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/epoch.h> 56 #include <sys/eventhandler.h> 57 #include <sys/exec.h> 58 #include <sys/file.h> 59 #include <sys/filedesc.h> 60 #include <sys/imgact.h> 61 #include <sys/jail.h> 62 #include <sys/ktr.h> 63 #include <sys/lock.h> 64 #include <sys/loginclass.h> 65 #include <sys/mount.h> 66 #include <sys/mutex.h> 67 #include <sys/syscallsubr.h> 68 #include <sys/sysctl.h> 69 #include <sys/proc.h> 70 #include <sys/racct.h> 71 #include <sys/resourcevar.h> 72 #include <sys/systm.h> 73 #include <sys/signalvar.h> 74 #include <sys/vnode.h> 75 #include <sys/sysent.h> 76 #include <sys/reboot.h> 77 #include <sys/sched.h> 78 #include <sys/sx.h> 79 #include <sys/sysproto.h> 80 #include <sys/vmmeter.h> 81 #include <sys/unistd.h> 82 #include <sys/malloc.h> 83 #include <sys/conf.h> 84 #include <sys/cpuset.h> 85 86 #include <machine/cpu.h> 87 88 #include <security/audit/audit.h> 89 #include <security/mac/mac_framework.h> 90 91 #include <vm/vm.h> 92 #include <vm/vm_param.h> 93 #include <vm/vm_extern.h> 94 #include <vm/pmap.h> 95 #include <vm/vm_map.h> 96 #include <sys/copyright.h> 97 98 #include <ddb/ddb.h> 99 #include <ddb/db_sym.h> 100 101 void mi_startup(void); /* Should be elsewhere */ 102 103 /* Components of the first process -- never freed. */ 104 static struct session session0; 105 static struct pgrp pgrp0; 106 struct proc proc0; 107 struct thread0_storage thread0_st __aligned(32); 108 struct vmspace vmspace0; 109 struct proc *initproc; 110 111 int 112 linux_alloc_current_noop(struct thread *td __unused, int flags __unused) 113 { 114 return (0); 115 } 116 int (*lkpi_alloc_current)(struct thread *, int) = linux_alloc_current_noop; 117 118 #ifndef BOOTHOWTO 119 #define BOOTHOWTO 0 120 #endif 121 int boothowto = BOOTHOWTO; /* initialized so that it can be patched */ 122 SYSCTL_INT(_debug, OID_AUTO, boothowto, CTLFLAG_RD, &boothowto, 0, 123 "Boot control flags, passed from loader"); 124 125 #ifndef BOOTVERBOSE 126 #define BOOTVERBOSE 0 127 #endif 128 int bootverbose = BOOTVERBOSE; 129 SYSCTL_INT(_debug, OID_AUTO, bootverbose, CTLFLAG_RW, &bootverbose, 0, 130 "Control the output of verbose kernel messages"); 131 132 #ifdef VERBOSE_SYSINIT 133 /* 134 * We'll use the defined value of VERBOSE_SYSINIT from the kernel config to 135 * dictate the default VERBOSE_SYSINIT behavior. Significant values for this 136 * option and associated tunable are: 137 * - 0, 'compiled in but silent by default' 138 * - 1, 'compiled in but verbose by default' (default) 139 */ 140 int verbose_sysinit = VERBOSE_SYSINIT; 141 TUNABLE_INT("debug.verbose_sysinit", &verbose_sysinit); 142 #endif 143 144 #ifdef INVARIANTS 145 FEATURE(invariants, "Kernel compiled with INVARIANTS, may affect performance"); 146 #endif 147 148 /* 149 * This ensures that there is at least one entry so that the sysinit_set 150 * symbol is not undefined. A sybsystem ID of SI_SUB_DUMMY is never 151 * executed. 152 */ 153 SYSINIT(placeholder, SI_SUB_DUMMY, SI_ORDER_ANY, NULL, NULL); 154 155 /* 156 * The sysinit table itself. Items are checked off as the are run. 157 * If we want to register new sysinit types, add them to newsysinit. 158 */ 159 SET_DECLARE(sysinit_set, struct sysinit); 160 struct sysinit **sysinit, **sysinit_end; 161 struct sysinit **newsysinit, **newsysinit_end; 162 163 /* 164 * Merge a new sysinit set into the current set, reallocating it if 165 * necessary. This can only be called after malloc is running. 166 */ 167 void 168 sysinit_add(struct sysinit **set, struct sysinit **set_end) 169 { 170 struct sysinit **newset; 171 struct sysinit **sipp; 172 struct sysinit **xipp; 173 int count; 174 175 count = set_end - set; 176 if (newsysinit) 177 count += newsysinit_end - newsysinit; 178 else 179 count += sysinit_end - sysinit; 180 newset = malloc(count * sizeof(*sipp), M_TEMP, M_NOWAIT); 181 if (newset == NULL) 182 panic("cannot malloc for sysinit"); 183 xipp = newset; 184 if (newsysinit) 185 for (sipp = newsysinit; sipp < newsysinit_end; sipp++) 186 *xipp++ = *sipp; 187 else 188 for (sipp = sysinit; sipp < sysinit_end; sipp++) 189 *xipp++ = *sipp; 190 for (sipp = set; sipp < set_end; sipp++) 191 *xipp++ = *sipp; 192 if (newsysinit) 193 free(newsysinit, M_TEMP); 194 newsysinit = newset; 195 newsysinit_end = newset + count; 196 } 197 198 #if defined (DDB) && defined(VERBOSE_SYSINIT) 199 static const char * 200 symbol_name(vm_offset_t va, db_strategy_t strategy) 201 { 202 const char *name; 203 c_db_sym_t sym; 204 db_expr_t offset; 205 206 if (va == 0) 207 return (NULL); 208 sym = db_search_symbol(va, strategy, &offset); 209 if (offset != 0) 210 return (NULL); 211 db_symbol_values(sym, &name, NULL); 212 return (name); 213 } 214 #endif 215 216 /* 217 * System startup; initialize the world, create process 0, mount root 218 * filesystem, and fork to create init and pagedaemon. Most of the 219 * hard work is done in the lower-level initialization routines including 220 * startup(), which does memory initialization and autoconfiguration. 221 * 222 * This allows simple addition of new kernel subsystems that require 223 * boot time initialization. It also allows substitution of subsystem 224 * (for instance, a scheduler, kernel profiler, or VM system) by object 225 * module. Finally, it allows for optional "kernel threads". 226 */ 227 void 228 mi_startup(void) 229 { 230 231 struct sysinit **sipp; /* system initialization*/ 232 struct sysinit **xipp; /* interior loop of sort*/ 233 struct sysinit *save; /* bubble*/ 234 235 #if defined(VERBOSE_SYSINIT) 236 int last; 237 int verbose; 238 #endif 239 240 TSENTER(); 241 242 if (boothowto & RB_VERBOSE) 243 bootverbose++; 244 245 if (sysinit == NULL) { 246 sysinit = SET_BEGIN(sysinit_set); 247 sysinit_end = SET_LIMIT(sysinit_set); 248 } 249 250 restart: 251 /* 252 * Perform a bubble sort of the system initialization objects by 253 * their subsystem (primary key) and order (secondary key). 254 */ 255 for (sipp = sysinit; sipp < sysinit_end; sipp++) { 256 for (xipp = sipp + 1; xipp < sysinit_end; xipp++) { 257 if ((*sipp)->subsystem < (*xipp)->subsystem || 258 ((*sipp)->subsystem == (*xipp)->subsystem && 259 (*sipp)->order <= (*xipp)->order)) 260 continue; /* skip*/ 261 save = *sipp; 262 *sipp = *xipp; 263 *xipp = save; 264 } 265 } 266 267 #if defined(VERBOSE_SYSINIT) 268 last = SI_SUB_COPYRIGHT; 269 verbose = 0; 270 #if !defined(DDB) 271 printf("VERBOSE_SYSINIT: DDB not enabled, symbol lookups disabled.\n"); 272 #endif 273 #endif 274 275 /* 276 * Traverse the (now) ordered list of system initialization tasks. 277 * Perform each task, and continue on to the next task. 278 */ 279 for (sipp = sysinit; sipp < sysinit_end; sipp++) { 280 if ((*sipp)->subsystem == SI_SUB_DUMMY) 281 continue; /* skip dummy task(s)*/ 282 283 if ((*sipp)->subsystem == SI_SUB_DONE) 284 continue; 285 286 #if defined(VERBOSE_SYSINIT) 287 if ((*sipp)->subsystem > last && verbose_sysinit != 0) { 288 verbose = 1; 289 last = (*sipp)->subsystem; 290 printf("subsystem %x\n", last); 291 } 292 if (verbose) { 293 #if defined(DDB) 294 const char *func, *data; 295 296 func = symbol_name((vm_offset_t)(*sipp)->func, 297 DB_STGY_PROC); 298 data = symbol_name((vm_offset_t)(*sipp)->udata, 299 DB_STGY_ANY); 300 if (func != NULL && data != NULL) 301 printf(" %s(&%s)... ", func, data); 302 else if (func != NULL) 303 printf(" %s(%p)... ", func, (*sipp)->udata); 304 else 305 #endif 306 printf(" %p(%p)... ", (*sipp)->func, 307 (*sipp)->udata); 308 } 309 #endif 310 311 /* Call function */ 312 (*((*sipp)->func))((*sipp)->udata); 313 314 #if defined(VERBOSE_SYSINIT) 315 if (verbose) 316 printf("done.\n"); 317 #endif 318 319 /* Check off the one we're just done */ 320 (*sipp)->subsystem = SI_SUB_DONE; 321 322 /* Check if we've installed more sysinit items via KLD */ 323 if (newsysinit != NULL) { 324 if (sysinit != SET_BEGIN(sysinit_set)) 325 free(sysinit, M_TEMP); 326 sysinit = newsysinit; 327 sysinit_end = newsysinit_end; 328 newsysinit = NULL; 329 newsysinit_end = NULL; 330 goto restart; 331 } 332 } 333 334 TSEXIT(); /* Here so we don't overlap with start_init. */ 335 336 mtx_assert(&Giant, MA_OWNED | MA_NOTRECURSED); 337 mtx_unlock(&Giant); 338 339 /* 340 * Now hand over this thread to swapper. 341 */ 342 swapper(); 343 /* NOTREACHED*/ 344 } 345 346 static void 347 print_caddr_t(void *data) 348 { 349 printf("%s", (char *)data); 350 } 351 352 static void 353 print_version(void *data __unused) 354 { 355 int len; 356 357 /* Strip a trailing newline from version. */ 358 len = strlen(version); 359 while (len > 0 && version[len - 1] == '\n') 360 len--; 361 printf("%.*s %s\n", len, version, machine); 362 printf("%s\n", compiler_version); 363 } 364 365 SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t, 366 copyright); 367 SYSINIT(trademark, SI_SUB_COPYRIGHT, SI_ORDER_SECOND, print_caddr_t, 368 trademark); 369 SYSINIT(version, SI_SUB_COPYRIGHT, SI_ORDER_THIRD, print_version, NULL); 370 371 #ifdef WITNESS 372 static char wit_warn[] = 373 "WARNING: WITNESS option enabled, expect reduced performance.\n"; 374 SYSINIT(witwarn, SI_SUB_COPYRIGHT, SI_ORDER_FOURTH, 375 print_caddr_t, wit_warn); 376 SYSINIT(witwarn2, SI_SUB_LAST, SI_ORDER_FOURTH, 377 print_caddr_t, wit_warn); 378 #endif 379 380 #ifdef DIAGNOSTIC 381 static char diag_warn[] = 382 "WARNING: DIAGNOSTIC option enabled, expect reduced performance.\n"; 383 SYSINIT(diagwarn, SI_SUB_COPYRIGHT, SI_ORDER_FIFTH, 384 print_caddr_t, diag_warn); 385 SYSINIT(diagwarn2, SI_SUB_LAST, SI_ORDER_FIFTH, 386 print_caddr_t, diag_warn); 387 #endif 388 389 static int 390 null_fetch_syscall_args(struct thread *td __unused) 391 { 392 393 panic("null_fetch_syscall_args"); 394 } 395 396 static void 397 null_set_syscall_retval(struct thread *td __unused, int error __unused) 398 { 399 400 panic("null_set_syscall_retval"); 401 } 402 403 struct sysentvec null_sysvec = { 404 .sv_size = 0, 405 .sv_table = NULL, 406 .sv_transtrap = NULL, 407 .sv_fixup = NULL, 408 .sv_sendsig = NULL, 409 .sv_sigcode = NULL, 410 .sv_szsigcode = NULL, 411 .sv_name = "null", 412 .sv_coredump = NULL, 413 .sv_imgact_try = NULL, 414 .sv_minsigstksz = 0, 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 newcred->cr_users++; /* avoid assertion failure */ 542 proc_set_cred_init(p, newcred); 543 newcred->cr_users--; 544 crfree(newcred); 545 #ifdef AUDIT 546 audit_cred_kproc0(newcred); 547 #endif 548 #ifdef MAC 549 mac_cred_create_swapper(newcred); 550 #endif 551 /* Create sigacts. */ 552 p->p_sigacts = sigacts_alloc(); 553 554 /* Initialize signal state for process 0. */ 555 siginit(&proc0); 556 557 /* Create the file descriptor table. */ 558 p->p_fd = fdinit(NULL, false, NULL); 559 p->p_fdtol = NULL; 560 561 /* Create the limits structures. */ 562 p->p_limit = lim_alloc(); 563 for (i = 0; i < RLIM_NLIMITS; i++) 564 p->p_limit->pl_rlimit[i].rlim_cur = 565 p->p_limit->pl_rlimit[i].rlim_max = RLIM_INFINITY; 566 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_cur = 567 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles; 568 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_cur = 569 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc; 570 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_cur = dfldsiz; 571 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_max = maxdsiz; 572 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_cur = dflssiz; 573 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_max = maxssiz; 574 /* Cast to avoid overflow on i386/PAE. */ 575 pageablemem = ptoa((vm_paddr_t)vm_free_count()); 576 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_cur = 577 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_max = pageablemem; 578 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = pageablemem / 3; 579 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_max = pageablemem; 580 p->p_cpulimit = RLIM_INFINITY; 581 582 PROC_LOCK(p); 583 thread_cow_get_proc(td, p); 584 PROC_UNLOCK(p); 585 586 /* Initialize resource accounting structures. */ 587 racct_create(&p->p_racct); 588 589 p->p_stats = pstats_alloc(); 590 591 /* Allocate a prototype map so we have something to fork. */ 592 p->p_vmspace = &vmspace0; 593 vmspace0.vm_refcnt = 1; 594 pmap_pinit0(vmspace_pmap(&vmspace0)); 595 596 /* 597 * proc0 is not expected to enter usermode, so there is no special 598 * handling for sv_minuser here, like is done for exec_new_vmspace(). 599 */ 600 vm_map_init(&vmspace0.vm_map, vmspace_pmap(&vmspace0), 601 p->p_sysent->sv_minuser, p->p_sysent->sv_maxuser); 602 603 /* 604 * Call the init and ctor for the new thread and proc. We wait 605 * to do this until all other structures are fairly sane. 606 */ 607 EVENTHANDLER_DIRECT_INVOKE(process_init, p); 608 EVENTHANDLER_DIRECT_INVOKE(thread_init, td); 609 EVENTHANDLER_DIRECT_INVOKE(process_ctor, p); 610 EVENTHANDLER_DIRECT_INVOKE(thread_ctor, td); 611 612 /* 613 * Charge root for one process. 614 */ 615 (void)chgproccnt(p->p_ucred->cr_ruidinfo, 1, 0); 616 PROC_LOCK(p); 617 racct_add_force(p, RACCT_NPROC, 1); 618 PROC_UNLOCK(p); 619 } 620 SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL); 621 622 /* ARGSUSED*/ 623 static void 624 proc0_post(void *dummy __unused) 625 { 626 struct proc *p; 627 struct rusage ru; 628 struct thread *td; 629 630 /* 631 * Now we can look at the time, having had a chance to verify the 632 * time from the filesystem. Pretend that proc0 started now. 633 */ 634 sx_slock(&allproc_lock); 635 FOREACH_PROC_IN_SYSTEM(p) { 636 PROC_LOCK(p); 637 if (p->p_state == PRS_NEW) { 638 PROC_UNLOCK(p); 639 continue; 640 } 641 microuptime(&p->p_stats->p_start); 642 PROC_STATLOCK(p); 643 rufetch(p, &ru); /* Clears thread stats */ 644 p->p_rux.rux_runtime = 0; 645 p->p_rux.rux_uticks = 0; 646 p->p_rux.rux_sticks = 0; 647 p->p_rux.rux_iticks = 0; 648 PROC_STATUNLOCK(p); 649 FOREACH_THREAD_IN_PROC(p, td) { 650 td->td_runtime = 0; 651 } 652 PROC_UNLOCK(p); 653 } 654 sx_sunlock(&allproc_lock); 655 PCPU_SET(switchtime, cpu_ticks()); 656 PCPU_SET(switchticks, ticks); 657 } 658 SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL); 659 660 /* 661 *************************************************************************** 662 **** 663 **** The following SYSINIT's and glue code should be moved to the 664 **** respective files on a per subsystem basis. 665 **** 666 *************************************************************************** 667 */ 668 669 /* 670 * List of paths to try when searching for "init". 671 */ 672 static char init_path[MAXPATHLEN] = 673 #ifdef INIT_PATH 674 __XSTRING(INIT_PATH); 675 #else 676 "/sbin/init:/sbin/oinit:/sbin/init.bak:/rescue/init"; 677 #endif 678 SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0, 679 "Path used to search the init process"); 680 681 /* 682 * Shutdown timeout of init(8). 683 * Unused within kernel, but used to control init(8), hence do not remove. 684 */ 685 #ifndef INIT_SHUTDOWN_TIMEOUT 686 #define INIT_SHUTDOWN_TIMEOUT 120 687 #endif 688 static int init_shutdown_timeout = INIT_SHUTDOWN_TIMEOUT; 689 SYSCTL_INT(_kern, OID_AUTO, init_shutdown_timeout, 690 CTLFLAG_RW, &init_shutdown_timeout, 0, "Shutdown timeout of init(8). " 691 "Unused within kernel, but used to control init(8)"); 692 693 /* 694 * Start the initial user process; try exec'ing each pathname in init_path. 695 * The program is invoked with one argument containing the boot flags. 696 */ 697 static void 698 start_init(void *dummy) 699 { 700 struct image_args args; 701 int error; 702 char *var, *path; 703 char *free_init_path, *tmp_init_path; 704 struct thread *td; 705 struct proc *p; 706 struct vmspace *oldvmspace; 707 708 TSENTER(); /* Here so we don't overlap with mi_startup. */ 709 710 td = curthread; 711 p = td->td_proc; 712 713 vfs_mountroot(); 714 715 /* Wipe GELI passphrase from the environment. */ 716 kern_unsetenv("kern.geom.eli.passphrase"); 717 718 if ((var = kern_getenv("init_path")) != NULL) { 719 strlcpy(init_path, var, sizeof(init_path)); 720 freeenv(var); 721 } 722 free_init_path = tmp_init_path = strdup(init_path, M_TEMP); 723 724 while ((path = strsep(&tmp_init_path, ":")) != NULL) { 725 if (bootverbose) 726 printf("start_init: trying %s\n", path); 727 728 memset(&args, 0, sizeof(args)); 729 error = exec_alloc_args(&args); 730 if (error != 0) 731 panic("%s: Can't allocate space for init arguments %d", 732 __func__, error); 733 734 error = exec_args_add_fname(&args, path, UIO_SYSSPACE); 735 if (error != 0) 736 panic("%s: Can't add fname %d", __func__, error); 737 error = exec_args_add_arg(&args, path, UIO_SYSSPACE); 738 if (error != 0) 739 panic("%s: Can't add argv[0] %d", __func__, error); 740 if (boothowto & RB_SINGLE) 741 error = exec_args_add_arg(&args, "-s", UIO_SYSSPACE); 742 if (error != 0) 743 panic("%s: Can't add argv[0] %d", __func__, error); 744 745 /* 746 * Now try to exec the program. If can't for any reason 747 * other than it doesn't exist, complain. 748 * 749 * Otherwise, return via fork_trampoline() all the way 750 * to user mode as init! 751 */ 752 KASSERT((td->td_pflags & TDP_EXECVMSPC) == 0, 753 ("nested execve")); 754 oldvmspace = td->td_proc->p_vmspace; 755 error = kern_execve(td, &args, NULL); 756 KASSERT(error != 0, 757 ("kern_execve returned success, not EJUSTRETURN")); 758 if (error == EJUSTRETURN) { 759 if ((td->td_pflags & TDP_EXECVMSPC) != 0) { 760 KASSERT(p->p_vmspace != oldvmspace, 761 ("oldvmspace still used")); 762 vmspace_free(oldvmspace); 763 td->td_pflags &= ~TDP_EXECVMSPC; 764 } 765 free(free_init_path, M_TEMP); 766 TSEXIT(); 767 return; 768 } 769 if (error != ENOENT) 770 printf("exec %s: error %d\n", path, error); 771 } 772 free(free_init_path, M_TEMP); 773 printf("init: not found in path %s\n", init_path); 774 panic("no init"); 775 } 776 777 /* 778 * Like kproc_create(), but runs in its own address space. We do this 779 * early to reserve pid 1. Note special case - do not make it 780 * runnable yet, init execution is started when userspace can be served. 781 */ 782 static void 783 create_init(const void *udata __unused) 784 { 785 struct fork_req fr; 786 struct ucred *newcred, *oldcred; 787 struct thread *td; 788 int error; 789 790 bzero(&fr, sizeof(fr)); 791 fr.fr_flags = RFFDG | RFPROC | RFSTOPPED; 792 fr.fr_procp = &initproc; 793 error = fork1(&thread0, &fr); 794 if (error) 795 panic("cannot fork init: %d\n", error); 796 KASSERT(initproc->p_pid == 1, ("create_init: initproc->p_pid != 1")); 797 /* divorce init's credentials from the kernel's */ 798 newcred = crget(); 799 sx_xlock(&proctree_lock); 800 PROC_LOCK(initproc); 801 initproc->p_flag |= P_SYSTEM | P_INMEM; 802 initproc->p_treeflag |= P_TREE_REAPER; 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 proc_set_cred(initproc, newcred); 812 td = FIRST_THREAD_IN_PROC(initproc); 813 crcowfree(td); 814 td->td_realucred = crcowget(initproc->p_ucred); 815 td->td_ucred = td->td_realucred; 816 PROC_UNLOCK(initproc); 817 sx_xunlock(&proctree_lock); 818 crfree(oldcred); 819 cpu_fork_kthread_handler(FIRST_THREAD_IN_PROC(initproc), 820 start_init, NULL); 821 } 822 SYSINIT(init, SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL); 823 824 /* 825 * Make it runnable now. 826 */ 827 static void 828 kick_init(const void *udata __unused) 829 { 830 struct thread *td; 831 832 td = FIRST_THREAD_IN_PROC(initproc); 833 thread_lock(td); 834 TD_SET_CAN_RUN(td); 835 sched_add(td, SRQ_BORING); 836 } 837 SYSINIT(kickinit, SI_SUB_KTHREAD_INIT, SI_ORDER_MIDDLE, kick_init, NULL); 838