init_main.c revision 1.353
1 /* $NetBSD: init_main.c,v 1.353 2008/04/24 18:39:23 ad Exp $ */ 2 3 /*- 4 * Copyright (c) 2008 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the NetBSD 18 * Foundation, Inc. and its contributors. 19 * 4. Neither the name of The NetBSD Foundation nor the names of its 20 * contributors may be used to endorse or promote products derived 21 * from this software without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 24 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 25 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 26 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 27 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 33 * POSSIBILITY OF SUCH DAMAGE. 34 */ 35 36 /* 37 * Copyright (c) 1982, 1986, 1989, 1991, 1992, 1993 38 * The Regents of the University of California. All rights reserved. 39 * (c) UNIX System Laboratories, Inc. 40 * All or some portions of this file are derived from material licensed 41 * to the University of California by American Telephone and Telegraph 42 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 43 * the permission of UNIX System Laboratories, Inc. 44 * 45 * Redistribution and use in source and binary forms, with or without 46 * modification, are permitted provided that the following conditions 47 * are met: 48 * 1. Redistributions of source code must retain the above copyright 49 * notice, this list of conditions and the following disclaimer. 50 * 2. Redistributions in binary form must reproduce the above copyright 51 * notice, this list of conditions and the following disclaimer in the 52 * documentation and/or other materials provided with the distribution. 53 * 3. Neither the name of the University nor the names of its contributors 54 * may be used to endorse or promote products derived from this software 55 * without specific prior written permission. 56 * 57 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 58 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 59 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 60 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 61 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 62 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 63 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 64 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 65 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 66 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 67 * SUCH DAMAGE. 68 * 69 * @(#)init_main.c 8.16 (Berkeley) 5/14/95 70 */ 71 72 /* 73 * Copyright (c) 1995 Christopher G. Demetriou. All rights reserved. 74 * 75 * Redistribution and use in source and binary forms, with or without 76 * modification, are permitted provided that the following conditions 77 * are met: 78 * 1. Redistributions of source code must retain the above copyright 79 * notice, this list of conditions and the following disclaimer. 80 * 2. Redistributions in binary form must reproduce the above copyright 81 * notice, this list of conditions and the following disclaimer in the 82 * documentation and/or other materials provided with the distribution. 83 * 3. All advertising materials mentioning features or use of this software 84 * must display the following acknowledgement: 85 * This product includes software developed by the University of 86 * California, Berkeley and its contributors. 87 * 4. Neither the name of the University nor the names of its contributors 88 * may be used to endorse or promote products derived from this software 89 * without specific prior written permission. 90 * 91 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 92 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 93 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 94 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 95 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 96 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 97 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 98 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 99 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 100 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 101 * SUCH DAMAGE. 102 * 103 * @(#)init_main.c 8.16 (Berkeley) 5/14/95 104 */ 105 106 #include <sys/cdefs.h> 107 __KERNEL_RCSID(0, "$NetBSD: init_main.c,v 1.353 2008/04/24 18:39:23 ad Exp $"); 108 109 #include "opt_ipsec.h" 110 #include "opt_ntp.h" 111 #include "opt_pipe.h" 112 #include "opt_posix.h" 113 #include "opt_syscall_debug.h" 114 #include "opt_sysv.h" 115 #include "opt_fileassoc.h" 116 #include "opt_ktrace.h" 117 #include "opt_pax.h" 118 119 #include "rnd.h" 120 #include "sysmon_envsys.h" 121 #include "sysmon_power.h" 122 #include "sysmon_taskq.h" 123 #include "sysmon_wdog.h" 124 #include "veriexec.h" 125 126 #include <sys/param.h> 127 #include <sys/acct.h> 128 #include <sys/filedesc.h> 129 #include <sys/file.h> 130 #include <sys/errno.h> 131 #include <sys/callout.h> 132 #include <sys/cpu.h> 133 #include <sys/kernel.h> 134 #include <sys/kmem.h> 135 #include <sys/mount.h> 136 #include <sys/proc.h> 137 #include <sys/kthread.h> 138 #include <sys/resourcevar.h> 139 #include <sys/signalvar.h> 140 #include <sys/systm.h> 141 #include <sys/vnode.h> 142 #include <sys/fstrans.h> 143 #include <sys/tty.h> 144 #include <sys/conf.h> 145 #include <sys/disklabel.h> 146 #include <sys/buf.h> 147 #include <sys/device.h> 148 #include <sys/exec.h> 149 #include <sys/socketvar.h> 150 #include <sys/protosw.h> 151 #include <sys/percpu.h> 152 #include <sys/pset.h> 153 #include <sys/sysctl.h> 154 #include <sys/reboot.h> 155 #include <sys/user.h> 156 #include <sys/sysctl.h> 157 #include <sys/event.h> 158 #include <sys/mbuf.h> 159 #include <sys/sched.h> 160 #include <sys/sleepq.h> 161 #include <sys/iostat.h> 162 #include <sys/vmem.h> 163 #include <sys/uuid.h> 164 #include <sys/extent.h> 165 #include <sys/disk.h> 166 #include <sys/mqueue.h> 167 #include <sys/msgbuf.h> 168 #include <sys/module.h> 169 #include <sys/event.h> 170 #ifdef FAST_IPSEC 171 #include <netipsec/ipsec.h> 172 #endif 173 #ifdef SYSVSHM 174 #include <sys/shm.h> 175 #endif 176 #ifdef SYSVSEM 177 #include <sys/sem.h> 178 #endif 179 #ifdef SYSVMSG 180 #include <sys/msg.h> 181 #endif 182 #ifdef P1003_1B_SEMAPHORE 183 #include <sys/ksem.h> 184 #endif 185 #include <sys/domain.h> 186 #include <sys/namei.h> 187 #if NRND > 0 188 #include <sys/rnd.h> 189 #endif 190 #include <sys/pipe.h> 191 #ifdef LKM 192 #include <sys/lkm.h> 193 #endif 194 #if NVERIEXEC > 0 195 #include <sys/verified_exec.h> 196 #endif /* NVERIEXEC > 0 */ 197 #ifdef KTRACE 198 #include <sys/ktrace.h> 199 #endif 200 #include <sys/kauth.h> 201 #include <net80211/ieee80211_netbsd.h> 202 203 #include <sys/syscall.h> 204 #include <sys/syscallargs.h> 205 206 #if defined(PAX_MPROTECT) || defined(PAX_SEGVGUARD) || defined(PAX_ASLR) 207 #include <sys/pax.h> 208 #endif /* PAX_MPROTECT || PAX_SEGVGUARD || PAX_ASLR */ 209 210 #include <ufs/ufs/quota.h> 211 212 #include <miscfs/genfs/genfs.h> 213 #include <miscfs/syncfs/syncfs.h> 214 215 #include <sys/cpu.h> 216 217 #include <uvm/uvm.h> 218 219 #if NSYSMON_TASKQ > 0 220 #include <dev/sysmon/sysmon_taskq.h> 221 #endif 222 223 #include <dev/cons.h> 224 225 #if NSYSMON_ENVSYS > 0 || NSYSMON_POWER > 0 || NSYSMON_WDOG > 0 226 #include <dev/sysmon/sysmonvar.h> 227 #endif 228 229 #include <net/if.h> 230 #include <net/raw_cb.h> 231 232 #include <secmodel/secmodel.h> 233 234 extern struct proc proc0; 235 extern struct lwp lwp0; 236 extern struct cwdinfo cwdi0; 237 extern time_t rootfstime; 238 239 #ifndef curlwp 240 struct lwp *curlwp = &lwp0; 241 #endif 242 struct proc *initproc; 243 244 struct vnode *rootvp, *swapdev_vp; 245 int boothowto; 246 int cold = 1; /* still working on startup */ 247 struct timeval boottime; /* time at system startup - will only follow settime deltas */ 248 249 volatile int start_init_exec; /* semaphore for start_init() */ 250 251 static void check_console(struct lwp *l); 252 static void start_init(void *); 253 void main(void); 254 void ssp_init(void); 255 256 #if defined(__SSP__) || defined(__SSP_ALL__) 257 long __stack_chk_guard[8] = {0, 0, 0, 0, 0, 0, 0, 0}; 258 void __stack_chk_fail(void); 259 260 void 261 __stack_chk_fail(void) 262 { 263 panic("stack overflow detected; terminated"); 264 } 265 266 void 267 ssp_init(void) 268 { 269 int s; 270 271 #ifdef DIAGNOSTIC 272 printf("Initializing SSP:"); 273 #endif 274 /* 275 * We initialize ssp here carefully: 276 * 1. after we got some entropy 277 * 2. without calling a function 278 */ 279 size_t i; 280 long guard[__arraycount(__stack_chk_guard)]; 281 282 arc4randbytes(guard, sizeof(guard)); 283 s = splhigh(); 284 for (i = 0; i < __arraycount(guard); i++) 285 __stack_chk_guard[i] = guard[i]; 286 splx(s); 287 #ifdef DIAGNOSTIC 288 for (i = 0; i < __arraycount(guard); i++) 289 printf("%lx ", guard[i]); 290 printf("\n"); 291 #endif 292 } 293 #else 294 void 295 ssp_init(void) 296 { 297 298 } 299 #endif 300 301 void __secmodel_none(void); 302 __weak_alias(secmodel_start,__secmodel_none); 303 void 304 __secmodel_none(void) 305 { 306 return; 307 } 308 309 /* 310 * System startup; initialize the world, create process 0, mount root 311 * filesystem, and fork to create init and pagedaemon. Most of the 312 * hard work is done in the lower-level initialization routines including 313 * startup(), which does memory initialization and autoconfiguration. 314 */ 315 void 316 main(void) 317 { 318 struct timeval time; 319 struct lwp *l; 320 struct proc *p; 321 int s, error; 322 #ifdef NVNODE_IMPLICIT 323 int usevnodes; 324 #endif 325 CPU_INFO_ITERATOR cii; 326 struct cpu_info *ci; 327 328 l = &lwp0; 329 #ifndef LWP0_CPU_INFO 330 l->l_cpu = curcpu(); 331 #endif 332 333 /* 334 * Attempt to find console and initialize 335 * in case of early panic or other messages. 336 */ 337 consinit(); 338 339 kernel_lock_init(); 340 341 uvm_init(); 342 343 kmem_init(); 344 345 percpu_init(); 346 347 /* Initialize lock caches. */ 348 mutex_obj_init(); 349 350 /* Initialize the extent manager. */ 351 extent_init(); 352 353 /* Do machine-dependent initialization. */ 354 cpu_startup(); 355 356 /* Start module system. */ 357 module_init(); 358 359 /* Initialize callouts, part 1. */ 360 callout_startup(); 361 362 /* 363 * Initialize the kernel authorization subsystem and start the 364 * default security model, if any. We need to do this early 365 * enough so that subsystems relying on any of the aforementioned 366 * can work properly. Since the security model may dictate the 367 * credential inheritance policy, it is needed at least before 368 * any process is created, specifically proc0. 369 */ 370 kauth_init(); 371 secmodel_start(); 372 373 /* Initialize the buffer cache */ 374 bufinit(); 375 376 /* Initialize sockets. */ 377 soinit(); 378 379 /* 380 * The following things must be done before autoconfiguration. 381 */ 382 evcnt_init(); /* initialize event counters */ 383 #if NRND > 0 384 rnd_init(); /* initialize RNG */ 385 #endif 386 387 /* Initialize process and pgrp structures. */ 388 procinit(); 389 lwpinit(); 390 391 /* Initialize signal-related data structures. */ 392 signal_init(); 393 394 /* Initialize resource management. */ 395 resource_init(); 396 397 /* Create process 0 (the swapper). */ 398 proc0_init(); 399 400 /* Initialize the UID hash table. */ 401 uid_init(); 402 403 /* Charge root for one process. */ 404 (void)chgproccnt(0, 1); 405 406 /* Initialize timekeeping. */ 407 time_init(); 408 409 /* Initialize the run queues, turnstiles and sleep queues. */ 410 mutex_init(&cpu_lock, MUTEX_DEFAULT, IPL_NONE); 411 sched_rqinit(); 412 turnstile_init(); 413 sleeptab_init(&sleeptab); 414 415 /* Initialize processor-sets */ 416 psets_init(); 417 418 /* MI initialization of the boot cpu */ 419 error = mi_cpu_attach(curcpu()); 420 KASSERT(error == 0); 421 422 /* Initialize timekeeping, part 2. */ 423 time_init2(); 424 425 /* 426 * Initialize mbuf's. Do this now because we might attempt to 427 * allocate mbufs or mbuf clusters during autoconfiguration. 428 */ 429 mbinit(); 430 431 /* Initialize the sysctl subsystem. */ 432 sysctl_init(); 433 434 /* Initialize I/O statistics. */ 435 iostat_init(); 436 437 /* Initialize the log device. */ 438 loginit(); 439 440 /* Initialize the file systems. */ 441 #ifdef NVNODE_IMPLICIT 442 /* 443 * If maximum number of vnodes in namei vnode cache is not explicitly 444 * defined in kernel config, adjust the number such as we use roughly 445 * 1.0% of memory for vnode cache (but not less than NVNODE vnodes). 446 */ 447 usevnodes = 448 calc_cache_size(kernel_map, 1, VNODE_VA_MAXPCT) / sizeof(vnode_t); 449 if (usevnodes > desiredvnodes) 450 desiredvnodes = usevnodes; 451 #endif 452 vfsinit(); 453 454 /* Initialize fstrans. */ 455 fstrans_init(); 456 457 /* Initialize the file descriptor system. */ 458 fd_sys_init(); 459 460 /* Initialize kqueue. */ 461 kqueue_init(); 462 463 /* Initialize asynchronous I/O. */ 464 aio_sysinit(); 465 466 /* Initialize message queues. */ 467 mqueue_sysinit(); 468 469 /* Initialize the system monitor subsystems. */ 470 #if NSYSMON_TASKQ > 0 471 sysmon_task_queue_preinit(); 472 #endif 473 474 #if NSYSMON_ENVSYS > 0 475 sysmon_envsys_init(); 476 #endif 477 478 #if NSYSMON_POWER > 0 479 sysmon_power_init(); 480 #endif 481 482 #if NSYSMON_WDOG > 0 483 sysmon_wdog_init(); 484 #endif 485 486 inittimecounter(); 487 ntp_init(); 488 489 /* Initialize the device switch tables. */ 490 devsw_init(); 491 492 /* Initialize tty subsystem. */ 493 tty_init(); 494 ttyldisc_init(); 495 496 /* Initialize the buffer cache, part 2. */ 497 bufinit2(); 498 499 /* Initialize the disk wedge subsystem. */ 500 dkwedge_init(); 501 502 /* Configure the system hardware. This will enable interrupts. */ 503 configure(); 504 505 ubc_init(); /* must be after autoconfig */ 506 507 #ifdef SYSVSHM 508 /* Initialize System V style shared memory. */ 509 shminit(); 510 #endif 511 512 #ifdef SYSVSEM 513 /* Initialize System V style semaphores. */ 514 seminit(); 515 #endif 516 517 #ifdef SYSVMSG 518 /* Initialize System V style message queues. */ 519 msginit(); 520 #endif 521 522 #ifdef P1003_1B_SEMAPHORE 523 /* Initialize posix semaphores */ 524 ksem_init(); 525 #endif 526 527 #if NVERIEXEC > 0 528 /* 529 * Initialise the Veriexec subsystem. 530 */ 531 veriexec_init(); 532 #endif /* NVERIEXEC > 0 */ 533 534 #if defined(PAX_MPROTECT) || defined(PAX_SEGVGUARD) || defined(PAX_ASLR) 535 pax_init(); 536 #endif /* PAX_MPROTECT || PAX_SEGVGUARD || PAX_ASLR */ 537 538 #ifdef FAST_IPSEC 539 /* Attach network crypto subsystem */ 540 ipsec_attach(); 541 #endif 542 543 /* 544 * Initialize protocols. Block reception of incoming packets 545 * until everything is ready. 546 */ 547 s = splnet(); 548 ifinit(); 549 domaininit(); 550 if_attachdomain(); 551 splx(s); 552 553 #ifdef GPROF 554 /* Initialize kernel profiling. */ 555 kmstartup(); 556 #endif 557 558 /* Initialize system accounting. */ 559 acct_init(); 560 561 #ifndef PIPE_SOCKETPAIR 562 /* Initialize pipes. */ 563 pipe_init(); 564 #endif 565 566 #ifdef KTRACE 567 /* Initialize ktrace. */ 568 ktrinit(); 569 #endif 570 571 /* Initialize the UUID system calls. */ 572 uuid_init(); 573 574 /* 575 * Create process 1 (init(8)). We do this now, as Unix has 576 * historically had init be process 1, and changing this would 577 * probably upset a lot of people. 578 * 579 * Note that process 1 won't immediately exec init(8), but will 580 * wait for us to inform it that the root file system has been 581 * mounted. 582 */ 583 if (fork1(l, 0, SIGCHLD, NULL, 0, start_init, NULL, NULL, &initproc)) 584 panic("fork init"); 585 586 /* 587 * Load any remaining builtin modules, and hand back temporary 588 * storage to the VM system. 589 */ 590 module_init_class(MODULE_CLASS_ANY); 591 module_jettison(); 592 593 /* 594 * Finalize configuration now that all real devices have been 595 * found. This needs to be done before the root device is 596 * selected, since finalization may create the root device. 597 */ 598 config_finalize(); 599 600 /* 601 * Now that autoconfiguration has completed, we can determine 602 * the root and dump devices. 603 */ 604 cpu_rootconf(); 605 cpu_dumpconf(); 606 607 /* Mount the root file system. */ 608 do { 609 domountroothook(); 610 if ((error = vfs_mountroot())) { 611 printf("cannot mount root, error = %d\n", error); 612 boothowto |= RB_ASKNAME; 613 setroot(root_device, 614 (rootdev != NODEV) ? DISKPART(rootdev) : 0); 615 } 616 } while (error != 0); 617 mountroothook_destroy(); 618 619 /* 620 * Initialise the time-of-day clock, passing the time recorded 621 * in the root filesystem (if any) for use by systems that 622 * don't have a non-volatile time-of-day device. 623 */ 624 inittodr(rootfstime); 625 626 CIRCLEQ_FIRST(&mountlist)->mnt_flag |= MNT_ROOTFS; 627 CIRCLEQ_FIRST(&mountlist)->mnt_op->vfs_refcount++; 628 629 /* 630 * Get the vnode for '/'. Set filedesc0.fd_fd.fd_cdir to 631 * reference it. 632 */ 633 error = VFS_ROOT(CIRCLEQ_FIRST(&mountlist), &rootvnode); 634 if (error) 635 panic("cannot find root vnode, error=%d", error); 636 cwdi0.cwdi_cdir = rootvnode; 637 VREF(cwdi0.cwdi_cdir); 638 VOP_UNLOCK(rootvnode, 0); 639 cwdi0.cwdi_rdir = NULL; 640 641 /* 642 * Now that root is mounted, we can fixup initproc's CWD 643 * info. All other processes are kthreads, which merely 644 * share proc0's CWD info. 645 */ 646 initproc->p_cwdi->cwdi_cdir = rootvnode; 647 VREF(initproc->p_cwdi->cwdi_cdir); 648 initproc->p_cwdi->cwdi_rdir = NULL; 649 650 /* 651 * Now can look at time, having had a chance to verify the time 652 * from the file system. Reset l->l_rtime as it may have been 653 * munched in mi_switch() after the time got set. 654 */ 655 getmicrotime(&time); 656 boottime = time; 657 mutex_enter(proc_lock); 658 LIST_FOREACH(p, &allproc, p_list) { 659 KASSERT((p->p_flag & PK_MARKER) == 0); 660 mutex_enter(p->p_lock); 661 p->p_stats->p_start = time; 662 LIST_FOREACH(l, &p->p_lwps, l_sibling) { 663 lwp_lock(l); 664 memset(&l->l_rtime, 0, sizeof(l->l_rtime)); 665 lwp_unlock(l); 666 } 667 mutex_exit(p->p_lock); 668 } 669 mutex_exit(proc_lock); 670 binuptime(&curlwp->l_stime); 671 672 for (CPU_INFO_FOREACH(cii, ci)) { 673 ci->ci_schedstate.spc_lastmod = time_second; 674 } 675 676 /* Create the pageout daemon kernel thread. */ 677 uvm_swap_init(); 678 if (kthread_create(PRI_PGDAEMON, KTHREAD_MPSAFE, NULL, uvm_pageout, 679 NULL, NULL, "pgdaemon")) 680 panic("fork pagedaemon"); 681 682 /* Create the filesystem syncer kernel thread. */ 683 if (kthread_create(PRI_IOFLUSH, KTHREAD_MPSAFE, NULL, sched_sync, 684 NULL, NULL, "ioflush")) 685 panic("fork syncer"); 686 687 /* Create the aiodone daemon kernel thread. */ 688 if (workqueue_create(&uvm.aiodone_queue, "aiodoned", 689 uvm_aiodone_worker, NULL, PRI_VM, IPL_NONE, WQ_MPSAFE)) 690 panic("fork aiodoned"); 691 692 vmem_rehash_start(); 693 694 /* Initialize exec structures */ 695 exec_init(1); 696 697 /* 698 * Okay, now we can let init(8) exec! It's off to userland! 699 */ 700 start_init_exec = 1; 701 wakeup(&start_init_exec); 702 703 /* The scheduler is an infinite loop. */ 704 uvm_scheduler(); 705 /* NOTREACHED */ 706 } 707 708 static void 709 check_console(struct lwp *l) 710 { 711 struct nameidata nd; 712 int error; 713 714 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "/dev/console"); 715 error = namei(&nd); 716 if (error == 0) 717 vrele(nd.ni_vp); 718 else if (error == ENOENT) 719 printf("warning: no /dev/console\n"); 720 else 721 printf("warning: lookup /dev/console: error %d\n", error); 722 } 723 724 /* 725 * List of paths to try when searching for "init". 726 */ 727 static const char * const initpaths[] = { 728 "/sbin/init", 729 "/sbin/oinit", 730 "/sbin/init.bak", 731 NULL, 732 }; 733 734 /* 735 * Start the initial user process; try exec'ing each pathname in "initpaths". 736 * The program is invoked with one argument containing the boot flags. 737 */ 738 static void 739 start_init(void *arg) 740 { 741 struct lwp *l = arg; 742 struct proc *p = l->l_proc; 743 vaddr_t addr; 744 struct sys_execve_args /* { 745 syscallarg(const char *) path; 746 syscallarg(char * const *) argp; 747 syscallarg(char * const *) envp; 748 } */ args; 749 int options, i, error; 750 register_t retval[2]; 751 char flags[4], *flagsp; 752 const char *path, *slash; 753 char *ucp, **uap, *arg0, *arg1 = NULL; 754 char ipath[129]; 755 int ipx, len; 756 757 /* 758 * Now in process 1. 759 */ 760 strncpy(p->p_comm, "init", MAXCOMLEN); 761 762 /* 763 * Wait for main() to tell us that it's safe to exec. 764 */ 765 while (start_init_exec == 0) 766 (void) tsleep(&start_init_exec, PWAIT, "initexec", 0); 767 768 /* 769 * This is not the right way to do this. We really should 770 * hand-craft a descriptor onto /dev/console to hand to init, 771 * but that's a _lot_ more work, and the benefit from this easy 772 * hack makes up for the "good is the enemy of the best" effect. 773 */ 774 check_console(l); 775 776 /* 777 * Need just enough stack to hold the faked-up "execve()" arguments. 778 */ 779 addr = (vaddr_t)STACK_ALLOC(USRSTACK, PAGE_SIZE); 780 if (uvm_map(&p->p_vmspace->vm_map, &addr, PAGE_SIZE, 781 NULL, UVM_UNKNOWN_OFFSET, 0, 782 UVM_MAPFLAG(UVM_PROT_ALL, UVM_PROT_ALL, UVM_INH_COPY, 783 UVM_ADV_NORMAL, 784 UVM_FLAG_FIXED|UVM_FLAG_OVERLAY|UVM_FLAG_COPYONW)) != 0) 785 panic("init: couldn't allocate argument space"); 786 p->p_vmspace->vm_maxsaddr = (void *)STACK_MAX(addr, PAGE_SIZE); 787 788 ipx = 0; 789 while (1) { 790 if (boothowto & RB_ASKNAME) { 791 printf("init path"); 792 if (initpaths[ipx]) 793 printf(" (default %s)", initpaths[ipx]); 794 printf(": "); 795 len = cngetsn(ipath, sizeof(ipath)-1); 796 if (len == 0) { 797 if (initpaths[ipx]) 798 path = initpaths[ipx++]; 799 else 800 continue; 801 } else { 802 ipath[len] = '\0'; 803 path = ipath; 804 } 805 } else { 806 if ((path = initpaths[ipx++]) == NULL) 807 break; 808 } 809 810 ucp = (char *)USRSTACK; 811 812 /* 813 * Construct the boot flag argument. 814 */ 815 flagsp = flags; 816 *flagsp++ = '-'; 817 options = 0; 818 819 if (boothowto & RB_SINGLE) { 820 *flagsp++ = 's'; 821 options = 1; 822 } 823 #ifdef notyet 824 if (boothowto & RB_FASTBOOT) { 825 *flagsp++ = 'f'; 826 options = 1; 827 } 828 #endif 829 830 /* 831 * Move out the flags (arg 1), if necessary. 832 */ 833 if (options != 0) { 834 *flagsp++ = '\0'; 835 i = flagsp - flags; 836 #ifdef DEBUG 837 printf("init: copying out flags `%s' %d\n", flags, i); 838 #endif 839 arg1 = STACK_ALLOC(ucp, i); 840 ucp = STACK_MAX(arg1, i); 841 (void)copyout((void *)flags, arg1, i); 842 } 843 844 /* 845 * Move out the file name (also arg 0). 846 */ 847 i = strlen(path) + 1; 848 #ifdef DEBUG 849 printf("init: copying out path `%s' %d\n", path, i); 850 #else 851 if (boothowto & RB_ASKNAME || path != initpaths[0]) 852 printf("init: trying %s\n", path); 853 #endif 854 arg0 = STACK_ALLOC(ucp, i); 855 ucp = STACK_MAX(arg0, i); 856 (void)copyout(path, arg0, i); 857 858 /* 859 * Move out the arg pointers. 860 */ 861 ucp = (void *)STACK_ALIGN(ucp, ALIGNBYTES); 862 uap = (char **)STACK_ALLOC(ucp, sizeof(char *) * 3); 863 SCARG(&args, path) = arg0; 864 SCARG(&args, argp) = uap; 865 SCARG(&args, envp) = NULL; 866 slash = strrchr(path, '/'); 867 if (slash) 868 (void)suword((void *)uap++, 869 (long)arg0 + (slash + 1 - path)); 870 else 871 (void)suword((void *)uap++, (long)arg0); 872 if (options != 0) 873 (void)suword((void *)uap++, (long)arg1); 874 (void)suword((void *)uap++, 0); /* terminator */ 875 876 /* 877 * Now try to exec the program. If can't for any reason 878 * other than it doesn't exist, complain. 879 */ 880 error = sys_execve(l, &args, retval); 881 if (error == 0 || error == EJUSTRETURN) { 882 KERNEL_UNLOCK_LAST(l); 883 return; 884 } 885 printf("exec %s: error %d\n", path, error); 886 } 887 printf("init: not found\n"); 888 panic("no init"); 889 } 890 891 /* 892 * calculate cache size from physmem and vm_map size. 893 */ 894 vaddr_t 895 calc_cache_size(struct vm_map *map, int pct, int va_pct) 896 { 897 paddr_t t; 898 899 /* XXX should consider competing cache if any */ 900 /* XXX should consider submaps */ 901 t = (uintmax_t)physmem * pct / 100 * PAGE_SIZE; 902 if (map != NULL) { 903 vsize_t vsize; 904 905 vsize = vm_map_max(map) - vm_map_min(map); 906 vsize = (uintmax_t)vsize * va_pct / 100; 907 if (t > vsize) { 908 t = vsize; 909 } 910 } 911 return t; 912 } 913
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