1 /*- 2 * SPDX-License-Identifier: BSD-4-Clause 3 * 4 * Copyright (c) 1995 Terrence R. Lambert 5 * All rights reserved. 6 * 7 * Copyright (c) 1982, 1986, 1989, 1991, 1992, 1993 8 * The Regents of the University of California. All rights reserved. 9 * (c) UNIX System Laboratories, Inc. 10 * All or some portions of this file are derived from material licensed 11 * to the University of California by American Telephone and Telegraph 12 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 13 * the permission of UNIX System Laboratories, Inc. 14 * 15 * Redistribution and use in source and binary forms, with or without 16 * modification, are permitted provided that the following conditions 17 * are met: 18 * 1. Redistributions of source code must retain the above copyright 19 * notice, this list of conditions and the following disclaimer. 20 * 2. Redistributions in binary form must reproduce the above copyright 21 * notice, this list of conditions and the following disclaimer in the 22 * documentation and/or other materials provided with the distribution. 23 * 3. All advertising materials mentioning features or use of this software 24 * must display the following acknowledgement: 25 * This product includes software developed by the University of 26 * California, Berkeley and its contributors. 27 * 4. Neither the name of the University nor the names of its contributors 28 * may be used to endorse or promote products derived from this software 29 * without specific prior written permission. 30 * 31 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 32 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 33 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 34 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 35 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 39 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 40 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 41 * SUCH DAMAGE. 42 * 43 * @(#)init_main.c 8.9 (Berkeley) 1/21/94 44 */ 45 46 #include <sys/cdefs.h> 47 __FBSDID("$FreeBSD$"); 48 49 #include "opt_ddb.h" 50 #include "opt_init_path.h" 51 #include "opt_verbose_sysinit.h" 52 53 #include <sys/param.h> 54 #include <sys/kernel.h> 55 #include <sys/exec.h> 56 #include <sys/file.h> 57 #include <sys/filedesc.h> 58 #include <sys/jail.h> 59 #include <sys/ktr.h> 60 #include <sys/lock.h> 61 #include <sys/loginclass.h> 62 #include <sys/mount.h> 63 #include <sys/mutex.h> 64 #include <sys/syscallsubr.h> 65 #include <sys/sysctl.h> 66 #include <sys/proc.h> 67 #include <sys/racct.h> 68 #include <sys/resourcevar.h> 69 #include <sys/systm.h> 70 #include <sys/signalvar.h> 71 #include <sys/vnode.h> 72 #include <sys/sysent.h> 73 #include <sys/reboot.h> 74 #include <sys/sched.h> 75 #include <sys/sx.h> 76 #include <sys/sysproto.h> 77 #include <sys/vmmeter.h> 78 #include <sys/unistd.h> 79 #include <sys/malloc.h> 80 #include <sys/conf.h> 81 #include <sys/cpuset.h> 82 83 #include <machine/cpu.h> 84 85 #include <security/audit/audit.h> 86 #include <security/mac/mac_framework.h> 87 88 #include <vm/vm.h> 89 #include <vm/vm_param.h> 90 #include <vm/vm_extern.h> 91 #include <vm/pmap.h> 92 #include <vm/vm_map.h> 93 #include <sys/copyright.h> 94 95 #include <ddb/ddb.h> 96 #include <ddb/db_sym.h> 97 98 void mi_startup(void); /* Should be elsewhere */ 99 100 /* Components of the first process -- never freed. */ 101 static struct session session0; 102 static struct pgrp pgrp0; 103 struct proc proc0; 104 struct thread0_storage thread0_st __aligned(32); 105 struct vmspace vmspace0; 106 struct proc *initproc; 107 108 #ifndef BOOTHOWTO 109 #define BOOTHOWTO 0 110 #endif 111 int boothowto = BOOTHOWTO; /* initialized so that it can be patched */ 112 SYSCTL_INT(_debug, OID_AUTO, boothowto, CTLFLAG_RD, &boothowto, 0, 113 "Boot control flags, passed from loader"); 114 115 #ifndef BOOTVERBOSE 116 #define BOOTVERBOSE 0 117 #endif 118 int bootverbose = BOOTVERBOSE; 119 SYSCTL_INT(_debug, OID_AUTO, bootverbose, CTLFLAG_RW, &bootverbose, 0, 120 "Control the output of verbose kernel messages"); 121 122 #ifdef VERBOSE_SYSINIT 123 /* 124 * We'll use the defined value of VERBOSE_SYSINIT from the kernel config to 125 * dictate the default VERBOSE_SYSINIT behavior. Significant values for this 126 * option and associated tunable are: 127 * - 0, 'compiled in but silent by default' 128 * - 1, 'compiled in but verbose by default' (default) 129 */ 130 int verbose_sysinit = VERBOSE_SYSINIT; 131 TUNABLE_INT("debug.verbose_sysinit", &verbose_sysinit); 132 #endif 133 134 #ifdef INVARIANTS 135 FEATURE(invariants, "Kernel compiled with INVARIANTS, may affect performance"); 136 #endif 137 138 /* 139 * This ensures that there is at least one entry so that the sysinit_set 140 * symbol is not undefined. A sybsystem ID of SI_SUB_DUMMY is never 141 * executed. 142 */ 143 SYSINIT(placeholder, SI_SUB_DUMMY, SI_ORDER_ANY, NULL, NULL); 144 145 /* 146 * The sysinit table itself. Items are checked off as the are run. 147 * If we want to register new sysinit types, add them to newsysinit. 148 */ 149 SET_DECLARE(sysinit_set, struct sysinit); 150 struct sysinit **sysinit, **sysinit_end; 151 struct sysinit **newsysinit, **newsysinit_end; 152 153 EVENTHANDLER_LIST_DECLARE(process_init); 154 EVENTHANDLER_LIST_DECLARE(thread_init); 155 EVENTHANDLER_LIST_DECLARE(process_ctor); 156 EVENTHANDLER_LIST_DECLARE(thread_ctor); 157 158 /* 159 * Merge a new sysinit set into the current set, reallocating it if 160 * necessary. This can only be called after malloc is running. 161 */ 162 void 163 sysinit_add(struct sysinit **set, struct sysinit **set_end) 164 { 165 struct sysinit **newset; 166 struct sysinit **sipp; 167 struct sysinit **xipp; 168 int count; 169 170 count = set_end - set; 171 if (newsysinit) 172 count += newsysinit_end - newsysinit; 173 else 174 count += sysinit_end - sysinit; 175 newset = malloc(count * sizeof(*sipp), M_TEMP, M_NOWAIT); 176 if (newset == NULL) 177 panic("cannot malloc for sysinit"); 178 xipp = newset; 179 if (newsysinit) 180 for (sipp = newsysinit; sipp < newsysinit_end; sipp++) 181 *xipp++ = *sipp; 182 else 183 for (sipp = sysinit; sipp < sysinit_end; sipp++) 184 *xipp++ = *sipp; 185 for (sipp = set; sipp < set_end; sipp++) 186 *xipp++ = *sipp; 187 if (newsysinit) 188 free(newsysinit, M_TEMP); 189 newsysinit = newset; 190 newsysinit_end = newset + count; 191 } 192 193 #if defined (DDB) && defined(VERBOSE_SYSINIT) 194 static const char * 195 symbol_name(vm_offset_t va, db_strategy_t strategy) 196 { 197 const char *name; 198 c_db_sym_t sym; 199 db_expr_t offset; 200 201 if (va == 0) 202 return (NULL); 203 sym = db_search_symbol(va, strategy, &offset); 204 if (offset != 0) 205 return (NULL); 206 db_symbol_values(sym, &name, NULL); 207 return (name); 208 } 209 #endif 210 211 /* 212 * System startup; initialize the world, create process 0, mount root 213 * filesystem, and fork to create init and pagedaemon. Most of the 214 * hard work is done in the lower-level initialization routines including 215 * startup(), which does memory initialization and autoconfiguration. 216 * 217 * This allows simple addition of new kernel subsystems that require 218 * boot time initialization. It also allows substitution of subsystem 219 * (for instance, a scheduler, kernel profiler, or VM system) by object 220 * module. Finally, it allows for optional "kernel threads". 221 */ 222 void 223 mi_startup(void) 224 { 225 226 struct sysinit **sipp; /* system initialization*/ 227 struct sysinit **xipp; /* interior loop of sort*/ 228 struct sysinit *save; /* bubble*/ 229 230 #if defined(VERBOSE_SYSINIT) 231 int last; 232 int verbose; 233 #endif 234 235 TSENTER(); 236 237 if (boothowto & RB_VERBOSE) 238 bootverbose++; 239 240 if (sysinit == NULL) { 241 sysinit = SET_BEGIN(sysinit_set); 242 sysinit_end = SET_LIMIT(sysinit_set); 243 } 244 245 restart: 246 /* 247 * Perform a bubble sort of the system initialization objects by 248 * their subsystem (primary key) and order (secondary key). 249 */ 250 for (sipp = sysinit; sipp < sysinit_end; sipp++) { 251 for (xipp = sipp + 1; xipp < sysinit_end; xipp++) { 252 if ((*sipp)->subsystem < (*xipp)->subsystem || 253 ((*sipp)->subsystem == (*xipp)->subsystem && 254 (*sipp)->order <= (*xipp)->order)) 255 continue; /* skip*/ 256 save = *sipp; 257 *sipp = *xipp; 258 *xipp = save; 259 } 260 } 261 262 #if defined(VERBOSE_SYSINIT) 263 last = SI_SUB_COPYRIGHT; 264 verbose = 0; 265 #if !defined(DDB) 266 printf("VERBOSE_SYSINIT: DDB not enabled, symbol lookups disabled.\n"); 267 #endif 268 #endif 269 270 /* 271 * Traverse the (now) ordered list of system initialization tasks. 272 * Perform each task, and continue on to the next task. 273 */ 274 for (sipp = sysinit; sipp < sysinit_end; sipp++) { 275 276 if ((*sipp)->subsystem == SI_SUB_DUMMY) 277 continue; /* skip dummy task(s)*/ 278 279 if ((*sipp)->subsystem == SI_SUB_DONE) 280 continue; 281 282 #if defined(VERBOSE_SYSINIT) 283 if ((*sipp)->subsystem > last && verbose_sysinit != 0) { 284 verbose = 1; 285 last = (*sipp)->subsystem; 286 printf("subsystem %x\n", last); 287 } 288 if (verbose) { 289 #if defined(DDB) 290 const char *func, *data; 291 292 func = symbol_name((vm_offset_t)(*sipp)->func, 293 DB_STGY_PROC); 294 data = symbol_name((vm_offset_t)(*sipp)->udata, 295 DB_STGY_ANY); 296 if (func != NULL && data != NULL) 297 printf(" %s(&%s)... ", func, data); 298 else if (func != NULL) 299 printf(" %s(%p)... ", func, (*sipp)->udata); 300 else 301 #endif 302 printf(" %p(%p)... ", (*sipp)->func, 303 (*sipp)->udata); 304 } 305 #endif 306 307 /* Call function */ 308 (*((*sipp)->func))((*sipp)->udata); 309 310 #if defined(VERBOSE_SYSINIT) 311 if (verbose) 312 printf("done.\n"); 313 #endif 314 315 /* Check off the one we're just done */ 316 (*sipp)->subsystem = SI_SUB_DONE; 317 318 /* Check if we've installed more sysinit items via KLD */ 319 if (newsysinit != NULL) { 320 if (sysinit != SET_BEGIN(sysinit_set)) 321 free(sysinit, M_TEMP); 322 sysinit = newsysinit; 323 sysinit_end = newsysinit_end; 324 newsysinit = NULL; 325 newsysinit_end = NULL; 326 goto restart; 327 } 328 } 329 330 TSEXIT(); /* Here so we don't overlap with start_init. */ 331 332 mtx_assert(&Giant, MA_OWNED | MA_NOTRECURSED); 333 mtx_unlock(&Giant); 334 335 /* 336 * Now hand over this thread to swapper. 337 */ 338 swapper(); 339 /* NOTREACHED*/ 340 } 341 342 static void 343 print_caddr_t(void *data) 344 { 345 printf("%s", (char *)data); 346 } 347 348 static void 349 print_version(void *data __unused) 350 { 351 int len; 352 353 /* Strip a trailing newline from version. */ 354 len = strlen(version); 355 while (len > 0 && version[len - 1] == '\n') 356 len--; 357 printf("%.*s %s\n", len, version, machine); 358 printf("%s\n", compiler_version); 359 } 360 361 SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t, 362 copyright); 363 SYSINIT(trademark, SI_SUB_COPYRIGHT, SI_ORDER_SECOND, print_caddr_t, 364 trademark); 365 SYSINIT(version, SI_SUB_COPYRIGHT, SI_ORDER_THIRD, print_version, NULL); 366 367 #ifdef WITNESS 368 static char wit_warn[] = 369 "WARNING: WITNESS option enabled, expect reduced performance.\n"; 370 SYSINIT(witwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 1, 371 print_caddr_t, wit_warn); 372 SYSINIT(witwarn2, SI_SUB_LAST, SI_ORDER_THIRD + 1, 373 print_caddr_t, wit_warn); 374 #endif 375 376 #ifdef DIAGNOSTIC 377 static char diag_warn[] = 378 "WARNING: DIAGNOSTIC option enabled, expect reduced performance.\n"; 379 SYSINIT(diagwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 2, 380 print_caddr_t, diag_warn); 381 SYSINIT(diagwarn2, SI_SUB_LAST, SI_ORDER_THIRD + 2, 382 print_caddr_t, diag_warn); 383 #endif 384 385 static int 386 null_fetch_syscall_args(struct thread *td __unused) 387 { 388 389 panic("null_fetch_syscall_args"); 390 } 391 392 static void 393 null_set_syscall_retval(struct thread *td __unused, int error __unused) 394 { 395 396 panic("null_set_syscall_retval"); 397 } 398 399 struct sysentvec null_sysvec = { 400 .sv_size = 0, 401 .sv_table = NULL, 402 .sv_mask = 0, 403 .sv_errsize = 0, 404 .sv_errtbl = NULL, 405 .sv_transtrap = NULL, 406 .sv_fixup = NULL, 407 .sv_sendsig = NULL, 408 .sv_sigcode = NULL, 409 .sv_szsigcode = NULL, 410 .sv_name = "null", 411 .sv_coredump = NULL, 412 .sv_imgact_try = NULL, 413 .sv_minsigstksz = 0, 414 .sv_pagesize = PAGE_SIZE, 415 .sv_minuser = VM_MIN_ADDRESS, 416 .sv_maxuser = VM_MAXUSER_ADDRESS, 417 .sv_usrstack = USRSTACK, 418 .sv_psstrings = PS_STRINGS, 419 .sv_stackprot = VM_PROT_ALL, 420 .sv_copyout_strings = NULL, 421 .sv_setregs = NULL, 422 .sv_fixlimit = NULL, 423 .sv_maxssiz = NULL, 424 .sv_flags = 0, 425 .sv_set_syscall_retval = null_set_syscall_retval, 426 .sv_fetch_syscall_args = null_fetch_syscall_args, 427 .sv_syscallnames = NULL, 428 .sv_schedtail = NULL, 429 .sv_thread_detach = NULL, 430 .sv_trap = NULL, 431 }; 432 433 /* 434 * The two following SYSINIT's are proc0 specific glue code. I am not 435 * convinced that they can not be safely combined, but their order of 436 * operation has been maintained as the same as the original init_main.c 437 * for right now. 438 */ 439 /* ARGSUSED*/ 440 static void 441 proc0_init(void *dummy __unused) 442 { 443 struct proc *p; 444 struct thread *td; 445 struct ucred *newcred; 446 struct uidinfo tmpuinfo; 447 struct loginclass tmplc = { 448 .lc_name = "", 449 }; 450 vm_paddr_t pageablemem; 451 int i; 452 453 GIANT_REQUIRED; 454 p = &proc0; 455 td = &thread0; 456 457 /* 458 * Initialize magic number and osrel. 459 */ 460 p->p_magic = P_MAGIC; 461 p->p_osrel = osreldate; 462 463 /* 464 * Initialize thread and process structures. 465 */ 466 procinit(); /* set up proc zone */ 467 threadinit(); /* set up UMA zones */ 468 469 /* 470 * Initialise scheduler resources. 471 * Add scheduler specific parts to proc, thread as needed. 472 */ 473 schedinit(); /* scheduler gets its house in order */ 474 475 /* 476 * Create process 0 (the swapper). 477 */ 478 LIST_INSERT_HEAD(&allproc, p, p_list); 479 LIST_INSERT_HEAD(PIDHASH(0), p, p_hash); 480 mtx_init(&pgrp0.pg_mtx, "process group", NULL, MTX_DEF | MTX_DUPOK); 481 p->p_pgrp = &pgrp0; 482 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash); 483 LIST_INIT(&pgrp0.pg_members); 484 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist); 485 486 pgrp0.pg_session = &session0; 487 mtx_init(&session0.s_mtx, "session", NULL, MTX_DEF); 488 refcount_init(&session0.s_count, 1); 489 session0.s_leader = p; 490 491 p->p_sysent = &null_sysvec; 492 p->p_flag = P_SYSTEM | P_INMEM | P_KPROC; 493 p->p_flag2 = 0; 494 p->p_state = PRS_NORMAL; 495 p->p_klist = knlist_alloc(&p->p_mtx); 496 STAILQ_INIT(&p->p_ktr); 497 p->p_nice = NZERO; 498 /* pid_max cannot be greater than PID_MAX */ 499 td->td_tid = PID_MAX + 1; 500 LIST_INSERT_HEAD(TIDHASH(td->td_tid), td, td_hash); 501 td->td_state = TDS_RUNNING; 502 td->td_pri_class = PRI_TIMESHARE; 503 td->td_user_pri = PUSER; 504 td->td_base_user_pri = PUSER; 505 td->td_lend_user_pri = PRI_MAX; 506 td->td_priority = PVM; 507 td->td_base_pri = PVM; 508 td->td_oncpu = curcpu; 509 td->td_flags = TDF_INMEM; 510 td->td_pflags = TDP_KTHREAD; 511 td->td_cpuset = cpuset_thread0(); 512 td->td_domain.dr_policy = td->td_cpuset->cs_domain; 513 prison0_init(); 514 p->p_peers = 0; 515 p->p_leader = p; 516 p->p_reaper = p; 517 p->p_treeflag |= P_TREE_REAPER; 518 LIST_INIT(&p->p_reaplist); 519 520 strncpy(p->p_comm, "kernel", sizeof (p->p_comm)); 521 strncpy(td->td_name, "swapper", sizeof (td->td_name)); 522 523 callout_init_mtx(&p->p_itcallout, &p->p_mtx, 0); 524 callout_init_mtx(&p->p_limco, &p->p_mtx, 0); 525 callout_init(&td->td_slpcallout, 1); 526 527 /* Create credentials. */ 528 newcred = crget(); 529 newcred->cr_ngroups = 1; /* group 0 */ 530 /* A hack to prevent uifind from tripping over NULL pointers. */ 531 curthread->td_ucred = newcred; 532 tmpuinfo.ui_uid = 1; 533 newcred->cr_uidinfo = newcred->cr_ruidinfo = &tmpuinfo; 534 newcred->cr_uidinfo = uifind(0); 535 newcred->cr_ruidinfo = uifind(0); 536 newcred->cr_loginclass = &tmplc; 537 newcred->cr_loginclass = loginclass_find("default"); 538 /* End hack. creds get properly set later with thread_cow_get_proc */ 539 curthread->td_ucred = NULL; 540 newcred->cr_prison = &prison0; 541 proc_set_cred_init(p, newcred); 542 #ifdef AUDIT 543 audit_cred_kproc0(newcred); 544 #endif 545 #ifdef MAC 546 mac_cred_create_swapper(newcred); 547 #endif 548 /* Create sigacts. */ 549 p->p_sigacts = sigacts_alloc(); 550 551 /* Initialize signal state for process 0. */ 552 siginit(&proc0); 553 554 /* Create the file descriptor table. */ 555 p->p_fd = fdinit(NULL, false); 556 p->p_fdtol = NULL; 557 558 /* Create the limits structures. */ 559 p->p_limit = lim_alloc(); 560 for (i = 0; i < RLIM_NLIMITS; i++) 561 p->p_limit->pl_rlimit[i].rlim_cur = 562 p->p_limit->pl_rlimit[i].rlim_max = RLIM_INFINITY; 563 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_cur = 564 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles; 565 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_cur = 566 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc; 567 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_cur = dfldsiz; 568 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_max = maxdsiz; 569 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_cur = dflssiz; 570 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_max = maxssiz; 571 /* Cast to avoid overflow on i386/PAE. */ 572 pageablemem = ptoa((vm_paddr_t)vm_free_count()); 573 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_cur = 574 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_max = pageablemem; 575 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = pageablemem / 3; 576 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_max = pageablemem; 577 p->p_cpulimit = RLIM_INFINITY; 578 579 PROC_LOCK(p); 580 thread_cow_get_proc(td, p); 581 PROC_UNLOCK(p); 582 583 /* Initialize resource accounting structures. */ 584 racct_create(&p->p_racct); 585 586 p->p_stats = pstats_alloc(); 587 588 /* Allocate a prototype map so we have something to fork. */ 589 p->p_vmspace = &vmspace0; 590 vmspace0.vm_refcnt = 1; 591 pmap_pinit0(vmspace_pmap(&vmspace0)); 592 593 /* 594 * proc0 is not expected to enter usermode, so there is no special 595 * handling for sv_minuser here, like is done for exec_new_vmspace(). 596 */ 597 vm_map_init(&vmspace0.vm_map, vmspace_pmap(&vmspace0), 598 p->p_sysent->sv_minuser, p->p_sysent->sv_maxuser); 599 600 /* 601 * Call the init and ctor for the new thread and proc. We wait 602 * to do this until all other structures are fairly sane. 603 */ 604 EVENTHANDLER_DIRECT_INVOKE(process_init, p); 605 EVENTHANDLER_DIRECT_INVOKE(thread_init, td); 606 EVENTHANDLER_DIRECT_INVOKE(process_ctor, p); 607 EVENTHANDLER_DIRECT_INVOKE(thread_ctor, td); 608 609 /* 610 * Charge root for one process. 611 */ 612 (void)chgproccnt(p->p_ucred->cr_ruidinfo, 1, 0); 613 PROC_LOCK(p); 614 racct_add_force(p, RACCT_NPROC, 1); 615 PROC_UNLOCK(p); 616 } 617 SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL); 618 619 /* ARGSUSED*/ 620 static void 621 proc0_post(void *dummy __unused) 622 { 623 struct timespec ts; 624 struct proc *p; 625 struct rusage ru; 626 struct thread *td; 627 628 /* 629 * Now we can look at the time, having had a chance to verify the 630 * time from the filesystem. Pretend that proc0 started now. 631 */ 632 sx_slock(&allproc_lock); 633 FOREACH_PROC_IN_SYSTEM(p) { 634 PROC_LOCK(p); 635 if (p->p_state == PRS_NEW) { 636 PROC_UNLOCK(p); 637 continue; 638 } 639 microuptime(&p->p_stats->p_start); 640 PROC_STATLOCK(p); 641 rufetch(p, &ru); /* Clears thread stats */ 642 p->p_rux.rux_runtime = 0; 643 p->p_rux.rux_uticks = 0; 644 p->p_rux.rux_sticks = 0; 645 p->p_rux.rux_iticks = 0; 646 PROC_STATUNLOCK(p); 647 FOREACH_THREAD_IN_PROC(p, td) { 648 td->td_runtime = 0; 649 } 650 PROC_UNLOCK(p); 651 } 652 sx_sunlock(&allproc_lock); 653 PCPU_SET(switchtime, cpu_ticks()); 654 PCPU_SET(switchticks, ticks); 655 656 /* 657 * Give the ``random'' number generator a thump. 658 */ 659 nanotime(&ts); 660 srandom(ts.tv_sec ^ ts.tv_nsec); 661 } 662 SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL); 663 664 static void 665 random_init(void *dummy __unused) 666 { 667 668 /* 669 * After CPU has been started we have some randomness on most 670 * platforms via get_cyclecount(). For platforms that don't 671 * we will reseed random(9) in proc0_post() as well. 672 */ 673 srandom(get_cyclecount()); 674 } 675 SYSINIT(random, SI_SUB_RANDOM, SI_ORDER_FIRST, random_init, NULL); 676 677 /* 678 *************************************************************************** 679 **** 680 **** The following SYSINIT's and glue code should be moved to the 681 **** respective files on a per subsystem basis. 682 **** 683 *************************************************************************** 684 */ 685 686 /* 687 * List of paths to try when searching for "init". 688 */ 689 static char init_path[MAXPATHLEN] = 690 #ifdef INIT_PATH 691 __XSTRING(INIT_PATH); 692 #else 693 "/sbin/init:/sbin/oinit:/sbin/init.bak:/rescue/init"; 694 #endif 695 SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0, 696 "Path used to search the init process"); 697 698 /* 699 * Shutdown timeout of init(8). 700 * Unused within kernel, but used to control init(8), hence do not remove. 701 */ 702 #ifndef INIT_SHUTDOWN_TIMEOUT 703 #define INIT_SHUTDOWN_TIMEOUT 120 704 #endif 705 static int init_shutdown_timeout = INIT_SHUTDOWN_TIMEOUT; 706 SYSCTL_INT(_kern, OID_AUTO, init_shutdown_timeout, 707 CTLFLAG_RW, &init_shutdown_timeout, 0, "Shutdown timeout of init(8). " 708 "Unused within kernel, but used to control init(8)"); 709 710 /* 711 * Start the initial user process; try exec'ing each pathname in init_path. 712 * The program is invoked with one argument containing the boot flags. 713 */ 714 static void 715 start_init(void *dummy) 716 { 717 vm_offset_t addr; 718 struct execve_args args; 719 int options, error; 720 size_t pathlen; 721 char *var, *path; 722 char *free_init_path, *tmp_init_path; 723 char *ucp, **uap, *arg0, *arg1; 724 struct thread *td; 725 struct proc *p; 726 727 TSENTER(); /* Here so we don't overlap with mi_startup. */ 728 729 td = curthread; 730 p = td->td_proc; 731 732 vfs_mountroot(); 733 734 /* Wipe GELI passphrase from the environment. */ 735 kern_unsetenv("kern.geom.eli.passphrase"); 736 737 /* 738 * Need just enough stack to hold the faked-up "execve()" arguments. 739 */ 740 addr = p->p_sysent->sv_usrstack - PAGE_SIZE; 741 if (vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &addr, PAGE_SIZE, 0, 742 VMFS_NO_SPACE, VM_PROT_ALL, VM_PROT_ALL, 0) != 0) 743 panic("init: couldn't allocate argument space"); 744 p->p_vmspace->vm_maxsaddr = (caddr_t)addr; 745 p->p_vmspace->vm_ssize = 1; 746 747 if ((var = kern_getenv("init_path")) != NULL) { 748 strlcpy(init_path, var, sizeof(init_path)); 749 freeenv(var); 750 } 751 free_init_path = tmp_init_path = strdup(init_path, M_TEMP); 752 753 while ((path = strsep(&tmp_init_path, ":")) != NULL) { 754 pathlen = strlen(path) + 1; 755 if (bootverbose) 756 printf("start_init: trying %s\n", path); 757 758 /* 759 * Move out the boot flag argument. 760 */ 761 options = 0; 762 ucp = (char *)p->p_sysent->sv_usrstack; 763 (void)subyte(--ucp, 0); /* trailing zero */ 764 if (boothowto & RB_SINGLE) { 765 (void)subyte(--ucp, 's'); 766 options = 1; 767 } 768 #ifdef notyet 769 if (boothowto & RB_FASTBOOT) { 770 (void)subyte(--ucp, 'f'); 771 options = 1; 772 } 773 #endif 774 775 #ifdef BOOTCDROM 776 (void)subyte(--ucp, 'C'); 777 options = 1; 778 #endif 779 780 if (options == 0) 781 (void)subyte(--ucp, '-'); 782 (void)subyte(--ucp, '-'); /* leading hyphen */ 783 arg1 = ucp; 784 785 /* 786 * Move out the file name (also arg 0). 787 */ 788 ucp -= pathlen; 789 copyout(path, ucp, pathlen); 790 arg0 = ucp; 791 792 /* 793 * Move out the arg pointers. 794 */ 795 uap = (char **)rounddown2((intptr_t)ucp, sizeof(intptr_t)); 796 (void)suword((caddr_t)--uap, (long)0); /* terminator */ 797 (void)suword((caddr_t)--uap, (long)(intptr_t)arg1); 798 (void)suword((caddr_t)--uap, (long)(intptr_t)arg0); 799 800 /* 801 * Point at the arguments. 802 */ 803 args.fname = arg0; 804 args.argv = uap; 805 args.envv = NULL; 806 807 /* 808 * Now try to exec the program. If can't for any reason 809 * other than it doesn't exist, complain. 810 * 811 * Otherwise, return via fork_trampoline() all the way 812 * to user mode as init! 813 */ 814 if ((error = sys_execve(td, &args)) == EJUSTRETURN) { 815 free(free_init_path, M_TEMP); 816 TSEXIT(); 817 return; 818 } 819 if (error != ENOENT) 820 printf("exec %s: error %d\n", path, error); 821 } 822 free(free_init_path, M_TEMP); 823 printf("init: not found in path %s\n", init_path); 824 panic("no init"); 825 } 826 827 /* 828 * Like kproc_create(), but runs in its own address space. 829 * We do this early to reserve pid 1. 830 * 831 * Note special case - do not make it runnable yet. Other work 832 * in progress will change this more. 833 */ 834 static void 835 create_init(const void *udata __unused) 836 { 837 struct fork_req fr; 838 struct ucred *newcred, *oldcred; 839 struct thread *td; 840 int error; 841 842 bzero(&fr, sizeof(fr)); 843 fr.fr_flags = RFFDG | RFPROC | RFSTOPPED; 844 fr.fr_procp = &initproc; 845 error = fork1(&thread0, &fr); 846 if (error) 847 panic("cannot fork init: %d\n", error); 848 KASSERT(initproc->p_pid == 1, ("create_init: initproc->p_pid != 1")); 849 /* divorce init's credentials from the kernel's */ 850 newcred = crget(); 851 sx_xlock(&proctree_lock); 852 PROC_LOCK(initproc); 853 initproc->p_flag |= P_SYSTEM | P_INMEM; 854 initproc->p_treeflag |= P_TREE_REAPER; 855 oldcred = initproc->p_ucred; 856 crcopy(newcred, oldcred); 857 #ifdef MAC 858 mac_cred_create_init(newcred); 859 #endif 860 #ifdef AUDIT 861 audit_cred_proc1(newcred); 862 #endif 863 proc_set_cred(initproc, newcred); 864 td = FIRST_THREAD_IN_PROC(initproc); 865 crfree(td->td_ucred); 866 td->td_ucred = crhold(initproc->p_ucred); 867 PROC_UNLOCK(initproc); 868 sx_xunlock(&proctree_lock); 869 crfree(oldcred); 870 cpu_fork_kthread_handler(FIRST_THREAD_IN_PROC(initproc), 871 start_init, NULL); 872 } 873 SYSINIT(init, SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL); 874 875 /* 876 * Make it runnable now. 877 */ 878 static void 879 kick_init(const void *udata __unused) 880 { 881 struct thread *td; 882 883 td = FIRST_THREAD_IN_PROC(initproc); 884 thread_lock(td); 885 TD_SET_CAN_RUN(td); 886 sched_add(td, SRQ_BORING); 887 thread_unlock(td); 888 } 889 SYSINIT(kickinit, SI_SUB_KTHREAD_INIT, SI_ORDER_MIDDLE, kick_init, NULL); 890