->p_sysent->sv_minuser, p->p_sysent->sv_maxuser); 571 572 /* 573 * Call the init and ctor for the new thread and proc. We wait 574 * to do this until all other structures are fairly sane. 575 */ 576 EVENTHANDLER_INVOKE(process_init, p); 577 EVENTHANDLER_INVOKE(thread_init, td); 578 EVENTHANDLER_INVOKE(process_ctor, p); 579 EVENTHANDLER_INVOKE(thread_ctor, td); 580 581 /* 582 * Charge root for one process. 583 */ 584 (void)chgproccnt(p->p_ucred->cr_ruidinfo, 1, 0); 585 PROC_LOCK(p); 586 racct_add_force(p, RACCT_NPROC, 1); 587 PROC_UNLOCK(p); 588 } 589 SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL); 590 591 /* ARGSUSED*/ 592 static void 593 proc0_post(void *dummy __unused) 594 { 595 struct timespec ts; 596 struct proc *p; 597 struct rusage ru; 598 struct thread *td; 599 600 /* 601 * Now we can look at the time, having had a chance to verify the 602 * time from the filesystem. Pretend that proc0 started now. 603 */ 604 sx_slock(&allproc_lock); 605 FOREACH_PROC_IN_SYSTEM(p) { 606 microuptime(&p->p_stats->p_start); 607 PROC_STATLOCK(p); 608 rufetch(p, &ru); /* Clears thread stats */ 609 PROC_STATUNLOCK(p); 610 p->p_rux.rux_runtime = 0; 611 p->p_rux.rux_uticks = 0; 612 p->p_rux.rux_sticks = 0; 613 p->p_rux.rux_iticks = 0; 614 FOREACH_THREAD_IN_PROC(p, td) { 615 td->td_runtime = 0; 616 } 617 } 618 sx_sunlock(&allproc_lock); 619 PCPU_SET(switchtime, cpu_ticks()); 620 PCPU_SET(switchticks, ticks); 621 622 /* 623 * Give the ``random'' number generator a thump. 624 */ 625 nanotime(&ts); 626 srandom(ts.tv_sec ^ ts.tv_nsec); 627 } 628 SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL); 629 630 static void 631 random_init(void *dummy __unused) 632 { 633 634 /* 635 * After CPU has been started we have some randomness on most 636 * platforms via get_cyclecount(). For platforms that don't 637 * we will reseed random(9) in proc0_post() as well. 638 */ 639 srandom(get_cyclecount()); 640 } 641 SYSINIT(random, SI_SUB_RANDOM, SI_ORDER_FIRST, random_init, NULL); 642 643 /* 644 *************************************************************************** 645 **** 646 **** The following SYSINIT's and glue code should be moved to the 647 **** respective files on a per subsystem basis. 648 **** 649 *************************************************************************** 650 */ 651 652 653 /* 654 *************************************************************************** 655 **** 656 **** The following code probably belongs in another file, like 657 **** kern/init_init.c. 658 **** 659 *************************************************************************** 660 */ 661 662 /* 663 * List of paths to try when searching for "init". 664 */ 665 static char init_path[MAXPATHLEN] = 666 #ifdef INIT_PATH 667 __XSTRING(INIT_PATH); 668 #else 669 "/sbin/init:/sbin/oinit:/sbin/init.bak:/rescue/init"; 670 #endif 671 SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0, 672 "Path used to search the init process"); 673 674 /* 675 * Shutdown timeout of init(8). 676 * Unused within kernel, but used to control init(8), hence do not remove. 677 */ 678 #ifndef INIT_SHUTDOWN_TIMEOUT 679 #define INIT_SHUTDOWN_TIMEOUT 120 680 #endif 681 static int init_shutdown_timeout = INIT_SHUTDOWN_TIMEOUT; 682 SYSCTL_INT(_kern, OID_AUTO, init_shutdown_timeout, 683 CTLFLAG_RW, &init_shutdown_timeout, 0, "Shutdown timeout of init(8). " 684 "Unused within kernel, but used to control init(8)"); 685 686 /* 687 * Start the initial user process; try exec'ing each pathname in init_path. 688 * The program is invoked with one argument containing the boot flags. 689 */ 690 static void 691 start_init(void *dummy) 692 { 693 vm_offset_t addr; 694 struct execve_args args; 695 int options, error; 696 char *var, *path, *next, *s; 697 char *ucp, **uap, *arg0, *arg1; 698 struct thread *td; 699 struct proc *p; 700 701 mtx_lock(&Giant); 702 703 GIANT_REQUIRED; 704 705 td = curthread; 706 p = td->td_proc; 707 708 vfs_mountroot(); 709 710 /* 711 * Need just enough stack to hold the faked-up "execve()" arguments. 712 */ 713 addr = p->p_sysent->sv_usrstack - PAGE_SIZE; 714 if (vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &addr, PAGE_SIZE, 0, 715 VMFS_NO_SPACE, VM_PROT_ALL, VM_PROT_ALL, 0) != 0) 716 panic("init: couldn't allocate argument space"); 717 p->p_vmspace->vm_maxsaddr = (caddr_t)addr; 718 p->p_vmspace->vm_ssize = 1; 719 720 if ((var = kern_getenv("init_path")) != NULL) { 721 strlcpy(init_path, var, sizeof(init_path)); 722 freeenv(var); 723 } 724 725 for (path = init_path; *path != '\0'; path = next) { 726 while (*path == ':') 727 path++; 728 if (*path == '\0') 729 break; 730 for (next = path; *next != '\0' && *next != ':'; next++) 731 /* nothing */ ; 732 if (bootverbose) 733 printf("start_init: trying %.*s\n", (int)(next - path), 734 path); 735 736 /* 737 * Move out the boot flag argument. 738 */ 739 options = 0; 740 ucp = (char *)p->p_sysent->sv_usrstack; 741 (void)subyte(--ucp, 0); /* trailing zero */ 742 if (boothowto & RB_SINGLE) { 743 (void)subyte(--ucp, 's'); 744 options = 1; 745 } 746 #ifdef notyet 747 if (boothowto & RB_FASTBOOT) { 748 (void)subyte(--ucp, 'f'); 749 options = 1; 750 } 751 #endif 752 753 #ifdef BOOTCDROM 754 (void)subyte(--ucp, 'C'); 755 options = 1; 756 #endif 757 758 if (options == 0) 759 (void)subyte(--ucp, '-'); 760 (void)subyte(--ucp, '-'); /* leading hyphen */ 761 arg1 = ucp; 762 763 /* 764 * Move out the file name (also arg 0). 765 */ 766 (void)subyte(--ucp, 0); 767 for (s = next - 1; s >= path; s--) 768 (void)subyte(--ucp, *s); 769 arg0 = ucp; 770 771 /* 772 * Move out the arg pointers. 773 */ 774 uap = (char **)((intptr_t)ucp & ~(sizeof(intptr_t)-1)); 775 (void)suword((caddr_t)--uap, (long)0); /* terminator */ 776 (void)suword((caddr_t)--uap, (long)(intptr_t)arg1); 777 (void)suword((caddr_t)--uap, (long)(intptr_t)arg0); 778 779 /* 780 * Point at the arguments. 781 */ 782 args.fname = arg0; 783 args.argv = uap; 784 args.envv = NULL; 785 786 /* 787 * Now try to exec the program. If can't for any reason 788 * other than it doesn't exist, complain. 789 * 790 * Otherwise, return via fork_trampoline() all the way 791 * to user mode as init! 792 */ 793 if ((error = sys_execve(td, &args)) == 0) { 794 mtx_unlock(&Giant); 795 return; 796 } 797 if (error != ENOENT) 798 printf("exec %.*s: error %d\n", (int)(next - path), 799 path, error); 800 } 801 printf("init: not found in path %s\n", init_path); 802 panic("no init"); 803 } 804 805 /* 806 * Like kproc_create(), but runs in it's own address space. 807 * We do this early to reserve pid 1. 808 * 809 * Note special case - do not make it runnable yet. Other work 810 * in progress will change this more. 811 */ 812 static void 813 create_init(const void *udata __unused) 814 { 815 struct ucred *newcred, *oldcred; 816 int error; 817 818 error = fork1(&thread0, RFFDG | RFPROC | RFSTOPPED, 0, &initproc, 819 NULL, 0); 820 if (error) 821 panic("cannot fork init: %d\n", error); 822 KASSERT(initproc->p_pid == 1, ("create_init: initproc->p_pid != 1")); 823 /* divorce init's credentials from the kernel's */ 824 newcred = crget(); 825 sx_xlock(&proctree_lock); 826 PROC_LOCK(initproc); 827 initproc->p_flag |= P_SYSTEM | P_INMEM; 828 initproc->p_treeflag |= P_TREE_REAPER; 829 LIST_INSERT_HEAD(&initproc->p_reaplist, &proc0, p_reapsibling); 830 oldcred = initproc->p_ucred; 831 crcopy(newcred, oldcred); 832 #ifdef MAC 833 mac_cred_create_init(newcred); 834 #endif 835 #ifdef AUDIT 836 audit_cred_proc1(newcred); 837 #endif 838 initproc->p_ucred = newcred; 839 PROC_UNLOCK(initproc); 840 sx_xunlock(&proctree_lock); 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_MIDDLE, kick_init, NULL); 862