Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/kern/init_main.c
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1 /* 2 * Copyright (c) 1995 Terrence R. Lambert 3 * All rights reserved. 4 * 5 * Copyright (c) 1982, 1986, 1989, 1991, 1992, 1993 6 * The Regents of the University of California. All rights reserved. 7 * (c) UNIX System Laboratories, Inc. 8 * All or some portions of this file are derived from material licensed 9 * to the University of California by American Telephone and Telegraph 10 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 11 * the permission of UNIX System Laboratories, Inc. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. All advertising materials mentioning features or use of this software 22 * must display the following acknowledgement: 23 * This product includes software developed by the University of 24 * California, Berkeley and its contributors. 25 * 4. Neither the name of the University nor the names of its contributors 26 * may be used to endorse or promote products derived from this software 27 * without specific prior written permission. 28 * 29 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 30 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 31 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 32 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 33 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 34 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 35 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 37 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 38 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 39 * SUCH DAMAGE. 40 * 41 * @(#)init_main.c 8.9 (Berkeley) 1/21/94 42 */ 43 44 #include <sys/cdefs.h> 45 __FBSDID("$FreeBSD: releng/5.2/sys/kern/init_main.c 120659 2003-10-02 03:57:59Z rwatson $"); 46 47 #include "opt_init_path.h" 48 #include "opt_mac.h" 49 50 #include <sys/param.h> 51 #include <sys/kernel.h> 52 #include <sys/exec.h> 53 #include <sys/file.h> 54 #include <sys/filedesc.h> 55 #include <sys/ktr.h> 56 #include <sys/lock.h> 57 #include <sys/mac.h> 58 #include <sys/mount.h> 59 #include <sys/mutex.h> 60 #include <sys/syscallsubr.h> 61 #include <sys/sysctl.h> 62 #include <sys/proc.h> 63 #include <sys/resourcevar.h> 64 #include <sys/systm.h> 65 #include <sys/signalvar.h> 66 #include <sys/vnode.h> 67 #include <sys/sysent.h> 68 #include <sys/reboot.h> 69 #include <sys/sched.h> 70 #include <sys/sx.h> 71 #include <sys/sysproto.h> 72 #include <sys/vmmeter.h> 73 #include <sys/unistd.h> 74 #include <sys/malloc.h> 75 #include <sys/conf.h> 76 77 #include <machine/cpu.h> 78 79 #include <vm/vm.h> 80 #include <vm/vm_param.h> 81 #include <vm/pmap.h> 82 #include <vm/vm_map.h> 83 #include <sys/user.h> 84 #include <sys/copyright.h> 85 86 void mi_startup(void); /* Should be elsewhere */ 87 88 /* Components of the first process -- never freed. */ 89 static struct session session0; 90 static struct pgrp pgrp0; 91 struct proc proc0; 92 struct thread thread0; 93 struct kse kse0; 94 struct ksegrp ksegrp0; 95 static struct filedesc0 filedesc0; 96 static struct plimit limit0; 97 struct vmspace vmspace0; 98 struct proc *initproc; 99 100 struct vnode *rootvp; 101 int boothowto = 0; /* initialized so that it can be patched */ 102 SYSCTL_INT(_debug, OID_AUTO, boothowto, CTLFLAG_RD, &boothowto, 0, ""); 103 int bootverbose; 104 SYSCTL_INT(_debug, OID_AUTO, bootverbose, CTLFLAG_RW, &bootverbose, 0, ""); 105 106 /* 107 * This ensures that there is at least one entry so that the sysinit_set 108 * symbol is not undefined. A sybsystem ID of SI_SUB_DUMMY is never 109 * executed. 110 */ 111 SYSINIT(placeholder, SI_SUB_DUMMY, SI_ORDER_ANY, NULL, NULL) 112 113 /* 114 * The sysinit table itself. Items are checked off as the are run. 115 * If we want to register new sysinit types, add them to newsysinit. 116 */ 117 SET_DECLARE(sysinit_set, struct sysinit); 118 struct sysinit **sysinit, **sysinit_end; 119 struct sysinit **newsysinit, **newsysinit_end; 120 121 /* 122 * Merge a new sysinit set into the current set, reallocating it if 123 * necessary. This can only be called after malloc is running. 124 */ 125 void 126 sysinit_add(struct sysinit **set, struct sysinit **set_end) 127 { 128 struct sysinit **newset; 129 struct sysinit **sipp; 130 struct sysinit **xipp; 131 int count; 132 133 count = set_end - set; 134 if (newsysinit) 135 count += newsysinit_end - newsysinit; 136 else 137 count += sysinit_end - sysinit; 138 newset = malloc(count * sizeof(*sipp), M_TEMP, M_NOWAIT); 139 if (newset == NULL) 140 panic("cannot malloc for sysinit"); 141 xipp = newset; 142 if (newsysinit) 143 for (sipp = newsysinit; sipp < newsysinit_end; sipp++) 144 *xipp++ = *sipp; 145 else 146 for (sipp = sysinit; sipp < sysinit_end; sipp++) 147 *xipp++ = *sipp; 148 for (sipp = set; sipp < set_end; sipp++) 149 *xipp++ = *sipp; 150 if (newsysinit) 151 free(newsysinit, M_TEMP); 152 newsysinit = newset; 153 newsysinit_end = newset + count; 154 } 155 156 /* 157 * System startup; initialize the world, create process 0, mount root 158 * filesystem, and fork to create init and pagedaemon. Most of the 159 * hard work is done in the lower-level initialization routines including 160 * startup(), which does memory initialization and autoconfiguration. 161 * 162 * This allows simple addition of new kernel subsystems that require 163 * boot time initialization. It also allows substitution of subsystem 164 * (for instance, a scheduler, kernel profiler, or VM system) by object 165 * module. Finally, it allows for optional "kernel threads". 166 */ 167 void 168 mi_startup(void) 169 { 170 171 register struct sysinit **sipp; /* system initialization*/ 172 register struct sysinit **xipp; /* interior loop of sort*/ 173 register struct sysinit *save; /* bubble*/ 174 175 if (sysinit == NULL) { 176 sysinit = SET_BEGIN(sysinit_set); 177 sysinit_end = SET_LIMIT(sysinit_set); 178 } 179 180 restart: 181 /* 182 * Perform a bubble sort of the system initialization objects by 183 * their subsystem (primary key) and order (secondary key). 184 */ 185 for (sipp = sysinit; sipp < sysinit_end; sipp++) { 186 for (xipp = sipp + 1; xipp < sysinit_end; xipp++) { 187 if ((*sipp)->subsystem < (*xipp)->subsystem || 188 ((*sipp)->subsystem == (*xipp)->subsystem && 189 (*sipp)->order <= (*xipp)->order)) 190 continue; /* skip*/ 191 save = *sipp; 192 *sipp = *xipp; 193 *xipp = save; 194 } 195 } 196 197 /* 198 * Traverse the (now) ordered list of system initialization tasks. 199 * Perform each task, and continue on to the next task. 200 * 201 * The last item on the list is expected to be the scheduler, 202 * which will not return. 203 */ 204 for (sipp = sysinit; sipp < sysinit_end; sipp++) { 205 206 if ((*sipp)->subsystem == SI_SUB_DUMMY) 207 continue; /* skip dummy task(s)*/ 208 209 if ((*sipp)->subsystem == SI_SUB_DONE) 210 continue; 211 212 /* Call function */ 213 (*((*sipp)->func))((*sipp)->udata); 214 215 /* Check off the one we're just done */ 216 (*sipp)->subsystem = SI_SUB_DONE; 217 218 /* Check if we've installed more sysinit items via KLD */ 219 if (newsysinit != NULL) { 220 if (sysinit != SET_BEGIN(sysinit_set)) 221 free(sysinit, M_TEMP); 222 sysinit = newsysinit; 223 sysinit_end = newsysinit_end; 224 newsysinit = NULL; 225 newsysinit_end = NULL; 226 goto restart; 227 } 228 } 229 230 panic("Shouldn't get here!"); 231 /* NOTREACHED*/ 232 } 233 234 235 /* 236 *************************************************************************** 237 **** 238 **** The following SYSINIT's belong elsewhere, but have not yet 239 **** been moved. 240 **** 241 *************************************************************************** 242 */ 243 static void 244 print_caddr_t(void *data __unused) 245 { 246 printf("%s", (char *)data); 247 } 248 SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t, copyright) 249 SYSINIT(version, SI_SUB_COPYRIGHT, SI_ORDER_SECOND, print_caddr_t, version) 250 251 static void 252 set_boot_verbose(void *data __unused) 253 { 254 255 if (boothowto & RB_VERBOSE) 256 bootverbose++; 257 } 258 SYSINIT(boot_verbose, SI_SUB_TUNABLES, SI_ORDER_ANY, set_boot_verbose, NULL) 259 260 struct sysentvec null_sysvec = { 261 0, 262 NULL, 263 0, 264 0, 265 NULL, 266 0, 267 NULL, 268 NULL, 269 NULL, 270 NULL, 271 NULL, 272 NULL, 273 NULL, 274 "null", 275 NULL, 276 NULL, 277 0, 278 PAGE_SIZE, 279 VM_MIN_ADDRESS, 280 VM_MAXUSER_ADDRESS, 281 USRSTACK, 282 PS_STRINGS, 283 VM_PROT_ALL, 284 NULL, 285 NULL, 286 NULL 287 }; 288 289 /* 290 *************************************************************************** 291 **** 292 **** The two following SYSINIT's are proc0 specific glue code. I am not 293 **** convinced that they can not be safely combined, but their order of 294 **** operation has been maintained as the same as the original init_main.c 295 **** for right now. 296 **** 297 **** These probably belong in init_proc.c or kern_proc.c, since they 298 **** deal with proc0 (the fork template process). 299 **** 300 *************************************************************************** 301 */ 302 /* ARGSUSED*/ 303 static void 304 proc0_init(void *dummy __unused) 305 { 306 register struct proc *p; 307 register struct filedesc0 *fdp; 308 register unsigned i; 309 struct thread *td; 310 struct ksegrp *kg; 311 struct kse *ke; 312 313 GIANT_REQUIRED; 314 p = &proc0; 315 td = &thread0; 316 ke = &kse0; 317 kg = &ksegrp0; 318 319 ke->ke_sched = kse0_sched; 320 kg->kg_sched = ksegrp0_sched; 321 p->p_sched = proc0_sched; 322 td->td_sched = thread0_sched; 323 324 /* 325 * Initialize magic number. 326 */ 327 p->p_magic = P_MAGIC; 328 329 /* 330 * Initialize thread, process and pgrp structures. 331 */ 332 procinit(); 333 threadinit(); 334 335 /* 336 * Initialize sleep queue hash table 337 */ 338 sleepinit(); 339 340 /* 341 * additional VM structures 342 */ 343 vm_init2(); 344 345 /* 346 * Create process 0 (the swapper). 347 */ 348 LIST_INSERT_HEAD(&allproc, p, p_list); 349 LIST_INSERT_HEAD(PIDHASH(0), p, p_hash); 350 mtx_init(&pgrp0.pg_mtx, "process group", NULL, MTX_DEF | MTX_DUPOK); 351 p->p_pgrp = &pgrp0; 352 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash); 353 LIST_INIT(&pgrp0.pg_members); 354 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist); 355 356 pgrp0.pg_session = &session0; 357 mtx_init(&session0.s_mtx, "session", NULL, MTX_DEF); 358 session0.s_count = 1; 359 session0.s_leader = p; 360 361 p->p_sysent = &null_sysvec; 362 363 /* 364 * proc_linkup was already done in init_i386() or alphainit() etc. 365 * because the earlier code needed to follow td->td_proc. Otherwise 366 * I would have done it here.. maybe this means this should be 367 * done earlier too. 368 */ 369 p->p_flag = P_SYSTEM; 370 p->p_sflag = PS_INMEM; 371 p->p_state = PRS_NORMAL; 372 td->td_state = TDS_RUNNING; 373 kg->kg_nice = NZERO; 374 kg->kg_pri_class = PRI_TIMESHARE; 375 kg->kg_user_pri = PUSER; 376 td->td_priority = PVM; 377 td->td_base_pri = PUSER; 378 td->td_kse = ke; /* XXXKSE */ 379 td->td_oncpu = 0; 380 ke->ke_state = KES_THREAD; 381 ke->ke_thread = td; 382 p->p_peers = 0; 383 p->p_leader = p; 384 385 386 bcopy("swapper", p->p_comm, sizeof ("swapper")); 387 388 callout_init(&p->p_itcallout, CALLOUT_MPSAFE); 389 callout_init(&td->td_slpcallout, CALLOUT_MPSAFE); 390 391 /* Create credentials. */ 392 p->p_ucred = crget(); 393 p->p_ucred->cr_ngroups = 1; /* group 0 */ 394 p->p_ucred->cr_uidinfo = uifind(0); 395 p->p_ucred->cr_ruidinfo = uifind(0); 396 p->p_ucred->cr_prison = NULL; /* Don't jail it. */ 397 #ifdef MAC 398 mac_create_proc0(p->p_ucred); 399 #endif 400 td->td_ucred = crhold(p->p_ucred); 401 402 /* Create sigacts. */ 403 p->p_sigacts = sigacts_alloc(); 404 405 /* Initialize signal state for process 0. */ 406 siginit(&proc0); 407 408 /* Create the file descriptor table. */ 409 fdp = &filedesc0; 410 p->p_fd = &fdp->fd_fd; 411 p->p_fdtol = NULL; 412 mtx_init(&fdp->fd_fd.fd_mtx, FILEDESC_LOCK_DESC, NULL, MTX_DEF); 413 fdp->fd_fd.fd_refcnt = 1; 414 fdp->fd_fd.fd_cmask = CMASK; 415 fdp->fd_fd.fd_ofiles = fdp->fd_dfiles; 416 fdp->fd_fd.fd_ofileflags = fdp->fd_dfileflags; 417 fdp->fd_fd.fd_nfiles = NDFILE; 418 419 /* Create the limits structures. */ 420 p->p_limit = &limit0; 421 for (i = 0; i < sizeof(p->p_rlimit)/sizeof(p->p_rlimit[0]); i++) 422 limit0.pl_rlimit[i].rlim_cur = 423 limit0.pl_rlimit[i].rlim_max = RLIM_INFINITY; 424 limit0.pl_rlimit[RLIMIT_NOFILE].rlim_cur = 425 limit0.pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles; 426 limit0.pl_rlimit[RLIMIT_NPROC].rlim_cur = 427 limit0.pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc; 428 i = ptoa(cnt.v_free_count); 429 limit0.pl_rlimit[RLIMIT_RSS].rlim_max = i; 430 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_max = i; 431 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = i / 3; 432 limit0.p_refcnt = 1; 433 p->p_cpulimit = RLIM_INFINITY; 434 435 /* Allocate a prototype map so we have something to fork. */ 436 pmap_pinit0(vmspace_pmap(&vmspace0)); 437 p->p_vmspace = &vmspace0; 438 vmspace0.vm_refcnt = 1; 439 vm_map_init(&vmspace0.vm_map, p->p_sysent->sv_minuser, 440 p->p_sysent->sv_maxuser); 441 vmspace0.vm_map.pmap = vmspace_pmap(&vmspace0); 442 443 /* 444 * We continue to place resource usage info 445 * in the user struct so that it's pageable. 446 */ 447 p->p_stats = &p->p_uarea->u_stats; 448 449 /* 450 * Charge root for one process. 451 */ 452 (void)chgproccnt(p->p_ucred->cr_ruidinfo, 1, 0); 453 } 454 SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL) 455 456 /* ARGSUSED*/ 457 static void 458 proc0_post(void *dummy __unused) 459 { 460 struct timespec ts; 461 struct proc *p; 462 463 /* 464 * Now we can look at the time, having had a chance to verify the 465 * time from the filesystem. Pretend that proc0 started now. 466 */ 467 sx_slock(&allproc_lock); 468 LIST_FOREACH(p, &allproc, p_list) { 469 microuptime(&p->p_stats->p_start); 470 p->p_runtime.sec = 0; 471 p->p_runtime.frac = 0; 472 } 473 sx_sunlock(&allproc_lock); 474 binuptime(PCPU_PTR(switchtime)); 475 PCPU_SET(switchticks, ticks); 476 477 /* 478 * Give the ``random'' number generator a thump. 479 */ 480 nanotime(&ts); 481 srandom(ts.tv_sec ^ ts.tv_nsec); 482 } 483 SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL) 484 485 /* 486 *************************************************************************** 487 **** 488 **** The following SYSINIT's and glue code should be moved to the 489 **** respective files on a per subsystem basis. 490 **** 491 *************************************************************************** 492 */ 493 494 495 /* 496 *************************************************************************** 497 **** 498 **** The following code probably belongs in another file, like 499 **** kern/init_init.c. 500 **** 501 *************************************************************************** 502 */ 503 504 /* 505 * List of paths to try when searching for "init". 506 */ 507 static char init_path[MAXPATHLEN] = 508 #ifdef INIT_PATH 509 __XSTRING(INIT_PATH); 510 #else 511 "/sbin/init:/sbin/oinit:/sbin/init.bak:/stand/sysinstall"; 512 #endif 513 SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0, 514 "Path used to search the init process"); 515 516 /* 517 * Start the initial user process; try exec'ing each pathname in init_path. 518 * The program is invoked with one argument containing the boot flags. 519 */ 520 static void 521 start_init(void *dummy) 522 { 523 vm_offset_t addr; 524 struct execve_args args; 525 int options, error; 526 char *var, *path, *next, *s; 527 char *ucp, **uap, *arg0, *arg1; 528 struct thread *td; 529 struct proc *p; 530 int init_does_devfs = 0; 531 532 mtx_lock(&Giant); 533 534 GIANT_REQUIRED; 535 536 td = curthread; 537 p = td->td_proc; 538 539 vfs_mountroot(); 540 541 /* Get the vnode for '/'. Set p->p_fd->fd_cdir to reference it. */ 542 if (VFS_ROOT(TAILQ_FIRST(&mountlist), &rootvnode)) 543 panic("cannot find root vnode"); 544 FILEDESC_LOCK(p->p_fd); 545 p->p_fd->fd_cdir = rootvnode; 546 VREF(p->p_fd->fd_cdir); 547 p->p_fd->fd_rdir = rootvnode; 548 VREF(p->p_fd->fd_rdir); 549 FILEDESC_UNLOCK(p->p_fd); 550 VOP_UNLOCK(rootvnode, 0, td); 551 #ifdef MAC 552 mac_create_root_mount(td->td_ucred, TAILQ_FIRST(&mountlist)); 553 #endif 554 555 /* 556 * For disk based systems, we probably cannot do this yet 557 * since the fs will be read-only. But a NFS root 558 * might be ok. It is worth a shot. 559 */ 560 error = kern_mkdir(td, "/dev", UIO_SYSSPACE, 0700); 561 if (error == EEXIST) 562 error = 0; 563 if (error == 0) 564 error = kernel_vmount(0, "fstype", "devfs", 565 "fspath", "/dev", NULL); 566 if (error != 0) 567 init_does_devfs = 1; 568 569 /* 570 * Need just enough stack to hold the faked-up "execve()" arguments. 571 */ 572 addr = p->p_sysent->sv_usrstack - PAGE_SIZE; 573 if (vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &addr, PAGE_SIZE, 574 FALSE, VM_PROT_ALL, VM_PROT_ALL, 0) != 0) 575 panic("init: couldn't allocate argument space"); 576 p->p_vmspace->vm_maxsaddr = (caddr_t)addr; 577 p->p_vmspace->vm_ssize = 1; 578 579 if ((var = getenv("init_path")) != NULL) { 580 strlcpy(init_path, var, sizeof(init_path)); 581 freeenv(var); 582 } 583 584 for (path = init_path; *path != '\0'; path = next) { 585 while (*path == ':') 586 path++; 587 if (*path == '\0') 588 break; 589 for (next = path; *next != '\0' && *next != ':'; next++) 590 /* nothing */ ; 591 if (bootverbose) 592 printf("start_init: trying %.*s\n", (int)(next - path), 593 path); 594 595 /* 596 * Move out the boot flag argument. 597 */ 598 options = 0; 599 ucp = (char *)p->p_sysent->sv_usrstack; 600 (void)subyte(--ucp, 0); /* trailing zero */ 601 if (boothowto & RB_SINGLE) { 602 (void)subyte(--ucp, 's'); 603 options = 1; 604 } 605 #ifdef notyet 606 if (boothowto & RB_FASTBOOT) { 607 (void)subyte(--ucp, 'f'); 608 options = 1; 609 } 610 #endif 611 612 #ifdef BOOTCDROM 613 (void)subyte(--ucp, 'C'); 614 options = 1; 615 #endif 616 if (init_does_devfs) { 617 (void)subyte(--ucp, 'd'); 618 options = 1; 619 } 620 621 if (options == 0) 622 (void)subyte(--ucp, '-'); 623 (void)subyte(--ucp, '-'); /* leading hyphen */ 624 arg1 = ucp; 625 626 /* 627 * Move out the file name (also arg 0). 628 */ 629 (void)subyte(--ucp, 0); 630 for (s = next - 1; s >= path; s--) 631 (void)subyte(--ucp, *s); 632 arg0 = ucp; 633 634 /* 635 * Move out the arg pointers. 636 */ 637 uap = (char **)((intptr_t)ucp & ~(sizeof(intptr_t)-1)); 638 (void)suword((caddr_t)--uap, (long)0); /* terminator */ 639 (void)suword((caddr_t)--uap, (long)(intptr_t)arg1); 640 (void)suword((caddr_t)--uap, (long)(intptr_t)arg0); 641 642 /* 643 * Point at the arguments. 644 */ 645 args.fname = arg0; 646 args.argv = uap; 647 args.envv = NULL; 648 649 /* 650 * Now try to exec the program. If can't for any reason 651 * other than it doesn't exist, complain. 652 * 653 * Otherwise, return via fork_trampoline() all the way 654 * to user mode as init! 655 */ 656 if ((error = execve(td, &args)) == 0) { 657 mtx_unlock(&Giant); 658 return; 659 } 660 if (error != ENOENT) 661 printf("exec %.*s: error %d\n", (int)(next - path), 662 path, error); 663 } 664 printf("init: not found in path %s\n", init_path); 665 panic("no init"); 666 } 667 668 /* 669 * Like kthread_create(), but runs in it's own address space. 670 * We do this early to reserve pid 1. 671 * 672 * Note special case - do not make it runnable yet. Other work 673 * in progress will change this more. 674 */ 675 static void 676 create_init(const void *udata __unused) 677 { 678 struct ucred *newcred, *oldcred; 679 int error; 680 681 error = fork1(&thread0, RFFDG | RFPROC | RFSTOPPED, 0, &initproc); 682 if (error) 683 panic("cannot fork init: %d\n", error); 684 /* divorce init's credentials from the kernel's */ 685 newcred = crget(); 686 PROC_LOCK(initproc); 687 initproc->p_flag |= P_SYSTEM; 688 oldcred = initproc->p_ucred; 689 crcopy(newcred, oldcred); 690 #ifdef MAC 691 mac_create_proc1(newcred); 692 #endif 693 initproc->p_ucred = newcred; 694 PROC_UNLOCK(initproc); 695 crfree(oldcred); 696 cred_update_thread(FIRST_THREAD_IN_PROC(initproc)); 697 mtx_lock_spin(&sched_lock); 698 initproc->p_sflag |= PS_INMEM; 699 mtx_unlock_spin(&sched_lock); 700 cpu_set_fork_handler(FIRST_THREAD_IN_PROC(initproc), start_init, NULL); 701 } 702 SYSINIT(init, SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL) 703 704 /* 705 * Make it runnable now. 706 */ 707 static void 708 kick_init(const void *udata __unused) 709 { 710 struct thread *td; 711 712 td = FIRST_THREAD_IN_PROC(initproc); 713 mtx_lock_spin(&sched_lock); 714 TD_SET_CAN_RUN(td); 715 setrunqueue(td); /* XXXKSE */ 716 mtx_unlock_spin(&sched_lock); 717 } 718 SYSINIT(kickinit, SI_SUB_KTHREAD_INIT, SI_ORDER_FIRST, kick_init, NULL)
Cache object: eefd88f96aeb0f9bb868d615a6bbea73
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