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; 117 118 119 #ifndef BOOTHOWTO 120 #define BOOTHOWTO 0 121 #endif 122 int boothowto = BOOTHOWTO; /* initialized so that it can be patched */ 123 SYSCTL_INT(_debug, OID_AUTO, boothowto, CTLFLAG_RD, &boothowto, 0, 124 "Boot control flags, passed from loader"); 125 126 #ifndef BOOTVERBOSE 127 #define BOOTVERBOSE 0 128 #endif 129 int bootverbose = BOOTVERBOSE; 130 SYSCTL_INT(_debug, OID_AUTO, bootverbose, CTLFLAG_RW, &bootverbose, 0, 131 "Control the output of verbose kernel messages"); 132 133 #ifdef VERBOSE_SYSINIT 134 /* 135 * We'll use the defined value of VERBOSE_SYSINIT from the kernel config to 136 * dictate the default VERBOSE_SYSINIT behavior. Significant values for this 137 * option and associated tunable are: 138 * - 0, 'compiled in but silent by default' 139 * - 1, 'compiled in but verbose by default' (default) 140 */ 141 int verbose_sysinit = VERBOSE_SYSINIT; 142 TUNABLE_INT("debug.verbose_sysinit", &verbose_sysinit); 143 #endif 144 145 #ifdef INVARIANTS 146 FEATURE(invariants, "Kernel compiled with INVARIANTS, may affect performance"); 147 #endif 148 149 /* 150 * This ensures that there is at least one entry so that the sysinit_set 151 * symbol is not undefined. A sybsystem ID of SI_SUB_DUMMY is never 152 * executed. 153 */ 154 SYSINIT(placeholder, SI_SUB_DUMMY, SI_ORDER_ANY, NULL, NULL); 155 156 /* 157 * The sysinit table itself. Items are checked off as the are run. 158 * If we want to register new sysinit types, add them to newsysinit. 159 */ 160 SET_DECLARE(sysinit_set, struct sysinit); 161 struct sysinit **sysinit, **sysinit_end; 162 struct sysinit **newsysinit, **newsysinit_end; 163 164 /* 165 * Merge a new sysinit set into the current set, reallocating it if 166 * necessary. This can only be called after malloc is running. 167 */ 168 void 169 sysinit_add(struct sysinit **set, struct sysinit **set_end) 170 { 171 struct sysinit **newset; 172 struct sysinit **sipp; 173 struct sysinit **xipp; 174 int count; 175 176 count = set_end - set; 177 if (newsysinit) 178 count += newsysinit_end - newsysinit; 179 else 180 count += sysinit_end - sysinit; 181 newset = malloc(count * sizeof(*sipp), M_TEMP, M_NOWAIT); 182 if (newset == NULL) 183 panic("cannot malloc for sysinit"); 184 xipp = newset; 185 if (newsysinit) 186 for (sipp = newsysinit; sipp < newsysinit_end; sipp++) 187 *xipp++ = *sipp; 188 else 189 for (sipp = sysinit; sipp < sysinit_end; sipp++) 190 *xipp++ = *sipp; 191 for (sipp = set; sipp < set_end; sipp++) 192 *xipp++ = *sipp; 193 if (newsysinit) 194 free(newsysinit, M_TEMP); 195 newsysinit = newset; 196 newsysinit_end = newset + count; 197 } 198 199 #if defined (DDB) && defined(VERBOSE_SYSINIT) 200 static const char * 201 symbol_name(vm_offset_t va, db_strategy_t strategy) 202 { 203 const char *name; 204 c_db_sym_t sym; 205 db_expr_t offset; 206 207 if (va == 0) 208 return (NULL); 209 sym = db_search_symbol(va, strategy, &offset); 210 if (offset != 0) 211 return (NULL); 212 db_symbol_values(sym, &name, NULL); 213 return (name); 214 } 215 #endif 216 217 /* 218 * System startup; initialize the world, create process 0, mount root 219 * filesystem, and fork to create init and pagedaemon. Most of the 220 * hard work is done in the lower-level initialization routines including 221 * startup(), which does memory initialization and autoconfiguration. 222 * 223 * This allows simple addition of new kernel subsystems that require 224 * boot time initialization. It also allows substitution of subsystem 225 * (for instance, a scheduler, kernel profiler, or VM system) by object 226 * module. Finally, it allows for optional "kernel threads". 227 */ 228 void 229 mi_startup(void) 230 { 231 232 struct sysinit **sipp; /* system initialization*/ 233 struct sysinit **xipp; /* interior loop of sort*/ 234 struct sysinit *save; /* bubble*/ 235 236 #if defined(VERBOSE_SYSINIT) 237 int last; 238 int verbose; 239 #endif 240 241 TSENTER(); 242 243 if (boothowto & RB_VERBOSE) 244 bootverbose++; 245 246 if (sysinit == NULL) { 247 sysinit = SET_BEGIN(sysinit_set); 248 sysinit_end = SET_LIMIT(sysinit_set); 249 } 250 251 restart: 252 /* 253 * Perform a bubble sort of the system initialization objects by 254 * their subsystem (primary key) and order (secondary key). 255 */ 256 for (sipp = sysinit; sipp < sysinit_end; sipp++) { 257 for (xipp = sipp + 1; xipp < sysinit_end; xipp++) { 258 if ((*sipp)->subsystem < (*xipp)->subsystem || 259 ((*sipp)->subsystem == (*xipp)->subsystem && 260 (*sipp)->order <= (*xipp)->order)) 261 continue; /* skip*/ 262 save = *sipp; 263 *sipp = *xipp; 264 *xipp = save; 265 } 266 } 267 268 #if defined(VERBOSE_SYSINIT) 269 last = SI_SUB_COPYRIGHT; 270 verbose = 0; 271 #if !defined(DDB) 272 printf("VERBOSE_SYSINIT: DDB not enabled, symbol lookups disabled.\n"); 273 #endif 274 #endif 275 276 /* 277 * Traverse the (now) ordered list of system initialization tasks. 278 * Perform each task, and continue on to the next task. 279 */ 280 for (sipp = sysinit; sipp < sysinit_end; sipp++) { 281 282 if ((*sipp)->subsystem == SI_SUB_DUMMY) 283 continue; /* skip dummy task(s)*/ 284 285 if ((*sipp)->subsystem == SI_SUB_DONE) 286 continue; 287 288 #if defined(VERBOSE_SYSINIT) 289 if ((*sipp)->subsystem > last && verbose_sysinit != 0) { 290 verbose = 1; 291 last = (*sipp)->subsystem; 292 printf("subsystem %x\n", last); 293 } 294 if (verbose) { 295 #if defined(DDB) 296 const char *func, *data; 297 298 func = symbol_name((vm_offset_t)(*sipp)->func, 299 DB_STGY_PROC); 300 data = symbol_name((vm_offset_t)(*sipp)->udata, 301 DB_STGY_ANY); 302 if (func != NULL && data != NULL) 303 printf(" %s(&%s)... ", func, data); 304 else if (func != NULL) 305 printf(" %s(%p)... ", func, (*sipp)->udata); 306 else 307 #endif 308 printf(" %p(%p)... ", (*sipp)->func, 309 (*sipp)->udata); 310 } 311 #endif 312 313 /* Call function */ 314 (*((*sipp)->func))((*sipp)->udata); 315 316 #if defined(VERBOSE_SYSINIT) 317 if (verbose) 318 printf("done.\n"); 319 #endif 320 321 /* Check off the one we're just done */ 322 (*sipp)->subsystem = SI_SUB_DONE; 323 324 /* Check if we've installed more sysinit items via KLD */ 325 if (newsysinit != NULL) { 326 if (sysinit != SET_BEGIN(sysinit_set)) 327 free(sysinit, M_TEMP); 328 sysinit = newsysinit; 329 sysinit_end = newsysinit_end; 330 newsysinit = NULL; 331 newsysinit_end = NULL; 332 goto restart; 333 } 334 } 335 336 TSEXIT(); /* Here so we don't overlap with start_init. */ 337 338 mtx_assert(&Giant, MA_OWNED | MA_NOTRECURSED); 339 mtx_unlock(&Giant); 340 341 /* 342 * Now hand over this thread to swapper. 343 */ 344 swapper(); 345 /* NOTREACHED*/ 346 } 347 348 static void 349 print_caddr_t(void *data) 350 { 351 printf("%s", (char *)data); 352 } 353 354 static void 355 print_version(void *data __unused) 356 { 357 int len; 358 359 /* Strip a trailing newline from version. */ 360 len = strlen(version); 361 while (len > 0 && version[len - 1] == '\n') 362 len--; 363 printf("%.*s %s\n", len, version, machine); 364 printf("%s\n", compiler_version); 365 } 366 367 SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t, 368 copyright); 369 SYSINIT(trademark, SI_SUB_COPYRIGHT, SI_ORDER_SECOND, print_caddr_t, 370 trademark); 371 SYSINIT(version, SI_SUB_COPYRIGHT, SI_ORDER_THIRD, print_version, NULL); 372 373 #ifdef WITNESS 374 static char wit_warn[] = 375 "WARNING: WITNESS option enabled, expect reduced performance.\n"; 376 SYSINIT(witwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 1, 377 print_caddr_t, wit_warn); 378 SYSINIT(witwarn2, SI_SUB_LAST, SI_ORDER_THIRD + 1, 379 print_caddr_t, wit_warn); 380 #endif 381 382 #ifdef DIAGNOSTIC 383 static char diag_warn[] = 384 "WARNING: DIAGNOSTIC option enabled, expect reduced performance.\n"; 385 SYSINIT(diagwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 2, 386 print_caddr_t, diag_warn); 387 SYSINIT(diagwarn2, SI_SUB_LAST, SI_ORDER_THIRD + 2, 388 print_caddr_t, diag_warn); 389 #endif 390 391 static int 392 null_fetch_syscall_args(struct thread *td __unused) 393 { 394 395 panic("null_fetch_syscall_args"); 396 } 397 398 static void 399 null_set_syscall_retval(struct thread *td __unused, int error __unused) 400 { 401 402 panic("null_set_syscall_retval"); 403 } 404 405 struct sysentvec null_sysvec = { 406 .sv_size = 0, 407 .sv_table = NULL, 408 .sv_errsize = 0, 409 .sv_errtbl = NULL, 410 .sv_transtrap = NULL, 411 .sv_fixup = NULL, 412 .sv_sendsig = NULL, 413 .sv_sigcode = NULL, 414 .sv_szsigcode = NULL, 415 .sv_name = "null", 416 .sv_coredump = NULL, 417 .sv_imgact_try = NULL, 418 .sv_minsigstksz = 0, 419 .sv_minuser = VM_MIN_ADDRESS, 420 .sv_maxuser = VM_MAXUSER_ADDRESS, 421 .sv_usrstack = USRSTACK, 422 .sv_psstrings = PS_STRINGS, 423 .sv_stackprot = VM_PROT_ALL, 424 .sv_copyout_strings = NULL, 425 .sv_setregs = NULL, 426 .sv_fixlimit = NULL, 427 .sv_maxssiz = NULL, 428 .sv_flags = 0, 429 .sv_set_syscall_retval = null_set_syscall_retval, 430 .sv_fetch_syscall_args = null_fetch_syscall_args, 431 .sv_syscallnames = NULL, 432 .sv_schedtail = NULL, 433 .sv_thread_detach = NULL, 434 .sv_trap = NULL, 435 }; 436 437 /* 438 * The two following SYSINIT's are proc0 specific glue code. I am not 439 * convinced that they can not be safely combined, but their order of 440 * operation has been maintained as the same as the original init_main.c 441 * for right now. 442 */ 443 /* ARGSUSED*/ 444 static void 445 proc0_init(void *dummy __unused) 446 { 447 struct proc *p; 448 struct thread *td; 449 struct ucred *newcred; 450 struct uidinfo tmpuinfo; 451 struct loginclass tmplc = { 452 .lc_name = "", 453 }; 454 vm_paddr_t pageablemem; 455 int i; 456 457 GIANT_REQUIRED; 458 p = &proc0; 459 td = &thread0; 460 461 /* 462 * Initialize magic number and osrel. 463 */ 464 p->p_magic = P_MAGIC; 465 p->p_osrel = osreldate; 466 467 /* 468 * Initialize thread and process structures. 469 */ 470 procinit(); /* set up proc zone */ 471 threadinit(); /* set up UMA zones */ 472 473 /* 474 * Initialise scheduler resources. 475 * Add scheduler specific parts to proc, thread as needed. 476 */ 477 schedinit(); /* scheduler gets its house in order */ 478 479 /* 480 * Create process 0 (the swapper). 481 */ 482 LIST_INSERT_HEAD(&allproc, p, p_list); 483 LIST_INSERT_HEAD(PIDHASH(0), p, p_hash); 484 mtx_init(&pgrp0.pg_mtx, "process group", NULL, MTX_DEF | MTX_DUPOK); 485 p->p_pgrp = &pgrp0; 486 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash); 487 LIST_INIT(&pgrp0.pg_members); 488 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist); 489 490 pgrp0.pg_session = &session0; 491 mtx_init(&session0.s_mtx, "session", NULL, MTX_DEF); 492 refcount_init(&session0.s_count, 1); 493 session0.s_leader = p; 494 495 p->p_sysent = &null_sysvec; 496 p->p_flag = P_SYSTEM | P_INMEM | P_KPROC; 497 p->p_flag2 = 0; 498 p->p_state = PRS_NORMAL; 499 p->p_klist = knlist_alloc(&p->p_mtx); 500 STAILQ_INIT(&p->p_ktr); 501 p->p_nice = NZERO; 502 /* pid_max cannot be greater than PID_MAX */ 503 td->td_tid = PID_MAX + 1; 504 LIST_INSERT_HEAD(TIDHASH(td->td_tid), td, td_hash); 505 td->td_state = TDS_RUNNING; 506 td->td_pri_class = PRI_TIMESHARE; 507 td->td_user_pri = PUSER; 508 td->td_base_user_pri = PUSER; 509 td->td_lend_user_pri = PRI_MAX; 510 td->td_priority = PVM; 511 td->td_base_pri = PVM; 512 td->td_oncpu = curcpu; 513 td->td_flags = TDF_INMEM; 514 td->td_pflags = TDP_KTHREAD; 515 td->td_cpuset = cpuset_thread0(); 516 td->td_domain.dr_policy = td->td_cpuset->cs_domain; 517 prison0_init(); 518 p->p_peers = 0; 519 p->p_leader = p; 520 p->p_reaper = p; 521 p->p_treeflag |= P_TREE_REAPER; 522 LIST_INIT(&p->p_reaplist); 523 524 strncpy(p->p_comm, "kernel", sizeof (p->p_comm)); 525 strncpy(td->td_name, "swapper", sizeof (td->td_name)); 526 527 callout_init_mtx(&p->p_itcallout, &p->p_mtx, 0); 528 callout_init_mtx(&p->p_limco, &p->p_mtx, 0); 529 callout_init(&td->td_slpcallout, 1); 530 531 /* Create credentials. */ 532 newcred = crget(); 533 newcred->cr_ngroups = 1; /* group 0 */ 534 /* A hack to prevent uifind from tripping over NULL pointers. */ 535 curthread->td_ucred = newcred; 536 tmpuinfo.ui_uid = 1; 537 newcred->cr_uidinfo = newcred->cr_ruidinfo = &tmpuinfo; 538 newcred->cr_uidinfo = uifind(0); 539 newcred->cr_ruidinfo = uifind(0); 540 newcred->cr_loginclass = &tmplc; 541 newcred->cr_loginclass = loginclass_find("default"); 542 /* End hack. creds get properly set later with thread_cow_get_proc */ 543 curthread->td_ucred = NULL; 544 newcred->cr_prison = &prison0; 545 proc_set_cred_init(p, newcred); 546 #ifdef AUDIT 547 audit_cred_kproc0(newcred); 548 #endif 549 #ifdef MAC 550 mac_cred_create_swapper(newcred); 551 #endif 552 /* Create sigacts. */ 553 p->p_sigacts = sigacts_alloc(); 554 555 /* Initialize signal state for process 0. */ 556 siginit(&proc0); 557 558 /* Create the file descriptor table. */ 559 p->p_fd = fdinit(NULL, false); 560 p->p_fdtol = NULL; 561 562 /* Create the limits structures. */ 563 p->p_limit = lim_alloc(); 564 for (i = 0; i < RLIM_NLIMITS; i++) 565 p->p_limit->pl_rlimit[i].rlim_cur = 566 p->p_limit->pl_rlimit[i].rlim_max = RLIM_INFINITY; 567 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_cur = 568 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles; 569 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_cur = 570 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc; 571 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_cur = dfldsiz; 572 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_max = maxdsiz; 573 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_cur = dflssiz; 574 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_max = maxssiz; 575 /* Cast to avoid overflow on i386/PAE. */ 576 pageablemem = ptoa((vm_paddr_t)vm_free_count()); 577 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_cur = 578 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_max = pageablemem; 579 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = pageablemem / 3; 580 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_max = pageablemem; 581 p->p_cpulimit = RLIM_INFINITY; 582 583 PROC_LOCK(p); 584 thread_cow_get_proc(td, p); 585 PROC_UNLOCK(p); 586 587 /* Initialize resource accounting structures. */ 588 racct_create(&p->p_racct); 589 590 p->p_stats = pstats_alloc(); 591 592 /* Allocate a prototype map so we have something to fork. */ 593 p->p_vmspace = &vmspace0; 594 vmspace0.vm_refcnt = 1; 595 pmap_pinit0(vmspace_pmap(&vmspace0)); 596 597 /* 598 * proc0 is not expected to enter usermode, so there is no special 599 * handling for sv_minuser here, like is done for exec_new_vmspace(). 600 */ 601 vm_map_init(&vmspace0.vm_map, vmspace_pmap(&vmspace0), 602 p->p_sysent->sv_minuser, p->p_sysent->sv_maxuser); 603 604 /* 605 * Call the init and ctor for the new thread and proc. We wait 606 * to do this until all other structures are fairly sane. 607 */ 608 EVENTHANDLER_DIRECT_INVOKE(process_init, p); 609 EVENTHANDLER_DIRECT_INVOKE(thread_init, td); 610 EVENTHANDLER_DIRECT_INVOKE(process_ctor, p); 611 EVENTHANDLER_DIRECT_INVOKE(thread_ctor, td); 612 613 /* 614 * Charge root for one process. 615 */ 616 (void)chgproccnt(p->p_ucred->cr_ruidinfo, 1, 0); 617 PROC_LOCK(p); 618 racct_add_force(p, RACCT_NPROC, 1); 619 PROC_UNLOCK(p); 620 } 621 SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL); 622 623 /* ARGSUSED*/ 624 static void 625 proc0_post(void *dummy __unused) 626 { 627 struct proc *p; 628 struct rusage ru; 629 struct thread *td; 630 631 /* 632 * Now we can look at the time, having had a chance to verify the 633 * time from the filesystem. Pretend that proc0 started now. 634 */ 635 sx_slock(&allproc_lock); 636 FOREACH_PROC_IN_SYSTEM(p) { 637 PROC_LOCK(p); 638 if (p->p_state == PRS_NEW) { 639 PROC_UNLOCK(p); 640 continue; 641 } 642 microuptime(&p->p_stats->p_start); 643 PROC_STATLOCK(p); 644 rufetch(p, &ru); /* Clears thread stats */ 645 p->p_rux.rux_runtime = 0; 646 p->p_rux.rux_uticks = 0; 647 p->p_rux.rux_sticks = 0; 648 p->p_rux.rux_iticks = 0; 649 PROC_STATUNLOCK(p); 650 FOREACH_THREAD_IN_PROC(p, td) { 651 td->td_runtime = 0; 652 } 653 PROC_UNLOCK(p); 654 } 655 sx_sunlock(&allproc_lock); 656 PCPU_SET(switchtime, cpu_ticks()); 657 PCPU_SET(switchticks, ticks); 658 } 659 SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL); 660 661 /* 662 *************************************************************************** 663 **** 664 **** The following SYSINIT's and glue code should be moved to the 665 **** respective files on a per subsystem basis. 666 **** 667 *************************************************************************** 668 */ 669 670 /* 671 * List of paths to try when searching for "init". 672 */ 673 static char init_path[MAXPATHLEN] = 674 #ifdef INIT_PATH 675 __XSTRING(INIT_PATH); 676 #else 677 "/sbin/init:/sbin/oinit:/sbin/init.bak:/rescue/init"; 678 #endif 679 SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0, 680 "Path used to search the init process"); 681 682 /* 683 * Shutdown timeout of init(8). 684 * Unused within kernel, but used to control init(8), hence do not remove. 685 */ 686 #ifndef INIT_SHUTDOWN_TIMEOUT 687 #define INIT_SHUTDOWN_TIMEOUT 120 688 #endif 689 static int init_shutdown_timeout = INIT_SHUTDOWN_TIMEOUT; 690 SYSCTL_INT(_kern, OID_AUTO, init_shutdown_timeout, 691 CTLFLAG_RW, &init_shutdown_timeout, 0, "Shutdown timeout of init(8). " 692 "Unused within kernel, but used to control init(8)"); 693 694 /* 695 * Start the initial user process; try exec'ing each pathname in init_path. 696 * The program is invoked with one argument containing the boot flags. 697 */ 698 static void 699 start_init(void *dummy) 700 { 701 struct image_args args; 702 int error; 703 char *var, *path; 704 char *free_init_path, *tmp_init_path; 705 struct thread *td; 706 struct proc *p; 707 struct vmspace *oldvmspace; 708 709 TSENTER(); /* Here so we don't overlap with mi_startup. */ 710 711 td = curthread; 712 p = td->td_proc; 713 714 vfs_mountroot(); 715 716 /* Wipe GELI passphrase from the environment. */ 717 kern_unsetenv("kern.geom.eli.passphrase"); 718 719 if ((var = kern_getenv("init_path")) != NULL) { 720 strlcpy(init_path, var, sizeof(init_path)); 721 freeenv(var); 722 } 723 free_init_path = tmp_init_path = strdup(init_path, M_TEMP); 724 725 while ((path = strsep(&tmp_init_path, ":")) != NULL) { 726 if (bootverbose) 727 printf("start_init: trying %s\n", path); 728 729 memset(&args, 0, sizeof(args)); 730 error = exec_alloc_args(&args); 731 if (error != 0) 732 panic("%s: Can't allocate space for init arguments %d", 733 __func__, error); 734 735 error = exec_args_add_fname(&args, path, UIO_SYSSPACE); 736 if (error != 0) 737 panic("%s: Can't add fname %d", __func__, error); 738 error = exec_args_add_arg(&args, path, UIO_SYSSPACE); 739 if (error != 0) 740 panic("%s: Can't add argv[0] %d", __func__, error); 741 if (boothowto & RB_SINGLE) 742 error = exec_args_add_arg(&args, "-s", UIO_SYSSPACE); 743 if (error != 0) 744 panic("%s: Can't add argv[0] %d", __func__, error); 745 746 /* 747 * Now try to exec the program. If can't for any reason 748 * other than it doesn't exist, complain. 749 * 750 * Otherwise, return via fork_trampoline() all the way 751 * to user mode as init! 752 */ 753 KASSERT((td->td_pflags & TDP_EXECVMSPC) == 0, 754 ("nested execve")); 755 oldvmspace = td->td_proc->p_vmspace; 756 error = kern_execve(td, &args, NULL); 757 KASSERT(error != 0, 758 ("kern_execve returned success, not EJUSTRETURN")); 759 if (error == EJUSTRETURN) { 760 if ((td->td_pflags & TDP_EXECVMSPC) != 0) { 761 KASSERT(p->p_vmspace != oldvmspace, 762 ("oldvmspace still used")); 763 vmspace_free(oldvmspace); 764 td->td_pflags &= ~TDP_EXECVMSPC; 765 } 766 free(free_init_path, M_TEMP); 767 TSEXIT(); 768 return; 769 } 770 if (error != ENOENT) 771 printf("exec %s: error %d\n", path, error); 772 } 773 free(free_init_path, M_TEMP); 774 printf("init: not found in path %s\n", init_path); 775 panic("no init"); 776 } 777 778 /* 779 * Like kproc_create(), but runs in its own address space. We do this 780 * early to reserve pid 1. Note special case - do not make it 781 * runnable yet, init execution is started when userspace can be served. 782 */ 783 static void 784 create_init(const void *udata __unused) 785 { 786 struct fork_req fr; 787 struct ucred *newcred, *oldcred; 788 struct thread *td; 789 int error; 790 791 bzero(&fr, sizeof(fr)); 792 fr.fr_flags = RFFDG | RFPROC | RFSTOPPED; 793 fr.fr_procp = &initproc; 794 error = fork1(&thread0, &fr); 795 if (error) 796 panic("cannot fork init: %d\n", error); 797 KASSERT(initproc->p_pid == 1, ("create_init: initproc->p_pid != 1")); 798 /* divorce init's credentials from the kernel's */ 799 newcred = crget(); 800 sx_xlock(&proctree_lock); 801 PROC_LOCK(initproc); 802 initproc->p_flag |= P_SYSTEM | P_INMEM; 803 initproc->p_treeflag |= P_TREE_REAPER; 804 oldcred = initproc->p_ucred; 805 crcopy(newcred, oldcred); 806 #ifdef MAC 807 mac_cred_create_init(newcred); 808 #endif 809 #ifdef AUDIT 810 audit_cred_proc1(newcred); 811 #endif 812 proc_set_cred(initproc, newcred); 813 td = FIRST_THREAD_IN_PROC(initproc); 814 crfree(td->td_ucred); 815 td->td_ucred = crhold(initproc->p_ucred); 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