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/pmap.h> 91 #include <vm/vm_map.h> 92 #include <vm/vm_domain.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 INVARIANTS 123 FEATURE(invariants, "Kernel compiled with INVARIANTS, may affect performance"); 124 #endif 125 126 /* 127 * This ensures that there is at least one entry so that the sysinit_set 128 * symbol is not undefined. A sybsystem ID of SI_SUB_DUMMY is never 129 * executed. 130 */ 131 SYSINIT(placeholder, SI_SUB_DUMMY, SI_ORDER_ANY, NULL, NULL); 132 133 /* 134 * The sysinit table itself. Items are checked off as the are run. 135 * If we want to register new sysinit types, add them to newsysinit. 136 */ 137 SET_DECLARE(sysinit_set, struct sysinit); 138 struct sysinit **sysinit, **sysinit_end; 139 struct sysinit **newsysinit, **newsysinit_end; 140 141 EVENTHANDLER_LIST_DECLARE(process_init); 142 EVENTHANDLER_LIST_DECLARE(thread_init); 143 EVENTHANDLER_LIST_DECLARE(process_ctor); 144 EVENTHANDLER_LIST_DECLARE(thread_ctor); 145 146 /* 147 * Merge a new sysinit set into the current set, reallocating it if 148 * necessary. This can only be called after malloc is running. 149 */ 150 void 151 sysinit_add(struct sysinit **set, struct sysinit **set_end) 152 { 153 struct sysinit **newset; 154 struct sysinit **sipp; 155 struct sysinit **xipp; 156 int count; 157 158 count = set_end - set; 159 if (newsysinit) 160 count += newsysinit_end - newsysinit; 161 else 162 count += sysinit_end - sysinit; 163 newset = malloc(count * sizeof(*sipp), M_TEMP, M_NOWAIT); 164 if (newset == NULL) 165 panic("cannot malloc for sysinit"); 166 xipp = newset; 167 if (newsysinit) 168 for (sipp = newsysinit; sipp < newsysinit_end; sipp++) 169 *xipp++ = *sipp; 170 else 171 for (sipp = sysinit; sipp < sysinit_end; sipp++) 172 *xipp++ = *sipp; 173 for (sipp = set; sipp < set_end; sipp++) 174 *xipp++ = *sipp; 175 if (newsysinit) 176 free(newsysinit, M_TEMP); 177 newsysinit = newset; 178 newsysinit_end = newset + count; 179 } 180 181 #if defined (DDB) && defined(VERBOSE_SYSINIT) 182 static const char * 183 symbol_name(vm_offset_t va, db_strategy_t strategy) 184 { 185 const char *name; 186 c_db_sym_t sym; 187 db_expr_t offset; 188 189 if (va == 0) 190 return (NULL); 191 sym = db_search_symbol(va, strategy, &offset); 192 if (offset != 0) 193 return (NULL); 194 db_symbol_values(sym, &name, NULL); 195 return (name); 196 } 197 #endif 198 199 /* 200 * System startup; initialize the world, create process 0, mount root 201 * filesystem, and fork to create init and pagedaemon. Most of the 202 * hard work is done in the lower-level initialization routines including 203 * startup(), which does memory initialization and autoconfiguration. 204 * 205 * This allows simple addition of new kernel subsystems that require 206 * boot time initialization. It also allows substitution of subsystem 207 * (for instance, a scheduler, kernel profiler, or VM system) by object 208 * module. Finally, it allows for optional "kernel threads". 209 */ 210 void 211 mi_startup(void) 212 { 213 214 struct sysinit **sipp; /* system initialization*/ 215 struct sysinit **xipp; /* interior loop of sort*/ 216 struct sysinit *save; /* bubble*/ 217 218 #if defined(VERBOSE_SYSINIT) 219 int last; 220 int verbose; 221 #endif 222 223 if (boothowto & RB_VERBOSE) 224 bootverbose++; 225 226 if (sysinit == NULL) { 227 sysinit = SET_BEGIN(sysinit_set); 228 sysinit_end = SET_LIMIT(sysinit_set); 229 } 230 231 restart: 232 /* 233 * Perform a bubble sort of the system initialization objects by 234 * their subsystem (primary key) and order (secondary key). 235 */ 236 for (sipp = sysinit; sipp < sysinit_end; sipp++) { 237 for (xipp = sipp + 1; xipp < sysinit_end; xipp++) { 238 if ((*sipp)->subsystem < (*xipp)->subsystem || 239 ((*sipp)->subsystem == (*xipp)->subsystem && 240 (*sipp)->order <= (*xipp)->order)) 241 continue; /* skip*/ 242 save = *sipp; 243 *sipp = *xipp; 244 *xipp = save; 245 } 246 } 247 248 #if defined(VERBOSE_SYSINIT) 249 last = SI_SUB_COPYRIGHT; 250 verbose = 0; 251 #if !defined(DDB) 252 printf("VERBOSE_SYSINIT: DDB not enabled, symbol lookups disabled.\n"); 253 #endif 254 #endif 255 256 /* 257 * Traverse the (now) ordered list of system initialization tasks. 258 * Perform each task, and continue on to the next task. 259 */ 260 for (sipp = sysinit; sipp < sysinit_end; sipp++) { 261 262 if ((*sipp)->subsystem == SI_SUB_DUMMY) 263 continue; /* skip dummy task(s)*/ 264 265 if ((*sipp)->subsystem == SI_SUB_DONE) 266 continue; 267 268 #if defined(VERBOSE_SYSINIT) 269 if ((*sipp)->subsystem > last) { 270 verbose = 1; 271 last = (*sipp)->subsystem; 272 printf("subsystem %x\n", last); 273 } 274 if (verbose) { 275 #if defined(DDB) 276 const char *func, *data; 277 278 func = symbol_name((vm_offset_t)(*sipp)->func, 279 DB_STGY_PROC); 280 data = symbol_name((vm_offset_t)(*sipp)->udata, 281 DB_STGY_ANY); 282 if (func != NULL && data != NULL) 283 printf(" %s(&%s)... ", func, data); 284 else if (func != NULL) 285 printf(" %s(%p)... ", func, (*sipp)->udata); 286 else 287 #endif 288 printf(" %p(%p)... ", (*sipp)->func, 289 (*sipp)->udata); 290 } 291 #endif 292 293 /* Call function */ 294 (*((*sipp)->func))((*sipp)->udata); 295 296 #if defined(VERBOSE_SYSINIT) 297 if (verbose) 298 printf("done.\n"); 299 #endif 300 301 /* Check off the one we're just done */ 302 (*sipp)->subsystem = SI_SUB_DONE; 303 304 /* Check if we've installed more sysinit items via KLD */ 305 if (newsysinit != NULL) { 306 if (sysinit != SET_BEGIN(sysinit_set)) 307 free(sysinit, M_TEMP); 308 sysinit = newsysinit; 309 sysinit_end = newsysinit_end; 310 newsysinit = NULL; 311 newsysinit_end = NULL; 312 goto restart; 313 } 314 } 315 316 mtx_assert(&Giant, MA_OWNED | MA_NOTRECURSED); 317 mtx_unlock(&Giant); 318 319 /* 320 * Now hand over this thread to swapper. 321 */ 322 swapper(); 323 /* NOTREACHED*/ 324 } 325 326 static void 327 print_caddr_t(void *data) 328 { 329 printf("%s", (char *)data); 330 } 331 332 static void 333 print_version(void *data __unused) 334 { 335 int len; 336 337 /* Strip a trailing newline from version. */ 338 len = strlen(version); 339 while (len > 0 && version[len - 1] == '\n') 340 len--; 341 printf("%.*s %s\n", len, version, machine); 342 printf("%s\n", compiler_version); 343 } 344 345 SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t, 346 copyright); 347 SYSINIT(trademark, SI_SUB_COPYRIGHT, SI_ORDER_SECOND, print_caddr_t, 348 trademark); 349 SYSINIT(version, SI_SUB_COPYRIGHT, SI_ORDER_THIRD, print_version, NULL); 350 351 #ifdef WITNESS 352 static char wit_warn[] = 353 "WARNING: WITNESS option enabled, expect reduced performance.\n"; 354 SYSINIT(witwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 1, 355 print_caddr_t, wit_warn); 356 SYSINIT(witwarn2, SI_SUB_LAST, SI_ORDER_THIRD + 1, 357 print_caddr_t, wit_warn); 358 #endif 359 360 #ifdef DIAGNOSTIC 361 static char diag_warn[] = 362 "WARNING: DIAGNOSTIC option enabled, expect reduced performance.\n"; 363 SYSINIT(diagwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 2, 364 print_caddr_t, diag_warn); 365 SYSINIT(diagwarn2, SI_SUB_LAST, SI_ORDER_THIRD + 2, 366 print_caddr_t, diag_warn); 367 #endif 368 369 static int 370 null_fetch_syscall_args(struct thread *td __unused) 371 { 372 373 panic("null_fetch_syscall_args"); 374 } 375 376 static void 377 null_set_syscall_retval(struct thread *td __unused, int error __unused) 378 { 379 380 panic("null_set_syscall_retval"); 381 } 382 383 struct sysentvec null_sysvec = { 384 .sv_size = 0, 385 .sv_table = NULL, 386 .sv_mask = 0, 387 .sv_errsize = 0, 388 .sv_errtbl = NULL, 389 .sv_transtrap = NULL, 390 .sv_fixup = NULL, 391 .sv_sendsig = NULL, 392 .sv_sigcode = NULL, 393 .sv_szsigcode = 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 .sv_thread_detach = NULL, 414 .sv_trap = NULL, 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 /* ARGSUSED*/ 424 static void 425 proc0_init(void *dummy __unused) 426 { 427 struct proc *p; 428 struct thread *td; 429 struct ucred *newcred; 430 struct uidinfo tmpuinfo; 431 struct loginclass tmplc = { 432 .lc_name = "", 433 }; 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 | P_KPROC; 477 p->p_flag2 = 0; 478 p->p_state = PRS_NORMAL; 479 p->p_klist = knlist_alloc(&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 = curcpu; 493 td->td_flags = TDF_INMEM; 494 td->td_pflags = TDP_KTHREAD; 495 td->td_cpuset = cpuset_thread0(); 496 vm_domain_policy_init(&td->td_vm_dom_policy); 497 vm_domain_policy_set(&td->td_vm_dom_policy, VM_POLICY_NONE, -1); 498 vm_domain_policy_init(&p->p_vm_dom_policy); 499 vm_domain_policy_set(&p->p_vm_dom_policy, VM_POLICY_NONE, -1); 500 prison0_init(); 501 p->p_peers = 0; 502 p->p_leader = p; 503 p->p_reaper = p; 504 LIST_INIT(&p->p_reaplist); 505 506 strncpy(p->p_comm, "kernel", sizeof (p->p_comm)); 507 strncpy(td->td_name, "swapper", sizeof (td->td_name)); 508 509 callout_init_mtx(&p->p_itcallout, &p->p_mtx, 0); 510 callout_init_mtx(&p->p_limco, &p->p_mtx, 0); 511 callout_init(&td->td_slpcallout, 1); 512 513 /* Create credentials. */ 514 newcred = crget(); 515 newcred->cr_ngroups = 1; /* group 0 */ 516 /* A hack to prevent uifind from tripping over NULL pointers. */ 517 curthread->td_ucred = newcred; 518 tmpuinfo.ui_uid = 1; 519 newcred->cr_uidinfo = newcred->cr_ruidinfo = &tmpuinfo; 520 newcred->cr_uidinfo = uifind(0); 521 newcred->cr_ruidinfo = uifind(0); 522 newcred->cr_loginclass = &tmplc; 523 newcred->cr_loginclass = loginclass_find("default"); 524 /* End hack. creds get properly set later with thread_cow_get_proc */ 525 curthread->td_ucred = NULL; 526 newcred->cr_prison = &prison0; 527 proc_set_cred_init(p, newcred); 528 #ifdef AUDIT 529 audit_cred_kproc0(newcred); 530 #endif 531 #ifdef MAC 532 mac_cred_create_swapper(newcred); 533 #endif 534 /* Create sigacts. */ 535 p->p_sigacts = sigacts_alloc(); 536 537 /* Initialize signal state for process 0. */ 538 siginit(&proc0); 539 540 /* Create the file descriptor table. */ 541 p->p_fd = fdinit(NULL, false); 542 p->p_fdtol = NULL; 543 544 /* Create the limits structures. */ 545 p->p_limit = lim_alloc(); 546 for (i = 0; i < RLIM_NLIMITS; i++) 547 p->p_limit->pl_rlimit[i].rlim_cur = 548 p->p_limit->pl_rlimit[i].rlim_max = RLIM_INFINITY; 549 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_cur = 550 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles; 551 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_cur = 552 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc; 553 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_cur = dfldsiz; 554 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_max = maxdsiz; 555 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_cur = dflssiz; 556 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_max = maxssiz; 557 /* Cast to avoid overflow on i386/PAE. */ 558 pageablemem = ptoa((vm_paddr_t)vm_cnt.v_free_count); 559 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_cur = 560 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_max = pageablemem; 561 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = pageablemem / 3; 562 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_max = pageablemem; 563 p->p_cpulimit = RLIM_INFINITY; 564 565 PROC_LOCK(p); 566 thread_cow_get_proc(td, p); 567 PROC_UNLOCK(p); 568 569 /* Initialize resource accounting structures. */ 570 racct_create(&p->p_racct); 571 572 p->p_stats = pstats_alloc(); 573 574 /* Allocate a prototype map so we have something to fork. */ 575 p->p_vmspace = &vmspace0; 576 vmspace0.vm_refcnt = 1; 577 pmap_pinit0(vmspace_pmap(&vmspace0)); 578 579 /* 580 * proc0 is not expected to enter usermode, so there is no special 581 * handling for sv_minuser here, like is done for exec_new_vmspace(). 582 */ 583 vm_map_init(&vmspace0.vm_map, vmspace_pmap(&vmspace0), 584 p->p_sysent->sv_minuser, p->p_sysent->sv_maxuser); 585 586 /* 587 * Call the init and ctor for the new thread and proc. We wait 588 * to do this until all other structures are fairly sane. 589 */ 590 EVENTHANDLER_DIRECT_INVOKE(process_init, p); 591 EVENTHANDLER_DIRECT_INVOKE(thread_init, td); 592 EVENTHANDLER_DIRECT_INVOKE(process_ctor, p); 593 EVENTHANDLER_DIRECT_INVOKE(thread_ctor, td); 594 595 /* 596 * Charge root for one process. 597 */ 598 (void)chgproccnt(p->p_ucred->cr_ruidinfo, 1, 0); 599 PROC_LOCK(p); 600 racct_add_force(p, RACCT_NPROC, 1); 601 PROC_UNLOCK(p); 602 } 603 SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL); 604 605 /* ARGSUSED*/ 606 static void 607 proc0_post(void *dummy __unused) 608 { 609 struct timespec ts; 610 struct proc *p; 611 struct rusage ru; 612 struct thread *td; 613 614 /* 615 * Now we can look at the time, having had a chance to verify the 616 * time from the filesystem. Pretend that proc0 started now. 617 */ 618 sx_slock(&allproc_lock); 619 FOREACH_PROC_IN_SYSTEM(p) { 620 microuptime(&p->p_stats->p_start); 621 PROC_STATLOCK(p); 622 rufetch(p, &ru); /* Clears thread stats */ 623 PROC_STATUNLOCK(p); 624 p->p_rux.rux_runtime = 0; 625 p->p_rux.rux_uticks = 0; 626 p->p_rux.rux_sticks = 0; 627 p->p_rux.rux_iticks = 0; 628 FOREACH_THREAD_IN_PROC(p, td) { 629 td->td_runtime = 0; 630 } 631 } 632 sx_sunlock(&allproc_lock); 633 PCPU_SET(switchtime, cpu_ticks()); 634 PCPU_SET(switchticks, ticks); 635 636 /* 637 * Give the ``random'' number generator a thump. 638 */ 639 nanotime(&ts); 640 srandom(ts.tv_sec ^ ts.tv_nsec); 641 } 642 SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL); 643 644 static void 645 random_init(void *dummy __unused) 646 { 647 648 /* 649 * After CPU has been started we have some randomness on most 650 * platforms via get_cyclecount(). For platforms that don't 651 * we will reseed random(9) in proc0_post() as well. 652 */ 653 srandom(get_cyclecount()); 654 } 655 SYSINIT(random, SI_SUB_RANDOM, SI_ORDER_FIRST, random_init, NULL); 656 657 /* 658 *************************************************************************** 659 **** 660 **** The following SYSINIT's and glue code should be moved to the 661 **** respective files on a per subsystem basis. 662 **** 663 *************************************************************************** 664 */ 665 666 /* 667 * List of paths to try when searching for "init". 668 */ 669 static char init_path[MAXPATHLEN] = 670 #ifdef INIT_PATH 671 __XSTRING(INIT_PATH); 672 #else 673 "/sbin/init:/sbin/oinit:/sbin/init.bak:/rescue/init"; 674 #endif 675 SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0, 676 "Path used to search the init process"); 677 678 /* 679 * Shutdown timeout of init(8). 680 * Unused within kernel, but used to control init(8), hence do not remove. 681 */ 682 #ifndef INIT_SHUTDOWN_TIMEOUT 683 #define INIT_SHUTDOWN_TIMEOUT 120 684 #endif 685 static int init_shutdown_timeout = INIT_SHUTDOWN_TIMEOUT; 686 SYSCTL_INT(_kern, OID_AUTO, init_shutdown_timeout, 687 CTLFLAG_RW, &init_shutdown_timeout, 0, "Shutdown timeout of init(8). " 688 "Unused within kernel, but used to control init(8)"); 689 690 /* 691 * Start the initial user process; try exec'ing each pathname in init_path. 692 * The program is invoked with one argument containing the boot flags. 693 */ 694 static void 695 start_init(void *dummy) 696 { 697 vm_offset_t addr; 698 struct execve_args args; 699 int options, error; 700 char *var, *path, *next, *s; 701 char *ucp, **uap, *arg0, *arg1; 702 struct thread *td; 703 struct proc *p; 704 705 mtx_lock(&Giant); 706 707 GIANT_REQUIRED; 708 709 td = curthread; 710 p = td->td_proc; 711 712 vfs_mountroot(); 713 714 /* Wipe GELI passphrase from the environment. */ 715 kern_unsetenv("kern.geom.eli.passphrase"); 716 717 /* 718 * Need just enough stack to hold the faked-up "execve()" arguments. 719 */ 720 addr = p->p_sysent->sv_usrstack - PAGE_SIZE; 721 if (vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &addr, PAGE_SIZE, 0, 722 VMFS_NO_SPACE, VM_PROT_ALL, VM_PROT_ALL, 0) != 0) 723 panic("init: couldn't allocate argument space"); 724 p->p_vmspace->vm_maxsaddr = (caddr_t)addr; 725 p->p_vmspace->vm_ssize = 1; 726 727 if ((var = kern_getenv("init_path")) != NULL) { 728 strlcpy(init_path, var, sizeof(init_path)); 729 freeenv(var); 730 } 731 732 for (path = init_path; *path != '\0'; path = next) { 733 while (*path == ':') 734 path++; 735 if (*path == '\0') 736 break; 737 for (next = path; *next != '\0' && *next != ':'; next++) 738 /* nothing */ ; 739 if (bootverbose) 740 printf("start_init: trying %.*s\n", (int)(next - path), 741 path); 742 743 /* 744 * Move out the boot flag argument. 745 */ 746 options = 0; 747 ucp = (char *)p->p_sysent->sv_usrstack; 748 (void)subyte(--ucp, 0); /* trailing zero */ 749 if (boothowto & RB_SINGLE) { 750 (void)subyte(--ucp, 's'); 751 options = 1; 752 } 753 #ifdef notyet 754 if (boothowto & RB_FASTBOOT) { 755 (void)subyte(--ucp, 'f'); 756 options = 1; 757 } 758 #endif 759 760 #ifdef BOOTCDROM 761 (void)subyte(--ucp, 'C'); 762 options = 1; 763 #endif 764 765 if (options == 0) 766 (void)subyte(--ucp, '-'); 767 (void)subyte(--ucp, '-'); /* leading hyphen */ 768 arg1 = ucp; 769 770 /* 771 * Move out the file name (also arg 0). 772 */ 773 (void)subyte(--ucp, 0); 774 for (s = next - 1; s >= path; s--) 775 (void)subyte(--ucp, *s); 776 arg0 = ucp; 777 778 /* 779 * Move out the arg pointers. 780 */ 781 uap = (char **)rounddown2((intptr_t)ucp, sizeof(intptr_t)); 782 (void)suword((caddr_t)--uap, (long)0); /* terminator */ 783 (void)suword((caddr_t)--uap, (long)(intptr_t)arg1); 784 (void)suword((caddr_t)--uap, (long)(intptr_t)arg0); 785 786 /* 787 * Point at the arguments. 788 */ 789 args.fname = arg0; 790 args.argv = uap; 791 args.envv = NULL; 792 793 /* 794 * Now try to exec the program. If can't for any reason 795 * other than it doesn't exist, complain. 796 * 797 * Otherwise, return via fork_trampoline() all the way 798 * to user mode as init! 799 */ 800 if ((error = sys_execve(td, &args)) == EJUSTRETURN) { 801 mtx_unlock(&Giant); 802 return; 803 } 804 if (error != ENOENT) 805 printf("exec %.*s: error %d\n", (int)(next - path), 806 path, error); 807 } 808 printf("init: not found in path %s\n", init_path); 809 panic("no init"); 810 } 811 812 /* 813 * Like kproc_create(), but runs in its own address space. 814 * We do this early to reserve pid 1. 815 * 816 * Note special case - do not make it runnable yet. Other work 817 * in progress will change this more. 818 */ 819 static void 820 create_init(const void *udata __unused) 821 { 822 struct fork_req fr; 823 struct ucred *newcred, *oldcred; 824 struct thread *td; 825 int error; 826 827 bzero(&fr, sizeof(fr)); 828 fr.fr_flags = RFFDG | RFPROC | RFSTOPPED; 829 fr.fr_procp = &initproc; 830 error = fork1(&thread0, &fr); 831 if (error) 832 panic("cannot fork init: %d\n", error); 833 KASSERT(initproc->p_pid == 1, ("create_init: initproc->p_pid != 1")); 834 /* divorce init's credentials from the kernel's */ 835 newcred = crget(); 836 sx_xlock(&proctree_lock); 837 PROC_LOCK(initproc); 838 initproc->p_flag |= P_SYSTEM | P_INMEM; 839 initproc->p_treeflag |= P_TREE_REAPER; 840 LIST_INSERT_HEAD(&initproc->p_reaplist, &proc0, p_reapsibling); 841 oldcred = initproc->p_ucred; 842 crcopy(newcred, oldcred); 843 #ifdef MAC 844 mac_cred_create_init(newcred); 845 #endif 846 #ifdef AUDIT 847 audit_cred_proc1(newcred); 848 #endif 849 proc_set_cred(initproc, newcred); 850 td = FIRST_THREAD_IN_PROC(initproc); 851 crfree(td->td_ucred); 852 td->td_ucred = crhold(initproc->p_ucred); 853 PROC_UNLOCK(initproc); 854 sx_xunlock(&proctree_lock); 855 crfree(oldcred); 856 cpu_fork_kthread_handler(FIRST_THREAD_IN_PROC(initproc), 857 start_init, NULL); 858 } 859 SYSINIT(init, SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL); 860 861 /* 862 * Make it runnable now. 863 */ 864 static void 865 kick_init(const void *udata __unused) 866 { 867 struct thread *td; 868 869 td = FIRST_THREAD_IN_PROC(initproc); 870 thread_lock(td); 871 TD_SET_CAN_RUN(td); 872 sched_add(td, SRQ_BORING); 873 thread_unlock(td); 874 } 875 SYSINIT(kickinit, SI_SUB_KTHREAD_INIT, SI_ORDER_MIDDLE, kick_init, NULL); 876